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gecko-dev/dom/base/nsContentUtils.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* A namespace class for static layout utilities. */
#include "nsContentUtils.h"
#include <algorithm>
#include <math.h>
#include "DecoderTraits.h"
#include "harfbuzz/hb.h"
#include "imgICache.h"
#include "imgIContainer.h"
#include "imgINotificationObserver.h"
#include "imgLoader.h"
#include "imgRequestProxy.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/JSON.h"
#include "js/Value.h"
#include "Layers.h"
#include "nsAppRunner.h"
// nsNPAPIPluginInstance must be included before nsIDocument.h, which is included in mozAutoDocUpdate.h.
#include "nsNPAPIPluginInstance.h"
#include "gfxDrawable.h"
#include "gfxPrefs.h"
#include "ImageOps.h"
#include "mozAutoDocUpdate.h"
#include "mozilla/AntiTrackingCommon.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/AutoTimelineMarker.h"
#include "mozilla/BackgroundHangMonitor.h"
#include "mozilla/Base64.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/LoadInfo.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/MessageBroadcaster.h"
#include "mozilla/dom/DocumentFragment.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/DOMExceptionBinding.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/FileSystemSecurity.h"
#include "mozilla/dom/FileBlobImpl.h"
#include "mozilla/dom/FontTableURIProtocolHandler.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/HTMLSlotElement.h"
#include "mozilla/dom/HTMLTemplateElement.h"
#include "mozilla/dom/IDTracker.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/KeyboardEventBinding.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/NodeBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/XULCommandEvent.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/gfx/DataSurfaceHelpers.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/Likely.h"
#include "mozilla/ManualNAC.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPrefs.h"
#include "mozilla/TextEvents.h"
#include "nsArrayUtils.h"
#include "nsAString.h"
#include "nsAttrName.h"
#include "nsAttrValue.h"
#include "nsAttrValueInlines.h"
#include "nsBindingManager.h"
#include "nsCanvasFrame.h"
#include "nsCaret.h"
#include "nsCCUncollectableMarker.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsCOMPtr.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentDLF.h"
#include "nsContentList.h"
#include "nsContentPolicyUtils.h"
#include "nsContentSecurityManager.h"
#include "nsCPrefetchService.h"
#include "nsCRT.h"
#include "nsCycleCollectionParticipant.h"
#include "nsCycleCollector.h"
#include "nsDataHashtable.h"
#include "nsDocShellCID.h"
#include "nsDocument.h"
#include "nsDOMCID.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsDOMJSUtils.h"
#include "nsDOMMutationObserver.h"
#include "nsError.h"
#include "nsFocusManager.h"
#include "nsGenericHTMLElement.h"
#include "nsGenericHTMLFrameElement.h"
#include "nsGkAtoms.h"
#include "nsHtml5Module.h"
#include "nsHtml5StringParser.h"
#include "nsHTMLDocument.h"
#include "nsHTMLTags.h"
#include "nsIAddonPolicyService.h"
#include "nsIAnonymousContentCreator.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsICategoryManager.h"
#include "nsIChannelEventSink.h"
#include "nsICharsetDetectionObserver.h"
#include "nsIChromeRegistry.h"
#include "nsIConsoleService.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIContentSink.h"
#include "nsIContentViewer.h"
#include "nsIDocShell.h"
#include "nsIDocShellTreeOwner.h"
#include "nsIDocument.h"
#include "nsIDocumentEncoder.h"
#include "nsIDOMChromeWindow.h"
#include "nsIDOMWindowUtils.h"
#include "nsIDragService.h"
#include "nsIFormControl.h"
#include "nsIForm.h"
#include "nsIFragmentContentSink.h"
#include "nsContainerFrame.h"
#include "nsIHTMLDocument.h"
#include "nsIIdleService.h"
#include "nsIImageLoadingContent.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIIOService.h"
#include "nsILoadContext.h"
#include "nsILoadGroup.h"
#include "nsIMemoryReporter.h"
#include "nsIMIMEHeaderParam.h"
#include "nsIMIMEService.h"
#include "nsINode.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/NullPrincipal.h"
#include "nsIObjectLoadingContent.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsIOfflineCacheUpdate.h"
#include "nsIParser.h"
#include "nsIParserUtils.h"
#include "nsIPermissionManager.h"
#include "nsIPluginHost.h"
#include "nsIRequest.h"
#include "nsIRunnable.h"
#include "nsIScriptContext.h"
#include "nsIScriptError.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptSecurityManager.h"
#include "nsIScrollable.h"
#include "nsIStreamConverter.h"
#include "nsIStreamConverterService.h"
#include "nsIStringBundle.h"
#include "nsIURI.h"
#include "nsIURIWithSpecialOrigin.h"
#include "nsIURL.h"
#include "nsIWebNavigation.h"
#include "nsIWindowMediator.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
#include "nsMappedAttributes.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsNodeInfoManager.h"
#include "nsParserCIID.h"
#include "nsParserConstants.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsPrintfCString.h"
#include "nsSandboxFlags.h"
#include "nsScriptSecurityManager.h"
#include "nsSerializationHelper.h"
#include "nsStreamUtils.h"
#include "nsTextEditorState.h"
#include "nsTextFragment.h"
#include "nsTextNode.h"
#include "nsThreadUtils.h"
#include "nsTreeSanitizer.h"
#include "nsUnicodeProperties.h"
#include "nsURLHelper.h"
#include "nsViewManager.h"
#include "nsViewportInfo.h"
#include "nsWidgetsCID.h"
#include "nsIWindowProvider.h"
#include "nsWrapperCacheInlines.h"
#include "nsXULPopupManager.h"
#include "xpcprivate.h" // nsXPConnect
#include "HTMLSplitOnSpacesTokenizer.h"
#include "InProcessTabChildMessageManager.h"
#include "nsContentTypeParser.h"
#include "nsICookiePermission.h"
#include "nsICookieService.h"
#include "mozIThirdPartyUtil.h"
#include "mozilla/EnumSet.h"
#include "mozilla/BloomFilter.h"
#include "TabChild.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/TabGroup.h"
#include "nsIWebNavigationInfo.h"
#include "nsPluginHost.h"
#include "nsIBrowser.h"
#include "mozilla/HangAnnotations.h"
#include "mozilla/Encoding.h"
#include "nsXULElement.h"
#include "nsIBidiKeyboard.h"
#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#undef LoadImage
#endif
extern "C" int MOZ_XMLTranslateEntity(const char* ptr, const char* end,
const char** next, char16_t* result);
extern "C" int MOZ_XMLCheckQName(const char* ptr, const char* end,
int ns_aware, const char** colon);
class imgLoader;
class nsAtom;
using namespace mozilla::dom;
using namespace mozilla::ipc;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::widget;
using namespace mozilla;
const char kLoadAsData[] = "loadAsData";
nsIXPConnect *nsContentUtils::sXPConnect;
nsIScriptSecurityManager *nsContentUtils::sSecurityManager;
nsIPrincipal *nsContentUtils::sSystemPrincipal;
nsIPrincipal *nsContentUtils::sNullSubjectPrincipal;
nsNameSpaceManager *nsContentUtils::sNameSpaceManager;
nsIIOService *nsContentUtils::sIOService;
nsIUUIDGenerator *nsContentUtils::sUUIDGenerator;
nsIConsoleService *nsContentUtils::sConsoleService;
nsDataHashtable<nsRefPtrHashKey<nsAtom>, EventNameMapping>* nsContentUtils::sAtomEventTable = nullptr;
nsDataHashtable<nsStringHashKey, EventNameMapping>* nsContentUtils::sStringEventTable = nullptr;
nsTArray<RefPtr<nsAtom>>* nsContentUtils::sUserDefinedEvents = nullptr;
nsIStringBundleService *nsContentUtils::sStringBundleService;
nsIStringBundle *nsContentUtils::sStringBundles[PropertiesFile_COUNT];
nsIContentPolicy *nsContentUtils::sContentPolicyService;
bool nsContentUtils::sTriedToGetContentPolicy = false;
RefPtr<mozilla::intl::LineBreaker> nsContentUtils::sLineBreaker;
RefPtr<mozilla::intl::WordBreaker> nsContentUtils::sWordBreaker;
nsIBidiKeyboard *nsContentUtils::sBidiKeyboard = nullptr;
uint32_t nsContentUtils::sScriptBlockerCount = 0;
uint32_t nsContentUtils::sDOMNodeRemovedSuppressCount = 0;
AutoTArray<nsCOMPtr<nsIRunnable>, 8>* nsContentUtils::sBlockedScriptRunners = nullptr;
uint32_t nsContentUtils::sRunnersCountAtFirstBlocker = 0;
nsIInterfaceRequestor* nsContentUtils::sSameOriginChecker = nullptr;
bool nsContentUtils::sIsHandlingKeyBoardEvent = false;
bool nsContentUtils::sAllowXULXBL_for_file = false;
bool nsContentUtils::sDisablePopups = false;
nsString* nsContentUtils::sShiftText = nullptr;
nsString* nsContentUtils::sControlText = nullptr;
nsString* nsContentUtils::sMetaText = nullptr;
nsString* nsContentUtils::sOSText = nullptr;
nsString* nsContentUtils::sAltText = nullptr;
nsString* nsContentUtils::sModifierSeparator = nullptr;
bool nsContentUtils::sInitialized = false;
bool nsContentUtils::sIsFullScreenApiEnabled = false;
bool nsContentUtils::sIsUnprefixedFullscreenApiEnabled = false;
bool nsContentUtils::sTrustedFullScreenOnly = true;
bool nsContentUtils::sIsCutCopyAllowed = true;
bool nsContentUtils::sIsUpgradableDisplayContentPrefEnabled = false;
bool nsContentUtils::sIsFrameTimingPrefEnabled = false;
bool nsContentUtils::sIsPerformanceTimingEnabled = false;
bool nsContentUtils::sIsResourceTimingEnabled = false;
bool nsContentUtils::sIsPerformanceNavigationTimingEnabled = false;
bool nsContentUtils::sIsFormAutofillAutocompleteEnabled = false;
bool nsContentUtils::sIsUAWidgetEnabled = false;
bool nsContentUtils::sIsShadowDOMEnabled = false;
bool nsContentUtils::sIsCustomElementsEnabled = false;
bool nsContentUtils::sSendPerformanceTimingNotifications = false;
bool nsContentUtils::sUseActivityCursor = false;
bool nsContentUtils::sAnimationsAPICoreEnabled = false;
bool nsContentUtils::sGetBoxQuadsEnabled = false;
bool nsContentUtils::sSkipCursorMoveForSameValueSet = false;
bool nsContentUtils::sRequestIdleCallbackEnabled = false;
bool nsContentUtils::sLowerNetworkPriority = false;
bool nsContentUtils::sTailingEnabled = false;
bool nsContentUtils::sShowInputPlaceholderOnFocus = true;
bool nsContentUtils::sAutoFocusEnabled = true;
#ifndef RELEASE_OR_BETA
bool nsContentUtils::sBypassCSSOMOriginCheck = false;
#endif
bool nsContentUtils::sIsBytecodeCacheEnabled = false;
int32_t nsContentUtils::sBytecodeCacheStrategy = 0;
nsCString* nsContentUtils::sJSBytecodeMimeType = nullptr;
int32_t nsContentUtils::sPrivacyMaxInnerWidth = 1000;
int32_t nsContentUtils::sPrivacyMaxInnerHeight = 1000;
nsContentUtils::UserInteractionObserver*
nsContentUtils::sUserInteractionObserver = nullptr;
uint32_t nsContentUtils::sHandlingInputTimeout = 1000;
uint32_t nsContentUtils::sCookiesLifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
nsHtml5StringParser* nsContentUtils::sHTMLFragmentParser = nullptr;
nsIParser* nsContentUtils::sXMLFragmentParser = nullptr;
nsIFragmentContentSink* nsContentUtils::sXMLFragmentSink = nullptr;
bool nsContentUtils::sFragmentParsingActive = false;
bool nsContentUtils::sDoNotTrackEnabled = false;
bool nsContentUtils::sAntiTrackingControlCenterUIEnabled = false;
mozilla::LazyLogModule nsContentUtils::sDOMDumpLog("Dump");
PopupControlState nsContentUtils::sPopupControlState = openAbused;
int32_t nsContentUtils::sInnerOrOuterWindowCount = 0;
uint32_t nsContentUtils::sInnerOrOuterWindowSerialCounter = 0;
// Subset of http://www.whatwg.org/specs/web-apps/current-work/#autofill-field-name
enum AutocompleteUnsupportedFieldName : uint8_t
{
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \
eAutocompleteUnsupportedFieldName_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME
};
enum AutocompleteUnsupportFieldContactHint : uint8_t
{
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \
eAutocompleteUnsupportedFieldContactHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT
};
enum AutocompleteFieldName : uint8_t
{
#define AUTOCOMPLETE_FIELD_NAME(name_, value_) \
eAutocompleteFieldName_##name_,
#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \
AUTOCOMPLETE_FIELD_NAME(name_, value_)
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_NAME
#undef AUTOCOMPLETE_CONTACT_FIELD_NAME
};
enum AutocompleteFieldHint : uint8_t
{
#define AUTOCOMPLETE_FIELD_HINT(name_, value_) \
eAutocompleteFieldHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_HINT
};
enum AutocompleteFieldContactHint : uint8_t
{
#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \
eAutocompleteFieldContactHint_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_CONTACT_HINT
};
enum AutocompleteCategory
{
#define AUTOCOMPLETE_CATEGORY(name_, value_) eAutocompleteCategory_##name_,
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CATEGORY
};
static const nsAttrValue::EnumTable kAutocompleteUnsupportedFieldNameTable[] = {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME(name_, value_) \
{ value_, eAutocompleteUnsupportedFieldName_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_NAME
{ nullptr, 0 }
};
static const nsAttrValue::EnumTable kAutocompleteUnsupportedContactFieldHintTable[] = {
#define AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT(name_, value_) \
{ value_, eAutocompleteUnsupportedFieldContactHint_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_UNSUPPORTED_FIELD_CONTACT_HINT
{ nullptr, 0 }
};
static const nsAttrValue::EnumTable kAutocompleteFieldNameTable[] = {
#define AUTOCOMPLETE_FIELD_NAME(name_, value_) \
{ value_, eAutocompleteFieldName_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_NAME
{ nullptr, 0 }
};
static const nsAttrValue::EnumTable kAutocompleteContactFieldNameTable[] = {
#define AUTOCOMPLETE_CONTACT_FIELD_NAME(name_, value_) \
{ value_, eAutocompleteFieldName_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_CONTACT_FIELD_NAME
{ nullptr, 0 }
};
static const nsAttrValue::EnumTable kAutocompleteFieldHintTable[] = {
#define AUTOCOMPLETE_FIELD_HINT(name_, value_) \
{ value_, eAutocompleteFieldHint_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_HINT
{ nullptr, 0 }
};
static const nsAttrValue::EnumTable kAutocompleteContactFieldHintTable[] = {
#define AUTOCOMPLETE_FIELD_CONTACT_HINT(name_, value_) \
{ value_, eAutocompleteFieldContactHint_##name_ },
#include "AutocompleteFieldList.h"
#undef AUTOCOMPLETE_FIELD_CONTACT_HINT
{ nullptr, 0 }
};
namespace {
static NS_DEFINE_CID(kCParserCID, NS_PARSER_CID);
static PLDHashTable* sEventListenerManagersHash;
class DOMEventListenerManagersHashReporter final : public nsIMemoryReporter
{
MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
~DOMEventListenerManagersHashReporter() = default;
public:
NS_DECL_ISUPPORTS
NS_IMETHOD CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) override
{
// We don't measure the |EventListenerManager| objects pointed to by the
// entries because those references are non-owning.
int64_t amount = sEventListenerManagersHash
? sEventListenerManagersHash->ShallowSizeOfIncludingThis(
MallocSizeOf)
: 0;
MOZ_COLLECT_REPORT(
"explicit/dom/event-listener-managers-hash", KIND_HEAP, UNITS_BYTES,
amount,
"Memory used by the event listener manager's hash table.");
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(DOMEventListenerManagersHashReporter, nsIMemoryReporter)
class EventListenerManagerMapEntry : public PLDHashEntryHdr
{
public:
explicit EventListenerManagerMapEntry(const void* aKey)
: mKey(aKey)
{
}
~EventListenerManagerMapEntry()
{
NS_ASSERTION(!mListenerManager, "caller must release and disconnect ELM");
}
protected: // declared protected to silence clang warnings
const void *mKey; // must be first, to look like PLDHashEntryStub
public:
RefPtr<EventListenerManager> mListenerManager;
};
static void
EventListenerManagerHashInitEntry(PLDHashEntryHdr *entry, const void *key)
{
// Initialize the entry with placement new
new (entry) EventListenerManagerMapEntry(key);
}
static void
EventListenerManagerHashClearEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
{
EventListenerManagerMapEntry *lm =
static_cast<EventListenerManagerMapEntry *>(entry);
// Let the EventListenerManagerMapEntry clean itself up...
lm->~EventListenerManagerMapEntry();
}
class SameOriginCheckerImpl final : public nsIChannelEventSink,
public nsIInterfaceRequestor
{
~SameOriginCheckerImpl() = default;
NS_DECL_ISUPPORTS
NS_DECL_NSICHANNELEVENTSINK
NS_DECL_NSIINTERFACEREQUESTOR
};
} // namespace
/**
* This class is used to determine whether or not the user is currently
* interacting with the browser. It listens to observer events to toggle the
* value of the sUserActive static.
*
* This class is an internal implementation detail.
* nsContentUtils::GetUserIsInteracting() should be used to access current
* user interaction status.
*/
class nsContentUtils::UserInteractionObserver final : public nsIObserver
, public BackgroundHangAnnotator
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
void Init();
void Shutdown();
void AnnotateHang(BackgroundHangAnnotations& aAnnotations) override;
static Atomic<bool> sUserActive;
private:
~UserInteractionObserver() {}
};
/* static */
TimeDuration
nsContentUtils::HandlingUserInputTimeout()
{
return TimeDuration::FromMilliseconds(sHandlingInputTimeout);
}
// static
nsresult
nsContentUtils::Init()
{
if (sInitialized) {
NS_WARNING("Init() called twice");
return NS_OK;
}
nsHTMLTags::AddRefTable();
sNameSpaceManager = nsNameSpaceManager::GetInstance();
NS_ENSURE_TRUE(sNameSpaceManager, NS_ERROR_OUT_OF_MEMORY);
sXPConnect = nsXPConnect::XPConnect();
// We hold a strong ref to sXPConnect to ensure that it does not go away until
// nsLayoutStatics::Shutdown is happening. Otherwise ~nsXPConnect can be
// triggered by xpcModuleDtor late in shutdown and cause crashes due to
// various stuff already being torn down by then. Note that this means that
// we are effectively making sure that if we leak nsLayoutStatics then we also
// leak nsXPConnect.
NS_ADDREF(sXPConnect);
sSecurityManager = nsScriptSecurityManager::GetScriptSecurityManager();
if(!sSecurityManager)
return NS_ERROR_FAILURE;
NS_ADDREF(sSecurityManager);
sSecurityManager->GetSystemPrincipal(&sSystemPrincipal);
MOZ_ASSERT(sSystemPrincipal);
RefPtr<NullPrincipal> nullPrincipal = NullPrincipal::CreateWithoutOriginAttributes();
if (!nullPrincipal) {
return NS_ERROR_FAILURE;
}
nullPrincipal.forget(&sNullSubjectPrincipal);
nsresult rv = CallGetService(NS_IOSERVICE_CONTRACTID, &sIOService);
if (NS_FAILED(rv)) {
// This makes life easier, but we can live without it.
sIOService = nullptr;
}
sLineBreaker = mozilla::intl::LineBreaker::Create();
sWordBreaker = mozilla::intl::WordBreaker::Create();
if (!InitializeEventTable())
return NS_ERROR_FAILURE;
if (!sEventListenerManagersHash) {
static const PLDHashTableOps hash_table_ops =
{
PLDHashTable::HashVoidPtrKeyStub,
PLDHashTable::MatchEntryStub,
PLDHashTable::MoveEntryStub,
EventListenerManagerHashClearEntry,
EventListenerManagerHashInitEntry
};
sEventListenerManagersHash =
new PLDHashTable(&hash_table_ops, sizeof(EventListenerManagerMapEntry));
RegisterStrongMemoryReporter(new DOMEventListenerManagersHashReporter());
}
sBlockedScriptRunners = new AutoTArray<nsCOMPtr<nsIRunnable>, 8>;
Preferences::AddBoolVarCache(&sAllowXULXBL_for_file,
"dom.allow_XUL_XBL_for_file");
Preferences::AddBoolVarCache(&sIsFullScreenApiEnabled,
"full-screen-api.enabled");
Preferences::AddBoolVarCache(&sIsUnprefixedFullscreenApiEnabled,
"full-screen-api.unprefix.enabled");
Preferences::AddBoolVarCache(&sTrustedFullScreenOnly,
"full-screen-api.allow-trusted-requests-only");
Preferences::AddBoolVarCache(&sIsCutCopyAllowed,
"dom.allow_cut_copy", true);
Preferences::AddBoolVarCache(&sIsPerformanceTimingEnabled,
"dom.enable_performance", true);
Preferences::AddBoolVarCache(&sIsResourceTimingEnabled,
"dom.enable_resource_timing", true);
Preferences::AddBoolVarCache(&sIsPerformanceNavigationTimingEnabled,
"dom.enable_performance_navigation_timing", true);
Preferences::AddBoolVarCache(&sIsUpgradableDisplayContentPrefEnabled,
"security.mixed_content.upgrade_display_content", false);
Preferences::AddBoolVarCache(&sIsFrameTimingPrefEnabled,
"dom.enable_frame_timing", false);
Preferences::AddBoolVarCache(&sIsFormAutofillAutocompleteEnabled,
"dom.forms.autocomplete.formautofill", false);
Preferences::AddBoolVarCache(&sIsUAWidgetEnabled,
"dom.ua_widget.enabled", false);
Preferences::AddBoolVarCache(&sIsShadowDOMEnabled,
"dom.webcomponents.shadowdom.enabled", false);
Preferences::AddBoolVarCache(&sIsCustomElementsEnabled,
"dom.webcomponents.customelements.enabled", false);
Preferences::AddIntVarCache(&sPrivacyMaxInnerWidth,
"privacy.window.maxInnerWidth",
1000);
Preferences::AddIntVarCache(&sPrivacyMaxInnerHeight,
"privacy.window.maxInnerHeight",
1000);
Preferences::AddUintVarCache(&sHandlingInputTimeout,
"dom.event.handling-user-input-time-limit",
1000);
Preferences::AddBoolVarCache(&sSendPerformanceTimingNotifications,
"dom.performance.enable_notify_performance_timing", false);
Preferences::AddUintVarCache(&sCookiesLifetimePolicy,
"network.cookie.lifetimePolicy",
nsICookieService::ACCEPT_NORMALLY);
Preferences::AddBoolVarCache(&sDoNotTrackEnabled,
"privacy.donottrackheader.enabled", false);
Preferences::AddBoolVarCache(&sUseActivityCursor,
"ui.use_activity_cursor", false);
Preferences::AddBoolVarCache(&sAnimationsAPICoreEnabled,
"dom.animations-api.core.enabled", false);
Preferences::AddBoolVarCache(&sGetBoxQuadsEnabled,
"layout.css.getBoxQuads.enabled", false);
Preferences::AddBoolVarCache(&sSkipCursorMoveForSameValueSet,
"dom.input.skip_cursor_move_for_same_value_set",
true);
Preferences::AddBoolVarCache(&sRequestIdleCallbackEnabled,
"dom.requestIdleCallback.enabled", false);
#ifndef RELEASE_OR_BETA
sBypassCSSOMOriginCheck = getenv("MOZ_BYPASS_CSSOM_ORIGIN_CHECK");
#endif
Preferences::AddBoolVarCache(&sLowerNetworkPriority,
"privacy.trackingprotection.lower_network_priority", false);
Preferences::AddBoolVarCache(&sTailingEnabled,
"network.http.tailing.enabled", true);
Preferences::AddBoolVarCache(&sShowInputPlaceholderOnFocus,
"dom.placeholder.show_on_focus", true);
Preferences::AddBoolVarCache(&sAutoFocusEnabled,
"browser.autofocus", true);
Preferences::AddBoolVarCache(&sIsBytecodeCacheEnabled,
"dom.script_loader.bytecode_cache.enabled", false);
Preferences::AddBoolVarCache(&sDisablePopups,
"dom.disable_open_during_load", false);
Preferences::AddBoolVarCache(&sAntiTrackingControlCenterUIEnabled,
"browser.contentblocking.rejecttrackers.control-center.ui.enabled", false);
Preferences::AddIntVarCache(&sBytecodeCacheStrategy,
"dom.script_loader.bytecode_cache.strategy", 0);
nsDependentCString buildID(mozilla::PlatformBuildID());
sJSBytecodeMimeType = new nsCString(NS_LITERAL_CSTRING("javascript/moz-bytecode-") + buildID);
Element::InitCCCallbacks();
Unused << nsRFPService::GetOrCreate();
nsCOMPtr<nsIUUIDGenerator> uuidGenerator =
do_GetService("@mozilla.org/uuid-generator;1", &rv);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
uuidGenerator.forget(&sUUIDGenerator);
if (XRE_IsParentProcess()) {
AsyncPrecreateStringBundles();
}
RefPtr<UserInteractionObserver> uio = new UserInteractionObserver();
uio->Init();
uio.forget(&sUserInteractionObserver);
sInitialized = true;
return NS_OK;
}
nsresult nsContentUtils::RemoveWyciwygScheme(nsIURI* aURI, nsIURI** aReturn)
{
#ifdef DEBUG
bool isWyciwyg = false;
aURI->SchemeIs("wyciwyg", &isWyciwyg);
MOZ_ASSERT(isWyciwyg, "Scheme should be wyciwyg");
#endif
nsAutoCString path;
nsresult rv = aURI->GetPathQueryRef(path);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t pathLength = path.Length();
if (pathLength <= 2) {
return NS_ERROR_FAILURE;
}
// Path is of the form "//123/http://foo/bar", with a variable number of
// digits. To figure out where the "real" URL starts, search path for a '/',
// starting at the third character.
int32_t slashIndex = path.FindChar('/', 2);
if (slashIndex == kNotFound) {
return NS_ERROR_FAILURE;
}
return NS_NewURI(aReturn,
Substring(path, slashIndex + 1, pathLength - slashIndex - 1));
}
void
nsContentUtils::GetShiftText(nsAString& text)
{
if (!sShiftText)
InitializeModifierStrings();
text.Assign(*sShiftText);
}
void
nsContentUtils::GetControlText(nsAString& text)
{
if (!sControlText)
InitializeModifierStrings();
text.Assign(*sControlText);
}
void
nsContentUtils::GetMetaText(nsAString& text)
{
if (!sMetaText)
InitializeModifierStrings();
text.Assign(*sMetaText);
}
void
nsContentUtils::GetOSText(nsAString& text)
{
if (!sOSText) {
InitializeModifierStrings();
}
text.Assign(*sOSText);
}
void
nsContentUtils::GetAltText(nsAString& text)
{
if (!sAltText)
InitializeModifierStrings();
text.Assign(*sAltText);
}
void
nsContentUtils::GetModifierSeparatorText(nsAString& text)
{
if (!sModifierSeparator)
InitializeModifierStrings();
text.Assign(*sModifierSeparator);
}
void
nsContentUtils::InitializeModifierStrings()
{
//load the display strings for the keyboard accelerators
nsCOMPtr<nsIStringBundleService> bundleService =
mozilla::services::GetStringBundleService();
nsCOMPtr<nsIStringBundle> bundle;
DebugOnly<nsresult> rv = NS_OK;
if (bundleService) {
rv = bundleService->CreateBundle( "chrome://global-platform/locale/platformKeys.properties",
getter_AddRefs(bundle));
}
NS_ASSERTION(NS_SUCCEEDED(rv) && bundle, "chrome://global/locale/platformKeys.properties could not be loaded");
nsAutoString shiftModifier;
nsAutoString metaModifier;
nsAutoString osModifier;
nsAutoString altModifier;
nsAutoString controlModifier;
nsAutoString modifierSeparator;
if (bundle) {
//macs use symbols for each modifier key, so fetch each from the bundle, which also covers i18n
bundle->GetStringFromName("VK_SHIFT", shiftModifier);
bundle->GetStringFromName("VK_META", metaModifier);
bundle->GetStringFromName("VK_WIN", osModifier);
bundle->GetStringFromName("VK_ALT", altModifier);
bundle->GetStringFromName("VK_CONTROL", controlModifier);
bundle->GetStringFromName("MODIFIER_SEPARATOR", modifierSeparator);
}
//if any of these don't exist, we get an empty string
sShiftText = new nsString(shiftModifier);
sMetaText = new nsString(metaModifier);
sOSText = new nsString(osModifier);
sAltText = new nsString(altModifier);
sControlText = new nsString(controlModifier);
sModifierSeparator = new nsString(modifierSeparator);
}
mozilla::EventClassID
nsContentUtils::GetEventClassIDFromMessage(EventMessage aEventMessage)
{
switch (aEventMessage) {
#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \
case message_: return struct_;
#include "mozilla/EventNameList.h"
#undef MESSAGE_TO_EVENT
default:
MOZ_ASSERT_UNREACHABLE("Invalid event message?");
return eBasicEventClass;
}
}
static nsAtom*
GetEventTypeFromMessage(EventMessage aEventMessage)
{
switch (aEventMessage) {
#define MESSAGE_TO_EVENT(name_, message_, type_, struct_) \
case message_: return nsGkAtoms::on##name_;
#include "mozilla/EventNameList.h"
#undef MESSAGE_TO_EVENT
default:
return nullptr;
}
}
// Because of SVG/SMIL we have several atoms mapped to the same
// id, but we can rely on MESSAGE_TO_EVENT to map id to only one atom.
static bool
ShouldAddEventToStringEventTable(const EventNameMapping& aMapping)
{
MOZ_ASSERT(aMapping.mAtom);
return GetEventTypeFromMessage(aMapping.mMessage) == aMapping.mAtom;
}
bool
nsContentUtils::InitializeEventTable() {
NS_ASSERTION(!sAtomEventTable, "EventTable already initialized!");
NS_ASSERTION(!sStringEventTable, "EventTable already initialized!");
static const EventNameMapping eventArray[] = {
#define EVENT(name_, _message, _type, _class) \
{ nsGkAtoms::on##name_, _type, _message, _class, false },
#define WINDOW_ONLY_EVENT EVENT
#define DOCUMENT_ONLY_EVENT EVENT
#define NON_IDL_EVENT EVENT
#include "mozilla/EventNameList.h"
#undef WINDOW_ONLY_EVENT
#undef NON_IDL_EVENT
#undef EVENT
{ nullptr }
};
sAtomEventTable = new nsDataHashtable<nsRefPtrHashKey<nsAtom>, EventNameMapping>(
ArrayLength(eventArray));
sStringEventTable = new nsDataHashtable<nsStringHashKey, EventNameMapping>(
ArrayLength(eventArray));
sUserDefinedEvents = new nsTArray<RefPtr<nsAtom>>(64);
// Subtract one from the length because of the trailing null
for (uint32_t i = 0; i < ArrayLength(eventArray) - 1; ++i) {
MOZ_ASSERT(!sAtomEventTable->Lookup(eventArray[i].mAtom),
"Double-defining event name; fix your EventNameList.h");
sAtomEventTable->Put(eventArray[i].mAtom, eventArray[i]);
if (ShouldAddEventToStringEventTable(eventArray[i])) {
sStringEventTable->Put(
Substring(nsDependentAtomString(eventArray[i].mAtom), 2),
eventArray[i]);
}
}
return true;
}
void
nsContentUtils::InitializeTouchEventTable()
{
static bool sEventTableInitialized = false;
if (!sEventTableInitialized && sAtomEventTable && sStringEventTable) {
sEventTableInitialized = true;
static const EventNameMapping touchEventArray[] = {
#define EVENT(name_, _message, _type, _class)
#define TOUCH_EVENT(name_, _message, _type, _class) \
{ nsGkAtoms::on##name_, _type, _message, _class },
#include "mozilla/EventNameList.h"
#undef TOUCH_EVENT
#undef EVENT
{ nullptr }
};
// Subtract one from the length because of the trailing null
for (uint32_t i = 0; i < ArrayLength(touchEventArray) - 1; ++i) {
sAtomEventTable->Put(touchEventArray[i].mAtom, touchEventArray[i]);
sStringEventTable->Put(Substring(nsDependentAtomString(touchEventArray[i].mAtom), 2),
touchEventArray[i]);
}
}
}
static bool
Is8bit(const nsAString& aString)
{
static const char16_t EIGHT_BIT = char16_t(~0x00FF);
for (nsAString::const_char_iterator start = aString.BeginReading(),
end = aString.EndReading();
start != end;
++start) {
if (*start & EIGHT_BIT) {
return false;
}
}
return true;
}
nsresult
nsContentUtils::Btoa(const nsAString& aBinaryData,
nsAString& aAsciiBase64String)
{
if (!Is8bit(aBinaryData)) {
aAsciiBase64String.Truncate();
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
}
return Base64Encode(aBinaryData, aAsciiBase64String);
}
nsresult
nsContentUtils::Atob(const nsAString& aAsciiBase64String,
nsAString& aBinaryData)
{
if (!Is8bit(aAsciiBase64String)) {
aBinaryData.Truncate();
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
}
const char16_t* start = aAsciiBase64String.BeginReading();
const char16_t* cur = start;
const char16_t* end = aAsciiBase64String.EndReading();
bool hasWhitespace = false;
while (cur < end) {
if (nsContentUtils::IsHTMLWhitespace(*cur)) {
hasWhitespace = true;
break;
}
cur++;
}
nsresult rv;
if (hasWhitespace) {
nsString trimmedString;
if (!trimmedString.SetCapacity(aAsciiBase64String.Length(), fallible)) {
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
}
trimmedString.Append(start, cur - start);
while (cur < end) {
if (!nsContentUtils::IsHTMLWhitespace(*cur)) {
trimmedString.Append(*cur);
}
cur++;
}
rv = Base64Decode(trimmedString, aBinaryData);
} else {
rv = Base64Decode(aAsciiBase64String, aBinaryData);
}
if (NS_FAILED(rv) && rv == NS_ERROR_INVALID_ARG) {
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
}
return rv;
}
bool
nsContentUtils::IsAutocompleteEnabled(mozilla::dom::HTMLInputElement* aInput)
{
MOZ_ASSERT(aInput, "aInput should not be null!");
nsAutoString autocomplete;
aInput->GetAutocomplete(autocomplete);
if (autocomplete.IsEmpty()) {
auto* form = aInput->GetForm();
if (!form) {
return true;
}
form->GetAutocomplete(autocomplete);
}
return !autocomplete.EqualsLiteral("off");
}
nsContentUtils::AutocompleteAttrState
nsContentUtils::SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
nsAString& aResult,
AutocompleteAttrState aCachedState)
{
if (!aAttr ||
aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) {
return aCachedState;
}
if (aCachedState == nsContentUtils::eAutocompleteAttrState_Valid) {
uint32_t atomCount = aAttr->GetAtomCount();
for (uint32_t i = 0; i < atomCount; i++) {
if (i != 0) {
aResult.Append(' ');
}
aResult.Append(nsDependentAtomString(aAttr->AtomAt(i)));
}
nsContentUtils::ASCIIToLower(aResult);
return aCachedState;
}
aResult.Truncate();
mozilla::dom::AutocompleteInfo info;
AutocompleteAttrState state =
InternalSerializeAutocompleteAttribute(aAttr, info);
if (state == eAutocompleteAttrState_Valid) {
// Concatenate the info fields.
aResult = info.mSection;
if (!info.mAddressType.IsEmpty()) {
if (!aResult.IsEmpty()) {
aResult += ' ';
}
aResult += info.mAddressType;
}
if (!info.mContactType.IsEmpty()) {
if (!aResult.IsEmpty()) {
aResult += ' ';
}
aResult += info.mContactType;
}
if (!info.mFieldName.IsEmpty()) {
if (!aResult.IsEmpty()) {
aResult += ' ';
}
aResult += info.mFieldName;
}
}
return state;
}
nsContentUtils::AutocompleteAttrState
nsContentUtils::SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
mozilla::dom::AutocompleteInfo& aInfo,
AutocompleteAttrState aCachedState,
bool aGrantAllValidValue)
{
if (!aAttr ||
aCachedState == nsContentUtils::eAutocompleteAttrState_Invalid) {
return aCachedState;
}
return InternalSerializeAutocompleteAttribute(aAttr, aInfo, aGrantAllValidValue);
}
/**
* Helper to validate the @autocomplete tokens.
*
* @return {AutocompleteAttrState} The state of the attribute (invalid/valid).
*/
nsContentUtils::AutocompleteAttrState
nsContentUtils::InternalSerializeAutocompleteAttribute(const nsAttrValue* aAttrVal,
mozilla::dom::AutocompleteInfo& aInfo,
bool aGrantAllValidValue)
{
// No autocomplete attribute so we are done
if (!aAttrVal) {
return eAutocompleteAttrState_Invalid;
}
uint32_t numTokens = aAttrVal->GetAtomCount();
if (!numTokens) {
return eAutocompleteAttrState_Invalid;
}
uint32_t index = numTokens - 1;
nsString tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
AutocompleteCategory category;
nsAttrValue enumValue;
bool unsupported = false;
if (!aGrantAllValidValue) {
unsupported = enumValue.ParseEnumValue(tokenString,
kAutocompleteUnsupportedFieldNameTable,
false);
if (unsupported) {
return eAutocompleteAttrState_Invalid;
}
}
nsAutoString str;
bool result = enumValue.ParseEnumValue(tokenString, kAutocompleteFieldNameTable, false);
if (result) {
// Off/Automatic/Normal categories.
if (enumValue.Equals(NS_LITERAL_STRING("off"), eIgnoreCase) ||
enumValue.Equals(NS_LITERAL_STRING("on"), eIgnoreCase)) {
if (numTokens > 1) {
return eAutocompleteAttrState_Invalid;
}
enumValue.ToString(str);
ASCIIToLower(str);
aInfo.mFieldName.Assign(str);
return eAutocompleteAttrState_Valid;
}
// Only allow on/off if form autofill @autocomplete values aren't enabled
// and it doesn't grant all valid values.
if (!sIsFormAutofillAutocompleteEnabled && !aGrantAllValidValue) {
return eAutocompleteAttrState_Invalid;
}
// Normal category
if (numTokens > 3) {
return eAutocompleteAttrState_Invalid;
}
category = eAutocompleteCategory_NORMAL;
} else { // Check if the last token is of the contact category instead.
// Only allow on/off if form autofill @autocomplete values aren't enabled
// and it doesn't grant all valid values.
if (!sIsFormAutofillAutocompleteEnabled && !aGrantAllValidValue) {
return eAutocompleteAttrState_Invalid;
}
result = enumValue.ParseEnumValue(tokenString, kAutocompleteContactFieldNameTable, false);
if (!result || numTokens > 4) {
return eAutocompleteAttrState_Invalid;
}
category = eAutocompleteCategory_CONTACT;
}
enumValue.ToString(str);
ASCIIToLower(str);
aInfo.mFieldName.Assign(str);
// We are done if this was the only token.
if (numTokens == 1) {
return eAutocompleteAttrState_Valid;
}
--index;
tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
if (category == eAutocompleteCategory_CONTACT) {
if (!aGrantAllValidValue) {
unsupported = enumValue.ParseEnumValue(tokenString,
kAutocompleteUnsupportedContactFieldHintTable,
false);
if (unsupported) {
return eAutocompleteAttrState_Invalid;
}
}
nsAttrValue contactFieldHint;
result = contactFieldHint.ParseEnumValue(tokenString, kAutocompleteContactFieldHintTable, false);
if (result) {
nsAutoString contactFieldHintString;
contactFieldHint.ToString(contactFieldHintString);
ASCIIToLower(contactFieldHintString);
aInfo.mContactType.Assign(contactFieldHintString);
if (index == 0) {
return eAutocompleteAttrState_Valid;
}
--index;
tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
}
}
// Check for billing/shipping tokens
nsAttrValue fieldHint;
if (fieldHint.ParseEnumValue(tokenString, kAutocompleteFieldHintTable, false)) {
nsString fieldHintString;
fieldHint.ToString(fieldHintString);
ASCIIToLower(fieldHintString);
aInfo.mAddressType.Assign(fieldHintString);
if (index == 0) {
return eAutocompleteAttrState_Valid;
}
--index;
tokenString = nsDependentAtomString(aAttrVal->AtomAt(index));
}
// Check for section-* token
const nsDependentSubstring& section = Substring(tokenString, 0, 8);
if (section.LowerCaseEqualsASCII("section-")) {
ASCIIToLower(tokenString);
aInfo.mSection.Assign(tokenString);
if (index == 0) {
return eAutocompleteAttrState_Valid;
}
}
// Clear the fields as the autocomplete attribute is invalid.
aInfo.mSection.Truncate();
aInfo.mAddressType.Truncate();
aInfo.mContactType.Truncate();
aInfo.mFieldName.Truncate();
return eAutocompleteAttrState_Invalid;
}
// Parse an integer according to HTML spec
int32_t
nsContentUtils::ParseHTMLInteger(const nsAString& aValue,
ParseHTMLIntegerResultFlags *aResult)
{
int result = eParseHTMLInteger_NoFlags;
nsAString::const_iterator iter, end;
aValue.BeginReading(iter);
aValue.EndReading(end);
while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) {
result |= eParseHTMLInteger_NonStandard;
++iter;
}
if (iter == end) {
result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue;
*aResult = (ParseHTMLIntegerResultFlags)result;
return 0;
}
int sign = 1;
if (*iter == char16_t('-')) {
sign = -1;
result |= eParseHTMLInteger_Negative;
++iter;
} else if (*iter == char16_t('+')) {
result |= eParseHTMLInteger_NonStandard;
++iter;
}
bool foundValue = false;
CheckedInt32 value = 0;
// Check for leading zeros first.
uint64_t leadingZeros = 0;
while (iter != end) {
if (*iter != char16_t('0')) {
break;
}
++leadingZeros;
foundValue = true;
++iter;
}
while (iter != end) {
if (*iter >= char16_t('0') && *iter <= char16_t('9')) {
value = (value * 10) + (*iter - char16_t('0')) * sign;
++iter;
if (!value.isValid()) {
result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorOverflow;
break;
}
foundValue = true;
} else if (*iter == char16_t('%')) {
++iter;
result |= eParseHTMLInteger_IsPercent;
break;
} else {
break;
}
}
if (!foundValue) {
result |= eParseHTMLInteger_Error | eParseHTMLInteger_ErrorNoValue;
}
if (value.isValid() &&
((leadingZeros > 1 || (leadingZeros == 1 && !(value == 0))) ||
(sign == -1 && value == 0))) {
result |= eParseHTMLInteger_NonStandard;
}
if (iter != end) {
result |= eParseHTMLInteger_DidNotConsumeAllInput;
}
*aResult = (ParseHTMLIntegerResultFlags)result;
return value.isValid() ? value.value() : 0;
}
#define SKIP_WHITESPACE(iter, end_iter, end_res) \
while ((iter) != (end_iter) && nsCRT::IsAsciiSpace(*(iter))) { \
++(iter); \
} \
if ((iter) == (end_iter)) { \
return (end_res); \
}
#define SKIP_ATTR_NAME(iter, end_iter) \
while ((iter) != (end_iter) && !nsCRT::IsAsciiSpace(*(iter)) && \
*(iter) != '=') { \
++(iter); \
}
bool
nsContentUtils::GetPseudoAttributeValue(const nsString& aSource, nsAtom *aName,
nsAString& aValue)
{
aValue.Truncate();
const char16_t *start = aSource.get();
const char16_t *end = start + aSource.Length();
const char16_t *iter;
while (start != end) {
SKIP_WHITESPACE(start, end, false)
iter = start;
SKIP_ATTR_NAME(iter, end)
if (start == iter) {
return false;
}
// Remember the attr name.
const nsDependentSubstring & attrName = Substring(start, iter);
// Now check whether this is a valid name="value" pair.
start = iter;
SKIP_WHITESPACE(start, end, false)
if (*start != '=') {
// No '=', so this is not a name="value" pair. We don't know
// what it is, and we have no way to handle it.
return false;
}
// Have to skip the value.
++start;
SKIP_WHITESPACE(start, end, false)
char16_t q = *start;
if (q != kQuote && q != kApostrophe) {
// Not a valid quoted value, so bail.
return false;
}
++start; // Point to the first char of the value.
iter = start;
while (iter != end && *iter != q) {
++iter;
}
if (iter == end) {
// Oops, unterminated quoted string.
return false;
}
// At this point attrName holds the name of the "attribute" and
// the value is between start and iter.
if (aName->Equals(attrName)) {
// We'll accumulate as many characters as possible (until we hit either
// the end of the string or the beginning of an entity). Chunks will be
// delimited by start and chunkEnd.
const char16_t *chunkEnd = start;
while (chunkEnd != iter) {
if (*chunkEnd == kLessThan) {
aValue.Truncate();
return false;
}
if (*chunkEnd == kAmpersand) {
aValue.Append(start, chunkEnd - start);
const char16_t *afterEntity = nullptr;
char16_t result[2];
uint32_t count =
MOZ_XMLTranslateEntity(reinterpret_cast<const char*>(chunkEnd),
reinterpret_cast<const char*>(iter),
reinterpret_cast<const char**>(&afterEntity),
result);
if (count == 0) {
aValue.Truncate();
return false;
}
aValue.Append(result, count);
// Advance to after the entity and begin a new chunk.
start = chunkEnd = afterEntity;
}
else {
++chunkEnd;
}
}
// Append remainder.
aValue.Append(start, iter - start);
return true;
}
// Resume scanning after the end of the attribute value (past the quote
// char).
start = iter + 1;
}
return false;
}
bool
nsContentUtils::IsJavaScriptLanguage(const nsString& aName)
{
return aName.LowerCaseEqualsLiteral("javascript") ||
aName.LowerCaseEqualsLiteral("livescript") ||
aName.LowerCaseEqualsLiteral("mocha") ||
aName.LowerCaseEqualsLiteral("javascript1.0") ||
aName.LowerCaseEqualsLiteral("javascript1.1") ||
aName.LowerCaseEqualsLiteral("javascript1.2") ||
aName.LowerCaseEqualsLiteral("javascript1.3") ||
aName.LowerCaseEqualsLiteral("javascript1.4") ||
aName.LowerCaseEqualsLiteral("javascript1.5");
}
void
nsContentUtils::SplitMimeType(const nsAString& aValue, nsString& aType,
nsString& aParams)
{
aType.Truncate();
aParams.Truncate();
int32_t semiIndex = aValue.FindChar(char16_t(';'));
if (-1 != semiIndex) {
aType = Substring(aValue, 0, semiIndex);
aParams = Substring(aValue, semiIndex + 1,
aValue.Length() - (semiIndex + 1));
aParams.StripWhitespace();
}
else {
aType = aValue;
}
aType.StripWhitespace();
}
nsresult
nsContentUtils::IsUserIdle(uint32_t aRequestedIdleTimeInMS, bool* aUserIsIdle)
{
nsresult rv;
nsCOMPtr<nsIIdleService> idleService =
do_GetService("@mozilla.org/widget/idleservice;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
uint32_t idleTimeInMS;
rv = idleService->GetIdleTime(&idleTimeInMS);
NS_ENSURE_SUCCESS(rv, rv);
*aUserIsIdle = idleTimeInMS >= aRequestedIdleTimeInMS;
return NS_OK;
}
/**
* A helper function that parses a sandbox attribute (of an <iframe> or a CSP
* directive) and converts it to the set of flags used internally.
*
* @param aSandboxAttr the sandbox attribute
* @return the set of flags (SANDBOXED_NONE if aSandboxAttr is
* null)
*/
uint32_t
nsContentUtils::ParseSandboxAttributeToFlags(const nsAttrValue* aSandboxAttr)
{
if (!aSandboxAttr) {
return SANDBOXED_NONE;
}
uint32_t out = SANDBOX_ALL_FLAGS;
#define SANDBOX_KEYWORD(string, atom, flags) \
if (aSandboxAttr->Contains(nsGkAtoms::atom, eIgnoreCase)) { \
out &= ~(flags); \
}
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD
return out;
}
/**
* A helper function that checks if a string matches a valid sandbox flag.
*
* @param aFlag the potential sandbox flag.
* @return true if the flag is a sandbox flag.
*/
bool
nsContentUtils::IsValidSandboxFlag(const nsAString& aFlag)
{
#define SANDBOX_KEYWORD(string, atom, flags) \
if (EqualsIgnoreASCIICase(nsDependentAtomString(nsGkAtoms::atom), aFlag)) { \
return true; \
}
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD
return false;
}
/**
* A helper function that returns a string attribute corresponding to the
* sandbox flags.
*
* @param aFlags the sandbox flags
* @param aString the attribute corresponding to the flags (null if aFlags
* is zero)
*/
void
nsContentUtils::SandboxFlagsToString(uint32_t aFlags, nsAString& aString)
{
if (!aFlags) {
SetDOMStringToNull(aString);
return;
}
aString.Truncate();
#define SANDBOX_KEYWORD(string, atom, flags) \
if (!(aFlags & (flags))) { \
if (!aString.IsEmpty()) { \
aString.AppendLiteral(u" "); \
} \
aString.Append(nsDependentAtomString(nsGkAtoms::atom)); \
}
#include "IframeSandboxKeywordList.h"
#undef SANDBOX_KEYWORD
}
nsIBidiKeyboard*
nsContentUtils::GetBidiKeyboard()
{
if (!sBidiKeyboard) {
nsresult rv = CallGetService("@mozilla.org/widget/bidikeyboard;1", &sBidiKeyboard);
if (NS_FAILED(rv)) {
sBidiKeyboard = nullptr;
}
}
return sBidiKeyboard;
}
/**
* This is used to determine whether a character is in one of the classes
* which CSS says should be part of the first-letter. Currently, that is
* all punctuation classes (P*). Note that this is a change from CSS2
* which excluded Pc and Pd.
*
* https://www.w3.org/TR/css-pseudo-4/#first-letter-pseudo
* "Punctuation (i.e, characters that belong to the Punctuation (P*) Unicode
* general category [UAX44]) [...]"
*/
// static
bool
nsContentUtils::IsFirstLetterPunctuation(uint32_t aChar)
{
switch (mozilla::unicode::GetGeneralCategory(aChar)) {
case HB_UNICODE_GENERAL_CATEGORY_CONNECT_PUNCTUATION: /* Pc */
case HB_UNICODE_GENERAL_CATEGORY_DASH_PUNCTUATION: /* Pd */
case HB_UNICODE_GENERAL_CATEGORY_CLOSE_PUNCTUATION: /* Pe */
case HB_UNICODE_GENERAL_CATEGORY_FINAL_PUNCTUATION: /* Pf */
case HB_UNICODE_GENERAL_CATEGORY_INITIAL_PUNCTUATION: /* Pi */
case HB_UNICODE_GENERAL_CATEGORY_OTHER_PUNCTUATION: /* Po */
case HB_UNICODE_GENERAL_CATEGORY_OPEN_PUNCTUATION: /* Ps */
return true;
default:
return false;
}
}
// static
bool
nsContentUtils::IsFirstLetterPunctuationAt(const nsTextFragment* aFrag, uint32_t aOffset)
{
char16_t h = aFrag->CharAt(aOffset);
if (!IS_SURROGATE(h)) {
return IsFirstLetterPunctuation(h);
}
if (NS_IS_HIGH_SURROGATE(h) && aOffset + 1 < aFrag->GetLength()) {
char16_t l = aFrag->CharAt(aOffset + 1);
if (NS_IS_LOW_SURROGATE(l)) {
return IsFirstLetterPunctuation(SURROGATE_TO_UCS4(h, l));
}
}
return false;
}
// static
bool nsContentUtils::IsAlphanumeric(uint32_t aChar)
{
nsUGenCategory cat = mozilla::unicode::GetGenCategory(aChar);
return (cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kNumber);
}
// static
bool nsContentUtils::IsAlphanumericAt(const nsTextFragment* aFrag, uint32_t aOffset)
{
char16_t h = aFrag->CharAt(aOffset);
if (!IS_SURROGATE(h)) {
return IsAlphanumeric(h);
}
if (NS_IS_HIGH_SURROGATE(h) && aOffset + 1 < aFrag->GetLength()) {
char16_t l = aFrag->CharAt(aOffset + 1);
if (NS_IS_LOW_SURROGATE(l)) {
return IsAlphanumeric(SURROGATE_TO_UCS4(h, l));
}
}
return false;
}
/* static */
bool
nsContentUtils::IsHTMLWhitespace(char16_t aChar)
{
return aChar == char16_t(0x0009) ||
aChar == char16_t(0x000A) ||
aChar == char16_t(0x000C) ||
aChar == char16_t(0x000D) ||
aChar == char16_t(0x0020);
}
/* static */
bool
nsContentUtils::IsHTMLWhitespaceOrNBSP(char16_t aChar)
{
return IsHTMLWhitespace(aChar) || aChar == char16_t(0xA0);
}
/* static */
bool
nsContentUtils::IsHTMLBlock(nsIContent* aContent)
{
return aContent->IsAnyOfHTMLElements(nsGkAtoms::address,
nsGkAtoms::article,
nsGkAtoms::aside,
nsGkAtoms::blockquote,
nsGkAtoms::center,
nsGkAtoms::dir,
nsGkAtoms::div,
nsGkAtoms::dl, // XXX why not dt and dd?
nsGkAtoms::fieldset,
nsGkAtoms::figure, // XXX shouldn't figcaption be on this list
nsGkAtoms::footer,
nsGkAtoms::form,
nsGkAtoms::h1,
nsGkAtoms::h2,
nsGkAtoms::h3,
nsGkAtoms::h4,
nsGkAtoms::h5,
nsGkAtoms::h6,
nsGkAtoms::header,
nsGkAtoms::hgroup,
nsGkAtoms::hr,
nsGkAtoms::li,
nsGkAtoms::listing,
nsGkAtoms::menu,
nsGkAtoms::multicol, // XXX get rid of this one?
nsGkAtoms::nav,
nsGkAtoms::ol,
nsGkAtoms::p,
nsGkAtoms::pre,
nsGkAtoms::section,
nsGkAtoms::table,
nsGkAtoms::ul,
nsGkAtoms::xmp);
}
/* static */
bool
nsContentUtils::ParseIntMarginValue(const nsAString& aString, nsIntMargin& result)
{
nsAutoString marginStr(aString);
marginStr.CompressWhitespace(true, true);
if (marginStr.IsEmpty()) {
return false;
}
int32_t start = 0, end = 0;
for (int count = 0; count < 4; count++) {
if ((uint32_t)end >= marginStr.Length())
return false;
// top, right, bottom, left
if (count < 3)
end = Substring(marginStr, start).FindChar(',');
else
end = Substring(marginStr, start).Length();
if (end <= 0)
return false;
nsresult ec;
int32_t val = nsString(Substring(marginStr, start, end)).ToInteger(&ec);
if (NS_FAILED(ec))
return false;
switch(count) {
case 0:
result.top = val;
break;
case 1:
result.right = val;
break;
case 2:
result.bottom = val;
break;
case 3:
result.left = val;
break;
}
start += end + 1;
}
return true;
}
// static
int32_t
nsContentUtils::ParseLegacyFontSize(const nsAString& aValue)
{
nsAString::const_iterator iter, end;
aValue.BeginReading(iter);
aValue.EndReading(end);
while (iter != end && nsContentUtils::IsHTMLWhitespace(*iter)) {
++iter;
}
if (iter == end) {
return 0;
}
bool relative = false;
bool negate = false;
if (*iter == char16_t('-')) {
relative = true;
negate = true;
++iter;
} else if (*iter == char16_t('+')) {
relative = true;
++iter;
}
if (iter == end || *iter < char16_t('0') || *iter > char16_t('9')) {
return 0;
}
// We don't have to worry about overflow, since we can bail out as soon as
// we're bigger than 7.
int32_t value = 0;
while (iter != end && *iter >= char16_t('0') && *iter <= char16_t('9')) {
value = 10*value + (*iter - char16_t('0'));
if (value >= 7) {
break;
}
++iter;
}
if (relative) {
if (negate) {
value = 3 - value;
} else {
value = 3 + value;
}
}
return clamped(value, 1, 7);
}
/* static */
void
nsContentUtils::GetOfflineAppManifest(nsIDocument *aDocument, nsIURI **aURI)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aDocument);
*aURI = nullptr;
if (aDocument->GetController().isSome()) {
return;
}
Element* docElement = aDocument->GetRootElement();
if (!docElement) {
return;
}
nsAutoString manifestSpec;
docElement->GetAttr(kNameSpaceID_None, nsGkAtoms::manifest, manifestSpec);
// Manifest URIs can't have fragment identifiers.
if (manifestSpec.IsEmpty() ||
manifestSpec.Contains('#')) {
return;
}
nsContentUtils::NewURIWithDocumentCharset(aURI, manifestSpec,
aDocument,
aDocument->GetDocBaseURI());
}
/* static */
bool
nsContentUtils::OfflineAppAllowed(nsIURI *aURI)
{
nsCOMPtr<nsIOfflineCacheUpdateService> updateService =
do_GetService(NS_OFFLINECACHEUPDATESERVICE_CONTRACTID);
if (!updateService) {
return false;
}
bool allowed;
nsresult rv =
updateService->OfflineAppAllowedForURI(aURI,
Preferences::GetRootBranch(),
&allowed);
return NS_SUCCEEDED(rv) && allowed;
}
/* static */
bool
nsContentUtils::OfflineAppAllowed(nsIPrincipal *aPrincipal)
{
nsCOMPtr<nsIOfflineCacheUpdateService> updateService =
do_GetService(NS_OFFLINECACHEUPDATESERVICE_CONTRACTID);
if (!updateService) {
return false;
}
bool allowed;
nsresult rv = updateService->OfflineAppAllowed(aPrincipal,
Preferences::GetRootBranch(),
&allowed);
return NS_SUCCEEDED(rv) && allowed;
}
bool
nsContentUtils::MaybeAllowOfflineAppByDefault(nsIPrincipal *aPrincipal)
{
if (!Preferences::GetRootBranch())
return false;
nsresult rv;
bool allowedByDefault;
rv = Preferences::GetRootBranch()->GetBoolPref(
"offline-apps.allow_by_default", &allowedByDefault);
if (NS_FAILED(rv))
return false;
if (!allowedByDefault)
return false;
nsCOMPtr<nsIOfflineCacheUpdateService> updateService =
do_GetService(NS_OFFLINECACHEUPDATESERVICE_CONTRACTID);
if (!updateService) {
return false;
}
rv = updateService->AllowOfflineApp(aPrincipal);
return NS_SUCCEEDED(rv);
}
// static
void
nsContentUtils::Shutdown()
{
sInitialized = false;
nsHTMLTags::ReleaseTable();
NS_IF_RELEASE(sContentPolicyService);
sTriedToGetContentPolicy = false;
uint32_t i;
for (i = 0; i < PropertiesFile_COUNT; ++i)
NS_IF_RELEASE(sStringBundles[i]);
NS_IF_RELEASE(sStringBundleService);
NS_IF_RELEASE(sConsoleService);
NS_IF_RELEASE(sXPConnect);
NS_IF_RELEASE(sSecurityManager);
NS_IF_RELEASE(sSystemPrincipal);
NS_IF_RELEASE(sNullSubjectPrincipal);
NS_IF_RELEASE(sIOService);
NS_IF_RELEASE(sUUIDGenerator);
sLineBreaker = nullptr;
sWordBreaker = nullptr;
NS_IF_RELEASE(sBidiKeyboard);
delete sAtomEventTable;
sAtomEventTable = nullptr;
delete sStringEventTable;
sStringEventTable = nullptr;
delete sUserDefinedEvents;
sUserDefinedEvents = nullptr;
if (sEventListenerManagersHash) {
NS_ASSERTION(sEventListenerManagersHash->EntryCount() == 0,
"Event listener manager hash not empty at shutdown!");
// See comment above.
// However, we have to handle this table differently. If it still
// has entries, we want to leak it too, so that we can keep it alive
// in case any elements are destroyed. Because if they are, we need
// their event listener managers to be destroyed too, or otherwise
// it could leave dangling references in DOMClassInfo's preserved
// wrapper table.
if (sEventListenerManagersHash->EntryCount() == 0) {
delete sEventListenerManagersHash;
sEventListenerManagersHash = nullptr;
}
}
NS_ASSERTION(!sBlockedScriptRunners ||
sBlockedScriptRunners->Length() == 0,
"How'd this happen?");
delete sBlockedScriptRunners;
sBlockedScriptRunners = nullptr;
delete sShiftText;
sShiftText = nullptr;
delete sControlText;
sControlText = nullptr;
delete sMetaText;
sMetaText = nullptr;
delete sOSText;
sOSText = nullptr;
delete sAltText;
sAltText = nullptr;
delete sModifierSeparator;
sModifierSeparator = nullptr;
delete sJSBytecodeMimeType;
sJSBytecodeMimeType = nullptr;
NS_IF_RELEASE(sSameOriginChecker);
if (sUserInteractionObserver) {
sUserInteractionObserver->Shutdown();
NS_RELEASE(sUserInteractionObserver);
}
HTMLInputElement::Shutdown();
nsMappedAttributes::Shutdown();
}
/**
* Checks whether two nodes come from the same origin. aTrustedNode is
* considered 'safe' in that a user can operate on it.
*/
// static
nsresult
nsContentUtils::CheckSameOrigin(const nsINode* aTrustedNode,
const nsINode* unTrustedNode)
{
MOZ_ASSERT(aTrustedNode);
MOZ_ASSERT(unTrustedNode);
/*
* Get hold of each node's principal
*/
nsIPrincipal* trustedPrincipal = aTrustedNode->NodePrincipal();
nsIPrincipal* unTrustedPrincipal = unTrustedNode->NodePrincipal();
if (trustedPrincipal == unTrustedPrincipal) {
return NS_OK;
}
bool equal;
// XXXbz should we actually have a Subsumes() check here instead? Or perhaps
// a separate method for that, with callers using one or the other?
if (NS_FAILED(trustedPrincipal->Equals(unTrustedPrincipal, &equal)) ||
!equal) {
return NS_ERROR_DOM_PROP_ACCESS_DENIED;
}
return NS_OK;
}
// static
bool
nsContentUtils::CanCallerAccess(nsIPrincipal* aSubjectPrincipal,
nsIPrincipal* aPrincipal)
{
bool subsumes;
nsresult rv = aSubjectPrincipal->Subsumes(aPrincipal, &subsumes);
NS_ENSURE_SUCCESS(rv, false);
if (subsumes) {
return true;
}
// The subject doesn't subsume aPrincipal. Allow access only if the subject
// is chrome.
return IsCallerChrome();
}
// static
bool
nsContentUtils::CanCallerAccess(nsINode* aNode)
{
return CanCallerAccess(SubjectPrincipal(), aNode->NodePrincipal());
}
// static
bool
nsContentUtils::CanCallerAccess(nsPIDOMWindowInner* aWindow)
{
nsCOMPtr<nsIScriptObjectPrincipal> scriptObject = do_QueryInterface(aWindow);
NS_ENSURE_TRUE(scriptObject, false);
return CanCallerAccess(SubjectPrincipal(), scriptObject->GetPrincipal());
}
// static
bool
nsContentUtils::PrincipalHasPermission(nsIPrincipal* aPrincipal, const nsAtom* aPerm)
{
// Chrome gets access by default.
if (IsSystemPrincipal(aPrincipal)) {
return true;
}
// Otherwise, only allow if caller is an addon with the permission.
return BasePrincipal::Cast(aPrincipal)->AddonHasPermission(aPerm);
}
// static
bool
nsContentUtils::CallerHasPermission(JSContext* aCx, const nsAtom* aPerm)
{
return PrincipalHasPermission(SubjectPrincipal(aCx), aPerm);
}
// static
nsIPrincipal*
nsContentUtils::GetAttrTriggeringPrincipal(nsIContent* aContent, const nsAString& aAttrValue,
nsIPrincipal* aSubjectPrincipal)
{
nsIPrincipal* contentPrin = aContent ? aContent->NodePrincipal() : nullptr;
// If the subject principal is the same as the content principal, or no
// explicit subject principal was provided, we don't need to do any further
// checks. Just return the content principal.
if (contentPrin == aSubjectPrincipal || !aSubjectPrincipal) {
return contentPrin;
}
// If the attribute value is empty, it's not an absolute URL, so don't bother
// with more expensive checks.
if (!aAttrValue.IsEmpty() &&
IsAbsoluteURL(NS_ConvertUTF16toUTF8(aAttrValue))) {
return aSubjectPrincipal;
}
return contentPrin;
}
// static
bool
nsContentUtils::IsAbsoluteURL(const nsACString& aURL)
{
nsAutoCString scheme;
if (NS_FAILED(net_ExtractURLScheme(aURL, scheme))) {
// If we can't extract a scheme, it's not an absolute URL.
return false;
}
// If it parses as an absolute StandardURL, it's definitely an absolute URL,
// so no need to check with the IO service.
if (net_IsAbsoluteURL(aURL)) {
return true;
}
uint32_t flags;
if (NS_SUCCEEDED(sIOService->GetProtocolFlags(scheme.get(), &flags))) {
return flags & nsIProtocolHandler::URI_NORELATIVE;
}
return false;
}
//static
bool
nsContentUtils::InProlog(nsINode *aNode)
{
MOZ_ASSERT(aNode, "missing node to nsContentUtils::InProlog");
nsINode* parent = aNode->GetParentNode();
if (!parent || !parent->IsDocument()) {
return false;
}
nsIDocument* doc = parent->AsDocument();
nsIContent* root = doc->GetRootElement();
return !root || doc->ComputeIndexOf(aNode) < doc->ComputeIndexOf(root);
}
bool
nsContentUtils::IsCallerChrome()
{
MOZ_ASSERT(NS_IsMainThread());
if (SubjectPrincipal() == sSystemPrincipal) {
return true;
}
// If the check failed, look for UniversalXPConnect on the cx compartment.
return xpc::IsUniversalXPConnectEnabled(GetCurrentJSContext());
}
/* static */
bool
nsContentUtils::ShouldResistFingerprinting()
{
return DOMPrefs::ResistFingerprintingEnabled();
}
bool
nsContentUtils::ShouldResistFingerprinting(nsIDocShell* aDocShell)
{
if (!aDocShell) {
return false;
}
return ShouldResistFingerprinting(aDocShell->GetDocument());
}
/* static */
bool
nsContentUtils::ShouldResistFingerprinting(nsIDocument* aDoc) {
if (!aDoc) {
return false;
}
bool isChrome = nsContentUtils::IsChromeDoc(aDoc);
return !isChrome && ShouldResistFingerprinting();
}
/* static */
void
nsContentUtils::CalcRoundedWindowSizeForResistingFingerprinting(int32_t aChromeWidth,
int32_t aChromeHeight,
int32_t aScreenWidth,
int32_t aScreenHeight,
int32_t aInputWidth,
int32_t aInputHeight,
bool aSetOuterWidth,
bool aSetOuterHeight,
int32_t* aOutputWidth,
int32_t* aOutputHeight)
{
MOZ_ASSERT(aOutputWidth);
MOZ_ASSERT(aOutputHeight);
int32_t availContentWidth = 0;
int32_t availContentHeight = 0;
availContentWidth = std::min(sPrivacyMaxInnerWidth,
aScreenWidth - aChromeWidth);
#ifdef MOZ_WIDGET_GTK
// In the GTK window, it will not report outside system decorations
// when we get available window size, see Bug 581863. So, we leave a
// 40 pixels space for them when calculating the available content
// height. It is not necessary for the width since the content width
// is usually pretty much the same as the chrome width.
availContentHeight = std::min(sPrivacyMaxInnerHeight,
(-40 + aScreenHeight) - aChromeHeight);
#else
availContentHeight = std::min(sPrivacyMaxInnerHeight,
aScreenHeight - aChromeHeight);
#endif
// Ideally, we'd like to round window size to 1000x1000, but the
// screen space could be too small to accommodate this size in some
// cases. If it happens, we would round the window size to the nearest
// 200x100.
availContentWidth = availContentWidth - (availContentWidth % 200);
availContentHeight = availContentHeight - (availContentHeight % 100);
// If aIsOuter is true, we are setting the outer window. So we
// have to consider the chrome UI.
int32_t chromeOffsetWidth = aSetOuterWidth ? aChromeWidth : 0;
int32_t chromeOffsetHeight = aSetOuterHeight ? aChromeHeight : 0;
int32_t resultWidth = 0, resultHeight = 0;
// if the original size is greater than the maximum available size, we set
// it to the maximum size. And if the original value is less than the
// minimum rounded size, we set it to the minimum 200x100.
if (aInputWidth > (availContentWidth + chromeOffsetWidth)) {
resultWidth = availContentWidth + chromeOffsetWidth;
} else if (aInputWidth < (200 + chromeOffsetWidth)) {
resultWidth = 200 + chromeOffsetWidth;
} else {
// Otherwise, we round the window to the nearest upper rounded 200x100.
resultWidth = NSToIntCeil((aInputWidth - chromeOffsetWidth) / 200.0) * 200 + chromeOffsetWidth;
}
if (aInputHeight > (availContentHeight + chromeOffsetHeight)) {
resultHeight = availContentHeight + chromeOffsetHeight;
} else if (aInputHeight < (100 + chromeOffsetHeight)) {
resultHeight = 100 + chromeOffsetHeight;
} else {
resultHeight = NSToIntCeil((aInputHeight - chromeOffsetHeight) / 100.0) * 100 + chromeOffsetHeight;
}
*aOutputWidth = resultWidth;
*aOutputHeight = resultHeight;
}
bool
nsContentUtils::ThreadsafeIsCallerChrome()
{
return NS_IsMainThread()
? IsCallerChrome()
: IsCurrentThreadRunningChromeWorker();
}
bool
nsContentUtils::IsCallerContentXBL()
{
JSContext *cx = GetCurrentJSContext();
if (!cx)
return false;
JS::Realm* realm = JS::GetCurrentRealmOrNull(cx);
if (!realm)
return false;
// For remote XUL, we run XBL in the XUL scope. Given that we care about
// compat and not security for remote XUL, just always claim to be XBL.
if (!xpc::AllowContentXBLScope(realm)) {
MOZ_ASSERT(nsContentUtils::AllowXULXBLForPrincipal(xpc::GetRealmPrincipal(realm)));
return true;
}
return xpc::IsContentXBLScope(realm);
}
bool
nsContentUtils::IsSystemCaller(JSContext* aCx)
{
// Note that SubjectPrincipal() assumes we are in a compartment here.
return SubjectPrincipal(aCx) == sSystemPrincipal;
}
bool
nsContentUtils::ThreadsafeIsSystemCaller(JSContext* aCx)
{
CycleCollectedJSContext* ccjscx = CycleCollectedJSContext::Get();
MOZ_ASSERT(ccjscx->Context() == aCx);
return ccjscx->IsSystemCaller();
}
// static
bool
nsContentUtils::LookupBindingMember(JSContext* aCx, nsIContent *aContent,
JS::Handle<jsid> aId,
JS::MutableHandle<JS::PropertyDescriptor> aDesc)
{
nsXBLBinding* binding = aContent->GetXBLBinding();
if (!binding)
return true;
return binding->LookupMember(aCx, aId, aDesc);
}
// static
nsINode*
nsContentUtils::GetCrossDocParentNode(nsINode* aChild)
{
MOZ_ASSERT(aChild, "The child is null!");
nsINode* parent = aChild->GetParentNode();
if (parent && parent->IsContent() && aChild->IsContent()) {
parent = aChild->AsContent()->GetFlattenedTreeParent();
}
if (parent || !aChild->IsDocument()) {
return parent;
}
nsIDocument* doc = aChild->AsDocument();
nsIDocument* parentDoc = doc->GetParentDocument();
return parentDoc ? parentDoc->FindContentForSubDocument(doc) : nullptr;
}
// static
bool
nsContentUtils::ContentIsDescendantOf(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
do {
if (aPossibleDescendant == aPossibleAncestor)
return true;
aPossibleDescendant = aPossibleDescendant->GetParentNode();
} while (aPossibleDescendant);
return false;
}
bool
nsContentUtils::ContentIsHostIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
do {
if (aPossibleDescendant == aPossibleAncestor)
return true;
if (aPossibleDescendant->IsDocumentFragment()) {
aPossibleDescendant =
aPossibleDescendant->AsDocumentFragment()->GetHost();
} else {
aPossibleDescendant = aPossibleDescendant->GetParentNode();
}
} while (aPossibleDescendant);
return false;
}
bool
nsContentUtils::ContentIsShadowIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
if (aPossibleAncestor == aPossibleDescendant->GetComposedDoc()) {
return true;
}
do {
if (aPossibleDescendant == aPossibleAncestor) {
return true;
}
if (aPossibleDescendant->NodeType() == nsINode::DOCUMENT_FRAGMENT_NODE) {
ShadowRoot* shadowRoot =
ShadowRoot::FromNode(const_cast<nsINode*>(aPossibleDescendant));
aPossibleDescendant = shadowRoot ? shadowRoot->GetHost() : nullptr;
} else {
aPossibleDescendant = aPossibleDescendant->GetParentNode();
}
} while (aPossibleDescendant);
return false;
}
// static
bool
nsContentUtils::ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant,
nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
do {
if (aPossibleDescendant == aPossibleAncestor)
return true;
aPossibleDescendant = GetCrossDocParentNode(aPossibleDescendant);
} while (aPossibleDescendant);
return false;
}
// static
bool
nsContentUtils::ContentIsFlattenedTreeDescendantOf(
const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
do {
if (aPossibleDescendant == aPossibleAncestor) {
return true;
}
aPossibleDescendant = aPossibleDescendant->GetFlattenedTreeParentNode();
} while (aPossibleDescendant);
return false;
}
// static
bool
nsContentUtils::ContentIsFlattenedTreeDescendantOfForStyle(
const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor)
{
MOZ_ASSERT(aPossibleDescendant, "The possible descendant is null!");
MOZ_ASSERT(aPossibleAncestor, "The possible ancestor is null!");
do {
if (aPossibleDescendant == aPossibleAncestor) {
return true;
}
aPossibleDescendant =
aPossibleDescendant->GetFlattenedTreeParentNodeForStyle();
} while (aPossibleDescendant);
return false;
}
// static
nsINode*
nsContentUtils::Retarget(nsINode* aTargetA, nsINode* aTargetB)
{
while (true && aTargetA) {
// If A's root is not a shadow root...
nsINode* root = aTargetA->SubtreeRoot();
if (!root->IsShadowRoot()) {
// ...then return A.
return aTargetA;
}
// or A's root is a shadow-including inclusive ancestor of B...
if (nsContentUtils::ContentIsShadowIncludingDescendantOf(aTargetB, root)) {
// ...then return A.
return aTargetA;
}
aTargetA = ShadowRoot::FromNode(root)->GetHost();
}
return nullptr;
}
// static
nsresult
nsContentUtils::GetAncestors(nsINode* aNode,
nsTArray<nsINode*>& aArray)
{
while (aNode) {
aArray.AppendElement(aNode);
aNode = aNode->GetParentNode();
}
return NS_OK;
}
// static
nsresult
nsContentUtils::GetAncestorsAndOffsets(nsINode* aNode,
int32_t aOffset,
nsTArray<nsIContent*>* aAncestorNodes,
nsTArray<int32_t>* aAncestorOffsets)
{
NS_ENSURE_ARG_POINTER(aNode);
if (!aNode->IsContent()) {
return NS_ERROR_FAILURE;
}
nsIContent* content = aNode->AsContent();
if (!aAncestorNodes->IsEmpty()) {
NS_WARNING("aAncestorNodes is not empty");
aAncestorNodes->Clear();
}
if (!aAncestorOffsets->IsEmpty()) {
NS_WARNING("aAncestorOffsets is not empty");
aAncestorOffsets->Clear();
}
// insert the node itself
aAncestorNodes->AppendElement(content);
aAncestorOffsets->AppendElement(aOffset);
// insert all the ancestors
nsIContent* child = content;
nsIContent* parent = child->GetParent();
while (parent) {
aAncestorNodes->AppendElement(parent);
aAncestorOffsets->AppendElement(parent->ComputeIndexOf(child));
child = parent;
parent = parent->GetParent();
}
return NS_OK;
}
template <typename Node, typename GetParentFunc>
static Node*
GetCommonAncestorInternal(Node* aNode1,
Node* aNode2,
GetParentFunc aGetParentFunc)
{
MOZ_ASSERT(aNode1 != aNode2);
// Build the chain of parents
AutoTArray<Node*, 30> parents1, parents2;
do {
parents1.AppendElement(aNode1);
aNode1 = aGetParentFunc(aNode1);
} while (aNode1);
do {
parents2.AppendElement(aNode2);
aNode2 = aGetParentFunc(aNode2);
} while (aNode2);
// Find where the parent chain differs
uint32_t pos1 = parents1.Length();
uint32_t pos2 = parents2.Length();
Node* parent = nullptr;
uint32_t len;
for (len = std::min(pos1, pos2); len > 0; --len) {
Node* child1 = parents1.ElementAt(--pos1);
Node* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
break;
}
parent = child1;
}
return parent;
}
/* static */
nsINode*
nsContentUtils::GetCommonAncestorHelper(nsINode* aNode1, nsINode* aNode2)
{
return GetCommonAncestorInternal(aNode1, aNode2, [](nsINode* aNode) {
return aNode->GetParentNode();
});
}
/* static */
nsIContent*
nsContentUtils::GetCommonFlattenedTreeAncestorHelper(nsIContent* aContent1,
nsIContent* aContent2)
{
return GetCommonAncestorInternal(aContent1, aContent2, [](nsIContent* aContent) {
return aContent->GetFlattenedTreeParent();
});
}
/* static */
Element*
nsContentUtils::GetCommonFlattenedTreeAncestorForStyle(Element* aElement1,
Element* aElement2)
{
return GetCommonAncestorInternal(aElement1, aElement2, [](Element* aElement) {
return aElement->GetFlattenedTreeParentElementForStyle();
});
}
/* static */
bool
nsContentUtils::PositionIsBefore(nsINode* aNode1, nsINode* aNode2,
int32_t* aNode1Index,
int32_t* aNode2Index)
{
// Note, CompareDocumentPosition takes the latter params in different order.
return (aNode2->CompareDocumentPosition(*aNode1, aNode2Index, aNode1Index) &
(Node_Binding::DOCUMENT_POSITION_PRECEDING |
Node_Binding::DOCUMENT_POSITION_DISCONNECTED)) ==
Node_Binding::DOCUMENT_POSITION_PRECEDING;
}
/* static */
int32_t
nsContentUtils::ComparePoints(nsINode* aParent1, int32_t aOffset1,
nsINode* aParent2, int32_t aOffset2,
bool* aDisconnected)
{
if (aParent1 == aParent2) {
// XXX This is odd. aOffset1 and/or aOffset2 may be -1, e.g., it's result
// of nsINode::ComputeIndexOf(), but this compares such invalid
// offset with valid offset.
return aOffset1 < aOffset2 ? -1 :
aOffset1 > aOffset2 ? 1 :
0;
}
AutoTArray<nsINode*, 32> parents1, parents2;
nsINode* node1 = aParent1;
nsINode* node2 = aParent2;
do {
parents1.AppendElement(node1);
node1 = node1->GetParentNode();
} while (node1);
do {
parents2.AppendElement(node2);
node2 = node2->GetParentNode();
} while (node2);
uint32_t pos1 = parents1.Length() - 1;
uint32_t pos2 = parents2.Length() - 1;
bool disconnected = parents1.ElementAt(pos1) != parents2.ElementAt(pos2);
if (aDisconnected) {
*aDisconnected = disconnected;
}
if (disconnected) {
NS_ASSERTION(aDisconnected, "unexpected disconnected nodes");
return 1;
}
// Find where the parent chains differ
nsINode* parent = parents1.ElementAt(pos1);
uint32_t len;
for (len = std::min(pos1, pos2); len > 0; --len) {
nsINode* child1 = parents1.ElementAt(--pos1);
nsINode* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
return parent->ComputeIndexOf(child1) < parent->ComputeIndexOf(child2) ? -1 : 1;
}
parent = child1;
}
// The parent chains never differed, so one of the nodes is an ancestor of
// the other
NS_ASSERTION(!pos1 || !pos2,
"should have run out of parent chain for one of the nodes");
if (!pos1) {
nsINode* child2 = parents2.ElementAt(--pos2);
// XXX aOffset1 may be -1 as mentioned above. So, why does this return
// it's *before* of the valid DOM point?
return aOffset1 <= parent->ComputeIndexOf(child2) ? -1 : 1;
}
nsINode* child1 = parents1.ElementAt(--pos1);
// XXX aOffset2 may be -1 as mentioned above. So, why does this return it's
// *after* of the valid DOM point?
return parent->ComputeIndexOf(child1) < aOffset2 ? -1 : 1;
}
/* static */
int32_t
nsContentUtils::ComparePoints(const RawRangeBoundary& aFirst,
const RawRangeBoundary& aSecond,
bool* aDisconnected)
{
if (NS_WARN_IF(!aFirst.IsSet()) || NS_WARN_IF(!aSecond.IsSet())) {
return -1;
}
return ComparePoints(aFirst.Container(), aFirst.Offset(),
aSecond.Container(), aSecond.Offset(),
aDisconnected);
}
inline bool
IsCharInSet(const char* aSet,
const char16_t aChar)
{
char16_t ch;
while ((ch = *aSet)) {
if (aChar == char16_t(ch)) {
return true;
}
++aSet;
}
return false;
}
/**
* This method strips leading/trailing chars, in given set, from string.
*/
// static
const nsDependentSubstring
nsContentUtils::TrimCharsInSet(const char* aSet,
const nsAString& aValue)
{
nsAString::const_iterator valueCurrent, valueEnd;
aValue.BeginReading(valueCurrent);
aValue.EndReading(valueEnd);
// Skip characters in the beginning
while (valueCurrent != valueEnd) {
if (!IsCharInSet(aSet, *valueCurrent)) {
break;
}
++valueCurrent;
}
if (valueCurrent != valueEnd) {
for (;;) {
--valueEnd;
if (!IsCharInSet(aSet, *valueEnd)) {
break;
}
}
++valueEnd; // Step beyond the last character we want in the value.
}
// valueEnd should point to the char after the last to copy
return Substring(valueCurrent, valueEnd);
}
/**
* This method strips leading and trailing whitespace from a string.
*/
// static
template<bool IsWhitespace(char16_t)>
const nsDependentSubstring
nsContentUtils::TrimWhitespace(const nsAString& aStr, bool aTrimTrailing)
{
nsAString::const_iterator start, end;
aStr.BeginReading(start);
aStr.EndReading(end);
// Skip whitespace characters in the beginning
while (start != end && IsWhitespace(*start)) {
++start;
}
if (aTrimTrailing) {
// Skip whitespace characters in the end.
while (end != start) {
--end;
if (!IsWhitespace(*end)) {
// Step back to the last non-whitespace character.
++end;
break;
}
}
}
// Return a substring for the string w/o leading and/or trailing
// whitespace
return Substring(start, end);
}
// Declaring the templates we are going to use avoid linking issues without
// inlining the method. Considering there is not so much spaces checking
// methods we can consider this to be better than inlining.
template
const nsDependentSubstring
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(const nsAString&, bool);
template
const nsDependentSubstring
nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(const nsAString&, bool);
template
const nsDependentSubstring
nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespaceOrNBSP>(const nsAString&, bool);
static inline void KeyAppendSep(nsACString& aKey)
{
if (!aKey.IsEmpty()) {
aKey.Append('>');
}
}
static inline void KeyAppendString(const nsAString& aString, nsACString& aKey)
{
KeyAppendSep(aKey);
// Could escape separator here if collisions happen. > is not a legal char
// for a name or type attribute, so we should be safe avoiding that extra work.
AppendUTF16toUTF8(aString, aKey);
}
static inline void KeyAppendString(const nsACString& aString, nsACString& aKey)
{
KeyAppendSep(aKey);
// Could escape separator here if collisions happen. > is not a legal char
// for a name or type attribute, so we should be safe avoiding that extra work.
aKey.Append(aString);
}
static inline void KeyAppendInt(int32_t aInt, nsACString& aKey)
{
KeyAppendSep(aKey);
aKey.Append(nsPrintfCString("%d", aInt));
}
static inline bool IsAutocompleteOff(const nsIContent* aContent)
{
return aContent->IsElement() &&
aContent->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::autocomplete,
NS_LITERAL_STRING("off"),
eIgnoreCase);
}
/*static*/ nsresult
nsContentUtils::GenerateStateKey(nsIContent* aContent,
nsIDocument* aDocument,
nsACString& aKey)
{
aKey.Truncate();
uint32_t partID = aDocument ? aDocument->GetPartID() : 0;
// We must have content if we're not using a special state id
NS_ENSURE_TRUE(aContent, NS_ERROR_FAILURE);
// Don't capture state for anonymous content
if (aContent->IsInAnonymousSubtree()) {
return NS_OK;
}
if (IsAutocompleteOff(aContent)) {
return NS_OK;
}
nsCOMPtr<nsIHTMLDocument> htmlDocument =
do_QueryInterface(aContent->GetUncomposedDoc());
KeyAppendInt(partID, aKey); // first append a partID
bool generatedUniqueKey = false;
if (htmlDocument) {
nsHTMLDocument* htmlDoc = static_cast<nsHTMLDocument*> (htmlDocument.get());
RefPtr<nsContentList> htmlForms;
RefPtr<nsContentList> htmlFormControls;
htmlDoc->GetFormsAndFormControls(getter_AddRefs(htmlForms),
getter_AddRefs(htmlFormControls));
// If we have a form control and can calculate form information, use that
// as the key - it is more reliable than just recording position in the
// DOM.
// XXXbz Is it, really? We have bugs on this, I think...
// Important to have a unique key, and tag/type/name may not be.
//
// If the control has a form, the format of the key is:
// f>type>IndOfFormInDoc>IndOfControlInForm>FormName>name
// else:
// d>type>IndOfControlInDoc>name
//
// XXX We don't need to use index if name is there
// XXXbz We don't? Why not? I don't follow.
//
nsCOMPtr<nsIFormControl> control(do_QueryInterface(aContent));
if (control) {
// Append the control type
KeyAppendInt(control->ControlType(), aKey);
// If in a form, add form name / index of form / index in form
Element *formElement = control->GetFormElement();
if (formElement) {
if (IsAutocompleteOff(formElement)) {
aKey.Truncate();
return NS_OK;
}
KeyAppendString(NS_LITERAL_CSTRING("f"), aKey);
// Append the index of the form in the document
int32_t index = htmlForms->IndexOf(formElement, false);
if (index <= -1) {
//
// XXX HACK this uses some state that was dumped into the document
// specifically to fix bug 138892. What we are trying to do is *guess*
// which form this control's state is found in, with the highly likely
// guess that the highest form parsed so far is the one.
// This code should not be on trunk, only branch.
//
index = htmlDocument->GetNumFormsSynchronous() - 1;
}
if (index > -1) {
KeyAppendInt(index, aKey);
// Append the index of the control in the form
nsCOMPtr<nsIForm> form(do_QueryInterface(formElement));
index = form->IndexOfControl(control);
if (index > -1) {
KeyAppendInt(index, aKey);
generatedUniqueKey = true;
}
}
// Append the form name
nsAutoString formName;
formElement->GetAttr(kNameSpaceID_None, nsGkAtoms::name, formName);
KeyAppendString(formName, aKey);
} else {
KeyAppendString(NS_LITERAL_CSTRING("d"), aKey);
// If not in a form, add index of control in document
// Less desirable than indexing by form info.
// Hash by index of control in doc (we are not in a form)
// These are important as they are unique, and type/name may not be.
// We have to flush sink notifications at this point to make
// sure that htmlFormControls is up to date.
int32_t index = htmlFormControls->IndexOf(aContent, true);
if (index > -1) {
KeyAppendInt(index, aKey);
generatedUniqueKey = true;
}
}
// Append the control name
nsAutoString name;
aContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::name, name);
KeyAppendString(name, aKey);
}
}
if (!generatedUniqueKey) {
// Either we didn't have a form control or we aren't in an HTML document so
// we can't figure out form info. Append the tag name if it's an element
// to avoid restoring state for one type of element on another type.
if (aContent->IsElement()) {
KeyAppendString(nsDependentAtomString(aContent->NodeInfo()->NameAtom()),
aKey);
}
else {
// Append a character that is not "d" or "f" to disambiguate from
// the case when we were a form control in an HTML document.
KeyAppendString(NS_LITERAL_CSTRING("o"), aKey);
}
// Now start at aContent and append the indices of it and all its ancestors
// in their containers. That should at least pin down its position in the
// DOM...
nsINode* parent = aContent->GetParentNode();
nsINode* content = aContent;
while (parent) {
KeyAppendInt(parent->ComputeIndexOf(content), aKey);
content = parent;
parent = content->GetParentNode();
}
}
return NS_OK;
}
// static
nsIPrincipal*
nsContentUtils::SubjectPrincipal(JSContext* aCx)
{
MOZ_ASSERT(NS_IsMainThread());
// As opposed to SubjectPrincipal(), we do in fact assume that
// we're in a realm here; anyone who calls this function in
// situations where that's not the case is doing it wrong.
JS::Realm* realm = js::GetContextRealm(aCx);
MOZ_ASSERT(realm);
JSPrincipals* principals = JS::GetRealmPrincipals(realm);
return nsJSPrincipals::get(principals);
}
// static
nsIPrincipal*
nsContentUtils::SubjectPrincipal()
{
MOZ_ASSERT(IsInitialized());
MOZ_ASSERT(NS_IsMainThread());
JSContext* cx = GetCurrentJSContext();
if (!cx) {
MOZ_CRASH("Accessing the Subject Principal without an AutoJSAPI on the stack is forbidden");
}
JS::Realm* realm = js::GetContextRealm(cx);
// When an AutoJSAPI is instantiated, we are in a null realm until the
// first JSAutoRealm, which is kind of a purgatory as far as permissions
// go. It would be nice to just hard-abort if somebody does a security check
// in this purgatory zone, but that would be too fragile, since it could be
// triggered by random IsCallerChrome() checks 20-levels deep.
//
// So we want to return _something_ here - and definitely not the System
// Principal, since that would make an AutoJSAPI a very dangerous thing to
// instantiate.
//
// The natural thing to return is a null principal. Ideally, we'd return a
// different null principal each time, to avoid any unexpected interactions
// when the principal accidentally gets inherited somewhere. But
// SubjectPrincipal doesn't return strong references, so there's no way to
// sanely manage the lifetime of multiple null principals.
//
// So we use a singleton null principal. To avoid it being accidentally
// inherited and becoming a "real" subject or object principal, we do a
// release-mode assert during realm creation against using this principal on
// an actual global.
if (!realm) {
return sNullSubjectPrincipal;
}
return SubjectPrincipal(cx);
}
// static
nsIPrincipal*
nsContentUtils::ObjectPrincipal(JSObject* aObj)
{
MOZ_ASSERT(NS_IsMainThread());
#ifdef DEBUG
JS::AssertObjectBelongsToCurrentThread(aObj);
#endif
MOZ_DIAGNOSTIC_ASSERT(!js::IsCrossCompartmentWrapper(aObj));
JS::Realm* realm = js::GetNonCCWObjectRealm(aObj);
JSPrincipals* principals = JS::GetRealmPrincipals(realm);
return nsJSPrincipals::get(principals);
}
// static
nsresult
nsContentUtils::NewURIWithDocumentCharset(nsIURI** aResult,
const nsAString& aSpec,
nsIDocument* aDocument,
nsIURI* aBaseURI)
{
if (aDocument) {
return NS_NewURI(aResult, aSpec,
aDocument->GetDocumentCharacterSet(),
aBaseURI, sIOService);
}
return NS_NewURI(aResult, aSpec, nullptr, aBaseURI, sIOService);
}
// static
bool
nsContentUtils::IsNameWithDash(nsAtom* aName)
{
// A valid custom element name is a sequence of characters name which
// must match the PotentialCustomElementName production:
// PotentialCustomElementName ::= [a-z] (PCENChar)* '-' (PCENChar)*
const char16_t* name = aName->GetUTF16String();
uint32_t len = aName->GetLength();
bool hasDash = false;
if (!len || name[0] < 'a' || name[0] > 'z') {
return false;
}
uint32_t i = 1;
while (i < len) {
if (NS_IS_HIGH_SURROGATE(name[i]) && i + 1 < len &&
NS_IS_LOW_SURROGATE(name[i + 1])) {
// Merged two 16-bit surrogate pairs into code point.
char32_t code = SURROGATE_TO_UCS4(name[i], name[i + 1]);
if (code < 0x10000 || code > 0xEFFFF) {
return false;
}
i += 2;
} else {
if (name[i] == '-') {
hasDash = true;
}
if (name[i] != '-' && name[i] != '.' &&
name[i] != '_' && name[i] != 0xB7 &&
(name[i] < '0' || name[i] > '9') &&
(name[i] < 'a' || name[i] > 'z') &&
(name[i] < 0xC0 || name[i] > 0xD6) &&
(name[i] < 0xF8 || name[i] > 0x37D) &&
(name[i] < 0x37F || name[i] > 0x1FFF) &&
(name[i] < 0x200C || name[i] > 0x200D) &&
(name[i] < 0x203F || name[i] > 0x2040) &&
(name[i] < 0x2070 || name[i] > 0x218F) &&
(name[i] < 0x2C00 || name[i] > 0x2FEF) &&
(name[i] < 0x3001 || name[i] > 0xD7FF) &&
(name[i] < 0xF900 || name[i] > 0xFDCF) &&
(name[i] < 0xFDF0 || name[i] > 0xFFFD)) {
return false;
}
i++;
}
}
return hasDash;
}
// static
bool
nsContentUtils::IsCustomElementName(nsAtom* aName, uint32_t aNameSpaceID)
{
// Allow non-dashed names in XUL for XBL to Custom Element migrations.
if (aNameSpaceID == kNameSpaceID_XUL) {
return true;
}
bool hasDash = IsNameWithDash(aName);
if (!hasDash) {
return false;
}
// The custom element name must not be one of the following values:
// annotation-xml
// color-profile
// font-face
// font-face-src
// font-face-uri
// font-face-format
// font-face-name
// missing-glyph
return aName != nsGkAtoms::annotation_xml_ &&
aName != nsGkAtoms::colorProfile &&
aName != nsGkAtoms::font_face &&
aName != nsGkAtoms::font_face_src &&
aName != nsGkAtoms::font_face_uri &&
aName != nsGkAtoms::font_face_format &&
aName != nsGkAtoms::font_face_name &&
aName != nsGkAtoms::missingGlyph;
}
// static
nsresult
nsContentUtils::CheckQName(const nsAString& aQualifiedName,
bool aNamespaceAware,
const char16_t** aColon)
{
const char* colon = nullptr;
const char16_t* begin = aQualifiedName.BeginReading();
const char16_t* end = aQualifiedName.EndReading();
int result = MOZ_XMLCheckQName(reinterpret_cast<const char*>(begin),
reinterpret_cast<const char*>(end),
aNamespaceAware, &colon);
if (!result) {
if (aColon) {
*aColon = reinterpret_cast<const char16_t*>(colon);
}
return NS_OK;
}
return NS_ERROR_DOM_INVALID_CHARACTER_ERR;
}
//static
nsresult
nsContentUtils::SplitQName(const nsIContent* aNamespaceResolver,
const nsString& aQName,
int32_t *aNamespace, nsAtom **aLocalName)
{
const char16_t* colon;
nsresult rv = nsContentUtils::CheckQName(aQName, true, &colon);
NS_ENSURE_SUCCESS(rv, rv);
if (colon) {
const char16_t* end;
aQName.EndReading(end);
nsAutoString nameSpace;
rv = aNamespaceResolver->LookupNamespaceURIInternal(Substring(aQName.get(),
colon),
nameSpace);
NS_ENSURE_SUCCESS(rv, rv);
*aNamespace = NameSpaceManager()->GetNameSpaceID(nameSpace,
nsContentUtils::IsChromeDoc(aNamespaceResolver->OwnerDoc()));
if (*aNamespace == kNameSpaceID_Unknown)
return NS_ERROR_FAILURE;
*aLocalName = NS_AtomizeMainThread(Substring(colon + 1, end)).take();
}
else {
*aNamespace = kNameSpaceID_None;
*aLocalName = NS_AtomizeMainThread(aQName).take();
}
NS_ENSURE_TRUE(aLocalName, NS_ERROR_OUT_OF_MEMORY);
return NS_OK;
}
// static
nsresult
nsContentUtils::GetNodeInfoFromQName(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsNodeInfoManager* aNodeInfoManager,
uint16_t aNodeType,
mozilla::dom::NodeInfo** aNodeInfo)
{
const nsString& qName = PromiseFlatString(aQualifiedName);
const char16_t* colon;
nsresult rv = nsContentUtils::CheckQName(qName, true, &colon);
NS_ENSURE_SUCCESS(rv, rv);
int32_t nsID;
sNameSpaceManager->RegisterNameSpace(aNamespaceURI, nsID);
if (colon) {
const char16_t* end;
qName.EndReading(end);
RefPtr<nsAtom> prefix =
NS_AtomizeMainThread(Substring(qName.get(), colon));
rv = aNodeInfoManager->GetNodeInfo(Substring(colon + 1, end), prefix,
nsID, aNodeType, aNodeInfo);
}
else {
rv = aNodeInfoManager->GetNodeInfo(aQualifiedName, nullptr, nsID,
aNodeType, aNodeInfo);
}
NS_ENSURE_SUCCESS(rv, rv);
return nsContentUtils::IsValidNodeName((*aNodeInfo)->NameAtom(),
(*aNodeInfo)->GetPrefixAtom(),
(*aNodeInfo)->NamespaceID()) ?
NS_OK : NS_ERROR_DOM_NAMESPACE_ERR;
}
// static
void
nsContentUtils::SplitExpatName(const char16_t *aExpatName, nsAtom **aPrefix,
nsAtom **aLocalName, int32_t* aNameSpaceID)
{
/**
* Expat can send the following:
* localName
* namespaceURI<separator>localName
* namespaceURI<separator>localName<separator>prefix
*
* and we use 0xFFFF for the <separator>.
*
*/
const char16_t *uriEnd = nullptr;
const char16_t *nameEnd = nullptr;
const char16_t *pos;
for (pos = aExpatName; *pos; ++pos) {
if (*pos == 0xFFFF) {
if (uriEnd) {
nameEnd = pos;
}
else {
uriEnd = pos;
}
}
}
const char16_t *nameStart;
if (uriEnd) {
if (sNameSpaceManager) {
sNameSpaceManager->RegisterNameSpace(nsDependentSubstring(aExpatName,
uriEnd),
*aNameSpaceID);
}
else {
*aNameSpaceID = kNameSpaceID_Unknown;
}
nameStart = (uriEnd + 1);
if (nameEnd) {
const char16_t *prefixStart = nameEnd + 1;
*aPrefix = NS_AtomizeMainThread(Substring(prefixStart, pos)).take();
}
else {
nameEnd = pos;
*aPrefix = nullptr;
}
}
else {
*aNameSpaceID = kNameSpaceID_None;
nameStart = aExpatName;
nameEnd = pos;
*aPrefix = nullptr;
}
*aLocalName = NS_AtomizeMainThread(Substring(nameStart, nameEnd)).take();
}
// static
nsIPresShell*
nsContentUtils::GetPresShellForContent(const nsIContent* aContent)
{
nsIDocument* doc = aContent->GetComposedDoc();
if (!doc) {
return nullptr;
}
return doc->GetShell();
}
// static
nsPresContext*
nsContentUtils::GetContextForContent(const nsIContent* aContent)
{
nsIPresShell* presShell = GetPresShellForContent(aContent);
if (!presShell) {
return nullptr;
}
return presShell->GetPresContext();
}
// static
bool
nsContentUtils::CanLoadImage(nsIURI* aURI, nsINode* aNode,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal)
{
MOZ_ASSERT(aURI, "Must have a URI");
MOZ_ASSERT(aLoadingDocument, "Must have a document");
MOZ_ASSERT(aLoadingPrincipal, "Must have a loading principal");
nsresult rv;
uint32_t appType = nsIDocShell::APP_TYPE_UNKNOWN;
{
nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = aLoadingDocument->GetDocShell();
if (docShellTreeItem) {
nsCOMPtr<nsIDocShellTreeItem> root;
docShellTreeItem->GetRootTreeItem(getter_AddRefs(root));
nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(root));
if (!docShell || NS_FAILED(docShell->GetAppType(&appType))) {
appType = nsIDocShell::APP_TYPE_UNKNOWN;
}
}
}
if (appType != nsIDocShell::APP_TYPE_EDITOR) {
// Editor apps get special treatment here, editors can load images
// from anywhere. This allows editor to insert images from file://
// into documents that are being edited.
rv = sSecurityManager->
CheckLoadURIWithPrincipal(aLoadingPrincipal, aURI,
nsIScriptSecurityManager::ALLOW_CHROME);
if (NS_FAILED(rv)) {
return false;
}
}
nsCOMPtr<nsILoadInfo> secCheckLoadInfo =
new mozilla::net::LoadInfo(aLoadingPrincipal,
aLoadingPrincipal, // triggering principal
aNode,
nsILoadInfo::SEC_ONLY_FOR_EXPLICIT_CONTENTSEC_CHECK,
nsIContentPolicy::TYPE_INTERNAL_IMAGE);
int16_t decision = nsIContentPolicy::ACCEPT;
rv = NS_CheckContentLoadPolicy(aURI, secCheckLoadInfo,
EmptyCString(), //mime guess
&decision,
GetContentPolicy());
return NS_FAILED(rv) ? false : NS_CP_ACCEPTED(decision);
}
// static
mozilla::OriginAttributes
nsContentUtils::GetOriginAttributes(nsIDocument* aDocument)
{
if (!aDocument) {
return mozilla::OriginAttributes();
}
nsCOMPtr<nsILoadGroup> loadGroup = aDocument->GetDocumentLoadGroup();
if (loadGroup) {
return GetOriginAttributes(loadGroup);
}
mozilla::OriginAttributes attrs;
nsCOMPtr<nsIChannel> channel = aDocument->GetChannel();
if (channel) {
NS_GetOriginAttributes(channel, attrs);
}
return attrs;
}
// static
mozilla::OriginAttributes
nsContentUtils::GetOriginAttributes(nsILoadGroup* aLoadGroup)
{
if (!aLoadGroup) {
return mozilla::OriginAttributes();
}
mozilla::OriginAttributes attrs;
nsCOMPtr<nsIInterfaceRequestor> callbacks;
aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
if (callbacks) {
nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
if (loadContext) {
loadContext->GetOriginAttributes(attrs);
}
}
return attrs;
}
// static
bool
nsContentUtils::IsInPrivateBrowsing(nsIDocument* aDoc)
{
if (!aDoc) {
return false;
}
nsCOMPtr<nsILoadGroup> loadGroup = aDoc->GetDocumentLoadGroup();
if (loadGroup) {
nsCOMPtr<nsIInterfaceRequestor> callbacks;
loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
if (callbacks) {
nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
if (loadContext) {
return loadContext->UsePrivateBrowsing();
}
}
}
nsCOMPtr<nsIChannel> channel = aDoc->GetChannel();
return channel && NS_UsePrivateBrowsing(channel);
}
// static
bool
nsContentUtils::IsInPrivateBrowsing(nsILoadGroup* aLoadGroup)
{
if (!aLoadGroup) {
return false;
}
bool isPrivate = false;
nsCOMPtr<nsIInterfaceRequestor> callbacks;
aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
if (callbacks) {
nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
isPrivate = loadContext && loadContext->UsePrivateBrowsing();
}
return isPrivate;
}
bool
nsContentUtils::DocumentInactiveForImageLoads(nsIDocument* aDocument)
{
if (aDocument && !IsChromeDoc(aDocument) && !aDocument->IsResourceDoc()) {
nsCOMPtr<nsPIDOMWindowInner> win =
do_QueryInterface(aDocument->GetScopeObject());
return !win || !win->GetDocShell();
}
return false;
}
imgLoader*
nsContentUtils::GetImgLoaderForDocument(nsIDocument* aDoc)
{
NS_ENSURE_TRUE(!DocumentInactiveForImageLoads(aDoc), nullptr);
if (!aDoc) {
return imgLoader::NormalLoader();
}
bool isPrivate = IsInPrivateBrowsing(aDoc);
return isPrivate ? imgLoader::PrivateBrowsingLoader()
: imgLoader::NormalLoader();
}
// static
imgLoader*
nsContentUtils::GetImgLoaderForChannel(nsIChannel* aChannel,
nsIDocument* aContext)
{
NS_ENSURE_TRUE(!DocumentInactiveForImageLoads(aContext), nullptr);
if (!aChannel) {
return imgLoader::NormalLoader();
}
nsCOMPtr<nsILoadContext> context;
NS_QueryNotificationCallbacks(aChannel, context);
return context && context->UsePrivateBrowsing() ?
imgLoader::PrivateBrowsingLoader() :
imgLoader::NormalLoader();
}
// static
bool
nsContentUtils::IsImageInCache(nsIURI* aURI, nsIDocument* aDocument)
{
imgILoader* loader = GetImgLoaderForDocument(aDocument);
nsCOMPtr<imgICache> cache = do_QueryInterface(loader);
// If something unexpected happened we return false, otherwise if props
// is set, the image is cached and we return true
nsCOMPtr<nsIProperties> props;
nsresult rv = cache->FindEntryProperties(aURI, aDocument, getter_AddRefs(props));
return (NS_SUCCEEDED(rv) && props);
}
// static
int32_t
nsContentUtils::CORSModeToLoadImageFlags(mozilla::CORSMode aMode)
{
switch (aMode) {
case CORS_ANONYMOUS:
return imgILoader::LOAD_CORS_ANONYMOUS;
case CORS_USE_CREDENTIALS:
return imgILoader::LOAD_CORS_USE_CREDENTIALS;
default:
return 0;
}
}
// static
nsresult
nsContentUtils::LoadImage(nsIURI* aURI, nsINode* aContext,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
uint64_t aRequestContextID,
nsIURI* aReferrer,
net::ReferrerPolicy aReferrerPolicy,
imgINotificationObserver* aObserver, int32_t aLoadFlags,
const nsAString& initiatorType,
imgRequestProxy** aRequest,
uint32_t aContentPolicyType,
bool aUseUrgentStartForChannel)
{
MOZ_ASSERT(aURI, "Must have a URI");
MOZ_ASSERT(aContext, "Must have a context");
MOZ_ASSERT(aLoadingDocument, "Must have a document");
MOZ_ASSERT(aLoadingPrincipal, "Must have a principal");
MOZ_ASSERT(aRequest, "Null out param");
imgLoader* imgLoader = GetImgLoaderForDocument(aLoadingDocument);
if (!imgLoader) {
// nothing we can do here
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsILoadGroup> loadGroup = aLoadingDocument->GetDocumentLoadGroup();
nsIURI *documentURI = aLoadingDocument->GetDocumentURI();
NS_ASSERTION(loadGroup || IsFontTableURI(documentURI),
"Could not get loadgroup; onload may fire too early");
// XXXbz using "documentURI" for the initialDocumentURI is not quite
// right, but the best we can do here...
return imgLoader->LoadImage(aURI, /* uri to load */
documentURI, /* initialDocumentURI */
aReferrer, /* referrer */
aReferrerPolicy, /* referrer policy */
aLoadingPrincipal, /* loading principal */
aRequestContextID, /* request context ID */
loadGroup, /* loadgroup */
aObserver, /* imgINotificationObserver */
aContext, /* loading context */
aLoadingDocument, /* uniquification key */
aLoadFlags, /* load flags */
nullptr, /* cache key */
aContentPolicyType, /* content policy type */
initiatorType, /* the load initiator */
aUseUrgentStartForChannel, /* urgent-start flag */
aRequest);
}
// static
already_AddRefed<imgIContainer>
nsContentUtils::GetImageFromContent(nsIImageLoadingContent* aContent,
imgIRequest **aRequest)
{
if (aRequest) {
*aRequest = nullptr;
}
NS_ENSURE_TRUE(aContent, nullptr);
nsCOMPtr<imgIRequest> imgRequest;
aContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
if (!imgRequest) {
return nullptr;
}
nsCOMPtr<imgIContainer> imgContainer;
imgRequest->GetImage(getter_AddRefs(imgContainer));
if (!imgContainer) {
return nullptr;
}
if (aRequest) {
imgRequest.swap(*aRequest);
}
return imgContainer.forget();
}
//static
already_AddRefed<imgRequestProxy>
nsContentUtils::GetStaticRequest(nsIDocument* aLoadingDocument,
imgRequestProxy* aRequest)
{
NS_ENSURE_TRUE(aRequest, nullptr);
RefPtr<imgRequestProxy> retval;
aRequest->GetStaticRequest(aLoadingDocument, getter_AddRefs(retval));
return retval.forget();
}
// static
bool
nsContentUtils::ContentIsDraggable(nsIContent* aContent)
{
MOZ_ASSERT(aContent);
if (auto htmlElement = nsGenericHTMLElement::FromNode(aContent)) {
if (htmlElement->Draggable()) {
return true;
}
if (htmlElement->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::draggable,
nsGkAtoms::_false,
eIgnoreCase)) {
return false;
}
}
// special handling for content area image and link dragging
return IsDraggableImage(aContent) || IsDraggableLink(aContent);
}
// static
bool
nsContentUtils::IsDraggableImage(nsIContent* aContent)
{
MOZ_ASSERT(aContent, "Must have content node to test");
nsCOMPtr<nsIImageLoadingContent> imageContent(do_QueryInterface(aContent));
if (!imageContent) {
return false;
}
nsCOMPtr<imgIRequest> imgRequest;
imageContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
// XXXbz It may be draggable even if the request resulted in an error. Why?
// Not sure; that's what the old nsContentAreaDragDrop/nsFrame code did.
return imgRequest != nullptr;
}
// static
bool
nsContentUtils::IsDraggableLink(const nsIContent* aContent) {
nsCOMPtr<nsIURI> absURI;
return aContent->IsLink(getter_AddRefs(absURI));
}
// static
nsresult
nsContentUtils::QNameChanged(mozilla::dom::NodeInfo* aNodeInfo, nsAtom* aName,
mozilla::dom::NodeInfo** aResult)
{
nsNodeInfoManager *niMgr = aNodeInfo->NodeInfoManager();
*aResult = niMgr->GetNodeInfo(aName, nullptr,
aNodeInfo->NamespaceID(),
aNodeInfo->NodeType(),
aNodeInfo->GetExtraName()).take();
return NS_OK;
}
static bool
TestSitePerm(nsIPrincipal* aPrincipal, const char* aType, uint32_t aPerm, bool aExactHostMatch)
{
if (!aPrincipal) {
// We always deny (i.e. don't allow) the permission if we don't have a
// principal.
return aPerm != nsIPermissionManager::ALLOW_ACTION;
}
nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();
NS_ENSURE_TRUE(permMgr, false);
uint32_t perm;
nsresult rv;
if (aExactHostMatch) {
rv = permMgr->TestExactPermissionFromPrincipal(aPrincipal, aType, &perm);
} else {
rv = permMgr->TestPermissionFromPrincipal(aPrincipal, aType, &perm);
}
NS_ENSURE_SUCCESS(rv, false);
return perm == aPerm;
}
bool
nsContentUtils::IsSitePermAllow(nsIPrincipal* aPrincipal, const char* aType)
{
return TestSitePerm(aPrincipal, aType, nsIPermissionManager::ALLOW_ACTION, false);
}
bool
nsContentUtils::IsSitePermDeny(nsIPrincipal* aPrincipal, const char* aType)
{
return TestSitePerm(aPrincipal, aType, nsIPermissionManager::DENY_ACTION, false);
}
bool
nsContentUtils::IsExactSitePermAllow(nsIPrincipal* aPrincipal, const char* aType)
{
return TestSitePerm(aPrincipal, aType, nsIPermissionManager::ALLOW_ACTION, true);
}
bool
nsContentUtils::IsExactSitePermDeny(nsIPrincipal* aPrincipal, const char* aType)
{
return TestSitePerm(aPrincipal, aType, nsIPermissionManager::DENY_ACTION, true);
}
static const char *gEventNames[] = {"event"};
static const char *gSVGEventNames[] = {"evt"};
// for b/w compat, the first name to onerror is still 'event', even though it
// is actually the error message
static const char *gOnErrorNames[] = {"event", "source", "lineno",
"colno", "error"};
// static
void
nsContentUtils::GetEventArgNames(int32_t aNameSpaceID,
nsAtom *aEventName,
bool aIsForWindow,
uint32_t *aArgCount,
const char*** aArgArray)
{
#define SET_EVENT_ARG_NAMES(names) \
*aArgCount = sizeof(names)/sizeof(names[0]); \
*aArgArray = names;
// JSEventHandler is what does the arg magic for onerror, and it does
// not seem to take the namespace into account. So we let onerror in all
// namespaces get the 3 arg names.
if (aEventName == nsGkAtoms::onerror && aIsForWindow) {
SET_EVENT_ARG_NAMES(gOnErrorNames);
} else if (aNameSpaceID == kNameSpaceID_SVG) {
SET_EVENT_ARG_NAMES(gSVGEventNames);
} else {
SET_EVENT_ARG_NAMES(gEventNames);
}
}
// Note: The list of content bundles in nsStringBundle.cpp should be updated
// whenever entries are added or removed from this list.
static const char gPropertiesFiles[nsContentUtils::PropertiesFile_COUNT][56] = {
// Must line up with the enum values in |PropertiesFile| enum.
"chrome://global/locale/css.properties",
"chrome://global/locale/xbl.properties",
"chrome://global/locale/xul.properties",
"chrome://global/locale/layout_errors.properties",
"chrome://global/locale/layout/HtmlForm.properties",
"chrome://global/locale/printing.properties",
"chrome://global/locale/dom/dom.properties",
"chrome://global/locale/layout/htmlparser.properties",
"chrome://global/locale/svg/svg.properties",
"chrome://branding/locale/brand.properties",
"chrome://global/locale/commonDialogs.properties",
"chrome://global/locale/mathml/mathml.properties",
"chrome://global/locale/security/security.properties",
"chrome://necko/locale/necko.properties"
};
/* static */ nsresult
nsContentUtils::EnsureStringBundle(PropertiesFile aFile)
{
if (!sStringBundles[aFile]) {
if (!sStringBundleService) {
nsresult rv =
CallGetService(NS_STRINGBUNDLE_CONTRACTID, &sStringBundleService);
NS_ENSURE_SUCCESS(rv, rv);
}
nsIStringBundle *bundle;
nsresult rv =
sStringBundleService->CreateBundle(gPropertiesFiles[aFile], &bundle);
NS_ENSURE_SUCCESS(rv, rv);
sStringBundles[aFile] = bundle; // transfer ownership
}
return NS_OK;
}
/* static */
void
nsContentUtils::AsyncPrecreateStringBundles()
{
// We only ever want to pre-create bundles in the parent process.
//
// All nsContentUtils bundles are shared between the parent and child
// precesses, and the shared memory regions that back them *must* be created
// in the parent, and then sent to all children.
//
// If we attempt to create a bundle in the child before its memory region is
// available, we need to create a temporary non-shared bundle, and later
// replace that with the shared memory copy. So attempting to pre-load in the
// child is wasteful and unnecessary.
MOZ_ASSERT(XRE_IsParentProcess());
for (uint32_t bundleIndex = 0; bundleIndex < PropertiesFile_COUNT; ++bundleIndex) {
nsresult rv = NS_IdleDispatchToCurrentThread(
NS_NewRunnableFunction("AsyncPrecreateStringBundles",
[bundleIndex]() {
PropertiesFile file = static_cast<PropertiesFile>(bundleIndex);
EnsureStringBundle(file);
nsIStringBundle *bundle = sStringBundles[file];
bundle->AsyncPreload();
}));
Unused << NS_WARN_IF(NS_FAILED(rv));
}
}
/* static */
nsresult nsContentUtils::GetLocalizedString(PropertiesFile aFile,
const char* aKey,
nsAString& aResult)
{
nsresult rv = EnsureStringBundle(aFile);
NS_ENSURE_SUCCESS(rv, rv);
nsIStringBundle *bundle = sStringBundles[aFile];
return bundle->GetStringFromName(aKey, aResult);
}
/* static */
nsresult nsContentUtils::FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t **aParams,
uint32_t aParamsLength,
nsAString& aResult)
{
nsresult rv = EnsureStringBundle(aFile);
NS_ENSURE_SUCCESS(rv, rv);
nsIStringBundle *bundle = sStringBundles[aFile];
if (!aParams || !aParamsLength) {
return bundle->GetStringFromName(aKey, aResult);
}
return bundle->FormatStringFromName(aKey, aParams, aParamsLength, aResult);
}
/* static */
nsresult nsContentUtils::FormatLocalizedString(
PropertiesFile aFile,
const char* aKey,
const nsTArray<nsString>& aParamArray,
nsAString& aResult)
{
MOZ_ASSERT(NS_IsMainThread());
UniquePtr<const char16_t*[]> params;
uint32_t paramsLength = aParamArray.Length();
if (paramsLength > 0) {
params = MakeUnique<const char16_t*[]>(paramsLength);
for (uint32_t i = 0; i < paramsLength; ++i) {
params[i] = aParamArray[i].get();
}
}
return FormatLocalizedString(aFile, aKey, params.get(), paramsLength,
aResult);
}
/* static */ void
nsContentUtils::LogSimpleConsoleError(const nsAString& aErrorText,
const char * classification,
bool aFromPrivateWindow)
{
nsCOMPtr<nsIScriptError> scriptError =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID);
if (scriptError) {
nsCOMPtr<nsIConsoleService> console =
do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (console && NS_SUCCEEDED(scriptError->Init(aErrorText, EmptyString(),
EmptyString(), 0, 0,
nsIScriptError::errorFlag,
classification,
aFromPrivateWindow))) {
console->LogMessage(scriptError);
}
}
}
/* static */ nsresult
nsContentUtils::ReportToConsole(uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
PropertiesFile aFile,
const char *aMessageName,
const char16_t **aParams,
uint32_t aParamsLength,
nsIURI* aURI,
const nsString& aSourceLine,
uint32_t aLineNumber,
uint32_t aColumnNumber)
{
NS_ASSERTION((aParams && aParamsLength) || (!aParams && !aParamsLength),
"Supply either both parameters and their number or no"
"parameters and 0.");
nsresult rv;
nsAutoString errorText;
if (aParams) {
rv = FormatLocalizedString(aFile, aMessageName, aParams, aParamsLength,
errorText);
}
else {
rv = GetLocalizedString(aFile, aMessageName, errorText);
}
NS_ENSURE_SUCCESS(rv, rv);
return ReportToConsoleNonLocalized(errorText, aErrorFlags, aCategory,
aDocument, aURI, aSourceLine,
aLineNumber, aColumnNumber);
}
/* static */ void
nsContentUtils::ReportEmptyGetElementByIdArg(const nsIDocument* aDoc)
{
ReportToConsole(nsIScriptError::warningFlag,
NS_LITERAL_CSTRING("DOM"), aDoc,
nsContentUtils::eDOM_PROPERTIES,
"EmptyGetElementByIdParam");
}
/* static */ nsresult
nsContentUtils::ReportToConsoleNonLocalized(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
nsIURI* aURI,
const nsString& aSourceLine,
uint32_t aLineNumber,
uint32_t aColumnNumber,
MissingErrorLocationMode aLocationMode)
{
uint64_t innerWindowID = 0;
if (aDocument) {
if (!aURI) {
aURI = aDocument->GetDocumentURI();
}
innerWindowID = aDocument->InnerWindowID();
}
return ReportToConsoleByWindowID(aErrorText, aErrorFlags, aCategory,
innerWindowID, aURI, aSourceLine,
aLineNumber, aColumnNumber, aLocationMode);
}
/* static */ nsresult
nsContentUtils::ReportToConsoleByWindowID(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
uint64_t aInnerWindowID,
nsIURI* aURI,
const nsString& aSourceLine,
uint32_t aLineNumber,
uint32_t aColumnNumber,
MissingErrorLocationMode aLocationMode)
{
nsresult rv;
if (!sConsoleService) { // only need to bother null-checking here
rv = CallGetService(NS_CONSOLESERVICE_CONTRACTID, &sConsoleService);
NS_ENSURE_SUCCESS(rv, rv);
}
nsAutoCString spec;
if (!aLineNumber && aLocationMode == eUSE_CALLING_LOCATION) {
JSContext *cx = GetCurrentJSContext();
if (cx) {
nsJSUtils::GetCallingLocation(cx, spec, &aLineNumber, &aColumnNumber);
}
}
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
if (!spec.IsEmpty()) {
rv = errorObject->InitWithWindowID(aErrorText,
NS_ConvertUTF8toUTF16(spec), // file name
aSourceLine,
aLineNumber, aColumnNumber,
aErrorFlags, aCategory,
aInnerWindowID);
} else {
rv = errorObject->InitWithSourceURI(aErrorText,
aURI,
aSourceLine,
aLineNumber, aColumnNumber,
aErrorFlags, aCategory,
aInnerWindowID);
}
NS_ENSURE_SUCCESS(rv, rv);
return sConsoleService->LogMessage(errorObject);
}
void
nsContentUtils::LogMessageToConsole(const char* aMsg)
{
if (!sConsoleService) { // only need to bother null-checking here
CallGetService(NS_CONSOLESERVICE_CONTRACTID, &sConsoleService);
if (!sConsoleService) {
return;
}
}
sConsoleService->LogStringMessage(NS_ConvertUTF8toUTF16(aMsg).get());
}
bool
nsContentUtils::IsChromeDoc(nsIDocument *aDocument)
{
if (!aDocument) {
return false;
}
return aDocument->NodePrincipal() == sSystemPrincipal;
}
bool
nsContentUtils::IsChildOfSameType(nsIDocument* aDoc)
{
nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(aDoc->GetDocShell());
nsCOMPtr<nsIDocShellTreeItem> sameTypeParent;
if (docShellAsItem) {
docShellAsItem->GetSameTypeParent(getter_AddRefs(sameTypeParent));
}
return sameTypeParent != nullptr;
}
bool
nsContentUtils::IsPlainTextType(const nsACString& aContentType)
{
// NOTE: if you add a type here, add it to the CONTENTDLF_CATEGORIES
// define in nsContentDLF.h as well.
return aContentType.EqualsLiteral(TEXT_PLAIN) ||
aContentType.EqualsLiteral(TEXT_CSS) ||
aContentType.EqualsLiteral(TEXT_CACHE_MANIFEST) ||
aContentType.EqualsLiteral(TEXT_VTT) ||
aContentType.EqualsLiteral(APPLICATION_JAVASCRIPT) ||
aContentType.EqualsLiteral(APPLICATION_XJAVASCRIPT) ||
aContentType.EqualsLiteral(TEXT_ECMASCRIPT) ||
aContentType.EqualsLiteral(APPLICATION_ECMASCRIPT) ||
aContentType.EqualsLiteral(TEXT_JAVASCRIPT) ||
aContentType.EqualsLiteral(APPLICATION_JSON) ||
aContentType.EqualsLiteral(TEXT_JSON);
}
bool
nsContentUtils::IsUtf8OnlyPlainTextType(const nsACString& aContentType)
{
// NOTE: This must be a subset of the list in IsPlainTextType().
return aContentType.EqualsLiteral(TEXT_CACHE_MANIFEST) ||
aContentType.EqualsLiteral(APPLICATION_JSON) ||
aContentType.EqualsLiteral(TEXT_JSON) ||
aContentType.EqualsLiteral(TEXT_VTT);
}
bool
nsContentUtils::GetWrapperSafeScriptFilename(nsIDocument* aDocument,
nsIURI* aURI,
nsACString& aScriptURI,
nsresult* aRv)
{
MOZ_ASSERT(aRv);
bool scriptFileNameModified = false;
*aRv = NS_OK;
*aRv = aURI->GetSpec(aScriptURI);
NS_ENSURE_SUCCESS(*aRv, false);
if (IsChromeDoc(aDocument)) {
nsCOMPtr<nsIChromeRegistry> chromeReg =
mozilla::services::GetChromeRegistryService();
if (!chromeReg) {
// If we're running w/o a chrome registry we won't modify any
// script file names.
return scriptFileNameModified;
}
bool docWrappersEnabled =
chromeReg->WrappersEnabled(aDocument->GetDocumentURI());
bool uriWrappersEnabled = chromeReg->WrappersEnabled(aURI);
nsIURI *docURI = aDocument->GetDocumentURI();
if (docURI && docWrappersEnabled && !uriWrappersEnabled) {
// aURI is a script from a URL that doesn't get wrapper
// automation. aDocument is a chrome document that does get
// wrapper automation. Prepend the chrome document's URI
// followed by the string " -> " to the URI of the script we're
// loading here so that script in that URI gets the same wrapper
// automation that the chrome document expects.
nsAutoCString spec;
*aRv = docURI->GetSpec(spec);
if (NS_WARN_IF(NS_FAILED(*aRv))) {
return false;
}
spec.AppendLiteral(" -> ");
spec.Append(aScriptURI);
aScriptURI = spec;
scriptFileNameModified = true;
}
}
return scriptFileNameModified;
}
// static
bool
nsContentUtils::IsInChromeDocshell(nsIDocument *aDocument)
{
if (!aDocument) {
return false;
}
if (aDocument->GetDisplayDocument()) {
return IsInChromeDocshell(aDocument->GetDisplayDocument());
}
nsCOMPtr<nsIDocShellTreeItem> docShell = aDocument->GetDocShell();
if (!docShell) {
return false;
}
return docShell->ItemType() == nsIDocShellTreeItem::typeChrome;
}
// static
nsIContentPolicy*
nsContentUtils::GetContentPolicy()
{
if (!sTriedToGetContentPolicy) {
CallGetService(NS_CONTENTPOLICY_CONTRACTID, &sContentPolicyService);
// It's OK to not have a content policy service
sTriedToGetContentPolicy = true;
}
return sContentPolicyService;
}
// static
bool
nsContentUtils::IsEventAttributeName(nsAtom* aName, int32_t aType)
{
const char16_t* name = aName->GetUTF16String();
if (name[0] != 'o' || name[1] != 'n')
return false;
EventNameMapping mapping;
return (sAtomEventTable->Get(aName, &mapping) && mapping.mType & aType);
}
// static
EventMessage
nsContentUtils::GetEventMessage(nsAtom* aName)
{
MOZ_ASSERT(NS_IsMainThread(), "sAtomEventTable is not threadsafe");
if (aName) {
EventNameMapping mapping;
if (sAtomEventTable->Get(aName, &mapping)) {
return mapping.mMessage;
}
}
return eUnidentifiedEvent;
}
// static
mozilla::EventClassID
nsContentUtils::GetEventClassID(const nsAString& aName)
{
EventNameMapping mapping;
if (sStringEventTable->Get(aName, &mapping))
return mapping.mEventClassID;
return eBasicEventClass;
}
nsAtom*
nsContentUtils::GetEventMessageAndAtom(const nsAString& aName,
mozilla::EventClassID aEventClassID,
EventMessage* aEventMessage)
{
MOZ_ASSERT(NS_IsMainThread(), "Our hashtables are not threadsafe");
EventNameMapping mapping;
if (sStringEventTable->Get(aName, &mapping)) {
*aEventMessage =
mapping.mEventClassID == aEventClassID ? mapping.mMessage :
eUnidentifiedEvent;
return mapping.mAtom;
}
// If we have cached lots of user defined event names, clear some of them.
if (sUserDefinedEvents->Length() > 127) {
while (sUserDefinedEvents->Length() > 64) {
nsAtom* first = sUserDefinedEvents->ElementAt(0);
sStringEventTable->Remove(Substring(nsDependentAtomString(first), 2));
sUserDefinedEvents->RemoveElementAt(0);
}
}
*aEventMessage = eUnidentifiedEvent;
RefPtr<nsAtom> atom =
NS_AtomizeMainThread(NS_LITERAL_STRING("on") + aName);
sUserDefinedEvents->AppendElement(atom);
mapping.mAtom = atom;
mapping.mMessage = eUnidentifiedEvent;
mapping.mType = EventNameType_None;
mapping.mEventClassID = eBasicEventClass;
// This is a slow hashtable call, but at least we cache the result for the
// following calls. Because GetEventMessageAndAtomForListener utilizes
// sStringEventTable, it needs to know in which cases sStringEventTable
// doesn't contain the information it needs so that it can use
// sAtomEventTable instead.
mapping.mMaybeSpecialSVGorSMILEvent =
GetEventMessage(atom) != eUnidentifiedEvent;
sStringEventTable->Put(aName, mapping);
return mapping.mAtom;
}
// static
EventMessage
nsContentUtils::GetEventMessageAndAtomForListener(const nsAString& aName,
nsAtom** aOnName)
{
MOZ_ASSERT(NS_IsMainThread(), "Our hashtables are not threadsafe");
// Because of SVG/SMIL sStringEventTable contains a subset of the event names
// comparing to the sAtomEventTable. However, usually sStringEventTable
// contains the information we need, so in order to reduce hashtable
// lookups, start from it.
EventNameMapping mapping;
EventMessage msg = eUnidentifiedEvent;
RefPtr<nsAtom> atom;
if (sStringEventTable->Get(aName, &mapping)) {
if (mapping.mMaybeSpecialSVGorSMILEvent) {
// Try the atom version so that we should get the right message for
// SVG/SMIL.
atom = NS_AtomizeMainThread(NS_LITERAL_STRING("on") + aName);
msg = GetEventMessage(atom);
} else {
atom = mapping.mAtom;
msg = mapping.mMessage;
}
atom.forget(aOnName);
return msg;
}
// GetEventMessageAndAtom will cache the event type for the future usage...
GetEventMessageAndAtom(aName, eBasicEventClass, &msg);
// ...and then call this method recursively to get the message and atom from
// now updated sStringEventTable.
return GetEventMessageAndAtomForListener(aName, aOnName);
}
static
nsresult GetEventAndTarget(nsIDocument* aDoc, nsISupports* aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
Trusted aTrusted,
Event** aEvent,
EventTarget** aTargetOut)
{
nsCOMPtr<EventTarget> target(do_QueryInterface(aTarget));
NS_ENSURE_TRUE(aDoc && target, NS_ERROR_INVALID_ARG);
ErrorResult err;
RefPtr<Event> event = aDoc->CreateEvent(NS_LITERAL_STRING("Events"),
CallerType::System, err);
if (NS_WARN_IF(err.Failed())) {
return err.StealNSResult();
}
event->InitEvent(aEventName, aCanBubble, aCancelable);
event->SetTrusted(aTrusted == Trusted::eYes);
event->SetTarget(target);
event.forget(aEvent);
target.forget(aTargetOut);
return NS_OK;
}
// static
nsresult
nsContentUtils::DispatchTrustedEvent(nsIDocument* aDoc, nsISupports* aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction)
{
return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable,
Trusted::eYes, aDefaultAction);
}
// static
nsresult
nsContentUtils::DispatchUntrustedEvent(nsIDocument* aDoc, nsISupports* aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction)
{
return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable,
Trusted::eNo, aDefaultAction);
}
// static
nsresult
nsContentUtils::DispatchEvent(nsIDocument* aDoc, nsISupports* aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
Trusted aTrusted,
bool* aDefaultAction,
ChromeOnlyDispatch aOnlyChromeDispatch)
{
RefPtr<Event> event;
nsCOMPtr<EventTarget> target;
nsresult rv = GetEventAndTarget(aDoc, aTarget, aEventName, aCanBubble,
aCancelable, aTrusted, getter_AddRefs(event),
getter_AddRefs(target));
NS_ENSURE_SUCCESS(rv, rv);
event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch =
aOnlyChromeDispatch == ChromeOnlyDispatch::eYes;
ErrorResult err;
bool doDefault = target->DispatchEvent(*event, CallerType::System, err);
if (aDefaultAction) {
*aDefaultAction = doDefault;
}
return err.StealNSResult();
}
// static
nsresult
nsContentUtils::DispatchEvent(nsIDocument* aDoc, nsISupports* aTarget,
WidgetEvent& aEvent,
EventMessage aEventMessage,
CanBubble aCanBubble,
Cancelable aCancelable,
Trusted aTrusted,
bool* aDefaultAction,
ChromeOnlyDispatch aOnlyChromeDispatch)
{
MOZ_ASSERT_IF(aOnlyChromeDispatch == ChromeOnlyDispatch::eYes,
aTrusted == Trusted::eYes);
nsCOMPtr<EventTarget> target(do_QueryInterface(aTarget));
aEvent.mTime = PR_Now();
aEvent.mSpecifiedEventType = GetEventTypeFromMessage(aEventMessage);
aEvent.SetDefaultComposed();
aEvent.SetDefaultComposedInNativeAnonymousContent();
aEvent.mFlags.mBubbles = aCanBubble == CanBubble::eYes;
aEvent.mFlags.mCancelable = aCancelable == Cancelable::eYes;
aEvent.mFlags.mOnlyChromeDispatch =
aOnlyChromeDispatch == ChromeOnlyDispatch::eYes;
aEvent.mTarget = target;
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv = EventDispatcher::DispatchDOMEvent(target, &aEvent, nullptr,
nullptr, &status);
if (aDefaultAction) {
*aDefaultAction = (status != nsEventStatus_eConsumeNoDefault);
}
return rv;
}
nsresult
nsContentUtils::DispatchChromeEvent(nsIDocument *aDoc,
nsISupports *aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction)
{
RefPtr<Event> event;
nsCOMPtr<EventTarget> target;
nsresult rv = GetEventAndTarget(aDoc, aTarget, aEventName, aCanBubble,
aCancelable, Trusted::eYes,
getter_AddRefs(event),
getter_AddRefs(target));
NS_ENSURE_SUCCESS(rv, rv);
NS_ASSERTION(aDoc, "GetEventAndTarget lied?");
if (!aDoc->GetWindow())
return NS_ERROR_INVALID_ARG;
EventTarget* piTarget = aDoc->GetWindow()->GetParentTarget();
if (!piTarget)
return NS_ERROR_INVALID_ARG;
ErrorResult err;
bool defaultActionEnabled =
piTarget->DispatchEvent(*event, CallerType::System, err);
if (aDefaultAction) {
*aDefaultAction = defaultActionEnabled;
}
return err.StealNSResult();
}
/* static */
nsresult
nsContentUtils::DispatchFocusChromeEvent(nsPIDOMWindowOuter* aWindow)
{
MOZ_ASSERT(aWindow);
nsCOMPtr<nsIDocument> doc = aWindow->GetExtantDoc();
if (!doc) {
return NS_ERROR_FAILURE;
}
return DispatchChromeEvent(doc, aWindow,
NS_LITERAL_STRING("DOMWindowFocus"),
CanBubble::eYes, Cancelable::eYes);
}
nsresult
nsContentUtils::DispatchEventOnlyToChrome(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
CanBubble aCanBubble,
Cancelable aCancelable,
bool* aDefaultAction)
{
return DispatchEvent(aDoc, aTarget, aEventName, aCanBubble, aCancelable,
Trusted::eYes, aDefaultAction, ChromeOnlyDispatch::eYes);
}
/* static */
Element*
nsContentUtils::MatchElementId(nsIContent *aContent, const nsAtom* aId)
{
for (nsIContent* cur = aContent;
cur;
cur = cur->GetNextNode(aContent)) {
if (aId == cur->GetID()) {
return cur->AsElement();
}
}
return nullptr;
}
/* static */
Element *
nsContentUtils::MatchElementId(nsIContent *aContent, const nsAString& aId)
{
MOZ_ASSERT(!aId.IsEmpty(), "Will match random elements");
// ID attrs are generally stored as atoms, so just atomize this up front
RefPtr<nsAtom> id(NS_Atomize(aId));
if (!id) {
// OOM, so just bail
return nullptr;
}
return MatchElementId(aContent, id);
}
/* static */
nsIDocument*
nsContentUtils::GetSubdocumentWithOuterWindowId(nsIDocument *aDocument,
uint64_t aOuterWindowId)
{
if (!aDocument || !aOuterWindowId) {
return nullptr;
}
RefPtr<nsGlobalWindowOuter> window =
nsGlobalWindowOuter::GetOuterWindowWithId(aOuterWindowId);
if (!window) {
return nullptr;
}
nsCOMPtr<nsPIDOMWindowOuter> outerWindow = window->AsOuter();
nsCOMPtr<nsIDocument> foundDoc = outerWindow->GetDoc();
if (nsContentUtils::ContentIsCrossDocDescendantOf(foundDoc, aDocument)) {
// Note that ContentIsCrossDocDescendantOf will return true if
// foundDoc == aDocument.
return foundDoc;
}
return nullptr;
}
/* static */
void
nsContentUtils::RegisterShutdownObserver(nsIObserver* aObserver)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->AddObserver(aObserver,
NS_XPCOM_SHUTDOWN_OBSERVER_ID,
false);
}
}
/* static */
void
nsContentUtils::UnregisterShutdownObserver(nsIObserver* aObserver)
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(aObserver, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
}
/* static */
bool
nsContentUtils::HasNonEmptyAttr(const nsIContent* aContent,
int32_t aNameSpaceID,
nsAtom* aName)
{
static Element::AttrValuesArray strings[] = {&nsGkAtoms::_empty, nullptr};
return aContent->IsElement() &&
aContent->AsElement()->FindAttrValueIn(aNameSpaceID, aName, strings, eCaseMatters)
== Element::ATTR_VALUE_NO_MATCH;
}
/* static */
bool
nsContentUtils::HasMutationListeners(nsINode* aNode,
uint32_t aType,
nsINode* aTargetForSubtreeModified)
{
nsIDocument* doc = aNode->OwnerDoc();
// global object will be null for documents that don't have windows.
nsPIDOMWindowInner* window = doc->GetInnerWindow();
// This relies on EventListenerManager::AddEventListener, which sets
// all mutation bits when there is a listener for DOMSubtreeModified event.
if (window && !window->HasMutationListeners(aType)) {
return false;
}
if (aNode->IsContent() && aNode->AsContent()->ChromeOnlyAccess()) {
return false;
}
doc->MayDispatchMutationEvent(aTargetForSubtreeModified);
// If we have a window, we can check it for mutation listeners now.
if (aNode->IsInUncomposedDoc()) {
nsCOMPtr<EventTarget> piTarget(do_QueryInterface(window));
if (piTarget) {
EventListenerManager* manager = piTarget->GetExistingListenerManager();
if (manager && manager->HasMutationListeners()) {
return true;
}
}
}
// If we have a window, we know a mutation listener is registered, but it
// might not be in our chain. If we don't have a window, we might have a
// mutation listener. Check quickly to see.
while (aNode) {
EventListenerManager* manager = aNode->GetExistingListenerManager();
if (manager && manager->HasMutationListeners()) {
return true;
}
if (aNode->IsContent()) {
nsIContent* insertionPoint = aNode->AsContent()->GetXBLInsertionPoint();
if (insertionPoint) {
aNode = insertionPoint->GetParent();
MOZ_ASSERT(aNode);
continue;
}
}
aNode = aNode->GetParentNode();
}
return false;
}
/* static */
bool
nsContentUtils::HasMutationListeners(nsIDocument* aDocument,
uint32_t aType)
{
nsPIDOMWindowInner* window = aDocument ?
aDocument->GetInnerWindow() : nullptr;
// This relies on EventListenerManager::AddEventListener, which sets
// all mutation bits when there is a listener for DOMSubtreeModified event.
return !window || window->HasMutationListeners(aType);
}
void
nsContentUtils::MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent)
{
MOZ_ASSERT(aChild, "Missing child");
MOZ_ASSERT(aChild->GetParentNode() == aParent, "Wrong parent");
MOZ_ASSERT(aChild->OwnerDoc() == aParent->OwnerDoc(), "Wrong owner-doc");
// Having an explicit check here since it's an easy mistake to fall into,
// and there might be existing code with problems. We'd rather be safe
// than fire DOMNodeRemoved in all corner cases. We also rely on it for
// nsAutoScriptBlockerSuppressNodeRemoved.
if (!IsSafeToRunScript()) {
// This checks that IsSafeToRunScript is true since we don't want to fire
// events when that is false. We can't rely on EventDispatcher to assert
// this in this situation since most of the time there are no mutation
// event listeners, in which case we won't even attempt to dispatch events.
// However this also allows for two exceptions. First off, we don't assert
// if the mutation happens to native anonymous content since we never fire
// mutation events on such content anyway.
// Second, we don't assert if sDOMNodeRemovedSuppressCount is true since
// that is a know case when we'd normally fire a mutation event, but can't
// make that safe and so we suppress it at this time. Ideally this should
// go away eventually.
if (!(aChild->IsContent() && aChild->AsContent()->IsInNativeAnonymousSubtree()) &&
!sDOMNodeRemovedSuppressCount) {
NS_ERROR("Want to fire DOMNodeRemoved event, but it's not safe");
WarnScriptWasIgnored(aChild->OwnerDoc());
}
return;
}
if (HasMutationListeners(aChild,
NS_EVENT_BITS_MUTATION_NODEREMOVED, aParent)) {
InternalMutationEvent mutation(true, eLegacyNodeRemoved);
mutation.mRelatedNode = aParent;
mozAutoSubtreeModified subtree(aParent->OwnerDoc(), aParent);
EventDispatcher::Dispatch(aChild, nullptr, &mutation);
}
}
void
nsContentUtils::UnmarkGrayJSListenersInCCGenerationDocuments()
{
if (!sEventListenerManagersHash) {
return;
}
for (auto i = sEventListenerManagersHash->Iter(); !i.Done(); i.Next()) {
auto entry = static_cast<EventListenerManagerMapEntry*>(i.Get());
nsINode* n = static_cast<nsINode*>(entry->mListenerManager->GetTarget());
if (n && n->IsInComposedDoc() &&
nsCCUncollectableMarker::InGeneration(n->OwnerDoc()->GetMarkedCCGeneration())) {
entry->mListenerManager->MarkForCC();
}
}
}
/* static */
void
nsContentUtils::TraverseListenerManager(nsINode *aNode,
nsCycleCollectionTraversalCallback &cb)
{
if (!sEventListenerManagersHash) {
// We're already shut down, just return.
return;
}
auto entry = static_cast<EventListenerManagerMapEntry*>
(sEventListenerManagersHash->Search(aNode));
if (entry) {
CycleCollectionNoteChild(cb, entry->mListenerManager.get(),
"[via hash] mListenerManager");
}
}
EventListenerManager*
nsContentUtils::GetListenerManagerForNode(nsINode *aNode)
{
if (!sEventListenerManagersHash) {
// We're already shut down, don't bother creating an event listener
// manager.
return nullptr;
}
auto entry =
static_cast<EventListenerManagerMapEntry*>
(sEventListenerManagersHash->Add(aNode, fallible));
if (!entry) {
return nullptr;
}
if (!entry->mListenerManager) {
entry->mListenerManager = new EventListenerManager(aNode);
aNode->SetFlags(NODE_HAS_LISTENERMANAGER);
}
return entry->mListenerManager;
}
EventListenerManager*
nsContentUtils::GetExistingListenerManagerForNode(const nsINode *aNode)
{
if (!aNode->HasFlag(NODE_HAS_LISTENERMANAGER)) {
return nullptr;
}
if (!sEventListenerManagersHash) {
// We're already shut down, don't bother creating an event listener
// manager.
return nullptr;
}
auto entry = static_cast<EventListenerManagerMapEntry*>
(sEventListenerManagersHash->Search(aNode));
if (entry) {
return entry->mListenerManager;
}
return nullptr;
}
/* static */
void
nsContentUtils::RemoveListenerManager(nsINode *aNode)
{
if (sEventListenerManagersHash) {
auto entry = static_cast<EventListenerManagerMapEntry*>
(sEventListenerManagersHash->Search(aNode));
if (entry) {
RefPtr<EventListenerManager> listenerManager;
listenerManager.swap(entry->mListenerManager);
// Remove the entry and *then* do operations that could cause further
// modification of sEventListenerManagersHash. See bug 334177.
sEventListenerManagersHash->RawRemove(entry);
if (listenerManager) {
listenerManager->Disconnect();
}
}
}
}
/* static */
bool
nsContentUtils::IsValidNodeName(nsAtom *aLocalName, nsAtom *aPrefix,
int32_t aNamespaceID)
{
if (aNamespaceID == kNameSpaceID_Unknown) {
return false;
}
if (!aPrefix) {
// If the prefix is null, then either the QName must be xmlns or the
// namespace must not be XMLNS.
return (aLocalName == nsGkAtoms::xmlns) ==
(aNamespaceID == kNameSpaceID_XMLNS);
}
// If the prefix is non-null then the namespace must not be null.
if (aNamespaceID == kNameSpaceID_None) {
return false;
}
// If the namespace is the XMLNS namespace then the prefix must be xmlns,
// but the localname must not be xmlns.
if (aNamespaceID == kNameSpaceID_XMLNS) {
return aPrefix == nsGkAtoms::xmlns && aLocalName != nsGkAtoms::xmlns;
}
// If the namespace is not the XMLNS namespace then the prefix must not be
// xmlns.
// If the namespace is the XML namespace then the prefix can be anything.
// If the namespace is not the XML namespace then the prefix must not be xml.
return aPrefix != nsGkAtoms::xmlns &&
(aNamespaceID == kNameSpaceID_XML || aPrefix != nsGkAtoms::xml);
}
already_AddRefed<DocumentFragment>
nsContentUtils::CreateContextualFragment(nsINode* aContextNode,
const nsAString& aFragment,
bool aPreventScriptExecution,
ErrorResult& aRv)
{
if (!aContextNode) {
aRv.Throw(NS_ERROR_INVALID_ARG);
return nullptr;
}
// If we don't have a document here, we can't get the right security context
// for compiling event handlers... so just bail out.
nsCOMPtr<nsIDocument> document = aContextNode->OwnerDoc();
bool isHTML = document->IsHTMLDocument();
#ifdef DEBUG
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
NS_ASSERTION(!isHTML || htmlDoc, "Should have HTMLDocument here!");
#endif
if (isHTML) {
RefPtr<DocumentFragment> frag =
new DocumentFragment(document->NodeInfoManager());
nsCOMPtr<nsIContent> contextAsContent = do_QueryInterface(aContextNode);
if (contextAsContent && !contextAsContent->IsElement()) {
contextAsContent = contextAsContent->GetParent();
if (contextAsContent && !contextAsContent->IsElement()) {
// can this even happen?
contextAsContent = nullptr;
}
}
if (contextAsContent && !contextAsContent->IsHTMLElement(nsGkAtoms::html)) {
aRv = ParseFragmentHTML(aFragment, frag,
contextAsContent->NodeInfo()->NameAtom(),
contextAsContent->GetNameSpaceID(),
(document->GetCompatibilityMode() ==
eCompatibility_NavQuirks),
aPreventScriptExecution);
} else {
aRv = ParseFragmentHTML(aFragment, frag,
nsGkAtoms::body,
kNameSpaceID_XHTML,
(document->GetCompatibilityMode() ==
eCompatibility_NavQuirks),
aPreventScriptExecution);
}
return frag.forget();
}
AutoTArray<nsString, 32> tagStack;
nsAutoString uriStr, nameStr;
nsCOMPtr<nsIContent> content = do_QueryInterface(aContextNode);
// just in case we have a text node
if (content && !content->IsElement())
content = content->GetParent();
while (content && content->IsElement()) {
nsString& tagName = *tagStack.AppendElement();
tagName = content->NodeInfo()->QualifiedName();
// see if we need to add xmlns declarations
uint32_t count = content->AsElement()->GetAttrCount();
bool setDefaultNamespace = false;
if (count > 0) {
uint32_t index;
for (index = 0; index < count; index++) {
const BorrowedAttrInfo info = content->AsElement()->GetAttrInfoAt(index);
const nsAttrName* name = info.mName;
if (name->NamespaceEquals(kNameSpaceID_XMLNS)) {
info.mValue->ToString(uriStr);
// really want something like nsXMLContentSerializer::SerializeAttr
tagName.AppendLiteral(" xmlns"); // space important
if (name->GetPrefix()) {
tagName.Append(char16_t(':'));
name->LocalName()->ToString(nameStr);
tagName.Append(nameStr);
} else {
setDefaultNamespace = true;
}
tagName.AppendLiteral(R"(=")");
tagName.Append(uriStr);
tagName.Append('"');
}
}
}
if (!setDefaultNamespace) {
mozilla::dom::NodeInfo* info = content->NodeInfo();
if (!info->GetPrefixAtom() &&
info->NamespaceID() != kNameSpaceID_None) {
// We have no namespace prefix, but have a namespace ID. Push
// default namespace attr in, so that our kids will be in our
// namespace.
info->GetNamespaceURI(uriStr);
tagName.AppendLiteral(R"( xmlns=")");
tagName.Append(uriStr);
tagName.Append('"');
}
}
content = content->GetParent();
}
RefPtr<DocumentFragment> frag;
aRv = ParseFragmentXML(aFragment, document, tagStack,
aPreventScriptExecution, getter_AddRefs(frag));
return frag.forget();
}
/* static */
void
nsContentUtils::DropFragmentParsers()
{
NS_IF_RELEASE(sHTMLFragmentParser);
NS_IF_RELEASE(sXMLFragmentParser);
NS_IF_RELEASE(sXMLFragmentSink);
}
/* static */
void
nsContentUtils::XPCOMShutdown()
{
nsContentUtils::DropFragmentParsers();
}
/* static */
nsresult
nsContentUtils::ParseFragmentHTML(const nsAString& aSourceBuffer,
nsIContent* aTargetNode,
nsAtom* aContextLocalName,
int32_t aContextNamespace,
bool aQuirks,
bool aPreventScriptExecution)
{
AutoTimelineMarker m(aTargetNode->OwnerDoc()->GetDocShell(), "Parse HTML");
if (nsContentUtils::sFragmentParsingActive) {
MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted.");
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive);
nsContentUtils::sFragmentParsingActive = true;
if (!sHTMLFragmentParser) {
NS_ADDREF(sHTMLFragmentParser = new nsHtml5StringParser());
// Now sHTMLFragmentParser owns the object
}
nsIContent* target = aTargetNode;
// If this is a chrome-privileged document, create a fragment first, and
// sanitize it before insertion.
RefPtr<DocumentFragment> fragment;
if (IsSystemPrincipal(aTargetNode->NodePrincipal())) {
fragment = new DocumentFragment(aTargetNode->OwnerDoc()->NodeInfoManager());
target = fragment;
}
nsresult rv =
sHTMLFragmentParser->ParseFragment(aSourceBuffer,
target,
aContextLocalName,
aContextNamespace,
aQuirks,
aPreventScriptExecution);
NS_ENSURE_SUCCESS(rv, rv);
if (fragment) {
// Don't fire mutation events for nodes removed by the sanitizer.
nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker;
nsTreeSanitizer sanitizer(nsIParserUtils::SanitizerAllowStyle |
nsIParserUtils::SanitizerAllowComments |
nsIParserUtils::SanitizerDropForms |
nsIParserUtils::SanitizerLogRemovals);
sanitizer.Sanitize(fragment);
ErrorResult error;
aTargetNode->AppendChild(*fragment, error);
rv = error.StealNSResult();
}
return rv;
}
/* static */
nsresult
nsContentUtils::ParseDocumentHTML(const nsAString& aSourceBuffer,
nsIDocument* aTargetDocument,
bool aScriptingEnabledForNoscriptParsing)
{
AutoTimelineMarker m(aTargetDocument->GetDocShell(), "Parse HTML");
if (nsContentUtils::sFragmentParsingActive) {
MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted.");
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive);
nsContentUtils::sFragmentParsingActive = true;
if (!sHTMLFragmentParser) {
NS_ADDREF(sHTMLFragmentParser = new nsHtml5StringParser());
// Now sHTMLFragmentParser owns the object
}
nsresult rv =
sHTMLFragmentParser->ParseDocument(aSourceBuffer,
aTargetDocument,
aScriptingEnabledForNoscriptParsing);
return rv;
}
/* static */
nsresult
nsContentUtils::ParseFragmentXML(const nsAString& aSourceBuffer,
nsIDocument* aDocument,
nsTArray<nsString>& aTagStack,
bool aPreventScriptExecution,
DocumentFragment** aReturn)
{
AutoTimelineMarker m(aDocument->GetDocShell(), "Parse XML");
if (nsContentUtils::sFragmentParsingActive) {
MOZ_ASSERT_UNREACHABLE("Re-entrant fragment parsing attempted.");
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
mozilla::AutoRestore<bool> guard(nsContentUtils::sFragmentParsingActive);
nsContentUtils::sFragmentParsingActive = true;
if (!sXMLFragmentParser) {
nsCOMPtr<nsIParser> parser = do_CreateInstance(kCParserCID);
parser.forget(&sXMLFragmentParser);
// sXMLFragmentParser now owns the parser
}
if (!sXMLFragmentSink) {
NS_NewXMLFragmentContentSink(&sXMLFragmentSink);
// sXMLFragmentSink now owns the sink
}
nsCOMPtr<nsIContentSink> contentsink = do_QueryInterface(sXMLFragmentSink);
MOZ_ASSERT(contentsink, "Sink doesn't QI to nsIContentSink!");
sXMLFragmentParser->SetContentSink(contentsink);
sXMLFragmentSink->SetTargetDocument(aDocument);
sXMLFragmentSink->SetPreventScriptExecution(aPreventScriptExecution);
nsresult rv =
sXMLFragmentParser->ParseFragment(aSourceBuffer,
aTagStack);
if (NS_FAILED(rv)) {
// Drop the fragment parser and sink that might be in an inconsistent state
NS_IF_RELEASE(sXMLFragmentParser);
NS_IF_RELEASE(sXMLFragmentSink);
return rv;
}
rv = sXMLFragmentSink->FinishFragmentParsing(aReturn);
sXMLFragmentParser->Reset();
NS_ENSURE_SUCCESS(rv, rv);
// If this is a chrome-privileged document, sanitize the fragment before
// returning.
if (IsSystemPrincipal(aDocument->NodePrincipal())) {
// Don't fire mutation events for nodes removed by the sanitizer.
nsAutoScriptBlockerSuppressNodeRemoved scriptBlocker;
nsTreeSanitizer sanitizer(nsIParserUtils::SanitizerAllowStyle |
nsIParserUtils::SanitizerAllowComments |
nsIParserUtils::SanitizerDropForms |
nsIParserUtils::SanitizerLogRemovals);
sanitizer.Sanitize(*aReturn);
}
return rv;
}
/* static */
nsresult
nsContentUtils::ConvertToPlainText(const nsAString& aSourceBuffer,
nsAString& aResultBuffer,
uint32_t aFlags,
uint32_t aWrapCol)
{
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), "about:blank");
nsCOMPtr<nsIPrincipal> principal = NullPrincipal::CreateWithoutOriginAttributes();
nsCOMPtr<nsIDocument> document;
nsresult rv = NS_NewDOMDocument(getter_AddRefs(document),
EmptyString(),
EmptyString(),
nullptr,
uri,
uri,
principal,
true,
nullptr,
DocumentFlavorHTML);
NS_ENSURE_SUCCESS(rv, rv);
rv = nsContentUtils::ParseDocumentHTML(aSourceBuffer, document,
!(aFlags & nsIDocumentEncoder::OutputNoScriptContent));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDocumentEncoder> encoder = do_CreateInstance(
"@mozilla.org/layout/documentEncoder;1?type=text/plain");
rv = encoder->Init(document, NS_LITERAL_STRING("text/plain"), aFlags);
NS_ENSURE_SUCCESS(rv, rv);
encoder->SetWrapColumn(aWrapCol);
return encoder->EncodeToString(aResultBuffer);
}
/* static */
nsresult
nsContentUtils::SetNodeTextContent(nsIContent* aContent,
const nsAString& aValue,
bool aTryReuse)
{
// Fire DOMNodeRemoved mutation events before we do anything else.
nsCOMPtr<nsIContent> owningContent;
// Batch possible DOMSubtreeModified events.
mozAutoSubtreeModified subtree(nullptr, nullptr);
// Scope firing mutation events so that we don't carry any state that
// might be stale
{
// We're relying on mozAutoSubtreeModified to keep a strong reference if
// needed.
nsIDocument* doc = aContent->OwnerDoc();
// Optimize the common case of there being no observers
if (HasMutationListeners(doc, NS_EVENT_BITS_MUTATION_NODEREMOVED)) {
subtree.UpdateTarget(doc, nullptr);
owningContent = aContent;
nsCOMPtr<nsINode> child;
bool skipFirst = aTryReuse;
for (child = aContent->GetFirstChild();
child && child->GetParentNode() == aContent;
child = child->GetNextSibling()) {
if (skipFirst && child->IsText()) {
skipFirst = false;
continue;
}
nsContentUtils::MaybeFireNodeRemoved(child, aContent);
}
}
}
// Might as well stick a batch around this since we're performing several
// mutations.
mozAutoDocUpdate updateBatch(aContent->GetComposedDoc(), true);
nsAutoMutationBatch mb;
if (aTryReuse && !aValue.IsEmpty()) {
// Let's remove nodes until we find a eTEXT.
while (aContent->HasChildren()) {
nsIContent* child = aContent->GetFirstChild();
if (child->IsText()) {
break;
}
aContent->RemoveChildNode(child, true);
}
// If we have a node, it must be a eTEXT and we reuse it.
if (aContent->HasChildren()) {
nsIContent* child = aContent->GetFirstChild();
nsresult rv = child->AsText()->SetText(aValue, true);
NS_ENSURE_SUCCESS(rv, rv);
// All the following nodes, if they exist, must be deleted.
while (nsIContent* nextChild = child->GetNextSibling()) {
aContent->RemoveChildNode(nextChild, true);
}
}
if (aContent->HasChildren()) {
return NS_OK;
}
}
else {
mb.Init(aContent, true, false);
while (aContent->HasChildren()) {
aContent->RemoveChildNode(aContent->GetFirstChild(), true);
}
}
mb.RemovalDone();
if (aValue.IsEmpty()) {
return NS_OK;
}
RefPtr<nsTextNode> textContent =
new nsTextNode(aContent->NodeInfo()->NodeInfoManager());
textContent->SetText(aValue, true);
nsresult rv = aContent->AppendChildTo(textContent, true);
mb.NodesAdded();
return rv;
}
static bool
AppendNodeTextContentsRecurse(nsINode* aNode, nsAString& aResult,
const fallible_t& aFallible)
{
for (nsIContent* child = aNode->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child->IsElement()) {
bool ok = AppendNodeTextContentsRecurse(child, aResult,
aFallible);
if (!ok) {
return false;
}
}
else if (Text* text = child->GetAsText()) {
bool ok = text->AppendTextTo(aResult, aFallible);
if (!ok) {
return false;
}
}
}
return true;
}
/* static */
bool
nsContentUtils::AppendNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult,
const fallible_t& aFallible)
{
if (Text* text = aNode->GetAsText()) {
return text->AppendTextTo(aResult, aFallible);
}
if (aDeep) {
return AppendNodeTextContentsRecurse(aNode, aResult, aFallible);
}
for (nsIContent* child = aNode->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (Text* text = child->GetAsText()) {
bool ok = text->AppendTextTo(aResult, fallible);
if (!ok) {
return false;
}
}
}
return true;
}
bool
nsContentUtils::HasNonEmptyTextContent(nsINode* aNode,
TextContentDiscoverMode aDiscoverMode)
{
for (nsIContent* child = aNode->GetFirstChild();
child;
child = child->GetNextSibling()) {
if (child->IsText() &&
child->TextLength() > 0) {
return true;
}
if (aDiscoverMode == eRecurseIntoChildren &&
HasNonEmptyTextContent(child, aDiscoverMode)) {
return true;
}
}
return false;
}
/* static */
bool
nsContentUtils::IsInSameAnonymousTree(const nsINode* aNode,
const nsIContent* aContent)
{
MOZ_ASSERT(aNode, "Must have a node to work with");
MOZ_ASSERT(aContent, "Must have a content to work with");
if (!aNode->IsContent()) {
/**
* The root isn't an nsIContent, so it's a document or attribute. The only
* nodes in the same anonymous subtree as it will have a null
* bindingParent.
*
* XXXbz strictly speaking, that's not true for attribute nodes.
*/
return aContent->GetBindingParent() == nullptr;
}
return aNode->AsContent()->GetBindingParent() == aContent->GetBindingParent();
}
/* static */
void
nsContentUtils::NotifyInstalledMenuKeyboardListener(bool aInstalling)
{
IMEStateManager::OnInstalledMenuKeyboardListener(aInstalling);
}
/* static */ bool
nsContentUtils::SchemeIs(nsIURI* aURI, const char* aScheme)
{
nsCOMPtr<nsIURI> baseURI = NS_GetInnermostURI(aURI);
NS_ENSURE_TRUE(baseURI, false);
bool isScheme = false;
return NS_SUCCEEDED(baseURI->SchemeIs(aScheme, &isScheme)) && isScheme;
}
bool
nsContentUtils::IsSystemPrincipal(nsIPrincipal* aPrincipal)
{
MOZ_ASSERT(IsInitialized());
return aPrincipal == sSystemPrincipal;
}
bool
nsContentUtils::IsExpandedPrincipal(nsIPrincipal* aPrincipal)
{
nsCOMPtr<nsIExpandedPrincipal> ep = do_QueryInterface(aPrincipal);
return !!ep;
}
nsIPrincipal*
nsContentUtils::GetSystemPrincipal()
{
MOZ_ASSERT(IsInitialized());
return sSystemPrincipal;
}
bool
nsContentUtils::CombineResourcePrincipals(nsCOMPtr<nsIPrincipal>* aResourcePrincipal,
nsIPrincipal* aExtraPrincipal)
{
if (!aExtraPrincipal) {
return false;
}
if (!*aResourcePrincipal) {
*aResourcePrincipal = aExtraPrincipal;
return true;
}
if (*aResourcePrincipal == aExtraPrincipal) {
return false;
}
bool subsumes;
if (NS_SUCCEEDED((*aResourcePrincipal)->Subsumes(aExtraPrincipal, &subsumes)) &&
subsumes) {
return false;
}
*aResourcePrincipal = sSystemPrincipal;
return true;
}
/* static */
void
nsContentUtils::TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
nsIURI *aLinkURI, const nsString &aTargetSpec,
bool aClick, bool aIsTrusted)
{
NS_ASSERTION(aPresContext, "Need a nsPresContext");
MOZ_ASSERT(aLinkURI, "No link URI");
if (aContent->IsEditable()) {
return;
}
nsILinkHandler *handler = aPresContext->GetLinkHandler();
if (!handler) {
return;
}
if (!aClick) {
handler->OnOverLink(aContent, aLinkURI, aTargetSpec.get());
return;
}
// Check that this page is allowed to load this URI.
nsresult proceed = NS_OK;
if (sSecurityManager) {
uint32_t flag = static_cast<uint32_t>(nsIScriptSecurityManager::STANDARD);
proceed =
sSecurityManager->CheckLoadURIWithPrincipal(aContent->NodePrincipal(),
aLinkURI, flag);
}
// Only pass off the click event if the script security manager says it's ok.
// We need to rest aTargetSpec for forced downloads.
if (NS_SUCCEEDED(proceed)) {
// A link/area element with a download attribute is allowed to set
// a pseudo Content-Disposition header.
// For security reasons we only allow websites to declare same-origin resources
// as downloadable. If this check fails we will just do the normal thing
// (i.e. navigate to the resource).
nsAutoString fileName;
if ((!aContent->IsHTMLElement(nsGkAtoms::a) &&
!aContent->IsHTMLElement(nsGkAtoms::area) &&
!aContent->IsSVGElement(nsGkAtoms::a)) ||
!aContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::download, fileName) ||
NS_FAILED(aContent->NodePrincipal()->CheckMayLoad(aLinkURI, false, true))) {
fileName.SetIsVoid(true); // No actionable download attribute was found.
}
handler->OnLinkClick(aContent, aLinkURI,
fileName.IsVoid() ? aTargetSpec.get() : EmptyString().get(),
fileName, nullptr, nullptr, EventStateManager::IsHandlingUserInput(),
aIsTrusted, aContent->NodePrincipal());
}
}
/* static */
void
nsContentUtils::GetLinkLocation(Element* aElement, nsString& aLocationString)
{
nsCOMPtr<nsIURI> hrefURI = aElement->GetHrefURI();
if (hrefURI) {
nsAutoCString specUTF8;
nsresult rv = hrefURI->GetSpec(specUTF8);
if (NS_SUCCEEDED(rv))
CopyUTF8toUTF16(specUTF8, aLocationString);
}
}
/* static */
nsIWidget*
nsContentUtils::GetTopLevelWidget(nsIWidget* aWidget)
{
if (!aWidget)
return nullptr;
return aWidget->GetTopLevelWidget();
}
/* static */
const nsDependentString
nsContentUtils::GetLocalizedEllipsis()
{
static char16_t sBuf[4] = { 0, 0, 0, 0 };
if (!sBuf[0]) {
nsAutoString tmp;
Preferences::GetLocalizedString("intl.ellipsis", tmp);
uint32_t len = std::min(uint32_t(tmp.Length()),
uint32_t(ArrayLength(sBuf) - 1));
CopyUnicodeTo(tmp, 0, sBuf, len);
if (!sBuf[0])
sBuf[0] = char16_t(0x2026);
}
return nsDependentString(sBuf);
}
/* static */
void
nsContentUtils::AddScriptBlocker()
{
MOZ_ASSERT(NS_IsMainThread());
if (!sScriptBlockerCount) {
MOZ_ASSERT(sRunnersCountAtFirstBlocker == 0,
"Should not already have a count");
sRunnersCountAtFirstBlocker = sBlockedScriptRunners ? sBlockedScriptRunners->Length() : 0;
}
++sScriptBlockerCount;
}
#ifdef DEBUG
static bool sRemovingScriptBlockers = false;
#endif
/* static */
void
nsContentUtils::RemoveScriptBlocker()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!sRemovingScriptBlockers);
NS_ASSERTION(sScriptBlockerCount != 0, "Negative script blockers");
--sScriptBlockerCount;
if (sScriptBlockerCount) {
return;
}
if (!sBlockedScriptRunners) {
return;
}
uint32_t firstBlocker = sRunnersCountAtFirstBlocker;
uint32_t lastBlocker = sBlockedScriptRunners->Length();
uint32_t originalFirstBlocker = firstBlocker;
uint32_t blockersCount = lastBlocker - firstBlocker;
sRunnersCountAtFirstBlocker = 0;
NS_ASSERTION(firstBlocker <= lastBlocker,
"bad sRunnersCountAtFirstBlocker");
while (firstBlocker < lastBlocker) {
nsCOMPtr<nsIRunnable> runnable;
runnable.swap((*sBlockedScriptRunners)[firstBlocker]);
++firstBlocker;
// Calling the runnable can reenter us
runnable->Run();
// So can dropping the reference to the runnable
runnable = nullptr;
NS_ASSERTION(sRunnersCountAtFirstBlocker == 0,
"Bad count");
NS_ASSERTION(!sScriptBlockerCount, "This is really bad");
}
#ifdef DEBUG
AutoRestore<bool> removingScriptBlockers(sRemovingScriptBlockers);
sRemovingScriptBlockers = true;
#endif
sBlockedScriptRunners->RemoveElementsAt(originalFirstBlocker, blockersCount);
}
/* static */
nsIWindowProvider*
nsContentUtils::GetWindowProviderForContentProcess()
{
MOZ_ASSERT(XRE_IsContentProcess());
return ContentChild::GetSingleton();
}
/* static */
already_AddRefed<nsPIDOMWindowOuter>
nsContentUtils::GetMostRecentNonPBWindow()
{
nsCOMPtr<nsIWindowMediator> wm = do_GetService(NS_WINDOWMEDIATOR_CONTRACTID);
nsCOMPtr<mozIDOMWindowProxy> window;
wm->GetMostRecentNonPBWindow(u"navigator:browser",
getter_AddRefs(window));
nsCOMPtr<nsPIDOMWindowOuter> pwindow;
pwindow = do_QueryInterface(window);
return pwindow.forget();
}
/* static */
void
nsContentUtils::WarnScriptWasIgnored(nsIDocument* aDocument)
{
nsAutoString msg;
bool privateBrowsing = false;
if (aDocument) {
nsCOMPtr<nsIURI> uri = aDocument->GetDocumentURI();
if (uri) {
msg.Append(NS_ConvertUTF8toUTF16(uri->GetSpecOrDefault()));
msg.AppendLiteral(" : ");
}
privateBrowsing =
!!aDocument->NodePrincipal()->OriginAttributesRef().mPrivateBrowsingId;
}
msg.AppendLiteral("Unable to run script because scripts are blocked internally.");
LogSimpleConsoleError(msg, "DOM", privateBrowsing);
}
/* static */
void
nsContentUtils::AddScriptRunner(already_AddRefed<nsIRunnable> aRunnable)
{
nsCOMPtr<nsIRunnable> runnable = aRunnable;
if (!runnable) {
return;
}
if (sScriptBlockerCount) {
sBlockedScriptRunners->AppendElement(runnable.forget());
return;
}
runnable->Run();
}
/* static */
void
nsContentUtils::AddScriptRunner(nsIRunnable* aRunnable) {
nsCOMPtr<nsIRunnable> runnable = aRunnable;
AddScriptRunner(runnable.forget());
}
/* static */
void
nsContentUtils::RunInStableState(already_AddRefed<nsIRunnable> aRunnable)
{
MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!");
CycleCollectedJSContext::Get()->RunInStableState(std::move(aRunnable));
}
/* static */
void
nsContentUtils::AddPendingIDBTransaction(already_AddRefed<nsIRunnable> aTransaction)
{
MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!");
CycleCollectedJSContext::Get()->AddPendingIDBTransaction(std::move(aTransaction));
}
/* static */
bool
nsContentUtils::IsInStableOrMetaStableState()
{
MOZ_ASSERT(CycleCollectedJSContext::Get(), "Must be on a script thread!");
return CycleCollectedJSContext::Get()->IsInStableOrMetaStableState();
}
/*
* Helper function for nsContentUtils::ProcessViewportInfo.
*
* Handles a single key=value pair. If it corresponds to a valid viewport
* attribute, add it to the document header data. No validation is done on the
* value itself (this is done at display time).
*/
static void ProcessViewportToken(nsIDocument *aDocument,
const nsAString &token) {
/* Iterators. */
nsAString::const_iterator tip, tail, end;
token.BeginReading(tip);
tail = tip;
token.EndReading(end);
/* Move tip to the '='. */
while ((tip != end) && (*tip != '='))
++tip;
/* If we didn't find an '=', punt. */
if (tip == end)
return;
/* Extract the key and value. */
const nsAString &key =
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(Substring(tail, tip),
true);
const nsAString &value =
nsContentUtils::TrimWhitespace<nsCRT::IsAsciiSpace>(Substring(++tip, end),
true);
/* Check for known keys. If we find a match, insert the appropriate
* information into the document header. */
RefPtr<nsAtom> key_atom = NS_Atomize(key);
if (key_atom == nsGkAtoms::height)
aDocument->SetHeaderData(nsGkAtoms::viewport_height, value);
else if (key_atom == nsGkAtoms::width)
aDocument->SetHeaderData(nsGkAtoms::viewport_width, value);
else if (key_atom == nsGkAtoms::initial_scale)
aDocument->SetHeaderData(nsGkAtoms::viewport_initial_scale, value);
else if (key_atom == nsGkAtoms::minimum_scale)
aDocument->SetHeaderData(nsGkAtoms::viewport_minimum_scale, value);
else if (key_atom == nsGkAtoms::maximum_scale)
aDocument->SetHeaderData(nsGkAtoms::viewport_maximum_scale, value);
else if (key_atom == nsGkAtoms::user_scalable)
aDocument->SetHeaderData(nsGkAtoms::viewport_user_scalable, value);
}
#define IS_SEPARATOR(c) ((c == '=') || (c == ',') || (c == ';') || \
(c == '\t') || (c == '\n') || (c == '\r'))
/* static */
nsresult
nsContentUtils::ProcessViewportInfo(nsIDocument *aDocument,
const nsAString &viewportInfo) {
/* We never fail. */
nsresult rv = NS_OK;
aDocument->SetHeaderData(nsGkAtoms::viewport, viewportInfo);
/* Iterators. */
nsAString::const_iterator tip, tail, end;
viewportInfo.BeginReading(tip);
tail = tip;
viewportInfo.EndReading(end);
/* Read the tip to the first non-separator character. */
while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip)))
++tip;
/* Read through and find tokens separated by separators. */
while (tip != end) {
/* Synchronize tip and tail. */
tail = tip;
/* Advance tip past non-separator characters. */
while ((tip != end) && !IS_SEPARATOR(*tip))
++tip;
/* Allow white spaces that surround the '=' character */
if ((tip != end) && (*tip == '=')) {
++tip;
while ((tip != end) && nsCRT::IsAsciiSpace(*tip))
++tip;
while ((tip != end) && !(IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip)))
++tip;
}
/* Our token consists of the characters between tail and tip. */
ProcessViewportToken(aDocument, Substring(tail, tip));
/* Skip separators. */
while ((tip != end) && (IS_SEPARATOR(*tip) || nsCRT::IsAsciiSpace(*tip)))
++tip;
}
return rv;
}
#undef IS_SEPARATOR
/* static */
void
nsContentUtils::HidePopupsInDocument(nsIDocument* aDocument)
{
#ifdef MOZ_XUL
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm && aDocument) {
nsCOMPtr<nsIDocShellTreeItem> docShellToHide = aDocument->GetDocShell();
if (docShellToHide)
pm->HidePopupsInDocShell(docShellToHide);
}
#endif
}
/* static */
already_AddRefed<nsIDragSession>
nsContentUtils::GetDragSession()
{
nsCOMPtr<nsIDragSession> dragSession;
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (dragService)
dragService->GetCurrentSession(getter_AddRefs(dragSession));
return dragSession.forget();
}
/* static */
nsresult
nsContentUtils::SetDataTransferInEvent(WidgetDragEvent* aDragEvent)
{
if (aDragEvent->mDataTransfer || !aDragEvent->IsTrusted()) {
return NS_OK;
}
// For dragstart events, the data transfer object is
// created before the event fires, so it should already be set. For other
// drag events, get the object from the drag session.
NS_ASSERTION(aDragEvent->mMessage != eDragStart,
"draggesture event created without a dataTransfer");
nsCOMPtr<nsIDragSession> dragSession = GetDragSession();
NS_ENSURE_TRUE(dragSession, NS_OK); // no drag in progress
RefPtr<DataTransfer> initialDataTransfer =
dragSession->GetDataTransfer();
if (!initialDataTransfer) {
// A dataTransfer won't exist when a drag was started by some other
// means, for instance calling the drag service directly, or a drag
// from another application. In either case, a new dataTransfer should
// be created that reflects the data.
initialDataTransfer =
new DataTransfer(aDragEvent->mTarget, aDragEvent->mMessage, true, -1);
// now set it in the drag session so we don't need to create it again
dragSession->SetDataTransfer(initialDataTransfer);
}
bool isCrossDomainSubFrameDrop = false;
if (aDragEvent->mMessage == eDrop) {
isCrossDomainSubFrameDrop = CheckForSubFrameDrop(dragSession, aDragEvent);
}
// each event should use a clone of the original dataTransfer.
initialDataTransfer->Clone(aDragEvent->mTarget, aDragEvent->mMessage,
aDragEvent->mUserCancelled,
isCrossDomainSubFrameDrop,
getter_AddRefs(aDragEvent->mDataTransfer));
if (NS_WARN_IF(!aDragEvent->mDataTransfer)) {
return NS_ERROR_OUT_OF_MEMORY;
}
// for the dragenter and dragover events, initialize the drop effect
// from the drop action, which platform specific widget code sets before
// the event is fired based on the keyboard state.
if (aDragEvent->mMessage == eDragEnter || aDragEvent->mMessage == eDragOver) {
uint32_t action;
dragSession->GetDragAction(&action);
uint32_t effectAllowed = aDragEvent->mDataTransfer->EffectAllowedInt();
aDragEvent->mDataTransfer->SetDropEffectInt(
FilterDropEffect(action, effectAllowed));
}
else if (aDragEvent->mMessage == eDrop ||
aDragEvent->mMessage == eDragEnd) {
// For the drop and dragend events, set the drop effect based on the
// last value that the dropEffect had. This will have been set in
// EventStateManager::PostHandleEvent for the last dragenter or
// dragover event.
aDragEvent->mDataTransfer->SetDropEffectInt(
initialDataTransfer->DropEffectInt());
}
return NS_OK;
}
/* static */
uint32_t
nsContentUtils::FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed)
{
// It is possible for the drag action to include more than one action, but
// the widget code which sets the action from the keyboard state should only
// be including one. If multiple actions were set, we just consider them in
// the following order:
// copy, link, move
if (aAction & nsIDragService::DRAGDROP_ACTION_COPY)
aAction = nsIDragService::DRAGDROP_ACTION_COPY;
else if (aAction & nsIDragService::DRAGDROP_ACTION_LINK)
aAction = nsIDragService::DRAGDROP_ACTION_LINK;
else if (aAction & nsIDragService::DRAGDROP_ACTION_MOVE)
aAction = nsIDragService::DRAGDROP_ACTION_MOVE;
// Filter the action based on the effectAllowed. If the effectAllowed
// doesn't include the action, then that action cannot be done, so adjust
// the action to something that is allowed. For a copy, adjust to move or
// link. For a move, adjust to copy or link. For a link, adjust to move or
// link. Otherwise, use none.
if (aAction & aEffectAllowed ||
aEffectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED)
return aAction;
if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_MOVE)
return nsIDragService::DRAGDROP_ACTION_MOVE;
if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_COPY)
return nsIDragService::DRAGDROP_ACTION_COPY;
if (aEffectAllowed & nsIDragService::DRAGDROP_ACTION_LINK)
return nsIDragService::DRAGDROP_ACTION_LINK;
return nsIDragService::DRAGDROP_ACTION_NONE;
}
/* static */
bool
nsContentUtils::CheckForSubFrameDrop(nsIDragSession* aDragSession,
WidgetDragEvent* aDropEvent)
{
nsCOMPtr<nsIContent> target = do_QueryInterface(aDropEvent->mOriginalTarget);
if (!target) {
return true;
}
nsIDocument* targetDoc = target->OwnerDoc();
nsPIDOMWindowOuter* targetWin = targetDoc->GetWindow();
if (!targetWin) {
return true;
}
nsCOMPtr<nsIDocShellTreeItem> tdsti = targetWin->GetDocShell();
if (!tdsti) {
return true;
}
// Always allow dropping onto chrome shells.
if (tdsti->ItemType() == nsIDocShellTreeItem::typeChrome) {
return false;
}
// If there is no source node, then this is a drag from another
// application, which should be allowed.
nsCOMPtr<nsIDocument> doc;
aDragSession->GetSourceDocument(getter_AddRefs(doc));
if (doc) {
// Get each successive parent of the source document and compare it to
// the drop document. If they match, then this is a drag from a child frame.
do {
doc = doc->GetParentDocument();
if (doc == targetDoc) {
// The drag is from a child frame.
return true;
}
} while (doc);
}
return false;
}
/* static */
bool
nsContentUtils::URIIsLocalFile(nsIURI *aURI)
{
bool isFile;
nsCOMPtr<nsINetUtil> util = do_QueryInterface(sIOService);
// Important: we do NOT test the entire URI chain here!
return util && NS_SUCCEEDED(util->ProtocolHasFlags(aURI,
nsIProtocolHandler::URI_IS_LOCAL_FILE,
&isFile)) &&
isFile;
}
/* static */
JSContext *
nsContentUtils::GetCurrentJSContext()
{
MOZ_ASSERT(IsInitialized());
if (!IsJSAPIActive()) {
return nullptr;
}
return danger::GetJSContext();
}
template<typename StringType, typename CharType>
void
_ASCIIToLowerInSitu(StringType& aStr)
{
CharType* iter = aStr.BeginWriting();
CharType* end = aStr.EndWriting();
MOZ_ASSERT(iter && end);
while (iter != end) {
CharType c = *iter;
if (c >= 'A' && c <= 'Z') {
*iter = c + ('a' - 'A');
}
++iter;
}
}
/* static */
void
nsContentUtils::ASCIIToLower(nsAString& aStr)
{
return _ASCIIToLowerInSitu<nsAString, char16_t>(aStr);
}
/* static */
void
nsContentUtils::ASCIIToLower(nsACString& aStr)
{
return _ASCIIToLowerInSitu<nsACString, char>(aStr);
}
template<typename StringType, typename CharType>
void
_ASCIIToLowerCopy(const StringType& aSource, StringType& aDest)
{
uint32_t len = aSource.Length();
aDest.SetLength(len);
MOZ_ASSERT(aDest.Length() == len);
CharType* dest = aDest.BeginWriting();
MOZ_ASSERT(dest);
const CharType* iter = aSource.BeginReading();
const CharType* end = aSource.EndReading();
while (iter != end) {
CharType c = *iter;
*dest = (c >= 'A' && c <= 'Z') ?
c + ('a' - 'A') : c;
++iter;
++dest;
}
}
/* static */
void
nsContentUtils::ASCIIToLower(const nsAString& aSource, nsAString& aDest) {
return _ASCIIToLowerCopy<nsAString, char16_t>(aSource, aDest);
}
/* static */
void
nsContentUtils::ASCIIToLower(const nsACString& aSource, nsACString& aDest) {
return _ASCIIToLowerCopy<nsACString, char>(aSource, aDest);
}
template<typename StringType, typename CharType>
void
_ASCIIToUpperInSitu(StringType& aStr)
{
CharType* iter = aStr.BeginWriting();
CharType* end = aStr.EndWriting();
MOZ_ASSERT(iter && end);
while (iter != end) {
CharType c = *iter;
if (c >= 'a' && c <= 'z') {
*iter = c + ('A' - 'a');
}
++iter;
}
}
/* static */
void
nsContentUtils::ASCIIToUpper(nsAString& aStr)
{
return _ASCIIToUpperInSitu<nsAString, char16_t>(aStr);
}
/* static */
void
nsContentUtils::ASCIIToUpper(nsACString& aStr)
{
return _ASCIIToUpperInSitu<nsACString, char>(aStr);
}
template<typename StringType, typename CharType>
void
_ASCIIToUpperCopy(const StringType& aSource, StringType& aDest)
{
uint32_t len = aSource.Length();
aDest.SetLength(len);
MOZ_ASSERT(aDest.Length() == len);
CharType* dest = aDest.BeginWriting();
MOZ_ASSERT(dest);
const CharType* iter = aSource.BeginReading();
const CharType* end = aSource.EndReading();
while (iter != end) {
CharType c = *iter;
*dest = (c >= 'a' && c <= 'z') ?
c + ('A' - 'a') : c;
++iter;
++dest;
}
}
/* static */
void
nsContentUtils::ASCIIToUpper(const nsAString& aSource, nsAString& aDest)
{
return _ASCIIToUpperCopy<nsAString, char16_t>(aSource, aDest);
}
/* static */
void
nsContentUtils::ASCIIToUpper(const nsACString& aSource, nsACString& aDest)
{
return _ASCIIToUpperCopy<nsACString, char>(aSource, aDest);
}
/* static */
bool
nsContentUtils::EqualsIgnoreASCIICase(const nsAString& aStr1,
const nsAString& aStr2)
{
uint32_t len = aStr1.Length();
if (len != aStr2.Length()) {
return false;
}
const char16_t* str1 = aStr1.BeginReading();
const char16_t* str2 = aStr2.BeginReading();
const char16_t* end = str1 + len;
while (str1 < end) {
char16_t c1 = *str1++;
char16_t c2 = *str2++;
// First check if any bits other than the 0x0020 differs
if ((c1 ^ c2) & 0xffdf) {
return false;
}
// We know they can only differ in the 0x0020 bit.
// Likely the two chars are the same, so check that first
if (c1 != c2) {
// They do differ, but since it's only in the 0x0020 bit, check if it's
// the same ascii char, but just differing in case
char16_t c1Upper = c1 & 0xffdf;
if (!('A' <= c1Upper && c1Upper <= 'Z')) {
return false;
}
}
}
return true;
}
/* static */
bool
nsContentUtils::StringContainsASCIIUpper(const nsAString& aStr)
{
const char16_t* iter = aStr.BeginReading();
const char16_t* end = aStr.EndReading();
while (iter != end) {
char16_t c = *iter;
if (c >= 'A' && c <= 'Z') {
return true;
}
++iter;
}
return false;
}
/* static */
nsIInterfaceRequestor*
nsContentUtils::SameOriginChecker()
{
if (!sSameOriginChecker) {
sSameOriginChecker = new SameOriginCheckerImpl();
NS_ADDREF(sSameOriginChecker);
}
return sSameOriginChecker;
}
/* static */
nsresult
nsContentUtils::CheckSameOrigin(nsIChannel *aOldChannel, nsIChannel *aNewChannel)
{
if (!nsContentUtils::GetSecurityManager())
return NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIPrincipal> oldPrincipal;
nsContentUtils::GetSecurityManager()->
GetChannelResultPrincipal(aOldChannel, getter_AddRefs(oldPrincipal));
nsCOMPtr<nsIURI> newURI;
aNewChannel->GetURI(getter_AddRefs(newURI));
nsCOMPtr<nsIURI> newOriginalURI;
aNewChannel->GetOriginalURI(getter_AddRefs(newOriginalURI));
NS_ENSURE_STATE(oldPrincipal && newURI && newOriginalURI);
nsresult rv = oldPrincipal->CheckMayLoad(newURI, false, false);
if (NS_SUCCEEDED(rv) && newOriginalURI != newURI) {
rv = oldPrincipal->CheckMayLoad(newOriginalURI, false, false);
}
return rv;
}
NS_IMPL_ISUPPORTS(SameOriginCheckerImpl,
nsIChannelEventSink,
nsIInterfaceRequestor)
NS_IMETHODIMP
SameOriginCheckerImpl::AsyncOnChannelRedirect(nsIChannel* aOldChannel,
nsIChannel* aNewChannel,
uint32_t aFlags,
nsIAsyncVerifyRedirectCallback* cb)
{
MOZ_ASSERT(aNewChannel, "Redirecting to null channel?");
nsresult rv = nsContentUtils::CheckSameOrigin(aOldChannel, aNewChannel);
if (NS_SUCCEEDED(rv)) {
cb->OnRedirectVerifyCallback(NS_OK);
}
return rv;
}
NS_IMETHODIMP
SameOriginCheckerImpl::GetInterface(const nsIID& aIID, void** aResult)
{
return QueryInterface(aIID, aResult);
}
/* static */
nsresult
nsContentUtils::GetASCIIOrigin(nsIPrincipal* aPrincipal, nsACString& aOrigin)
{
MOZ_ASSERT(aPrincipal, "missing principal");
aOrigin.Truncate();
nsCOMPtr<nsIURI> uri;
nsresult rv = aPrincipal->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
if (uri) {
return GetASCIIOrigin(uri, aOrigin);
}
aOrigin.AssignLiteral("null");
return NS_OK;
}
/* static */
nsresult
nsContentUtils::GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin)
{
MOZ_ASSERT(aURI, "missing uri");
bool isBlobURL = false;
nsresult rv = aURI->SchemeIs(BLOBURI_SCHEME, &isBlobURL);
NS_ENSURE_SUCCESS(rv, rv);
// For Blob URI, the path is the URL of the owning page.
if (isBlobURL) {
nsAutoCString path;
rv = aURI->GetPathQueryRef(path);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), path);
if (NS_FAILED(rv)) {
aOrigin.AssignLiteral("null");
return NS_OK;
}
return GetASCIIOrigin(uri, aOrigin);
}
aOrigin.Truncate();
nsCOMPtr<nsIURI> uri = NS_GetInnermostURI(aURI);
NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED);
nsCString host;
rv = uri->GetAsciiHost(host);
if (NS_SUCCEEDED(rv) && !host.IsEmpty()) {
nsCString scheme;
rv = uri->GetScheme(scheme);
NS_ENSURE_SUCCESS(rv, rv);
int32_t port = -1;
uri->GetPort(&port);
if (port != -1 && port == NS_GetDefaultPort(scheme.get()))
port = -1;
nsCString hostPort;
rv = NS_GenerateHostPort(host, port, hostPort);
NS_ENSURE_SUCCESS(rv, rv);
aOrigin = scheme + NS_LITERAL_CSTRING("://") + hostPort;
}
else {
aOrigin.AssignLiteral("null");
}
return NS_OK;
}
/* static */
nsresult
nsContentUtils::GetUTFOrigin(nsIPrincipal* aPrincipal, nsAString& aOrigin)
{
MOZ_ASSERT(aPrincipal, "missing principal");
aOrigin.Truncate();
nsCOMPtr<nsIURI> uri;
nsresult rv = aPrincipal->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, rv);
if (uri) {
return GetUTFOrigin(uri, aOrigin);
}
aOrigin.AssignLiteral("null");
return NS_OK;
}
/* static */
nsresult
nsContentUtils::GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin)
{
MOZ_ASSERT(aURI, "missing uri");
nsresult rv;
#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
// Check if either URI has a special origin.
nsCOMPtr<nsIURIWithSpecialOrigin> uriWithSpecialOrigin = do_QueryInterface(aURI);
if (uriWithSpecialOrigin) {
nsCOMPtr<nsIURI> origin;
rv = uriWithSpecialOrigin->GetOrigin(getter_AddRefs(origin));
NS_ENSURE_SUCCESS(rv, rv);
return GetUTFOrigin(origin, aOrigin);
}
#endif
bool isBlobURL = false;
rv = aURI->SchemeIs(BLOBURI_SCHEME, &isBlobURL);
NS_ENSURE_SUCCESS(rv, rv);
// For Blob URI, the path is the URL of the owning page.
if (isBlobURL) {
nsAutoCString path;
rv = aURI->GetPathQueryRef(path);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), path);
if (NS_FAILED(rv)) {
aOrigin.AssignLiteral("null");
return NS_OK;
}
return GetUTFOrigin(uri, aOrigin);
}
aOrigin.Truncate();
nsCOMPtr<nsIURI> uri = NS_GetInnermostURI(aURI);
NS_ENSURE_TRUE(uri, NS_ERROR_UNEXPECTED);
nsCString host;
rv = uri->GetHost(host);
if (NS_SUCCEEDED(rv) && !host.IsEmpty()) {
nsCString scheme;
rv = uri->GetScheme(scheme);
NS_ENSURE_SUCCESS(rv, rv);
int32_t port = -1;
uri->GetPort(&port);
if (port != -1 && port == NS_GetDefaultPort(scheme.get()))
port = -1;
nsCString hostPort;
rv = NS_GenerateHostPort(host, port, hostPort);
NS_ENSURE_SUCCESS(rv, rv);
aOrigin = NS_ConvertUTF8toUTF16(
scheme + NS_LITERAL_CSTRING("://") + hostPort);
}
else {
aOrigin.AssignLiteral("null");
}
return NS_OK;
}
/* static */
bool
nsContentUtils::CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, bool aAllowIfInheritsPrincipal)
{
nsCOMPtr<nsIURI> channelURI;
nsresult rv = NS_GetFinalChannelURI(aChannel, getter_AddRefs(channelURI));
NS_ENSURE_SUCCESS(rv, false);
return NS_SUCCEEDED(aPrincipal->CheckMayLoad(channelURI, false, aAllowIfInheritsPrincipal));
}
/* static */
bool
nsContentUtils::CanAccessNativeAnon()
{
return LegacyIsCallerChromeOrNativeCode() || IsCallerContentXBL();
}
/* static */ nsresult
nsContentUtils::DispatchXULCommand(nsIContent* aTarget,
bool aTrusted,
Event* aSourceEvent,
nsIPresShell* aShell,
bool aCtrl,
bool aAlt,
bool aShift,
bool aMeta,
uint16_t aInputSource)
{
NS_ENSURE_STATE(aTarget);
nsIDocument* doc = aTarget->OwnerDoc();
nsPresContext* presContext = doc->GetPresContext();
RefPtr<XULCommandEvent> xulCommand = new XULCommandEvent(doc, presContext,
nullptr);
xulCommand->InitCommandEvent(NS_LITERAL_STRING("command"), true, true,
nsGlobalWindowInner::Cast(doc->GetInnerWindow()),
0, aCtrl, aAlt, aShift,
aMeta,
aSourceEvent,
aInputSource, IgnoreErrors());
if (aShell) {
nsEventStatus status = nsEventStatus_eIgnore;
nsCOMPtr<nsIPresShell> kungFuDeathGrip = aShell;
return aShell->HandleDOMEventWithTarget(aTarget, xulCommand, &status);
}
ErrorResult rv;
aTarget->DispatchEvent(*xulCommand, rv);
return rv.StealNSResult();
}
// static
nsresult
nsContentUtils::WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache, const nsIID* aIID,
JS::MutableHandle<JS::Value> vp, bool aAllowWrapping)
{
MOZ_ASSERT(cx == GetCurrentJSContext());
if (!native) {
vp.setNull();
return NS_OK;
}
JSObject *wrapper = xpc_FastGetCachedWrapper(cx, cache, vp);
if (wrapper) {
return NS_OK;
}
NS_ENSURE_TRUE(sXPConnect, NS_ERROR_UNEXPECTED);
if (!NS_IsMainThread()) {
MOZ_CRASH();
}
JS::Rooted<JSObject*> scope(cx, JS::CurrentGlobalOrNull(cx));
nsresult rv = sXPConnect->WrapNativeToJSVal(cx, scope, native, cache, aIID,
aAllowWrapping, vp);
return rv;
}
nsresult
nsContentUtils::CreateArrayBuffer(JSContext *aCx, const nsACString& aData,
JSObject** aResult)
{
if (!aCx) {
return NS_ERROR_FAILURE;
}
int32_t dataLen = aData.Length();
*aResult = JS_NewArrayBuffer(aCx, dataLen);
if (!*aResult) {
return NS_ERROR_FAILURE;
}
if (dataLen > 0) {
NS_ASSERTION(JS_IsArrayBufferObject(*aResult), "What happened?");
JS::AutoCheckCannotGC nogc;
bool isShared;
memcpy(JS_GetArrayBufferData(*aResult, &isShared, nogc), aData.BeginReading(), dataLen);
MOZ_ASSERT(!isShared);
}
return NS_OK;
}
void
nsContentUtils::StripNullChars(const nsAString& aInStr, nsAString& aOutStr)
{
// In common cases where we don't have nulls in the
// string we can simple simply bypass the checking code.
int32_t firstNullPos = aInStr.FindChar('\0');
if (firstNullPos == kNotFound) {
aOutStr.Assign(aInStr);
return;
}
aOutStr.SetCapacity(aInStr.Length() - 1);
nsAString::const_iterator start, end;
aInStr.BeginReading(start);
aInStr.EndReading(end);
while (start != end) {
if (*start != '\0')
aOutStr.Append(*start);
++start;
}
}
struct ClassMatchingInfo {
AtomArray mClasses;
nsCaseTreatment mCaseTreatment;
};
// static
bool
nsContentUtils::MatchClassNames(Element* aElement, int32_t aNamespaceID,
nsAtom* aAtom, void* aData)
{
// We can't match if there are no class names
const nsAttrValue* classAttr = aElement->GetClasses();
if (!classAttr) {
return false;
}
// need to match *all* of the classes
ClassMatchingInfo* info = static_cast<ClassMatchingInfo*>(aData);
uint32_t length = info->mClasses.Length();
if (!length) {
// If we actually had no classes, don't match.
return false;
}
uint32_t i;
for (i = 0; i < length; ++i) {
if (!classAttr->Contains(info->mClasses[i],
info->mCaseTreatment)) {
return false;
}
}
return true;
}
// static
void
nsContentUtils::DestroyClassNameArray(void* aData)
{
ClassMatchingInfo* info = static_cast<ClassMatchingInfo*>(aData);
delete info;
}
// static
void*
nsContentUtils::AllocClassMatchingInfo(nsINode* aRootNode,
const nsString* aClasses)
{
nsAttrValue attrValue;
attrValue.ParseAtomArray(*aClasses);
// nsAttrValue::Equals is sensitive to order, so we'll send an array
auto* info = new ClassMatchingInfo;
if (attrValue.Type() == nsAttrValue::eAtomArray) {
info->mClasses.SwapElements(*(attrValue.GetAtomArrayValue()));
} else if (attrValue.Type() == nsAttrValue::eAtom) {
info->mClasses.AppendElement(attrValue.GetAtomValue());
}
info->mCaseTreatment =
aRootNode->OwnerDoc()->GetCompatibilityMode() == eCompatibility_NavQuirks ?
eIgnoreCase : eCaseMatters;
return info;
}
// static
bool
nsContentUtils::IsFocusedContent(const nsIContent* aContent)
{
nsFocusManager* fm = nsFocusManager::GetFocusManager();
return fm && fm->GetFocusedElement() == aContent;
}
bool
nsContentUtils::IsSubDocumentTabbable(nsIContent* aContent)
{
nsIDocument* doc = aContent->GetComposedDoc();
if (!doc) {
return false;
}
// If the subdocument lives in another process, the frame is
// tabbable.
if (EventStateManager::IsRemoteTarget(aContent)) {
return true;
}
// XXXbz should this use OwnerDoc() for GetSubDocumentFor?
// sXBL/XBL2 issue!
nsIDocument* subDoc = doc->GetSubDocumentFor(aContent);
if (!subDoc) {
return false;
}
nsCOMPtr<nsIDocShell> docShell = subDoc->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsIContentViewer> contentViewer;
docShell->GetContentViewer(getter_AddRefs(contentViewer));
if (!contentViewer) {
return false;
}
nsCOMPtr<nsIContentViewer> zombieViewer;
contentViewer->GetPreviousViewer(getter_AddRefs(zombieViewer));
// If there are 2 viewers for the current docshell, that
// means the current document may be a zombie document.
// While load and pageshow events are dispatched, zombie viewer is the old,
// to be hidden document.
if (zombieViewer) {
bool inOnLoad = false;
docShell->GetIsExecutingOnLoadHandler(&inOnLoad);
return inOnLoad;
}
return true;
}
bool
nsContentUtils::IsUserFocusIgnored(nsINode* aNode)
{
if (!nsGenericHTMLFrameElement::BrowserFramesEnabled()) {
return false;
}
// Check if our mozbrowser iframe ancestors has ignoreuserfocus attribute.
while (aNode) {
nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(aNode);
if (browserFrame &&
aNode->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::ignoreuserfocus) &&
browserFrame->GetReallyIsBrowser()) {
return true;
}
nsPIDOMWindowOuter* win = aNode->OwnerDoc()->GetWindow();
aNode = win ? win->GetFrameElementInternal() : nullptr;
}
return false;
}
bool
nsContentUtils::HasScrollgrab(nsIContent* aContent)
{
// If we ever standardize this feature we'll want to hook this up properly
// again. For now we're removing all the DOM-side code related to it but
// leaving the layout and APZ handling for it in place.
return false;
}
void
nsContentUtils::FlushLayoutForTree(nsPIDOMWindowOuter* aWindow)
{
if (!aWindow) {
return;
}
// Note that because FlushPendingNotifications flushes parents, this
// is O(N^2) in docshell tree depth. However, the docshell tree is
// usually pretty shallow.
if (nsCOMPtr<nsIDocument> doc = aWindow->GetDoc()) {
doc->FlushPendingNotifications(FlushType::Layout);
}
if (nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell()) {
int32_t i = 0, i_end;
docShell->GetChildCount(&i_end);
for (; i < i_end; ++i) {
nsCOMPtr<nsIDocShellTreeItem> item;
if (docShell->GetChildAt(i, getter_AddRefs(item)) == NS_OK && item) {
if (nsCOMPtr<nsPIDOMWindowOuter> win = item->GetWindow()) {
FlushLayoutForTree(win);
}
}
}
}
}
void nsContentUtils::RemoveNewlines(nsString &aString)
{
aString.StripCRLF();
}
void
nsContentUtils::PlatformToDOMLineBreaks(nsString &aString)
{
if (!PlatformToDOMLineBreaks(aString, fallible)) {
aString.AllocFailed(aString.Length());
}
}
bool
nsContentUtils::PlatformToDOMLineBreaks(nsString& aString, const fallible_t& aFallible)
{
if (aString.FindChar(char16_t('\r')) != -1) {
// Windows linebreaks: Map CRLF to LF:
if (!aString.ReplaceSubstring(u"\r\n", u"\n", aFallible)) {
return false;
}
// Mac linebreaks: Map any remaining CR to LF:
if (!aString.ReplaceSubstring(u"\r", u"\n", aFallible)) {
return false;
}
}
return true;
}
void
nsContentUtils::PopulateStringFromStringBuffer(nsStringBuffer* aBuf,
nsAString& aResultString)
{
MOZ_ASSERT(aBuf, "Expecting a non-null string buffer");
uint32_t stringLen = NS_strlen(static_cast<char16_t*>(aBuf->Data()));
// SANITY CHECK: In case the nsStringBuffer isn't correctly
// null-terminated, let's clamp its length using the allocated size, to be
// sure the resulting string doesn't sample past the end of the the buffer.
// (Note that StorageSize() is in units of bytes, so we have to convert that
// to units of PRUnichars, and subtract 1 for the null-terminator.)
uint32_t allocStringLen = (aBuf->StorageSize() / sizeof(char16_t)) - 1;
MOZ_ASSERT(stringLen <= allocStringLen,
"string buffer lacks null terminator!");
stringLen = std::min(stringLen, allocStringLen);
aBuf->ToString(stringLen, aResultString);
}
nsIPresShell*
nsContentUtils::FindPresShellForDocument(const nsIDocument* aDoc)
{
const nsIDocument* doc = aDoc;
nsIDocument* displayDoc = doc->GetDisplayDocument();
if (displayDoc) {
doc = displayDoc;
}
nsIPresShell* shell = doc->GetShell();
if (shell) {
return shell;
}
nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem = doc->GetDocShell();
while (docShellTreeItem) {
// We may be in a display:none subdocument, or we may not have a presshell
// created yet.
// Walk the docshell tree to find the nearest container that has a presshell,
// and return that.
nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(docShellTreeItem);
nsIPresShell* presShell = docShell->GetPresShell();
if (presShell) {
return presShell;
}
nsCOMPtr<nsIDocShellTreeItem> parent;
docShellTreeItem->GetParent(getter_AddRefs(parent));
docShellTreeItem = parent;
}
return nullptr;
}
nsIWidget*
nsContentUtils::WidgetForDocument(const nsIDocument* aDoc)
{
nsIPresShell* shell = FindPresShellForDocument(aDoc);
if (shell) {
nsViewManager* VM = shell->GetViewManager();
if (VM) {
nsView* rootView = VM->GetRootView();
if (rootView) {
nsView* displayRoot = nsViewManager::GetDisplayRootFor(rootView);
if (displayRoot) {
return displayRoot->GetNearestWidget(nullptr);
}
}
}
}
return nullptr;
}
nsIWidget*
nsContentUtils::WidgetForContent(const nsIContent* aContent)
{
nsIFrame* frame = aContent->GetPrimaryFrame();
if (frame) {
frame = nsLayoutUtils::GetDisplayRootFrame(frame);
nsView* view = frame->GetView();
if (view) {
return view->GetWidget();
}
}
return nullptr;
}
already_AddRefed<LayerManager>
nsContentUtils::LayerManagerForContent(const nsIContent *aContent)
{
nsIWidget* widget = nsContentUtils::WidgetForContent(aContent);
if (widget) {
RefPtr<LayerManager> manager = widget->GetLayerManager();
return manager.forget();
}
return nullptr;
}
static already_AddRefed<LayerManager>
LayerManagerForDocumentInternal(const nsIDocument *aDoc, bool aRequirePersistent)
{
nsIWidget *widget = nsContentUtils::WidgetForDocument(aDoc);
if (widget) {
RefPtr<LayerManager> manager =
widget->GetLayerManager(aRequirePersistent ? nsIWidget::LAYER_MANAGER_PERSISTENT :
nsIWidget::LAYER_MANAGER_CURRENT);
return manager.forget();
}
return nullptr;
}
already_AddRefed<LayerManager>
nsContentUtils::LayerManagerForDocument(const nsIDocument *aDoc)
{
return LayerManagerForDocumentInternal(aDoc, false);
}
already_AddRefed<LayerManager>
nsContentUtils::PersistentLayerManagerForDocument(nsIDocument *aDoc)
{
return LayerManagerForDocumentInternal(aDoc, true);
}
bool
nsContentUtils::AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal)
{
if (!aPrincipal) {
return false;
}
if (IsSystemPrincipal(aPrincipal)) {
return true;
}
nsCOMPtr<nsIURI> princURI;
aPrincipal->GetURI(getter_AddRefs(princURI));
return princURI &&
((sAllowXULXBL_for_file && SchemeIs(princURI, "file")) ||
IsSitePermAllow(aPrincipal, "allowXULXBL"));
}
bool
nsContentUtils::IsPDFJSEnabled()
{
nsCOMPtr<nsIStreamConverter> conv = do_CreateInstance(
"@mozilla.org/streamconv;1?from=application/pdf&to=text/html");
return conv;
}
already_AddRefed<nsIDocumentLoaderFactory>
nsContentUtils::FindInternalContentViewer(const nsACString& aType,
ContentViewerType* aLoaderType)
{
if (aLoaderType) {
*aLoaderType = TYPE_UNSUPPORTED;
}
// one helper factory, please
nsCOMPtr<nsICategoryManager> catMan(do_GetService(NS_CATEGORYMANAGER_CONTRACTID));
if (!catMan)
return nullptr;
nsCOMPtr<nsIDocumentLoaderFactory> docFactory;
nsCString contractID;
nsresult rv = catMan->GetCategoryEntry("Gecko-Content-Viewers",
aType, contractID);
if (NS_SUCCEEDED(rv)) {
docFactory = do_GetService(contractID.get());
if (docFactory && aLoaderType) {
if (contractID.EqualsLiteral(CONTENT_DLF_CONTRACTID))
*aLoaderType = TYPE_CONTENT;
else if (contractID.EqualsLiteral(PLUGIN_DLF_CONTRACTID))
*aLoaderType = TYPE_PLUGIN;
else
*aLoaderType = TYPE_UNKNOWN;
}
return docFactory.forget();
}
if (DecoderTraits::IsSupportedInVideoDocument(aType)) {
docFactory = do_GetService("@mozilla.org/content/document-loader-factory;1");
if (docFactory && aLoaderType) {
*aLoaderType = TYPE_CONTENT;
}
return docFactory.forget();
}
return nullptr;
}
static void
ReportPatternCompileFailure(nsAString& aPattern, nsIDocument* aDocument,
JSContext* cx)
{
MOZ_ASSERT(JS_IsExceptionPending(cx));
JS::RootedValue exn(cx);
if (!JS_GetPendingException(cx, &exn)) {
return;
}
if (!exn.isObject()) {
// If pending exception is not an object, it should be OOM.
return;
}
JS::AutoSaveExceptionState savedExc(cx);
JS::RootedObject exnObj(cx, &exn.toObject());
JS::RootedValue messageVal(cx);
if (!JS_GetProperty(cx, exnObj, "message", &messageVal)) {
return;
}
MOZ_ASSERT(messageVal.isString());
JS::RootedString messageStr(cx, messageVal.toString());
MOZ_ASSERT(messageStr);
nsAutoString wideMessage;
if (!AssignJSString(cx, wideMessage, messageStr)) {
return;
}
const nsString& pattern = PromiseFlatString(aPattern);
const char16_t *strings[] = { pattern.get(), wideMessage.get() };
nsContentUtils::ReportToConsole(nsIScriptError::errorFlag,
NS_LITERAL_CSTRING("DOM"),
aDocument,
nsContentUtils::eDOM_PROPERTIES,
"PatternAttributeCompileFailure",
strings, ArrayLength(strings));
savedExc.drop();
}
// static
bool
nsContentUtils::IsPatternMatching(nsAString& aValue, nsAString& aPattern,
nsIDocument* aDocument)
{
NS_ASSERTION(aDocument, "aDocument should be a valid pointer (not null)");
AutoJSContext cx;
AutoDisableJSInterruptCallback disabler(cx);
// We can use the junk scope here, because we're just using it for
// regexp evaluation, not actual script execution.
JSAutoRealm ar(cx, xpc::UnprivilegedJunkScope());
// The pattern has to match the entire value.
aPattern.InsertLiteral(u"^(?:", 0);
aPattern.AppendLiteral(")$");
JS::Rooted<JSObject*> re(cx,
JS_NewUCRegExpObject(cx,
static_cast<char16_t*>(aPattern.BeginWriting()),
aPattern.Length(), JSREG_UNICODE));
if (!re) {
// Remove extra patterns added above to report with the original pattern.
aPattern.Cut(0, 4);
aPattern.Cut(aPattern.Length() - 2, 2);
ReportPatternCompileFailure(aPattern, aDocument, cx);
return true;
}
JS::Rooted<JS::Value> rval(cx, JS::NullValue());
size_t idx = 0;
if (!JS_ExecuteRegExpNoStatics(cx, re,
static_cast<char16_t*>(aValue.BeginWriting()),
aValue.Length(), &idx, true, &rval)) {
return true;
}
return !rval.isNull();
}
// static
nsresult
nsContentUtils::URIInheritsSecurityContext(nsIURI *aURI, bool *aResult)
{
// Note: about:blank URIs do NOT inherit the security context from the
// current document, which is what this function tests for...
return NS_URIChainHasFlags(aURI,
nsIProtocolHandler::URI_INHERITS_SECURITY_CONTEXT,
aResult);
}
// static
bool
nsContentUtils::ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal,
nsIURI* aURI,
bool aInheritForAboutBlank,
bool aForceInherit)
{
MOZ_ASSERT(aLoadingPrincipal, "Can not check inheritance without a principal");
// Only tell the channel to inherit if it can't provide its own security context.
//
// XXX: If this is ever changed, check all callers for what owners
// they're passing in. In particular, see the code and
// comments in nsDocShell::LoadURI where we fall back on
// inheriting the owner if called from chrome. That would be
// very wrong if this code changed anything but channels that
// can't provide their own security context!
//
// If aForceInherit is true, we will inherit, even for a channel that
// can provide its own security context. This is used for srcdoc loads.
bool inherit = aForceInherit;
if (!inherit) {
bool uriInherits;
// We expect URIInheritsSecurityContext to return success for an
// about:blank URI, so don't call NS_IsAboutBlank() if this call fails.
// This condition needs to match the one in nsDocShell::InternalLoad where
// we're checking for things that will use the owner.
inherit =
(NS_SUCCEEDED(URIInheritsSecurityContext(aURI, &uriInherits)) &&
(uriInherits || (aInheritForAboutBlank && NS_IsAboutBlank(aURI)))) ||
//
// file: uri special-casing
//
// If this is a file: load opened from another file: then it may need
// to inherit the owner from the referrer so they can script each other.
// If we don't set the owner explicitly then each file: gets an owner
// based on its own codebase later.
//
(URIIsLocalFile(aURI) &&
NS_SUCCEEDED(aLoadingPrincipal->CheckMayLoad(aURI, false, false)) &&
// One more check here. CheckMayLoad will always return true for the
// system principal, but we do NOT want to inherit in that case.
!IsSystemPrincipal(aLoadingPrincipal));
}
return inherit;
}
/* static */
bool
nsContentUtils::IsFullScreenApiEnabled()
{
return sIsFullScreenApiEnabled;
}
/* static */
bool
nsContentUtils::IsRequestFullScreenAllowed(CallerType aCallerType)
{
// If more time has elapsed since the user input than is specified by the
// dom.event.handling-user-input-time-limit pref (default 1 second), this
// function also returns false.
if (!sTrustedFullScreenOnly || aCallerType == CallerType::System) {
return true;
}
if (EventStateManager::IsHandlingUserInput()) {
TimeDuration timeout = HandlingUserInputTimeout();
return timeout <= TimeDuration(nullptr) ||
(TimeStamp::Now() -
EventStateManager::GetHandlingInputStart()) <= timeout;
}
return false;
}
/* static */
bool
nsContentUtils::IsCutCopyAllowed(nsIPrincipal* aSubjectPrincipal)
{
if (!IsCutCopyRestricted() && EventStateManager::IsHandlingUserInput()) {
return true;
}
return PrincipalHasPermission(aSubjectPrincipal, nsGkAtoms::clipboardWrite);
}
/* static */
bool
nsContentUtils::IsFrameTimingEnabled()
{
return sIsFrameTimingPrefEnabled;
}
/* static */
bool
nsContentUtils::HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2)
{
if (!aDoc1 || !aDoc2) {
return false;
}
bool principalsEqual = false;
aDoc1->NodePrincipal()->Equals(aDoc2->NodePrincipal(), &principalsEqual);
return principalsEqual;
}
/* static */
bool
nsContentUtils::HasPluginWithUncontrolledEventDispatch(nsIContent* aContent)
{
#ifdef XP_MACOSX
// We control dispatch to all mac plugins.
return false;
#else
if (!aContent || !aContent->IsInComposedDoc()) {
return false;
}
nsCOMPtr<nsIObjectLoadingContent> olc = do_QueryInterface(aContent);
if (!olc) {
return false;
}
RefPtr<nsNPAPIPluginInstance> plugin;
olc->GetPluginInstance(getter_AddRefs(plugin));
if (!plugin) {
return false;
}
bool isWindowless = false;
nsresult res = plugin->IsWindowless(&isWindowless);
if (NS_FAILED(res)) {
return false;
}
return !isWindowless;
#endif
}
/* static */
void
nsContentUtils::FireMutationEventsForDirectParsing(nsIDocument* aDoc,
nsIContent* aDest,
int32_t aOldChildCount)
{
// Fire mutation events. Optimize for the case when there are no listeners
int32_t newChildCount = aDest->GetChildCount();
if (newChildCount && nsContentUtils::
HasMutationListeners(aDoc, NS_EVENT_BITS_MUTATION_NODEINSERTED)) {
AutoTArray<nsCOMPtr<nsIContent>, 50> childNodes;
NS_ASSERTION(newChildCount - aOldChildCount >= 0,
"What, some unexpected dom mutation has happened?");
childNodes.SetCapacity(newChildCount - aOldChildCount);
for (nsIContent* child = aDest->GetFirstChild();
child;
child = child->GetNextSibling()) {
childNodes.AppendElement(child);
}
FragmentOrElement::FireNodeInserted(aDoc, aDest, childNodes);
}
}
/* static */
nsIDocument*
nsContentUtils::GetRootDocument(nsIDocument* aDoc)
{
if (!aDoc) {
return nullptr;
}
nsIDocument* doc = aDoc;
while (doc->GetParentDocument()) {
doc = doc->GetParentDocument();
}
return doc;
}
/* static */
bool
nsContentUtils::IsInPointerLockContext(nsPIDOMWindowOuter* aWin)
{
if (!aWin) {
return false;
}
nsCOMPtr<nsIDocument> pointerLockedDoc =
do_QueryReferent(EventStateManager::sPointerLockedDoc);
if (!pointerLockedDoc || !pointerLockedDoc->GetWindow()) {
return false;
}
nsCOMPtr<nsPIDOMWindowOuter> lockTop =
pointerLockedDoc->GetWindow()->GetScriptableTop();
nsCOMPtr<nsPIDOMWindowOuter> top = aWin->GetScriptableTop();
return top == lockTop;
}
// static
int32_t
nsContentUtils::GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame,
int32_t aOffset)
{
// The structure of the anonymous frames within a text control frame is
// an optional block frame, followed by an optional br frame.
// If the offset frame has a child, then this frame is the block which
// has the text frames (containing the content) as its children. This will
// be the case if we click to the right of any of the text frames, or at the
// bottom of the text area.
nsIFrame* firstChild = aOffsetFrame->PrincipalChildList().FirstChild();
if (firstChild) {
// In this case, the passed-in offset is incorrect, and we want the length
// of the entire content in the text control frame.
return firstChild->GetContent()->Length();
}
if (aOffsetFrame->GetPrevSibling() &&
!aOffsetFrame->GetNextSibling()) {
// In this case, we're actually within the last frame, which is a br
// frame. Our offset should therefore be the length of the first child of
// our parent.
int32_t aOutOffset =
aOffsetFrame->GetParent()->PrincipalChildList().FirstChild()->GetContent()->Length();
return aOutOffset;
}
// Otherwise, we're within one of the text frames, in which case our offset
// has already been correctly calculated.
return aOffset;
}
// static
void
nsContentUtils::GetSelectionInTextControl(Selection* aSelection,
Element* aRoot,
uint32_t& aOutStartOffset,
uint32_t& aOutEndOffset)
{
MOZ_ASSERT(aSelection && aRoot);
// We don't care which end of this selection is anchor and which is focus. In
// fact, we explicitly want to know which is the _start_ and which is the
// _end_, not anchor vs focus.
const nsRange* range = aSelection->GetAnchorFocusRange();
if (!range) {
// Nothing selected
aOutStartOffset = aOutEndOffset = 0;
return;
}
// All the node pointers here are raw pointers for performance. We shouldn't
// be doing anything in this function that invalidates the node tree.
nsINode* startContainer = range->GetStartContainer();
uint32_t startOffset = range->StartOffset();
nsINode* endContainer = range->GetEndContainer();
uint32_t endOffset = range->EndOffset();
// We have at most two children, consisting of an optional text node followed
// by an optional <br>.
NS_ASSERTION(aRoot->GetChildCount() <= 2, "Unexpected children");
nsIContent* firstChild = aRoot->GetFirstChild();
#ifdef DEBUG
nsCOMPtr<nsIContent> lastChild = aRoot->GetLastChild();
NS_ASSERTION(startContainer == aRoot || startContainer == firstChild ||
startContainer == lastChild, "Unexpected startContainer");
NS_ASSERTION(endContainer == aRoot || endContainer == firstChild ||
endContainer == lastChild, "Unexpected endContainer");
// firstChild is either text or a <br> (hence an element).
MOZ_ASSERT_IF(firstChild,
firstChild->IsText() || firstChild->IsElement());
#endif
// Testing IsElement() is faster than testing IsNodeOfType(), since it's
// non-virtual.
if (!firstChild || firstChild->IsElement()) {
// No text node, so everything is 0
startOffset = endOffset = 0;
} else {
// First child is text. If the start/end is already in the text node,
// or the start of the root node, no change needed. If it's in the root
// node but not the start, or in the trailing <br>, we need to set the
// offset to the end.
if ((startContainer == aRoot && startOffset != 0) ||
(startContainer != aRoot && startContainer != firstChild)) {
startOffset = firstChild->Length();
}
if ((endContainer == aRoot && endOffset != 0) ||
(endContainer != aRoot && endContainer != firstChild)) {
endOffset = firstChild->Length();
}
}
MOZ_ASSERT(startOffset <= endOffset);
aOutStartOffset = startOffset;
aOutEndOffset = endOffset;
}
HTMLEditor*
nsContentUtils::GetHTMLEditor(nsPresContext* aPresContext)
{
nsCOMPtr<nsIDocShell> docShell(aPresContext->GetDocShell());
bool isEditable;
if (!docShell ||
NS_FAILED(docShell->GetEditable(&isEditable)) || !isEditable)
return nullptr;
return docShell->GetHTMLEditor();
}
// static
bool
nsContentUtils::IsForbiddenRequestHeader(const nsACString& aHeader)
{
if (IsForbiddenSystemRequestHeader(aHeader)) {
return true;
}
return StringBeginsWith(aHeader, NS_LITERAL_CSTRING("proxy-"),
nsCaseInsensitiveCStringComparator()) ||
StringBeginsWith(aHeader, NS_LITERAL_CSTRING("sec-"),
nsCaseInsensitiveCStringComparator());
}
// static
bool
nsContentUtils::IsForbiddenSystemRequestHeader(const nsACString& aHeader)
{
static const char *kInvalidHeaders[] = {
"accept-charset", "accept-encoding", "access-control-request-headers",
"access-control-request-method", "connection", "content-length",
"cookie", "cookie2", "date", "dnt", "expect", "host", "keep-alive",
"origin", "referer", "te", "trailer", "transfer-encoding", "upgrade", "via"
};
for (auto& kInvalidHeader : kInvalidHeaders) {
if (aHeader.LowerCaseEqualsASCII(kInvalidHeader)) {
return true;
}
}
return false;
}
// static
bool
nsContentUtils::IsForbiddenResponseHeader(const nsACString& aHeader)
{
return (aHeader.LowerCaseEqualsASCII("set-cookie") ||
aHeader.LowerCaseEqualsASCII("set-cookie2"));
}
// static
bool
nsContentUtils::IsAllowedNonCorsContentType(const nsACString& aHeaderValue)
{
nsAutoCString contentType;
nsAutoCString unused;
nsresult rv = NS_ParseRequestContentType(aHeaderValue, contentType, unused);
if (NS_FAILED(rv)) {
return false;
}
return contentType.LowerCaseEqualsLiteral("text/plain") ||
contentType.LowerCaseEqualsLiteral("application/x-www-form-urlencoded") ||
contentType.LowerCaseEqualsLiteral("multipart/form-data");
}
bool
nsContentUtils::DoNotTrackEnabled()
{
return nsContentUtils::sDoNotTrackEnabled;
}
mozilla::LogModule*
nsContentUtils::DOMDumpLog()
{
return sDOMDumpLog;
}
bool
nsContentUtils::GetNodeTextContent(nsINode* aNode, bool aDeep, nsAString& aResult,
const fallible_t& aFallible)
{
aResult.Truncate();
return AppendNodeTextContent(aNode, aDeep, aResult, aFallible);
}
void
nsContentUtils::GetNodeTextContent(nsINode* aNode, bool aDeep, nsAString& aResult)
{
if (!GetNodeTextContent(aNode, aDeep, aResult, fallible)) {
NS_ABORT_OOM(0); // Unfortunately we don't know the allocation size
}
}
void
nsContentUtils::DestroyMatchString(void* aData)
{
if (aData) {
nsString* matchString = static_cast<nsString*>(aData);
delete matchString;
}
}
bool
nsContentUtils::IsJavascriptMIMEType(const nsAString& aMIMEType)
{
// Table ordered from most to least likely JS MIME types.
static const char* jsTypes[] = {
"text/javascript",
"text/ecmascript",
"application/javascript",
"application/ecmascript",
"application/x-javascript",
"application/x-ecmascript",
"text/javascript1.0",
"text/javascript1.1",
"text/javascript1.2",
"text/javascript1.3",
"text/javascript1.4",
"text/javascript1.5",
"text/jscript",
"text/livescript",
"text/x-ecmascript",
"text/x-javascript",
nullptr
};
for (uint32_t i = 0; jsTypes[i]; ++i) {
if (aMIMEType.LowerCaseEqualsASCII(jsTypes[i])) {
return true;
}
}
return false;
}
nsresult
nsContentUtils::GenerateUUIDInPlace(nsID& aUUID)
{
MOZ_ASSERT(sUUIDGenerator);
nsresult rv = sUUIDGenerator->GenerateUUIDInPlace(&aUUID);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
bool
nsContentUtils::PrefetchPreloadEnabled(nsIDocShell* aDocShell)
{
//
// SECURITY CHECK: disable prefetching and preloading from mailnews!
//
// walk up the docshell tree to see if any containing
// docshell are of type MAIL.
//
if (!aDocShell) {
return false;
}
nsCOMPtr<nsIDocShell> docshell = aDocShell;
nsCOMPtr<nsIDocShellTreeItem> parentItem;
do {
uint32_t appType = 0;
nsresult rv = docshell->GetAppType(&appType);
if (NS_FAILED(rv) || appType == nsIDocShell::APP_TYPE_MAIL) {
return false; // do not prefetch, preload, preconnect from mailnews
}
docshell->GetParent(getter_AddRefs(parentItem));
if (parentItem) {
docshell = do_QueryInterface(parentItem);
if (!docshell) {
NS_ERROR("cannot get a docshell from a treeItem!");
return false;
}
}
} while (parentItem);
return true;
}
uint64_t
nsContentUtils::GetInnerWindowID(nsIRequest* aRequest)
{
// can't do anything if there's no nsIRequest!
if (!aRequest) {
return 0;
}
nsCOMPtr<nsILoadGroup> loadGroup;
nsresult rv = aRequest->GetLoadGroup(getter_AddRefs(loadGroup));
if (NS_FAILED(rv) || !loadGroup) {
return 0;
}
return GetInnerWindowID(loadGroup);
}
uint64_t
nsContentUtils::GetInnerWindowID(nsILoadGroup* aLoadGroup)
{
if (!aLoadGroup) {
return 0;
}
nsCOMPtr<nsIInterfaceRequestor> callbacks;
nsresult rv = aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
if (NS_FAILED(rv) || !callbacks) {
return 0;
}
nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
if (!loadContext) {
return 0;
}
nsCOMPtr<mozIDOMWindowProxy> window;
rv = loadContext->GetAssociatedWindow(getter_AddRefs(window));
if (NS_FAILED(rv) || !window) {
return 0;
}
auto* pwindow = nsPIDOMWindowOuter::From(window);
if (!pwindow) {
return 0;
}
nsPIDOMWindowInner* inner = pwindow->GetCurrentInnerWindow();
return inner ? inner->WindowID() : 0;
}
nsresult
nsContentUtils::GetHostOrIPv6WithBrackets(nsIURI* aURI, nsCString& aHost)
{
aHost.Truncate();
nsresult rv = aURI->GetHost(aHost);
if (NS_FAILED(rv)) { // Some URIs do not have a host
return rv;
}
if (aHost.FindChar(':') != -1) { // Escape IPv6 address
MOZ_ASSERT(!aHost.Length() ||
(aHost[0] !='[' && aHost[aHost.Length() - 1] != ']'));
aHost.Insert('[', 0);
aHost.Append(']');
}
return NS_OK;
}
nsresult
nsContentUtils::GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost)
{
nsAutoCString hostname;
nsresult rv = GetHostOrIPv6WithBrackets(aURI, hostname);
if (NS_FAILED(rv)) {
return rv;
}
CopyUTF8toUTF16(hostname, aHost);
return NS_OK;
}
bool
nsContentUtils::CallOnAllRemoteChildren(MessageBroadcaster* aManager,
CallOnRemoteChildFunction aCallback,
void* aArg)
{
uint32_t tabChildCount = aManager->ChildCount();
for (uint32_t j = 0; j < tabChildCount; ++j) {
RefPtr<MessageListenerManager> childMM = aManager->GetChildAt(j);
if (!childMM) {
continue;
}
RefPtr<MessageBroadcaster> nonLeafMM = MessageBroadcaster::From(childMM);
if (nonLeafMM) {
if (CallOnAllRemoteChildren(nonLeafMM, aCallback, aArg)) {
return true;
}
continue;
}
mozilla::dom::ipc::MessageManagerCallback* cb = childMM->GetCallback();
if (cb) {
nsFrameLoader* fl = static_cast<nsFrameLoader*>(cb);
TabParent* remote = TabParent::GetFrom(fl);
if (remote && aCallback) {
if (aCallback(remote, aArg)) {
return true;
}
}
}
}
return false;
}
void
nsContentUtils::CallOnAllRemoteChildren(nsPIDOMWindowOuter* aWindow,
CallOnRemoteChildFunction aCallback,
void* aArg)
{
nsGlobalWindowOuter* window = nsGlobalWindowOuter::Cast(aWindow);
if (window->IsChromeWindow()) {
RefPtr<MessageBroadcaster> windowMM = window->GetMessageManager();
if (windowMM) {
CallOnAllRemoteChildren(windowMM, aCallback, aArg);
}
}
}
struct UIStateChangeInfo {
UIStateChangeType mShowAccelerators;
UIStateChangeType mShowFocusRings;
UIStateChangeInfo(UIStateChangeType aShowAccelerators,
UIStateChangeType aShowFocusRings)
: mShowAccelerators(aShowAccelerators),
mShowFocusRings(aShowFocusRings)
{}
};
bool
SetKeyboardIndicatorsChild(TabParent* aParent, void* aArg)
{
UIStateChangeInfo* stateInfo = static_cast<UIStateChangeInfo*>(aArg);
Unused << aParent->SendSetKeyboardIndicators(stateInfo->mShowAccelerators,
stateInfo->mShowFocusRings);
return false;
}
void
nsContentUtils::SetKeyboardIndicatorsOnRemoteChildren(nsPIDOMWindowOuter* aWindow,
UIStateChangeType aShowAccelerators,
UIStateChangeType aShowFocusRings)
{
UIStateChangeInfo stateInfo(aShowAccelerators, aShowFocusRings);
CallOnAllRemoteChildren(aWindow, SetKeyboardIndicatorsChild,
(void *)&stateInfo);
}
nsresult
nsContentUtils::IPCTransferableToTransferable(const IPCDataTransfer& aDataTransfer,
const bool& aIsPrivateData,
nsIPrincipal* aRequestingPrincipal,
const nsContentPolicyType& aContentPolicyType,
nsITransferable* aTransferable,
mozilla::dom::nsIContentParent* aContentParent,
mozilla::dom::TabChild* aTabChild)
{
nsresult rv;
const nsTArray<IPCDataTransferItem>& items = aDataTransfer.items();
for (const auto& item : items) {
aTransferable->AddDataFlavor(item.flavor().get());
if (item.data().type() == IPCDataTransferData::TnsString) {
nsCOMPtr<nsISupportsString> dataWrapper =
do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
const nsString& text = item.data().get_nsString();
rv = dataWrapper->SetData(text);
NS_ENSURE_SUCCESS(rv, rv);
rv = aTransferable->SetTransferData(item.flavor().get(), dataWrapper,
text.Length() * sizeof(char16_t));
NS_ENSURE_SUCCESS(rv, rv);
} else if (item.data().type() == IPCDataTransferData::TShmem) {
if (nsContentUtils::IsFlavorImage(item.flavor())) {
nsCOMPtr<imgIContainer> imageContainer;
rv = nsContentUtils::DataTransferItemToImage(item,
getter_AddRefs(imageContainer));
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISupportsInterfacePointer> imgPtr =
do_CreateInstance(NS_SUPPORTS_INTERFACE_POINTER_CONTRACTID);
NS_ENSURE_TRUE(imgPtr, NS_ERROR_FAILURE);
rv = imgPtr->SetData(imageContainer);
NS_ENSURE_SUCCESS(rv, rv);
aTransferable->SetTransferData(item.flavor().get(), imgPtr, sizeof(nsISupports*));
} else {
nsCOMPtr<nsISupportsCString> dataWrapper =
do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
// The buffer contains the terminating null.
Shmem itemData = item.data().get_Shmem();
const nsDependentCSubstring text(itemData.get<char>(),
itemData.Size<char>());
rv = dataWrapper->SetData(text);
NS_ENSURE_SUCCESS(rv, rv);
rv = aTransferable->SetTransferData(item.flavor().get(), dataWrapper, text.Length());
NS_ENSURE_SUCCESS(rv, rv);
}
if (aContentParent) {
Unused << aContentParent->DeallocShmem(item.data().get_Shmem());
} else if (aTabChild) {
Unused << aTabChild->DeallocShmem(item.data().get_Shmem());
}
}
}
aTransferable->SetIsPrivateData(aIsPrivateData);
aTransferable->SetRequestingPrincipal(aRequestingPrincipal);
aTransferable->SetContentPolicyType(aContentPolicyType);
return NS_OK;
}
void
nsContentUtils::TransferablesToIPCTransferables(nsIArray* aTransferables,
nsTArray<IPCDataTransfer>& aIPC,
bool aInSyncMessage,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent)
{
aIPC.Clear();
if (aTransferables) {
uint32_t transferableCount = 0;
aTransferables->GetLength(&transferableCount);
for (uint32_t i = 0; i < transferableCount; ++i) {
IPCDataTransfer* dt = aIPC.AppendElement();
nsCOMPtr<nsITransferable> transferable = do_QueryElementAt(aTransferables, i);
TransferableToIPCTransferable(transferable, dt, aInSyncMessage, aChild, aParent);
}
}
}
nsresult
nsContentUtils::SlurpFileToString(nsIFile* aFile, nsACString& aString)
{
aString.Truncate();
nsCOMPtr<nsIURI> fileURI;
nsresult rv = NS_NewFileURI(getter_AddRefs(fileURI), aFile);
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsIChannel> channel;
rv = NS_NewChannel(getter_AddRefs(channel),
fileURI,
nsContentUtils::GetSystemPrincipal(),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
nsIContentPolicy::TYPE_OTHER);
if (NS_FAILED(rv)) {
return rv;
}
nsCOMPtr<nsIInputStream> stream;
rv = channel->Open2(getter_AddRefs(stream));
if (NS_FAILED(rv)) {
return rv;
}
rv = NS_ConsumeStream(stream, UINT32_MAX, aString);
if (NS_FAILED(rv)) {
return rv;
}
rv = stream->Close();
if (NS_FAILED(rv)) {
return rv;
}
return NS_OK;
}
bool
nsContentUtils::IsFileImage(nsIFile* aFile, nsACString& aType)
{
nsCOMPtr<nsIMIMEService> mime = do_GetService("@mozilla.org/mime;1");
if (!mime) {
return false;
}
nsresult rv = mime->GetTypeFromFile(aFile, aType);
if (NS_FAILED(rv)) {
return false;
}
return StringBeginsWith(aType, NS_LITERAL_CSTRING("image/"));
}
nsresult
nsContentUtils::CalculateBufferSizeForImage(const uint32_t& aStride,
const IntSize& aImageSize,
const SurfaceFormat& aFormat,
size_t* aMaxBufferSize,
size_t* aUsedBufferSize)
{
CheckedInt32 requiredBytes =
CheckedInt32(aStride) * CheckedInt32(aImageSize.height);
if (!requiredBytes.isValid()) {
return NS_ERROR_FAILURE;
}
*aMaxBufferSize = requiredBytes.value();
*aUsedBufferSize = *aMaxBufferSize - aStride + (aImageSize.width * BytesPerPixel(aFormat));
return NS_OK;
}
nsresult
nsContentUtils::DataTransferItemToImage(const IPCDataTransferItem& aItem,
imgIContainer** aContainer)
{
MOZ_ASSERT(aItem.data().type() == IPCDataTransferData::TShmem);
MOZ_ASSERT(IsFlavorImage(aItem.flavor()));
const IPCDataTransferImage& imageDetails = aItem.imageDetails();
const IntSize size(imageDetails.width(), imageDetails.height());
if (!size.width || !size.height) {
return NS_ERROR_FAILURE;
}
Shmem data = aItem.data().get_Shmem();
// Validate shared memory buffer size
size_t imageBufLen = 0;
size_t maxBufLen = 0;
nsresult rv = CalculateBufferSizeForImage(imageDetails.stride(),
size,
imageDetails.format(),
&maxBufLen,
&imageBufLen);
if (NS_FAILED(rv)) {
return rv;
}
if (imageBufLen > data.Size<uint8_t>()) {
return NS_ERROR_FAILURE;
}
RefPtr<DataSourceSurface> image =
CreateDataSourceSurfaceFromData(size,
imageDetails.format(),
data.get<uint8_t>(),
imageDetails.stride());
RefPtr<gfxDrawable> drawable = new gfxSurfaceDrawable(image, size);
nsCOMPtr<imgIContainer> imageContainer =
image::ImageOps::CreateFromDrawable(drawable);
imageContainer.forget(aContainer);
return NS_OK;
}
bool
nsContentUtils::IsFlavorImage(const nsACString& aFlavor)
{
return aFlavor.EqualsLiteral(kNativeImageMime) ||
aFlavor.EqualsLiteral(kJPEGImageMime) ||
aFlavor.EqualsLiteral(kJPGImageMime) ||
aFlavor.EqualsLiteral(kPNGImageMime) ||
aFlavor.EqualsLiteral(kGIFImageMime);
}
static Shmem
ConvertToShmem(mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent,
const nsACString& aInput)
{
MOZ_ASSERT((aChild && !aParent) || (!aChild && aParent));
IShmemAllocator* allocator =
aChild ? static_cast<IShmemAllocator*>(aChild)
: static_cast<IShmemAllocator*>(aParent);
Shmem result;
if (!allocator->AllocShmem(aInput.Length(),
SharedMemory::TYPE_BASIC,
&result)) {
return result;
}
memcpy(result.get<char>(),
aInput.BeginReading(),
aInput.Length());
return result;
}
void
nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
IPCDataTransfer* aIPCDataTransfer,
bool aInSyncMessage,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent)
{
MOZ_ASSERT((aChild && !aParent) || (!aChild && aParent));
if (aTransferable) {
nsCOMPtr<nsIArray> flavorList;
aTransferable->FlavorsTransferableCanExport(getter_AddRefs(flavorList));
if (flavorList) {
uint32_t flavorCount = 0;
flavorList->GetLength(&flavorCount);
for (uint32_t j = 0; j < flavorCount; ++j) {
nsCOMPtr<nsISupportsCString> flavor = do_QueryElementAt(flavorList, j);
if (!flavor) {
continue;
}
nsAutoCString flavorStr;
flavor->GetData(flavorStr);
if (!flavorStr.Length()) {
continue;
}
nsCOMPtr<nsISupports> data;
uint32_t dataLen = 0;
aTransferable->GetTransferData(flavorStr.get(), getter_AddRefs(data), &dataLen);
nsCOMPtr<nsISupportsString> text = do_QueryInterface(data);
nsCOMPtr<nsISupportsCString> ctext = do_QueryInterface(data);
if (text) {
nsAutoString dataAsString;
text->GetData(dataAsString);
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
item->data() = dataAsString;
} else if (ctext) {
nsAutoCString dataAsString;
ctext->GetData(dataAsString);
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
Shmem dataAsShmem = ConvertToShmem(aChild, aParent, dataAsString);
if (!dataAsShmem.IsReadable() || !dataAsShmem.Size<char>()) {
continue;
}
item->data() = dataAsShmem;
} else {
nsCOMPtr<nsISupportsInterfacePointer> sip =
do_QueryInterface(data);
if (sip) {
sip->GetData(getter_AddRefs(data));
}
// Images to be pasted on the clipboard are nsIInputStreams
nsCOMPtr<nsIInputStream> stream(do_QueryInterface(data));
if (stream) {
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
nsCString imageData;
NS_ConsumeStream(stream, UINT32_MAX, imageData);
Shmem imageDataShmem = ConvertToShmem(aChild, aParent, imageData);
if (!imageDataShmem.IsReadable() || !imageDataShmem.Size<char>()) {
continue;
}
item->data() = imageDataShmem;
continue;
}
// Images to be placed on the clipboard are imgIContainers.
nsCOMPtr<imgIContainer> image(do_QueryInterface(data));
if (image) {
RefPtr<mozilla::gfx::SourceSurface> surface =
image->GetFrame(imgIContainer::FRAME_CURRENT,
imgIContainer::FLAG_SYNC_DECODE);
if (!surface) {
continue;
}
RefPtr<mozilla::gfx::DataSourceSurface> dataSurface =
surface->GetDataSurface();
if (!dataSurface) {
continue;
}
size_t length;
int32_t stride;
IShmemAllocator* allocator = aChild ? static_cast<IShmemAllocator*>(aChild)
: static_cast<IShmemAllocator*>(aParent);
Maybe<Shmem> surfaceData = GetSurfaceData(dataSurface, &length, &stride,
allocator);
if (surfaceData.isNothing()) {
continue;
}
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
// Turn item->data() into an nsCString prior to accessing it.
item->data() = surfaceData.ref();
IPCDataTransferImage& imageDetails = item->imageDetails();
mozilla::gfx::IntSize size = dataSurface->GetSize();
imageDetails.width() = size.width;
imageDetails.height() = size.height;
imageDetails.stride() = stride;
imageDetails.format() = dataSurface->GetFormat();
continue;
}
// Otherwise, handle this as a file.
nsCOMPtr<BlobImpl> blobImpl;
nsCOMPtr<nsIFile> file = do_QueryInterface(data);
if (file) {
// If we can send this over as a blob, do so. Otherwise, we're
// responding to a sync message and the child can't process the blob
// constructor before processing our response, which would crash. In
// that case, hope that the caller is nsClipboardProxy::GetData,
// called from editor and send over images as raw data.
if (aInSyncMessage) {
nsAutoCString type;
if (IsFileImage(file, type)) {
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = type;
nsAutoCString data;
SlurpFileToString(file, data);
Shmem dataAsShmem = ConvertToShmem(aChild, aParent, data);
item->data() = dataAsShmem;
}
continue;
}
if (aParent) {
bool isDir = false;
if (NS_SUCCEEDED(file->IsDirectory(&isDir)) && isDir) {
nsAutoString path;
if (NS_WARN_IF(NS_FAILED(file->GetPath(path)))) {
continue;
}
RefPtr<FileSystemSecurity> fss = FileSystemSecurity::GetOrCreate();
fss->GrantAccessToContentProcess(aParent->ChildID(), path);
}
}
blobImpl = new FileBlobImpl(file);
IgnoredErrorResult rv;
// Ensure that file data is cached no that the content process
// has this data available to it when passed over:
blobImpl->GetSize(rv);
if (NS_WARN_IF(rv.Failed())) {
continue;
}
blobImpl->GetLastModified(rv);
if (NS_WARN_IF(rv.Failed())) {
continue;
}
} else {
if (aInSyncMessage) {
// Can't do anything.
continue;
}
blobImpl = do_QueryInterface(data);
}
if (blobImpl) {
IPCDataTransferData data;
IPCBlob ipcBlob;
// If we failed to create the blob actor, then this blob probably
// can't get the file size for the underlying file, ignore it for
// now. TODO pass this through anyway.
if (aChild) {
nsresult rv = IPCBlobUtils::Serialize(blobImpl, aChild, ipcBlob);
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
data = ipcBlob;
} else if (aParent) {
nsresult rv = IPCBlobUtils::Serialize(blobImpl, aParent, ipcBlob);
if (NS_WARN_IF(NS_FAILED(rv))) {
continue;
}
data = ipcBlob;
}
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
item->data() = data;
} else {
// This is a hack to support kFilePromiseMime.
// On Windows there just needs to be an entry for it,
// and for OSX we need to create
// nsContentAreaDragDropDataProvider as nsIFlavorDataProvider.
if (flavorStr.EqualsLiteral(kFilePromiseMime)) {
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
item->data() = NS_ConvertUTF8toUTF16(flavorStr);
} else if (!data) {
// Empty element, transfer only the flavor
IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
item->flavor() = flavorStr;
item->data() = nsString();
continue;
}
}
}
}
}
}
}
namespace {
// The default type used for calling GetSurfaceData(). Gets surface data as
// raw buffer.
struct GetSurfaceDataRawBuffer
{
using ReturnType = mozilla::UniquePtr<char[]>;
using BufferType = char*;
ReturnType Allocate(size_t aSize)
{
return ReturnType(new char[aSize]);
}
static BufferType
GetBuffer(const ReturnType& aReturnValue)
{
return aReturnValue.get();
}
static ReturnType
NullValue()
{
return ReturnType();
}
};
// The type used for calling GetSurfaceData() that allocates and writes to
// a shared memory buffer.
struct GetSurfaceDataShmem
{
using ReturnType = Maybe<Shmem>;
using BufferType = char*;
explicit GetSurfaceDataShmem(IShmemAllocator* aAllocator)
: mAllocator(aAllocator)
{ }
ReturnType Allocate(size_t aSize)
{
Shmem shmem;
if (!mAllocator->AllocShmem(aSize, SharedMemory::TYPE_BASIC, &shmem)) {
return Nothing();
}
return Some(shmem);
}
static BufferType
GetBuffer(const ReturnType& aReturnValue)
{
return aReturnValue.isSome() ? aReturnValue.ref().get<char>() : nullptr;
}
static ReturnType
NullValue()
{
return ReturnType();
}
private:
IShmemAllocator* mAllocator;
};
/*
* Get the pixel data from the given source surface and return it as a buffer.
* The length and stride will be assigned from the surface.
*/
template <typename GetSurfaceDataContext = GetSurfaceDataRawBuffer>
typename GetSurfaceDataContext::ReturnType
GetSurfaceDataImpl(mozilla::gfx::DataSourceSurface* aSurface,
size_t* aLength, int32_t* aStride,
GetSurfaceDataContext aContext = GetSurfaceDataContext())
{
mozilla::gfx::DataSourceSurface::MappedSurface map;
if (!aSurface->Map(mozilla::gfx::DataSourceSurface::MapType::READ, &map)) {
return GetSurfaceDataContext::NullValue();
}
size_t bufLen = 0;
size_t maxBufLen = 0;
nsresult rv = nsContentUtils::CalculateBufferSizeForImage(map.mStride,
aSurface->GetSize(),
aSurface->GetFormat(),
&maxBufLen,
&bufLen);
if (NS_FAILED(rv)) {
aSurface->Unmap();
return GetSurfaceDataContext::NullValue();
}
// nsDependentCString wants null-terminated string.
typename GetSurfaceDataContext::ReturnType surfaceData = aContext.Allocate(maxBufLen + 1);
if (GetSurfaceDataContext::GetBuffer(surfaceData)) {
memcpy(GetSurfaceDataContext::GetBuffer(surfaceData),
reinterpret_cast<char*>(map.mData),
bufLen);
memset(GetSurfaceDataContext::GetBuffer(surfaceData) + bufLen,
0,
maxBufLen - bufLen + 1);
}
*aLength = maxBufLen;
*aStride = map.mStride;
aSurface->Unmap();
return surfaceData;
}
} // Anonymous namespace.
mozilla::UniquePtr<char[]>
nsContentUtils::GetSurfaceData(
NotNull<mozilla::gfx::DataSourceSurface*> aSurface,
size_t* aLength, int32_t* aStride)
{
return GetSurfaceDataImpl(aSurface, aLength, aStride);
}
Maybe<Shmem>
nsContentUtils::GetSurfaceData(mozilla::gfx::DataSourceSurface* aSurface,
size_t* aLength, int32_t* aStride,
IShmemAllocator* aAllocator)
{
return GetSurfaceDataImpl(aSurface, aLength, aStride,
GetSurfaceDataShmem(aAllocator));
}
mozilla::Modifiers
nsContentUtils::GetWidgetModifiers(int32_t aModifiers)
{
Modifiers result = 0;
if (aModifiers & nsIDOMWindowUtils::MODIFIER_SHIFT) {
result |= mozilla::MODIFIER_SHIFT;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_CONTROL) {
result |= mozilla::MODIFIER_CONTROL;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_ALT) {
result |= mozilla::MODIFIER_ALT;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_META) {
result |= mozilla::MODIFIER_META;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_ALTGRAPH) {
result |= mozilla::MODIFIER_ALTGRAPH;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_CAPSLOCK) {
result |= mozilla::MODIFIER_CAPSLOCK;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_FN) {
result |= mozilla::MODIFIER_FN;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_FNLOCK) {
result |= mozilla::MODIFIER_FNLOCK;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_NUMLOCK) {
result |= mozilla::MODIFIER_NUMLOCK;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_SCROLLLOCK) {
result |= mozilla::MODIFIER_SCROLLLOCK;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_SYMBOL) {
result |= mozilla::MODIFIER_SYMBOL;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_SYMBOLLOCK) {
result |= mozilla::MODIFIER_SYMBOLLOCK;
}
if (aModifiers & nsIDOMWindowUtils::MODIFIER_OS) {
result |= mozilla::MODIFIER_OS;
}
return result;
}
nsIWidget*
nsContentUtils::GetWidget(nsIPresShell* aPresShell, nsPoint* aOffset) {
if (aPresShell) {
nsIFrame* frame = aPresShell->GetRootFrame();
if (frame)
return frame->GetView()->GetNearestWidget(aOffset);
}
return nullptr;
}
int16_t
nsContentUtils::GetButtonsFlagForButton(int32_t aButton)
{
switch (aButton) {
case -1:
return WidgetMouseEvent::eNoButtonFlag;
case WidgetMouseEvent::eLeftButton:
return WidgetMouseEvent::eLeftButtonFlag;
case WidgetMouseEvent::eMiddleButton:
return WidgetMouseEvent::eMiddleButtonFlag;
case WidgetMouseEvent::eRightButton:
return WidgetMouseEvent::eRightButtonFlag;
case 4:
return WidgetMouseEvent::e4thButtonFlag;
case 5:
return WidgetMouseEvent::e5thButtonFlag;
default:
NS_ERROR("Button not known.");
return 0;
}
}
LayoutDeviceIntPoint
nsContentUtils::ToWidgetPoint(const CSSPoint& aPoint,
const nsPoint& aOffset,
nsPresContext* aPresContext)
{
return LayoutDeviceIntPoint::FromAppUnitsRounded(
(CSSPoint::ToAppUnits(aPoint) +
aOffset).ApplyResolution(nsLayoutUtils::GetCurrentAPZResolutionScale(aPresContext->PresShell())),
aPresContext->AppUnitsPerDevPixel());
}
nsView*
nsContentUtils::GetViewToDispatchEvent(nsPresContext* presContext,
nsIPresShell** presShell)
{
if (presContext && presShell) {
*presShell = presContext->PresShell();
if (*presShell) {
NS_ADDREF(*presShell);
if (nsViewManager* viewManager = (*presShell)->GetViewManager()) {
if (nsView* view = viewManager->GetRootView()) {
return view;
}
}
}
}
return nullptr;
}
nsresult
nsContentUtils::SendMouseEvent(const nsCOMPtr<nsIPresShell>& aPresShell,
const nsAString& aType,
float aX,
float aY,
int32_t aButton,
int32_t aButtons,
int32_t aClickCount,
int32_t aModifiers,
bool aIgnoreRootScrollFrame,
float aPressure,
unsigned short aInputSourceArg,
uint32_t aIdentifier,
bool aToWindow,
bool *aPreventDefault,
bool aIsDOMEventSynthesized,
bool aIsWidgetEventSynthesized)
{
nsPoint offset;
nsCOMPtr<nsIWidget> widget = GetWidget(aPresShell, &offset);
if (!widget)
return NS_ERROR_FAILURE;
EventMessage msg;
WidgetMouseEvent::ExitFrom exitFrom = WidgetMouseEvent::eChild;
bool contextMenuKey = false;
if (aType.EqualsLiteral("mousedown")) {
msg = eMouseDown;
} else if (aType.EqualsLiteral("mouseup")) {
msg = eMouseUp;
} else if (aType.EqualsLiteral("mousemove")) {
msg = eMouseMove;
} else if (aType.EqualsLiteral("mouseover")) {
msg = eMouseEnterIntoWidget;
} else if (aType.EqualsLiteral("mouseout")) {
msg = eMouseExitFromWidget;
} else if (aType.EqualsLiteral("mousecancel")) {
msg = eMouseExitFromWidget;
exitFrom = WidgetMouseEvent::eTopLevel;
} else if (aType.EqualsLiteral("mouselongtap")) {
msg = eMouseLongTap;
} else if (aType.EqualsLiteral("contextmenu")) {
msg = eContextMenu;
contextMenuKey = (aButton == 0);
} else if (aType.EqualsLiteral("MozMouseHittest")) {
msg = eMouseHitTest;
} else {
return NS_ERROR_FAILURE;
}
if (aInputSourceArg == MouseEvent_Binding::MOZ_SOURCE_UNKNOWN) {
aInputSourceArg = MouseEvent_Binding::MOZ_SOURCE_MOUSE;
}
WidgetMouseEvent event(true, msg, widget,
aIsWidgetEventSynthesized ?
WidgetMouseEvent::eSynthesized :
WidgetMouseEvent::eReal,
contextMenuKey ? WidgetMouseEvent::eContextMenuKey :
WidgetMouseEvent::eNormal);
event.pointerId = aIdentifier;
event.mModifiers = GetWidgetModifiers(aModifiers);
event.button = aButton;
event.buttons = aButtons != nsIDOMWindowUtils::MOUSE_BUTTONS_NOT_SPECIFIED ?
aButtons :
msg == eMouseUp ? 0 : GetButtonsFlagForButton(aButton);
event.pressure = aPressure;
event.inputSource = aInputSourceArg;
event.mClickCount = aClickCount;
event.mTime = PR_IntervalNow();
event.mFlags.mIsSynthesizedForTests = aIsDOMEventSynthesized;
event.mExitFrom = exitFrom;
nsPresContext* presContext = aPresShell->GetPresContext();
if (!presContext)
return NS_ERROR_FAILURE;
event.mRefPoint = ToWidgetPoint(CSSPoint(aX, aY), offset, presContext);
event.mIgnoreRootScrollFrame = aIgnoreRootScrollFrame;
nsEventStatus status = nsEventStatus_eIgnore;
if (aToWindow) {
nsCOMPtr<nsIPresShell> presShell;
nsView* view = GetViewToDispatchEvent(presContext, getter_AddRefs(presShell));
if (!presShell || !view) {
return NS_ERROR_FAILURE;
}
return presShell->HandleEvent(view->GetFrame(), &event, false, &status);
}
if (gfxPrefs::TestEventsAsyncEnabled()) {
status = widget->DispatchInputEvent(&event);
} else {
nsresult rv = widget->DispatchEvent(&event, status);
NS_ENSURE_SUCCESS(rv, rv);
}
if (aPreventDefault) {
*aPreventDefault = (status == nsEventStatus_eConsumeNoDefault);
}
return NS_OK;
}
/* static */
void
nsContentUtils::FirePageHideEvent(nsIDocShellTreeItem* aItem,
EventTarget* aChromeEventHandler,
bool aOnlySystemGroup)
{
nsCOMPtr<nsIDocument> doc = aItem->GetDocument();
NS_ASSERTION(doc, "What happened here?");
doc->OnPageHide(true, aChromeEventHandler, aOnlySystemGroup);
int32_t childCount = 0;
aItem->GetChildCount(&childCount);
AutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids;
kids.AppendElements(childCount);
for (int32_t i = 0; i < childCount; ++i) {
aItem->GetChildAt(i, getter_AddRefs(kids[i]));
}
for (uint32_t i = 0; i < kids.Length(); ++i) {
if (kids[i]) {
FirePageHideEvent(kids[i], aChromeEventHandler, aOnlySystemGroup);
}
}
}
// The pageshow event is fired for a given document only if IsShowing() returns
// the same thing as aFireIfShowing. This gives us a way to fire pageshow only
// on documents that are still loading or only on documents that are already
// loaded.
/* static */
void
nsContentUtils::FirePageShowEvent(nsIDocShellTreeItem* aItem,
EventTarget* aChromeEventHandler,
bool aFireIfShowing,
bool aOnlySystemGroup)
{
int32_t childCount = 0;
aItem->GetChildCount(&childCount);
AutoTArray<nsCOMPtr<nsIDocShellTreeItem>, 8> kids;
kids.AppendElements(childCount);
for (int32_t i = 0; i < childCount; ++i) {
aItem->GetChildAt(i, getter_AddRefs(kids[i]));
}
for (uint32_t i = 0; i < kids.Length(); ++i) {
if (kids[i]) {
FirePageShowEvent(kids[i], aChromeEventHandler, aFireIfShowing,
aOnlySystemGroup);
}
}
nsCOMPtr<nsIDocument> doc = aItem->GetDocument();
NS_ASSERTION(doc, "What happened here?");
if (doc->IsShowing() == aFireIfShowing) {
doc->OnPageShow(true, aChromeEventHandler, aOnlySystemGroup);
}
}
/* static */
already_AddRefed<nsPIWindowRoot>
nsContentUtils::GetWindowRoot(nsIDocument* aDoc)
{
if (aDoc) {
if (nsPIDOMWindowOuter* win = aDoc->GetWindow()) {
return win->GetTopWindowRoot();
}
}
return nullptr;
}
/* static */
bool
nsContentUtils::IsPreloadType(nsContentPolicyType aType)
{
return (aType == nsIContentPolicy::TYPE_INTERNAL_SCRIPT_PRELOAD ||
aType == nsIContentPolicy::TYPE_INTERNAL_IMAGE_PRELOAD ||
aType == nsIContentPolicy::TYPE_INTERNAL_STYLESHEET_PRELOAD);
}
/* static */
bool
nsContentUtils::IsUpgradableDisplayType(nsContentPolicyType aType)
{
MOZ_ASSERT(NS_IsMainThread());
return (aType == nsIContentPolicy::TYPE_IMAGE ||
aType == nsIContentPolicy::TYPE_MEDIA);
}
nsresult
nsContentUtils::SetFetchReferrerURIWithPolicy(nsIPrincipal* aPrincipal,
nsIDocument* aDoc,
nsIHttpChannel* aChannel,
mozilla::net::ReferrerPolicy aReferrerPolicy)
{
NS_ENSURE_ARG_POINTER(aPrincipal);
NS_ENSURE_ARG_POINTER(aChannel);
nsCOMPtr<nsIURI> principalURI;
if (IsSystemPrincipal(aPrincipal)) {
return NS_OK;
}
aPrincipal->GetURI(getter_AddRefs(principalURI));
if (!aDoc) {
return aChannel->SetReferrerWithPolicy(principalURI, aReferrerPolicy);
}
// If it weren't for history.push/replaceState, we could just use the
// principal's URI here. But since we want changes to the URI effected
// by push/replaceState to be reflected in the XHR referrer, we have to
// be more clever.
//
// If the document's original URI (before any push/replaceStates) matches
// our principal, then we use the document's current URI (after
// push/replaceStates). Otherwise (if the document is, say, a data:
// URI), we just use the principal's URI.
nsCOMPtr<nsIURI> docCurURI = aDoc->GetDocumentURI();
nsCOMPtr<nsIURI> docOrigURI = aDoc->GetOriginalURI();
nsCOMPtr<nsIURI> referrerURI;
if (principalURI && docCurURI && docOrigURI) {
bool equal = false;
principalURI->Equals(docOrigURI, &equal);
if (equal) {
referrerURI = docCurURI;
}
}
if (!referrerURI) {
referrerURI = principalURI;
}
return aChannel->SetReferrerWithPolicy(referrerURI, aReferrerPolicy);
}
// static
net::ReferrerPolicy
nsContentUtils::GetReferrerPolicyFromHeader(const nsAString& aHeader)
{
// Multiple headers could be concatenated into one comma-separated
// list of policies. Need to tokenize the multiple headers.
nsCharSeparatedTokenizer tokenizer(aHeader, ',');
nsAutoString token;
net::ReferrerPolicy referrerPolicy = mozilla::net::RP_Unset;
while (tokenizer.hasMoreTokens()) {
token = tokenizer.nextToken();
if (token.IsEmpty()) {
continue;
}
net::ReferrerPolicy policy = net::ReferrerPolicyFromString(token);
if (policy != net::RP_Unset) {
referrerPolicy = policy;
}
}
return referrerPolicy;
}
// static
bool
nsContentUtils::IsNonSubresourceRequest(nsIChannel* aChannel)
{
nsLoadFlags loadFlags = 0;
aChannel->GetLoadFlags(&loadFlags);
if (loadFlags & nsIChannel::LOAD_DOCUMENT_URI) {
return true;
}
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
if (!loadInfo) {
return false;
}
nsContentPolicyType type = loadInfo->InternalContentPolicyType();
return IsNonSubresourceInternalPolicyType(type);
}
// static
bool
nsContentUtils::IsNonSubresourceInternalPolicyType(nsContentPolicyType aType)
{
return aType == nsIContentPolicy::TYPE_DOCUMENT ||
aType == nsIContentPolicy::TYPE_INTERNAL_IFRAME ||
aType == nsIContentPolicy::TYPE_INTERNAL_FRAME ||
aType == nsIContentPolicy::TYPE_INTERNAL_WORKER ||
aType == nsIContentPolicy::TYPE_INTERNAL_SHARED_WORKER;
}
// static, public
nsContentUtils::StorageAccess
nsContentUtils::StorageAllowedForWindow(nsPIDOMWindowInner* aWindow)
{
if (nsIDocument* document = aWindow->GetExtantDoc()) {
nsCOMPtr<nsIPrincipal> principal = document->NodePrincipal();
// Note that GetChannel() below may return null, but that's OK, since the
// callee is able to deal with a null channel argument, and if passed null,
// will only fail to notify the UI in case storage gets blocked.
nsIChannel* channel = document->GetChannel();
return InternalStorageAllowedForPrincipal(principal, aWindow, nullptr,
channel);
}
return StorageAccess::eDeny;
}
// static, public
nsContentUtils::StorageAccess
nsContentUtils::StorageAllowedForDocument(nsIDocument* aDoc)
{
MOZ_ASSERT(aDoc);
if (nsPIDOMWindowInner* inner = aDoc->GetInnerWindow()) {
nsCOMPtr<nsIPrincipal> principal = aDoc->NodePrincipal();
// Note that GetChannel() below may return null, but that's OK, since the
// callee is able to deal with a null channel argument, and if passed null,
// will only fail to notify the UI in case storage gets blocked.
nsIChannel* channel = aDoc->GetChannel();
return InternalStorageAllowedForPrincipal(principal, inner, nullptr,
channel);
}
return StorageAccess::eDeny;
}
// static, public
nsContentUtils::StorageAccess
nsContentUtils::StorageAllowedForNewWindow(nsIPrincipal* aPrincipal,
nsIURI* aURI,
nsPIDOMWindowInner* aParent)
{
MOZ_ASSERT(aPrincipal);
MOZ_ASSERT(aURI);
// parent may be nullptr
return InternalStorageAllowedForPrincipal(aPrincipal, aParent, aURI, nullptr);
}
// static, public
nsContentUtils::StorageAccess
nsContentUtils::StorageAllowedForChannel(nsIChannel* aChannel)
{
MOZ_DIAGNOSTIC_ASSERT(sSecurityManager);
MOZ_DIAGNOSTIC_ASSERT(aChannel);
nsCOMPtr<nsIPrincipal> principal;
Unused << sSecurityManager->GetChannelResultPrincipal(aChannel,
getter_AddRefs(principal));
NS_ENSURE_TRUE(principal, nsContentUtils::StorageAccess::eDeny);
nsContentUtils::StorageAccess result =
InternalStorageAllowedForPrincipal(principal, nullptr, nullptr, aChannel);
return result;
}
// static, public
nsContentUtils::StorageAccess
nsContentUtils::StorageAllowedForPrincipal(nsIPrincipal* aPrincipal)
{
return InternalStorageAllowedForPrincipal(aPrincipal, nullptr, nullptr,
nullptr);
}
// static, private
void
nsContentUtils::GetCookieLifetimePolicyForPrincipal(nsIPrincipal* aPrincipal,
uint32_t* aLifetimePolicy)
{
*aLifetimePolicy = sCookiesLifetimePolicy;
// Any permissions set for the given principal will override our default
// settings from preferences.
nsCOMPtr<nsIPermissionManager> permissionManager =
services::GetPermissionManager();
if (!permissionManager) {
return;
}
uint32_t perm;
permissionManager->TestPermissionFromPrincipal(aPrincipal, "cookie", &perm);
switch (perm) {
case nsICookiePermission::ACCESS_ALLOW:
*aLifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
break;
case nsICookiePermission::ACCESS_DENY:
*aLifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
break;
case nsICookiePermission::ACCESS_SESSION:
*aLifetimePolicy = nsICookieService::ACCEPT_SESSION;
break;
case nsICookiePermission::ACCESS_ALLOW_FIRST_PARTY_ONLY:
// NOTE: The decision was made here to override the lifetime policy to be
// ACCEPT_NORMALLY for consistency with ACCESS_ALLOW, but this does
// prevent us from expressing BEHAVIOR_REJECT_FOREIGN/ACCEPT_SESSION for a
// specific domain. As BEHAVIOR_REJECT_FOREIGN isn't visible in our UI,
// this is probably not an issue.
*aLifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
break;
case nsICookiePermission::ACCESS_LIMIT_THIRD_PARTY:
// NOTE: The decision was made here to override the lifetime policy to be
// ACCEPT_NORMALLY for consistency with ACCESS_ALLOW, but this does
// prevent us from expressing BEHAVIOR_REJECT_FOREIGN/ACCEPT_SESSION for a
// specific domain. As BEHAVIOR_LIMIT_FOREIGN isn't visible in our UI,
// this is probably not an issue.
*aLifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
break;
}
}
// static public
bool
nsContentUtils::IsThirdPartyWindowOrChannel(nsPIDOMWindowInner* aWindow,
nsIChannel* aChannel,
nsIURI* aURI)
{
MOZ_ASSERT(!aWindow || !aChannel,
"A window and channel should not both be provided.");
nsCOMPtr<mozIThirdPartyUtil> thirdPartyUtil = services::GetThirdPartyUtil();
if (!thirdPartyUtil) {
return false;
}
// In the absence of a window or channel, we assume that we are first-party.
bool thirdParty = false;
if (aWindow) {
Unused << thirdPartyUtil->IsThirdPartyWindow(aWindow->GetOuterWindow(),
aURI,
&thirdParty);
}
if (aChannel) {
// Note, we must call IsThirdPartyChannel() here and not just try to
// use nsILoadInfo.isThirdPartyContext. That nsILoadInfo property only
// indicates if the parent loading window is third party or not. We
// want to check the channel URI against the loading principal as well.
Unused << thirdPartyUtil->IsThirdPartyChannel(aChannel,
nullptr,
&thirdParty);
}
return thirdParty;
}
// static public
bool
nsContentUtils::IsTrackingResourceWindow(nsPIDOMWindowInner* aWindow)
{
MOZ_ASSERT(aWindow);
nsIDocument* document = aWindow->GetExtantDoc();
if (!document) {
return false;
}
nsCOMPtr<nsIHttpChannel> httpChannel =
do_QueryInterface(document->GetChannel());
if (!httpChannel) {
return false;
}
return httpChannel->GetIsTrackingResource();
}
static bool
StorageDisabledByAntiTrackingInternal(nsPIDOMWindowInner* aWindow,
nsIChannel* aChannel,
nsIPrincipal* aPrincipal,
nsIURI* aURI,
uint32_t* aRejectedReason)
{
MOZ_ASSERT(aWindow || aChannel || aPrincipal);
if (aWindow) {
nsIURI* documentURI = aURI ? aURI : aWindow->GetDocumentURI();
return !documentURI ||
!AntiTrackingCommon::IsFirstPartyStorageAccessGrantedFor(aWindow,
documentURI,
aRejectedReason);
}
if (aChannel) {
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aChannel);
if (!httpChannel) {
return false;
}
nsCOMPtr<nsIURI> uri;
nsresult rv = httpChannel->GetURI(getter_AddRefs(uri));
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
return !AntiTrackingCommon::IsFirstPartyStorageAccessGrantedFor(httpChannel,
uri,
aRejectedReason);
}
MOZ_ASSERT(aPrincipal);
return !AntiTrackingCommon::IsFirstPartyStorageAccessGrantedFor(aPrincipal);
}
// static public
bool
nsContentUtils::StorageDisabledByAntiTracking(nsPIDOMWindowInner* aWindow,
nsIChannel* aChannel,
nsIPrincipal* aPrincipal,
nsIURI* aURI)
{
uint32_t rejectedReason = 0;
bool disabled =
StorageDisabledByAntiTrackingInternal(aWindow, aChannel, aPrincipal, aURI,
&rejectedReason);
if (disabled && sAntiTrackingControlCenterUIEnabled && rejectedReason) {
if (aWindow) {
AntiTrackingCommon::NotifyRejection(aWindow, rejectedReason);
} else if (aChannel) {
AntiTrackingCommon::NotifyRejection(aChannel, rejectedReason);
}
}
return disabled;
}
// static, private
nsContentUtils::StorageAccess
nsContentUtils::InternalStorageAllowedForPrincipal(nsIPrincipal* aPrincipal,
nsPIDOMWindowInner* aWindow,
nsIURI* aURI,
nsIChannel* aChannel)
{
MOZ_ASSERT(aPrincipal);
StorageAccess access = StorageAccess::eAllow;
// We don't allow storage on the null principal, in general. Even if the
// calling context is chrome.
if (aPrincipal->GetIsNullPrincipal()) {
return StorageAccess::eDeny;
}
if (aWindow) {
// If the document is sandboxed, then it is not permitted to use storage
nsIDocument* document = aWindow->GetExtantDoc();
if (document && document->GetSandboxFlags() & SANDBOXED_ORIGIN) {
return StorageAccess::eDeny;
}
// Check if we are in private browsing, and record that fact
if (IsInPrivateBrowsing(document)) {
access = StorageAccess::ePrivateBrowsing;
}
}
uint32_t lifetimePolicy;
// WebExtensions principals always get BEHAVIOR_ACCEPT as cookieBehavior
// and ACCEPT_NORMALLY as lifetimePolicy (See Bug 1406675 for rationale).
auto policy = BasePrincipal::Cast(aPrincipal)->AddonPolicy();
if (policy) {
lifetimePolicy = nsICookieService::ACCEPT_NORMALLY;
} else {
GetCookieLifetimePolicyForPrincipal(aPrincipal, &lifetimePolicy);
}
// Check if we should only allow storage for the session, and record that fact
if (lifetimePolicy == nsICookieService::ACCEPT_SESSION) {
// Storage could be StorageAccess::ePrivateBrowsing or StorageAccess::eAllow
// so perform a std::min comparison to make sure we preserve ePrivateBrowsing
// if it has been set.
access = std::min(StorageAccess::eSessionScoped, access);
}
// About URIs are allowed to access storage, even if they don't have chrome
// privileges. If this is not desired, than the consumer will have to
// implement their own restriction functionality.
//
// This is due to backwards-compatibility and the state of storage access before
// the introducton of nsContentUtils::InternalStorageAllowedForPrincipal:
//
// BEFORE:
// localStorage, caches: allowed in 3rd-party iframes always
// IndexedDB: allowed in 3rd-party iframes only if 3rd party URI is an about:
// URI within a specific whitelist
//
// AFTER:
// localStorage, caches: allowed in 3rd-party iframes by default. Preference
// can be set to disable in 3rd-party, which will not disallow in about: URIs.
// IndexedDB: allowed in 3rd-party iframes by default. Preference can be set to
// disable in 3rd-party, which will disallow in about: URIs, unless they are
// within a specific whitelist.
//
// This means that behavior for storage with internal about: URIs should not be
// affected, which is desireable due to the lack of automated testing for about:
// URIs with these preferences set, and the importance of the correct functioning
// of these URIs even with custom preferences.
nsCOMPtr<nsIURI> uri = aURI;
if (!uri) {
Unused << aPrincipal->GetURI(getter_AddRefs(uri));
}
if (uri) {
bool isAbout = false;
MOZ_ALWAYS_SUCCEEDS(uri->SchemeIs("about", &isAbout));
if (isAbout) {
return access;
}
}
if (StorageDisabledByAntiTracking(aWindow, aChannel, aPrincipal, aURI)) {
return StorageAccess::eDeny;
}
return access;
}
namespace {
// We put StringBuilder in the anonymous namespace to prevent anything outside
// this file from accidentally being linked against it.
class StringBuilder
{
private:
// Try to keep the size of StringBuilder close to a jemalloc bucket size.
static const uint32_t STRING_BUFFER_UNITS = 1020;
class Unit
{
public:
Unit() : mAtom(nullptr), mType(eUnknown), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder::Unit);
}
~Unit()
{
if (mType == eString || mType == eStringWithEncode) {
delete mString;
}
MOZ_COUNT_DTOR(StringBuilder::Unit);
}
enum Type
{
eUnknown,
eAtom,
eString,
eStringWithEncode,
eLiteral,
eTextFragment,
eTextFragmentWithEncode,
};
union
{
nsAtom* mAtom;
const char* mLiteral;
nsAutoString* mString;
const nsTextFragment* mTextFragment;
};
Type mType;
uint32_t mLength;
};
public:
StringBuilder() : mLast(this), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder);
}
~StringBuilder()
{
MOZ_COUNT_DTOR(StringBuilder);
}
void Append(nsAtom* aAtom)
{
Unit* u = AddUnit();
u->mAtom = aAtom;
u->mType = Unit::eAtom;
uint32_t len = aAtom->GetLength();
u->mLength = len;
mLength += len;
}
template<int N>
void Append(const char (&aLiteral)[N])
{
Unit* u = AddUnit();
u->mLiteral = aLiteral;
u->mType = Unit::eLiteral;
uint32_t len = N - 1;
u->mLength = len;
mLength += len;
}
template<int N>
void Append(char (&aLiteral)[N])
{
Unit* u = AddUnit();
u->mLiteral = aLiteral;
u->mType = Unit::eLiteral;
uint32_t len = N - 1;
u->mLength = len;
mLength += len;
}
void Append(const nsAString& aString)
{
Unit* u = AddUnit();
u->mString = new nsAutoString(aString);
u->mType = Unit::eString;
uint32_t len = aString.Length();
u->mLength = len;
mLength += len;
}
void Append(nsAutoString* aString)
{
Unit* u = AddUnit();
u->mString = aString;
u->mType = Unit::eString;
uint32_t len = aString->Length();
u->mLength = len;
mLength += len;
}
void AppendWithAttrEncode(nsAutoString* aString, uint32_t aLen)
{
Unit* u = AddUnit();
u->mString = aString;
u->mType = Unit::eStringWithEncode;
u->mLength = aLen;
mLength += aLen;
}
void Append(const nsTextFragment* aTextFragment)
{
Unit* u = AddUnit();
u->mTextFragment = aTextFragment;
u->mType = Unit::eTextFragment;
uint32_t len = aTextFragment->GetLength();
u->mLength = len;
mLength += len;
}
void AppendWithEncode(const nsTextFragment* aTextFragment, uint32_t aLen)
{
Unit* u = AddUnit();
u->mTextFragment = aTextFragment;
u->mType = Unit::eTextFragmentWithEncode;
u->mLength = aLen;
mLength += aLen;
}
bool ToString(nsAString& aOut)
{
if (!aOut.SetCapacity(mLength, fallible)) {
return false;
}
for (StringBuilder* current = this; current; current = current->mNext) {
uint32_t len = current->mUnits.Length();
for (uint32_t i = 0; i < len; ++i) {
Unit& u = current->mUnits[i];
switch (u.mType) {
case Unit::eAtom:
aOut.Append(nsDependentAtomString(u.mAtom));
break;
case Unit::eString:
aOut.Append(*(u.mString));
break;
case Unit::eStringWithEncode:
EncodeAttrString(*(u.mString), aOut);
break;
case Unit::eLiteral:
aOut.AppendASCII(u.mLiteral, u.mLength);
break;
case Unit::eTextFragment:
u.mTextFragment->AppendTo(aOut);
break;
case Unit::eTextFragmentWithEncode:
EncodeTextFragment(u.mTextFragment, aOut);
break;
default:
MOZ_CRASH("Unknown unit type?");
}
}
}
return true;
}
private:
Unit* AddUnit()
{
if (mLast->mUnits.Length() == STRING_BUFFER_UNITS) {
new StringBuilder(this);
}
return mLast->mUnits.AppendElement();
}
explicit StringBuilder(StringBuilder* aFirst)
: mLast(nullptr), mLength(0)
{
MOZ_COUNT_CTOR(StringBuilder);
aFirst->mLast->mNext = this;
aFirst->mLast = this;
}
void EncodeAttrString(const nsAutoString& aValue, nsAString& aOut)
{
const char16_t* c = aValue.BeginReading();
const char16_t* end = aValue.EndReading();
while (c < end) {
switch (*c) {
case '"':
aOut.AppendLiteral("&quot;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(*c);
break;
}
++c;
}
}
void EncodeTextFragment(const nsTextFragment* aValue, nsAString& aOut)
{
uint32_t len = aValue->GetLength();
if (aValue->Is2b()) {
const char16_t* data = aValue->Get2b();
for (uint32_t i = 0; i < len; ++i) {
const char16_t c = data[i];
switch (c) {
case '<':
aOut.AppendLiteral("&lt;");
break;
case '>':
aOut.AppendLiteral("&gt;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(c);
break;
}
}
} else {
const char* data = aValue->Get1b();
for (uint32_t i = 0; i < len; ++i) {
const unsigned char c = data[i];
switch (c) {
case '<':
aOut.AppendLiteral("&lt;");
break;
case '>':
aOut.AppendLiteral("&gt;");
break;
case '&':
aOut.AppendLiteral("&amp;");
break;
case 0x00A0:
aOut.AppendLiteral("&nbsp;");
break;
default:
aOut.Append(c);
break;
}
}
}
}
AutoTArray<Unit, STRING_BUFFER_UNITS> mUnits;
nsAutoPtr<StringBuilder> mNext;
StringBuilder* mLast;
// mLength is used only in the first StringBuilder object in the linked list.
uint32_t mLength;
};
} // namespace
static void
AppendEncodedCharacters(const nsTextFragment* aText, StringBuilder& aBuilder)
{
uint32_t extraSpaceNeeded = 0;
uint32_t len = aText->GetLength();
if (aText->Is2b()) {
const char16_t* data = aText->Get2b();
for (uint32_t i = 0; i < len; ++i) {
const char16_t c = data[i];
switch (c) {
case '<':
extraSpaceNeeded += ArrayLength("&lt;") - 2;
break;
case '>':
extraSpaceNeeded += ArrayLength("&gt;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
}
} else {
const char* data = aText->Get1b();
for (uint32_t i = 0; i < len; ++i) {
const unsigned char c = data[i];
switch (c) {
case '<':
extraSpaceNeeded += ArrayLength("&lt;") - 2;
break;
case '>':
extraSpaceNeeded += ArrayLength("&gt;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
}
}
if (extraSpaceNeeded) {
aBuilder.AppendWithEncode(aText, len + extraSpaceNeeded);
} else {
aBuilder.Append(aText);
}
}
static void
AppendEncodedAttributeValue(nsAutoString* aValue, StringBuilder& aBuilder)
{
const char16_t* c = aValue->BeginReading();
const char16_t* end = aValue->EndReading();
uint32_t extraSpaceNeeded = 0;
while (c < end) {
switch (*c) {
case '"':
extraSpaceNeeded += ArrayLength("&quot;") - 2;
break;
case '&':
extraSpaceNeeded += ArrayLength("&amp;") - 2;
break;
case 0x00A0:
extraSpaceNeeded += ArrayLength("&nbsp;") - 2;
break;
default:
break;
}
++c;
}
if (extraSpaceNeeded) {
aBuilder.AppendWithAttrEncode(aValue, aValue->Length() + extraSpaceNeeded);
} else {
aBuilder.Append(aValue);
}
}
static void
StartElement(Element* aContent, StringBuilder& aBuilder)
{
nsAtom* localName = aContent->NodeInfo()->NameAtom();
int32_t tagNS = aContent->GetNameSpaceID();
aBuilder.Append("<");
if (aContent->IsHTMLElement() || aContent->IsSVGElement() ||
aContent->IsMathMLElement()) {
aBuilder.Append(localName);
} else {
aBuilder.Append(aContent->NodeName());
}
CustomElementData* ceData = aContent->GetCustomElementData();
if (ceData) {
nsAtom* isAttr = ceData->GetIs(aContent);
if (isAttr && !aContent->HasAttr(kNameSpaceID_None, nsGkAtoms::is)) {
aBuilder.Append(R"( is=")");
aBuilder.Append(nsDependentAtomString(isAttr));
aBuilder.Append(R"(")");
}
}
int32_t count = aContent->GetAttrCount();
for (int32_t i = 0; i < count; i++) {
const nsAttrName* name = aContent->GetAttrNameAt(i);
int32_t attNs = name->NamespaceID();
nsAtom* attName = name->LocalName();
// Filter out any attribute starting with [-|_]moz
nsDependentAtomString attrNameStr(attName);
if (StringBeginsWith(attrNameStr, NS_LITERAL_STRING("_moz")) ||
StringBeginsWith(attrNameStr, NS_LITERAL_STRING("-moz"))) {
continue;
}
auto* attValue = new nsAutoString();
aContent->GetAttr(attNs, attName, *attValue);
// Filter out special case of <br type="_moz*"> used by the editor.
// Bug 16988. Yuck.
if (localName == nsGkAtoms::br && tagNS == kNameSpaceID_XHTML &&
attName == nsGkAtoms::type && attNs == kNameSpaceID_None &&
StringBeginsWith(*attValue, NS_LITERAL_STRING("_moz"))) {
delete attValue;
continue;
}
aBuilder.Append(" ");
if (MOZ_LIKELY(attNs == kNameSpaceID_None) ||
(attNs == kNameSpaceID_XMLNS &&
attName == nsGkAtoms::xmlns)) {
// Nothing else required
} else if (attNs == kNameSpaceID_XML) {
aBuilder.Append("xml:");
} else if (attNs == kNameSpaceID_XMLNS) {
aBuilder.Append("xmlns:");
} else if (attNs == kNameSpaceID_XLink) {
aBuilder.Append("xlink:");
} else {
nsAtom* prefix = name->GetPrefix();
if (prefix) {
aBuilder.Append(prefix);
aBuilder.Append(":");
}
}
aBuilder.Append(attName);
aBuilder.Append(R"(=")");
AppendEncodedAttributeValue(attValue, aBuilder);
aBuilder.Append(R"(")");
}
aBuilder.Append(">");
/*
// Per HTML spec we should append one \n if the first child of
// pre/textarea/listing is a textnode and starts with a \n.
// But because browsers haven't traditionally had that behavior,
// we're not changing our behavior either - yet.
if (aContent->IsHTMLElement()) {
if (localName == nsGkAtoms::pre || localName == nsGkAtoms::textarea ||
localName == nsGkAtoms::listing) {
nsIContent* fc = aContent->GetFirstChild();
if (fc &&
(fc->NodeType() == nsINode::TEXT_NODE ||
fc->NodeType() == nsINode::CDATA_SECTION_NODE)) {
const nsTextFragment* text = fc->GetText();
if (text && text->GetLength() && text->CharAt(0) == char16_t('\n')) {
aBuilder.Append("\n");
}
}
}
}*/
}
static inline bool
ShouldEscape(nsIContent* aParent)
{
if (!aParent || !aParent->IsHTMLElement()) {
return true;
}
static const nsAtom* nonEscapingElements[] = {
nsGkAtoms::style, nsGkAtoms::script, nsGkAtoms::xmp,
nsGkAtoms::iframe, nsGkAtoms::noembed, nsGkAtoms::noframes,
nsGkAtoms::plaintext,
// Per the current spec noscript should be escaped in case
// scripts are disabled or if document doesn't have
// browsing context. However the latter seems to be a spec bug
// and Gecko hasn't traditionally done the former.
nsGkAtoms::noscript
};
static mozilla::BloomFilter<12, nsAtom> sFilter;
static bool sInitialized = false;
if (!sInitialized) {
sInitialized = true;
for (auto& nonEscapingElement : nonEscapingElements) {
sFilter.add(nonEscapingElement);
}
}
nsAtom* tag = aParent->NodeInfo()->NameAtom();
if (sFilter.mightContain(tag)) {
for (auto& nonEscapingElement : nonEscapingElements) {
if (tag == nonEscapingElement) {
return false;
}
}
}
return true;
}
static inline bool
IsVoidTag(Element* aElement)
{
if (!aElement->IsHTMLElement()) {
return false;
}
return FragmentOrElement::IsHTMLVoid(aElement->NodeInfo()->NameAtom());
}
bool
nsContentUtils::SerializeNodeToMarkup(nsINode* aRoot,
bool aDescendentsOnly,
nsAString& aOut)
{
// If you pass in a DOCUMENT_NODE, you must pass aDescendentsOnly as true
MOZ_ASSERT(aDescendentsOnly ||
aRoot->NodeType() != nsINode::DOCUMENT_NODE);
nsINode* current = aDescendentsOnly ?
nsNodeUtils::GetFirstChildOfTemplateOrNode(aRoot) : aRoot;
if (!current) {
return true;
}
StringBuilder builder;
nsIContent* next;
while (true) {
bool isVoid = false;
switch (current->NodeType()) {
case nsINode::ELEMENT_NODE: {
Element* elem = current->AsElement();
StartElement(elem, builder);
isVoid = IsVoidTag(elem);
if (!isVoid &&
(next = nsNodeUtils::GetFirstChildOfTemplateOrNode(current))) {
current = next;
continue;
}
break;
}
case nsINode::TEXT_NODE:
case nsINode::CDATA_SECTION_NODE: {
const nsTextFragment* text = static_cast<nsIContent*>(current)->GetText();
nsIContent* parent = current->GetParent();
if (ShouldEscape(parent)) {
AppendEncodedCharacters(text, builder);
} else {
builder.Append(text);
}
break;
}
case nsINode::COMMENT_NODE: {
builder.Append("<!--");
builder.Append(static_cast<nsIContent*>(current)->GetText());
builder.Append("-->");
break;
}
case nsINode::DOCUMENT_TYPE_NODE: {
builder.Append("<!DOCTYPE ");
builder.Append(current->NodeName());
builder.Append(">");
break;
}
case nsINode::PROCESSING_INSTRUCTION_NODE: {
builder.Append("<?");
builder.Append(current->NodeName());
builder.Append(" ");
builder.Append(static_cast<nsIContent*>(current)->GetText());
builder.Append(">");
break;
}
}
while (true) {
if (!isVoid && current->NodeType() == nsINode::ELEMENT_NODE) {
builder.Append("</");
nsIContent* elem = static_cast<nsIContent*>(current);
if (elem->IsHTMLElement() || elem->IsSVGElement() ||
elem->IsMathMLElement()) {
builder.Append(elem->NodeInfo()->NameAtom());
} else {
builder.Append(current->NodeName());
}
builder.Append(">");
}
isVoid = false;
if (current == aRoot) {
return builder.ToString(aOut);
}
if ((next = current->GetNextSibling())) {
current = next;
break;
}
current = current->GetParentNode();
// Handle template element. If the parent is a template's content,
// then adjust the parent to be the template element.
if (current != aRoot &&
current->NodeType() == nsINode::DOCUMENT_FRAGMENT_NODE) {
DocumentFragment* frag = static_cast<DocumentFragment*>(current);
nsIContent* fragHost = frag->GetHost();
if (fragHost && nsNodeUtils::IsTemplateElement(fragHost)) {
current = fragHost;
}
}
if (aDescendentsOnly && current == aRoot) {
return builder.ToString(aOut);
}
}
}
}
bool
nsContentUtils::IsSpecificAboutPage(JSObject* aGlobal, const char* aUri)
{
// aUri must start with about: or this isn't the right function to be using.
MOZ_ASSERT(strncmp(aUri, "about:", 6) == 0);
// Make sure the global is a window
MOZ_DIAGNOSTIC_ASSERT(JS_IsGlobalObject(aGlobal));
nsGlobalWindowInner* win = xpc::WindowOrNull(aGlobal);
if (!win) {
return false;
}
nsCOMPtr<nsIPrincipal> principal = win->GetPrincipal();
NS_ENSURE_TRUE(principal, false);
nsCOMPtr<nsIURI> uri;
principal->GetURI(getter_AddRefs(uri));
if (!uri) {
return false;
}
// First check the scheme to avoid getting long specs in the common case.
bool isAbout = false;
uri->SchemeIs("about", &isAbout);
if (!isAbout) {
return false;
}
// Now check the spec itself
nsAutoCString spec;
uri->GetSpecIgnoringRef(spec);
return spec.EqualsASCII(aUri);
}
/* static */ void
nsContentUtils::SetScrollbarsVisibility(nsIDocShell* aDocShell, bool aVisible)
{
nsCOMPtr<nsIScrollable> scroller = do_QueryInterface(aDocShell);
if (scroller) {
int32_t prefValue;
if (aVisible) {
prefValue = nsIScrollable::Scrollbar_Auto;
} else {
prefValue = nsIScrollable::Scrollbar_Never;
}
scroller->SetDefaultScrollbarPreferences(
nsIScrollable::ScrollOrientation_Y, prefValue);
scroller->SetDefaultScrollbarPreferences(
nsIScrollable::ScrollOrientation_X, prefValue);
}
}
/* static */ void
nsContentUtils::GetPresentationURL(nsIDocShell* aDocShell, nsAString& aPresentationUrl)
{
MOZ_ASSERT(aDocShell);
// Simulate receiver context for web platform test
if (Preferences::GetBool("dom.presentation.testing.simulate-receiver")) {
nsCOMPtr<nsIDocument> doc;
nsCOMPtr<nsPIDOMWindowOuter> docShellWin =
do_QueryInterface(aDocShell->GetScriptGlobalObject());
if (docShellWin) {
doc = docShellWin->GetExtantDoc();
}
if (NS_WARN_IF(!doc)) {
return;
}
nsCOMPtr<nsIURI> uri = doc->GetDocumentURI();
if (NS_WARN_IF(!uri)) {
return;
}
nsAutoCString uriStr;
uri->GetSpec(uriStr);
aPresentationUrl = NS_ConvertUTF8toUTF16(uriStr);
return;
}
if (XRE_IsContentProcess()) {
nsCOMPtr<nsIDocShellTreeItem> sameTypeRoot;
aDocShell->GetSameTypeRootTreeItem(getter_AddRefs(sameTypeRoot));
nsCOMPtr<nsIDocShellTreeItem> root;
aDocShell->GetRootTreeItem(getter_AddRefs(root));
if (sameTypeRoot.get() == root.get()) {
// presentation URL is stored in TabChild for the top most
// <iframe mozbrowser> in content process.
TabChild* tabChild = TabChild::GetFrom(aDocShell);
if (tabChild) {
aPresentationUrl = tabChild->PresentationURL();
}
return;
}
}
nsCOMPtr<nsILoadContext> loadContext(do_QueryInterface(aDocShell));
RefPtr<Element> topFrameElt;
loadContext->GetTopFrameElement(getter_AddRefs(topFrameElt));
if (!topFrameElt) {
return;
}
topFrameElt->GetAttribute(NS_LITERAL_STRING("mozpresentation"), aPresentationUrl);
}
/* static */ nsIDocShell*
nsContentUtils::GetDocShellForEventTarget(EventTarget* aTarget)
{
nsCOMPtr<nsPIDOMWindowInner> innerWindow;
if (nsCOMPtr<nsINode> node = do_QueryInterface(aTarget)) {
bool ignore;
innerWindow =
do_QueryInterface(node->OwnerDoc()->GetScriptHandlingObject(ignore));
} else if ((innerWindow = do_QueryInterface(aTarget))) {
// Nothing else to do
} else {
nsCOMPtr<DOMEventTargetHelper> helper = do_QueryInterface(aTarget);
if (helper) {
innerWindow = helper->GetOwner();
}
}
if (innerWindow) {
return innerWindow->GetDocShell();
}
return nullptr;
}
/*
* Note: this function only relates to figuring out HTTPS state, which is an
* input to the Secure Context algorithm. We are not actually implementing any
* part of the Secure Context algorithm itself here.
*
* This is a bit of a hack. Ideally we'd propagate HTTPS state through
* nsIChannel as described in the Fetch and HTML specs, but making channels
* know about whether they should inherit HTTPS state, propagating information
* about who the channel's "client" is, exposing GetHttpsState API on channels
* and modifying the various cache implementations to store and retrieve HTTPS
* state involves a huge amount of code (see bug 1220687). We avoid that for
* now using this function.
*
* This function takes advantage of the observation that we can return true if
* nsIContentSecurityManager::IsOriginPotentiallyTrustworthy returns true for
* the document's origin (e.g. the origin has a scheme of 'https' or host
* 'localhost' etc.). Since we generally propagate a creator document's origin
* onto data:, blob:, etc. documents, this works for them too.
*
* The scenario where this observation breaks down is sandboxing without the
* 'allow-same-origin' flag, since in this case a document is given a unique
* origin (IsOriginPotentiallyTrustworthy would return false). We handle that
* by using the origin that the document would have had had it not been
* sandboxed.
*
* DEFICIENCIES: Note that this function uses nsIScriptSecurityManager's
* getChannelResultPrincipalIfNotSandboxed, and that method's ignoring of
* sandboxing is limited to the immediate sandbox. In the case that aDocument
* should inherit its origin (e.g. data: URI) but its parent has ended up
* with a unique origin due to sandboxing further up the parent chain we may
* end up returning false when we would ideally return true (since we will
* examine the parent's origin for 'https' and not finding it.) This means
* that we may restrict the privileges of some pages unnecessarily in this
* edge case.
*/
/* static */ bool
nsContentUtils::HttpsStateIsModern(nsIDocument* aDocument)
{
if (!aDocument) {
return false;
}
nsCOMPtr<nsIPrincipal> principal = aDocument->NodePrincipal();
if (principal->GetIsSystemPrincipal()) {
return true;
}
// If aDocument is sandboxed, try and get the principal that it would have
// been given had it not been sandboxed:
if (principal->GetIsNullPrincipal() &&
(aDocument->GetSandboxFlags() & SANDBOXED_ORIGIN)) {
nsIChannel* channel = aDocument->GetChannel();
if (channel) {
nsCOMPtr<nsIScriptSecurityManager> ssm =
nsContentUtils::GetSecurityManager();
nsresult rv =
ssm->GetChannelResultPrincipalIfNotSandboxed(channel,
getter_AddRefs(principal));
if (NS_FAILED(rv)) {
return false;
}
if (principal->GetIsSystemPrincipal()) {
// If a document with the system principal is sandboxing a subdocument
// that would normally inherit the embedding element's principal (e.g.
// a srcdoc document) then the embedding document does not trust the
// content that is written to the embedded document. Unlike when the
// embedding document is https, in this case we have no indication as
// to whether the embedded document's contents are delivered securely
// or not, and the sandboxing would possibly indicate that they were
// not. To play it safe we return false here. (See bug 1162772
// comment 73-80.)
return false;
}
}
}
if (principal->GetIsNullPrincipal()) {
return false;
}
MOZ_ASSERT(principal->GetIsCodebasePrincipal());
nsCOMPtr<nsIContentSecurityManager> csm =
do_GetService(NS_CONTENTSECURITYMANAGER_CONTRACTID);
NS_WARNING_ASSERTION(csm, "csm is null");
if (csm) {
bool isTrustworthyOrigin = false;
csm->IsOriginPotentiallyTrustworthy(principal, &isTrustworthyOrigin);
if (isTrustworthyOrigin) {
return true;
}
}
return false;
}
/* static */ void
nsContentUtils::TryToUpgradeElement(Element* aElement)
{
NodeInfo* nodeInfo = aElement->NodeInfo();
RefPtr<nsAtom> typeAtom =
aElement->GetCustomElementData()->GetCustomElementType();
MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName()));
CustomElementDefinition* definition =
nsContentUtils::LookupCustomElementDefinition(nodeInfo->GetDocument(),
nodeInfo->NameAtom(),
nodeInfo->NamespaceID(),
typeAtom);
if (definition) {
nsContentUtils::EnqueueUpgradeReaction(aElement, definition);
} else {
// Add an unresolved custom element that is a candidate for upgrade when a
// custom element is connected to the document.
nsContentUtils::RegisterUnresolvedElement(aElement, typeAtom);
}
}
static void
DoCustomElementCreate(Element** aElement, nsIDocument* aDoc, NodeInfo* aNodeInfo,
CustomElementConstructor* aConstructor, ErrorResult& aRv)
{
RefPtr<Element> element =
aConstructor->Construct("Custom Element Create", aRv);
if (aRv.Failed()) {
return;
}
if (aNodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
if (!element || !element->IsHTMLElement()) {
aRv.ThrowTypeError<MSG_THIS_DOES_NOT_IMPLEMENT_INTERFACE>(NS_LITERAL_STRING("HTMLElement"));
return;
}
} else {
if (!element || !element->IsXULElement()) {
aRv.ThrowTypeError<MSG_THIS_DOES_NOT_IMPLEMENT_INTERFACE>(NS_LITERAL_STRING("XULElement"));
return;
}
}
nsAtom* localName = aNodeInfo->NameAtom();
if (aDoc != element->OwnerDoc() || element->GetParentNode() ||
element->HasChildren() || element->GetAttrCount() ||
element->NodeInfo()->NameAtom() != localName) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return;
}
element.forget(aElement);
}
/* static */ nsresult
nsContentUtils::NewXULOrHTMLElement(Element** aResult, mozilla::dom::NodeInfo* aNodeInfo,
FromParser aFromParser, nsAtom* aIsAtom,
mozilla::dom::CustomElementDefinition* aDefinition)
{
RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;
MOZ_ASSERT(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML) ||
nodeInfo->NamespaceEquals(kNameSpaceID_XUL),
"Can only create XUL or XHTML elements.");
nsAtom *name = nodeInfo->NameAtom();
int32_t tag = eHTMLTag_unknown;
bool isCustomElementName = false;
if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
tag = nsHTMLTags::CaseSensitiveAtomTagToId(name);
isCustomElementName = (tag == eHTMLTag_userdefined &&
nsContentUtils::IsCustomElementName(name, kNameSpaceID_XHTML));
} else { // kNameSpaceID_XUL
if (aIsAtom) {
// Make sure the customized built-in element to be constructed confirms
// to our naming requirement, i.e. [is] must be a dashed name and
// the tag name must not.
// if so, set isCustomElementName to false to kick off all the logics
// that pick up aIsAtom.
if (nsContentUtils::IsNameWithDash(aIsAtom) &&
!nsContentUtils::IsNameWithDash(name)) {
isCustomElementName = false;
} else {
isCustomElementName = nsContentUtils::IsCustomElementName(name, kNameSpaceID_XUL);
}
} else {
isCustomElementName = nsContentUtils::IsCustomElementName(name, kNameSpaceID_XUL);
}
}
nsAtom* tagAtom = nodeInfo->NameAtom();
nsAtom* typeAtom = nullptr;
bool isCustomElement = isCustomElementName || aIsAtom;
if (isCustomElement) {
typeAtom = isCustomElementName ? tagAtom : aIsAtom;
}
MOZ_ASSERT_IF(aDefinition, isCustomElement);
bool customElementEnabled = CustomElementRegistry::IsCustomElementEnabled(nodeInfo->GetDocument());
// https://dom.spec.whatwg.org/#concept-create-element
// We only handle the "synchronous custom elements flag is set" now.
// For the unset case (e.g. cloning a node), see bug 1319342 for that.
// Step 4.
CustomElementDefinition* definition = aDefinition;
if (customElementEnabled && isCustomElement && !definition) {
MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName()));
definition =
nsContentUtils::LookupCustomElementDefinition(nodeInfo->GetDocument(),
nodeInfo->NameAtom(),
nodeInfo->NamespaceID(),
typeAtom);
}
// It might be a problem that parser synchronously calls constructor, so filed
// bug 1378079 to figure out what we should do for parser case.
if (definition) {
/*
* Synchronous custom elements flag is determined by 3 places in spec,
* 1) create an element for a token, the flag is determined by
* "will execute script" which is not originally created
* for the HTML fragment parsing algorithm.
* 2) createElement and createElementNS, the flag is the same as
* NOT_FROM_PARSER.
* 3) clone a node, our implementation will not go into this function.
* For the unset case which is non-synchronous only applied for
* inner/outerHTML.
*/
bool synchronousCustomElements = aFromParser != dom::FROM_PARSER_FRAGMENT ||
aFromParser == dom::NOT_FROM_PARSER;
// Per discussion in https://github.com/w3c/webcomponents/issues/635,
// use entry global in those places that are called from JS APIs and use the
// node document's global object if it is called from parser.
nsIGlobalObject* global;
if (aFromParser == dom::NOT_FROM_PARSER) {
global = GetEntryGlobal();
// XUL documents always use NOT_FROM_PARSER for non-XUL elements. We can
// get the global from the document in that case.
if (!global) {
nsIDocument* doc = nodeInfo->GetDocument();
if (doc && doc->IsXULDocument()) {
global = doc->GetScopeObject();
}
}
} else {
global = nodeInfo->GetDocument()->GetScopeObject();
}
if (!global) {
// In browser chrome code, one may have access to a document which doesn't
// have scope object anymore.
return NS_ERROR_FAILURE;
}
AutoEntryScript aes(global, "create custom elements");
JSContext* cx = aes.cx();
ErrorResult rv;
// Step 5.
if (definition->IsCustomBuiltIn()) {
// SetupCustomElement() should be called with an element that don't have
// CustomElementData setup, if not we will hit the assertion in
// SetCustomElementData().
// Built-in element
if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
*aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take();
} else {
NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget()));
}
(*aResult)->SetCustomElementData(new CustomElementData(typeAtom));
if (synchronousCustomElements) {
CustomElementRegistry::Upgrade(*aResult, definition, rv);
if (rv.MaybeSetPendingException(cx)) {
aes.ReportException();
}
} else {
nsContentUtils::EnqueueUpgradeReaction(*aResult, definition);
}
return NS_OK;
}
// Step 6.1.
if (synchronousCustomElements) {
definition->mPrefixStack.AppendElement(nodeInfo->GetPrefixAtom());
DoCustomElementCreate(aResult, nodeInfo->GetDocument(), nodeInfo,
definition->mConstructor, rv);
if (rv.MaybeSetPendingException(cx)) {
if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
NS_IF_ADDREF(*aResult = NS_NewHTMLUnknownElement(nodeInfo.forget(), aFromParser));
} else {
NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget()));
}
(*aResult)->SetDefined(false);
}
definition->mPrefixStack.RemoveLastElement();
return NS_OK;
}
// Step 6.2.
if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
} else {
NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget()));
}
(*aResult)->SetCustomElementData(new CustomElementData(definition->mType));
nsContentUtils::EnqueueUpgradeReaction(*aResult, definition);
return NS_OK;
}
if (nodeInfo->NamespaceEquals(kNameSpaceID_XHTML)) {
// Per the Custom Element specification, unknown tags that are valid custom
// element names should be HTMLElement instead of HTMLUnknownElement.
if (isCustomElementName) {
NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
} else {
*aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take();
}
} else {
NS_IF_ADDREF(*aResult = nsXULElement::Construct(nodeInfo.forget()));
}
if (!*aResult) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (customElementEnabled && isCustomElement) {
(*aResult)->SetCustomElementData(new CustomElementData(typeAtom));
nsContentUtils::RegisterCallbackUpgradeElement(*aResult, typeAtom);
}
return NS_OK;
}
CustomElementRegistry*
GetCustomElementRegistry(nsIDocument* aDoc)
{
MOZ_ASSERT(aDoc);
if (!aDoc->GetDocShell()) {
return nullptr;
}
nsPIDOMWindowInner* window = aDoc->GetInnerWindow();
if (!window) {
return nullptr;
}
return window->CustomElements();
}
/* static */ CustomElementDefinition*
nsContentUtils::LookupCustomElementDefinition(nsIDocument* aDoc,
nsAtom* aNameAtom,
uint32_t aNameSpaceID,
nsAtom* aTypeAtom)
{
if (aNameSpaceID != kNameSpaceID_XUL &&
aNameSpaceID != kNameSpaceID_XHTML) {
return nullptr;
}
RefPtr<CustomElementRegistry> registry(GetCustomElementRegistry(aDoc));
if (!registry) {
return nullptr;
}
return registry->LookupCustomElementDefinition(aNameAtom, aNameSpaceID, aTypeAtom);
}
/* static */ void
nsContentUtils::RegisterCallbackUpgradeElement(Element* aElement,
nsAtom* aTypeName)
{
MOZ_ASSERT(aElement);
nsIDocument* doc = aElement->OwnerDoc();
CustomElementRegistry* registry = GetCustomElementRegistry(doc);
if (registry) {
registry->RegisterCallbackUpgradeElement(aElement, aTypeName);
}
}
/* static */ void
nsContentUtils::RegisterUnresolvedElement(Element* aElement, nsAtom* aTypeName)
{
MOZ_ASSERT(aElement);
nsIDocument* doc = aElement->OwnerDoc();
CustomElementRegistry* registry = GetCustomElementRegistry(doc);
if (registry) {
registry->RegisterUnresolvedElement(aElement, aTypeName);
}
}
/* static */ void
nsContentUtils::UnregisterUnresolvedElement(Element* aElement)
{
MOZ_ASSERT(aElement);
nsAtom* typeAtom =
aElement->GetCustomElementData()->GetCustomElementType();
nsIDocument* doc = aElement->OwnerDoc();
CustomElementRegistry* registry = GetCustomElementRegistry(doc);
if (registry) {
registry->UnregisterUnresolvedElement(aElement, typeAtom);
}
}
/* static */ void
nsContentUtils::EnqueueUpgradeReaction(Element* aElement,
CustomElementDefinition* aDefinition)
{
MOZ_ASSERT(aElement);
nsIDocument* doc = aElement->OwnerDoc();
// No DocGroup means no custom element reactions stack.
if (!doc->GetDocGroup()) {
return;
}
CustomElementReactionsStack* stack =
doc->GetDocGroup()->CustomElementReactionsStack();
stack->EnqueueUpgradeReaction(aElement, aDefinition);
}
/* static */ void
nsContentUtils::EnqueueLifecycleCallback(nsIDocument::ElementCallbackType aType,
Element* aCustomElement,
LifecycleCallbackArgs* aArgs,
LifecycleAdoptedCallbackArgs* aAdoptedCallbackArgs,
CustomElementDefinition* aDefinition)
{
// No DocGroup means no custom element reactions stack.
if (!aCustomElement->OwnerDoc()->GetDocGroup()) {
return;
}
CustomElementRegistry::EnqueueLifecycleCallback(aType, aCustomElement, aArgs,
aAdoptedCallbackArgs,
aDefinition);
}
/* static */ bool
nsContentUtils::AttemptLargeAllocationLoad(nsIHttpChannel* aChannel)
{
MOZ_ASSERT(aChannel);
nsCOMPtr<nsILoadGroup> loadGroup;
nsresult rv = aChannel->GetLoadGroup(getter_AddRefs(loadGroup));
if (NS_WARN_IF(NS_FAILED(rv) || !loadGroup)) {
return false;
}
nsCOMPtr<nsIInterfaceRequestor> callbacks;
rv = loadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
if (NS_WARN_IF(NS_FAILED(rv) || !callbacks)) {
return false;
}
nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(callbacks);
if (NS_WARN_IF(!loadContext)) {
return false;
}
nsCOMPtr<mozIDOMWindowProxy> window;
rv = loadContext->GetAssociatedWindow(getter_AddRefs(window));
if (NS_WARN_IF(NS_FAILED(rv) || !window)) {
return false;
}
nsPIDOMWindowOuter* outer = nsPIDOMWindowOuter::From(window);
if (NS_WARN_IF(!outer)) {
return false;
}
if (!XRE_IsContentProcess()) {
outer->SetLargeAllocStatus(LargeAllocStatus::NON_E10S);
return false;
}
nsIDocShell* docShell = outer->GetDocShell();
if (!docShell->GetIsOnlyToplevelInTabGroup()) {
outer->SetLargeAllocStatus(LargeAllocStatus::NOT_ONLY_TOPLEVEL_IN_TABGROUP);
return false;
}
// Get the request method, and check if it is a GET request. If it is not GET,
// then we cannot perform a large allocation load.
nsAutoCString requestMethod;
rv = aChannel->GetRequestMethod(requestMethod);
NS_ENSURE_SUCCESS(rv, false);
if (NS_WARN_IF(!requestMethod.LowerCaseEqualsLiteral("get"))) {
outer->SetLargeAllocStatus(LargeAllocStatus::NON_GET);
return false;
}
TabChild* tabChild = TabChild::GetFrom(outer->AsOuter());
NS_ENSURE_TRUE(tabChild, false);
if (tabChild->IsAwaitingLargeAlloc()) {
NS_WARNING("In a Large-Allocation TabChild, ignoring Large-Allocation header!");
tabChild->StopAwaitingLargeAlloc();
outer->SetLargeAllocStatus(LargeAllocStatus::SUCCESS);
return false;
}
// On Win32 systems, we want to behave differently, so set the isWin32 bool to
// be true iff we are on win32.
#if defined(XP_WIN) && defined(_X86_)
const bool isWin32 = true;
#else
const bool isWin32 = false;
#endif
static bool sLargeAllocForceEnable = false;
static bool sCachedLargeAllocForceEnable = false;
if (!sCachedLargeAllocForceEnable) {
sCachedLargeAllocForceEnable = true;
mozilla::Preferences::AddBoolVarCache(&sLargeAllocForceEnable,
"dom.largeAllocation.forceEnable");
}
// We want to enable the large allocation header on 32-bit windows machines,
// and disable it on other machines, while still printing diagnostic messages.
// dom.largeAllocation.forceEnable can allow you to enable the process
// switching behavior of the Large-Allocation header on non 32-bit windows
// machines.
bool largeAllocEnabled = isWin32 || sLargeAllocForceEnable;
if (!largeAllocEnabled) {
NS_WARNING("dom.largeAllocation.forceEnable not set - "
"ignoring otherwise successful Large-Allocation header.");
// On platforms which aren't WIN32, we don't activate the largeAllocation
// header, instead we simply emit diagnostics into the console.
outer->SetLargeAllocStatus(LargeAllocStatus::NON_WIN32);
return false;
}
// At this point the fress process load should succeed! We just need to get
// ourselves a nsIWebBrowserChrome3 to ask to perform the reload. We should
// have one, as we have already confirmed that we are running in a content
// process.
nsCOMPtr<nsIDocShellTreeOwner> treeOwner;
docShell->GetTreeOwner(getter_AddRefs(treeOwner));
NS_ENSURE_TRUE(treeOwner, false);
nsCOMPtr<nsIWebBrowserChrome3> wbc3 = do_GetInterface(treeOwner);
NS_ENSURE_TRUE(wbc3, false);
nsCOMPtr<nsIURI> uri;
rv = aChannel->GetURI(getter_AddRefs(uri));
NS_ENSURE_SUCCESS(rv, false);
NS_ENSURE_TRUE(uri, false);
nsCOMPtr<nsIURI> referrer;
rv = aChannel->GetReferrer(getter_AddRefs(referrer));
NS_ENSURE_SUCCESS(rv, false);
nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
if (!loadInfo) {
return false;
}
nsCOMPtr<nsIPrincipal> triggeringPrincipal = loadInfo->TriggeringPrincipal();
// Get the channel's load flags, and use them to generate nsIWebNavigation
// load flags. We want to make sure to propagate the refresh and cache busting
// flags.
nsLoadFlags channelLoadFlags;
aChannel->GetLoadFlags(&channelLoadFlags);
uint32_t webnavLoadFlags = nsIWebNavigation::LOAD_FLAGS_NONE;
if (channelLoadFlags & nsIRequest::LOAD_BYPASS_CACHE) {
webnavLoadFlags |= nsIWebNavigation::LOAD_FLAGS_BYPASS_CACHE;
webnavLoadFlags |= nsIWebNavigation::LOAD_FLAGS_BYPASS_PROXY;
} else if (channelLoadFlags & nsIRequest::VALIDATE_ALWAYS) {
webnavLoadFlags |= nsIWebNavigation::LOAD_FLAGS_IS_REFRESH;
}
// Actually perform the cross process load
bool reloadSucceeded = false;
rv = wbc3->ReloadInFreshProcess(docShell, uri, referrer,
triggeringPrincipal, webnavLoadFlags,
&reloadSucceeded);
NS_ENSURE_SUCCESS(rv, false);
return reloadSucceeded;
}
/* static */ void
nsContentUtils::AppendDocumentLevelNativeAnonymousContentTo(
nsIDocument* aDocument,
nsTArray<nsIContent*>& aElements)
{
MOZ_ASSERT(aDocument);
#ifdef DEBUG
size_t oldLength = aElements.Length();
#endif
if (nsIPresShell* presShell = aDocument->GetShell()) {
if (nsIFrame* scrollFrame = presShell->GetRootScrollFrame()) {
nsIAnonymousContentCreator* creator = do_QueryFrame(scrollFrame);
MOZ_ASSERT(creator,
"scroll frame should always implement nsIAnonymousContentCreator");
creator->AppendAnonymousContentTo(aElements, 0);
}
if (nsCanvasFrame* canvasFrame = presShell->GetCanvasFrame()) {
if (Element* container = canvasFrame->GetCustomContentContainer()) {
aElements.AppendElement(container);
}
}
}
#ifdef DEBUG
for (size_t i = oldLength; i < aElements.Length(); i++) {
MOZ_ASSERT(
aElements[i]->GetProperty(nsGkAtoms::docLevelNativeAnonymousContent),
"Someone here has lied, or missed to flag the node");
}
#endif
}
static void
AppendNativeAnonymousChildrenFromFrame(
nsIFrame* aFrame,
nsTArray<nsIContent*>& aKids,
uint32_t aFlags)
{
if (nsIAnonymousContentCreator* ac = do_QueryFrame(aFrame)) {
ac->AppendAnonymousContentTo(aKids, aFlags);
}
}
/* static */ void
nsContentUtils::AppendNativeAnonymousChildren(
const nsIContent* aContent,
nsTArray<nsIContent*>& aKids,
uint32_t aFlags)
{
if (aContent->MayHaveAnonymousChildren()) {
if (nsIFrame* primaryFrame = aContent->GetPrimaryFrame()) {
// NAC created by the element's primary frame.
AppendNativeAnonymousChildrenFromFrame(primaryFrame, aKids, aFlags);
// NAC created by any other non-primary frames for the element.
AutoTArray<nsIFrame::OwnedAnonBox, 8> ownedAnonBoxes;
primaryFrame->AppendOwnedAnonBoxes(ownedAnonBoxes);
for (nsIFrame::OwnedAnonBox& box : ownedAnonBoxes) {
MOZ_ASSERT(box.mAnonBoxFrame->GetContent() == aContent);
AppendNativeAnonymousChildrenFromFrame(box.mAnonBoxFrame, aKids, aFlags);
}
}
// Get manually created NAC (editor resize handles, etc.).
if (auto nac = static_cast<ManualNACArray*>(
aContent->GetProperty(nsGkAtoms::manualNACProperty))) {
aKids.AppendElements(*nac);
}
}
// The root scroll frame is not the primary frame of the root element.
// Detect and handle this case.
if (!(aFlags & nsIContent::eSkipDocumentLevelNativeAnonymousContent) &&
aContent == aContent->OwnerDoc()->GetRootElement()) {
AppendDocumentLevelNativeAnonymousContentTo(aContent->OwnerDoc(), aKids);
}
}
/* static */ bool
nsContentUtils::QueryTriggeringPrincipal(nsIContent* aLoadingNode,
nsIPrincipal* aDefaultPrincipal,
nsIPrincipal** aTriggeringPrincipal)
{
MOZ_ASSERT(aLoadingNode);
MOZ_ASSERT(aTriggeringPrincipal);
bool result = false;
nsCOMPtr<nsIPrincipal> loadingPrincipal = aDefaultPrincipal;
if (!loadingPrincipal) {
loadingPrincipal = aLoadingNode->NodePrincipal();
}
// If aLoadingNode is content, bail out early.
if (!aLoadingNode->NodePrincipal()->GetIsSystemPrincipal()) {
loadingPrincipal.forget(aTriggeringPrincipal);
return result;
}
nsAutoString loadingStr;
if (aLoadingNode->IsElement()) {
aLoadingNode->AsElement()->GetAttr(kNameSpaceID_None,
nsGkAtoms::triggeringprincipal,
loadingStr);
}
// Fall back if 'triggeringprincipal' isn't specified,
if (loadingStr.IsEmpty()) {
loadingPrincipal.forget(aTriggeringPrincipal);
return result;
}
nsCOMPtr<nsISupports> serializedPrincipal;
NS_DeserializeObject(NS_ConvertUTF16toUTF8(loadingStr),
getter_AddRefs(serializedPrincipal));
nsCOMPtr<nsIPrincipal> serializedPrin = do_QueryInterface(serializedPrincipal);
if (serializedPrin) {
result = true;
serializedPrin.forget(aTriggeringPrincipal);
} else {
// Fallback if the deserialization is failed.
loadingPrincipal.forget(aTriggeringPrincipal);
}
return result;
}
/* static */ void
nsContentUtils::GetContentPolicyTypeForUIImageLoading(nsIContent* aLoadingNode,
nsIPrincipal** aTriggeringPrincipal,
nsContentPolicyType& aContentPolicyType,
uint64_t* aRequestContextID)
{
MOZ_ASSERT(aRequestContextID);
bool result = QueryTriggeringPrincipal(aLoadingNode, aTriggeringPrincipal);
if (result) {
// Set the content policy type to TYPE_INTERNAL_IMAGE_FAVICON for
// indicating it's a favicon loading.
aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON;
nsAutoString requestContextID;
if (aLoadingNode->IsElement()) {
aLoadingNode->AsElement()->GetAttr(kNameSpaceID_None,
nsGkAtoms::requestcontextid,
requestContextID);
}
nsresult rv;
int64_t val = requestContextID.ToInteger64(&rv);
*aRequestContextID = NS_SUCCEEDED(rv)
? val
: 0;
} else {
aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE;
}
}
/* static */ nsresult
nsContentUtils::CreateJSValueFromSequenceOfObject(JSContext* aCx,
const Sequence<JSObject*>& aTransfer,
JS::MutableHandle<JS::Value> aValue)
{
if (aTransfer.IsEmpty()) {
return NS_OK;
}
JS::Rooted<JSObject*> array(aCx, JS_NewArrayObject(aCx, aTransfer.Length()));
if (!array) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (uint32_t i = 0; i < aTransfer.Length(); ++i) {
JS::Rooted<JSObject*> object(aCx, aTransfer[i]);
if (!object) {
continue;
}
if (NS_WARN_IF(!JS_DefineElement(aCx, array, i, object,
JSPROP_ENUMERATE))) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
aValue.setObject(*array);
return NS_OK;
}
/* static */
bool
nsContentUtils::ShouldBlockReservedKeys(WidgetKeyboardEvent* aKeyEvent)
{
nsCOMPtr<nsIPrincipal> principal;
nsCOMPtr<nsIBrowser> targetBrowser = do_QueryInterface(aKeyEvent->mOriginalTarget);
bool isRemoteBrowser = false;
if (targetBrowser) {
targetBrowser->GetIsRemoteBrowser(&isRemoteBrowser);
}
if (isRemoteBrowser) {
targetBrowser->GetContentPrincipal(getter_AddRefs(principal));
}
else {
// Get the top-level document.
nsCOMPtr<nsIContent> content = do_QueryInterface(aKeyEvent->mOriginalTarget);
if (content) {
nsIDocument* doc = content->GetUncomposedDoc();
if (doc) {
nsCOMPtr<nsIDocShellTreeItem> docShell = doc->GetDocShell();
if (docShell && docShell->ItemType() == nsIDocShellTreeItem::typeContent) {
nsCOMPtr<nsIDocShellTreeItem> rootItem;
docShell->GetSameTypeRootTreeItem(getter_AddRefs(rootItem));
if (rootItem && rootItem->GetDocument()) {
principal = rootItem->GetDocument()->NodePrincipal();
}
}
}
}
}
if (principal) {
return nsContentUtils::IsSitePermDeny(principal, "shortcuts");
}
return false;
}
/**
* Checks whether the given type is a supported document type for
* loading within the nsObjectLoadingContent specified by aContent.
*
* NOTE Helper method for nsContentUtils::HtmlObjectContentTypeForMIMEType.
* NOTE Does not take content policy or capabilities into account
*/
static bool
HtmlObjectContentSupportsDocument(const nsCString& aMimeType,
nsIContent* aContent)
{
nsCOMPtr<nsIWebNavigationInfo> info(
do_GetService(NS_WEBNAVIGATION_INFO_CONTRACTID));
if (!info) {
return false;
}
nsCOMPtr<nsIWebNavigation> webNav;
if (aContent) {
nsIDocument* currentDoc = aContent->GetComposedDoc();
if (currentDoc) {
webNav = do_GetInterface(currentDoc->GetWindow());
}
}
uint32_t supported;
nsresult rv = info->IsTypeSupported(aMimeType, webNav, &supported);
if (NS_FAILED(rv)) {
return false;
}
if (supported != nsIWebNavigationInfo::UNSUPPORTED) {
// Don't want to support plugins as documents
return supported != nsIWebNavigationInfo::PLUGIN;
}
// Try a stream converter
// NOTE: We treat any type we can convert from as a supported type. If a
// type is not actually supported, the URI loader will detect that and
// return an error, and we'll fallback.
nsCOMPtr<nsIStreamConverterService> convServ =
do_GetService("@mozilla.org/streamConverters;1");
bool canConvert = false;
if (convServ) {
rv = convServ->CanConvert(aMimeType.get(), "*/*", &canConvert);
}
return NS_SUCCEEDED(rv) && canConvert;
}
/* static */
already_AddRefed<nsIPluginTag>
nsContentUtils::PluginTagForType(const nsCString& aMIMEType, bool aNoFakePlugin)
{
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
nsCOMPtr<nsIPluginTag> tag;
NS_ENSURE_TRUE(pluginHost, nullptr);
// ShouldPlay will handle the case where the plugin is disabled
pluginHost->GetPluginTagForType(aMIMEType,
aNoFakePlugin ? nsPluginHost::eExcludeFake
: nsPluginHost::eExcludeNone,
getter_AddRefs(tag));
return tag.forget();
}
/* static */ uint32_t
nsContentUtils::HtmlObjectContentTypeForMIMEType(const nsCString& aMIMEType,
bool aNoFakePlugin,
nsIContent* aContent)
{
if (aMIMEType.IsEmpty()) {
return nsIObjectLoadingContent::TYPE_NULL;
}
if (imgLoader::SupportImageWithMimeType(aMIMEType.get())) {
return nsIObjectLoadingContent::TYPE_IMAGE;
}
// Faking support of the PDF content as a document for EMBED tags
// when internal PDF viewer is enabled.
if (aMIMEType.LowerCaseEqualsLiteral("application/pdf") &&
IsPDFJSEnabled()) {
return nsIObjectLoadingContent::TYPE_DOCUMENT;
}
if (HtmlObjectContentSupportsDocument(aMIMEType, aContent)) {
return nsIObjectLoadingContent::TYPE_DOCUMENT;
}
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
if (pluginHost) {
nsCOMPtr<nsIPluginTag> tag = PluginTagForType(aMIMEType, aNoFakePlugin);
if (tag) {
if (!aNoFakePlugin &&
nsCOMPtr<nsIFakePluginTag>(do_QueryInterface(tag))) {
return nsIObjectLoadingContent::TYPE_FAKE_PLUGIN;
}
// ShouldPlay will handle checking for disabled plugins
return nsIObjectLoadingContent::TYPE_PLUGIN;
}
}
return nsIObjectLoadingContent::TYPE_NULL;
}
/* static */ already_AddRefed<nsISerialEventTarget>
nsContentUtils::GetEventTargetByLoadInfo(nsILoadInfo* aLoadInfo, TaskCategory aCategory)
{
if (NS_WARN_IF(!aLoadInfo)) {
return nullptr;
}
nsCOMPtr<nsIDocument> doc;
aLoadInfo->GetLoadingDocument(getter_AddRefs(doc));
nsCOMPtr<nsISerialEventTarget> target;
if (doc) {
if (DocGroup* group = doc->GetDocGroup()) {
target = group->EventTargetFor(aCategory);
}
} else {
// There's no document yet, but this might be a top-level load where we can
// find a TabGroup.
uint64_t outerWindowId;
if (NS_FAILED(aLoadInfo->GetOuterWindowID(&outerWindowId))) {
// No window. This might be an add-on XHR, a service worker request, or
// something else.
return nullptr;
}
RefPtr<nsGlobalWindowOuter> window =
nsGlobalWindowOuter::GetOuterWindowWithId(outerWindowId);
if (!window) {
return nullptr;
}
target = window->TabGroup()->EventTargetFor(aCategory);
}
return target.forget();
}
namespace {
template<class T>
bool IsLocalRefURL(const T& aString) {
// Find the first non-"C0 controls + space" character.
const typename T::char_type* current = aString.BeginReading();
for (; current != aString.EndReading(); current++) {
if (*current > 0x20) {
// if the first non-"C0 controls + space" character is '#', this is a
// local-ref URL.
return *current == '#';
}
}
return false;
}
}
/* static */ bool
nsContentUtils::IsLocalRefURL(const nsString& aString)
{
return ::IsLocalRefURL(aString);
}
/* static */ bool
nsContentUtils::IsLocalRefURL(const nsACString& aString)
{
return ::IsLocalRefURL(aString);
}
static const uint64_t kIdProcessBits = 32;
static const uint64_t kIdBits = 64 - kIdProcessBits;
/* static */ uint64_t
GenerateProcessSpecificId(uint64_t aId)
{
uint64_t processId = 0;
if (XRE_IsContentProcess()) {
ContentChild* cc = ContentChild::GetSingleton();
processId = cc->GetID();
}
MOZ_RELEASE_ASSERT(processId < (uint64_t(1) << kIdProcessBits));
uint64_t processBits = processId & ((uint64_t(1) << kIdProcessBits) - 1);
uint64_t id = aId;
MOZ_RELEASE_ASSERT(id < (uint64_t(1) << kIdBits));
uint64_t bits = id & ((uint64_t(1) << kIdBits) - 1);
return (processBits << kIdBits) | bits;
}
// Tab ID is composed in a similar manner of Window ID.
static uint64_t gNextTabId = 0;
/* static */ uint64_t
nsContentUtils::GenerateTabId()
{
return GenerateProcessSpecificId(++gNextTabId);
}
// Browsing context ID is composed in a similar manner of Window ID.
static uint64_t gNextBrowsingContextId = 0;
/* static */ uint64_t
nsContentUtils::GenerateBrowsingContextId()
{
return GenerateProcessSpecificId(++gNextBrowsingContextId);
}
/* static */ bool
nsContentUtils::GetUserIsInteracting()
{
return UserInteractionObserver::sUserActive;
}
/* static */ bool
nsContentUtils::GetSourceMapURL(nsIHttpChannel* aChannel, nsACString& aResult)
{
nsresult rv = aChannel->GetResponseHeader(NS_LITERAL_CSTRING("SourceMap"), aResult);
if (NS_FAILED(rv)) {
rv = aChannel->GetResponseHeader(NS_LITERAL_CSTRING("X-SourceMap"), aResult);
}
return NS_SUCCEEDED(rv);
}
/* static */ bool
nsContentUtils::IsMessageInputEvent(const IPC::Message& aMsg)
{
if ((aMsg.type() & mozilla::dom::PBrowser::PBrowserStart)
== mozilla::dom::PBrowser::PBrowserStart) {
switch (aMsg.type()) {
case mozilla::dom::PBrowser::Msg_RealMouseMoveEvent__ID:
case mozilla::dom::PBrowser::Msg_RealMouseButtonEvent__ID:
case mozilla::dom::PBrowser::Msg_RealKeyEvent__ID:
case mozilla::dom::PBrowser::Msg_MouseWheelEvent__ID:
case mozilla::dom::PBrowser::Msg_RealTouchEvent__ID:
case mozilla::dom::PBrowser::Msg_RealTouchMoveEvent__ID:
case mozilla::dom::PBrowser::Msg_RealDragEvent__ID:
case mozilla::dom::PBrowser::Msg_UpdateDimensions__ID:
case mozilla::dom::PBrowser::Msg_MouseEvent__ID:
case mozilla::dom::PBrowser::Msg_SetDocShellIsActive__ID:
return true;
}
}
return false;
}
static const char* kUserInteractionInactive = "user-interaction-inactive";
static const char* kUserInteractionActive = "user-interaction-active";
void
nsContentUtils::UserInteractionObserver::Init()
{
// Listen for the observer messages from EventStateManager which are telling
// us whether or not the user is interacting.
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
obs->AddObserver(this, kUserInteractionInactive, false);
obs->AddObserver(this, kUserInteractionActive, false);
// We can't register ourselves as an annotator yet, as the
// BackgroundHangMonitor hasn't started yet. It will have started by the
// time we have the chance to spin the event loop.
RefPtr<UserInteractionObserver> self = this;
NS_DispatchToMainThread(
NS_NewRunnableFunction("nsContentUtils::UserInteractionObserver::Init",
[=]() { BackgroundHangMonitor::RegisterAnnotator(*self); }));
}
void
nsContentUtils::UserInteractionObserver::Shutdown()
{
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, kUserInteractionInactive);
obs->RemoveObserver(this, kUserInteractionActive);
}
BackgroundHangMonitor::UnregisterAnnotator(*this);
}
/**
* NB: This function is always called by the BackgroundHangMonitor thread.
* Plan accordingly
*/
void
nsContentUtils::UserInteractionObserver::AnnotateHang(BackgroundHangAnnotations& aAnnotations)
{
// NOTE: Only annotate the hang report if the user is known to be interacting.
if (sUserActive) {
aAnnotations.AddAnnotation(NS_LITERAL_STRING("UserInteracting"), true);
}
}
NS_IMETHODIMP
nsContentUtils::UserInteractionObserver::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (!strcmp(aTopic, kUserInteractionInactive)) {
sUserActive = false;
} else if (!strcmp(aTopic, kUserInteractionActive)) {
sUserActive = true;
} else {
NS_WARNING("Unexpected observer notification");
}
return NS_OK;
}
Atomic<bool> nsContentUtils::UserInteractionObserver::sUserActive(false);
NS_IMPL_ISUPPORTS(nsContentUtils::UserInteractionObserver, nsIObserver)
/* static */ bool
nsContentUtils::IsOverridingWindowName(const nsAString& aName)
{
return !aName.IsEmpty() &&
!aName.LowerCaseEqualsLiteral("_blank") &&
!aName.LowerCaseEqualsLiteral("_top") &&
!aName.LowerCaseEqualsLiteral("_parent") &&
!aName.LowerCaseEqualsLiteral("_self");
}
// Unfortunately, we can't unwrap an IDL object using only a concrete type.
// We need to calculate type data based on the IDL typename. Which means
// wrapping our templated function in a macro.
#define EXTRACT_EXN_VALUES(T, ...) \
ExtractExceptionValues<mozilla::dom::prototypes::id::T, \
T##_Binding::NativeType, T>(__VA_ARGS__).isOk()
template <prototypes::ID PrototypeID, class NativeType, typename T>
static Result<Ok, nsresult>
ExtractExceptionValues(JSContext* aCx,
JS::HandleObject aObj,
nsAString& aSourceSpecOut,
uint32_t* aLineOut,
uint32_t* aColumnOut,
nsString& aMessageOut)
{
RefPtr<T> exn;
MOZ_TRY((UnwrapObject<PrototypeID, NativeType>(aObj, exn)));
exn->GetFilename(aCx, aSourceSpecOut);
if (!aSourceSpecOut.IsEmpty()) {
*aLineOut = exn->LineNumber(aCx);
*aColumnOut = exn->ColumnNumber();
}
exn->GetName(aMessageOut);
aMessageOut.AppendLiteral(": ");
nsAutoString message;
exn->GetMessageMoz(message);
aMessageOut.Append(message);
return Ok();
}
/* static */ void
nsContentUtils::ExtractErrorValues(JSContext* aCx,
JS::Handle<JS::Value> aValue,
nsACString& aSourceSpecOut,
uint32_t* aLineOut,
uint32_t* aColumnOut,
nsString& aMessageOut)
{
nsAutoString sourceSpec;
ExtractErrorValues(aCx, aValue, sourceSpec, aLineOut, aColumnOut, aMessageOut);
CopyUTF16toUTF8(sourceSpec, aSourceSpecOut);
}
/* static */ void
nsContentUtils::ExtractErrorValues(JSContext* aCx,
JS::Handle<JS::Value> aValue,
nsAString& aSourceSpecOut,
uint32_t* aLineOut,
uint32_t* aColumnOut,
nsString& aMessageOut)
{
MOZ_ASSERT(aLineOut);
MOZ_ASSERT(aColumnOut);
if (aValue.isObject()) {
JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
// Try to process as an Error object. Use the file/line/column values
// from the Error as they will be more specific to the root cause of
// the problem.
JSErrorReport* err = obj ? JS_ErrorFromException(aCx, obj) : nullptr;
if (err) {
// Use xpc to extract the error message only. We don't actually send
// this report anywhere.
RefPtr<xpc::ErrorReport> report = new xpc::ErrorReport();
report->Init(err,
"<unknown>", // toString result
false, // chrome
0); // window ID
if (!report->mFileName.IsEmpty()) {
aSourceSpecOut = report->mFileName;
*aLineOut = report->mLineNumber;
*aColumnOut = report->mColumn;
}
aMessageOut.Assign(report->mErrorMsg);
}
// Next, try to unwrap the rejection value as a DOMException.
else if (EXTRACT_EXN_VALUES(DOMException, aCx, obj, aSourceSpecOut,
aLineOut, aColumnOut, aMessageOut)) {
return;
}
// Next, try to unwrap the rejection value as an XPC Exception.
else if (EXTRACT_EXN_VALUES(Exception, aCx, obj, aSourceSpecOut,
aLineOut, aColumnOut, aMessageOut)) {
return;
}
}
// If we could not unwrap a specific error type, then perform default safe
// string conversions on primitives. Objects will result in "[Object]"
// unfortunately.
if (aMessageOut.IsEmpty()) {
nsAutoJSString jsString;
if (jsString.init(aCx, aValue)) {
aMessageOut = jsString;
} else {
JS_ClearPendingException(aCx);
}
}
}
#undef EXTRACT_EXN_VALUES
/* static */ bool
nsContentUtils::ContentIsLink(nsIContent* aContent)
{
if (!aContent || !aContent->IsElement()) {
return false;
}
if (aContent->IsHTMLElement(nsGkAtoms::a)) {
return true;
}
return aContent->AsElement()->AttrValueIs(
kNameSpaceID_XLink, nsGkAtoms::type, nsGkAtoms::simple, eCaseMatters);
}
/* static */ already_AddRefed<ContentFrameMessageManager>
nsContentUtils::TryGetTabChildGlobal(nsISupports* aFrom)
{
nsCOMPtr<nsIFrameLoaderOwner> frameLoaderOwner = do_QueryInterface(aFrom);
if (!frameLoaderOwner) {
return nullptr;
}
RefPtr<nsFrameLoader> frameLoader = frameLoaderOwner->GetFrameLoader();
if (!frameLoader) {
return nullptr;
}
RefPtr<ContentFrameMessageManager> manager = frameLoader->GetTabChildMessageManager();
return manager.forget();
}
/* static */ uint32_t
nsContentUtils::InnerOrOuterWindowCreated()
{
MOZ_ASSERT(NS_IsMainThread());
++sInnerOrOuterWindowCount;
return ++sInnerOrOuterWindowSerialCounter;
}
/* static */ void
nsContentUtils::InnerOrOuterWindowDestroyed()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sInnerOrOuterWindowCount > 0);
--sInnerOrOuterWindowCount;
}
/* static */ bool
nsContentUtils::CanShowPopup(nsIPrincipal* aPrincipal)
{
MOZ_ASSERT(aPrincipal);
uint32_t permit;
nsCOMPtr<nsIPermissionManager> permissionManager =
services::GetPermissionManager();
if (permissionManager &&
NS_SUCCEEDED(permissionManager->TestPermissionFromPrincipal(aPrincipal, "popup", &permit))) {
if (permit == nsIPermissionManager::ALLOW_ACTION) {
return true;
}
if (permit == nsIPermissionManager::DENY_ACTION) {
return false;
}
}
return !sDisablePopups;
}
static bool
JSONCreator(const char16_t* aBuf, uint32_t aLen, void* aData)
{
nsAString* result = static_cast<nsAString*>(aData);
result->Append(static_cast<const char16_t*>(aBuf),
static_cast<uint32_t>(aLen));
return true;
}
/* static */ bool
nsContentUtils::StringifyJSON(JSContext* aCx, JS::MutableHandle<JS::Value> aValue, nsAString& aOutStr)
{
MOZ_ASSERT(aCx);
aOutStr.Truncate();
JS::RootedValue value(aCx, aValue.get());
nsAutoString serializedValue;
NS_ENSURE_TRUE(JS_Stringify(aCx, &value, nullptr, JS::NullHandleValue,
JSONCreator, &serializedValue), false);
aOutStr = serializedValue;
return true;
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку