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gecko-dev/dom/base/nsContentUtils.h

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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 content utilities. */
#ifndef nsContentUtils_h___
#define nsContentUtils_h___
#if defined(XP_WIN)
#include <float.h>
#endif
#if defined(SOLARIS)
#include <ieeefp.h>
#endif
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "js/RootingAPI.h"
#include "mozilla/EventForwards.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/TimeStamp.h"
#include "nsContentListDeclarations.h"
#include "nsMathUtils.h"
#include "nsTArrayForwardDeclare.h"
#include "Units.h"
#include "mozilla/dom/AutocompleteInfoBinding.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/net/ReferrerPolicy.h"
#include "nsIContentPolicy.h"
#if defined(XP_WIN)
// Undefine LoadImage to prevent naming conflict with Windows.
#undef LoadImage
#endif
class imgICache;
class imgIContainer;
class imgINotificationObserver;
class imgIRequest;
class imgLoader;
class imgRequestProxy;
class nsAutoScriptBlockerSuppressNodeRemoved;
class nsHtml5StringParser;
class nsIChannel;
class nsIConsoleService;
class nsIContent;
class nsIContentPolicy;
class nsIContentSecurityPolicy;
class nsIDocShellTreeItem;
class nsIDocument;
class nsIDocumentLoaderFactory;
class nsIDOMDocument;
class nsIDOMDocumentFragment;
class nsIDOMEvent;
class nsIDOMHTMLInputElement;
class nsIDOMKeyEvent;
class nsIDOMNode;
class nsIDOMWindow;
class nsIDragSession;
class nsIEditor;
class nsIFragmentContentSink;
class nsIFrame;
class nsIImageLoadingContent;
class nsIInterfaceRequestor;
class nsIIOService;
class nsILineBreaker;
class nsILoadGroup;
class nsIMessageBroadcaster;
class nsNameSpaceManager;
class nsIObserver;
class nsIParser;
class nsIParserService;
class nsIPresShell;
class nsIPrincipal;
class nsIRequest;
class nsIRunnable;
class nsIScriptContext;
class nsIScriptSecurityManager;
class nsIStringBundle;
class nsIStringBundleService;
class nsISupportsArray;
class nsISupportsHashKey;
class nsIURI;
class nsIUUIDGenerator;
class nsIWidget;
class nsIWordBreaker;
class nsIXPConnect;
class nsNodeInfoManager;
class nsPIDOMWindow;
class nsPresContext;
class nsStringBuffer;
class nsStringHashKey;
class nsTextFragment;
class nsView;
class nsViewportInfo;
class nsWrapperCache;
class nsAttrValue;
class nsITransferable;
class nsPIWindowRoot;
struct JSPropertyDescriptor;
struct JSRuntime;
struct nsIntMargin;
template<class E> class nsCOMArray;
template<class K, class V> class nsDataHashtable;
template<class K, class V> class nsRefPtrHashtable;
template<class T> class nsReadingIterator;
namespace mozilla {
class ErrorResult;
class EventListenerManager;
namespace dom {
class DocumentFragment;
class Element;
class EventTarget;
class IPCDataTransfer;
class NodeInfo;
class nsIContentChild;
class nsIContentParent;
class Selection;
class TabParent;
} // namespace dom
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace layers {
class LayerManager;
} // namespace layers
} // namespace mozilla
class nsIBidiKeyboard;
extern const char kLoadAsData[];
// Stolen from nsReadableUtils, but that's OK, since we can declare the same
// name multiple times.
const nsAFlatString& EmptyString();
const nsAFlatCString& EmptyCString();
enum EventNameType {
EventNameType_None = 0x0000,
EventNameType_HTML = 0x0001,
EventNameType_XUL = 0x0002,
EventNameType_SVGGraphic = 0x0004, // svg graphic elements
EventNameType_SVGSVG = 0x0008, // the svg element
EventNameType_SMIL = 0x0010, // smil elements
EventNameType_HTMLBodyOrFramesetOnly = 0x0020,
EventNameType_HTMLXUL = 0x0003,
EventNameType_All = 0xFFFF
};
struct EventNameMapping
{
// This holds pointers to nsGkAtoms members, and is therefore safe as a
// non-owning reference.
nsIAtom* MOZ_NON_OWNING_REF mAtom;
int32_t mType;
mozilla::EventMessage mMessage;
mozilla::EventClassID mEventClassID;
};
struct nsShortcutCandidate {
nsShortcutCandidate(uint32_t aCharCode, bool aIgnoreShift) :
mCharCode(aCharCode), mIgnoreShift(aIgnoreShift)
{
}
uint32_t mCharCode;
bool mIgnoreShift;
};
typedef void (*CallOnRemoteChildFunction) (mozilla::dom::TabParent* aTabParent,
void* aArg);
class nsContentUtils
{
friend class nsAutoScriptBlockerSuppressNodeRemoved;
typedef mozilla::dom::Element Element;
typedef mozilla::TimeDuration TimeDuration;
public:
static nsresult Init();
static bool IsCallerChrome();
static bool ThreadsafeIsCallerChrome();
static bool IsCallerContentXBL();
// In the traditional Gecko architecture, both C++ code and untrusted JS code
// needed to rely on the same XPCOM method/getter/setter to get work done.
// This required lots of security checks in the various exposed methods, which
// in turn created difficulty in determining whether the caller was script
// (whose access needed to be checked) and internal C++ platform code (whose
// access did not need to be checked). To address this problem, Gecko had a
// convention whereby the absence of script on the stack was interpretted as
// "System Caller" and always granted unfettered access.
//
// Unfortunately, this created a bunch of footguns. For example, when the
// implementation of a DOM method wanted to perform a privileged
// sub-operation, it needed to "hide" the presence of script on the stack in
// order for that sub-operation to be allowed. Additionally, if script could
// trigger an API entry point to be invoked in some asynchronous way without
// script on the stack, it could potentially perform privilege escalation.
//
// In the modern world, untrusted script should interact with the platform
// exclusively over WebIDL APIs, and platform code has a lot more flexibility
// in deciding whether or not to use XPCOM. This gives us the flexibility to
// do something better.
//
// Going forward, APIs should be designed such that any security checks that
// ask the question "is my caller allowed to do this?" should live in WebIDL
// API entry points, with a separate method provided for internal callers
// that just want to get the job done.
//
// To enforce this and catch bugs, nsContentUtils::SubjectPrincipal will crash
// if it is invoked without script on the stack. To land that transition, it
// was necessary to go through and whitelist a bunch of callers that were
// depending on the old behavior. Those callers should be fixed up, and these
// methods should not be used by new code without review from bholley or bz.
static bool LegacyIsCallerNativeCode() { return !GetCurrentJSContext(); }
static bool LegacyIsCallerChromeOrNativeCode() { return LegacyIsCallerNativeCode() || IsCallerChrome(); }
static nsIPrincipal* SubjectPrincipalOrSystemIfNativeCaller()
{
if (!GetCurrentJSContext()) {
return GetSystemPrincipal();
}
return SubjectPrincipal();
}
static bool IsImageSrcSetDisabled();
static bool LookupBindingMember(JSContext* aCx, nsIContent *aContent,
JS::Handle<jsid> aId,
JS::MutableHandle<JSPropertyDescriptor> aDesc);
// Check whether we should avoid leaking distinguishing information to JS/CSS.
static bool ShouldResistFingerprinting(nsIDocShell* aDocShell);
/**
* Returns the parent node of aChild crossing document boundaries.
* Uses the parent node in the composed document.
*/
static nsINode* GetCrossDocParentNode(nsINode* aChild);
/**
* Do not ever pass null pointers to this method. If one of your
* nsIContents is null, you have to decide for yourself what
* "IsDescendantOf" really means.
*
* @param aPossibleDescendant node to test for being a descendant of
* aPossibleAncestor
* @param aPossibleAncestor node to test for being an ancestor of
* aPossibleDescendant
* @return true if aPossibleDescendant is a descendant of
* aPossibleAncestor (or is aPossibleAncestor). false
* otherwise.
*/
static bool ContentIsDescendantOf(const nsINode* aPossibleDescendant,
const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf, except will treat an HTMLTemplateElement
* or ShadowRoot as an ancestor of things in the corresponding DocumentFragment.
* See the concept of "host-including inclusive ancestor" in the DOM
* specification.
*/
static bool ContentIsHostIncludingDescendantOf(
const nsINode* aPossibleDescendant, const nsINode* aPossibleAncestor);
/**
* Similar to ContentIsDescendantOf except it crosses document boundaries,
* this function uses ancestor/descendant relations in the composed document
* (see shadow DOM spec).
*/
static bool ContentIsCrossDocDescendantOf(nsINode* aPossibleDescendant,
nsINode* aPossibleAncestor);
/*
* This method fills the |aArray| with all ancestor nodes of |aNode|
* including |aNode| at the zero index.
*/
static nsresult GetAncestors(nsINode* aNode,
nsTArray<nsINode*>& aArray);
/*
* This method fills |aAncestorNodes| with all ancestor nodes of |aNode|
* including |aNode| (QI'd to nsIContent) at the zero index.
* For each ancestor, there is a corresponding element in |aAncestorOffsets|
* which is the IndexOf the child in relation to its parent.
*
* This method just sucks.
*/
static nsresult GetAncestorsAndOffsets(nsIDOMNode* aNode,
int32_t aOffset,
nsTArray<nsIContent*>* aAncestorNodes,
nsTArray<int32_t>* aAncestorOffsets);
/*
* The out parameter, |aCommonAncestor| will be the closest node, if any,
* to both |aNode| and |aOther| which is also an ancestor of each.
* Returns an error if the two nodes are disconnected and don't have
* a common ancestor.
*/
static nsresult GetCommonAncestor(nsIDOMNode *aNode,
nsIDOMNode *aOther,
nsIDOMNode** aCommonAncestor);
/**
* Returns the common ancestor, if any, for two nodes. Returns null if the
* nodes are disconnected.
*/
static nsINode* GetCommonAncestor(nsINode* aNode1,
nsINode* aNode2);
/**
* Returns true if aNode1 is before aNode2 in the same connected
* tree.
*/
static bool PositionIsBefore(nsINode* aNode1, nsINode* aNode2);
/**
* Utility routine to compare two "points", where a point is a
* node/offset pair
* Returns -1 if point1 < point2, 1, if point1 > point2,
* 0 if error or if point1 == point2.
* NOTE! If the two nodes aren't in the same connected subtree,
* the result is 1, and the optional aDisconnected parameter
* is set to true.
*/
static int32_t ComparePoints(nsINode* aParent1, int32_t aOffset1,
nsINode* aParent2, int32_t aOffset2,
bool* aDisconnected = nullptr);
static int32_t ComparePoints(nsIDOMNode* aParent1, int32_t aOffset1,
nsIDOMNode* aParent2, int32_t aOffset2,
bool* aDisconnected = nullptr);
/**
* Brute-force search of the element subtree rooted at aContent for
* an element with the given id. aId must be nonempty, otherwise
* this method may return nodes even if they have no id!
*/
static Element* MatchElementId(nsIContent *aContent, const nsAString& aId);
/**
* Similar to above, but to be used if one already has an atom for the ID
*/
static Element* MatchElementId(nsIContent *aContent, const nsIAtom* aId);
/**
* Reverses the document position flags passed in.
*
* @param aDocumentPosition The document position flags to be reversed.
*
* @return The reversed document position flags.
*
* @see nsIDOMNode
*/
static uint16_t ReverseDocumentPosition(uint16_t aDocumentPosition);
/**
* Returns a subdocument for aDocument with a particular outer window ID.
*
* @param aDocument
* The document whose subdocuments will be searched.
* @param aOuterWindowID
* The outer window ID for the subdocument to be found. This must
* be a value greater than 0.
* @return nsIDocument*
* A pointer to the found nsIDocument. nullptr if the subdocument
* cannot be found, or if either aDocument or aOuterWindowId were
* invalid. If the outer window ID belongs to aDocument itself, this
* will return a pointer to aDocument.
*/
static nsIDocument* GetSubdocumentWithOuterWindowId(nsIDocument *aDocument,
uint64_t aOuterWindowId);
static uint32_t CopyNewlineNormalizedUnicodeTo(const nsAString& aSource,
uint32_t aSrcOffset,
char16_t* aDest,
uint32_t aLength,
bool& aLastCharCR);
static uint32_t CopyNewlineNormalizedUnicodeTo(nsReadingIterator<char16_t>& aSrcStart, const nsReadingIterator<char16_t>& aSrcEnd, nsAString& aDest);
static const nsDependentSubstring TrimCharsInSet(const char* aSet,
const nsAString& aValue);
template<bool IsWhitespace(char16_t)>
static const nsDependentSubstring TrimWhitespace(const nsAString& aStr,
bool aTrimTrailing = true);
/**
* Returns true if aChar is of class Ps, Pi, Po, Pf, or Pe.
*/
static bool IsFirstLetterPunctuation(uint32_t aChar);
static bool IsFirstLetterPunctuationAt(const nsTextFragment* aFrag, uint32_t aOffset);
/**
* Returns true if aChar is of class Lu, Ll, Lt, Lm, Lo, Nd, Nl or No
*/
static bool IsAlphanumeric(uint32_t aChar);
static bool IsAlphanumericAt(const nsTextFragment* aFrag, uint32_t aOffset);
/*
* Is the character an HTML whitespace character?
*
* We define whitespace using the list in HTML5 and css3-selectors:
* U+0009, U+000A, U+000C, U+000D, U+0020
*
* HTML 4.01 also lists U+200B (zero-width space).
*/
static bool IsHTMLWhitespace(char16_t aChar);
/*
* Returns whether the character is an HTML whitespace (see IsHTMLWhitespace)
* or a nbsp character (U+00A0).
*/
static bool IsHTMLWhitespaceOrNBSP(char16_t aChar);
/**
* Is the HTML local name a block element?
*/
static bool IsHTMLBlock(nsIContent* aContent);
enum ParseHTMLIntegerResultFlags {
eParseHTMLInteger_NoFlags = 0,
eParseHTMLInteger_IsPercent = 1 << 0,
// eParseHTMLInteger_NonStandard is set if the string representation of the
// integer was not the canonical one (e.g. had extra leading '+' or '0').
eParseHTMLInteger_NonStandard = 1 << 1,
eParseHTMLInteger_DidNotConsumeAllInput = 1 << 2,
// Set if one or more error flags were set.
eParseHTMLInteger_Error = 1 << 3,
eParseHTMLInteger_ErrorNoValue = 1 << 4,
eParseHTMLInteger_ErrorOverflow = 1 << 5
};
static int32_t ParseHTMLInteger(const nsAString& aValue,
ParseHTMLIntegerResultFlags *aResult);
/**
* Parse a margin string of format 'top, right, bottom, left' into
* an nsIntMargin.
*
* @param aString the string to parse
* @param aResult the resulting integer
* @return whether the value could be parsed
*/
static bool ParseIntMarginValue(const nsAString& aString, nsIntMargin& aResult);
/**
* Parse the value of the <font size=""> attribute according to the HTML5
* spec as of April 16, 2012.
*
* @param aValue the value to parse
* @return 1 to 7, or 0 if the value couldn't be parsed
*/
static int32_t ParseLegacyFontSize(const nsAString& aValue);
static void Shutdown();
/**
* Checks whether two nodes come from the same origin.
*/
static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
nsIDOMNode* aUnTrustedNode);
static nsresult CheckSameOrigin(const nsINode* aTrustedNode,
const nsINode* unTrustedNode);
// Check if the (JS) caller can access aNode.
static bool CanCallerAccess(nsIDOMNode *aNode);
static bool CanCallerAccess(nsINode* aNode);
// Check if the (JS) caller can access aWindow.
// aWindow can be either outer or inner window.
static bool CanCallerAccess(nsPIDOMWindow* aWindow);
/**
* GetDocumentFromCaller gets its document by looking at the last called
* function and finding the document that the function itself relates to.
* For example, consider two windows A and B in the same origin. B has a
* function which does something that ends up needing the current document.
* If a script in window A were to call B's function, GetDocumentFromCaller
* would find that function (in B) and return B's document.
*
* @return The document or null if no JS Context.
*/
static nsIDocument* GetDocumentFromCaller();
// Check if a node is in the document prolog, i.e. before the document
// element.
static bool InProlog(nsINode *aNode);
static nsIParserService* GetParserService();
static nsNameSpaceManager* NameSpaceManager()
{
return sNameSpaceManager;
}
static nsIIOService* GetIOService()
{
return sIOService;
}
static nsIBidiKeyboard* GetBidiKeyboard();
/**
* Get the cache security manager service. Can return null if the layout
* module has been shut down.
*/
static nsIScriptSecurityManager* GetSecurityManager()
{
return sSecurityManager;
}
/**
* Get the ContentSecurityPolicy for a JS context.
**/
static bool GetContentSecurityPolicy(nsIContentSecurityPolicy** aCSP);
// Returns the subject principal. Guaranteed to return non-null. May only
// be called when nsContentUtils is initialized.
static nsIPrincipal* SubjectPrincipal();
// Returns the prinipal of the given JS object. This may only be called on
// the main thread for objects from the main thread's JSRuntime.
static nsIPrincipal* ObjectPrincipal(JSObject* aObj);
static nsresult GenerateStateKey(nsIContent* aContent,
const nsIDocument* aDocument,
nsACString& aKey);
/**
* Create a new nsIURI from aSpec, using aBaseURI as the base. The
* origin charset of the new nsIURI will be the document charset of
* aDocument.
*/
static nsresult NewURIWithDocumentCharset(nsIURI** aResult,
const nsAString& aSpec,
nsIDocument* aDocument,
nsIURI* aBaseURI);
/**
* Convert aInput (in encoding aEncoding) to UTF16 in aOutput.
*
* @param aEncoding the Gecko-canonical name of the encoding or the empty
* string (meaning UTF-8)
*/
static nsresult ConvertStringFromEncoding(const nsACString& aEncoding,
const nsACString& aInput,
nsAString& aOutput);
/**
* Determine whether a buffer begins with a BOM for UTF-8, UTF-16LE,
* UTF-16BE
*
* @param aBuffer the buffer to check
* @param aLength the length of the buffer
* @param aCharset empty if not found
* @return boolean indicating whether a BOM was detected.
*/
static bool CheckForBOM(const unsigned char* aBuffer, uint32_t aLength,
nsACString& aCharset);
/**
* Returns true if |aName| is a valid name to be registered via
* document.registerElement.
*/
static bool IsCustomElementName(nsIAtom* aName);
static nsresult CheckQName(const nsAString& aQualifiedName,
bool aNamespaceAware = true,
const char16_t** aColon = nullptr);
static nsresult SplitQName(const nsIContent* aNamespaceResolver,
const nsAFlatString& aQName,
int32_t *aNamespace, nsIAtom **aLocalName);
static nsresult GetNodeInfoFromQName(const nsAString& aNamespaceURI,
const nsAString& aQualifiedName,
nsNodeInfoManager* aNodeInfoManager,
uint16_t aNodeType,
mozilla::dom::NodeInfo** aNodeInfo);
static void SplitExpatName(const char16_t *aExpatName, nsIAtom **aPrefix,
nsIAtom **aTagName, int32_t *aNameSpaceID);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
static bool IsSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
static bool IsSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't ALLOW_ACTION, false is
// returned, otherwise true is returned. Always returns true for the
// system principal, and false for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermAllow(nsIPrincipal* aPrincipal, const char* aType);
// Get a permission-manager setting for the given principal and type.
// If the pref doesn't exist or if it isn't DENY_ACTION, false is
// returned, otherwise true is returned. Always returns false for the
// system principal, and true for a null principal.
// This version checks the permission for an exact host match on
// the principal
static bool IsExactSitePermDeny(nsIPrincipal* aPrincipal, const char* aType);
// Returns true if aDoc1 and aDoc2 have equal NodePrincipal()s.
static bool HaveEqualPrincipals(nsIDocument* aDoc1, nsIDocument* aDoc2);
static nsILineBreaker* LineBreaker()
{
return sLineBreaker;
}
static nsIWordBreaker* WordBreaker()
{
return sWordBreaker;
}
/**
* Regster aObserver as a shutdown observer. A strong reference is held
* to aObserver until UnregisterShutdownObserver is called.
*/
static void RegisterShutdownObserver(nsIObserver* aObserver);
static void UnregisterShutdownObserver(nsIObserver* aObserver);
/**
* @return true if aContent has an attribute aName in namespace aNameSpaceID,
* and the attribute value is non-empty.
*/
static bool HasNonEmptyAttr(const nsIContent* aContent, int32_t aNameSpaceID,
nsIAtom* aName);
/**
* Method that gets the primary presContext for the node.
*
* @param aContent The content node.
* @return the presContext, or nullptr if the content is not in a document
* (if GetCurrentDoc returns nullptr)
*/
static nsPresContext* GetContextForContent(const nsIContent* aContent);
/**
* Method to do security and content policy checks on the image URI
*
* @param aURI uri of the image to be loaded
* @param aContext the context the image is loaded in (eg an element)
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
* The CP content type to use
* @param aImageBlockingStatus the nsIContentPolicy blocking status for this
* image. This will be set even if a security check fails for the
* image, to some reasonable REJECT_* value. This out param will only
* be set if it's non-null.
* @return true if the load can proceed, or false if it is blocked.
* Note that aImageBlockingStatus, if set will always be an ACCEPT
* status if true is returned and always be a REJECT_* status if
* false is returned.
*/
static bool CanLoadImage(nsIURI* aURI,
nsISupports* aContext,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
int16_t* aImageBlockingStatus = nullptr,
uint32_t aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE);
/**
* Returns true if objects in aDocument shouldn't initiate image loads.
*/
static bool DocumentInactiveForImageLoads(nsIDocument* aDocument);
/**
* Method to start an image load. This does not do any security checks.
* This method will attempt to make aURI immutable; a caller that wants to
* keep a mutable version around should pass in a clone.
*
* @param aURI uri of the image to be loaded
* @param aLoadingDocument the document we belong to
* @param aLoadingPrincipal the principal doing the load
* @param aReferrer the referrer URI
* @param aReferrerPolicy the referrer-sending policy to use on channel
* creation
* @param aObserver the observer for the image load
* @param aLoadFlags the load flags to use. See nsIRequest
* @param [aContentPolicyType=nsIContentPolicy::TYPE_INTERNAL_IMAGE] (Optional)
* The CP content type to use
* @return the imgIRequest for the image load
*/
static nsresult LoadImage(nsIURI* aURI,
nsIDocument* aLoadingDocument,
nsIPrincipal* aLoadingPrincipal,
nsIURI* aReferrer,
mozilla::net::ReferrerPolicy aReferrerPolicy,
imgINotificationObserver* aObserver,
int32_t aLoadFlags,
const nsAString& initiatorType,
imgRequestProxy** aRequest,
uint32_t aContentPolicyType = nsIContentPolicy::TYPE_INTERNAL_IMAGE);
/**
* Obtain an image loader that respects the given document/channel's privacy status.
* Null document/channel arguments return the public image loader.
*/
static imgLoader* GetImgLoaderForDocument(nsIDocument* aDoc);
static imgLoader* GetImgLoaderForChannel(nsIChannel* aChannel,
nsIDocument* aContext);
/**
* Returns whether the given URI is in the image cache.
*/
static bool IsImageInCache(nsIURI* aURI, nsIDocument* aDocument);
/**
* Method to get an imgIContainer from an image loading content
*
* @param aContent The image loading content. Must not be null.
* @param aRequest The image request [out]
* @return the imgIContainer corresponding to the first frame of the image
*/
static already_AddRefed<imgIContainer> GetImageFromContent(nsIImageLoadingContent* aContent, imgIRequest **aRequest = nullptr);
/**
* Helper method to call imgIRequest::GetStaticRequest.
*/
static already_AddRefed<imgRequestProxy> GetStaticRequest(imgRequestProxy* aRequest);
/**
* Method that decides whether a content node is draggable
*
* @param aContent The content node to test.
* @return whether it's draggable
*/
static bool ContentIsDraggable(nsIContent* aContent);
/**
* Method that decides whether a content node is a draggable image
*
* @param aContent The content node to test.
* @return whether it's a draggable image
*/
static bool IsDraggableImage(nsIContent* aContent);
/**
* Method that decides whether a content node is a draggable link
*
* @param aContent The content node to test.
* @return whether it's a draggable link
*/
static bool IsDraggableLink(const nsIContent* aContent);
/**
* Convenience method to create a new nodeinfo that differs only by name
* from aNodeInfo.
*/
static nsresult NameChanged(mozilla::dom::NodeInfo* aNodeInfo, nsIAtom* aName,
mozilla::dom::NodeInfo** aResult);
/**
* Returns the appropriate event argument names for the specified
* namespace and event name. Added because we need to switch between
* SVG's "evt" and the rest of the world's "event", and because onerror
* on window takes 5 args.
*/
static void GetEventArgNames(int32_t aNameSpaceID, nsIAtom *aEventName,
bool aIsForWindow,
uint32_t *aArgCount, const char*** aArgNames);
/**
* Returns true if this document is in a Private Browsing window.
*/
static bool IsInPrivateBrowsing(nsIDocument* aDoc);
/**
* Returns true if this loadGroup uses Private Browsing.
*/
static bool IsInPrivateBrowsing(nsILoadGroup* aLoadGroup);
/**
* If aNode is not an element, return true exactly when aContent's binding
* parent is null.
*
* If aNode is an element, return true exactly when aContent's binding parent
* is the same as aNode's.
*
* This method is particularly useful for callers who are trying to ensure
* that they are working with a non-anonymous descendant of a given node. If
* aContent is a descendant of aNode, a return value of false from this
* method means that it's an anonymous descendant from aNode's point of view.
*
* Both arguments to this method must be non-null.
*/
static bool IsInSameAnonymousTree(const nsINode* aNode, const nsIContent* aContent);
/**
* Return the nsIXPConnect service.
*/
static nsIXPConnect *XPConnect()
{
return sXPConnect;
}
/**
* Report simple error message to the browser console
* @param aErrorText the error message
* @param classification Name of the module reporting error
*/
static void LogSimpleConsoleError(const nsAString& aErrorText,
const char * classification);
/**
* Report a non-localized error message to the error console.
* @param aErrorText the error message
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
*/
static nsresult ReportToConsoleNonLocalized(const nsAString& aErrorText,
uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
nsIURI* aURI = nullptr,
const nsAFlatString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0);
/**
* Report a localized error message to the error console.
* @param aErrorFlags See nsIScriptError.
* @param aCategory Name of module reporting error.
* @param aDocument Reference to the document which triggered the message.
* @param aFile Properties file containing localized message.
* @param aMessageName Name of localized message.
* @param [aParams=nullptr] (Optional) Parameters to be substituted into
localized message.
* @param [aParamsLength=0] (Optional) Length of aParams.
* @param [aURI=nullptr] (Optional) URI of resource containing error.
* @param [aSourceLine=EmptyString()] (Optional) The text of the line that
contains the error (may be empty).
* @param [aLineNumber=0] (Optional) Line number within resource
containing error.
* @param [aColumnNumber=0] (Optional) Column number within resource
containing error.
If aURI is null, then aDocument->GetDocumentURI() is used.
*/
enum PropertiesFile {
eCSS_PROPERTIES,
eXBL_PROPERTIES,
eXUL_PROPERTIES,
eLAYOUT_PROPERTIES,
eFORMS_PROPERTIES,
ePRINTING_PROPERTIES,
eDOM_PROPERTIES,
eHTMLPARSER_PROPERTIES,
eSVG_PROPERTIES,
eBRAND_PROPERTIES,
eCOMMON_DIALOG_PROPERTIES,
eMATHML_PROPERTIES,
eSECURITY_PROPERTIES,
eNECKO_PROPERTIES,
PropertiesFile_COUNT
};
static nsresult ReportToConsole(uint32_t aErrorFlags,
const nsACString& aCategory,
const nsIDocument* aDocument,
PropertiesFile aFile,
const char *aMessageName,
const char16_t **aParams = nullptr,
uint32_t aParamsLength = 0,
nsIURI* aURI = nullptr,
const nsAFlatString& aSourceLine
= EmptyString(),
uint32_t aLineNumber = 0,
uint32_t aColumnNumber = 0);
static nsresult
MaybeReportInterceptionErrorToConsole(nsIDocument* aDocument, nsresult aError);
static void LogMessageToConsole(const char* aMsg, ...);
/**
* Get the localized string named |aKey| in properties file |aFile|.
*/
static nsresult GetLocalizedString(PropertiesFile aFile,
const char* aKey,
nsXPIDLString& aResult);
/**
* 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 sandboxAttr the sandbox attribute
* @return the set of flags (0 if sandboxAttr is null)
*/
static uint32_t ParseSandboxAttributeToFlags(const nsAttrValue* sandboxAttr);
/**
* Helper function that generates a UUID.
*/
static nsresult GenerateUUIDInPlace(nsID& aUUID);
/**
* Fill (with the parameters given) the localized string named |aKey| in
* properties file |aFile|.
*/
private:
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t** aParams,
uint32_t aParamsLength,
nsXPIDLString& aResult);
public:
template<uint32_t N>
static nsresult FormatLocalizedString(PropertiesFile aFile,
const char* aKey,
const char16_t* (&aParams)[N],
nsXPIDLString& aResult)
{
return FormatLocalizedString(aFile, aKey, aParams, N, aResult);
}
/**
* Returns true if aDocument is a chrome document
*/
static bool IsChromeDoc(nsIDocument *aDocument);
/**
* Returns true if aDocument is in a docshell whose parent is the same type
*/
static bool IsChildOfSameType(nsIDocument* aDoc);
/**
'* Returns true if the content-type will be rendered as plain-text.
*/
static bool IsPlainTextType(const nsACString& aContentType);
/**
* Get the script file name to use when compiling the script
* referenced by aURI. In cases where there's no need for any extra
* security wrapper automation the script file name that's returned
* will be the spec in aURI, else it will be the spec in aDocument's
* URI followed by aURI's spec, separated by " -> ". Returns true
* if the script file name was modified, false if it's aURI's
* spec.
*/
static bool GetWrapperSafeScriptFilename(nsIDocument *aDocument,
nsIURI *aURI,
nsACString& aScriptURI);
/**
* Returns true if aDocument belongs to a chrome docshell for
* display purposes. Returns false for null documents or documents
* which do not belong to a docshell.
*/
static bool IsInChromeDocshell(nsIDocument *aDocument);
/**
* Return the content policy service
*/
static nsIContentPolicy *GetContentPolicy();
/**
* Map internal content policy types to external ones.
*/
static nsContentPolicyType InternalContentPolicyTypeToExternal(nsContentPolicyType aType);
/**
* Map internal content policy types to external ones or script types:
* * TYPE_INTERNAL_SCRIPT
* * TYPE_INTERNAL_WORKER
* * TYPE_INTERNAL_SHARED_WORKER
* * TYPE_INTERNAL_SERVICE_WORKER
*
*
* Note: DO NOT call this function unless you know what you're doing!
*/
static nsContentPolicyType InternalContentPolicyTypeToExternalOrScript(nsContentPolicyType aType);
/**
* Map internal content policy types to external ones or preload types:
* * TYPE_INTERNAL_SCRIPT_PRELOAD
* * TYPE_INTERNAL_IMAGE_PRELOAD
* * TYPE_INTERNAL_STYLESHEET_PRELOAD
*
* Note: DO NOT call this function unless you know what you're doing!
*/
static nsContentPolicyType InternalContentPolicyTypeToExternalOrPreload(nsContentPolicyType aType);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to this content or any of its ancestors.
* The method has the side effect to call document's MayDispatchMutationEvent
* using aTargetForSubtreeModified as the parameter.
*
* @param aNode The node to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
* @param aTargetForSubtreeModified The node which is the target of the
* possible DOMSubtreeModified event.
*
* @return true if there are mutation listeners of the specified type
*/
static bool HasMutationListeners(nsINode* aNode,
uint32_t aType,
nsINode* aTargetForSubtreeModified);
/**
* Quick helper to determine whether there are any mutation listeners
* of a given type that apply to any content in this document. It is valid
* to pass null for aDocument here, in which case this function always
* returns true.
*
* @param aDocument The document to search for listeners
* @param aType The type of listener (NS_EVENT_BITS_MUTATION_*)
*
* @return true if there are mutation listeners of the specified type
*/
static bool HasMutationListeners(nsIDocument* aDocument,
uint32_t aType);
/**
* Synchronously fire DOMNodeRemoved on aChild. Only fires the event if
* there really are listeners by checking using the HasMutationListeners
* function above. The function makes sure to hold the relevant objects alive
* for the duration of the event firing. However there are no guarantees
* that any of the objects are alive by the time the function returns.
* If you depend on that you need to hold references yourself.
*
* @param aChild The node to fire DOMNodeRemoved at.
* @param aParent The parent of aChild.
* @param aOwnerDoc The ownerDocument of aChild.
*/
static void MaybeFireNodeRemoved(nsINode* aChild, nsINode* aParent,
nsIDocument* aOwnerDoc);
/**
* This method creates and dispatches a trusted event.
* Works only with events which can be created by calling
* nsIDOMDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* nsIDOMEventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see nsIDOMEventTarget::DispatchEvent.
*/
static nsresult DispatchTrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a untrusted event.
* Works only with events which can be created by calling
* nsIDOMDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* nsIDOMEventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see nsIDOMEventTarget::DispatchEvent.
*/
static nsresult DispatchUntrustedEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a trusted event to the chrome
* event handler (the parent object of the DOM Window in the event target
* chain). Note, chrome event handler is used even if aTarget is a chrome
* object. Use DispatchEventOnlyToChrome if the normal event dispatching is
* wanted in case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDOMDocument::CreateEvent() with parameter "Events".
* @param aDocument The document which will be used to create the event,
* and whose window's chrome handler will be used to
* dispatch the event.
* @param aTarget The target of the event, used for event->SetTarget()
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see nsIDOMEventTarget::DispatchEvent.
*/
static nsresult DispatchChromeEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* This method creates and dispatches a trusted event.
* If aTarget is not a chrome object, the nearest chrome object in the
* propagation path will be used as the start of the event target chain.
* This method is different than DispatchChromeEvent, which always dispatches
* events to chrome event handler. DispatchEventOnlyToChrome works like
* DispatchTrustedEvent in the case aTarget is a chrome object.
* Works only with events which can be created by calling
* nsIDOMDocument::CreateEvent() with parameter "Events".
* @param aDoc The document which will be used to create the event.
* @param aTarget The target of the event, should be QIable to
* nsIDOMEventTarget.
* @param aEventName The name of the event.
* @param aCanBubble Whether the event can bubble.
* @param aCancelable Is the event cancelable.
* @param aDefaultAction Set to true if default action should be taken,
* see nsIDOMEventTarget::DispatchEvent.
*/
static nsresult DispatchEventOnlyToChrome(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool *aDefaultAction = nullptr);
/**
* Determines if an event attribute name (such as onclick) is valid for
* a given element type. Types are from the EventNameType enumeration
* defined above.
*
* @param aName the event name to look up
* @param aType the type of content
*/
static bool IsEventAttributeName(nsIAtom* aName, int32_t aType);
/**
* Return the event message for the event with the given name. The name is
* the event name with the 'on' prefix. Returns eUnidentifiedEvent if the
* event doesn't match a known event name.
*
* @param aName the event name to look up
*/
static mozilla::EventMessage GetEventMessage(nsIAtom* aName);
/**
* Return the EventClassID for the event with the given name. The name is the
* event name *without* the 'on' prefix. Returns eBasicEventClass if the event
* is not known to be of any particular event class.
*
* @param aName the event name to look up
*/
static mozilla::EventClassID GetEventClassID(const nsAString& aName);
/**
* Return the event message and atom for the event with the given name.
* The name is the event name *without* the 'on' prefix.
* Returns eUnidentifiedEvent on the aEventID if the
* event doesn't match a known event name in the category.
*
* @param aName the event name to look up
* @param aEventClassID only return event id for aEventClassID
*/
static nsIAtom* GetEventMessageAndAtom(const nsAString& aName,
mozilla::EventClassID aEventClassID,
mozilla::EventMessage* aEventMessage);
/**
* Used only during traversal of the XPCOM graph by the cycle
* collector: push a pointer to the listener manager onto the
* children deque, if it exists. Do nothing if there is no listener
* manager.
*
* Crucially: does not perform any refcounting operations.
*
* @param aNode The node to traverse.
* @param children The buffer to push a listener manager pointer into.
*/
static void TraverseListenerManager(nsINode *aNode,
nsCycleCollectionTraversalCallback &cb);
/**
* Get the eventlistener manager for aNode, creating it if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetListenerManagerForNode(nsINode* aNode);
/**
* Get the eventlistener manager for aNode, returning null if it does not
* already exist.
*
* @param aNode The node for which to get the eventlistener manager.
*/
static mozilla::EventListenerManager*
GetExistingListenerManagerForNode(const nsINode* aNode);
static void UnmarkGrayJSListenersInCCGenerationDocuments();
/**
* Remove the eventlistener manager for aNode.
*
* @param aNode The node for which to remove the eventlistener manager.
*/
static void RemoveListenerManager(nsINode *aNode);
static bool IsInitialized()
{
return sInitialized;
}
/**
* Checks if the localname/prefix/namespace triple is valid wrt prefix
* and namespace according to the Namespaces in XML and DOM Code
* specfications.
*
* @param aLocalname localname of the node
* @param aPrefix prefix of the node
* @param aNamespaceID namespace of the node
*/
static bool IsValidNodeName(nsIAtom *aLocalName, nsIAtom *aPrefix,
int32_t aNamespaceID);
/**
* Creates a DocumentFragment from text using a context node to resolve
* namespaces.
*
* Note! In the HTML case with the HTML5 parser enabled, this is only called
* from Range.createContextualFragment() and the implementation here is
* quirky accordingly (html context node behaves like a body context node).
* If you don't want that quirky behavior, don't use this method as-is!
*
* @param aContextNode the node which is used to resolve namespaces
* @param aFragment the string which is parsed to a DocumentFragment
* @param aReturn the resulting fragment
* @param aPreventScriptExecution whether to mark scripts as already started
*/
static nsresult CreateContextualFragment(nsINode* aContextNode,
const nsAString& aFragment,
bool aPreventScriptExecution,
nsIDOMDocumentFragment** aReturn);
static already_AddRefed<mozilla::dom::DocumentFragment>
CreateContextualFragment(nsINode* aContextNode, const nsAString& aFragment,
bool aPreventScriptExecution,
mozilla::ErrorResult& aRv);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the HTML parser.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container
* @param aContextLocalName local name of context node
* @param aContextNamespace namespace of context node
* @param aQuirks true to make <table> not close <p>
* @param aPreventScriptExecution true to prevent scripts from executing;
* don't set to false when parsing into a target node that has been
* bound to tree.
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseFragmentHTML(const nsAString& aSourceBuffer,
nsIContent* aTargetNode,
nsIAtom* aContextLocalName,
int32_t aContextNamespace,
bool aQuirks,
bool aPreventScriptExecution);
/**
* Invoke the fragment parsing algorithm (innerHTML) using the XML parser.
*
* @param aSourceBuffer the string being set as innerHTML
* @param aTargetNode the target container
* @param aTagStack the namespace mapping context
* @param aPreventExecution whether to mark scripts as already started
* @param aReturn the result fragment
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, a return code from the XML parser.
*/
static nsresult ParseFragmentXML(const nsAString& aSourceBuffer,
nsIDocument* aDocument,
nsTArray<nsString>& aTagStack,
bool aPreventScriptExecution,
nsIDOMDocumentFragment** aReturn);
/**
* Parse a string into a document using the HTML parser.
* Script elements are marked unexecutable.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aTargetDocument the document object to parse into. Must not have
* child nodes.
* @param aScriptingEnabledForNoscriptParsing whether <noscript> is parsed
* as if scripting was enabled
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ParseDocumentHTML(const nsAString& aSourceBuffer,
nsIDocument* aTargetDocument,
bool aScriptingEnabledForNoscriptParsing);
/**
* Converts HTML source to plain text by parsing the source and using the
* plain text serializer on the resulting tree.
*
* @param aSourceBuffer the string to parse as an HTML document
* @param aResultBuffer the string where the plain text result appears;
* may be the same string as aSourceBuffer
* @param aFlags Flags from nsIDocumentEncoder.
* @param aWrapCol Number of columns after which to line wrap; 0 for no
* auto-wrapping
* @return NS_ERROR_DOM_INVALID_STATE_ERR if a re-entrant attempt to parse
* fragments is made, NS_ERROR_OUT_OF_MEMORY if aSourceBuffer is too
* long and NS_OK otherwise.
*/
static nsresult ConvertToPlainText(const nsAString& aSourceBuffer,
nsAString& aResultBuffer,
uint32_t aFlags,
uint32_t aWrapCol);
/**
* Sets the text contents of a node by replacing all existing children
* with a single text child.
*
* The function always notifies.
*
* Will reuse the first text child if one is available. Will not reuse
* existing cdata children.
*
* @param aContent Node to set contents of.
* @param aValue Value to set contents to.
* @param aTryReuse When true, the function will try to reuse an existing
* textnodes rather than always creating a new one.
*/
static nsresult SetNodeTextContent(nsIContent* aContent,
const nsAString& aValue,
bool aTryReuse);
/**
* Get the textual contents of a node. This is a concatenation of all
* textnodes that are direct or (depending on aDeep) indirect children
* of the node.
*
* NOTE! No serialization takes place and <br> elements
* are not converted into newlines. Only textnodes and cdata nodes are
* added to the result.
*
* @see nsLayoutUtils::GetFrameTextContent
*
* @param aNode Node to get textual contents of.
* @param aDeep If true child elements of aNode are recursivly descended
* into to find text children.
* @param aResult the result. Out param.
* @return false on out of memory errors, true otherwise.
*/
MOZ_WARN_UNUSED_RESULT
static bool GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
static void GetNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult);
/**
* Same as GetNodeTextContents but appends the result rather than sets it.
*/
static bool AppendNodeTextContent(nsINode* aNode, bool aDeep,
nsAString& aResult, const mozilla::fallible_t&);
/**
* Utility method that checks if a given node has any non-empty children. This
* method does not descend recursively into children by default.
*
* @param aDiscoverMode Set to eRecurseIntoChildren to descend recursively
* into children.
*/
enum TextContentDiscoverMode : uint8_t {
eRecurseIntoChildren, eDontRecurseIntoChildren
};
static bool HasNonEmptyTextContent(
nsINode* aNode,
TextContentDiscoverMode aDiscoverMode = eDontRecurseIntoChildren);
/**
* Delete strings allocated for nsContentList matches
*/
static void DestroyMatchString(void* aData);
/**
* Unbinds the content from the tree and nulls it out if it's not null.
*/
static void DestroyAnonymousContent(nsCOMPtr<nsIContent>* aContent);
static void DestroyAnonymousContent(nsCOMPtr<Element>* aElement);
/*
* Notify when the first XUL menu is opened and when the all XUL menus are
* closed. At opening, aInstalling should be TRUE, otherwise, it should be
* FALSE.
*/
static void NotifyInstalledMenuKeyboardListener(bool aInstalling);
/**
* Returns true if aPrincipal is the system principal.
*/
static bool IsSystemPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is an nsExpandedPrincipal.
*/
static bool IsExpandedPrincipal(nsIPrincipal* aPrincipal);
/**
* Returns true if aPrincipal is the system or an nsExpandedPrincipal.
*/
static bool IsSystemOrExpandedPrincipal(nsIPrincipal* aPrincipal)
{
return IsSystemPrincipal(aPrincipal) || IsExpandedPrincipal(aPrincipal);
}
/**
* Gets the system principal from the security manager.
*/
static nsIPrincipal* GetSystemPrincipal();
/**
* Gets the null subject principal singleton. This is only useful for
* assertions.
*/
static nsIPrincipal* GetNullSubjectPrincipal() { return sNullSubjectPrincipal; }
/**
* *aResourcePrincipal is a principal describing who may access the contents
* of a resource. The resource can only be consumed by a principal that
* subsumes *aResourcePrincipal. MAKE SURE THAT NOTHING EVER ACTS WITH THE
* AUTHORITY OF *aResourcePrincipal.
* It may be null to indicate that the resource has no data from any origin
* in it yet and anything may access the resource.
* Additional data is being mixed into the resource from aExtraPrincipal
* (which may be null; if null, no data is being mixed in and this function
* will do nothing). Update *aResourcePrincipal to reflect the new data.
* If *aResourcePrincipal subsumes aExtraPrincipal, nothing needs to change,
* otherwise *aResourcePrincipal is replaced with the system principal.
* Returns true if *aResourcePrincipal changed.
*/
static bool CombineResourcePrincipals(nsCOMPtr<nsIPrincipal>* aResourcePrincipal,
nsIPrincipal* aExtraPrincipal);
/**
* Trigger a link with uri aLinkURI. If aClick is false, this triggers a
* mouseover on the link, otherwise it triggers a load after doing a
* security check using aContent's principal.
*
* @param aContent the node on which a link was triggered.
* @param aPresContext the pres context, must be non-null.
* @param aLinkURI the URI of the link, must be non-null.
* @param aTargetSpec the target (like target=, may be empty).
* @param aClick whether this was a click or not (if false, this method
* assumes you just hovered over the link).
* @param aIsUserTriggered whether the user triggered the link. This would be
* false for loads from auto XLinks or from the
* click() method if we ever implement it.
* @param aIsTrusted If false, JS Context will be pushed to stack
* when the link is triggered.
*/
static void TriggerLink(nsIContent *aContent, nsPresContext *aPresContext,
nsIURI *aLinkURI, const nsString& aTargetSpec,
bool aClick, bool aIsUserTriggered,
bool aIsTrusted);
/**
* Get the link location.
*/
static void GetLinkLocation(mozilla::dom::Element* aElement,
nsString& aLocationString);
/**
* Return top-level widget in the parent chain.
*/
static nsIWidget* GetTopLevelWidget(nsIWidget* aWidget);
/**
* Return the localized ellipsis for UI.
*/
static const nsDependentString GetLocalizedEllipsis();
/**
* Get the candidates for accelkeys for aDOMKeyEvent.
*
* @param aDOMKeyEvent [in] the key event for accelkey handling.
* @param aCandidates [out] the candidate shortcut key combination list.
* the first item is most preferred.
*/
static void GetAccelKeyCandidates(nsIDOMKeyEvent* aDOMKeyEvent,
nsTArray<nsShortcutCandidate>& aCandidates);
/**
* Get the candidates for accesskeys for aNativeKeyEvent.
*
* @param aNativeKeyEvent [in] the key event for accesskey handling.
* @param aCandidates [out] the candidate access key list.
* the first item is most preferred.
*/
static void GetAccessKeyCandidates(
mozilla::WidgetKeyboardEvent* aNativeKeyEvent,
nsTArray<uint32_t>& aCandidates);
/**
* Hide any XUL popups associated with aDocument, including any documents
* displayed in child frames. Does nothing if aDocument is null.
*/
static void HidePopupsInDocument(nsIDocument* aDocument);
/**
* Retrieve the current drag session, or null if no drag is currently occuring
*/
static already_AddRefed<nsIDragSession> GetDragSession();
/*
* Initialize and set the dataTransfer field of an WidgetDragEvent.
*/
static nsresult SetDataTransferInEvent(mozilla::WidgetDragEvent* aDragEvent);
// filters the drag and drop action to fit within the effects allowed and
// returns it.
static uint32_t FilterDropEffect(uint32_t aAction, uint32_t aEffectAllowed);
/*
* Return true if the target of a drop event is a content document that is
* an ancestor of the document for the source of the drag.
*/
static bool CheckForSubFrameDrop(nsIDragSession* aDragSession,
mozilla::WidgetDragEvent* aDropEvent);
/**
* Return true if aURI is a local file URI (i.e. file://).
*/
static bool URIIsLocalFile(nsIURI *aURI);
/**
* Given a URI, return set beforeHash to the part before the '#', and
* afterHash to the remainder of the URI, including the '#'.
*/
static nsresult SplitURIAtHash(nsIURI *aURI,
nsACString &aBeforeHash,
nsACString &aAfterHash);
/**
* Get the application manifest URI for this document. The manifest URI
* is specified in the manifest= attribute of the root element of the
* document.
*
* @param aDocument The document that lists the manifest.
* @param aURI The manifest URI.
*/
static void GetOfflineAppManifest(nsIDocument *aDocument, nsIURI **aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIURI *aURI);
/**
* Check whether an application should be allowed to use offline APIs.
*/
static bool OfflineAppAllowed(nsIPrincipal *aPrincipal);
/**
* If offline-apps.allow_by_default is true, we set offline-app permission
* for the principal and return true. Otherwise false.
*/
static bool MaybeAllowOfflineAppByDefault(nsIPrincipal *aPrincipal, nsIDOMWindow *aWindow);
/**
* Increases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*/
static void AddScriptBlocker();
/**
* Decreases the count of blockers preventing scripts from running.
* NOTE: You might want to use nsAutoScriptBlocker rather than calling
* this directly
*
* WARNING! Calling this function could synchronously execute scripts.
*/
static void RemoveScriptBlocker();
/**
* Add a runnable that is to be executed as soon as it's safe to execute
* scripts.
* NOTE: If it's currently safe to execute scripts, aRunnable will be run
* synchronously before the function returns.
*
* @param aRunnable The nsIRunnable to run as soon as it's safe to execute
* scripts. Passing null is allowed and results in nothing
* happening. It is also allowed to pass an object that
* has not yet been AddRefed.
* @return false on out of memory, true otherwise.
*/
static bool AddScriptRunner(nsIRunnable* aRunnable);
/**
* Returns true if it's safe to execute content script and false otherwise.
*
* The only known case where this lies is mutation events. They run, and can
* run anything else, when this function returns false, but this is ok.
*/
static bool IsSafeToRunScript() {
return sScriptBlockerCount == 0;
}
/**
* Call this function if !IsSafeToRunScript() and we fail to run the script
* (rather than using AddScriptRunner as we usually do). |aDocument| is
* optional as it is only used for showing the URL in the console.
*/
static void WarnScriptWasIgnored(nsIDocument* aDocument);
/**
* Add a "synchronous section", in the form of an nsIRunnable run once the
* event loop has reached a "stable state". |aRunnable| must not cause any
* queued events to be processed (i.e. must not spin the event loop).
* We've reached a stable state when the currently executing task/event has
* finished, see
* http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#synchronous-section
* In practice this runs aRunnable once the currently executing event
* finishes. If called multiple times per task/event, all the runnables will
* be executed, in the order in which RunInStableState() was called.
*/
static void RunInStableState(already_AddRefed<nsIRunnable> aRunnable);
/* Add a "synchronous section", in the form of an nsIRunnable run once the
* event loop has reached a "metastable state". |aRunnable| must not cause any
* queued events to be processed (i.e. must not spin the event loop).
* We've reached a metastable state when the currently executing task or
* microtask has finished. This is not specced at this time.
* In practice this runs aRunnable once the currently executing task or
* microtask finishes. If called multiple times per microtask, all the
* runnables will be executed, in the order in which RunInMetastableState()
* was called
*/
static void RunInMetastableState(already_AddRefed<nsIRunnable> aRunnable);
/**
* Retrieve information about the viewport as a data structure.
* This will return information in the viewport META data section
* of the document. This can be used in lieu of ProcessViewportInfo(),
* which places the viewport information in the document header instead
* of returning it directly.
*
* @param aDisplayWidth width of the on-screen display area for this
* document, in device pixels.
* @param aDisplayHeight height of the on-screen display area for this
* document, in device pixels.
*
* NOTE: If the site is optimized for mobile (via the doctype), this
* will return viewport information that specifies default information.
*/
static nsViewportInfo GetViewportInfo(nsIDocument* aDocument,
const mozilla::ScreenIntSize& aDisplaySize);
// Call EnterMicroTask when you're entering JS execution.
// Usually the best way to do this is to use nsAutoMicroTask.
static void EnterMicroTask();
static void LeaveMicroTask();
static bool IsInMicroTask();
static uint32_t MicroTaskLevel();
static void SetMicroTaskLevel(uint32_t aLevel);
static void PerformMainThreadMicroTaskCheckpoint();
/* Process viewport META data. This gives us information for the scale
* and zoom of a page on mobile devices. We stick the information in
* the document header and use it later on after rendering.
*
* See Bug #436083
*/
static nsresult ProcessViewportInfo(nsIDocument *aDocument,
const nsAString &viewportInfo);
static nsIScriptContext* GetContextForEventHandlers(nsINode* aNode,
nsresult* aRv);
static JSContext *GetCurrentJSContext();
static JSContext *GetSafeJSContext();
static JSContext *GetCurrentJSContextForThread();
static JSContext *GetDefaultJSContextForThread();
inline static JSContext *RootingCx() { return GetSafeJSContext(); }
inline static JSContext *RootingCxForThread() { return GetDefaultJSContextForThread(); }
/**
* Case insensitive comparison between two strings. However it only ignores
* case for ASCII characters a-z.
*/
static bool EqualsIgnoreASCIICase(const nsAString& aStr1,
const nsAString& aStr2);
/**
* Convert ASCII A-Z to a-z.
*/
static void ASCIIToLower(nsAString& aStr);
static void ASCIIToLower(const nsAString& aSource, nsAString& aDest);
/**
* Convert ASCII a-z to A-Z.
*/
static void ASCIIToUpper(nsAString& aStr);
static void ASCIIToUpper(const nsAString& aSource, nsAString& aDest);
/**
* Return whether aStr contains an ASCII uppercase character.
*/
static bool StringContainsASCIIUpper(const nsAString& aStr);
// Returns NS_OK for same origin, error (NS_ERROR_DOM_BAD_URI) if not.
static nsresult CheckSameOrigin(nsIChannel *aOldChannel, nsIChannel *aNewChannel);
static nsIInterfaceRequestor* SameOriginChecker();
/**
* Get the Origin of the passed in nsIPrincipal or nsIURI. If the passed in
* nsIURI or the URI of the passed in nsIPrincipal does not have a host, the
* origin is set to 'null'.
*
* The ASCII versions return a ASCII strings that are puny-code encoded,
* suitable for, for example, header values. The UTF versions return strings
* containing international characters.
*
* @pre aPrincipal/aOrigin must not be null.
*
* @note this should be used for HTML5 origin determination.
*/
static nsresult GetASCIIOrigin(nsIPrincipal* aPrincipal,
nsACString& aOrigin);
static nsresult GetASCIIOrigin(nsIURI* aURI, nsACString& aOrigin);
static nsresult GetUTFOrigin(nsIPrincipal* aPrincipal,
nsAString& aOrigin);
static nsresult GetUTFOrigin(nsIURI* aURI, nsAString& aOrigin);
/**
* This method creates and dispatches "command" event, which implements
* nsIDOMXULCommandEvent.
* If aShell is not null, dispatching goes via
* nsIPresShell::HandleDOMEventWithTarget.
*/
static nsresult DispatchXULCommand(nsIContent* aTarget,
bool aTrusted,
nsIDOMEvent* aSourceEvent = nullptr,
nsIPresShell* aShell = nullptr,
bool aCtrl = false,
bool aAlt = false,
bool aShift = false,
bool aMeta = false);
/**
* Gets the nsIDocument given the script context. Will return nullptr on failure.
*
* @param aScriptContext the script context to get the document for; can be null
*
* @return the document associated with the script context
*/
static nsIDocument*
GetDocumentFromScriptContext(nsIScriptContext* aScriptContext);
static bool CheckMayLoad(nsIPrincipal* aPrincipal, nsIChannel* aChannel, bool aAllowIfInheritsPrincipal);
/**
* The method checks whether the caller can access native anonymous content.
* If there is no JS in the stack or privileged JS is running, this
* method returns true, otherwise false.
*/
static bool CanAccessNativeAnon();
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
const nsIID* aIID, JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, aIID, vp, aAllowWrapping);
}
// Same as the WrapNative above, but use this one if aIID is nsISupports' IID.
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, nullptr, nullptr, vp, aAllowWrapping);
}
MOZ_WARN_UNUSED_RESULT
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping = true)
{
return WrapNative(cx, native, cache, nullptr, vp, aAllowWrapping);
}
/**
* Creates an arraybuffer from a binary string.
*/
static nsresult CreateArrayBuffer(JSContext *aCx, const nsACString& aData,
JSObject** aResult);
static nsresult CreateBlobBuffer(JSContext* aCx,
nsISupports* aParent,
const nsACString& aData,
JS::MutableHandle<JS::Value> aBlob);
static void StripNullChars(const nsAString& aInStr, nsAString& aOutStr);
/**
* Strip all \n, \r and nulls from the given string
* @param aString the string to remove newlines from [in/out]
*/
static void RemoveNewlines(nsString &aString);
/**
* Convert Windows and Mac platform linebreaks to \n.
* @param aString the string to convert the newlines inside [in/out]
*/
static void PlatformToDOMLineBreaks(nsString &aString);
MOZ_WARN_UNUSED_RESULT
static bool PlatformToDOMLineBreaks(nsString &aString,
const mozilla::fallible_t&);
/**
* Populates aResultString with the contents of the string-buffer aBuf, up
* to aBuf's null-terminator. aBuf must not be null. Ownership of the string
* is not transferred.
*/
static void PopulateStringFromStringBuffer(nsStringBuffer* aBuf,
nsAString& aResultString);
static bool IsHandlingKeyBoardEvent()
{
return sIsHandlingKeyBoardEvent;
}
static void SetIsHandlingKeyBoardEvent(bool aHandling)
{
sIsHandlingKeyBoardEvent = aHandling;
}
/**
* Utility method for getElementsByClassName. aRootNode is the node (either
* document or element), which getElementsByClassName was called on.
*/
static already_AddRefed<nsContentList>
GetElementsByClassName(nsINode* aRootNode, const nsAString& aClasses)
{
NS_PRECONDITION(aRootNode, "Must have root node");
return NS_GetFuncStringHTMLCollection(aRootNode, MatchClassNames,
DestroyClassNameArray,
AllocClassMatchingInfo,
aClasses);
}
/**
* Returns a presshell for this document, if there is one. This will be
* aDoc's direct presshell if there is one, otherwise we'll look at all
* ancestor documents to try to find a presshell, so for example this can
* still find a presshell for documents in display:none frames that have
* no presentation. So you have to be careful how you use this presshell ---
* getting generic data like a device context or widget from it is OK, but it
* might not be this document's actual presentation.
*/
static nsIPresShell* FindPresShellForDocument(const nsIDocument* aDoc);
/**
* Returns the widget for this document if there is one. Looks at all ancestor
* documents to try to find a widget, so for example this can still find a
* widget for documents in display:none frames that have no presentation.
*/
static nsIWidget* WidgetForDocument(const nsIDocument* aDoc);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
LayerManagerForDocument(const nsIDocument *aDoc, bool *aAllowRetaining = nullptr);
/**
* Returns a layer manager to use for the given document. Basically we
* look up the document hierarchy for the first document which has
* a presentation with an associated widget, and use that widget's
* layer manager. In addition to the normal layer manager lookup this will
* specifically request a persistent layer manager. This means that the layer
* manager is expected to remain the layer manager for the document in the
* forseeable future. This function should be used carefully as it may change
* the document's layer manager.
*
* @param aDoc the document for which to return a layer manager.
* @param aAllowRetaining an outparam that states whether the returned
* layer manager should be used for retained layers
*/
static already_AddRefed<mozilla::layers::LayerManager>
PersistentLayerManagerForDocument(nsIDocument *aDoc, bool *aAllowRetaining = nullptr);
/**
* Determine whether a content node is focused or not,
*
* @param aContent the content node to check
* @return true if the content node is focused, false otherwise.
*/
static bool IsFocusedContent(const nsIContent *aContent);
/**
* Returns true if the DOM full-screen API is enabled.
*/
static bool IsFullScreenApiEnabled();
/**
* Returns true if requests for full-screen are allowed in the current
* context. Requests are only allowed if the user initiated them (like with
* a mouse-click or key press), unless this check has been disabled by
* setting the pref "full-screen-api.allow-trusted-requests-only" to false.
*/
static bool IsRequestFullScreenAllowed();
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments
* is restricted to chrome code.
*/
static bool IsCutCopyRestricted()
{
return !sIsCutCopyAllowed;
}
/**
* Returns true if calling execCommand with 'cut' or 'copy' arguments is
* allowed in the current context. These are only allowed if the user initiated
* them (like with a mouse-click or key press).
*/
static bool IsCutCopyAllowed();
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsPerformanceTimingEnabled()
{
return sIsPerformanceTimingEnabled;
}
/*
* Returns true if user timing API should print to console.
*/
static bool IsUserTimingLoggingEnabled()
{
return sIsUserTimingLoggingEnabled;
}
/*
* Returns true if the performance timing APIs are enabled.
*/
static bool IsResourceTimingEnabled()
{
return sIsResourceTimingEnabled;
}
/*
* Returns true if notification should be sent for peformance timing events.
*/
static bool SendPerformanceTimingNotifications()
{
return sSendPerformanceTimingNotifications;
}
/*
* Returns true if ServiceWorker Interception is enabled by pref.
*/
static bool ServiceWorkerInterceptionEnabled()
{
return sSWInterceptionEnabled;
}
/*
* Returns true if the frame timing APIs are enabled.
*/
static bool IsFrameTimingEnabled();
/*
* Returns true if URL setters should percent encode the Hash/Ref segment
* and getters should return the percent decoded value of the segment
*/
static bool EncodeDecodeURLHash()
{
return sEncodeDecodeURLHash;
}
/*
* Returns true if URL getters should percent decode the value of the segment
*/
static bool GettersDecodeURLHash()
{
return sGettersDecodeURLHash && sEncodeDecodeURLHash;
}
/*
* Returns true if the browser should attempt to prevent content scripts
* from collecting distinctive information about the browser that could
* be used to "fingerprint" and track the user across websites.
*/
static bool ResistFingerprinting()
{
return sPrivacyResistFingerprinting;
}
/**
* Returns true if the doc tree branch which contains aDoc contains any
* plugins which we don't control event dispatch for, i.e. do any plugins
* in the same tab as this document receive key events outside of our
* control? This always returns false on MacOSX.
*/
static bool HasPluginWithUncontrolledEventDispatch(nsIDocument* aDoc);
/**
* Return true if this doc is controlled by a ServiceWorker.
*/
static bool IsControlledByServiceWorker(nsIDocument* aDocument);
/**
* Fire mutation events for changes caused by parsing directly into a
* context node.
*
* @param aDoc the document of the node
* @param aDest the destination node that got stuff appended to it
* @param aOldChildCount the number of children the node had before parsing
*/
static void FireMutationEventsForDirectParsing(nsIDocument* aDoc,
nsIContent* aDest,
int32_t aOldChildCount);
/**
* Returns true if the content is in a document and contains a plugin
* which we don't control event dispatch for, i.e. do any plugins in this
* doc tree receive key events outside of our control? This always returns
* false on MacOSX.
*/
static bool HasPluginWithUncontrolledEventDispatch(nsIContent* aContent);
/**
* Returns the root document in a document hierarchy. Normally this
* will be the chrome document.
*/
static nsIDocument* GetRootDocument(nsIDocument* aDoc);
/**
* Returns true if aWin and the current pointer lock document
* have common scriptable top window.
*/
static bool IsInPointerLockContext(nsIDOMWindow* aWin);
/**
* Returns the time limit on handling user input before
* EventStateManager::IsHandlingUserInput() stops returning true.
* This enables us to detect long running user-generated event handlers.
*/
static TimeDuration HandlingUserInputTimeout();
static void GetShiftText(nsAString& text);
static void GetControlText(nsAString& text);
static void GetMetaText(nsAString& text);
static void GetOSText(nsAString& text);
static void GetAltText(nsAString& text);
static void GetModifierSeparatorText(nsAString& text);
/**
* Returns if aContent has a tabbable subdocument.
* A sub document isn't tabbable when it's a zombie document.
*
* @param aElement element to test.
*
* @return Whether the subdocument is tabbable.
*/
static bool IsSubDocumentTabbable(nsIContent* aContent);
/**
* Returns if aNode ignores user focus.
*
* @param aNode node to test
*
* @return Whether the node ignores user focus.
*/
static bool IsUserFocusIgnored(nsINode* aNode);
/**
* Returns if aContent has the 'scrollgrab' property.
* aContent may be null (in this case false is returned).
*/
static bool HasScrollgrab(nsIContent* aContent);
/**
* Flushes the layout tree (recursively)
*
* @param aWindow the window the flush should start at
*
*/
static void FlushLayoutForTree(nsIDOMWindow* aWindow);
/**
* Returns true if content with the given principal is allowed to use XUL
* and XBL and false otherwise.
*/
static bool AllowXULXBLForPrincipal(nsIPrincipal* aPrincipal);
/**
* Perform cleanup that's appropriate for XPCOM shutdown.
*/
static void XPCOMShutdown();
/**
* Checks if internal PDF viewer is enabled.
*/
static bool IsPDFJSEnabled();
/**
* Checks if internal SWF player is enabled.
*/
static bool IsSWFPlayerEnabled();
enum ContentViewerType
{
TYPE_UNSUPPORTED,
TYPE_CONTENT,
TYPE_PLUGIN,
TYPE_UNKNOWN
};
static already_AddRefed<nsIDocumentLoaderFactory>
FindInternalContentViewer(const nsACString& aType,
ContentViewerType* aLoaderType = nullptr);
/**
* This helper method returns true if the aPattern pattern matches aValue.
* aPattern should not contain leading and trailing slashes (/).
* The pattern has to match the entire value not just a subset.
* aDocument must be a valid pointer (not null).
*
* This is following the HTML5 specification:
* http://dev.w3.org/html5/spec/forms.html#attr-input-pattern
*
* WARNING: This method mutates aPattern and aValue!
*
* @param aValue the string to check.
* @param aPattern the string defining the pattern.
* @param aDocument the owner document of the element.
* @result whether the given string is matches the pattern.
*/
static bool IsPatternMatching(nsAString& aValue, nsAString& aPattern,
nsIDocument* aDocument);
/**
* Calling this adds support for
* ontouch* event handler DOM attributes.
*/
static void InitializeTouchEventTable();
/**
* Test whether the given URI always inherits a security context
* from the document it comes from.
*/
static nsresult URIInheritsSecurityContext(nsIURI *aURI, bool *aResult);
/**
* Called before a channel is created to query whether the new
* channel should inherit the principal.
*
* The argument aLoadingPrincipal must not be null. The argument
* aURI must be the URI of the new channel. If aInheritForAboutBlank
* is true, then about:blank will be told to inherit the principal.
* If aForceInherit is true, the new channel will be told to inherit
* the principal no matter what.
*
* The return value is whether the new channel should inherit
* the principal.
*/
static bool ChannelShouldInheritPrincipal(nsIPrincipal* aLoadingPrincipal,
nsIURI* aURI,
bool aInheritForAboutBlank,
bool aForceInherit);
static nsresult Btoa(const nsAString& aBinaryData,
nsAString& aAsciiBase64String);
static nsresult Atob(const nsAString& aAsciiString,
nsAString& aBinaryData);
/**
* Returns whether the input element passed in parameter has the autocomplete
* functionality enabled. It is taking into account the form owner.
* NOTE: the caller has to make sure autocomplete makes sense for the
* element's type.
*
* @param aInput the input element to check. NOTE: aInput can't be null.
* @return whether the input element has autocomplete enabled.
*/
static bool IsAutocompleteEnabled(nsIDOMHTMLInputElement* aInput);
enum AutocompleteAttrState : uint8_t
{
eAutocompleteAttrState_Unknown = 1,
eAutocompleteAttrState_Invalid,
eAutocompleteAttrState_Valid,
};
/**
* Parses the value of the autocomplete attribute into aResult, ensuring it's
* composed of valid tokens, otherwise the value "" is used.
* Note that this method is used for form fields, not on a <form> itself.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
nsAString& aResult,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown);
/* Variation that is used to retrieve a dictionary of the parts of the
* autocomplete attribute.
*
* @return whether aAttr was valid and can be cached.
*/
static AutocompleteAttrState
SerializeAutocompleteAttribute(const nsAttrValue* aAttr,
mozilla::dom::AutocompleteInfo& aInfo,
AutocompleteAttrState aCachedState =
eAutocompleteAttrState_Unknown);
/**
* This will parse aSource, to extract the value of the pseudo attribute
* with the name specified in aName. See
* http://www.w3.org/TR/xml-stylesheet/#NT-StyleSheetPI for the specification
* which is used to parse aSource.
*
* @param aSource the string to parse
* @param aName the name of the attribute to get the value for
* @param aValue [out] the value for the attribute with name specified in
* aAttribute. Empty if the attribute isn't present.
* @return true if the attribute exists and was successfully parsed.
* false if the attribute doesn't exist, or has a malformed
* value, such as an unknown or unterminated entity.
*/
static bool GetPseudoAttributeValue(const nsString& aSource, nsIAtom *aName,
nsAString& aValue);
/**
* Returns true if the language name is a version of JavaScript and
* false otherwise
*/
static bool IsJavaScriptLanguage(const nsString& aName);
/**
* Returns the JSVersion for a string of the form '1.n', n = 0, ..., 8, and
* JSVERSION_UNKNOWN for other strings.
*/
static JSVersion ParseJavascriptVersion(const nsAString& aVersionStr);
static bool IsJavascriptMIMEType(const nsAString& aMIMEType);
static void SplitMimeType(const nsAString& aValue, nsString& aType,
nsString& aParams);
/**
* Function checks if the user is idle.
*
* @param aRequestedIdleTimeInMS The idle observer's requested idle time.
* @param aUserIsIdle boolean indicating if the user
* is currently idle or not. *
* @return NS_OK NS_OK returned if the requested idle service and
* the current idle time were successfully obtained.
* NS_ERROR_FAILURE returned if the the requested
* idle service or the current idle were not obtained.
*/
static nsresult IsUserIdle(uint32_t aRequestedIdleTimeInMS, bool* aUserIsIdle);
/**
* Takes a selection, and a text control element (<input> or <textarea>), and
* returns the offsets in the text content corresponding to the selection.
* The selection's anchor and focus must both be in the root node passed or a
* descendant.
*
* @param aSelection Selection to check
* @param aRoot Root <input> or <textarea> element
* @param aOutStartOffset Output start offset
* @param aOutEndOffset Output end offset
*/
static void GetSelectionInTextControl(mozilla::dom::Selection* aSelection,
Element* aRoot,
int32_t& aOutStartOffset,
int32_t& aOutEndOffset);
/**
* Takes a selection, and return selection's bounding rect which is relative
* to root frame.
*
* @param aSel Selection to check
*/
static nsRect GetSelectionBoundingRect(mozilla::dom::Selection* aSel);
/**
* Takes a frame for anonymous content within a text control (<input> or
* <textarea>), and returns an offset in the text content, adjusted for a
* trailing <br> frame.
*
* @param aOffsetFrame Frame for the text content in which the offset
* lies
* @param aOffset Offset as calculated by GetContentOffsetsFromPoint
* @param aOutOffset Output adjusted offset
*
* @see GetSelectionInTextControl for the original basis of this function.
*/
static int32_t GetAdjustedOffsetInTextControl(nsIFrame* aOffsetFrame,
int32_t aOffset);
static nsIEditor* GetHTMLEditor(nsPresContext* aPresContext);
/**
* Check whether a spec feature/version is supported.
* @param aObject the object, which should support the feature,
* for example nsIDOMNode or nsIDOMDOMImplementation
* @param aFeature the feature ("Views", "Core", "HTML", "Range" ...)
* @param aVersion the version ("1.0", "2.0", ...)
* @return whether the feature is supported or not
*/
static bool InternalIsSupported(nsISupports* aObject,
const nsAString& aFeature,
const nsAString& aVersion);
/**
* Return true if the browser.dom.window.dump.enabled pref is set.
*/
static bool DOMWindowDumpEnabled();
/**
* Returns whether a content is an insertion point for XBL
* bindings or web components ShadowRoot. In web components,
* this corresponds to a <content> element that participates
* in node distribution. In XBL this corresponds to an
* <xbl:children> element in anonymous content.
*
* @param aContent The content to test for being an insertion point.
*/
static bool IsContentInsertionPoint(const nsIContent* aContent);
/**
* Returns whether the children of the provided content are
* nodes that are distributed to Shadow DOM insertion points.
*/
static bool HasDistributedChildren(nsIContent* aContent);
/**
* Returns whether a given header is forbidden for an XHR or fetch
* request.
*/
static bool IsForbiddenRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given header is forbidden for a system XHR
* request.
*/
static bool IsForbiddenSystemRequestHeader(const nsACString& aHeader);
/**
* Returns whether a given Content-Type header value is allowed
* for a non-CORS XHR or fetch request.
*/
static bool IsAllowedNonCorsContentType(const nsACString& aHeaderValue);
/**
* Returns whether a given header is forbidden for an XHR or fetch
* response.
*/
static bool IsForbiddenResponseHeader(const nsACString& aHeader);
/**
* Returns the inner window ID for the window associated with a request,
*/
static uint64_t GetInnerWindowID(nsIRequest* aRequest);
/**
* If the hostname for aURI is an IPv6 it encloses it in brackets,
* otherwise it just outputs the hostname in aHost.
*/
static void GetHostOrIPv6WithBrackets(nsIURI* aURI, nsAString& aHost);
static void GetHostOrIPv6WithBrackets(nsIURI* aURI, nsCString& aHost);
/*
* Call the given callback on all remote children of the given top-level
* window.
*/
static void CallOnAllRemoteChildren(nsIDOMWindow* aWindow,
CallOnRemoteChildFunction aCallback,
void* aArg);
static void TransferablesToIPCTransferables(nsISupportsArray* aTransferables,
nsTArray<mozilla::dom::IPCDataTransfer>& aIPC,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
static void TransferableToIPCTransferable(nsITransferable* aTransferable,
mozilla::dom::IPCDataTransfer* aIPCDataTransfer,
mozilla::dom::nsIContentChild* aChild,
mozilla::dom::nsIContentParent* aParent);
/*
* 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.
*/
static mozilla::UniquePtr<char[]> GetSurfaceData(mozilla::gfx::DataSourceSurface* aSurface,
size_t* aLength, int32_t* aStride);
// Helpers shared by the implementations of nsContentUtils methods and
// nsIDOMWindowUtils methods.
static mozilla::Modifiers GetWidgetModifiers(int32_t aModifiers);
static nsIWidget* GetWidget(nsIPresShell* aPresShell, nsPoint* aOffset);
static int16_t GetButtonsFlagForButton(int32_t aButton);
static mozilla::LayoutDeviceIntPoint ToWidgetPoint(const mozilla::CSSPoint& aPoint,
const nsPoint& aOffset,
nsPresContext* aPresContext);
static nsView* GetViewToDispatchEvent(nsPresContext* aPresContext,
nsIPresShell** aPresShell);
/**
* Synthesize a key event to the given widget
* (see nsIDOMWindowUtils.sendKeyEvent).
*/
static nsresult SendKeyEvent(nsIWidget* aWidget,
const nsAString& aType,
int32_t aKeyCode,
int32_t aCharCode,
int32_t aModifiers,
uint32_t aAdditionalFlags,
bool* aDefaultActionTaken);
/**
* Synthesize a mouse event to the given widget
* (see nsIDOMWindowUtils.sendMouseEvent).
*/
static nsresult SendMouseEvent(nsCOMPtr<nsIPresShell> aPresShell,
const nsAString& aType,
float aX,
float aY,
int32_t aButton,
int32_t aClickCount,
int32_t aModifiers,
bool aIgnoreRootScrollFrame,
float aPressure,
unsigned short aInputSourceArg,
bool aToWindow,
bool *aPreventDefault,
bool aIsSynthesized);
static void FirePageShowEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler,
bool aFireIfShowing);
static void FirePageHideEvent(nsIDocShellTreeItem* aItem,
mozilla::dom::EventTarget* aChromeEventHandler);
static already_AddRefed<nsPIWindowRoot> GetWindowRoot(nsIDocument* aDoc);
/*
* Implements step 3.1 and 3.3 of the Determine request's Referrer algorithm
* from the Referrer Policy specification.
*
* The referrer policy of the document is applied by Necko when using
* channels.
*
* For documents representing an iframe srcdoc attribute, the document sets
* its own URI correctly, so this method simply uses the document's original
* or current URI as appropriate.
*
* aDoc may be null.
*
* https://w3c.github.io/webappsec/specs/referrer-policy/#determine-requests-referrer
*/
static nsresult SetFetchReferrerURIWithPolicy(nsIPrincipal* aPrincipal,
nsIDocument* aDoc,
nsIHttpChannel* aChannel);
static bool PushEnabled(JSContext* aCx, JSObject* aObj);
static bool IsNonSubresourceRequest(nsIChannel* aChannel);
static uint32_t CookiesBehavior()
{
return sCookiesBehavior;
}
// The order of these entries matters, as we use std::min for total ordering
// of permissions. Private Browsing is considered to be more limiting
// then session scoping
enum class StorageAccess {
// Don't allow access to the storage
eDeny = 0,
// Allow access to the storage, but only if it is secure to do so in a
// private browsing context.
ePrivateBrowsing = 1,
// Allow access to the storage, but only persist it for the current session
eSessionScoped = 2,
// Allow access to the storage
eAllow = 3,
};
/*
* Checks if storage for the given window is permitted by a combination of
* the user's preferences, and whether the window is a third-party iframe.
*
* This logic is intended to be shared between the different forms of
* persistent storage which are available to web pages. Cookies don't use
* this logic, and security logic related to them must be updated separately.
*/
static StorageAccess StorageAllowedForWindow(nsPIDOMWindow* aWindow);
/*
* Checks if storage for the given principal is permitted by the user's
* preferences. The caller is assumed to not be a third-party iframe.
* (if that is possible, the caller should use StorageAllowedForWindow)
*/
static StorageAccess StorageAllowedForPrincipal(nsIPrincipal* aPrincipal);
private:
static bool InitializeEventTable();
static nsresult EnsureStringBundle(PropertiesFile aFile);
static bool CanCallerAccess(nsIPrincipal* aSubjectPrincipal,
nsIPrincipal* aPrincipal);
static nsresult WrapNative(JSContext *cx, nsISupports *native,
nsWrapperCache *cache, const nsIID* aIID,
JS::MutableHandle<JS::Value> vp,
bool aAllowWrapping);
static nsresult DispatchEvent(nsIDocument* aDoc,
nsISupports* aTarget,
const nsAString& aEventName,
bool aCanBubble,
bool aCancelable,
bool aTrusted,
bool *aDefaultAction = nullptr,
bool aOnlyChromeDispatch = false);
static void InitializeModifierStrings();
static void DropFragmentParsers();
static bool MatchClassNames(nsIContent* aContent, int32_t aNamespaceID,
nsIAtom* aAtom, void* aData);
static void DestroyClassNameArray(void* aData);
static void* AllocClassMatchingInfo(nsINode* aRootNode,
const nsString* aClasses);
// Fills in aInfo with the tokens from the supplied autocomplete attribute.
static AutocompleteAttrState InternalSerializeAutocompleteAttribute(const nsAttrValue* aAttrVal,
mozilla::dom::AutocompleteInfo& aInfo);
static void CallOnAllRemoteChildren(nsIMessageBroadcaster* aManager,
CallOnRemoteChildFunction aCallback,
void* aArg);
/*
* Checks if storage for a given principal is permitted by the user's
* preferences. If aWindow is non-null, its principal must be passed as
* aPrincipal, and the third-party iframe and sandboxing status of the window
* are also checked.
*
* Used in the implementation of StorageAllowedForWindow and
* StorageAllowedForPrincipal.
*/
static StorageAccess InternalStorageAllowedForPrincipal(nsIPrincipal* aPrincipal,
nsPIDOMWindow* aWindow);
static nsIXPConnect *sXPConnect;
static nsIScriptSecurityManager *sSecurityManager;
static nsIPrincipal *sSystemPrincipal;
static nsIPrincipal *sNullSubjectPrincipal;
static nsIParserService *sParserService;
static nsNameSpaceManager *sNameSpaceManager;
static nsIIOService *sIOService;
static nsIUUIDGenerator *sUUIDGenerator;
static bool sImgLoaderInitialized;
static void InitImgLoader();
// The following four members are initialized lazily
static imgLoader* sImgLoader;
static imgLoader* sPrivateImgLoader;
static imgICache* sImgCache;
static imgICache* sPrivateImgCache;
static nsIConsoleService* sConsoleService;
static nsDataHashtable<nsISupportsHashKey, EventNameMapping>* sAtomEventTable;
static nsDataHashtable<nsStringHashKey, EventNameMapping>* sStringEventTable;
static nsCOMArray<nsIAtom>* sUserDefinedEvents;
static nsIStringBundleService* sStringBundleService;
static nsIStringBundle* sStringBundles[PropertiesFile_COUNT];
static nsIContentPolicy* sContentPolicyService;
static bool sTriedToGetContentPolicy;
static nsILineBreaker* sLineBreaker;
static nsIWordBreaker* sWordBreaker;
static nsIBidiKeyboard* sBidiKeyboard;
static bool sInitialized;
static uint32_t sScriptBlockerCount;
static uint32_t sDOMNodeRemovedSuppressCount;
static uint32_t sMicroTaskLevel;
// Not an nsCOMArray because removing elements from those is slower
static nsTArray< nsCOMPtr<nsIRunnable> >* sBlockedScriptRunners;
static uint32_t sRunnersCountAtFirstBlocker;
static uint32_t sScriptBlockerCountWhereRunnersPrevented;
static nsIInterfaceRequestor* sSameOriginChecker;
static bool sIsHandlingKeyBoardEvent;
static bool sAllowXULXBL_for_file;
static bool sIsFullScreenApiEnabled;
static bool sTrustedFullScreenOnly;
static bool sIsCutCopyAllowed;
static uint32_t sHandlingInputTimeout;
static bool sIsPerformanceTimingEnabled;
static bool sIsResourceTimingEnabled;
static bool sIsUserTimingLoggingEnabled;
static bool sIsFrameTimingPrefEnabled;
static bool sIsExperimentalAutocompleteEnabled;
static bool sEncodeDecodeURLHash;
static bool sGettersDecodeURLHash;
static bool sPrivacyResistFingerprinting;
static bool sSendPerformanceTimingNotifications;
static bool sSWInterceptionEnabled;
static uint32_t sCookiesLifetimePolicy;
static uint32_t sCookiesBehavior;
static nsHtml5StringParser* sHTMLFragmentParser;
static nsIParser* sXMLFragmentParser;
static nsIFragmentContentSink* sXMLFragmentSink;
/**
* True if there's a fragment parser activation on the stack.
*/
static bool sFragmentParsingActive;
static nsString* sShiftText;
static nsString* sControlText;
static nsString* sMetaText;
static nsString* sOSText;
static nsString* sAltText;
static nsString* sModifierSeparator;
#if !(defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP))
static bool sDOMWindowDumpEnabled;
#endif
};
class MOZ_RAII nsAutoScriptBlocker {
public:
explicit nsAutoScriptBlocker(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM) {
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
nsContentUtils::AddScriptBlocker();
}
~nsAutoScriptBlocker() {
nsContentUtils::RemoveScriptBlocker();
}
private:
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
class MOZ_STACK_CLASS nsAutoScriptBlockerSuppressNodeRemoved :
public nsAutoScriptBlocker {
public:
nsAutoScriptBlockerSuppressNodeRemoved() {
++nsContentUtils::sDOMNodeRemovedSuppressCount;
}
~nsAutoScriptBlockerSuppressNodeRemoved() {
--nsContentUtils::sDOMNodeRemovedSuppressCount;
}
};
class MOZ_STACK_CLASS nsAutoMicroTask
{
public:
nsAutoMicroTask()
{
nsContentUtils::EnterMicroTask();
}
~nsAutoMicroTask()
{
nsContentUtils::LeaveMicroTask();
}
};
namespace mozilla {
namespace dom {
class TreeOrderComparator {
public:
bool Equals(nsINode* aElem1, nsINode* aElem2) const {
return aElem1 == aElem2;
}
bool LessThan(nsINode* aElem1, nsINode* aElem2) const {
return nsContentUtils::PositionIsBefore(aElem1, aElem2);
}
};
} // namespace dom
} // namespace mozilla
#define NS_INTERFACE_MAP_ENTRY_TEAROFF(_interface, _allocator) \
if (aIID.Equals(NS_GET_IID(_interface))) { \
foundInterface = static_cast<_interface *>(_allocator); \
if (!foundInterface) { \
*aInstancePtr = nullptr; \
return NS_ERROR_OUT_OF_MEMORY; \
} \
} else
/*
* In the following helper macros we exploit the fact that the result of a
* series of additions will not be finite if any one of the operands in the
* series is not finite.
*/
#define NS_ENSURE_FINITE(f, rv) \
if (!mozilla::IsFinite(f)) { \
return (rv); \
}
#define NS_ENSURE_FINITE2(f1, f2, rv) \
if (!mozilla::IsFinite((f1)+(f2))) { \
return (rv); \
}
#define NS_ENSURE_FINITE4(f1, f2, f3, f4, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4))) { \
return (rv); \
}
#define NS_ENSURE_FINITE5(f1, f2, f3, f4, f5, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5))) { \
return (rv); \
}
#define NS_ENSURE_FINITE6(f1, f2, f3, f4, f5, f6, rv) \
if (!mozilla::IsFinite((f1)+(f2)+(f3)+(f4)+(f5)+(f6))) { \
return (rv); \
}
// Deletes a linked list iteratively to avoid blowing up the stack (bug 460444).
#define NS_CONTENT_DELETE_LIST_MEMBER(type_, ptr_, member_) \
{ \
type_ *cur = (ptr_)->member_; \
(ptr_)->member_ = nullptr; \
while (cur) { \
type_ *next = cur->member_; \
cur->member_ = nullptr; \
delete cur; \
cur = next; \
} \
}
#endif /* nsContentUtils_h___ */
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