gecko-dev/dom/xbl/nsXBLDocumentInfo.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et 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/. */
#include "mozilla/DebugOnly.h"
#include "nsXBLDocumentInfo.h"
#include "nsIDocument.h"
#include "nsXBLPrototypeBinding.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsIScriptContext.h"
#include "nsIDOMDocument.h"
#include "nsIDOMScriptObjectFactory.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "nsIURI.h"
#include "nsIConsoleService.h"
#include "nsIScriptError.h"
#include "nsIChromeRegistry.h"
#include "nsIPrincipal.h"
#include "nsJSPrincipals.h"
#include "nsIScriptSecurityManager.h"
#include "nsContentUtils.h"
#include "nsCxPusher.h"
#include "nsDOMJSUtils.h"
#include "mozilla/Services.h"
#include "xpcpublic.h"
#include "mozilla/scache/StartupCache.h"
#include "mozilla/scache/StartupCacheUtils.h"
#include "nsCCUncollectableMarker.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/URL.h"
using namespace mozilla;
using namespace mozilla::scache;
using namespace mozilla::dom;
static const char kXBLCachePrefix[] = "xblcache";
/* Implementation file */
static PLDHashOperator
TraverseProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
nsCycleCollectionTraversalCallback *cb =
static_cast<nsCycleCollectionTraversalCallback*>(aClosure);
aProto->Traverse(*cb);
return PL_DHASH_NEXT;
}
static PLDHashOperator
UnlinkProtoJSObjects(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
aProto->UnlinkJSObjects();
return PL_DHASH_NEXT;
}
struct ProtoTracer
{
const TraceCallbacks &mCallbacks;
void *mClosure;
};
static PLDHashOperator
TraceProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
ProtoTracer* closure = static_cast<ProtoTracer*>(aClosure);
aProto->Trace(closure->mCallbacks, closure->mClosure);
return PL_DHASH_NEXT;
}
NS_IMPL_CYCLE_COLLECTION_CLASS(nsXBLDocumentInfo)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsXBLDocumentInfo)
if (tmp->mBindingTable) {
tmp->mBindingTable->EnumerateRead(UnlinkProtoJSObjects, nullptr);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsXBLDocumentInfo)
if (tmp->mDocument &&
nsCCUncollectableMarker::InGeneration(cb, tmp->mDocument->GetMarkedCCGeneration())) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
return NS_SUCCESS_INTERRUPTED_TRAVERSE;
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
if (tmp->mBindingTable) {
tmp->mBindingTable->EnumerateRead(TraverseProtos, &cb);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsXBLDocumentInfo)
if (tmp->mBindingTable) {
ProtoTracer closure = { aCallbacks, aClosure };
tmp->mBindingTable->EnumerateRead(TraceProtos, &closure);
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
static void
UnmarkXBLJSObject(void* aP, const char* aName, void* aClosure)
{
JS::ExposeObjectToActiveJS(static_cast<JSObject*>(aP));
}
static PLDHashOperator
UnmarkProtos(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
aProto->Trace(TraceCallbackFunc(UnmarkXBLJSObject), nullptr);
return PL_DHASH_NEXT;
}
void
nsXBLDocumentInfo::MarkInCCGeneration(uint32_t aGeneration)
{
if (mDocument) {
mDocument->MarkUncollectableForCCGeneration(aGeneration);
}
// Unmark any JS we hold
if (mBindingTable) {
mBindingTable->EnumerateRead(UnmarkProtos, nullptr);
}
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsXBLDocumentInfo)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsXBLDocumentInfo)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsXBLDocumentInfo)
nsXBLDocumentInfo::nsXBLDocumentInfo(nsIDocument* aDocument)
: mDocument(aDocument),
mScriptAccess(true),
mIsChrome(false),
mFirstBinding(nullptr)
{
nsIURI* uri = aDocument->GetDocumentURI();
if (IsChromeURI(uri)) {
// Cache whether or not this chrome XBL can execute scripts.
nsCOMPtr<nsIXULChromeRegistry> reg =
mozilla::services::GetXULChromeRegistryService();
if (reg) {
bool allow = true;
reg->AllowScriptsForPackage(uri, &allow);
mScriptAccess = allow;
}
mIsChrome = true;
} else {
// If this binding isn't running with system principal, then it's running
// from a remote-XUL whitelisted domain. This is already a not-really-
// supported configuration (among other things, we don't use XBL scopes in
// that configuration for compatibility reasons). But we should still at
// least make an effort to prevent binding code from running if content
// script is disabled or if the source domain is blacklisted (since the
// source domain for remote XBL must always be the same as the source domain
// of the bound content).
//
// If we just ask the binding document if script is enabled, it will
// discover that it has no inner window, and return false. So instead, we
// short-circuit the normal compartment-managed script-disabling machinery,
// and query the policy for the URI directly.
bool allow;
nsIScriptSecurityManager* ssm = nsContentUtils::GetSecurityManager();
nsresult rv = ssm->PolicyAllowsScript(uri, &allow);
mScriptAccess = NS_SUCCEEDED(rv) && allow;
}
}
nsXBLDocumentInfo::~nsXBLDocumentInfo()
{
mozilla::DropJSObjects(this);
}
nsXBLPrototypeBinding*
nsXBLDocumentInfo::GetPrototypeBinding(const nsACString& aRef)
{
if (!mBindingTable)
return nullptr;
if (aRef.IsEmpty()) {
// Return our first binding
return mFirstBinding;
}
return mBindingTable->Get(aRef);
}
nsresult
nsXBLDocumentInfo::SetPrototypeBinding(const nsACString& aRef, nsXBLPrototypeBinding* aBinding)
{
if (!mBindingTable) {
mBindingTable = new nsClassHashtable<nsCStringHashKey, nsXBLPrototypeBinding>();
mozilla::HoldJSObjects(this);
}
NS_ENSURE_STATE(!mBindingTable->Get(aRef));
mBindingTable->Put(aRef, aBinding);
return NS_OK;
}
void
nsXBLDocumentInfo::RemovePrototypeBinding(const nsACString& aRef)
{
if (mBindingTable) {
nsAutoPtr<nsXBLPrototypeBinding> bindingToRemove;
mBindingTable->RemoveAndForget(aRef, bindingToRemove);
// We do not want to destroy the binding, so just forget it.
bindingToRemove.forget();
}
}
// Callback to enumerate over the bindings from this document and write them
// out to the cache.
static PLDHashOperator
WriteBinding(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
aProto->Write((nsIObjectOutputStream*)aClosure);
return PL_DHASH_NEXT;
}
// static
nsresult
nsXBLDocumentInfo::ReadPrototypeBindings(nsIURI* aURI, nsXBLDocumentInfo** aDocInfo)
{
*aDocInfo = nullptr;
nsAutoCString spec(kXBLCachePrefix);
nsresult rv = PathifyURI(aURI, spec);
NS_ENSURE_SUCCESS(rv, rv);
StartupCache* startupCache = StartupCache::GetSingleton();
NS_ENSURE_TRUE(startupCache, NS_ERROR_FAILURE);
nsAutoArrayPtr<char> buf;
uint32_t len;
rv = startupCache->GetBuffer(spec.get(), getter_Transfers(buf), &len);
// GetBuffer will fail if the binding is not in the cache.
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsIObjectInputStream> stream;
rv = NewObjectInputStreamFromBuffer(buf, len, getter_AddRefs(stream));
NS_ENSURE_SUCCESS(rv, rv);
buf.forget();
// The file compatibility.ini stores the build id. This is checked in
// nsAppRunner.cpp and will delete the cache if a different build is
// present. However, we check that the version matches here to be safe.
uint32_t version;
rv = stream->Read32(&version);
NS_ENSURE_SUCCESS(rv, rv);
if (version != XBLBinding_Serialize_Version) {
// The version that exists is different than expected, likely created with a
// different build, so invalidate the cache.
startupCache->InvalidateCache();
return NS_ERROR_NOT_AVAILABLE;
}
nsCOMPtr<nsIPrincipal> principal;
nsContentUtils::GetSecurityManager()->
GetSystemPrincipal(getter_AddRefs(principal));
nsCOMPtr<nsIDOMDocument> domdoc;
rv = NS_NewXBLDocument(getter_AddRefs(domdoc), aURI, nullptr, principal);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDocument> doc = do_QueryInterface(domdoc);
NS_ASSERTION(doc, "Must have a document!");
nsRefPtr<nsXBLDocumentInfo> docInfo = new nsXBLDocumentInfo(doc);
while (1) {
uint8_t flags;
nsresult rv = stream->Read8(&flags);
NS_ENSURE_SUCCESS(rv, rv);
if (flags == XBLBinding_Serialize_NoMoreBindings)
break;
rv = nsXBLPrototypeBinding::ReadNewBinding(stream, docInfo, doc, flags);
if (NS_FAILED(rv)) {
return rv;
}
}
docInfo.swap(*aDocInfo);
return NS_OK;
}
nsresult
nsXBLDocumentInfo::WritePrototypeBindings()
{
// Only write out bindings with the system principal
if (!nsContentUtils::IsSystemPrincipal(mDocument->NodePrincipal()))
return NS_OK;
nsAutoCString spec(kXBLCachePrefix);
nsresult rv = PathifyURI(DocumentURI(), spec);
NS_ENSURE_SUCCESS(rv, rv);
StartupCache* startupCache = StartupCache::GetSingleton();
NS_ENSURE_TRUE(startupCache, rv);
nsCOMPtr<nsIObjectOutputStream> stream;
nsCOMPtr<nsIStorageStream> storageStream;
rv = NewObjectOutputWrappedStorageStream(getter_AddRefs(stream),
getter_AddRefs(storageStream),
true);
NS_ENSURE_SUCCESS(rv, rv);
rv = stream->Write32(XBLBinding_Serialize_Version);
NS_ENSURE_SUCCESS(rv, rv);
if (mBindingTable) {
mBindingTable->EnumerateRead(WriteBinding, stream);
}
// write a end marker at the end
rv = stream->Write8(XBLBinding_Serialize_NoMoreBindings);
NS_ENSURE_SUCCESS(rv, rv);
stream->Close();
NS_ENSURE_SUCCESS(rv, rv);
uint32_t len;
nsAutoArrayPtr<char> buf;
rv = NewBufferFromStorageStream(storageStream, getter_Transfers(buf), &len);
NS_ENSURE_SUCCESS(rv, rv);
return startupCache->PutBuffer(spec.get(), buf, len);
}
void
nsXBLDocumentInfo::SetFirstPrototypeBinding(nsXBLPrototypeBinding* aBinding)
{
mFirstBinding = aBinding;
}
static PLDHashOperator
FlushScopedSkinSheets(const nsACString &aKey, nsXBLPrototypeBinding *aProto, void* aClosure)
{
aProto->FlushSkinSheets();
return PL_DHASH_NEXT;
}
void
nsXBLDocumentInfo::FlushSkinStylesheets()
{
if (mBindingTable) {
mBindingTable->EnumerateRead(FlushScopedSkinSheets, nullptr);
}
}
#ifdef DEBUG
void
AssertInCompilationScope()
{
AutoJSContext cx;
// Note - Inverting the order of these operands is a rooting hazard.
MOZ_ASSERT(xpc::GetCompilationScope() == JS::CurrentGlobalOrNull(cx));
}
#endif