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gecko-dev/docshell/base/BrowsingContext.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/BrowsingContext.h"
#include "ipc/IPCMessageUtils.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/BrowsingContextGroup.h"
#include "mozilla/dom/BrowsingContextBinding.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Location.h"
#include "mozilla/dom/LocationBinding.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/WindowBinding.h"
#include "mozilla/dom/WindowGlobalChild.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "mozilla/dom/WindowProxyHolder.h"
#include "mozilla/Assertions.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/HashTable.h"
#include "mozilla/Logging.h"
#include "mozilla/StaticPtr.h"
#include "nsDocShell.h"
#include "nsGlobalWindowOuter.h"
#include "nsContentUtils.h"
#include "nsScriptError.h"
#include "nsThreadUtils.h"
#include "xpcprivate.h"
#include "AutoplayPolicy.h"
extern mozilla::LazyLogModule gAutoplayPermissionLog;
#define AUTOPLAY_LOG(msg, ...) \
MOZ_LOG(gAutoplayPermissionLog, LogLevel::Debug, (msg, ##__VA_ARGS__))
namespace mozilla {
namespace dom {
extern mozilla::LazyLogModule gUserInteractionPRLog;
#define USER_ACTIVATION_LOG(msg, ...) \
MOZ_LOG(gUserInteractionPRLog, LogLevel::Debug, (msg, ##__VA_ARGS__))
static LazyLogModule gBrowsingContextLog("BrowsingContext");
typedef nsDataHashtable<nsUint64HashKey, BrowsingContext*> BrowsingContextMap;
static StaticAutoPtr<BrowsingContextMap> sBrowsingContexts;
static void Register(BrowsingContext* aBrowsingContext) {
sBrowsingContexts->Put(aBrowsingContext->Id(), aBrowsingContext);
aBrowsingContext->Group()->Register(aBrowsingContext);
}
void BrowsingContext::Unregister() {
MOZ_DIAGNOSTIC_ASSERT(mGroup);
mGroup->Unregister(this);
mIsDiscarded = true;
// NOTE: Doesn't use SetClosed, as it will be set in all processes
// automatically by calls to Detach()
mClosed = true;
}
BrowsingContext* BrowsingContext::Top() {
BrowsingContext* bc = this;
while (bc->mParent) {
bc = bc->mParent;
}
return bc;
}
/* static */
void BrowsingContext::Init() {
if (!sBrowsingContexts) {
sBrowsingContexts = new BrowsingContextMap();
ClearOnShutdown(&sBrowsingContexts);
}
}
/* static */
LogModule* BrowsingContext::GetLog() { return gBrowsingContextLog; }
/* static */
already_AddRefed<BrowsingContext> BrowsingContext::Get(uint64_t aId) {
return do_AddRef(sBrowsingContexts->Get(aId));
}
/* static */
already_AddRefed<BrowsingContext> BrowsingContext::GetFromWindow(
WindowProxyHolder& aProxy) {
return do_AddRef(aProxy.get());
}
CanonicalBrowsingContext* BrowsingContext::Canonical() {
return CanonicalBrowsingContext::Cast(this);
}
/* static */
already_AddRefed<BrowsingContext> BrowsingContext::Create(
BrowsingContext* aParent, BrowsingContext* aOpener, const nsAString& aName,
Type aType) {
MOZ_DIAGNOSTIC_ASSERT(!aParent || aParent->mType == aType);
uint64_t id = nsContentUtils::GenerateBrowsingContextId();
MOZ_LOG(GetLog(), LogLevel::Debug,
("Creating 0x%08" PRIx64 " in %s", id,
XRE_IsParentProcess() ? "Parent" : "Child"));
// Determine which BrowsingContextGroup this context should be created in.
RefPtr<BrowsingContextGroup> group =
BrowsingContextGroup::Select(aParent, aOpener);
RefPtr<BrowsingContext> context;
if (XRE_IsParentProcess()) {
context = new CanonicalBrowsingContext(aParent, group, id,
/* aProcessId */ 0, aType);
} else {
context = new BrowsingContext(aParent, group, id, aType);
}
// The name and opener fields need to be explicitly initialized. Don't bother
// using transactions to set them, as we haven't been attached yet.
context->mName = aName;
context->mOpenerId = aOpener ? aOpener->Id() : 0;
context->mEmbedderPolicy = nsILoadInfo::EMBEDDER_POLICY_NULL;
BrowsingContext* inherit = aParent ? aParent : aOpener;
if (inherit) {
context->mOpenerPolicy = inherit->mOpenerPolicy;
// CORPP 3.1.3 https://mikewest.github.io/corpp/#integration-html
context->mEmbedderPolicy = inherit->mEmbedderPolicy;
}
Register(context);
// Attach the browsing context to the tree.
context->Attach();
return context.forget();
}
/* static */
already_AddRefed<BrowsingContext> BrowsingContext::CreateFromIPC(
BrowsingContext::IPCInitializer&& aInit, BrowsingContextGroup* aGroup,
ContentParent* aOriginProcess) {
MOZ_DIAGNOSTIC_ASSERT(aOriginProcess || XRE_IsContentProcess());
MOZ_DIAGNOSTIC_ASSERT(aGroup);
uint64_t originId = 0;
if (aOriginProcess) {
originId = aOriginProcess->ChildID();
aGroup->EnsureSubscribed(aOriginProcess);
}
MOZ_LOG(GetLog(), LogLevel::Debug,
("Creating 0x%08" PRIx64 " from IPC (origin=0x%08" PRIx64 ")",
aInit.mId, originId));
RefPtr<BrowsingContext> parent = aInit.GetParent();
RefPtr<BrowsingContext> context;
if (XRE_IsParentProcess()) {
context = new CanonicalBrowsingContext(parent, aGroup, aInit.mId, originId,
Type::Content);
} else {
context = new BrowsingContext(parent, aGroup, aInit.mId, Type::Content);
}
Register(context);
// Initialize all of our fields from IPC. We don't have to worry about
// mOpenerId, as we won't try to dereference it immediately.
#define MOZ_BC_FIELD(name, ...) context->m##name = aInit.m##name;
#include "mozilla/dom/BrowsingContextFieldList.h"
// Caller handles attaching us to the tree.
return context.forget();
}
BrowsingContext::BrowsingContext(BrowsingContext* aParent,
BrowsingContextGroup* aGroup,
uint64_t aBrowsingContextId, Type aType)
: mType(aType),
mBrowsingContextId(aBrowsingContextId),
mGroup(aGroup),
mParent(aParent),
mIsInProcess(false),
mIsDiscarded(false),
mDanglingRemoteOuterProxies(false) {
MOZ_RELEASE_ASSERT(!mParent || mParent->Group() == mGroup);
MOZ_RELEASE_ASSERT(mBrowsingContextId != 0);
MOZ_RELEASE_ASSERT(mGroup);
}
void BrowsingContext::SetDocShell(nsIDocShell* aDocShell) {
// XXX(nika): We should communicate that we are now an active BrowsingContext
// process to the parent & do other validation here.
MOZ_RELEASE_ASSERT(aDocShell->GetBrowsingContext() == this);
mDocShell = aDocShell;
mDanglingRemoteOuterProxies = !mIsInProcess;
mIsInProcess = true;
}
// This class implements a callback that will return the remote window proxy for
// mBrowsingContext in that compartment, if it has one. It also removes the
// proxy from the map, because the object will be transplanted into another kind
// of object.
class MOZ_STACK_CLASS CompartmentRemoteProxyTransplantCallback
: public js::CompartmentTransplantCallback {
public:
explicit CompartmentRemoteProxyTransplantCallback(
BrowsingContext* aBrowsingContext)
: mBrowsingContext(aBrowsingContext) {}
virtual JSObject* getObjectToTransplant(
JS::Compartment* compartment) override {
auto* priv = xpc::CompartmentPrivate::Get(compartment);
if (!priv) {
return nullptr;
}
auto& map = priv->GetRemoteProxyMap();
auto result = map.lookup(mBrowsingContext);
if (!result) {
return nullptr;
}
JSObject* resultObject = result->value();
map.remove(result);
return resultObject;
}
private:
BrowsingContext* mBrowsingContext;
};
void BrowsingContext::CleanUpDanglingRemoteOuterWindowProxies(
JSContext* aCx, JS::MutableHandle<JSObject*> aOuter) {
if (!mDanglingRemoteOuterProxies) {
return;
}
mDanglingRemoteOuterProxies = false;
CompartmentRemoteProxyTransplantCallback cb(this);
js::RemapRemoteWindowProxies(aCx, &cb, aOuter);
}
void BrowsingContext::SetEmbedderElement(Element* aEmbedder) {
// Notify the parent process of the embedding status. We don't need to do
// this when clearing our embedder, as we're being destroyed either way.
if (aEmbedder) {
nsCOMPtr<nsIDocShell> container =
do_QueryInterface(aEmbedder->OwnerDoc()->GetContainer());
// If our embedder element is being mutated to a different embedder, and we
// have a parent edge, bad things might be happening!
//
// XXX: This is a workaround to some parent edges not being immutable in the
// parent process. It can be fixed once bug 1539979 has been fixed.
if (mParent && mEmbedderElement && mEmbedderElement != aEmbedder) {
NS_WARNING("Non root content frameLoader swap! This will crash soon!");
MOZ_DIAGNOSTIC_ASSERT(mType == Type::Chrome, "must be chrome");
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess(), "must be in parent");
MOZ_DIAGNOSTIC_ASSERT(!mGroup->IsContextCached(this),
"cannot be in bfcache");
RefPtr<BrowsingContext> kungFuDeathGrip(this);
RefPtr<BrowsingContext> newParent(container->GetBrowsingContext());
mParent->mChildren.RemoveElement(this);
if (newParent) {
newParent->mChildren.AppendElement(this);
}
mParent = newParent;
}
nsCOMPtr<nsPIDOMWindowInner> inner =
do_QueryInterface(aEmbedder->GetOwnerGlobal());
if (inner) {
RefPtr<WindowGlobalChild> wgc = inner->GetWindowGlobalChild();
// If we're in-process, synchronously perform the update to ensure we
// don't get out of sync.
// XXX(nika): This is super gross, and I don't like it one bit.
if (RefPtr<WindowGlobalParent> wgp = wgc->GetParentActor()) {
Canonical()->SetEmbedderWindowGlobal(wgp);
} else {
wgc->SendDidEmbedBrowsingContext(this);
}
}
}
mEmbedderElement = aEmbedder;
}
void BrowsingContext::Attach(bool aFromIPC) {
MOZ_LOG(GetLog(), LogLevel::Debug,
("%s: Connecting 0x%08" PRIx64 " to 0x%08" PRIx64,
XRE_IsParentProcess() ? "Parent" : "Child", Id(),
mParent ? mParent->Id() : 0));
MOZ_DIAGNOSTIC_ASSERT(mGroup);
MOZ_DIAGNOSTIC_ASSERT(!mGroup->IsContextCached(this));
MOZ_DIAGNOSTIC_ASSERT(!mIsDiscarded);
auto* children = mParent ? &mParent->mChildren : &mGroup->Toplevels();
MOZ_DIAGNOSTIC_ASSERT(!children->Contains(this));
children->AppendElement(this);
if (!aFromIPC) {
// Send attach to our parent if we need to.
if (XRE_IsContentProcess()) {
ContentChild::GetSingleton()->SendAttachBrowsingContext(
GetIPCInitializer());
} else if (IsContent()) {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess());
mGroup->EachParent([&](ContentParent* aParent) {
Unused << aParent->SendAttachBrowsingContext(GetIPCInitializer());
});
}
}
}
void BrowsingContext::Detach(bool aFromIPC) {
MOZ_LOG(GetLog(), LogLevel::Debug,
("%s: Detaching 0x%08" PRIx64 " from 0x%08" PRIx64,
XRE_IsParentProcess() ? "Parent" : "Child", Id(),
mParent ? mParent->Id() : 0));
// Unlinking might remove our group before Detach gets called.
if (NS_WARN_IF(!mGroup)) {
return;
}
RefPtr<BrowsingContext> self(this);
if (!mGroup->EvictCachedContext(this)) {
Children* children = nullptr;
if (mParent) {
children = &mParent->mChildren;
} else {
children = &mGroup->Toplevels();
}
children->RemoveElement(this);
}
Unregister();
if (!aFromIPC && XRE_IsContentProcess()) {
auto cc = ContentChild::GetSingleton();
MOZ_DIAGNOSTIC_ASSERT(cc);
// Tell our parent that the BrowsingContext has been detached. A strong
// reference to this is held until the promise is resolved to ensure it
// doesn't die before the parent receives the message.
auto resolve = [self](bool) {};
auto reject = [self](mozilla::ipc::ResponseRejectReason) {};
cc->SendDetachBrowsingContext(Id(), resolve, reject);
}
}
void BrowsingContext::PrepareForProcessChange() {
MOZ_LOG(GetLog(), LogLevel::Debug,
("%s: Preparing 0x%08" PRIx64 " for a process change",
XRE_IsParentProcess() ? "Parent" : "Child", Id()));
MOZ_ASSERT(mIsInProcess, "Must currently be an in-process frame");
MOZ_ASSERT(!mIsDiscarded, "We're already closed?");
mIsInProcess = false;
// NOTE: For now, clear our nsDocShell reference, as we're primarily in a
// different process now. This may need to change in the future with
// Cross-Process BFCache.
mDocShell = nullptr;
if (!mWindowProxy) {
return;
}
// We have to go through mWindowProxy rather than calling GetDOMWindow() on
// mDocShell because the mDocshell reference gets cleared immediately after
// the window is closed.
nsGlobalWindowOuter::PrepareForProcessChange(mWindowProxy);
MOZ_ASSERT(!mWindowProxy);
}
void BrowsingContext::CacheChildren(bool aFromIPC) {
MOZ_LOG(GetLog(), LogLevel::Debug,
("%s: Caching children of 0x%08" PRIx64 "",
XRE_IsParentProcess() ? "Parent" : "Child", Id()));
mGroup->CacheContexts(mChildren);
mChildren.Clear();
if (!aFromIPC && XRE_IsContentProcess()) {
auto cc = ContentChild::GetSingleton();
MOZ_DIAGNOSTIC_ASSERT(cc);
cc->SendCacheBrowsingContextChildren(this);
}
}
void BrowsingContext::RestoreChildren(Children&& aChildren, bool aFromIPC) {
MOZ_LOG(GetLog(), LogLevel::Debug,
("%s: Restoring children of 0x%08" PRIx64 "",
XRE_IsParentProcess() ? "Parent" : "Child", Id()));
for (BrowsingContext* child : aChildren) {
MOZ_DIAGNOSTIC_ASSERT(child->GetParent() == this);
Unused << mGroup->EvictCachedContext(child);
}
mChildren.AppendElements(aChildren);
if (!aFromIPC && XRE_IsContentProcess()) {
auto cc = ContentChild::GetSingleton();
MOZ_DIAGNOSTIC_ASSERT(cc);
cc->SendRestoreBrowsingContextChildren(this, aChildren);
}
}
bool BrowsingContext::IsCached() { return mGroup->IsContextCached(this); }
bool BrowsingContext::IsTargetable() {
return !mClosed && !mIsDiscarded && !IsCached();
}
bool BrowsingContext::HasOpener() const {
return sBrowsingContexts->Contains(mOpenerId);
}
void BrowsingContext::GetChildren(Children& aChildren) {
MOZ_ALWAYS_TRUE(aChildren.AppendElements(mChildren));
}
// FindWithName follows the rules for choosing a browsing context,
// with the exception of sandboxing for iframes. The implementation
// for arbitrarily choosing between two browsing contexts with the
// same name is as follows:
//
// 1) The start browsing context, i.e. 'this'
// 2) Descendants in insertion order
// 3) The parent
// 4) Siblings and their children, both in insertion order
// 5) After this we iteratively follow the parent chain, repeating 3
// and 4 until
// 6) If there is no parent, consider all other top level browsing
// contexts and their children, both in insertion order
//
// See
// https://html.spec.whatwg.org/multipage/browsers.html#the-rules-for-choosing-a-browsing-context-given-a-browsing-context-name
BrowsingContext* BrowsingContext::FindWithName(
const nsAString& aName, BrowsingContext& aRequestingContext) {
BrowsingContext* found = nullptr;
if (aName.IsEmpty()) {
// You can't find a browsing context with an empty name.
found = nullptr;
} else if (aName.LowerCaseEqualsLiteral("_blank")) {
// Just return null. Caller must handle creating a new window with
// a blank name.
found = nullptr;
} else if (IsSpecialName(aName)) {
found = FindWithSpecialName(aName, aRequestingContext);
} else if (BrowsingContext* child =
FindWithNameInSubtree(aName, aRequestingContext)) {
found = child;
} else {
BrowsingContext* current = this;
do {
Children* siblings;
BrowsingContext* parent = current->mParent;
if (!parent) {
// We've reached the root of the tree, consider browsing
// contexts in the same browsing context group.
siblings = &mGroup->Toplevels();
} else if (parent->NameEquals(aName) &&
aRequestingContext.CanAccess(parent) &&
parent->IsTargetable()) {
found = parent;
break;
} else {
siblings = &parent->mChildren;
}
for (BrowsingContext* sibling : *siblings) {
if (sibling == current) {
continue;
}
if (BrowsingContext* relative =
sibling->FindWithNameInSubtree(aName, aRequestingContext)) {
found = relative;
// Breaks the outer loop
parent = nullptr;
break;
}
}
current = parent;
} while (current);
}
// Helpers should perform access control checks, which means that we
// only need to assert that we can access found.
MOZ_DIAGNOSTIC_ASSERT(!found || aRequestingContext.CanAccess(found));
return found;
}
BrowsingContext* BrowsingContext::FindChildWithName(
const nsAString& aName, BrowsingContext& aRequestingContext) {
if (aName.IsEmpty()) {
// You can't find a browsing context with the empty name.
return nullptr;
}
for (BrowsingContext* child : mChildren) {
if (child->NameEquals(aName) && aRequestingContext.CanAccess(child) &&
child->IsTargetable()) {
return child;
}
}
return nullptr;
}
/* static */
bool BrowsingContext::IsSpecialName(const nsAString& aName) {
return (aName.LowerCaseEqualsLiteral("_self") ||
aName.LowerCaseEqualsLiteral("_parent") ||
aName.LowerCaseEqualsLiteral("_top") ||
aName.LowerCaseEqualsLiteral("_blank"));
}
BrowsingContext* BrowsingContext::FindWithSpecialName(
const nsAString& aName, BrowsingContext& aRequestingContext) {
// TODO(farre): Neither BrowsingContext nor nsDocShell checks if the
// browsing context pointed to by a special name is active. Should
// it be? See Bug 1527913.
if (aName.LowerCaseEqualsLiteral("_self")) {
return this;
}
if (aName.LowerCaseEqualsLiteral("_parent")) {
if (mParent) {
return aRequestingContext.CanAccess(mParent) ? mParent.get() : nullptr;
}
return this;
}
if (aName.LowerCaseEqualsLiteral("_top")) {
BrowsingContext* top = Top();
return aRequestingContext.CanAccess(top) ? top : nullptr;
}
return nullptr;
}
BrowsingContext* BrowsingContext::FindWithNameInSubtree(
const nsAString& aName, BrowsingContext& aRequestingContext) {
MOZ_DIAGNOSTIC_ASSERT(!aName.IsEmpty());
if (NameEquals(aName) && aRequestingContext.CanAccess(this) &&
IsTargetable()) {
return this;
}
for (BrowsingContext* child : mChildren) {
if (BrowsingContext* found =
child->FindWithNameInSubtree(aName, aRequestingContext)) {
return found;
}
}
return nullptr;
}
// For historical context, see:
//
// Bug 13871: Prevent frameset spoofing
// Bug 103638: Targets with same name in different windows open in wrong
// window with javascript
// Bug 408052: Adopt "ancestor" frame navigation policy
// Bug 1570207: Refactor logic to rely on BrowsingContextGroups to enforce
// origin attribute isolation.
bool BrowsingContext::CanAccess(BrowsingContext* aTarget,
bool aConsiderOpener) {
MOZ_ASSERT(
mDocShell,
"CanAccess() may only be called in the process of the accessing window");
MOZ_ASSERT(aTarget, "Must have a target");
MOZ_DIAGNOSTIC_ASSERT(
Group() == aTarget->Group(),
"A BrowsingContext should never see a context from a different group");
// A frame can navigate itself and its own root.
if (aTarget == this || aTarget == Top()) {
return true;
}
// A frame can navigate any frame with a same-origin ancestor.
for (BrowsingContext* bc = aTarget; bc; bc = bc->GetParent()) {
if (bc->mDocShell && nsDocShell::ValidateOrigin(mDocShell, bc->mDocShell)) {
return true;
}
}
// If the target is a top-level document, a frame can navigate it if it can
// navigate its opener.
if (aConsiderOpener && !aTarget->GetParent()) {
if (RefPtr<BrowsingContext> opener = aTarget->GetOpener()) {
return CanAccess(opener, false);
}
}
return false;
}
BrowsingContext::~BrowsingContext() {
MOZ_DIAGNOSTIC_ASSERT(!mParent || !mParent->mChildren.Contains(this));
MOZ_DIAGNOSTIC_ASSERT(!mGroup || !mGroup->Toplevels().Contains(this));
MOZ_DIAGNOSTIC_ASSERT(!mGroup || !mGroup->IsContextCached(this));
if (sBrowsingContexts) {
sBrowsingContexts->Remove(Id());
}
}
nsISupports* BrowsingContext::GetParentObject() const {
return xpc::NativeGlobal(xpc::PrivilegedJunkScope());
}
JSObject* BrowsingContext::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return BrowsingContext_Binding::Wrap(aCx, this, aGivenProto);
}
bool BrowsingContext::WriteStructuredClone(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
StructuredCloneHolder* aHolder) {
return (JS_WriteUint32Pair(aWriter, SCTAG_DOM_BROWSING_CONTEXT, 0) &&
JS_WriteUint32Pair(aWriter, uint32_t(Id()), uint32_t(Id() >> 32)));
}
/* static */
JSObject* BrowsingContext::ReadStructuredClone(JSContext* aCx,
JSStructuredCloneReader* aReader,
StructuredCloneHolder* aHolder) {
uint32_t idLow = 0;
uint32_t idHigh = 0;
if (!JS_ReadUint32Pair(aReader, &idLow, &idHigh)) {
return nullptr;
}
uint64_t id = uint64_t(idHigh) << 32 | idLow;
// Note: Do this check after reading our ID data. Returning null will abort
// the decode operation anyway, but we should at least be as safe as possible.
if (NS_WARN_IF(!NS_IsMainThread())) {
MOZ_DIAGNOSTIC_ASSERT(false,
"We shouldn't be trying to decode a BrowsingContext "
"on a background thread.");
return nullptr;
}
JS::RootedValue val(aCx, JS::NullValue());
// We'll get rooting hazard errors from the RefPtr destructor if it isn't
// destroyed before we try to return a raw JSObject*, so create it in its own
// scope.
if (RefPtr<BrowsingContext> context = Get(id)) {
if (!GetOrCreateDOMReflector(aCx, context, &val) || !val.isObject()) {
return nullptr;
}
}
return val.toObjectOrNull();
}
void BrowsingContext::NotifyUserGestureActivation() {
// We would set the user gesture activation flag on the top level browsing
// context, which would automatically be sync to other top level browsing
// contexts which are in the different process.
RefPtr<BrowsingContext> topLevelBC = Top();
USER_ACTIVATION_LOG("Get top level browsing context 0x%08" PRIx64,
topLevelBC->Id());
topLevelBC->SetIsActivatedByUserGesture(true);
}
void BrowsingContext::NotifyResetUserGestureActivation() {
// We would reset the user gesture activation flag on the top level browsing
// context, which would automatically be sync to other top level browsing
// contexts which are in the different process.
RefPtr<BrowsingContext> topLevelBC = Top();
USER_ACTIVATION_LOG("Get top level browsing context 0x%08" PRIx64,
topLevelBC->Id());
topLevelBC->SetIsActivatedByUserGesture(false);
}
bool BrowsingContext::GetUserGestureActivation() {
RefPtr<BrowsingContext> topLevelBC = Top();
return topLevelBC->GetIsActivatedByUserGesture();
}
NS_IMPL_CYCLE_COLLECTION_CLASS(BrowsingContext)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(BrowsingContext)
if (sBrowsingContexts) {
sBrowsingContexts->Remove(tmp->Id());
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocShell, mChildren, mParent, mGroup,
mEmbedderElement)
if (XRE_IsParentProcess()) {
CanonicalBrowsingContext::Cast(tmp)->Unlink();
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(BrowsingContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocShell, mChildren, mParent, mGroup,
mEmbedderElement)
if (XRE_IsParentProcess()) {
CanonicalBrowsingContext::Cast(tmp)->Traverse(cb);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(BrowsingContext)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(BrowsingContext, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(BrowsingContext, Release)
class RemoteLocationProxy
: public RemoteObjectProxy<BrowsingContext::LocationProxy,
Location_Binding::sCrossOriginAttributes,
Location_Binding::sCrossOriginMethods> {
public:
typedef RemoteObjectProxy Base;
constexpr RemoteLocationProxy()
: RemoteObjectProxy(prototypes::id::Location) {}
void NoteChildren(JSObject* aProxy,
nsCycleCollectionTraversalCallback& aCb) const override {
auto location =
static_cast<BrowsingContext::LocationProxy*>(GetNative(aProxy));
CycleCollectionNoteChild(aCb, location->GetBrowsingContext(),
"js::GetObjectPrivate(obj)->GetBrowsingContext()");
}
};
static const RemoteLocationProxy sSingleton;
// Give RemoteLocationProxy 2 reserved slots, like the other wrappers,
// so JSObject::swap can swap it with CrossCompartmentWrappers without requiring
// malloc.
template <>
const JSClass RemoteLocationProxy::Base::sClass =
PROXY_CLASS_DEF("Proxy", JSCLASS_HAS_RESERVED_SLOTS(2));
void BrowsingContext::Location(JSContext* aCx,
JS::MutableHandle<JSObject*> aLocation,
ErrorResult& aError) {
aError.MightThrowJSException();
sSingleton.GetProxyObject(aCx, &mLocation, /* aTransplantTo = */ nullptr,
aLocation);
if (!aLocation) {
aError.StealExceptionFromJSContext(aCx);
}
}
void BrowsingContext::LoadURI(BrowsingContext* aAccessor,
nsDocShellLoadState* aLoadState) {
MOZ_DIAGNOSTIC_ASSERT(!IsDiscarded());
MOZ_DIAGNOSTIC_ASSERT(!aAccessor || !aAccessor->IsDiscarded());
if (mDocShell) {
mDocShell->LoadURI(aLoadState);
} else if (!aAccessor && XRE_IsParentProcess()) {
Unused << Canonical()->GetCurrentWindowGlobal()->SendLoadURIInChild(
aLoadState);
} else {
MOZ_DIAGNOSTIC_ASSERT(aAccessor);
MOZ_DIAGNOSTIC_ASSERT(aAccessor->Group() == Group());
nsCOMPtr<nsPIDOMWindowOuter> win(aAccessor->GetDOMWindow());
MOZ_DIAGNOSTIC_ASSERT(win);
if (WindowGlobalChild* wgc =
win->GetCurrentInnerWindow()->GetWindowGlobalChild()) {
wgc->SendLoadURI(this, aLoadState);
}
}
}
void BrowsingContext::Close(CallerType aCallerType, ErrorResult& aError) {
// FIXME We need to set mClosed, but only once we're sending the
// DOMWindowClose event (which happens in the process where the
// document for this browsing context is loaded).
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1516343.
if (ContentChild* cc = ContentChild::GetSingleton()) {
cc->SendWindowClose(this, aCallerType == CallerType::System);
} else if (ContentParent* cp = Canonical()->GetContentParent()) {
Unused << cp->SendWindowClose(this, aCallerType == CallerType::System);
}
}
void BrowsingContext::Focus(ErrorResult& aError) {
if (ContentChild* cc = ContentChild::GetSingleton()) {
cc->SendWindowFocus(this);
} else if (ContentParent* cp = Canonical()->GetContentParent()) {
Unused << cp->SendWindowFocus(this);
}
}
void BrowsingContext::Blur(ErrorResult& aError) {
if (ContentChild* cc = ContentChild::GetSingleton()) {
cc->SendWindowBlur(this);
} else if (ContentParent* cp = Canonical()->GetContentParent()) {
Unused << cp->SendWindowBlur(this);
}
}
Nullable<WindowProxyHolder> BrowsingContext::GetTop(ErrorResult& aError) {
if (mIsDiscarded) {
return nullptr;
}
// We never return null or throw an error, but the implementation in
// nsGlobalWindow does and we need to use the same signature.
return WindowProxyHolder(Top());
}
void BrowsingContext::GetOpener(JSContext* aCx,
JS::MutableHandle<JS::Value> aOpener,
ErrorResult& aError) const {
RefPtr<BrowsingContext> opener = GetOpener();
if (!opener) {
aOpener.setNull();
return;
}
if (!ToJSValue(aCx, WindowProxyHolder(opener), aOpener)) {
aError.NoteJSContextException(aCx);
}
}
Nullable<WindowProxyHolder> BrowsingContext::GetParent(ErrorResult& aError) {
if (mIsDiscarded) {
return nullptr;
}
// We never throw an error, but the implementation in nsGlobalWindow does and
// we need to use the same signature.
if (!mParent) {
return WindowProxyHolder(this);
}
return WindowProxyHolder(mParent.get());
}
void BrowsingContext::PostMessageMoz(JSContext* aCx,
JS::Handle<JS::Value> aMessage,
const nsAString& aTargetOrigin,
const Sequence<JSObject*>& aTransfer,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aError) {
RefPtr<BrowsingContext> sourceBc;
PostMessageData data;
data.targetOrigin() = aTargetOrigin;
data.subjectPrincipal() = &aSubjectPrincipal;
RefPtr<nsGlobalWindowInner> callerInnerWindow;
if (!nsGlobalWindowOuter::GatherPostMessageData(
aCx, aTargetOrigin, getter_AddRefs(sourceBc), data.origin(),
getter_AddRefs(data.targetOriginURI()),
getter_AddRefs(data.callerPrincipal()),
getter_AddRefs(callerInnerWindow),
getter_AddRefs(data.callerDocumentURI()), aError)) {
return;
}
data.source() = sourceBc;
data.isFromPrivateWindow() =
callerInnerWindow &&
nsScriptErrorBase::ComputeIsFromPrivateWindow(callerInnerWindow);
JS::Rooted<JS::Value> transferArray(aCx);
aError = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransfer,
&transferArray);
if (NS_WARN_IF(aError.Failed())) {
return;
}
ipc::StructuredCloneData message;
message.Write(aCx, aMessage, transferArray, aError);
if (NS_WARN_IF(aError.Failed())) {
return;
}
ClonedMessageData messageData;
if (ContentChild* cc = ContentChild::GetSingleton()) {
if (!message.BuildClonedMessageDataForChild(cc, messageData)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
cc->SendWindowPostMessage(this, messageData, data);
} else if (ContentParent* cp = Canonical()->GetContentParent()) {
if (!message.BuildClonedMessageDataForParent(cp, messageData)) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
Unused << cp->SendWindowPostMessage(this, messageData, data);
}
}
void BrowsingContext::PostMessageMoz(JSContext* aCx,
JS::Handle<JS::Value> aMessage,
const WindowPostMessageOptions& aOptions,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aError) {
PostMessageMoz(aCx, aMessage, aOptions.mTargetOrigin, aOptions.mTransfer,
aSubjectPrincipal, aError);
}
void BrowsingContext::Transaction::Commit(BrowsingContext* aBrowsingContext) {
if (!Validate(aBrowsingContext, nullptr)) {
MOZ_CRASH("Cannot commit invalid BrowsingContext transaction");
}
if (XRE_IsContentProcess()) {
ContentChild* cc = ContentChild::GetSingleton();
// Increment the field epoch for fields affected by this transaction. We
// only need to do this in content.
uint64_t epoch = cc->NextBrowsingContextFieldEpoch();
#define MOZ_BC_FIELD(name, ...) \
if (m##name) { \
aBrowsingContext->mEpochs.name = epoch; \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
cc->SendCommitBrowsingContextTransaction(aBrowsingContext, *this, epoch);
} else {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess());
aBrowsingContext->Group()->EachParent([&](ContentParent* aParent) {
Unused << aParent->SendCommitBrowsingContextTransaction(
aBrowsingContext, *this, aParent->GetBrowsingContextFieldEpoch());
});
}
Apply(aBrowsingContext);
}
bool BrowsingContext::Transaction::Validate(BrowsingContext* aBrowsingContext,
ContentParent* aSource) {
#define MOZ_BC_FIELD(name, ...) \
if (m##name && !aBrowsingContext->MaySet##name(*m##name, aSource)) { \
NS_WARNING("Invalid attempt to set BC field " #name); \
return false; \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
mValidated = true;
return true;
}
bool BrowsingContext::Transaction::Validate(BrowsingContext* aBrowsingContext,
ContentParent* aSource,
uint64_t aEpoch) {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsContentProcess(),
"Should only be called in content process");
// Clear fields which are obsoleted by the epoch.
#define MOZ_BC_FIELD(name, ...) \
if (m##name && aBrowsingContext->mEpochs.name > aEpoch) { \
m##name.reset(); \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
return Validate(aBrowsingContext, aSource);
}
void BrowsingContext::Transaction::Apply(BrowsingContext* aBrowsingContext) {
MOZ_RELEASE_ASSERT(mValidated,
"Must validate BrowsingContext Transaction before Apply");
#define MOZ_BC_FIELD(name, ...) \
if (m##name) { \
aBrowsingContext->m##name = std::move(*m##name); \
aBrowsingContext->DidSet##name(); \
m##name.reset(); \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
}
BrowsingContext::IPCInitializer BrowsingContext::GetIPCInitializer() {
// FIXME: We should assert that we're loaded in-content here. (bug 1553804)
IPCInitializer init;
init.mId = Id();
init.mParentId = mParent ? mParent->Id() : 0;
init.mCached = IsCached();
#define MOZ_BC_FIELD(name, type) init.m##name = m##name;
#include "mozilla/dom/BrowsingContextFieldList.h"
return init;
}
already_AddRefed<BrowsingContext> BrowsingContext::IPCInitializer::GetParent() {
RefPtr<BrowsingContext> parent;
if (mParentId != 0) {
parent = BrowsingContext::Get(mParentId);
MOZ_RELEASE_ASSERT(parent);
}
return parent.forget();
}
already_AddRefed<BrowsingContext> BrowsingContext::IPCInitializer::GetOpener() {
RefPtr<BrowsingContext> opener;
if (mOpenerId != 0) {
opener = BrowsingContext::Get(mOpenerId);
MOZ_RELEASE_ASSERT(opener);
}
return opener.forget();
}
void BrowsingContext::LocationProxy::SetHref(const nsAString& aHref,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aError) {
nsPIDOMWindowOuter* win = GetBrowsingContext()->GetDOMWindow();
if (!win || !win->GetLocation()) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
win->GetLocation()->SetHref(aHref, aSubjectPrincipal, aError);
}
void BrowsingContext::LocationProxy::Replace(const nsAString& aUrl,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aError) {
nsPIDOMWindowOuter* win = GetBrowsingContext()->GetDOMWindow();
if (!win || !win->GetLocation()) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
win->GetLocation()->Replace(aUrl, aSubjectPrincipal, aError);
}
void BrowsingContext::StartDelayedAutoplayMediaComponents() {
if (!mDocShell) {
return;
}
AUTOPLAY_LOG("%s : StartDelayedAutoplayMediaComponents for bc 0x%08" PRIx64,
XRE_IsParentProcess() ? "Parent" : "Child", Id());
mDocShell->StartDelayedAutoplayMediaComponents();
}
void BrowsingContext::DidSetIsActivatedByUserGesture() {
MOZ_ASSERT(!mParent, "Set user activation flag on non top-level context!");
USER_ACTIVATION_LOG(
"Set user gesture activation %d for %s browsing context 0x%08" PRIx64,
mIsActivatedByUserGesture, XRE_IsParentProcess() ? "Parent" : "Child",
Id());
}
void BrowsingContext::DidSetMuted() {
MOZ_ASSERT(!mParent, "Set muted flag on non top-level context!");
USER_ACTIVATION_LOG("Set audio muted %d for %s browsing context 0x%08" PRIx64,
mMuted, XRE_IsParentProcess() ? "Parent" : "Child", Id());
PreOrderWalk([&](BrowsingContext* aContext) {
nsPIDOMWindowOuter* win = aContext->GetDOMWindow();
if (win) {
win->RefreshMediaElementsVolume();
}
});
}
} // namespace dom
namespace ipc {
void IPDLParamTraits<dom::BrowsingContext*>::Write(
IPC::Message* aMsg, IProtocol* aActor, dom::BrowsingContext* aParam) {
uint64_t id = aParam ? aParam->Id() : 0;
WriteIPDLParam(aMsg, aActor, id);
if (!aParam) {
return;
}
// Make sure that the other side will still have our BrowsingContext around
// when it tries to perform deserialization.
if (aActor->GetIPCChannel()->IsCrossProcess()) {
// If we're sending the message between processes, we only know the other
// side will still have a copy if we've not been discarded yet. As
// serialization cannot fail softly, fail loudly by crashing.
MOZ_RELEASE_ASSERT(
!aParam->IsDiscarded(),
"Cannot send discarded BrowsingContext between processes!");
} else {
// If we're in-process, we can take an extra reference to ensure it lives
// long enough to make it to the other side. This reference is freed in
// `::Read()`.
aParam->AddRef();
}
}
bool IPDLParamTraits<dom::BrowsingContext*>::Read(
const IPC::Message* aMsg, PickleIterator* aIter, IProtocol* aActor,
RefPtr<dom::BrowsingContext>* aResult) {
uint64_t id = 0;
if (!ReadIPDLParam(aMsg, aIter, aActor, &id)) {
return false;
}
if (id == 0) {
*aResult = nullptr;
return true;
}
RefPtr<dom::BrowsingContext> browsingContext = dom::BrowsingContext::Get(id);
if (!browsingContext) {
// NOTE: We could fail softly by returning `false` if the `BrowsingContext`
// isn't present, but doing so will cause a crash anyway. Let's improve
// diagnostics by reliably crashing here.
//
// If we can recover from failures to deserialize in the future, this crash
// should be removed or modified.
MOZ_CRASH("Attempt to deserialize absent BrowsingContext");
*aResult = nullptr;
return false;
}
if (!aActor->GetIPCChannel()->IsCrossProcess()) {
// Release the reference taken in `::Write()` for in-process actors.
browsingContext.get()->Release();
}
*aResult = browsingContext.forget();
return true;
}
void IPDLParamTraits<dom::BrowsingContext::Transaction>::Write(
IPC::Message* aMessage, IProtocol* aActor,
const dom::BrowsingContext::Transaction& aTransaction) {
MOZ_RELEASE_ASSERT(
aTransaction.mValidated,
"Must validate BrowsingContext Transaction before sending");
#define MOZ_BC_FIELD(name, ...) \
WriteIPDLParam(aMessage, aActor, aTransaction.m##name);
#include "mozilla/dom/BrowsingContextFieldList.h"
}
bool IPDLParamTraits<dom::BrowsingContext::Transaction>::Read(
const IPC::Message* aMessage, PickleIterator* aIterator, IProtocol* aActor,
dom::BrowsingContext::Transaction* aTransaction) {
aTransaction->mValidated = false;
#define MOZ_BC_FIELD(name, ...) \
if (!ReadIPDLParam(aMessage, aIterator, aActor, &aTransaction->m##name)) { \
return false; \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
return true;
}
void IPDLParamTraits<dom::BrowsingContext::IPCInitializer>::Write(
IPC::Message* aMessage, IProtocol* aActor,
const dom::BrowsingContext::IPCInitializer& aInit) {
// Write actor ID parameters.
WriteIPDLParam(aMessage, aActor, aInit.mId);
WriteIPDLParam(aMessage, aActor, aInit.mParentId);
WriteIPDLParam(aMessage, aActor, aInit.mCached);
// Write other synchronized fields.
#define MOZ_BC_FIELD(name, ...) WriteIPDLParam(aMessage, aActor, aInit.m##name);
#include "mozilla/dom/BrowsingContextFieldList.h"
}
bool IPDLParamTraits<dom::BrowsingContext::IPCInitializer>::Read(
const IPC::Message* aMessage, PickleIterator* aIterator, IProtocol* aActor,
dom::BrowsingContext::IPCInitializer* aInit) {
// Read actor ID parameters.
if (!ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mId) ||
!ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mParentId)) {
return false;
}
if (!ReadIPDLParam(aMessage, aIterator, aActor, &aInit->mCached)) {
return false;
}
// Read other synchronized fields.
#define MOZ_BC_FIELD(name, ...) \
if (!ReadIPDLParam(aMessage, aIterator, aActor, &aInit->m##name)) { \
return false; \
}
#include "mozilla/dom/BrowsingContextFieldList.h"
return true;
}
} // namespace ipc
} // namespace mozilla
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