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-rw-r--r-- | docshell/base/BrowsingContextGroup.h | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/docshell/base/BrowsingContextGroup.h b/docshell/base/BrowsingContextGroup.h new file mode 100644 index 0000000000..2f8649da2d --- /dev/null +++ b/docshell/base/BrowsingContextGroup.h @@ -0,0 +1,318 @@ +/* -*- 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/. */ + +#ifndef mozilla_dom_BrowsingContextGroup_h +#define mozilla_dom_BrowsingContextGroup_h + +#include "mozilla/dom/BrowsingContext.h" +#include "mozilla/FunctionRef.h" +#include "nsRefPtrHashtable.h" +#include "nsHashKeys.h" +#include "nsTArray.h" +#include "nsTHashSet.h" +#include "nsWrapperCache.h" +#include "nsXULAppAPI.h" + +namespace mozilla { +class ThrottledEventQueue; + +namespace dom { + +// Amount of time allowed between alert/prompt/confirm before enabling +// the stop dialog checkbox. +#define DEFAULT_SUCCESSIVE_DIALOG_TIME_LIMIT 3 // 3 sec + +class BrowsingContext; +class WindowContext; +class ContentParent; +class DocGroup; + +// A BrowsingContextGroup represents the Unit of Related Browsing Contexts in +// the standard. +// +// A BrowsingContext may not hold references to other BrowsingContext objects +// which are not in the same BrowsingContextGroup. +class BrowsingContextGroup final : public nsWrapperCache { + public: + NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(BrowsingContextGroup) + NS_DECL_CYCLE_COLLECTION_NATIVE_WRAPPERCACHE_CLASS(BrowsingContextGroup) + + // Interact with the list of synced contexts. This controls the lifecycle of + // the BrowsingContextGroup and contexts loaded within them. + void Register(nsISupports* aContext); + void Unregister(nsISupports* aContext); + + // Control which processes will be used to host documents loaded in this + // BrowsingContextGroup. There should only ever be one host process per remote + // type. + // + // A new host process will be subscribed to the BrowsingContextGroup unless it + // is still launching, in which case it will subscribe itself when it is done + // launching. + void EnsureHostProcess(ContentParent* aProcess); + + // A removed host process will no longer be used to host documents loaded in + // this BrowsingContextGroup. + void RemoveHostProcess(ContentParent* aProcess); + + // Synchronize the current BrowsingContextGroup state down to the given + // content process, and continue updating it. + // + // You rarely need to call this directly, as it's automatically called by + // |EnsureHostProcess| as needed. + void Subscribe(ContentParent* aProcess); + + // Stop synchronizing the current BrowsingContextGroup state down to a given + // content process. The content process must no longer be a host process. + void Unsubscribe(ContentParent* aProcess); + + // Look up the process which should be used to host documents with this + // RemoteType. This will be a non-dead process associated with this + // BrowsingContextGroup, if possible. + ContentParent* GetHostProcess(const nsACString& aRemoteType); + + // When a BrowsingContext is being discarded, we may want to keep the + // corresponding BrowsingContextGroup alive until the other process + // acknowledges that the BrowsingContext has been discarded. A `KeepAlive` + // will be added to the `BrowsingContextGroup`, delaying destruction. + void AddKeepAlive(); + void RemoveKeepAlive(); + + // A `KeepAlivePtr` will hold both a strong reference to the + // `BrowsingContextGroup` and holds a `KeepAlive`. When the pointer is + // dropped, it will release both the strong reference and the keepalive. + struct KeepAliveDeleter { + void operator()(BrowsingContextGroup* aPtr) { + if (RefPtr<BrowsingContextGroup> ptr = already_AddRefed(aPtr)) { + ptr->RemoveKeepAlive(); + } + } + }; + using KeepAlivePtr = UniquePtr<BrowsingContextGroup, KeepAliveDeleter>; + KeepAlivePtr MakeKeepAlivePtr(); + + // Call when we want to check if we should suspend or resume all top level + // contexts. + void UpdateToplevelsSuspendedIfNeeded(); + + // Get a reference to the list of toplevel contexts in this + // BrowsingContextGroup. + nsTArray<RefPtr<BrowsingContext>>& Toplevels() { return mToplevels; } + void GetToplevels(nsTArray<RefPtr<BrowsingContext>>& aToplevels) { + aToplevels.AppendElements(mToplevels); + } + + uint64_t Id() { return mId; } + + nsISupports* GetParentObject() const; + JSObject* WrapObject(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) override; + + // Get or create a BrowsingContextGroup with the given ID. + static already_AddRefed<BrowsingContextGroup> GetOrCreate(uint64_t aId); + static already_AddRefed<BrowsingContextGroup> GetExisting(uint64_t aId); + static already_AddRefed<BrowsingContextGroup> Create( + bool aPotentiallyCrossOriginIsolated = false); + static already_AddRefed<BrowsingContextGroup> Select( + WindowContext* aParent, BrowsingContext* aOpener); + + // Like `Create` but only generates and reserves a new ID without actually + // creating the BrowsingContextGroup object. + static uint64_t CreateId(bool aPotentiallyCrossOriginIsolated = false); + + // For each 'ContentParent', except for 'aExcludedParent', + // associated with this group call 'aCallback'. + template <typename Func> + void EachOtherParent(ContentParent* aExcludedParent, Func&& aCallback) { + MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess()); + for (const auto& key : mSubscribers) { + if (key != aExcludedParent) { + aCallback(key); + } + } + } + + // For each 'ContentParent' associated with + // this group call 'aCallback'. + template <typename Func> + void EachParent(Func&& aCallback) { + MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess()); + for (const auto& key : mSubscribers) { + aCallback(key); + } + } + + nsresult QueuePostMessageEvent(nsIRunnable* aRunnable); + + void FlushPostMessageEvents(); + + // Increase or decrease the suspension level in InputTaskManager + void UpdateInputTaskManagerIfNeeded(bool aIsActive); + + static BrowsingContextGroup* GetChromeGroup(); + + void GetDocGroups(nsTArray<DocGroup*>& aDocGroups); + + // Called by Document when a Document needs to be added to a DocGroup. + already_AddRefed<DocGroup> AddDocument(const nsACString& aKey, + Document* aDocument); + + // Called by Document when a Document needs to be removed from a DocGroup. + // aDocGroup should be from aDocument. This is done to avoid the assert + // in GetDocGroup() which can crash when called during unlinking. + void RemoveDocument(Document* aDocument, DocGroup* aDocGroup); + + mozilla::ThrottledEventQueue* GetTimerEventQueue() const { + return mTimerEventQueue; + } + + mozilla::ThrottledEventQueue* GetWorkerEventQueue() const { + return mWorkerEventQueue; + } + + void SetAreDialogsEnabled(bool aAreDialogsEnabled) { + mAreDialogsEnabled = aAreDialogsEnabled; + } + + bool GetAreDialogsEnabled() { return mAreDialogsEnabled; } + + bool GetDialogAbuseCount() { return mDialogAbuseCount; } + + // For tests only. + void ResetDialogAbuseState(); + + bool DialogsAreBeingAbused(); + + TimeStamp GetLastDialogQuitTime() { return mLastDialogQuitTime; } + + void SetLastDialogQuitTime(TimeStamp aLastDialogQuitTime) { + mLastDialogQuitTime = aLastDialogQuitTime; + } + + // Whether all toplevel documents loaded in this group are allowed to be + // Cross-Origin Isolated. + // + // This does not reflect the actual value of `crossOriginIsolated`, as that + // also requires that the document is loaded within a `webCOOP+COEP` content + // process. + bool IsPotentiallyCrossOriginIsolated(); + + static void GetAllGroups(nsTArray<RefPtr<BrowsingContextGroup>>& aGroups); + + void IncInputEventSuspensionLevel(); + void DecInputEventSuspensionLevel(); + + void ChildDestroy(); + + private: + friend class CanonicalBrowsingContext; + + explicit BrowsingContextGroup(uint64_t aId); + ~BrowsingContextGroup(); + + void MaybeDestroy(); + void Destroy(); + + bool ShouldSuspendAllTopLevelContexts() const; + + bool HasActiveBC(); + void DecInputTaskManagerSuspensionLevel(); + void IncInputTaskManagerSuspensionLevel(); + + uint64_t mId; + + uint32_t mKeepAliveCount = 0; + +#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED + bool mDestroyed = false; +#endif + + // A BrowsingContextGroup contains a series of {Browsing,Window}Context + // objects. They are addressed using a hashtable to avoid linear lookup when + // adding or removing elements from the set. + // + // FIXME: This list is only required over a counter to keep nested + // non-discarded contexts within discarded contexts alive. It should be + // removed in the future. + // FIXME: Consider introducing a better common base than `nsISupports`? + nsTHashSet<nsRefPtrHashKey<nsISupports>> mContexts; + + // The set of toplevel browsing contexts in the current BrowsingContextGroup. + nsTArray<RefPtr<BrowsingContext>> mToplevels; + + // Whether or not all toplevels in this group should be suspended + bool mToplevelsSuspended = false; + + // DocGroups are thread-safe, and not able to be cycle collected, + // but we still keep strong pointers. When all Documents are removed + // from DocGroup (by the BrowsingContextGroup), the DocGroup is + // removed from here. + nsRefPtrHashtable<nsCStringHashKey, DocGroup> mDocGroups; + + // The content process which will host documents in this BrowsingContextGroup + // which need to be loaded with a given remote type. + // + // A non-launching host process must also be a subscriber, though a launching + // host process may not yet be subscribed, and a subscriber need not be a host + // process. + nsRefPtrHashtable<nsCStringHashKey, ContentParent> mHosts; + + nsTHashSet<nsRefPtrHashKey<ContentParent>> mSubscribers; + + // A queue to store postMessage events during page load, the queue will be + // flushed once the page is loaded + RefPtr<mozilla::ThrottledEventQueue> mPostMessageEventQueue; + + RefPtr<mozilla::ThrottledEventQueue> mTimerEventQueue; + RefPtr<mozilla::ThrottledEventQueue> mWorkerEventQueue; + + // A counter to keep track of the input event suspension level of this BCG + // + // We use BrowsingContextGroup to emulate process isolation in Fission, so + // documents within the same the same BCG will behave like they share + // the same input task queue. + uint32_t mInputEventSuspensionLevel = 0; + // Whether this BCG has increased the suspension level in InputTaskManager + bool mHasIncreasedInputTaskManagerSuspensionLevel = false; + + // This flag keeps track of whether dialogs are + // currently enabled for windows of this group. + // It's OK to have these local to each process only because even if + // frames from two/three different sites (and thus, processes) coordinate a + // dialog abuse attack, they would only the double/triple number of dialogs, + // as it is still limited per-site. + bool mAreDialogsEnabled = true; + + // This counts the number of windows that have been opened in rapid succession + // (i.e. within dom.successive_dialog_time_limit of each other). It is reset + // to 0 once a dialog is opened after dom.successive_dialog_time_limit seconds + // have elapsed without any other dialogs. + // See comment for mAreDialogsEnabled as to why it's ok to have this local to + // each process. + uint32_t mDialogAbuseCount = 0; + + // This holds the time when the last modal dialog was shown. If more than + // MAX_DIALOG_LIMIT dialogs are shown within the time span defined by + // dom.successive_dialog_time_limit, we show a checkbox or confirmation prompt + // to allow disabling of further dialogs from windows in this BC group. + TimeStamp mLastDialogQuitTime; +}; +} // namespace dom +} // namespace mozilla + +inline void ImplCycleCollectionUnlink( + mozilla::dom::BrowsingContextGroup::KeepAlivePtr& aField) { + aField = nullptr; +} + +inline void ImplCycleCollectionTraverse( + nsCycleCollectionTraversalCallback& aCallback, + mozilla::dom::BrowsingContextGroup::KeepAlivePtr& aField, const char* aName, + uint32_t aFlags = 0) { + CycleCollectionNoteChild(aCallback, aField.get(), aName, aFlags); +} + +#endif // !defined(mozilla_dom_BrowsingContextGroup_h) |