Source/bindings/v8/DOMWrapperWorld.h

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#ifndef DOMWrapperWorld_h
#define DOMWrapperWorld_h

#include "bindings/v8/NewScriptState.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "wtf/MainThread.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/text/WTFString.h"
#include <v8.h>

namespace WebCore {

class DOMDataStore;
class ScriptController;
class ExecutionContext;

enum WorldIdConstants {
    MainWorldId = 0,
    // Embedder isolated worlds can use IDs in [1, 1<<29).
    EmbedderWorldIdLimit = (1 << 29),
    ScriptPreprocessorIsolatedWorldId,
    IsolatedWorldIdLimit,
    WorkerWorldId,
    TestingWorldId,
};

// This class represent a collection of DOM wrappers for a specific world.
class DOMWrapperWorld : public RefCounted<DOMWrapperWorld> {
public:
    static PassRefPtr<DOMWrapperWorld> create(int worldId = -1, int extensionGroup = -1);

    static const int mainWorldExtensionGroup = 0;
    static PassRefPtr<DOMWrapperWorld> ensureIsolatedWorld(int worldId, int extensionGroup);
    ~DOMWrapperWorld();
    void dispose();

    static bool isolatedWorldsExist() { return isolatedWorldCount; }
    static void allWorldsInMainThread(Vector<RefPtr<DOMWrapperWorld> >& worlds);

    static DOMWrapperWorld& world(v8::Handle<v8::Context> context)
    {
        return NewScriptState::from(context)->world();
    }

    static DOMWrapperWorld& current(v8::Isolate* isolate)
    {
        if (isMainThread() && worldOfInitializingWindow) {
            // It's possible that current() is being called while window is being initialized.
            // In order to make current() workable during the initialization phase,
            // we cache the world of the initializing window on worldOfInitializingWindow.
            // If there is no initiazing window, worldOfInitializingWindow is 0.
            return *worldOfInitializingWindow;
        }
        return world(isolate->GetCurrentContext());
    }

    static DOMWrapperWorld& mainWorld();

    // Associates an isolated world (see above for description) with a security
    // origin. XMLHttpRequest instances used in that world will be considered
    // to come from that origin, not the frame's.
    static void setIsolatedWorldSecurityOrigin(int worldID, PassRefPtr<SecurityOrigin>);
    static void clearIsolatedWorldSecurityOrigin(int worldID);
    SecurityOrigin* isolatedWorldSecurityOrigin();

    // Associated an isolated world with a Content Security Policy. Resources
    // embedded into the main world's DOM from script executed in an isolated
    // world should be restricted based on the isolated world's DOM, not the
    // main world's.
    //
    // FIXME: Right now, resource injection simply bypasses the main world's
    // DOM. More work is necessary to allow the isolated world's policy to be
    // applied correctly.
    static void setIsolatedWorldContentSecurityPolicy(int worldID, const String& policy);
    static void clearIsolatedWorldContentSecurityPolicy(int worldID);
    bool isolatedWorldHasContentSecurityPolicy();

    bool isMainWorld() const { return m_worldId == MainWorldId; }
    bool isWorkerWorld() const { return m_worldId == WorkerWorldId; }
    bool isIsolatedWorld() const { return MainWorldId < m_worldId  && m_worldId < IsolatedWorldIdLimit; }

    int worldId() const { return m_worldId; }
    int extensionGroup() const { return m_extensionGroup; }
    DOMDataStore& domDataStore() { return *m_domDataStore; }

    static void setWorldOfInitializingWindow(DOMWrapperWorld* world)
    {
        ASSERT(isMainThread());
        worldOfInitializingWindow = world;
    }
    // FIXME: Remove this method once we fix crbug.com/345014.
    static bool windowIsBeingInitialized() { return !!worldOfInitializingWindow; }

private:
    DOMWrapperWorld(int worldId, int extensionGroup);

    static unsigned isolatedWorldCount;
    static DOMWrapperWorld* worldOfInitializingWindow;

    const int m_worldId;
    const int m_extensionGroup;
    OwnPtr<DOMDataStore> m_domDataStore;
};

} // namespace WebCore

#endif // DOMWrapperWorld_h