Source/WebKit2/WebProcess/Storage/StorageAreaMap.cpp

/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include "config.h"
#include "StorageAreaMap.h"

#include "SecurityOriginData.h"
#include "StorageAreaImpl.h"
#include "StorageAreaMapMessages.h"
#include "StorageManagerMessages.h"
#include "StorageNamespaceImpl.h"
#include "WebPage.h"
#include "WebProcess.h"
#include <WebCore/DOMWindow.h>
#include <WebCore/Frame.h>
#include <WebCore/Page.h>
#include <WebCore/Storage.h>
#include <WebCore/StorageEventDispatcher.h>
#include <WebCore/StorageMap.h>

using namespace WebCore;

namespace WebKit {

static uint64_t generateStorageMapID()
{
    static uint64_t storageMapID;
    return ++storageMapID;
}

PassRefPtr<StorageAreaMap> StorageAreaMap::create(StorageNamespaceImpl* storageNamespace, PassRefPtr<WebCore::SecurityOrigin> securityOrigin)
{
    return adoptRef(new StorageAreaMap(storageNamespace, securityOrigin));
}

StorageAreaMap::StorageAreaMap(StorageNamespaceImpl* storageNamespace, PassRefPtr<WebCore::SecurityOrigin> securityOrigin)
    : m_storageMapID(generateStorageMapID())
    , m_storageType(storageNamespace->storageType())
    , m_storageNamespaceID(storageNamespace->storageNamespaceID())
    , m_quotaInBytes(storageNamespace->quotaInBytes())
    , m_securityOrigin(securityOrigin)
{
    if (m_storageType == LocalStorage)
        WebProcess::shared().connection()->send(Messages::StorageManager::CreateLocalStorageMap(m_storageMapID, storageNamespace->storageNamespaceID(), SecurityOriginData::fromSecurityOrigin(m_securityOrigin.get())), 0);
    else
        WebProcess::shared().connection()->send(Messages::StorageManager::CreateSessionStorageMap(m_storageMapID, storageNamespace->storageNamespaceID(), SecurityOriginData::fromSecurityOrigin(m_securityOrigin.get())), 0);
    WebProcess::shared().addMessageReceiver(Messages::StorageAreaMap::messageReceiverName(), m_storageMapID, this);
}

StorageAreaMap::~StorageAreaMap()
{
    WebProcess::shared().connection()->send(Messages::StorageManager::DestroyStorageMap(m_storageMapID), 0);
    WebProcess::shared().removeMessageReceiver(Messages::StorageAreaMap::messageReceiverName(), m_storageMapID);
}

unsigned StorageAreaMap::length()
{
    loadValuesIfNeeded();

    return m_storageMap->length();
}

String StorageAreaMap::key(unsigned index)
{
    loadValuesIfNeeded();

    return m_storageMap->key(index);
}

String StorageAreaMap::item(const String& key)
{
    loadValuesIfNeeded();

    return m_storageMap->getItem(key);
}

void StorageAreaMap::setItem(Frame* sourceFrame, StorageAreaImpl* sourceArea, const String& key, const String& value, bool& quotaException)
{
    loadValuesIfNeeded();

    ASSERT(m_storageMap->hasOneRef());

    String oldValue;
    quotaException = false;
    m_storageMap->setItem(key, value, oldValue, quotaException);
    if (quotaException)
        return;

    if (oldValue == value)
        return;

    m_pendingValueChanges.add(key);

    WebProcess::shared().connection()->send(Messages::StorageManager::SetItem(m_storageMapID, sourceArea->storageAreaID(), key, value, sourceFrame->document()->url()), 0);
}

void StorageAreaMap::removeItem(WebCore::Frame* sourceFrame, StorageAreaImpl* sourceArea, const String& key)
{
    loadValuesIfNeeded();
    ASSERT(m_storageMap->hasOneRef());

    String oldValue;
    m_storageMap->removeItem(key, oldValue);

    if (oldValue.isNull())
        return;

    m_pendingValueChanges.add(key);

    WebProcess::shared().connection()->send(Messages::StorageManager::RemoveItem(m_storageMapID, sourceArea->storageAreaID(), key, sourceFrame->document()->url()), 0);
}

void StorageAreaMap::clear(WebCore::Frame* sourceFrame, StorageAreaImpl* sourceArea)
{
    resetValues();

    m_storageMap = StorageMap::create(m_quotaInBytes);
    WebProcess::shared().connection()->send(Messages::StorageManager::Clear(m_storageMapID, sourceArea->storageAreaID(), sourceFrame->document()->url()), 0);
}

bool StorageAreaMap::contains(const String& key)
{
    loadValuesIfNeeded();

    return m_storageMap->contains(key);
}

void StorageAreaMap::resetValues()
{
    m_storageMap = nullptr;
}

void StorageAreaMap::loadValuesIfNeeded()
{
    if (m_storageMap)
        return;

    HashMap<String, String> values;
    // FIXME: This should use a special sendSync flag to indicate that we don't want to process incoming messages while waiting for a reply.
    // (This flag does not yet exist). Since loadValuesIfNeeded() ends up being called from within JavaScript code, processing incoming synchronous messages
    // could lead to weird reentrency bugs otherwise.
    WebProcess::shared().connection()->sendSync(Messages::StorageManager::GetValues(m_storageMapID), Messages::StorageManager::GetValues::Reply(values), 0);

    m_storageMap = StorageMap::create(m_quotaInBytes);
    m_storageMap->importItems(values);
}

void StorageAreaMap::didSetItem(const String& key, bool quotaError)
{
    // FIXME: Implement.
}

void StorageAreaMap::didRemoveItem(const String& key)
{
    // FIXME: Implement.
}

void StorageAreaMap::didClear()
{
    // FIXME: Implement.
}

void StorageAreaMap::dispatchStorageEvent(uint64_t sourceStorageAreaID, const String& key, const String& oldValue, const String& newValue, const String& urlString)
{
    if (storageType() == SessionStorage)
        dispatchSessionStorageEvent(sourceStorageAreaID, key, oldValue, newValue, urlString);
    else
        dispatchLocalStorageEvent(sourceStorageAreaID, key, oldValue, newValue, urlString);
}

void StorageAreaMap::dispatchSessionStorageEvent(uint64_t sourceStorageAreaID, const String& key, const String& oldValue, const String& newValue, const String& urlString)
{
    ASSERT(storageType() == SessionStorage);

    // Namespace IDs for session storage namespaces are equivalent to web page IDs
    // so we can get the right page here.
    WebPage* webPage = WebProcess::shared().webPage(m_storageNamespaceID);
    if (!webPage)
        return;

    Vector<RefPtr<Frame> > frames;

    Page* page = webPage->corePage();
    for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
        Document* document = frame->document();
        if (!document->securityOrigin()->equal(m_securityOrigin.get()))
            continue;

        Storage* storage = document->domWindow()->optionalSessionStorage();
        if (!storage)
            continue;

        StorageAreaImpl* storageArea = static_cast<StorageAreaImpl*>(storage->area());
        if (storageArea->storageAreaID() == sourceStorageAreaID) {
            // This is the storage area that caused the event to be dispatched.
            continue;
        }

        frames.append(frame);
    }

    StorageEventDispatcher::dispatchLocalStorageEventsToFrames(page->group(), frames, key, oldValue, newValue, urlString, m_securityOrigin.get());
}

void StorageAreaMap::dispatchLocalStorageEvent(uint64_t sourceStorageAreaID, const String& key, const String& oldValue, const String& newValue, const String& urlString)
{
    ASSERT(storageType() == LocalStorage);

    UNUSED_PARAM(key);
    UNUSED_PARAM(oldValue);
    UNUSED_PARAM(newValue);
    UNUSED_PARAM(urlString);
}

} // namespace WebKit