C++ ApplicationCacheResource类代码示例

void ApplicationCacheHost::maybeLoadMainResource(ResourceRequest& request, SubstituteData& substituteData)
{
    // Check if this request should be loaded from the application cache
    if (!substituteData.isValid() && isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
        ASSERT(!m_mainResourceApplicationCache);

        m_mainResourceApplicationCache = ApplicationCacheGroup::cacheForMainRequest(request, &m_documentLoader);

        if (m_mainResourceApplicationCache) {
            // Get the resource from the application cache. By definition, cacheForMainRequest() returns a cache that contains the resource.
            ApplicationCacheResource* resource = m_mainResourceApplicationCache->resourceForRequest(request);

            // ApplicationCache resources have fragment identifiers stripped off of their URLs,
            // but we'll need to restore that for the SubstituteData.
            ResourceResponse responseToUse = resource->response();
            if (request.url().hasFragmentIdentifier()) {
                URL url = responseToUse.url();
                url.setFragmentIdentifier(request.url().fragmentIdentifier());
                responseToUse.setURL(url);
            }

            substituteData = SubstituteData(&resource->data(),
                                            URL(),
                                            responseToUse,
                                            SubstituteData::SessionHistoryVisibility::Visible);
        }
    }
}

bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
{
    ApplicationCacheResource* resource;
    if (shouldLoadResourceFromApplicationCache(request, resource)) {
        if (resource) {
            response = resource->response();
            data.append(resource->data()->data(), resource->data()->size());
        } else {
            error = documentLoader()->frameLoader()->client().cannotShowURLError(request);
        }
        return true;
    }
    return false;
}

void ApplicationCacheHost::maybeLoadFallbackSynchronously(const ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
{
    // If normal loading results in a redirect to a resource with another origin (indicative of a captive portal), or a 4xx or 5xx status code or equivalent,
    // or if there were network errors (but not if the user canceled the download), then instead get, from the cache, the resource of the fallback entry
    // corresponding to the matched namespace.
    if ((!error.isNull() && !error.isCancellation())
         || response.httpStatusCode() / 100 == 4 || response.httpStatusCode() / 100 == 5
         || !protocolHostAndPortAreEqual(request.url(), response.url())) {
        ApplicationCacheResource* resource;
        if (getApplicationCacheFallbackResource(request, resource)) {
            response = resource->response();
            data.clear();
            data.append(resource->data()->data(), resource->data()->size());
        }
    }
}

bool ApplicationCacheStorage::storeCopyOfCache(const String& cacheDirectory, ApplicationCacheHost* cacheHost)
{
    ApplicationCache* cache = cacheHost->applicationCache();
    if (!cache)
        return true;

    // Create a new cache.
    RefPtr<ApplicationCache> cacheCopy = ApplicationCache::create();

    cacheCopy->setOnlineWhitelist(cache->onlineWhitelist());
    cacheCopy->setFallbackURLs(cache->fallbackURLs());

    // Traverse the cache and add copies of all resources.
    ApplicationCache::ResourceMap::const_iterator end = cache->end();
    for (ApplicationCache::ResourceMap::const_iterator it = cache->begin(); it != end; ++it) {
        ApplicationCacheResource* resource = it->second.get();
        
        RefPtr<ApplicationCacheResource> resourceCopy = ApplicationCacheResource::create(resource->url(), resource->response(), resource->type(), resource->data());
        
        cacheCopy->addResource(resourceCopy.release());
    }
    
    // Now create a new cache group.
    OwnPtr<ApplicationCacheGroup> groupCopy(new ApplicationCacheGroup(cache->group()->manifestURL(), true));
    
    groupCopy->setNewestCache(cacheCopy);
    
    ApplicationCacheStorage copyStorage;
    copyStorage.setCacheDirectory(cacheDirectory);
    
    // Empty the cache in case something was there before.
    copyStorage.empty();
    
    return copyStorage.storeNewestCache(groupCopy.get());
}

void ApplicationCacheHost::maybeLoadMainResource(ResourceRequest& request, SubstituteData& substituteData)
{
    // Check if this request should be loaded from the application cache
    if (!substituteData.isValid() && isApplicationCacheEnabled()) {
        ASSERT(!m_mainResourceApplicationCache);

        m_mainResourceApplicationCache = ApplicationCacheGroup::cacheForMainRequest(request, m_documentLoader);

        if (m_mainResourceApplicationCache) {
            // Get the resource from the application cache. By definition, cacheForMainRequest() returns a cache that contains the resource.
            ApplicationCacheResource* resource = m_mainResourceApplicationCache->resourceForRequest(request);
            substituteData = SubstituteData(resource->data(), 
                                            resource->response().mimeType(),
                                            resource->response().textEncodingName(), KURL());
        }
    }
}

void ApplicationCacheHost::maybeLoadFallbackSynchronously(const ResourceRequest& request, ResourceError& error, ResourceResponse& response, RefPtr<SharedBuffer>& data)
{
    // If normal loading results in a redirect to a resource with another origin (indicative of a captive portal), or a 4xx or 5xx status code or equivalent,
    // or if there were network errors (but not if the user canceled the download), then instead get, from the cache, the resource of the fallback entry
    // corresponding to the matched namespace.
    if ((!error.isNull() && !error.isCancellation())
         || response.httpStatusCode() / 100 == 4 || response.httpStatusCode() / 100 == 5
         || !protocolHostAndPortAreEqual(request.url(), response.url())) {
        ApplicationCacheResource* resource;
        if (getApplicationCacheFallbackResource(request, resource)) {
            response = resource->response();
            // FIXME: Clients proably do not need a copy of the SharedBuffer.
            // Remove the call to copy() once we ensure SharedBuffer will not be modified.
            data = resource->data().copy();
        }
    }
}

void ApplicationCacheHost::fillResourceList(ResourceInfoList* resources)
{
    ApplicationCache* cache = applicationCache();
    if (!cache || !cache->isComplete())
        return;

    for (const auto& urlAndResource : cache->resources()) {
        ApplicationCacheResource* resource = urlAndResource.value.get();

        unsigned type = resource->type();
        bool isMaster = type & ApplicationCacheResource::Master;
        bool isManifest = type & ApplicationCacheResource::Manifest;
        bool isExplicit = type & ApplicationCacheResource::Explicit;
        bool isForeign = type & ApplicationCacheResource::Foreign;
        bool isFallback = type & ApplicationCacheResource::Fallback;

        resources->append(ResourceInfo(resource->url(), isMaster, isManifest, isFallback, isForeign, isExplicit, resource->estimatedSizeInStorage()));
    }
}

bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, RefPtr<SharedBuffer>& data)
{
    ApplicationCacheResource* resource;
    if (shouldLoadResourceFromApplicationCache(request, resource)) {
        if (resource) {
            // FIXME: Clients proably do not need a copy of the SharedBuffer.
            // Remove the call to copy() once we ensure SharedBuffer will not be modified.
            if (resource->path().isEmpty())
                data = resource->data().copy();
            else
                data = SharedBuffer::createWithContentsOfFile(resource->path());
        }
        if (!data)
            error = m_documentLoader.frameLoader()->client().cannotShowURLError(request);
        else
            response = resource->response();
        return true;
    }
    return false;
}

void ApplicationCacheGroup::didFail(ResourceHandle* handle, const ResourceError& error)
{
#if ENABLE(INSPECTOR)
    InspectorInstrumentation::didFailLoading(m_frame, m_frame->loader().documentLoader(), m_currentResourceIdentifier, error);
#else
    UNUSED_PARAM(error);
#endif

    if (handle == m_manifestHandle) {
        // A network error is logged elsewhere, no need to log again. Also, it's normal for manifest fetching to fail when working offline.
        cacheUpdateFailed();
        return;
    }

    ASSERT(handle == m_currentHandle);

    unsigned type = m_currentResource ? m_currentResource->type() : m_pendingEntries.get(handle->firstRequest().url());
    URL url(handle->firstRequest().url());
    if (url.hasFragmentIdentifier())
        url.removeFragmentIdentifier();

    ASSERT(!m_currentResource || !m_pendingEntries.contains(url));
    m_currentResource = 0;
    m_pendingEntries.remove(url);

    if ((type & ApplicationCacheResource::Explicit) || (type & ApplicationCacheResource::Fallback)) {
        m_frame->document()->addConsoleMessage(AppCacheMessageSource, ErrorMessageLevel, "Application Cache update failed, because " + url.stringCenterEllipsizedToLength() + " could not be fetched.");
        // Note that cacheUpdateFailed() can cause the cache group to be deleted.
        cacheUpdateFailed();
    } else {
        // Copy the resource and its metadata from the newest application cache in cache group whose completeness flag is complete, and act
        // as if that was the fetched resource, ignoring the resource obtained from the network.
        ASSERT(m_newestCache);
        ApplicationCacheResource* newestCachedResource = m_newestCache->resourceForURL(url);
        ASSERT(newestCachedResource);
        m_cacheBeingUpdated->addResource(ApplicationCacheResource::create(url, newestCachedResource->response(), type, newestCachedResource->data(), newestCachedResource->path()));
        // Load the next resource, if any.
        startLoadingEntry();
    }
}

void MediaPlayerPrivateQuickTimeVisualContext::loadInternal(const String& url)
{
    if (!QTMovie::initializeQuickTime()) {
        // FIXME: is this the right error to return?
        m_networkState = MediaPlayer::DecodeError; 
        m_player->networkStateChanged();
        return;
    }

    disableComponentsOnce();

    // Initialize the task timer.
    MediaPlayerPrivateTaskTimer::initialize();

    if (m_networkState != MediaPlayer::Loading) {
        m_networkState = MediaPlayer::Loading;
        m_player->networkStateChanged();
    }
    if (m_readyState != MediaPlayer::HaveNothing) {
        m_readyState = MediaPlayer::HaveNothing;
        m_player->readyStateChanged();
    }
    cancelSeek();

    setUpCookiesForQuickTime(url);

    m_movie = adoptRef(new QTMovie(m_movieClient.get()));

#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    Frame* frame = m_player->frameView() ? m_player->frameView()->frame() : 0;
    ApplicationCacheHost* cacheHost = frame ? frame->loader()->documentLoader()->applicationCacheHost() : 0;
    ApplicationCacheResource* resource = 0;
    if (cacheHost && cacheHost->shouldLoadResourceFromApplicationCache(ResourceRequest(url), resource) && resource && !resource->path().isEmpty())
        m_movie->load(resource->path().characters(), resource->path().length(), m_player->preservesPitch());
    else
#endif
        m_movie->load(url.characters(), url.length(), m_player->preservesPitch());
    m_movie->setVolume(m_player->volume());
}

void ApplicationCacheGroup::didFail(ResourceHandle* handle, const ResourceError& error)
{
#if ENABLE(INSPECTOR)
    if (Page* page = m_frame->page())
        page->inspectorController()->didFailLoading(m_currentResourceIdentifier, error);
#else
    UNUSED_PARAM(error);
#endif

    if (handle == m_manifestHandle) {
        cacheUpdateFailed();
        return;
    }

    unsigned type = m_currentResource ? m_currentResource->type() : m_pendingEntries.get(handle->firstRequest().url());
    KURL url(handle->firstRequest().url());
    if (url.hasFragmentIdentifier())
        url.removeFragmentIdentifier();

    ASSERT(!m_currentResource || !m_pendingEntries.contains(url));
    m_currentResource = 0;
    m_pendingEntries.remove(url);

    if ((type & ApplicationCacheResource::Explicit) || (type & ApplicationCacheResource::Fallback)) {
        // Note that cacheUpdateFailed() can cause the cache group to be deleted.
        cacheUpdateFailed();
    } else {
        // Copy the resource and its metadata from the newest application cache in cache group whose completeness flag is complete, and act
        // as if that was the fetched resource, ignoring the resource obtained from the network.
        ASSERT(m_newestCache);
        ApplicationCacheResource* newestCachedResource = m_newestCache->resourceForURL(url);
        ASSERT(newestCachedResource);
        m_cacheBeingUpdated->addResource(ApplicationCacheResource::create(url, newestCachedResource->response(), type, newestCachedResource->data()));
        // Load the next resource, if any.
        startLoadingEntry();
    }
}

void MediaPlayerPrivateAVFoundation::setPreload(MediaPlayer::Preload preload)
{
    m_preload = preload;
    if (!m_assetURL.length())
        return;

    setDelayCallbacks(true);

    if (m_preload >= MediaPlayer::MetaData && assetStatus() == MediaPlayerAVAssetStatusDoesNotExist) {
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
        Frame* frame = m_player->frameView() ? m_player->frameView()->frame() : 0;
        ApplicationCacheHost* cacheHost = frame ? frame->loader()->documentLoader()->applicationCacheHost() : 0;
        ApplicationCacheResource* resource;
        if (cacheHost && cacheHost->shouldLoadResourceFromApplicationCache(ResourceRequest(m_assetURL), resource) && resource) {
            // AVFoundation can't open arbitrary data pointers, so if this ApplicationCacheResource doesn't 
            // have a valid local path, just open the resource's original URL.
            if (resource->path().isEmpty())
                createAVAssetForURL(resource->url());
            else
                createAVAssetForCacheResource(resource);
        } else
#endif    
            createAVAssetForURL(m_assetURL);

        createAVPlayer();

        checkPlayability();
    }

    // Don't force creation of the player item unless we already know that the asset is playable. If we aren't
    // there yet, or if we already know it is not playable, creating it now won't help.
    if (m_preload == MediaPlayer::Auto && m_assetIsPlayable)
        createAVPlayerItem();

    setDelayCallbacks(false);
}

void ApplicationCacheGroup::didFinishLoadingManifest()
{
    if (!m_manifestResource) {
        didFailToLoadManifest();
        return;
    }

    bool isUpgradeAttempt = m_newestCache;
    
    m_manifestHandle = 0;

    // Check if the manifest is byte-for-byte identical.
    if (isUpgradeAttempt) {
        ApplicationCacheResource* newestManifest = m_newestCache->manifestResource();
        ASSERT(newestManifest);
    
        if (newestManifest->data()->size() == m_manifestResource->data()->size() &&
            !memcmp(newestManifest->data()->data(), m_manifestResource->data()->data(), newestManifest->data()->size())) {
            
            callListenersOnAssociatedDocuments(&DOMApplicationCache::callNoUpdateListener);
         
            m_status = Idle;
            m_frame = 0;
            m_manifestResource = 0;
            return;
        }
    }
    
    Manifest manifest;
    if (!parseManifest(m_manifestURL, m_manifestResource->data()->data(), m_manifestResource->data()->size(), manifest)) {
        didFailToLoadManifest();
        return;
    }
        
    // We have the manifest, now download the resources.
    m_status = Downloading;
    
    callListenersOnAssociatedDocuments(&DOMApplicationCache::callDownloadingListener);

#ifndef NDEBUG
    // We should only have implicit entries.
    {
        EntryMap::const_iterator end = m_pendingEntries.end();
        for (EntryMap::const_iterator it = m_pendingEntries.begin(); it != end; ++it)
            ASSERT(it->second & ApplicationCacheResource::Implicit);
    }
#endif
    
    if (isUpgradeAttempt) {
        ASSERT(!m_cacheBeingUpdated);
        
        m_cacheBeingUpdated = ApplicationCache::create();
        
        ApplicationCache::ResourceMap::const_iterator end = m_newestCache->end();
        for (ApplicationCache::ResourceMap::const_iterator it = m_newestCache->begin(); it != end; ++it) {
            unsigned type = it->second->type();
            if (type & (ApplicationCacheResource::Implicit | ApplicationCacheResource::Dynamic))
                addEntry(it->first, type);
        }
    }
    
    HashSet<String>::const_iterator end = manifest.explicitURLs.end();
    for (HashSet<String>::const_iterator it = manifest.explicitURLs.begin(); it != end; ++it)
        addEntry(*it, ApplicationCacheResource::Explicit);

    size_t fallbackCount = manifest.fallbackURLs.size();
    for (size_t i = 0; i  < fallbackCount; ++i)
        addEntry(manifest.fallbackURLs[i].second, ApplicationCacheResource::Fallback);
    
    m_cacheBeingUpdated->setOnlineWhitelist(manifest.onlineWhitelistedURLs);
    m_cacheBeingUpdated->setFallbackURLs(manifest.fallbackURLs);
    
    startLoadingEntry();
}

void ApplicationCacheGroup::selectCache(Frame* frame, const KURL& manifestURL)
{
    ASSERT(frame && frame->page());
    
    if (!frame->settings()->offlineWebApplicationCacheEnabled())
        return;
    
    DocumentLoader* documentLoader = frame->loader()->documentLoader();
    ASSERT(!documentLoader->applicationCache());

    if (manifestURL.isNull()) {
        selectCacheWithoutManifestURL(frame);        
        return;
    }
    
    ApplicationCache* mainResourceCache = documentLoader->mainResourceApplicationCache();
    
    if (mainResourceCache) {
        if (manifestURL == mainResourceCache->group()->m_manifestURL) {
            mainResourceCache->group()->associateDocumentLoaderWithCache(documentLoader, mainResourceCache);
            mainResourceCache->group()->update(frame);
        } else {
            // The main resource was loaded from cache, so the cache must have an entry for it. Mark it as foreign.
            ApplicationCacheResource* resource = mainResourceCache->resourceForURL(documentLoader->url());
            bool inStorage = resource->storageID();
            resource->addType(ApplicationCacheResource::Foreign);
            if (inStorage)
                cacheStorage().storeUpdatedType(resource, mainResourceCache);

            // Restart the current navigation from the top of the navigation algorithm, undoing any changes that were made
            // as part of the initial load.
            // The navigation will not result in the same resource being loaded, because "foreign" entries are never picked during navigation.
            frame->loader()->scheduleLocationChange(documentLoader->url(), frame->loader()->referrer(), true);
        }
        
        return;
    }
    
    // The resource was loaded from the network, check if it is a HTTP/HTTPS GET.    
    const ResourceRequest& request = frame->loader()->activeDocumentLoader()->request();

    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request)) {
        selectCacheWithoutManifestURL(frame);
        return;
    }

    // Check that the resource URL has the same scheme/host/port as the manifest URL.
    if (!protocolHostAndPortAreEqual(manifestURL, request.url())) {
        selectCacheWithoutManifestURL(frame);
        return;
    }
            
    ApplicationCacheGroup* group = cacheStorage().findOrCreateCacheGroup(manifestURL);
            
    if (ApplicationCache* cache = group->newestCache()) {
        ASSERT(cache->manifestResource());
                
        group->associateDocumentLoaderWithCache(frame->loader()->documentLoader(), cache);
              
        if (!frame->loader()->documentLoader()->isLoadingMainResource())
            group->finishedLoadingMainResource(frame->loader()->documentLoader());

        group->update(frame);
    } else {
        bool isUpdating = group->m_cacheBeingUpdated;
                
        if (!isUpdating)
            group->m_cacheBeingUpdated = ApplicationCache::create();
        documentLoader->setCandidateApplicationCacheGroup(group);
        group->m_cacheCandidates.add(documentLoader);

        const KURL& url = frame->loader()->documentLoader()->originalURL();
                
        unsigned type = 0;

        // If the resource has already been downloaded, remove it so that it will be replaced with the implicit resource
        if (isUpdating)
            type = group->m_cacheBeingUpdated->removeResource(url);
               
        // Add the main resource URL as an implicit entry.
        group->addEntry(url, type | ApplicationCacheResource::Implicit);

        if (!frame->loader()->documentLoader()->isLoadingMainResource())
            group->finishedLoadingMainResource(frame->loader()->documentLoader());
                
        if (!isUpdating)
            group->update(frame);                
    }               
}

ApplicationCacheGroup* ApplicationCacheStorage::cacheGroupForURL(const KURL& url)
{
    ASSERT(!url.hasFragmentIdentifier());
    
    loadManifestHostHashes();
    
    // Hash the host name and see if there's a manifest with the same host.
    if (!m_cacheHostSet.contains(urlHostHash(url)))
        return 0;

    // Check if a cache already exists in memory.
    CacheGroupMap::const_iterator end = m_cachesInMemory.end();
    for (CacheGroupMap::const_iterator it = m_cachesInMemory.begin(); it != end; ++it) {
        ApplicationCacheGroup* group = it->second;

        ASSERT(!group->isObsolete());

        if (!protocolHostAndPortAreEqual(url, group->manifestURL()))
            continue;
        
        if (ApplicationCache* cache = group->newestCache()) {
            ApplicationCacheResource* resource = cache->resourceForURL(url);
            if (!resource)
                continue;
            if (resource->type() & ApplicationCacheResource::Foreign)
                continue;
            return group;
        }
    }
    
    if (!m_database.isOpen())
        return 0;
        
    // Check the database. Look for all cache groups with a newest cache.
    SQLiteStatement statement(m_database, "SELECT id, manifestURL, newestCache FROM CacheGroups WHERE newestCache IS NOT NULL");
    if (statement.prepare() != SQLResultOk)
        return 0;
    
    int result;
    while ((result = statement.step()) == SQLResultRow) {
        KURL manifestURL = KURL(ParsedURLString, statement.getColumnText(1));

        if (m_cachesInMemory.contains(manifestURL))
            continue;

        if (!protocolHostAndPortAreEqual(url, manifestURL))
            continue;

        // We found a cache group that matches. Now check if the newest cache has a resource with
        // a matching URL.
        unsigned newestCacheID = static_cast<unsigned>(statement.getColumnInt64(2));
        RefPtr<ApplicationCache> cache = loadCache(newestCacheID);
        if (!cache)
            continue;

        ApplicationCacheResource* resource = cache->resourceForURL(url);
        if (!resource)
            continue;
        if (resource->type() & ApplicationCacheResource::Foreign)
            continue;

        ApplicationCacheGroup* group = new ApplicationCacheGroup(manifestURL);
        
        group->setStorageID(static_cast<unsigned>(statement.getColumnInt64(0)));
        group->setNewestCache(cache.release());
        
        m_cachesInMemory.set(group->manifestURL(), group);
        
        return group;
    }

    if (result != SQLResultDone)
        LOG_ERROR("Could not load cache group, error \"%s\"", m_database.lastErrorMsg());
    
    return 0;
}