C++ ApplicationCache类代码示例

bool ApplicationCacheHost::shouldLoadResourceFromApplicationCache(const ResourceRequest& originalRequest, ApplicationCacheResource*& resource)
{
    ApplicationCache* cache = applicationCache();
    if (!cache || !cache->isComplete())
        return false;

    ResourceRequest request(originalRequest);
    if (Frame* loaderFrame = m_documentLoader.frame()) {
        if (Document* document = loaderFrame->document())
            document->contentSecurityPolicy()->upgradeInsecureRequestIfNeeded(request, ContentSecurityPolicy::InsecureRequestType::Load);
    }
    
    // If the resource is not to be fetched using the HTTP GET mechanism or equivalent, or if its URL has a different
    // <scheme> component than the application cache's manifest, then fetch the resource normally.
    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request) || !equalIgnoringASCIICase(request.url().protocol(), cache->manifestResource()->url().protocol()))
        return false;

    // If the resource's URL is an master entry, the manifest, an explicit entry, or a fallback entry
    // in the application cache, then get the resource from the cache (instead of fetching it).
    resource = cache->resourceForURL(request.url());

    // Resources that match fallback namespaces or online whitelist entries are fetched from the network,
    // unless they are also cached.
    if (!resource && (cache->allowsAllNetworkRequests() || cache->urlMatchesFallbackNamespace(request.url()) || cache->isURLInOnlineWhitelist(request.url())))
        return false;

    // Resources that are not present in the manifest will always fail to load (at least, after the
    // cache has been primed the first time), making the testing of offline applications simpler.
    return true;
}

unsigned DOMApplicationCache::length() const
{
    ApplicationCache* cache = associatedCache();
    if (!cache)
        return 0;
    
    return cache->numDynamicEntries();
}

bool ApplicationCacheHost::update()
{
    ApplicationCache* cache = applicationCache();
    if (!cache)
        return false;
    cache->group()->update(m_documentLoader->frame(), ApplicationCacheUpdateWithoutBrowsingContext);
    return true;
}

void ApplicationCacheHost::abort()
{
    ApplicationCacheGroup* cacheGroup = candidateApplicationCacheGroup();
    if (cacheGroup)
        cacheGroup->abort(m_documentLoader->frame());
    else {
        ApplicationCache* cache = applicationCache();
        if (cache)
            cache->group()->abort(m_documentLoader->frame());
    }
}

void ApplicationCacheGroup::selectCacheWithoutManifestURL(Frame* frame)
{
    if (!frame->settings()->offlineWebApplicationCacheEnabled())
        return;

    DocumentLoader* documentLoader = frame->loader()->documentLoader();
    ASSERT(!documentLoader->applicationCache());

    ApplicationCache* mainResourceCache = documentLoader->mainResourceApplicationCache();

    if (mainResourceCache) {
        mainResourceCache->group()->associateDocumentLoaderWithCache(documentLoader, mainResourceCache);
        mainResourceCache->group()->update(frame);
    }
}

void ApplicationCacheHost::fillResourceList(ResourceInfoList* resources)
{
    ApplicationCache* cache = applicationCache();
    if (!cache || !cache->isComplete())
        return;
    
    for (const auto& urlAndResource : *cache) {
        RefPtr<ApplicationCacheResource> resource = urlAndResource.value;
        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()));
    }
}

void ApplicationCacheHost::fillResourceList(ResourceInfoList* resources)
{
    ApplicationCache* cache = applicationCache();
    if (!cache || !cache->isComplete())
        return;
     
    ApplicationCache::ResourceMap::const_iterator end = cache->end();
    for (ApplicationCache::ResourceMap::const_iterator it = cache->begin(); it != end; ++it) {
        RefPtr<ApplicationCacheResource> resource = it->value;
        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()));
    }
}

void ApplicationCacheGroup::selectCacheWithoutManifestURL(Frame* frame)
{
    if (!frame->settings().offlineWebApplicationCacheEnabled())
        return;

    if (!frame->document()->securityOrigin()->canAccessApplicationCache(frame->tree().top().document()->securityOrigin()))
        return;

    DocumentLoader* documentLoader = frame->loader().documentLoader();
    ASSERT(!documentLoader->applicationCacheHost()->applicationCache());

    ApplicationCache* mainResourceCache = documentLoader->applicationCacheHost()->mainResourceApplicationCache();

    if (mainResourceCache) {
        mainResourceCache->group()->associateDocumentLoaderWithCache(documentLoader, mainResourceCache);
        mainResourceCache->group()->update(frame, ApplicationCacheUpdateWithBrowsingContext);
    }
}

bool DOMApplicationCache::swapCache()
{
    if (!m_frame)
        return false;
    
    ApplicationCache* cache = m_frame->loader()->documentLoader()->applicationCache();
    if (!cache)
        return false;
    
    // Check if we already have the newest cache
    ApplicationCache* newestCache = cache->group()->newestCache();
    if (cache == newestCache)
        return false;
    
    ASSERT(cache->group() == newestCache->group());
    m_frame->loader()->documentLoader()->setApplicationCache(newestCache);
    
    return true;
}

bool DocumentLoader::shouldLoadResourceFromApplicationCache(const ResourceRequest& request, ApplicationCacheResource*& resource)
{
    ApplicationCache* cache = topLevelApplicationCache();    
    if (!cache)
        return false;
    
    // If the resource is not a HTTP/HTTPS GET, then abort
    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request))
        return false;
    
    if (cache->isURLInOnlineWhitelist(request.url()))
        return false;
    
    resource = cache->resourceForURL(request.url());
    
    // Don't load foreign resources.
    if (resource && (resource->type() & ApplicationCacheResource::Foreign))
        resource = 0;
    
    return true;
}

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());
}

bool DocumentLoader::shouldLoadResourceFromApplicationCache(const ResourceRequest& request, ApplicationCacheResource*& resource)
{
    ApplicationCache* cache = applicationCache();
    if (!cache)
        return false;

    // If the resource is not a HTTP/HTTPS GET, then abort
    if (!ApplicationCache::requestIsHTTPOrHTTPSGet(request))
        return false;

    // If the resource's URL is an master entry, the manifest, an explicit entry, a fallback entry, or a dynamic entry
    // in the application cache, then get the resource from the cache (instead of fetching it).
    resource = cache->resourceForURL(request.url());

    // Resources that match fallback namespaces or online whitelist entries are fetched from the network,
    // unless they are also cached.
    if (!resource && (cache->urlMatchesFallbackNamespace(request.url()) || cache->isURLInOnlineWhitelist(request.url())))
        return false;

    // Resources that are not present in the manifest will always fail to load (at least, after the
    // cache has been primed the first time), making the testing of offline applications simpler.
    return true;
}