Source/WebCore/loader/appcache/ApplicationCacheHost.cpp - third_party/webkit - Git at Google

 /*
  * Copyright (C) 2008-2016 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    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. ``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
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "ApplicationCacheHost.h"

 #include "ApplicationCache.h"
 #include "ApplicationCacheGroup.h"
 #include "ApplicationCacheResource.h"
 #include "ContentSecurityPolicy.h"
 #include "DocumentLoader.h"
 #include "DOMApplicationCache.h"
 #include "FileSystem.h"
 #include "Frame.h"
 #include "FrameLoader.h"
 #include "FrameLoaderClient.h"
 #include "InspectorInstrumentation.h"
 #include "MainFrame.h"
 #include "Page.h"
 #include "ProgressEvent.h"
 #include "ResourceHandle.h"
 #include "ResourceRequest.h"
 #include "Settings.h"
 #include "SubresourceLoader.h"

 namespace WebCore {

 ApplicationCacheHost::ApplicationCacheHost(DocumentLoader& documentLoader)
     : m_domApplicationCache(nullptr)
     , m_documentLoader(documentLoader)
     , m_defersEvents(true)
     , m_candidateApplicationCacheGroup(nullptr)
 {
 }

 ApplicationCacheHost::~ApplicationCacheHost()
 {
     ASSERT(!m_applicationCache || !m_candidateApplicationCacheGroup || m_applicationCache->group() == m_candidateApplicationCacheGroup);

     if (m_applicationCache)
         m_applicationCache->group()->disassociateDocumentLoader(&m_documentLoader);
     else if (m_candidateApplicationCacheGroup)
         m_candidateApplicationCacheGroup->disassociateDocumentLoader(&m_documentLoader);
 }

 void ApplicationCacheHost::selectCacheWithoutManifest()
 {
     ApplicationCacheGroup::selectCacheWithoutManifestURL(m_documentLoader.frame());
 }

 void ApplicationCacheHost::selectCacheWithManifest(const URL& manifestURL)
 {
     ApplicationCacheGroup::selectCache(m_documentLoader.frame(), manifestURL);
 }

 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);
         }
     }
 }

 void ApplicationCacheHost::maybeLoadMainResourceForRedirect(ResourceRequest& request, SubstituteData& substituteData)
 {
     ASSERT(status() == UNCACHED);
     maybeLoadMainResource(request, substituteData);
 }

 bool ApplicationCacheHost::maybeLoadFallbackForMainResponse(const ResourceRequest& request, const ResourceResponse& r)
 {
     if (r.httpStatusCode() / 100 == 4 || r.httpStatusCode() / 100 == 5) {
         ASSERT(!m_mainResourceApplicationCache);
         if (isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
             m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, &m_documentLoader);

             if (scheduleLoadFallbackResourceFromApplicationCache(m_documentLoader.mainResourceLoader(), m_mainResourceApplicationCache.get()))
                 return true;
         }
     }
     return false;
 }

 bool ApplicationCacheHost::maybeLoadFallbackForMainError(const ResourceRequest& request, const ResourceError& error)
 {
     if (!error.isCancellation()) {
         ASSERT(!m_mainResourceApplicationCache);
         if (isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
             m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, &m_documentLoader);

             if (scheduleLoadFallbackResourceFromApplicationCache(m_documentLoader.mainResourceLoader(), m_mainResourceApplicationCache.get()))
                 return true;
         }
     }
     return false;
 }

 void ApplicationCacheHost::mainResourceDataReceived(const char*, int, long long, bool)
 {
     // This method is here to facilitate alternate implemetations of this interface by the host browser.
 }

 void ApplicationCacheHost::failedLoadingMainResource()
 {
     ApplicationCacheGroup* group = m_candidateApplicationCacheGroup;
     if (!group && m_applicationCache) {
         if (mainResourceApplicationCache()) {
             // Even when the main resource is being loaded from an application cache, loading can fail if aborted.
             return;
         }
         group = m_applicationCache->group();
     }

     if (group)
         group->failedLoadingMainResource(&m_documentLoader);
 }

 void ApplicationCacheHost::finishedLoadingMainResource()
 {
     ApplicationCacheGroup* group = candidateApplicationCacheGroup();
     if (!group && applicationCache() && !mainResourceApplicationCache())
         group = applicationCache()->group();

     if (group)
         group->finishedLoadingMainResource(&m_documentLoader);
 }

 bool ApplicationCacheHost::maybeLoadResource(ResourceLoader& loader, const ResourceRequest& request, const URL& originalURL)
 {
     if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request))
         return false;

     if (request.url() != originalURL)
         return false;

     ApplicationCacheResource* resource;
     if (!shouldLoadResourceFromApplicationCache(request, resource))
         return false;

     m_documentLoader.scheduleSubstituteResourceLoad(loader, *resource);
     return true;
 }

 bool ApplicationCacheHost::maybeLoadFallbackForRedirect(ResourceLoader* resourceLoader, ResourceRequest& request, const ResourceResponse& redirectResponse)
 {
     if (!redirectResponse.isNull() && !protocolHostAndPortAreEqual(request.url(), redirectResponse.url()))
         if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
             return true;
     return false;
 }

 bool ApplicationCacheHost::maybeLoadFallbackForResponse(ResourceLoader* resourceLoader, const ResourceResponse& response)
 {
     if (response.httpStatusCode() / 100 == 4 || response.httpStatusCode() / 100 == 5)
         if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
             return true;
     return false;
 }

 bool ApplicationCacheHost::maybeLoadFallbackForError(ResourceLoader* resourceLoader, const ResourceError& error)
 {
     if (!error.isCancellation()) {
         if (resourceLoader == m_documentLoader.mainResourceLoader())
             return maybeLoadFallbackForMainError(resourceLoader->request(), error);
         if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
             return true;
     }
     return false;
 }

 URL ApplicationCacheHost::createFileURL(const String& path)
 {
     // FIXME: Can we just use fileURLWithFileSystemPath instead?

     // fileURLWithFileSystemPath function is not suitable because URL::setPath uses encodeWithURLEscapeSequences, which it notes
     // does not correctly escape '#' and '?'. This function works for our purposes because
     // app cache media files are always created with encodeForFileName(createCanonicalUUIDString()).

 #if USE(CF) && PLATFORM(WIN)
     RetainPtr<CFURLRef> cfURL = adoptCF(CFURLCreateWithFileSystemPath(0, path.createCFString().get(), kCFURLWindowsPathStyle, false));
     URL url(cfURL.get());
 #else
     URL url;

     url.setProtocol(ASCIILiteral("file"));
     url.setPath(path);
 #endif
     return url;
 }

 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 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();
         }
     }
 }

 bool ApplicationCacheHost::canCacheInPageCache()
 {
     return !applicationCache() && !candidateApplicationCacheGroup();
 }

 void ApplicationCacheHost::setDOMApplicationCache(DOMApplicationCache* domApplicationCache)
 {
     ASSERT(!m_domApplicationCache || !domApplicationCache);
     m_domApplicationCache = domApplicationCache;
 }

 void ApplicationCacheHost::notifyDOMApplicationCache(EventID id, int total, int done)
 {
     if (id != PROGRESS_EVENT)
         InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());

     if (m_defersEvents) {
         // Event dispatching is deferred until document.onload has fired.
         m_deferredEvents.append(DeferredEvent(id, total, done));
         return;
     }
     dispatchDOMEvent(id, total, done);
 }

 void ApplicationCacheHost::stopLoadingInFrame(Frame* frame)
 {
     ASSERT(!m_applicationCache || !m_candidateApplicationCacheGroup || m_applicationCache->group() == m_candidateApplicationCacheGroup);

     if (m_candidateApplicationCacheGroup)
         m_candidateApplicationCacheGroup->stopLoadingInFrame(frame);
     else if (m_applicationCache)
         m_applicationCache->group()->stopLoadingInFrame(frame);
 }

 void ApplicationCacheHost::stopDeferringEvents()
 {
     Ref<DocumentLoader> protect(m_documentLoader);
     for (auto& event : m_deferredEvents)
         dispatchDOMEvent(event.eventID, event.progressTotal, event.progressDone);
     m_deferredEvents.clear();
     m_defersEvents = false;
 }

 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()));
     }
 }

 ApplicationCacheHost::CacheInfo ApplicationCacheHost::applicationCacheInfo()
 {
     ApplicationCache* cache = applicationCache();
     if (!cache || !cache->isComplete())
         return CacheInfo(URL(), 0, 0, 0);

     // FIXME: Add "Creation Time" and "Update Time" to Application Caches.
     return CacheInfo(cache->manifestResource()->url(), 0, 0, cache->estimatedSizeInStorage());
 }

 void ApplicationCacheHost::dispatchDOMEvent(EventID id, int total, int done)
 {
     if (m_domApplicationCache) {
         const AtomicString& eventType = DOMApplicationCache::toEventType(id);
         RefPtr<Event> event;
         if (id == PROGRESS_EVENT)
             event = ProgressEvent::create(eventType, true, done, total);
         else
             event = Event::create(eventType, false, false);
         m_domApplicationCache->dispatchEvent(*event);
     }
 }

 void ApplicationCacheHost::setCandidateApplicationCacheGroup(ApplicationCacheGroup* group)
 {
     ASSERT(!m_applicationCache);
     m_candidateApplicationCacheGroup = group;
 }

 void ApplicationCacheHost::setApplicationCache(PassRefPtr<ApplicationCache> applicationCache)
 {
     if (m_candidateApplicationCacheGroup) {
         ASSERT(!m_applicationCache);
         m_candidateApplicationCacheGroup = nullptr;
     }

     m_applicationCache = applicationCache;
 }

 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;
 }

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

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

     URL fallbackURL;
     if (cache->isURLInOnlineWhitelist(request.url()))
         return false;
     if (!cache->urlMatchesFallbackNamespace(request.url(), &fallbackURL))
         return false;

     resource = cache->resourceForURL(fallbackURL);
     ASSERT(resource);

     return true;
 }

 bool ApplicationCacheHost::scheduleLoadFallbackResourceFromApplicationCache(ResourceLoader* loader, ApplicationCache* cache)
 {
     if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(loader->request()))
         return false;

     ApplicationCacheResource* resource;
     if (!getApplicationCacheFallbackResource(loader->request(), resource, cache))
         return false;

     loader->willSwitchToSubstituteResource();

     m_documentLoader.scheduleSubstituteResourceLoad(*loader, *resource);

     return true;
 }

 ApplicationCacheHost::Status ApplicationCacheHost::status() const
 {
     ApplicationCache* cache = applicationCache();
     if (!cache)
         return UNCACHED;

     switch (cache->group()->updateStatus()) {
         case ApplicationCacheGroup::Checking:
             return CHECKING;
         case ApplicationCacheGroup::Downloading:
             return DOWNLOADING;
         case ApplicationCacheGroup::Idle: {
             if (cache->group()->isObsolete())
                 return OBSOLETE;
             if (cache != cache->group()->newestCache())
                 return UPDATEREADY;
             return IDLE;
         }
     }

     ASSERT_NOT_REACHED();
     return UNCACHED;
 }

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

 bool ApplicationCacheHost::swapCache()
 {
     ApplicationCache* cache = applicationCache();
     if (!cache)
         return false;

     // If the group of application caches to which cache belongs has the lifecycle status obsolete, unassociate document from cache.
     if (cache->group()->isObsolete()) {
         cache->group()->disassociateDocumentLoader(&m_documentLoader);
         return true;
     }

     // If there is no newer cache, raise an INVALID_STATE_ERR exception.
     ApplicationCache* newestCache = cache->group()->newestCache();
     if (cache == newestCache)
         return false;

     ASSERT(cache->group() == newestCache->group());
     setApplicationCache(newestCache);
     InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());
     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());
     }
 }

 bool ApplicationCacheHost::isApplicationCacheEnabled()
 {
     return m_documentLoader.frame() && m_documentLoader.frame()->settings().offlineWebApplicationCacheEnabled() && !m_documentLoader.frame()->page()->usesEphemeralSession();
 }

 bool ApplicationCacheHost::isApplicationCacheBlockedForRequest(const ResourceRequest& request)
 {
     Frame* frame = m_documentLoader.frame();
     if (!frame)
         return false;

     if (frame->isMainFrame())
         return false;

     Ref<SecurityOrigin> origin(SecurityOrigin::create(request.url()));
     return !origin.get().canAccessApplicationCache(frame->document()->topOrigin());
 }

 }  // namespace WebCore
	/*
	* Copyright (C) 2008-2016 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:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* 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. ``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
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "ApplicationCacheHost.h"

	#include "ApplicationCache.h"
	#include "ApplicationCacheGroup.h"
	#include "ApplicationCacheResource.h"
	#include "ContentSecurityPolicy.h"
	#include "DocumentLoader.h"
	#include "DOMApplicationCache.h"
	#include "FileSystem.h"
	#include "Frame.h"
	#include "FrameLoader.h"
	#include "FrameLoaderClient.h"
	#include "InspectorInstrumentation.h"
	#include "MainFrame.h"
	#include "Page.h"
	#include "ProgressEvent.h"
	#include "ResourceHandle.h"
	#include "ResourceRequest.h"
	#include "Settings.h"
	#include "SubresourceLoader.h"

	namespace WebCore {

	ApplicationCacheHost::ApplicationCacheHost(DocumentLoader& documentLoader)
	: m_domApplicationCache(nullptr)
	, m_documentLoader(documentLoader)
	, m_defersEvents(true)
	, m_candidateApplicationCacheGroup(nullptr)
	{
	}

	ApplicationCacheHost::~ApplicationCacheHost()
	{
	ASSERT(!m_applicationCache \|\| !m_candidateApplicationCacheGroup \|\| m_applicationCache->group() == m_candidateApplicationCacheGroup);

	if (m_applicationCache)
	m_applicationCache->group()->disassociateDocumentLoader(&m_documentLoader);
	else if (m_candidateApplicationCacheGroup)
	m_candidateApplicationCacheGroup->disassociateDocumentLoader(&m_documentLoader);
	}

	void ApplicationCacheHost::selectCacheWithoutManifest()
	{
	ApplicationCacheGroup::selectCacheWithoutManifestURL(m_documentLoader.frame());
	}

	void ApplicationCacheHost::selectCacheWithManifest(const URL& manifestURL)
	{
	ApplicationCacheGroup::selectCache(m_documentLoader.frame(), manifestURL);
	}

	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);
	}
	}
	}

	void ApplicationCacheHost::maybeLoadMainResourceForRedirect(ResourceRequest& request, SubstituteData& substituteData)
	{
	ASSERT(status() == UNCACHED);
	maybeLoadMainResource(request, substituteData);
	}

	bool ApplicationCacheHost::maybeLoadFallbackForMainResponse(const ResourceRequest& request, const ResourceResponse& r)
	{
	if (r.httpStatusCode() / 100 == 4 \|\| r.httpStatusCode() / 100 == 5) {
	ASSERT(!m_mainResourceApplicationCache);
	if (isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
	m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, &m_documentLoader);

	if (scheduleLoadFallbackResourceFromApplicationCache(m_documentLoader.mainResourceLoader(), m_mainResourceApplicationCache.get()))
	return true;
	}
	}
	return false;
	}

	bool ApplicationCacheHost::maybeLoadFallbackForMainError(const ResourceRequest& request, const ResourceError& error)
	{
	if (!error.isCancellation()) {
	ASSERT(!m_mainResourceApplicationCache);
	if (isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
	m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, &m_documentLoader);

	if (scheduleLoadFallbackResourceFromApplicationCache(m_documentLoader.mainResourceLoader(), m_mainResourceApplicationCache.get()))
	return true;
	}
	}
	return false;
	}

	void ApplicationCacheHost::mainResourceDataReceived(const char*, int, long long, bool)
	{
	// This method is here to facilitate alternate implemetations of this interface by the host browser.
	}

	void ApplicationCacheHost::failedLoadingMainResource()
	{
	ApplicationCacheGroup* group = m_candidateApplicationCacheGroup;
	if (!group && m_applicationCache) {
	if (mainResourceApplicationCache()) {
	// Even when the main resource is being loaded from an application cache, loading can fail if aborted.
	return;
	}
	group = m_applicationCache->group();
	}

	if (group)
	group->failedLoadingMainResource(&m_documentLoader);
	}

	void ApplicationCacheHost::finishedLoadingMainResource()
	{
	ApplicationCacheGroup* group = candidateApplicationCacheGroup();
	if (!group && applicationCache() && !mainResourceApplicationCache())
	group = applicationCache()->group();

	if (group)
	group->finishedLoadingMainResource(&m_documentLoader);
	}

	bool ApplicationCacheHost::maybeLoadResource(ResourceLoader& loader, const ResourceRequest& request, const URL& originalURL)
	{
	if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request))
	return false;

	if (request.url() != originalURL)
	return false;

	ApplicationCacheResource* resource;
	if (!shouldLoadResourceFromApplicationCache(request, resource))
	return false;

	m_documentLoader.scheduleSubstituteResourceLoad(loader, *resource);
	return true;
	}

	bool ApplicationCacheHost::maybeLoadFallbackForRedirect(ResourceLoader* resourceLoader, ResourceRequest& request, const ResourceResponse& redirectResponse)
	{
	if (!redirectResponse.isNull() && !protocolHostAndPortAreEqual(request.url(), redirectResponse.url()))
	if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
	return true;
	return false;
	}

	bool ApplicationCacheHost::maybeLoadFallbackForResponse(ResourceLoader* resourceLoader, const ResourceResponse& response)
	{
	if (response.httpStatusCode() / 100 == 4 \|\| response.httpStatusCode() / 100 == 5)
	if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
	return true;
	return false;
	}

	bool ApplicationCacheHost::maybeLoadFallbackForError(ResourceLoader* resourceLoader, const ResourceError& error)
	{
	if (!error.isCancellation()) {
	if (resourceLoader == m_documentLoader.mainResourceLoader())
	return maybeLoadFallbackForMainError(resourceLoader->request(), error);
	if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
	return true;
	}
	return false;
	}

	URL ApplicationCacheHost::createFileURL(const String& path)
	{
	// FIXME: Can we just use fileURLWithFileSystemPath instead?

	// fileURLWithFileSystemPath function is not suitable because URL::setPath uses encodeWithURLEscapeSequences, which it notes
	// does not correctly escape '#' and '?'. This function works for our purposes because
	// app cache media files are always created with encodeForFileName(createCanonicalUUIDString()).

	#if USE(CF) && PLATFORM(WIN)
	RetainPtr<CFURLRef> cfURL = adoptCF(CFURLCreateWithFileSystemPath(0, path.createCFString().get(), kCFURLWindowsPathStyle, false));
	URL url(cfURL.get());
	#else
	URL url;

	url.setProtocol(ASCIILiteral("file"));
	url.setPath(path);
	#endif
	return url;
	}

	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 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();
	}
	}
	}

	bool ApplicationCacheHost::canCacheInPageCache()
	{
	return !applicationCache() && !candidateApplicationCacheGroup();
	}

	void ApplicationCacheHost::setDOMApplicationCache(DOMApplicationCache* domApplicationCache)
	{
	ASSERT(!m_domApplicationCache \|\| !domApplicationCache);
	m_domApplicationCache = domApplicationCache;
	}

	void ApplicationCacheHost::notifyDOMApplicationCache(EventID id, int total, int done)
	{
	if (id != PROGRESS_EVENT)
	InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());

	if (m_defersEvents) {
	// Event dispatching is deferred until document.onload has fired.
	m_deferredEvents.append(DeferredEvent(id, total, done));
	return;
	}
	dispatchDOMEvent(id, total, done);
	}

	void ApplicationCacheHost::stopLoadingInFrame(Frame* frame)
	{
	ASSERT(!m_applicationCache \|\| !m_candidateApplicationCacheGroup \|\| m_applicationCache->group() == m_candidateApplicationCacheGroup);

	if (m_candidateApplicationCacheGroup)
	m_candidateApplicationCacheGroup->stopLoadingInFrame(frame);
	else if (m_applicationCache)
	m_applicationCache->group()->stopLoadingInFrame(frame);
	}

	void ApplicationCacheHost::stopDeferringEvents()
	{
	Ref<DocumentLoader> protect(m_documentLoader);
	for (auto& event : m_deferredEvents)
	dispatchDOMEvent(event.eventID, event.progressTotal, event.progressDone);
	m_deferredEvents.clear();
	m_defersEvents = false;
	}

	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()));
	}
	}

	ApplicationCacheHost::CacheInfo ApplicationCacheHost::applicationCacheInfo()
	{
	ApplicationCache* cache = applicationCache();
	if (!cache \|\| !cache->isComplete())
	return CacheInfo(URL(), 0, 0, 0);

	// FIXME: Add "Creation Time" and "Update Time" to Application Caches.
	return CacheInfo(cache->manifestResource()->url(), 0, 0, cache->estimatedSizeInStorage());
	}

	void ApplicationCacheHost::dispatchDOMEvent(EventID id, int total, int done)
	{
	if (m_domApplicationCache) {
	const AtomicString& eventType = DOMApplicationCache::toEventType(id);
	RefPtr<Event> event;
	if (id == PROGRESS_EVENT)
	event = ProgressEvent::create(eventType, true, done, total);
	else
	event = Event::create(eventType, false, false);
	m_domApplicationCache->dispatchEvent(*event);
	}
	}

	void ApplicationCacheHost::setCandidateApplicationCacheGroup(ApplicationCacheGroup* group)
	{
	ASSERT(!m_applicationCache);
	m_candidateApplicationCacheGroup = group;
	}

	void ApplicationCacheHost::setApplicationCache(PassRefPtr<ApplicationCache> applicationCache)
	{
	if (m_candidateApplicationCacheGroup) {
	ASSERT(!m_applicationCache);
	m_candidateApplicationCacheGroup = nullptr;
	}

	m_applicationCache = applicationCache;
	}

	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;
	}

	bool ApplicationCacheHost::getApplicationCacheFallbackResource(const ResourceRequest& request, ApplicationCacheResource& resource, ApplicationCache cache)
	{
	if (!cache) {
	cache = applicationCache();
	if (!cache)
	return false;
	}
	if (!cache->isComplete())
	return false;

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

	URL fallbackURL;
	if (cache->isURLInOnlineWhitelist(request.url()))
	return false;
	if (!cache->urlMatchesFallbackNamespace(request.url(), &fallbackURL))
	return false;

	resource = cache->resourceForURL(fallbackURL);
	ASSERT(resource);

	return true;
	}

	bool ApplicationCacheHost::scheduleLoadFallbackResourceFromApplicationCache(ResourceLoader* loader, ApplicationCache* cache)
	{
	if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(loader->request()))
	return false;

	ApplicationCacheResource* resource;
	if (!getApplicationCacheFallbackResource(loader->request(), resource, cache))
	return false;

	loader->willSwitchToSubstituteResource();

	m_documentLoader.scheduleSubstituteResourceLoad(loader, resource);

	return true;
	}

	ApplicationCacheHost::Status ApplicationCacheHost::status() const
	{
	ApplicationCache* cache = applicationCache();
	if (!cache)
	return UNCACHED;

	switch (cache->group()->updateStatus()) {
	case ApplicationCacheGroup::Checking:
	return CHECKING;
	case ApplicationCacheGroup::Downloading:
	return DOWNLOADING;
	case ApplicationCacheGroup::Idle: {
	if (cache->group()->isObsolete())
	return OBSOLETE;
	if (cache != cache->group()->newestCache())
	return UPDATEREADY;
	return IDLE;
	}
	}

	ASSERT_NOT_REACHED();
	return UNCACHED;
	}

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

	bool ApplicationCacheHost::swapCache()
	{
	ApplicationCache* cache = applicationCache();
	if (!cache)
	return false;

	// If the group of application caches to which cache belongs has the lifecycle status obsolete, unassociate document from cache.
	if (cache->group()->isObsolete()) {
	cache->group()->disassociateDocumentLoader(&m_documentLoader);
	return true;
	}

	// If there is no newer cache, raise an INVALID_STATE_ERR exception.
	ApplicationCache* newestCache = cache->group()->newestCache();
	if (cache == newestCache)
	return false;

	ASSERT(cache->group() == newestCache->group());
	setApplicationCache(newestCache);
	InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());
	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());
	}
	}

	bool ApplicationCacheHost::isApplicationCacheEnabled()
	{
	return m_documentLoader.frame() && m_documentLoader.frame()->settings().offlineWebApplicationCacheEnabled() && !m_documentLoader.frame()->page()->usesEphemeralSession();
	}

	bool ApplicationCacheHost::isApplicationCacheBlockedForRequest(const ResourceRequest& request)
	{
	Frame* frame = m_documentLoader.frame();
	if (!frame)
	return false;

	if (frame->isMainFrame())
	return false;

	Ref<SecurityOrigin> origin(SecurityOrigin::create(request.url()));
	return !origin.get().canAccessApplicationCache(frame->document()->topOrigin());
	}

	} // namespace WebCore