Source/WebCore/loader/appcache/ApplicationCacheHost.cpp - 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 "EventNames.h"
 #include "FileSystem.h"
 #include "Frame.h"
 #include "FrameLoader.h"
 #include "FrameLoaderClient.h"
 #include "InspectorInstrumentation.h"
 #include "Page.h"
 #include "ProgressEvent.h"
 #include "ResourceHandle.h"
 #include "ResourceRequest.h"
 #include "Settings.h"
 #include "SubresourceLoader.h"
 #include <wtf/UUID.h>

 namespace WebCore {

 ApplicationCacheHost::ApplicationCacheHost(DocumentLoader& documentLoader)
     : m_documentLoader(documentLoader)
 {
 }

 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()
 {
     ASSERT(m_documentLoader.frame());
     ApplicationCacheGroup::selectCacheWithoutManifestURL(*m_documentLoader.frame());
 }

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

 void ApplicationCacheHost::maybeLoadMainResource(const 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(const 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)
 {
 }

 void ApplicationCacheHost::failedLoadingMainResource()
 {
     auto* 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()
 {
     auto* 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 (loader.options().applicationCacheMode != ApplicationCacheMode::Use)
         return false;

     if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request))
         return false;

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

 #if ENABLE(SERVICE_WORKER)
     if (loader.options().serviceWorkerRegistrationIdentifier)
         return false;
 #endif

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

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

 bool ApplicationCacheHost::maybeLoadFallbackForRedirect(ResourceLoader* resourceLoader, ResourceRequest& request, const ResourceResponse& redirectResponse)
 {
     if (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
         return false;

     if (!redirectResponse.isNull() && !protocolHostAndPortAreEqual(request.url(), redirectResponse.url())) {
         if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
             return true;
     }
     return false;
 }

 bool ApplicationCacheHost::maybeLoadFallbackForResponse(ResourceLoader* resourceLoader, const ResourceResponse& response)
 {
     if (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
         return false;

     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 (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
         return false;

     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?
 #if USE(CF) && PLATFORM(WIN)
     URL url(adoptCF(CFURLCreateWithFileSystemPath(0, path.createCFString().get(), kCFURLWindowsPathStyle, false)).get());
 #else
     URL url;
     url.setProtocol(ASCIILiteral("file"));
     url.setPath(path);
 #endif
     return url;
 }

 static inline RefPtr<SharedBuffer> bufferFromResource(ApplicationCacheResource& resource)
 {
     // FIXME: Clients probably 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())
         return resource.data().copy();
     return SharedBuffer::createWithContentsOfFile(resource.path());
 }

 bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, RefPtr<SharedBuffer>& data)
 {
     ApplicationCacheResource* resource;
     if (!shouldLoadResourceFromApplicationCache(request, resource))
         return false;

     auto responseData = resource ? bufferFromResource(*resource) : nullptr;
     if (!responseData) {
         error = m_documentLoader.frameLoader()->client().cannotShowURLError(request);
         return true;
     }

     response = resource->response();
     data = WTFMove(responseData);
     return true;
 }

 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(const AtomicString& eventType, int total, int done)
 {
     if (eventType != eventNames().progressEvent)
         InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());

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

     dispatchDOMEvent(eventType, 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);

     // Note, do not cache the size in a local variable.
     // This code needs to properly handle the case where more events are added to
     // m_deferredEvents while iterating it. This is why we don't use a modern for loop.
     for (size_t i = 0; i < m_deferredEvents.size(); ++i) {
         auto& event = m_deferredEvents[i];
         dispatchDOMEvent(event.eventType, event.progressTotal, event.progressDone);
     }

     m_deferredEvents.clear();
     m_defersEvents = false;
 }

 Vector<ApplicationCacheHost::ResourceInfo> ApplicationCacheHost::resourceList()
 {
     auto* cache = applicationCache();
     if (!cache || !cache->isComplete())
         return { };

     return WTF::map(cache->resources(), [] (auto& urlAndResource) -> ApplicationCacheHost::ResourceInfo {
         ASSERT(urlAndResource.value);
         auto& 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;

         return { resource.url(), isMaster, isManifest, isFallback, isForeign, isExplicit, resource.estimatedSizeInStorage() };
     });
 }

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

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

 static Ref<Event> createApplicationCacheEvent(const AtomicString& eventType, int total, int done)
 {
     if (eventType == eventNames().progressEvent)
         return ProgressEvent::create(eventType, true, done, total);
     return Event::create(eventType, false, false);
 }

 void ApplicationCacheHost::dispatchDOMEvent(const AtomicString& eventType, int total, int done)
 {
     if (!m_domApplicationCache)
         return;
     m_domApplicationCache->dispatchEvent(createApplicationCacheEvent(eventType, total, done));
 }

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

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

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

     ResourceRequest request(originalRequest);
     if (auto* loaderFrame = m_documentLoader.frame()) {
         if (auto* 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 (!loader)
         return false;

     if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(loader->request()))
         return false;

 #if ENABLE(SERVICE_WORKER)
     if (loader->options().serviceWorkerRegistrationIdentifier)
         return false;
 #endif

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

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

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

 bool ApplicationCacheHost::swapCache()
 {
     auto* 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 InvalidStateError exception.
     auto* 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()
 {
     auto* frame = m_documentLoader.frame();
     if (!frame)
         return;
     if (auto* cacheGroup = candidateApplicationCacheGroup())
         cacheGroup->abort(*frame);
     else if (auto* cache = applicationCache())
         cache->group()->abort(*frame);
 }

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

 bool ApplicationCacheHost::isApplicationCacheBlockedForRequest(const ResourceRequest& request)
 {
     auto* frame = m_documentLoader.frame();
     if (!frame)
         return false;
     if (frame->isMainFrame())
         return false;
     return !SecurityOrigin::create(request.url())->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 "EventNames.h"
	#include "FileSystem.h"
	#include "Frame.h"
	#include "FrameLoader.h"
	#include "FrameLoaderClient.h"
	#include "InspectorInstrumentation.h"
	#include "Page.h"
	#include "ProgressEvent.h"
	#include "ResourceHandle.h"
	#include "ResourceRequest.h"
	#include "Settings.h"
	#include "SubresourceLoader.h"
	#include <wtf/UUID.h>

	namespace WebCore {

	ApplicationCacheHost::ApplicationCacheHost(DocumentLoader& documentLoader)
	: m_documentLoader(documentLoader)
	{
	}

	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()
	{
	ASSERT(m_documentLoader.frame());
	ApplicationCacheGroup::selectCacheWithoutManifestURL(*m_documentLoader.frame());
	}

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

	void ApplicationCacheHost::maybeLoadMainResource(const 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(const 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)
	{
	}

	void ApplicationCacheHost::failedLoadingMainResource()
	{
	auto* 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()
	{
	auto* 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 (loader.options().applicationCacheMode != ApplicationCacheMode::Use)
	return false;

	if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request))
	return false;

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

	#if ENABLE(SERVICE_WORKER)
	if (loader.options().serviceWorkerRegistrationIdentifier)
	return false;
	#endif

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

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

	bool ApplicationCacheHost::maybeLoadFallbackForRedirect(ResourceLoader* resourceLoader, ResourceRequest& request, const ResourceResponse& redirectResponse)
	{
	if (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
	return false;

	if (!redirectResponse.isNull() && !protocolHostAndPortAreEqual(request.url(), redirectResponse.url())) {
	if (scheduleLoadFallbackResourceFromApplicationCache(resourceLoader))
	return true;
	}
	return false;
	}

	bool ApplicationCacheHost::maybeLoadFallbackForResponse(ResourceLoader* resourceLoader, const ResourceResponse& response)
	{
	if (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
	return false;

	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 (resourceLoader && resourceLoader->options().applicationCacheMode != ApplicationCacheMode::Use)
	return false;

	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?
	#if USE(CF) && PLATFORM(WIN)
	URL url(adoptCF(CFURLCreateWithFileSystemPath(0, path.createCFString().get(), kCFURLWindowsPathStyle, false)).get());
	#else
	URL url;
	url.setProtocol(ASCIILiteral("file"));
	url.setPath(path);
	#endif
	return url;
	}

	static inline RefPtr<SharedBuffer> bufferFromResource(ApplicationCacheResource& resource)
	{
	// FIXME: Clients probably 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())
	return resource.data().copy();
	return SharedBuffer::createWithContentsOfFile(resource.path());
	}

	bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, RefPtr<SharedBuffer>& data)
	{
	ApplicationCacheResource* resource;
	if (!shouldLoadResourceFromApplicationCache(request, resource))
	return false;

	auto responseData = resource ? bufferFromResource(*resource) : nullptr;
	if (!responseData) {
	error = m_documentLoader.frameLoader()->client().cannotShowURLError(request);
	return true;
	}

	response = resource->response();
	data = WTFMove(responseData);
	return true;
	}

	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(const AtomicString& eventType, int total, int done)
	{
	if (eventType != eventNames().progressEvent)
	InspectorInstrumentation::updateApplicationCacheStatus(m_documentLoader.frame());

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

	dispatchDOMEvent(eventType, 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);

	// Note, do not cache the size in a local variable.
	// This code needs to properly handle the case where more events are added to
	// m_deferredEvents while iterating it. This is why we don't use a modern for loop.
	for (size_t i = 0; i < m_deferredEvents.size(); ++i) {
	auto& event = m_deferredEvents[i];
	dispatchDOMEvent(event.eventType, event.progressTotal, event.progressDone);
	}

	m_deferredEvents.clear();
	m_defersEvents = false;
	}

	Vector<ApplicationCacheHost::ResourceInfo> ApplicationCacheHost::resourceList()
	{
	auto* cache = applicationCache();
	if (!cache \|\| !cache->isComplete())
	return { };

	return WTF::map(cache->resources(), [] (auto& urlAndResource) -> ApplicationCacheHost::ResourceInfo {
	ASSERT(urlAndResource.value);
	auto& 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;

	return { resource.url(), isMaster, isManifest, isFallback, isForeign, isExplicit, resource.estimatedSizeInStorage() };
	});
	}

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

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

	static Ref<Event> createApplicationCacheEvent(const AtomicString& eventType, int total, int done)
	{
	if (eventType == eventNames().progressEvent)
	return ProgressEvent::create(eventType, true, done, total);
	return Event::create(eventType, false, false);
	}

	void ApplicationCacheHost::dispatchDOMEvent(const AtomicString& eventType, int total, int done)
	{
	if (!m_domApplicationCache)
	return;
	m_domApplicationCache->dispatchEvent(createApplicationCacheEvent(eventType, total, done));
	}

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

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

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

	ResourceRequest request(originalRequest);
	if (auto* loaderFrame = m_documentLoader.frame()) {
	if (auto* 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 (!loader)
	return false;

	if (!isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(loader->request()))
	return false;

	#if ENABLE(SERVICE_WORKER)
	if (loader->options().serviceWorkerRegistrationIdentifier)
	return false;
	#endif

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

	loader->willSwitchToSubstituteResource();
	m_documentLoader.scheduleSubstituteResourceLoad(loader, resource);
	return true;
	}

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

	bool ApplicationCacheHost::swapCache()
	{
	auto* 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 InvalidStateError exception.
	auto* 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()
	{
	auto* frame = m_documentLoader.frame();
	if (!frame)
	return;
	if (auto* cacheGroup = candidateApplicationCacheGroup())
	cacheGroup->abort(*frame);
	else if (auto* cache = applicationCache())
	cache->group()->abort(*frame);
	}

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

	bool ApplicationCacheHost::isApplicationCacheBlockedForRequest(const ResourceRequest& request)
	{
	auto* frame = m_documentLoader.frame();
	if (!frame)
	return false;
	if (frame->isMainFrame())
	return false;
	return !SecurityOrigin::create(request.url())->canAccessApplicationCache(frame->document()->topOrigin());
	}

	} // namespace WebCore