blob: aa54541d534ec1a2cb58ad000a33cdba34d6064e [file] [log] [blame]
/*
Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
Copyright (C) 2004-2011, 2014 Apple Inc. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "CachedResource.h"
#include "CachedResourceClient.h"
#include "CachedResourceClientWalker.h"
#include "CachedResourceHandle.h"
#include "CachedResourceLoader.h"
#include "CrossOriginAccessControl.h"
#include "DiagnosticLoggingClient.h"
#include "DiagnosticLoggingKeys.h"
#include "Document.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "HTTPHeaderNames.h"
#include "InspectorInstrumentation.h"
#include "LoaderStrategy.h"
#include "Logging.h"
#include "MemoryCache.h"
#include "PlatformStrategies.h"
#include "ProgressTracker.h"
#include "ResourceHandle.h"
#include "SchemeRegistry.h"
#include "SecurityOrigin.h"
#include "SubresourceLoader.h"
#include "URL.h"
#include <wtf/CompletionHandler.h>
#include <wtf/MathExtras.h>
#include <wtf/RefCountedLeakCounter.h>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
#include <wtf/text/CString.h>
#if USE(QUICK_LOOK)
#include "QuickLook.h"
#endif
#define RELEASE_LOG_IF_ALLOWED(fmt, ...) RELEASE_LOG_IF(cachedResourceLoader.isAlwaysOnLoggingAllowed(), Network, "%p - CachedResource::" fmt, this, ##__VA_ARGS__)
namespace WebCore {
using namespace WTF;
ResourceLoadPriority CachedResource::defaultPriorityForResourceType(Type type)
{
switch (type) {
case CachedResource::MainResource:
return ResourceLoadPriority::VeryHigh;
case CachedResource::CSSStyleSheet:
case CachedResource::Script:
return ResourceLoadPriority::High;
#if ENABLE(SVG_FONTS)
case CachedResource::SVGFontResource:
#endif
case CachedResource::MediaResource:
case CachedResource::FontResource:
case CachedResource::RawResource:
case CachedResource::Icon:
return ResourceLoadPriority::Medium;
case CachedResource::ImageResource:
return ResourceLoadPriority::Low;
#if ENABLE(XSLT)
case CachedResource::XSLStyleSheet:
return ResourceLoadPriority::High;
#endif
case CachedResource::SVGDocumentResource:
return ResourceLoadPriority::Low;
case CachedResource::Beacon:
return ResourceLoadPriority::VeryLow;
case CachedResource::LinkPrefetch:
return ResourceLoadPriority::VeryLow;
#if ENABLE(VIDEO_TRACK)
case CachedResource::TextTrackResource:
return ResourceLoadPriority::Low;
#endif
#if ENABLE(APPLICATION_MANIFEST)
case CachedResource::ApplicationManifest:
return ResourceLoadPriority::Low;
#endif
}
ASSERT_NOT_REACHED();
return ResourceLoadPriority::Low;
}
static Seconds deadDecodedDataDeletionIntervalForResourceType(CachedResource::Type type)
{
if (type == CachedResource::Script)
return 0_s;
return MemoryCache::singleton().deadDecodedDataDeletionInterval();
}
DEFINE_DEBUG_ONLY_GLOBAL(RefCountedLeakCounter, cachedResourceLeakCounter, ("CachedResource"));
CachedResource::CachedResource(CachedResourceRequest&& request, Type type, PAL::SessionID sessionID)
: m_resourceRequest(request.releaseResourceRequest())
, m_options(request.options())
, m_decodedDataDeletionTimer(*this, &CachedResource::destroyDecodedData, deadDecodedDataDeletionIntervalForResourceType(type))
, m_sessionID(sessionID)
, m_loadPriority(defaultPriorityForResourceType(type))
, m_responseTimestamp(WallTime::now())
, m_fragmentIdentifierForRequest(request.releaseFragmentIdentifier())
, m_origin(request.releaseOrigin())
, m_initiatorName(request.initiatorName())
, m_isLinkPreload(request.isLinkPreload())
, m_hasUnknownEncoding(request.isLinkPreload())
, m_type(type)
, m_ignoreForRequestCount(request.ignoreForRequestCount())
{
ASSERT(sessionID.isValid());
setLoadPriority(request.priority());
#ifndef NDEBUG
cachedResourceLeakCounter.increment();
#endif
// FIXME: We should have a better way of checking for Navigation loads, maybe FetchMode::Options::Navigate.
ASSERT(m_origin || m_type == CachedResource::MainResource);
if (isRequestCrossOrigin(m_origin.get(), m_resourceRequest.url(), m_options))
setCrossOrigin();
}
// FIXME: For this constructor, we should probably mandate that the URL has no fragment identifier.
CachedResource::CachedResource(const URL& url, Type type, PAL::SessionID sessionID)
: m_resourceRequest(url)
, m_decodedDataDeletionTimer(*this, &CachedResource::destroyDecodedData, deadDecodedDataDeletionIntervalForResourceType(type))
, m_sessionID(sessionID)
, m_responseTimestamp(WallTime::now())
, m_fragmentIdentifierForRequest(CachedResourceRequest::splitFragmentIdentifierFromRequestURL(m_resourceRequest))
, m_type(type)
, m_status(Cached)
{
ASSERT(sessionID.isValid());
#ifndef NDEBUG
cachedResourceLeakCounter.increment();
#endif
}
CachedResource::~CachedResource()
{
ASSERT(!m_resourceToRevalidate); // Should be true because canDelete() checks this.
ASSERT(canDelete());
ASSERT(!inCache());
ASSERT(!m_deleted);
ASSERT(url().isNull() || !allowsCaching() || MemoryCache::singleton().resourceForRequest(resourceRequest(), sessionID()) != this);
#ifndef NDEBUG
m_deleted = true;
cachedResourceLeakCounter.decrement();
#endif
if (m_owningCachedResourceLoader)
m_owningCachedResourceLoader->removeCachedResource(*this);
}
void CachedResource::failBeforeStarting()
{
// FIXME: What if resources in other frames were waiting for this revalidation?
LOG(ResourceLoading, "Cannot start loading '%s'", url().string().latin1().data());
if (allowsCaching() && m_resourceToRevalidate)
MemoryCache::singleton().revalidationFailed(*this);
error(CachedResource::LoadError);
}
void CachedResource::load(CachedResourceLoader& cachedResourceLoader)
{
if (!cachedResourceLoader.frame()) {
RELEASE_LOG_IF_ALLOWED("load: No associated frame");
failBeforeStarting();
return;
}
Frame& frame = *cachedResourceLoader.frame();
// Prevent new loads if we are in the PageCache or being added to the PageCache.
// We query the top document because new frames may be created in pagehide event handlers
// and their pageCacheState will not reflect the fact that they are about to enter page
// cache.
if (auto* topDocument = frame.mainFrame().document()) {
if (topDocument->pageCacheState() != Document::NotInPageCache) {
RELEASE_LOG_IF_ALLOWED("load: Already in page cache or being added to it (frame = %p)", &frame);
failBeforeStarting();
return;
}
}
FrameLoader& frameLoader = frame.loader();
if (m_options.securityCheck == DoSecurityCheck && (frameLoader.state() == FrameStateProvisional || !frameLoader.activeDocumentLoader() || frameLoader.activeDocumentLoader()->isStopping())) {
if (frameLoader.state() == FrameStateProvisional)
RELEASE_LOG_IF_ALLOWED("load: Failed security check -- state is provisional (frame = %p)", &frame);
else if (!frameLoader.activeDocumentLoader())
RELEASE_LOG_IF_ALLOWED("load: Failed security check -- not active document (frame = %p)", &frame);
else if (frameLoader.activeDocumentLoader()->isStopping())
RELEASE_LOG_IF_ALLOWED("load: Failed security check -- active loader is stopping (frame = %p)", &frame);
failBeforeStarting();
return;
}
m_loading = true;
if (isCacheValidator()) {
CachedResource* resourceToRevalidate = m_resourceToRevalidate;
ASSERT(resourceToRevalidate->canUseCacheValidator());
ASSERT(resourceToRevalidate->isLoaded());
const String& lastModified = resourceToRevalidate->response().httpHeaderField(HTTPHeaderName::LastModified);
const String& eTag = resourceToRevalidate->response().httpHeaderField(HTTPHeaderName::ETag);
if (!lastModified.isEmpty() || !eTag.isEmpty()) {
ASSERT(cachedResourceLoader.cachePolicy(type(), url()) != CachePolicyReload);
if (cachedResourceLoader.cachePolicy(type(), url()) == CachePolicyRevalidate)
m_resourceRequest.setHTTPHeaderField(HTTPHeaderName::CacheControl, "max-age=0");
if (!lastModified.isEmpty())
m_resourceRequest.setHTTPHeaderField(HTTPHeaderName::IfModifiedSince, lastModified);
if (!eTag.isEmpty())
m_resourceRequest.setHTTPHeaderField(HTTPHeaderName::IfNoneMatch, eTag);
}
}
if (type() == CachedResource::LinkPrefetch)
m_resourceRequest.setHTTPHeaderField(HTTPHeaderName::Purpose, "prefetch");
m_resourceRequest.setPriority(loadPriority());
// Navigation algorithm is setting up the request before sending it to CachedResourceLoader?CachedResource.
// So no need for extra fields for MainResource.
if (type() != CachedResource::MainResource)
frameLoader.addExtraFieldsToSubresourceRequest(m_resourceRequest);
// FIXME: It's unfortunate that the cache layer and below get to know anything about fragment identifiers.
// We should look into removing the expectation of that knowledge from the platform network stacks.
ResourceRequest request(m_resourceRequest);
if (!m_fragmentIdentifierForRequest.isNull()) {
URL url = request.url();
url.setFragmentIdentifier(m_fragmentIdentifierForRequest);
request.setURL(url);
m_fragmentIdentifierForRequest = String();
}
if (m_options.keepAlive) {
if (!cachedResourceLoader.keepaliveRequestTracker().tryRegisterRequest(*this)) {
setResourceError({ errorDomainWebKitInternal, 0, request.url(), ASCIILiteral("Reached maximum amount of queued data of 64Kb for keepalive requests"), ResourceError::Type::AccessControl });
failBeforeStarting();
return;
}
// FIXME: We should not special-case Beacon here.
if (shouldUsePingLoad(type())) {
ASSERT(m_originalRequest);
CachedResourceHandle<CachedResource> protectedThis(this);
// FIXME: Move beacon loads to normal subresource loading to get normal inspector request instrumentation hooks.
unsigned long identifier = frame.page()->progress().createUniqueIdentifier();
InspectorInstrumentation::willSendRequestOfType(&frame, identifier, frameLoader.activeDocumentLoader(), request, InspectorInstrumentation::LoadType::Beacon);
platformStrategies()->loaderStrategy()->startPingLoad(frame, request, m_originalRequest->httpHeaderFields(), m_options, [this, protectedThis = WTFMove(protectedThis), protectedFrame = makeRef(frame), identifier] (const ResourceError& error, const ResourceResponse& response) {
if (!response.isNull())
InspectorInstrumentation::didReceiveResourceResponse(protectedFrame, identifier, protectedFrame->loader().activeDocumentLoader(), response, nullptr);
if (error.isNull()) {
finishLoading(nullptr);
NetworkLoadMetrics emptyMetrics;
InspectorInstrumentation::didFinishLoading(protectedFrame.ptr(), protectedFrame->loader().activeDocumentLoader(), identifier, emptyMetrics, nullptr);
} else {
setResourceError(error);
this->error(LoadError);
InspectorInstrumentation::didFailLoading(protectedFrame.ptr(), protectedFrame->loader().activeDocumentLoader(), identifier, error);
}
});
return;
}
}
platformStrategies()->loaderStrategy()->loadResource(frame, *this, WTFMove(request), m_options, [this, protectedThis = CachedResourceHandle<CachedResource>(this), frame = makeRef(frame), loggingAllowed = cachedResourceLoader.isAlwaysOnLoggingAllowed()] (RefPtr<SubresourceLoader>&& loader) {
m_loader = WTFMove(loader);
if (!m_loader) {
RELEASE_LOG_IF(loggingAllowed, Network, "%p - CachedResource::load: Unable to create SubresourceLoader (frame = %p)", this, frame.ptr());
failBeforeStarting();
return;
}
m_status = Pending;
});
}
void CachedResource::loadFrom(const CachedResource& resource)
{
ASSERT(url() == resource.url());
ASSERT(type() == resource.type());
ASSERT(resource.status() == Status::Cached);
if (isCrossOrigin() && m_options.mode == FetchOptions::Mode::Cors) {
ASSERT(m_origin);
String errorMessage;
if (!WebCore::passesAccessControlCheck(resource.response(), m_options.storedCredentialsPolicy, *m_origin, errorMessage)) {
setResourceError(ResourceError(String(), 0, url(), errorMessage, ResourceError::Type::AccessControl));
return;
}
}
setBodyDataFrom(resource);
setStatus(Status::Cached);
setLoading(false);
}
void CachedResource::setBodyDataFrom(const CachedResource& resource)
{
m_data = resource.m_data;
m_response = resource.m_response;
m_response.setTainting(m_responseTainting);
setDecodedSize(resource.decodedSize());
setEncodedSize(resource.encodedSize());
}
void CachedResource::checkNotify()
{
if (isLoading() || stillNeedsLoad())
return;
CachedResourceClientWalker<CachedResourceClient> walker(m_clients);
while (CachedResourceClient* client = walker.next())
client->notifyFinished(*this);
}
void CachedResource::updateBuffer(SharedBuffer&)
{
ASSERT(dataBufferingPolicy() == BufferData);
}
void CachedResource::updateData(const char*, unsigned)
{
ASSERT(dataBufferingPolicy() == DoNotBufferData);
}
void CachedResource::finishLoading(SharedBuffer*)
{
setLoading(false);
checkNotify();
}
void CachedResource::error(CachedResource::Status status)
{
setStatus(status);
ASSERT(errorOccurred());
m_data = nullptr;
setLoading(false);
checkNotify();
}
void CachedResource::cancelLoad()
{
if (!isLoading() && !stillNeedsLoad())
return;
setStatus(LoadError);
setLoading(false);
checkNotify();
}
void CachedResource::finish()
{
if (!errorOccurred())
m_status = Cached;
}
void CachedResource::setCrossOrigin()
{
ASSERT(m_options.mode != FetchOptions::Mode::SameOrigin);
m_responseTainting = (m_options.mode == FetchOptions::Mode::Cors) ? ResourceResponse::Tainting::Cors : ResourceResponse::Tainting::Opaque;
}
bool CachedResource::isCrossOrigin() const
{
return m_responseTainting != ResourceResponse::Tainting::Basic;
}
bool CachedResource::isCORSSameOrigin() const
{
// Following resource types do not use CORS
ASSERT(type() != CachedResource::Type::FontResource);
#if ENABLE(SVG_FONTS)
ASSERT(type() != CachedResource::Type::SVGFontResource);
#endif
#if ENABLE(XSLT)
ASSERT(type() != CachedResource::XSLStyleSheet);
#endif
// https://html.spec.whatwg.org/multipage/infrastructure.html#cors-same-origin
return !loadFailedOrCanceled() && m_responseTainting != ResourceResponse::Tainting::Opaque;
}
bool CachedResource::isExpired() const
{
if (m_response.isNull())
return false;
return computeCurrentAge(m_response, m_responseTimestamp) > freshnessLifetime(m_response);
}
static inline bool shouldCacheSchemeIndefinitely(StringView scheme)
{
#if PLATFORM(COCOA)
if (equalLettersIgnoringASCIICase(scheme, "applewebdata"))
return true;
#endif
#if USE(SOUP)
if (equalLettersIgnoringASCIICase(scheme, "resource"))
return true;
#endif
return equalLettersIgnoringASCIICase(scheme, "data");
}
Seconds CachedResource::freshnessLifetime(const ResourceResponse& response) const
{
if (!response.url().protocolIsInHTTPFamily()) {
StringView protocol = response.url().protocol();
if (!shouldCacheSchemeIndefinitely(protocol)) {
// Don't cache non-HTTP main resources since we can't check for freshness.
// FIXME: We should not cache subresources either, but when we tried this
// it caused performance and flakiness issues in our test infrastructure.
if (m_type == MainResource || SchemeRegistry::shouldAlwaysRevalidateURLScheme(protocol.toStringWithoutCopying()))
return 0_us;
}
return Seconds::infinity();
}
return computeFreshnessLifetimeForHTTPFamily(response, m_responseTimestamp);
}
void CachedResource::redirectReceived(ResourceRequest&& request, const ResourceResponse& response, CompletionHandler<void(ResourceRequest&&)>&& completionHandler)
{
m_requestedFromNetworkingLayer = true;
if (response.isNull())
return completionHandler(WTFMove(request));
updateRedirectChainStatus(m_redirectChainCacheStatus, response);
completionHandler(WTFMove(request));
}
void CachedResource::setResponse(const ResourceResponse& response)
{
ASSERT(m_response.type() == ResourceResponse::Type::Default);
m_response = response;
m_varyingHeaderValues = collectVaryingRequestHeaders(m_resourceRequest, m_response, m_sessionID);
#if ENABLE(SERVICE_WORKER)
if (m_response.source() == ResourceResponse::Source::ServiceWorker) {
m_responseTainting = m_response.tainting();
return;
}
#endif
m_response.setRedirected(m_redirectChainCacheStatus.status != RedirectChainCacheStatus::NoRedirection);
if (m_response.tainting() == ResourceResponse::Tainting::Basic || m_response.tainting() == ResourceResponse::Tainting::Cors)
m_response.setTainting(m_responseTainting);
}
void CachedResource::responseReceived(const ResourceResponse& response)
{
setResponse(response);
m_responseTimestamp = WallTime::now();
String encoding = response.textEncodingName();
if (!encoding.isNull())
setEncoding(encoding);
}
void CachedResource::clearLoader()
{
ASSERT(m_loader);
m_identifierForLoadWithoutResourceLoader = m_loader->identifier();
m_loader = nullptr;
deleteIfPossible();
}
void CachedResource::addClient(CachedResourceClient& client)
{
if (addClientToSet(client))
didAddClient(client);
}
void CachedResource::didAddClient(CachedResourceClient& client)
{
if (m_decodedDataDeletionTimer.isActive())
m_decodedDataDeletionTimer.stop();
if (m_clientsAwaitingCallback.remove(&client))
m_clients.add(&client);
if (!isLoading() && !stillNeedsLoad())
client.notifyFinished(*this);
}
bool CachedResource::addClientToSet(CachedResourceClient& client)
{
if (m_preloadResult == PreloadNotReferenced && client.shouldMarkAsReferenced()) {
if (isLoaded())
m_preloadResult = PreloadReferencedWhileComplete;
else if (m_requestedFromNetworkingLayer)
m_preloadResult = PreloadReferencedWhileLoading;
else
m_preloadResult = PreloadReferenced;
}
if (allowsCaching() && !hasClients() && inCache())
MemoryCache::singleton().addToLiveResourcesSize(*this);
if ((m_type == RawResource || m_type == MainResource) && !m_response.isNull() && !m_proxyResource) {
// Certain resources (especially XHRs and main resources) do crazy things if an asynchronous load returns
// synchronously (e.g., scripts may not have set all the state they need to handle the load).
// Therefore, rather than immediately sending callbacks on a cache hit like other CachedResources,
// we schedule the callbacks and ensure we never finish synchronously.
ASSERT(!m_clientsAwaitingCallback.contains(&client));
m_clientsAwaitingCallback.add(&client, std::make_unique<Callback>(*this, client));
return false;
}
m_clients.add(&client);
return true;
}
void CachedResource::removeClient(CachedResourceClient& client)
{
auto callback = m_clientsAwaitingCallback.take(&client);
if (callback) {
ASSERT(!m_clients.contains(&client));
callback->cancel();
callback = nullptr;
} else {
ASSERT(m_clients.contains(&client));
m_clients.remove(&client);
didRemoveClient(client);
}
if (deleteIfPossible()) {
// `this` object is dead here.
return;
}
if (hasClients())
return;
auto& memoryCache = MemoryCache::singleton();
if (allowsCaching() && inCache()) {
memoryCache.removeFromLiveResourcesSize(*this);
memoryCache.removeFromLiveDecodedResourcesList(*this);
}
if (!m_switchingClientsToRevalidatedResource)
allClientsRemoved();
destroyDecodedDataIfNeeded();
if (!allowsCaching())
return;
if (response().cacheControlContainsNoStore() && url().protocolIs("https")) {
// RFC2616 14.9.2:
// "no-store: ... MUST make a best-effort attempt to remove the information from volatile storage as promptly as possible"
// "... History buffers MAY store such responses as part of their normal operation."
// We allow non-secure content to be reused in history, but we do not allow secure content to be reused.
memoryCache.remove(*this);
}
memoryCache.pruneSoon();
}
void CachedResource::allClientsRemoved()
{
if (isLinkPreload() && m_loader)
m_loader->cancelIfNotFinishing();
}
void CachedResource::destroyDecodedDataIfNeeded()
{
if (!m_decodedSize)
return;
if (!MemoryCache::singleton().deadDecodedDataDeletionInterval())
return;
m_decodedDataDeletionTimer.restart();
}
void CachedResource::decodedDataDeletionTimerFired()
{
destroyDecodedData();
}
bool CachedResource::deleteIfPossible()
{
if (canDelete()) {
if (!inCache()) {
InspectorInstrumentation::willDestroyCachedResource(*this);
delete this;
return true;
}
if (m_data)
m_data->hintMemoryNotNeededSoon();
}
return false;
}
void CachedResource::setDecodedSize(unsigned size)
{
if (size == m_decodedSize)
return;
long long delta = static_cast<long long>(size) - m_decodedSize;
// The object must be moved to a different queue, since its size has been changed.
// Remove before updating m_decodedSize, so we find the resource in the correct LRU list.
if (allowsCaching() && inCache())
MemoryCache::singleton().removeFromLRUList(*this);
m_decodedSize = size;
if (allowsCaching() && inCache()) {
auto& memoryCache = MemoryCache::singleton();
// Now insert into the new LRU list.
memoryCache.insertInLRUList(*this);
// Insert into or remove from the live decoded list if necessary.
// When inserting into the LiveDecodedResourcesList it is possible
// that the m_lastDecodedAccessTime is still zero or smaller than
// the m_lastDecodedAccessTime of the current list head. This is a
// violation of the invariant that the list is to be kept sorted
// by access time. The weakening of the invariant does not pose
// a problem. For more details please see: https://bugs.webkit.org/show_bug.cgi?id=30209
bool inLiveDecodedResourcesList = memoryCache.inLiveDecodedResourcesList(*this);
if (m_decodedSize && !inLiveDecodedResourcesList && hasClients())
memoryCache.insertInLiveDecodedResourcesList(*this);
else if (!m_decodedSize && inLiveDecodedResourcesList)
memoryCache.removeFromLiveDecodedResourcesList(*this);
// Update the cache's size totals.
memoryCache.adjustSize(hasClients(), delta);
}
}
void CachedResource::setEncodedSize(unsigned size)
{
if (size == m_encodedSize)
return;
long long delta = static_cast<long long>(size) - m_encodedSize;
// The object must be moved to a different queue, since its size has been changed.
// Remove before updating m_encodedSize, so we find the resource in the correct LRU list.
if (allowsCaching() && inCache())
MemoryCache::singleton().removeFromLRUList(*this);
m_encodedSize = size;
if (allowsCaching() && inCache()) {
auto& memoryCache = MemoryCache::singleton();
memoryCache.insertInLRUList(*this);
memoryCache.adjustSize(hasClients(), delta);
}
}
void CachedResource::didAccessDecodedData(MonotonicTime timeStamp)
{
m_lastDecodedAccessTime = timeStamp;
if (allowsCaching() && inCache()) {
auto& memoryCache = MemoryCache::singleton();
if (memoryCache.inLiveDecodedResourcesList(*this)) {
memoryCache.removeFromLiveDecodedResourcesList(*this);
memoryCache.insertInLiveDecodedResourcesList(*this);
}
memoryCache.pruneSoon();
}
}
void CachedResource::setResourceToRevalidate(CachedResource* resource)
{
ASSERT(resource);
ASSERT(!m_resourceToRevalidate);
ASSERT(resource != this);
ASSERT(m_handlesToRevalidate.isEmpty());
ASSERT(resource->type() == type());
ASSERT(!resource->m_proxyResource);
LOG(ResourceLoading, "CachedResource %p setResourceToRevalidate %p", this, resource);
resource->m_proxyResource = this;
m_resourceToRevalidate = resource;
}
void CachedResource::clearResourceToRevalidate()
{
ASSERT(m_resourceToRevalidate);
ASSERT(m_resourceToRevalidate->m_proxyResource == this);
if (m_switchingClientsToRevalidatedResource)
return;
m_resourceToRevalidate->m_proxyResource = nullptr;
m_resourceToRevalidate->deleteIfPossible();
m_handlesToRevalidate.clear();
m_resourceToRevalidate = nullptr;
deleteIfPossible();
}
void CachedResource::switchClientsToRevalidatedResource()
{
ASSERT(m_resourceToRevalidate);
ASSERT(m_resourceToRevalidate->inCache());
ASSERT(!inCache());
LOG(ResourceLoading, "CachedResource %p switchClientsToRevalidatedResource %p", this, m_resourceToRevalidate);
m_switchingClientsToRevalidatedResource = true;
for (auto& handle : m_handlesToRevalidate) {
handle->m_resource = m_resourceToRevalidate;
m_resourceToRevalidate->registerHandle(handle);
--m_handleCount;
}
ASSERT(!m_handleCount);
m_handlesToRevalidate.clear();
Vector<CachedResourceClient*> clientsToMove;
for (auto& entry : m_clients) {
CachedResourceClient* client = entry.key;
unsigned count = entry.value;
while (count) {
clientsToMove.append(client);
--count;
}
}
for (auto& client : clientsToMove)
removeClient(*client);
ASSERT(m_clients.isEmpty());
for (auto& client : clientsToMove)
m_resourceToRevalidate->addClientToSet(*client);
for (auto& client : clientsToMove) {
// Calling didAddClient may do anything, including trying to cancel revalidation.
// Assert that it didn't succeed.
ASSERT(m_resourceToRevalidate);
// Calling didAddClient for a client may end up removing another client. In that case it won't be in the set anymore.
if (m_resourceToRevalidate->m_clients.contains(client))
m_resourceToRevalidate->didAddClient(*client);
}
m_switchingClientsToRevalidatedResource = false;
}
void CachedResource::updateResponseAfterRevalidation(const ResourceResponse& validatingResponse)
{
m_responseTimestamp = WallTime::now();
updateResponseHeadersAfterRevalidation(m_response, validatingResponse);
}
void CachedResource::registerHandle(CachedResourceHandleBase* h)
{
++m_handleCount;
if (m_resourceToRevalidate)
m_handlesToRevalidate.add(h);
}
void CachedResource::unregisterHandle(CachedResourceHandleBase* h)
{
ASSERT(m_handleCount > 0);
--m_handleCount;
if (m_resourceToRevalidate)
m_handlesToRevalidate.remove(h);
if (!m_handleCount)
deleteIfPossible();
}
bool CachedResource::canUseCacheValidator() const
{
if (m_loading || errorOccurred())
return false;
if (m_response.cacheControlContainsNoStore())
return false;
return m_response.hasCacheValidatorFields();
}
CachedResource::RevalidationDecision CachedResource::makeRevalidationDecision(CachePolicy cachePolicy) const
{
switch (cachePolicy) {
case CachePolicyHistoryBuffer:
return RevalidationDecision::No;
case CachePolicyReload:
return RevalidationDecision::YesDueToCachePolicy;
case CachePolicyRevalidate:
if (m_response.cacheControlContainsImmutable() && m_response.url().protocolIs("https")) {
if (isExpired())
return RevalidationDecision::YesDueToExpired;
return RevalidationDecision::No;
}
return RevalidationDecision::YesDueToCachePolicy;
case CachePolicyVerify:
if (m_response.cacheControlContainsNoCache())
return RevalidationDecision::YesDueToNoCache;
// FIXME: Cache-Control:no-store should prevent storing, not reuse.
if (m_response.cacheControlContainsNoStore())
return RevalidationDecision::YesDueToNoStore;
if (isExpired())
return RevalidationDecision::YesDueToExpired;
return RevalidationDecision::No;
};
ASSERT_NOT_REACHED();
return RevalidationDecision::No;
}
bool CachedResource::redirectChainAllowsReuse(ReuseExpiredRedirectionOrNot reuseExpiredRedirection) const
{
return WebCore::redirectChainAllowsReuse(m_redirectChainCacheStatus, reuseExpiredRedirection);
}
bool CachedResource::varyHeaderValuesMatch(const ResourceRequest& request)
{
if (m_varyingHeaderValues.isEmpty())
return true;
return verifyVaryingRequestHeaders(m_varyingHeaderValues, request, m_sessionID);
}
unsigned CachedResource::overheadSize() const
{
static const int kAverageClientsHashMapSize = 384;
return sizeof(CachedResource) + m_response.memoryUsage() + kAverageClientsHashMapSize + m_resourceRequest.url().string().length() * 2;
}
bool CachedResource::areAllClientsXMLHttpRequests() const
{
if (type() != RawResource)
return false;
for (auto& client : m_clients) {
if (!client.key->isXMLHttpRequest())
return false;
}
return true;
}
void CachedResource::setLoadPriority(const std::optional<ResourceLoadPriority>& loadPriority)
{
if (loadPriority)
m_loadPriority = loadPriority.value();
else
m_loadPriority = defaultPriorityForResourceType(type());
}
inline CachedResource::Callback::Callback(CachedResource& resource, CachedResourceClient& client)
: m_resource(resource)
, m_client(client)
, m_timer(*this, &Callback::timerFired)
{
m_timer.startOneShot(0_s);
}
inline void CachedResource::Callback::cancel()
{
if (m_timer.isActive())
m_timer.stop();
}
void CachedResource::Callback::timerFired()
{
m_resource.didAddClient(m_client);
}
#if USE(FOUNDATION) || USE(SOUP)
void CachedResource::tryReplaceEncodedData(SharedBuffer& newBuffer)
{
if (!m_data)
return;
if (!mayTryReplaceEncodedData())
return;
// We have to do the memcmp because we can't tell if the replacement file backed data is for the
// same resource or if we made a second request with the same URL which gave us a different
// resource. We have seen this happen for cached POST resources.
if (m_data->size() != newBuffer.size() || memcmp(m_data->data(), newBuffer.data(), m_data->size()))
return;
m_data->clear();
m_data->append(newBuffer);
didReplaceSharedBufferContents();
}
#endif
}