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/*
* Copyright (C) 2011 Google 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 AND ITS CONTRIBUTORS ``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 "CachedRawResource.h"
#include "CachedRawResourceClient.h"
#include "CachedResourceClientWalker.h"
#include "CachedResourceLoader.h"
#include "HTTPHeaderNames.h"
#include "SharedBuffer.h"
#include "SubresourceLoader.h"
#include <wtf/CompletionHandler.h>
#include <wtf/SetForScope.h>
#include <wtf/text/StringView.h>
namespace WebCore {
CachedRawResource::CachedRawResource(CachedResourceRequest&& request, Type type, PAL::SessionID sessionID)
: CachedResource(WTFMove(request), type, sessionID)
, m_identifier(0)
, m_allowEncodedDataReplacement(true)
{
ASSERT(isMainOrMediaOrIconOrRawResource());
}
std::optional<SharedBufferDataView> CachedRawResource::calculateIncrementalDataChunk(const SharedBuffer* data) const
{
size_t previousDataLength = encodedSize();
if (!data || data->size() <= previousDataLength)
return std::nullopt;
return data->getSomeData(previousDataLength);
}
void CachedRawResource::updateBuffer(SharedBuffer& data)
{
// Skip any updateBuffers triggered from nested runloops. We'll have the complete buffer in finishLoading.
if (m_inIncrementalDataNotify)
return;
CachedResourceHandle<CachedRawResource> protectedThis(this);
ASSERT(dataBufferingPolicy() == BufferData);
m_data = &data;
auto previousDataSize = encodedSize();
while (data.size() > previousDataSize) {
auto incrementalData = data.getSomeData(previousDataSize);
previousDataSize += incrementalData.size();
SetForScope<bool> notifyScope(m_inIncrementalDataNotify, true);
notifyClientsDataWasReceived(incrementalData.data(), incrementalData.size());
};
setEncodedSize(data.size());
if (dataBufferingPolicy() == DoNotBufferData) {
if (m_loader)
m_loader->setDataBufferingPolicy(DoNotBufferData);
clear();
} else
CachedResource::updateBuffer(data);
if (m_delayedFinishLoading) {
auto delayedFinishLoading = std::exchange(m_delayedFinishLoading, std::nullopt);
finishLoading(delayedFinishLoading->buffer.get());
}
}
void CachedRawResource::updateData(const char* data, unsigned length)
{
ASSERT(dataBufferingPolicy() == DoNotBufferData);
notifyClientsDataWasReceived(data, length);
CachedResource::updateData(data, length);
}
void CachedRawResource::finishLoading(SharedBuffer* data)
{
if (m_inIncrementalDataNotify) {
// We may get here synchronously from updateBuffer() if the callback there ends up spinning a runloop.
// In that case delay the call.
m_delayedFinishLoading = std::make_optional(DelayedFinishLoading { data });
return;
};
CachedResourceHandle<CachedRawResource> protectedThis(this);
DataBufferingPolicy dataBufferingPolicy = this->dataBufferingPolicy();
if (dataBufferingPolicy == BufferData) {
m_data = data;
if (auto incrementalData = calculateIncrementalDataChunk(data)) {
setEncodedSize(data->size());
notifyClientsDataWasReceived(incrementalData->data(), incrementalData->size());
}
}
#if USE(QUICK_LOOK)
m_allowEncodedDataReplacement = m_loader && !m_loader->isQuickLookResource();
#endif
CachedResource::finishLoading(data);
if (dataBufferingPolicy == BufferData && this->dataBufferingPolicy() == DoNotBufferData) {
if (m_loader)
m_loader->setDataBufferingPolicy(DoNotBufferData);
clear();
}
}
void CachedRawResource::notifyClientsDataWasReceived(const char* data, unsigned length)
{
if (!length)
return;
CachedResourceHandle<CachedRawResource> protectedThis(this);
CachedResourceClientWalker<CachedRawResourceClient> w(m_clients);
while (CachedRawResourceClient* c = w.next())
c->dataReceived(*this, data, length);
}
static void iterateRedirects(CachedResourceHandle<CachedRawResource>&& handle, CachedRawResourceClient& client, Vector<std::pair<ResourceRequest, ResourceResponse>>&& redirectsInReverseOrder, CompletionHandler<void(ResourceRequest&&)>&& completionHandler)
{
if (!handle->hasClient(client) || redirectsInReverseOrder.isEmpty())
return completionHandler({ });
auto redirectPair = redirectsInReverseOrder.takeLast();
client.redirectReceived(*handle, WTFMove(redirectPair.first), WTFMove(redirectPair.second), [handle = WTFMove(handle), client, redirectsInReverseOrder = WTFMove(redirectsInReverseOrder), completionHandler = WTFMove(completionHandler)] (ResourceRequest&&) mutable {
// Ignore the new request because we can't do anything with it.
// We're just replying a redirect chain that has already happened.
iterateRedirects(WTFMove(handle), client, WTFMove(redirectsInReverseOrder), WTFMove(completionHandler));
});
}
void CachedRawResource::didAddClient(CachedResourceClient& c)
{
CachedRawResourceClient& client = static_cast<CachedRawResourceClient&>(c);
size_t redirectCount = m_redirectChain.size();
Vector<std::pair<ResourceRequest, ResourceResponse>> redirectsInReverseOrder;
redirectsInReverseOrder.reserveInitialCapacity(redirectCount);
for (size_t i = 0; i < redirectCount; ++i) {
const auto& pair = m_redirectChain[redirectCount - i - 1];
redirectsInReverseOrder.uncheckedAppend(std::make_pair(pair.m_request, pair.m_redirectResponse));
}
iterateRedirects(CachedResourceHandle<CachedRawResource>(this), client, WTFMove(redirectsInReverseOrder), [this, protectedThis = CachedResourceHandle<CachedRawResource>(this), client = &client] (ResourceRequest&&) mutable {
if (!hasClient(*client))
return;
auto responseProcessedHandler = [this, protectedThis = WTFMove(protectedThis), client] {
if (!hasClient(*client))
return;
if (m_data)
client->dataReceived(*this, m_data->data(), m_data->size());
if (!hasClient(*client))
return;
CachedResource::didAddClient(*client);
};
if (!m_response.isNull()) {
ResourceResponse response(m_response);
if (validationCompleting())
response.setSource(ResourceResponse::Source::MemoryCacheAfterValidation);
else {
ASSERT(!validationInProgress());
response.setSource(ResourceResponse::Source::MemoryCache);
}
client->responseReceived(*this, response, WTFMove(responseProcessedHandler));
} else
responseProcessedHandler();
});
}
void CachedRawResource::allClientsRemoved()
{
if (m_loader)
m_loader->cancelIfNotFinishing();
}
static void iterateClients(CachedResourceClientWalker<CachedRawResourceClient>&& walker, CachedResourceHandle<CachedRawResource>&& handle, ResourceRequest&& request, std::unique_ptr<ResourceResponse>&& response, CompletionHandler<void(ResourceRequest&&)>&& completionHandler)
{
auto client = walker.next();
if (!client)
return completionHandler(WTFMove(request));
const ResourceResponse& responseReference = *response;
client->redirectReceived(*handle, WTFMove(request), responseReference, [walker = WTFMove(walker), handle = WTFMove(handle), response = WTFMove(response), completionHandler = WTFMove(completionHandler)] (ResourceRequest&& request) mutable {
iterateClients(WTFMove(walker), WTFMove(handle), WTFMove(request), WTFMove(response), WTFMove(completionHandler));
});
}
void CachedRawResource::redirectReceived(ResourceRequest&& request, const ResourceResponse& response, CompletionHandler<void(ResourceRequest&&)>&& completionHandler)
{
if (response.isNull())
CachedResource::redirectReceived(WTFMove(request), response, WTFMove(completionHandler));
else {
m_redirectChain.append(RedirectPair(request, response));
iterateClients(CachedResourceClientWalker<CachedRawResourceClient>(m_clients), CachedResourceHandle<CachedRawResource>(this), WTFMove(request), std::make_unique<ResourceResponse>(response), [this, protectedThis = CachedResourceHandle<CachedRawResource>(this), completionHandler = WTFMove(completionHandler), response] (ResourceRequest&& request) mutable {
CachedResource::redirectReceived(WTFMove(request), response, WTFMove(completionHandler));
});
}
}
void CachedRawResource::responseReceived(const ResourceResponse& response)
{
CachedResourceHandle<CachedRawResource> protectedThis(this);
if (!m_identifier)
m_identifier = m_loader->identifier();
CachedResource::responseReceived(response);
CachedResourceClientWalker<CachedRawResourceClient> w(m_clients);
while (CachedRawResourceClient* c = w.next())
c->responseReceived(*this, m_response, nullptr);
}
bool CachedRawResource::shouldCacheResponse(const ResourceResponse& response)
{
CachedResourceClientWalker<CachedRawResourceClient> w(m_clients);
while (CachedRawResourceClient* c = w.next()) {
if (!c->shouldCacheResponse(*this, response))
return false;
}
return true;
}
void CachedRawResource::didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
{
CachedResourceClientWalker<CachedRawResourceClient> w(m_clients);
while (CachedRawResourceClient* c = w.next())
c->dataSent(*this, bytesSent, totalBytesToBeSent);
}
void CachedRawResource::finishedTimingForWorkerLoad(ResourceTiming&& resourceTiming)
{
CachedResourceClientWalker<CachedRawResourceClient> w(m_clients);
while (CachedRawResourceClient* c = w.next())
c->finishedTimingForWorkerLoad(*this, resourceTiming);
}
void CachedRawResource::switchClientsToRevalidatedResource()
{
ASSERT(m_loader);
// If we're in the middle of a successful revalidation, responseReceived() hasn't been called, so we haven't set m_identifier.
ASSERT(!m_identifier);
downcast<CachedRawResource>(*resourceToRevalidate()).m_identifier = m_loader->identifier();
CachedResource::switchClientsToRevalidatedResource();
}
void CachedRawResource::setDefersLoading(bool defers)
{
if (m_loader)
m_loader->setDefersLoading(defers);
}
void CachedRawResource::setDataBufferingPolicy(DataBufferingPolicy dataBufferingPolicy)
{
m_options.dataBufferingPolicy = dataBufferingPolicy;
}
static bool shouldIgnoreHeaderForCacheReuse(HTTPHeaderName name)
{
switch (name) {
// FIXME: This list of headers that don't affect cache policy almost certainly isn't complete.
case HTTPHeaderName::Accept:
case HTTPHeaderName::CacheControl:
case HTTPHeaderName::Pragma:
case HTTPHeaderName::Purpose:
case HTTPHeaderName::Referer:
case HTTPHeaderName::UserAgent:
return true;
default:
return false;
}
}
bool CachedRawResource::canReuse(const ResourceRequest& newRequest) const
{
if (dataBufferingPolicy() == DoNotBufferData)
return false;
if (m_resourceRequest.httpMethod() != newRequest.httpMethod())
return false;
if (m_resourceRequest.httpBody() != newRequest.httpBody())
return false;
if (m_resourceRequest.allowCookies() != newRequest.allowCookies())
return false;
if (newRequest.isConditional())
return false;
// Ensure most headers match the existing headers before continuing.
// Note that the list of ignored headers includes some headers explicitly related to caching.
// A more detailed check of caching policy will be performed later, this is simply a list of
// headers that we might permit to be different and still reuse the existing CachedResource.
const HTTPHeaderMap& newHeaders = newRequest.httpHeaderFields();
const HTTPHeaderMap& oldHeaders = m_resourceRequest.httpHeaderFields();
for (const auto& header : newHeaders) {
if (header.keyAsHTTPHeaderName) {
if (!shouldIgnoreHeaderForCacheReuse(header.keyAsHTTPHeaderName.value())
&& header.value != oldHeaders.commonHeaders().get(header.keyAsHTTPHeaderName.value()))
return false;
} else if (header.value != oldHeaders.uncommonHeaders().get(header.key))
return false;
}
// For this second loop, we don't actually need to compare values, checking that the
// key is contained in newHeaders is sufficient due to the previous loop.
for (const auto& header : oldHeaders) {
if (header.keyAsHTTPHeaderName) {
if (!shouldIgnoreHeaderForCacheReuse(header.keyAsHTTPHeaderName.value())
&& !newHeaders.commonHeaders().contains(header.keyAsHTTPHeaderName.value()))
return false;
} else if (!newHeaders.uncommonHeaders().contains(header.key))
return false;
}
return true;
}
void CachedRawResource::clear()
{
m_data = nullptr;
setEncodedSize(0);
if (m_loader)
m_loader->clearResourceData();
}
} // namespace WebCore