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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 "core/fetch/RawResource.h"
#include "core/fetch/ResourceClientWalker.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/fetch/ResourceLoader.h"
#include "platform/SharedBuffer.h"
namespace blink {
RawResource::RawResource(const ResourceRequest& resourceRequest, Type type)
: Resource(resourceRequest, type)
{
}
void RawResource::appendData(const char* data, unsigned length)
{
Resource::appendData(data, length);
ResourcePtr<RawResource> protect(this);
ResourceClientWalker<RawResourceClient> w(m_clients);
while (RawResourceClient* c = w.next())
c->dataReceived(this, data, length);
}
void RawResource::didAddClient(ResourceClient* c)
{
if (!hasClient(c))
return;
// The calls to the client can result in events running, potentially causing
// this resource to be evicted from the cache and all clients to be removed,
// so a protector is necessary.
ResourcePtr<RawResource> protect(this);
RawResourceClient* client = static_cast<RawResourceClient*>(c);
for (const auto& redirect : redirectChain()) {
ResourceRequest request(redirect.m_request);
client->redirectReceived(this, request, redirect.m_redirectResponse);
if (!hasClient(c))
return;
}
if (!m_response.isNull())
client->responseReceived(this, m_response, nullptr);
if (!hasClient(c))
return;
if (m_data)
client->dataReceived(this, m_data->data(), m_data->size());
if (!hasClient(c))
return;
Resource::didAddClient(client);
}
void RawResource::willFollowRedirect(ResourceRequest& newRequest, const ResourceResponse& redirectResponse)
{
ResourcePtr<RawResource> protect(this);
if (!redirectResponse.isNull()) {
ResourceClientWalker<RawResourceClient> w(m_clients);
while (RawResourceClient* c = w.next())
c->redirectReceived(this, newRequest, redirectResponse);
}
Resource::willFollowRedirect(newRequest, redirectResponse);
}
void RawResource::updateRequest(const ResourceRequest& request)
{
ResourcePtr<RawResource> protect(this);
ResourceClientWalker<RawResourceClient> w(m_clients);
while (RawResourceClient* c = w.next())
c->updateRequest(this, request);
}
void RawResource::responseReceived(const ResourceResponse& response, PassOwnPtr<WebDataConsumerHandle> handle)
{
InternalResourcePtr protect(this);
Resource::responseReceived(response, nullptr);
ResourceClientWalker<RawResourceClient> w(m_clients);
ASSERT(count() <= 1 || !handle);
while (RawResourceClient* c = w.next()) {
// |handle| is cleared when passed, but it's not a problem because
// |handle| is null when there are two or more clients, as asserted.
c->responseReceived(this, m_response, handle);
}
}
void RawResource::didSendData(unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
{
ResourceClientWalker<RawResourceClient> w(m_clients);
while (RawResourceClient* c = w.next())
c->dataSent(this, bytesSent, totalBytesToBeSent);
}
void RawResource::didDownloadData(int dataLength)
{
ResourceClientWalker<RawResourceClient> w(m_clients);
while (RawResourceClient* c = w.next())
c->dataDownloaded(this, dataLength);
}
void RawResource::setDefersLoading(bool defers)
{
if (m_loader)
m_loader->setDefersLoading(defers);
}
static bool shouldIgnoreHeaderForCacheReuse(AtomicString headerName)
{
// FIXME: This list of headers that don't affect cache policy almost certainly isn't complete.
DEFINE_STATIC_LOCAL(HashSet<AtomicString>, m_headers, ());
if (m_headers.isEmpty()) {
m_headers.add("Cache-Control");
m_headers.add("If-Modified-Since");
m_headers.add("If-None-Match");
m_headers.add("Origin");
m_headers.add("Pragma");
m_headers.add("Purpose");
m_headers.add("Referer");
m_headers.add("User-Agent");
}
return m_headers.contains(headerName);
}
static bool isCacheableHTTPMethod(const AtomicString& method)
{
// Per http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.10,
// these methods always invalidate the cache entry.
return method != "POST" && method != "PUT" && method != "DELETE";
}
bool RawResource::canReuse(const ResourceRequest& newRequest) const
{
if (m_options.dataBufferingPolicy == DoNotBufferData)
return false;
if (!isCacheableHTTPMethod(m_resourceRequest.httpMethod()))
return false;
if (m_resourceRequest.httpMethod() != newRequest.httpMethod())
return false;
if (m_resourceRequest.httpBody() != newRequest.httpBody())
return false;
if (m_resourceRequest.allowStoredCredentials() != newRequest.allowStoredCredentials())
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 Resource.
const HTTPHeaderMap& newHeaders = newRequest.httpHeaderFields();
const HTTPHeaderMap& oldHeaders = m_resourceRequest.httpHeaderFields();
for (const auto& header : newHeaders) {
AtomicString headerName = header.key;
if (!shouldIgnoreHeaderForCacheReuse(headerName) && header.value != oldHeaders.get(headerName))
return false;
}
for (const auto& header : oldHeaders) {
AtomicString headerName = header.key;
if (!shouldIgnoreHeaderForCacheReuse(headerName) && header.value != newHeaders.get(headerName))
return false;
}
return true;
}
} // namespace blink
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