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/*
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
* (C) 2007 Graham Dennis (graham.dennis@gmail.com)
*
* 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.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 OR ITS 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 "ResourceLoader.h"
#include "ApplicationCacheHost.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "Page.h"
#include "ProgressTracker.h"
#include "ResourceHandle.h"
#include "ResourceError.h"
#include "Settings.h"
#include "SharedBuffer.h"
namespace WebCore {
PassRefPtr<SharedBuffer> ResourceLoader::resourceData()
{
if (m_resourceData)
return m_resourceData;
if (ResourceHandle::supportsBufferedData() && m_handle)
return m_handle->bufferedData();
return 0;
}
ResourceLoader::ResourceLoader(Frame* frame, bool sendResourceLoadCallbacks, bool shouldContentSniff)
: m_frame(frame)
, m_documentLoader(frame->loader()->activeDocumentLoader())
, m_identifier(0)
, m_reachedTerminalState(false)
, m_cancelled(false)
, m_calledDidFinishLoad(false)
, m_sendResourceLoadCallbacks(sendResourceLoadCallbacks)
, m_shouldContentSniff(shouldContentSniff)
, m_shouldBufferData(true)
, m_defersLoading(frame->page()->defersLoading())
{
}
ResourceLoader::~ResourceLoader()
{
ASSERT(m_reachedTerminalState);
}
void ResourceLoader::releaseResources()
{
ASSERT(!m_reachedTerminalState);
// It's possible that when we release the handle, it will be
// deallocated and release the last reference to this object.
// We need to retain to avoid accessing the object after it
// has been deallocated and also to avoid reentering this method.
RefPtr<ResourceLoader> protector(this);
m_frame = 0;
m_documentLoader = 0;
// We need to set reachedTerminalState to true before we release
// the resources to prevent a double dealloc of WebView <rdar://problem/4372628>
m_reachedTerminalState = true;
m_identifier = 0;
if (m_handle) {
// Clear out the ResourceHandle's client so that it doesn't try to call
// us back after we release it.
m_handle->setClient(0);
m_handle = 0;
}
m_resourceData = 0;
m_deferredRequest = ResourceRequest();
}
bool ResourceLoader::load(const ResourceRequest& r)
{
ASSERT(!m_handle);
ASSERT(m_deferredRequest.isNull());
ASSERT(!m_documentLoader->isSubstituteLoadPending(this));
ResourceRequest clientRequest(r);
willSendRequest(clientRequest, ResourceResponse());
if (clientRequest.isNull()) {
didFail(frameLoader()->cancelledError(r));
return false;
}
#if ENABLE(ARCHIVE) // ANDROID extension: disabled to reduce code size
if (m_documentLoader->scheduleArchiveLoad(this, clientRequest, r.url()))
return true;
#endif
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
if (m_documentLoader->applicationCacheHost()->maybeLoadResource(this, clientRequest, r.url()))
return true;
#endif
if (m_defersLoading) {
m_deferredRequest = clientRequest;
return true;
}
m_handle = ResourceHandle::create(clientRequest, this, m_frame.get(), m_defersLoading, m_shouldContentSniff, true);
return true;
}
void ResourceLoader::setDefersLoading(bool defers)
{
m_defersLoading = defers;
if (m_handle)
m_handle->setDefersLoading(defers);
if (!defers && !m_deferredRequest.isNull()) {
ResourceRequest request(m_deferredRequest);
m_deferredRequest = ResourceRequest();
load(request);
}
}
FrameLoader* ResourceLoader::frameLoader() const
{
if (!m_frame)
return 0;
return m_frame->loader();
}
void ResourceLoader::setShouldBufferData(bool shouldBufferData)
{
m_shouldBufferData = shouldBufferData;
// Reset any already buffered data
if (!m_shouldBufferData)
m_resourceData = 0;
}
void ResourceLoader::addData(const char* data, int length, bool allAtOnce)
{
if (!m_shouldBufferData)
return;
if (allAtOnce) {
m_resourceData = SharedBuffer::create(data, length);
return;
}
if (ResourceHandle::supportsBufferedData()) {
// Buffer data only if the connection has handed us the data because is has stopped buffering it.
if (m_resourceData)
m_resourceData->append(data, length);
} else {
if (!m_resourceData)
m_resourceData = SharedBuffer::create(data, length);
else
m_resourceData->append(data, length);
}
}
void ResourceLoader::clearResourceData()
{
if (m_resourceData)
m_resourceData->clear();
}
void ResourceLoader::willSendRequest(ResourceRequest& request, const ResourceResponse& redirectResponse)
{
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
ASSERT(!m_reachedTerminalState);
if (m_sendResourceLoadCallbacks) {
if (!m_identifier) {
m_identifier = m_frame->page()->progress()->createUniqueIdentifier();
frameLoader()->assignIdentifierToInitialRequest(m_identifier, request);
}
frameLoader()->willSendRequest(this, request, redirectResponse);
}
m_request = request;
}
void ResourceLoader::didSendData(unsigned long long, unsigned long long)
{
}
void ResourceLoader::didReceiveResponse(const ResourceResponse& r)
{
ASSERT(!m_reachedTerminalState);
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
m_response = r;
if (FormData* data = m_request.httpBody())
data->removeGeneratedFilesIfNeeded();
if (m_sendResourceLoadCallbacks)
frameLoader()->didReceiveResponse(this, m_response);
}
void ResourceLoader::didReceiveData(const char* data, int length, long long lengthReceived, bool allAtOnce)
{
// The following assertions are not quite valid here, since a subclass
// might override didReceiveData in a way that invalidates them. This
// happens with the steps listed in 3266216
// ASSERT(con == connection);
// ASSERT(!m_reachedTerminalState);
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
addData(data, length, allAtOnce);
// FIXME: If we get a resource with more than 2B bytes, this code won't do the right thing.
// However, with today's computers and networking speeds, this won't happen in practice.
// Could be an issue with a giant local file.
if (m_sendResourceLoadCallbacks && m_frame)
frameLoader()->didReceiveData(this, data, length, static_cast<int>(lengthReceived));
}
void ResourceLoader::willStopBufferingData(const char* data, int length)
{
if (!m_shouldBufferData)
return;
ASSERT(!m_resourceData);
m_resourceData = SharedBuffer::create(data, length);
}
void ResourceLoader::didFinishLoading()
{
// If load has been cancelled after finishing (which could happen with a
// JavaScript that changes the window location), do nothing.
if (m_cancelled)
return;
ASSERT(!m_reachedTerminalState);
didFinishLoadingOnePart();
releaseResources();
}
void ResourceLoader::didFinishLoadingOnePart()
{
if (m_cancelled)
return;
ASSERT(!m_reachedTerminalState);
if (m_calledDidFinishLoad)
return;
m_calledDidFinishLoad = true;
if (m_sendResourceLoadCallbacks)
frameLoader()->didFinishLoad(this);
}
void ResourceLoader::didFail(const ResourceError& error)
{
if (m_cancelled)
return;
ASSERT(!m_reachedTerminalState);
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
if (FormData* data = m_request.httpBody())
data->removeGeneratedFilesIfNeeded();
if (m_sendResourceLoadCallbacks && !m_calledDidFinishLoad)
frameLoader()->didFailToLoad(this, error);
releaseResources();
}
void ResourceLoader::didCancel(const ResourceError& error)
{
ASSERT(!m_cancelled);
ASSERT(!m_reachedTerminalState);
if (FormData* data = m_request.httpBody())
data->removeGeneratedFilesIfNeeded();
// This flag prevents bad behavior when loads that finish cause the
// load itself to be cancelled (which could happen with a javascript that
// changes the window location). This is used to prevent both the body
// of this method and the body of connectionDidFinishLoading: running
// for a single delegate. Cancelling wins.
m_cancelled = true;
if (m_handle)
m_handle->clearAuthentication();
m_documentLoader->cancelPendingSubstituteLoad(this);
if (m_handle) {
m_handle->cancel();
m_handle = 0;
}
if (m_sendResourceLoadCallbacks && !m_calledDidFinishLoad)
frameLoader()->didFailToLoad(this, error);
releaseResources();
}
void ResourceLoader::cancel()
{
cancel(ResourceError());
}
void ResourceLoader::cancel(const ResourceError& error)
{
if (m_reachedTerminalState)
return;
if (!error.isNull())
didCancel(error);
else
didCancel(cancelledError());
}
const ResourceResponse& ResourceLoader::response() const
{
return m_response;
}
ResourceError ResourceLoader::cancelledError()
{
return frameLoader()->cancelledError(m_request);
}
ResourceError ResourceLoader::blockedError()
{
return frameLoader()->blockedError(m_request);
}
ResourceError ResourceLoader::cannotShowURLError()
{
return frameLoader()->cannotShowURLError(m_request);
}
void ResourceLoader::willSendRequest(ResourceHandle*, ResourceRequest& request, const ResourceResponse& redirectResponse)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForRedirect(this, request, redirectResponse))
return;
#endif
willSendRequest(request, redirectResponse);
}
void ResourceLoader::didSendData(ResourceHandle*, unsigned long long bytesSent, unsigned long long totalBytesToBeSent)
{
didSendData(bytesSent, totalBytesToBeSent);
}
void ResourceLoader::didReceiveResponse(ResourceHandle*, const ResourceResponse& response)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForResponse(this, response))
return;
#endif
didReceiveResponse(response);
}
void ResourceLoader::didReceiveData(ResourceHandle*, const char* data, int length, int lengthReceived)
{
didReceiveData(data, length, lengthReceived, false);
}
void ResourceLoader::didFinishLoading(ResourceHandle*)
{
didFinishLoading();
}
void ResourceLoader::didFail(ResourceHandle*, const ResourceError& error)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForError(this, error))
return;
#endif
didFail(error);
}
void ResourceLoader::wasBlocked(ResourceHandle*)
{
didFail(blockedError());
}
void ResourceLoader::cannotShowURL(ResourceHandle*)
{
didFail(cannotShowURLError());
}
bool ResourceLoader::shouldUseCredentialStorage()
{
RefPtr<ResourceLoader> protector(this);
return frameLoader()->shouldUseCredentialStorage(this);
}
void ResourceLoader::didReceiveAuthenticationChallenge(const AuthenticationChallenge& challenge)
{
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
frameLoader()->didReceiveAuthenticationChallenge(this, challenge);
}
void ResourceLoader::didCancelAuthenticationChallenge(const AuthenticationChallenge& challenge)
{
// Protect this in this delegate method since the additional processing can do
// anything including possibly derefing this; one example of this is Radar 3266216.
RefPtr<ResourceLoader> protector(this);
frameLoader()->didCancelAuthenticationChallenge(this, challenge);
}
void ResourceLoader::receivedCancellation(const AuthenticationChallenge&)
{
cancel();
}
void ResourceLoader::willCacheResponse(ResourceHandle*, CacheStoragePolicy& policy)
{
// When in private browsing mode, prevent caching to disk
if (policy == StorageAllowed && m_frame->settings()->privateBrowsingEnabled())
policy = StorageAllowedInMemoryOnly;
}
}
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