external/webkit r30707

1 files changed, 413 insertions, 0 deletions

diff --git a/WebCore/loader/ResourceLoader.cpp b/WebCore/loader/ResourceLoader.cpp
new file mode 100644
index 0000000..ea96e34
--- /dev/null
+++ b/WebCore/loader/ResourceLoader.cpp
@@ -0,0 +1,413 @@
+/*
+ * 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 "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_reachedTerminalState(false)
+    , m_cancelled(false)
+    , m_calledDidFinishLoad(false)
+    , m_sendResourceLoadCallbacks(sendResourceLoadCallbacks)
+    , m_shouldContentSniff(shouldContentSniff)
+    , m_shouldBufferData(true)
+    , m_frame(frame)
+    , m_documentLoader(frame->loader()->activeDocumentLoader())
+    , m_identifier(0)
+    , 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(!frameLoader()->isArchiveLoadPending(this));
+    
+    m_originalURL = r.url();
+    
+    ResourceRequest clientRequest(r);
+    willSendRequest(clientRequest, ResourceResponse());
+    if (clientRequest.isNull()) {
+        didFail(frameLoader()->cancelledError(r));
+        return false;
+    }
+    
+    if (frameLoader()->willUseArchive(this, clientRequest, m_originalURL))
+        return true;
+    
+    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 = new SharedBuffer(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 = new SharedBuffer(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::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 (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 = new SharedBuffer(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 (m_sendResourceLoadCallbacks && !m_calledDidFinishLoad)
+        frameLoader()->didFailToLoad(this, error);
+
+    releaseResources();
+}
+
+void ResourceLoader::wasBlocked()
+{
+    didFail(blockedError());
+}
+
+void ResourceLoader::didCancel(const ResourceError& error)
+{
+    ASSERT(!m_cancelled);
+    ASSERT(!m_reachedTerminalState);
+
+    // 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();
+
+    frameLoader()->cancelPendingArchiveLoad(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);
+}
+
+void ResourceLoader::willSendRequest(ResourceHandle*, ResourceRequest& request, const ResourceResponse& redirectResponse)
+{
+    willSendRequest(request, redirectResponse);
+}
+
+void ResourceLoader::didReceiveResponse(ResourceHandle*, const ResourceResponse& response)
+{
+    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)
+{
+    didFail(error);
+}
+
+void ResourceLoader::wasBlocked(ResourceHandle*)
+{
+    wasBlocked();
+}
+
+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;    
+}
+
+}