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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
#define CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
#pragma once
#include <string>
#include "content/browser/renderer_host/resource_handler.h"
class MessageLoop;
class ResourceDispatcherHost;
namespace net {
class URLRequest;
} // namespace net
// Used to buffer a request until enough data has been received.
class BufferedResourceHandler : public ResourceHandler {
public:
BufferedResourceHandler(ResourceHandler* handler,
ResourceDispatcherHost* host,
net::URLRequest* request);
// ResourceHandler implementation:
virtual bool OnUploadProgress(int request_id, uint64 position, uint64 size);
virtual bool OnRequestRedirected(int request_id, const GURL& new_url,
ResourceResponse* response, bool* defer);
virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
virtual bool OnWillStart(int request_id, const GURL& url, bool* defer);
virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
int min_size);
virtual bool OnReadCompleted(int request_id, int* bytes_read);
virtual bool OnResponseCompleted(int request_id,
const net::URLRequestStatus& status,
const std::string& security_info);
virtual void OnRequestClosed();
private:
virtual ~BufferedResourceHandler();
// Returns true if we should delay OnResponseStarted forwarding.
bool DelayResponse();
// Returns true if there will be a need to parse the DocType of the document
// to determine the right way to handle it.
bool ShouldBuffer(const GURL& url, const std::string& mime_type);
// Returns true if there is enough information to process the DocType.
bool DidBufferEnough(int bytes_read);
// Returns true if we have to keep buffering data.
bool KeepBuffering(int bytes_read);
// Sends a pending OnResponseStarted notification. |in_complete| is true if
// this is invoked from |OnResponseCompleted|.
bool CompleteResponseStarted(int request_id, bool in_complete);
// Returns true if we have to wait until the plugin list is generated.
bool ShouldWaitForPlugins();
// A test to determining whether the request should be forwarded to the
// download thread. If need_plugin_list was passed in and was set to true,
// that means that the check couldn't be fully done because the plugins aren't
// loaded. The function should be called again after the plugin list is
// loaded.
bool ShouldDownload(bool* need_plugin_list);
// Informs the original ResourceHandler |real_handler_| that the response will
// be handled entirely by the new ResourceHandler |handler|.
// A reference to |handler| is acquired.
void UseAlternateResourceHandler(int request_id, ResourceHandler* handler);
// Called on the file thread to load the list of plugins.
void LoadPlugins();
// Called on the IO thread once the list of plugins has been loaded.
void OnPluginsLoaded();
scoped_refptr<ResourceHandler> real_handler_;
scoped_refptr<ResourceResponse> response_;
ResourceDispatcherHost* host_;
net::URLRequest* request_;
scoped_refptr<net::IOBuffer> read_buffer_;
scoped_refptr<net::IOBuffer> my_buffer_;
int read_buffer_size_;
int bytes_read_;
bool sniff_content_;
bool should_buffer_;
bool wait_for_plugins_;
bool buffering_;
bool finished_;
DISALLOW_COPY_AND_ASSIGN(BufferedResourceHandler);
};
#endif // CONTENT_BROWSER_RENDERER_HOST_BUFFERED_RESOURCE_HANDLER_H_
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