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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 CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_HANDLER_H_
#define CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_HANDLER_H_
#pragma once
#include <string>
#include "base/callback.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/browser/renderer_host/resource_handler.h"
class ChromeURLRequestContext;
namespace net {
class URLRequest;
}
// The PrerenderResourceHandler initiates prerendering of web pages
// under the following conditions:
// - The profile which initiated the request allows prerendering.
// - The initial request is a GET for a PREFETCH resource type.
// - The final URL (after redirects) has a scheme of http or https.
// - The response status code is a 200.
// - The MIME type of the response (sniffed or explicit) is text/html.
// - The resource will not need to revalidate within 30 seconds. This prevents
// no-cache or very quickly refreshing resources from being prerendered.
class PrerenderResourceHandler : public ResourceHandler {
public:
typedef base::Time (*GetCurrentTimeFunction)();
// Creates a new PrerenderResourceHandler if appropriate for the
// given |request| and |context|, otherwise NULL is returned. The
// caller is resposible for deleting the returned handler.
//
// |next_handler| is the backup handler that this handler delegates to
// for the majority of the commands, and must be non-NULL.
static PrerenderResourceHandler* MaybeCreate(
const net::URLRequest& request,
ChromeURLRequestContext* context,
ResourceHandler* next_handler);
// OnResponseStarted will ask the |prerender_manager_| to start
// prerendering the requested resource if it is of an appropriate
// content type. The next handler is still invoked.
virtual bool OnResponseStarted(int request_id,
ResourceResponse* response);
// The following methods simply delegate to the next_handler.
virtual bool OnUploadProgress(int request_id,
uint64 position,
uint64 size);
virtual bool OnRequestRedirected(int request_id, const GURL& url,
ResourceResponse* response,
bool* defer);
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:
friend class PrerenderResourceHandlerTest;
typedef Callback2<const GURL&, const std::vector<GURL>&>::Type
PrerenderCallback;
static const int kDefaultPrerenderDurationSeconds;
PrerenderResourceHandler(ResourceHandler* next_handler,
PrerenderManager* prerender_manager);
PrerenderResourceHandler(ResourceHandler* next_handler,
PrerenderCallback* callback);
virtual ~PrerenderResourceHandler();
void RunCallbackFromUIThread(const GURL& url,
const std::vector<GURL>& alias_urls);
void StartPrerender(const GURL& url,
const std::vector<GURL>& alias_urls);
void set_prerender_duration(base::TimeDelta prerender_duration);
void set_get_current_time_function(GetCurrentTimeFunction get_current_time);
// The set of URLs that are aliases to the URL to be prerendered,
// as a result of redirects.
std::vector<GURL> alias_urls_;
GURL url_;
scoped_refptr<ResourceHandler> next_handler_;
scoped_refptr<PrerenderManager> prerender_manager_;
scoped_ptr<PrerenderCallback> prerender_callback_;
base::TimeDelta prerender_duration_;
GetCurrentTimeFunction get_current_time_;
DISALLOW_COPY_AND_ASSIGN(PrerenderResourceHandler);
};
#endif // CHROME_BROWSER_PRERENDER_PRERENDER_RESOURCE_HANDLER_H_
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