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// Copyright 2017 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 COMPONENTS_SAFE_BROWSING_BROWSER_BROWSER_URL_LOADER_THROTTLE_H_
#define COMPONENTS_SAFE_BROWSING_BROWSER_BROWSER_URL_LOADER_THROTTLE_H_
#include <memory>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "content/public/common/url_loader_throttle.h"
#include "url/gurl.h"
namespace content {
class WebContents;
}
namespace safe_browsing {
class SafeBrowsingUrlCheckerImpl;
class UrlCheckerDelegate;
// BrowserURLLoaderThrottle is used in the browser process to query
// SafeBrowsing to determine whether a URL and also its redirect URLs are safe
// to load.
//
// This throttle never defers starting the URL request or following redirects,
// no matter on mobile or desktop. If any of the checks for the original URL
// and redirect chain are not complete by the time the response headers are
// available, the request is deferred until all the checks are done. It cancels
// the load if any URLs turn out to be bad.
class BrowserURLLoaderThrottle : public content::URLLoaderThrottle {
public:
static std::unique_ptr<BrowserURLLoaderThrottle> MaybeCreate(
scoped_refptr<UrlCheckerDelegate> url_checker_delegate,
const base::Callback<content::WebContents*()>& web_contents_getter);
~BrowserURLLoaderThrottle() override;
// content::URLLoaderThrottle implementation.
void WillStartRequest(network::ResourceRequest* request,
bool* defer) override;
void WillRedirectRequest(const net::RedirectInfo& redirect_info,
const network::ResourceResponseHead& response_head,
bool* defer) override;
void WillProcessResponse(const GURL& response_url,
const network::ResourceResponseHead& response_head,
bool* defer) override;
private:
using NativeUrlCheckNotifier =
base::OnceCallback<void(bool /* proceed */,
bool /* showed_interstitial */)>;
// |web_contents_getter| is used for displaying SafeBrowsing UI when
// necessary.
BrowserURLLoaderThrottle(
scoped_refptr<UrlCheckerDelegate> url_checker_delegate,
const base::Callback<content::WebContents*()>& web_contents_getter);
// |slow_check| indicates whether it reports the result of a slow check.
// (Please see comments of OnCheckUrlResult() for what slow check means).
void OnCompleteCheck(bool slow_check, bool proceed, bool showed_interstitial);
// If |slow_check_notifier| is non-null, it indicates that a "slow check" is
// ongoing, i.e., the URL may be unsafe and a more time-consuming process is
// required to get the final result. In that case, the rest of the callback
// arguments should be ignored. This method sets the |slow_check_notifier|
// output parameter to a callback to receive the final result.
void OnCheckUrlResult(NativeUrlCheckNotifier* slow_check_notifier,
bool proceed,
bool showed_interstitial);
// The following member stays valid until |url_checker_| is created.
scoped_refptr<UrlCheckerDelegate> url_checker_delegate_;
base::Callback<content::WebContents*()> web_contents_getter_;
std::unique_ptr<SafeBrowsingUrlCheckerImpl> url_checker_;
size_t pending_checks_ = 0;
// How many slow checks that haven't received results.
size_t pending_slow_checks_ = 0;
bool blocked_ = false;
// The time when we started deferring the request.
base::TimeTicks defer_start_time_;
bool deferred_ = false;
// The total delay caused by SafeBrowsing deferring the resource load.
base::TimeDelta total_delay_;
// Whether the interstitial page has been shown and therefore user action has
// been involved.
bool user_action_involved_ = false;
GURL original_url_;
DISALLOW_COPY_AND_ASSIGN(BrowserURLLoaderThrottle);
};
} // namespace safe_browsing
#endif // COMPONENTS_SAFE_BROWSING_BROWSER_BROWSER_URL_LOADER_THROTTLE_H_
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