1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
6#define CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
7
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/compiler_specific.h"
12#include "base/prefs/pref_member.h"
13#include "net/url_request/http_user_agent_settings.h"
14
15class PrefService;
16
17// An implementation of |HttpUserAgentSettings| that provides HTTP header
18// Accept-Language value that tracks Pref settings.
19class ChromeHttpUserAgentSettings : public net::HttpUserAgentSettings {
20 public:
21  // Must be called on the UI thread.
22  explicit ChromeHttpUserAgentSettings(PrefService* prefs);
23  // Must be called on the IO thread.
24  virtual ~ChromeHttpUserAgentSettings();
25
26  void CleanupOnUIThread();
27
28  // net::HttpUserAgentSettings implementation
29  virtual std::string GetAcceptLanguage() const OVERRIDE;
30  virtual std::string GetUserAgent() const OVERRIDE;
31
32 private:
33  StringPrefMember pref_accept_language_;
34
35  // Avoid re-processing by caching the last value from the preferences and the
36  // last result of processing via net::HttpUtil::GenerateAccept*Header().
37  mutable std::string last_pref_accept_language_;
38  mutable std::string last_http_accept_language_;
39
40  DISALLOW_COPY_AND_ASSIGN(ChromeHttpUserAgentSettings);
41};
42
43#endif  // CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
44
45