chrome_http_user_agent_settings.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
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 and uses
19// |content::GetUserAgent| to provide the HTTP User-Agent header value.
20class ChromeHttpUserAgentSettings : public net::HttpUserAgentSettings {
21 public:
22  // Must be called on the UI thread.
23  explicit ChromeHttpUserAgentSettings(PrefService* prefs);
24  // Must be called on the IO thread.
25  virtual ~ChromeHttpUserAgentSettings();
26
27  void CleanupOnUIThread();
28
29  // net::HttpUserAgentSettings implementation
30  virtual std::string GetAcceptLanguage() const OVERRIDE;
31  virtual std::string GetUserAgent(const GURL& url) const OVERRIDE;
32
33 private:
34  StringPrefMember pref_accept_language_;
35
36  // Avoid re-processing by caching the last value from the preferences and the
37  // last result of processing via net::HttpUtil::GenerateAccept*Header().
38  mutable std::string last_pref_accept_language_;
39  mutable std::string last_http_accept_language_;
40
41  DISALLOW_COPY_AND_ASSIGN(ChromeHttpUserAgentSettings);
42};
43
44#endif  // CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
45
46