chrome/browser/net/chrome_http_user_agent_settings.h

   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
  15 class PrefService;
  16
  17 // An implementation of |HttpUserAgentSettings| that provides HTTP header
  18 // Accept-Language value that tracks Pref settings.
  19 class 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   ~ChromeHttpUserAgentSettings() override;
  25
  26   void CleanupOnUIThread();
  27
  28   // net::HttpUserAgentSettings implementation
  29   std::string GetAcceptLanguage() const override;
  30   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