Provide mutable members of UrlRequestContext via pure-virtual interface. Create a pure-virtual interface called HttpUserAgentSettings that provides access to the Accept-Language, Accept-Charset, and User-Agent HTTP headers. Each UrlRequestContext should have a HttpUserAgentSettings implementation attached via set_http_user_agent_settings().

BUG=146596

Review URL: https://chromiumcodereview.appspot.com/10918279

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166425 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 49 insertions, 0 deletions

diff --git a/chrome/browser/net/chrome_http_user_agent_settings.h b/chrome/browser/net/chrome_http_user_agent_settings.h
new file mode 100644
index 0000000..a7d390f
--- /dev/null
+++ b/chrome/browser/net/chrome_http_user_agent_settings.h
@@ -0,0 +1,49 @@
+// Copyright (c) 2012 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_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
+#define CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "chrome/browser/api/prefs/pref_member.h"
+#include "net/url_request/http_user_agent_settings.h"
+
+class PrefService;
+
+// An implementation of |HttpUserAgentSettings| that provides HTTP headers
+// Accept-Language and Accept-Charset values that track Pref settings and uses
+// |content::GetUserAgent| to provide the HTTP User-Agent header value.
+class ChromeHttpUserAgentSettings : public net::HttpUserAgentSettings {
+ public:
+  // Must be called on the UI thread.
+  explicit ChromeHttpUserAgentSettings(PrefService* prefs);
+  // Must be called on the IO thread.
+  virtual ~ChromeHttpUserAgentSettings();
+
+  void CleanupOnUIThread();
+
+  // net::HttpUserAgentSettings implementation
+  virtual std::string GetAcceptLanguage() const OVERRIDE;
+  virtual std::string GetAcceptCharset() const OVERRIDE;
+  virtual std::string GetUserAgent(const GURL& url) const OVERRIDE;
+
+ private:
+  StringPrefMember pref_accept_language_;
+  StringPrefMember pref_accept_charset_;
+
+  // Avoid re-processing by caching the last value from the preferences and the
+  // last result of processing via net::HttpUtil::GenerateAccept*Header().
+  mutable std::string last_pref_accept_language_;
+  mutable std::string last_http_accept_language_;
+  mutable std::string last_pref_accept_charset_;
+  mutable std::string last_http_accept_charset_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeHttpUserAgentSettings);
+};
+
+#endif  // CHROME_BROWSER_NET_CHROME_HTTP_USER_AGENT_SETTINGS_H_
+