chrome/browser/ui/webui/local_state/local_state_ui.cc

   1 // Copyright 2014 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 #include "chrome/browser/ui/webui/local_state/local_state_ui.h"
   6
   7 #include <string>
   8
   9 #include "base/json/json_string_value_serializer.h"
  10 #include "base/prefs/pref_service.h"
  11 #include "chrome/browser/browser_process.h"
  12 #include "chrome/browser/profiles/profile.h"
  13 #include "chrome/common/url_constants.h"
  14 #include "content/public/browser/web_ui.h"
  15 #include "content/public/browser/web_ui_controller.h"
  16 #include "content/public/browser/web_ui_data_source.h"
  17 #include "content/public/browser/web_ui_message_handler.h"
  18 #include "grit/browser_resources.h"
  19
  20 namespace {
  21
  22 // UI Handler for chrome://local-state. Displays the Local State file as JSON.
  23 class LocalStateUIHandler : public content::WebUIMessageHandler {
  24  public:
  25   LocalStateUIHandler();
  26   ~LocalStateUIHandler() override;
  27
  28   // content::WebUIMessageHandler:
  29   void RegisterMessages() override;
  30
  31  private:
  32   // Called from JS when the page has loaded. Serializes local state prefs and
  33   // sends them to the page.
  34   void HandleRequestJson(const base::ListValue* args);
  35
  36   DISALLOW_COPY_AND_ASSIGN(LocalStateUIHandler);
  37 };
  38
  39 LocalStateUIHandler::LocalStateUIHandler() {
  40 }
  41
  42 LocalStateUIHandler::~LocalStateUIHandler() {
  43 }
  44
  45 void LocalStateUIHandler::RegisterMessages() {
  46   web_ui()->RegisterMessageCallback(
  47       "requestJson", base::Bind(&LocalStateUIHandler::HandleRequestJson,
  48                                 base::Unretained(this)));
  49 }
  50
  51 void LocalStateUIHandler::HandleRequestJson(const base::ListValue* args) {
  52 #if !defined(OS_CHROMEOS)
  53   scoped_ptr<base::DictionaryValue> local_state_values(
  54       g_browser_process->local_state()->GetPreferenceValuesOmitDefaults());
  55
  56   std::string json;
  57   JSONStringValueSerializer serializer(&json);
  58   serializer.set_pretty_print(true);
  59   bool result = serializer.Serialize(*local_state_values);
  60   if (!result)
  61     json = "Error loading Local State file.";
  62
  63   web_ui()->CallJavascriptFunction("localState.setLocalState",
  64                                    base::StringValue(json));
  65 #endif  // !defined(OS_CHROMEOS)
  66 }
  67
  68 }  // namespace
  69
  70 LocalStateUI::LocalStateUI(content::WebUI* web_ui) : WebUIController(web_ui) {
  71   // Set up the chrome://local-state source.
  72   content::WebUIDataSource* html_source =
  73       content::WebUIDataSource::Create(chrome::kChromeUILocalStateHost);
  74   html_source->SetDefaultResource(IDR_LOCAL_STATE_HTML);
  75   html_source->AddResourcePath("local_state.js", IDR_LOCAL_STATE_JS);
  76   content::WebUIDataSource::Add(Profile::FromWebUI(web_ui), html_source);
  77
  78   // AddMessageHandler takes ownership of LocalStateUIHandler.
  79   web_ui->AddMessageHandler(new LocalStateUIHandler);
  80 }
  81
  82 LocalStateUI::~LocalStateUI() {
  83 }