chrome/browser/translate/translate_manager.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_TRANSLATE_TRANSLATE_MANAGER_H_
   6 #define CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
   7
   8 #include <map>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/gtest_prod_util.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/observer_list.h"
  16 #include "base/time/time.h"
  17 #include "chrome/browser/ui/translate/translate_bubble_model.h"
  18 #include "components/translate/core/common/translate_errors.h"
  19 #include "content/public/browser/notification_observer.h"
  20 #include "content/public/browser/notification_registrar.h"
  21
  22 template <typename T> struct DefaultSingletonTraits;
  23 class GURL;
  24 struct LanguageDetectionDetails;
  25 struct PageTranslatedDetails;
  26 class PrefService;
  27 class Profile;
  28 struct ShortcutConfiguration;
  29 class TranslateAcceptLanguages;
  30 struct TranslateErrorDetails;
  31 struct TranslateEventDetails;
  32 class TranslateInfoBarDelegate;
  33 class TranslateLanguageList;
  34 class TranslateScript;
  35
  36 namespace content {
  37 class WebContents;
  38 }
  39
  40 namespace net {
  41 class URLFetcher;
  42 }
  43
  44 // The TranslateManager class is responsible for showing an info-bar when a page
  45 // in a language different than the user language is loaded.  It triggers the
  46 // page translation the user requests.
  47 // It is a singleton.
  48
  49 class TranslateManager : public content::NotificationObserver {
  50  public:
  51   // Returns the singleton instance.
  52   static TranslateManager* GetInstance();
  53
  54   virtual ~TranslateManager();
  55
  56   // Returns true if the URL can be translated.
  57   static bool IsTranslatableURL(const GURL& url);
  58
  59   // Fills |languages| with the list of languages that the translate server can
  60   // translate to and from.
  61   static void GetSupportedLanguages(std::vector<std::string>* languages);
  62
  63   // Returns the last-updated time when Chrome receives a language list from a
  64   // Translate server. Returns null time if Chrome hasn't received any lists.
  65   static base::Time GetSupportedLanguagesLastUpdated();
  66
  67   // Returns the language code that can be used with the Translate method for a
  68   // specified |chrome_locale|.
  69   static std::string GetLanguageCode(const std::string& chrome_locale);
  70
  71   // Returns true if |language| is supported by the translation server.
  72   static bool IsSupportedLanguage(const std::string& language);
  73
  74   // Returns true if |language| is supported by the translation server as a
  75   // alpha language.
  76   static bool IsAlphaLanguage(const std::string& language);
  77
  78   // Returns true if |language| is an Accept language for the user profile.
  79   static bool IsAcceptLanguage(Profile* profile, const std::string& language);
  80
  81   // Returns the language to translate to. The language returned is the
  82   // first language found in the following list that is supported by the
  83   // translation service:
  84   //     the UI language
  85   //     the accept-language list
  86   // If no language is found then an empty string is returned.
  87   static std::string GetTargetLanguage(PrefService* prefs);
  88
  89   // Returns the language to automatically translate to. |original_language| is
  90   // the webpage's original language.
  91   static std::string GetAutoTargetLanguage(const std::string& original_language,
  92                                            PrefService* prefs);
  93
  94   // Returns true if the new translate bubble is enabled.
  95   static bool IsTranslateBubbleEnabled();
  96
  97   // Let the caller decide if and when we should fetch the language list from
  98   // the translate server. This is a NOOP if switches::kDisableTranslate is set
  99   // or if prefs::kEnableTranslate is set to false.
 100   void FetchLanguageListFromTranslateServer(PrefService* prefs);
 101
 102   // Allows caller to cleanup pending URLFetcher objects to make sure they
 103   // get released in the appropriate thread... Mainly for tests.
 104   void CleanupPendingUlrFetcher();
 105
 106   // Translates the page contents from |source_lang| to |target_lang|.
 107   // The actual translation might be performed asynchronously if the translate
 108   // script is not yet available.
 109   void TranslatePage(content::WebContents* web_contents,
 110                      const std::string& source_lang,
 111                      const std::string& target_lang);
 112
 113   // Reverts the contents of the page in |web_contents| to its original
 114   // language.
 115   void RevertTranslation(content::WebContents* web_contents);
 116
 117   // Reports to the Google translate server that a page language was incorrectly
 118   // detected.  This call is initiated by the user selecting the "report" menu
 119   // under options in the translate infobar.
 120   void ReportLanguageDetectionError(content::WebContents* web_contents);
 121
 122   // Clears the translate script, so it will be fetched next time we translate.
 123   void ClearTranslateScript();
 124
 125   // content::NotificationObserver implementation:
 126   virtual void Observe(int type,
 127                        const content::NotificationSource& source,
 128                        const content::NotificationDetails& details) OVERRIDE;
 129
 130   // Used by unit-tests to override some defaults:
 131   // Delay after which the translate script is fetched again from the
 132   // translation server.
 133   void SetTranslateScriptExpirationDelay(int delay_ms);
 134
 135   // Number of attempts before waiting for a page to be fully reloaded.
 136   void set_translate_max_reload_attemps(int attempts) {
 137     max_reload_check_attempts_ = attempts;
 138   }
 139
 140   // The observer class for TranslateManager.
 141   class Observer {
 142    public:
 143     virtual void OnLanguageDetection(
 144         const LanguageDetectionDetails& details) = 0;
 145     virtual void OnTranslateError(
 146         const TranslateErrorDetails& details) = 0;
 147     virtual void OnTranslateEvent(
 148         const TranslateEventDetails& details) = 0;
 149   };
 150
 151   // Adds/removes observer.
 152   void AddObserver(Observer* obs);
 153   void RemoveObserver(Observer* obs);
 154
 155   // Notifies to the observers when translate event happens.
 156   void NotifyTranslateEvent(const TranslateEventDetails& details);
 157
 158  protected:
 159   TranslateManager();
 160
 161  private:
 162   friend struct DefaultSingletonTraits<TranslateManager>;
 163
 164   // Structure that describes a translate request.
 165   // Translation may be deferred while the translate script is being retrieved
 166   // from the translate server.
 167   struct PendingRequest {
 168     int render_process_id;
 169     int render_view_id;
 170     int page_id;
 171     std::string source_lang;
 172     std::string target_lang;
 173   };
 174
 175   // Starts the translation process on |tab| containing the page in the
 176   // |page_lang| language.
 177   void InitiateTranslation(content::WebContents* web_contents,
 178                            const std::string& page_lang);
 179
 180   // If the tab identified by |process_id| and |render_id| has been closed, this
 181   // does nothing, otherwise it calls InitiateTranslation.
 182   void InitiateTranslationPosted(int process_id, int render_id,
 183                                  const std::string& page_lang, int attempt);
 184
 185   // Sends a translation request to the RenderView of |web_contents|.
 186   void DoTranslatePage(content::WebContents* web_contents,
 187                        const std::string& translate_script,
 188                        const std::string& source_lang,
 189                        const std::string& target_lang);
 190
 191   // Shows the after translate or error infobar depending on the details.
 192   void PageTranslated(content::WebContents* web_contents,
 193                       PageTranslatedDetails* details);
 194
 195   void OnTranslateScriptFetchComplete(bool success, const std::string& data);
 196
 197   // Notifies to the observers when a language is detected.
 198   void NotifyLanguageDetection(const LanguageDetectionDetails& details);
 199
 200   // Notifies to the observers when translate failed.
 201   void NotifyTranslateError(const TranslateErrorDetails& details);
 202
 203   // Shows the translate bubble.
 204   void ShowBubble(content::WebContents* web_contents,
 205                   TranslateBubbleModel::ViewState view_state,
 206                   TranslateErrors::Type error_type);
 207
 208   // Returns the different parameters used to decide whether extra shortcuts
 209   // are needed.
 210   static ShortcutConfiguration ShortcutConfig();
 211
 212   content::NotificationRegistrar notification_registrar_;
 213
 214   // Max number of attempts before checking if a page has been reloaded.
 215   int max_reload_check_attempts_;
 216
 217   // The list of pending translate requests.  Translate requests are queued when
 218   // the translate script is not ready and has to be fetched from the translate
 219   // server.
 220   std::vector<PendingRequest> pending_requests_;
 221
 222   // List of registered observers.
 223   ObserverList<Observer> observer_list_;
 224
 225   // An instance of TranslateLanguageList which manages supported language list.
 226   scoped_ptr<TranslateLanguageList> language_list_;
 227
 228   // An instance of TranslateScript which manages JavaScript source for
 229   // Translate.
 230   scoped_ptr<TranslateScript> script_;
 231
 232   // An instance of TranslateAcceptLanguages which manages Accept languages of
 233   // each profiles.
 234   scoped_ptr<TranslateAcceptLanguages> accept_languages_;
 235
 236   base::WeakPtrFactory<TranslateManager> weak_method_factory_;
 237
 238   DISALLOW_COPY_AND_ASSIGN(TranslateManager);
 239 };
 240
 241 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_