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      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_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
      6 #define CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/compiler_specific.h"
     11 #include "base/prefs/pref_change_registrar.h"
     12 #include "chrome/browser/extensions/external_loader.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 
     16 class Profile;
     17 
     18 namespace base {
     19 class DictionaryValue;
     20 }
     21 
     22 namespace extensions {
     23 
     24 // A specialization of the ExternalProvider that uses
     25 // prefs::kExtensionInstallForceList to look up which external extensions are
     26 // registered.
     27 class ExternalPolicyLoader
     28     : public ExternalLoader,
     29       public content::NotificationObserver {
     30  public:
     31   explicit ExternalPolicyLoader(Profile* profile);
     32 
     33   // content::NotificationObserver implementation
     34   virtual void Observe(int type,
     35                        const content::NotificationSource& source,
     36                        const content::NotificationDetails& details) OVERRIDE;
     37 
     38   // Adds an extension to be updated to the pref dictionary.
     39   static void AddExtension(base::DictionaryValue* dict,
     40                            const std::string& extension_id,
     41                            const std::string& update_url);
     42 
     43  protected:
     44   virtual void StartLoading() OVERRIDE;
     45 
     46  private:
     47   friend class base::RefCountedThreadSafe<ExternalLoader>;
     48 
     49   virtual ~ExternalPolicyLoader() {}
     50 
     51   PrefChangeRegistrar pref_change_registrar_;
     52   content::NotificationRegistrar notification_registrar_;
     53 
     54   Profile* profile_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(ExternalPolicyLoader);
     57 };
     58 
     59 }  // namespace extensions
     60 
     61 #endif  // CHROME_BROWSER_EXTENSIONS_EXTERNAL_POLICY_LOADER_H_
     62