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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_CHROMEOS_POLICY_USER_POLICY_TOKEN_LOADER_H_
      6 #define CHROME_BROWSER_CHROMEOS_POLICY_USER_POLICY_TOKEN_LOADER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/files/file_path.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/weak_ptr.h"
     14 
     15 namespace base {
     16 class SequencedTaskRunner;
     17 }
     18 
     19 namespace policy {
     20 
     21 // Handles disk access and threading details for loading and storing tokens.
     22 // This is legacy-support code that reads the token from its prior location
     23 // within the profile directory new code keeps the token in the policy blob
     24 // maintained by session_manager.
     25 class UserPolicyTokenLoader
     26     : public base::RefCountedThreadSafe<UserPolicyTokenLoader> {
     27  public:
     28   // Callback interface for reporting a successful load.
     29   class Delegate {
     30    public:
     31     virtual ~Delegate();
     32     virtual void OnTokenLoaded(const std::string& token,
     33                                const std::string& device_id) = 0;
     34   };
     35 
     36   UserPolicyTokenLoader(
     37       const base::WeakPtr<Delegate>& delegate,
     38       const base::FilePath& cache_file,
     39       scoped_refptr<base::SequencedTaskRunner> background_task_runner);
     40 
     41   // Starts loading the disk cache. After the load is finished, the result is
     42   // reported through the delegate.
     43   void Load();
     44 
     45  private:
     46   friend class base::RefCountedThreadSafe<UserPolicyTokenLoader>;
     47   ~UserPolicyTokenLoader();
     48 
     49   void LoadOnBackgroundThread();
     50   void NotifyOnOriginThread(const std::string& token,
     51                         const std::string& device_id);
     52 
     53   const base::WeakPtr<Delegate> delegate_;
     54   const base::FilePath cache_file_;
     55   scoped_refptr<base::SequencedTaskRunner> origin_task_runner_;
     56   scoped_refptr<base::SequencedTaskRunner> background_task_runner_;
     57 
     58   DISALLOW_COPY_AND_ASSIGN(UserPolicyTokenLoader);
     59 };
     60 
     61 }  // namespace policy
     62 
     63 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_USER_POLICY_TOKEN_LOADER_H_
     64