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      1 // Copyright (c) 2013 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_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
      6 #define CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/callback.h"
     12 #include "base/compiler_specific.h"
     13 #include "base/files/file_path.h"
     14 #include "base/memory/ref_counted.h"
     15 #include "ppapi/c/pp_instance.h"
     16 
     17 class Profile;
     18 
     19 namespace content {
     20 class BrowserPpapiHost;
     21 }
     22 
     23 namespace user_prefs {
     24 class PrefRegistrySyncable;
     25 }
     26 
     27 namespace chrome {
     28 
     29 // This class allows asynchronously fetching a unique device ID. The callback
     30 // passed in when calling Start() will be called when the ID has been fetched
     31 // or on error.
     32 class DeviceIDFetcher : public base::RefCountedThreadSafe<DeviceIDFetcher> {
     33  public:
     34   typedef base::Callback<void(const std::string&)> IDCallback;
     35 
     36   explicit DeviceIDFetcher(int render_process_id);
     37 
     38   // Schedules the request operation. Returns false if a request is in progress,
     39   // true otherwise.
     40   bool Start(const IDCallback& callback);
     41 
     42   // Called to register the |kEnableDRM| and |kDRMSalt| preferences.
     43   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* prefs);
     44 
     45   // Return the path where the legacy device ID is stored (for ChromeOS only).
     46   static base::FilePath GetLegacyDeviceIDPath(
     47       const base::FilePath& profile_path);
     48 
     49  private:
     50   ~DeviceIDFetcher();
     51 
     52   // Checks the preferences for DRM (whether DRM is enabled and getting the drm
     53   // salt) on the UI thread. These are passed to |ComputeOnIOThread|.
     54   void CheckPrefsOnUIThread();
     55 
     56   // Compute the device ID on the IO thread with the given salt.
     57   void ComputeOnIOThread(const std::string& salt);
     58   // Legacy method used to get the device ID for ChromeOS.
     59   void ComputeOnBlockingPool(const base::FilePath& profile_path,
     60                              const std::string& salt);
     61 
     62   // Runs the callback passed into Start() on the IO thread with the device ID
     63   // or the empty string on failure.
     64   void RunCallbackOnIOThread(const std::string& id);
     65 
     66   // Helper which returns an ID unique to the system. Returns an empty string if
     67   // the call fails.
     68   std::string GetMachineID();
     69 
     70   friend class base::RefCountedThreadSafe<DeviceIDFetcher>;
     71 
     72   // The callback to run when the ID has been fetched.
     73   IDCallback callback_;
     74 
     75   // Whether a request is in progress.
     76   bool in_progress_;
     77 
     78   int render_process_id_;
     79 
     80   DISALLOW_COPY_AND_ASSIGN(DeviceIDFetcher);
     81 };
     82 
     83 }  // namespace chrome
     84 
     85 #endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_DEVICE_ID_FETCHER_H_
     86