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      1 // Copyright 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_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_
      6 #define CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_
      7 
      8 #include "base/memory/scoped_ptr.h"
      9 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
     10 #include "content/public/browser/browser_context.h"
     11 
     12 class GURL;
     13 class PermissionQueueController;
     14 class PermissionRequestID;
     15 class Profile;
     16 
     17 // This class manages MIDI permissions flow. Used on the UI thread.
     18 class ChromeMIDIPermissionContext : public BrowserContextKeyedService {
     19  public:
     20   explicit ChromeMIDIPermissionContext(Profile* profile);
     21   virtual ~ChromeMIDIPermissionContext();
     22 
     23   // BrowserContextKeyedService methods:
     24   virtual void Shutdown() OVERRIDE;
     25 
     26   // Request to ask users permission about MIDI.
     27   void RequestMIDISysExPermission(
     28       int render_process_id,
     29       int render_view_id,
     30       int bridge_id,
     31       const GURL& requesting_frame,
     32       const content::BrowserContext::MIDISysExPermissionCallback& callback);
     33 
     34   // Cancel a pending MIDI permission request.
     35   void CancelMIDISysExPermissionRequest(int render_process_id,
     36                                         int render_view_id,
     37                                         int bridge_id,
     38                                         const GURL& requesting_frame);
     39 
     40  private:
     41   // Decide whether the permission should be granted.
     42   // Calls PermissionDecided if permission can be decided non-interactively,
     43   // or NotifyPermissionSet if permission decided by presenting an infobar.
     44   void DecidePermission(
     45       const PermissionRequestID& id,
     46       const GURL& requesting_frame,
     47       const GURL& embedder,
     48       const content::BrowserContext::MIDISysExPermissionCallback& callback);
     49 
     50   // Called when permission is granted without interactively asking the user.
     51   void PermissionDecided(
     52       const PermissionRequestID& id,
     53       const GURL& requesting_frame,
     54       const GURL& embedder,
     55       const content::BrowserContext::MIDISysExPermissionCallback& callback,
     56       bool allowed);
     57 
     58   // Called when the permission decision is made. It may be by the
     59   // InfoBarDelegate to notify permission has been set.
     60   void NotifyPermissionSet(
     61       const PermissionRequestID& id,
     62       const GURL& requesting_frame,
     63       const content::BrowserContext::MIDISysExPermissionCallback& callback,
     64       bool allowed);
     65 
     66   // Return an instance of the infobar queue controller, creating it if needed.
     67   PermissionQueueController* GetQueueController();
     68 
     69   // Removes any pending InfoBar request.
     70   void CancelPendingInfoBarRequest(const PermissionRequestID& id);
     71 
     72   Profile* const profile_;
     73   bool shutting_down_;
     74   scoped_ptr<PermissionQueueController> permission_queue_controller_;
     75 
     76   DISALLOW_COPY_AND_ASSIGN(ChromeMIDIPermissionContext);
     77 };
     78 
     79 #endif  // CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_
     80