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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_DESKTOP_STREAMS_REGISTRY_H_
      6 #define CHROME_BROWSER_MEDIA_DESKTOP_STREAMS_REGISTRY_H_
      7 
      8 #include <map>
      9 #include <string>
     10 
     11 #include "chrome/browser/media/desktop_media_list.h"
     12 #include "url/gurl.h"
     13 
     14 // DesktopStreamsRegistry is used to store accepted desktop media streams for
     15 // Desktop Capture API. Single instance of this class is created per browser in
     16 // MediaCaptureDevicesDispatcher.
     17 class DesktopStreamsRegistry {
     18  public:
     19   DesktopStreamsRegistry();
     20   ~DesktopStreamsRegistry();
     21 
     22   // Adds new stream to the registry. Called by the implementation of
     23   // desktopCapture.chooseDesktopMedia() API after user has approved access to
     24   // |source| for the |origin|. Returns identifier of the new stream.
     25   std::string RegisterStream(int render_process_id,
     26                              int render_view_id,
     27                              const GURL& origin,
     28                              const content::DesktopMediaID& source,
     29                              const std::string& extension_name);
     30 
     31   // Validates stream identifier specified in getUserMedia(). Returns null
     32   // DesktopMediaID if the specified |id| is invalid, i.e. wasn't generated
     33   // using RegisterStream() or if it was generated for a different origin.
     34   // Otherwise returns ID of the source and removes it from the registry.
     35   content::DesktopMediaID RequestMediaForStreamId(const std::string& id,
     36                                                   int render_process_id,
     37                                                   int render_view_id,
     38                                                   const GURL& origin,
     39                                                   std::string* extension_name);
     40 
     41  private:
     42   // Type used to store list of accepted desktop media streams.
     43   struct ApprovedDesktopMediaStream {
     44     ApprovedDesktopMediaStream();
     45 
     46     int render_process_id;
     47     int render_view_id;
     48     GURL origin;
     49     content::DesktopMediaID source;
     50     std::string extension_name;
     51   };
     52   typedef std::map<std::string, ApprovedDesktopMediaStream> StreamsMap;
     53 
     54   // Helper function that removes an expired stream from the registry.
     55   void CleanupStream(const std::string& id);
     56 
     57   StreamsMap approved_streams_;
     58 
     59   DISALLOW_COPY_AND_ASSIGN(DesktopStreamsRegistry);
     60 };
     61 
     62 #endif  // CHROME_BROWSER_MEDIA_DESKTOP_STREAMS_REGISTRY_H_
     63