src/chrome/browser/extensions/api/tab_capture/tab_capture_registry.h

   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_API_TAB_CAPTURE_TAB_CAPTURE_REGISTRY_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_TAB_CAPTURE_TAB_CAPTURE_REGISTRY_H_
   7
   8 #include <string>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/memory/scoped_vector.h"
  13 #include "base/scoped_observer.h"
  14 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
  15 #include "chrome/common/extensions/api/tab_capture.h"
  16 #include "content/public/browser/media_request_state.h"
  17 #include "extensions/browser/browser_context_keyed_api_factory.h"
  18 #include "extensions/browser/extension_registry_observer.h"
  19
  20 namespace base {
  21 class ListValue;
  22 }
  23
  24 namespace content {
  25 class BrowserContext;
  26 class WebContents;
  27 }
  28
  29 namespace extensions {
  30
  31 class ExtensionRegistry;
  32
  33 namespace tab_capture = api::tab_capture;
  34
  35 class TabCaptureRegistry : public BrowserContextKeyedAPI,
  36                            public ExtensionRegistryObserver,
  37                            public MediaCaptureDevicesDispatcher::Observer {
  38  public:
  39   static TabCaptureRegistry* Get(content::BrowserContext* context);
  40
  41   // Used by BrowserContextKeyedAPI.
  42   static BrowserContextKeyedAPIFactory<TabCaptureRegistry>*
  43       GetFactoryInstance();
  44
  45   // List all pending, active and stopped capture requests.
  46   void GetCapturedTabs(const std::string& extension_id,
  47                        base::ListValue* list_of_capture_info) const;
  48
  49   // Add a tab capture request to the registry when a stream is requested
  50   // through the API.  |target_contents| refers to the WebContents associated
  51   // with the tab to be captured.  |extension_id| refers to the Extension
  52   // initiating the request.
  53   bool AddRequest(content::WebContents* target_contents,
  54                   const std::string& extension_id);
  55
  56   // Called by MediaStreamDevicesController to verify the request before
  57   // creating the stream.  |render_process_id| and |render_frame_id| are used to
  58   // look-up a WebContents instance, which should match the |target_contents|
  59   // from the prior call to AddRequest().  In addition, a request is not
  60   // verified unless the |extension_id| also matches AND the request itself is
  61   // in the PENDING state.
  62   bool VerifyRequest(int render_process_id,
  63                      int render_frame_id,
  64                      const std::string& extension_id);
  65
  66  private:
  67   friend class BrowserContextKeyedAPIFactory<TabCaptureRegistry>;
  68   class LiveRequest;
  69
  70   explicit TabCaptureRegistry(content::BrowserContext* context);
  71   virtual ~TabCaptureRegistry();
  72
  73   // Used by BrowserContextKeyedAPI.
  74   static const char* service_name() {
  75     return "TabCaptureRegistry";
  76   }
  77
  78   static const bool kServiceIsCreatedWithBrowserContext = false;
  79   static const bool kServiceRedirectedInIncognito = true;
  80
  81   // ExtensionRegistryObserver implementation.
  82   virtual void OnExtensionUnloaded(
  83       content::BrowserContext* browser_context,
  84       const Extension* extension,
  85       UnloadedExtensionInfo::Reason reason) OVERRIDE;
  86
  87   // MediaCaptureDevicesDispatcher::Observer implementation.
  88   virtual void OnRequestUpdate(
  89       int original_target_render_process_id,
  90       int original_target_render_frame_id,
  91       content::MediaStreamType stream_type,
  92       const content::MediaRequestState state) OVERRIDE;
  93
  94   // Send a StatusChanged event containing the current state of |request|.
  95   void DispatchStatusChangeEvent(const LiveRequest* request) const;
  96
  97   // Look-up a LiveRequest associated with the given |target_contents| (or
  98   // the originally targetted RenderFrameHost), if any.
  99   LiveRequest* FindRequest(const content::WebContents* target_contents) const;
 100   LiveRequest* FindRequest(int original_target_render_process_id,
 101                            int original_target_render_frame_id) const;
 102
 103   // Removes the |request| from |requests_|, thus causing its destruction.
 104   void KillRequest(LiveRequest* request);
 105
 106   content::BrowserContext* const browser_context_;
 107   ScopedVector<LiveRequest> requests_;
 108
 109   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
 110       extension_registry_observer_;
 111
 112   DISALLOW_COPY_AND_ASSIGN(TabCaptureRegistry);
 113 };
 114
 115 }  // namespace extensions
 116
 117 #endif  // CHROME_BROWSER_EXTENSIONS_API_TAB_CAPTURE_TAB_CAPTURE_REGISTRY_H_