[Presentation API] (MR side) 1-UA: notify receiver page when receiver connection becomes available

chrome/browser/media/router/receiver_presentation_service_delegate_impl.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_RECEIVER_PRESENTATION_SERVICE_DELEGATE_IMPL_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_RECEIVER_PRESENTATION_SERVICE_DELEGATE_IMPL_H_
+
+#include <map>
+
+#include "base/observer_list.h"
+#include "chrome/browser/media/router/offscreen_presentation_manager.h"
+#include "chrome/browser/media/router/offscreen_presentation_manager_factory.h"
+#include "chrome/browser/media/router/render_frame_host_id.h"
+#include "content/public/browser/presentation_service_delegate.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+namespace content {
+class RenderFrameHost;
+class WebContents;
+struct PresentationSessionInfo;
+struct PresentationSessionMessage;
+}  // namespace content
+
+namespace media_router {
+
+// Implements the receiver side of presentation API for offscreen presentations.
+// Created under the offscreen tab WebContents when the tab is created for an
+// offscreen presentation. Each instance is tied to a single offscreen
+// presentation whose ID is given during construction. As such, the receiver
+// APIs are contextual with the offscreen presentation.
+// Only the main frame of the offscreen tab is allowed to make receiver
+// Presentation API requests; requests made from any other frame will be
+// rejected.
+class ReceiverPresentationServiceDelegateImpl
+    : public content::WebContentsUserData<
+          ReceiverPresentationServiceDelegateImpl>,
+      public content::PresentationServiceDelegate {
+ public:
+  // Creates an instance of ReceiverPresentationServiceDelegateImpl under
+  // |web_contents| and registers it as the receiver of the offscreen
+  // presentation |presentation_id| with OffscreenPresentationManager.
+  // No-op if a ReceiverPresentationServiceDelegateImpl instance already
+  // exists under |web_contents|.
+  static void CreateForWebContents(content::WebContents* web_contents,
+                                   const std::string& presentation_id);
+
+  ~ReceiverPresentationServiceDelegateImpl() override;
+
+  // content::PresentationServiceDelegate implementation.
+  void AddObserver(
+      int render_process_id,
+      int render_frame_id,
+      content::PresentationServiceDelegate::Observer* observer) override;
+  void RemoveObserver(int render_process_id, int render_frame_id) override;
+  bool AddScreenAvailabilityListener(
+      int render_process_id,
+      int render_frame_id,
+      content::PresentationScreenAvailabilityListener* listener) override;
+  void RemoveScreenAvailabilityListener(
+      int render_process_id,
+      int render_frame_id,
+      content::PresentationScreenAvailabilityListener* listener) override;
+  void Reset(int render_process_id, int render_frame_id) override;
+  void SetDefaultPresentationUrls(
+      int render_process_id,
+      int render_frame_id,
+      const std::vector<std::string>& default_presentation_urls,
+      const content::PresentationSessionStartedCallback& callback) override;
+  void StartSession(
+      int render_process_id,
+      int render_frame_id,
+      const std::vector<std::string>& presentation_urls,
+      const content::PresentationSessionStartedCallback& success_cb,
+      const content::PresentationSessionErrorCallback& error_cb) override;
+  void JoinSession(
+      int render_process_id,
+      int render_frame_id,
+      const std::vector<std::string>& presentation_urls,
+      const std::string& presentation_id,
+      const content::PresentationSessionStartedCallback& success_cb,
+      const content::PresentationSessionErrorCallback& error_cb) override;
+  void CloseConnection(int render_process_id,
+                       int render_frame_id,
+                       const std::string& presentation_id) override;
+  void Terminate(int render_process_id,
+                 int render_frame_id,
+                 const std::string& presentation_id) override;
+  void ListenForSessionMessages(
+      int render_process_id,
+      int render_frame_id,
+      const content::PresentationSessionInfo& session_info,
+      const content::PresentationSessionMessageCallback& message_cb) override;
+  void SendMessage(int render_process_id,
+                   int render_frame_id,
+                   const content::PresentationSessionInfo& session_info,
+                   std::unique_ptr<content::PresentationSessionMessage> message,
+                   const SendMessageCallback& send_message_cb) override;
+  void ListenForConnectionStateChange(
+      int render_process_id,
+      int render_frame_id,
+      const content::PresentationSessionInfo& connection,
+      const content::PresentationConnectionStateChangedCallback&
+          state_changed_cb) override;
+
+  void RegisterOffscreenPresentationReceiver(
+      content::OffscreenPresentationClient*) override;
+
+  void UnregisterOffscreenPresentationReceiver(
+      content::OffscreenPresentationClient*) override;
+
+  void RegisterOffscreenPresentationController(
+      const std::string& presentation_id,
+      content::OffscreenPresentationClient*) override {}
+
+  void UnregisterOffscreenPresentationController(
+      const std::string& presentation_id,
+      content::OffscreenPresentationClient*) override {}
+
+ private:
+  friend class content::WebContentsUserData<
+      ReceiverPresentationServiceDelegateImpl>;
+
+  explicit ReceiverPresentationServiceDelegateImpl(
+      content::WebContents* web_contents,
+      const std::string& presentation_id);
+
+  // Reference to the WebContents that owns this instance.
+  content::WebContents* const web_contents_;
+
+  const std::string presentation_id_;
+  OffscreenPresentationManager* const offscreen_presentation_manager_;
+  std::map<RenderFrameHostId, content::PresentationServiceDelegate::Observer*>
+      observers_;
+
+  // Set to the current main frame of the owning WebContents on first request,
+  // and unset when Reset() is called with current main frame. When this is
+  // set, incoming requests except Reset() will be rejected if it does not match
+  // the incoming frame.
+  RenderFrameHostId current_frame_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReceiverPresentationServiceDelegateImpl);
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_RECEIVER_PRESENTATION_SERVICE_DELEGATE_IMPL_H_