Introduce chrome.displaySource API

extensions/browser/api/display_source/display_source_connection_delegate.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 EXTENSIONS_BROWSER_API_DISPLAY_SOURCE_DISPLAY_SOURCE_CONNECTION_DELEGATE_H_
+#define EXTENSIONS_BROWSER_API_DISPLAY_SOURCE_DISPLAY_SOURCE_CONNECTION_DELEGATE_H_
+
+#include "base/callback.h"
+#include "base/observer_list.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "extensions/common/api/display_source.h"
+
+namespace extensions {
+
+using DisplaySourceSinkInfoPtr = linked_ptr<api::display_source::SinkInfo>;
+using DisplaySourceSinkInfoList = std::vector<DisplaySourceSinkInfoPtr>;
+using DisplaySourceAuthInfo = api::display_source::AuthenticationInfo;
+
+// The DisplaySourceConnectionDelegate interface should be implemented
+// to provide sinks search and connection functionality for
+// 'chrome.displaySource'
+// API.
+class DisplaySourceConnectionDelegate : public KeyedService {
+ public:
+  using AuthInfoCallback = base::Callback<void(const DisplaySourceAuthInfo&)>;
+  using FailureCallback = base::Callback<void(const std::string&)>;
+  using SinkInfoListCallback =
+      base::Callback<void(const DisplaySourceSinkInfoList&)>;
+
+  struct Connection {
+    Connection();
+    ~Connection();
+    DisplaySourceSinkInfoPtr connected_sink;
+    std::string local_ip;
+    std::string sink_ip;
+  };
+
+  class Observer {
+   public:
+    // This method is called each tiome the list of available
+    // sinks is updated whether after 'GetAvailableSinks' call
+    // or while the implementation is constantly watching the sinks
+    // (after 'StartWatchingSinks' was called).
+    virtual void OnSinksUpdated(const DisplaySourceSinkInfoList& sinks) = 0;
+
+   protected:
+    virtual ~Observer() {}
+  };
+
+  DisplaySourceConnectionDelegate();
+  ~DisplaySourceConnectionDelegate() override;
+
+  virtual void AddObserver(Observer* observer);
+  virtual void RemoveObserver(Observer* observer);
+
+  // Returns the list of last found available sinks
+  // this list may contain outdated data if the delegate
+  // is not watching the sinks (via 'StartWatchingSinks'
+  // method). The list is refreshed after 'GetAvailableSinks'
+  // call.
+  virtual DisplaySourceSinkInfoList last_found_sinks() const = 0;
+
+  // Returns the Connection object representing the current
+  // connection to the sink or NULL if there is no curent connection.
+  virtual const Connection* connection() const = 0;
+
+  // Queries the list of currently available sinks.
+  virtual void GetAvailableSinks(const SinkInfoListCallback& sinks_callback,
+                                 const FailureCallback& failure_callback) = 0;
+
+  // Queries the authentication method required by the sink for connection.
+  // If the used authentication method requires authentication data to be
+  // visible on the sink's display (e.g. PIN) the implementation should
+  // request the sink to show it.
+  virtual void RequestAuthentication(
+      int sink_id,
+      const AuthInfoCallback& auth_info_callback,
+      const FailureCallback& failure_callback) = 0;
+
+  // Connects to a sink by given id and auth info.
+  virtual void Connect(int sink_id,
+                       const DisplaySourceAuthInfo& auth_info,
+                       const base::Closure& connected_callback,
+                       const FailureCallback& failure_callback) = 0;
+
+  // Disconnects the current connection to sink, the 'failure_callback'
+  // is called if there is no current connection.
+  virtual void Disconnect(const base::Closure& disconnected_callback,
+                          const FailureCallback& failure_callback) = 0;
+
+  // Implementation should start watching the sinks updates.
+  virtual void StartWatchingSinks() = 0;
+
+  // Implementation should stop watching the sinks updates.
+  virtual void StopWatchingSinks() = 0;
+
+ protected:
+  base::ObserverList<Observer> observers_;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_DISPLAY_SOURCE_DISPLAY_SOURCE_CONNECTION_DELEGATE_H_