// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_MEDIA_MEDIA_DEVICES_PERMISSION_CHECKER_H_
#define CONTENT_BROWSER_MEDIA_MEDIA_DEVICES_PERMISSION_CHECKER_H_

#include "base/functional/callback.h"
#include "content/browser/renderer_host/media/media_devices_manager.h"
#include "content/common/content_export.h"

using blink::mojom::MediaDeviceType;

namespace content {

struct GlobalRenderFrameHostId;

// This class provides various utility functions to check if a render frame
// has permission to access media devices. Note that none of the methods
// prompts the user to request permission.
class CONTENT_EXPORT MediaDevicesPermissionChecker {
 public:
  MediaDevicesPermissionChecker();

  // This constructor creates a MediaDevicesPermissionChecker that replies
  // |override_value| to all permission requests. Use only for testing.
  explicit MediaDevicesPermissionChecker(bool override_value);

  MediaDevicesPermissionChecker(const MediaDevicesPermissionChecker&) = delete;
  MediaDevicesPermissionChecker& operator=(
      const MediaDevicesPermissionChecker&) = delete;

  // Checks if the origin associated with |render_frame_host_id| is allowed to
  // access the media device type |device_type|.
  // This method must be called on the UI thread.
  bool CheckPermissionOnUIThread(
      MediaDeviceType device_type,
      GlobalRenderFrameHostId render_frame_host_id) const;

  // This function checks the state of the speaker selection and microphone
  // permissions for the SelectAudioOutput API. The speaker selection state is
  // returned as denied/not denied via the first parameter of `callback` and
  // the microphone permission state is returned as a bool (true for allowed,
  // false for not allowed) via the second parameter of `callback`.
  void GetSpeakerSelectionAndMicrophonePermissionState(
      GlobalRenderFrameHostId render_frame_host_id,
      base::OnceCallback<void(MediaDevicesManager::PermissionDeniedState, bool)>
          callback) const;

  // Checks if the origin associated with |render_frame_host_id| is allowed to
  // access the media device type |device_type|. The result is passed to
  // |callback|.
  // This method can be called on any thread. |callback| is fired on the same
  // thread this method is called on.
  void CheckPermission(MediaDeviceType device_type,
                       GlobalRenderFrameHostId render_frame_host_id,
                       base::OnceCallback<void(bool)> callback) const;

  // Checks if the origin associated with |render_frame_host_id| is allowed to
  // access the media device types marked with a value of true in
  // |requested_device_types|. The result is passed to |callback| and indexed by
  // blink::mojom::MediaDeviceType. Entries with a value of true for requested
  // device types indicate that the frame has permission to access devices of
  // the corresponding types. This method can be called on any thread.
  // |callback| is fired on the same thread this method is called on.
  void CheckPermissions(
      MediaDevicesManager::BoolDeviceTypes requested_device_types,
      GlobalRenderFrameHostId render_frame_host_id,
      base::OnceCallback<void(const MediaDevicesManager::BoolDeviceTypes&)>
          callback) const;

  // Returns true if the origin associated with |render_frame_host_id| is
  // allowed to control camera movement (pan, tilt, and zoom). Otherwise,
  // returns false.
  static bool HasPanTiltZoomPermissionGrantedOnUIThread(
      GlobalRenderFrameHostId render_frame_host_id);

 private:
  const bool use_override_;
  const bool override_value_;
};

}  // namespace content

#endif  // CONTENT_BROWSER_MEDIA_MEDIA_DEVICES_PERMISSION_CHECKER_H_