buildWidgetUrl method

Future<Uri> buildWidgetUrl()

Implementation

Future<Uri> buildWidgetUrl() async {
  // See https://github.com/matrix-org/matrix-doc/issues/1236 for a
  // description, specifically the section
  // `What does the other stuff in content mean?`
  final userProfile = await room.client.getUserProfile(room.client.userID!);
  var parsedUri = url;

  // a key-value map with the strings to be replaced
  final replaceMap = {
    r'$matrix_user_id': room.client.userID!,
    r'$matrix_room_id': room.id,
    r'$matrix_display_name': userProfile.displayname ?? '',
    r'$matrix_avatar_url': userProfile.avatarUrl?.toString() ?? '',
    // removing potentially dangerous keys containing anything but
    // `[a-zA-Z0-9_-]` as well as non string values
    if (data != null)
      ...Map.from(data!)
        ..removeWhere(
          (key, value) =>
              !RegExp(r'^[\w-]+$').hasMatch(key) || !value is String,
        )
        ..map((key, value) => MapEntry('\$key', value)),
  };

  replaceMap.forEach((key, value) {
    parsedUri = parsedUri.replaceAll(key, Uri.encodeComponent(value));
  });

  return Uri.parse(parsedUri);
}