sendSticker method

Future<Message> sendSticker(dynamic chat_id, dynamic sticker, { bool? disable_notification, int? reply_to_message_id, bool? allow_sending_without_reply, ReplyMarkup? reply_markup, })

Use this method to send .webp stickers

On success, the sent Message is returned.

https://core.telegram.org/bots/api#sendsticker

Implementation

Future<Message> sendSticker(dynamic chat_id, dynamic sticker,
    {bool? disable_notification,
    int? reply_to_message_id,
    bool? allow_sending_without_reply,
    ReplyMarkup? reply_markup}) async {
  if (chat_id is! String && chat_id is! int) {
    return Future.error(TelegramException(
        'Attribute \'chat_id\' can only be either type of String or int'));
  }
  var requestUrl = _apiUri('sendSticker');
  var body = <String, dynamic>{
    'chat_id': chat_id,
    'disable_notification': disable_notification,
    'reply_to_message_id': reply_to_message_id,
    'allow_sending_without_reply': allow_sending_without_reply,
    'reply_markup': reply_markup == null ? null : jsonEncode(reply_markup),
  };

  if (sticker is io.File) {
    // filename cannot be empty to post to Telegram server
    var files = List<MultipartFile>.filled(
        1,
        MultipartFile('sticker', sticker.openRead(), sticker.lengthSync(),
            filename: '${sticker.lengthSync()}'));
    return Message.fromJson(
        await HttpClient.httpMultipartPost(requestUrl, files, body: body));
  } else if (sticker is String) {
    body.addAll({'sticker': sticker});
    return Message.fromJson(
        await HttpClient.httpPost(requestUrl, body: body));
  } else {
    return Future.error(TelegramException(
        'Attribute \'sticker\' can only be either io.File or String (Telegram file_id or image url)'));
  }
}