sendAnimation method

Future<Message> sendAnimation(dynamic chat_id, dynamic animation, { int? duration, int? width, int? height, dynamic thumb, String? caption, String? parse_mode, List<MessageEntity>? caption_entities, bool? disable_notification, int? reply_to_message_id, bool? allow_sending_without_reply, ReplyMarkup? reply_markup, })

Use this method to send animation files (GIF or H.264/MPEG-4 AVC video without sound)

On success, the sent Message is returned. Bots can currently send animation files of up to 50 MB in size, this limit may be changed in the future.

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

Implementation

Future<Message> sendAnimation(dynamic chat_id, dynamic animation,
    {int? duration,
    int? width,
    int? height,
    dynamic thumb,
    String? caption,
    String? parse_mode,
    List<MessageEntity>? caption_entities,
    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('sendAnimation');
  var body = <String, dynamic>{
    'chat_id': chat_id,
    'duration': duration,
    'width': width,
    'height': height,
    'caption': caption,
    'parse_mode': parse_mode,
    'caption_entities':
        caption_entities == null ? null : jsonEncode(caption_entities),
    '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),
  };

  var multiPartFiles = <MultipartFile>[];

  if (animation is io.File) {
    multiPartFiles.add(HttpClient.toMultiPartFile(animation, 'animation'));
  } else if (animation is String) {
    body.addAll({'animation': animation});
  } else {
    return Future.error(TelegramException(
        'Attribute \'animation\' can only be either io.File or String (Telegram file_id or image url)'));
  }

  if (thumb != null) {
    if (thumb is io.File) {
      multiPartFiles.add(HttpClient.toMultiPartFile(thumb, 'thumb'));
    } else if (thumb is String) {
      body.addAll({'thumb': thumb});
    } else {
      return Future.error(TelegramException(
          'Attribute \'thumb\' can only be either io.File or String (Telegram file_id or image url)'));
    }
  }

  return multiPartFiles.isEmpty
      ? Message.fromJson(await HttpClient.httpPost(requestUrl, body: body))
      : Message.fromJson(await HttpClient.httpMultipartPost(
          requestUrl, multiPartFiles,
          body: body));
}