sendPhoto method

Future<Message> sendPhoto(dynamic chat_id, dynamic photo, { 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 photos

On success, the sent Message is returned.

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

Implementation

Future<Message> sendPhoto(dynamic chat_id, dynamic photo,
    {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('sendPhoto');
  var body = <String, dynamic>{
    'chat_id': chat_id,
    '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 (photo is io.File) {
    multiPartFiles.add(HttpClient.toMultiPartFile(photo, 'photo'));
  } else if (photo is String) {
    body.addAll({'photo': photo});
  } else {
    return Future.error(TelegramException(
        'Attribute \'photo\' 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));
}