Telegram API Question posted in
A comprehensive official documentation can be found here.

How should I download received files from telegram api

I just want to download images received by my telegram bot with nodejs but I dont know witch method to use. I’m using node-telegram-bot-api and I tried this code :

bot.on('message', (msg) => {
    const img = bot.getFileLink(msg.photo[0].file_id);

    console.log(img);
});

That’s the result:

Promise [Object] {
  _bitField: 0,
  _fulfillmentHandler0: undefined,
  _rejectionHandler0: undefined,
  _promise0: undefined,
  _receiver0: undefined,
  _cancellationParent:
   Promise [Object] {
     _bitField: 1,
     _fulfillmentHandler0: [Function],
     _rejectionHandler0: undefined,
     _promise0: [Circular],
     _receiver0: undefined,
     _cancellationParent:
      Promise [Object] {
        _bitField: 1,
        _fulfillmentHandler0: undefined,
        _rejectionHandler0: [Function],
        _promise0: [Circular],
        _receiver0: undefined,
        _cancellationParent: [Promise],
        _branchesRemainingToCancel: 1 },
     _branchesRemainingToCancel: 1 } }
Tags:

4

Answers


  1. 0 
    bot.on('message', async (msg) => {
    if (msg.photo && msg.photo[0]) {
        const image = await bot.getFile({ file_id: msg.photo[0].file_id });
        console.log(image);
    }
});

    https://github.com/mast/telegram-bot-api/blob/master/lib/telegram-bot.js#L1407

    Login or Signup to reply.
  2. 0 
      bot.getFile(msg.document.file_id).then((resp) => {
             console.log(resp)
         })
    Login or Signup to reply.
  3. 0

    There’re three steps: An api request to get the "file directory" on Telegram. Use that "file directory" to create the "download URL". Use "request" module to download the file.

    const fs = require('fs');
const request = require('request');
require('dotenv').config();
const path = require('path');
const fetch = require('node-fetch');

// this is used to download the file from the link
const download = (url, path, callback) => {
    request.head(url, (err, res, body) => {
    request(url).pipe(fs.createWriteStream(path)).on('close', callback);
  });
};
// handling incoming photo or any other file
bot.on('photo', async (doc) => {

    // there's other ways to get the file_id we just need it to get the download link
    const fileId = doc.update.message.photo[0].file_id;

    // an api request to get the "file directory" (file path)
    const res = await fetch(
      `https://api.telegram.org/bot${process.env.BOT_TOKEN}/getFile?file_id=${fileId}`
    );
    // extract the file path
    const res2 = await res.json();
    const filePath = res2.result.file_path;

    // now that we've "file path" we can generate the download link
    const downloadURL = 
      `https://api.telegram.org/file/bot${process.env.BOT_TOKEN}/${filePath}`;

    // download the file (in this case it's an image)
    download(downloadURL, path.join(__dirname, `${fileId}.jpg`), () =>
      console.log('Done!')
     );
});

    Links that may help: https://core.telegram.org/bots/api#file and https://core.telegram.org/bots/api#getfile

    Login or Signup to reply.
  4. 0

    For node-telegram-bot-api should be :

    const fileInfo= await bot.getFile(msg.photo[0].file_id);

    Sample response :

    {
  file_id: 'CgACAgQAAxkBAAIM_GLOjbnjU9mixP_6pdgpGOSgMQppAAIaAwAC0qkEUybVrAABHF2knCkE',
  file_unique_id: 'AgADGgMAAtKpBFM',
  file_size: 283369,
  file_path: 'animations/file_101.mp4'
}

    or you can get download link by calling getFileLink :

    const fileLink= await bot.getFile(msg.photo[0].file_id);

    Result will be a string like :

    https://api.telegram.org/file/bot11111111:AAGKlSEZSe_F0E6KouT2B5W77TmqpiQJtGQ/animations/file_101.mp4

    or you can get download file using streams :

    let fileWriter= fs.createWriteStream('myData.bin'); //creating stream for writing to file

//wrap to promise to use await as streams are not async/await based (they are based on events)
const getReadStreamPromise = () => {
        return new Promise((resolve, reject) => {
            const stream = bot.getFileStream(body.Message.FileId); //getting strean to file bytes
            stream.on('data', (chunk) => {
                console.log('getting data')
                fileWriter.write(chunk); //copying to our file chunk by chunk
            })
            stream.on('error', (err) => {
                console.log('err')
                reject(err);
            })
            stream.on('end', () => {
                console.log('end')
                resolve();
            })

        })
    }
    console.log('Start file downloading and saving');
    await getReadStreamPromise(); 
    console.log('File saved');

    so your file will be saved to myData.bin file

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search