While working on send4me, a message scheduler bot on Telegram, I ran into the question of how my bot can fetch the contents of a document uploaded by a user. I couldn't find a complete example for this use case anywhere, so I put together what worked for me.
The following code snippet recreates the demo above. We will assume that you have already created a bot with BotFather and obtained your bot token.
const Telegraf = require('telegraf');
const axios = require('axios');
const BOT_TOKEN = ''; // TODO: get from BotFather
const bot = new Telegraf(BOT_TOKEN, {
polling: true,
});
bot.start((ctx) => ctx.reply("Hello! Upload any document and I'll read it for you~"));
bot.on('document', async (ctx) => {
const {file_id: fileId} = ctx.update.message.document;
const fileUrl = await ctx.telegram.getFileLink(fileId);
const response = await axios.get(fileUrl);
ctx.reply('I read the file for you! The contents were:\n\n' + response.data);
});
bot.launch();
This should work for simple text files. For more complex files, response.data will need to be parsed before their content is usable.
Top comments (3)
Please can you help out. I want a workflow that when my bot receives the file, it will read the data and send a json format
Can you explain a little bit about {polling: true} ?
how can i use this to read random lines / download random pictures from folder in my telegram bot ?