I need to talk to a telegram bot, with my web app. So i decided to do a web scrapping, i do not know if its the best strategy.
When i try to access the telegram web, i need to authenticate and then proceed to the chat, but if i run the server again, i need to authenticate manually again. I tried to save the cookies, the waitForTimeout is 200 seconds, so i can login manually, but the cookies came as an empty array.
const puppeteer = require("puppeteer");
const fs = require("fs").promises;
(async () => {
const browser = await puppeteer.launch({ headless: false, executablePath: 'C:\\Program Files\\Google\\Chrome\\Application\\chrome' });
const page = await browser.newPage();
await page.goto("https://web.telegram.org/k/");
console.log('before waiting');
await page.waitForTimeout(200000)
console.log('after waiting');
const cookies = await page.cookies();
await fs.writeFile('./coockie.json', JSON.stringify(cookies, null, 2));
// await browser.close();
})();
It is quite difficult to authenticate in Telegram using puppeteer.
Part 1 Collecting data
First of all we need to collect localStorage (maybe even only localStorage).
If we also want to collect all cookies, we have to drope page.cookies(); and use page._client.send('Network.getAllCookies');instead.
Run this code to collect the necessary data
import puppeteer from 'puppeteer';
import { setTimeout as wait } from 'timers/promises';
import fs from 'fs';
(async () => {
const browser = await puppeteer.launch({ headless: false });
const page = await browser.newPage();
await page.goto('https://web.telegram.org/z/');
await wait(60000); //We need this in order to have time for qr-code authentication
const localStorageData = await page.evaluate(() => {
let json = {};
for (let i = 0; i < localStorage.length; i++) {
const key = localStorage.key(i);
json[key] = localStorage.getItem(key);
}
return json;
});
await fs.writeFile('localStorageData.json', JSON.stringify(localStorageData, null, 2), function(error, data){
if(error) throw error;
console.log(data);
});
const cookies = await page._client.send('Network.getAllCookies');
await fs.writeFile('cookies.json', JSON.stringify(cookies, null, 2), function(error, data){
if(error) throw error;
console.log(data);
});
await browser.close()
})();
Part 2 Using collected data for auntification
Before we start, we need to open our file cookies.json. If it looks like this:
{
"cookies": [
{
//some data
},
{
//some data
}
]
}
then it must be manually corrected to this look
[
{
//some data
},
{
//some data
}
]
ok, the file has been corrected, go ahead
Run this code to authenticate
import puppeteer from 'puppeteer';
import { setTimeout as wait } from 'timers/promises';
import fs from 'fs';
(async () => {
const browser = await puppeteer.launch({ headless: false });
const page = await browser.newPage();
await page.goto('https://web.telegram.org');// here without /z/, with z for some reason it doesn't work
await fs.readFile('./cookies.json', async (err, data) => {
if (err){
console.log(err);
} else {
let json = JSON.parse(data);
await page.setCookie(...json);
console.log(json);
//your code using json object
}
});
await fs.readFile('./localStorageData.json', async (err, data) => {
if (err){
console.log(err);
} else {
let json = JSON.parse(data);
await page.evaluate(localStorageData => {
localStorage.clear();
for (let key in localStorageData) {
console.log(key);
localStorage.setItem(key, localStorageData[key]);
}
}, json);
console.log(json);
}
});
await wait(50000);
await browser.close()
})();
That's all. I recommend you to use playwright instead of puppeteer. Much easier to use and more understandable