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LOGIN_WITH_TELEGRAM.md

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Login with Telegram

Setup your bot

First you have to link your domain to the bot, send the /setdomain command to @Botfather.

Configure bundle

Next enable the Telegram Authenticator: config/packages/boshurik_telegram_bot.yaml

boshurik_telegram_bot:
  # ...
  guard:
    default_target_route: user_profile  # redirect after login success
    guard_route: _telegram_login        # guard route
    login_route: your_login_route       # optional, if login fails user will be redirected there

Generate login widget

In the end you can place a login widget in your login page:

  • Open https://core.telegram.org/widgets/login#widget-configuration
  • In Authorization Type choose Redirect to URL option and insert your callback url matching guard_route configured before. (Help: to discover your guard callback url run bin/console debug:router _telegram_login)
  • Copy&Paste the generated snippet code into your login.html.twig template.

Configure Symfony's firewall

config/packages/security.yaml

security:
  firewalls:
    telegram_bot:
      pattern: ^/_telegram/<a_secret_token>$
      security: false
    main:
      guard: 
        authenticators:
          - BoShurik\TelegramBotBundle\Guard\TelegramAuthenticator
      # ...

If you are using both classic (username and password form) and Telegram login widget, you need to add both authenticators to the guard

security:
  firewalls:
    # ...
    main:
      guard:
        authenticators:
          - App\Security\LoginFormAuthenticator
          - BoShurik\TelegramBotBundle\Guard\TelegramAuthenticator
        entry_point: App\Security\LoginFormAuthenticator
      # ...

Implement UserProvider

Authenticator should return an Symfony\Component\Security\Core\User\UserInterface instance

UserProvider.php

<?php

namespace App\Security;

use App\Models\Entity\User;
use BoShurik\TelegramBotBundle\Guard\UserFactoryInterface;
use BoShurik\TelegramBotBundle\Guard\UserLoaderInterface;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Security\Core\User\UserInterface;

class UserProvider implements UserLoaderInterface, UserFactoryInterface
{
    private $entityManager;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->entityManager = $entityManager;
    }

    public function loadByTelegramId(string $id): ?UserInterface
    {
        return $this->entityManager->getRepository(User::class)->findOneBy(['telegram.id' => $id]);
    }

    public function createFromTelegram(array $data): UserInterface
    {
        $user = new User(
            $data['id'],
            $data['first_name'].' '.$data['last_name'],
            $data['username'] ?? null,
            $data['photo_url'] ?? null
        );

        $this->entityManager->persist($user);
        $this->entityManager->flush();

        return $user;
    }
}

Note: Implementing UserFactoryInterface is optional, it is required if you want to allow to login all your bot users, else the login will be limited to the only already stored in your database.

Autowiring

config/services.yaml

services:
  BoShurik\TelegramBotBundle\Guard\UserLoaderInterface: '@App\Security\UserProvider'
  BoShurik\TelegramBotBundle\Guard\UserFactoryInterface: '@App\Security\UserProvider'

Bot

Set domain in @BotFather for your bot with /setdomain command

Widget

Place widget obtained from https://core.telegram.org/widgets/login on your site