Telegraf Authentication Middleware

A simple authentication middleware for the telegraf framework.

npm install @yeldirium/telegraf-authentication-middleware
# or
yarn install @yeldirium/telegraf-authentication-middleware

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Why this module?

If you have a telegram application and want to let your users login to a session via /login <token> and logout via /logout and supply the authentication method by yourself, then this is for you. You provide a way to authenticate users based on user id and login token and you may provider a number of handlers for various interactions during the login/logout process.

How to use it?

const makeAuthenticator = require("@yeldirium/telegraf-authentication-middleware");
const telegraf = require("telegraf");

// Very naive implementation of an authentication method.
const authenticator = async ({ userId, token }) => {
  const user = await database.lookupUser(userId);
  if (user.token === token) {
    return user;
  }
  return undefined;
};

const { middleware, guardMiddleware } = makeAuthenticator({ authenticator });

const bot = telegraf(token);

bot.use(middleware);

// The guardMiddleware terminates the request if no user is logged in.
bot.command("restricted", guardMiddleware, ctx => {
  console.log(ctx.user); // The currently logged in user.
});

You can start the authenticator with a map of authenticated users. This way you can store sessions in a database and retrieve them on startup:

const makeAuthenticator = require("@yeldirium/telegraf-authentication-middleware");
const telegraf = require("telegraf");

const authenticatedUsers = new Map();
(await database.findAuthenticatedUsers()).forEach(({ userId, userObject }) => {
  authenticatedUsers.set(userId, userObject);
});

// Very naive implementation of an authentication method.
const authenticator = async ({ userId, token }) => {
  // ...
};

const { middleware } = makeAuthenticator({ authenticator, authenticatedUsers });

And dump the users that currently authenticated to store them somewhere:

// ...
const { middleware, getAuthenticatedUsers } = makeAuthenticator({
  authenticator
});

console.log(getAuthenticatedUsers()); // Map of all currently authenticated users.

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