AWS S3 session middleware for Telegraf

AWS S3 powered session middleware for Telegraf.

Prerequisites

1. You have made your AWS access and secret key available through a provided method, like storing them in the ~/.aws/credentials file or export them into environment variables
2. You need to install Node.js with a minimum version of 8.9.0

Installation

$ npm install telegraf-session-s3

Example

const Telegraf = require('telegraf');
const S3Session = require('telegraf-session-s3');

const bot = new Telegraf(process.env.BOT_TOKEN);

const s3Session = new S3Session({
    bucket: process.env.S3_STATES_BUCKET
});
bot.use(s3Session.middleware());

bot.on('text', (ctx) => {
  ctx.session.counter = ctx.session.counter || 0
  ctx.session.counter++
  console.log('Session', ctx.session)
})

bot.startPolling();

When you have stored the session key beforehand, you can access a session without having access to a context object. This is useful when you perform OAUTH or something similar, when a REDIRECT_URI is called on your bot server.

const s3Session = new S3Session({
    bucket: process.env.S3_STATES_BUCKET
});

// Retrieve session state by session key
s3Session.getSession(key)
  .then((session) => {
      console.log('Session state', session);
  });

// Save session state
s3Session.saveSession(key, session);

API

Options

• bucket: AWS S3 Bucket where session will be stored
• property: context property name (default: session)
• getSessionKey: session key resolver function (ctx) => any)

Default implementation of getSessionKey:

function getSessionKey(ctx) {
  if (!ctx.from || !ctx.chat) {
    return
  }
  return `${ctx.from.id}:${ctx.chat.id}`
}

Destroying a session

To destroy a session simply set it to null.

bot.on('text', (ctx) => {
  ctx.session = null
})

Acknowledgement

• telegraf-session-redis