sshChatBridge/bot.js

const Discord = require('discord.js');
const Hyperswarm = require('hyperswarm');
const crypto = require('hypercore-crypto');
const { Client, GatewayIntentBits, Partials, messageLink } = require("discord.js");
const goodbye = require('graceful-goodbye')
require('dotenv').config()

const client = new Client({
    'intents': [
      GatewayIntentBits.DirectMessages,
      GatewayIntentBits.MessageContent,
      GatewayIntentBits.GuildMessages,
      GatewayIntentBits.Guilds,
      GatewayIntentBits.GuildBans,
      GatewayIntentBits.GuildMessages
    ],
    'partials': [Partials.Channel, Partials.Message, Partials.MessageContent]
  });

const topicMap = new Map();
  goodbye(() => {
    for(let [channel_id, topic_obj] of topicMap)
    {
        topic_obj.swarm.destroy();
    }
    })

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

client.on('messageCreate', msg => {

  if (msg.content.startsWith("!") && !msg.author.bot){
    const args = msg.content.split(" ");
    const cmd = args.shift().slice(1);

    if (cmd === "current-topic") {
        if(topicMap.has(msg.channel.id))
        {
            let topic_obj = topicMap.get(msg.channel.id);
            msg.reply(`The current topic for this channel is: ${topic_obj.topic.toString('hex')}`);
            }
            else{
                msg.reply(`No topic is assigned for this channel`);
            }
        }
    
        if (cmd === "join-topic") {
            if (!args[0]) {
                msg.reply("Please provide a new topic in hexadecimal format");
                return;
            }
            let topic = crypto.randomBytes(32);
            let channel_id = args[1];
            if(!channel_id)
            {
                msg.reply("Please provide a channel_id to send this topic's messages")
                return;
            }
            //Check if the given channel_id exists or not.
            if(!client.channels.cache.get(channel_id))
            {
                msg.reply("The provided channel id does not exist.");
                return;
            }
            let swarm;
            let conns =[];
            if(topicMap.has(channel_id))
            {
                topic_obj = topicMap.get(channel_id);
                swarm = topic_obj.swarm;
                conns = topic_obj.conns;
            }
            else
            {
                swarm = new Hyperswarm();
                topicMap.set(channel_id, {topic: topic, swarm: swarm, conns: conns});
                // Join the new topic
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                swarm.on('connection', (conn, info) => {
                    console.log(`Connected to a peer for topic ${topic.toString('hex')}`);
                    conns.push(conn);
                    conn.on('data', data => {
                        // Send the message from the topic to the Discord channel
                        client.channels.fetch(channel_id).then(channel=>channel.send(data.toString()))
                    });
                });
                client.channels.fetch(channel_id).then(channel => {
                    msg.reply(`Successfully joined topic and sending messages to ${channel}`);

                });

            }
        }
    
        if (cmd === "set-topic") {
            let channel_id = msg.channel.id;
            //Check if the given channel_id exists or not.
            if(!client.channels.cache.get(channel_id))
            {
                msg.reply("The provided channel id does not exist.");
                return;
            }
            let topic = crypto.randomBytes(32);
            let swarm;
            let conns =[];
            if(topicMap.has(channel_id))
            {
                topic_obj = topicMap.get(channel_id);
                topic_obj.swarm.leave(topic_obj.topic);
                topic_obj.topic = topic;
                swarm = topic_obj.swarm;
                conns = topic_obj.conns;
            }
            else{
                swarm = new Hyperswarm();
                conns = [];
                topicMap.set(channel_id, {topic: topic, swarm: swarm, conns: conns});
                // Join the new topic
                swarm.join(topic, {
                    lookup: true,
                    announce: true,
                    timeout: 30000
                });
                swarm.on('connection', (conn, info) => {
                    console.log(`Connected to a peer for topic ${topic.toString('hex')}`);
                    conns.push(conn);
                    conn.on('data', data => {
                        // Send the message from the topic to the Discord channel
                        client.channels.fetch(channel_id).then(channel=>channel.send(data.toString()))
                    });
                });
            }
            msg.reply(`Successfully set topic ${topic.toString('hex')} for channel ${channel_id}`);
        }

        if (cmd === "leave-topic") {
            let channel_id = msg.channel.id;
            let topic_obj = topicMap.get(channel_id);
            if (topic_obj) {
              topic_obj.swarm.leave(topic_obj.topic);
              topicMap.delete(channel_id);
              return msg.reply(`Successfully left topic ${topic_obj.topic.toString('hex')} for channel ${channel_id}`);
            } else {
              return msg.reply(`No topic is assigned for this channel`);
            }
          }

      }
      // Check if message is sent in a channel with a topic assigned and send it to the topic
        if(topicMap.has(msg.channel.id) && !msg.author.bot){
            let topic_obj = topicMap.get(msg.channel.id);
            let conns = topic_obj.conns;
            for (const conn of conns) {
                conn.write(`${msg.author.username}(Discord): ${msg.content}`);
            }
        }
    });
    
    client.login(process.env.TOKEN);