roleassign-bot.js

roleassign-bot.js

require("dotenv").config();
const Discord = require("discord.js");

const DISCORD_STUDENT_EXPERT_ROLE_ID =
  process.env.DISCORD_STUDENT_EXPERT_ROLE_ID;
const DISCORD_STUDENT_LEADER_ROLE_ID =
  process.env.DISCORD_STUDENT_LEADER_ROLE_ID;

if (
  !process.env.DISCORD_BOT_TOKEN ||
  !DISCORD_STUDENT_EXPERT_ROLE_ID ||
  !DISCORD_STUDENT_LEADER_ROLE_ID
) {
  throw new Error("Mising critical env vars, aborting server start.");
}

const bot = new Discord.Client();

const handleMessage = async (message) => {
  // ignore non-text messages
  if (message.channel.type != "text") return;

  const isHuman = !message.author.bot;

  // Listen for bot messages
  if (!isHuman && message.content.match(/^!!assign/)) {
    const parts = message.content.split(/\s/);

    console.log({ request: message.content });

    const userId = parts[1];
    
    const eligibleRoles = parts[2].split("|");
    const rolesToAssign = [];
    eligibleRoles.forEach((r) => {
      if (r === "Postman-Student-Expert") {
        rolesToAssign.push(DISCORD_STUDENT_EXPERT_ROLE_ID);
      } else if (r === "Postman-Student-Leader") {
        rolesToAssign.push(DISCORD_STUDENT_LEADER_ROLE_ID);
      } else {
        console.warn(`Role with name ${r} not found`);
      }
    });

    // fetch user by id
    let user;
    try {
      user = await message.guild.members.fetch(userId);
    } catch (e) {
      // user not found - abort silently
      console.error(`User with ID: ${userId} not found.`);
      return;
    }

    // message user
    if (rolesToAssign.length) {
      user.roles.add(rolesToAssign);
      const roleLen = rolesToAssign.length;

      const isPlural = roleLen > 1;

      const congratsMsg = `🎉 Congratulations! You've been granted ${
        isPlural ? roleLen + " new roles" : "a new role"
      } in the XYZ community server. Click your name from the member list in the server to see!`;
      user.send(congratsMsg);
    } else {
      user.send(
        `Uh oh, something went wrong with our server when attempting to assign your role.`
      );
    }
  }
};

// add message listener
bot.on("message", handleMessage);

try {
  bot.login(process.env.DISCORD_BOT_TOKEN);
  console.error("Bot started. Listening for requests...");
} catch (e) {
  console.error("Error: Bot login failed. ", e);
}