DonutBot/afk.js

const mineflayer = require("mineflayer");
const fs = require("fs");
const path = require("path");

function getRuntimeUsername() {
  const fromArg = process.argv[2];
  if (typeof fromArg === "string" && fromArg.trim()) return fromArg.trim();

  const fromEnv = process.env.BOT_USERNAME;
  if (typeof fromEnv === "string" && fromEnv.trim()) return fromEnv.trim();

  return "AFKBot";
}

function toSafeFilePart(value) {
  return String(value).replace(/[^a-zA-Z0-9_-]/g, "_");
}

const runtimeUsername = getRuntimeUsername();

// Configuration
const BOT_CONFIG = {
  host: "java.donutsmp.net",
  username: runtimeUsername,
  auth: "microsoft",
  version: "1.21.1",
};

const LOG_FILE = path.join(
  __dirname,
  `afk-${toSafeFilePart(runtimeUsername)}.log`,
);
const TELEPORT_DETECT_REGEX = /you teleported to\b/i;
const AFK_RETRY_DELAY_MS = 5000;
const AFK_MIN_NUMBER = 1;
const AFK_MAX_NUMBER = 50;

let hasDetectedTeleport = false;
let afkRetryTimer = null;

// Logging
function log(message) {
  const timestamp = new Date().toISOString();
  const logMessage = `[${timestamp}] ${message}`;
  console.log(logMessage);
  fs.appendFileSync(LOG_FILE, logMessage + "\n");
}

function getRandomIntInclusive(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function clearAfkRetryTimer() {
  if (afkRetryTimer) {
    clearTimeout(afkRetryTimer);
    afkRetryTimer = null;
  }
}

function scheduleAfkRetryCheck() {
  clearAfkRetryTimer();

  afkRetryTimer = setTimeout(() => {
    if (hasDetectedTeleport) return;

    const randomNumber = getRandomIntInclusive(AFK_MIN_NUMBER, AFK_MAX_NUMBER);
    const command = `/afk ${randomNumber}`;
    log(
      `No teleport detected after ${AFK_RETRY_DELAY_MS}ms; sending: ${command}`,
    );
    bot.chat(command);

    // Keep checking every delay window until teleport is detected.
    scheduleAfkRetryCheck();
  }, AFK_RETRY_DELAY_MS);
}

function toPlainText(value) {
  if (value == null) return "";
  if (typeof value === "string") return value;
  if (
    typeof value.toString === "function" &&
    value.toString !== Object.prototype.toString
  ) {
    const asString = value.toString();
    if (asString && asString !== "[object Object]") return asString;
  }

  if (Array.isArray(value)) {
    return value.map(toPlainText).join("");
  }

  if (typeof value === "object") {
    let text = "";
    if (typeof value.text === "string") text += value.text;
    if (typeof value.translate === "string") text += value.translate;
    if (Array.isArray(value.with)) text += value.with.map(toPlainText).join("");
    if (Array.isArray(value.extra))
      text += value.extra.map(toPlainText).join("");
    return text;
  }

  return String(value);
}

function logIfTeleport(source, text) {
  const normalized = String(text || "").trim();
  if (!normalized) return;
  if (!TELEPORT_DETECT_REGEX.test(normalized)) return;
  log(`Teleport detected from ${source}: ${normalized}`);

  if (!hasDetectedTeleport) {
    hasDetectedTeleport = true;
    clearAfkRetryTimer();
    log("Teleport confirmed; stopped AFK retry loop");
  }
}

// Create bot
const bot = mineflayer.createBot({
  host: BOT_CONFIG.host,
  username: BOT_CONFIG.username,
  auth: BOT_CONFIG.auth,
  version: BOT_CONFIG.version,
});

// Event handlers
bot.on("login", () => {
  log("Bot logged in");
  bot.setControlState("forward", false);
});

bot.on("spawn", () => {
  log("Bot spawned");
  hasDetectedTeleport = false;
  scheduleAfkRetryCheck();
});

bot.on("error", (err) => {
  log(`Error: ${err.message}`);
});

bot.on("kicked", (reason) => {
  log(`Kicked: ${reason}`);
});

bot.on("end", () => {
  clearAfkRetryTimer();
  log("Bot disconnected");
  process.exit(0);
});

bot.on("chat", (username, message) => {
  if (username === bot.username) return;
  log(`Chat [${username}]: ${message}`);
  logIfTeleport("chat", message);
});

bot.on("messagestr", (message, position) => {
  if (!message) return;

  if (position === "game_info") {
    log(`Hotbar: ${message}`);
  }

  logIfTeleport(`messagestr${position ? `:${position}` : ""}`, message);
});

bot.on("message", (jsonMsg, position) => {
  const text = toPlainText(jsonMsg);
  if (!text) return;

  if (position === "game_info") {
    log(`Hotbar(json): ${text}`);
  }

  logIfTeleport(`message${position ? `:${position}` : ""}`, text);
});

// Fallback packet hooks for title/actionbar channels on servers that do not
// emit teleport text through regular chat events.
bot._client.on("set_action_bar_text", (packet) => {
  const text = toPlainText(packet?.text);
  if (!text) return;
  log(`ActionBar: ${text}`);
  logIfTeleport("actionbar", text);
});

bot._client.on("set_title_text", (packet) => {
  const text = toPlainText(packet?.text);
  if (!text) return;
  log(`Title: ${text}`);
  logIfTeleport("title", text);
});

bot._client.on("set_subtitle_text", (packet) => {
  const text = toPlainText(packet?.text);
  if (!text) return;
  log(`Subtitle: ${text}`);
  logIfTeleport("subtitle", text);
});

// Graceful shutdown
process.on("SIGINT", () => {
  log("Shutdown signal received");
  clearAfkRetryTimer();
  bot.quit();
});

log("Starting AFK bot...");