eval-server/vm.js

const { parentPort } = require('worker_threads')
const { VM } = require('vm2')
const randomstring = require('randomstring')
const ChatMessage = require('prismarine-chat')('1.20.1')
const mc = require('minecraft-protocol')
const moment = require('moment-timezone')
const crypto = require('crypto')
const nbt = require('prismarine-nbt')
const util = require('util')
const { stylize } = require('./colors')

const BRIDGE_PREFIX = 'function:'

let proxy

let vm

const handler = {
    get (target, prop) {
        if (!target[prop]) throw new Error(`Function "${prop}" not available`)

        return (...args) => target[prop](...args)
    }
}

let functions

parentPort.on('message', (msg) => {
    switch (msg.type) {
        case 'setFunctions':
            const parsed = JSON.parse(msg.jsonArray)

            functions = {}

            for (const eachFuntion of parsed) {
                functions[eachFuntion] = (...args) => {
                    parentPort.postMessage({ type: 'socketEmit', data: [BRIDGE_PREFIX + eachFuntion, ...args] })

                    // how do i make thjis work
                    // return new Promise((resolve) => {
                    //     parentPort.postMessage({ type: 'socketOnce', data: [`functionOutput:${eachFuntion}`, (message, parseJSON) => {
                    //         if (parseJSON) resolve(JSON.parse(message))
                    //         else resolve(message)
                    //     }]})
                    // })
                }
            }

            proxy = new Proxy(functions, handler)

            vm = new VM({
                timeout: 100,
                sandbox: {
                    get bridge () { return proxy },
                    randomstring,
                    ChatMessage,
                    mc,
                    moment,
                    crypto,
                    nbt
                }
            })

            break
        case 'runCode':
            try {
                const output = vm.run(msg.code)

                parentPort.postMessage({ type: 'codeOutput', output: util.inspect(output, { stylize }), error: false })
            } catch (e) {
                parentPort.postMessage({ type: 'codeOutput', output: e.toString(), error: true })
            }

            break
    }
})