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index.js
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index.js
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"use strict";
const botCommandDelm = "!kb";
const messageLimit = 2000;
require("dotenv").config();
const childProcess = require("child_process");
const Discord = require("discord.js");
const client = new Discord.Client();
// a dictionary with usernames and value boolean
// if a user doesn't exist then it would be false
let allowedUsers = {};
let allowAll = false;
// owners can make other users be allowed to run kontrolbot
// owners can only be modified by modifying .env and restarting kontrolbot
let owners = {};
if (process.env.OWNERS) {
process.env.OWNERS.split(",").forEach((name) => {
owners[name] = true;
allowedUsers[name] = true;
});
} else {
allowAll = true;
}
client.on("ready", () => {
console.log("Bot running!");
});
client.on("message", (message) => {
const trimmedMessage = message.content.trim();
if (trimmedMessage[0] === ">") {
if (!checkAllowed(message)) return;
doShellCommand(message.channel, trimmedMessage.slice(1, trimmedMessage.length));
} else if (trimmedMessage.startsWith(botCommandDelm)) {
if (!checkAllowed(message)) return;
const removedDelm = trimmedMessage
.slice(botCommandDelm.length, trimmedMessage.length)
.trim();
doBotCommand(message, removedDelm);
}
});
client.login(process.env.BOT_TOKEN);
let subProcess;
let smbInterval;
function doShellCommand(channel, shellCommand) {
if (subProcess != null) {
subProcess.stdin.write(shellCommand + "\n");
return;
}
subProcess = childProcess.spawn(shellCommand, {
shell: true,
windowsHide: true,
});
subProcess.command = shellCommand;
channel.send(`Running \`${subProcess.command}\`...`);
subProcess.stdout.on("data", (data) => {
queueMessage(data.toString());
});
subProcess.stderr.on("data", (data) => {
queueMessage(data.toString());
});
clearMessageBuffer();
smbInterval = setInterval(() => {
sendMessageBuffer(channel);
}, 500);
subProcess.on("exit", () => {
subProcess = null;
});
}
// bot commands begin with !kontrolbot
function doBotCommand(message, botCommand) {
const args = botCommand.split(/ +/g);
switch (args[0]) {
case "kill":
if (subProcess != null) {
message.channel.send(`Killed \`${subProcess.command}\`.`);
subProcess.kill();
clearMessageBuffer();
} else {
message.channel.send(`No process is running!`);
}
break;
case "allow":
if (!checkOwner(message)) break;
if (!allowedUsers[args[1]]) {
if (args[1] == "*") {
allowAll = true;
message.channel.send(`Made everyone allowed to use kontrol bot.`);
break;
}
message.channel.send(`Made ${args[1]} allowed to use kontrol bot.`);
allowedUsers[args[1]] = true;
} else {
message.channel.send(`${args[1]} was already allowed to use kontrol bot!`);
}
break;
case "disallow":
if (!checkOwner(message)) break;
if (args[1] == "*") {
message.channel.send(`Made all non owners disallowed from using kontrol bot.`);
resetAllowedUsers();
break;
}
if (allowAll) {
message.channel.send(
`Cannot disallow someone if everyone is allowed! Use * to disallow everyone.`
);
break;
}
if (allowedUsers[args[1]]) {
if (owners[args[1]]) {
message.channel.send(`Cannot disallow ${args[1]} because they are an owner!`);
break;
}
message.channel.send(`Made ${args[1]} disallowed from using kontrol bot.`);
allowedUsers[args[1]] = false;
} else {
message.channel.send(`${args[1]} was already disallowed from kontrol bot!`);
}
break;
default:
message.channel.send(`Invalid kontrol bot command: \`${botCommand}\``);
break;
}
}
function checkAllowed(message) {
if (!allowedUsers[message.author.tag] && !allowAll) {
message.channel.send(
`${message.author.tag} is not allowed to use kontrol bot! ` +
`Owners can allow by typing \`${botCommandDelm} allow ${message.author.tag}\``
);
return false;
}
return true;
}
function checkOwner(message) {
if (!owners[message.author.tag]) {
message.channel.send(
`${message.author.tag} is not an owner so they cannot allow or disallow other users from using kontrol bot!`
);
return false;
}
return true;
}
function resetAllowedUsers() {
allowAll = false;
Object.keys(owners).forEach((name) => {
allowedUsers[name] = true;
});
}
let messageBuffer = "";
function queueMessage(message) {
messageBuffer += message;
}
function sendMessageBuffer(channel) {
let messageToSend = messageBuffer;
if (messageBuffer.length > messageLimit) {
messageToSend = messageBuffer.slice(0, messageLimit);
let nextLineBreakI = messageToSend.lastIndexOf("\n");
if (nextLineBreakI !== -1) messageToSend = messageToSend.slice(0, nextLineBreakI + 1);
}
if (messageToSend.trim() === "") {
if (subProcess == null) clearMessageBuffer();
return;
}
const sanitizedMessage = messageToSend.replace(
/[A-Za-z\d]{22,24}\.[\w-]{4,6}\.[\w-]{25,27}/g,
""
);
channel.send(sanitizedMessage);
messageBuffer = messageBuffer.slice(messageToSend.length - 1, messageBuffer.length);
}
function clearMessageBuffer() {
clearInterval(smbInterval);
messageBuffer = "";
}