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const express = require("express");
const mysql = require("mysql");
const bodyParser = require("body-parser");
const https = require("https");
const fs = require("fs");
const api = express();
const rate_limiting = new Set();
const tmwa = {
status: "OfflineTemporarily",
num_online: 0,
timeout: null,
poll: () => {
fs.readFile("./online.txt", "utf8", (err, data) => {
const lines = data.split("\n");
if (err || lines.length < 2) {
console.error("encountered an error while retrieving online.txt", err);
tmwa.timeout = setTimeout(tmwa.poll, 30000); // <= it failed, so check again later
return;
}
const last_online = Date.parse(lines[0].match(/\((.+)\)/)[1] + ` ${process.env.npm_package_config_timezone}`);
if (Date.now() - last_online < 30000) {
const num = lines[lines.length - 2].match(/([0-9]+) users are online./);
tmwa.status = "Online";
tmwa.num_online = num ? num[1] : 0;
} else {
tmwa.status = "OfflineTemporarily";
tmwa.num_online = 0;
}
tmwa.timeout = setTimeout(tmwa.poll, 2000);
});
}
};
const checkRateLimiting = (req, res, next) => {
if (rate_limiting.has(req.ip)) {
res.status(429).json({
status: "error",
error: "too many requests"
});
} else {
next();
}
return;
};
const checkCaptcha = (req, res, next) => {
const token = String(req.get("X-CAPTCHA-TOKEN"));
if (!token.match(/^[a-zA-Z0-9-_]{8,}$/)) {
res.status(403).json({
status: "error",
error: "no token sent"
});
console.info("a request with an empty token was received", req.ip);
rate_limiting.add(req.ip);
setTimeout(() => rate_limiting.delete(req.ip), 300000);
return;
}
https.get(`https://www.google.com/recaptcha/api/siteverify?secret=${process.env.npm_package_config_recaptcha_secret}&response=${token}`, re => {
re.setEncoding("utf8");
re.on("data", response => {
const data = JSON.parse(response);
if (!data.success) {
console.error(`recaptcha returned an error: ${response}`);
res.status(403).json({
status: "error",
error: "captcha validation failed"
});
console.info("a request failed to validate", req.ip);
rate_limiting.add(req.ip);
setTimeout(() => rate_limiting.delete(req.ip), 300000);
return;
}
next(); // challenge passed, so process the request
});
}).on("error", error => {
console.error(error);
res.status(403).json({
status: "error",
error: "recaptcha couldn't be reached"
});
console.warn("reCaptcha couldn't be reached");
return;
})
};
api.get("/api/tmwa", (req, res) => {
res.append("Access-Control-Allow-Origin", "*"); // CORS ready
res.status(200).json({
"@context": "http://schema.org",
"@type": "GameServer",
name: process.env.npm_package_config_tmwa_name,
url: process.env.npm_package_config_tmwa_url,
playersOnline: tmwa.num_online,
serverStatus: tmwa.status,
});
});
api.use(checkRateLimiting);
api.use(checkCaptcha);
api.use(bodyParser.json());
api.post("/api/account", (req, res) => {
if (!req.body || !Reflect.has(req.body, "username") ||
!Reflect.has(req.body, "password") || !Reflect.has(req.body, "email") ||
!req.body.username.match(/^[a-zA-Z0-9]{4,23}$/) ||
!req.body.password.match(/^[a-zA-Z0-9]{4,23}$/) ||
!req.body.email.match(/^$|^(?:[a-zA-Z0-9.$&+=_~-]{1,34}@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,35}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,34}[a-zA-Z0-9])?){0,9})$/) ||
req.body.email.length >= 40)
{
res.status(400).json({
status: "error",
error: "malformed request"
});
console.info("a malformed request was received", req.ip, req.body);
rate_limiting.add(req.ip);
setTimeout(() => rate_limiting.delete(req.ip), 300000);
return;
}
const account = {
username: req.body.username,
password: req.body.password,
email: req.body.email || "a@a.com"
};
const db = mysql.createConnection({
host : process.env.npm_package_config_sql_host,
user : process.env.npm_package_config_sql_user,
password : process.env.npm_package_config_sql_password,
database : process.env.npm_package_config_sql_database
});
db.connect(err => {
if (err) {
res.status(500).json({
status: "error",
error: "couldn't reach the database"
});
console.warn("a connection with the database couldn't be established");
return;
}
db.query({sql: `INSERT INTO ${process.env.npm_package_config_sql_table} (USERNAME, PASSWORD, EMAIL, GENDER) VALUES ("${account.username}", "${account.password}", "${account.email}", "N")`}, (err, rows, fields) => {
if (err) {
if (err.code === "ER_DUP_ENTRY") {
res.status(409).json({
status: "error",
error: "already exists"
});
console.info("a request to create an already-existent account was received", req.ip, account.username);
rate_limiting.add(req.ip);
setTimeout(() => rate_limiting.delete(req.ip), 2000);
} else {
res.status(500).json({
status: "error",
error: "couldn't add the user"
});
console.error("an unexpected sql error occured", err);
}
} else {
res.status(201).json({
status: "success"
});
console.info(`an account was created: ${account.username}`);
rate_limiting.add(req.ip);
setTimeout(() => rate_limiting.delete(req.ip), 300000);
}
db.end();
});
});
});
api.use((req, res, next) => {
res.status(404).json({
status: "error",
error: "unknown endpoint"
});
console.info("a request for an unknown endpoint was received", req.ip, req.originalUrl);
});
if (process.env.npm_package_config_port === undefined) {
console.error("Please run this package with `npm start`");
process.exit(1);
}
api.set("trust proxy", "loopback"); // only allow localhost to communicate with the API
api.disable("x-powered-by"); // we don't need this header
api.listen(process.env.npm_package_config_port, () => console.info(`Listening on port ${process.env.npm_package_config_port}`));
tmwa.poll();
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