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app.js
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const express = require("express");
const bodyParser = require("body-parser");
const sqlite3 = require("sqlite3").verbose();
const axios = require("axios");
const querystring = require("querystring");
const dotenv = require("dotenv").config();
const session = require("express-session");
const app = express();
const port = 3000;
// Environment variables
const CLIENT_ID = process.env.CLIENT_ID;
const CLIENT_SECRET = process.env.CLIENT_SECRET;
const REDIRECT_URI = process.env.REDIRECT_URI;
const LOGIN_REDIRECT_URI = process.env.LOGIN_REDIRECT_URI;
const BOT_TOKEN = process.env.BOT_TOKEN;
const HCAPTCHA_SECRET = process.env.HCAPTCHA_SECRET;
const SESSION_SECRET = process.env.SESSION_SECRET;
const ADMIN_USER_ID = process.env.ADMIN_USER_ID;
// Initialize file-based SQLite database
const db = new sqlite3.Database("./urls.db");
db.serialize(() => {
db.run(`CREATE TABLE IF NOT EXISTS users (
id INTEGER PRIMARY KEY AUTOINCREMENT,
email TEXT UNIQUE,
discord_id TEXT UNIQUE,
invite_limit INTEGER DEFAULT 5
)`);
db.run(`CREATE TABLE IF NOT EXISTS urls (
id INTEGER PRIMARY KEY AUTOINCREMENT,
custom_url TEXT UNIQUE,
discord_invite TEXT,
user_id INTEGER,
FOREIGN KEY(user_id) REFERENCES users(id)
)`);
});
app.use(bodyParser.urlencoded({ extended: true }));
// Session configuration
app.use(
session({
secret: SESSION_SECRET,
resave: false,
saveUninitialized: true,
cookie: { secure: false }, // Note: Set to true if using HTTPS
})
);
// Home page - login with Discord
app.get("/", (req, res) => {
if (req.session.userId) {
return res.redirect("/manage");
}
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100vh;
background-color: #121212;
color: #fff;
text-align: center;
padding: 0 20px;
}
a {
color: #007bff;
text-decoration: none;
font-size: 20px;
background: #1e1e1e;
padding: 10px 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
margin-top: 20px;
}
a:hover {
text-decoration: underline;
}
</style>
</head>
<body>
<h1>Welcome to the Discord Invite Link Security Service</h1>
<p>Our service helps you create and manage secure custom invite links for your Discord server.</p>
<p>To get started, please log in with your Discord account.</p>
<a href="/login">Login with Discord</a>
</body>
</html>
`);
});
// Start Discord OAuth2 authentication
app.get("/login", (req, res) => {
const authorizeUrl = `https://discord.com/api/oauth2/authorize?client_id=${CLIENT_ID}&redirect_uri=${encodeURIComponent(
LOGIN_REDIRECT_URI
)}&response_type=code&scope=identify`;
res.redirect(authorizeUrl);
});
// Handle Discord OAuth2 callback for login
app.get("/callback/login", (req, res) => {
const code = req.query.code;
axios
.post(
"https://discord.com/api/oauth2/token",
querystring.stringify({
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
grant_type: "authorization_code",
code: code,
redirect_uri: LOGIN_REDIRECT_URI,
}),
{
headers: {
"Content-Type": "application/x-www-form-urlencoded",
},
}
)
.then((response) => {
const accessToken = response.data.access_token;
// Get Discord user info
return axios
.get("https://discord.com/api/users/@me", {
headers: {
Authorization: `Bearer ${accessToken}`,
},
})
.then((userResponse) => {
const discordId = userResponse.data.id;
const email = userResponse.data.email;
// Save user info in the database
db.run(
`INSERT OR IGNORE INTO users (discord_id, email) VALUES (?, ?)`,
[discordId, email],
function (err) {
if (err) {
console.error(err);
return res.send("Error occurred");
}
req.session.userId = discordId;
// Redirect to manage URL form
res.redirect("/manage");
}
);
});
})
.catch((err) => {
console.error(err);
res.send("Error during OAuth2 process.");
});
});
// URL creation form
app.get("/create", (req, res) => {
if (!req.session.userId) {
return res.redirect("/");
}
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
form {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}
input[type="text"] {
width: 100%;
padding: 10px;
margin-bottom: 10px;
border: 1px solid #333;
border-radius: 4px;
background-color: #2b2b2b;
color: #fff;
}
input[type="submit"] {
background: #007bff;
color: #fff;
padding: 10px;
border: none;
border-radius: 4px;
cursor: pointer;
}
input[type="submit"]:hover {
background: #0056b3;
}
label {
display: block;
margin-bottom: 5px;
}
</style>
<script src="https://hcaptcha.com/1/api.js" async defer></script>
</head>
<body>
<form action="/create" method="post">
<label>Custom URL:</label>
<input type="text" name="custom_url" required>
<label>Discord Invite Link:</label>
<input type="text" name="discord_invite" required>
<div class="h-captcha" data-sitekey="c9b5032f-0b16-4ec4-a6e8-6798483099b6"></div>
<input type="submit" value="Create">
</form>
</body>
</html>
`);
});
// URL creation
app.post("/create", (req, res) => {
if (!req.session.userId) {
return res.redirect("/");
}
const customUrl = req.body.custom_url;
const discordInvite = req.body.discord_invite.replace(/\s+/g, "");
const userId = req.session.userId;
const hcaptchaResponse = req.body["h-captcha-response"];
// Validate hCaptcha response
axios
.post(
`https://hcaptcha.com/siteverify`,
querystring.stringify({
secret: HCAPTCHA_SECRET,
response: hcaptchaResponse,
})
)
.then((hcaptchaRes) => {
if (!hcaptchaRes.data.success) {
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">hCaptcha verification failed. Please try again.</div>
</body>
</html>
`);
}
// Validate URL format
const urlPattern = /^[a-zA-Z0-9-_]+$/;
if (!urlPattern.test(customUrl)) {
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">Invalid URL. Only alphanumeric characters, dashes, and underscores are allowed.</div>
</body>
</html>
`);
}
// Validate Discord invite link (e.g., https://discord.gg/abc123)
const discordPattern = /^https:\/\/discord\.gg\/[a-zA-Z0-9]+$/;
if (!discordPattern.test(discordInvite)) {
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">Invalid Discord invite link.</div>
</body>
</html>
`);
}
// Check the number of existing invite links for the user
db.get(
`SELECT invite_limit FROM users WHERE discord_id = ?`,
[userId],
(err, user) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
if (!user) {
console.error("User not found");
return res.send("Error occurred: User not found");
}
db.get(
`SELECT COUNT(*) as count FROM urls WHERE user_id = ?`,
[userId],
(err, row) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
if (row.count >= user.invite_limit) {
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">You have reached your invite limit. Please contact the admin to increase your limit.</div>
</body>
</html>
`);
}
const stmt = db.prepare(
`INSERT INTO urls (custom_url, discord_invite, user_id) VALUES (?, ?, ?)`
);
stmt.run(
customUrl,
discordInvite,
userId,
function (err) {
if (err) {
console.error(err);
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message">This custom URL already exists. Please choose another one.</div>
</body>
</html>
`);
}
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
a {
color: #007bff;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
</style>
</head>
<body>
URL created: <a href="/invite/${customUrl}">/invite/${customUrl}</a>
</body>
</html>
`);
}
);
stmt.finalize();
}
);
}
);
})
.catch((err) => {
console.error(err);
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">hCaptcha verification failed. Please try again.</div>
</body>
</html>
`);
});
});
// Manage URLs page
app.get("/manage", (req, res) => {
if (!req.session.userId) {
return res.redirect("/");
}
db.get(
`SELECT invite_limit FROM users WHERE discord_id = ?`,
[req.session.userId],
(err, user) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
if (!user) {
console.error("User not found");
return res.send("Error occurred: User not found");
}
db.all(
`SELECT custom_url, discord_invite FROM urls WHERE user_id = ?`,
[req.session.userId],
(err, rows) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
const links = rows
.map(
(row) => `
<li>
<a href="/invite/${row.custom_url}">${row.custom_url}</a> - ${row.discord_invite}
<form action="/delete" method="post" style="display:inline;">
<input type="hidden" name="custom_url" value="${row.custom_url}">
<input type="submit" value="Delete">
</form>
</li>`
)
.join("");
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
flex-direction: column;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
ul {
list-style: none;
padding: 0;
}
li {
margin: 10px 0;
}
a {
color: #007bff;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
form {
display: inline;
}
input[type="submit"] {
background: #ff4d4d;
color: #fff;
padding: 5px 10px;
border: none;
border-radius: 4px;
cursor: pointer;
}
input[type="submit"]:hover {
background: #ff1a1a;
}
.logout {
margin-top: 20px;
background: #007bff;
color: #fff;
padding: 10px;
border: none;
border-radius: 4px;
cursor: pointer;
text-decoration: none;
}
.logout:hover {
background: #0056b3;
}
</style>
</head>
<body>
<h1>Your Invite Links</h1>
<p>Invite Limit: ${user.invite_limit}</p>
<ul>${links}</ul>
<a href="/create">Create new invite link</a>
<form action="/logout" method="post">
<input type="submit" value="Logout" class="logout">
</form>
</body>
</html>
`);
}
);
}
);
});
// Delete URL
app.post("/delete", (req, res) => {
if (!req.session.userId) {
return res.redirect("/");
}
const customUrl = req.body.custom_url;
db.run(
`DELETE FROM urls WHERE custom_url = ? AND user_id = ?`,
[customUrl, req.session.userId],
(err) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
res.redirect("/manage");
}
);
});
// Logout route
app.post("/logout", (req, res) => {
req.session.destroy((err) => {
if (err) {
return res.send("Error occurred while logging out");
}
res.redirect("/");
});
});
// Admin page to increase invite limit and search user by ID
// Admin page to increase and decrease invite limit and search user by ID
app.get("/admin", (req, res) => {
if (req.session.userId !== ADMIN_USER_ID) {
return res.redirect("/");
}
const searchUserId = req.query.user_id || "";
let query = `SELECT id, discord_id, email, invite_limit FROM users`;
let params = [];
if (searchUserId) {
query += ` WHERE discord_id LIKE ?`;
params.push(`%${searchUserId}%`);
}
db.all(query, params, (err, rows) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
const users = rows
.map(
(row) => `
<li>
ID: ${row.discord_id} - Email: ${row.email} - Invite Limit: ${row.invite_limit}
<form action="/admin/increase" method="post" style="display:inline;">
<input type="hidden" name="user_id" value="${row.id}">
<input type="submit" value="Increase Limit">
</form>
<form action="/admin/decrease" method="post" style="display:inline;">
<input type="hidden" name="user_id" value="${row.id}">
<input type="submit" value="Decrease Limit">
</form>
</li>`
)
.join("");
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
flex-direction: column;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
ul {
list-style: none;
padding: 0;
}
li {
margin: 10px 0;
}
form {
display: inline;
}
input[type="submit"] {
background: #007bff;
color: #fff;
padding: 5px 10px;
border: none;
border-radius: 4px;
cursor: pointer;
}
input[type="submit"]:hover {
background: #0056b3;
}
.logout {
margin-top: 20px;
background: #007bff;
color: #fff;
padding: 10px;
border: none;
border-radius: 4px;
cursor: pointer;
text-decoration: none;
}
.logout:hover {
background: #0056b3;
}
.search {
margin-bottom: 20px;
}
</style>
</head>
<body>
<h1>Admin Panel</h1>
<p>Use this panel to manage users and adjust their invite limits. You can also search for users by their Discord ID.</p>
<form action="/admin" method="get" class="search">
<label for="user_id">Search by User ID:</label>
<input type="text" name="user_id" id="user_id" value="${searchUserId}">
<input type="submit" value="Search">
</form>
<ul>${users}</ul>
<form action="/logout" method="post">
<input type="submit" value="Logout" class="logout">
</form>
</body>
</html>
`);
});
});
// Increase invite limit
app.post("/admin/increase", (req, res) => {
if (req.session.userId !== ADMIN_USER_ID) {
return res.redirect("/");
}
const userId = req.body.user_id;
db.run(
`UPDATE users SET invite_limit = invite_limit + 5 WHERE id = ?`,
[userId],
function (err) {
if (err) {
console.error(err);
return res.send("Error occurred");
}
res.redirect("/admin");
}
);
});
// Decrease invite limit
app.post("/admin/decrease", (req, res) => {
if (req.session.userId !== ADMIN_USER_ID) {
return res.redirect("/");
}
const userId = req.body.user_id;
db.get(
`SELECT invite_limit FROM users WHERE id = ?`,
[userId],
(err, row) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
if (row.invite_limit > 0) {
db.run(
`UPDATE users SET invite_limit = invite_limit - 5 WHERE id = ?`,
[userId],
function (err) {
if (err) {
console.error(err);
return res.send("Error occurred");
}
res.redirect("/admin");
}
);
} else {
res.send("Cannot decrease invite limit below 0");
}
}
);
});
// Start Discord OAuth2 authentication for joining
app.get("/invite/:custom_url", (req, res) => {
const customUrl = req.params.custom_url;
db.get(
`SELECT discord_invite FROM urls WHERE custom_url = ?`,
[customUrl],
(err, row) => {
if (err) {
console.error(err);
return res.send("Error occurred");
}
if (row) {
const state = customUrl;
const authorizeUrl = `https://discord.com/api/oauth2/authorize?client_id=${CLIENT_ID}&redirect_uri=${encodeURIComponent(
REDIRECT_URI
)}&response_type=code&scope=identify%20guilds.join&state=${state}`;
res.redirect(authorizeUrl);
} else {
res.status(404).send("URL not found");
}
}
);
});
// Handle Discord OAuth2 callback for joining
app.get("/callback/join", (req, res) => {
const code = req.query.code;
const state = req.query.state;
axios
.post(
"https://discord.com/api/oauth2/token",
querystring.stringify({
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
grant_type: "authorization_code",
code: code,
redirect_uri: REDIRECT_URI,
}),
{
headers: {
"Content-Type": "application/x-www-form-urlencoded",
},
}
)
.then((response) => {
const accessToken = response.data.access_token;
// Get Discord user info
return axios
.get("https://discord.com/api/users/@me", {
headers: {
Authorization: `Bearer ${accessToken}`,
},
})
.then((userResponse) => {
const userId = userResponse.data.id;
// Store user info and state in session or database
// Here we just pass it to the next step for simplicity
res.redirect(
`/verify/${state}?user_id=${userId}&access_token=${accessToken}`
);
});
})
.catch((err) => {
console.error(err);
res.send("Error during OAuth2 process.");
});
});
// Verify hCaptcha and add user to server
app.get("/verify/:custom_url", (req, res) => {
const customUrl = req.params.custom_url;
const userId = req.query.user_id;
const accessToken = req.query.access_token;
res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
form {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}
input[type="submit"] {
background: #007bff;
color: #fff;
padding: 10px;
border: none;
border-radius: 4px;
cursor: pointer;
}
input[type="submit"]:hover {
background: #0056b3;
}
</style>
<script src="https://hcaptcha.com/1/api.js" async defer></script>
</head>
<body>
<form action="/verify/${customUrl}" method="post">
<div class="h-captcha" data-sitekey="c9b5032f-0b16-4ec4-a6e8-6798483099b6"></div>
<input type="hidden" name="user_id" value="${userId}">
<input type="hidden" name="access_token" value="${accessToken}">
<input type="submit" value="Verify and Join">
</form>
</body>
</html>
`);
});
app.post("/verify/:custom_url", (req, res) => {
const customUrl = req.params.custom_url;
const hcaptchaResponse = req.body["h-captcha-response"];
const userId = req.body.user_id;
const accessToken = req.body.access_token;
// Verify hCaptcha response
axios
.post(
`https://hcaptcha.com/siteverify`,
querystring.stringify({
secret: HCAPTCHA_SECRET,
response: hcaptchaResponse,
})
)
.then((captchaRes) => {
if (captchaRes.data.success) {
db.get(
`SELECT discord_invite FROM urls WHERE custom_url = ?`,
[customUrl],
(err, row) => {
if (err) {
console.error(err);
return res.send(`
<html>
<head>
<style>
body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
background-color: #121212;
color: #fff;
}
.message {
background: #1e1e1e;
padding: 20px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
text-align: center;
}
.error {
color: #ff4d4d;
}
</style>
</head>
<body>
<div class="message error">An error occurred</div>
</body>
</html>