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import "dotenv/config";
import express, { Request, Response } from "express";
import cookieParser from "cookie-parser";
import {
initDatabase,
generateToken,
User,
Config,
handleFile,
} from "fosscord-server/src/util";
import path from "path";
import fetch from "node-fetch";
// apparently dirname doesn't exist in modules, nice
/* https://stackoverflow.com/a/62892482 */
import { fileURLToPath } from "url";
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const app = express();
app.use(cookieParser());
const port = process.env.PORT;
// ip -> unix epoch that requests will be accepted again
const rateLimits: { [ip: string]: number } = {};
const allowRequestsEveryMs = 0.5 * 1000; // every half second
const allowedRequestsPerSecond = 50;
let requestsThisSecond = 0;
setInterval(() => {
requestsThisSecond = 0;
}, 1000);
const toDataURL = async (url: string) => {
const response = await fetch(url);
const blob = await response.blob();
const buffer = Buffer.from(await blob.text());
return `data:${blob.type};base64,${buffer.toString("base64")}`;
};
class Discord {
static getAccessToken = async (req: Request, res: Response) => {
const { code } = req.query;
const body = new URLSearchParams(
Object.entries({
client_id: process.env.DISCORD_CLIENT_ID as string,
client_secret: process.env.DISCORD_SECRET as string,
redirect_uri: process.env.DISCORD_REDIRECT as string,
code: code as string,
grant_type: "authorization_code",
}),
).toString();
const resp = await fetch("https://discord.com/api/oauth2/token", {
method: "POST",
headers: {
"Content-Type": "application/x-www-form-urlencoded",
},
body: body,
});
const json = (await resp.json()) as any;
if (json.error) return null;
return {
access_token: json.access_token,
token_type: json.token_type,
expires_in: json.expires_in,
refresh_token: json.refresh_token,
scope: json.scope,
};
};
static getUserDetails = async (token: string) => {
const resp = await fetch("https://discord.com/api/users/@me", {
headers: {
Authorization: `Bearer ${token}`,
},
});
const json = (await resp.json()) as any;
if (!json.username || !json.email) return null; // eh, deal with bad code later
return {
id: json.id,
email: json.email,
username: json.username,
avatar_url: json.avatar
? `https://cdn.discordapp.com/avatars/${json.id}/${json.avatar}?size=2048`
: null,
};
};
}
const handlers: { [key: string]: any } = {
discord: Discord,
};
app.get("/oauth/:type", async (req, res) => {
requestsThisSecond++;
if (requestsThisSecond > allowedRequestsPerSecond)
return res.sendStatus(429);
const ip =
(req.headers["x-forwarded-for"] as string) ||
(req.socket.remoteAddress as string);
console.log(`${ip}`);
if (!rateLimits[ip]) {
rateLimits[ip] = Date.now() + allowRequestsEveryMs;
} else if (rateLimits[ip] > Date.now()) {
rateLimits[ip] += allowRequestsEveryMs;
console.log(
`${new Date()} : user ${ip} was timed out for ${
(rateLimits[ip] - Date.now()) / 1000
}s`,
);
return res.sendStatus(429);
} else {
delete rateLimits[ip];
}
const { type } = req.params;
const handler = handlers[type];
if (!type || !handler) return res.sendStatus(400);
const data = await handler.getAccessToken(req, res);
if (!data) return res.sendStatus(500);
const details = await handler.getUserDetails(data.access_token);
if (!details) return res.sendStatus(500);
let user = await User.findOne({ where: { email: details.email } });
if (!user) {
user = await User.register({
email: details.email,
username: details.username,
req,
});
if (details.avatar_url) {
try {
const avatar = await handleFile(
`/avatars/${user.id}`,
(await toDataURL(details.avatar_url)) as string,
);
user.avatar = avatar;
await user.save();
} catch (e) {
console.error(e);
}
}
}
const token = await generateToken(user.id);
res.cookie("token", token);
res.sendFile(path.join(__dirname, "../public/login.html"));
});
app.use(express.static("public", { extensions: ["html"] }));
(async () => {
await initDatabase();
await Config.init();
app.listen(port, () => {
console.log(`Listening on port ${port}`);
});
})();
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