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/*
Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Spacebar and Spacebar Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { checkToken, Rights, Session, User, UserTokenData } from "@spacebar/util";
import { NextFunction, Request, Response } from "express";
import { HTTPError } from "lambert-server";
export const NO_AUTHORIZATION_ROUTES = [
// Authentication routes
"POST /auth/login",
"POST /auth/register",
"GET /auth/location-metadata",
"POST /auth/mfa/",
"POST /auth/verify",
"POST /auth/forgot",
"POST /auth/reset",
"POST /auth/fingerprint",
"GET /invites/",
// Routes with a seperate auth system
/^(POST|HEAD|GET|PATCH|DELETE) \/webhooks\/\d+\/\w+\/?/, // no token requires auth
/^POST \/interactions\/\d+\/[A-Za-z0-9_-]+\/callback/,
// Public information endpoints
"GET /ping",
"GET /gateway",
"GET /experiments",
"GET /updates",
"GET /download",
"GET /scheduled-maintenances/upcoming.json",
// Public kubernetes integration
"GET /-/readyz",
"GET /-/healthz",
// Client analytics
"POST /science",
"POST /track",
// Public policy pages
"GET /policies/instance/",
// Oauth callback
"/oauth2/callback",
// Asset delivery
/^(GET|HEAD) \/guilds\/\d+\/widget\.(json|png)/,
/^(GET|HEAD) \/guilds\/\d+\/shield\.svg/,
// Connections
/^(POST|HEAD) \/connections\/\w+\/callback/,
// Image proxy
/^(GET|HEAD) \/imageproxy\/[A-Za-z0-9+/]\/\d+x\d+\/.+/,
];
export const API_PREFIX = /^\/api(\/v\d+)?/;
export const API_PREFIX_TRAILING_SLASH = /^\/api(\/v\d+)?\//;
declare global {
// eslint-disable-next-line @typescript-eslint/no-namespace
namespace Express {
interface Request {
user_id: string;
user_bot: boolean;
tokenData: UserTokenData;
token: { id: string; iat: number; ver?: number; did?: string };
user: User;
session?: Session;
rights: Rights;
fingerprint?: string;
}
}
}
export async function Authentication(req: Request, res: Response, next: NextFunction) {
if (req.method === "OPTIONS") return res.sendStatus(204);
const url = req.url.replace(API_PREFIX, "");
if (req.headers.cookie?.split("; ").find((x) => x.startsWith("__sb_sessid=")))
req.fingerprint = req.headers.cookie
.split("; ")
.find((x) => x.startsWith("__sb_sessid="))!
.split("=")[1];
// for some reason we need to require here, else the openapi generator fails with "route is not a function"
else res.setHeader("Set-Cookie", `__sb_sessid=${(req.fingerprint = (await require("../util")).randomString(32))}; Secure; HttpOnly; SameSite=None; Path=/`);
if (
NO_AUTHORIZATION_ROUTES.some((x) => {
if (typeof x !== "string") {
return x.test(req.method + " " + url);
}
const fullRoute = req.method + " " + url;
if (req.method === "HEAD") {
const urlPart = x.split(" ").slice(1).join(" ");
if (urlPart.endsWith("/")) {
return url.startsWith(urlPart);
} else {
return url === urlPart;
}
}
if (x.endsWith("/")) {
return fullRoute.startsWith(x);
} else {
return fullRoute === x;
}
})
)
return next();
if (!req.headers.authorization) return next(new HTTPError("Missing Authorization Header", 401));
try {
const { decoded, user, session } = (req.tokenData = await checkToken(req.headers.authorization, {
ipAddress: req.ip,
fingerprint: req.fingerprint,
}));
req.token = decoded;
req.user_id = decoded.id;
req.user_bot = user.bot;
req.user = user;
req.session = session;
req.rights = new Rights(Number(user.rights));
return next();
} catch (error) {
if (error instanceof HTTPError) {
return next(error);
}
return next(new HTTPError(error!.toString(), 400));
}
}
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