diff --git a/api/src/middlewares/Authentication.ts b/api/src/middlewares/Authentication.ts
new file mode 100644
index 00000000..01b7ef57
--- /dev/null
+++ b/api/src/middlewares/Authentication.ts
@@ -0,0 +1,48 @@
+import { NextFunction, Request, Response } from "express";
+import { HTTPError } from "lambert-server";
+import { checkToken, Config } from "@fosscord/server-util";
+
+export const NO_AUTHORIZATION_ROUTES = [
+ /^\/api(\/v\d+)?\/auth\/login/,
+ /^\/api(\/v\d+)?\/auth\/register/,
+ /^\/api(\/v\d+)?\/webhooks\//,
+ /^\/api(\/v\d+)?\/ping/,
+ /^\/api(\/v\d+)?\/gateway/,
+ /^\/api(\/v\d+)?\/experiments/,
+ /^\/api(\/v\d+)?\/guilds\/\d+\/widget\.(json|png)/
+];
+
+export const API_PREFIX = /^\/api(\/v\d+)?/;
+export const API_PREFIX_TRAILING_SLASH = /^\/api(\/v\d+)?\//;
+
+declare global {
+ namespace Express {
+ interface Request {
+ user_id: any;
+ user_bot: boolean;
+ token: any;
+ }
+ }
+}
+
+export async function Authentication(req: Request, res: Response, next: NextFunction) {
+ if (req.method === "OPTIONS") return res.sendStatus(204);
+ if (!req.url.startsWith("/api")) return next();
+ const apiPath = req.url.replace(API_PREFIX, "");
+ if (apiPath.startsWith("/invites") && req.method === "GET") return next();
+ if (NO_AUTHORIZATION_ROUTES.some((x) => x.test(req.url))) return next();
+ if (!req.headers.authorization) return next(new HTTPError("Missing Authorization Header", 401));
+
+ try {
+ const { jwtSecret } = Config.get().security;
+
+ const { decoded, user }: any = await checkToken(req.headers.authorization, jwtSecret);
+
+ req.token = decoded;
+ req.user_id = decoded.id;
+ req.user_bot = user.bot;
+ return next();
+ } catch (error) {
+ return next(new HTTPError(error.toString(), 400));
+ }
+}
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