Added basic status api key checking middleware

ref #56

src/middlewares/StatsAuth.ts

@@ -0,0 +1,41 @@
+import * as argon2 from "argon2";
+import { Request, Response } from 'express';
+import { getConnectionManager } from 'typeorm';
+import { StatsClient } from '../models/entities/StatsClient';
+
+/**
+ * This middleware handels the authentification of stats client api tokens.
+ * The tokens have to be provided via Bearer auth header.
+ * @param req Express request object.
+ * @param res Express response object.
+ * @param next Next function to call on success.
+ */
+const StatsAuth = async (req: Request, res: Response, next: () => void) => {
+    let provided_token: string = req.headers["authorization"];
+    if (provided_token == "" || provided_token === undefined || provided_token === null) {
+        res.status(401).send("No api token provided.");
+        return;
+    }
+
+    let prefix = "";
+    try {
+        provided_token = provided_token.replace("Bearer ", "");
+        prefix = provided_token.split(".")[0];
+    } catch (error) {
+        res.status(401).send("Api token non-existant or invalid syntax.");
+        return;
+    }
+
+    const client = await getConnectionManager().get().getRepository(StatsClient).findOne({ prefix: prefix });
+    if (!client) {
+        res.status(401).send("Api token non-existant or invalid syntax.");
+        return;
+    }
+    if (!(await argon2.verify(client.key, provided_token))) {
+        res.status(401).send("Api token invalid.");
+        return;
+    }
+
+    next();
+}
+export default StatsAuth;