API: Move API Key auth to middelware file

api/middleware/apiKeyAuth.js

@@ -0,0 +1,15 @@
+const ACCESS_TOKEN = process.env.API_ACCESS_TOKEN;
+
+function isAuthorized(req, res = null) {
+  const providedToken = req.headers['apikey'];
+  if (providedToken !== ACCESS_TOKEN) {
+    if (res) {
+      res.status(401).json({ error: 'Unauthorized' });
+    }
+    return false;
+  }
+
+  return true;
+}
+
+module.exports = { isAuthorized };