Extract code for error messages for better reusability

+ Create function for generating permission errors

src/Controllers/admin.controller.ts

@@ -1,22 +1,19 @@
 import prisma from "../lib/prisma";
 import { Request, Response } from "express";
+import { AdminLevel } from "@prisma/client";
 
-// requires: auth(elevated)
-export const getAllAdmins = async (req: Request, res: Response) => {
-  if (!req.auth?.isAuthenticated) {
-    return res.status(500).json({
+const AUTH_ERROR = {
   type: "failure",
   payload: {
     message: "The server was not able to validate your credentials; Please try again later",
   },
-    });
-  }
+};
 
-  if (req.auth.permission_level !== "ELEVATED") {
-    return res.status(403).json({
+const createInsufficientPermissionsError = (required: AdminLevel = "ELEVATED") => ({
   type: "error",
   payload: {
     message: "You do not have sufficient permissions to use this feature",
+    required_level: required,
   },
   _links: [
     {
@@ -25,7 +22,16 @@ export const getAllAdmins = async (req: Request, res: Response) => {
       type: "POST",
     },
   ],
-    });
+});
+
+// requires: auth(elevated)
+export const getAllAdmins = async (req: Request, res: Response) => {
+  if (!req.auth?.isAuthenticated) {
+    return res.status(500).json(AUTH_ERROR);
+  }
+
+  if (req.auth.permission_level !== "ELEVATED") {
+    return res.status(403).json(createInsufficientPermissionsError());
   }
 
   // TODO: Add exception handling