BETTERZON-38: Added error handler, preparation for DB accessing

Backend/src/middleware/error.middleware.ts

@@ -0,0 +1,15 @@
+import HttpException from "../common/http-exception";
+import { Request, Response, NextFunction } from "express";
+
+export const errorHandler = (
+    error: HttpException,
+    request: Request,
+    response: Response,
+    next: NextFunction
+) => {
+    const status = error.statusCode || 500;
+    const message =
+        error.message || "It's not you. It's us. We are having some problems.";
+
+    response.status(status).send(message);
+};

Backend/src/middleware/notFound.middleware.ts

@@ -0,0 +1,12 @@
+import { Request, Response, NextFunction } from "express";
+
+export const notFoundHandler = (
+    request: Request,
+    response: Response,
+    next: NextFunction
+) => {
+
+    const message = "Resource not found";
+
+    response.status(404).send(message);
+};