feat(backend): Eigen error handler toegevoegd.

Hiervoor was ook refactoring aan de exception-klassen nodig.

backend/src/exceptions/bad-request-exception.ts

@@ -0,0 +1,10 @@
+import {ExceptionWithHttpState} from "./exception-with-http-state.js";
+
+/**
+ * Exception for HTTP 400 Bad Request
+ */
+export abstract class BadRequestException extends ExceptionWithHttpState {
+    constructor(error: string) {
+        super(400, error);
+    }
+}

backend/src/exceptions/conflict-exception.ts

@@ -0,0 +1,12 @@
+import {ExceptionWithHttpState} from "./exception-with-http-state.js";
+
+/**
+ * Exception for HTTP 409 Conflict
+ */
+export class ConflictException extends ExceptionWithHttpState {
+    public status = 409;
+
+    constructor(error: string) {
+        super(409, error);
+    }
+}

backend/src/exceptions/exception-with-http-state.ts

@@ -0,0 +1,9 @@
+/**
+ * Exceptions which are associated with a HTTP error code.
+ */
+export abstract class ExceptionWithHttpState extends Error {
+    constructor(public status: number, public error: string) {
+        super(error);
+    }
+}
+

backend/src/exceptions/forbidden-exception.ts

@@ -0,0 +1,12 @@
+import {ExceptionWithHttpState} from "./exception-with-http-state.js";
+
+/**
+ * Exception for HTTP 403 Forbidden
+ */
+export class ForbiddenException extends ExceptionWithHttpState {
+    status = 403;
+
+    constructor(message: string = 'Forbidden') {
+        super(403, message);
+    }
+}

backend/src/exceptions/not-found-exception.ts

@@ -0,0 +1,12 @@
+import {ExceptionWithHttpState} from "./exception-with-http-state.js";
+
+/**
+ * Exception for HTTP 404 Not Found
+ */
+export class NotFoundException extends ExceptionWithHttpState {
+    public status = 404;
+
+    constructor(error: string) {
+        super(404, error);
+    }
+}

backend/src/exceptions/unauthorized-exception.ts

@@ -0,0 +1,10 @@
+import {ExceptionWithHttpState} from "./exception-with-http-state.js";
+
+/**
+ * Exception for HTTP 401 Unauthorized
+ */
+export class UnauthorizedException extends ExceptionWithHttpState {
+    constructor(message: string = 'Unauthorized') {
+        super(401, message);
+    }
+}