feat: gestart met implementeren van assignment service en controller laag

backend/src/controllers/assignments.ts

@@ -0,0 +1,30 @@
+import { Request, Response } from 'express'
+import { getAssignment } from '../services/assignments';
+
+// typescript is annoywith with parameter forwarding from class.ts
+interface AssignmentParams {
+    classid: string;
+    id: string;
+}
+
+export async function getAssignmentHandler(
+    req: Request<AssignmentParams>,
+    res: Response,
+): Promise<void> {
+    const id = +req.params.id;
+    const classid = req.params.classid;
+
+    if (isNaN(id)) {
+        res.status(400).json({ error: "Assignment id must be a number" });
+        return;
+    }
+
+    const assignment = await getAssignment(classid, id);
+
+    if (!assignment) {
+        res.status(404).json({ error: "Assignment not found" });
+        return;
+    }
+
+    res.json(assignment);
+}