Added security classes and draft version of ResourceVoter

lib/Controller/Errors.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace OCA\OrganizationFolders\Controller;
+
+use Closure;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\JSONResponse;
+
+use OCA\OrganizationFolders\Errors\NotFoundException;
+
+trait Errors {
+	private function errorResponse(\Exception $e, $status = Http::STATUS_BAD_REQUEST): JSONResponse {
+		$response = ['error' => get_class($e), 'message' => $e->getMessage()];
+		return new JSONResponse($response, $status);
+	}
+
+    protected function handleNotFound(Closure $callback): JSONResponse {
+		try {
+			return new JSONResponse($callback());
+		} catch (NotFoundException $e) {
+			return $this->errorResponse($e, Http::STATUS_NOT_FOUND);
+		} catch (\Exception $e) {
+            return $this->errorResponse($e);
+        }
+	}
+
+	protected function handleErrors(Closure $callback): JSONResponse {
+		try {
+			return new JSONResponse($callback());
+		} catch (\Exception $e) {
+            return $this->errorResponse($e);
+        }
+	}
+}