refactoring

api/src/shared/service/system.helper.service.ts

@@ -0,0 +1,38 @@
+import { Injectable } from "@nestjs/common";
+import { User, Cylinder, Key } from "src/model/entitites";
+import { KeySystemRepository, CylinderRepository, KeyRepository } from "src/model/repositories";
+
+@Injectable()
+export class ManageHelperService {
+
+  constructor(
+    private readonly systemRepository: KeySystemRepository,
+    private readonly cylinderRepository: CylinderRepository,
+    private readonly keyRepo: KeyRepository,
+  ) {}
+
+
+  /**
+   * Gibt den Cylinder zurück wenn der user ein Manager ist. Gibt null zurück wenn er nicht existiert oder der 
+   * User den Cylinder nicht managen darf.
+   * @param user User
+   * @param id ID vom Cylinder
+   * @returns Cylinder | null
+   */
+  async getCylinderIfUserCanManage(user: User, id: string, relations: string[] = ['keys', 'system']): Promise<Cylinder> {
+    const cylinder = await this.cylinderRepository.findOne({
+      where: { id: id, system: { managers: { id: user.id } } },
+      relations: relations,
+    });
+    return cylinder;
+  }
+
+
+  async getUsersKeys(user: User): Promise<Key[]> {
+    const keys = await this.keyRepo.find({
+      where: { cylinder: { system: { managers: { id: user.id } } } },
+      relations: ['cylinder', 'cylinder.system', 'customer'],
+    });
+    return keys;
+  }
+}