feat: add, delete student route met user logic + .js in files

backend/src/app.ts

@@ -16,6 +16,7 @@ import loginRouter from './routes/login.js';
 const app: Express = express();
 const port: string | number = getNumericEnvVar(EnvVars.Port);
 
+app.use(express.json());
 
 // TODO Replace with Express routes
 app.get('/', (_, res: Response) => {

backend/src/controllers/assignments.ts

@@ -1,5 +1,5 @@
 import { Request, Response } from 'express'
-import { getAllAssignments, getAssignment } from '../services/assignments';
+import { getAllAssignments, getAssignment } from '../services/assignments.js';
 
 // typescript is annoy with with parameter forwarding from class.ts
 interface AssignmentParams {
@@ -41,4 +41,4 @@ export async function getAssignmentHandler(
     }
 
     res.json(assignment);
-}
+}

backend/src/controllers/classes.ts

@@ -1,6 +1,5 @@
 import { Request, Response } from 'express';
-import { getAllClasses, getClass, getClassStudents, getClassTeacherInvitations } from '../services/class';
-import { ClassDTO } from '../interfaces/classes';
+import { getAllClasses, getClass, getClassStudents, getClassTeacherInvitations } from '../services/class.js';
 
 export async function getAllClassesHandler(
     req: Request,
@@ -61,10 +60,10 @@ export async function getTeacherInvitationsHandler(
 ): Promise<void> {
     const classId = req.params.id;
     const full = req.query.full === "true"; // TODO: not implemented yet
-    
+
     const invitations = await getClassTeacherInvitations(classId, full);
 
     res.json({
         invitations: invitations,
     });
-}
+}

backend/src/controllers/groups.ts

@@ -1,5 +1,5 @@
 import { Request, Response } from 'express';
-import { getAllGroups, getGroup } from '../services/groups';
+import { getAllGroups, getGroup } from '../services/groups.js';
 
 // typescript is annoywith with parameter forwarding from class.ts
 interface GroupParams {
@@ -52,4 +52,4 @@ export async function getAllGroupsHandler(
     res.json({
         groups: groups,
     });
-}
+}

backend/src/controllers/students.ts

@@ -1,53 +1,33 @@
 import { Request, Response } from 'express';
-import { getAllStudents, getStudent, getStudentClasses, getStudentClassIds } from '../services/students';
-import { ClassDTO } from '../interfaces/classes';
-import { getAllAssignments } from '../services/assignments';
+import {
+    getStudentClasses,
+    getStudentClassIds,
+    StudentService
+} from '../services/students.js';
+import { ClassDTO } from '../interfaces/classes.js';
+import { getAllAssignments } from '../services/assignments.js';
+import {createUserHandler, deleteUserHandler, getAllUsersHandler, getUserHandler} from "./users.js";
+import { Student } from "../entities/users/student.entity.js";
 
 // TODO: accept arguments (full, ...)
 // TODO: endpoints
-export async function getAllStudentsHandler (
-    req: Request,
-    res: Response,
-): Promise<void> {
-    try {
-        const students = await getAllStudents();
-
-        res.json({
-            students: students
-        });
-    } catch (error) {
-        console.error('Error fetching learning objects:', error);
-        res.status(500).json({ error: 'Internal server error' });
-    }
+export async function getAllStudentsHandler (req: Request, res: Response): Promise<void> {
+    await getAllUsersHandler<Student>(req, res, new StudentService());
 }
 
-export async function getStudentHandler(
-    req: Request,
-    res: Response,
-): Promise<void> {
-    try {
-        const username = req.params.id;
-        const student = await getStudent(username);
-    
-        if (!student) {
-            res.status(404).json({ error: "Student not found" });
-            return;
-        } else {
-            student.endpoints = {
-                classes: `/student/${req.params.id}/classes`,
-                questions: `/student/${req.params.id}/submissions`,
-                invitations: `/student/${req.params.id}/assignments`,
-                groups: `/student/${req.params.id}/groups`,
-            }
-            res.json(student);
-        }
-
-    } catch (error) {
-        console.error('Error fetching learning objects:', error);
-        res.status(500).json({ error: 'Internal server error' });
-    }
+export async function getStudentHandler(req: Request, res: Response): Promise<void> {
+    await getUserHandler<Student>(req, res, new StudentService());
 }
 
+export async function createStudentHandler(req: Request, res: Response): Promise<void> {
+    await createUserHandler<Student>(req, res, new StudentService(), Student);
+}
+
+export async function deleteStudentHandler(req: Request, res: Response): Promise<void> {
+    await deleteUserHandler<Student>(req, res, new StudentService());
+}
+
+
 export async function getStudentClassesHandler (
     req: Request,
     res: Response,
@@ -75,6 +55,7 @@ export async function getStudentClassesHandler (
     }
 }
 
+// TODO
 // Might not be fully correct depending on if
 // a class has an assignment, that all students
 // have this assignment.
@@ -92,4 +73,6 @@ export async function getStudentAssignmentsHandler(
     res.json({
         assignments: assignments
     });
-}
+}
+
+

backend/src/controllers/users.ts

@@ -0,0 +1,106 @@
+import { Request, Response } from 'express';
+import { UserService } from "../services/users.js";
+import {UserDTO} from "../interfaces/user.js";
+import {User} from "../entities/users/user.entity.js";
+
+export async function getAllUsersHandler<T extends User>(
+    req: Request,
+    res: Response,
+    service: UserService<T>
+):  Promise<void> {
+    try {
+        const full = req.query.full === 'true';
+
+        let users: UserDTO[] | string[] = full
+            ? await service.getAllUsers()
+            : await service.getAllUserIds();
+
+        if (!users){
+            res.status(404).json({ error: `Users not found.` });
+            return;
+        }
+
+        res.status(201).json(users);
+
+    } catch (error) {
+        console.error("❌ Error fetching users:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}
+
+export async function getUserHandler<T extends User>(
+    req: Request,
+    res: Response,
+    service: UserService<T>
+):  Promise<void> {
+    try {
+        const username = req.params.username as string;
+
+        if (!username) {
+            res.status(400).json({ error: 'Missing required field: username' });
+            return;
+        }
+
+        const user = await service.getUserByUsername(username);
+
+        if (!user){
+            res.status(404).json({ error: `User with username '${username}' not found.` });
+            return;
+        }
+
+        res.status(201).json(user);
+
+    } catch (error) {
+        console.error("❌ Error fetching users:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}
+
+export async function createUserHandler<T extends User>(
+    req: Request,
+    res: Response,
+    service: UserService<T>,
+    UserClass: new () => T
+) {
+    try {
+        console.log("req", req)
+        const userData = req.body as UserDTO;
+
+        if (!userData.username || !userData.firstName || !userData.lastName) {
+            res.status(400).json({ error: "Missing required fields: username, firstName, lastName" });
+            return;
+        }
+
+        const newUser = await service.createUser(userData, UserClass);
+        res.status(201).json(newUser);
+    } catch (error) {
+        console.error("❌ Error creating user:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}
+
+export async function deleteUserHandler<T extends User> (
+    req: Request,
+    res: Response,
+    service: UserService<T>
+) {
+    try {
+        const username = req.params.username;
+
+        if (!username) {
+            res.status(400).json({ error: "Missing required field: username" });
+            return;
+        }
+
+        const deletedUser = await service.deleteUser(username);
+        if (!deletedUser) {
+            res.status(404).json({ error: `User with username '${username}' not found.` });
+            return;
+        }
+
+        res.status(200).json(deletedUser);
+    } catch (error) {
+        console.error("❌ Error deleting user:", error);
+        res.status(500).json({ error: "Internal server error" });
+    }
+}

backend/src/data/repositories.ts

@@ -59,7 +59,7 @@ function repositoryGetter<T extends AnyEntity, R extends EntityRepository<T>>(
 }
 
 /* Users */
-export const getUserRepository = repositoryGetter<User, UserRepository>(User);
+export const getUserRepository = repositoryGetter<User, UserRepository<User>>(User);
 export const getStudentRepository = repositoryGetter<
     Student,
     StudentRepository

backend/src/data/users/student-repository.ts

@@ -1,11 +1,4 @@
-import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Student } from '../../entities/users/student.entity.js';
+import {UserRepository} from "./user-repository.js";
 
-export class StudentRepository extends DwengoEntityRepository<Student> {
-    public findByUsername(username: string): Promise<Student | null> {
-        return this.findOne({ username: username });
-    }
-    public deleteByUsername(username: string): Promise<void> {
-        return this.deleteWhere({ username: username });
-    }
-}
+export class StudentRepository extends UserRepository<Student> {}

backend/src/data/users/teacher-repository.ts

@@ -1,11 +1,4 @@
-import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Teacher } from '../../entities/users/teacher.entity.js';
+import {UserRepository} from "./user-repository.js";
 
-export class TeacherRepository extends DwengoEntityRepository<Teacher> {
-    public findByUsername(username: string): Promise<Teacher | null> {
-        return this.findOne({ username: username });
-    }
-    public deleteByUsername(username: string): Promise<void> {
-        return this.deleteWhere({ username: username });
-    }
-}
+export class TeacherRepository extends UserRepository<Teacher> {}

backend/src/data/users/user-repository.ts

@@ -1,11 +1,11 @@
 import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { User } from '../../entities/users/user.entity.js';
 
-export class UserRepository extends DwengoEntityRepository<User> {
-    public findByUsername(username: string): Promise<User | null> {
-        return this.findOne({ username: username });
+export class UserRepository<T extends User> extends DwengoEntityRepository<T> {
+    public findByUsername(username: string): Promise<T | null> {
+        return this.findOne({ username } as Partial<T>);
     }
     public deleteByUsername(username: string): Promise<void> {
-        return this.deleteWhere({ username: username });
+        return this.deleteWhere({ username } as Partial<T>);
     }
 }

backend/src/entities/content/learning-object.entity.ts

@@ -13,6 +13,15 @@ import { Attachment } from './attachment.entity.js';
 import { Teacher } from '../users/teacher.entity.js';
 import { LearningObjectRepository } from '../../data/content/learning-object-repository.js';
 
+@Embeddable()
+export class ReturnValue {
+    @Property({ type: 'string' })
+    callbackUrl!: string;
+
+    @Property({ type: 'json' })
+    callbackSchema!: string;
+}
+
 @Entity({ repository: () => LearningObjectRepository })
 export class LearningObject {
     @PrimaryKey({ type: 'string' })
@@ -88,15 +97,6 @@ export class EducationalGoal {
     id!: string;
 }
 
-@Embeddable()
-export class ReturnValue {
-    @Property({ type: 'string' })
-    callbackUrl!: string;
-
-    @Property({ type: 'json' })
-    callbackSchema!: string;
-}
-
 export enum ContentType {
     Markdown = 'text/markdown',
     Image = 'image/image',

backend/src/entities/users/student.entity.ts

@@ -11,12 +11,4 @@ export class Student extends User {
 
     @ManyToMany(() => Group)
     groups!: Collection<Group>;
-
-    constructor(
-        public username: string,
-        public firstName: string,
-        public lastName: string
-    ) {
-        super();
-    }
 }

backend/src/interfaces/assignments.ts

@@ -1,6 +1,5 @@
-import { Assignment } from "../entities/assignments/assignment.entity";
-import { Class } from "../entities/classes/class.entity";
-import { GroupDTO, mapToGroupDTO } from "./groups";
+import { Assignment } from "../entities/assignments/assignment.entity.js";
+import { GroupDTO, mapToGroupDTO } from "./groups.js";
 
 export interface AssignmentDTO {
     id: number,
@@ -34,4 +33,4 @@ export function mapToAssignmentDTO(assignment: Assignment): AssignmentDTO {
         language: assignment.learningPathLanguage,
         // groups: assignment.groups.map(mapToGroupDTO),
     };
-}
+}

backend/src/interfaces/classes.ts

@@ -1,4 +1,4 @@
-import { Class } from "../entities/classes/class.entity";
+import { Class } from "../entities/classes/class.entity.js";
 
 export interface ClassDTO {
     id: string;

backend/src/interfaces/groups.ts

@@ -1,6 +1,6 @@
-import { Group } from "../entities/assignments/group.entity";
-import { AssignmentDTO, mapToAssignmentDTO } from "./assignments";
-import { mapToStudentDTO, StudentDTO } from "./students";
+import { Group } from "../entities/assignments/group.entity.js";
+import { AssignmentDTO, mapToAssignmentDTO } from "./assignments.js";
+import { mapToStudentDTO, StudentDTO } from "./students.js";
 
 export interface GroupDTO {
     assignment: number | AssignmentDTO,
@@ -10,7 +10,7 @@ export interface GroupDTO {
 
 export function mapToGroupDTO(group: Group): GroupDTO {
     return {
-        assignment: mapToAssignmentDTO(group.assignment, group.assignment.within),
+        assignment: mapToAssignmentDTO(group.assignment), // ERROR: , group.assignment.within),
         groupNumber: group.groupNumber,
         members: group.members.map(mapToStudentDTO),
     }
@@ -22,4 +22,4 @@ export function mapToGroupDTOId(group: Group): GroupDTO {
         groupNumber: group.groupNumber,
         members: group.members.map(member => member.username),
     }
-}
+}

backend/src/interfaces/students.ts

@@ -1,4 +1,4 @@
-import { Student } from "../entities/users/student.entity";
+import { Student } from "../entities/users/student.entity.js";
 
 export interface StudentDTO {
     id: string;
@@ -20,4 +20,13 @@ export function mapToStudentDTO(student: Student): StudentDTO {
         firstName: student.firstName,
         lastName: student.lastName,
     };
-}
+}
+
+export function mapToStudent(studentData: StudentDTO): Student {
+    const student = new Student();
+    student.username = studentData.username;
+    student.firstName = studentData.firstName;
+    student.lastName = studentData.lastName;
+
+    return student;
+}

backend/src/interfaces/teacher-invitation.ts

@@ -1,6 +1,6 @@
-import { TeacherInvitation } from "../entities/classes/teacher-invitation.entity";
-import { ClassDTO, mapToClassDTO } from "./classes";
-import { mapToTeacherDTO, TeacherDTO } from "./teacher";
+import { TeacherInvitation } from "../entities/classes/teacher-invitation.entity.js";
+import { ClassDTO, mapToClassDTO } from "./classes.js";
+import { mapToTeacherDTO, TeacherDTO } from "./teacher.js";
 
 export interface TeacherInvitationDTO {
     sender: string | TeacherDTO,
@@ -22,4 +22,4 @@ export function mapToTeacherInvitationDTOIds(invitation: TeacherInvitation): Tea
         receiver: invitation.receiver.username,
         class: invitation.class.classId,
     };
-}
+}

backend/src/interfaces/teacher.ts

@@ -1,4 +1,4 @@
-import { Teacher } from "../entities/users/teacher.entity";
+import { Teacher } from "../entities/users/teacher.entity.js";
 
 export interface TeacherDTO {
     id: string;
@@ -20,4 +20,4 @@ export function mapToTeacherDTO(teacher: Teacher): TeacherDTO {
         firstName: teacher.firstName,
         lastName: teacher.lastName,
     };
-}
+}

backend/src/interfaces/user.ts

@@ -0,0 +1,30 @@
+import { User } from "../entities/users/user.entity.js";
+
+export interface UserDTO {
+    id?: string,
+    username: string;
+    firstName: string;
+    lastName: string;
+    endpoints?: {
+        self: string;
+        classes: string;
+        questions: string;
+        invitations: string;
+    };
+}
+
+export function mapToUserDTO(user: User): UserDTO {
+    return {
+        id: user.username,
+        username: user.username,
+        firstName: user.firstName,
+        lastName: user.lastName,
+    };
+}
+
+export function mapToUser<T extends User>(userData: UserDTO, userInstance: T): T {
+    userInstance.username = userData.username;
+    userInstance.firstName = userData.firstName;
+    userInstance.lastName = userData.lastName;
+    return userInstance;
+}

backend/src/routes/assignment.ts

@@ -1,5 +1,5 @@
 import express from 'express'
-import { getAllAssignmentsHandler, getAssignmentHandler } from '../controllers/assignments';
+import { getAllAssignmentsHandler, getAssignmentHandler } from '../controllers/assignments.js';
 import groupRouter from './group.js';
 
 const router = express.Router({ mergeParams: true });
@@ -28,4 +28,4 @@ router.get('/:id/questions', (req, res) => {
 
 router.use('/:assignmentid/groups', groupRouter);
 
-export default router
+export default router

backend/src/routes/class.ts

@@ -1,5 +1,5 @@
 import express from 'express'
-import { getAllClassesHandler, getClassHandler, getClassStudentsHandler, getTeacherInvitationsHandler } from '../controllers/classes';
+import { getAllClassesHandler, getClassHandler, getClassStudentsHandler, getTeacherInvitationsHandler } from '../controllers/classes.js';
 import assignmentRouter from './assignment.js';
 
 const router = express.Router();
@@ -16,4 +16,4 @@ router.get('/:id/students', getClassStudentsHandler);
 
 router.use('/:classid/assignments', assignmentRouter);
 
-export default router
+export default router

backend/src/routes/group.ts

@@ -1,5 +1,5 @@
 import express from 'express'
-import { getAllGroupsHandler, getGroupHandler } from '../controllers/groups';
+import { getAllGroupsHandler, getGroupHandler } from '../controllers/groups.js';
 const router = express.Router({ mergeParams: true });
 
 // root endpoint used to search objects
@@ -15,4 +15,4 @@ router.get('/:id/question', (req, res) => {
     });
 })
 
-export default router
+export default router

backend/src/routes/student.ts

@@ -1,12 +1,24 @@
 import express from 'express'
-import { getAllStudentsHandler, getStudentAssignmentsHandler, getStudentClassesHandler, getStudentHandler } from '../controllers/students';
+import {
+    createStudentHandler, deleteStudentHandler,
+    getAllStudentsHandler,
+    getStudentAssignmentsHandler,
+    getStudentClassesHandler,
+    getStudentHandler
+} from '../controllers/students.js';
 const router = express.Router();
 
 // root endpoint used to search objects
 router.get('/', getAllStudentsHandler);
 
+router.post('/', createStudentHandler);
+
+router.delete('/:username', deleteStudentHandler);
+
 // information about a student's profile
-router.get('/:id', getStudentHandler);
+router.get('/:username', getStudentHandler);
+
+
 
 // the list of classes a student is in
 router.get('/:id/classes', getStudentClassesHandler);
@@ -18,10 +30,10 @@ router.get('/:id/submissions', (req, res) => {
     });
 })
 
-  
+
 // the list of assignments a student has
 router.get('/:id/assignments', getStudentAssignmentsHandler);
-  
+
 // the list of groups a student is in
 router.get('/:id/groups', (req, res) => {
     res.json({
@@ -36,4 +48,4 @@ router.get('/:id/questions', (req, res) => {
     });
 })
 
-export default router
+export default router

backend/src/services/assignments.ts

@@ -1,5 +1,5 @@
-import { getAssignmentRepository, getClassRepository } from "../data/repositories";
-import { AssignmentDTO, mapToAssignmentDTO, mapToAssignmentDTOId } from "../interfaces/assignments";
+import { getAssignmentRepository, getClassRepository } from "../data/repositories.js";
+import { AssignmentDTO, mapToAssignmentDTO, mapToAssignmentDTOId } from "../interfaces/assignments.js";
 
 export async function getAllAssignments(classid: string, full: boolean): Promise<AssignmentDTO[]> {
     const classRepository = getClassRepository();
@@ -8,7 +8,7 @@ export async function getAllAssignments(classid: string, full: boolean): Promise
     if (!cls) {
         return [];
     }
-    
+
     const assignmentRepository = getAssignmentRepository();
     const assignments = await assignmentRepository.findAllAssignmentsInClass(cls);
 
@@ -26,7 +26,7 @@ export async function getAssignment(classid: string, id: number): Promise<Assign
     if (!cls) {
         return null;
     }
-    
+
     const assignmentRepository = getAssignmentRepository();
     const assignment = await assignmentRepository.findByClassAndId(cls, id);
 
@@ -35,4 +35,4 @@ export async function getAssignment(classid: string, id: number): Promise<Assign
     }
 
     return mapToAssignmentDTO(assignment);
-}
+}

backend/src/services/class.ts

@@ -1,8 +1,7 @@
-import { getClassRepository, getTeacherInvitationRepository } from "../data/repositories";
-import { Class } from "../entities/classes/class.entity";
-import { ClassDTO, mapToClassDTO } from "../interfaces/classes";
-import { mapToStudentDTO, StudentDTO } from "../interfaces/students";
-import { mapToTeacherInvitationDTO, mapToTeacherInvitationDTOIds, TeacherInvitationDTO } from "../interfaces/teacher-invitation";
+import { getClassRepository, getTeacherInvitationRepository } from "../data/repositories.js";
+import { ClassDTO, mapToClassDTO } from "../interfaces/classes.js";
+import { mapToStudentDTO, StudentDTO } from "../interfaces/students.js";
+import { mapToTeacherInvitationDTO, mapToTeacherInvitationDTOIds, TeacherInvitationDTO } from "../interfaces/teacher-invitation.js";
 
 export async function getAllClasses(full: boolean): Promise<ClassDTO[] | string[]> {
     const classRepository = getClassRepository();
@@ -11,7 +10,7 @@ export async function getAllClasses(full: boolean): Promise<ClassDTO[] | string[
     if (!classes) {
         return [];
     }
-    
+
     if (full) {
         return classes.map(mapToClassDTO);
     } else {
@@ -66,4 +65,4 @@ export async function getClassTeacherInvitations(classId: string, full: boolean)
     }
 
     return invitations.map(mapToTeacherInvitationDTOIds);
-}
+}

backend/src/services/groups.ts

@@ -1,9 +1,9 @@
-import { getAssignmentRepository, getClassRepository, getGroupRepository } from "../data/repositories";
-import { GroupDTO, mapToGroupDTO, mapToGroupDTOId } from "../interfaces/groups";
+import { getAssignmentRepository, getClassRepository, getGroupRepository } from "../data/repositories.js";
+import { GroupDTO, mapToGroupDTO, mapToGroupDTOId } from "../interfaces/groups.js";
 
 export async function getGroup(
-    classId: string, 
-    assignmentNumber: number, 
+    classId: string,
+    assignmentNumber: number,
     groupNumber: number,
     full: boolean,
 ): Promise<GroupDTO | null> {
@@ -64,4 +64,4 @@ export async function getAllGroups(
     }
 
     return groups.map(mapToGroupDTOId);
-}
+}

backend/src/services/students.ts

@@ -1,26 +1,13 @@
-import { getClassRepository, getStudentRepository } from "../data/repositories";
-import { Class } from "../entities/classes/class.entity";
-import { Student } from "../entities/users/student.entity";
-import { ClassDTO, mapToClassDTO } from "../interfaces/classes";
-import { StudentDTO, mapToStudentDTO } from "../interfaces/students";
+import { getClassRepository, getStudentRepository } from "../data/repositories.js";
+import { Class } from "../entities/classes/class.entity.js";
+import { Student } from "../entities/users/student.entity.js";
+import { ClassDTO, mapToClassDTO } from "../interfaces/classes.js";
+import {UserService} from "./users.js";
 
-
-export async function getAllStudents(): Promise<StudentDTO[]> {
-    const studentRepository = getStudentRepository();
-    const students = await studentRepository.find({});
-
-    return students.map(mapToStudentDTO);
-}
-
-export async function getStudent(username: string): Promise<StudentDTO | null> {
-    const studentRepository = getStudentRepository();
-    const student = await studentRepository.findByUsername(username);
-
-    if  (!student) { 
-        return null; 
+export class StudentService extends UserService<Student> {
+    constructor() {
+        super(getStudentRepository());
     }
-
-    return mapToStudentDTO(student);
 }
 
 async function fetchStudentClasses(username: string): Promise<Class[]> {

backend/src/services/users.ts

@@ -0,0 +1,39 @@
+import { UserRepository } from "../data/users/user-repository.js";
+import { UserDTO, mapToUser, mapToUserDTO } from "../interfaces/user.js";
+import {User} from "../entities/users/user.entity.js";
+
+export class UserService<T extends User> {
+    protected repository: UserRepository<T>;
+
+    constructor(repository: UserRepository<T>) {
+        this.repository = repository;
+    }
+
+    async getAllUsers(): Promise<UserDTO[]> {
+        const users = await this.repository.findAll();
+        return users.map(mapToUserDTO);
+    }
+
+    async getAllUserIds(): Promise<string[]> {
+        const users = await this.getAllUsers();
+        return users.map((user) => user.username);
+    }
+
+    async getUserByUsername(username: string): Promise<UserDTO | null> {
+        const user = await this.repository.findByUsername(username)
+        return user ? mapToUserDTO(user) : null;
+    }
+
+    async createUser(userData: UserDTO, UserClass: new () => T): Promise<T> {
+        const newUser = mapToUser(userData, new UserClass());
+        await this.repository.save(newUser);
+        return newUser;
+    }
+
+    async deleteUser(username: string): Promise<UserDTO | null> {
+        const user = await this.getUserByUsername(username);
+        if (!user) return null;
+        await this.repository.deleteByUsername(username)
+        return mapToUserDTO(user);
+    }
+}

backend/src/util/translationHelper.ts

@@ -1,7 +1,7 @@
 import fs from 'fs';
 import path from 'path';
 import yaml from 'js-yaml';
-import {FALLBACK_LANG} from "../../config";
+import {FALLBACK_LANG} from "../config.js";
 
 export function loadTranslations<T>(language: string): T {
     try {