feat: implement authentication with JWT and user management

frontend/src/app/service/user.service.ts

@@ -1,25 +1,24 @@
-import { inject, Injectable } from '@angular/core';
+import { Injectable } from '@angular/core';
 import { HttpClient } from '@angular/common/http';
 import { BehaviorSubject, catchError, EMPTY, Observable, tap } from 'rxjs';
 import { User } from '../model/User';
+import { environment } from '@environments/environment';
 
 @Injectable({
   providedIn: 'root',
 })
 export class UserService {
-  private http: HttpClient = inject(HttpClient);
+  private apiUrl = `${environment.apiUrl}/api/users`;
   private currentUserSubject = new BehaviorSubject<User | null>(null);
-  public currentUser$ = this.currentUserSubject.asObservable();
 
-  constructor() {
-    this.getCurrentUser().subscribe();
+  constructor(private http: HttpClient) {}
+
+  public getUserById(id: number): Observable<User> {
+    return this.http.get<User>(`${this.apiUrl}/${id}`);
   }
 
-  public getUser(id: string): Observable<User | null> {
-    return this.http.get<User | null>(`/backend/user/${id}`).pipe(
-      catchError(() => EMPTY),
-      tap((user) => this.currentUserSubject.next(user))
-    );
+  public getUserByUsername(username: string): Observable<User> {
+    return this.http.get<User>(`${this.apiUrl}/username/${username}`);
   }
 
   public getCurrentUser(): Observable<User | null> {
@@ -52,20 +51,4 @@ export class UserService {
       })
       .pipe(tap((user) => this.currentUserSubject.next(user)));
   }
-
-  public getOrCreateUser(profile: Record<string, unknown>): Observable<User> {
-    const info = profile['info'] as Record<string, unknown> | undefined;
-    const id = (info?.['sub'] as string) || (profile['sub'] as string);
-    const username =
-      (info?.['preferred_username'] as string) ||
-      (profile['preferred_username'] as string) ||
-      (profile['email'] as string) ||
-      (profile['name'] as string);
-
-    if (!id || !username) {
-      throw new Error('Invalid user profile data');
-    }
-
-    return this.createUser(id, username);
-  }
 }