Début d'ajout pour la gestion du login

Front/skydivelogs-app/src/services/authentication.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+
+import { BehaviorSubject, Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+
+import { environment } from '../environments/environment';
+import { User } from '../models/user';
+
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AuthenticationService {
+  private currentUserSubject: BehaviorSubject<User>;
+  public currentUser: Observable<User>;
+
+  constructor(private http: HttpClient) {
+    this.currentUserSubject = new BehaviorSubject<User>(JSON.parse(localStorage.getItem('currentUser')));
+    this.currentUser = this.currentUserSubject.asObservable();
+  }
+
+  public get currentUserValue(): User {
+    return this.currentUserSubject.value;
+  }
+
+  login(username: string, password: string) {
+    return this.http.post<any>(`${environment.apiUrl}/users/authenticate`, { username, password })
+      .pipe(map(user => {
+        // store user details and basic auth credentials in local storage to keep user logged in between page refreshes
+        user.authdata = window.btoa(username + ':' + password);
+        localStorage.setItem('currentUser', JSON.stringify(user));
+        this.currentUserSubject.next(user);
+        return user;
+      }));
+  }
+
+  logout() {
+    // remove user from local storage to log user out
+    localStorage.removeItem('currentUser');
+    this.currentUserSubject.next(null);
+  }
+}