Début d'ajout pour la gestion du login

Front/skydivelogs-app/src/app/login/login.component.ts

@@ -0,0 +1,67 @@
+import { Component, OnInit } from '@angular/core';
+import { Router, ActivatedRoute } from '@angular/router';
+import { FormBuilder, FormGroup, Validators } from '@angular/forms';
+
+import { first } from 'rxjs/operators';
+
+import { AuthenticationService } from '../../services/authentication.service';
+
+
+@Component({
+  selector: 'app-login',
+  templateUrl: './login.component.html',
+  styleUrls: ['./login.component.css']
+})
+export class LoginComponent implements OnInit {
+  loginForm: FormGroup;
+  loading = false;
+  submitted = false;
+  returnUrl: string;
+  error = '';
+
+  constructor(
+    private formBuilder: FormBuilder,
+    private route: ActivatedRoute,
+    private router: Router,
+    private authenticationService: AuthenticationService
+  ) {
+    // redirect to home if already logged in
+    if (this.authenticationService.currentUserValue) {
+      this.router.navigate(['/']);
+    }
+  }
+
+  ngOnInit() {
+    this.loginForm = this.formBuilder.group({
+      username: ['', Validators.required],
+      password: ['', Validators.required]
+    });
+
+    // get return url from route parameters or default to '/'
+    this.returnUrl = this.route.snapshot.queryParams['returnUrl'] || '/';
+  }
+
+  // convenience getter for easy access to form fields
+  get f() { return this.loginForm.controls; }
+
+  onSubmit() {
+    this.submitted = true;
+
+    // stop here if form is invalid
+    if (this.loginForm.invalid) {
+      return;
+    }
+
+    this.loading = true;
+    this.authenticationService.login(this.f.username.value, this.f.password.value)
+      .pipe(first())
+      .subscribe(
+        data => {
+          this.router.navigate([this.returnUrl]);
+        },
+        error => {
+          this.error = error;
+          this.loading = false;
+        });
+  }
+}