First, I must mention that I'm a beginner in Angular and I'm kind of
stucked with my sample code.
I created some simple login app which prompts for username and password,
calls login REST service (written in Java) that returns some token at login
success or throws an exception at login failure.
Here's some of my code.
Login component:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { AuthenticationService } from '../_services/index';
@Component({
moduleId: module.id,
templateUrl: 'login.component.html'
})
export class LoginComponent implements OnInit {
model: any = {};
error = '';
constructor(
private router: Router,
private authenticationService: AuthenticationService) { }
ngOnInit() {
// reset login status
this.authenticationService.logout();
}
login() {
this.authenticationService.login(this.model.username,
this.model.password)
.subscribe(result => {
if (result === true) {
this.router.navigate(['/']);
} else {
this.error = 'Login failed!';
}
},
err => {
this.error = 'Login failed!';
});
}
}
Authentication service:
import { Injectable } from '@angular/core';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import { Observable } from 'rxjs';
import { CookieService } from 'angular2-cookie/core';
import { CookieOptionsArgs } from
'angular2-cookie/services/cookie-options-args.model';
import 'rxjs/add/operator/map';
@Injectable()
export class AuthenticationService {
public token: string;
constructor(private http: Http, private cookieService: CookieService) {
// set token if saved in cookie
this.token = cookieService.get('token');
}
login(username, password): Observable<boolean> {
return this.http.post('http://localhost:9081/MyApp/login?username='
+ username + '&password=' + password, new RequestOptions({}))
.map((response: Response) => {
// login successful if there's a token in the response
let token = response.text();
if (token !== '-1') {
// set token
this.token = token;
// store token in cookie to keep user logged
let opts: CookieOptionsArgs = {
path: '/'
};
this.cookieService.put('token', token, opts);
// return true to indicate successful login
return true;
} else {
// return false to indicate failed login
return false;
}
});
}
logout(): void {
// clear token, remove cookie to log user out
this.token= null;
this.cookieService.remove('token');
}
}
Everything works as expected. When login is successful, token is returned
and I'm redirected to a "home" page. Otherwise, a "Login falied" message
appears on a login page and no redirection occurs. What bothers me is that
I don't exactly know why login fails: is it because username doesn't exist
or is it maybe because password is wrong. What is the proper way to handle
exceptions thrown by REST service? I assume that authentication service is
the right place but I don't exactly know how to do it. I tried to extract
some info from request object but request mapping doesn't happen if
exception is thrown.
Thanks for help!
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