alfresco-ng2-components/demo-shell-ng2/app/services/authentication.ts

import {Injectable} from "angular2/core";
import {Observable} from 'rxjs/Rx';

@Injectable()
export class Authentication {
    token: string;

    constructor() {
        this.token = localStorage.getItem('token');
    }

    isLoggedIn() {
        return !!localStorage.getItem('token');
    }

    login(username: String, password: String) {
        if (username === 'test' && password === 'test') {
            this.token = 'token';
            localStorage.setItem('token', this.token);
            return Observable.of('token');
        }

        return Observable.throw('authentication failure');
    }

    logout() {
        this.token = undefined;
        localStorage.removeItem('token');

        return Observable.of(true);
    }
}