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authentication.service.ts
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Mon, Feb 24, 06:35

authentication.service.ts
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import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import { map } from 'rxjs/operators/map';
import { Router } from '@angular/router';
export interface UserDetails {
_id: string;
email: string;
name: string;
exp: number;
iat: number;
}
interface TokenResponse {
token: string;
}
export interface TokenPayload {
email: string;
password: string;
name?: string;
}
@Injectable()
export class AuthenticationService {
private token: string;
constructor(private http: HttpClient, private router: Router) {}
private saveToken(token: string): void {
localStorage.setItem('mean-token', token);
this.token = token;
}
private getToken(): string {
if (!this.token) {
this.token = localStorage.getItem('mean-token');
}
return this.token;
}
public getUserDetails(): UserDetails {
const token = this.getToken();
let payload;
if (token) {
payload = token.split('.')[1];
payload = window.atob(payload);
return JSON.parse(payload);
} else {
return null;
}
}
public isLoggedIn(): boolean {
const user = this.getUserDetails();
if (user) {
return user.exp > Date.now() / 1000;
} else {
return false;
}
}
private request(method: 'post'|'get', type: 'login'|'register'|'profile', user?: TokenPayload): Observable<any> {
let base;
if (method === 'post') {
base = this.http.post(`/api/${type}`, user);
} else {
base = this.http.get(`/api/${type}`, { headers: { Authorization: `Bearer ${this.getToken()}` }});
}
const request = base.pipe(
map((data: TokenResponse) => {
if (data.token) {
this.saveToken(data.token);
}
return data;
})
);
return request;
}
public register(user: TokenPayload): Observable<any> {
return this.request('post', 'register', user);
}
public login(user: TokenPayload): Observable<any> {
return this.request('post', 'login', user);
}
public profile(): Observable<any> {
return this.request('get', 'profile');
}
public logout(): void {
this.token = '';
window.localStorage.removeItem('mean-token');
this.router.navigateByUrl('/');
}
}

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