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import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Router } from '@angular/router';
import { Observable, throwError, BehaviorSubject, of } from 'rxjs';
import { map, catchError, retry, switchMap, tap } from 'rxjs/operators';
import { AlreadyLoginError, BadCredentialsError, BadNetworkError, UnknownError } from './errors';
import {
createTokenUrl, validateTokenUrl, CreateTokenRequest,
CreateTokenResponse, ValidateTokenRequest, ValidateTokenResponse
} from './http-entities';
import { UserCredentials, UserInfo } from '../entities';
import { MatSnackBar } from '@angular/material';
/**
* This service is only used internal in user module.
*/
@Injectable({
providedIn: 'root'
})
export class InternalUserService {
private token: string | null = null;
private userInfoSubject = new BehaviorSubject<UserInfo | null>(null);
get currentUserInfo(): UserInfo | null {
return this.userInfoSubject.value;
}
get userInfo$(): Observable<UserInfo | null> {
return this.userInfoSubject;
}
constructor(private httpClient: HttpClient, private router: Router, private snackBar: MatSnackBar) {
const savedToken = window.localStorage.getItem('token');
if (savedToken === null) {
setTimeout(() => snackBar.open('No login before!', 'ok', { duration: 2000 }), 0);
} else {
this.validateToken(savedToken).subscribe(result => {
if (result === null) {
window.localStorage.removeItem('token');
setTimeout(() => snackBar.open('Last login is no longer invalid!', 'ok', { duration: 2000 }), 0);
} else {
this.token = savedToken;
this.userInfoSubject.next(result);
setTimeout(() => snackBar.open('You have login already!', 'ok', { duration: 2000 }), 0);
}
}, _ => {
setTimeout(() => snackBar.open('Failed to check last login', 'ok', { duration: 2000 }), 0);
});
}
}
private validateToken(token: string): Observable<UserInfo | null> {
return this.httpClient.post<ValidateTokenResponse>(validateTokenUrl, <ValidateTokenRequest>{ token: token }).pipe(
retry(3),
switchMap(result => {
if (result.isValid) {
const { userInfo } = result;
if (userInfo) {
return of(userInfo);
} else {
return throwError(new Error('Wrong server response. IsValid is true but UserInfo is null.'));
}
} else {
return of(null);
}
}),
tap({
error: error => {
console.error('Failed to validate token.');
console.error(error);
}
}),
);
}
userRouteNavigate(commands: any[] | null) {
this.router.navigate([{
outlets: {
user: commands
}
}]);
}
tryLogin(credentials: UserCredentials, options: { remember: boolean } = { remember: true }): Observable<UserInfo> {
if (this.token) {
return throwError(new AlreadyLoginError());
}
return this.httpClient.post<CreateTokenResponse>(createTokenUrl, <CreateTokenRequest>credentials).pipe(
catchError((error: HttpErrorResponse) => {
if (error.error instanceof ErrorEvent) {
console.error('An error occurred when login: ' + error.error.message);
return throwError(new BadNetworkError());
} else if (error.status === 400) {
console.error('An error occurred when login: wrong credentials.');
return throwError(new BadCredentialsError());
} else {
console.error('An unknown error occurred when login: ' + error);
return throwError(new UnknownError(error));
}
}),
map(result => {
this.token = result.token;
if (options.remember) {
window.localStorage.setItem('token', result.token);
}
this.userInfoSubject.next(result.userInfo);
return result.userInfo;
})
);
}
}
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