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import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Router } from '@angular/router';
import { Observable, of, throwError, BehaviorSubject } from 'rxjs';
import { map, catchError, retry } from 'rxjs/operators';
import { nullIfUndefined } from '../../utilities/language-untilities';
import { AlreadyLoginError, BadCredentialsError, BadNetworkError, UnknownError } from './errors';
import {
createTokenUrl, validateTokenUrl, CreateTokenRequest,
CreateTokenResponse, ValidateTokenRequest, ValidateTokenResponse
} from './http-entities';
import { UserCredentials, UserInfo } from '../entities';
export type UserLoginState = 'nologin' | 'invalidlogin' | 'success';
/**
* 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) { }
userRouteNavigate(commands: any[] | null) {
this.router.navigate([{
outlets: {
user: commands
}
}]);
}
refreshAndGetUserState(): Observable<UserLoginState> {
if (this.token === undefined || this.token === null) {
return of(<UserLoginState>'nologin');
}
return this.httpClient.post<ValidateTokenResponse>(validateTokenUrl, <ValidateTokenRequest>{ token: this.token }).pipe(
retry(3),
catchError(error => {
console.error('Failed to validate token.');
return throwError(error);
}),
map(result => {
if (result.isValid) {
this.userInfoSubject.next(nullIfUndefined(result.userInfo));
return <UserLoginState>'success';
} else {
this.token = null;
this.userInfoSubject.next(null);
return <UserLoginState>'invalidlogin';
}
})
);
}
tryLogin(credentials: UserCredentials): 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;
this.userInfoSubject.next(result.userInfo);
return result.userInfo;
})
);
}
}
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