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import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Observable, of, throwError } from 'rxjs';
import { map, catchError, retry } from 'rxjs/operators';
import { UserInfo } from '../user-info';
export interface UserCredentials {
username: string;
password: string;
}
export interface CreateTokenResult {
token: string;
userInfo: UserInfo;
}
export interface TokenValidationRequest {
token: string;
}
export interface TokenValidationResult {
isValid: boolean;
userInfo?: UserInfo;
}
export interface UserLoginState {
state: 'nologin' | 'invalidlogin' | 'success';
userInfo?: UserInfo;
}
export class BadNetworkException extends Error {
constructor() {
super('Network is bad.');
}
}
export class AlreadyLoginException extends Error {
constructor() {
super('There is already a token saved. Please call validateUserLoginState first.');
}
}
export class BadCredentialsException extends Error {
constructor() {
super(`Username or password is wrong.`);
}
}
@Injectable({
providedIn: 'root'
})
export class UserService {
private token: string;
private userInfo: UserInfo;
constructor(private httpClient: HttpClient) { }
validateUserLoginState(): Observable<UserLoginState> {
if (this.token === undefined || this.token === null) {
return of(<UserLoginState>{ state: 'nologin' });
}
return this.httpClient.post<TokenValidationResult>('/api/User/ValidateToken', <TokenValidationRequest>{ token: this.token }).pipe(
retry(3),
catchError(error => {
console.error('Failed to validate token.');
return throwError(error);
}),
map(result => {
if (result.isValid) {
this.userInfo = result.userInfo;
return <UserLoginState>{
state: 'success',
userInfo: result.userInfo
};
} else {
this.token = null;
this.userInfo = null;
return <UserLoginState>{
state: 'invalidlogin'
};
}
})
);
}
tryLogin(username: string, password: string): Observable<UserInfo> {
if (this.token) {
return throwError(new AlreadyLoginException());
}
return this.httpClient.post<CreateTokenResult>('/api/User/CreateToken', <UserCredentials>{
username, password
}).pipe(
catchError((error: HttpErrorResponse) => {
if (error.error instanceof ErrorEvent) {
console.error('An error occurred when login: ' + error.error.message);
return throwError(new BadNetworkException());
} else if (error.status === 400) {
console.error('An error occurred when login: wrong credentials.');
return throwError(new BadCredentialsException());
} else {
console.error('An unknown error occurred when login: ' + error);
return throwError(error);
}
}),
map(result => {
this.token = result.token;
this.userInfo = result.userInfo;
return result.userInfo;
})
);
}
}
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