我的身份验证服务有问题。如果我在构造函数中发出 http 请求，它会被调用 259 次。如果我删除 http 调用，它会被调用一次。我使用共享模块来提供该服务的唯一实例。
角度版本：4.4.4
这是我的共享模块：
export const providers = [
AuthService,
DataStorageService,
];
@NgModule({
imports: [
CommonModule,
FormsModule,
HttpClientModule,
ReactiveFormsModule,
InfiniteScrollModule,
TruncateModule
],
declarations: [
FooterComponent,
PhotoListComponent,
GalleryListComponent,
],
exports: [
FooterComponent,
PhotoListComponent,
GalleryListComponent,
InfiniteScrollModule,
],
providers: [
]})
export class SharedModule {
static forRoot(): ModuleWithProviders {
return {
ngModule: SharedModule,
providers: [...providers]
};
}
}还有我的 AuthService：
@Injectable()
export class AuthService {
public session: Subject<SessionModel> = new Subject<SessionModel>();
private cachedSession: SessionModel = new SessionModel(null, null, false);
private apiUrl = 'http://localhost:8080/Galleo/user/login';
constructor(private cookieSrv: CookieService,
private http: HttpClient) {
console.log('constructor called');
if (this.cookieSrv.get('system-g-unx-data')) {
const cook = atob(this.cookieSrv.get('system-g-unx-data')).split('||');
const username = cook[0];
const password = cook[1];
this.login(username, password);
}
}
// login method, call REST API and store cookie into user Browser
login(username: string, password: string) {
const user: UserModel = new UserModel();
user.userName = username;
user.password = password;
const headers = new HttpHeaders();
headers.append('Content-Type', 'application/json');
this.http.post<UserModel>(this.apiUrl, user, {observe: 'response', headers: headers}).subscribe(
(response) => {
console.dir(response);
this.cachedSession.user = response.body;
this.cachedSession.token = response.headers.get('Authorization');
this.cachedSession.isAuthenticated = true;
this.session.next(this.cachedSession);
this.cookieSrv.put('system-g-unx-data', btoa(username + '||' + password));
},
(error) => {
console.dir(error);
this.session.next(null);
}
);
}
}谢谢！
编辑：我发现了问题。来自 AuthInterceptor。当我尝试获取授权令牌时，它会启动一个无限循环：
@Injectable()
export class AuthInterceptor implements HttpInterceptor {
private authService: AuthService;
constructor(private injector: Injector) {}
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
console.log('Intercepted!', req);
this.authService = this.injector.get(AuthService);
const request = req.clone({
setHeaders: {
Authorization: `${this.authService.getSession().token}`
}
});
return next.handle(request);
}
}现在如何在不使用注入器的情况下恢复 Interceptor 中的 authService？
最终编辑：我想出了如何从我的 authService 获取令牌而不进行无限循环。问题是我用来为每个请求添加令牌到授权标头的 HttpInterceptor。在我的 AuthService 构造函数中，我调用了发出 http 请求的登录方法.. LOOP: INTERCEPTOR => AUTH SERVICE => HTTP CLIENT 并再次 INTERCEPTOR
因此，现在我在拦截器中进行一些检查，例如：
Injectable()
export class AuthInterceptor implements HttpInterceptor {
private authService: AuthService;
constructor(private injector: Injector) { }
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// If login method called skip and continue request
if (req.url.includes('login')) {
return next.handle(req);
}
// If request don't have the Authorization Header, add the token to the header
if (!req.headers.has('Authorization')) {
this.authService = this.injector.get(AuthService);
const request = req.clone({
setHeaders: {
Authorization: `${this.authService.getSession().token}`
}
});
return next.handle(request);
}
return next.handle(req);
}也许可以帮助遇到同样问题的人。PS：喷油器需要在检查后调用
感谢帮助！