[英]How to show an alert or toaster message when the JWT token expires in Angular 7
当 JWT 令牌过期时,Web 应用程序应显示alert
或模式弹出窗口,然后应重定向到登录页面。 目前我正在使用烤面包机消息。
我的组件中有很多 api 调用。 我收到许多烤面包机消息“令牌已过期”。 我应该只显示一条消息并重定向到登录页面。 告诉我你的好主意。 我在互联网上有一些文章。 但我无法清楚地了解这些东西。
import {
HttpEvent,
HttpInterceptor,
HttpHandler,
HttpRequest,
HttpResponse,
HttpErrorResponse
} from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { retry, catchError } from 'rxjs/operators';
import { Router } from '@angular/router';
import { ToastrManager } from 'ng6-toastr-notifications';
import { Injectable } from '@angular/core';
import { JwtDecoderService } from './jwt-decoder.service';
@Injectable()
export class HttpErrorInterceptor implements HttpInterceptor {
constructor(public router: Router,
public toastr: ToastrManager,
private jwtDecoder: JwtDecoderService, ) {
}
intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
if (localStorage.getItem('isLoggedin') === 'false' && !this.jwtDecoder.isTokenExpired()) {
this.toastr.warningToastr('Token expired');
return;
}
return next.handle(request)
.pipe(
catchError((error: HttpErrorResponse) => {
let errorMessage = '';
if (error.error instanceof ErrorEvent) {
// client-side error
errorMessage = `Error: ${error.error.message}`;
} else {
// server-side error
errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;
if (error.status === 404) {
this.toastr.warningToastr('Server Not Found');
this.router.navigate(['/login']);
}
if (error.status === 412) {
this.toastr.warningToastr('Token expired');
this.router.navigate(['/login']);
}
// if (error.status === 500 || error.status === 400) {
// this.toastr.errorToastr('We encountered a technical issue');
// }
}
// return throwError(errorMessage);
return throwError(error);
})
);
}
}
您可以使用HttpInterceptor 。 由于每个 API 调用都通过拦截器,您可以检查令牌是否仍然有效,继续 API 调用
如果令牌过期,则显示 toastr 警报并阻止任何进一步的 API 调用。
有关使用拦截器的更多信息,请访问使用拦截器和Angular 7 JWT 拦截器的10 种方法
完整代码:
http-interceptor.service.ts
import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent, HttpResponse } from '@angular/common/http';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';
import { SessionService } from './session.service';
import { Router } from '@angular/router';
import { throwError } from 'rxjs';
declare var toastr;
@Injectable({
providedIn: 'root'
})
export class HttpInterceptorService implements HttpInterceptor {
constructor(private router: Router, private sessionService: SessionService) { }
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
var token = this.sessionService.getToken();
if (token != null && this.sessionService.isTokenExpired()) {
this.sessionService.logOut()
toastr.warning("Session Timed Out! Please Login");
this.router.navigate(['/login'])
return throwError("Session Timed Out")
} else {
const authRquest = req.clone({
setHeaders: {
Authorization: 'Bearer ' + token
}
})
return next.handle(authRquest)
.pipe(
tap(event => {
}, error => {
})
)
}
}
}
app.module.ts
providers: [
{
provide: HTTP_INTERCEPTORS,
useClass: HttpInterceptorService,
multi: true
}
]
会话服务.ts
getToken(): string {
return localStorage.getItem('userToken');
}
getTokenExpirationDate(token: string): Date {
token = this.getToken()
const decoded = jwt_decode(token);
if (decoded.exp === undefined) return null;
const date = new Date(0);
date.setUTCSeconds(decoded.exp);
return date;
}
isTokenExpired(token?: string): boolean {
if (!token) token = this.getToken();
if (!token) return true;
const date = this.getTokenExpirationDate(token);
if (date === undefined) return false;
return !(date.valueOf() > new Date().valueOf());
}
logOut(loginType?: string) {
localStorage.removeItem('isLoggedin');
localStorage.removeItem('userRole');
}
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