Angular HttpClient侦听器:刷新身份验证令牌

import { Injectable } from '@angular/core';
import { HttpClient, HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class TokenInterceptor implements HttpInterceptor {
  constructor(private http: HttpClient) {}

  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    // 检查令牌是否过期
    if (this.isTokenExpired()) {
      // 获取新的令牌
      const newToken = this.getNewToken();

      // 将新的令牌添加到请求标头中
      request = request.clone({
        setHeaders: {
          Authorization: `Bearer ${newToken}`
        }
      });
    }

    return next.handle(request);
  }

  private isTokenExpired(): boolean {
    // 检查令牌是否过期的逻辑
    // 返回true或false
  }

  private getNewToken(): string {
    // 获取新的令牌的逻辑
    // 返回新的令牌字符串
  }
}

import { NgModule } from '@angular/core';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';
import { TokenInterceptor } from './token.interceptor';

@NgModule({
  imports: [HttpClientModule],
  providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: TokenInterceptor,
      multi: true
    }
  ]
})
export class AppModule { }