mean-guide-frontend/src/app/auth/auth-interceptor.ts

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import { HttpInterceptor, HttpRequest, HttpHandler } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { AuthService } from './auth.service';

@Injectable()
export class AuthInterceptor implements HttpInterceptor{
  constructor(private authService: AuthService){}
  intercept(req: HttpRequest<any>, next: HttpHandler){
    const token = this.authService.getToken()
    const authRequest = req.clone({
      headers: req.headers.set('Authorization', `Bearer ${token}`)
    })
    return next.handle(authRequest)
  }
}