Enabling Cross-Site Request Forgery (CSRF) through Angular's HttpClientModule is causing an error message to appear: TS2552 -

Question

Enabling Cross-Site Request Forgery (CSRF) through Angular's HttpClientModule is causing an error message to appear: TS2552 -

As a novice in front-end development, I am looking to incorporate CSRF tokens into certain requests within a frontend application. The app is built using Angular version 12.2.17, and I am following the guidelines outlined in the Angular documentation: https://angular.io/api/common/http/HttpClientXsrfModule

To implement this, I have added the interceptor in my code as shown below:

import {HTTP_INTERCEPTORS, HttpClientModule, HttpClientXsrfModule  } from "@angular/common/http";


imports: [
        ...
        HttpClientXsrfModule
    ],
providers: [
         ...
        { provide: HTTP_INTERCEPTORS, useExisting: HttpXsrfInterceptor, multi: true }
    ],

However, upon adding the "HttpXsrfInterceptor" line, I encountered an error tooltip in IntelliJ:

TS2552: Cannot find name HttpXsrfInterceptor . Did you mean HTTP_INTERCEPTORS ?

What adjustments do I need to make to properly configure the HttpXsrfInterceptor?

What I have tried:

As an attempt to solve the issue, I modified the imports line to include:

import {HTTP_INTERCEPTORS, HttpClientModule, HttpClientXsrfModule, HttpXsrfInterceptor } from "@angular/common/http";

This change, however, resulted in another error message related to the mentioned line:

TS2724: "@angular/common/http" has no exported member named HttpXsrfInterceptor . Did you mean HTTP_INTERCEPTORS ?

angular typescript csrf angular-http-interceptors csrf-token

Answer 1

Answer №1

Success! After much trial and error, the code finally compiled successfully:

import {CustomHttpInterceptor} from "./custompath/myinterceptor";
...

 providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: CustomHttpInterceptor,
      multi: true
    }
  ]

The CustomHttpInterceptor is a unique interceptor implementation shown below:

@Injectable()
export class CustomHttpInterceptor implements HttpInterceptor {

  constructor( 
    private tokenExtractor: HttpXsrfTokenExtractor
  ) {}

  intercept(req: HttpRequest<any>, next: HttpHandler):

    Observable<HttpEvent<any>> {
      console.log("custom interceptor active");
      const cookieheaderName = 'X-CSRF-TOKEN';
      let csrfToken = this.tokenExtractor.getToken() as string;
      console.log("custom csrfToken: " + csrfToken);
      if (csrfToken !== null && !req.headers.has(cookieheaderName)) {
          console.log("custom cloning request with CSRF token: " + csrfToken);
          req = req.clone({ headers: req.headers.set(cookieheaderName, csrfToken) });
      }
      console.log("custom returning request's handling");

    return next.handle(req);
  }
}

Answer 2

Success! After much trial and error, the code finally compiled successfully:

import {CustomHttpInterceptor} from "./custompath/myinterceptor";
...

 providers: [
    {
      provide: HTTP_INTERCEPTORS,
      useClass: CustomHttpInterceptor,
      multi: true
    }
  ]

The CustomHttpInterceptor is a unique interceptor implementation shown below:

@Injectable()
export class CustomHttpInterceptor implements HttpInterceptor {

  constructor( 
    private tokenExtractor: HttpXsrfTokenExtractor
  ) {}

  intercept(req: HttpRequest<any>, next: HttpHandler):

    Observable<HttpEvent<any>> {
      console.log("custom interceptor active");
      const cookieheaderName = 'X-CSRF-TOKEN';
      let csrfToken = this.tokenExtractor.getToken() as string;
      console.log("custom csrfToken: " + csrfToken);
      if (csrfToken !== null && !req.headers.has(cookieheaderName)) {
          console.log("custom cloning request with CSRF token: " + csrfToken);
          req = req.clone({ headers: req.headers.set(cookieheaderName, csrfToken) });
      }
      console.log("custom returning request's handling");

    return next.handle(req);
  }
}

Enabling Cross-Site Request Forgery (CSRF) through Angular's HttpClientModule is causing an error message to appear: TS2552 -

Answer №1

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