Setting Authorization header in Angular 2

Question

I am working on restful services in spring and I have implemented Json Web Token (JWT) for authentication and authorization. After login proper authentication token is returned to the requesting user. On every request I am checking the token in request header and validating the token. Code for filter is below.

@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
        throws ServletException, IOException {
    String authToken = request.getHeader(this.tokenHeader);
    System.out.println(authToken + "        ##########################");
    String username = flTokenUtil.getUsernameFromToken(authToken);
    if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
        UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
        if (flTokenUtil.validateToken(authToken, userDetails)) {
            UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                    userDetails, null, userDetails.getAuthorities());
            authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
            SecurityContextHolder.getContext().setAuthentication(authentication);
        }
    }

    chain.doFilter(request, response);

}

And I am using angular 2 as frontend framework. Now when after getting authentication token I request for a secured resource using " POSTMAN " it works perfectly and token is received in the filter and all goes well. I am setting token in "Authorization" header. Now the problem is when I do the same thing using angular 2 token is going null in the filter but firebug shows that "Authorization" header is set and send successfully. I am doing this

    let token = "";
    if (undefined != this._tokenService.getToken()) {
        token = this._tokenService.getToken().getToken()
    }
    let header: Headers = new Headers();
    header.append('Content-Type', 'application/json');
    header.append('Authorization', token);
    let options = new RequestOptions({headers: header});

    return this.http.get(url, options)
       .map(res => {
          console.log(res.status)
          if (res.status == 200) {
              return res.json();
          } else if (res.status == 401) {
              return null;
          } else {
              throw new Error('This request has failed ' + res.status);
           }
        });

What I am doing wrong? What is the proper way to set header in angular 2. How can I solve this issue?

Answer 1

If you want a more permanent solution I've got one for you.

By subclassing angular's http service you can inject the subclassed version and you then always get the headers added.

import {
  Http,
  ConnectionBackend,
  Headers,
  Request,
  RequestOptions,
  RequestOptionsArgs,
  Response,
  RequestMethod,
} from '@angular/http';
import { Observable } from 'rxjs/Observable';
import { ErrorObservable } from 'rxjs/observable/ErrorObservable';

// A service that can get the logged in users jwt token as an observable
import { SecurityService } from './security.service';

// A service that handles cookies (angular2-cookie)
import { CookieService } from '../cookie';

/**
 * Custom Http client that handles conversions to json, adds CSRF token, and jwt token and redirects to signin if token is missing
 */
export class SecureHttp extends Http {

  constructor(
    backend: ConnectionBackend,
    defaultOptions: RequestOptions,
    private securityService: SecurityService,
    private cookieService: CookieService
  ) {
    super(backend, defaultOptions);
  }

  request(url: string | Request, options?: RequestOptionsArgs): Observable<any> {
    if (typeof url === 'string') {
      return this.get(url, options); // Recursion: transform url from String to Request
    }

    return this.sendRequest(url, options);
  }

  get(url: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Get, url: url, body: '' }, options);
  }

  post(url: string, body: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Post, url: url, body: body }, options);
  }

  put(url: string, body: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Put, url: url, body: body }, options);
  }

  delete(url: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Delete, url: url, body: '' }, options);
  }

  patch(url: string, body: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Patch, url: url, body: body }, options);
  }

  head(url: string, options?: RequestOptionsArgs): Observable<any> {
    return this.sendRequest({ method: RequestMethod.Head, url: url, body: '' }, options);
  }

  private sendRequest(requestOptionsArgs: RequestOptionsArgs, options?: RequestOptionsArgs): Observable<any> {

    let requestOptions = new RequestOptions(requestOptionsArgs);

    // Convert body to stringified json if it's not a string already
    if (typeof requestOptions.body !== 'string') {
      requestOptions.body = JSON.stringify(requestOptions.body);
    }

    // Get xsrf token from spring security cookie
    // by adding .csrf().csrfTokenRepository(CookieCsrfTokenRepository.withHttpOnlyFalse())
    const csrfToken: string = this.cookieService.get('XSRF-TOKEN');

    let baseOptions: RequestOptions = new RequestOptions({
      headers: new Headers({
        'Content-Type': 'application/json',
        'X-Requested-With': 'XMLHttpRequest',
        'X-XSRF-TOKEN': csrfToken
      })
    });

    return this.securityService.accessToken$.mergeMap(token => {

      // If there is a token we add it to the baseOptions
      if (token) {
        baseOptions.headers.set('Authorization', 'Bearer ' + token);
      }

      // We create a request from the passed in method, url, body and merge our base options in there
      let request = new Request(baseOptions.merge(requestOptions));

      return super.request(request, options)
        .map(res => res.json())
        .catch(this.errorHandler);
    });
  }

  private errorHandler(errorResponse: Response): Observable<any> | ErrorObservable {
    if (errorResponse.status === 401) {
      console.log('redirecting to login');
      window.location.href = '/login';
      return Observable.empty();
    }

    // If it's a serious problem we can log it to a service if we want to
    if (errorResponse.status === 500) {
      // this.errorReporter.logError(errorResponse);
    }

    console.error(errorResponse);

    return Observable.throw(errorResponse.text().length > 0 ? errorResponse.json() : { status: 'error' });
  }
}

Then in your module

export function secureHttpFactory(backend: XHRBackend, defaultOptions: RequestOptions, securityService: SecurityService, cookieService: CookieService) {
  return new SecureHttp(backend, defaultOptions, securityService, cookieService);
}

@NgModule({
  imports: [
    HttpModule,
    CookieModule,
    StorageModule,
  ],
  declarations: [
    ...DIRECTIVES,
    ...COMPONENTS,
  ],
  exports: [
    ...DIRECTIVES,
  ]
})
export class SecurityModule {

  // Only create on instance of these
  static forRoot(): ModuleWithProviders {
    return {
      ngModule: SecurityModule,
      providers: [
        SecurityService,
        {
          provide: SecureHttp,
          useFactory: secureHttpFactory,
          deps: [XHRBackend, RequestOptions, SecurityService, CookieService]
        }
      ]
    };
  }

}

Answer 2

Add Bearer to you auth header and the content type header also like:

headers.append("content-type", "application/x-www-form-urlencode");
 headers.append("Authorization", "Bearer " + this.accessToken);

Answer 3

I followed alternative approach for it. appends token in URL and in filter i am splitting this token and use it for authentication. Also use request wrapper class and send original URL for further action. https://www.ibm.com/support/knowledgecenter/en/SSEP7X_7.0.4/com.ibm.wmqfte.doc/web_admin_servlet_filters.htm