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REST with authentication [message #1842526]

Tue, 22 June 2021 08:56

Faruk Caglar

Messages: 33
Registered: August 2019

Member

Hi,

within our scout application (scout 11) we need to use an external REST service with authentication (HTTP Basic Auth) . The technical documentation says, that the client helper class is used to specify the URL as well as additional properties used to build up the connection (like authentication). But we haven't found how to support the credentials within the class.

I would appreciate any suggestion. Thanks

[Updated on: Tue, 22 June 2021 09:07]

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Re: REST with authentication [message #1842527 is a reply to message #1842526]

Tue, 22 June 2021 09:23

Paolo Bazzi

Messages: 33
Registered: January 2017
Location: Switzerland

Member

Faruk Caglar wrote on Tue, 22 June 2021 08:56

Hi,
within our scout application (scout 11) we need to use an external REST service with authentication (HTTP Basic Auth) . The technical documentation says, that the client helper class is used to specify the URL as well as additional properties used to build up the connection (like authentication). But we haven't found how to support the credentials within the class.

You need to add a request filter within your client helper:

  @Override
  protected List<ClientRequestFilter> getRequestFiltersToRegister() {
    List<ClientRequestFilter> filters = super.getRequestFiltersToRegister();
    filters.add(BEANS.get(MyAuthenticationClientRequestFilter.class));
    return filters;
  }

Which may be implemented like this:

@Bean
public class MyAuthenticationClientRequestFilter implements ClientRequestFilter {

  public static final String HTTP_BASIC_AUTH_NAME = "Basic";
  public static final Charset HTTP_BASIC_AUTH_CHARSET = StandardCharsets.ISO_8859_1;

  @Override
  public void filter(ClientRequestContext requestContext) throws IOException {
    if (requestContext.getHeaders().get(HttpHeaders.AUTHORIZATION) != null) {
      return;
    }

    String authHeader = createBasicAuthHeader();
    if (authHeader == null) {
      return;
    }
    requestContext.getHeaders().putSingle(HttpHeaders.AUTHORIZATION, authHeader);
  }

  protected String createBasicAuthHeader() {
    String userpass =  // get by property / config / hardCode
    if (userpass == null) {
      return null;
    }
    return HTTP_BASIC_AUTH_NAME + " " + Base64Utility.encode(userpass.getBytes(HTTP_BASIC_AUTH_CHARSET));
  }
}

Regards,
Paolo

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