added csrf tokens to the TestAuthentication

TestAuthenticationWithCSRF.java

package tips.cloudnative.testauthentication;

import org.apache.commons.codec.binary.Base64;
import org.springframework.http.HttpHeaders;

public class TestAuthentication {

    @Autowired
    private CsrfTokenRepository csrfTokenRepository;

    public HttpHeaders basicAuthHeaders() {
        String plainCreds = "user:password";
        byte[] plainCredsBytes = plainCreds.getBytes();
        byte[] base64CredsBytes = Base64.getEncoder().encode(plainCredsBytes);
        String base64Creds = new String(base64CredsBytes);

        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", "Basic " + base64Creds);
        return headers;
    }

    public HttpHeaders csrfHeaders() {
        CsrfToken csrfToken = csrfTokenRepository.generateToken(null);
        HttpHeaders headers = basicAuthHeaders();

        headers.add(csrfToken.getHeaderName(), csrfToken.getToken());
        headers.add("Cookie", "XSRF-TOKEN=" + csrfToken.getToken());

        return headers;
    }
}