package org.bremersee.exception;
   
   import org.springframework.http.HttpStatus;
   import org.springframework.security.core.AuthenticationException;
   import org.springframework.util.StringUtils;
   
   /**
    * The access token retriever authentication exception.
    *
   * @author Christian Bremer
   */
  public class AccessTokenRetrieverAuthenticationException extends AuthenticationException
      implements HttpStatusAware {
  
    private final HttpStatus httpStatus;
  
    /**
     * Instantiates a new access token retriever authentication exception.
     *
     * @param httpStatus the http status
     * @param body the body
     */
    public AccessTokenRetrieverAuthenticationException(
        final HttpStatus httpStatus, final String body) {
      super(buildMessage(httpStatus, body));
      this.httpStatus = httpStatus;
    }
  
    @Override
    public int status() {
      return httpStatus != null ? httpStatus.value() : HttpStatus.UNAUTHORIZED.value();
    }
  
    private static String buildMessage(final HttpStatus httpStatus, final String body) {
      if ((httpStatus == null || !StringUtils.hasText(httpStatus.getReasonPhrase()))
          && !StringUtils.hasText(body)) {
        return RestApiExceptionUtils.NO_MESSAGE_VALUE;
      }
      if (httpStatus == null) {
        return body;
      }
      final StringBuilder sb = new StringBuilder();
      sb.append("Server returned status code ").append(httpStatus.value());
      if (StringUtils.hasText(httpStatus.getReasonPhrase())) {
        sb.append(" (").append(httpStatus.getReasonPhrase()).append(")");
      }
      if (StringUtils.hasText(body)) {
        sb.append(": ").append(body);
      }
      return sb.toString();
    }
  }