package com.atlassian.johnson.filters;
   
   import com.atlassian.johnson.JohnsonEventContainer;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import javax.servlet.http.HttpServletResponse;
   import javax.servlet.http.HttpServletRequest;
   import java.io.IOException;
  
  /**
   * Handles error cases with XmlRpc fault responses for an application that is unable to handle normal requests.
   */
  public class JohnsonXmlRpcFilter extends AbstractJohnsonFilter {
  
      // NOTE: there is no clear definition of what this fault code should be, http://www.xmlrpc.com/spec
      // it seems that Axis is using 0 so we will also :)
      public static final int FAULT_CODE = 0;
  
      private static final Logger LOG = LoggerFactory.getLogger(JohnsonXmlRpcFilter.class);
  
      protected String buildXmlRpcErrorMessage(String error, int faultCode) {
          return "<?xml version=\"1.0\"?>\n" +
                  "<methodResponse>\n" +
                  "    <fault>\n" +
                  "        <value>\n" +
                  "            <struct>\n" +
                  "                <member>\n" +
                  "                    <name>faultString</name>\n" +
                  "                    <value>" +
                  error +
                  "</value>\n" +
                  "                </member>\n" +
                  "                <member>\n" +
                  "                    <name>faultCode</name>\n" +
                  "                    <value>\n" +
                  "                        <int>" +
                  faultCode +
                  "</int>\n" +
                  "                    </value>\n" +
                  "                </member>\n" +
                  "            </struct>\n" +
                  "        </value>\n" +
                  "    </fault>\n" +
                  "</methodResponse>";
      }
  
      protected void handleError(JohnsonEventContainer appEventContainer, HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws IOException {
          LOG.info("The application is unavailable, or there are errors.  Returning a SOAP fault with the event message.");
          servletResponse.setContentType(TEXT_XML_UTF8_CONTENT_TYPE);
          String message = getStringForEvents(appEventContainer.getEvents());
          servletResponse.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
          servletResponse.getWriter().write(buildXmlRpcErrorMessage(message, FAULT_CODE));
      }
  
      protected void handleNotSetup(HttpServletRequest servletRequest, HttpServletResponse servletResponse) throws IOException {
          LOG.info("The application is not setup.  Returning a SOAP fault with a 'not setup' message.");
          servletResponse.setContentType(TEXT_XML_UTF8_CONTENT_TYPE);
          String message = "The application has not yet been setup.";
          servletResponse.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
          servletResponse.getWriter().write(buildXmlRpcErrorMessage(message, FAULT_CODE));
      }
  }