/**
* Creates a model and view to transport the error message
*
* @param request the current HTTP request
* @param response the current HTTP response
* @param view the name of the view to use, can be null if the request should be handled as Ajax
* upload or there is no mapping for the request and the default non-ajax upload view should
* be used
* @return the created model and view or null if the response was written as JSON
*/
private ModelAndView prepareAjaxModelAndView(
HttpServletRequest request, HttpServletResponse response, String errorMessage) {
ObjectNode jsonResponse = JsonRequestHelper.createJsonErrorResponse(errorMessage);
try {
// Note: the JSON cannot be written directly to the response since this is not supported
// by exception resolvers. Main problem is that some headers like encoding won't be set
// correctly and response is written twice
return ControllerHelper.prepareModelAndViewForJsonResponse(
request, response, jsonResponse, false);
} catch (IOException e) {
// should not occur because response is not written directly
LOGGER.error("Unexpected exception handling MaxUploadSizeExceededException", e);
return null;
}
}
/**
* Implementation of the exception resolving method which will only handle the {@link
* MaxUploadSizeExceededException}.
*
* @param request the current HTTP request
* @param response the response
* @param handler the executed handler, which is null in case of an MaxUploadSizeExceededException
* @param ex the exception that got thrown
* @return the model and view or null if the exception is not a MaxUploadSizeExceededException or
* no view is defined
*/
@Override
public ModelAndView resolveException(
HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
if (ex instanceof MaxUploadSizeExceededException) {
String errorMessage =
MessageHelper.getText(
request,
"error.blogpost.upload.filesize.limit",
new Object[] {getHumanReadableUploadSizeLimit()});
String targetPath =
ClientUrlHelper.removeIds(request.getServletPath() + request.getPathInfo());
String view = null;
if (requestMappings != null) {
view = requestMappings.get(targetPath);
}
if (view != null) {
MessageHelper.saveErrorMessage(request, errorMessage);
MessageHelper.setMessageTarget(request, targetPath);
return new ModelAndView(ControllerHelper.replaceModuleInViewName(view));
}
return prepareAjaxModelAndView(request, response, errorMessage);
}
return null;
}