package org.apereo.cas.web;
import org.apache.commons.lang3.StringEscapeUtils;
import org.apereo.cas.CasProtocolConstants;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.AbstractController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
/**
* Delegating controller.
* Tries to find a controller among its delegates, that can handle the current request.
* If none is found, an error is generated.
*
* @author Frederic Esnault
* @since 3.5
*/
public class DelegatingController extends AbstractController {
/**
* View if Service Ticket Validation Fails.
*/
private static final String DEFAULT_ERROR_VIEW_NAME = "casServiceFailureView";
private List<AbstractDelegateController> delegates;
/**
* The view to redirect if no delegate can handle the request.
*/
private String failureView = DEFAULT_ERROR_VIEW_NAME;
/**
* Handles the request.
* Ask all delegates if they can handle the current request.
* The first to answer true is elected as the delegate that will process the request.
* If no controller answers true, we redirect to the error page.
*
* @param request the request to handle
* @param response the response to write to
* @return the model and view object
* @throws Exception if an error occurs during request handling
*/
@Override
protected ModelAndView handleRequestInternal(final HttpServletRequest request, final HttpServletResponse response) throws Exception {
for (final AbstractDelegateController delegate : this.delegates) {
if (delegate.canHandle(request, response)) {
return delegate.handleRequestInternal(request, response);
}
}
return generateErrorView(CasProtocolConstants.ERROR_CODE_INVALID_REQUEST, null);
}
/**
* Generate error view based on {@link #setFailureView(String)}.
*
* @param code the code
* @param args the args
* @return the model and view
*/
private ModelAndView generateErrorView(final String code, final Object[] args) {
final ModelAndView modelAndView = new ModelAndView(this.failureView);
final String convertedDescription = getMessageSourceAccessor().getMessage(code, args, code);
modelAndView.addObject("code", StringEscapeUtils.escapeHtml4(code));
modelAndView.addObject("description", StringEscapeUtils.escapeHtml4(convertedDescription));
return modelAndView;
}
/**
* @param delegates the delegate controllers to set
*/
public void setDelegates(final List<AbstractDelegateController> delegates) {
this.delegates = delegates;
}
/**
* @param failureView The failureView to set.
*/
public void setFailureView(final String failureView) {
this.failureView = failureView;
}
}