/*

  * Copyright 2007 The Kuali Foundation

  *

  * Licensed under the Educational Community License, Version 1.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  * http://www.opensource.org/licenses/ecl1.php

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.student.common.ui.client.security;

 import org.kuali.student.common.ui.client.application.Application;

 import org.kuali.student.common.ui.client.application.ApplicationContext;

 import org.kuali.student.common.ui.client.widgets.KSErrorDialog;

 import org.kuali.student.common.ui.client.widgets.KSLightBox;

 import com.google.gwt.event.dom.client.ClickEvent;

 import com.google.gwt.event.dom.client.ClickHandler;

 import com.google.gwt.http.client.Request;

 import com.google.gwt.http.client.RequestBuilder;

 import com.google.gwt.http.client.RequestCallback;

 import com.google.gwt.http.client.RequestException;

 import com.google.gwt.http.client.Response;

 import com.google.gwt.http.client.URL;

 import com.google.gwt.user.client.ui.Button;

 import com.google.gwt.user.client.ui.FlexTable;

 import com.google.gwt.user.client.ui.Label;

 import com.google.gwt.user.client.ui.PasswordTextBox;

 import com.google.gwt.user.client.ui.TextBox;

 import com.google.gwt.user.client.ui.VerticalPanel;

 /**

  * This implements the SessionTimeoutHandler. The timeout is handled by displaying a spring

  * security login panel.  

  * 

  * @author Kuali Student Team

  *

  */

 public class SpringSecurityLoginDialogHandler implements SessionTimeoutHandler{

         final static ApplicationContext context = Application.getApplicationContext();

         public final String TIMEOUT_MSG = "Your session has timed out. Please login again.";

         protected KSLightBox lightbox;

     protected TextBox username;

     protected PasswordTextBox password;

     protected Label errorLabel;

         @Override

         public void handleSessionTimeout() {

             if (lightbox == null){

                     createLoginPanel();

             } else {

                     resetLoginPanel();

             }

             lightbox.setSize(460, 220);

         lightbox.show();                

         }

         private void createLoginPanel(){

                 lightbox = new KSLightBox();

         VerticalPanel panel = new VerticalPanel();

         FlexTable table = new FlexTable();

         errorLabel = new Label();

         errorLabel.setText(TIMEOUT_MSG);

         errorLabel.setStyleName("KSError");

         username = new TextBox();

         username.setName("j_username");

         password = new PasswordTextBox();

         password.setName("j_password");

         table.setText(0, 0, "Username");

         table.setWidget(0, 1, username);

         table.setText(1,0, "Password");

         table.setWidget(1,1, password);

         table.setWidget(2,0,(new Button("Login", new ClickHandler() {   

             public void onClick(ClickEvent event) {

                 StringBuffer postData = new StringBuffer();

                 postData.append(URL.encode("j_username")).append("=").append(username.getText());

                 postData.append("&").append(URL.encode("j_password")).append("=").append(password.getText());

                 RequestBuilder builder = new RequestBuilder(RequestBuilder.POST, context.getApplicationContextUrl() + "/j_spring_security_check");

                 builder.setHeader("Content-type", "application/x-www-form-urlencoded");

                 try{

                     builder.sendRequest(postData.toString(), new RequestCallback(){

                         @Override

                         public void onError(Request req, Throwable caught) {

                                 lightbox.hide();

                                 KSErrorDialog.show(caught);

                         }

                         @Override

                         public void onResponseReceived(Request req, Response res) {

                             if (res.getStatusCode() == Response.SC_OK && !res.getText().contains("Bad credentials")){

                                     lightbox.hide();

                             } else {

                                 errorLabel.setText("Your login attempt was not successful, try again.");

                             }

                         }});

                 } catch (RequestException e) {

                         KSErrorDialog.show(e);

                 }                

             }

         }

         )));

         panel.add(errorLabel);

         panel.add(table);

         panel.setStyleName("KSLoginPanel");

         lightbox.setWidget(panel);

     }

         private void resetLoginPanel(){

                 username.setText("");

                 password.setText("");

                 errorLabel.setText(TIMEOUT_MSG);                

         }

 }