/**

  * Copyright 2010 The Kuali Foundation Licensed under the

  * Educational Community License, Version 2.0 (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.osedu.org/licenses/ECL-2.0

  *

  * 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.server.gwt;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import org.apache.log4j.Logger;

 import org.kuali.rice.kim.bo.role.dto.KimPermissionInfo;

 import org.kuali.rice.kim.bo.types.dto.AttributeSet;

 import org.kuali.rice.kim.service.IdentityManagementService;

 import org.kuali.student.common.rice.StudentIdentityConstants;

 import org.kuali.student.common.rice.authorization.PermissionType;

 import org.kuali.student.common.ui.client.service.SecurityRpcService;

 import org.kuali.student.common.ui.client.service.exceptions.OperationFailedException;

 import org.kuali.student.common.util.security.SecurityUtils;

 import com.google.gwt.user.server.rpc.RemoteServiceServlet;

 /**

  * This provides security RPC services to the GWT Application.  It should be noted that this

  * does not provide true client authorization as these calls can be easily manipulated by the

  * end user.  These calls are to be used to solely hide application components for

  * users which are not privileged to view them and the check is merely for visual display.

  * 

  * The real security checks are performed via security checks on the data RPC get/save

  * operations as well as masking/hiding of data returned to the browser.

  * 

  * @author Kuali Student Team

  *

  */

 public class SecurityRpcGwtServlet extends RemoteServiceServlet implements SecurityRpcService{

         final Logger LOG = Logger.getLogger(SecurityRpcGwtServlet.class);

         private static final long serialVersionUID = 1L;

         private IdentityManagementService permissionService;

         @Override

     public String getPrincipalUsername(){

             return SecurityUtils.getCurrentPrincipalName();

     }

         @Override

         public HashMap<String, Boolean> getScreenPermissions(ArrayList<String> screens) {

                 // TODO Auto-generated method stub

                 return null;

         }

         @Override

         public HashMap<String, Boolean> getPermissions(ArrayList<String> permissionNames) throws OperationFailedException{

                 String principalId = SecurityUtils.getCurrentPrincipalId();

                 LOG.debug("Retreiving permissions for permission name: " + permissionNames + " for " + principalId);

                 //FIXME: Is there a way to retrieve multiple permissions at once instead of calling isAuthorized multiple times?

                 HashMap<String,Boolean> permissions = new HashMap<String,Boolean>();

                 for (String permissionName:permissionNames){

                         boolean hasAccess = getPermissionService().isAuthorized(principalId, "KS-SYS", permissionName, null, null);

                         permissions.put(permissionName, hasAccess);

                 }

                 return permissions;

         }

         @Override

         public Boolean hasScreenPermission(String screenName) throws OperationFailedException {

                 String principalId = SecurityUtils.getCurrentPrincipalId();

                 LOG.debug("Retreiving screen permission " + screenName + " for " + principalId);                

         AttributeSet permDetails = new AttributeSet();

         permDetails.put(StudentIdentityConstants.SCREEN_COMPONENT, screenName);

         boolean hasAccess = false;

         hasAccess = getPermissionService().isAuthorizedByTemplateName(principalId, 

                                         PermissionType.USE_SCREEN.getPermissionNamespace(), 

                                         PermissionType.USE_SCREEN.getPermissionTemplateName(), permDetails, 

                                         permDetails);

         LOG.debug(principalId + " access : " + hasAccess);

                 return hasAccess;

         }

         @Override

         public Boolean hasPermissionByPermissionName(String permissionName)        throws OperationFailedException {                

                 String principalId = SecurityUtils.getCurrentPrincipalId();

                 LOG.debug("Retreiving permissions for permission name: " + permissionName + " for " + principalId);

                 //TODO: Do we need to worry about permission details when checking by permission name

                 boolean hasAccess = false;

                 hasAccess = getPermissionService().isAuthorized(principalId, "KS-SYS", permissionName, null, null);

                 LOG.debug(principalId + " access : " + hasAccess);

                 return hasAccess;

         }

         /**

          * This will return all permissions assigned to this user.

          * 

          * TODO: Need to determine if permission details are required.   

          */

         @SuppressWarnings("unchecked")

         @Override

         public ArrayList<String> getPermissionsByType(PermissionType permissionType) throws OperationFailedException {

                 ArrayList<String> matchingPermissions = new ArrayList<String>();

                 String principalId = SecurityUtils.getCurrentPrincipalId();

                 LOG.debug("Retreiving permissions for template: " + permissionType.getPermissionTemplateName() + " for " + principalId);

                 List<KimPermissionInfo> permissions = (List<KimPermissionInfo>)getPermissionService().getAuthorizedPermissionsByTemplateName(

                                 principalId, permissionType.getPermissionNamespace(), permissionType.getPermissionTemplateName(), null, null);

                 for (KimPermissionInfo permissionInfo:permissions){

                         matchingPermissions.add(permissionInfo.getName());

                 }

                 return matchingPermissions;

         }

         public void setPermissionService(IdentityManagementService permissionService) {

                 this.permissionService = permissionService;

         }

         public IdentityManagementService getPermissionService()throws OperationFailedException{

                 if(permissionService==null){

                 throw new OperationFailedException("Permission Service is unavailable");

         }

                 return permissionService;

         }

 }