/**

  * 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.security.spring;

 import java.util.ArrayList;

 import org.kuali.rice.core.config.Config;

 import org.kuali.rice.core.config.ConfigContext;

 import org.kuali.rice.kim.bo.entity.dto.KimPrincipalInfo;

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

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

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

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

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

 import org.springframework.security.GrantedAuthority;

 import org.springframework.security.userdetails.UserDetails;

 import org.springframework.security.userdetails.UserDetailsService;

 import org.springframework.security.userdetails.UsernameNotFoundException;

 import org.springframework.security.util.AuthorityUtils;

 import org.springframework.util.StringUtils;

 /**

  * This is a description of what this class does - Rich don't forget to fill this in. 

  * 

  * @author Kuali Student Team

  *

  */

 public class KSDefaultUserDetailsService implements UserDetailsService{

     protected boolean enabled = true;

     protected boolean nonlocked = true;

     protected Config config = null;

     protected IdentityService identityService = null; // This is added so we can get the correct principal ID

     protected RoleService roleService = null;  // needed for future client overrides.

         public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {

         String password;

         if(username==null || username.equals("")){

             throw new UsernameNotFoundException("Username cannot be null or empty");

         }

         // This is for the dummy KS Login

         password = username;        

         KimPrincipalInfo kimPrincipalInfo = null;

         kimPrincipalInfo = identityService.getPrincipalByPrincipalName(username);                

         String userId;

         if (null != kimPrincipalInfo) {

             username = kimPrincipalInfo.getPrincipalName();

             userId = kimPrincipalInfo.getPrincipalId();

         } else {

         // When a UsernameNotFoundException is thrown, spring security will proceed to the next AuthenticationProvider on the list.

         // When Rice is running and username is not found in KIM, we want authentication to stop and allow the user to enter the correct username.

         // to do this we need to throw a AccountStatusException and not UsernameNotFoundException.

             //System.out.println("kimPrincipalInfo is null ");

             throw new KimUserNotFoundException("Invalid username or password");  

         }

         UserWithId ksuser = new UserWithId(username, password, enabled, true, true, nonlocked, getGrantedAuthority(userId));

         ksuser.setUserId(userId);                     

         return ksuser;

     }

     protected GrantedAuthority[] getGrantedAuthority(String principalId){

             String springRoles = "";

             // KS Administrator

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

              KimRoleInfo adminRole = roleService.getRoleByName(StudentIdentityConstants.KS_NAMESPACE_CD, StudentIdentityConstants.KSCM_ADMIN_ROLE_NAME);

             if(adminRole != null) {

                     adminRoleIdList.add(adminRole.getRoleId());

             }

             // KS User

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

         KimRoleInfo ksUserRole = roleService.getRoleByName(StudentIdentityConstants.KS_NAMESPACE_CD, StudentIdentityConstants.KSCM_USER_ROLE_NAME);

         if(ksUserRole != null) {

                 ksUserRoleIdList.add(ksUserRole.getRoleId());

         }            

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

         if(roleService.principalHasRole(principalId, adminRoleIdList, null)){

                 ksSpringRolesList.add("ROLE_KS_ADMIN");

         }

         if(roleService.principalHasRole(principalId, ksUserRoleIdList, null)){

                 ksSpringRolesList.add("ROLE_KS_USER");

         }  

         // Enable backdoor login. The LUMMain.jsp has will actually display the login. 

         if (enableBackdoorLogin()) {

                 ksSpringRolesList.add("ROLE_KS_BACKDOOR");

         }

         springRoles = StringUtils.collectionToCommaDelimitedString(ksSpringRolesList);

         return AuthorityUtils.commaSeparatedStringToAuthorityArray(springRoles);                

     }

     public Config getConfig() {

             if(this.config == null){

                     this.config = ConfigContext.getCurrentContextConfig();

             }

                 return config;

         }

         public void setConfig(Config config) {

                 this.config = config;

         }

          public void setIdentityService(IdentityService identityService) {

                 this.identityService = identityService;

          }

          protected boolean enableBackdoorLogin() {

              return "true".equalsIgnoreCase(getConfig().getProperty("enableKSBackdoorLogin"));

          }

          public RoleService getRoleService() {            

                  return roleService;

          }

         public void setRoleService(RoleService roleService) {

                 this.roleService = roleService;

         }

         public IdentityService getIdentityService() {

                 return identityService;

         }

 }