/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache 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.apache.org/licenses/LICENSE-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.apache.shiro.samples.sprhib.security;

 import org.apache.shiro.authc.*;

 import org.apache.shiro.authc.credential.Sha256CredentialsMatcher;

 import org.apache.shiro.authz.AuthorizationInfo;

 import org.apache.shiro.authz.SimpleAuthorizationInfo;

 import org.apache.shiro.realm.AuthorizingRealm;

 import org.apache.shiro.samples.sprhib.dao.UserDAO;

 import org.apache.shiro.samples.sprhib.model.Role;

 import org.apache.shiro.samples.sprhib.model.User;

 import org.apache.shiro.subject.PrincipalCollection;

 import org.springframework.beans.factory.annotation.Autowired;

 import org.springframework.stereotype.Component;

 /**

  * The Spring/Hibernate sample application's one and only configured Apache Shiro Realm.

  *

  * <p>Because a Realm is really just a security-specific DAO, we could have just made Hibernate calls directly

  * in the implementation and named it a 'HibernateRealm' or something similar.</p>

  *

  * <p>But we've decided to make the calls to the database using a UserDAO, since a DAO would be used in other areas

  * of a 'real' application in addition to here. We felt it better to use that same DAO to show code re-use.</p>

  */

 @Component

 public class SampleRealm extends AuthorizingRealm {

     protected UserDAO userDAO = null;

     public SampleRealm() {

         setName("SampleRealm"); //This name must match the name in the User class's getPrincipals() method

         setCredentialsMatcher(new Sha256CredentialsMatcher());

     }

     @Autowired

     public void setUserDAO(UserDAO userDAO) {

         this.userDAO = userDAO;

     }

     protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authcToken) throws AuthenticationException {

         UsernamePasswordToken token = (UsernamePasswordToken) authcToken;

         User user = userDAO.findUser(token.getUsername());

         if( user != null ) {

             return new SimpleAuthenticationInfo(user.getId(), user.getPassword(), getName());

         } else {

             return null;

         }

     }

     protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {

         Long userId = (Long) principals.fromRealm(getName()).iterator().next();

         User user = userDAO.getUser(userId);

         if( user != null ) {

             SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();

             for( Role role : user.getRoles() ) {

                 info.addRole(role.getName());

                 info.addStringPermissions( role.getPermissions() );

             }

             return info;

         } else {

             return null;

         }

     }

 }