/*
    * 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;
          }
      }
  
  }