ShiroUserRealm

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.LockedAccountException;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.UnknownAccountException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import com.db.sys.dao.SysMenuDao;
import com.db.sys.dao.SysRoleMenuDao;
import com.db.sys.dao.SysUserDao;
import com.db.sys.dao.SysUserRoleDao;
import com.db.sys.entity.SysUser;
@Service
public class ShiroUserRealm extends AuthorizingRealm {
    @Autowired
    private SysUserDao sysUserDao;
    @Autowired
    private SysUserRoleDao sysUserRoleDao;
    @Autowired
    private SysRoleMenuDao sysRoleMenuDao;
    @Autowired
    private SysMenuDao sysMenuDao;
    /**
     * 设置凭证匹配器
     */
    @Override
    public void setCredentialsMatcher(CredentialsMatcher credentialsMatcher) {
        //构建凭证匹配对象
        HashedCredentialsMatcher cMatcher=new HashedCredentialsMatcher();
        //设置加密算法
        cMatcher.setHashAlgorithmName("MD5");
        //设置加密次数
        cMatcher.setHashIterations(1);
        super.setCredentialsMatcher(cMatcher);
    }
    /**
     * 通过此方法完成认证数据的获取及封装,系统
     * 底层会将认证数据传递认证管理器，由认证
     * 管理器完成认证操作。
     */
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) 
            throws AuthenticationException {
        //1.获取用户名(用户页面输入)
        UsernamePasswordToken upToken=
        (UsernamePasswordToken)token;
        String username=upToken.getUsername();
        //2.基于用户名查询用户信息
        SysUser user=
        sysUserDao.findUserByUserName(username);
        //3.判定用户是否存在
        if(user==null)
        throw new UnknownAccountException();
        //4.判定用户是否已被禁用。
        if(user.getValid()==0)
        throw new LockedAccountException();
        //5.封装用户信息
        ByteSource credentialsSalt=
        ByteSource.Util.bytes(user.getSalt());
        //记住：构建什么对象要看方法的返回值
        SimpleAuthenticationInfo info=
        new SimpleAuthenticationInfo(
                user,//principal (身份)
                user.getPassword(),//hashedCredentials
                credentialsSalt, //credentialsSalt
                getName());//realName
        //6.返回封装结果
        return info;
    }
    /**通过此方法完成授权信息的获取及封装*/
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(
        PrincipalCollection principals) {
        //1.获取登录用户信息，例如用户id
        SysUser user=(SysUser)principals.getPrimaryPrincipal();
        Integer userId=user.getId();
        //2.基于用户id获取用户拥有的角色(sys_user_roles)
        List<Integer> roleIds=
        sysUserRoleDao.findRoleIdsByUserId(userId);
        if(roleIds==null||roleIds.size()==0)
        throw new AuthorizationException();
        //3.基于角色id获取菜单id(sys_role_menus)
        Integer[] array={};
        List<Integer> menuIds=
        sysRoleMenuDao.findMenuIdsByRoleIds(
                roleIds.toArray(array));
        if(menuIds==null||menuIds.size()==0)
        throw new AuthorizationException();
        //4.基于菜单id获取权限标识(sys_menus)
        List<String> permissions=
        sysMenuDao.findPermissions(
            menuIds.toArray(array));
        //5.对权限标识信息进行封装并返回
        Set<String> set=new HashSet<>();
        for(String per:permissions){
            if(!StringUtils.isEmpty(per)){
                set.add(per);
            }
        }
        SimpleAuthorizationInfo info=
        new SimpleAuthorizationInfo();
        info.setStringPermissions(set);
        return info;//返回给授权管理器
    }
}