/**
 * Copyright (c) 2015-2017, Chill Zhuang 庄骞 (smallchill@163.com).
 * <p>
 * Licensed 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.dsh.guns.config;

import com.dsh.guns.core.support.HttpKit;
import com.dsh.guns.modular.system.model.User;
import com.dsh.guns.modular.system.util.CacheUtil;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.List;

public class UserExt {
    private static final String NAMES_DELIMETER = ",";

    /**
     * 获取当前 Subject
     *
     * @return Subject
     */
    public static User getUser() {
        HttpServletRequest request = HttpKit.getRequest();
        HttpSession session = request.getSession();
        Object obj = session.getAttribute("user");
        if(null == obj){
            return null;
        }
        User user = (User) obj;
        return user;
    }


    public static Integer getLanguage(){
        HttpServletRequest request = HttpKit.getRequest();
        HttpSession session = request.getSession();
        Object obj = session.getAttribute("language");
        if(null == obj){
            return null;
        }
        return (Integer)obj;
    }

    /**
     * 验证当前用户是否拥有指定权限,使用时与lacksPermission 搭配使用
     *
     * @param permission 权限名
     * @return 拥有权限：true，否则false
     */
    public boolean hasPermission(String permission) {
        if(getUser() != null && permission != null && permission.length() > 0){
            User user = getUser();
            List<String> menuNodes = CacheUtil.menus.get(user.getAccount());
            return menuNodes.contains(permission);
        }
        return false;
    }

    /**
     * 与hasPermission标签逻辑相反，当前用户没有制定权限时，验证通过。
     *
     * @param permission 权限名
     * @return 拥有权限：true，否则false
     */
    public boolean lacksPermission(String permission) {
        return !hasPermission(permission);
    }



}