package cn.wisenergy.chnmuseum.party.auth;

import cn.wisenergy.chnmuseum.party.model.PermissionInit;
import cn.wisenergy.chnmuseum.party.service.PermissionInitService;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.filter.mgt.DefaultFilterChainManager;
import org.apache.shiro.web.filter.mgt.PathMatchingFilterChainResolver;
import org.apache.shiro.web.servlet.AbstractShiroFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * 热加载链接权限
 */
@Service
public class ShiroService {

	@Autowired
	private ShiroFilterFactoryBean shiroFilterFactoryBean;

	@Autowired
	private PermissionInitService permissionInitService;

	/**
	 * 初始化权限
	 */
	public Map<String, String> loadFilterChainDefinitions() {
		// 权限控制map.从数据库获取
		Map<String, String> filterChainDefinitionMap = new LinkedHashMap<String, String>();
		List<PermissionInit> list = this.permissionInitService.selectAll();

		for (PermissionInit permissionInit : list) {
			filterChainDefinitionMap.put(permissionInit.getUrl(), permissionInit.getPermissionInit());
		}
		return filterChainDefinitionMap;
	}

	/**
	 * 重新加载权限
	 */
	public void updatePermission() {
		synchronized (shiroFilterFactoryBean) {
			AbstractShiroFilter shiroFilter;
			try {
				shiroFilter = (AbstractShiroFilter) shiroFilterFactoryBean.getObject();
			} catch (Exception e) {
				throw new RuntimeException("get ShiroFilter from shiroFilterFactoryBean error!");
			}

			PathMatchingFilterChainResolver filterChainResolver = (PathMatchingFilterChainResolver) shiroFilter
					.getFilterChainResolver();
			DefaultFilterChainManager manager = (DefaultFilterChainManager) filterChainResolver.getFilterChainManager();

			// 清空老的权限控制
			manager.getFilterChains().clear();

			shiroFilterFactoryBean.getFilterChainDefinitionMap().clear();
			shiroFilterFactoryBean.setFilterChainDefinitionMap(loadFilterChainDefinitions());
			// 重新构建生成
			Map<String, String> chains = shiroFilterFactoryBean.getFilterChainDefinitionMap();
			for (Map.Entry<String, String> entry : chains.entrySet()) {
				String url = entry.getKey();
				String chainDefinition = entry.getValue().trim().replace(" ", "");
				manager.createChain(url, chainDefinition);
			}

			System.out.println("更新权限成功！！");
		}
	}

}