package com.yihu.base.filters;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang3.StringUtils;
import com.yihu.base.SessionBean;

/**
 * 权限过滤
 * 
 * @author Administrator
 * 
 */
public class SecurityFilter implements Filter {
	private List<String> excludeList;//不做过滤的地址
	public void destroy() {

	}

	/**
	 * 过滤器
	 */
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
		throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		HttpSession session = request.getSession(true);
		chain.doFilter(req, res);
//		String loginPath ="/ApmWeb/app/appLogin.html";
//		String path = request.getServletPath();
//		path = path.substring(1, path.length());
//		if(excludeList.contains(path)||( path.indexOf('?')<0&&(path.endsWith(".css")||path.endsWith(".js")||path.endsWith(".png")||path.endsWith(".jpg")||path.endsWith(".gif")))){
//			chain.doFilter(req, res);
//			return;
//		}
//		try {
//			
//			
//			if (request.getSession().getAttribute("apmUser") == null) {
//				String requestType = request.getHeader("X-Requested-With");  
//				//response.sendRedirect("login.html");
//				if (!StringUtils.isEmpty(requestType) && requestType.equalsIgnoreCase("XMLHttpRequest")) { 
//	                response.setStatus(911);  
//	                response.setHeader("sessionstatus", "timeout");  
//	                response.addHeader("loginPath", loginPath);  
//	                return;  
//	            } else {
//	            	response.sendRedirect(loginPath);
//	                return;  
//	            }
//			}else {
//				chain.doFilter(req, res);
//				
//			}
//		} catch (Exception e) {
//			e.printStackTrace();
//		}
	}

	public void init(FilterConfig config) throws ServletException {
		excludeList = new ArrayList<String>();
		String excludeStr = config.getInitParameter("exclude");
		String[] arr = excludeStr.split(",");
		for(String str:arr){
			excludeList.add(str.trim());
		}
		
	}

	public static void main(String[] args) {
		String str = "/abd/aa.jspss"; // /abc/abc2/abc.shtml
		List<String> list = new ArrayList();
		list.add("在在在");
		list.add("/abc/*.shtml");
		list.add("/*.jsp");
		list.add("/ab/*");
		list.add("/login.jsp");
		list.add("/dd/*.jsp");
		//System.out.println(isFilterUrl(str, list));
	}

	/**
	 * 过滤URL地址 支持: /* : 所有目录 /*.jsp,/*.do : 根目录,以指定后辍名结尾的 /ab/*.do , /ab/* : 某个目录下有所有指定后辍名结尾的 *.jsp,*.do : 过滤指定后辍名结尾的
	 * 
	 * @param servletPath
	 *            URL地址
	 * @return 返回是否过滤
	 */
	public static boolean isFilterUrl(String servletPath, List<String> list) {
		servletPath = servletPath.toLowerCase().trim(); // 转成小写的
		StringBuffer startStr; // * 号前面的字符串
		StringBuffer endStr; // * 号后面的字符串
		StringBuffer middleStr; // 对访问路径去除*号前后的字符串
		for (String filterUrl : list) {
			filterUrl = filterUrl.toLowerCase().trim();
			if (filterUrl.equals("/*")) { // 如果是有 /* 则所有都通过
				return true;
			}
			if (filterUrl.equalsIgnoreCase(servletPath)) { // 如果访问路径与列表中的一致,返回正确
				return true;
			}
			if (filterUrl.indexOf("*.") == 0) { // 如果是 "*." 号在前面,后面是后辍名的 例如:
												// *.js ,*.jsp,*.do
				if (servletPath.endsWith(filterUrl.substring(1)))
					return true;
			}
			if (filterUrl.indexOf("*") >= 1) { // 在有 "*" 号的情况下
				startStr = new StringBuffer(filterUrl.substring(0, filterUrl.indexOf("*")));
				endStr = new StringBuffer(filterUrl.substring(filterUrl.indexOf("*") + 1, filterUrl.length()));
				if (servletPath.startsWith(startStr.toString()) && servletPath.endsWith(endStr.toString())) {
					middleStr = new StringBuffer(servletPath.substring(startStr.length(),
							servletPath.length() - endStr.length()));
					if (middleStr.indexOf("/") == -1) {
						return true;
					}
				}
			}
		}
		return false;
	}
	
		
}