package com.yhcms.manage.admin.biz;

import java.io.IOException;

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

import org.apache.log4j.Logger;

import com.yhcms.manage.admin.bean.AdminUser;

/**
 * <p>Title:系統(tǒng)管理過濾器</p>
 * <li>用來檢查在用戶在執(zhí)行操作系統(tǒng)后臺(tái)時(shí),session是否失效.</li>
 * <li>如果用戶沒有登錄或者session失效,則跳轉(zhuǎn)到登錄界面.</li>
 * <br><b>CopyRight: yyhweb[由由華網(wǎng)]</b>
 * @author stephen
 * @version YH-2.0
 */
public class AdminFilter implements Filter {
	
	protected FilterConfig filterConfig;
	
	public void destroy() {
		filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		
		// 從session取得當(dāng)前用戶
		HttpSession session = ((HttpServletRequest) request).getSession();
		AdminUser curUser = (AdminUser) session.getAttribute("yhcmsuser");
		if (curUser == null) {
			Logger yhlog = Logger.getLogger(AdminFilter.class.getName());
			yhlog.info("Admin user session invalidate!");
			RequestDispatcher rd = request.getRequestDispatcher("/admin/Login.html");
			rd.forward(request, response);
			return;
		}
		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;		
	}
}