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package com.wsria.demo.filter;

import java.io.IOException;

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.HttpSession;

import org.jasig.cas.client.validation.Assertion;

import com.wsria.demo.entity.account.User;


/**
 * 自動根據單點登錄系統的信息設置本系統的用戶信息
 *
 * @author 咖啡兔
 * @site www.wsria.cn
 *
 */
public class AutoSetUserAdapterFilter implements Filter {

	/**
	 * Default constructor. 
	 */
	public AutoSetUserAdapterFilter() {
	}

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
	}

	/**
	 * 過濾邏輯：首先判斷單點登錄的賬戶是否已經存在本系統中，
	 * 如果不存在使用用戶查詢接口查詢出用戶對象並設置在Session中
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
			ServletException {
		HttpServletRequest httpRequest = (HttpServletRequest) request;
		System.out.println("###doFilter###");
		// _const_cas_assertion_是CAS中存放登錄用戶名的session標誌
		Object object = httpRequest.getSession().getAttribute("_const_cas_assertion_");

		if (object != null) {
			Assertion assertion = (Assertion) object;
			String loginName = assertion.getPrincipal().getName();

			HttpSession	session = ((HttpServletRequest)request).getSession();
			Object sessionUser = session.getAttribute("user");
			User user = null;
			if (sessionUser == null) {
				user = (User) sessionUser;
			} else {
				user = null;
			}

			// 第一次登錄系統
			if (user == null) {
				user = new User();
				user.setLoginName(loginName);
				// 保存用戶信息到Session
				session.setAttribute("user", user);
			}

		}
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
	}

}