package org.nutz.mvc;
import java.io.IOException;
import java.util.regex.Pattern;
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 org.nutz.lang.Strings;
import org.nutz.lang.util.Context;
import org.nutz.mvc.config.FilterNutConfig;
/**
* 同 JSP/Serlvet 容器的挂接点
*
* @author zozoh(zozohtnt@gmail.com)
* @author juqkai(juqkai@gmail.com)
* @author wendal(wendal1985@gmail.com)
*/
public class NutFilter implements Filter {
protected ActionHandler handler;
private static final String IGNORE = "^.+\\.(jsp|png|gif|jpg|js|css|jspx|jpeg|swf|ico)$";
private Pattern ignorePtn;
private String selfName;
private SessionProvider sp;
private NutFilter2 proxyFilter;//代理老版本的Filter
public void init(FilterConfig conf) throws ServletException {
if ("true".equals(Strings.sNull(conf.getInitParameter("skip-mode"), "false").toLowerCase())) {
proxyFilter = new NutFilter2();
return;
}
Mvcs.setServletContext(conf.getServletContext());
this.selfName = conf.getFilterName();
Mvcs.set(selfName, null, null);
FilterNutConfig config = new FilterNutConfig(conf);
Mvcs.setNutConfig(config);
handler = new ActionHandler(config);
String regx = Strings.sNull(config.getInitParameter("ignore"), IGNORE);
if (!"null".equalsIgnoreCase(regx)) {
ignorePtn = Pattern.compile(regx, Pattern.CASE_INSENSITIVE);
}
sp = config.getSessionProvider();
}
public void destroy() {
if (proxyFilter != null)
return;
Mvcs.resetALL();
Mvcs.set(selfName, null, null);
if (handler != null)
handler.depose();
Mvcs.setServletContext(null);
Mvcs.close();
}
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
throws IOException, ServletException {
if (proxyFilter != null) {
proxyFilter.doFilter(req, resp, chain);
return;
}
String preName = Mvcs.getName();
Context preContext = Mvcs.resetALL();
HttpServletRequest request = (HttpServletRequest)req;
HttpServletResponse response = (HttpServletResponse)resp;
try {
if (sp != null)
req = sp.filter(request,
response,
Mvcs.getServletContext());
Mvcs.set(this.selfName, request, response);
RequestPath path = Mvcs.getRequestPathObject(request);
if (null == ignorePtn || !ignorePtn.matcher(path.getUrl()).find()) {
if (handler.handle(request, response))
return;
}
// 更新 Request 必要的属性
Mvcs.updateRequestAttributes((HttpServletRequest) req);
// 本过滤器没有找到入口函数，继续其他的过滤器
chain.doFilter(req, resp);
}
finally {
Mvcs.resetALL();
//仅当forward/incule时,才需要恢复之前设置
if (null != (request.getAttribute("javax.servlet.forward.request_uri"))) {
if (preName != null)
Mvcs.set(preName, request, response);
if (preContext != null)
Mvcs.ctx.reqThreadLocal.set(preContext);
}
}
}
}