--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/luan/LuanExitException.java	Thu Feb 28 09:47:38 2013 +0000
@@ -0,0 +1,4 @@
+package luan;
+
+
+public final class LuanExitException extends RuntimeException {}

--- a/src/luan/lib/HttpLib.java	Wed Feb 27 23:50:32 2013 +0000
+++ b/src/luan/lib/HttpLib.java	Thu Feb 28 09:47:38 2013 +0000
@@ -5,7 +5,9 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.Arrays;
+import java.util.Enumeration;
 import javax.servlet.ServletOutputStream;
+import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import luan.LuanState;
@@ -13,6 +15,8 @@
 import luan.LuanElement;
 import luan.LuanException;
 import luan.LuanTable;
+import luan.LuanJavaFunction;
+import luan.LuanExitException;
 
 
 public final class HttpLib {
@@ -36,28 +40,179 @@
 
 		LuanTable module = (LuanTable)luan.loaded().get(NAME);
 
-		LuanTable parameters = new LuanTable();
-		LuanTable parameter_lists = new LuanTable();
-		@SuppressWarnings("unchecked")
-		Map<String,String[]> paramMap = request.getParameterMap();
-		for( Map.Entry<String,String[]> entry : paramMap.entrySet() ) {
-			String name = entry.getKey();
-			String[] values = entry.getValue();
-			parameters.put(name,values[0]);
-			parameter_lists.put( name, new LuanTable(Arrays.asList((Object[])values)) );
+		try {
+			new HttpLib(request,response,module);
+		} catch(NoSuchMethodException e) {
+			throw new RuntimeException(e);
 		}
-		module.put("parameters",parameters);
-		module.put("parameter_lists",parameter_lists);
 
 		luan.JAVA.call(fn,FN_NAME);
 	}
-/*
+
 	private final HttpServletRequest request;
 	private final HttpServletResponse response;
 
-	private HttpLib(HttpServletRequest request,HttpServletResponse response) {
+	private HttpLib(HttpServletRequest request,HttpServletResponse response,LuanTable module) throws NoSuchMethodException {
 		this.request = request;
 		this.response = response;
+
+		LuanTable req = new LuanTable();
+		module.put("request",req);
+		LuanTable resp = new LuanTable();
+		module.put("response",resp);
+
+		req.put( "get_parameter", new LuanJavaFunction(HttpServletRequest.class.getMethod("getParameter",String.class),request) );
+		req.put( "get_parameter_values", new LuanJavaFunction(HttpServletRequest.class.getMethod("getParameterValues",String.class),request) );
+		req.put( "get_header", new LuanJavaFunction(HttpServletRequest.class.getMethod("getHeader",String.class),request) );
+		add( req, "get_cookie_value", String.class );
+		req.put( "method", new LuanJavaFunction(HttpServletRequest.class.getMethod("getMethod"),request) );
+		req.put( "servlet_path", new LuanJavaFunction(HttpServletRequest.class.getMethod("getServletPath"),request) );
+		req.put( "server_name", new LuanJavaFunction(HttpServletRequest.class.getMethod("getServerName"),request) );
+		add( req, "current_url" );
+		req.put( "remote_address", new LuanJavaFunction(HttpServletRequest.class.getMethod("getRemoteAddr"),request) );
+
+		add( resp, "send_redirect", String.class );
+		add( resp, "send_error", Integer.TYPE, String.class );
+		resp.put( "set_header", new LuanJavaFunction(HttpServletResponse.class.getMethod("setHeader",String.class,String.class),response) );
+		add( resp, "set_cookie", String.class, String.class, Boolean.TYPE, String.class );
+		add( resp, "remove_cookie", String.class, String.class );
 	}
-*/
+
+	private void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
+		t.put( method, new LuanJavaFunction(HttpLib.class.getMethod(method,parameterTypes),this) );
+	}
+
+	public String get_cookie_value(String name) {
+		return getCookieValue(request, name);
+	}
+
+	public String current_url() {
+		return getCurrentURL(request);
+	}
+
+	public void send_redirect(String redirectUrl)
+		throws IOException
+	{
+		response.sendRedirect(redirectUrl);
+		throw new LuanExitException();
+	}
+
+	public void send_error(int code,String text)
+		throws IOException
+	{
+		response.sendError(code, text);
+		throw new LuanExitException();
+	}
+
+	public void set_cookie(String name,String value,boolean isPersistent, String domain) {
+		setCookie(request,response,name,value,isPersistent,domain);
+	}
+
+	public void remove_cookie(String name, String domain) {
+		removeCookie(request,response,name,domain);
+	}
+
+
+	// static utils
+
+	public static String getQueryString(HttpServletRequest request) {
+		return getQueryString(request,0);
+	}
+
+	public static String getQueryString(HttpServletRequest request,int maxValueLen) {
+		String method = request.getMethod();
+		if( method.equals("GET") )
+			return request.getQueryString();
+		if( !method.equals("POST") && !method.equals("HEAD") )
+			throw new RuntimeException(method);
+		Enumeration en = request.getParameterNames();
+		StringBuilder queryBuf = new StringBuilder();
+		if( !en.hasMoreElements() )
+			return null;
+		do {
+			String param = (String)en.nextElement();
+			String value = request.getParameter(param);
+			if( maxValueLen > 0 ) {
+				int len = value.length();
+				if( len > maxValueLen )
+					value = value.substring(0,maxValueLen) + "..." + (len-maxValueLen);
+			}
+			queryBuf.append(param);
+			queryBuf.append('=');
+			queryBuf.append(value);
+			queryBuf.append('&');
+		} while( en.hasMoreElements() );
+		queryBuf.deleteCharAt(queryBuf.length() - 1);
+		return queryBuf.toString();
+	}
+
+	public static String getCurrentURL(HttpServletRequest request) {
+		return getCurrentURL(request,0);
+	}
+
+	public static String getCurrentURL(HttpServletRequest request,int maxValueLen) {
+//		StringBuffer buf = HttpUtils.getRequestURL(request);
+		StringBuffer buf = request.getRequestURL();
+		String qStr = getQueryString(request,maxValueLen);
+		if(qStr != null && qStr.length() > 0) {
+			buf.append('?');
+			buf.append(qStr);
+		}
+		return buf.toString();
+	}
+
+	private static String escape(String value) {
+		return value.replaceAll(";", "%3B");
+	}
+
+	private static String unescape(String value) {
+		return value.replaceAll("%3B", ";");
+	}
+
+	private static Cookie getCookie(HttpServletRequest request,String name) {
+		Cookie[] cookies = request.getCookies();
+		if( cookies == null )
+			return null;
+		for (Cookie cookie : cookies) {
+			if (cookie.getName().equals(name))
+				return cookie;
+		}
+		return null;
+	}
+
+	public static String getCookieValue(HttpServletRequest request,String name) {
+		Cookie cookie = getCookie(request,name);
+		return cookie==null ? null : unescape(cookie.getValue());
+	}
+
+	public static void setCookie(HttpServletRequest request,HttpServletResponse response,String name,String value,boolean isPersistent, String domain) {
+		Cookie cookie = getCookie(request,name);
+		if( cookie==null || !cookie.getValue().equals(value) ) {
+			cookie = new Cookie(name, escape(value));
+			cookie.setPath("/");
+			if (domain != null && domain.length() > 0)
+				cookie.setDomain(domain);
+			if( isPersistent )
+				cookie.setMaxAge(10000000);
+			response.addCookie(cookie);
+		}
+	}
+
+	public static void removeCookie(HttpServletRequest request,
+									HttpServletResponse response,
+									String name,
+									String domain
+
+	) {
+		Cookie cookie = getCookie(request, name);
+		if(cookie != null) {
+			Cookie delCookie = new Cookie(name, "delete");
+			delCookie.setPath("/");
+			delCookie.setMaxAge(0);
+			if (domain != null && domain.length() > 0)
+				delCookie.setDomain(domain);
+			response.addCookie(delCookie);
+		}
+	}
+
 }