<%@page session="false"%>
<%@page import="java.util.Set"%>
<%@page import="java.util.Map"%>
<%@page import="java.util.HashMap"%>
<%@page import="java.util.Iterator"%>
<%@page import="java.net.*,java.io.*"%>
<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
	try {
		
		// 한글인코딩
		request.setCharacterEncoding("UTF-8");

		//GET방식에서 key, value를 url에 넣는 과정
		Map paramMap = request.getParameterMap();
		Iterator iterator = paramMap.keySet().iterator();
		
		// post, get에서 쓸 url을 각각 지정
		String reqUrl = ((String[])paramMap.get("url"))[0];
		
		if(reqUrl.indexOf("?") == -1){
			reqUrl = reqUrl + "?";
		} else {
			if (reqUrl.charAt(reqUrl.length()-1) != '?') {
				reqUrl += "&";
			}
		}

		//get에서 knv를 url에 담는 과정
		String middleUrl = "";
		while (iterator.hasNext()) {
			
			String key = (String) iterator.next();
			
			if (key.equalsIgnoreCase("url")) {
				continue;
			}
			
			String values[] = (String[]) paramMap.get(key);

			if (values[0] != null) {
				middleUrl = middleUrl + key.toUpperCase() + "=" + URLEncoder.encode(values[0], "UTF-8") + "&";
			}
			
			// System.out.println("key : " + key + " ___ value : " + values[0]);
			
		}
		
		String resultUrl = reqUrl + middleUrl;
	
		URL url = null;
		HttpURLConnection con = null;
				
		if (request.getMethod().equalsIgnoreCase("GET")) {
			
			url = new URL(resultUrl);
			//System.out.println("request : (" + request.getMethod() + ") "+ resultUrl);
			
			con = (HttpURLConnection) url.openConnection();
			con.setDoOutput(true);
			con.setRequestMethod(request.getMethod());
			int clength = request.getContentLength();
			if (clength > 0) {
				con.setDoInput(true);
				InputStream istream = request.getInputStream();
				OutputStream os = con.getOutputStream();
				final int length = 5000;
				byte[] bytes = new byte[length];
				int bytesRead = 0;
				while ((bytesRead = istream.read(bytes, 0, length)) > 0) {
					os.write(bytes, 0, bytesRead);
				}
			}
			
		} else {
			
			url = new URL(reqUrl);
			//System.out.println("request : (" + request.getMethod() + ") "+ reqUrl);
			
			// POST방식에서 inputStream을 StringBuilder에 붙임
			StringBuilder sb = new StringBuilder();
			InputStreamReader is = new InputStreamReader(request.getInputStream());
			BufferedReader br = new BufferedReader(is);
			String read = br.readLine();
		
			while (read != null) {
				sb.append(read);	
				read = br.readLine();
			}
			
			String strBody = sb.toString();
			System.out.println("before body : " + strBody);
			
			con = (HttpURLConnection) url.openConnection();
			con.setRequestMethod(request.getMethod());
			con.setRequestProperty("charset", "UTF-8");
			con.setDoOutput(true);
			con.setUseCaches(false);
			
			if (strBody.trim().startsWith("<")) {
				// XML of Post Method
				con.setRequestProperty("Content-Type", "application/xml");
			} else {
				// KVP of Post Method
				strBody = strBody + middleUrl;
				con.setRequestProperty("Content-Type", request.getContentType());
			}
			
			System.out.println("after body : " + strBody);
			// StringBuilder를 byte화 시켜서 post로 넘어온 데이터를 담는다
			byte[] postData = strBody.getBytes();
			con.setRequestProperty("Content-Length", Integer.toString(postData.length));
			con.getOutputStream().write(postData);
			
		}
		
		out.clear();
		out = pageContext.pushBody();
		OutputStream ostream = response.getOutputStream();
		response.setContentType(con.getContentType());
		 
		InputStream in = con.getInputStream();
		final int length = 5000;
		byte[] bytes = new byte[length];
		int bytesRead = 0;
		while ((bytesRead = in.read(bytes, 0, length)) > 0) {
			ostream.write(bytes, 0, bytesRead);
		}
		
	} catch (Exception e) {
		System.out.println("proxy exception : " + e);
		response.setStatus(500);
	}
%>