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package com.mxgraph.online;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation ExportProxyServlet
*/
@SuppressWarnings("serial")
public class ExportProxyServlet extends HttpServlet
{
private final String[] supportedServices = {"EXPORT_URL", "PLANTUML_URL", "VSD_CONVERT_URL", "EMF_CONVERT_URL"};
private void doRequest(String method, HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
try
{
int serviceId = 0;
String proxyPath = "";
String queryString = "";
try
{
if (request.getQueryString() != null)
{
queryString = "?" + request.getQueryString();
}
if (request.getPathInfo() != null) // /{serviceId}/*
{
String[] pathParts = request.getPathInfo().split("/");
if (pathParts.length > 1)
{
serviceId = Integer.parseInt(pathParts[1]);
}
if (pathParts.length > 2)
{
proxyPath = String.join("/", Arrays.copyOfRange(pathParts, 2, pathParts.length));
}
if (serviceId < 0 || serviceId > supportedServices.length)
{
serviceId = 0;
}
}
}
catch (Exception e)
{
// Ignore and use 0
serviceId = 0;
}
String exportUrl = System.getenv(supportedServices[serviceId]);
if (exportUrl == null || exportUrl.isEmpty())
{
throw new Exception(supportedServices[serviceId] + " not set");
}
URL url = new URL(exportUrl + proxyPath + queryString);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod(method);
//Copy request headers to export server
Enumeration<String> headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements())
{
String headerName = headerNames.nextElement();
Enumeration<String> headers = request.getHeaders(headerName);
while (headers.hasMoreElements())
{
String headerValue = headers.nextElement();
con.addRequestProperty(headerName, headerValue);
}
}
if ("POST".equals(method))
{
// Send post request
con.setDoOutput(true);
OutputStream params = con.getOutputStream();
Utils.copy(request.getInputStream(), params);
params.flush();
params.close();
}
int responseCode = con.getResponseCode();
//Copy response code
response.setStatus(responseCode);
//Copy response headers
Map<String, List<String>> map = con.getHeaderFields();
for (Map.Entry<String, List<String>> entry : map.entrySet())
{
String key = entry.getKey();
if (key != null)
{
for (String val : entry.getValue())
{
response.addHeader(entry.getKey(), val);
}
}
}
//Copy response
OutputStream out = response.getOutputStream();
//Error
if (responseCode >= 400)
{
Utils.copy(con.getErrorStream(), out);
}
else //Success
{
Utils.copy(con.getInputStream(), out);
}
out.flush();
out.close();
}
catch (Exception e)
{
response.setStatus(
HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
doRequest("GET", request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
doRequest("POST", request, response);
}
}
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