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import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.DispatcherType;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
public class app extends HttpServlet
{
private String id;
private class RequestWrapper extends HttpServletRequestWrapper
{
public RequestWrapper(HttpServletRequest r)
{
super(r);
}
}
private class ResponseWrapper extends HttpServletResponseWrapper
{
public ResponseWrapper(HttpServletResponse r)
{
super(r);
}
}
@Override
public void init(ServletConfig sc)
throws ServletException
{
id = sc.getInitParameter("id");
}
private RequestDispatcher getRequestDispatcher(HttpServletRequest request, String str)
{
String disp = request.getParameter("disp");
if (disp != null && disp.equals("ctx")) {
return request.getServletContext().getRequestDispatcher(str);
}
if (disp != null && disp.equals("name")) {
return request.getServletContext().getNamedDispatcher(str);
}
if (disp == null || disp.equals("req")) {
return request.getRequestDispatcher(str);
}
return null;
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
String dtype = "" + request.getDispatcherType();
response.addHeader("X-" + dtype + "-Id", id);
response.addHeader("X-" + dtype + "-Request-URI", "" + request.getRequestURI());
response.addHeader("X-" + dtype + "-Servlet-Path", "" + request.getServletPath());
response.addHeader("X-" + dtype + "-Path-Info", "" + request.getPathInfo());
response.addHeader("X-" + dtype + "-Query-String", "" + request.getQueryString());
response.addHeader("X-" + dtype + "-Dispatcher-Type", "" + request.getDispatcherType());
response.setContentType("text/plain; charset=utf-8");
Map<String, String[]> pmap = request.getParameterMap();
for (Map.Entry<String,String[]> p : pmap.entrySet()) {
response.addHeader("X-" + dtype + "-Param-" + p.getKey(), "" + String.join(",", p.getValue()));
}
PrintWriter out = response.getWriter();
if (id.equals("fwd")) {
String uri = request.getParameter("uri");
if (uri != null && request.getDispatcherType() != DispatcherType.FORWARD) {
response.addHeader("X-Forward-To", "" + uri);
out.println("Before forwarding.");
RequestDispatcher d = getRequestDispatcher(request, uri);
if (d == null) {
out.println("Dispatcher is null");
return;
}
try {
d.forward(new RequestWrapper(request), new ResponseWrapper(response));
} catch(Exception e) {
response.addHeader("X-Exception", "" + e);
}
response.addHeader("X-After-Forwarding", "you-should-not-see-this");
out.println("After forwarding.");
return;
}
}
if (id.equals("data")) {
response.addHeader("X-" + RequestDispatcher.FORWARD_REQUEST_URI, "" + request.getAttribute(RequestDispatcher.FORWARD_REQUEST_URI));
response.addHeader("X-" + RequestDispatcher.FORWARD_CONTEXT_PATH, "" + request.getAttribute(RequestDispatcher.FORWARD_CONTEXT_PATH));
response.addHeader("X-" + RequestDispatcher.FORWARD_SERVLET_PATH, "" + request.getAttribute(RequestDispatcher.FORWARD_SERVLET_PATH));
response.addHeader("X-" + RequestDispatcher.FORWARD_PATH_INFO, "" + request.getAttribute(RequestDispatcher.FORWARD_PATH_INFO));
response.addHeader("X-" + RequestDispatcher.FORWARD_QUERY_STRING, "" + request.getAttribute(RequestDispatcher.FORWARD_QUERY_STRING));
out.println("app.doGet(): #" + this + ", " + id);
out.println("RequestURI: " + request.getRequestURI());
out.println("ServletPath: " + request.getServletPath());
out.println("PathInfo: " + request.getPathInfo());
out.println("DispType: " + request.getDispatcherType());
out.println("QueryString: " + request.getQueryString());
for (Map.Entry<String,String[]> p : pmap.entrySet()) {
out.println("- " + p.getKey() + "=" + String.join(",", p.getValue()));
}
return;
}
response.sendError(404);
}
}
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