package de.uhilger.wbx.web;
/*
WebBox - Dein Server.
Copyright (C) 2019 Ulrich Hilger, http://uhilger.de
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see .
*/
import java.io.IOException;
import java.security.Principal;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.servlets.DefaultServlet;
/**
* Das MdServlet fügt dem DefaultServlet von Tomcat
* Methoden hinzu, mit denen Markdown-Inhalte (*.md)
* zu ganzen HTML-Seiten
* mit head und body tags sowie Stylesheet-Verweisen
* ergänzt werden
*
* Die hier hinzugefuegten Inhalte verweisen lediglich auf
* die Javscript-Biliothek strapdown.js
* (http://strapdownjs.com), das Rendern
* des Markdown zu HTML geschieht dann auf dem Client.
*
* TODO: Stylesheets dynamisch einbinden
*/
public class MdServlet extends DefaultServlet {
private static final Logger logger = Logger.getLogger(MdServlet.class.getName());
private static final String HOME_CTX = "/home";
private String getTitle() {
String title = null;
return title;
}
private void seiteAusgeben(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
ServletOutputStream out = response.getOutputStream();
printHeader(out, request);
super.doGet(request, response);
printFooter(out);
}
private void printHeader(ServletOutputStream out, HttpServletRequest request) throws IOException {
out.print("\r\n");
out.print("\r\n");
out.print("\r\n");
out.print("\r\n");
out.print("\r\n");
String title = getTitle();
if(title != null) {
out.print("");
out.print(title);
out.print(" ");
out.print(request.getRequestURI());
out.print("\r\n");
}
out.print("\r\n");
out.print("\r\n");
}
private void printFooter(ServletOutputStream out) throws IOException {
out.print("\r\n\r\n");
out.print("\r\n");
out.print("");
}
/**
* Handles the HTTP GET method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String contextPath = request.getContextPath();
if(HOME_CTX.equals(contextPath)) {
String userName = getUserName(request);
if (userName != null) {
String urlUser = getUrlUser(request, userName);
if(userName.equals(urlUser)) {
seiteAusgeben(request, response);
} else {
logger.fine("Wrong user.");
}
} else {
logger.fine("Missing login.");
}
} else {
seiteAusgeben(request, response);
}
}
protected String getUrlUser(HttpServletRequest request, String userName) {
String result = "";
String requestUrlStr = request.getRequestURL().toString();
String contextPath = request.getContextPath();
if(contextPath != null && requestUrlStr != null && userName != null) {
int start = requestUrlStr.indexOf(contextPath);
start += contextPath.length();
start++;
int end = start + userName.length();
try {
result = requestUrlStr.substring(start, end);
} catch(Exception ex) {
logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
}
}
return result;
}
protected String getUserName(HttpServletRequest hr) {
String userName = null;
Object p = hr.getUserPrincipal();
if (p instanceof Principal) {
userName = ((Principal) p).getName();
}
return userName;
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "MarkdownWrapper Servlet";
}
}