/*
WebBox - Dein Server.
Copyright (C) 2017 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 .
*/
package de.uhilger.wbx.web;
import de.uhilger.wbx.Bild;
import java.awt.Container;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.servlets.DefaultServlet;
/**
* Mit dem TNServlet kann für eine Bilddatei eine
* Miniaturansicht erzeugt werden, wie sie im Dateimanager
* der WebBox verwendet wird.
*
* Unterstuetzt werden die Varianten
* 120 (_tn), 240 (_kl), 500 (_dd), 700 (_mt), 1200 (_gr)
*/
public class TNServlet extends DefaultServlet {
private static final Logger logger = Logger.getLogger(TNServlet.class.getName());
/**
* Diese String-Konstanten noetigenfalls in eine
* Konfigurationsdatei auslagern
*/
public static final String TN = "_tn";
public static final String KL = "_kl";
public static final String SM = "_sm";
public static final String MT = "_mt";
public static final String GR = "_gr";
public static final String JPG = ".jpg";
public static final String JPEG = ".jpeg";
public static final String PNG = ".png";
/**
* 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 uriStr = request.getRequestURI();
String relname = uriStr.substring(request.getContextPath().length());
// --- Logausgabe Start
File logurifile = new File(uriStr);
String loguriStr = uriStr.substring(request.getContextPath().length());
File logdir = new File(request.getServletContext().getRealPath("/"));
File logimgfile = new File(logdir, loguriStr);
StringBuffer buf = new StringBuffer();
buf.append("contextPath: ");
buf.append(request.getContextPath());
buf.append("\n");
buf.append("realpath of /: ");
buf.append(request.getServletContext().getRealPath("/"));
buf.append("\n");
buf.append("urifile: ");
buf.append(logurifile.getAbsolutePath());
buf.append("\n");
buf.append("imgfile: ");
buf.append(logimgfile.getAbsolutePath());
logger.fine(buf.toString());
// --- Logausgabe Ende
if(uriStr.endsWith(JPG) || uriStr.endsWith(JPEG) || uriStr.endsWith(PNG)) {
if(uriStr.contains(TN)) {
bildAusgeben(request, response, relname, TN, Bild.WINZIG);
} else if(uriStr.contains(KL)) {
bildAusgeben(request, response, relname, KL, Bild.KLEIN);
} else if(uriStr.contains(SM)) {
bildAusgeben(request, response, relname, SM, Bild.SEMI);
} else if(uriStr.contains(MT)) {
bildAusgeben(request, response, relname, MT, Bild.MITTEL);
} else if(uriStr.contains(GR)) {
bildAusgeben(request, response, relname, GR, Bild.GROSS);
} else {
super.doGet(request, response);
}
} else {
super.doGet(request, response);
}
}
private void bildAusgeben(HttpServletRequest request, HttpServletResponse response, String relname, String indicator, int bildTyp) throws UnsupportedEncodingException, IOException {
File dir = new File(request.getServletContext().getRealPath("/"));
relname = relname.replace(indicator, "");
File imgfile = new File(dir, URLDecoder.decode(relname, "utf-8"));
Image image = Toolkit.getDefaultToolkit().getImage(imgfile.getAbsolutePath());
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.addImage(image, 0);
try {
mediaTracker.waitForID(0);
if (!mediaTracker.isErrorAny()) {
Bild bild = new Bild();
bild.writeImageStream(image, bild.getVariantenGroesse(bildTyp), bild.getMimeType(imgfile), response.getOutputStream());
}
} catch (InterruptedException ex) {
logger.log(Level.SEVERE, ex.getLocalizedMessage(), ex);
}
}
}