/*
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WebBox - Dein Server.
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Copyright (C) 2017 Ulrich Hilger, http://uhilger.de
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.uhilger.wbx.web;
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import java.io.File;
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import java.io.IOException;
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import java.io.UnsupportedEncodingException;
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import java.net.URLDecoder;
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import java.util.logging.Logger;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import net.coobird.thumbnailator.Thumbnails;
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import org.apache.catalina.servlets.DefaultServlet;
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/**
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* Mit dem TNServlet kann für eine Bilddatei eine
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* Miniaturansicht erzeugt werden, wie sie im Dateimanager
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* der WebBox verwendet wird.
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*
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* Unterstuetzt werden die Varianten
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* 120 (_tn), 240 (_kl), 500 (_dd), 700 (_mt), 1200 (_gr)
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*/
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public class TNServlet extends DefaultServlet {
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private static final Logger logger = Logger.getLogger(TNServlet.class.getName());
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/**
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* Diese String-Konstanten noetigenfalls in eine
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* Konfigurationsdatei auslagern
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*/
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public static final String TN = "_tn";
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public static final String KL = "_kl";
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public static final String SM = "_sm";
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public static final String MT = "_mt";
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public static final String GR = "_gr";
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public static final String JPG = ".jpg";
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public static final String JPEG = ".jpeg";
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public static final String PNG = ".png";
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/**
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* Handles the HTTP <code>GET</code> method.
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*
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* @param request servlet request
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* @param response servlet response
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* @throws ServletException if a servlet-specific error occurs
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* @throws IOException if an I/O error occurs
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*/
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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String uriStr = request.getRequestURI();
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String relname = uriStr.substring(request.getContextPath().length());
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// --- Logausgabe Start
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File logurifile = new File(uriStr);
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String loguriStr = uriStr.substring(request.getContextPath().length());
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File logdir = new File(request.getServletContext().getRealPath("/"));
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File logimgfile = new File(logdir, loguriStr);
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StringBuffer buf = new StringBuffer();
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buf.append("contextPath: ");
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buf.append(request.getContextPath());
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buf.append("\n");
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buf.append("realpath of /: ");
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buf.append(request.getServletContext().getRealPath("/"));
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buf.append("\n");
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buf.append("urifile: ");
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buf.append(logurifile.getAbsolutePath());
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buf.append("\n");
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buf.append("imgfile: ");
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buf.append(logimgfile.getAbsolutePath());
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logger.fine(buf.toString());
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// --- Logausgabe Ende
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if(uriStr.endsWith(JPG) || uriStr.endsWith(JPEG) || uriStr.endsWith(PNG)) {
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if(uriStr.contains(TN)) {
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bildAusgeben(request, response, relname, TN, 120);
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} else if(uriStr.contains(KL)) {
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bildAusgeben(request, response, relname, KL, 240);
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} else if(uriStr.contains(SM)) {
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bildAusgeben(request, response, relname, SM, 500);
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} else if(uriStr.contains(MT)) {
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bildAusgeben(request, response, relname, MT, 700);
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} else if(uriStr.contains(GR)) {
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bildAusgeben(request, response, relname, GR, 1200);
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} else {
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super.doGet(request, response);
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}
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} else {
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super.doGet(request, response);
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}
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}
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private void bildAusgeben(HttpServletRequest request, HttpServletResponse response, String relname, String indicator, int gr) throws UnsupportedEncodingException, IOException {
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File dir = new File(request.getServletContext().getRealPath("/"));
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relname = relname.replace(indicator, "");
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File imgfile = new File(dir, URLDecoder.decode(relname, "utf-8"));
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// 120, 240, 500, 700, 1200
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Thumbnails.of(imgfile)
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.size(gr, gr)
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.keepAspectRatio(true)
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.outputQuality(0.7)
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.toOutputStream(response.getOutputStream());
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}
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}
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