org.snipsnap.net.admin.ThemeImageServlet.java Source code

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Here is the source code for org.snipsnap.net.admin.ThemeImageServlet.java

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/*
 * This file is part of "SnipSnap Wiki/Weblog".
 *
 * Copyright (c) 2002,2003 Fraunhofer Gesellschaft
 * Fraunhofer Institut for Computer Architecture and Software Technology
 * All Rights Reserved.
 *
 * Please visit http://snipsnap.org/ for updates and contact.
 *
 * --LICENSE NOTICE--
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 * --LICENSE NOTICE--
 */
package org.snipsnap.net.admin;

import org.dom4j.Document;
import org.dom4j.Element;
import org.radeox.util.logging.Logger;
import snipsnap.api.app.Application;
import snipsnap.api.config.Configuration;
import snipsnap.api.snip.Snip;
import org.snipsnap.snip.attachment.Attachment;
import org.snipsnap.snip.attachment.storage.AttachmentStorage;
import snipsnap.api.container.Components;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.BinaryDecoder;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Map;

public class ThemeImageServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("name");

        Configuration config = Application.get().getConfiguration();
        Map installedThemes = ThemeHelper.getInstalledThemes();
        AttachmentStorage storage = (AttachmentStorage) snipsnap.api.container.Components
                .getComponent(AttachmentStorage.class);
        if (installedThemes.containsKey(name)) {
            Snip themeSnip = (snipsnap.api.snip.Snip) installedThemes.get(name);
            Attachment att = themeSnip.getAttachments().getAttachment("screenshot.png");
            if (att != null) {
                sendImage(response, storage.getInputStream(att), (int) att.getSize(), att.getContentType());
                return;
            }
        } else {
            Map themeDocs = ThemeHelper.getThemeDocuments(config, ThemeHelper.DOCUMENTS);
            Document themeDoc = (Document) themeDocs.get(name);
            if (null != themeDoc) {
                Element attEl = getThemeElement(themeDoc, name);
                if (attEl.element("data") != null) {
                    try {
                        sendImage(response, getImageStream(attEl.elementText("data")),
                                Integer.parseInt(attEl.elementText("size")), attEl.elementText("contentType"));
                        return;
                    } catch (Exception e) {
                        Logger.warn("unable to read image stream", e);
                    }
                }
            }
        }
        response.sendError(HttpServletResponse.SC_NOT_FOUND);
    }

    private InputStream getImageStream(String base64str) throws Exception {
        byte buffer[] = Base64.decodeBase64(base64str.getBytes("UTF-8"));
        return new ByteArrayInputStream(buffer);
    }

    private Element getThemeElement(Document doc, String name) {
        Iterator it = doc.getRootElement().elementIterator("snip");
        while (it.hasNext()) {
            Element element = (Element) it.next();
            String snipName = element.elementText("name");
            if (null != snipName && snipName.endsWith(name)) {
                Iterator attIt = element.element("attachments").elementIterator("attachment");
                while (attIt.hasNext()) {
                    Element attEl = (Element) attIt.next();
                    if (attEl.elementText("name").equals("screenshot.png")) {
                        return attEl;
                    }
                }
            }
        }
        return null;
    }

    private void sendImage(HttpServletResponse response, InputStream imageStream, int contentLength,
            String contentType) throws IOException {
        response.setContentType(contentType);
        response.setContentLength(contentLength);

        OutputStream out = response.getOutputStream();
        byte[] buffer = new byte[4096];
        int n = 0;
        while ((n = imageStream.read(buffer)) != -1) {
            out.write(buffer, 0, n);
        }
        out.close();
    }

}