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package de.uhilger.wbx.web;
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import de.uhilger.wbx.WbxUtils;
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import de.vogella.rss.model.Feed;
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import de.vogella.rss.model.FeedMessage;
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import java.io.File;
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import java.io.FileReader;
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import java.io.IOException;
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import java.io.Reader;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Locale;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* <p>Das FeedServlet erstellt Feeds von Ordnern der WebBox</p>
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*
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* <p>Annahmen:</p>
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* <ul>
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* <li>Der JNDI-Parameter <code>wbxFileBase</code> enthaelt den absoluten Pfad
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* zur Dateiablage</li>
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* <li>Der Parameter 'wbxPubDir' enthaelt den Namen des Ordners mit
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* oeffentlichen Inhalten und dieser Ordner liegt direkt unterhalb von
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* <code>wbxFileBase</code></li>
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* <li>Der Ordner mit dem oeffentlichen Inhalt wird von Tomcat als Context
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* 1:1 ausgeliefert sodass bei einem URL wie
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* <code>http://example.com/[Context]/weitere/pfad/angaben/datei.html</code>
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* die Pfadangabe hinter <code>[Context]/</code> die Inhalte innerhalb von
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* <code>wbxFileBase/wbxPubDir</code> 1:1 wiedergibt.</li>
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*
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* <p>Der JNDI-Parameter <code>wbxMaxFeedDepth</code> regelt, wie viele Ebenen der
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* Ordnerstruktur maximal nach Eintraegen durchsucht werden. Dabei haben die
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* tiefsten Ebenen Vorrang vor hoeher gelegenen Ebenen, d.h. Dateien auf
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* tieferen Ebenen werden vor Dateien auf hoeheren Ebenen in den Feed
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* aufgenommen.</p>
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*
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* <p>Der JNDI-Parameter <code>wbxMaxFeedEntries</code> regelt, wie viele Beitraege
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* maximal im Feed erscheinen. Der Standardwert ist fuenf Beitraege, d.h., die
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* ersten fuenf gefundenen Beitraege werden chronologisch absteigend sortiert
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* nach ihrem letzten Aenderungsdatum ausgegeben.</p>
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*
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* <p>Die Datei <code>CATALINA_BASE/conf/context.xml</code> muss also die
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* folgenden Eintraege enthalten:</p>
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* <pre>
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* <Environment name="wbxFileBase" type="java.lang.String" value="absoluter/pfad/zur/dateiablage" override="false" />
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* <Environment name="wbxPubDirName" type="java.lang.String" value="/www" override="false" />
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* <Environment name="wbxFeedTitle" type="java.lang.String" value="Newsfeed" override="false" />
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* <Environment name="wbxFeedSubtitle" type="java.lang.String" value="Text des Untertitels" override="false" />
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* <Environment name="wbxFeedCopyright" type="java.lang.String" value="Text des Copyright-Hinweises" override="false" />
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* <Environment name="wbxFeedDomain" type="java.lang.String" value="http://example.com" override="false" />
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* <Environment name="wbxFeedAuthor" type="java.lang.String" value="Name des Autors" override="false" />
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* </pre>
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*/
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public class FeedServlet extends HttpServlet {
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private static final Logger logger = Logger.getLogger(FeedServlet.class.getName());
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//public static final String JNDI_CTX_NAME = "java:comp/env";
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//public static final String WBX_FILE_BASE = "wbxFileBase";
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//public static final String WBX_PUB_DIR = "wbxPubDir";
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public static final String WBX_MAX_FEED_DEPTH = "wbxMaxFeedDepth";
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public static final String WBX_MAX_FEED_ENTRIES = "wbxMaxFeedEntries";
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public static final String WBX_FEED_TITLE = "wbxFeedTitle";
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public static final String WBX_FEED_SUBTITLE = "wbxFeedSubtitle";
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public static final String WBX_FEED_COPYRIGHT = "wbxFeedCopyright";
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public static final String WBX_FEED_DOMAIN = "wbxFeedDomain";
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public static final String WBX_FEED_AUTHOR = "wbxFeedAuthor";
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public static final int WBX_DEF_MAX_FEED_DEPTH = 3;
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public static final int WBX_DEF_MAX_FEED_ENTRIES = 5;
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
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ServletOutputStream out = response.getOutputStream();
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response.setContentType("text/xml");
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String url = request.getRequestURL().toString();
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logger.fine("requestURL: " + url);
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String contextPath = request.getContextPath();
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logger.fine("contextPath: " + contextPath);
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String zielPfad = url.substring(url.indexOf(contextPath));
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logger.fine(zielPfad);
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WbxUtils wu = new WbxUtils();
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String basis = wu.getJNDIParameter(WbxUtils.WBX_FILE_BASE, WbxUtils.EMPTY_STRING);
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logger.fine("basis: " + basis);
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StringBuffer pfad = new StringBuffer();
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pfad.append(basis);
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pfad.append(zielPfad.replace(contextPath, wu.getJNDIParameter(WbxUtils.WBX_PUB_DIR_NAME, WbxUtils.WBX_DEFAULT_PUB_DIR_NAME)));
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logger.fine("pfad: " + pfad);
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String dirStr = pfad.toString().substring(0, pfad.lastIndexOf("/"));
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logger.fine("dirStr: " + dirStr);
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File dir = new File(dirStr);
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if (dir.isDirectory()) {
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List beitraege = new ArrayList();
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int maxBeitraege = wu.getJNDIInt(WBX_MAX_FEED_ENTRIES, WBX_DEF_MAX_FEED_ENTRIES);
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int maxTiefe = wu.getJNDIInt(WBX_MAX_FEED_DEPTH, WBX_DEF_MAX_FEED_DEPTH);
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wu.collectFiles(dir, 0, beitraege, maxTiefe, maxBeitraege);
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Iterator i = beitraege.iterator();
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while (i.hasNext()) {
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File f = (File) i.next();
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logger.fine(f.getAbsolutePath() + " " + f.lastModified());
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}
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writeFeed(wu.getJNDIParameter(WBX_FEED_TITLE, WbxUtils.EMPTY_STRING),
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wu.getJNDIParameter(WBX_FEED_SUBTITLE, WbxUtils.EMPTY_STRING), out, beitraege,
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basis, pfad.toString(), contextPath, wu);
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} else {
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logger.fine(dir.getAbsolutePath() + " ist kein Ordner.");
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}
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}
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public void writeFeed(String feedTitel, String beschr, ServletOutputStream s,
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List beitraege, String basis, String pfad, String contextPath, WbxUtils wu) {
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long newest = -1;
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String copyright = wu.getJNDIParameter(WBX_FEED_COPYRIGHT, WbxUtils.EMPTY_STRING);
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String domain = wu.getJNDIParameter(WBX_FEED_DOMAIN, WbxUtils.EMPTY_STRING);
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String title = feedTitel;
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String description = beschr;
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String language = "de";
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String link = domain;
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newest = ((File) beitraege.get(0)).lastModified();
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Calendar cal = new GregorianCalendar();
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cal.setTime(new Date(newest));
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Date creationDate = cal.getTime();
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SimpleDateFormat date_format = new SimpleDateFormat(
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"EEE', 'dd' 'MMM' 'yyyy' 'HH:mm:ss' 'Z", Locale.US);
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String pubdate = date_format.format(creationDate);
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Feed rssFeed = new Feed(title, link, description, language,
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copyright, pubdate);
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Iterator i = beitraege.iterator();
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while (i.hasNext()) {
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File f = (File) i.next();
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FeedMessage feedEintrag = new FeedMessage();
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feedEintrag.setTitle(f.getName());
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//feedEintrag.setDescription("Beschreibung hier");
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feedEintrag.setAuthor(wu.getJNDIParameter(WBX_FEED_AUTHOR, WbxUtils.EMPTY_STRING));
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String urlStr = f.getAbsolutePath();
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urlStr = urlStr.replace(basis, domain);
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urlStr = urlStr.replace(wu.getJNDIParameter(WbxUtils.WBX_PUB_DIR_NAME, WbxUtils.WBX_DEFAULT_PUB_DIR_NAME), contextPath);
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logger.fine(urlStr);
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feedEintrag.setGuid(urlStr);
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feedEintrag.setLink(urlStr);
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logger.fine(f.getName());
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feedEintrag.setDescription(readFilePart(f, urlStr));
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rssFeed.getMessages().add(feedEintrag);
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}
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FeedStreamWriter writer = new FeedStreamWriter(rssFeed, s);
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try {
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writer.write();
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} catch (Exception e) {
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logger.log(Level.SEVERE, e.getMessage(), e);
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}
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}
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private String readFilePart(File f, String urlStr) {
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StringBuffer buf = new StringBuffer();
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Reader reader = null;
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try {
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String fn = f.getName().toLowerCase();
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if(fn.endsWith(".jpg") || fn.endsWith(".jpeg") || fn.endsWith(".png")) {
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String noExt;
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String ext;
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int dotpos = urlStr.lastIndexOf('.');
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if(dotpos > -1) {
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noExt = urlStr.substring(0, dotpos);
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ext = urlStr.substring(dotpos);
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} else {
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noExt = "";
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ext = "";
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}
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buf.append("<a href='");
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buf.append(urlStr);
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buf.append("'><img src='");
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buf.append(noExt);
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buf.append("_kl");
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buf.append(ext);
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buf.append("'></a>");
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} else {
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reader = new FileReader(f);
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char[] readBuffer = new char[1024];
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int charsRead = reader.read(readBuffer);
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buf.append(readBuffer);
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reader.close();
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}
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return buf.toString();
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} catch (Exception ex) {
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logger.log(Level.SEVERE, null, ex);
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return buf.toString();
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}
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}
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}
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