/*
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neon-adoc - Asciidoctor extensions to Neon
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Copyright (C) 2024 Ulrich Hilger
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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 <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.neon.adoc;
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import com.sun.net.httpserver.Filter;
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import com.sun.net.httpserver.HttpContext;
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import com.sun.net.httpserver.HttpExchange;
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import de.uhilger.neon.FileServer;
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import de.uhilger.neon.HttpHelper;
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import java.io.File;
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import java.io.IOException;
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import java.net.URI;
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/**
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* AdocFilter prueft, ob fuer eine Asciidoctor-Quelldatei bereits eine HTML-Version vorliegt. Wenn
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* nicht, verwendet der AdocFilter den AdocActor, um eine HTML-Version zu erzeugen.
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*
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* @author Ulrich Hilger
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* @version 1, 16.06.2021
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*/
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public class AdocFilter extends Filter {
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@Override
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public void doFilter(HttpExchange exchange, Chain chain) throws IOException {
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URI uri = exchange.getRequestURI();
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try {
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String fileName = new HttpHelper().getFileName(exchange);
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if(fileName.endsWith(".adoc")) {
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HttpContext ctx = exchange.getHttpContext();
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String fileBase = ctx.getAttributes().get(FileServer.ATTR_FILE_BASE).toString();
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String query = uri.getQuery();
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if (query instanceof String && query.contains("pdf=true")) {
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processAdocFile(new File(fileBase, fileName), true);
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} else {
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processAdocFile(new File(fileBase, fileName), false);
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}
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}
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} catch (IllegalArgumentException ex) {
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// ungueltiger Dateiname, keine Transformation noetig, also tue nichts
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} finally {
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chain.doFilter(exchange);
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}
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}
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/**
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* Eine Asciidoc-Quelldatei nach HTML und optional PDF transformieren, sofern
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* eine HTML-Datei noch nicht existiert oder die HTML-Datei aelter ist, als
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* die Asciidoc-Quelldatei
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*
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* @param adocfile das Objekt, das auf die Quelldatei im Asciidoc-Format verweist
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* @param createPdf true, wenn auch nach PDF transformiert werden soll,
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* sonst wird nur nach HTML transformiert
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*/
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private void processAdocFile(File adocfile, boolean createPdf) {
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String absname = adocfile.getAbsolutePath();
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File htmlfile = getTargetFile(adocfile, "html");
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AdocWorker worker = null;
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if(!htmlfile.exists() || adocfile.lastModified() > htmlfile.lastModified()) {
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worker = new AdocWorker();
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worker.transform(absname);
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}
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if(createPdf) {
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String pdfStr = "pdf";
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File pdffile = getTargetFile(adocfile, pdfStr);
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if(!pdffile.exists() || adocfile.lastModified() > pdffile.lastModified()) {
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if(!(worker instanceof AdocWorker)) {
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worker = new AdocWorker();
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}
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worker.transform(absname, pdfStr);
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}
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}
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}
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public File getTargetFile(File adocfile, String ext) {
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String dot = ".";
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String nameext = adocfile.getName();
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String fname = nameext.substring(0, nameext.lastIndexOf(dot));
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File outfile = new File(adocfile.getParentFile(), fname + dot + ext);
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return outfile;
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}
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@Override
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public String description() {
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return "Asciidoctor Filter";
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}
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}
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