/*
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http-adoc - Asciidoctor extensions to jdk.httpserver
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Copyright (C) 2021 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.httpserver.adoc;
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import com.sun.net.httpserver.HttpExchange;
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import de.uhilger.httpserver.base.HttpResponder;
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import java.io.File;
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import java.io.IOException;
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import java.util.Map;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import static org.asciidoctor.Asciidoctor.Factory.create;
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import org.asciidoctor.Asciidoctor;
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import static org.asciidoctor.AttributesBuilder.attributes;
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import static org.asciidoctor.OptionsBuilder.options;
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import org.asciidoctor.SafeMode;
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/**
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* Der AdocActor transformiert den Asciidoctor-Quellcode aus einer
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* gegebenen Datei zu HTML oder PDF und legt das Ergebnis als HTML- oder
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* PDF-Datei ab.
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*
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* Der AdocActor benötigt AsciidoctorJ im Classpath.
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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 AdocActor {
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private static final Logger logger = Logger.getLogger(AdocActor.class.getName());
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private static final String DOT = ".";
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public static final String HTML = "html";
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public static final String PDF = "pdf";
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public void handle(HttpExchange e, String fileBase, String fileName) throws IOException {
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File adocfile = new File(fileBase, fileName);
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logger.fine("adocfile: " + adocfile.getAbsolutePath());
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AdocActor actor = new AdocActor();
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File outfile = actor.getTargetFile(adocfile, AdocActor.HTML);
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logger.fine("outfile: " + outfile.getAbsolutePath());
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HttpResponder fs = new HttpResponder();
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fs.serveFile(e, outfile);
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}
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public File getTargetFile(File adocfile, String ext) {
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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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logger.log(Level.FINE, "out: {0}", outfile.getAbsolutePath());
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return outfile;
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}
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public void processAdocFile(File adocfile, String pdf) {
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String absname = adocfile.getAbsolutePath();
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logger.log(Level.FINE, "in: {0}", absname);
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// HTML-Datei ermitteln
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File outfile = getTargetFile(adocfile, HTML);
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File htmlfile = outfile;
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/*
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nach HTML transformieren, wenn die Quelle sich geandert hat oder
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die HTML-Datei noch nicht existiert
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*/
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if(!htmlfile.exists() || adocfile.lastModified() > htmlfile.lastModified()) {
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logger.fine("calling transform for " + absname);
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transform(absname);
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}
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/*
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nach PDF transformieren, wenn der Parameter pdf=true existiert und
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wenn die Quelle sich geandert hat oder
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die PDF-Datei noch nicht existiert
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*/
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if(null != pdf && pdf.equalsIgnoreCase(Boolean.TRUE.toString())) {
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//File pdffile = new File(adocfile.getParentFile(), fname + DOT + PDF);
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File pdffile = getTargetFile(adocfile, PDF);
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outfile = pdffile; // PDF soll zurueckgegeben werden
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if(!pdffile.exists() || adocfile.lastModified() > pdffile.lastModified()) {
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//response.setContentType("application/pdf");
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transform(absname, PDF);
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}
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}
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}
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/**
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* Nach HTML transformieren
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* @param fileName der Dateiname der Quelldatei samt absoluter Pfadangabe
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*/
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private void transform(String fileName) {
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transform(fileName, null);
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}
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/**
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* In ein Format transformieren, das von einem 'Backend' von Asciidoctor
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* unterstuetzt wird
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* @param fileName der Dateiname der Quelldatei samt absoluter Pfadangabe
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* @param backend das Kuerzel des Backends, z.B. der String 'pdf', wenn
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* nach PDF transformiert werden soll
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*/
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private void transform(String fileName, String backend) {
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logger.fine("fileName: " + fileName + ", backend: " + backend);
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Map<String, Object> attributes;
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File outFile = new File(fileName);
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String thisDirName = outFile.getParent();
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File pdfStyles = new File(outFile.getParentFile(), "custom-theme.yml");
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if(pdfStyles.exists()) {
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attributes = attributes()
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.attribute("pdf-themesdir", thisDirName)
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.attribute("pdf-theme","custom")
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.attribute("pdf-fontsdir", thisDirName + "/fonts")
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.attribute("allow-uri-read")
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.sourceHighlighter("highlightjs")
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.asMap();
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} else {
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attributes = attributes()
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.sourceHighlighter("highlightjs")
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.asMap();
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}
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Map<String, Object> options;
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if(null != backend) {
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options = options().inPlace(false)
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.safe(SafeMode.SERVER)
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.backend(backend).attributes(attributes).asMap();
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} else {
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options = options().inPlace(false)
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.safe(SafeMode.SERVER)
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.attributes(attributes).asMap();
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}
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File adcf = new File(fileName);
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logger.fine("before asciidoctor create, adcf: " + adcf.getAbsolutePath());
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Asciidoctor asciidoctor = create();
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logger.fine("asciidoctor created.");
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asciidoctor.requireLibrary("asciidoctor-diagram");
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logger.fine("asciidoctor requireLibrary diagram passed.");
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logger.fine("calling asciidoctor.convert for file " + adcf.getAbsolutePath());
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asciidoctor.convertFile(adcf, options);
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}
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}
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