175 lines
7.3 KiB
Java
175 lines
7.3 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* Project Info: https://plantuml.com
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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package net.sourceforge.plantuml.servlet;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.util.HashMap;
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import java.util.List;
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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 java.util.stream.Collectors;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.transform.OutputKeys;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import jakarta.servlet.ServletException;
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import jakarta.servlet.http.HttpServlet;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import net.sourceforge.plantuml.theme.ThemeUtils;
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import net.sourceforge.plantuml.openiconic.data.DummyIcon;
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import org.w3c.dom.Document;
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import org.w3c.dom.NodeList;
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import org.xml.sax.SAXException;
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/**
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* Small PlantUML frontend or UI helper.
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*/
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@SuppressWarnings("SERIAL")
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public class PlantUmlUIHelperServlet extends HttpServlet {
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private interface HelperConsumer {
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void accept(HttpServletRequest request, HttpServletResponse response) throws IOException;
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}
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private final Map<String, HelperConsumer> helpers = new HashMap<>();
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private String svgIconsSpriteCache = null;
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public PlantUmlUIHelperServlet() {
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// add all supported request items/helper methods
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helpers.put("icons.svg", this::sendIconsSprite);
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helpers.put("icons", this::sendIcons);
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helpers.put("themes", this::sendThemes);
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}
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@Override
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public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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request.setCharacterEncoding("UTF-8");
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final String requestItem = request.getParameter("request");
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final HelperConsumer requestHelper = this.helpers.get(requestItem);
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String errorMsg = null;
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if (requestItem == null) {
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errorMsg = "Request item not set.";
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} else if (requestHelper == null) {
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errorMsg = "Unknown requested item: " + requestItem;
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}
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if (errorMsg != null) {
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response.addHeader("Access-Control-Allow-Origin", "*");
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response.setContentType("text/plain;charset=UTF-8");
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response.getWriter().write(errorMsg);
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response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
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return;
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}
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requestHelper.accept(request, response);
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}
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private String toJson(List<String> list) {
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return "[" + list.stream()
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.map(item -> "\"" + item.replace("\"", "\\\"") + "\"")
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.collect(Collectors.joining(",")) + "]";
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}
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private void sendJson(HttpServletResponse response, String json) throws IOException {
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response.addHeader("Access-Control-Allow-Origin", "*");
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response.setContentType("application/json;charset=UTF-8");
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response.getWriter().write(json);
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}
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private List<String> getIcons() throws IOException {
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InputStream in = DummyIcon.class.getResourceAsStream("all.txt");
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try (BufferedReader br = new BufferedReader(new InputStreamReader(in))) {
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return br.lines().collect(Collectors.toList());
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}
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}
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private void sendIconsSprite(HttpServletRequest request, HttpServletResponse response) throws IOException {
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if (svgIconsSpriteCache == null) {
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// NOTE: all icons has the following svg tag attributes: width="8" height="8" viewBox="0 0 8 8"
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List<String> iconNames = getIcons();
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StringBuilder sprite = new StringBuilder();
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sprite.append("<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"8\" height=\"8\" viewBox=\"0 0 8 8\">\n");
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sprite.append("<defs>\n");
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sprite.append(" <style><![CDATA[\n");
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sprite.append(" .sprite { display: none; }\n");
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sprite.append(" .sprite:target { display: inline; }\n");
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sprite.append(" ]]></style>\n");
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sprite.append("</defs>\n");
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for (String name : iconNames) {
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try (InputStream in = DummyIcon.class.getResourceAsStream(name + ".svg")) {
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DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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Document doc = db.parse(in);
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Writer out = new StringWriter();
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out.write("<g class=\"sprite\" id=\"" + name + "\">");
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Transformer tf = TransformerFactory.newInstance().newTransformer();
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tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
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tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
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tf.setOutputProperty(OutputKeys.INDENT, "no");
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NodeList svgInnerNodes = doc.getElementsByTagName("svg").item(0).getChildNodes();
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for (int index = 0; index < svgInnerNodes.getLength(); index++) {
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tf.transform(new DOMSource(svgInnerNodes.item(index)), new StreamResult(out));
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}
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out.write("</g>");
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sprite.append(out.toString() + "\n");
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} catch (ParserConfigurationException | SAXException | TransformerException ex) {
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// skip icons which can not be parsed/read
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Logger logger = Logger.getLogger("com.plantuml");
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logger.log(Level.WARNING, "SVG icon '{0}' could not be parsed. Skip!", name);
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}
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}
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sprite.append("</svg>\n");
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svgIconsSpriteCache = sprite.toString();
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}
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response.addHeader("Access-Control-Allow-Origin", "*");
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response.setContentType("image/svg+xml;charset=UTF-8");
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response.getWriter().write(svgIconsSpriteCache);
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}
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private void sendIcons(HttpServletRequest request, HttpServletResponse response) throws IOException {
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sendJson(response, toJson(getIcons()));
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}
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private void sendThemes(HttpServletRequest request, HttpServletResponse response) throws IOException {
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sendJson(response, toJson(ThemeUtils.getAllThemeNames()));
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}
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}
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