mirror of
https://github.com/octoleo/plantuml-server.git
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162 lines
6.4 KiB
Java
162 lines
6.4 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: http://plantuml.sourceforge.net
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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.IOException;
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import java.io.PrintWriter;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import net.sourceforge.plantuml.BlockUml;
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import net.sourceforge.plantuml.FileFormat;
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import net.sourceforge.plantuml.FileFormatOption;
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import net.sourceforge.plantuml.SourceStringReader;
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import net.sourceforge.plantuml.StringUtils;
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import net.sourceforge.plantuml.core.DiagramDescription;
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import net.sourceforge.plantuml.core.Diagram;
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import net.sourceforge.plantuml.servlet.utility.NullOutputStream;
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import net.sourceforge.plantuml.version.Version;
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import net.sourceforge.plantuml.PSystemError;
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import net.sourceforge.plantuml.ErrorUml;
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/**
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* Delegates the diagram generation from the UML source and the filling of the HTTP response with the diagram in the
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* right format. Its own responsibility is to produce the right HTTP headers.
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*/
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class DiagramResponse {
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private static final String POWERED_BY = "PlantUML Version " + Version.versionString();
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private HttpServletResponse response;
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private FileFormat format;
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private HttpServletRequest request;
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private static final Map<FileFormat, String> CONTENT_TYPE;
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static {
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Map<FileFormat, String> map = new HashMap<FileFormat, String>();
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map.put(FileFormat.PNG, "image/png");
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map.put(FileFormat.SVG, "image/svg+xml");
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map.put(FileFormat.UTXT, "text/plain;charset=UTF-8");
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CONTENT_TYPE = Collections.unmodifiableMap(map);
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}
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DiagramResponse(HttpServletResponse r, FileFormat f, HttpServletRequest rq) {
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response = r;
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format = f;
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request = rq;
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}
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void sendDiagram(String uml, int idx) throws IOException {
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response.setContentType(getContentType());
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SourceStringReader reader = new SourceStringReader(uml);
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final BlockUml blockUml = reader.getBlocks().get(0);
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if (notModified(blockUml)) {
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addHeaderForCache(blockUml);
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response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
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return;
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}
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if (StringUtils.isDiagramCacheable(uml)) {
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addHeaderForCache(blockUml);
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}
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reader.outputImage(response.getOutputStream(), new FileFormatOption(format, false));
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}
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private boolean notModified(BlockUml blockUml) {
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final String ifNoneMatch = request.getHeader("If-None-Match");
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final long ifModifiedSince = request.getDateHeader("If-Modified-Since");
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if (ifModifiedSince != -1 && ifModifiedSince != blockUml.lastModified()) {
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return false;
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}
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final String etag = blockUml.etag();
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if (ifNoneMatch == null) {
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return false;
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}
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return ifNoneMatch.contains(etag);
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}
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void sendMap(String uml) throws IOException {
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response.setContentType(getContentType());
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SourceStringReader reader = new SourceStringReader(uml);
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final BlockUml blockUml = reader.getBlocks().get(0);
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if (StringUtils.isDiagramCacheable(uml)) {
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addHeaderForCache(blockUml);
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}
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String map = reader.outputImage(new NullOutputStream(),
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new FileFormatOption(FileFormat.PNG, false)).getDescription();
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String[] mapLines = map.split("[\\r\\n]");
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PrintWriter httpOut = response.getWriter();
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for (int i = 2; (i + 1) < mapLines.length; i++) {
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httpOut.print(mapLines[i]);
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}
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}
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void sendCheck(String uml) throws IOException {
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response.setContentType(getContentType());
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SourceStringReader reader = new SourceStringReader(uml);
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DiagramDescription desc = reader.outputImage(
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new NullOutputStream(), new FileFormatOption(FileFormat.PNG, false));
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PrintWriter httpOut = response.getWriter();
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httpOut.print(desc.getDescription());
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}
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private void addHeaderForCache(BlockUml blockUml) {
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long today = System.currentTimeMillis();
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// Add http headers to force the browser to cache the image
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final int maxAge = 3600 * 24 * 5;
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response.addDateHeader("Expires", today + 1000L * maxAge);
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response.addDateHeader("Date", today);
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response.addDateHeader("Last-Modified", blockUml.lastModified());
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response.addHeader("Cache-Control", "public, max-age=" + maxAge);
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// response.addHeader("Cache-Control", "max-age=864000");
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response.addHeader("Etag", "\"" + blockUml.etag() + "\"");
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final Diagram diagram = blockUml.getDiagram();
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response.addHeader("X-PlantUML-Diagram-Description", diagram.getDescription().getDescription());
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if (diagram instanceof PSystemError) {
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final PSystemError error = (PSystemError) diagram;
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for (ErrorUml err : error.getErrorsUml()) {
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response.addHeader("X-PlantUML-Diagram-Error", err.getError());
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response.addHeader("X-PlantUML-Diagram-Error-Line", "" + err.getPosition());
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}
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}
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addHeaders(response);
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}
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public static void addHeaders(HttpServletResponse response) {
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response.addHeader("X-Powered-By", POWERED_BY);
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response.addHeader("X-Patreon", "Support us on http://plantuml.com/patreon");
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response.addHeader("X-Donate", "http://plantuml.com/paypal");
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}
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private String getContentType() {
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return CONTENT_TYPE.get(format);
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}
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}
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