mirror of
https://github.com/octoleo/plantuml-server.git
synced 2024-09-22 12:09:03 +00:00
260 lines
9.4 KiB
Java
260 lines
9.4 KiB
Java
/* ========================================================================
|
|
* PlantUML : a free UML diagram generator
|
|
* ========================================================================
|
|
*
|
|
* Project Info: https://plantuml.com
|
|
*
|
|
* This file is part of PlantUML.
|
|
*
|
|
* PlantUML is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* PlantUML distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
* License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
|
|
* USA.
|
|
*/
|
|
package net.sourceforge.plantuml.servlet;
|
|
|
|
import java.io.ByteArrayOutputStream;
|
|
import java.io.IOException;
|
|
import java.io.PrintWriter;
|
|
import java.util.Collections;
|
|
import java.util.HashMap;
|
|
import java.util.Map;
|
|
|
|
import jakarta.servlet.http.HttpServletRequest;
|
|
import jakarta.servlet.http.HttpServletResponse;
|
|
|
|
import net.sourceforge.plantuml.BlockUml;
|
|
import net.sourceforge.plantuml.ErrorUml;
|
|
import net.sourceforge.plantuml.FileFormat;
|
|
import net.sourceforge.plantuml.FileFormatOption;
|
|
import net.sourceforge.plantuml.NullOutputStream;
|
|
import net.sourceforge.plantuml.OptionFlags;
|
|
import net.sourceforge.plantuml.SourceStringReader;
|
|
import net.sourceforge.plantuml.StringUtils;
|
|
import net.sourceforge.plantuml.code.Base64Coder;
|
|
import net.sourceforge.plantuml.core.Diagram;
|
|
import net.sourceforge.plantuml.core.DiagramDescription;
|
|
import net.sourceforge.plantuml.core.ImageData;
|
|
import net.sourceforge.plantuml.error.PSystemError;
|
|
import net.sourceforge.plantuml.version.Version;
|
|
|
|
/**
|
|
* Delegates the diagram generation from the UML source and the filling of the HTTP response with the diagram in the
|
|
* right format. Its own responsibility is to produce the right HTTP headers.
|
|
*/
|
|
public class DiagramResponse {
|
|
|
|
/**
|
|
* {@link FileFormat} to http content type mapping.
|
|
*/
|
|
private static final Map<FileFormat, String> CONTENT_TYPE;
|
|
/**
|
|
* X-Powered-By http header value included in every response by default.
|
|
*/
|
|
private static final String POWERED_BY = "PlantUML Version " + Version.versionString();
|
|
|
|
static {
|
|
OptionFlags.ALLOW_INCLUDE = false;
|
|
if ("true".equalsIgnoreCase(System.getenv("ALLOW_PLANTUML_INCLUDE"))) {
|
|
OptionFlags.ALLOW_INCLUDE = true;
|
|
}
|
|
CONTENT_TYPE = Collections.unmodifiableMap(new HashMap<FileFormat, String>() {{
|
|
put(FileFormat.PNG, "image/png");
|
|
put(FileFormat.SVG, "image/svg+xml");
|
|
put(FileFormat.EPS, "application/postscript");
|
|
put(FileFormat.UTXT, "text/plain;charset=UTF-8");
|
|
put(FileFormat.BASE64, "text/plain; charset=x-user-defined");
|
|
}});
|
|
}
|
|
|
|
/**
|
|
* Response format.
|
|
*/
|
|
private FileFormat format;
|
|
/**
|
|
* Http request.
|
|
*/
|
|
private HttpServletRequest request;
|
|
/**
|
|
* Http response.
|
|
*/
|
|
private HttpServletResponse response;
|
|
|
|
/**
|
|
* Create new diagram response instance.
|
|
*
|
|
* @param res http response
|
|
* @param fmt target file format
|
|
* @param req http request
|
|
*/
|
|
public DiagramResponse(HttpServletResponse res, FileFormat fmt, HttpServletRequest req) {
|
|
response = res;
|
|
format = fmt;
|
|
request = req;
|
|
}
|
|
|
|
/**
|
|
* Render and send a specific uml diagram.
|
|
*
|
|
* @param uml textual UML diagram(s) source
|
|
* @param idx diagram index of {@code uml} to send
|
|
*
|
|
* @throws IOException if an input or output exception occurred
|
|
*/
|
|
public void sendDiagram(String uml, int idx) throws IOException {
|
|
response.addHeader("Access-Control-Allow-Origin", "*");
|
|
response.setContentType(getContentType());
|
|
SourceStringReader reader = new SourceStringReader(uml);
|
|
if (format == FileFormat.BASE64) {
|
|
byte[] imageBytes;
|
|
try (ByteArrayOutputStream outstream = new ByteArrayOutputStream()) {
|
|
reader.outputImage(outstream, idx, new FileFormatOption(FileFormat.PNG));
|
|
imageBytes = outstream.toByteArray();
|
|
}
|
|
final String base64 = Base64Coder.encodeLines(imageBytes).replaceAll("\\s", "");
|
|
final String encodedBytes = "data:image/png;base64," + base64;
|
|
response.getOutputStream().write(encodedBytes.getBytes());
|
|
return;
|
|
}
|
|
final BlockUml blockUml = reader.getBlocks().get(0);
|
|
if (notModified(blockUml)) {
|
|
addHeaderForCache(blockUml);
|
|
response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
|
|
return;
|
|
}
|
|
if (StringUtils.isDiagramCacheable(uml)) {
|
|
addHeaderForCache(blockUml);
|
|
}
|
|
final Diagram diagram = blockUml.getDiagram();
|
|
if (diagram instanceof PSystemError) {
|
|
response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
|
|
}
|
|
diagram.exportDiagram(response.getOutputStream(), idx, new FileFormatOption(format));
|
|
}
|
|
|
|
/**
|
|
* Is block uml unmodified?
|
|
*
|
|
* @param blockUml block uml
|
|
*
|
|
* @return true if unmodified; otherwise false
|
|
*/
|
|
private boolean notModified(BlockUml blockUml) {
|
|
final String ifNoneMatch = request.getHeader("If-None-Match");
|
|
final long ifModifiedSince = request.getDateHeader("If-Modified-Since");
|
|
if (ifModifiedSince != -1 && ifModifiedSince != blockUml.lastModified()) {
|
|
return false;
|
|
}
|
|
final String etag = blockUml.etag();
|
|
if (ifNoneMatch == null) {
|
|
return false;
|
|
}
|
|
return ifNoneMatch.contains(etag);
|
|
}
|
|
|
|
/**
|
|
* Produce and send the image map of the uml diagram in HTML format.
|
|
*
|
|
* @param uml textual UML diagram source
|
|
* @param idx diagram index of {@code uml} to send
|
|
*
|
|
* @throws IOException if an input or output exception occurred
|
|
*/
|
|
public void sendMap(String uml, int idx) throws IOException {
|
|
if (idx < 0) {
|
|
idx = 0;
|
|
}
|
|
response.setContentType(getContentType());
|
|
SourceStringReader reader = new SourceStringReader(uml);
|
|
final BlockUml blockUml = reader.getBlocks().get(0);
|
|
if (StringUtils.isDiagramCacheable(uml)) {
|
|
addHeaderForCache(blockUml);
|
|
}
|
|
final Diagram diagram = blockUml.getDiagram();
|
|
ImageData map = diagram.exportDiagram(new NullOutputStream(), idx,
|
|
new FileFormatOption(FileFormat.PNG, false));
|
|
if (map.containsCMapData()) {
|
|
PrintWriter httpOut = response.getWriter();
|
|
final String cmap = map.getCMapData("plantuml");
|
|
httpOut.print(cmap);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check the syntax of the diagram and send a report in TEXT format.
|
|
*
|
|
* @param uml textual UML diagram source
|
|
*
|
|
* @throws IOException if an input or output exception occurred
|
|
*/
|
|
public void sendCheck(String uml) throws IOException {
|
|
response.setContentType(getContentType());
|
|
SourceStringReader reader = new SourceStringReader(uml);
|
|
DiagramDescription desc = reader.outputImage(
|
|
new NullOutputStream(),
|
|
new FileFormatOption(FileFormat.PNG, false)
|
|
);
|
|
PrintWriter httpOut = response.getWriter();
|
|
httpOut.print(desc.getDescription());
|
|
}
|
|
|
|
/**
|
|
* Add default header including cache headers to response.
|
|
*
|
|
* @param blockUml response block uml
|
|
*/
|
|
private void addHeaderForCache(BlockUml blockUml) {
|
|
long today = System.currentTimeMillis();
|
|
// Add http headers to force the browser to cache the image
|
|
final int maxAge = 3600 * 24 * 5;
|
|
response.addDateHeader("Expires", today + 1000L * maxAge);
|
|
response.addDateHeader("Date", today);
|
|
|
|
response.addDateHeader("Last-Modified", blockUml.lastModified());
|
|
response.addHeader("Cache-Control", "public, max-age=" + maxAge);
|
|
// response.addHeader("Cache-Control", "max-age=864000");
|
|
response.addHeader("Etag", "\"" + blockUml.etag() + "\"");
|
|
final Diagram diagram = blockUml.getDiagram();
|
|
response.addHeader("X-PlantUML-Diagram-Description", diagram.getDescription().getDescription());
|
|
if (diagram instanceof PSystemError) {
|
|
final PSystemError error = (PSystemError) diagram;
|
|
for (ErrorUml err : error.getErrorsUml()) {
|
|
response.addHeader("X-PlantUML-Diagram-Error", err.getError());
|
|
response.addHeader("X-PlantUML-Diagram-Error-Line", "" + err.getLineLocation().getPosition());
|
|
}
|
|
}
|
|
addHeaders(response);
|
|
}
|
|
|
|
/**
|
|
* Add default headers to response.
|
|
*
|
|
* @param response http response
|
|
*/
|
|
private static void addHeaders(HttpServletResponse response) {
|
|
response.addHeader("X-Powered-By", POWERED_BY);
|
|
response.addHeader("X-Patreon", "Support us on https://plantuml.com/patreon");
|
|
response.addHeader("X-Donate", "https://plantuml.com/paypal");
|
|
}
|
|
|
|
/**
|
|
* Get response content type.
|
|
*
|
|
* @return response content type
|
|
*/
|
|
private String getContentType() {
|
|
return CONTENT_TYPE.get(format);
|
|
}
|
|
|
|
}
|