/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* Project Info: http://plantuml.sourceforge.net
*
* 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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sourceforge.plantuml.BlockUml;
import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.SourceStringReader;
import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.core.UmlSource;
import java.security.cert.Certificate;
import java.util.List;
import javax.imageio.IIOException;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLPeerUnverifiedException;
/*
* Proxy servlet of the webapp.
* This servlet retrieves the diagram source of a web resource (web html page)
* and renders it.
*/
@SuppressWarnings("serial")
public class ProxyServlet extends HttpServlet {
private String format;
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
final String source = request.getParameter("src");
final String index = request.getParameter("idx");
final URL srcUrl;
// Check if the src URL is valid
try {
srcUrl = new URL(source);
} catch (MalformedURLException mue) {
mue.printStackTrace();
return;
}
// generate the response
String diagmarkup = getSource(srcUrl);
System.out.println("getSource=>" + diagmarkup);
SourceStringReader reader = new SourceStringReader(diagmarkup);
int n = index == null ? 0 : Integer.parseInt(index);
List<BlockUml> blocks = reader.getBlocks();
BlockUml block = blocks.get(n);
Diagram diagram = block.getDiagram();
UmlSource umlSrc = diagram.getSource();
String uml = umlSrc.getPlainString();
System.out.println("uml=" + uml);
// generate the response
DiagramResponse dr = new DiagramResponse(response, getOutputFormat());
try {
dr.sendDiagram(uml);
} catch (IIOException iioe) {
// Browser has closed the connection, so the HTTP OutputStream is closed
// Silently catch the exception to avoid annoying log
}
dr = null;
}
private String getSource(final URL url) throws IOException {
String line;
BufferedReader rd;
StringBuilder sb;
try {
HttpURLConnection con = getConnection(url);
rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
sb = new StringBuilder();
while ((line = rd.readLine()) != null) {
sb.append(line + '\n');
}
rd.close();
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
} finally {
rd = null;
}
return "";
}
private FileFormat getOutputFormat() {
if (format == null) {
return FileFormat.PNG;
}
if (format.equals("svg")) {
return FileFormat.SVG;
}
if (format.equals("txt")) {
return FileFormat.UTXT;
}
return FileFormat.PNG;
}
private HttpURLConnection getConnection(final URL url) throws IOException {
if (url.getProtocol().startsWith("https")) {
HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
con.setRequestMethod("GET");
con.setReadTimeout(10000); // 10 seconds
// printHttpsCert(con);
con.connect();
return con;
} else {
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
con.setReadTimeout(10000); // 10 seconds
con.connect();
return con;
}
}
/**
* Debug method used to dump the certificate info
* @param con the https connection
*/
@SuppressWarnings("unused")
private void printHttpsCert(final HttpsURLConnection con) {
if (con != null) {
try {
System.out.println("Response Code : " + con.getResponseCode());
System.out.println("Cipher Suite : " + con.getCipherSuite());
System.out.println("\n");
Certificate[] certs = con.getServerCertificates();
for (Certificate cert : certs) {
System.out.println("Cert Type : " + cert.getType());
System.out.println("Cert Hash Code : " + cert.hashCode());
System.out.println("Cert Public Key Algorithm : " + cert.getPublicKey().getAlgorithm());
System.out.println("Cert Public Key Format : " + cert.getPublicKey().getFormat());
System.out.println("\n");
}
} catch (SSLPeerUnverifiedException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}