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• JNLPServlet.java

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com.viaoa.web.servlet.JNLPServlet Maven / Gradle / Ivy

/*  Copyright 1999 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.web.servlet;

import java.io.*;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;

import javax.servlet.*;
import javax.servlet.http.*;

import com.viaoa.util.OADateTime;
import com.viaoa.util.OAFile;
import com.viaoa.util.OAString;

/**
 * servlet used to serve up JNLP files, and dynamically set the codebase data, and other
 * information within the jnlp text file.
 * This will also rename any references to jar files to match the "versioned" name that is stored in
 * a jar directory.
 * @author vvia
 */
public class JNLPServlet extends HttpServlet
{
    private static final long serialVersionUID = 1L;
    private String webcontentDirectory;
    /** name/values to send to client app */
    private HashMap hmNameValue = new HashMap();
    private ConcurrentHashMap hmJnlp = new ConcurrentHashMap();

    public JNLPServlet() {
    }

    public void addNameValue(String name, String value) {
        hmNameValue.put(name, value);
    }

    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException
    {
        String s;

        resp.addHeader("Expires", "Fri, 15 May 2015 8:00:00 GMT");
        
        // Set standard HTTP/1.1 no-cache headers.
        resp.addHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers 
        resp.addHeader("Cache-Control", "post-check=0, pre-check=0");
        
        resp.setHeader("Pragma", "no-cache"); //HTTP 1.0
        resp.setDateHeader("Expires", 0); //prevents caching at the proxy server
        
        resp.setDateHeader("Last-Modified", (new OADateTime()).getTime());
        
        // ex:   "http://localhost:8082/jnlp/template.jnlp"
        /*
        s = req.getQueryString(); // null,  would be anything past "?"
        s = req.getServletPath(); // "/jnlp/template.jnlp
        s = req.getContextPath(); // ""
        s = req.getLocalAddr();
        s = req.getLocalName();
        s = req.getMethod();     // "GET"
        s = req.getPathInfo();  // "/template.jnlp"
        s = req.getRemoteAddr();
        s = req.getRemoteHost();
        s = req.getServletPath(); // "/jnlp/template.jnlp"
        s = req.getScheme();   // "http"
        s = req.getPathInfo();  // null
        s = req.getPathTranslated(); // null
        s = getServletContext().getServerInfo();  // jetty/7.6.0.v20120127
        s = getServletContext().getServletContextName(); // "/"
        s = getServletContext().getMajorVersion()+"";  // "2"
        s = req.getServerName();
        s = req.getLocalPort()+"";
        s = req.getProtocol(); //  "HTTP/1.1"
        s = req.getRealPath("test");  // "C:\Projects\java\gohifive\webcontent\test"
        s = req.getRequestURI();  // "/jnlp/testx.jnlp"
        s = req.getRequestURL()+"";  // "http://localhost:8082/jnlp/testrs.jnlp"
        */
        s = req.getRequestURL()+"";
        final String hostNameAndPort = OAString.field(s, "/", 3);
                

        String path = getServletContext().getContextPath(); // ""
        path = getServletContext().getRealPath(path);  // C:\Projects\java\Hifive\webcontent

        if (webcontentDirectory == null) {
            webcontentDirectory = path;
        }
        
        /*was 20160825
        String hostNameAndPort = req.getServerName();  // "localhost"
        int x = req.getLocalPort();  // 8082
        if (x > 0) hostNameAndPort += ":" + x;
        */
        
        String scheme = req.getScheme();
                
        String sURI = req.getRequestURI(); // "/jnlp/template.jnlp"
        String fname = (path + sURI);
        
        String query = req.getQueryString();

        String jnlpDir = sURI;
        int pos = jnlpDir.lastIndexOf('/');
        if (pos > 0) jnlpDir = jnlpDir.substring(0, pos); 
        
        String txt;
        try {
            txt = hmJnlp.get(fname);
            if (txt == null) { 
                txt = OAFile.readTextFile(fname, 2048);

                // convert the jar files names to the name with version.
                txt = updateJarFileNames(txt);
                hmJnlp.put(fname, txt);
                
            
                // codebase="http://localhost:8081/jnlp"  <== replace server:port with actual server
                pos = txt.indexOf("codebase");
                if (pos >= 0) {
                    pos = txt.indexOf("\"", pos);;
                    if (pos >= 0) {
                        int epos = txt.indexOf("\"", pos+1);;
                        if (epos >= 0 ) {
                            txt = txt.substring(0, pos+1) + scheme + "://" + (hostNameAndPort + jnlpDir) + txt.substring(epos);
                        }
                    }
                }
                hmJnlp.put(fname, txt);
            }
                
            // set client arguments[]
            //   find:  JWSCLIENT            
            pos = txt.indexOf("JWSCLIENT");
            String appTitle = null;
            
            if (pos >= 0) {
                s = "";

                HashSet hs = null;
                Enumeration enumx = req.getParameterNames();//AttributeNames();
                for ( ; enumx.hasMoreElements(); ) {
                    String n = (String) enumx.nextElement();
                    if (n == null) continue;
                    String[] vs = (String[]) req.getParameterValues(n);//Attribute(n);
                    String v;
                    if (vs == null || vs.length == 0 || vs[0] == null) v = "";
                    else v = vs[0];
                    s += n+"="+v+"";
                    if (hs == null) hs = new HashSet();
                    hs.add(n.toUpperCase());
                }
                
                for (Entry entry : hmNameValue.entrySet()) {
                    if ("jnlp.title".equalsIgnoreCase(entry.getKey())) {
                        appTitle = entry.getValue();
                    }
                    String n = entry.getKey();
                    if (n == null) continue;
                    if (hs != null && hs.contains(n.toUpperCase())) continue; // overwritten from query string 
                    String v = entry.getValue();
                    if (v == null) v = "";
                    
                    if ("server".equalsIgnoreCase(n)) {
                        v = OAString.field(hostNameAndPort, ":", 1);
                    }
                    
                    s += n+"="+v+"";
                }
                
                txt = txt.substring(0, pos) + s + txt.substring(pos);
            }      

            // 
            if (!OAString.isEmpty(appTitle)) {
                pos = txt.indexOf("", pos+1);;
                    if (epos >= 0 ) {
                        txt = txt.substring(0, pos) + "