cgiservlet.java

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     * @exception  IOException  if a write operation exception occurs
     *
     */
    protected void printServletEnvironment(ServletOutputStream out,
        HttpServletRequest req, HttpServletResponse res) throws IOException {

        // Document the properties from ServletRequest
        out.println("<h1>ServletRequest Properties</h1>");
        out.println("<ul>");
        Enumeration attrs = req.getAttributeNames();
        while (attrs.hasMoreElements()) {
            String attr = (String) attrs.nextElement();
            out.println("<li><b>attribute</b> " + attr + " = " +
                           req.getAttribute(attr));
        }
        out.println("<li><b>characterEncoding</b> = " +
                       req.getCharacterEncoding());
        out.println("<li><b>contentLength</b> = " +
                       req.getContentLength());
        out.println("<li><b>contentType</b> = " +
                       req.getContentType());
        Enumeration locales = req.getLocales();
        while (locales.hasMoreElements()) {
            Locale locale = (Locale) locales.nextElement();
            out.println("<li><b>locale</b> = " + locale);
        }
        Enumeration params = req.getParameterNames();
        while (params.hasMoreElements()) {
            String param = (String) params.nextElement();
            String values[] = req.getParameterValues(param);
            for (int i = 0; i < values.length; i++)
                out.println("<li><b>parameter</b> " + param + " = " +
                               values[i]);
        }
        out.println("<li><b>protocol</b> = " + req.getProtocol());
        out.println("<li><b>remoteAddr</b> = " + req.getRemoteAddr());
        out.println("<li><b>remoteHost</b> = " + req.getRemoteHost());
        out.println("<li><b>scheme</b> = " + req.getScheme());
        out.println("<li><b>secure</b> = " + req.isSecure());
        out.println("<li><b>serverName</b> = " + req.getServerName());
        out.println("<li><b>serverPort</b> = " + req.getServerPort());
        out.println("</ul>");
        out.println("<hr>");

        // Document the properties from HttpServletRequest
        out.println("<h1>HttpServletRequest Properties</h1>");
        out.println("<ul>");
        out.println("<li><b>authType</b> = " + req.getAuthType());
        out.println("<li><b>contextPath</b> = " +
                       req.getContextPath());
        Cookie cookies[] = req.getCookies();
        if (cookies!=null) {
            for (int i = 0; i < cookies.length; i++)
                out.println("<li><b>cookie</b> " + cookies[i].getName() +" = " +cookies[i].getValue());
        }
        Enumeration headers = req.getHeaderNames();
        while (headers.hasMoreElements()) {
            String header = (String) headers.nextElement();
            out.println("<li><b>header</b> " + header + " = " +
                           req.getHeader(header));
        }
        out.println("<li><b>method</b> = " + req.getMethod());
        out.println("<li><a name=\"pathInfo\"><b>pathInfo</b></a> = "
                    + req.getPathInfo());
        out.println("<li><b>pathTranslated</b> = " +
                       req.getPathTranslated());
        out.println("<li><b>queryString</b> = " +
                       req.getQueryString());
        out.println("<li><b>remoteUser</b> = " +
                       req.getRemoteUser());
        out.println("<li><b>requestedSessionId</b> = " +
                       req.getRequestedSessionId());
        out.println("<li><b>requestedSessionIdFromCookie</b> = " +
                       req.isRequestedSessionIdFromCookie());
        out.println("<li><b>requestedSessionIdFromURL</b> = " +
                       req.isRequestedSessionIdFromURL());
        out.println("<li><b>requestedSessionIdValid</b> = " +
                       req.isRequestedSessionIdValid());
        out.println("<li><b>requestURI</b> = " +
                       req.getRequestURI());
        out.println("<li><b>servletPath</b> = " +
                       req.getServletPath());
        out.println("<li><b>userPrincipal</b> = " +
                       req.getUserPrincipal());
        out.println("</ul>");
        out.println("<hr>");

        // Document the servlet request attributes
        out.println("<h1>ServletRequest Attributes</h1>");
        out.println("<ul>");
        attrs = req.getAttributeNames();
        while (attrs.hasMoreElements()) {
            String attr = (String) attrs.nextElement();
            out.println("<li><b>" + attr + "</b> = " +
                           req.getAttribute(attr));
        }
        out.println("</ul>");
        out.println("<hr>");

        // Process the current session (if there is one)
        HttpSession session = req.getSession(false);
        if (session != null) {

            // Document the session properties
            out.println("<h1>HttpSession Properties</h1>");
            out.println("<ul>");
            out.println("<li><b>id</b> = " +
                           session.getId());
            out.println("<li><b>creationTime</b> = " +
                           new Date(session.getCreationTime()));
            out.println("<li><b>lastAccessedTime</b> = " +
                           new Date(session.getLastAccessedTime()));
            out.println("<li><b>maxInactiveInterval</b> = " +
                           session.getMaxInactiveInterval());
            out.println("</ul>");
            out.println("<hr>");

            // Document the session attributes
            out.println("<h1>HttpSession Attributes</h1>");
            out.println("<ul>");
            attrs = session.getAttributeNames();
            while (attrs.hasMoreElements()) {
                String attr = (String) attrs.nextElement();
                out.println("<li><b>" + attr + "</b> = " +
                               session.getAttribute(attr));
            }
            out.println("</ul>");
            out.println("<hr>");

        }

        // Document the servlet configuration properties
        out.println("<h1>ServletConfig Properties</h1>");
        out.println("<ul>");
        out.println("<li><b>servletName</b> = " +
                       getServletConfig().getServletName());
        out.println("</ul>");
        out.println("<hr>");

        // Document the servlet configuration initialization parameters
        out.println("<h1>ServletConfig Initialization Parameters</h1>");
        out.println("<ul>");
        params = getServletConfig().getInitParameterNames();
        while (params.hasMoreElements()) {
            String param = (String) params.nextElement();
            String value = getServletConfig().getInitParameter(param);
            out.println("<li><b>" + param + "</b> = " + value);
        }
        out.println("</ul>");
        out.println("<hr>");

        // Document the servlet context properties
        out.println("<h1>ServletContext Properties</h1>");
        out.println("<ul>");
        out.println("<li><b>majorVersion</b> = " +
                       getServletContext().getMajorVersion());
        out.println("<li><b>minorVersion</b> = " +
                       getServletContext().getMinorVersion());
        out.println("<li><b>realPath('/')</b> = " +
                       getServletContext().getRealPath("/"));
        out.println("<li><b>serverInfo</b> = " +
                       getServletContext().getServerInfo());
        out.println("</ul>");
        out.println("<hr>");

        // Document the servlet context initialization parameters
        out.println("<h1>ServletContext Initialization Parameters</h1>");
        out.println("<ul>");
        params = getServletContext().getInitParameterNames();
        while (params.hasMoreElements()) {
            String param = (String) params.nextElement();
            String value = getServletContext().getInitParameter(param);
            out.println("<li><b>" + param + "</b> = " + value);
        }
        out.println("</ul>");
        out.println("<hr>");

        // Document the servlet context attributes
        out.println("<h1>ServletContext Attributes</h1>");
        out.println("<ul>");
        attrs = getServletContext().getAttributeNames();
        while (attrs.hasMoreElements()) {
            String attr = (String) attrs.nextElement();
            out.println("<li><b>" + attr + "</b> = " +
                           getServletContext().getAttribute(attr));
        }
        out.println("</ul>");
        out.println("<hr>");



    }



    /**
     * Provides CGI Gateway service -- delegates to <code>doGet</code>
     *
     * @param  req   HttpServletRequest passed in by servlet container
     * @param  res   HttpServletResponse passed in by servlet container
     *
     * @exception  ServletException  if a servlet-specific exception occurs
     * @exception  IOException  if a read/write exception occurs
     *
     * @see javax.servlet.http.HttpServlet
     *
     */
    protected void doPost(HttpServletRequest req, HttpServletResponse res)
        throws IOException, ServletException {
        doGet(req, res);
    }



    /**
     * Provides CGI Gateway service
     *
     * @param  req   HttpServletRequest passed in by servlet container
     * @param  res   HttpServletResponse passed in by servlet container
     *
     * @exception  ServletException  if a servlet-specific exception occurs
     * @exception  IOException  if a read/write exception occurs
     *
     * @see javax.servlet.http.HttpServlet
     *
     */
    protected void doGet(HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException {

        // Verify that we were not accessed using the invoker servlet
        if (req.getAttribute(Globals.INVOKED_ATTR) != null)
            throw new UnavailableException
                ("Cannot invoke CGIServlet through the invoker");

        CGIEnvironment cgiEnv = new CGIEnvironment(req, getServletContext());

        if (cgiEnv.isValid()) {
            CGIRunner cgi = new CGIRunner(cgiEnv.getCommand(),
                                          cgiEnv.getEnvironment(),
                                          cgiEnv.getWorkingDirectory(),
                                          cgiEnv.getParameters());
            //if POST, we need to cgi.setInput
            //REMIND: how does this interact with Servlet API 2.3's Filters?!
            if ("POST".equals(req.getMethod())) {
                cgi.setInput(req.getInputStream());
            }
            cgi.setResponse(res);
            cgi.run();
        }

        if (!cgiEnv.isValid()) {
            res.setStatus(404);
        }
 
        if (debug >= 10) {
            try {
                ServletOutputStream out = res.getOutputStream();
                out.println("<HTML><HEAD><TITLE>$Name$</TITLE></HEAD>");
                out.println("<BODY>$Header$<p>");

                if (cgiEnv.isValid()) {
                    out.println(cgiEnv.toString());
                } else {
                    out.println("<H3>");
                    out.println("CGI script not found or not specified.");
                    out.println("</H3>");
                    out.println("<H4>");
                    out.println("Check the <b>HttpServletRequest ");
                    out.println("<a href=\"#pathInfo\">pathInfo</a></b> ");
                    out.println("property to see if it is what you meant ");
                    out.println("it to be.  You must specify an existant ");
                    out.println("and executable file as part of the ");
                    out.println("path-info.");
                    out.println("</H4>");
                    out.println("<H4>");
                    out.println("For a good discussion of how CGI scripts ");
                    out.println("work and what their environment variables ");
                    out.println("mean, please visit the <a ");
                    out.println("href=\"http://cgi-spec.golux.com\">CGI ");
                    out.println("Specification page</a>.");
                    out.println("</H4>");

                }

                printServletEnvironment(out, req, res);

                out.println("</BODY></HTML>");

            } catch (IOException ignored) {
            }

        } //debugging


    } //doGet



    /** For future testing use only; does nothing right now */
    public static void main(String[] args) {
        System.out.println("$Header$");
    }

    /**
     * Get all shell environment variables. Have to do it this rather ugly way
     * as the API to obtain is not available in 1.4 and earlier APIs.
     *
     * See <a href="http://www.rgagnon.com/javadetails/java-0150.html">Read environment
     * variables from an application</a> for original source and article.
     */
    private Hashtable getShellEnvironment() throws IOException {
        Hashtable envVars = new Hashtable();
        Process p = null;
        Runtime r = Runtime.getRuntime();
        String OS = System.getProperty("os.name").toLowerCase();
        boolean ignoreCase;

        if (OS.indexOf("windows 9") > -1) {
            p = r.exec( "command.com /c set" );
            ignoreCase = true;
        } else if ( (OS.indexOf("nt") > -1)
                || (OS.indexOf("windows 20") > -1)
                || (OS.indexOf("windows xp") > -1) ) {
            // thanks to JuanFran for the xp fix!
            p = r.exec( "cmd.exe /c set" );
            ignoreCase = true;
        } else {
            // our last hope, we assume Unix (thanks to H. Ware for the fix)
            p = r.exec( "env" );
            ignoreCase = false;
        }

        BufferedReader br = new BufferedReader
            ( new InputStreamReader( p.getInputStream() ) );
        String line;
        while( (line = br.readLine()) != null ) {
            int idx = line.indexOf( '=' );
            String key = line.substring( 0, idx );
            String value = line.substring( idx+1 );
            if (ignoreCase) {
                key = key.toUpperCase();
            }
            envVars.put(key, value);
        }
        return envVars;
    }