connectionmanager.java

html to xml convertor

        throws
            ParserException
    {
        final String prefix = "file://localhost";
        String resource;
        URL url;
        StringBuffer buffer;
        URLConnection ret;

        try
        {
            url = new URL (fixSpaces (string));
            ret =  openConnection (url);
        }
        catch (MalformedURLException murle)
        {   // try it as a file
            try
            {
                File file = new File (string);
                resource = file.getCanonicalPath ();
                buffer = new StringBuffer (prefix.length ()
                    + resource.length ());
                buffer.append (prefix);
                if (!resource.startsWith ("/"))
                    buffer.append ("/");
                buffer.append (resource);
                url = new URL (fixSpaces (buffer.toString ()));
                ret = openConnection (url);
            }
            catch (MalformedURLException murle2)
            {
                String msg = "Error in opening a connection to " + string;
                ParserException ex = new ParserException (msg, murle2);
                throw ex;
            }
            catch (IOException ioe)
            {
                String msg = "Error in opening a connection to " + string;
                ParserException ex = new ParserException (msg, ioe);
                throw ex;
            }
        }

        return (ret);
    }

    /**
     * Generate a HTTP cookie header value string from the cookie jar.
     * <pre>
     *   The syntax for the header is:
     *
     *    cookie          =       "Cookie:" cookie-version
     *                            1*((";" | ",") cookie-value)
     *    cookie-value    =       NAME "=" VALUE [";" path] [";" domain]
     *    cookie-version  =       "$Version" "=" value
     *    NAME            =       attr
     *    VALUE           =       value
     *    path            =       "$Path" "=" value
     *    domain          =       "$Domain" "=" value
     *
     * </pre>
     * @param connection The connection being accessed.
     * @see <a href="http://www.ietf.org/rfc/rfc2109.txt">RFC 2109</a>
     * @see <a href="http://www.ietf.org/rfc/rfc2396.txt">RFC 2396</a>
     */
    public void addCookies (URLConnection connection)
    {
        Vector list;
        URL url;
        String host;
        String path;
        String domain;

        if (null != mCookieJar)
        {
            list = null;
            // get the site from the URL
            url = connection.getURL ();
            host = url.getHost ();
            path = url.getPath ();
            if (0 == path.length ())
                path = "/";
            if (null != host)
            {   // http://www.objectsdevelopment.com/portal/modules/freecontent/content/javawebserver.html
                list = addCookies ((Vector)mCookieJar.get (host), path, list);
                domain = getDomain (host);
                if (null != domain)
                    list = addCookies ((Vector)mCookieJar.get (domain),
                        path, list);
                else
                    // maybe it is the domain we're accessing
                    list = addCookies ((Vector)mCookieJar.get ("." + host),
                        path, list);
            }
            if (null != list)
                connection.setRequestProperty ("Cookie",
                    generateCookieProperty (list));
        }
    }

    /**
     * Add qualified cookies from cookies into list.
     * @param cookies The list of cookies to check (may be null).
     * @param path The path being accessed.
     * @param list The list of qualified cookies.
     * @return The list of qualified cookies.
     */
    protected Vector addCookies (Vector cookies, String path, Vector list)
    {
        Cookie cookie;
        Date expires;
        Date now;

        if (null != cookies)
        {
            now = new Date ();
            for (int i = 0; i < cookies.size (); i++)
            {
                cookie = (Cookie)cookies.elementAt (i);
                expires = cookie.getExpiryDate ();
                if ((null != expires) && expires.before (now))
                {
                    cookies.remove (i);
                    i--; // dick with the loop variable
                }
                else
                    if (path.startsWith (cookie.getPath ()))
                    {
                        if (null == list)
                            list = new Vector ();
                        list.addElement (cookie);
                    }
            }
        }
        
        return (list);
    }

    /**
     * Get the domain from a host.
     * @param host The supposed host name.
     * @return The domain (with the leading dot),
     * or null if the domain cannot be determined.
     */
    protected String getDomain (String host)
    {
        StringTokenizer tokenizer;
        int count;
        String server;
        int length;
        boolean ok;
        char c;
        String ret;
        
        ret = null;
        
        tokenizer = new StringTokenizer (host, ".");
        count = tokenizer.countTokens ();
        if (3 <= count)
        {
            // have at least two dots,
            // check if we were handed an IP address by mistake
            length = host.length ();
            ok = false;
            for (int i = 0; i < length && !ok; i++)
            {
                c = host.charAt (i);
                if (!(Character.isDigit (c) || (c == '.')))
                    ok = true;
            }
            if (ok)
            {
                // so take everything after the first token
                server = tokenizer.nextToken ();
                length = server.length ();
                ret = host.substring (length);
            }
        }

        return (ret);
    }

    /**
     * Creates the cookie request property value from the list of
     * valid cookies for the domain.
     * @param cookies The list of valid cookies to be encoded in the request.
     * @return A string suitable for inclusion as the value of
     * the "Cookie:" request property.
     */
    protected String generateCookieProperty (Vector cookies)
    {
        int version;
        Cookie cookie;
        StringBuffer buffer;
        String ret;
        
        ret = null;

        buffer = new StringBuffer ();
        version = 0;
        for (int i = 0; i < cookies.size (); i++)
            version = Math.max (version,
                ((Cookie)cookies.elementAt (i)).getVersion ());
        if (0 != version)
        {
            buffer.append ("$Version=\"");
            buffer.append (version);
            buffer.append ("\"");
        }
        for (int i = 0; i < cookies.size (); i++)
        {
            cookie = (Cookie)cookies.elementAt (i);
            if (0 != buffer.length ())
                buffer.append ("; ");
            buffer.append (cookie.getName ());
            buffer.append (cookie.getName ().equals ("") ? "" : "=");
            if (0 != version)
                buffer.append ("\"");
            buffer.append (cookie.getValue ());
            if (0 != version)
                buffer.append ("\"");
            if (0 != version)
            {
                if ((null != cookie.getPath ())
                    && (0 != cookie.getPath ().length ()))
                {
                    buffer.append ("; $Path=\"");
                    buffer.append (cookie.getPath ());
                    buffer.append ("\"");
                }
                if ((null != cookie.getDomain ())
                    && (0 != cookie.getDomain ().length ()))
                {
                    buffer.append ("; $Domain=\"");
                    buffer.append (cookie.getDomain ());
                    buffer.append ("\"");
                }
            }
        }
        if (0 != buffer.length ())
            ret = buffer.toString ();

        return (ret);
    }
    
    /**
     * Check for cookie and parse into cookie jar.
     * @param connection The connection to extract cookie information from.
     */
    public void parseCookies (URLConnection connection)
    {
        String string;
        Vector cookies;
        StringTokenizer tokenizer;
        String token;
        int index;
        String name;
        String key;
        String value;
        Cookie cookie;
        
        string = connection.getHeaderField ("Set-Cookie");
        if (null != string)
        {
//            set-cookie      =       "Set-Cookie:" cookies
//            cookies         =       1#cookie
//            cookie          =       NAME "=" VALUE *(";" cookie-av)
//            NAME            =       attr
//            VALUE           =       value
//            cookie-av       =       "Comment" "=" value
//                            |       "Domain" "=" value
//                            |       "Max-Age" "=" value
//                            |       "Path" "=" value
//                            |       "Secure"
//                            |       "Version" "=" 1*DIGIT
            cookies = new Vector ();
            tokenizer = new StringTokenizer (string, ";,", true);
            cookie = null;
            while (tokenizer.hasMoreTokens ())
            {
                token = tokenizer.nextToken ().trim ();
                if (token.equals (";"))
                    continue;
                else if (token.equals (","))
                {
                    cookie = null;
                    continue;
                }
                    
                index = token.indexOf ('=');
                if (-1 == index)
                {
                    if (null == cookie)
                    {   // an unnamed cookie
                        name = "";
                        value = token;
                        key = name;
                    }
                    else
                    {
                        name = token;
                        value = null;
                        key = name.toLowerCase ();
                    }
                }
                else
                {
                    name = token.substring (0, index);
                    value = token.substring (index + 1);
                    key = name.toLowerCase ();
                }

                if (null == cookie)
                {
                    try
                    {
                        cookie = new Cookie (name, value);
                        cookies.addElement (cookie);
                    }
                    catch (IllegalArgumentException iae)
                    {
                        // should print a warning
                        // for now just bail
                        break;
                    }
                }
                else
                {
                    if (key.equals ("expires")) // Wdy, DD-Mon-YY HH:MM:SS GMT
                    {
                        String comma = tokenizer.nextToken ();
                        String rest = tokenizer.nextToken ();
                        try
                        {
                            Date date = mFormat.parse (value + comma + rest);
                            cookie.setExpiryDate (date);
                        }
                        catch (ParseException pe)
                        {
                            // ok now what
                            cookie.setExpiryDate (null);
                        }
                    }
                    else
                        if (key.equals ("domain"))
                            cookie.setDomain (value);
                        else
                            if (key.equals ("path"))
                                cookie.setPath (value);
                            else
                                if (key.equals ("secure"))
                                    cookie.setSecure (true);
                                else
                                    if (key.equals ("comment"))
                                        cookie.setComment (value);
                                    else
                                        if (key.equals ("version"))
                                            cookie.setVersion (
                                                Integer.parseInt (value));
                                        else
                                            if (key.equals ("max-age"))
                                            {
                                                Date date = new Date ();
                                                long then = date.getTime ()
                                                + Integer.parseInt (value)
                                                * 1000;
                                                date.setTime (then);
                                                cookie.setExpiryDate (date);
                                            }
                                            else
                                                // error,? unknown attribute,
                                                // maybe just another cookie
                                                // not separated by a comma
                                                try
                                                {
                                                    cookie = new Cookie (name,
                                                        value);
                                                    cookies.addElement (cookie);
                                                }
                                                catch (IllegalArgumentException iae)
                                                {
                                                    // should print a warning
                                                    // for now just bail
                                                    break;
                                                }
                }
           }
           if (0 != cookies.size ())
               saveCookies (cookies, connection);
        }
    }

    /**
     * Save the cookies received in the response header.
     * @param list The list of cookies extracted from the response header.
     * @param connection The connection (used when a cookie has no domain).
     */
    protected void saveCookies (Vector list, URLConnection connection)
    {
        Cookie cookie;
        String domain;

        for (int i = 0; i < list.size (); i++)
        {
            cookie = (Cookie)list.elementAt (i);
            domain = cookie.getDomain ();
            if (null == domain)
                domain = connection.getURL ().getHost ();
            setCookie (cookie, domain);
        }
    }
}