<?php
/*

    hacked in places by cal henderson
    now supports timing out, which php sucks at
    (C)2004, Cal Henderson <cal@iamcal.com>


   Net_HTTP_Client class
    
@DESCRIPTION 

   HTTP Client component
    suppots methods HEAD, GET, POST
    1.0 and 1.1 compliant
    WebDAV methods tested against Apache/mod_dav
    Documentation @ http://lwest.free.fr/doc/php/lib/net_http_client-en.html
    
@SYNOPSIS

    include "Net/HTTP/Client.php";

    $http = new Net_HTTP_Client();
    $http->connect( "localhost", 80 ) or die( "connect problem" );
    $status = $http->get( "/index.html" );
    if( $status != 200 )
        die( "Problem : " . $http->getStatusMessage() . "\n" );
    $http->disconnect();

    

@CHANGES
    0.1 initial version
    0.2 documentation completed
        + getHeaders(), getBody()
         o Post(), Connect()
    0.3 DAV enhancements:
         + Put() method
    0.4 continued DAV support 
         + Delete(), Move(), MkCol(), Propfind()  methods
         o added url property, remove host and port properties
         o Connect, Net_HTTP_Client (use of this.url)
         o processBody() : use non-blocking to fix a socket pblm
    0.5 debug support
         + setDebug()
         + debug levels definitions (DBG*)
    0.6 + Lock() method
         + setCredentials() method and fix - thanks Thomas Olsen
         + support for Get( full_url )
         o fix POST call (duplicate content-length) - thanks to Javier Sixto
    0.7 + OPTIONS method support
        + addCookie and removeCookies methods
        o fix the "0" problem
        o undeifned variable warning fixed
        
    
@VERSION
    0.7
    
@INFORMATIONS

 Compatibility : PHP 4 >= 4.0b4
         created : May 2001
  LastModified : Sep 2002


@AUTHOR
    Leo West <west_leo@yahoo-REMOVE-.com>

@TODO
    remaining WebDAV methods: UNLOCK PROPPATCH
    
    
*/


/// debug levels , use it as Client::setDebug( DBGSOCK & DBGTRACE )
define( "DBGTRACE", 1 ); // to debug methods calls
define( "DBGINDATA", 2 ); // to debug data received
define( "DBGOUTDATA", 4 ); // to debug data sent
define( "DBGLOW", 8 ); // to debug low-level (usually internal) methods
define( "DBGSOCK", 16 ); // to debug socket-level code

/// internal errors
define( "ECONNECTION", -1 ); // connection failed
define( "EBADRESPONSE", -2 ); // response status line is not http compliant

define( "CRLF", "\r\n" );


class http_client 
{

    // @private
    /// array containg server URL, similar to array returned by parseurl()
    var $url; 
    /// server response code eg. "304"
    var $reply;
    /// server response line eg. "200 OK"
    var $replyString;
    /// HTPP protocol version used
    var $protocolVersion = "1.0";    
    /// internal buffers
    var $requestHeaders, $requestBody;
    /// TCP socket identifier
    var $socket = false;
    /// proxy informations
    var $useProxy = false;
    var $proxyHost, $proxyPort;
    /// debugging flag
    var $debug = 0;
        
    /**
     * Net_HTTP_Client
     * constructor
     * Note : when host and port are defined, the connection is immediate
     * @seeAlso connect
     **/    
    function http_client( $host= NULL, $port= NULL )
    {
        if( $this->debug & DBGTRACE ) echo "Net_HTTP_Client( $host, $port )\n";
            
        if( $host != NULL ) {
            $this->connect( $host, $port );
        }
    }

    /**
     * turn on debug messages
     * @param level a combinaison of debug flags
     * @see debug flags ( DBG..) defined at top of file
     **/    
    function setDebug( $level )
    {
        if( $this->debug & DBGTRACE ) echo "setDebug( $level )\n";
        $this->debug = $level;
    }
    
        
    /**
     * turn on proxy support
     * @param proxyHost proxy host address eg "proxy.mycorp.com"
     * @param proxyPort proxy port usually 80 or 8080
     **/    
    function setProxy( $proxyHost, $proxyPort )
    {
        if( $this->debug & DBGTRACE ) echo "setProxy( $proxyHost, $proxyPort )\n";
        $this->useProxy = true;
        $this->proxyHost = $proxyHost;
        $this->proxyPort = $proxyPort;
    }
    
        
    /**
     * setProtocolVersion
     * define the HTTP protocol version to use
     *    @param version string the version number with one decimal: "0.9", "1.0", "1.1"
     * when using 1.1, you MUST set the mandatory headers "Host"
     * @return boolean false if the version number is bad, true if ok
     **/    
    function setProtocolVersion( $version )
    {
        if( $this->debug & DBGTRACE ) echo "setProtocolVersion( $version )\n";
            
        if( $version > 0 and $version <= 1.1 ) {
            $this->protocolVersion = $version;
            return true;
        } else {
            return false;
        }
    }

    /**
     * set a username and password to access a protected resource
     * Only "Basic" authentication scheme is supported yet
     *    @param username string - identifier
     *    @param password string - clear password
     **/
    function setCredentials( $username, $password )
    {
        $hdrvalue = base64_encode( "$username:$password" );
        $this->addHeader( "Authorization", "Basic $hdrvalue" );
    }
    
    /**
     * define a set of HTTP headers to be sent to the server
     * header names are lowercased to avoid duplicated headers
     *    @param headers hash array containing the headers as headerName => headerValue pairs
     **/    
    function setHeaders( $headers )
    {
        if( $this->debug & DBGTRACE ) echo "setHeaders( $headers ) \n";
        if( is_array( $headers )) {
            foreach( $headers as $name => $value ) {
                $this->requestHeaders[$name] = $value;
            }
        }
    }
    
    /**
     * addHeader
     * set a unique request header
     *    @param headerName the header name
     *    @param headerValue the header value, ( unencoded)
     **/    
    function addHeader( $headerName, $headerValue )
    {
        if( $this->debug & DBGTRACE ) echo "addHeader( $headerName, $headerValue )\n";
        $this->requestHeaders[$headerName] = $headerValue;
    }

    /**
     * removeHeader
     * unset a request header
     *    @param headerName the header name
     **/    
    function removeHeader( $headerName ) 
    {
        if( $this->debug & DBGTRACE )    echo "removeHeader( $headerName) \n";
        unset( $this->requestHeaders[$headerName] );
    }

    /**
     * addCookie
     * set a session cookie, that will be used in the next requests.
     * this is a hack as cookie are usually set by the server, but you may need it 
     * it is your responsabilty to unset the cookie if you request another host
     * to keep a session on the server
     *    @param string the name of the cookie
     *    @param string the value for the cookie
     **/    
    function addCookie( $cookiename, $cookievalue ) 
    {
        if( $this->debug & DBGTRACE )    echo "addCookie( $cookiename, $cookievalue ) \n";
        $cookie = $cookiename . "=" . $cookievalue;
        $this->requestHeaders["Cookie"] = $cookie;
    }

    /**
     * removeCookie
     * unset cookies currently in use
     **/    
    function removeCookies() 
    {
        if( $this->debug & DBGTRACE )    echo "removeCookies() \n";
        unset( $this->requestHeaders["Cookie"] );
    }

    /**
     * Connect
     * open the connection to the server
     * @param host string server address (or IP)
     * @param port string server listening port - defaults to 80
     * @return boolean false is connection failed, true otherwise
     **/
    function Connect( $host, $port = NULL ) 
    {
        if( $this->debug & DBGTRACE ) echo "Connect( $host, $port ) \n";
        
        $this->url['scheme'] = "http";
        $this->url['host'] = $host;
        if( $port != NULL )
            $this->url['port'] = $port;
        return true;
    }

    /**
     * Disconnect
     * close the connection to the  server
     **/
    function Disconnect() 
    {
        if( $this->debug & DBGTRACE ) echo "Disconnect()\n";
        if( $this->socket )
            fclose( $this->socket );
    }

    /**
     * head
     * issue a HEAD request
     * @param uri string URI of the document
     * @return string response status code (200 if ok)
     * @seeAlso getHeaders()
     **/
    function Head( $uri )
    {
        if( $this->debug & DBGTRACE ) echo "Head( $uri )\n";
        $this->responseHeaders = $this->responseBody = "";
        $uri = $this->makeUri( $uri );
        if( $this->sendCommand( "HEAD $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }
    
    
    /**
     * get
     * issue a GET http request
     * @param uri URI (path on server) or full URL of the document
     * @return string response status code (200 if ok)
     * @seeAlso getHeaders(), getBody()
     **/
    function Get( $url )
    {
        if( $this->debug & DBGTRACE ) echo "Get( $url )\n";
        $this->responseHeaders = $this->responseBody = "";
        $uri = $this->makeUri( $url );
        
        if( $this->sendCommand( "GET $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }
    
    /**
     * Options
     * issue a OPTIONS http request
     * @param uri URI (path on server) or full URL of the document
     * @return array list of options supported by the server or NULL in case of error
     **/
    function Options( $url )
    {
        if( $this->debug & DBGTRACE ) echo "Options( $url )\n";
        $this->responseHeaders = $this->responseBody = "";
        $uri = $this->makeUri( $url );
        
        if( $this->sendCommand( "OPTIONS $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        if( @$this->responseHeaders["Allow"] == NULL )
            return NULL; 
        else
            return explode( ",", $this->responseHeaders["Allow"] );
    }
    
    /**
     * Post
     * issue a POST http request
     * @param uri string URI of the document
     * @param query_params array parameters to send in the form "parameter name" => value
     * @return string response status code (200 if ok)
     * @example 
     *   $params = array( "login" => "tiger", "password" => "secret" );
     *   $http->post( "/login.php", $params );
     **/
    function Post( $uri, $query_params="" )
    {
        if( $this->debug & DBGTRACE ) echo "Post( $uri, $query_params )\n";
        $uri = $this->makeUri( $uri );
        if( is_array($query_params) ) {
            $postArray = array();
            foreach( $query_params as $k=>$v ) {
                $postArray[] = urlencode($k) . "=" . urlencode($v);
            }
            $this->requestBody = implode( "&", $postArray);
        }
        // set the content type for post parameters
        $this->addHeader( 'Content-Type', "application/x-www-form-urlencoded" );
// done in sendCommand()        $this->addHeader( 'Content-Length', strlen($this->requestBody) );

        if( $this->sendCommand( "POST $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        $this->removeHeader('Content-Type');
        $this->removeHeader('Content-Length');
        $this->requestBody = "";
        return $this->reply;
    }

    /**
     * Put
     * Send a PUT request
     * PUT is the method to sending a file on the server. it is *not* widely supported
     * @param uri the location of the file on the server. dont forget the heading "/"
     * @param filecontent the content of the file. binary content accepted
     * @return string response status code 201 (Created) if ok
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function Put( $uri, $filecontent )
    {
        if( $this->debug & DBGTRACE ) echo "Put( $uri, [filecontent not displayed )\n";
        $uri = $this->makeUri( $uri );
        $this->requestBody = $filecontent;
        if( $this->sendCommand( "PUT $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }
        
    /**
     * Send a MOVE HTTP-DAV request
     * Move (rename) a file on the server
     * @param srcUri the current file location on the server. dont forget the heading "/"
     * @param destUri the destination location on the server. this is *not* a full URL
     * @param overwrite boolean - true to overwrite an existing destinationn default if yes
     * @return string response status code 204 (Unchanged) if ok
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function Move( $srcUri, $destUri, $overwrite=true )
    {
        if( $this->debug & DBGTRACE ) echo "Move( $srcUri, $destUri, $overwrite )\n";
        if( $overwrite )
            $this->requestHeaders['Overwrite'] = "T";
        else
            $this->requestHeaders['Overwrite'] = "F";
        
        $destUrl = $this->url['scheme'] . "://" . $this->url['host'];
        if( $this->url['port'] != "" )
            $destUrl .= ":" . $this->url['port'];
        $destUrl .= $destUri;
        $this->requestHeaders['Destination'] =  $destUrl;
        
        if( $this->sendCommand( "MOVE $srcUri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }

    /**
     * Send a COPY HTTP-DAV request
     * Copy a file -allready on the server- into a new location
     * @param srcUri the current file location on the server. dont forget the heading "/"
     * @param destUri the destination location on the server. this is *not* a full URL
     * @param overwrite boolean - true to overwrite an existing destination - overwrite by default
     * @return string response status code 204 (Unchanged) if ok
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function Copy( $srcUri, $destUri, $overwrite=true )
    {
        if( $this->debug & DBGTRACE ) echo "Copy( $srcUri, $destUri, $overwrite )\n";
        if( $overwrite )
            $this->requestHeaders['Overwrite'] = "T";
        else
            $this->requestHeaders['Overwrite'] = "F";
        
        $destUrl = $this->url['scheme'] . "://" . $this->url['host'];
        if( $this->url['port'] != "" )
            $destUrl .= ":" . $this->url['port'];
        $destUrl .= $destUri;
        $this->requestHeaders['Destination'] =  $destUrl;
        
        if( $this->sendCommand( "COPY $srcUri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }


    /**
     * Send a MKCOL HTTP-DAV request
     * Create a collection (directory) on the server
     * @param uri the directory location on the server. dont forget the heading "/"
     * @return string response status code 201 (Created) if ok
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function MkCol( $uri )
    {
        if( $this->debug & DBGTRACE ) echo "Mkcol( $uri )\n";
        // $this->requestHeaders['Overwrite'] = "F";        
        if( $this->sendCommand( "MKCOL $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }

    /**
     * Delete a file on the server using the "DELETE" HTTP-DAV request
     * This HTTP method is *not* widely supported
     * Only partially supports "collection" deletion, as the XML response is not parsed
     * @param uri the location of the file on the server. dont forget the heading "/"
     * @return string response status code 204 (Unchanged) if ok
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function Delete( $uri )
    {
        if( $this->debug & DBGTRACE ) echo "Delete( $uri )\n";
        if( $this->sendCommand( "DELETE $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }

    /**
     * PropFind
     * implements the PROPFIND method
     * PROPFIND retrieves meta informations about a resource on the server
     * XML reply is not parsed, you'll need to do it
     * @param uri the location of the file on the server. dont forget the heading "/"
     * @param scope set the scope of the request. 
     *         O : infos about the node only
     *         1 : infos for the node and its direct children ( one level)
     *         Infinity : infos for the node and all its children nodes (recursive)
     * @return string response status code - 207 (Multi-Status) if OK
     * @see RFC2518 "HTTP Extensions for Distributed Authoring WEBDAV"
     **/
    function PropFind( $uri, $scope=0 )
    {
        if( $this->debug & DBGTRACE ) echo "Propfind( $uri, $scope )\n";
        $this->requestHeaders['Depth'] = $scope;
        if( $this->sendCommand( "PROPFIND $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }


    /**
     * Lock - WARNING: EXPERIMENTAL
     * Lock a ressource on the server. XML reply is not parsed, you'll need to do it
     * @param $uri URL (relative) of the resource to lock
     * @param $lockScope -  use "exclusive" for an eclusive lock, "inclusive" for a shared lock
     * @param $lockType - acces type of the lock : "write"
     * @param $lockScope -  use "exclusive" for an eclusive lock, "inclusive" for a shared lock     
     * @param $lockOwner - an url representing the owner for this lock
     * @return server reply code, 200 if ok
     **/
    function Lock( $uri, $lockScope, $lockType, $lockOwner )
    {
        $body = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>
<D:lockinfo xmlns:D='DAV:'>
<D:lockscope><D:$lockScope/></D:lockscope>\n<D:locktype><D:$lockType/></D:locktype>
    <D:owner><D:href>$lockOwner</D:href></D:owner>
</D:lockinfo>\n";
        
        $this->requestBody = utf8_encode( $body );
        if( $this->sendCommand( "LOCK $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }


    /**
     * Unlock - WARNING: EXPERIMENTAL
     * unlock a ressource on the server
     * @param $uri URL (relative) of the resource to unlock
     * @param $lockToken  the lock token given at lock time, eg: opaquelocktoken:e71d4fae-5dec-22d6-fea5-00a0c91e6be4
     * @return server reply code, 204 if ok
     **/
    function Unlock( $uri, $lockToken )
    {
        $this->addHeader( "Lock-Token", "<$lockToken>" );
        if( $this->sendCommand( "UNLOCK $uri HTTP/$this->protocolVersion" ) )
            $this->processReply();
        return $this->reply;
    }

    /**
     * getHeaders
     * return the response headers
     * to be called after a Get() or Head() call
     * @return array headers received from server in the form headername => value
     * @seeAlso get, head
     **/
    function getHeaders()
    {
        if( $this->debug & DBGTRACE ) echo "getHeaders()\n";
        if( $this->debug & DBGINDATA ) { 
            echo "DBG.INDATA responseHeaders="; print_r( $this->responseHeaders );
        }
        return $this->responseHeaders;
    }

    /**
     * getHeader
     * return the response header "headername"
     * @param headername the name of the header
     * @return header value or NULL if no such header is defined
     **/
    function getHeader( $headername )
    {
        if( $this->debug & DBGTRACE ) echo "getHeaderName( $headername )\n";
        return $this->responseHeaders[$headername];
    }

    /**
     * getBody
     * return the response body
     * invoke it after a Get() call for instance, to retrieve the response
     * @return string body content
     * @seeAlso get, head
     **/
    function getBody()
    {
        if( $this->debug & DBGTRACE ) echo "getBody()\n";
        return $this->responseBody;
    }

    /** 
      * getStatus return the server response's status code 
      * @return string a status code
      * code are divided in classes (where x is a digit)
      *  - 20x : request processed OK
      *  - 30x : document moved
      *  - 40x : client error ( bad url, document not found, etc...)
      *  - 50x : server error 
      * @see RFC2616 "Hypertext Transfer Protocol -- HTTP/1.1"
      **/
    function getStatus() 
    {
        return $this->reply;
    }
  
    
    /** 
      * getStatusMessage return the full response status, of the form "CODE Message"
      * eg. "404 Document not found"
      * @return string the message 
      **/
    function getStatusMessage() 
    {
        return $this->replyString;
    }




    /*********************************************
     * @scope only protected or private methods below
     **/

    /** 
      * send a request
      * data sent are in order
      * a) the command
      * b) the request headers if they are defined
      * c) the request body if defined
      * @return string the server repsonse status code
      **/
    function sendCommand( $command ) 
    {        
        if( $this->debug & DBGLOW ) echo "sendCommand( $command )\n";
        $this->responseHeaders = array();
        $this->responseBody = "";

        // connect if necessary        
        if( $this->socket == false or feof( $this->socket) ) {
            
            if( $this->useProxy ) {
                $host = $this->proxyHost;
                $port = $this->proxyPort;
            } else {
                $host = $this->url['host'];
                $port = $this->url['port'];
            }
            if( $port == "" )  $port = 80;
            $this->socket = fsockopen( $host, $port, &$this->reply, &$this->replyString , 5);
            if( $this->debug & DBGSOCK ) echo "connexion( $host, $port) => $this->socket\n";
            if( ! $this->socket ) {
                if( $this->debug & DBGSOCK ) echo "FAILED : $this->replyString ($this->reply)\n";
                return false;
            }
            socket_set_timeout ( $this->socket, 5 );
            #set_socket_timeout ( $this->socket, 5 );
            #stream_set_timeout ( $this->socket, 5 );
        }
                
        if( $this->requestBody != ""  ) {
            $this->addHeader( "Content-Length", strlen( $this->requestBody ) );
        }

        $this->request = $command;
        $cmd = $command . CRLF;
        if( is_array( $this->requestHeaders) ) {
            foreach( $this->requestHeaders as $k => $v ) {
                $cmd .= "$k: $v" . CRLF;
            }
        }
        
        if( $this->requestBody != ""  ) {
            $cmd .= CRLF . $this->requestBody;
        }

        // unset body (in case of successive requests)
        $this->requestBody = "";
        if( $this->debug & DBGOUTDATA ) echo "DBG.OUTDATA Sending\n$cmd\n";
        
        fputs( $this->socket, $cmd . CRLF );
        return true;
    }

    function processReply()
    {
        if( $this->debug & DBGLOW ) echo "processReply()\n";

        $this->replyString = trim(fgets( $this->socket,1024) );
        
        if( preg_match( "|^HTTP/\S+ (\d+) |i", $this->replyString, $a )) {
            $this->reply = $a[1];
        } else {
            $this->reply = EBADRESPONSE;
        }
        if( $this->debug & DBGINDATA ) echo "replyLine: $this->replyString\n";

        //    get response headers and body
        $this->responseHeaders = $this->processHeader();
        $this->responseBody = $this->processBody();
//        if( $this->responseHeaders['set-cookie'] )
//            $this->addHeader( "cookie", $this->responseHeaders['set-cookie'] );
        return $this->reply;
    }
    
    /** 
      * processHeader() reads header lines from socket until the line equals $lastLine
      * @scope protected
      * @return array of headers with header names as keys and header content as values
      **/
    function processHeader( $lastLine = CRLF )
    {
        if( $this->debug & DBGLOW ) echo "processHeader( [lastLine] )\n";
        $headers = array();
        $finished = false;
        $header_count = 0;
        
        while ( ( ! $finished ) && ( ! feof($this->socket)) && ($header_count < 20)) {
            $header_count++;
            $str = fgets( $this->socket, 1024 );
            if( $this->debug & DBGINDATA ) echo "HEADER : $str";
            $finished = ( $str == $lastLine );
            if ( !$finished ) {
                list( $hdr, $value ) = split( ": ", $str, 2 );
                // nasty workaround broken multiple same headers (eg. Set-Cookie headers) @FIXME 
                if( isset( $headers[$hdr]) )
                    $headers[$hdr] .= "; " . trim($value);
                else
                    $headers[$hdr] = trim($value);
            }
        }
        return $headers;
    }

    /** 
      * processBody() reads the body from the socket 
      * the body is the "real" content of the reply
      * @return string body content 
      * @scope private
      **/
    function processBody()
    {
        $failureCount = 0;
        if( $this->debug & DBGLOW ) echo "processBody()\n";
/*        if( $this->responseHeaders['Content-Length'] ) 
        {
            $length = $this->responseHeaders['Content-Length'];
            $data = fread( $this->socket, $length );
            if( $this->debug & DBGSOCK ) echo "DBG.SOCK socket_read using Content-Length ($length)\n";

        } else {*/

            $data = "";
            $counter = 0;
//            socket_set_blocking( $this->socket, false );
            do{
                $status = socket_get_status( $this->socket );
                if( $status['eof'] == 1 ) {
                    if( $this->debug & DBGSOCK ) echo "DBG.SOCK status eof met, finished socket_read\n";            
                    break;
                }
                if( $status['unread_bytes'] > 0 ) {
                    $buffer = fread( $this->socket, $status['unread_bytes'] );
                    $counter = 0;
                } else {
                    $buffer = fread( $this->socket, 1024 );
                    $failureCount++;
                    usleep(2);
                }
                $data .= $buffer;
                if( $this->debug & DBGSOCK )
                    echo implode( " | ", $status ), "\n";
                
            } while(  $status['unread_bytes'] > 0 || $counter++ < 10 );

            if( $this->debug & DBGSOCK ) {
                echo "DBG.SOCK Counter:$counter\nRead failure #: $failureCount\n";
                echo "         Socket status: "; print_r($status);
            }
//            socket_set_blocking( $this->socket, true );
//        }
        return $data;
    }


    /**
     * Calculate and return the URI to be sent ( proxy purpose )
     * @param the local URI
     * @return URI to be used in the HTTP request
     * @scope private
     **/
     
    function makeUri( $uri )
    {
        $a = parse_url( $uri );

        if( isset($a['scheme']) && isset($a['host']) ) {
            $this->url = $a;
        } else {
            unset( $this->url['query']);
            unset( $this->url['fragment']);
            $this->url = array_merge( $this->url, $a );
        }        
        if( $this->useProxy ) {
            $requesturi= "http://" . $this->url['host'] . ( empty($this->url['port']) ? "" : ":" . $this->url['port'] ) . $this->url['path'] . ( empty($this->url['query']) ? "" : "?" . $this->url['query'] );
        } else {
            $requesturi = $this->url['path'] . (empty( $this->url['query'] ) ? "" : "?" . $this->url['query']);
        }
        return $requesturi;
    }
    
} // end class Net_HTTP_Client

    
?>