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/**
 * IXR_Server
 *
 * @package IXR
 * @since 1.5.0
 */
class IXR_Server
{
    var $data;
    var $callbacks = array();
    var $message;
    var $capabilities;

	/**
	 * PHP5 constructor.
	 */
    function __construct( $callbacks = false, $data = false, $wait = false )
    {
        $this-&gt;setCapabilities();
        if ($callbacks) {
            $this-&gt;callbacks = $callbacks;
        }
        $this-&gt;setCallbacks();
        if (!$wait) {
            $this-&gt;serve($data);
        }
    }

	/**
	 * PHP4 constructor.
	 */
	public function IXR_Server( $callbacks = false, $data = false, $wait = false ) {
		self::__construct( $callbacks, $data, $wait );
	}

    function serve($data = false)
    {
        if (!$data) {
            if (isset($_SERVER['REQUEST_METHOD']) &amp;&amp; $_SERVER['REQUEST_METHOD'] !== 'POST') {
                if ( function_exists( 'status_header' ) ) {
                    status_header( 405 ); // WP #20986
                    header( 'Allow: POST' );
                }
                header('Content-Type: text/plain'); // merged from WP #9093
                die('XML-RPC server accepts POST requests only.');
            }

            $data = file_get_contents('php://input');
        }
        $this-&gt;message = new IXR_Message($data);
        if (!$this-&gt;message-&gt;parse()) {
            $this-&gt;error(-32700, 'parse error. not well formed');
        }
        if ($this-&gt;message-&gt;messageType != 'methodCall') {
            $this-&gt;error(-32600, 'server error. invalid xml-rpc. not conforming to spec. Request must be a methodCall');
        }
        $result = $this-&gt;call($this-&gt;message-&gt;methodName, $this-&gt;message-&gt;params);

        // Is the result an error?
        if (is_a($result, 'IXR_Error')) {
            $this-&gt;error($result);
        }

        // Encode the result
        $r = new IXR_Value($result);
        $resultxml = $r-&gt;getXml();

        // Create the XML
        $xml = &lt;&lt;&lt;EOD
&lt;methodResponse&gt;
  &lt;params&gt;
    &lt;param&gt;
      &lt;value&gt;
      $resultxml
      &lt;/value&gt;
    &lt;/param&gt;
  &lt;/params&gt;
&lt;/methodResponse&gt;

EOD;
      // Send it
      $this-&gt;output($xml);
    }

    function call($methodname, $args)
    {
        if (!$this-&gt;hasMethod($methodname)) {
            return new IXR_Error(-32601, 'server error. requested method '.$methodname.' does not exist.');
        }
        $method = $this-&gt;callbacks[$methodname];

        // Perform the callback and send the response
        if (count($args) == 1) {
            // If only one parameter just send that instead of the whole array
            $args = $args[0];
        }

        // Are we dealing with a function or a method?
        if (is_string($method) &amp;&amp; substr($method, 0, 5) == 'this:') {
            // It's a class method - check it exists
            $method = substr($method, 5);
            if (!method_exists($this, $method)) {
                return new IXR_Error(-32601, 'server error. requested class method &quot;'.$method.'&quot; does not exist.');
            }

            //Call the method
            $result = $this-&gt;$method($args);
        } else {
            // It's a function - does it exist?
            if (is_array($method)) {
                if (!is_callable(array($method[0], $method[1]))) {
                    return new IXR_Error(-32601, 'server error. requested object method &quot;'.$method[1].'&quot; does not exist.');
                }
            } else if (!function_exists($method)) {
                return new IXR_Error(-32601, 'server error. requested function &quot;'.$method.'&quot; does not exist.');
            }

            // Call the function
            $result = call_user_func($method, $args);
        }
        return $result;
    }

    function error($error, $message = false)
    {
        // Accepts either an error object or an error code and message
        if ($message &amp;&amp; !is_object($error)) {
            $error = new IXR_Error($error, $message);
        }

        $this-&gt;output($error-&gt;getXml());
    }

    function output($xml)
    {
        $charset = function_exists('get_option') ? get_option('blog_charset') : '';
        if ($charset)
            $xml = '&lt;?xml version=&quot;1.0&quot; encoding=&quot;'.$charset.'&quot;?&gt;'.&quot;\n&quot;.$xml;
        else
            $xml = '&lt;?xml version=&quot;1.0&quot;?&gt;'.&quot;\n&quot;.$xml;
        $length = strlen($xml);
        header('Connection: close');
        if ($charset)
            header('Content-Type: text/xml; charset='.$charset);
        else
            header('Content-Type: text/xml');
        header('Date: '.gmdate('r'));
        echo $xml;
        exit;
    }

    function hasMethod($method)
    {
        return in_array($method, array_keys($this-&gt;callbacks));
    }

    function setCapabilities()
    {
        // Initialises capabilities array
        $this-&gt;capabilities = array(
            'xmlrpc' =&gt; array(
                'specUrl' =&gt; 'http://www.xmlrpc.com/spec',
                'specVersion' =&gt; 1
        ),
            'faults_interop' =&gt; array(
                'specUrl' =&gt; 'http://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php',
                'specVersion' =&gt; 20010516
        ),
            'system.multicall' =&gt; array(
                'specUrl' =&gt; 'http://www.xmlrpc.com/discuss/msgReader$1208',
                'specVersion' =&gt; 1
        ),
        );
    }

    function getCapabilities($args)
    {
        return $this-&gt;capabilities;
    }

    function setCallbacks()
    {
        $this-&gt;callbacks['system.getCapabilities'] = 'this:getCapabilities';
        $this-&gt;callbacks['system.listMethods'] = 'this:listMethods';
        $this-&gt;callbacks['system.multicall'] = 'this:multiCall';
    }

    function listMethods($args)
    {
        // Returns a list of methods - uses array_reverse to ensure user defined
        // methods are listed before server defined methods
        return array_reverse(array_keys($this-&gt;callbacks));
    }

    function multiCall($methodcalls)
    {
        // See http://www.xmlrpc.com/discuss/msgReader$1208
        $return = array();
        foreach ($methodcalls as $call) {
            $method = $call['methodName'];
            $params = $call['params'];
            if ($method == 'system.multicall') {
                $result = new IXR_Error(-32600, 'Recursive calls to system.multicall are forbidden');
            } else {
                $result = $this-&gt;call($method, $params);
            }
            if (is_a($result, 'IXR_Error')) {
                $return[] = array(
                    'faultCode' =&gt; $result-&gt;code,
                    'faultString' =&gt; $result-&gt;message
                );
            } else {
                $return[] = array($result);
            }
        }
        return $return;
    }
}
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