class-ixr.php

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<?php

/* 
   IXR - The Inutio XML-RPC Library - (c) Incutio Ltd 2002
   Version 1.62WP - Simon Willison, 11th July 2003 (htmlentities -> htmlspecialchars)
           ^^^^^^ (We've made some changes)
   Site:   http://scripts.incutio.com/xmlrpc/
   Manual: http://scripts.incutio.com/xmlrpc/manual.php
   Made available under the BSD License: http://www.opensource.org/licenses/bsd-license.php
*/


class IXR_Value {
    var $data;
    var $type;
    function IXR_Value ($data, $type = false) {
        $this->data = $data;
        if (!$type) {
            $type = $this->calculateType();
        }
        $this->type = $type;
        if ($type == 'struct') {
            /* Turn all the values in the array in to new IXR_Value objects */
            foreach ($this->data as $key => $value) {
                $this->data[$key] = new IXR_Value($value);
            }
        }
        if ($type == 'array') {
            for ($i = 0, $j = count($this->data); $i < $j; $i++) {
                $this->data[$i] = new IXR_Value($this->data[$i]);
            }
        }
    }
    function calculateType() {
        if ($this->data === true || $this->data === false) {
            return 'boolean';
        }
        if (is_integer($this->data)) {
            return 'int';
        }
        if (is_double($this->data)) {
            return 'double';
        }
        // Deal with IXR object types base64 and date
        if (is_object($this->data) && is_a($this->data, 'IXR_Date')) {
            return 'date';
        }
        if (is_object($this->data) && is_a($this->data, 'IXR_Base64')) {
            return 'base64';
        }
        // If it is a normal PHP object convert it in to a struct
        if (is_object($this->data)) {
            
            $this->data = get_object_vars($this->data);
            return 'struct';
        }
        if (!is_array($this->data)) {
            return 'string';
        }
        /* We have an array - is it an array or a struct ? */
        if ($this->isStruct($this->data)) {
            return 'struct';
        } else {
            return 'array';
        }
    }
    function getXml() {
        /* Return XML for this value */
        switch ($this->type) {
            case 'boolean':
                return '<boolean>'.(($this->data) ? '1' : '0').'</boolean>';
                break;
            case 'int':
                return '<int>'.$this->data.'</int>';
                break;
            case 'double':
                return '<double>'.$this->data.'</double>';
                break;
            case 'string':
                return '<string>'.htmlspecialchars($this->data).'</string>';
                break;
            case 'array':
                $return = '<array><data>'."\n";
                foreach ($this->data as $item) {
                    $return .= '  <value>'.$item->getXml()."</value>\n";
                }
                $return .= '</data></array>';
                return $return;
                break;
            case 'struct':
                $return = '<struct>'."\n";
                foreach ($this->data as $name => $value) {
                    $return .= "  <member><name>$name</name><value>";
                    $return .= $value->getXml()."</value></member>\n";
                }
                $return .= '</struct>';
                return $return;
                break;
            case 'date':
            case 'base64':
                return $this->data->getXml();
                break;
        }
        return false;
    }
    function isStruct($array) {
        /* Nasty function to check if an array is a struct or not */
        $expected = 0;
        foreach ($array as $key => $value) {
            if ((string)$key != (string)$expected) {
                return true;
            }
            $expected++;
        }
        return false;
    }
}


class IXR_Message {
    var $message;
    var $messageType;  // methodCall / methodResponse / fault
    var $faultCode;
    var $faultString;
    var $methodName;
    var $params;
    // Current variable stacks
    var $_arraystructs = array();   // The stack used to keep track of the current array/struct
    var $_arraystructstypes = array(); // Stack keeping track of if things are structs or array
    var $_currentStructName = array();  // A stack as well
    var $_param;
    var $_value;
    var $_currentTag;
    var $_currentTagContents;
    // The XML parser
    var $_parser;
    function IXR_Message ($message) {
        $this->message = $message;
    }
    function parse() {
        // first remove the XML declaration
        $this->message = preg_replace('/<\?xml(.*)?\?'.'>/', '', $this->message);
        if (trim($this->message) == '') {
            return false;
        }
        $this->_parser = xml_parser_create();
        // Set XML parser to take the case of tags in to account
        xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, false);
        // Set XML parser callback functions
        xml_set_object($this->_parser, $this);
        xml_set_element_handler($this->_parser, 'tag_open', 'tag_close');
        xml_set_character_data_handler($this->_parser, 'cdata');
        if (!xml_parse($this->_parser, $this->message)) {
            /* die(sprintf('XML error: %s at line %d',
                xml_error_string(xml_get_error_code($this->_parser)),
                xml_get_current_line_number($this->_parser))); */
            return false;
        }
        xml_parser_free($this->_parser);
        // Grab the error messages, if any
        if ($this->messageType == 'fault') {
            $this->faultCode = $this->params[0]['faultCode'];
            $this->faultString = $this->params[0]['faultString'];
        }
        return true;
    }
    function tag_open($parser, $tag, $attr) {
        $this->currentTag = $tag;
        switch($tag) {
            case 'methodCall':
            case 'methodResponse':
            case 'fault':
                $this->messageType = $tag;
                break;
            /* Deal with stacks of arrays and structs */
            case 'data':    // data is to all intents and puposes more interesting than array
                $this->_arraystructstypes[] = 'array';
                $this->_arraystructs[] = array();
                break;
            case 'struct':
                $this->_arraystructstypes[] = 'struct';
                $this->_arraystructs[] = array();
                break;
        }
    }
    function cdata($parser, $cdata) {
        $this->_currentTagContents .= $cdata;
    }
    function tag_close($parser, $tag) {
        $valueFlag = false;
        switch($tag) {
            case 'int':
            case 'i4':
                $value = (int)trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            case 'double':
                $value = (double)trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            case 'string':
                $value = (string)trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            case 'dateTime.iso8601':
                $value = new IXR_Date(trim($this->_currentTagContents));
                // $value = $iso->getTimestamp();
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            case 'value':
                // "If no type is indicated, the type is string."
                if (trim($this->_currentTagContents) != '') {
                    $value = (string)$this->_currentTagContents;
                    $this->_currentTagContents = '';
                    $valueFlag = true;
                }
                break;
            case 'boolean':
                $value = (boolean)trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            case 'base64':
                $value = base64_decode( trim($this->_currentTagContents) );
                $this->_currentTagContents = '';
                $valueFlag = true;
                break;
            /* Deal with stacks of arrays and structs */
            case 'data':
            case 'struct':
                $value = array_pop($this->_arraystructs);
                array_pop($this->_arraystructstypes);
                $valueFlag = true;
                break;
            case 'member':
                array_pop($this->_currentStructName);
                break;
            case 'name':
                $this->_currentStructName[] = trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                break;
            case 'methodName':
                $this->methodName = trim($this->_currentTagContents);
                $this->_currentTagContents = '';
                break;
        }
        if ($valueFlag) {
            /*
            if (!is_array($value) && !is_object($value)) {
                $value = trim($value);
            }
            */
            if (count($this->_arraystructs) > 0) {
                // Add value to struct or array
                if ($this->_arraystructstypes[count($this->_arraystructstypes)-1] == 'struct') {
                    // Add to struct
                    $this->_arraystructs[count($this->_arraystructs)-1][$this->_currentStructName[count($this->_currentStructName)-1]] = $value;
                } else {
                    // Add to array
                    $this->_arraystructs[count($this->_arraystructs)-1][] = $value;
                }
            } else {
                // Just add as a paramater
                $this->params[] = $value;
            }
        }
    }       
}


class IXR_Server {
    var $data;
    var $callbacks = array();
    var $message;
    var $capabilities;
    function IXR_Server($callbacks = false, $data = false) {
        $this->setCapabilities();
        if ($callbacks) {
            $this->callbacks = $callbacks;
        }
        $this->setCallbacks();
        $this->serve($data);
    }
    function serve($data = false) {
        if (!$data) {
            global $HTTP_RAW_POST_DATA;
            if (!$HTTP_RAW_POST_DATA) {
               die('XML-RPC server accepts POST requests only.');
            }
            $data = $HTTP_RAW_POST_DATA;
        }
        $this->message = new IXR_Message($data);
        if (!$this->message->parse()) {
            $this->error(-32700, 'parse error. not well formed');
        }
        if ($this->message->messageType != 'methodCall') {
            $this->error(-32600, 'server error. invalid xml-rpc. not conforming to spec. Request must be a methodCall');
        }
        $result = $this->call($this->message->methodName, $this->message->params);
        // Is the result an error?
        if (is_a($result, 'IXR_Error')) {
            $this->error($result);
        }
        // Encode the result
        $r = new IXR_Value($result);
        $resultxml = $r->getXml();
        // Create the XML
        $xml = <<<EOD
<methodResponse>
  <params>
    <param>
      <value>
        $resultxml
      </value>
    </param>
  </params>
</methodResponse>

EOD;
        // Send it
        $this->output($xml);
    }
    function call($methodname, $args) {
        if (!$this->hasMethod($methodname)) {
            return new IXR_Error(-32601, 'server error. requested method '.$methodname.' does not exist.');
        }
        $method = $this->callbacks[$methodname];
        // Perform the callback and send the response
        if (count($args) == 1) {
            // If only one paramater just send that instead of the whole array
            $args = $args[0];
        }
        // Are we dealing with a function or a method?
        if (substr($method, 0, 5) == 'this:') {
            // It's a class method - check it exists
            $method = substr($method, 5);
            if (!method_exists($this, $method)) {
                return new IXR_Error(-32601, 'server error. requested class method "'.$method.'" does not exist.');
            }
            // Call the method
            $result = $this->$method($args);
        } else {
            // It's a function - does it exist?
            if (is_array($method)) {
            	if (!method_exists($method[0], $method[1])) {
                return new IXR_Error(-32601, 'server error. requested object method "'.$method[1].'" does not exist.');
            	}
            } else if (!function_exists($method)) {
                return new IXR_Error(-32601, 'server error. requested function "'.$method.'" 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 && !is_object($error)) {
            $error = new IXR_Error($error, $message);
        }
        $this->output($error->getXml());
    }
    function output($xml) {
        $xml = '<?xml version="1.0"?>'."\n".$xml;
        $length = strlen($xml);
        header('Connection: close');
        header('Content-Length: '.$length);
        header('Content-Type: text/xml');
        header('Date: '.date('r'));
        echo $xml;
        exit;
    }
    function hasMethod($method) {
        return in_array($method, array_keys($this->callbacks));
    }
    function setCapabilities() {
        // Initialises capabilities array
        $this->capabilities = array(
            'xmlrpc' => array(
                'specUrl' => 'http://www.xmlrpc.com/spec',
                'specVersion' => 1
            ),
            'faults_interop' => array(
                'specUrl' => 'http://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php',
                'specVersion' => 20010516
            ),
            'system.multicall' => array(
                'specUrl' => 'http://www.xmlrpc.com/discuss/msgReader$1208',
                'specVersion' => 1
            ),
        );   
    }
    function getCapabilities($args) {
        return $this->capabilities;
    }
    function setCallbacks() {
        $this->callbacks['system.getCapabilities'] = 'this:getCapabilities';
        $this->callbacks['system.listMethods'] = 'this:listMethods';
        $this->callbacks['system.multicall'] = 'this:multiCall';
    }
    function listMethods($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($this->callbacks));
    }
    function multiCall($methodcalls) {
        // See http://www.xmlrpc.com/discuss/msgReader$1208
        $return = array();
        foreach ($methodcalls as $call) {