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<?php
/**
 * This file contains the code for the SOAP message parser.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 2.02 of the PHP license,
 * that is bundled with this package in the file LICENSE, and is available at
 * through the world-wide-web at http://www.php.net/license/2_02.txt.  If you
 * did not receive a copy of the PHP license and are unable to obtain it
 * through the world-wide-web, please send a note to license@php.net so we can
 * mail you a copy immediately.
 *
 * @category   Web Services
 * @package    SOAP
 * @author     Dietrich Ayala <dietrich@ganx4.com> Original Author
 * @author     Shane Caraveo <Shane@Caraveo.com>   Port to PEAR and more
 * @author     Chuck Hagenbuch <chuck@horde.org>   Maintenance
 * @author     Jan Schneider <jan@horde.org>       Maintenance
 * @copyright  2003-2005 The PHP Group
 * @license    http://www.php.net/license/2_02.txt  PHP License 2.02
 * @link       http://pear.php.net/package/SOAP
 */

require_once 'SOAP/Base.php';
require_once 'SOAP/Value.php';

/**
 * SOAP Parser
 *
 * This class is used by SOAP::Message and SOAP::Server to parse soap
 * packets. Originally based on SOAPx4 by Dietrich Ayala
 * http://dietrich.ganx4.com/soapx4
 *
 * @access public
 * @package SOAP
 * @author Shane Caraveo <shane@php.net> Conversion to PEAR and updates
 * @author Dietrich Ayala <dietrich@ganx4.com> Original Author
 */
class SOAP_Parser extends SOAP_Base
{
    var $status = '';
    var $position = 0;
    var $depth = 0;
    var $default_namespace = '';
    var $message = array();
    var $depth_array = array();
    var $parent = 0;
    var $root_struct_name = array();
    var $header_struct_name = array();
    var $curent_root_struct_name = '';
    var $root_struct = array();
    var $header_struct = array();
    var $curent_root_struct = 0;
    var $references = array();
    var $need_references = array();

    /**
     * Used to handle non-root elements before root body element.
     *
     * @var integer
     */
    var $bodyDepth;

    /**
     * Constructor.
     *
     * @param string $xml         XML content.
     * @param string $encoding    Character set encoding, defaults to 'UTF-8'.
     * @param array $attachments  List of attachments.
     */
    function SOAP_Parser($xml, $encoding = SOAP_DEFAULT_ENCODING,
                         $attachments = null)
    {
        parent::SOAP_Base('Parser');
        $this->_setSchemaVersion(SOAP_XML_SCHEMA_VERSION);

        $this->attachments = $attachments;

        // Check the XML tag for encoding.
        if (preg_match('/<\?xml[^>]+encoding\s*?=\s*?(\'([^\']*)\'|"([^"]*)")[^>]*?[\?]>/', $xml, $m)) {
            $encoding = strtoupper($m[2] ? $m[2] : $m[3]);
        }

        // Determine where in the message we are (envelope, header, body,
        // method). Check whether content has been read.
        if (!empty($xml)) {
            // Prepare the XML parser.
            $parser = xml_parser_create($encoding);
            xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
            xml_set_object($parser, $this);
            xml_set_element_handler($parser, '_startElement', '_endElement');
            xml_set_character_data_handler($parser, '_characterData');

            // Some lame SOAP implementations add nul bytes at the end of the
            // SOAP stream, and expat chokes on that.
            if ($xml[strlen($xml) - 1] == 0) {
                $xml = trim($xml);
            }

            // Parse the XML file.
            if (!xml_parse($parser, $xml, true)) {
                $err = sprintf('XML error on line %d col %d byte %d %s',
                               xml_get_current_line_number($parser),
                               xml_get_current_column_number($parser),
                               xml_get_current_byte_index($parser),
                               xml_error_string(xml_get_error_code($parser)));
                $this->_raiseSoapFault($err, htmlspecialchars($xml));
            }
            xml_parser_free($parser);
        }
    }

    /**
     * Returns an array of responses.
     *
     * After parsing a SOAP message, use this to get the response.
     *
     * @return array
     */
    function getResponse()
    {
        if (!empty($this->root_struct[0])) {
            return $this->_buildResponse($this->root_struct[0]);
        } else {
            return $this->_raiseSoapFault('Cannot build response');
        }
    }

    /**
     * Returns an array of header responses.
     *
     * After parsing a SOAP message, use this to get the response.
     *
     * @return array
     */
    function getHeaders()
    {
        if (!empty($this->header_struct[0])) {
            return $this->_buildResponse($this->header_struct[0]);
        } else {
            // We don't fault if there are no headers; that can be handled by
            // the application if necessary.
            return null;
        }
    }

    /**
     * Recurses to build a multi dimensional array.
     *
     * @see _buildResponse()
     */
    function _domulti($d, &$ar, &$r, &$v, $ad = 0)
    {
        if ($d) {
            $this->_domulti($d - 1, $ar, $r[$ar[$ad]], $v, $ad + 1);
        } else {
            $r = $v;
        }
    }

    /**
     * Loops through the message, building response structures.
     *
     * @param integer $pos  Position.
     *
     * @return SOAP_Value
     */
    function _buildResponse($pos)
    {
        $response = null;

        if (isset($this->message[$pos]['children'])) {
            $children = explode('|', $this->message[$pos]['children']);
            foreach ($children as $c => $child_pos) {
                if ($this->message[$child_pos]['type'] != null) {
                    $response[] = $this->_buildResponse($child_pos);
                }
            }
            if (isset($this->message[$pos]['arraySize'])) {
                $ardepth = count($this->message[$pos]['arraySize']);
                if ($ardepth > 1) {
                    $ar = array_pad(array(), $ardepth, 0);
                    if (isset($this->message[$pos]['arrayOffset'])) {
                        for ($i = 0; $i < $ardepth; $i++) {
                            $ar[$i] += $this->message[$pos]['arrayOffset'][$i];
                        }
                    }
                    $elc = count($response);
                    for ($i = 0; $i < $elc; $i++) {
                        // Recurse to build a multi dimensional array.
                        $this->_domulti($ardepth, $ar, $newresp, $response[$i]);

                        // Increment our array pointers.
                        $ad = $ardepth - 1;
                        $ar[$ad]++;
                        while ($ad > 0 &&
                               $ar[$ad] >= $this->message[$pos]['arraySize'][$ad]) {
                            $ar[$ad] = 0;
                            $ad--;
                            $ar[$ad]++;
                        }
                    }
                    $response = $newresp;
                } elseif (isset($this->message[$pos]['arrayOffset']) &&
                          $this->message[$pos]['arrayOffset'][0] > 0) {
                    // Check for padding.
                    $pad = $this->message[$pos]['arrayOffset'][0] + count($response) * -1;
                    $response = array_pad($response, $pad, null);
                }
            }
        }

        // Build attributes.
        $attrs = array();
        foreach ($this->message[$pos]['attrs'] as $atn => $atv) {
            if (!strstr($atn, 'xmlns') && !strpos($atn, ':')) {
                $attrs[$atn] = $atv;
            }
        }

        // Add current node's value.
        $nqn = new QName($this->message[$pos]['name'],
                         $this->message[$pos]['namespace']);
        $tqn = new QName($this->message[$pos]['type'],
                         $this->message[$pos]['type_namespace']);
        if ($response) {
            $response = new SOAP_Value($nqn->fqn(), $tqn->fqn(), $response,
                                       $attrs);
            if (isset($this->message[$pos]['arrayType'])) {
                $response->arrayType = $this->message[$pos]['arrayType'];
            }
        } else {
            // Check if value is an empty array
            if ($tqn->name == 'Array') {
                $response = new SOAP_Value($nqn->fqn(), $tqn->fqn(), array(),
                                           $attrs);
                //if ($pos == 4) var_dump($this->message[$pos], $response);
            } else {
                $response = new SOAP_Value($nqn->fqn(), $tqn->fqn(),
                                           $this->message[$pos]['cdata'],
                                           $attrs);
            }
        }

        // Handle header attribute that we need.
        if (array_key_exists('actor', $this->message[$pos])) {
            $response->actor = $this->message[$pos]['actor'];
        }
        if (array_key_exists('mustUnderstand', $this->message[$pos])) {
            $response->mustunderstand = $this->message[$pos]['mustUnderstand'];
        }

        return $response;
    }

    /**
     * Start element handler used with the XML parser.
     */
    function _startElement($parser, $name, $attrs)
    {
        // Position in a total number of elements, starting from 0.
        // Update class level position.
        $pos = $this->position++;

        // And set mine.
        $this->message[$pos] = array(
            'type' => '',
            'type_namespace' => '',
            'cdata' => '',
            'pos' => $pos,
            'id' => '');

        // Parent/child/depth determinations.

        // depth = How many levels removed from root?
        // Set mine as current global depth and increment global depth value.
        $this->message[$pos]['depth'] = $this->depth++;

        // Else add self as child to whoever the current parent is.
        if ($pos != 0) {
            if (isset($this->message[$this->parent]['children'])) {
                $this->message[$this->parent]['children'] .= '|' . $pos;
            } else {
                $this->message[$this->parent]['children'] = $pos;
            }
        }

        // Set my parent.
        $this->message[$pos]['parent'] = $this->parent;

        // Set self as current value for this depth.
        $this->depth_array[$this->depth] = $pos;
        // Set self as current parent.
        $this->parent = $pos;
        $qname = new QName($name);
        // Set status.
        if (strcasecmp('envelope', $qname->name) == 0) {
            $this->status = 'envelope';
        } elseif (strcasecmp('header', $qname->name) == 0) {
            $this->status = 'header';
            $this->header_struct_name[] = $this->curent_root_struct_name = $qname->name;
            $this->header_struct[] = $this->curent_root_struct = $pos;
            $this->message[$pos]['type'] = 'Struct';
        } elseif (strcasecmp('body', $qname->name) == 0) {
            $this->status = 'body';
            $this->bodyDepth = $this->depth;

        // Set method
        } elseif ($this->status == 'body') {
            // Is this element allowed to be a root?
            // TODO: this needs to be optimized, we loop through $attrs twice
            // now.
            $can_root = $this->depth == $this->bodyDepth + 1;
            if ($can_root) {
                foreach ($attrs as $key => $value) {
                    if (stristr($key, ':root') && !$value) {
                        $can_root = false;
                    }
                }
            }

            if ($can_root) {
                $this->status = 'method';
                $this->root_struct_name[] = $this->curent_root_struct_name = $qname->name;
                $this->root_struct[] = $this->curent_root_struct = $pos;
                $this->message[$pos]['type'] = 'Struct';
            }
        }

        // Set my status.
        $this->message[$pos]['status'] = $this->status;

        // Set name.
        $this->message[$pos]['name'] = htmlspecialchars($qname->name);

        // Set attributes.
        $this->message[$pos]['attrs'] = $attrs;

        // Loop through attributes, logging ns and type declarations.
        foreach ($attrs as $key => $value) {
            // If ns declarations, add to class level array of valid
            // namespaces.
            $kqn = new QName($key);
            if ($kqn->ns == 'xmlns') {
                $prefix = $kqn->name;

                if (in_array($value, $this->_XMLSchema)) {
                    $this->_setSchemaVersion($value);
                }

                $this->_namespaces[$value] = $prefix;

            // Set method namespace.
            } elseif ($key == 'xmlns') {
                $qname->ns = $this->_getNamespacePrefix($value);
                $qname->namespace = $value;
            } elseif ($kqn->name == 'actor') {
                $this->message[$pos]['actor'] = $value;
            } elseif ($kqn->name == 'mustUnderstand') {
                $this->message[$pos]['mustUnderstand'] = $value;

            // If it's a type declaration, set type.
            } elseif ($kqn->name == 'type') {
                $vqn = new QName($value);
                $this->message[$pos]['type'] = $vqn->name;
                $this->message[$pos]['type_namespace'] = $this->_getNamespaceForPrefix($vqn->ns);

                // Should do something here with the namespace of specified
                // type?

            } elseif ($kqn->name == 'arrayType') {
                $vqn = new QName($value);
                $this->message[$pos]['type'] = 'Array';
                if (isset($vqn->arraySize)) {
                    $this->message[$pos]['arraySize'] = $vqn->arraySize;
                }
                $this->message[$pos]['arrayType'] = $vqn->name;

            } elseif ($kqn->name == 'offset') {
                $this->message[$pos]['arrayOffset'] = split(',', substr($value, 1, strlen($value) - 2));

            } elseif ($kqn->name == 'id') {
                // Save id to reference array.
                $this->references[$value] = $pos;
                $this->message[$pos]['id'] = $value;

            } elseif ($kqn->name == 'href') {
                if ($value[0] == '#') {
                    $ref = substr($value, 1);
                    if (isset($this->references[$ref])) {
                        // cdata, type, inval.
                        $ref_pos = $this->references[$ref];
                        $this->message[$pos]['children'] = &$this->message[$ref_pos]['children'];
                        $this->message[$pos]['cdata'] = &$this->message[$ref_pos]['cdata'];
                        $this->message[$pos]['type'] = &$this->message[$ref_pos]['type'];
                        $this->message[$pos]['arraySize'] = &$this->message[$ref_pos]['arraySize'];
                        $this->message[$pos]['arrayType'] = &$this->message[$ref_pos]['arrayType'];
                    } else {
                        // Reverse reference, store in 'need reference'.
                        if (!isset($this->need_references[$ref])) {
                            $this->need_references[$ref] = array();
                        }
                        $this->need_references[$ref][] = $pos;
                    }
                } elseif (isset($this->attachments[$value])) {
                    $this->message[$pos]['cdata'] = $this->attachments[$value];
                }
            }
        }
        // See if namespace is defined in tag.
        if (isset($attrs['xmlns:' . $qname->ns])) {
            $namespace = $attrs['xmlns:' . $qname->ns];
        } elseif ($qname->ns && !$qname->namespace) {
            $namespace = $this->_getNamespaceForPrefix($qname->ns);
        } else {
            // Get namespace.
            $namespace = $qname->namespace ? $qname->namespace : $this->default_namespace;
        }
        $this->message[$pos]['namespace'] = $namespace;
        $this->default_namespace = $namespace;
    }

    /**
     * End element handler used with the XML parser.
     */
    function _endElement($parser, $name)
    {
        // Position of current element is equal to the last value left in
        // depth_array for my depth.
        $pos = $this->depth_array[$this->depth];

        // Bring depth down a notch.
        $this->depth--;
        $qname = new QName($name);

        // Get type if not explicitly declared in an xsi:type attribute.
        // TODO: check on integrating WSDL validation here.
        if ($this->message[$pos]['type'] == '') {
            if (isset($this->message[$pos]['children'])) {
                /* this is slow, need to look at some faster method
                $children = explode('|', $this->message[$pos]['children']);
                if (count($children) > 2 &&
                    $this->message[$children[1]]['name'] == $this->message[$children[2]]['name']) {
                    $this->message[$pos]['type'] = 'Array';
                } else {
                    $this->message[$pos]['type'] = 'Struct';
                }*/
                $this->message[$pos]['type'] = 'Struct';
            } else {
                $parent = $this->message[$pos]['parent'];
                if ($this->message[$parent]['type'] == 'Array' &&
                    isset($this->message[$parent]['arrayType'])) {
                    $this->message[$pos]['type'] = $this->message[$parent]['arrayType'];
                } else {
                    $this->message[$pos]['type'] = 'string';
                }
            }
        }

        // If tag we are currently closing is the method wrapper.
        if ($pos == $this->curent_root_struct) {
            $this->status = 'body';
        } elseif ($qname->name == 'Body' || $qname->name == 'Header') {
            $this->status = 'envelope';
        }

        // Set parent back to my parent.
        $this->parent = $this->message[$pos]['parent'];

        // Handle any reverse references now.
        $idref = $this->message[$pos]['id'];

        if ($idref != '' && isset($this->need_references[$idref])) {
            foreach ($this->need_references[$idref] as $ref_pos) {
                // XXX is this stuff there already?
                $this->message[$ref_pos]['children'] = &$this->message[$pos]['children'];
                $this->message[$ref_pos]['cdata'] = &$this->message[$pos]['cdata'];
                $this->message[$ref_pos]['type'] = &$this->message[$pos]['type'];
                $this->message[$ref_pos]['arraySize'] = &$this->message[$pos]['arraySize'];
                $this->message[$ref_pos]['arrayType'] = &$this->message[$pos]['arrayType'];
            }
        }
    }

    /**
     * Element content handler used with the XML parser.
     */
    function _characterData($parser, $data)
    {
        $pos = $this->depth_array[$this->depth];
        if (isset($this->message[$pos]['cdata'])) {
            $this->message[$pos]['cdata'] .= $data;
        } else {
            $this->message[$pos]['cdata'] = $data;
        }
    }

}
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