--- /dev/null
+<?php
+
+namespace PhpXmlRpc\Helper;
+
+use PhpXmlRpc\PhpXmlRpc;
+use PhpXmlRpc\Value;
+
+/**
+ * Deals with parsing the XML.
+ */
+class XMLParser
+{
+ // used to store state during parsing
+ // quick explanation of components:
+ // ac - used to accumulate values
+ // stack - array with genealogy of xml elements names:
+ // used to validate nesting of xmlrpc elements
+ // valuestack - array used for parsing arrays and structs
+ // lv - used to indicate "looking for a value": implements
+ // the logic to allow values with no types to be strings
+ // isf - used to indicate a parsing fault (2) or xmlrpc response fault (1)
+ // isf_reason - used for storing xmlrpc response fault string
+ // method - used to store method name
+ // params - used to store parameters in method calls
+ // pt - used to store the type of each received parameter. Useful if parameters are automatically decoded to php values
+ // rt - 'methodcall or 'methodresponse'
+ public $_xh = array(
+ 'ac' => '',
+ 'stack' => array(),
+ 'valuestack' => array(),
+ 'isf' => 0,
+ 'isf_reason' => '',
+ 'method' => false, // so we can check later if we got a methodname or not
+ 'params' => array(),
+ 'pt' => array(),
+ 'rt' => '',
+ );
+
+ public $xmlrpc_valid_parents = array(
+ 'VALUE' => array('MEMBER', 'DATA', 'PARAM', 'FAULT'),
+ 'BOOLEAN' => array('VALUE'),
+ 'I4' => array('VALUE'),
+ 'I8' => array('VALUE'),
+ 'EX:I8' => array('VALUE'),
+ 'INT' => array('VALUE'),
+ 'STRING' => array('VALUE'),
+ 'DOUBLE' => array('VALUE'),
+ 'DATETIME.ISO8601' => array('VALUE'),
+ 'BASE64' => array('VALUE'),
+ 'MEMBER' => array('STRUCT'),
+ 'NAME' => array('MEMBER'),
+ 'DATA' => array('ARRAY'),
+ 'ARRAY' => array('VALUE'),
+ 'STRUCT' => array('VALUE'),
+ 'PARAM' => array('PARAMS'),
+ 'METHODNAME' => array('METHODCALL'),
+ 'PARAMS' => array('METHODCALL', 'METHODRESPONSE'),
+ 'FAULT' => array('METHODRESPONSE'),
+ 'NIL' => array('VALUE'), // only used when extension activated
+ 'EX:NIL' => array('VALUE'), // only used when extension activated
+ );
+
+ /**
+ * xml parser handler function for opening element tags.
+ */
+ public function xmlrpc_se($parser, $name, $attrs, $acceptSingleVals = false)
+ {
+ // if invalid xmlrpc already detected, skip all processing
+ if ($this->_xh['isf'] < 2) {
+ // check for correct element nesting
+ // top level element can only be of 2 types
+ /// @todo optimization creep: save this check into a bool variable, instead of using count() every time:
+ /// there is only a single top level element in xml anyway
+ if (count($this->_xh['stack']) == 0) {
+ if ($name != 'METHODRESPONSE' && $name != 'METHODCALL' && (
+ $name != 'VALUE' && !$acceptSingleVals)
+ ) {
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = 'missing top level xmlrpc element';
+
+ return;
+ } else {
+ $this->_xh['rt'] = strtolower($name);
+ }
+ } else {
+ // not top level element: see if parent is OK
+ $parent = end($this->_xh['stack']);
+ if (!array_key_exists($name, $this->xmlrpc_valid_parents) || !in_array($parent, $this->xmlrpc_valid_parents[$name])) {
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "xmlrpc element $name cannot be child of $parent";
+
+ return;
+ }
+ }
+
+ switch ($name) {
+ // optimize for speed switch cases: most common cases first
+ case 'VALUE':
+ /// @todo we could check for 2 VALUE elements inside a MEMBER or PARAM element
+ $this->_xh['vt'] = 'value'; // indicator: no value found yet
+ $this->_xh['ac'] = '';
+ $this->_xh['lv'] = 1;
+ $this->_xh['php_class'] = null;
+ break;
+ case 'I8':
+ case 'EX:I8':
+ if (PHP_INT_SIZE === 4) {
+ /// INVALID ELEMENT: RAISE ISF so that it is later recognized!!!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "Received i8 element but php is compiled in 32 bit mode";
+
+ return;
+ }
+ // fall through voluntarily
+ case 'I4':
+ case 'INT':
+ case 'STRING':
+ case 'BOOLEAN':
+ case 'DOUBLE':
+ case 'DATETIME.ISO8601':
+ case 'BASE64':
+ if ($this->_xh['vt'] != 'value') {
+ // two data elements inside a value: an error occurred!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "$name element following a {$this->_xh['vt']} element inside a single value";
+
+ return;
+ }
+ $this->_xh['ac'] = ''; // reset the accumulator
+ break;
+ case 'STRUCT':
+ case 'ARRAY':
+ if ($this->_xh['vt'] != 'value') {
+ //two data elements inside a value: an error occurred!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "$name element following a {$this->_xh['vt']} element inside a single value";
+
+ return;
+ }
+ // create an empty array to hold child values, and push it onto appropriate stack
+ $curVal = array();
+ $curVal['values'] = array();
+ $curVal['type'] = $name;
+ // check for out-of-band information to rebuild php objs
+ // and in case it is found, save it
+ if (@isset($attrs['PHP_CLASS'])) {
+ $curVal['php_class'] = $attrs['PHP_CLASS'];
+ }
+ $this->_xh['valuestack'][] = $curVal;
+ $this->_xh['vt'] = 'data'; // be prepared for a data element next
+ break;
+ case 'DATA':
+ if ($this->_xh['vt'] != 'data') {
+ //two data elements inside a value: an error occurred!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "found two data elements inside an array element";
+
+ return;
+ }
+ case 'METHODCALL':
+ case 'METHODRESPONSE':
+ case 'PARAMS':
+ // valid elements that add little to processing
+ break;
+ case 'METHODNAME':
+ case 'NAME':
+ /// @todo we could check for 2 NAME elements inside a MEMBER element
+ $this->_xh['ac'] = '';
+ break;
+ case 'FAULT':
+ $this->_xh['isf'] = 1;
+ break;
+ case 'MEMBER':
+ $this->_xh['valuestack'][count($this->_xh['valuestack']) - 1]['name'] = ''; // set member name to null, in case we do not find in the xml later on
+ //$this->_xh['ac']='';
+ // Drop trough intentionally
+ case 'PARAM':
+ // clear value type, so we can check later if no value has been passed for this param/member
+ $this->_xh['vt'] = null;
+ break;
+ case 'NIL':
+ case 'EX:NIL':
+ if (PhpXmlRpc::$xmlrpc_null_extension) {
+ if ($this->_xh['vt'] != 'value') {
+ //two data elements inside a value: an error occurred!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "$name element following a {$this->_xh['vt']} element inside a single value";
+
+ return;
+ }
+ $this->_xh['ac'] = ''; // reset the accumulator
+ break;
+ }
+ // we do not support the <NIL/> extension, so
+ // drop through intentionally
+ default:
+ /// INVALID ELEMENT: RAISE ISF so that it is later recognized!!!
+ $this->_xh['isf'] = 2;
+ $this->_xh['isf_reason'] = "found not-xmlrpc xml element $name";
+ break;
+ }
+
+ // Save current element name to stack, to validate nesting
+ $this->_xh['stack'][] = $name;
+
+ /// @todo optimization creep: move this inside the big switch() above
+ if ($name != 'VALUE') {
+ $this->_xh['lv'] = 0;
+ }
+ }
+ }
+
+ /**
+ * Used in decoding xml chunks that might represent single xmlrpc values.
+ */
+ public function xmlrpc_se_any($parser, $name, $attrs)
+ {
+ $this->xmlrpc_se($parser, $name, $attrs, true);
+ }
+
+ /**
+ * xml parser handler function for close element tags.
+ */
+ public function xmlrpc_ee($parser, $name, $rebuildXmlrpcvals = true)
+ {
+ if ($this->_xh['isf'] < 2) {
+ // push this element name from stack
+ // NB: if XML validates, correct opening/closing is guaranteed and
+ // we do not have to check for $name == $currElem.
+ // we also checked for proper nesting at start of elements...
+ $currElem = array_pop($this->_xh['stack']);
+
+ switch ($name) {
+ case 'VALUE':
+ // This if() detects if no scalar was inside <VALUE></VALUE>
+ if ($this->_xh['vt'] == 'value') {
+ $this->_xh['value'] = $this->_xh['ac'];
+ $this->_xh['vt'] = Value::$xmlrpcString;
+ }
+
+ if ($rebuildXmlrpcvals) {
+ // build the xmlrpc val out of the data received, and substitute it
+ $temp = new Value($this->_xh['value'], $this->_xh['vt']);
+ // in case we got info about underlying php class, save it
+ // in the object we're rebuilding
+ if (isset($this->_xh['php_class'])) {
+ $temp->_php_class = $this->_xh['php_class'];
+ }
+ // check if we are inside an array or struct:
+ // if value just built is inside an array, let's move it into array on the stack
+ $vscount = count($this->_xh['valuestack']);
+ if ($vscount && $this->_xh['valuestack'][$vscount - 1]['type'] == 'ARRAY') {
+ $this->_xh['valuestack'][$vscount - 1]['values'][] = $temp;
+ } else {
+ $this->_xh['value'] = $temp;
+ }
+ } else {
+ /// @todo this needs to treat correctly php-serialized objects,
+ /// since std deserializing is done by php_xmlrpc_decode,
+ /// which we will not be calling...
+ if (isset($this->_xh['php_class'])) {
+ }
+
+ // check if we are inside an array or struct:
+ // if value just built is inside an array, let's move it into array on the stack
+ $vscount = count($this->_xh['valuestack']);
+ if ($vscount && $this->_xh['valuestack'][$vscount - 1]['type'] == 'ARRAY') {
+ $this->_xh['valuestack'][$vscount - 1]['values'][] = $this->_xh['value'];
+ }
+ }
+ break;
+ case 'BOOLEAN':
+ case 'I4':
+ case 'I8':
+ case 'EX:I8':
+ case 'INT':
+ case 'STRING':
+ case 'DOUBLE':
+ case 'DATETIME.ISO8601':
+ case 'BASE64':
+ $this->_xh['vt'] = strtolower($name);
+ /// @todo: optimization creep - remove the if/elseif cycle below
+ /// since the case() in which we are already did that
+ if ($name == 'STRING') {
+ $this->_xh['value'] = $this->_xh['ac'];
+ } elseif ($name == 'DATETIME.ISO8601') {
+ if (!preg_match('/^[0-9]{8}T[0-9]{2}:[0-9]{2}:[0-9]{2}$/', $this->_xh['ac'])) {
+ error_log('XML-RPC: ' . __METHOD__ . ': invalid value received in DATETIME: ' . $this->_xh['ac']);
+ }
+ $this->_xh['vt'] = Value::$xmlrpcDateTime;
+ $this->_xh['value'] = $this->_xh['ac'];
+ } elseif ($name == 'BASE64') {
+ /// @todo check for failure of base64 decoding / catch warnings
+ $this->_xh['value'] = base64_decode($this->_xh['ac']);
+ } elseif ($name == 'BOOLEAN') {
+ // special case here: we translate boolean 1 or 0 into PHP
+ // constants true or false.
+ // Strings 'true' and 'false' are accepted, even though the
+ // spec never mentions them (see eg. Blogger api docs)
+ // NB: this simple checks helps a lot sanitizing input, ie no
+ // security problems around here
+ if ($this->_xh['ac'] == '1' || strcasecmp($this->_xh['ac'], 'true') == 0) {
+ $this->_xh['value'] = true;
+ } else {
+ // log if receiving something strange, even though we set the value to false anyway
+ if ($this->_xh['ac'] != '0' && strcasecmp($this->_xh['ac'], 'false') != 0) {
+ error_log('XML-RPC: ' . __METHOD__ . ': invalid value received in BOOLEAN: ' . $this->_xh['ac']);
+ }
+ $this->_xh['value'] = false;
+ }
+ } elseif ($name == 'DOUBLE') {
+ // we have a DOUBLE
+ // we must check that only 0123456789-.<space> are characters here
+ // NOTE: regexp could be much stricter than this...
+ if (!preg_match('/^[+-eE0123456789 \t.]+$/', $this->_xh['ac'])) {
+ /// @todo: find a better way of throwing an error than this!
+ error_log('XML-RPC: ' . __METHOD__ . ': non numeric value received in DOUBLE: ' . $this->_xh['ac']);
+ $this->_xh['value'] = 'ERROR_NON_NUMERIC_FOUND';
+ } else {
+ // it's ok, add it on
+ $this->_xh['value'] = (double)$this->_xh['ac'];
+ }
+ } else {
+ // we have an I4/I8/INT
+ // we must check that only 0123456789-<space> are characters here
+ if (!preg_match('/^[+-]?[0123456789 \t]+$/', $this->_xh['ac'])) {
+ /// @todo find a better way of throwing an error than this!
+ error_log('XML-RPC: ' . __METHOD__ . ': non numeric value received in INT: ' . $this->_xh['ac']);
+ $this->_xh['value'] = 'ERROR_NON_NUMERIC_FOUND';
+ } else {
+ // it's ok, add it on
+ $this->_xh['value'] = (int)$this->_xh['ac'];
+ }
+ }
+ $this->_xh['lv'] = 3; // indicate we've found a value
+ break;
+ case 'NAME':
+ $this->_xh['valuestack'][count($this->_xh['valuestack']) - 1]['name'] = $this->_xh['ac'];
+ break;
+ case 'MEMBER':
+ // add to array in the stack the last element built,
+ // unless no VALUE was found
+ if ($this->_xh['vt']) {
+ $vscount = count($this->_xh['valuestack']);
+ $this->_xh['valuestack'][$vscount - 1]['values'][$this->_xh['valuestack'][$vscount - 1]['name']] = $this->_xh['value'];
+ } else {
+ error_log('XML-RPC: ' . __METHOD__ . ': missing VALUE inside STRUCT in received xml');
+ }
+ break;
+ case 'DATA':
+ $this->_xh['vt'] = null; // reset this to check for 2 data elements in a row - even if they're empty
+ break;
+ case 'STRUCT':
+ case 'ARRAY':
+ // fetch out of stack array of values, and promote it to current value
+ $currVal = array_pop($this->_xh['valuestack']);
+ $this->_xh['value'] = $currVal['values'];
+ $this->_xh['vt'] = strtolower($name);
+ if (isset($currVal['php_class'])) {
+ $this->_xh['php_class'] = $currVal['php_class'];
+ }
+ break;
+ case 'PARAM':
+ // add to array of params the current value,
+ // unless no VALUE was found
+ if ($this->_xh['vt']) {
+ $this->_xh['params'][] = $this->_xh['value'];
+ $this->_xh['pt'][] = $this->_xh['vt'];
+ } else {
+ error_log('XML-RPC: ' . __METHOD__ . ': missing VALUE inside PARAM in received xml');
+ }
+ break;
+ case 'METHODNAME':
+ $this->_xh['method'] = preg_replace('/^[\n\r\t ]+/', '', $this->_xh['ac']);
+ break;
+ case 'NIL':
+ case 'EX:NIL':
+ if (PhpXmlRpc::$xmlrpc_null_extension) {
+ $this->_xh['vt'] = 'null';
+ $this->_xh['value'] = null;
+ $this->_xh['lv'] = 3;
+ break;
+ }
+ // drop through intentionally if nil extension not enabled
+ case 'PARAMS':
+ case 'FAULT':
+ case 'METHODCALL':
+ case 'METHORESPONSE':
+ break;
+ default:
+ // End of INVALID ELEMENT!
+ // shall we add an assert here for unreachable code???
+ break;
+ }
+ }
+ }
+
+ /**
+ * Used in decoding xmlrpc requests/responses without rebuilding xmlrpc Values.
+ */
+ public function xmlrpc_ee_fast($parser, $name)
+ {
+ $this->xmlrpc_ee($parser, $name, false);
+ }
+
+ /**
+ * xml parser handler function for character data.
+ */
+ public function xmlrpc_cd($parser, $data)
+ {
+ // skip processing if xml fault already detected
+ if ($this->_xh['isf'] < 2) {
+ // "lookforvalue==3" means that we've found an entire value
+ // and should discard any further character data
+ if ($this->_xh['lv'] != 3) {
+ $this->_xh['ac'] .= $data;
+ }
+ }
+ }
+
+ /**
+ * xml parser handler function for 'other stuff', ie. not char data or
+ * element start/end tag. In fact it only gets called on unknown entities...
+ */
+ public function xmlrpc_dh($parser, $data)
+ {
+ // skip processing if xml fault already detected
+ if ($this->_xh['isf'] < 2) {
+ if (substr($data, 0, 1) == '&' && substr($data, -1, 1) == ';') {
+ $this->_xh['ac'] .= $data;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * xml charset encoding guessing helper function.
+ * Tries to determine the charset encoding of an XML chunk received over HTTP.
+ * NB: according to the spec (RFC 3023), if text/xml content-type is received over HTTP without a content-type,
+ * we SHOULD assume it is strictly US-ASCII. But we try to be more tolerant of non conforming (legacy?) clients/servers,
+ * which will be most probably using UTF-8 anyway...
+ * In order of importance checks:
+ * 1. http headers
+ * 2. BOM
+ * 3. XML declaration
+ * 4. guesses using mb_detect_encoding()
+ *
+ * @param string $httpHeader the http Content-type header
+ * @param string $xmlChunk xml content buffer
+ * @param string $encodingPrefs comma separated list of character encodings to be used as default (when mb extension is enabled).
+ * This can also be set globally using PhpXmlRpc::$xmlrpc_detectencodings
+ * @return string the encoding determined. Null if it can't be determined and mbstring is enabled,
+ * PhpXmlRpc::$xmlrpc_defencoding if it can't be determined and mbstring is not enabled
+ *
+ * @todo explore usage of mb_http_input(): does it detect http headers + post data? if so, use it instead of hand-detection!!!
+ */
+ public static function guessEncoding($httpHeader = '', $xmlChunk = '', $encodingPrefs = null)
+ {
+ // discussion: see http://www.yale.edu/pclt/encoding/
+ // 1 - test if encoding is specified in HTTP HEADERS
+
+ // Details:
+ // LWS: (\13\10)?( |\t)+
+ // token: (any char but excluded stuff)+
+ // quoted string: " (any char but double quotes and control chars)* "
+ // header: Content-type = ...; charset=value(; ...)*
+ // where value is of type token, no LWS allowed between 'charset' and value
+ // Note: we do not check for invalid chars in VALUE:
+ // this had better be done using pure ereg as below
+ // Note 2: we might be removing whitespace/tabs that ought to be left in if
+ // the received charset is a quoted string. But nobody uses such charset names...
+
+ /// @todo this test will pass if ANY header has charset specification, not only Content-Type. Fix it?
+ $matches = array();
+ if (preg_match('/;\s*charset\s*=([^;]+)/i', $httpHeader, $matches)) {
+ return strtoupper(trim($matches[1], " \t\""));
+ }
+
+ // 2 - scan the first bytes of the data for a UTF-16 (or other) BOM pattern
+ // (source: http://www.w3.org/TR/2000/REC-xml-20001006)
+ // NOTE: actually, according to the spec, even if we find the BOM and determine
+ // an encoding, we should check if there is an encoding specified
+ // in the xml declaration, and verify if they match.
+ /// @todo implement check as described above?
+ /// @todo implement check for first bytes of string even without a BOM? (It sure looks harder than for cases WITH a BOM)
+ if (preg_match('/^(\x00\x00\xFE\xFF|\xFF\xFE\x00\x00|\x00\x00\xFF\xFE|\xFE\xFF\x00\x00)/', $xmlChunk)) {
+ return 'UCS-4';
+ } elseif (preg_match('/^(\xFE\xFF|\xFF\xFE)/', $xmlChunk)) {
+ return 'UTF-16';
+ } elseif (preg_match('/^(\xEF\xBB\xBF)/', $xmlChunk)) {
+ return 'UTF-8';
+ }
+
+ // 3 - test if encoding is specified in the xml declaration
+ // Details:
+ // SPACE: (#x20 | #x9 | #xD | #xA)+ === [ \x9\xD\xA]+
+ // EQ: SPACE?=SPACE? === [ \x9\xD\xA]*=[ \x9\xD\xA]*
+ if (preg_match('/^<\?xml\s+version\s*=\s*' . "((?:\"[a-zA-Z0-9_.:-]+\")|(?:'[a-zA-Z0-9_.:-]+'))" .
+ '\s+encoding\s*=\s*' . "((?:\"[A-Za-z][A-Za-z0-9._-]*\")|(?:'[A-Za-z][A-Za-z0-9._-]*'))/",
+ $xmlChunk, $matches)) {
+ return strtoupper(substr($matches[2], 1, -1));
+ }
+
+ // 4 - if mbstring is available, let it do the guesswork
+ if (extension_loaded('mbstring')) {
+ if ($encodingPrefs == null && PhpXmlRpc::$xmlrpc_detectencodings != null) {
+ $encodingPrefs = PhpXmlRpc::$xmlrpc_detectencodings;
+ }
+ if ($encodingPrefs) {
+ $enc = mb_detect_encoding($xmlChunk, $encodingPrefs);
+ } else {
+ $enc = mb_detect_encoding($xmlChunk);
+ }
+ // NB: mb_detect likes to call it ascii, xml parser likes to call it US_ASCII...
+ // IANA also likes better US-ASCII, so go with it
+ if ($enc == 'ASCII') {
+ $enc = 'US-' . $enc;
+ }
+
+ return $enc;
+ } else {
+ // no encoding specified: as per HTTP1.1 assume it is iso-8859-1?
+ // Both RFC 2616 (HTTP 1.1) and 1945 (HTTP 1.0) clearly state that for text/xxx content types
+ // this should be the standard. And we should be getting text/xml as request and response.
+ // BUT we have to be backward compatible with the lib, which always used UTF-8 as default...
+ return PhpXmlRpc::$xmlrpc_defencoding;
+ }
+ }
+
+ /**
+ * Helper function: checks if an xml chunk as a charset declaration (BOM or in the xml declaration)
+ *
+ * @param string $xmlChunk
+ * @return bool
+ */
+ public static function hasEncoding($xmlChunk)
+ {
+ // scan the first bytes of the data for a UTF-16 (or other) BOM pattern
+ // (source: http://www.w3.org/TR/2000/REC-xml-20001006)
+ if (preg_match('/^(\x00\x00\xFE\xFF|\xFF\xFE\x00\x00|\x00\x00\xFF\xFE|\xFE\xFF\x00\x00)/', $xmlChunk)) {
+ return true;
+ } elseif (preg_match('/^(\xFE\xFF|\xFF\xFE)/', $xmlChunk)) {
+ return true;
+ } elseif (preg_match('/^(\xEF\xBB\xBF)/', $xmlChunk)) {
+ return true;
+ }
+
+ // test if encoding is specified in the xml declaration
+ // Details:
+ // SPACE: (#x20 | #x9 | #xD | #xA)+ === [ \x9\xD\xA]+
+ // EQ: SPACE?=SPACE? === [ \x9\xD\xA]*=[ \x9\xD\xA]*
+ if (preg_match('/^<\?xml\s+version\s*=\s*' . "((?:\"[a-zA-Z0-9_.:-]+\")|(?:'[a-zA-Z0-9_.:-]+'))" .
+ '\s+encoding\s*=\s*' . "((?:\"[A-Za-z][A-Za-z0-9._-]*\")|(?:'[A-Za-z][A-Za-z0-9._-]*'))/",
+ $xmlChunk, $matches)) {
+ return true;
+ }
+
+ return false;
+ }
+}
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