365 lines
9.2 KiB
PHP
365 lines
9.2 KiB
PHP
<?php
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/**
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* XML-parsing classes to wrap the domxml and DOM extensions for PHP 4
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* and 5, respectively.
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*
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* @package OpenID
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*/
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/**
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* The base class for wrappers for available PHP XML-parsing
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* extensions. To work with this Yadis library, subclasses of this
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* class MUST implement the API as defined in the remarks for this
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* class. Subclasses of Auth_Yadis_XMLParser are used to wrap
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* particular PHP XML extensions such as 'domxml'. These are used
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* internally by the library depending on the availability of
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* supported PHP XML extensions.
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*
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* @package OpenID
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*/
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class Auth_Yadis_XMLParser {
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/**
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* Initialize an instance of Auth_Yadis_XMLParser with some
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* XML and namespaces. This SHOULD NOT be overridden by
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* subclasses.
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*
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* @param string $xml_string A string of XML to be parsed.
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* @param array $namespace_map An array of ($ns_name => $ns_uri)
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* to be registered with the XML parser. May be empty.
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* @return boolean $result True if the initialization and
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* namespace registration(s) succeeded; false otherwise.
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*/
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function init($xml_string, $namespace_map)
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{
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if (!$this->setXML($xml_string)) {
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return false;
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}
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foreach ($namespace_map as $prefix => $uri) {
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if (!$this->registerNamespace($prefix, $uri)) {
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return false;
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}
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}
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return true;
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}
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/**
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* Register a namespace with the XML parser. This should be
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* overridden by subclasses.
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*
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* @param string $prefix The namespace prefix to appear in XML tag
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* names.
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*
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* @param string $uri The namespace URI to be used to identify the
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* namespace in the XML.
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*
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* @return boolean $result True if the registration succeeded;
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* false otherwise.
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*/
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function registerNamespace($prefix, $uri)
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{
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// Not implemented.
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}
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/**
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* Set this parser object's XML payload. This should be
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* overridden by subclasses.
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*
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* @param string $xml_string The XML string to pass to this
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* object's XML parser.
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*
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* @return boolean $result True if the initialization succeeded;
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* false otherwise.
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*/
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function setXML($xml_string)
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{
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// Not implemented.
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}
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/**
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* Evaluate an XPath expression and return the resulting node
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* list. This should be overridden by subclasses.
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*
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* @param string $xpath The XPath expression to be evaluated.
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*
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* @param mixed $node A node object resulting from a previous
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* evalXPath call. This node, if specified, provides the context
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* for the evaluation of this xpath expression.
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*
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* @return array $node_list An array of matching opaque node
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* objects to be used with other methods of this parser class.
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*/
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function &evalXPath($xpath, $node = null)
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{
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// Not implemented.
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}
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/**
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* Return the textual content of a specified node.
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*
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* @param mixed $node A node object from a previous call to
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* $this->evalXPath().
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*
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* @return string $content The content of this node.
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*/
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function content($node)
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{
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// Not implemented.
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}
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/**
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* Return the attributes of a specified node.
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*
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* @param mixed $node A node object from a previous call to
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* $this->evalXPath().
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*
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* @return array $attrs An array mapping attribute names to
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* values.
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*/
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function attributes($node)
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{
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// Not implemented.
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}
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}
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/**
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* This concrete implementation of Auth_Yadis_XMLParser implements
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* the appropriate API for the 'domxml' extension which is typically
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* packaged with PHP 4. This class will be used whenever the 'domxml'
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* extension is detected. See the Auth_Yadis_XMLParser class for
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* details on this class's methods.
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*
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* @package OpenID
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*/
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class Auth_Yadis_domxml extends Auth_Yadis_XMLParser {
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function Auth_Yadis_domxml()
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{
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$this->xml = null;
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$this->doc = null;
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$this->xpath = null;
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$this->errors = array();
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}
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function setXML($xml_string)
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{
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$this->xml = $xml_string;
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$this->doc = @domxml_open_mem($xml_string, DOMXML_LOAD_PARSING,
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$this->errors);
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if (!$this->doc) {
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return false;
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}
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$this->xpath = $this->doc->xpath_new_context();
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return true;
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}
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function registerNamespace($prefix, $uri)
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{
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return xpath_register_ns($this->xpath, $prefix, $uri);
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}
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function &evalXPath($xpath, $node = null)
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{
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if ($node) {
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$result = @$this->xpath->xpath_eval($xpath, $node);
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} else {
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$result = @$this->xpath->xpath_eval($xpath);
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}
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if (!$result) {
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$n = array();
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return $n;
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}
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if (!$result->nodeset) {
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$n = array();
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return $n;
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}
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return $result->nodeset;
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}
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function content($node)
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{
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if ($node) {
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return $node->get_content();
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}
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}
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function attributes($node)
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{
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if ($node) {
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$arr = $node->attributes();
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$result = array();
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if ($arr) {
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foreach ($arr as $attrnode) {
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$result[$attrnode->name] = $attrnode->value;
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}
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}
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return $result;
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}
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}
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}
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/**
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* This concrete implementation of Auth_Yadis_XMLParser implements
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* the appropriate API for the 'dom' extension which is typically
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* packaged with PHP 5. This class will be used whenever the 'dom'
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* extension is detected. See the Auth_Yadis_XMLParser class for
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* details on this class's methods.
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*
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* @package OpenID
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*/
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class Auth_Yadis_dom extends Auth_Yadis_XMLParser {
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function Auth_Yadis_dom()
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{
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$this->xml = null;
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$this->doc = null;
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$this->xpath = null;
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$this->errors = array();
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}
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function setXML($xml_string)
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{
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$this->xml = $xml_string;
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$this->doc = new DOMDocument;
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if (!$this->doc) {
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return false;
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}
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// libxml_disable_entity_loader (PHP 5 >= 5.2.11)
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if (function_exists('libxml_disable_entity_loader') && function_exists('libxml_use_internal_errors')) {
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// disable external entities and libxml errors
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$loader = libxml_disable_entity_loader(true);
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$errors = libxml_use_internal_errors(true);
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$parse_result = @$this->doc->loadXML($xml_string);
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libxml_disable_entity_loader($loader);
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libxml_use_internal_errors($errors);
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} else {
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$parse_result = @$this->doc->loadXML($xml_string);
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}
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if (!$parse_result) {
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return false;
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}
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$this->xpath = new DOMXPath($this->doc);
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if ($this->xpath) {
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return true;
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} else {
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return false;
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}
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}
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function registerNamespace($prefix, $uri)
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{
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return $this->xpath->registerNamespace($prefix, $uri);
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}
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function &evalXPath($xpath, $node = null)
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{
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if ($node) {
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$result = @$this->xpath->query($xpath, $node);
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} else {
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$result = @$this->xpath->query($xpath);
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}
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$n = array();
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if (!$result) {
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return $n;
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}
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for ($i = 0; $i < $result->length; $i++) {
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$n[] = $result->item($i);
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}
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return $n;
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}
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function content($node)
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{
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if ($node) {
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return $node->textContent;
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}
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}
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function attributes($node)
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{
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if ($node) {
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$arr = $node->attributes;
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$result = array();
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if ($arr) {
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for ($i = 0; $i < $arr->length; $i++) {
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$node = $arr->item($i);
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$result[$node->nodeName] = $node->nodeValue;
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}
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}
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return $result;
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}
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}
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}
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global $__Auth_Yadis_defaultParser;
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$__Auth_Yadis_defaultParser = null;
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/**
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* Set a default parser to override the extension-driven selection of
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* available parser classes. This is helpful in a test environment or
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* one in which multiple parsers can be used but one is more
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* desirable.
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*
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* @param Auth_Yadis_XMLParser $parser An instance of a
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* Auth_Yadis_XMLParser subclass.
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*/
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function Auth_Yadis_setDefaultParser($parser)
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{
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global $__Auth_Yadis_defaultParser;
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$__Auth_Yadis_defaultParser = $parser;
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}
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function Auth_Yadis_getSupportedExtensions()
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{
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return array('dom' => 'Auth_Yadis_dom',
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'domxml' => 'Auth_Yadis_domxml');
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}
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/**
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* Returns an instance of a Auth_Yadis_XMLParser subclass based on
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* the availability of PHP extensions for XML parsing. If
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* Auth_Yadis_setDefaultParser has been called, the parser used in
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* that call will be returned instead.
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*/
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function Auth_Yadis_getXMLParser()
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{
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global $__Auth_Yadis_defaultParser;
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if (isset($__Auth_Yadis_defaultParser)) {
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return $__Auth_Yadis_defaultParser;
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}
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foreach(Auth_Yadis_getSupportedExtensions() as $extension => $classname)
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{
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if (extension_loaded($extension))
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{
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$p = new $classname();
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Auth_Yadis_setDefaultParser($p);
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return $p;
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}
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}
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return false;
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}
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