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