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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\Utils; |
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use DOMDocument; |
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use DOMElement; |
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use DOMNode; |
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use DOMXPath; |
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use SimpleSAML\XML\Utils\XPath as XPathUtils; |
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use SimpleSAML\XMLSecurity\Constants as C; |
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use SimpleSAML\XMLSecurity\Exception\RuntimeException; |
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/** |
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* Compilation of utilities for XPath. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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class XPath extends XPathUtils |
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{ |
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/** |
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* Get a DOMXPath object that can be used to search for XMLDSIG elements. |
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* |
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* @param \DOMNode $node The document to associate to the DOMXPath object. |
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* |
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* @return \DOMXPath A DOMXPath object ready to use in the given document, with the XMLDSIG namespace already |
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* registered. |
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*/ |
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public static function getXPath(DOMNode $node): DOMXPath |
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{ |
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$xp = parent::getXPath($node); |
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$xp->registerNamespace('ds', C::NS_XDSIG); |
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$xp->registerNamespace('xenc', C::NS_XENC); |
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return $xp; |
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} |
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/** |
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* Search for an element with a certain name among the children of a reference element. |
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* |
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* @param \DOMNode $ref The DOMDocument or DOMElement where encrypted data is expected to be found as a child. |
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* @param string $name The name (possibly prefixed) of the element we are looking for. |
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* |
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* @return \DOMElement|false The element we are looking for, or false when not found. |
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* |
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* @throws RuntimeException If no DOM document is available. |
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*/ |
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public static function findElement(DOMNode $ref, string $name): DOMElement|false |
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{ |
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$doc = $ref instanceof DOMDocument ? $ref : $ref->ownerDocument; |
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if ($doc === null) { |
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throw new RuntimeException('Cannot search, no DOM document available'); |
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} |
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$nodeset = self::getXPath($doc)->query('./' . $name, $ref); |
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return $nodeset->item(0) ?? false; |
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} |
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} |
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simplesamlphp /
xml-security
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