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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 DOMElement; |
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use SimpleSAML\XMLSecurity\Constants as C; |
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use SimpleSAML\XMLSecurity\XML\ds\Transforms; |
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use SimpleSAML\XPath\Constants as XPATH_C; |
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use function array_map; |
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use function is_null; |
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/** |
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* Class with utility methods for XML manipulation. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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class XML |
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{ |
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/** |
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* Canonicalize any given node. |
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* |
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* @param \DOMElement $element The DOM element that needs canonicalization. |
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* @param string $c14nMethod The identifier of the canonicalization algorithm to use. |
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* See \SimpleSAML\XMLSecurity\Constants. |
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* @param string[]|null $xpaths An array of xpaths to filter the nodes by. Defaults to null (no filters). |
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* @param string[]|null $prefixes An array of namespace prefixes to filter the nodes by. |
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* Defaults to null (no filters). |
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* |
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* @return string The canonical representation of the given DOM node, according to the algorithm requested. |
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*/ |
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public static function canonicalizeData( |
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DOMElement $element, |
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string $c14nMethod, |
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?array $xpaths = null, |
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?array $prefixes = null, |
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): string { |
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$withComments = match ($c14nMethod) { |
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C::C14N_EXCLUSIVE_WITH_COMMENTS, C::C14N_INCLUSIVE_WITH_COMMENTS => true, |
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default => false, |
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}; |
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$exclusive = match ($c14nMethod) { |
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C::C14N_EXCLUSIVE_WITH_COMMENTS, C::C14N_EXCLUSIVE_WITHOUT_COMMENTS => true, |
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default => false, |
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}; |
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if ( |
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is_null($xpaths) |
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&& ($element->ownerDocument !== null) |
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&& ($element->ownerDocument->documentElement !== null) |
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&& $element->isSameNode($element->ownerDocument->documentElement) |
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) { |
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// check for any PI or comments as they would have been excluded |
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$current = $element; |
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for ($refNode = $current->previousSibling; $refNode !== null; $current = $refNode) { |
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if ( |
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(($refNode->nodeType === XML_COMMENT_NODE) && $withComments) |
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|| $refNode->nodeType === XML_PI_NODE |
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) { |
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break; |
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} |
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} |
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if ($refNode === null) { |
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$element = $element->ownerDocument; |
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} |
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} |
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return $element->C14N($exclusive, $withComments, $xpaths, $prefixes); |
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} |
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/** |
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* Process all transforms specified by a given Reference element. |
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* |
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* @param \SimpleSAML\XMLSecurity\XML\ds\Transforms $transforms The transforms to apply. |
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* @param \DOMElement $data The data referenced. |
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* |
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* @return string The canonicalized data after applying all transforms specified by $ref. |
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* |
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* @see http://www.w3.org/TR/xmldsig-core/#sec-ReferenceProcessingModel |
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*/ |
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public static function processTransforms( |
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Transforms $transforms, |
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DOMElement $data, |
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): string { |
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$canonicalMethod = C::C14N_EXCLUSIVE_WITHOUT_COMMENTS; |
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$arXPath = null; |
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$prefixList = null; |
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foreach ($transforms->getTransform() as $transform) { |
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$canonicalMethod = $transform->getAlgorithm()->getValue(); |
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switch ($canonicalMethod) { |
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case C::C14N_EXCLUSIVE_WITHOUT_COMMENTS: |
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case C::C14N_EXCLUSIVE_WITH_COMMENTS: |
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$inclusiveNamespaces = $transform->getInclusiveNamespaces(); |
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if ($inclusiveNamespaces !== null) { |
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$prefixes = $inclusiveNamespaces->getPrefixes(); |
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if ($prefixes !== null) { |
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$prefixList = array_map('strval', $prefixes->toArray()); |
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} |
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} |
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break; |
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case XPATH_C::XPATH10_URI: |
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$xpath = $transform->getXPath(); |
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if ($xpath !== null) { |
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$arXPath = []; |
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$arXPath['query'] = '(.//. | .//@* | .//namespace::*)[' . $xpath->getExpression() . ']'; |
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// $arXpath['namespaces'] = $xpath->getNamespaces(); |
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// TODO: review if $nsnode->localName is equivalent to the keys in getNamespaces() |
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// $nslist = $xp->query('./namespace::*', $node); |
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// foreach ($nslist as $nsnode) { |
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// if ($nsnode->localName != "xml") { |
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// $arXPath['namespaces'][$nsnode->localName] = $nsnode->nodeValue; |
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// } |
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// } |
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} |
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break; |
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} |
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} |
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return self::canonicalizeData($data, $canonicalMethod, $arXPath, $prefixList); |
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} |
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} |
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simplesamlphp /
xml-security
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