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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\XML\ds; |
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use DOMElement; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XML\Exception\InvalidDOMElementException; |
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use SimpleSAML\XMLSecurity\Exception\InvalidArgumentException; |
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use SimpleSAML\XMLSecurity\Utils\XPath as XPathUtils; |
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use function str_replace; |
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/** |
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* Class implementing the XPath element. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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class XPath extends AbstractDsElement |
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{ |
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/** |
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* Construct an XPath element. |
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* |
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* @param string $expression The XPath expression itself. |
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* @param string[] $namespaces A key - value array with namespace definitions. |
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*/ |
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final public function __construct( |
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protected string $expression, |
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protected array $namespaces = [], |
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) { |
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Assert::allString($namespaces, InvalidArgumentException::class); |
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Assert::allString(array_keys($namespaces, InvalidArgumentException::class)); |
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} |
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/** |
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* Get the actual XPath expression. |
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* |
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* @return string |
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*/ |
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public function getExpression(): string |
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{ |
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return $this->expression; |
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} |
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/** |
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* Get the list of namespaces used in this XPath expression, with their corresponding prefix as |
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* the keys of each element in the array. |
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* |
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* @return string[] |
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*/ |
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public function getNamespaces(): array |
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{ |
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return $this->namespaces; |
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} |
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/** |
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* Convert XML into a class instance |
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* |
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* @param DOMElement $xml |
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* @return static |
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* |
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* @throws \SimpleSAML\XML\Exception\InvalidDOMElementException |
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* If the qualified name of the supplied element is wrong |
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*/ |
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public static function fromXML(DOMElement $xml): static |
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{ |
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Assert::same($xml->localName, 'XPath', InvalidDOMElementException::class); |
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Assert::same($xml->namespaceURI, self::NS, InvalidDOMElementException::class); |
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$namespaces = []; |
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$xpath = XPathUtils::getXPath($xml->ownerDocument); |
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foreach (XPathUtils::xpQuery($xml, './namespace::*', $xpath) as $ns) { |
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if ($xml->getAttributeNode($ns->nodeName)) { |
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// only add namespaces when they are defined explicitly in an attribute |
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$namespaces[$ns->localName] = $xml->getAttribute($ns->nodeName); |
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} |
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} |
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return new static($xml->textContent, $namespaces); |
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} |
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/** |
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* @param DOMElement|null $parent |
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* @return DOMElement |
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*/ |
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public function toXML(DOMElement $parent = null): DOMElement |
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{ |
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$e = $this->instantiateParentElement($parent); |
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$e->textContent = $this->getExpression(); |
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foreach ($this->getNamespaces() as $prefix => $namespace) { |
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$e->setAttribute('xmlns:' . $prefix, $namespace); |
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} |
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return $e; |
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} |
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} |
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simplesamlphp /
xml-security
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