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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XML; |
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use DOMElement; |
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use RuntimeException; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XML\Attribute; |
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use SimpleSAML\XML\Constants as C; |
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use function array_diff; |
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use function array_map; |
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use function array_search; |
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use function defined; |
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use function implode; |
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use function is_array; |
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use function rtrim; |
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use function sprintf; |
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/** |
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* Trait for elements that can have arbitrary namespaced attributes. |
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* |
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* @package simplesamlphp/xml-common |
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*/ |
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trait ExtendableAttributesTrait |
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{ |
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/** |
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* Extra (namespace qualified) attributes. |
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* |
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* @var list<\SimpleSAML\XML\Attribute> |
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*/ |
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protected array $namespacedAttributes = []; |
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/** |
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* Check if a namespace-qualified attribute exists. |
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* |
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* @param string|null $namespaceURI The namespace URI. |
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* @param string $localName The local name. |
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* @return bool true if the attribute exists, false if not. |
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*/ |
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public function hasAttributeNS(?string $namespaceURI, string $localName): bool |
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{ |
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foreach ($this->getAttributesNS() as $attr) { |
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if ($attr->getNamespaceURI() === $namespaceURI && $attr->getAttrName() === $localName) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* Get a namespace-qualified attribute. |
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* |
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* @param string|null $namespaceURI The namespace URI. |
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* @param string $localName The local name. |
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* @return \SimpleSAML\XML\Attribute|null The value of the attribute, or null if the attribute does not exist. |
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*/ |
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public function getAttributeNS(?string $namespaceURI, string $localName): ?Attribute |
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{ |
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foreach ($this->getAttributesNS() as $attr) { |
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if ($attr->getNamespaceURI() === $namespaceURI && $attr->getAttrName() === $localName) { |
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return $attr; |
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} |
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} |
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return null; |
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} |
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/** |
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* Get the namespaced attributes in this element. |
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* |
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* @return list<\SimpleSAML\XML\Attribute> |
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*/ |
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public function getAttributesNS(): array |
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{ |
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return $this->namespacedAttributes; |
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} |
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/** |
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* Parse an XML document and get the namespaced attributes from the specified namespace(s). |
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* The namespace defaults to the XS_ANY_ATTR_NAMESPACE constant on the element. |
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* NOTE: In case the namespace is ##any, this method will also return local non-namespaced attributes! |
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* |
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* @param \DOMElement $xml |
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* @param string|array|null $namespace |
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* |
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* @return list<\SimpleSAML\XML\Attribute> $attributes |
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*/ |
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protected static function getAttributesNSFromXML(DOMElement $xml, string|array $namespace = null): array |
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{ |
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$namespace = $namespace ?? static::XS_ANY_ATTR_NAMESPACE; |
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$attributes = []; |
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// Validate namespace value |
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if (!is_array($namespace)) { |
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// Must be one of the predefined values |
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Assert::oneOf($namespace, C::XS_ANY_NS); |
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if ($namespace === C::XS_ANY_NS_ANY) { |
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foreach ($xml->attributes as $a) { |
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$attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue); |
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} |
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} elseif ($namespace === C::XS_ANY_NS_LOCAL) { |
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foreach ($xml->attributes as $a) { |
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if ($a->namespaceURI === null) { |
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$attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue); |
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} |
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} |
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} elseif ($namespace === C::XS_ANY_NS_OTHER) { |
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foreach ($xml->attributes as $a) { |
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if ($a->namespaceURI !== static::NS) { |
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$attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue); |
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} |
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} |
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} elseif ($namespace === C::XS_ANY_NS_TARGET) { |
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foreach ($xml->attributes as $a) { |
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if ($a->namespaceURI === static::NS) { |
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$attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue); |
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} |
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} |
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} |
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} else { |
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// Array must be non-empty and cannot contain ##any or ##other |
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Assert::notEmpty($namespace); |
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Assert::allStringNotEmpty($namespace); |
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Assert::allNotSame($namespace, C::XS_ANY_NS_ANY); |
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Assert::allNotSame($namespace, C::XS_ANY_NS_OTHER); |
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// Replace the ##targetedNamespace with the actual namespace |
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if (($key = array_search(C::XS_ANY_NS_TARGET, $namespace)) !== false) { |
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$namespace[$key] = static::NS; |
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} |
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// Replace the ##local with null |
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if (($key = array_search(C::XS_ANY_NS_LOCAL, $namespace)) !== false) { |
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$namespace[$key] = null; |
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} |
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foreach ($xml->attributes as $a) { |
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if (in_array($a->namespaceURI, $namespace, true)) { |
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$attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue); |
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} |
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} |
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} |
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return $attributes; |
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} |
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/** |
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* @param list<\SimpleSAML\XML\Attribute> $attributes |
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* @throws \SimpleSAML\Assert\AssertionFailedException if $attributes contains anything other than Attribute objects |
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*/ |
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protected function setAttributesNS(array $attributes): void |
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{ |
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Assert::maxCount($attributes, C::UNBOUNDED_LIMIT); |
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Assert::allIsInstanceOf( |
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$attributes, |
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Attribute::class, |
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'Arbitrary XML attributes can only be an instance of Attribute.', |
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); |
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$namespace = $this->getAttributeNamespace(); |
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// Validate namespace value |
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if (!is_array($namespace)) { |
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// Must be one of the predefined values |
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Assert::oneOf($namespace, C::XS_ANY_NS); |
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} else { |
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// Array must be non-empty and cannot contain ##any or ##other |
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Assert::notEmpty($namespace); |
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Assert::allStringNotEmpty($namespace); |
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Assert::allNotSame($namespace, C::XS_ANY_NS_ANY); |
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Assert::allNotSame($namespace, C::XS_ANY_NS_OTHER); |
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} |
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// Get namespaces for all attributes |
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$actual_namespaces = array_map( |
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/** |
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* @param \SimpleSAML\XML\Attribute $elt |
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* @return string|null |
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*/ |
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function (Attribute $attr) { |
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return $attr->getNamespaceURI(); |
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}, |
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$attributes, |
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); |
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if ($namespace === C::XS_ANY_NS_LOCAL) { |
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// If ##local then all namespaces must be null |
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Assert::allNull($actual_namespaces); |
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} elseif (is_array($namespace)) { |
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// Make a local copy of the property that we can edit |
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$allowed_namespaces = $namespace; |
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// Replace the ##targetedNamespace with the actual namespace |
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if (($key = array_search(C::XS_ANY_NS_TARGET, $allowed_namespaces)) !== false) { |
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$allowed_namespaces[$key] = static::NS; |
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} |
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// Replace the ##local with null |
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if (($key = array_search(C::XS_ANY_NS_LOCAL, $allowed_namespaces)) !== false) { |
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$allowed_namespaces[$key] = null; |
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} |
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$diff = array_diff($actual_namespaces, $allowed_namespaces); |
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Assert::isEmpty( |
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$diff, |
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sprintf( |
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'Attributes from namespaces [ %s ] are not allowed inside a %s element.', |
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rtrim(implode(', ', $diff)), |
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static::NS, |
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), |
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); |
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} else { |
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// All attributes must be namespaced, ergo non-null |
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Assert::allNotNull($actual_namespaces); |
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if ($namespace === C::XS_ANY_NS_OTHER) { |
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// Must be any namespace other than the parent element |
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Assert::allNotSame($actual_namespaces, static::NS); |
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} elseif ($namespace === C::XS_ANY_NS_TARGET) { |
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// Must be the same namespace as the one of the parent element |
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Assert::allSame($actual_namespaces, static::NS); |
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} |
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} |
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$this->namespacedAttributes = $attributes; |
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} |
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/** |
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* @return array|string |
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*/ |
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public function getAttributeNamespace(): array|string |
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{ |
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Assert::true( |
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defined('static::XS_ANY_ATTR_NAMESPACE'), |
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self::getClassName(static::class) |
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. '::XS_ANY_ATTR_NAMESPACE constant must be defined and set to the namespace for the xs:anyAttribute.', |
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RuntimeException::class, |
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); |
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return static::XS_ANY_ATTR_NAMESPACE; |
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} |
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} |
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