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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XML\Registry; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XML\AbstractElement; |
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use SimpleSAML\XML\Exception\InvalidDOMElementException; |
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use SimpleSAML\XML\Exception\IOException; |
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use Symfony\Component\Finder\Finder; |
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use function array_merge_recursive; |
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use function dirname; |
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use function file_exists; |
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final class ElementRegistry |
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{ |
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/** @var \SimpleSAML\XML\Registry\ElementRegistry|null $instance */ |
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private static ?ElementRegistry $instance = null; |
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/** @var array<string, array<string, string>> */ |
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private array $registry = []; |
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private function __construct() |
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{ |
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// Initialize the registry with all the elements we know |
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$classesDir = dirname(__FILE__, 6) . '/vendor/simplesamlphp/composer-xmlprovider-installer/classes'; |
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if (file_exists($classesDir) === true) { |
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$finder = Finder::create()->files()->name('element.registry.*.php')->in($classesDir); |
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if ($finder->hasResults()) { |
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foreach ($finder as $file) { |
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$this->importFromFile($file->getPathName()); |
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} |
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} |
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} |
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} |
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public function importFromFile(string $file): void |
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{ |
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if (file_exists($file) === true) { |
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$elements = include($file); |
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$this->registry = array_merge_recursive($this->registry, $elements); |
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} else { |
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throw new IOException('File not found.'); |
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} |
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} |
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public static function getInstance(): ElementRegistry |
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{ |
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if (self::$instance === null) { |
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self::$instance = new static(); |
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} |
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return self::$instance; |
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} |
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/** |
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* Register a class that can process a certain XML-element. |
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* |
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* @param string $class The class name of a class extending AbstractElement. |
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*/ |
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public function registerElementHandler(string $class): void |
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{ |
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Assert::subclassOf($class, AbstractElement::class); |
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$className = AbstractElement::getClassName($class); |
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$namespace = $class::NS; |
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$this->registry[$namespace][$className] = $class; |
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} |
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/** |
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* Search for a class that implements an $element in the given $namespace. |
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* |
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* Such classes must have been registered previously by calling registerElementHandler(), and they must |
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* extend \SimpleSAML\XML\AbstractElement. |
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* |
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* @param string|null $namespace The namespace URI for the given element. |
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* @param string $element The local name of the element. |
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* |
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* @return string|null The fully-qualified name of a class extending \SimpleSAML\XML\AbstractElement and |
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* implementing support for the given element, or null if no such class has been registered before. |
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*/ |
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public function getElementHandler(?string $namespace, string $element): ?string |
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{ |
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Assert::nullOrValidURI($namespace, InvalidDOMElementException::class); |
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Assert::validNCName($element, InvalidDOMElementException::class); |
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return $this->registry[$namespace][$element] ?? null; |
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} |
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} |
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simplesamlphp /
xml-common
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