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<?php |
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declare(strict_types=1); |
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namespace SimpleSAML\XMLSecurity\Alg; |
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use SimpleSAML\Assert\Assert; |
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use SimpleSAML\XMLSecurity\Exception\BlacklistedAlgorithmException; |
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use SimpleSAML\XMLSecurity\Exception\UnsupportedAlgorithmException; |
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use SimpleSAML\XMLSecurity\Key\AbstractKey; |
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/** |
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* An abstract class implementing an algorithm factory. |
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* |
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* Extending classes MUST declare two static properties: |
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* |
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* - $cache: an associative array holding algorithm IDs as the keys, and class names implementing those algorithms as |
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* the value. |
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* - $initialized: a boolean telling whether this factory has been initialized (a constructor has been called) or not. |
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* |
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* @package simplesamlphp/xml-security |
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*/ |
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abstract class AbstractAlgorithmFactory |
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{ |
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/** |
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* An array of blacklisted algorithms. |
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* |
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* @var string[] |
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*/ |
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protected array $blacklist = []; |
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/** |
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* Build a factory that creates algorithms. |
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* |
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* @param string[]|null $blacklist A list of algorithms forbidden for their use. |
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* @param string[]|null $defaults A list of known implementations. |
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*/ |
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public function __construct(array $blacklist = null, array $defaults = null) |
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{ |
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if ($blacklist !== null) { |
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$this->blacklist = $blacklist; |
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} |
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// initialize the cache for supported algorithms per known implementation |
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if (!static::$initialized && $defaults !== null) { |
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foreach ($defaults as $algorithm) { |
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/** @var \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface $algorithm */ |
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foreach ($algorithm::getSupportedAlgorithms() as $algId) { |
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if (array_key_exists($algId, static::$cache)) { |
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/* |
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* If the key existed before initialization, that means someone registered a handler for this |
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* algorithm, so we should respect that and skip registering the default here. |
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*/ |
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continue; |
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} |
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static::$cache[$algId] = $algorithm; |
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} |
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} |
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static::$initialized = true; |
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} |
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} |
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/** |
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* Get a new object implementing the given algorithm. |
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* |
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* @param string $algId The identifier of the algorithm desired. |
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* @param \SimpleSAML\XMLSecurity\Key\AbstractKey $key The key to use with the given algorithm. |
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* |
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* @return \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface An object implementing the given algorithm. |
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* |
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* @throws \SimpleSAML\XMLSecurity\Exception\InvalidArgumentException If an error occurs, e.g. the given algorithm |
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* is blacklisted, unknown or the given key is not suitable for it. |
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*/ |
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public function getAlgorithm(string $algId, AbstractKey $key): AlgorithmInterface |
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{ |
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Assert::true( |
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!in_array($algId, $this->blacklist, true), |
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sprintf('Blacklisted algorithm: \'%s\'.', $algId), |
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BlacklistedAlgorithmException::class |
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); |
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Assert::keyExists( |
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static::$cache, |
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$algId, |
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sprintf('Unknown or unsupported algorithm: \'%s\'.', $algId), |
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UnsupportedAlgorithmException::class |
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); |
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return new static::$cache[$algId]($key, $algId); |
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} |
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/** |
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* Get the name of the abstract class our algorithm implementations must extend. |
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* |
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* @return string |
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*/ |
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abstract protected static function getExpectedParent(): string; |
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/** |
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* Register an implementation of some algorithm(s) for its use. |
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* |
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* @param string $className |
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*/ |
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public static function registerAlgorithm(string $className): void |
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{ |
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$parent = static::getExpectedParent(); |
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Assert::subclassOf( |
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$className, |
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$parent, |
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'Cannot register algorithm "' . $className . '", must implement ' . $parent . '.' |
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); |
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/** @var \SimpleSAML\XMLSecurity\Alg\AlgorithmInterface $className */ |
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foreach ($className::getSupportedAlgorithms() as $algId) { |
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static::$cache[$algId] = $className; |
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} |
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} |
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} |
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simplesamlphp /
xml-security
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