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<?php |
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namespace Doctrine\Instantiator; |
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use Doctrine\Instantiator\Exception\InvalidArgumentException; |
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use Doctrine\Instantiator\Exception\UnexpectedValueException; |
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use Exception; |
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use ReflectionClass; |
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use ReflectionException; |
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use function class_exists; |
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use function restore_error_handler; |
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use function set_error_handler; |
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use function sprintf; |
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use function strlen; |
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use function unserialize; |
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/** |
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* {@inheritDoc} |
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*/ |
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final class Instantiator implements InstantiatorInterface |
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{ |
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/** |
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* Markers used internally by PHP to define whether {@see \unserialize} should invoke |
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* the method {@see \Serializable::unserialize()} when dealing with classes implementing |
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* the {@see \Serializable} interface. |
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*/ |
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public const SERIALIZATION_FORMAT_USE_UNSERIALIZER = 'C'; |
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public const SERIALIZATION_FORMAT_AVOID_UNSERIALIZER = 'O'; |
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/** |
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* Used to instantiate specific classes, indexed by class name. |
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* |
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* @var callable[] |
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*/ |
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private static $cachedInstantiators = []; |
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/** |
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* Array of objects that can directly be cloned, indexed by class name. |
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* |
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* @var object[] |
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*/ |
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private static $cachedCloneables = []; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function instantiate($className) |
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{ |
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if (isset(self::$cachedCloneables[$className])) { |
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return clone self::$cachedCloneables[$className]; |
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} |
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if (isset(self::$cachedInstantiators[$className])) { |
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$factory = self::$cachedInstantiators[$className]; |
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return $factory(); |
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} |
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return $this->buildAndCacheFromFactory($className); |
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} |
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/** |
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* Builds the requested object and caches it in static properties for performance |
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* |
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* @return object |
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*/ |
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private function buildAndCacheFromFactory(string $className) |
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{ |
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$factory = self::$cachedInstantiators[$className] = $this->buildFactory($className); |
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$instance = $factory(); |
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if ($this->isSafeToClone(new ReflectionClass($instance))) { |
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self::$cachedCloneables[$className] = clone $instance; |
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} |
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return $instance; |
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} |
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/** |
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* Builds a callable capable of instantiating the given $className without |
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* invoking its constructor. |
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* |
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* @throws InvalidArgumentException |
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* @throws UnexpectedValueException |
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* @throws ReflectionException |
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*/ |
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private function buildFactory(string $className) : callable |
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{ |
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$reflectionClass = $this->getReflectionClass($className); |
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if ($this->isInstantiableViaReflection($reflectionClass)) { |
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return [$reflectionClass, 'newInstanceWithoutConstructor']; |
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} |
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$serializedString = sprintf( |
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'%s:%d:"%s":0:{}', |
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self::SERIALIZATION_FORMAT_AVOID_UNSERIALIZER, |
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strlen($className), |
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$className |
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); |
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$this->checkIfUnSerializationIsSupported($reflectionClass, $serializedString); |
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return static function () use ($serializedString) { |
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return unserialize($serializedString); |
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}; |
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} |
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/** |
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* @param string $className |
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* |
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* @throws InvalidArgumentException |
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* @throws ReflectionException |
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*/ |
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private function getReflectionClass($className) : ReflectionClass |
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{ |
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if (! class_exists($className)) { |
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throw InvalidArgumentException::fromNonExistingClass($className); |
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} |
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$reflection = new ReflectionClass($className); |
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if ($reflection->isAbstract()) { |
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throw InvalidArgumentException::fromAbstractClass($reflection); |
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} |
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return $reflection; |
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} |
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/** |
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* @throws UnexpectedValueException |
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*/ |
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private function checkIfUnSerializationIsSupported(ReflectionClass $reflectionClass, string $serializedString) : void |
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{ |
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set_error_handler(static function ($code, $message, $file, $line) use ($reflectionClass, & $error) : void { |
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$error = UnexpectedValueException::fromUncleanUnSerialization( |
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$reflectionClass, |
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$message, |
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$code, |
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$file, |
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$line |
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); |
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}); |
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try { |
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$this->attemptInstantiationViaUnSerialization($reflectionClass, $serializedString); |
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} finally { |
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restore_error_handler(); |
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} |
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if ($error) { |
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throw $error; |
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} |
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1 |
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} |
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/** |
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* @throws UnexpectedValueException |
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*/ |
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private function attemptInstantiationViaUnSerialization(ReflectionClass $reflectionClass, string $serializedString) : void |
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{ |
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try { |
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unserialize($serializedString); |
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} catch (Exception $exception) { |
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throw UnexpectedValueException::fromSerializationTriggeredException($reflectionClass, $exception); |
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} |
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} |
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private function isInstantiableViaReflection(ReflectionClass $reflectionClass) : bool |
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{ |
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return ! ($this->hasInternalAncestors($reflectionClass) && $reflectionClass->isFinal()); |
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} |
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/** |
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* Verifies whether the given class is to be considered internal |
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*/ |
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private function hasInternalAncestors(ReflectionClass $reflectionClass) : bool |
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{ |
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do { |
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if ($reflectionClass->isInternal()) { |
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return true; |
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} |
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$reflectionClass = $reflectionClass->getParentClass(); |
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} while ($reflectionClass); |
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return false; |
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} |
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/** |
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* Checks if a class is cloneable |
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* |
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* Classes implementing `__clone` cannot be safely cloned, as that may cause side-effects. |
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*/ |
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private function isSafeToClone(ReflectionClass $reflection) : bool |
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{ |
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return $reflection->isCloneable() && ! $reflection->hasMethod('__clone'); |
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} |
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} |
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doctrine /
instantiator
