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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Serializer\Normalizer;
use Symfony\Component\Serializer\Exception\CircularReferenceException;
use Symfony\Component\Serializer\Exception\InvalidArgumentException;
use Symfony\Component\Serializer\Exception\LogicException;
use Symfony\Component\Serializer\Exception\MissingConstructorArgumentsException;
use Symfony\Component\Serializer\Exception\RuntimeException;
use Symfony\Component\Serializer\Mapping\AttributeMetadataInterface;
use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
use Symfony\Component\Serializer\SerializerAwareInterface;
use Symfony\Component\Serializer\SerializerAwareTrait;
/**
* Normalizer implementation.
*
* @author Kévin Dunglas <dunglas@gmail.com>
*/
abstract class AbstractNormalizer implements NormalizerInterface, DenormalizerInterface, SerializerAwareInterface, CacheableSupportsMethodInterface
{
use ObjectToPopulateTrait;
use SerializerAwareTrait;
/* constants to configure the context */
/**
* How many loops of circular reference to allow while normalizing.
*
* The default value of 1 means that when we encounter the same object a
* second time, we consider that a circular reference.
*
* You can raise this value for special cases, e.g. in combination with the
* max depth setting of the object normalizer.
*/
public const CIRCULAR_REFERENCE_LIMIT = 'circular_reference_limit';
/**
* Instead of creating a new instance of an object, update the specified object.
*
* If you have a nested structure, child objects will be overwritten with
* new instances unless you set DEEP_OBJECT_TO_POPULATE to true.
*/
public const OBJECT_TO_POPULATE = 'object_to_populate';
/**
* Only (de)normalize attributes that are in the specified groups.
*/
public const GROUPS = 'groups';
/**
* Limit (de)normalize to the specified names.
*
* For nested structures, this list needs to reflect the object tree.
*/
public const ATTRIBUTES = 'attributes';
/**
* If ATTRIBUTES are specified, and the source has fields that are not part of that list,
* either ignore those attributes (true) or throw an ExtraAttributesException (false).
*/
public const ALLOW_EXTRA_ATTRIBUTES = 'allow_extra_attributes';
/**
* Hashmap of default values for constructor arguments.
*
* The names need to match the parameter names in the constructor arguments.
*/
public const DEFAULT_CONSTRUCTOR_ARGUMENTS = 'default_constructor_arguments';
/**
* Hashmap of field name => callable to normalize this field.
*
* The callable is called if the field is encountered with the arguments:
*
* - mixed $attributeValue value of this field
* - object $object the whole object being normalized
* - string $attributeName name of the attribute being normalized
* - string $format the requested format
* - array $context the serialization context
*/
public const CALLBACKS = 'callbacks';
/**
* Handler to call when a circular reference has been detected.
*
* If you specify no handler, a CircularReferenceException is thrown.
*
* The method will be called with ($object, $format, $context) and its
* return value is returned as the result of the normalize call.
*/
public const CIRCULAR_REFERENCE_HANDLER = 'circular_reference_handler';
/**
* Skip the specified attributes when normalizing an object tree.
*
* This list is applied to each element of nested structures.
*
* Note: The behaviour for nested structures is different from ATTRIBUTES
* for historical reason. Aligning the behaviour would be a BC break.
*/
public const IGNORED_ATTRIBUTES = 'ignored_attributes';
/**
* @internal
*/
protected const CIRCULAR_REFERENCE_LIMIT_COUNTERS = 'circular_reference_limit_counters';
protected $defaultContext = [
self::ALLOW_EXTRA_ATTRIBUTES => true,
self::CIRCULAR_REFERENCE_HANDLER => null,
self::CIRCULAR_REFERENCE_LIMIT => 1,
self::IGNORED_ATTRIBUTES => [],
];
/**
* @var ClassMetadataFactoryInterface|null
*/
protected $classMetadataFactory;
/**
* @var NameConverterInterface|null
*/
protected $nameConverter;
/**
* Sets the {@link ClassMetadataFactoryInterface} to use.
*/
public function __construct(ClassMetadataFactoryInterface $classMetadataFactory = null, NameConverterInterface $nameConverter = null, array $defaultContext = [])
{
$this->classMetadataFactory = $classMetadataFactory;
$this->nameConverter = $nameConverter;
$this->defaultContext = array_merge($this->defaultContext, $defaultContext);
if (isset($this->defaultContext[self::CALLBACKS])) {
if (!\is_array($this->defaultContext[self::CALLBACKS])) {
throw new InvalidArgumentException(sprintf('The "%s" default context option must be an array of callables.', self::CALLBACKS));
}
foreach ($this->defaultContext[self::CALLBACKS] as $attribute => $callback) {
if (!\is_callable($callback)) {
throw new InvalidArgumentException(sprintf('Invalid callback found for attribute "%s" in the "%s" default context option.', $attribute, self::CALLBACKS));
}
}
}
if (isset($this->defaultContext[self::CIRCULAR_REFERENCE_HANDLER]) && !\is_callable($this->defaultContext[self::CIRCULAR_REFERENCE_HANDLER])) {
throw new InvalidArgumentException(sprintf('Invalid callback found in the "%s" default context option.', self::CIRCULAR_REFERENCE_HANDLER));
}
}
/**
* {@inheritdoc}
*/
public function hasCacheableSupportsMethod(): bool
{
return false;
}
/**
* Detects if the configured circular reference limit is reached.
*
* @return bool
*
* @throws CircularReferenceException
*/
protected function isCircularReference(object $object, array &$context)
{
$objectHash = spl_object_hash($object);
$circularReferenceLimit = $context[self::CIRCULAR_REFERENCE_LIMIT] ?? $this->defaultContext[self::CIRCULAR_REFERENCE_LIMIT];
if (isset($context[self::CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash])) {
if ($context[self::CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash] >= $circularReferenceLimit) {
unset($context[self::CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash]);
return true;
}
++$context[self::CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash];
} else {
$context[self::CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash] = 1;
}
return false;
}
/**
* Handles a circular reference.
*
* If a circular reference handler is set, it will be called. Otherwise, a
* {@class CircularReferenceException} will be thrown.
*
* @final
*
* @return mixed
*
* @throws CircularReferenceException
*/
protected function handleCircularReference(object $object, string $format = null, array $context = [])
{
$circularReferenceHandler = $context[self::CIRCULAR_REFERENCE_HANDLER] ?? $this->defaultContext[self::CIRCULAR_REFERENCE_HANDLER];
if ($circularReferenceHandler) {
return $circularReferenceHandler($object, $format, $context);
}
throw new CircularReferenceException(sprintf('A circular reference has been detected when serializing the object of class "%s" (configured limit: %d)', \get_class($object), $context[self::CIRCULAR_REFERENCE_LIMIT] ?? $this->defaultContext[self::CIRCULAR_REFERENCE_LIMIT]));
}
/**
* Gets attributes to normalize using groups.
*
* @param string|object $classOrObject
* @param bool $attributesAsString If false, return an array of {@link AttributeMetadataInterface}
*
* @throws LogicException if the 'allow_extra_attributes' context variable is false and no class metadata factory is provided
*
* @return string[]|AttributeMetadataInterface[]|bool
*/
protected function getAllowedAttributes($classOrObject, array $context, bool $attributesAsString = false)
{
$allowExtraAttributes = $context[self::ALLOW_EXTRA_ATTRIBUTES] ?? $this->defaultContext[self::ALLOW_EXTRA_ATTRIBUTES];
if (!$this->classMetadataFactory) {
if (!$allowExtraAttributes) {
throw new LogicException(sprintf('A class metadata factory must be provided in the constructor when setting "%s" to false.', self::ALLOW_EXTRA_ATTRIBUTES));
}
return false;
}
$tmpGroups = $context[self::GROUPS] ?? $this->defaultContext[self::GROUPS] ?? null;
$groups = (\is_array($tmpGroups) || is_scalar($tmpGroups)) ? (array) $tmpGroups : false;
if (false === $groups && $allowExtraAttributes) {
return false;
}
$allowedAttributes = [];
foreach ($this->classMetadataFactory->getMetadataFor($classOrObject)->getAttributesMetadata() as $attributeMetadata) {
$name = $attributeMetadata->getName();
if (
(false === $groups || array_intersect($attributeMetadata->getGroups(), $groups)) &&
$this->isAllowedAttribute($classOrObject, $name, null, $context)
) {
$allowedAttributes[] = $attributesAsString ? $name : $attributeMetadata;
}
}
return $allowedAttributes;
}
/**
* Is this attribute allowed?
*
* @param object|string $classOrObject
*
* @return bool
*/
protected function isAllowedAttribute($classOrObject, string $attribute, string $format = null, array $context = [])
{
$ignoredAttributes = $context[self::IGNORED_ATTRIBUTES] ?? $this->defaultContext[self::IGNORED_ATTRIBUTES];
if (\in_array($attribute, $ignoredAttributes)) {
return false;
}
$attributes = $context[self::ATTRIBUTES] ?? $this->defaultContext[self::ATTRIBUTES] ?? null;
if (isset($attributes[$attribute])) {
// Nested attributes
return true;
}
if (\is_array($attributes)) {
return \in_array($attribute, $attributes, true);
}
return true;
}
/**
* Normalizes the given data to an array. It's particularly useful during
* the denormalization process.
*
* @param object|array $data
*
* @return array
*/
protected function prepareForDenormalization($data)
{
return (array) $data;
}
/**
* Returns the method to use to construct an object. This method must be either
* the object constructor or static.
*
* @param array|bool $allowedAttributes
*
* @return \ReflectionMethod|null
*/
protected function getConstructor(array &$data, string $class, array &$context, \ReflectionClass $reflectionClass, $allowedAttributes)
{
return $reflectionClass->getConstructor();
}
/**
* Instantiates an object using constructor parameters when needed.
*
* This method also allows to denormalize data into an existing object if
* it is present in the context with the object_to_populate. This object
* is removed from the context before being returned to avoid side effects
* when recursively normalizing an object graph.
*
* @param array|bool $allowedAttributes
*
* @return object
*
* @throws RuntimeException
* @throws MissingConstructorArgumentsException
*/
protected function instantiateObject(array &$data, string $class, array &$context, \ReflectionClass $reflectionClass, $allowedAttributes, string $format = null)
{
if (null !== $object = $this->extractObjectToPopulate($class, $context, self::OBJECT_TO_POPULATE)) {
unset($context[self::OBJECT_TO_POPULATE]);
return $object;
}
// clean up even if no match
unset($context[static::OBJECT_TO_POPULATE]);
$constructor = $this->getConstructor($data, $class, $context, $reflectionClass, $allowedAttributes);
if ($constructor) {
if (true !== $constructor->isPublic()) {
return $reflectionClass->newInstanceWithoutConstructor();
}
$constructorParameters = $constructor->getParameters();
$params = [];
foreach ($constructorParameters as $constructorParameter) {
$paramName = $constructorParameter->name;
$key = $this->nameConverter ? $this->nameConverter->normalize($paramName, $class, $format, $context) : $paramName;
$allowed = false === $allowedAttributes || \in_array($paramName, $allowedAttributes);
$ignored = !$this->isAllowedAttribute($class, $paramName, $format, $context);
if ($constructorParameter->isVariadic()) {
if ($allowed && !$ignored && (isset($data[$key]) || \array_key_exists($key, $data))) {
if (!\is_array($data[$paramName])) {
throw new RuntimeException(sprintf('Cannot create an instance of %s from serialized data because the variadic parameter %s can only accept an array.', $class, $constructorParameter->name));
}
$variadicParameters = [];
foreach ($data[$paramName] as $parameterData) {
$variadicParameters[] = $this->denormalizeParameter($reflectionClass, $constructorParameter, $paramName, $parameterData, $context, $format);
}
$params = array_merge($params, $variadicParameters);
unset($data[$key]);
}
} elseif ($allowed && !$ignored && (isset($data[$key]) || \array_key_exists($key, $data))) {
$parameterData = $data[$key];
if (null === $parameterData && $constructorParameter->allowsNull()) {
$params[] = null;
// Don't run set for a parameter passed to the constructor
unset($data[$key]);
continue;
}
// Don't run set for a parameter passed to the constructor
$params[] = $this->denormalizeParameter($reflectionClass, $constructorParameter, $paramName, $parameterData, $context, $format);
unset($data[$key]);
} elseif (\array_key_exists($key, $context[static::DEFAULT_CONSTRUCTOR_ARGUMENTS][$class] ?? [])) {
$params[] = $context[static::DEFAULT_CONSTRUCTOR_ARGUMENTS][$class][$key];
} elseif (\array_key_exists($key, $this->defaultContext[self::DEFAULT_CONSTRUCTOR_ARGUMENTS][$class] ?? [])) {
$params[] = $this->defaultContext[self::DEFAULT_CONSTRUCTOR_ARGUMENTS][$class][$key];
} elseif ($constructorParameter->isDefaultValueAvailable()) {
$params[] = $constructorParameter->getDefaultValue();
} else {
throw new MissingConstructorArgumentsException(sprintf('Cannot create an instance of %s from serialized data because its constructor requires parameter "%s" to be present.', $class, $constructorParameter->name));
}
}
if ($constructor->isConstructor()) {
return $reflectionClass->newInstanceArgs($params);
} else {
return $constructor->invokeArgs(null, $params);
}
}
return new $class();
}
/**
* @internal
*/
protected function denormalizeParameter(\ReflectionClass $class, \ReflectionParameter $parameter, string $parameterName, $parameterData, array $context, string $format = null)
{
try {
if (null !== $parameter->getClass()) {
if (!$this->serializer instanceof DenormalizerInterface) {
throw new LogicException(sprintf('Cannot create an instance of %s from serialized data because the serializer inject in "%s" is not a denormalizer', $parameter->getClass(), self::class));
}
$parameterClass = $parameter->getClass()->getName();
$parameterData = $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $parameterName, $format));
}
} catch (\ReflectionException $e) {
throw new RuntimeException(sprintf('Could not determine the class of the parameter "%s".', $parameterName), 0, $e);
} catch (MissingConstructorArgumentsException $e) {
if (!$parameter->getType()->allowsNull()) {
throw $e;
}
$parameterData = null;
}
return $parameterData;
}
/**
* @internal
*/
protected function createChildContext(array $parentContext, string $attribute, ?string $format): array
{
if (isset($parentContext[self::ATTRIBUTES][$attribute])) {
$parentContext[self::ATTRIBUTES] = $parentContext[self::ATTRIBUTES][$attribute];
} else {
unset($parentContext[self::ATTRIBUTES]);
}
return $parentContext;
}
}
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