class FieldResolver in Drupal 8

Same name and namespace in other branches

9 core/modules/jsonapi/src/Context/FieldResolver.php \Drupal\jsonapi\Context\FieldResolver
10 core/modules/jsonapi/src/Context/FieldResolver.php \Drupal\jsonapi\Context\FieldResolver

A service that evaluates external path expressions against Drupal fields.

This class performs 3 essential functions, path resolution, path validation and path expansion.

Path resolution: Path resolution refers to the ability to map a set of external field names to their internal counterparts. This is necessary because a resource type can provide aliases for its field names. For example, the resource type


node--article

might "alias" the internal field name

uid;

to the external field name

author;

. This permits an API consumer to request


/jsonapi/node/article?include=author

for a better developer experience.

Path validation: Path validation refers to the ability to ensure that a requested path corresponds to a valid set of internal fields. For example, if an API consumer may send a

GET;

request to


/jsonapi/node/article?sort=author.field_first_name

. The field resolver ensures that

uid;

(which would have been resolved from

author;

) exists on article nodes and that

field_first_name;

exists on user entities. However, in the case of an

 include

path, the field resolver would raise a client error because

field_first_name;

is not an entity reference field, meaning it does not identify any related resources that can be included in a compound document.

Path expansion: Path expansion refers to the ability to expand a path to an entity query compatible field expression. For example, a request URL might have a query string like

 ?filter[field_tags.name]=aviation

, before constructing the appropriate entity query, the entity query system needs the path expression to be "expanded" into

field_tags . entity . name;

. In some rare cases, the entity query system needs this to be expanded to

 field_tags.entity:taxonomy_term.name

; the field resolver simply does this by default for every path.

*Note:* path expansion is *not* performed for

 include

paths.

@internal JSON:API maintains no PHP API. The API is the HTTP API. This class may change at any time and could break any dependencies on it.

Hierarchy

class \Drupal\jsonapi\Context\FieldResolver

Expanded class hierarchy of FieldResolver

File

core/modules/jsonapi/src/Context/FieldResolver.php, line 73

Namespace

Drupal\jsonapi\Context

View source

class FieldResolver {

  /**
   * The entity type manager.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * The field manager.
   *
   * @var \Drupal\Core\Entity\EntityFieldManagerInterface
   */
  protected $fieldManager;

  /**
   * The entity type bundle information service.
   *
   * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
   */
  protected $entityTypeBundleInfo;

  /**
   * The JSON:API resource type repository service.
   *
   * @var \Drupal\jsonapi\ResourceType\ResourceTypeRepositoryInterface
   */
  protected $resourceTypeRepository;

  /**
   * The module handler.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * Creates a FieldResolver instance.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   * @param \Drupal\Core\Entity\EntityFieldManagerInterface $field_manager
   *   The field manager.
   * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
   *   The bundle info service.
   * @param \Drupal\jsonapi\ResourceType\ResourceTypeRepositoryInterface $resource_type_repository
   *   The resource type repository.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityFieldManagerInterface $field_manager, EntityTypeBundleInfoInterface $entity_type_bundle_info, ResourceTypeRepositoryInterface $resource_type_repository, ModuleHandlerInterface $module_handler) {
    $this->entityTypeManager = $entity_type_manager;
    $this->fieldManager = $field_manager;
    $this->entityTypeBundleInfo = $entity_type_bundle_info;
    $this->resourceTypeRepository = $resource_type_repository;
    $this->moduleHandler = $module_handler;
  }

  /**
   * Validates and resolves an include path into its internal possibilities.
   *
   * Each resource type may define its own external names for its internal
   * field names. As a result, a single external include path may target
   * multiple internal paths.
   *
   * This can happen when an entity reference field has different allowed entity
   * types *per bundle* (as is possible with comment entities) or when
   * different resource types share an external field name but resolve to
   * different internal fields names.
   *
   * Example 1:
   * An installation may have three comment types for three different entity
   * types, two of which have a file field and one of which does not. In that
   * case, a path like @code field_comments.entity_id.media @endcode might be
   * resolved to both @code field_comments.entity_id.field_audio @endcode
   * and @code field_comments.entity_id.field_image @endcode.
   *
   * Example 2:
   * A path of @code field_author_profile.account @endcode might
   * resolve to @code field_author_profile.uid @endcode and @code
   * field_author_profile.field_user @endcode if @code
   * field_author_profile @endcode can relate to two different JSON:API resource
   * types (like `node--profile` and `node--migrated_profile`) which have the
   * external field name @code account @endcode aliased to different internal
   * field names.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType $resource_type
   *   The resource type for which the path should be validated.
   * @param string[] $path_parts
   *   The include path as an array of strings. For example, the include query
   *   parameter string of @code field_tags.uid @endcode should be given
   *   as @code ['field_tags', 'uid'] @endcode.
   * @param int $depth
   *   (internal) Used to track recursion depth in order to generate better
   *   exception messages.
   *
   * @return string[]
   *   The resolved internal include paths.
   *
   * @throws \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
   *   Thrown if the path contains invalid specifiers.
   */
  public static function resolveInternalIncludePath(ResourceType $resource_type, array $path_parts, $depth = 0) {
    $cacheability = (new CacheableMetadata())
      ->addCacheContexts([
      'url.query_args:include',
    ]);
    if (empty($path_parts[0])) {
      throw new CacheableBadRequestHttpException($cacheability, 'Empty include path.');
    }
    $public_field_name = $path_parts[0];
    $internal_field_name = $resource_type
      ->getInternalName($public_field_name);
    $relatable_resource_types = $resource_type
      ->getRelatableResourceTypesByField($public_field_name);
    if (empty($relatable_resource_types)) {
      $message = "`{$public_field_name}` is not a valid relationship field name.";
      if (!empty($possible = implode(', ', array_keys($resource_type
        ->getRelatableResourceTypes())))) {
        $message .= " Possible values: {$possible}.";
      }
      throw new CacheableBadRequestHttpException($cacheability, $message);
    }
    $remaining_parts = array_slice($path_parts, 1);
    if (empty($remaining_parts)) {
      return [
        [
          $internal_field_name,
        ],
      ];
    }
    $exceptions = [];
    $resolved = [];
    foreach ($relatable_resource_types as $relatable_resource_type) {
      try {

        // Each resource type may resolve the path differently and may return
        // multiple possible resolutions.
        $resolved = array_merge($resolved, static::resolveInternalIncludePath($relatable_resource_type, $remaining_parts, $depth + 1));
      } catch (CacheableBadRequestHttpException $e) {
        $exceptions[] = $e;
      }
    }
    if (!empty($exceptions) && count($exceptions) === count($relatable_resource_types)) {
      $previous_messages = implode(' ', array_unique(array_map(function (CacheableBadRequestHttpException $e) {
        return $e
          ->getMessage();
      }, $exceptions)));

      // Only add the full include path on the first level of recursion so that
      // the invalid path phrase isn't repeated at every level.
      throw new CacheableBadRequestHttpException($cacheability, $depth === 0 ? sprintf("`%s` is not a valid include path. {$previous_messages}", implode('.', $path_parts)) : $previous_messages);
    }

    // Remove duplicates by converting to strings and then using array_unique().
    $resolved_as_strings = array_map(function ($possibility) {
      return implode('.', $possibility);
    }, $resolved);
    $resolved_as_strings = array_unique($resolved_as_strings);

    // The resolved internal paths do not include the current field name because
    // resolution happens in a recursive process. Convert back from strings.
    return array_map(function ($possibility) use ($internal_field_name) {
      return array_merge([
        $internal_field_name,
      ], explode('.', $possibility));
    }, $resolved_as_strings);
  }

  /**
   * Resolves external field expressions into entity query compatible paths.
   *
   * It is often required to reference data which may exist across a
   * relationship. For example, you may want to sort a list of articles by
   * a field on the article author's representative entity. Or you may wish
   * to filter a list of content by the name of referenced taxonomy terms.
   *
   * In an effort to simplify the referenced paths and align them with the
   * structure of JSON:API responses and the structure of the hypothetical
   * "reference document" (see link), it is possible to alias field names and
   * elide the "entity" keyword from them (this word is used by the entity query
   * system to traverse entity references).
   *
   * This method takes this external field expression and attempts to resolve
   * any aliases and/or abbreviations into a field expression that will be
   * compatible with the entity query system.
   *
   * @link http://jsonapi.org/recommendations/#urls-reference-document
   *
   * Example:
   *   'uid.field_first_name' -> 'uid.entity.field_first_name'.
   *   'author.firstName' -> 'field_author.entity.field_first_name'
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType $resource_type
   *   The JSON:API resource type from which to resolve the field name.
   * @param string $external_field_name
   *   The public field name to map to a Drupal field name.
   * @param string $operator
   *   (optional) The operator of the condition for which the path should be
   *   resolved.
   *
   * @return string
   *   The mapped field name.
   *
   * @throws \Drupal\Core\Http\Exception\CacheableBadRequestHttpException
   */
  public function resolveInternalEntityQueryPath($resource_type, $external_field_name, $operator = NULL) {
    $function_args = func_get_args();

    // @todo Remove this conditional block in drupal:9.0.0 and add a type hint
    // to the first argument of this method.
    // @see https://www.drupal.org/project/drupal/issues/3078045
    if (count($function_args) === 3 && is_string($resource_type)) {
      @trigger_error('Passing the entity type ID and bundle to ' . __METHOD__ . ' is deprecated in drupal:8.8.0 and will throw a fatal error in drupal:9.0.0. Pass a JSON:API resource type instead. See https://www.drupal.org/node/3078036', E_USER_DEPRECATED);
      list($entity_type_id, $bundle, $external_field_name) = $function_args;
      $resource_type = $this->resourceTypeRepository
        ->get($entity_type_id, $bundle);
    }
    elseif (!$resource_type instanceof ResourceType) {
      throw new \InvalidArgumentException("The first argument to " . __METHOD__ . " should be an instance of \\Drupal\\jsonapi\\ResourceType\\ResourceType, " . gettype($resource_type) . " given.");
    }
    $cacheability = (new CacheableMetadata())
      ->addCacheContexts([
      'url.query_args:filter',
      'url.query_args:sort',
    ]);
    if (empty($external_field_name)) {
      throw new CacheableBadRequestHttpException($cacheability, 'No field name was provided for the filter.');
    }

    // Turns 'uid.categories.name' into
    // 'uid.entity.field_category.entity.name'. This may be too simple, but it
    // works for the time being.
    $parts = explode('.', $external_field_name);
    $unresolved_path_parts = $parts;
    $reference_breadcrumbs = [];

    /* @var \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types */
    $resource_types = [
      $resource_type,
    ];

    // This complex expression is needed to handle the string, "0", which would
    // otherwise be evaluated as FALSE.
    while (!is_null($part = array_shift($parts))) {
      if (!$this
        ->isMemberFilterable($part, $resource_types)) {
        throw new CacheableBadRequestHttpException($cacheability, sprintf('Invalid nested filtering. The field `%s`, given in the path `%s`, does not exist.', $part, $external_field_name));
      }
      $field_name = $this
        ->getInternalName($part, $resource_types);

      // If none of the resource types are traversable, assume that the
      // remaining path parts are targeting field deltas and/or field
      // properties.
      if (!$this
        ->resourceTypesAreTraversable($resource_types)) {
        $reference_breadcrumbs[] = $field_name;
        return $this
          ->constructInternalPath($reference_breadcrumbs, $parts);
      }

      // Different resource types have different field definitions.
      $candidate_definitions = $this
        ->getFieldItemDefinitions($resource_types, $field_name);
      assert(!empty($candidate_definitions));

      // We have a valid field, so add it to the validated trail of path parts.
      $reference_breadcrumbs[] = $field_name;

      // Remove resource types which do not have a candidate definition.
      $resource_types = array_filter($resource_types, function (ResourceType $resource_type) use ($candidate_definitions) {
        return isset($candidate_definitions[$resource_type
          ->getTypeName()]);
      });

      // Check access to execute a query for each field per resource type since
      // field definitions are bundle-specific.
      foreach ($resource_types as $resource_type) {
        $field_access = $this
          ->getFieldAccess($resource_type, $field_name);
        $cacheability
          ->addCacheableDependency($field_access);
        if (!$field_access
          ->isAllowed()) {
          $message = sprintf('The current user is not authorized to filter by the `%s` field, given in the path `%s`.', $field_name, implode('.', $reference_breadcrumbs));
          if ($field_access instanceof AccessResultReasonInterface && ($reason = $field_access
            ->getReason()) && !empty($reason)) {
            $message .= ' ' . $reason;
          }
          throw new CacheableAccessDeniedHttpException($cacheability, $message);
        }
      }

      // Get all of the referenceable resource types.
      $resource_types = $this
        ->getRelatableResourceTypes($resource_types, $candidate_definitions);
      $at_least_one_entity_reference_field = FALSE;
      $candidate_property_names = array_unique(NestedArray::mergeDeepArray(array_map(function (FieldItemDataDefinitionInterface $definition) use (&$at_least_one_entity_reference_field) {
        $property_definitions = $definition
          ->getPropertyDefinitions();
        return array_reduce(array_keys($property_definitions), function ($property_names, $property_name) use ($property_definitions, &$at_least_one_entity_reference_field) {
          $property_definition = $property_definitions[$property_name];
          $is_data_reference_definition = $property_definition instanceof DataReferenceTargetDefinition;
          if (!$property_definition
            ->isInternal()) {

            // Entity reference fields are special: their reference property
            // (usually `target_id`) is never exposed in the JSON:API
            // representation. Hence it must also not be exposed in 400
            // responses' error messages.
            $property_names[] = $is_data_reference_definition ? 'id' : $property_name;
          }
          if ($is_data_reference_definition) {
            $at_least_one_entity_reference_field = TRUE;
          }
          return $property_names;
        }, []);
      }, $candidate_definitions)));

      // Determine if the specified field has one property or many in its
      // JSON:API representation, or if it is an relationship (an entity
      // reference field), in which case the `id` of the related resource must
      // always be specified.
      $property_specifier_needed = $at_least_one_entity_reference_field || count($candidate_property_names) > 1;

      // If there are no remaining path parts, the process is finished unless
      // the field has multiple properties, in which case one must be specified.
      if (empty($parts)) {

        // If the operator is asserting the presence or absence of a
        // relationship entirely, it does not make sense to require a property
        // specifier.
        if ($property_specifier_needed && (!$at_least_one_entity_reference_field || !in_array($operator, [
          'IS NULL',
          'IS NOT NULL',
        ], TRUE))) {
          $possible_specifiers = array_map(function ($specifier) use ($at_least_one_entity_reference_field) {
            return $at_least_one_entity_reference_field && $specifier !== 'id' ? "meta.{$specifier}" : $specifier;
          }, $candidate_property_names);
          throw new CacheableBadRequestHttpException($cacheability, sprintf('Invalid nested filtering. The field `%s`, given in the path `%s` is incomplete, it must end with one of the following specifiers: `%s`.', $part, $external_field_name, implode('`, `', $possible_specifiers)));
        }
        return $this
          ->constructInternalPath($reference_breadcrumbs);
      }

      // If the next part is a delta, as in "body.0.value", then we add it to
      // the breadcrumbs and remove it from the parts that still must be
      // processed.
      if (static::isDelta($parts[0])) {
        $reference_breadcrumbs[] = array_shift($parts);
      }

      // If there are no remaining path parts, the process is finished.
      if (empty($parts)) {
        return $this
          ->constructInternalPath($reference_breadcrumbs);
      }

      // JSON:API outputs entity reference field properties under a meta object
      // on a relationship. If the filter specifies one of these properties, it
      // must prefix the property name with `meta`. The only exception is if the
      // next path part is the same as the name for the reference property
      // (typically `entity`), this is permitted to disambiguate the case of a
      // field name on the target entity which is the same a property name on
      // the entity reference field.
      if ($at_least_one_entity_reference_field && $parts[0] !== 'id') {
        if ($parts[0] === 'meta') {
          array_shift($parts);
        }
        elseif (in_array($parts[0], $candidate_property_names) && !static::isCandidateDefinitionReferenceProperty($parts[0], $candidate_definitions)) {
          throw new CacheableBadRequestHttpException($cacheability, sprintf('Invalid nested filtering. The property `%s`, given in the path `%s` belongs to the meta object of a relationship and must be preceded by `meta`.', $parts[0], $external_field_name));
        }
      }

      // Determine if the next part is not a property of $field_name.
      if (!static::isCandidateDefinitionProperty($parts[0], $candidate_definitions) && !empty(static::getAllDataReferencePropertyNames($candidate_definitions))) {

        // The next path part is neither a delta nor a field property, so it
        // must be a field on a targeted resource type. We need to guess the
        // intermediate reference property since one was not provided.
        //
        // For example, the path `uid.name` for a `node--article` resource type
        // will be resolved into `uid.entity.name`.
        $reference_breadcrumbs[] = static::getDataReferencePropertyName($candidate_definitions, $parts, $unresolved_path_parts);
      }
      else {

        // If the property is not a reference property, then all
        // remaining parts must be further property specifiers.
        if (!static::isCandidateDefinitionReferenceProperty($parts[0], $candidate_definitions)) {

          // If a field property is specified on a field with only one property
          // defined, throw an error because in the JSON:API output, it does not
          // exist. This is because JSON:API elides single-value properties;
          // respecting it would leak this Drupalism out.
          if (count($candidate_property_names) === 1) {
            throw new CacheableBadRequestHttpException($cacheability, sprintf('Invalid nested filtering. The property `%s`, given in the path `%s`, does not exist. Filter by `%s`, not `%s` (the JSON:API module elides property names from single-property fields).', $parts[0], $external_field_name, substr($external_field_name, 0, strlen($external_field_name) - strlen($parts[0]) - 1), $external_field_name));
          }
          elseif (!in_array($parts[0], $candidate_property_names, TRUE)) {
            throw new CacheableBadRequestHttpException($cacheability, sprintf('Invalid nested filtering. The property `%s`, given in the path `%s`, does not exist. Must be one of the following property names: `%s`.', $parts[0], $external_field_name, implode('`, `', $candidate_property_names)));
          }
          return $this
            ->constructInternalPath($reference_breadcrumbs, $parts);
        }

        // The property is a reference, so add it to the breadcrumbs and
        // continue resolving fields.
        $reference_breadcrumbs[] = array_shift($parts);
      }
    }

    // Reconstruct the full path to the final reference field.
    return $this
      ->constructInternalPath($reference_breadcrumbs);
  }

  /**
   * Expands the internal path with the "entity" keyword.
   *
   * @param string[] $references
   *   The resolved internal field names of all entity references.
   * @param string[] $property_path
   *   (optional) A sub-property path for the last field in the path.
   *
   * @return string
   *   The expanded and imploded path.
   */
  protected function constructInternalPath(array $references, array $property_path = []) {

    // Reconstruct the path parts that are referencing sub-properties.
    $field_path = implode('.', $property_path);

    // This rebuilds the path from the real, internal field names that have
    // been traversed so far. It joins them with the "entity" keyword as
    // required by the entity query system.
    $entity_path = implode('.', $references);

    // Reconstruct the full path to the final reference field.
    return empty($field_path) ? $entity_path : $entity_path . '.' . $field_path;
  }

  /**
   * Get all item definitions from a set of resources types by a field name.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types
   *   The resource types on which the field might exist.
   * @param string $field_name
   *   The field for which to retrieve field item definitions.
   *
   * @return \Drupal\Core\TypedData\ComplexDataDefinitionInterface[]
   *   The found field item definitions.
   */
  protected function getFieldItemDefinitions(array $resource_types, $field_name) {
    return array_reduce($resource_types, function ($result, ResourceType $resource_type) use ($field_name) {

      /* @var \Drupal\jsonapi\ResourceType\ResourceType $resource_type */
      $entity_type = $resource_type
        ->getEntityTypeId();
      $bundle = $resource_type
        ->getBundle();
      $definitions = $this->fieldManager
        ->getFieldDefinitions($entity_type, $bundle);
      if (isset($definitions[$field_name])) {
        $result[$resource_type
          ->getTypeName()] = $definitions[$field_name]
          ->getItemDefinition();
      }
      return $result;
    }, []);
  }

  /**
   * Resolves the UUID field name for a resource type.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType $resource_type
   *   The resource type for which to get the UUID field name.
   *
   * @return string
   *   The resolved internal name.
   */
  protected function getIdFieldName(ResourceType $resource_type) {
    $entity_type = $this->entityTypeManager
      ->getDefinition($resource_type
      ->getEntityTypeId());
    return $entity_type
      ->getKey('uuid');
  }

  /**
   * Resolves the internal field name based on a collection of resource types.
   *
   * @param string $field_name
   *   The external field name.
   * @param \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types
   *   The resource types from which to get an internal name.
   *
   * @return string
   *   The resolved internal name.
   */
  protected function getInternalName($field_name, array $resource_types) {
    return array_reduce($resource_types, function ($carry, ResourceType $resource_type) use ($field_name) {
      if ($carry != $field_name) {

        // We already found the internal name.
        return $carry;
      }
      return $field_name === 'id' ? $this
        ->getIdFieldName($resource_type) : $resource_type
        ->getInternalName($field_name);
    }, $field_name);
  }

  /**
   * Determines if the given field or member name is filterable.
   *
   * @param string $external_name
   *   The external field or member name.
   * @param \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types
   *   The resource types to test.
   *
   * @return bool
   *   Whether the given field is present as a filterable member of the targeted
   *   resource objects.
   */
  protected function isMemberFilterable($external_name, array $resource_types) {
    return array_reduce($resource_types, function ($carry, ResourceType $resource_type) use ($external_name) {

      // @todo: remove the next line and uncomment the following one in https://www.drupal.org/project/drupal/issues/3017047.
      return $carry ?: $external_name === 'id' || $resource_type
        ->isFieldEnabled($resource_type
        ->getInternalName($external_name));

      /*return $carry ?: in_array($external_name, ['id', 'type']) || $resource_type->isFieldEnabled($resource_type->getInternalName($external_name));*/
    }, FALSE);
  }

  /**
   * Get the referenceable ResourceTypes for a set of field definitions.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types
   *   The resource types on which the reference field might exist.
   * @param \Drupal\Core\Field\TypedData\FieldItemDataDefinitionInterface[] $definitions
   *   The field item definitions of targeted fields, keyed by the resource
   *   type name on which they reside.
   *
   * @return \Drupal\jsonapi\ResourceType\ResourceType[]
   *   The referenceable target resource types.
   */
  protected function getRelatableResourceTypes(array $resource_types, array $definitions) {
    $relatable_resource_types = [];
    foreach ($resource_types as $resource_type) {
      $definition = $definitions[$resource_type
        ->getTypeName()];
      $resource_type_field = $resource_type
        ->getFieldByInternalName($definition
        ->getFieldDefinition()
        ->getName());
      if ($resource_type_field instanceof ResourceTypeRelationship) {
        foreach ($resource_type_field
          ->getRelatableResourceTypes() as $relatable_resource_type) {
          $relatable_resource_types[$relatable_resource_type
            ->getTypeName()] = $relatable_resource_type;
        }
      }
    }
    return $relatable_resource_types;
  }

  /**
   * Whether the given resources can be traversed to other resources.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType[] $resource_types
   *   The resources types to evaluate.
   *
   * @return bool
   *   TRUE if any one of the given resource types is traversable.
   *
   * @todo This class shouldn't be aware of entity types and their definitions.
   * Whether a resource can have relationships to other resources is information
   * we ought to be able to discover on the ResourceType. However, we cannot
   * reliably determine this information with existing APIs. Entities may be
   * backed by various storages that are unable to perform queries across
   * references and certain storages may not be able to store references at all.
   */
  protected function resourceTypesAreTraversable(array $resource_types) {
    foreach ($resource_types as $resource_type) {
      $entity_type_definition = $this->entityTypeManager
        ->getDefinition($resource_type
        ->getEntityTypeId());
      if ($entity_type_definition
        ->entityClassImplements(FieldableEntityInterface::class)) {
        return TRUE;
      }
    }
    return FALSE;
  }

  /**
   * Gets all unique reference property names from the given field definitions.
   *
   * @param \Drupal\Core\TypedData\ComplexDataDefinitionInterface[] $candidate_definitions
   *   A list of targeted field item definitions specified by the path.
   *
   * @return string[]
   *   The reference property names, if any.
   */
  protected static function getAllDataReferencePropertyNames(array $candidate_definitions) {
    $reference_property_names = array_reduce($candidate_definitions, function (array $reference_property_names, ComplexDataDefinitionInterface $definition) {
      $property_definitions = $definition
        ->getPropertyDefinitions();
      foreach ($property_definitions as $property_name => $property_definition) {
        if ($property_definition instanceof DataReferenceDefinitionInterface) {
          $target_definition = $property_definition
            ->getTargetDefinition();
          assert($target_definition instanceof EntityDataDefinitionInterface, 'Entity reference fields should only be able to reference entities.');
          $reference_property_names[] = $property_name . ':' . $target_definition
            ->getEntityTypeId();
        }
      }
      return $reference_property_names;
    }, []);
    return array_unique($reference_property_names);
  }

  /**
   * Determines the reference property name for the remaining unresolved parts.
   *
   * @param \Drupal\Core\TypedData\ComplexDataDefinitionInterface[] $candidate_definitions
   *   A list of targeted field item definitions specified by the path.
   * @param string[] $remaining_parts
   *   The remaining path parts.
   * @param string[] $unresolved_path_parts
   *   The unresolved path parts.
   *
   * @return string
   *   The reference name.
   */
  protected static function getDataReferencePropertyName(array $candidate_definitions, array $remaining_parts, array $unresolved_path_parts) {
    $unique_reference_names = static::getAllDataReferencePropertyNames($candidate_definitions);
    if (count($unique_reference_names) > 1) {
      $choices = array_map(function ($reference_name) use ($unresolved_path_parts, $remaining_parts) {
        $prior_parts = array_slice($unresolved_path_parts, 0, count($unresolved_path_parts) - count($remaining_parts));
        return implode('.', array_merge($prior_parts, [
          $reference_name,
        ], $remaining_parts));
      }, $unique_reference_names);

      // @todo Add test coverage for this in https://www.drupal.org/project/drupal/issues/2971281
      $message = sprintf('Ambiguous path. Try one of the following: %s, in place of the given path: %s', implode(', ', $choices), implode('.', $unresolved_path_parts));
      $cacheability = (new CacheableMetadata())
        ->addCacheContexts([
        'url.query_args:filter',
        'url.query_args:sort',
      ]);
      throw new CacheableBadRequestHttpException($cacheability, $message);
    }
    return $unique_reference_names[0];
  }

  /**
   * Determines if a path part targets a specific field delta.
   *
   * @param string $part
   *   The path part.
   *
   * @return bool
   *   TRUE if the part is an integer, FALSE otherwise.
   */
  protected static function isDelta($part) {
    return (bool) preg_match('/^[0-9]+$/', $part);
  }

  /**
   * Determines if a path part targets a field property, not a subsequent field.
   *
   * @param string $part
   *   The path part.
   * @param \Drupal\Core\TypedData\ComplexDataDefinitionInterface[] $candidate_definitions
   *   A list of targeted field item definitions which are specified by the
   *   path.
   *
   * @return bool
   *   TRUE if the part is a property of one of the candidate definitions, FALSE
   *   otherwise.
   */
  protected static function isCandidateDefinitionProperty($part, array $candidate_definitions) {
    $part = static::getPathPartPropertyName($part);
    foreach ($candidate_definitions as $definition) {
      if ($definition
        ->getPropertyDefinition($part)) {
        return TRUE;
      }
    }
    return FALSE;
  }

  /**
   * Determines if a path part targets a reference property.
   *
   * @param string $part
   *   The path part.
   * @param \Drupal\Core\TypedData\ComplexDataDefinitionInterface[] $candidate_definitions
   *   A list of targeted field item definitions which are specified by the
   *   path.
   *
   * @return bool
   *   TRUE if the part is a property of one of the candidate definitions, FALSE
   *   otherwise.
   */
  protected static function isCandidateDefinitionReferenceProperty($part, array $candidate_definitions) {
    $part = static::getPathPartPropertyName($part);
    foreach ($candidate_definitions as $definition) {
      $property = $definition
        ->getPropertyDefinition($part);
      if ($property && $property instanceof DataReferenceDefinitionInterface) {
        return TRUE;
      }
    }
    return FALSE;
  }

  /**
   * Gets the property name from an entity typed or untyped path part.
   *
   * A path part may contain an entity type specifier like `entity:node`. This
   * extracts the actual property name. If an entity type is not specified, then
   * the path part is simply returned. For example, both `foo` and `foo:bar`
   * will return `foo`.
   *
   * @param string $part
   *   A path part.
   *
   * @return string
   *   The property name from a path part.
   */
  protected static function getPathPartPropertyName($part) {
    return strpos($part, ':') !== FALSE ? explode(':', $part)[0] : $part;
  }

  /**
   * Gets the field access result for the 'view' operation.
   *
   * @param \Drupal\jsonapi\ResourceType\ResourceType $resource_type
   *   The JSON:API resource type on which the field exists.
   * @param string $internal_field_name
   *   The field name for which access should be checked.
   *
   * @return \Drupal\Core\Access\AccessResultInterface
   *   The 'view' access result.
   */
  protected function getFieldAccess(ResourceType $resource_type, $internal_field_name) {
    $definitions = $this->fieldManager
      ->getFieldDefinitions($resource_type
      ->getEntityTypeId(), $resource_type
      ->getBundle());
    assert(isset($definitions[$internal_field_name]), 'The field name should have already been validated.');
    $field_definition = $definitions[$internal_field_name];
    $filter_access_results = $this->moduleHandler
      ->invokeAll('jsonapi_entity_field_filter_access', [
      $field_definition,
      \Drupal::currentUser(),
    ]);
    $filter_access_result = array_reduce($filter_access_results, function (AccessResultInterface $combined_result, AccessResultInterface $result) {
      return $combined_result
        ->orIf($result);
    }, AccessResult::neutral());
    if (!$filter_access_result
      ->isNeutral()) {
      return $filter_access_result;
    }
    $entity_access_control_handler = $this->entityTypeManager
      ->getAccessControlHandler($resource_type
      ->getEntityTypeId());
    $field_access = $entity_access_control_handler
      ->fieldAccess('view', $field_definition, NULL, NULL, TRUE);
    return $filter_access_result
      ->orIf($field_access);
  }

}

Members

Name	Modifiers	Type	Description
FieldResolver::$entityTypeBundleInfo	protected	property	The entity type bundle information service.
FieldResolver::$entityTypeManager	protected	property	The entity type manager.
FieldResolver::$fieldManager	protected	property	The field manager.
FieldResolver::$moduleHandler	protected	property	The module handler.
FieldResolver::$resourceTypeRepository	protected	property	The JSON:API resource type repository service.
FieldResolver::constructInternalPath	protected	function	Expands the internal path with the "entity" keyword.
FieldResolver::getAllDataReferencePropertyNames	protected static	function	Gets all unique reference property names from the given field definitions.
FieldResolver::getDataReferencePropertyName	protected static	function	Determines the reference property name for the remaining unresolved parts.
FieldResolver::getFieldAccess	protected	function	Gets the field access result for the 'view' operation.
FieldResolver::getFieldItemDefinitions	protected	function	Get all item definitions from a set of resources types by a field name.
FieldResolver::getIdFieldName	protected	function	Resolves the UUID field name for a resource type.
FieldResolver::getInternalName	protected	function	Resolves the internal field name based on a collection of resource types.
FieldResolver::getPathPartPropertyName	protected static	function	Gets the property name from an entity typed or untyped path part.
FieldResolver::getRelatableResourceTypes	protected	function	Get the referenceable ResourceTypes for a set of field definitions.
FieldResolver::isCandidateDefinitionProperty	protected static	function	Determines if a path part targets a field property, not a subsequent field.
FieldResolver::isCandidateDefinitionReferenceProperty	protected static	function	Determines if a path part targets a reference property.
FieldResolver::isDelta	protected static	function	Determines if a path part targets a specific field delta.
FieldResolver::isMemberFilterable	protected	function	Determines if the given field or member name is filterable.
FieldResolver::resolveInternalEntityQueryPath	public	function	Resolves external field expressions into entity query compatible paths.
FieldResolver::resolveInternalIncludePath	public static	function	Validates and resolves an include path into its internal possibilities.
FieldResolver::resourceTypesAreTraversable	protected	function	Whether the given resources can be traversed to other resources.
FieldResolver::__construct	public	function	Creates a FieldResolver instance.

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class FieldResolver in Drupal 8

Hierarchy

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Members

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