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*/ public static function get_field_definition(): array { return array( 'type' => Type::nonNull( Type::listOf( Type::nonNull( self::get_target_type() ) ) ), 'description' => __( 'Lists metadata attached to elements of this schema. All filter arguments are optional; supplying multiple narrows the result. Use this to discover internal-use APIs, beta features, ownership, etc., or to ask "can I use this specific element?".', 'woocommerce' ), 'args' => array( 'name' => array( 'type' => Type::string(), 'description' => __( 'Match rows that carry a metadata entry with this name. Surviving rows have their entries trimmed to the matching one.', 'woocommerce' ), ), 'type' => array( 'type' => Type::string(), 'description' => __( 'Match rows whose target type equals this name.', 'woocommerce' ), ), 'field' => array( 'type' => Type::string(), 'description' => __( 'Match rows whose target field equals this name.', 'woocommerce' ), ), 'attribute' => array( 'type' => Type::string(), 'description' => __( 'Match rows whose authorization carries an attribute with this class short name. Surviving rows have their authorization trimmed to the matching descriptors.', 'woocommerce' ), ), ), 'resolve' => array( self::class, 'resolve' ), ); } /** * Resolver for the `_apiMetadata` root field. Signature matches the * engine's resolver contract; `$root` is unused here (root operations * have no parent). `$context` is read for the principal so the * `can_query_metadata` ladder can run. * * @param ?array $root The engine passes null for root resolvers. * @param array $args GraphQL arguments (`name`, `type`, `field`, `attribute`). * @param mixed $context Per-request context — an ArrayObject wrapping {`principal`, `_query_metadata`}. * @param ResolveInfo $info Carries the schema instance to walk. * @return list> * @throws Error When the principal is not allowed to query `_apiMetadata`. */ public static function resolve( ?array $root, array $args, mixed $context, ResolveInfo $info ): array { unset( $root ); $principal = is_object( $context ) || is_array( $context ) ? ( $context['principal'] ?? null ) : null; if ( ! self::can_query_metadata( $principal ) ) { // phpcs:ignore WordPress.Security.EscapeOutput.ExceptionNotEscaped -- Static error message + machine code; serialized as JSON, not HTML. throw self::build_metadata_query_authorization_error( $principal ); } // Wrap the resolver's engine-typed schema into the same handle clients // receive from `GraphQLControllerBase::get_schema()`, so the resolver and // PHP-side callers share a single inspection surface. $schema = new SchemaHandle( $info->schema ); $rows = $schema->find_metadata( $args['name'] ?? null, $args['type'] ?? null, $args['field'] ?? null, $args['attribute'] ?? null, ); // SchemaHandle returns entries as an associative `name => value` map, // which is the natural shape for filtering and PHP-side consumers. The // GraphQL `MetadataEntry` type instead exposes each entry as a // `{ name, value }` object so clients can `entries { name value }` over // a list. Reshape here. return array_map( static function ( array $row ): array { $row['entries'] = array_map( static fn( string $entry_name, $entry_value ): array => array( 'name' => $entry_name, 'value' => $entry_value, ), array_keys( $row['entries'] ), array_values( $row['entries'] ), ); return $row; }, $rows ); } /** * Whether the principal may run the `_apiMetadata` query. * * Tri-tier ladder, deliberately fail-closed: * * 1. If the principal declares `can_query_metadata(): bool`, use it. * Plugins distinguish metadata-query access from native * introspection access by declaring this method. * 2. Else if the principal declares `can_introspect(): bool`, fall * back to it — one switch then gates both metadata and * introspection, which is the common case. * 3. Else (neither method declared) deny. Plugin authors that don't * opt their principal in get a locked-down endpoint rather than * leaking schema shape and gate descriptors by default. * * The principal-derived decision is then passed through the * {@see 'woocommerce_graphql_can_query_metadata'} filter so sites * can grant or revoke access without subclassing the principal — * useful for per-request rules (specific IPs, headers, query * parameters, etc.). * * Fail-closed contract: null principal denies before the filter is * consulted; either method's return is checked with `=== true`; any * throw from the principal method or the filter denies; the filter * must likewise return strictly `true` to allow. * * @param ?object $principal The resolved principal, or null when principal resolution failed. */ private static function can_query_metadata( ?object $principal ): bool { if ( null === $principal ) { return false; } try { if ( method_exists( $principal, 'can_query_metadata' ) ) { $allowed = true === $principal->can_query_metadata(); } elseif ( method_exists( $principal, 'can_introspect' ) ) { $allowed = true === $principal->can_introspect(); } else { $allowed = false; } /** * Filters whether the current principal may run the `_apiMetadata` query. * * The filter receives the principal-derived decision (see the tri-tier * ladder in {@see MetadataController::can_query_metadata()}) and must * return strictly `true` to grant access; any other return value * denies. The filter is not invoked when principal resolution failed * (i.e. when the resolver receives a null principal) — that case * denies outright. * * @since 10.9.0 * * @internal * * @param bool $allowed Whether the principal may query `_apiMetadata`. * @param object $principal The resolved principal. */ $allowed = apply_filters( 'woocommerce_graphql_can_query_metadata', $allowed, $principal ); } catch ( \Throwable $e ) { return false; } return true === $allowed; } /** * Build the GraphQL error thrown when `_apiMetadata` is queried by a * principal that cannot. Mirrors * {@see ResolverHelpers::build_authorization_error()}'s * UNAUTHORIZED / FORBIDDEN distinction so clients can branch on * `extensions.code` the same way they do for field-level denies. * * @param ?object $principal The resolved principal (null when principal resolution failed). */ private static function build_metadata_query_authorization_error( ?object $principal ): Error { $is_anonymous = null === $principal || ( method_exists( $principal, 'is_authenticated' ) && ! $principal->is_authenticated() ); return new Error( $is_anonymous ? 'Authentication required.' : 'You do not have permission to perform this action.', extensions: array( 'code' => $is_anonymous ? 'UNAUTHORIZED' : 'FORBIDDEN' ) ); } /** * The `MetadataTarget` output type, lazily built and cached. */ private static function get_target_type(): ObjectType { if ( null === self::$target_type ) { self::$target_type = new ObjectType( array( 'name' => 'MetadataTarget', 'description' => __( 'One element of the schema with its attached metadata. Type-level rows have `field`, `argument` and `enumValue` set to null; field-level rows set `field` (and `argument` when the target is a field argument); enum-value rows set `enumValue`.', 'woocommerce' ), 'fields' => fn() => array( 'type' => array( 'type' => Type::nonNull( Type::string() ), 'description' => __( 'Name of the GraphQL type this row describes.', 'woocommerce' ), ), 'field' => array( 'type' => Type::string(), 'description' => __( 'Field name when this row describes a field (or a field argument); null for type-level rows.', 'woocommerce' ), ), 'argument' => array( 'type' => Type::string(), 'description' => __( 'Argument name when this row describes a field argument; null otherwise.', 'woocommerce' ), ), 'enumValue' => array( 'type' => Type::string(), 'description' => __( 'Enum value name when this row describes one specific enum value; null otherwise.', 'woocommerce' ), ), 'entries' => array( 'type' => Type::nonNull( Type::listOf( Type::nonNull( self::get_entry_type() ) ) ), 'description' => __( 'Metadata entries attached to the target.', 'woocommerce' ), ), 'authorization' => array( 'type' => Type::nonNull( Type::listOf( Type::nonNull( self::get_auth_entry_type() ) ) ), 'description' => __( 'Authorization attributes attached to the target (e.g. `RequiredCapability`, `PublicAccess`, or plugin-defined). Empty when the target carries no authorization attributes.', 'woocommerce' ), ), ), ) ); } return self::$target_type; } /** * The `AuthEntry` output type — one authorization attribute attached * to a target. Carries the attribute's short class name and the * scalar args supplied at the usage site. */ private static function get_auth_entry_type(): ObjectType { if ( null === self::$auth_entry_type ) { self::$auth_entry_type = new ObjectType( array( 'name' => 'AuthEntry', 'description' => __( 'One authorization attribute attached to a schema target.', 'woocommerce' ), 'fields' => fn() => array( 'attribute' => array( 'type' => Type::nonNull( Type::string() ), 'description' => __( 'Short class name of the authorization attribute (e.g. `RequiredCapability`).', 'woocommerce' ), ), 'args' => array( 'type' => Type::nonNull( Type::listOf( self::get_value_scalar() ) ), 'description' => __( 'Constructor arguments supplied at the usage site, in source order. Element type is the same scalar union as `MetadataValue`.', 'woocommerce' ), ), ), ) ); } return self::$auth_entry_type; } /** * The `MetadataEntry` output type, lazily built and cached. */ private static function get_entry_type(): ObjectType { if ( null === self::$entry_type ) { self::$entry_type = new ObjectType( array( 'name' => 'MetadataEntry', 'description' => __( 'One metadata entry: a `name` plus a scalar `value`.', 'woocommerce' ), 'fields' => fn() => array( 'name' => array( 'type' => Type::nonNull( Type::string() ), 'description' => __( 'Identifier of the entry (e.g. `internal`, `beta`).', 'woocommerce' ), ), 'value' => array( // Nullable: `MetadataValue` itself permits a null payload (e.g. // `#[Metadata( 'deprecated_reason', null )]`), so the wrapping // must allow it through. 'type' => self::get_value_scalar(), 'description' => __( 'Scalar payload associated with the entry. Null when the metadata entry carries a null value.', 'woocommerce' ), ), ), ) ); } return self::$entry_type; } /** * The `MetadataValue` custom scalar, accepting any GraphQL-compatible scalar. * * The autogenerated scalar template hard-codes acceptance of string * literals only, so this scalar is hand-built rather than going through * ApiBuilder. `parseLiteral` walks the AST node types and `parseValue` * accepts the already-decoded PHP scalar that variables-mode delivers. */ private static function get_value_scalar(): CustomScalarType { if ( null === self::$value_scalar ) { self::$value_scalar = new CustomScalarType( array( 'name' => 'MetadataValue', 'description' => __( 'Scalar payload of a metadata entry. Accepts a string, integer, float, boolean, or null.', 'woocommerce' ), // Resolvers return the raw PHP scalar; webonyx serialises it as JSON directly. 'serialize' => static fn( $value ) => $value, 'parseValue' => static function ( $value ) { if ( null === $value || is_bool( $value ) || is_int( $value ) || is_float( $value ) || is_string( $value ) ) { return $value; } throw new Error( 'MetadataValue must be a string, integer, float, boolean, or null.' ); }, 'parseLiteral' => static function ( $value_node, ?array $variables = null ) { unset( $variables ); if ( $value_node instanceof StringValueNode ) { return $value_node->value; } if ( $value_node instanceof BooleanValueNode ) { return $value_node->value; } if ( $value_node instanceof IntValueNode ) { return (int) $value_node->value; } if ( $value_node instanceof FloatValueNode ) { return (float) $value_node->value; } if ( $value_node instanceof NullValueNode ) { return null; } throw new Error( 'MetadataValue must be a string, integer, float, boolean, or null literal.' ); }, ) ); } return self::$value_scalar; } }