atibility for schemas that use invalid types.
 *
 * @since 5.5.0
 *
 * @param mixed  $value The value to check.
 * @param array  $args  The schema array to use.
 * @param string $param The parameter name, used in error messages.
 * @return string
 */
function rest_handle_multi_type_schema( $value, $args, $param = '' ) {
	$allowed_types = array( 'array', 'object', 'string', 'number', 'integer', 'boolean', 'null' );
	$invalid_types = array_diff( $args['type'], $allowed_types );

	if ( $invalid_types ) {
		_doing_it_wrong(
			__FUNCTION__,
			/* translators: 1. Parameter. 2. List of allowed types. */
			wp_sprintf( __( 'The "type" schema keyword for %1$s can only contain the built-in types: %2$l.' ), $param, $allowed_types ),
			'5.5.0'
		);
	}

	$best_type = rest_get_best_type_for_value( $value, $args['type'] );

	if ( ! $best_type ) {
		if ( ! $invalid_types ) {
			return '';
		}

		// Backward compatibility for previous behavior which allowed the value if there was an invalid type used.
		$best_type = reset( $invalid_types );
	}

	return $best_type;
}

/**
 * Checks if an array is made up of unique items.
 *
 * @since 5.5.0
 *
 * @param array $array The array to check.
 * @return bool True if the array contains unique items, false otherwise.
 */
function rest_validate_array_contains_unique_items( $array ) {
	$seen = array();

	foreach ( $array as $item ) {
		$stabilized = rest_stabilize_value( $item );
		$key        = serialize( $stabilized );

		if ( ! isset( $seen[ $key ] ) ) {
			$seen[ $key ] = true;

			continue;
		}

		return false;
	}

	return true;
}

/**
 * Stabilizes a value following JSON Schema semantics.
 *
 * For lists, order is preserved. For objects, properties are reordered alphabetically.
 *
 * @since 5.5.0
 *
 * @param mixed $value The value to stabilize. Must already be sanitized. Objects should have been converted to arrays.
 * @return mixed The stabilized value.
 */
function rest_stabilize_value( $value ) {
	if ( is_scalar( $value ) || is_null( $value ) ) {
		return $value;
	}

	if ( is_object( $value ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Cannot stabilize objects. Convert the object to an array first.' ), '5.5.0' );

		return $value;
	}

	ksort( $value );

	foreach ( $value as $k => $v ) {
		$value[ $k ] = rest_stabilize_value( $v );
	}

	return $value;
}

/**
 * Validate a value based on a schema.
 *
 * @since 4.7.0
 * @since 4.9.0 Support the "object" type.
 * @since 5.2.0 Support validating "additionalProperties" against a schema.
 * @since 5.3.0 Support multiple types.
 * @since 5.4.0 Convert an empty string to an empty object.
 * @since 5.5.0 Add the "uuid" and "hex-color" formats.
 *              Support the "minLength", "maxLength" and "pattern" keywords for strings.
 *              Support the "minItems", "maxItems" and "uniqueItems" keywords for arrays.
 *              Validate required properties.
 *
 * @param mixed  $value The value to validate.
 * @param array  $args  Schema array to use for validation.
 * @param string $param The parameter name, used in error messages.
 * @return true|WP_Error
 */
function rest_validate_value_from_schema( $value, $args, $param = '' ) {
	$allowed_types = array( 'array', 'object', 'string', 'number', 'integer', 'boolean', 'null' );

	if ( ! isset( $args['type'] ) ) {
		/* translators: 1. Parameter */
		_doing_it_wrong( __FUNCTION__, sprintf( __( 'The "type" schema keyword for %s is required.' ), $param ), '5.5.0' );
	}

	if ( is_array( $args['type'] ) ) {
		$best_type = rest_handle_multi_type_schema( $value, $args, $param );

		if ( ! $best_type ) {
			/* translators: 1: Parameter, 2: List of types. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, implode( ',', $args['type'] ) ) );
		}

		$args['type'] = $best_type;
	}

	if ( ! in_array( $args['type'], $allowed_types, true ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			/* translators: 1. Parameter 2. The list of allowed types. */
			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be one of the built-in types: %2$l.' ), $param, $allowed_types ),
			'5.5.0'
		);
	}

	if ( 'array' === $args['type'] ) {
		if ( ! rest_is_array( $value ) ) {
			/* translators: 1: Parameter, 2: Type name. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'array' ) );
		}

		$value = rest_sanitize_array( $value );

		if ( isset( $args['items'] ) ) {
			foreach ( $value as $index => $v ) {
				$is_valid = rest_validate_value_from_schema( $v, $args['items'], $param . '[' . $index . ']' );
				if ( is_wp_error( $is_valid ) ) {
					return $is_valid;
				}
			}
		}

		if ( isset( $args['minItems'] ) && count( $value ) < $args['minItems'] ) {
			/* translators: 1: Parameter, 2: Number. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must contain at least %2$s items.' ), $param, number_format_i18n( $args['minItems'] ) ) );
		}

		if ( isset( $args['maxItems'] ) && count( $value ) > $args['maxItems'] ) {
			/* translators: 1: Parameter, 2: Number. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must contain at most %2$s items.' ), $param, number_format_i18n( $args['maxItems'] ) ) );
		}

		if ( ! empty( $args['uniqueItems'] ) && ! rest_validate_array_contains_unique_items( $value ) ) {
			/* translators: 1: Parameter */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s has duplicate items.' ), $param ) );
		}
	}

	if ( 'object' === $args['type'] ) {
		if ( ! rest_is_object( $value ) ) {
			/* translators: 1: Parameter, 2: Type name. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'object' ) );
		}

		$value = rest_sanitize_object( $value );

		if ( isset( $args['required'] ) && is_array( $args['required'] ) ) { // schema version 4
			foreach ( $args['required'] as $name ) {
				if ( ! array_key_exists( $name, $value ) ) {
					/* translators: 1: Property of an object, 2: Parameter. */
					return new WP_Error( 'rest_property_required', sprintf( __( '%1$s is a required property of %2$s.' ), $name, $param ) );
				}
			}
		} elseif ( isset( $args['properties'] ) ) { // schema version 3
			foreach ( $args['properties'] as $name => $property ) {
				if ( isset( $property['required'] ) && true === $property['required'] && ! array_key_exists( $name, $value ) ) {
					/* translators: 1: Property of an object, 2: Parameter. */
					return new WP_Error( 'rest_property_required', sprintf( __( '%1$s is a required property of %2$s.' ), $name, $param ) );
				}
			}
		}

		foreach ( $value as $property => $v ) {
			if ( isset( $args['properties'][ $property ] ) ) {
				$is_valid = rest_validate_value_from_schema( $v, $args['properties'][ $property ], $param . '[' . $property . ']' );
				if ( is_wp_error( $is_valid ) ) {
					return $is_valid;
				}
			} elseif ( isset( $args['additionalProperties'] ) ) {
				if ( false === $args['additionalProperties'] ) {
					/* translators: %s: Property of an object. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not a valid property of Object.' ), $property ) );
				}

				if ( is_array( $args['additionalProperties'] ) ) {
					$is_valid = rest_validate_value_from_schema( $v, $args['additionalProperties'], $param . '[' . $property . ']' );
					if ( is_wp_error( $is_valid ) ) {
						return $is_valid;
					}
				}
			}
		}
	}

	if ( 'null' === $args['type'] ) {
		if ( null !== $value ) {
			/* translators: 1: Parameter, 2: Type name. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'null' ) );
		}

		return true;
	}

	if ( ! empty( $args['enum'] ) ) {
		if ( ! in_array( $value, $args['enum'], true ) ) {
			/* translators: 1: Parameter, 2: List of valid values. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not one of %2$s.' ), $param, implode( ', ', $args['enum'] ) ) );
		}
	}

	if ( in_array( $args['type'], array( 'integer', 'number' ), true ) && ! is_numeric( $value ) ) {
		/* translators: 1: Parameter, 2: Type name. */
		return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, $args['type'] ) );
	}

	if ( 'integer' === $args['type'] && ! rest_is_integer( $value ) ) {
		/* translators: 1: Parameter, 2: Type name. */
		return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'integer' ) );
	}

	if ( 'boolean' === $args['type'] && ! rest_is_boolean( $value ) ) {
		/* translators: 1: Parameter, 2: Type name. */
		return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'boolean' ) );
	}

	if ( 'string' === $args['type'] ) {
		if ( ! is_string( $value ) ) {
			/* translators: 1: Parameter, 2: Type name. */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not of type %2$s.' ), $param, 'string' ) );
		}

		if ( isset( $args['minLength'] ) && mb_strlen( $value ) < $args['minLength'] ) {
			return new WP_Error(
				'rest_invalid_param',
				sprintf(
					/* translators: 1: Parameter, 2: Number of characters. */
					_n( '%1$s must be at least %2$s character long.', '%1$s must be at least %2$s characters long.', $args['minLength'] ),
					$param,
					number_format_i18n( $args['minLength'] )
				)
			);
		}

		if ( isset( $args['maxLength'] ) && mb_strlen( $value ) > $args['maxLength'] ) {
			return new WP_Error(
				'rest_invalid_param',
				sprintf(
					/* translators: 1: Parameter, 2: Number of characters. */
					_n( '%1$s must be at most %2$s character long.', '%1$s must be at most %2$s characters long.', $args['maxLength'] ),
					$param,
					number_format_i18n( $args['maxLength'] )
				)
			);
		}

		if ( isset( $args['pattern'] ) ) {
			$pattern = str_replace( '#', '\\#', $args['pattern'] );
			if ( ! preg_match( '#' . $pattern . '#u', $value ) ) {
				/* translators: 1: Parameter, 2: Pattern. */
				return new WP_Error( 'rest_invalid_pattern', sprintf( __( '%1$s does not match pattern %2$s.' ), $param, $args['pattern'] ) );
			}
		}
	}

	// The "format" keyword should only be applied to strings. However, for backward compatibility,
	// we allow the "format" keyword if the type keyword was not specified, or was set to an invalid value.
	if ( isset( $args['format'] )
		&& ( ! isset( $args['type'] ) || 'string' === $args['type'] || ! in_array( $args['type'], $allowed_types, true ) )
	) {
		switch ( $args['format'] ) {
			case 'hex-color':
				if ( ! rest_parse_hex_color( $value ) ) {
					return new WP_Error( 'rest_invalid_hex_color', __( 'Invalid hex color.' ) );
				}
				break;

			case 'date-time':
				if ( ! rest_parse_date( $value ) ) {
					return new WP_Error( 'rest_invalid_date', __( 'Invalid date.' ) );
				}
				break;

			case 'email':
				if ( ! is_email( $value ) ) {
					return new WP_Error( 'rest_invalid_email', __( 'Invalid email address.' ) );
				}
				break;
			case 'ip':
				if ( ! rest_is_ip_address( $value ) ) {
					/* translators: %s: IP address. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%s is not a valid IP address.' ), $param ) );
				}
				break;
			case 'uuid':
				if ( ! wp_is_uuid( $value ) ) {
					/* translators: %s is the name of a JSON field expecting a valid uuid. */
					return new WP_Error( 'rest_invalid_uuid', sprintf( __( '%s is not a valid UUID.' ), $param ) );
				}
				break;
		}
	}

	if ( in_array( $args['type'], array( 'number', 'integer' ), true ) && ( isset( $args['minimum'] ) || isset( $args['maximum'] ) ) ) {
		if ( isset( $args['minimum'] ) && ! isset( $args['maximum'] ) ) {
			if ( ! empty( $args['exclusiveMinimum'] ) && $value <= $args['minimum'] ) {
				/* translators: 1: Parameter, 2: Minimum number. */
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be greater than %2$d' ), $param, $args['minimum'] ) );
			} elseif ( empty( $args['exclusiveMinimum'] ) && $value < $args['minimum'] ) {
				/* translators: 1: Parameter, 2: Minimum number. */
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be greater than or equal to %2$d' ), $param, $args['minimum'] ) );
			}
		} elseif ( isset( $args['maximum'] ) && ! isset( $args['minimum'] ) ) {
			if ( ! empty( $args['exclusiveMaximum'] ) && $value >= $args['maximum'] ) {
				/* translators: 1: Parameter, 2: Maximum number. */
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be less than %2$d' ), $param, $args['maximum'] ) );
			} elseif ( empty( $args['exclusiveMaximum'] ) && $value > $args['maximum'] ) {
				/* translators: 1: Parameter, 2: Maximum number. */
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be less than or equal to %2$d' ), $param, $args['maximum'] ) );
			}
		} elseif ( isset( $args['maximum'] ) && isset( $args['minimum'] ) ) {
			if ( ! empty( $args['exclusiveMinimum'] ) && ! empty( $args['exclusiveMaximum'] ) ) {
				if ( $value >= $args['maximum'] || $value <= $args['minimum'] ) {
					/* translators: 1: Parameter, 2: Minimum number, 3: Maximum number. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be between %2$d (exclusive) and %3$d (exclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
				}
			} elseif ( empty( $args['exclusiveMinimum'] ) && ! empty( $args['exclusiveMaximum'] ) ) {
				if ( $value >= $args['maximum'] || $value < $args['minimum'] ) {
					/* translators: 1: Parameter, 2: Minimum number, 3: Maximum number. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be between %2$d (inclusive) and %3$d (exclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
				}
			} elseif ( ! empty( $args['exclusiveMinimum'] ) && empty( $args['exclusiveMaximum'] ) ) {
				if ( $value > $args['maximum'] || $value <= $args['minimum'] ) {
					/* translators: 1: Parameter, 2: Minimum number, 3: Maximum number. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be between %2$d (exclusive) and %3$d (inclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
				}
			} elseif ( empty( $args['exclusiveMinimum'] ) && empty( $args['exclusiveMaximum'] ) ) {
				if ( $value > $args['maximum'] || $value < $args['minimum'] ) {
					/* translators: 1: Parameter, 2: Minimum number, 3: Maximum number. */
					return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s must be between %2$d (inclusive) and %3$d (inclusive)' ), $param, $args['minimum'], $args['maximum'] ) );
				}
			}
		}
	}

	return true;
}

/**
 * Sanitize a value based on a schema.
 *
 * @since 4.7.0
 * @since 5.5.0 Added the `$param` parameter.
 *
 * @param mixed  $value The value to sanitize.
 * @param array  $args  Schema array to use for sanitization.
 * @param string $param The parameter name, used in error messages.
 * @return mixed|WP_Error The sanitized value or a WP_Error instance if the value cannot be safely sanitized.
 */
function rest_sanitize_value_from_schema( $value, $args, $param = '' ) {
	$allowed_types = array( 'array', 'object', 'string', 'number', 'integer', 'boolean', 'null' );

	if ( ! isset( $args['type'] ) ) {
		/* translators: 1. Parameter */
		_doing_it_wrong( __FUNCTION__, sprintf( __( 'The "type" schema keyword for %s is required.' ), $param ), '5.5.0' );
	}

	if ( is_array( $args['type'] ) ) {
		$best_type = rest_handle_multi_type_schema( $value, $args, $param );

		if ( ! $best_type ) {
			return null;
		}

		$args['type'] = $best_type;
	}

	if ( ! in_array( $args['type'], $allowed_types, true ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			/* translators: 1. Parameter. 2. The list of allowed types. */
			wp_sprintf( __( 'The "type" schema keyword for %1$s can only be one of the built-in types: %2$l.' ), $param, $allowed_types ),
			'5.5.0'
		);
	}

	if ( 'array' === $args['type'] ) {
		$value = rest_sanitize_array( $value );

		if ( ! empty( $args['items'] ) ) {
			foreach ( $value as $index => $v ) {
				$value[ $index ] = rest_sanitize_value_from_schema( $v, $args['items'], $param . '[' . $index . ']' );
			}
		}

		if ( ! empty( $args['uniqueItems'] ) && ! rest_validate_array_contains_unique_items( $value ) ) {
			/* translators: 1: Parameter */
			return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s has duplicate items.' ), $param ) );
		}

		return $value;
	}

	if ( 'object' === $args['type'] ) {
		$value = rest_sanitize_object( $value );

		foreach ( $value as $property => $v ) {
			if ( isset( $args['properties'][ $property ] ) ) {
				$value[ $property ] = rest_sanitize_value_from_schema( $v, $args['properties'][ $property ], $param . '[' . $property . ']' );
			} elseif ( isset( $args['additionalProperties'] ) ) {
				if ( false === $args['additionalProperties'] ) {
					unset( $value[ $property ] );
				} elseif ( is_array( $args['additionalProperties'] ) ) {
					$value[ $property ] = rest_sanitize_value_from_schema( $v, $args['additionalProperties'], $param . '[' . $property . ']' );
				}
			}
		}

		return $value;
	}

	if ( 'null' === $args['type'] ) {
		return null;
	}

	if ( 'integer' === $args['type'] ) {
		return (int) $value;
	}

	if ( 'number' === $args['type'] ) {
		return (float) $value;
	}

	if ( 'boolean' === $args['type'] ) {
		return rest_sanitize_boolean( $value );
	}

	// This behavior matches rest_validate_value_from_schema().
	if ( isset( $args['format'] )
		&& ( ! isset( $args['type'] ) || 'string' === $args['type'] || ! in_array( $args['type'], $allowed_types, true ) )
	) {
		switch ( $args['format'] ) {
			case 'hex-color':
				return (string) sanitize_hex_color( $value );

			case 'date-time':
				return sanitize_text_field( $value );

			case 'email':
				// sanitize_email() validates, which would be unexpected.
				return sanitize_text_field( $value );

			case 'uri':
				return esc_url_raw( $value );

			case 'ip':
				return sanitize_text_field( $value );

			case 'uuid':
				return sanitize_text_field( $value );
		}
	}

	if ( 'string' === $args['type'] ) {
		return strval( $value );
	}

	return $value;
}

/**
 * Append result of internal request to REST API for purpose of preloading data to be attached to a page.
 * Expected to be called in the context of `array_reduce`.
 *
 * @since 5.0.0
 *
 * @param array  $memo Reduce accumulator.
 * @param string $path REST API path to preload.
 * @return array Modified reduce accumulator.
 */
function rest_preload_api_request( $memo, $path ) {
	// array_reduce() doesn't support passing an array in PHP 5.2,
	// so we need to make sure we start with one.
	if ( ! is_array( $memo ) ) {
		$memo = array();
	}

	if ( empty( $path ) ) {
		return $memo;
	}

	$method = 'GET';
	if ( is_array( $path ) && 2 === count( $path ) ) {
		$method = end( $path );
		$path   = reset( $path );

		if ( ! in_array( $method, array( 'GET', 'OPTIONS' ), true ) ) {
			$method = 'GET';
		}
	}

	$path_parts = parse_url( $path );
	if ( false === $path_parts ) {
		return $memo;
	}

	$request = new WP_REST_Request( $method, $path_parts['path'] );
	if ( ! empty( $path_parts['query'] ) ) {
		parse_str( $path_parts['query'], $query_params );
		$request->set_query_params( $query_params );
	}

	$response = rest_do_request( $request );
	if ( 200 === $response->status ) {
		$server = rest_get_server();
		$data   = (array) $response->get_data();
		$links  = $server::get_compact_response_links( $response );
		if ( ! empty( $links ) ) {
			$data['_links'] = $links;
		}

		if ( 'OPTIONS' === $method ) {
			$response = rest_send_allow_header( $response, $server, $request );

			$memo[ $method ][ $path ] = array(
				'body'    => $data,
				'headers' => $response->headers,
			);
		} else {
			$memo[ $path ] = array(
				'body'    => $data,
				'headers' => $response->headers,
			);
		}
	}

	return $memo;
}

/**
 * Parses the "_embed" parameter into the list of resources to embed.
 *
 * @since 5.4.0
 *
 * @param string|array $embed Raw "_embed" parameter value.
 * @return true|string[] Either true to embed all embeds, or a list of relations to embed.
 */
function rest_parse_embed_param( $embed ) {
	if ( ! $embed || 'true' === $embed || '1' === $embed ) {
		return true;
	}

	$rels = wp_parse_list( $embed );

	if ( ! $rels ) {
		return true;
	}

	return $rels;
}

/**
 * Filters the response to remove any fields not available in the given context.
 *
 * @since 5.5.0
 *
 * @param array|object $data    The response data to modify.
 * @param array        $schema  The schema for the endpoint used to filter the response.
 * @param string       $context The requested context.
 * @return array|object The filtered response data.
 */
function rest_filter_response_by_context( $data, $schema, $context ) {
	if ( ! is_array( $data ) && ! is_object( $data ) ) {
		return $data;
	}

	if ( isset( $schema['type'] ) ) {
		$type = $schema['type'];
	} elseif ( isset( $schema['properties'] ) ) {
		$type = 'object'; // Back compat if a developer accidentally omitted the type.
	} else {
		return $data;
	}

	$is_array_type  = 'array' === $type || ( is_array( $type ) && in_array( 'array', $type, true ) );
	$is_object_type = 'object' === $type || ( is_array( $type ) && in_array( 'object', $type, true ) );

	if ( $is_array_type && $is_object_type ) {
		if ( rest_is_array( $data ) ) {
			$is_object_type = false;
		} else {
			$is_array_type = false;
		}
	}

	$has_additional_properties = $is_object_type && isset( $schema['additionalProperties'] ) && is_array( $schema['additionalProperties'] );

	foreach ( $data as $key => $value ) {
		$check = array();

		if ( $is_array_type ) {
			$check = isset( $schema['items'] ) ? $schema['items'] : array();
		} elseif ( $is_object_type ) {
			if ( isset( $schema['properties'][ $key ] ) ) {
				$check = $schema['properties'][ $key ];
			} elseif ( $has_additional_properties ) {
				$check = $schema['additionalProperties'];
			}
		}

		if ( ! isset( $check['context'] ) ) {
			continue;
		}

		if ( ! in_array( $context, $check['context'], true ) ) {
			if ( $is_array_type ) {
				// All array items share schema, so there's no need to check each one.
				$data = array();
				break;
			}

			if ( is_object( $data ) ) {
				unset( $data->$key );
			} else {
				unset( $data[ $key ] );
			}
		} elseif ( is_array( $value ) || is_object( $value ) ) {
			$new_value = rest_filter_response_by_context( $value, $check, $context );

			if ( is_object( $data ) ) {
				$data->$key = $new_value;
			} else {
				$data[ $key ] = $new_value;
			}
		}
	}

	return $data;
}

/**
 * Sets the "additionalProperties" to false by default for all object definitions in the schema.
 *
 * @since 5.5.0
 *
 * @param array $schema The schema to modify.
 * @return array The modified schema.
 */
function rest_default_additional_properties_to_false( $schema ) {
	$type = (array) $schema['type'];

	if ( in_array( 'object', $type, true ) ) {
		if ( isset( $schema['properties'] ) ) {
			foreach ( $schema['properties'] as $key => $child_schema ) {
				$schema['properties'][ $key ] = rest_default_additional_properties_to_false( $child_schema );
			}
		}

		if ( ! isset( $schema['additionalProperties'] ) ) {
			$schema['additionalProperties'] = false;
		}
	}

	if ( in_array( 'array', $type, true ) ) {
		if ( isset( $schema['items'] ) ) {
			$schema['items'] = rest_default_additional_properties_to_false( $schema['items'] );
		}
	}

	return $schema;
}

/**
 * Gets the REST API route for a post.
 *
 * @since 5.5.0
 *
 * @param int|WP_Post $post Post ID or post object.
 * @return string The route path with a leading slash for the given post, or an empty string if there is not a route.
 */
function rest_get_route_for_post( $post ) {
	$post = get_post( $post );

	if ( ! $post instanceof WP_Post ) {
		return '';
	}

	$post_type = get_post_type_object( $post->post_type );
	if ( ! $post_type ) {
		return '';
	}

	$controller = $post_type->get_rest_controller();
	if ( ! $controller ) {
		return '';
	}

	$route = '';

	// The only two controllers that we can detect are the Attachments and Posts controllers.
	if ( in_array( get_class( $controller ), array( 'WP_REST_Attachments_Controller', 'WP_REST_Posts_Controller' ), true ) ) {
		$namespace = 'wp/v2';
		$rest_base = ! empty( $post_type->rest_base ) ? $post_type->rest_base : $post_type->name;
		$route     = sprintf( '/%s/%s/%d', $namespace, $rest_base, $post->ID );
	}

	/**
	 * Filters the REST API route for a post.
	 *
	 * @since 5.5.0
	 *
	 * @param string  $route The route path.
	 * @param WP_Post $post  The post object.
	 */
	return apply_filters( 'rest_route_for_post', $route, $post );
}

/**
 * Gets the REST API route for a term.
 *
 * @since 5.5.0
 *
 * @param int|WP_Term $term Term ID or term object.
 * @return string The route path with a leading slash for the given term, or an empty string if there is not a route.
 */
function rest_get_route_for_term( $term ) {
	$term = get_term( $term );

	if ( ! $term instanceof WP_Term ) {
		return '';
	}

	$taxonomy = get_taxonomy( $term->taxonomy );
	if ( ! $taxonomy ) {
		return '';
	}

	$controller = $taxonomy->get_rest_controller();
	if ( ! $controller ) {
		return '';
	}

	$route = '';

	// The only controller that works is the Terms controller.
	if ( 'WP_REST_Terms_Controller' === get_class( $controller ) ) {
		$namespace = 'wp/v2';
		$rest_base = ! empty( $taxonomy->rest_base ) ? $taxonomy->rest_base : $taxonomy->name;
		$route     = sprintf( '/%s/%s/%d', $namespace, $rest_base, $term->term_id );
	}

	/**
	 * Filters the REST API route for a term.
	 *
	 * @since 5.5.0
	 *
	 * @param string  $route The route path.
	 * @param WP_Term $term  The term object.
	 */
	return apply_filters( 'rest_route_for_term', $route, $term );
}

/**
 * Gets the REST route for the currently queried object.
 *
 * @since 5.5.0
 *
 * @return string The REST route of the resource, or an empty string if no resource identified.
 */
function rest_get_queried_resource_route() {
	if ( is_singular() ) {
		$route = rest_get_route_for_post( get_queried_object() );
	} elseif ( is_category() || is_tag() || is_tax() ) {
		$route = rest_get_route_for_term( get_queried_object() );
	} elseif ( is_author() ) {
		$route = '/wp/v2/users/' . get_queried_object_id();
	} else {
		$route = '';
	}

	/**
	 * Filters the REST route for the currently queried object.
	 *
	 * @since 5.5.0
	 *
	 * @param string $link The route with a leading slash, or an empty string.
	 */
	return apply_filters( 'rest_queried_resource_route', $route );
}