rest_validate_value_from_schema( mixed $value, array $args, string $param = '' )

function rest_validate_value_from_schema( $value, $args, $param = '' ) {
	if ( 'array' === $args['type'] ) {
		if ( ! is_array( $value ) ) {
			$value = preg_split( '/[\s,]+/', $value );
		}
		if ( ! wp_is_numeric_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' ) );
		}
		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 ( 'object' === $args['type'] ) {
		if ( $value instanceof stdClass ) {
			$value = (array) $value;
		}
		if ( ! 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, 'object' ) );
		}

		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'] ) && false === $args['additionalProperties'] ) {
				return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$s is not a valid property of Object.' ), $property ) );
			}
		}
	}

	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' ) ) && ! 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'] && round( floatval( $value ) ) !== floatval( $value ) ) {
		/* translators: 1: parameter, 2: type name */
		return new WP_Error( 'rest_invalid_param', sprintf( __( '%1$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.' ), $value, 'boolean' ) );
	}

	if ( 'string' === $args['type'] && ! 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['format'] ) ) {
		switch ( $args['format'] ) {
			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.' ), $value ) );
				}
				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;
}