SerializedValueContainer.php

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<?php
 
class SerializedValueContainer {
    private const SCHEMA = '__svc_schema__';
    // 64 bit UID
    private const SCHEMA_UNIFIED = 'DAAIDgoKAQw';
    // 64 bit UID
    private const SCHEMA_SEGMENTED = 'CAYCDAgCDw4';
 
    public const UNIFIED_DATA = '__data__';
    public const SEGMENTED_HASHES = '__hashes__';
 
    public static function newUnified( $serialized ) {
        return (object)[
            self::SCHEMA => self::SCHEMA_UNIFIED,
            self::UNIFIED_DATA => $serialized
        ];
    }
 
    public static function newSegmented( array $segmentHashList ) {
        return (object)[
            self::SCHEMA => self::SCHEMA_SEGMENTED,
            self::SEGMENTED_HASHES => $segmentHashList
        ];
    }
 
    public static function isUnified( $value ) {
        return (
            $value instanceof stdClass &&
            ( $value->{self::SCHEMA} ?? null ) === self::SCHEMA_UNIFIED
        );
    }
 
    public static function isSegmented( $value ) {
        return (
            $value instanceof stdClass &&
            ( $value->{self::SCHEMA} ?? null ) === self::SCHEMA_SEGMENTED
        );
    }
}