<?php

namespace WPMailSMTP\Vendor\Aws\Crypto;

use WPMailSMTP\Vendor\Aws\HasDataTrait;
use ArrayAccess;
use IteratorAggregate;
use InvalidArgumentException;
use JsonSerializable;
use WPMailSMTP\Vendor\ReturnTypeWillChange;
/**
 * Stores encryption metadata for reading and writing.
 *
 * @internal
 */
class MetadataEnvelope implements \ArrayAccess, \IteratorAggregate, \JsonSerializable
{
    use HasDataTrait;
    const CONTENT_KEY_V2_HEADER = 'x-amz-key-v2';
    const IV_HEADER = 'x-amz-iv';
    const MATERIALS_DESCRIPTION_HEADER = 'x-amz-matdesc';
    const KEY_WRAP_ALGORITHM_HEADER = 'x-amz-wrap-alg';
    const CONTENT_CRYPTO_SCHEME_HEADER = 'x-amz-cek-alg';
    const CRYPTO_TAG_LENGTH_HEADER = 'x-amz-tag-len';
    const UNENCRYPTED_CONTENT_LENGTH_HEADER = 'x-amz-unencrypted-content-length';
    private static $constants = [];
    public static function getConstantValues()
    {
        if (empty(self::$constants)) {
            $reflection = new \ReflectionClass(static::class);
            foreach (\array_values($reflection->getConstants()) as $constant) {
                self::$constants[$constant] = \true;
            }
        }
        return \array_keys(self::$constants);
    }
    public function offsetSet($name, $value)
    {
        $constants = self::getConstantValues();
        if (\is_null($name) || !\in_array($name, $constants)) {
            throw new \InvalidArgumentException('MetadataEnvelope fields must' . ' must match a predefined offset; use the header constants.');
        }
        $this->data[$name] = $value;
    }
    #[ReturnTypeWillChange]
    public function jsonSerialize()
    {
        return $this->data;
    }
}