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<?php

namespace Aws\Crypto;

use Aws\HasDataTrait;

use \ArrayAccess;

use \IteratorAggregate;

use \InvalidArgumentException;

use \JsonSerializable;

/**

 * 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);

    }

    /**

     * @return void

     */

    #[\ReturnTypeWillChange]

    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;

    }

}