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Edit File: AsEncryptedCollection.php

<?php

namespace Illuminate\Database\Eloquent\Casts;

use Illuminate\Contracts\Database\Eloquent\Castable;
use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Crypt;
use InvalidArgumentException;

class AsEncryptedCollection implements Castable
{
    /**
     * Get the caster class to use when casting from / to this cast target.
     *
     * @param  array  $arguments
     * @return \Illuminate\Contracts\Database\Eloquent\CastsAttributes<\Illuminate\Support\Collection<array-key, mixed>, iterable>
     */
    public static function castUsing(array $arguments)
    {
        return new class($arguments) implements CastsAttributes
        {
            public function __construct(protected array $arguments)
            {
            }

public function get($model, $key, $value, $attributes)
            {
                $collectionClass = $this->arguments[0] ?? Collection::class;

if (! is_a($collectionClass, Collection::class, true)) {
                    throw new InvalidArgumentException('The provided class must extend ['.Collection::class.'].');
                }

if (isset($attributes[$key])) {
                    return new $collectionClass(Json::decode(Crypt::decryptString($attributes[$key])));
                }

return null;
            }

public function set($model, $key, $value, $attributes)
            {
                if (! is_null($value)) {
                    return [$key => Crypt::encryptString(Json::encode($value))];
                }

return null;
            }
        };
    }

/**
     * Specify the collection for the cast.
     *
     * @param  class-string  $class
     * @return string
     */
    public static function using($class)
    {
        return static::class.':'.$class;
    }
}

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