Validate a list a comma-seperated list against an Enum

EnumList.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class EnumList implements Rule
{
    private $enumClass;

    public function __construct($enumClass)
    {
        $this->enumClass = $enumClass;
    }

    public function passes($attribute, $value): bool
    {
        $validValues = [];
        foreach ($this->enumClass::cases() as $enum) {
            $validValues[$enum->name] = $enum->value;
        }
        $inputValues = collect(explode(',', $value))->map(fn ($v) => trim($v));

        return $inputValues->diff(collect($validValues))->isEmpty();
    }

    public function message(): string
    {
        return "The :attribute values are not valid.";
    }
}