<?php
 
namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class SynChallenge implements Rule
{
    /* The challenge mechanisms that can be forced for SYNs. */
    public const VALID_CHALLENGES = [ 'cookie', 'safe-reset' ];

    public function passes($attribute, $value)
    {

        if($value === null) {
            return true;
        }

        return is_string($value) && in_array($value, self::VALID_CHALLENGES, true);

    }
 
    public function message()
    {
        return 'The :attribute must be null, `cookie` or `safe-reset`.';
    }
}