stylers-llc/laravel-task-manager

<?php declare(strict_types=1);

namespace Stylers\TaskManager\Traits;

use InvalidArgumentException;

trait CronExpressionValidator
{
    public function validateExpression(string $expression): void
    {
        $parts = explode(' ', $expression);

        if ($this->isInvalidMacro($expression)) {
            throw new InvalidArgumentException(sprintf("Macro doesn't exists: %s", $expression));
        }

        if (! $this->isValidMinute($parts[0])) {
            throw new InvalidArgumentException('Minute must be a number between 0 and 59 or "*", "/", "-", ",".');
        }

        if (! $this->isValidHour($parts[1])) {
            throw new InvalidArgumentException('Hour must be a number between 0 and 23 or "*", "/", "-", ",".');
        }

        if (! $this->isValidDayOfMonth($parts[2])) {
            throw new InvalidArgumentException('Day of Month must be a number between 1 and 31 or "*", "/", "-", ",".');
        }

        if (! $this->isValidMonth($parts[3])) {
            throw new InvalidArgumentException('Month must be a number between 1 and 12 or "*", "/", "-", ",".');
        }

        if (! $this->isValidDayOfWeek($parts[4])) {
            throw new InvalidArgumentException(
                'Day of Week must be a number between 0 and 7 (Sunday=0 or 7) or "*", "/", "-", ",".'
            );
        }
    }

    private function isInvalidMacro(string $expression): bool
    {
        return strpos($expression, '@') === 0
            && ! preg_match(
                '/^@(annually|yearly|monthly|weekly|daily|hourly|reboot)|(@every (\d{1,4}(ns|us|µs|ms|s|m|h))+)$/u',
                $expression
            );
    }

    private function isValidMinute(string $minutePart): bool
    {
        return (bool) preg_match('/^(([1-5]?\d)([\/|,\-]\d{0,2})?|\*)$/', $minutePart);
    }

    private function isValidHour(string $hourPart): bool
    {
        return (bool) preg_match('/^((2[0-3]|1\d|\d)([\/,\-]\d{0,2})?|\*)$/', $hourPart);
    }

    private function isValidDayOfMonth(string $dayOfMonthPart): bool
    {
        return (bool) preg_match('/^((3[01]|[12]\d|[1-9])(\/\d+)?|\*|-)$/', $dayOfMonthPart);
    }

    private function isValidMonth(string $monthPart): bool
    {
        return (bool) preg_match('/^((1[0-2]|[1-9])(\/\d+)?|\*|-)$/', $monthPart);
    }

    private function isValidDayOfWeek(string $dayOfWeekPart): bool
    {
        return (bool) preg_match('/^(([0-7])(\/\d+)?|\*|-)$/', $dayOfWeekPart);
    }
}