whmcsBuilder/controllers/GetSSLDaysController.php

<?php

namespace application\controllers;

class GetSSLDaysController {
    public static function getSSLDays($data): void {
        $domain = $data['domain'] ?? '';
        if (empty($domain)) {
            http_response_code(400);
            echo json_encode(['error' => 'Missing required parameter: domain']);
            return;
        }

        exec("sudo certbot certificates --cert-name $domain | grep 'Expiry' | grep 'Expiry'", $phpOutput, $phpReturnCode);

        if(empty($phpOutput)){
            echo json_encode([
                'ssl_expiry' => "-",
                'ssl_remaining' => "-"
            ]);
        } else {
            $sslData = explode(" ",$phpOutput[0]);
            echo json_encode([
                'ssl_expiry' => $sslData[6],
                'ssl_remaining' => $sslData[9]
            ]);
        }
    }
}