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;
        }

        $certFile = "/etc/letsencrypt/live/$domain/fullchain.pem";
        if (!file_exists($certFile)) {
            http_response_code(404);
            echo json_encode(['error' => 'SSL certificate not found']);
            return;
        }

        $certData = openssl_x509_parse(file_get_contents($certFile));
        if (!$certData || !isset($certData['validTo_time_t'])) {
            http_response_code(500);
            echo json_encode(['error' => 'Failed to parse SSL certificate']);
            return;
        }

        $expiryTimestamp = $certData['validTo_time_t'];
        $expiryDate = date('Y-m-d', $expiryTimestamp);
        $daysRemaining = ceil(($expiryTimestamp - time()) / 86400);

        echo json_encode([
	        'ssl_expiry' => $expiryDate,
	        'ssl_remaining' => $daysRemaining
	    ]);
    }
}