<?php
// Copy into a private PHP include in your Plesk project, not a public download folder.
function pnacJson(string $path): array {
    if (!preg_match('~^/shared/[a-zA-Z0-9_/-]+\.json$~D', $path) || str_contains($path, '..')) {
        throw new InvalidArgumentException('Invalid public resource path');
    }
    foreach (['https://pnac.online', 'https://pnac.link'] as $origin) {
        $curl = curl_init($origin . $path);
        curl_setopt_array($curl, [CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CONNECTTIMEOUT => 3, CURLOPT_TIMEOUT => 8,
            CURLOPT_FOLLOWLOCATION => false, CURLOPT_SSL_VERIFYPEER => true,
            CURLOPT_SSL_VERIFYHOST => 2, CURLOPT_PROTOCOLS => CURLPROTO_HTTPS]);
        $body = curl_exec($curl);
        $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        curl_close($curl);
        if ($body !== false && $status === 200) {
            try {
                $data = json_decode($body, true, 512, JSON_THROW_ON_ERROR);
                if (is_array($data)) return $data;
            } catch (JsonException $e) { /* Try the second server. */ }
        }
    }
    throw new RuntimeException('Both PNAC resource servers are unavailable');
}