Util.php

<?php

require __DIR__ . '/vendor/autoload.php';

use Lacuna\Amplia\AmpliaClient;
use Lacuna\Cloudhub\CloudhubClient;
use Lacuna\RestPki\RestPkiOptions;
use Lacuna\RestPki\RestPkiCoreClient;
use Lacuna\RestPki\RestPkiClient;
use Lacuna\RestPki\StandardSecurityContexts;
use Lacuna\PkiExpress\TimestampAuthority;
class Util {

    //region REST PKI

    public static function getRestPkiClient()
    {
        // Get configuration.
        $config = getConfig();

        // Get your token value from REST PKI configuration.
        $accessToken = $config['restPki']['accessToken'];

        // Throw exception if token is not set (this check is here just for the sake of newcomers, you
        // can remove it).
        if (empty($accessToken) || strpos($accessToken, ' ACCESS TOKEN ') !== false) {
            throw new \Exception('The REST PKI access token was not set! Hint: to run this ' .
                'sample you must generate an API access token on the REST PKI website and paste it ' .
                'on the file config.php');
        }

        $endpoint = $config['restPki']['endpoint'];

        return new RestPkiClient($endpoint, $accessToken);
    }

    public static function getCloudhubClient() 
    {
        $config = getConfig();
        $apiKey = $config['cloudHub']['apiKey'];

        if (empty($apiKey) || strpos($apiKey, ' API KEY ') !== false) {
            throw new \Exception('The Cloudhub API Key was not set!');
        }

        $endpoint = $config['cloudHub']['endpoint'];
        return new CloudhubClient($endpoint, $apiKey);
    }

    public static function getSecurityContextId()
    {
        // Get configuration.
        $config = getConfig();

        if ($config['trustLacunaTestRoot']) {
            return StandardSecurityContexts::LACUNA_TEST;
        }

        // In production, accept only certificates from ICP-Brasil.
        return StandardSecurityContexts::PKI_BRAZIL;
    }

    //endregion
    
    public static function setExpiredPage()
    {
        header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 3600) . ' GMT');
        header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
        header('Cache-Control: private, no-store, max-age=0, no-cache, must-revalidate, post-check=0, pre-check=0');
        header('Pragma: no-cache');
    }

    public static function getDateYearsFromNow($years)
    {
        return date('Y-m-d', strtotime("+{$years} years"));
    }

    public static function joinStringsPt($strings)
    {
        $text = '';
        $count = count($strings);
        $index = 0;
        foreach ($strings as $s) {
            if ($index > 0) {
                if ($index < $count - 1) {
                    $text .= ', ';
                } else {
                    $text .= ' e ';
                }
            }
            $text .= $s;
            ++$index;
        }
        return $text;
    }
}