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Editing: CacheGoogleFont.php

<?php

namespace Nextend\Framework\Cache;

use Nextend\Framework\Filesystem\Filesystem;
use Nextend\Framework\Misc\HttpClient;

class CacheGoogleFont extends AbstractCache {

protected $_storageEngine = 'filesystem';
    private $fontExtension;

public function __construct() {
        parent::__construct('googlefonts', true);
    }

/**
     * @param string $url
     *
     * @return boolean|string The path of the cached file
     */
    public function makeCache($url, $extension) {

$hash = $this->generateHash($url);

$fileName              = $hash;
        $fileNameWithExtension = $fileName . '.' . $extension;

$isCached = $this->exists($fileNameWithExtension);

if ($isCached) {
            if (!$this->testManifestFile($fileName)) {
                $isCached = false;
            }
        }

if (!$isCached) {

$cssContent = HttpClient::get($url);

if (!$cssContent) {
                return false;
            }

if ($extension === 'css') {
                $fontExtensions = array(
                    'woff2',
                    'ttf'
                );

foreach ($fontExtensions as $this->fontExtension) {
                    $cssContent = preg_replace_callback('/url$["\']?(.*?\.' . $this->fontExtension . ')["\']?$/i', function ($matches) {

$url = $matches[1];

$cache = new CacheGoogleFont();

$path = $cache->makeCache($url, $this->fontExtension);

if ($path) {
                            $url = Filesystem::pathToAbsoluteURL($path);
                        }

return 'url(' . $url . ')';
                    }, $cssContent);
                }
            }

$this->set($fileNameWithExtension, $cssContent);

$this->createManifestFile($fileName);
        }

return $this->getPath($fileNameWithExtension);
    }

private function generateHash($url) {
        return md5($url);
    }

protected function testManifestFile($fileName) {
        $manifestKey = $this->getManifestKey($fileName);
        if ($this->exists($manifestKey)) {

$manifestData = json_decode($this->get($manifestKey), true);

if ($manifestData['mtime'] > strtotime('-30 days')) {
                return true;
            }
        }

return false;
    }

protected function createManifestFile($fileName) {

$this->set($this->getManifestKey($fileName), json_encode($this->getManifestData()));
    }

private function getManifestData() {

return array(
            'mtime' => time()
        );
    }

protected function getManifestKey($fileName) {
        return $fileName . '.manifest';
    }
}

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