/**
* Wrapper for Zend\Version::getLatest with caching functionality, so that
* ZfjPageBanner won't act as a "DDoS bot-network".
*
* @param string $currentVersion
* @return array
*/
protected function getLatestVersion($currentVersion)
{
if (!$this->options->isVersionCheckEnabled()) {
return array(true, '');
}
$cacheDir = $this->options->getCacheDir();
// exit early if the cache dir doesn't exist,
// to prevent hitting the GitHub API for every request.
if (!is_dir($cacheDir)) {
return array(true, '');
}
if (file_exists($cacheDir . '/ZDT_ZF_Version.cache')) {
$cache = file_get_contents($cacheDir . '/ZDT_ZF_Version.cache');
$cache = explode('|', $cache);
if ($cache[0] + self::VERSION_CACHE_TTL > time()) {
// the cache file was written before the version was upgraded.
if ($currentVersion === $cache[2] || $cache[2] === 'N/A') {
return array(true, '');
}
return array($cache[1] === 'yes' ? true : false, $cache[2]);
}
}
$isLatest = Version::isLatest();
$latest = Version::getLatest();
file_put_contents($cacheDir . '/ZDT_ZF_Version.cache', sprintf('%d|%s|%s', time(), $isLatest ? 'yes' : 'no', $latest === null ? 'N/A' : $latest));
return array($isLatest, $latest);
}
