/**
* See if the file is cached on S3.
* @return mixed
*/
public function checkForS3Cache()
{
/* if using a CNAME alias, set here (ensure is postfixed with /) */
$s3hostAliasLen = strlen($this->config['s3hostAlias']);
if (!empty($this->config['s3hostAlias'])) {
$this->config['s3hostAlias'] = str_replace(array('http://', 'https://'), '', $this->config['s3hostAlias']);
if (substr($this->config['s3hostAlias'], $s3hostAliasLen - 1, $s3hostAliasLen) != '/') {
$this->config['s3hostAlias'] .= '/';
}
}
$s3host = !empty($this->config['s3hostAlias']) ? $this->config['s3hostAlias'] : $this->config['s3hostDefault'];
/* calc relative path of image in s3 bucket */
$path = str_replace('//', '/', $this->config['s3path'] . $this->cacheFilename);
$this->expired = true;
$lastModified = 0;
$s3imageUrl = '';
/* check with php's get_headers (slower) */
if ($this->config['s3headersCheck']) {
$this->modx->log(modX::LOG_LEVEL_DEBUG, '[phpthumbof] Using get_headers to check modified.');
$s3imageUrl = 'http://' . str_replace('//', '/', $s3host . urlencode($path));
$headers = get_headers($s3imageUrl, 1);
if (!empty($headers) && !empty($headers[0]) && $headers[0] == 'HTTP/1.1 200 OK') {
if (empty($headers['Last-Modified'])) {
$this->expired = true;
} else {
$this->expired = false;
$lastModified = $headers['Last-Modified'];
$lastModified = strtotime(trim($lastModified[1]));
}
} else {
$this->expired = true;
}
} else {
/* otherwise use amazon's (faster) get object info */
$this->modx->log(modX::LOG_LEVEL_DEBUG, '[phpthumbof] Using get_object_url to check modified.');
$s3response = $this->aws->getFileUrl($path);
if (!empty($s3response) && is_object($s3response) && !empty($s3response->body) && !empty($s3response->status) && $s3response->status == 200) {
/* check expiry for image */
$this->expired = false;
$lastModified = strtotime($s3response->header['last-modified']);
$s3imageUrl = $s3response->header['_info']['url'];
if (!empty($this->config['s3hostAlias'])) {
$s3imageUrl = str_replace($this->config['s3hostDefault'], $this->config['s3hostAlias'], $s3imageUrl);
}
}
}
/* check to see if expired */
if (!empty($lastModified)) {
/* use last-modified to determine age */
$maxAge = (int) $this->modx->getOption('phpthumbof.s3_cache_time', null, 24) * 60 * 60;
$now = time();
if ($now - $lastModified > $maxAge) {
$this->expired = true;
}
}
/* if not expired past the cache time, use that url. otherwise, delete from S3 */
if (!$this->expired) {
$this->phpThumbOf->endDebug();
return $s3imageUrl;
}
$this->aws->deleteObject($path);
return true;
}
