public static function processRequest(array $params)
{
// set timezone if unset to avoid warnings
date_default_timezone_set(@date_default_timezone_get());
// set memory limit if required
if ($params['memoryLimit']) {
$inibytes = self::returnBytes(ini_get('memory_limit'));
$ourbytes = self::returnBytes($params['memoryLimit']);
if ($inibytes < $ourbytes) {
@ini_set('memory_limit', $params['memoryLimit']);
}
}
// load up the configured rate limiter class, if any
if (!empty($params['rateLimiter'])) {
$limiter = $params['rateLimiter'];
// if the configured class does not exist, this is a hack attempt and someone is hitting the imthumb.php script directly to bypass rate limiting
if (!class_exists($limiter)) {
$remoteIPString = isset($_SERVER['HTTP_CLIENT_IP']) ? $_SERVER['HTTP_CLIENT_IP'] : (isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : (isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : ''));
throw new ImThumbCriticalException("Rate limiter class not found, hack attempt! Source {$remoteIPString}", ImThumb::ERR_HACK_ATTEMPT);
}
$params['rateLimiter'] = new $limiter();
}
$handler = new ImThumb($params);
$http = new ImThumbHTTP($handler, $params);
try {
// check for referrer
if (!$params['externalReferrerAllowed'] && !self::isReferrerOk()) {
self::quickImageResponse('leeching');
}
// check for rate limiting
if (!$handler->checkRateLimits()) {
self::quickImageResponse('ratelimited');
}
// load up the image
$handler->loadImage($params['src']);
// check for browser cache
if ($handler->hasBrowserCache()) {
$http->sendHeaders();
exit(0);
}
// check and write to caches
if (!$handler->writeCache()) {
// check cache directory for expired content if we processed an already cached image
if ($handler->cache) {
$handler->cache->checkExpiredCaches();
}
}
// output the image and all headers
if (!$http->display()) {
// nothing to display, we aren't configured to show any fallback 404 image
throw new ImThumbCriticalException("Source image not found. Source querystring: {$_SERVER['QUERY_STRING']}", ImThumb::ERR_SERVER_CONFIG);
}
} catch (Exception $e) {
if ($e instanceof ImThumbCriticalException) {
throw $e;
}
// attempt to load any configured error image. If this errors out it will just throw the exception naturally.
$handler->loadErrorImage();
$handler->configureUnalteredFitImage();
$handler->doResize();
if ($e instanceof ImThumbException) {
if ($e->getCode() == ImThumb::ERR_SRC_IMAGE) {
// log the querystring passed in addition to regular message
$msg = $e->getMessage() . ' Source querystring: ' . $_SERVER['QUERY_STRING'];
} else {
$msg = $e->getMessage();
}
} else {
$msg = 'Unknown error ' . $e->getCode() . ': ' . $e->getMessage();
}
$theImage = $handler->getImage();
if (!$theImage) {
throw $e;
}
$http->sendHeaders($msg);
echo $theImage;
exit(0);
}
}
