- try {
- $file = File::getByUrl($given_url);
- } catch (NoResultException $e) {
- // First check if we have a lookup trace for this URL already
- try {
- $file_redir = File_redirection::getByUrl($given_url);
- $file = File::getKV('id', $file_redir->file_id);
- if (!$file instanceof File) {
- // File did not exist, let's clean up the File_redirection entry
- $file_redir->delete();
- }
- } catch (NoResultException $e) {
- // We just wanted to doublecheck whether a File_thumbnail we might've had
- // actually referenced an existing File object.
- }
- }
-
- // If we still don't have a File object, let's create one now!
- if (!$file instanceof File) {
- // @fixme for new URLs this also looks up non-redirect data
- // such as target content type, size, etc, which we need
- // for File::saveNew(); so we call it even if not following
- // new redirects.
- $redir_data = File_redirection::where($given_url);
- if (is_array($redir_data)) {
- $redir_url = $redir_data['url'];
- } elseif (is_string($redir_data)) {
- $redir_url = $redir_data;
- $redir_data = array();
- } else {
- // TRANS: Server exception thrown when a URL cannot be processed.
- throw new ServerException(sprintf(_("Cannot process URL '%s'"), $given_url));
- }
-
- if ($redir_url === $given_url || !$followRedirects) {
- // Save the File object based on our lookup trace
- $file = File::saveNew($redir_data, $given_url);
- } else {
- // This seems kind of messed up... for now skipping this part
- // if we're already under a redirect, so we don't go into
- // horrible infinite loops if we've been given an unstable
- // redirect (where the final destination of the first request
- // doesn't match what we get when we ask for it again).
- //
- // Seen in the wild with clojure.org, which redirects through
- // wikispaces for auth and appends session data in the URL params.
- $file = self::processNew($redir_url, $notice, /*followRedirects*/false);
- File_redirection::saveNew($redir_data, $file->id, $given_url);
- }
-
- if (!$file instanceof File) {
- // This should only happen if File::saveNew somehow did not return a File object,
- // though we have an assert for that in case the event there might've gone wrong.
- // If anything else goes wrong, there should've been an exception thrown.
- throw new ServerException('URL processing failed without new File object');
- }