+ // if the given url is an local attachment url and the id already exists, don't
+ // save a new file record. This should never happen, but let's make it foolproof
+ // FIXME: how about attachments servers?
+ $u = parse_url($given_url);
+ if (isset($u['host']) && $u['host'] === common_config('site', 'server')) {
+ $r = Router::get();
+ // Skip the / in the beginning or $r->map won't match
+ try {
+ $args = $r->map(mb_substr($u['path'], 1));
+ if ($args['action'] === 'attachment') {
+ try {
+ // $args['attachment'] should always be set if action===attachment, given our routing rules
+ $file = File::getByID($args['attachment']);
+ return $file;
+ } catch (EmptyPkeyValueException $e) {
+ // ...but $args['attachment'] can also be 0...
+ } catch (NoResultException $e) {
+ // apparently this link goes to us, but is _not_ an existing attachment (File) ID?
+ }
+ }
+ } catch (Exception $e) {
+ // Some other exception was thrown from $r->map, likely a
+ // ClientException (404) because of some malformed link to
+ // our own instance. It's still a valid URL however, so we
+ // won't abort anything... I noticed this when linking:
+ // https://social.umeahackerspace.se/mmn/foaf' (notice the
+ // apostrophe in the end, making it unrecognizable for our
+ // URL routing.
+ // That specific issue (the apostrophe being part of a link
+ // is something that may or may not have been fixed since,
+ // in lib/util.php in common_replace_urls_callback().
+ }
+ }
+