+
+* user(username)
+
+ Tests whether the attachment is being uploaded by a user with the
+ specified username. If openid is enabled, an openid can also be put here.
+
+* ip(address)
+
+ Tests whether the attacment is being uploaded from the specified IP
+ address.
+
+* mimetype(foo/bar)
+
+ If the [[cpan File::MimeInfo::Magic]] perl module is installed, this
+ allows checking the mime type of the attachment. You can include a glob
+ in the type, for example `mimetype(image/*)`.