import kepub as epub, http://wiki.mobileread.com/wiki/Kepub

oml/item/handlers.py

@@ -180,6 +180,8 @@ class UploadHandler(tornado.web.RequestHandler):
                         while os.path.exists(import_name):
                             n += 1
                             name, extension = filename.rsplit('.', 1)
+                            if extension == 'kepub':
+                                extension = 'epub'
                             import_name = os.path.join(prefix_imported, '%s [%d].%s' % (name, n, extension))
                         with open(import_name, 'wb') as fd:
                             fd.write(upload.body)