Use os.path.splitext to extract file extension

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38376 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Tool/ContributionTool.py

@@ -330,9 +330,11 @@ class ContributionTool(BaseTool):
       property_dict['portal_type'] = (property_dict['portal_type'],)
     else:
       # we have to find candidates by file extenstion
-      if file_name.rfind('.')!= -1:
-        ext = file_name.split('.')[-1]
-        property_dict['portal_type'] = self.ContributionTool_getCandidateTypeListByExtension(ext)
+      basename, extension = os.path.splitext(file_name)
+      if extension:
+        extension = extension.lstrip('.') # remove first dot
+        property_dict['portal_type'] =\
+               self.ContributionTool_getCandidateTypeListByExtension(extension)
     return property_dict
 
   # WebDAV virtual folder support