Support date based on property.

master/product/Vifib/Tool/VifibRestApiV1Tool.py

@@ -73,7 +73,7 @@ def requireHeader(header_dict):
     return wrapperRequireHeader
   return outer
 
-def supportModifiedSince(document_url_id=None):
+def supportModifiedSince(document_url_id=None, modified_property_id=None):
   def outer(fn):
     def wrapperSupportModifiedSince(self, *args, **kwargs):
       modified_since = self.REQUEST.getHeader('If-Modified-Since')
@@ -89,10 +89,14 @@ def supportModifiedSince(document_url_id=None):
             # client send date before current time, shall continue and
             # compare with second precision, as client by default shall set
             # If-Modified-Since to last known Last-Modified value
-            if document_url_id is None:
+            document = None
+            if document_url_id is None and modified_property_id is None:
               document = self
-            else:
+            elif document_url_id is not None:
               document = self.restrictedTraverse(getattr(self, document_url_id))
+            else:
+              document_date = getattr(self, modified_property_id)
+            if document is not None:
               document_date = document.getModificationDate() or \
                 self.bobobase_modification_time()
             if int(document_date.timeTime()) <= int(modified_since.timeTime()):