basic support for remote slice and list indexing of data arrays

bt5/erp5_wendelin/DocumentTemplateItem/portal_components/document.erp5.DataArray.py

@@ -147,6 +147,21 @@ class DataArray(BigFile):
     RESPONSE.setHeader("Content-Type", "application/octet-stream")
     # HTTP Range header handling: return True if we've served a range
     # chunk out of our data.
+    # convert ranges from bytes to array indices
+    slice_index = REQUEST.get('slice_index', None)
+    if slice_index is not None:
+      slice_index_list = []
+      for index in slice_index:
+        slice_index_list.append(slice(index.get('start'),
+                                      index.get('stop'),
+                                      index.get('step')))
+      list_index = REQUEST.get('list_index', None)
+      if list_index is not None:
+        RESPONSE.write(self.getArray()[tuple(slice_index_list)][list_index].tobytes())
+      else:
+        RESPONSE.write(self.getArray()[tuple(slice_index_list)].tobytes())
+      return True
+
     range = REQUEST.get_header('Range', None)
     request_range = REQUEST.get_header('Request-Range', None)
     if request_range is not None: