Fix: curl manifest futilely includes external LungMAP files (#8027)

Author: nadove-ucsc

src/azul/service/index_service.py

@@ -366,6 +366,14 @@ def azul_file_url(self,
         if drs_uri is None:
             # To download a file we need its DRS URI
             return None
+        elif (
+            config.catalogs[self.catalog].atlas == 'lungmap'
+            and drs_uri.startswith('drs://dg.4503:')
+        ):
+            # Lungmap contains external files hosted on BioDataCatalyst.
+            # Downloading these files requires authentication that can't be
+            # provided by Azul, and our file URL fails with a 401.
+            return None
         else:
             special_fields = self.metadata_plugin.special_fields
             return str(self.file_url_func(catalog=self.catalog,