File upload fails on GCP with group mail

[dojeda]

When there is a mail that is not a user email but a group email, uploading a file fails with a 400 error while setting the blob permissions:

WARNING quetzal.app.api.data.file 2019-09-17 15:33:41 Failed to set file permissions
Traceback (most recent call last):
  File "/code/quetzal/app/api/data/file.py", line 137, in create
    storage.set_permissions(obj, workspace.owner)
  File "/code/quetzal/app/api/data/storage/__init__.py", line 73, in set_permissions
    return gcp.set_permissions(file_obj, owner)
  File "/code/quetzal/app/api/data/storage/gcp.py", line 60, in set_permissions
    acl.save()
  File "/usr/local/lib/python3.6/site-packages/google/cloud/storage/acl.py", line 504, in save
    self._save(acl, None, client)
  File "/usr/local/lib/python3.6/site-packages/google/cloud/storage/acl.py", line 476, in _save
    query_params=query_params,
  File "/usr/local/lib/python3.6/site-packages/google/cloud/_http.py", line 319, in api_request
    raise exceptions.from_http_response(response)
google.api_core.exceptions.BadRequest: 400 PATCH https://www.googleapis.com/storage/v1/b/quetzal-ws-73-operator-benchmark/o/20190917-151546.hdf5?projection=full: Group set as user: [email protected]

This should not be a 400 but a 500. More importantly, the GCP backend should manage the group e-mail correctly.