CREDENTIALS is used to exchange username/password for access token using an oauth or "Docker Registry Token" server.

HEADER is used to set the HTTP Authorization header to secret directly for the registry.

REFRESH is used to exchange secret for access token using an oauth or "Docker Registry Token" server.

Enum value maps for AuthType.

Enum value maps for AuthType.

AuthRequest is sent as a callback on a stream.

ImageReference is used to create or find a reference for an image.