// uid contains the uid of the user that created the CertificateSigningRequest.
  // Populated by the API server on creation and immutable.
  // +optional
  optional string uid = 3;

  // groups contains group membership of the user that created the CertificateSigningRequest.
  // Populated by the API server on creation and immutable.
  // +listType=atomic
  // +optional
  repeated string groups = 4;

is optional and can be used to specify additional attributes to lookup on the User DN record in the LDAP server. This is for certain display purposes and may be used for extended functionality that may be added in the future.

### Group membership search

MinIO can be optionally configured to find the groups of a user from AD/LDAP by specifying the following variables:

```

     * <p/>
     * This method is designed to assist with computing access control for a
     * given user when the target object's ACL has local groups. Local groups
     * are not listed in a user's group membership (e.g. as represented by the
     * tokenGroups constructed attribute retrived via LDAP).
     * <p/>
     * Domain groups nested inside a local group are currently not expanded. In