Authorize will return a service error if the context cannot access the given namespace.

AuthorizeAdmin returns a service error if the context is not an admin that can access this namespace e.g.

Public indicates a namespace is public and can be accessed by anyone.

DefaultNamespace used by the server.

ErrForbidden is returned by Authorize when a context is trying to access a namespace it doesn't have access to.

ErrUnauthorized is returned by Authorize when a context without a blank account tries to access a restricted namespace.

AuthorizeOptions are used to configure the Authorize method.

AuthorizeOption sets an attribute on AuthorizeOptions.