Filename turns a transport:ref URI into a filename containing the top-level identifier of the image.

IsValid returns whether or not the given source is valid.

Split splits a URI into it's components which can be used directly through containers/image This can be tricky if there is no type but a file name contains a colon.

HTTP is the keyword for http ref.

HTTPS is the keyword for https ref.

Library is the keyword for a library ref.

Oras is the keyword for an oras ref.

Shub is the keyword for a shub ref.