Closed EskoDijk closed 8 months ago
If you wanted to do application/voucher-cbor+cose
you'd need to define and register +cose
in the SSS registry because it's not there yet.
Thanks @thomas-fossati, I see now the RFC 6838 guidance on this. The suffix behind the '+' ought to be an already-registered encoding standard. And here the '+cbor' makes sense, as the underlying syntax of the (outer) COSE object is itself also plain CBOR -- besides being COSE.
Adding +cose
to the SSS registry would give some complications maybe; for some reason the COSE RFC did not register this.
The +cose
suffix has been requested now, see email thread:
https://mailarchive.ietf.org/arch/msg/cose/Qb9W7ouloS__x7WyiN_AUsH4kXc/
If this registration proceeds, then we may change our media type to either one of
application/voucher+cose
application/voucher-cbor+cose
No input received from media-types WG, next step in process is to send the request to IANA per email. (Checking with mcr who will send the email and if not already sent.)
Discussion in media-types list was resolved (after filing an IANA request), conclusion is that we need to do the registration template inside a document - which should be this I-D I think. With that, the registration can be processed.
Because "COSE" already implies the payload is CBOR (wrapped inside the COSE in a single byte string) the media type can become application/voucher+cose
. The added -cbor
would be redundant in the name. The element voucher
on its own formally doesn't need a format designator, because only the following parts must be parsable in isolation:
+cose
and both of these are fully clear in their encoding and meaning. If the COSE would be stripped off, then it would require another media type like either application/cbor
or a more specific one (e.g. application/voucher-cbor
) but the latter would need to be defined in RFC8366-bis.
@thomas-fossati FYI I've now linked a PR to request the registration: https://github.com/anima-wg/constrained-voucher/pull/277
Alternative would be: application/voucher-cbor+cose
to signal that it is a Voucher in CBOR format, with a wrapping of COSE around it ("+cose"). Or should it be application/voucher-cose+cbor ?