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Re: [Cbor] A CBOR tag for alternatives/unions, request for comments

Carsten Bormann <cabo@tzi.org> Wed, 23 February 2022 14:48 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Wed, 23 Feb 2022 15:48:22 +0100
Cc: Michael Peyton Jones <michael.peyton-jones@iohk.io>, Duncan Coutts <duncan@well-typed.com>, cbor@ietf.org, Jared Corduan <jared.corduan@iohk.io>, Alexander Byaly <alexander.byaly@iohk.io>
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To: Emile Cormier <emile.cormier.jr@gmail.com>
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Subject: Re: [Cbor] A CBOR tag for alternatives/unions, request for comments
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On 2022-02-23, at 15:34, Emile Cormier <emile.cormier.jr@gmail.com> wrote:
> 
> Is there any consideration into how such tags and their associated datum be transcoded to JSON, without loss of information?

I’m not currently proposing to standardize this, but the cbor diagnostic tools support a transform to tunnel CBOR data items through JSON [0]:

$ echo "122(h'1234')" | diag2cbor.rb | cbor2json.rb -j
{
  "@@!t122": {
    "@@!b": "EjQ"
  }
}

This works by hijacking JSON object keys starting with @@!; I’m not sure the code handles all cases so we have achieved full transparency yet, but that is a SMOP [1].

Grüße, Carsten

[0]: https://github.com/cabo/cbor-diag/blob/master/lib/cbor-transform-j.rb
[1]: SMOP = Small matter of programming

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