encode paseto payloads as json

[conradludgate]

I realised yesterday that PASETO payloads need to be encoded with JSON. If we want to support decrypting on non-rust platforms, we should be spec compliant for PASETO to make it easier.

https://github.com/paseto-standard/paseto-spec/blob/master/docs/02-Implementation-Guide/01-Payload-Processing.md#payload-processing

All PASETO payloads must be a JSON-encoded object represented as a UTF-8 encoded string. The topmost JSON object should be an object, map, or associative array (select appropriate for your language), not a flat array or list.

Unfortunately, rusty-paseto doesn't enforce this behaviour, so I only noticed now :(

2 solutions:

1. Hacky (this one)

Just wrap the messagepack blob in base64 and then stuff it in a json object.

2. Might be slightly better

Don't use messagepack at all, use only JSON.

Meh 🤷

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