Schema Creation should Reject `SignatureRequired` for OnChain and IPFS Payload Locations

[wilwade]

Currently it is possible to create a schema with the setting SignatureRequired when also using the PayloadLocation of OnChain or IPFS.

Expected: Schema creation and proposal for creation should reject a schema setting that does not apply to the selected PayloadLocation

As a developer creating a schema (or someone reading a schema), I want to make sure that I do not incorrectly think that the SignatureRequired will do something for Message Storage based schemas, when it does not.

[JoeCap08055]

Would there be any benefit to adding support for SignatureRequired to other pallets besides StatefulStorage?

[wilwade]

Would there be any benefit to adding support for SignatureRequired to other pallets besides StatefulStorage?

IPFS doesn't have a delegation option, as it assumes the off-chain data handles any delegation interaction.

I think there might be for OnChain, but no clear use case at this point in time.

[JoeCap08055]

I also think that for schemas with SignatureRequired, we should explicitly reject any delegation requests for that schema.

[wilwade]

I also think that for schemas with SignatureRequired, we should explicitly reject any delegation requests for that schema.

Hmm... That sounds good, but it requires a load of a lot of data when doing a delegation to check for that flag on schemas. Open to ideas of how to do it for opening a separate issue however.