🐞 Bug: HTTP API returns "Internal Server Error" when attempting to encrypt multiple transaction metadata messages. about cardano-wallet

[jonathanknowles]

The cause of the internal server error is this section of code:

cardano-wallet/lib/api/src/Cardano/Wallet/Api/Http/Shelley/Server.hs

Lines 3202 to 3207 in a2cac93

	parseMessage = \case
	TxMetaMap kvs ->
	case mapMaybe getValue kvs of
	[ ] -> Nothing
	[v] -> Just v
	_vs -> error "only one 'msg' field expected"

The error branch will only be evaluated if the TxMetadataDetailedSchema JSON serialisation option is used in conjunction with a TxMetaMap object that contains multiple msg keys.

If instead the TxMetadataNoSchema JSON serialisation option is used, then only the last msg key-value mapping will be retained, and the error branch will not be evaluated.

See #4647 (comment) for an explanation of why this happens.

[paweljakubas]

addressed and fixed #4651