* Introduces `author_hasKey` and `author_hasSessionKeys` rpc endpoints
Both endpoints can be used to check if a key is present in the keystore.
- `hasKey` works on with an individual public key and key type. It
checks if a private key for the given combination exists in the
keystore.
- `hasSessionKeys` works with the full encoded session key blob stored
on-chain in `nextKeys`. This requires that the given blob can be decoded
by the runtime. It will return `true`, iff all public keys of the
session key exist in the storage.
Fixes: https://github.com/paritytech/substrate/issues/4696
* Update client/rpc-api/src/author/error.rs
Co-Authored-By: Nikolay Volf <nikvolf@gmail.com>
* Indentation
Co-authored-by: Nikolay Volf <nikvolf@gmail.com>
Bastian Köcher