state_history_plugin: incorrect serialization of WA keys

[cc32d9]

as of release 2.0.5:

ship is using eosio::chain::shared_public_key for serializing key weight:

template <typename ST>
datastream<ST>& operator<<(datastream<ST>& ds, const history_serial_wrapper<eosio::chain::shared_key_weight>& obj) {
   fc::raw::pack(ds, as_type<eosio::chain::shared_public_key>(obj.obj.key));
   fc::raw::pack(ds, as_type<uint16_t>(obj.obj.weight));
   return ds;
}

But shared_public_key is defining its data as

using shared_public_key_data = fc::static_variant<fc::ecc::public_key_shim, fc::crypto::r1::public_key_shim, shared_string>;

so, in case of WA key, the FC serializer is packing it as a string. Then abieos is unable to deserialize it because it expects a variant.

The WA signatures seem to be safe, so it's only the authority objects affected.

[cc32d9]

not a variant, abieos is expecting a public key, but it gets the string length in its first byte. nevertheless, it's wrongly serialized.

[spoonincode]

Fix merged for 2.0.6 release thanks for report