chore: Handle FinalityProviderSigningInfo object (#194)

## Summary

Part closes: babylonlabs-io/pm#72

Currently some of the objects in the babylon apis are exposed and need
to be handled correctly seen in
[here](babylonlabs-io/pm#72)

This PR handles the `FinalityProviderSigningInfo` in
https://github.com/babylonlabs-io/babylon/blob/v0.11.0/x/finality/keeper/grpc_query.go#L230

CHANGELOG.md

@@ -37,6 +37,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## Unreleased
 
+### API Breaking
+
+* [#194](https://github.com/babylonlabs-io/babylon/pull/194) Adjusted handling of `FinalityProviderSigningInfo` in finality keeper queries to improve API security
+  * Modified `QuerySigningInfosResponse` to remove direct exposure of sensitive fields
+  * Updated related tests in `x/finality/keeper/grpc_query_test.go`
+
 ### State Machine Breaking
 
 * [#181](https://github.com/babylonlabs-io/babylon/pull/181) Modify BTC heights

proto/babylon/finality/v1/query.proto

@@ -6,6 +6,8 @@ import "google/api/annotations.proto";
 import "cosmos/base/query/v1beta1/pagination.proto";
 import "babylon/finality/v1/params.proto";
 import "babylon/finality/v1/finality.proto";
+import "google/protobuf/timestamp.proto";
+import "amino/amino.proto";
 
 option go_package = "github.com/babylonlabs-io/babylon/x/finality/types";
 
@@ -229,11 +231,24 @@ message QuerySigningInfoRequest {
   string fp_btc_pk_hex = 1;
 }
 
+// SigningInfoResponse defines the API response containing a finality provider's signing info
+// for monitoring their liveness activity.
+message SigningInfoResponse {
+  // fp_btc_pk is the BTC PK of the finality provider that casts this vote
+  string fp_btc_pk_hex = 1;
+  // start_height is the block height at which finality provider become active
+  int64 start_height = 2;
+  // missed_blocks_counter defines a counter to avoid unnecessary array reads.
+  // Note that `Sum(MissedBlocksBitArray)` always equals `MissedBlocksCounter`.
+  int64 missed_blocks_counter = 3;
+   // Timestamp until which the validator is jailed due to liveness downtime.
+  google.protobuf.Timestamp jailed_until = 4 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false, (amino.dont_omitempty) = true];
+}
+
 // QuerySigningInfoResponse is the response type for the Query/SigningInfo RPC
 // method
 message QuerySigningInfoResponse {
-  // fp_signing_info is the signing info of requested finality provider BTC public key
-  FinalityProviderSigningInfo fp_signing_info = 1 [(gogoproto.nullable) = false];
+  SigningInfoResponse signing_info = 1 [(gogoproto.nullable) = false];
 }
 
 // QuerySigningInfosRequest is the request type for the Query/SigningInfos RPC
@@ -246,6 +261,6 @@ message QuerySigningInfosRequest {
 // method
 message QuerySigningInfosResponse {
   // info is the signing info of all finality providers with signing info
-  repeated FinalityProviderSigningInfo fp_signing_infos = 1 [(gogoproto.nullable) = false];
+  repeated SigningInfoResponse signing_infos = 1 [(gogoproto.nullable) = false];
   cosmos.base.query.v1beta1.PageResponse pagination = 2;
 }

x/finality/keeper/grpc_query.go

@@ -246,7 +246,7 @@ func (k Keeper) SigningInfo(ctx context.Context, req *types.QuerySigningInfoRequ
 		return nil, status.Errorf(codes.NotFound, "SigningInfo not found for the finality provider %s", req.FpBtcPkHex)
 	}
 
-	return &types.QuerySigningInfoResponse{FpSigningInfo: signingInfo}, nil
+	return &types.QuerySigningInfoResponse{SigningInfo: convertToSigningInfoResponse(signingInfo)}, nil
 }
 
 // SigningInfos returns signing-infos of all finality providers.
@@ -271,5 +271,22 @@ func (k Keeper) SigningInfos(ctx context.Context, req *types.QuerySigningInfosRe
 	if err != nil {
 		return nil, err
 	}
-	return &types.QuerySigningInfosResponse{FpSigningInfos: signInfos, Pagination: pageRes}, nil
+	return &types.QuerySigningInfosResponse{SigningInfos: convertToSigningInfosResponse(signInfos), Pagination: pageRes}, nil
+}
+
+func convertToSigningInfoResponse(info types.FinalityProviderSigningInfo) types.SigningInfoResponse {
+	return types.SigningInfoResponse{
+		FpBtcPkHex:          info.FpBtcPk.MarshalHex(),
+		StartHeight:         info.StartHeight,
+		MissedBlocksCounter: info.MissedBlocksCounter,
+		JailedUntil:         info.JailedUntil,
+	}
+}
+
+func convertToSigningInfosResponse(signInfos []types.FinalityProviderSigningInfo) []types.SigningInfoResponse {
+	response := make([]types.SigningInfoResponse, len(signInfos))
+	for i, info := range signInfos {
+		response[i] = convertToSigningInfoResponse(info)
+	}
+	return response
 }

x/finality/keeper/grpc_query_test.go

@@ -405,9 +405,9 @@ func FuzzSigningInfo(f *testing.F) {
 			req := &types.QuerySigningInfoRequest{FpBtcPkHex: fpPk}
 			resp, err := fKeeper.SigningInfo(ctx, req)
 			require.NoError(t, err)
-			require.Equal(t, fpSigningInfos[fpPk].StartHeight, resp.FpSigningInfo.StartHeight)
-			require.Equal(t, fpSigningInfos[fpPk].MissedBlocksCounter, resp.FpSigningInfo.MissedBlocksCounter)
-			require.Equal(t, fpPk, resp.FpSigningInfo.FpBtcPk.MarshalHex())
+			require.Equal(t, fpSigningInfos[fpPk].StartHeight, resp.SigningInfo.StartHeight)
+			require.Equal(t, fpSigningInfos[fpPk].MissedBlocksCounter, resp.SigningInfo.MissedBlocksCounter)
+			require.Equal(t, fpPk, resp.SigningInfo.FpBtcPkHex)
 		}
 
 		// perform a query for signing info of non-exist finality provider
@@ -428,12 +428,11 @@ func FuzzSigningInfo(f *testing.F) {
 		}
 		resp, err := fKeeper.SigningInfos(ctx, req)
 		require.NoError(t, err)
-		require.LessOrEqual(t, len(resp.FpSigningInfos), int(limit))  // check if pagination takes effect
+		require.LessOrEqual(t, len(resp.SigningInfos), int(limit))    // check if pagination takes effect
 		require.EqualValues(t, resp.Pagination.Total, numSigningInfo) // ensure evidences before startHeight are not included
-		for _, si := range resp.FpSigningInfos {
-			require.Equal(t, fpSigningInfos[si.FpBtcPk.MarshalHex()].MissedBlocksCounter, si.MissedBlocksCounter)
-			require.Equal(t, fpSigningInfos[si.FpBtcPk.MarshalHex()].FpBtcPk.MarshalHex(), si.FpBtcPk.MarshalHex())
-			require.Equal(t, fpSigningInfos[si.FpBtcPk.MarshalHex()].StartHeight, si.StartHeight)
+		for _, si := range resp.SigningInfos {
+			require.Equal(t, fpSigningInfos[si.FpBtcPkHex].MissedBlocksCounter, si.MissedBlocksCounter)
+			require.Equal(t, fpSigningInfos[si.FpBtcPkHex].StartHeight, si.StartHeight)
 		}
 	})
 }