feat: implementing SubmitTx gRPC endpoint (#2147)

* feat: implementing SubmitTx gRPC endpoint

* test: adding failure cases

* add capability test

* chore: comment

* chore: cleanup

* chore: changelog

* import & sequence

* nits

* refactor: clean up tests

CHANGELOG.md

@@ -97,6 +97,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* (apps/27-interchain-accounts) [\#2147](https://github.com/cosmos/ibc-go/pull/2147) Adding a `SubmitTx` gRPC endpoint for the ICS27 Controller module which allows owners of interchain accounts to submit transactions. This replaces the previously existing need for authentication modules to implement this standard functionality.
+
 ### Bug Fixes
 
 * (makefile) [\#1785](https://github.com/cosmos/ibc-go/pull/1785) Fetch the correct versions of protocol buffers dependencies from tendermint, cosmos-sdk, and ics23.

modules/apps/27-interchain-accounts/controller/keeper/msg_server.go

@@ -4,9 +4,12 @@ import (
 	"context"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 
 	"github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
 	icatypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/types"
+	channeltypes "github.com/cosmos/ibc-go/v5/modules/core/04-channel/types"
+	host "github.com/cosmos/ibc-go/v5/modules/core/24-host"
 )
 
 var _ types.MsgServer = Keeper{}
@@ -32,5 +35,27 @@ func (k Keeper) RegisterAccount(goCtx context.Context, msg *types.MsgRegisterAcc
 
 // SubmitTx defines a rpc handler for MsgSubmitTx
 func (k Keeper) SubmitTx(goCtx context.Context, msg *types.MsgSubmitTx) (*types.MsgSubmitTxResponse, error) {
-	return &types.MsgSubmitTxResponse{}, nil
+	ctx := sdk.UnwrapSDKContext(goCtx)
+
+	portID, err := icatypes.NewControllerPortID(msg.Owner)
+	if err != nil {
+		return nil, err
+	}
+
+	channelID, found := k.GetActiveChannelID(ctx, msg.ConnectionId, portID)
+	if !found {
+		return nil, sdkerrors.Wrapf(icatypes.ErrActiveChannelNotFound, "failed to retrieve active channel for port %s", portID)
+	}
+
+	chanCap, found := k.scopedKeeper.GetCapability(ctx, host.ChannelCapabilityPath(portID, channelID))
+	if !found {
+		return nil, sdkerrors.Wrap(channeltypes.ErrChannelCapabilityNotFound, "module does not own channel capability")
+	}
+
+	seq, err := k.SendTx(ctx, chanCap, msg.ConnectionId, portID, msg.PacketData, msg.TimeoutTimestamp)
+	if err != nil {
+		return nil, err
+	}
+
+	return &types.MsgSubmitTxResponse{Sequence: seq}, nil
 }

modules/apps/27-interchain-accounts/controller/keeper/msg_server_test.go

@@ -1,17 +1,24 @@
 package keeper_test
 
 import (
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdktypes "github.com/cosmos/cosmos-sdk/types"
+	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 
-	icatypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
+	"github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
+	controllertypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/controller/types"
+	icatypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/types"
+	clienttypes "github.com/cosmos/ibc-go/v5/modules/core/02-client/types"
 	channeltypes "github.com/cosmos/ibc-go/v5/modules/core/04-channel/types"
 	host "github.com/cosmos/ibc-go/v5/modules/core/24-host"
 	ibctesting "github.com/cosmos/ibc-go/v5/testing"
 )
 
 func (suite *KeeperTestSuite) TestRegisterAccount() {
 	var (
-		msg               *icatypes.MsgRegisterAccount
+		msg               *controllertypes.MsgRegisterAccount
 		expectedChannelID = "channel-0"
 	)
 
@@ -63,7 +70,7 @@ func (suite *KeeperTestSuite) TestRegisterAccount() {
 		path := NewICAPath(suite.chainA, suite.chainB)
 		suite.coordinator.SetupConnections(path)
 
-		msg = icatypes.NewMsgRegisterAccount(ibctesting.FirstConnectionID, ibctesting.TestAccAddress, "")
+		msg = controllertypes.NewMsgRegisterAccount(ibctesting.FirstConnectionID, ibctesting.TestAccAddress, "")
 
 		tc.malleate()
 
@@ -85,3 +92,106 @@ func (suite *KeeperTestSuite) TestRegisterAccount() {
 		}
 	}
 }
+
+func (suite *KeeperTestSuite) TestSubmitTx() {
+	var (
+		path *ibctesting.Path
+		msg  *controllertypes.MsgSubmitTx
+	)
+
+	testCases := []struct {
+		name     string
+		malleate func()
+		expPass  bool
+	}{
+		{
+			"success", func() {
+			},
+			true,
+		},
+		{
+			"failure - owner address is empty", func() {
+				msg.Owner = ""
+			},
+			false,
+		},
+		{
+			"failure - active channel does not exist for connection ID", func() {
+				msg.Owner = TestOwnerAddress
+				msg.ConnectionId = "connection-100"
+			},
+			false,
+		},
+		{
+			"failure - active channel does not exist for port ID", func() {
+				msg.Owner = TestAccAddress.String()
+			},
+			false,
+		},
+		{
+			"failure - controller module does not own capability for this channel", func() {
+				msg.Owner = TestAccAddress.String()
+				portID, err := icatypes.NewControllerPortID(msg.Owner)
+				suite.Require().NoError(err)
+
+				// set the active channel with the incorrect portID in order to reach the capability check
+				suite.chainA.GetSimApp().ICAControllerKeeper.SetActiveChannelID(suite.chainA.GetContext(), path.EndpointA.ConnectionID, portID, path.EndpointA.ChannelID)
+			},
+			false,
+		},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+
+		suite.Run(tc.name, func() {
+			suite.SetupTest()
+
+			owner := TestOwnerAddress
+			path = NewICAPath(suite.chainA, suite.chainB)
+			suite.coordinator.SetupConnections(path)
+
+			err := SetupICAPath(path, owner)
+			suite.Require().NoError(err)
+
+			portID, err := icatypes.NewControllerPortID(TestOwnerAddress)
+			suite.Require().NoError(err)
+
+			// get the address of the interchain account stored in state during handshake step
+			interchainAccountAddr, found := suite.chainA.GetSimApp().ICAControllerKeeper.GetInterchainAccountAddress(suite.chainA.GetContext(), path.EndpointA.ConnectionID, portID)
+			suite.Require().True(found)
+
+			// create bank transfer message that will execute on the host chain
+			icaMsg := &banktypes.MsgSend{
+				FromAddress: interchainAccountAddr,
+				ToAddress:   suite.chainB.SenderAccount.GetAddress().String(),
+				Amount:      sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100))),
+			}
+
+			data, err := icatypes.SerializeCosmosTx(suite.chainA.Codec, []sdk.Msg{icaMsg})
+			suite.Require().NoError(err)
+
+			packetData := icatypes.InterchainAccountPacketData{
+				Type: icatypes.EXECUTE_TX,
+				Data: data,
+				Memo: "memo",
+			}
+
+			timeoutTimestamp := uint64(suite.chainA.GetContext().BlockTime().Add(time.Minute).UnixNano())
+			connectionID := path.EndpointA.ConnectionID
+
+			msg = types.NewMsgSubmitTx(owner, connectionID, clienttypes.ZeroHeight(), timeoutTimestamp, packetData)
+
+			tc.malleate() // malleate mutates test data
+			res, err := suite.chainA.GetSimApp().ICAControllerKeeper.SubmitTx(sdk.WrapSDKContext(suite.chainA.GetContext()), msg)
+
+			if tc.expPass {
+				suite.Require().NoError(err)
+				suite.Require().NotNil(res)
+			} else {
+				suite.Require().Error(err)
+				suite.Require().Nil(res)
+			}
+		})
+	}
+}