feat: create new grantee, if it doesn't exist

simapp/app.go

@@ -285,7 +285,7 @@ func NewSimApp(
 		stakingtypes.NewMultiStakingHooks(app.DistrKeeper.Hooks(), app.SlashingKeeper.Hooks()),
 	)
 
-	app.AuthzKeeper = authzkeeper.NewKeeper(keys[authzkeeper.StoreKey], appCodec, app.msgSvcRouter)
+	app.AuthzKeeper = authzkeeper.NewKeeper(keys[authzkeeper.StoreKey], appCodec, app.msgSvcRouter, app.AccountKeeper)
 
 	// register the proposal types
 	govRouter := govtypes.NewRouter()

x/authz/keeper/keeper.go

@@ -13,22 +13,25 @@ import (
 	storetypes "github.com/cosmos/cosmos-sdk/store/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+	authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
 	"github.com/cosmos/cosmos-sdk/x/auth/middleware"
 	"github.com/cosmos/cosmos-sdk/x/authz"
 )
 
 type Keeper struct {
-	storeKey storetypes.StoreKey
-	cdc      codec.BinaryCodec
-	router   *middleware.MsgServiceRouter
+	storeKey   storetypes.StoreKey
+	cdc        codec.BinaryCodec
+	router     *middleware.MsgServiceRouter
+	authKeeper authkeeper.AccountKeeper
 }
 
 // NewKeeper constructs a message authorization Keeper
-func NewKeeper(storeKey storetypes.StoreKey, cdc codec.BinaryCodec, router *middleware.MsgServiceRouter) Keeper {
+func NewKeeper(storeKey storetypes.StoreKey, cdc codec.BinaryCodec, router *middleware.MsgServiceRouter, ak authkeeper.AccountKeeper) Keeper {
 	return Keeper{
-		storeKey: storeKey,
-		cdc:      cdc,
-		router:   router,
+		storeKey:   storeKey,
+		cdc:        cdc,
+		router:     router,
+		authKeeper: ak,
 	}
 }
 

x/authz/keeper/msg_server.go

@@ -17,6 +17,13 @@ func (k Keeper) Grant(goCtx context.Context, msg *authz.MsgGrant) (*authz.MsgGra
 	if err != nil {
 		return nil, err
 	}
+	// create the account if it is not in account state
+	granteeAcc := k.authKeeper.GetAccount(ctx, grantee)
+	if granteeAcc == nil {
+		granteeAcc = k.authKeeper.NewAccountWithAddress(ctx, grantee)
+		k.authKeeper.SetAccount(ctx, granteeAcc)
+	}
+
 	granter, err := sdk.AccAddressFromBech32(msg.Granter)
 	if err != nil {
 		return nil, err