3 files changed, 56 insertions, 20 deletions

diff --git a/rpc/api.go b/rpc/api.go
index aba47eee2..0f5bac657 100644
--- a/rpc/api.go
+++ b/rpc/api.go
@@ -159,10 +159,7 @@ func (api *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) err
 		if err := json.Unmarshal(req.Params, &args); err != nil {
 			return err
 		}
-		if err := args.requirements(); err != nil {
-			return err
-		}
-		*reply = api.xethAtStateNum(args.BlockNumber).CodeAt(args.Address)
+		*reply = api.xethAtStateNum(args.BlockNumber).CodeAt(args.Address.Hex())
 	case "eth_sendTransaction", "eth_transact":
 		args := new(NewTxArgs)
 		if err := json.Unmarshal(req.Params, &args); err != nil {
diff --git a/rpc/args.go b/rpc/args.go
index 30ed1a17c..2b62811e3 100644
--- a/rpc/args.go
+++ b/rpc/args.go
@@ -281,7 +281,7 @@ func (args *GetBalanceArgs) UnmarshalJSON(b []byte) (err error) {
 }
 
 type GetDataArgs struct {
-	Address     string
+	Address     common.Address
 	BlockNumber int64
 }
 
@@ -299,7 +299,7 @@ func (args *GetDataArgs) UnmarshalJSON(b []byte) (err error) {
 	if !ok {
 		return NewInvalidTypeError("address", "not a string")
 	}
-	args.Address = addstr
+	args.Address = common.HexToAddress(addstr)
 
 	if len(obj) > 1 {
 		if err := blockHeight(obj[1], &args.BlockNumber); err != nil {
@@ -310,13 +310,6 @@ func (args *GetDataArgs) UnmarshalJSON(b []byte) (err error) {
 	return nil
 }
 
-func (args *GetDataArgs) requirements() error {
-	if len(args.Address) == 0 {
-		return NewValidationError("Address", "cannot be blank")
-	}
-	return nil
-}
-
 type BlockNumIndexArgs struct {
 	BlockNumber int64
 	Index       int64
diff --git a/rpc/args_test.go b/rpc/args_test.go
index 7dec5d8f4..b8df08413 100644
--- a/rpc/args_test.go
+++ b/rpc/args_test.go
@@ -682,7 +682,7 @@ func TestGetTxCountBlockheightInvalid(t *testing.T) {
 func TestGetDataArgs(t *testing.T) {
 	input := `["0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8", "latest"]`
 	expected := new(GetDataArgs)
-	expected.Address = "0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8"
+	expected.Address = common.HexToAddress("0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8")
 	expected.BlockNumber = -1
 
 	args := new(GetDataArgs)
@@ -690,10 +690,6 @@ func TestGetDataArgs(t *testing.T) {
 		t.Error(err)
 	}
 
-	if err := args.requirements(); err != nil {
-		t.Error(err)
-	}
-
 	if expected.Address != args.Address {
 		t.Errorf("Address shoud be %#v but is %#v", expected.Address, args.Address)
 	}
@@ -703,13 +699,63 @@ func TestGetDataArgs(t *testing.T) {
 	}
 }
 
-func TestGetDataEmptyArgs(t *testing.T) {
+func TestGetDataArgsEmpty(t *testing.T) {
 	input := `[]`
 
 	args := new(GetDataArgs)
 	err := json.Unmarshal([]byte(input), &args)
-	if err == nil {
+	switch err.(type) {
+	case nil:
+		t.Error("Expected error but didn't get one")
+	case *InsufficientParamsError:
+		break
+	default:
+		t.Errorf("Expected *rpc.InsufficientParamsError but got %T with message `%s`", err, err.Error())
+	}
+}
+
+func TestGetDataArgsInvalid(t *testing.T) {
+	input := `{}`
+
+	args := new(GetDataArgs)
+	err := json.Unmarshal([]byte(input), &args)
+	switch err.(type) {
+	case nil:
+		t.Error("Expected error but didn't get one")
+	case *DecodeParamError:
+		break
+	default:
+		t.Errorf("Expected *rpc.DecodeParamError but got %T with message `%s`", err, err.Error())
+	}
+}
+
+func TestGetDataArgsAddressNotString(t *testing.T) {
+	input := `[12, "latest"]`
+
+	args := new(GetDataArgs)
+	err := json.Unmarshal([]byte(input), &args)
+	switch err.(type) {
+	case nil:
+		t.Error("Expected error but didn't get one")
+	case *InvalidTypeError:
+		break
+	default:
+		t.Errorf("Expected *rpc.InvalidTypeError but got %T with message `%s`", err, err.Error())
+	}
+}
+
+func TestGetDataArgsBlocknumberNotString(t *testing.T) {
+	input := `["0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8", false]`
+
+	args := new(GetDataArgs)
+	err := json.Unmarshal([]byte(input), &args)
+	switch err.(type) {
+	case nil:
 		t.Error("Expected error but didn't get one")
+	case *InvalidTypeError:
+		break
+	default:
+		t.Errorf("Expected *rpc.InvalidTypeError but got %T with message `%s`", err, err.Error())
 	}
 }