// packElement packs the given reflect value according to the abi specification in
// t.
func packElement(t Type, reflectValue reflect.Value) []byte {
switch t.T {
case IntTy, UintTy:
return packNum(reflectValue)
case StringTy:
return packBytesSlice([]byte(reflectValue.String()), reflectValue.Len())
case AddressTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return common.LeftPadBytes(reflectValue.Bytes(), 32)
case BoolTy:
if reflectValue.Bool() {
return common.LeftPadBytes(common.Big1.Bytes(), 32)
} else {
return common.LeftPadBytes(common.Big0.Bytes(), 32)
}
case BytesTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return packBytesSlice(reflectValue.Bytes(), reflectValue.Len())
case FixedBytesTy:
if reflectValue.Kind() == reflect.Array {
reflectValue = mustArrayToByteSlice(reflectValue)
}
return common.RightPadBytes(reflectValue.Bytes(), 32)
}
panic("abi: fatal error")
}
func (self *Object) StorageString(str string) []byte {
if common.IsHex(str) {
return self.storage(common.Hex2Bytes(str[2:]))
} else {
return self.storage(common.RightPadBytes([]byte(str), 32))
}
}
func ecrecoverFunc(in []byte) []byte {
in = common.RightPadBytes(in, 128)
// "in" is (hash, v, r, s), each 32 bytes
// but for ecrecover we want (r, s, v)
r := common.BytesToBig(in[64:96])
s := common.BytesToBig(in[96:128])
// Treat V as a 256bit integer
vbig := common.Bytes2Big(in[32:64])
v := byte(vbig.Uint64())
if !crypto.ValidateSignatureValues(v, r, s) {
glog.V(logger.Debug).Infof("EC RECOVER FAIL: v, r or s value invalid")
return nil
}
// v needs to be at the end and normalized for libsecp256k1
vbignormal := new(big.Int).Sub(vbig, big.NewInt(27))
vnormal := byte(vbignormal.Uint64())
rsv := append(in[64:128], vnormal)
pubKey, err := crypto.Ecrecover(in[:32], rsv)
// make sure the public key is a valid one
if err != nil {
glog.V(logger.Error).Infof("EC RECOVER FAIL: ", err)
return nil
}
// the first byte of pubkey is bitcoin heritage
return common.LeftPadBytes(crypto.Sha3(pubKey[1:])[12:], 32)
}
func TestMultiReturnWithSlice(t *testing.T) {
const definition = `[
{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
// using buff to make the code readable
buff := new(bytes.Buffer)
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
stringOut := "hello"
buff.Write(common.RightPadBytes([]byte(stringOut), 32))
var inter []interface{}
err = abi.Unpack(&inter, "multi", buff.Bytes())
if err != nil {
t.Error(err)
}
if len(inter) != 2 {
t.Fatal("expected 2 results got", len(inter))
}
if num, ok := inter[0].(*big.Int); !ok || num.Cmp(big.NewInt(1)) != 0 {
t.Error("expected index 0 to be 1 got", num)
}
if str, ok := inter[1].(string); !ok || str != stringOut {
t.Error("expected index 1 to be", stringOut, "got", str)
}
}
// getData returns a slice from the data based on the start and size and pads
// up to size with zero's. This function is overflow safe.
func getData(data []byte, start, size *big.Int) []byte {
dlen := big.NewInt(int64(len(data)))
s := common.BigMin(start, dlen)
e := common.BigMin(new(big.Int).Add(s, size), dlen)
return common.RightPadBytes(data[s.Uint64():e.Uint64()], int(size.Uint64()))
}
func TestMultiReturnWithStruct(t *testing.T) {
const definition = `[
{ "name" : "multi", "constant" : false, "outputs": [ { "name": "Int", "type": "uint256" }, { "name": "String", "type": "string" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
// using buff to make the code readable
buff := new(bytes.Buffer)
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
stringOut := "hello"
buff.Write(common.RightPadBytes([]byte(stringOut), 32))
var inter struct {
Int *big.Int
String string
}
err = abi.Unpack(&inter, "multi", buff.Bytes())
if err != nil {
t.Error(err)
}
if inter.Int == nil || inter.Int.Cmp(big.NewInt(1)) != 0 {
t.Error("expected Int to be 1 got", inter.Int)
}
if inter.String != stringOut {
t.Error("expected String to be", stringOut, "got", inter.String)
}
var reversed struct {
String string
Int *big.Int
}
err = abi.Unpack(&reversed, "multi", buff.Bytes())
if err != nil {
t.Error(err)
}
if reversed.Int == nil || reversed.Int.Cmp(big.NewInt(1)) != 0 {
t.Error("expected Int to be 1 got", reversed.Int)
}
if reversed.String != stringOut {
t.Error("expected String to be", stringOut, "got", reversed.String)
}
}
// packBytesSlice packs the given bytes as [L, V] as the canonical representation
// bytes slice
func packBytesSlice(bytes []byte, l int) []byte {
len := packNum(reflect.ValueOf(l))
return append(len, common.RightPadBytes(bytes, (l+31)/32*32)...)
}
func TestUnmarshal(t *testing.T) {
const definition = `[
{ "name" : "int", "constant" : false, "outputs": [ { "type": "uint256" } ] },
{ "name" : "bool", "constant" : false, "outputs": [ { "type": "bool" } ] },
{ "name" : "bytes", "constant" : false, "outputs": [ { "type": "bytes" } ] },
{ "name" : "fixed", "constant" : false, "outputs": [ { "type": "bytes32" } ] },
{ "name" : "multi", "constant" : false, "outputs": [ { "type": "bytes" }, { "type": "bytes" } ] },
{ "name" : "addressSliceSingle", "constant" : false, "outputs": [ { "type": "address[]" } ] },
{ "name" : "addressSliceDouble", "constant" : false, "outputs": [ { "name": "a", "type": "address[]" }, { "name": "b", "type": "address[]" } ] },
{ "name" : "mixedBytes", "constant" : true, "outputs": [ { "name": "a", "type": "bytes" }, { "name": "b", "type": "bytes32" } ] }]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
buff := new(bytes.Buffer)
// marshal int
var Int *big.Int
err = abi.Unpack(&Int, "int", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
if err != nil {
t.Error(err)
}
if Int == nil || Int.Cmp(big.NewInt(1)) != 0 {
t.Error("expected Int to be 1 got", Int)
}
// marshal bool
var Bool bool
err = abi.Unpack(&Bool, "bool", common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001"))
if err != nil {
t.Error(err)
}
if !Bool {
t.Error("expected Bool to be true")
}
// marshal dynamic bytes max length 32
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
bytesOut := common.RightPadBytes([]byte("hello"), 32)
buff.Write(bytesOut)
var Bytes []byte
err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
if err != nil {
t.Error(err)
}
if !bytes.Equal(Bytes, bytesOut) {
t.Errorf("expected %x got %x", bytesOut, Bytes)
}
// marshall dynamic bytes max length 64
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
bytesOut = common.RightPadBytes([]byte("hello"), 64)
buff.Write(bytesOut)
err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
if err != nil {
t.Error(err)
}
if !bytes.Equal(Bytes, bytesOut) {
t.Errorf("expected %x got %x", bytesOut, Bytes)
}
// marshall dynamic bytes max length 63
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("000000000000000000000000000000000000000000000000000000000000003f"))
bytesOut = common.RightPadBytes([]byte("hello"), 63)
buff.Write(bytesOut)
err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
if err != nil {
t.Error(err)
}
if !bytes.Equal(Bytes, bytesOut) {
t.Errorf("expected %x got %x", bytesOut, Bytes)
}
// marshal dynamic bytes output empty
err = abi.Unpack(&Bytes, "bytes", nil)
if err == nil {
t.Error("expected error")
}
// marshal dynamic bytes length 5
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000005"))
buff.Write(common.RightPadBytes([]byte("hello"), 32))
err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
if err != nil {
t.Error(err)
}
if !bytes.Equal(Bytes, []byte("hello")) {
t.Errorf("expected %x got %x", bytesOut, Bytes)
}
// marshal dynamic bytes length 5
buff.Reset()
buff.Write(common.RightPadBytes([]byte("hello"), 32))
var hash common.Hash
err = abi.Unpack(&hash, "fixed", buff.Bytes())
if err != nil {
t.Error(err)
}
helloHash := common.BytesToHash(common.RightPadBytes([]byte("hello"), 32))
if hash != helloHash {
t.Errorf("Expected %x to equal %x", hash, helloHash)
}
// marshal error
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
err = abi.Unpack(&Bytes, "bytes", buff.Bytes())
if err == nil {
t.Error("expected error")
}
err = abi.Unpack(&Bytes, "multi", make([]byte, 64))
if err == nil {
t.Error("expected error")
}
// marshal mixed bytes
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040"))
fixed := common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")
buff.Write(fixed)
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020"))
bytesOut = common.RightPadBytes([]byte("hello"), 32)
buff.Write(bytesOut)
var out []interface{}
err = abi.Unpack(&out, "mixedBytes", buff.Bytes())
if err != nil {
t.Fatal("didn't expect error:", err)
}
if !bytes.Equal(bytesOut, out[0].([]byte)) {
t.Errorf("expected %x, got %x", bytesOut, out[0])
}
if !bytes.Equal(fixed, out[1].([]byte)) {
t.Errorf("expected %x, got %x", fixed, out[1])
}
// marshal address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000020")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000"))
var outAddr []common.Address
err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes())
if err != nil {
t.Fatal("didn't expect error:", err)
}
if len(outAddr) != 1 {
t.Fatal("expected 1 item, got", len(outAddr))
}
if outAddr[0] != (common.Address{1}) {
t.Errorf("expected %x, got %x", common.Address{1}, outAddr[0])
}
// marshal multiple address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000040")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000080")) // offset
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000001")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000100000000000000000000000000000000000000"))
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000002")) // size
buff.Write(common.Hex2Bytes("0000000000000000000000000200000000000000000000000000000000000000"))
buff.Write(common.Hex2Bytes("0000000000000000000000000300000000000000000000000000000000000000"))
var outAddrStruct struct {
A []common.Address
B []common.Address
}
err = abi.Unpack(&outAddrStruct, "addressSliceDouble", buff.Bytes())
if err != nil {
t.Fatal("didn't expect error:", err)
}
if len(outAddrStruct.A) != 1 {
t.Fatal("expected 1 item, got", len(outAddrStruct.A))
}
if outAddrStruct.A[0] != (common.Address{1}) {
t.Errorf("expected %x, got %x", common.Address{1}, outAddrStruct.A[0])
}
if len(outAddrStruct.B) != 2 {
t.Fatal("expected 1 item, got", len(outAddrStruct.B))
}
if outAddrStruct.B[0] != (common.Address{2}) {
t.Errorf("expected %x, got %x", common.Address{2}, outAddrStruct.B[0])
}
if outAddrStruct.B[1] != (common.Address{3}) {
t.Errorf("expected %x, got %x", common.Address{3}, outAddrStruct.B[1])
}
// marshal invalid address slice
buff.Reset()
buff.Write(common.Hex2Bytes("0000000000000000000000000000000000000000000000000000000000000100"))
err = abi.Unpack(&outAddr, "addressSliceSingle", buff.Bytes())
if err == nil {
t.Fatal("expected error:", err)
}
}
func TestInputVariableInputLength(t *testing.T) {
const definition = `[
{ "type" : "function", "name" : "strOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" } ] },
{ "type" : "function", "name" : "bytesOne", "constant" : true, "inputs" : [ { "name" : "str", "type" : "bytes" } ] },
{ "type" : "function", "name" : "strTwo", "constant" : true, "inputs" : [ { "name" : "str", "type" : "string" }, { "name" : "str1", "type" : "string" } ] }
]`
abi, err := JSON(strings.NewReader(definition))
if err != nil {
t.Fatal(err)
}
// test one string
strin := "hello world"
strpack, err := abi.Pack("strOne", strin)
if err != nil {
t.Error(err)
}
offset := make([]byte, 32)
offset[31] = 32
length := make([]byte, 32)
length[31] = byte(len(strin))
value := common.RightPadBytes([]byte(strin), 32)
exp := append(offset, append(length, value...)...)
// ignore first 4 bytes of the output. This is the function identifier
strpack = strpack[4:]
if !bytes.Equal(strpack, exp) {
t.Errorf("expected %x, got %x\n", exp, strpack)
}
// test one bytes
btspack, err := abi.Pack("bytesOne", []byte(strin))
if err != nil {
t.Error(err)
}
// ignore first 4 bytes of the output. This is the function identifier
btspack = btspack[4:]
if !bytes.Equal(btspack, exp) {
t.Errorf("expected %x, got %x\n", exp, btspack)
}
// test two strings
str1 := "hello"
str2 := "world"
str2pack, err := abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 := make([]byte, 32)
offset1[31] = 64
length1 := make([]byte, 32)
length1[31] = byte(len(str1))
value1 := common.RightPadBytes([]byte(str1), 32)
offset2 := make([]byte, 32)
offset2[31] = 128
length2 := make([]byte, 32)
length2[31] = byte(len(str2))
value2 := common.RightPadBytes([]byte(str2), 32)
exp2 := append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
// test two strings, first > 32, second < 32
str1 = strings.Repeat("a", 33)
str2pack, err = abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 = make([]byte, 32)
offset1[31] = 64
length1 = make([]byte, 32)
length1[31] = byte(len(str1))
value1 = common.RightPadBytes([]byte(str1), 64)
offset2[31] = 160
exp2 = append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
// test two strings, first > 32, second >32
str1 = strings.Repeat("a", 33)
str2 = strings.Repeat("a", 33)
str2pack, err = abi.Pack("strTwo", str1, str2)
if err != nil {
t.Error(err)
}
offset1 = make([]byte, 32)
offset1[31] = 64
length1 = make([]byte, 32)
length1[31] = byte(len(str1))
value1 = common.RightPadBytes([]byte(str1), 64)
offset2 = make([]byte, 32)
offset2[31] = 160
length2 = make([]byte, 32)
length2[31] = byte(len(str2))
value2 = common.RightPadBytes([]byte(str2), 64)
exp2 = append(offset1, offset2...)
exp2 = append(exp2, append(length1, value1...)...)
exp2 = append(exp2, append(length2, value2...)...)
// ignore first 4 bytes of the output. This is the function identifier
str2pack = str2pack[4:]
if !bytes.Equal(str2pack, exp2) {
t.Errorf("expected %x, got %x\n", exp, str2pack)
}
}
// quick helper padding
func pad(input []byte, size int, left bool) []byte {
if left {
return common.LeftPadBytes(input, size)
}
return common.RightPadBytes(input, size)
}
func (self *XEth) ToAscii(str string) string {
padded := common.RightPadBytes([]byte(str), 32)
return "0x" + common.ToHex(padded)
}