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abi.go
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abi.go
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package abi
import (
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"math/big"
"reflect"
"strconv"
"strings"
eABI "github.com/ethereum/go-ethereum/accounts/abi"
eCommon "github.com/ethereum/go-ethereum/common"
"github.com/irvin518/gotron-sdk/pkg/address"
"github.com/irvin518/gotron-sdk/pkg/proto/core"
"golang.org/x/crypto/sha3"
)
// Param list
type Param map[string]interface{}
// LoadFromJSON string into ABI data
func LoadFromJSON(jString string) ([]Param, error) {
if len(jString) == 0 {
return nil, nil
}
data := []Param{}
err := json.Unmarshal([]byte(jString), &data)
if err != nil {
return nil, err
}
return data, nil
}
// Signature of a method
func Signature(method string) []byte {
// hash method
hasher := sha3.NewLegacyKeccak256()
hasher.Write([]byte(method))
b := hasher.Sum(nil)
return b[:4]
}
func convetToAddress(v interface{}) (eCommon.Address, error) {
switch v.(type) {
case string:
addr, err := address.Base58ToAddress(v.(string))
if err != nil {
return eCommon.Address{}, fmt.Errorf("invalid address %s: %+v", v.(string), err)
}
return eCommon.BytesToAddress(addr.Bytes()[len(addr.Bytes())-20:]), nil
}
return eCommon.Address{}, fmt.Errorf("invalid address %v", v)
}
func convertToInt(ty eABI.Type, v interface{}) interface{} {
if ty.T == eABI.IntTy && ty.Size <= 64 {
tmp, _ := strconv.ParseInt(v.(string), 10, ty.Size)
switch ty.Size {
case 8:
v = int8(tmp)
case 16:
v = int16(tmp)
case 32:
v = int32(tmp)
case 64:
v = int64(tmp)
}
} else if ty.T == eABI.UintTy && ty.Size <= 64 {
tmp, _ := strconv.ParseUint(v.(string), 10, ty.Size)
switch ty.Size {
case 8:
v = uint8(tmp)
case 16:
v = uint16(tmp)
case 32:
v = uint32(tmp)
case 64:
v = uint64(tmp)
}
} else {
s := v.(string)
// check for hex char
if strings.HasPrefix(s, "0x") {
v, _ = new(big.Int).SetString(s[2:], 16)
} else {
v, _ = new(big.Int).SetString(s, 10)
}
}
return v
}
// GetPaddedParam from struct
func GetPaddedParam(param []Param) ([]byte, error) {
values := make([]interface{}, 0)
arguments := eABI.Arguments{}
for _, p := range param {
if len(p) != 1 {
return nil, fmt.Errorf("invalid param %+v", p)
}
for k, v := range p {
ty, err := eABI.NewType(k, "", nil)
if err != nil {
return nil, fmt.Errorf("invalid param %+v: %+v", p, err)
}
arguments = append(arguments,
eABI.Argument{
Name: "",
Type: ty,
Indexed: false,
},
)
if ty.T == eABI.SliceTy || ty.T == eABI.ArrayTy {
if ty.Elem.T == eABI.AddressTy {
tmp, ok := v.([]interface{})
if !ok {
return nil, fmt.Errorf("unable to convert array of addresses %+v", p)
}
v = make([]eCommon.Address, 0)
for i := range tmp {
addr, err := convetToAddress(tmp[i])
if err != nil {
return nil, err
}
v = append(v.([]eCommon.Address), addr)
}
}
if (ty.Elem.T == eABI.IntTy || ty.Elem.T == eABI.UintTy) &&
ty.Elem.Size > 64 {
tmp := make([]*big.Int, 0)
tmpSlice, ok := v.([]string)
if !ok {
return nil, fmt.Errorf("unable to convert array of unints %+v", p)
}
for i := range tmpSlice {
var value *big.Int
// check for hex char
if strings.HasPrefix(tmpSlice[i], "0x") {
value, _ = new(big.Int).SetString(tmpSlice[i][2:], 16)
} else {
value, _ = new(big.Int).SetString(tmpSlice[i], 10)
}
tmp = append(tmp, value)
}
v = tmp
}
}
if ty.T == eABI.AddressTy {
if v, err = convetToAddress(v); err != nil {
return nil, err
}
}
if (ty.T == eABI.IntTy || ty.T == eABI.UintTy) && reflect.TypeOf(v).Kind() == reflect.String {
v = convertToInt(ty, v)
}
if ty.T == eABI.BytesTy || ty.T == eABI.FixedBytesTy {
var err error
if v, err = convertToBytes(ty, v); err != nil {
return nil, err
}
}
values = append(values, v)
}
}
// convert params to bytes
return arguments.PackValues(values)
}
func convertToBytes(ty eABI.Type, v interface{}) (interface{}, error) {
// if string
if data, ok := v.(string); ok {
// convert from hex string
dataBytes, err := hex.DecodeString(data)
if err != nil {
// try with base64
dataBytes, err = base64.StdEncoding.DecodeString(data)
if err != nil {
return nil, err
}
}
// if array and size == 0
if ty.T == eABI.BytesTy || ty.Size == 0 {
return dataBytes, nil
}
if len(dataBytes) != ty.Size {
return nil, fmt.Errorf("invalid size: %d/%d", ty.Size, len(dataBytes))
}
switch ty.Size {
case 1:
value := [1]byte{}
copy(value[:], dataBytes[:1])
return value, nil
case 2:
value := [2]byte{}
copy(value[:], dataBytes[:2])
return value, nil
case 8:
value := [8]byte{}
copy(value[:], dataBytes[:8])
return value, nil
case 16:
value := [16]byte{}
copy(value[:], dataBytes[:16])
return value, nil
case 32:
value := [32]byte{}
copy(value[:], dataBytes[:32])
return value, nil
}
}
return v, nil
}
// Pack data into bytes
func Pack(method string, param []Param) ([]byte, error) {
signature := Signature(method)
pBytes, err := GetPaddedParam(param)
if err != nil {
return nil, err
}
signature = append(signature, pBytes...)
return signature, nil
}
// GetParser return output method parser arguments from ABI
func GetParser(ABI *core.SmartContract_ABI, method string) (eABI.Arguments, error) {
arguments := eABI.Arguments{}
for _, entry := range ABI.Entrys {
if entry.Name == method {
for _, out := range entry.Outputs {
ty, err := eABI.NewType(out.Type, "", nil)
if err != nil {
return nil, fmt.Errorf("invalid param %s: %+v", out.Type, err)
}
arguments = append(arguments, eABI.Argument{
Name: out.Name,
Type: ty,
Indexed: out.Indexed,
})
}
return arguments, nil
}
}
return nil, fmt.Errorf("not found")
}
// GetInputsParser returns input method parser arguments from ABI
func GetInputsParser(ABI *core.SmartContract_ABI, method string) (eABI.Arguments, error) {
arguments := eABI.Arguments{}
for _, entry := range ABI.Entrys {
if entry.Name == method {
for _, out := range entry.Inputs {
ty, err := eABI.NewType(out.Type, "", nil)
if err != nil {
return nil, fmt.Errorf("invalid param %s: %+v", out.Type, err)
}
arguments = append(arguments, eABI.Argument{
Name: out.Name,
Type: ty,
Indexed: out.Indexed,
})
}
return arguments, nil
}
}
return nil, fmt.Errorf("not found")
}