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// Copyright (C) 2019-2021 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package abi
import (
"bytes"
"encoding/json"
"fmt"
"github.com/algorand/go-algorand/data/basics"
"math/big"
)
func castBigIntToNearestPrimitive(num *big.Int, bitSize uint16) (interface{}, error) {
if num.BitLen() > int(bitSize) {
return nil, fmt.Errorf("cast big int to nearest primitive failure: %v >= 2^%d", num, bitSize)
} else if num.Sign() < 0 {
return nil, fmt.Errorf("cannot cast big int to near primitive: %v < 0", num)
}
switch bitSize / 8 {
case 1:
return uint8(num.Uint64()), nil
case 2:
return uint16(num.Uint64()), nil
case 3, 4:
return uint32(num.Uint64()), nil
case 5, 6, 7, 8:
return num.Uint64(), nil
default:
return num, nil
}
}
// MarshalToJSON convert golang value to JSON format from ABI type
func (t Type) MarshalToJSON(value interface{}) ([]byte, error) {
switch t.abiTypeID {
case Uint:
bytesUint, err := encodeInt(value, t.bitSize)
if err != nil {
return nil, err
}
return new(big.Int).SetBytes(bytesUint).MarshalJSON()
case Ufixed:
denom := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(t.precision)), nil)
encodedUint, err := encodeInt(value, t.bitSize)
if err != nil {
return nil, err
}
return []byte(new(big.Rat).SetFrac(new(big.Int).SetBytes(encodedUint), denom).FloatString(int(t.precision))), nil
case Bool:
boolValue, ok := value.(bool)
if !ok {
return nil, fmt.Errorf("cannot infer to bool for marshal to JSON")
}
return json.Marshal(boolValue)
case Byte:
byteValue, ok := value.(byte)
if !ok {
return nil, fmt.Errorf("cannot infer to byte for marshal to JSON")
}
return json.Marshal(byteValue)
case Address:
var addressInternal basics.Address
switch valueCasted := value.(type) {
case []byte:
copy(addressInternal[:], valueCasted[:])
return json.Marshal(addressInternal.String())
case [addressByteSize]byte:
addressInternal = valueCasted
return json.Marshal(addressInternal.String())
default:
return nil, fmt.Errorf("cannot infer to byte slice/array for marshal to JSON")
}
case ArrayStatic, ArrayDynamic:
values, err := inferToSlice(value)
if err != nil {
return nil, err
}
if t.abiTypeID == ArrayStatic && int(t.staticLength) != len(values) {
return nil, fmt.Errorf("length of slice %d != type specific length %d", len(values), t.staticLength)
}
if t.childTypes[0].abiTypeID == Byte {
byteArr := make([]byte, len(values))
for i := 0; i < len(values); i++ {
tempByte, ok := values[i].(byte)
if !ok {
return nil, fmt.Errorf("cannot infer byte element from slice")
}
byteArr[i] = tempByte
}
return json.Marshal(byteArr)
}
rawMsgSlice := make([]json.RawMessage, len(values))
for i := 0; i < len(values); i++ {
rawMsgSlice[i], err = t.childTypes[0].MarshalToJSON(values[i])
if err != nil {
return nil, err
}
}
return json.Marshal(rawMsgSlice)
case String:
stringVal, ok := value.(string)
if !ok {
return nil, fmt.Errorf("cannot infer to string for marshal to JSON")
}
return json.Marshal(stringVal)
case Tuple:
values, err := inferToSlice(value)
if err != nil {
return nil, err
}
if len(values) != int(t.staticLength) {
return nil, fmt.Errorf("tuple element number != value slice length")
}
rawMsgSlice := make([]json.RawMessage, len(values))
for i := 0; i < len(values); i++ {
rawMsgSlice[i], err = t.childTypes[i].MarshalToJSON(values[i])
if err != nil {
return nil, err
}
}
return json.Marshal(rawMsgSlice)
default:
return nil, fmt.Errorf("cannot infer ABI type for marshalling value to JSON")
}
}
// UnmarshalFromJSON convert bytes to golang value following ABI type and encoding rules
func (t Type) UnmarshalFromJSON(jsonEncoded []byte) (interface{}, error) {
switch t.abiTypeID {
case Uint:
num := new(big.Int)
if err := num.UnmarshalJSON(jsonEncoded); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to uint: %v", string(jsonEncoded), err)
}
return castBigIntToNearestPrimitive(num, t.bitSize)
case Ufixed:
floatTemp := new(big.Rat)
if err := floatTemp.UnmarshalText(jsonEncoded); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to ufixed: %v", string(jsonEncoded), err)
}
denom := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(t.precision)), nil)
denomRat := new(big.Rat).SetInt(denom)
numeratorRat := new(big.Rat).Mul(denomRat, floatTemp)
if !numeratorRat.IsInt() {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to ufixed: precision out of range", string(jsonEncoded))
}
return castBigIntToNearestPrimitive(numeratorRat.Num(), t.bitSize)
case Bool:
var elem bool
if err := json.Unmarshal(jsonEncoded, &elem); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to bool: %v", string(jsonEncoded), err)
}
return elem, nil
case Byte:
var elem byte
if err := json.Unmarshal(jsonEncoded, &elem); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded to byte: %v", err)
}
return elem, nil
case Address:
var addrStr string
if err := json.Unmarshal(jsonEncoded, &addrStr); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded to string: %v", err)
}
addr, err := basics.UnmarshalChecksumAddress(addrStr)
if err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to address: %v", string(jsonEncoded), err)
}
return addr[:], nil
case ArrayStatic, ArrayDynamic:
if t.childTypes[0].abiTypeID == Byte && bytes.HasPrefix(jsonEncoded, []byte{'"'}) {
var byteArr []byte
err := json.Unmarshal(jsonEncoded, &byteArr)
if err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to bytes: %v", string(jsonEncoded), err)
}
if t.abiTypeID == ArrayStatic && len(byteArr) != int(t.staticLength) {
return nil, fmt.Errorf("length of slice %d != type specific length %d", len(byteArr), t.staticLength)
}
outInterface := make([]interface{}, len(byteArr))
for i := 0; i < len(byteArr); i++ {
outInterface[i] = byteArr[i]
}
return outInterface, nil
}
var elems []json.RawMessage
if err := json.Unmarshal(jsonEncoded, &elems); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to array: %v", string(jsonEncoded), err)
}
if t.abiTypeID == ArrayStatic && len(elems) != int(t.staticLength) {
return nil, fmt.Errorf("JSON array element number != ABI array elem number")
}
values := make([]interface{}, len(elems))
for i := 0; i < len(elems); i++ {
tempValue, err := t.childTypes[0].UnmarshalFromJSON(elems[i])
if err != nil {
return nil, err
}
values[i] = tempValue
}
return values, nil
case String:
stringEncoded := string(jsonEncoded)
if bytes.HasPrefix(jsonEncoded, []byte{'"'}) {
var stringVar string
if err := json.Unmarshal(jsonEncoded, &stringVar); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to string: %v", stringEncoded, err)
}
return stringVar, nil
} else if bytes.HasPrefix(jsonEncoded, []byte{'['}) {
var elems []byte
if err := json.Unmarshal(jsonEncoded, &elems); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to string: %v", stringEncoded, err)
}
return string(elems), nil
} else {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to string", stringEncoded)
}
case Tuple:
var elems []json.RawMessage
if err := json.Unmarshal(jsonEncoded, &elems); err != nil {
return nil, fmt.Errorf("cannot cast JSON encoded (%s) to array for tuple: %v", string(jsonEncoded), err)
}
if len(elems) != int(t.staticLength) {
return nil, fmt.Errorf("JSON array element number != ABI tuple elem number")
}
values := make([]interface{}, len(elems))
for i := 0; i < len(elems); i++ {
tempValue, err := t.childTypes[i].UnmarshalFromJSON(elems[i])
if err != nil {
return nil, err
}
values[i] = tempValue
}
return values, nil
default:
return nil, fmt.Errorf("cannot cast JSON encoded %s to ABI encoding stuff", string(jsonEncoded))
}
}
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