neoneo-go/pkg/smartcontract/parameter.go

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package smartcontract
import (
"bytes"
"encoding/base64"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"math/big"
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"os"
"strings"
"unicode/utf8"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// Parameter represents a smart contract parameter.
type Parameter struct {
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// Type of the parameter.
Type ParamType `json:"type"`
// The actual value of the parameter.
Value interface{} `json:"value"`
}
// ParameterPair represents a key-value pair, a slice of which is stored in
// MapType Parameter.
type ParameterPair struct {
Key Parameter `json:"key"`
Value Parameter `json:"value"`
}
// NewParameter returns a Parameter with a proper initialized Value
// of the given ParamType.
func NewParameter(t ParamType) Parameter {
return Parameter{
Type: t,
Value: nil,
}
}
type rawParameter struct {
Type ParamType `json:"type"`
Value json.RawMessage `json:"value,omitempty"`
}
// MarshalJSON implements the Marshaler interface.
func (p Parameter) MarshalJSON() ([]byte, error) {
var (
resultRawValue json.RawMessage
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resultErr error
)
if p.Value == nil {
if _, ok := validParamTypes[p.Type]; ok && p.Type != UnknownType {
return json.Marshal(rawParameter{Type: p.Type})
}
return nil, fmt.Errorf("can't marshal %s", p.Type)
}
switch p.Type {
case BoolType, StringType, Hash160Type, Hash256Type:
resultRawValue, resultErr = json.Marshal(p.Value)
case IntegerType:
val, ok := p.Value.(*big.Int)
if !ok {
resultErr = errors.New("invalid integer value")
break
}
resultRawValue = json.RawMessage(`"` + val.String() + `"`)
case PublicKeyType, ByteArrayType, SignatureType:
if p.Type == PublicKeyType {
resultRawValue, resultErr = json.Marshal(hex.EncodeToString(p.Value.([]byte)))
} else {
resultRawValue, resultErr = json.Marshal(base64.StdEncoding.EncodeToString(p.Value.([]byte)))
}
case ArrayType:
var value = p.Value.([]Parameter)
if value == nil {
resultRawValue, resultErr = json.Marshal([]Parameter{})
} else {
resultRawValue, resultErr = json.Marshal(value)
}
case MapType:
ppair := p.Value.([]ParameterPair)
resultRawValue, resultErr = json.Marshal(ppair)
case InteropInterfaceType, AnyType:
resultRawValue = nil
default:
resultErr = fmt.Errorf("can't marshal %s", p.Type)
}
if resultErr != nil {
return nil, resultErr
}
return json.Marshal(rawParameter{
Type: p.Type,
Value: resultRawValue,
})
}
// UnmarshalJSON implements the Unmarshaler interface.
func (p *Parameter) UnmarshalJSON(data []byte) (err error) {
var (
r rawParameter
i int64
s string
b []byte
boolean bool
)
if err = json.Unmarshal(data, &r); err != nil {
return
}
p.Type = r.Type
p.Value = nil
if len(r.Value) == 0 || bytes.Equal(r.Value, []byte("null")) {
return
}
switch r.Type {
case BoolType:
if err = json.Unmarshal(r.Value, &boolean); err != nil {
return
}
p.Value = boolean
case ByteArrayType, PublicKeyType, SignatureType:
if err = json.Unmarshal(r.Value, &s); err != nil {
return
}
if r.Type == PublicKeyType {
b, err = hex.DecodeString(s)
} else {
b, err = base64.StdEncoding.DecodeString(s)
}
if err != nil {
return
}
p.Value = b
case StringType:
if err = json.Unmarshal(r.Value, &s); err != nil {
return
}
p.Value = s
case IntegerType:
if err = json.Unmarshal(r.Value, &i); err == nil {
p.Value = big.NewInt(i)
return
}
// sometimes integer comes as string
if jErr := json.Unmarshal(r.Value, &s); jErr != nil {
return jErr
}
bi, ok := new(big.Int).SetString(s, 10)
if !ok {
// In this case previous err should mean string contains non-digit characters.
return err
}
err = stackitem.CheckIntegerSize(bi)
if err == nil {
p.Value = bi
}
case ArrayType:
// https://github.com/neo-project/neo/blob/3d59ecca5a8deb057bdad94b3028a6d5e25ac088/neo/Network/RPC/RpcServer.cs#L67
var rs []Parameter
if err = json.Unmarshal(r.Value, &rs); err != nil {
return
}
p.Value = rs
case MapType:
var ppair []ParameterPair
if err = json.Unmarshal(r.Value, &ppair); err != nil {
return
}
p.Value = ppair
case Hash160Type:
var h util.Uint160
if err = json.Unmarshal(r.Value, &h); err != nil {
return
}
p.Value = h
case Hash256Type:
var h util.Uint256
if err = json.Unmarshal(r.Value, &h); err != nil {
return
}
p.Value = h
case InteropInterfaceType, AnyType:
// stub, ignore value, it can only be null
p.Value = nil
default:
return fmt.Errorf("can't unmarshal %s", p.Type)
}
return
}
// NewParameterFromString returns a new Parameter initialized from the given
// string in neo-go-specific format. It is intended to be used in user-facing
// interfaces and has some heuristics in it to simplify parameter passing. The exact
// syntax is documented in the cli documentation.
func NewParameterFromString(in string) (*Parameter, error) {
var (
char rune
val string
err error
r *strings.Reader
buf strings.Builder
escaped bool
hadType bool
res = &Parameter{}
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typStr string
)
r = strings.NewReader(in)
for char, _, err = r.ReadRune(); err == nil && char != utf8.RuneError; char, _, err = r.ReadRune() {
if char == '\\' && !escaped {
escaped = true
continue
}
if char == ':' && !escaped && !hadType {
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typStr = buf.String()
res.Type, err = ParseParamType(typStr)
if err != nil {
return nil, err
}
// We currently do not support following types:
if res.Type == ArrayType || res.Type == MapType || res.Type == InteropInterfaceType || res.Type == VoidType {
return nil, fmt.Errorf("unsupported parameter type %s", res.Type)
}
buf.Reset()
hadType = true
continue
}
escaped = false
// We don't care about length and it never fails.
_, _ = buf.WriteRune(char)
}
if char == utf8.RuneError {
return nil, errors.New("bad UTF-8 string")
}
// The only other error `ReadRune` returns is io.EOF, which is fine and
// expected, so we don't check err here.
val = buf.String()
if !hadType {
res.Type = inferParamType(val)
}
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if res.Type == ByteArrayType && typStr == fileBytesParamType {
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res.Value, err = os.ReadFile(val)
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if err != nil {
return nil, fmt.Errorf("failed to read '%s' parameter from file '%s': %w", fileBytesParamType, val, err)
}
return res, nil
}
res.Value, err = adjustValToType(res.Type, val)
if err != nil {
return nil, err
}
return res, nil
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}
// NewParameterFromValue infers Parameter type from the value given and adjusts
// the value if needed. It does not copy the value if it can avoid doing so. All
// regular integers, util.*, keys.PublicKey*, string and bool types are supported,
// slice of byte slices is accepted and converted as well.
func NewParameterFromValue(value interface{}) (Parameter, error) {
var result = Parameter{
Value: value,
}
switch v := value.(type) {
case []byte:
result.Type = ByteArrayType
case string:
result.Type = StringType
case bool:
result.Type = BoolType
case *big.Int:
result.Type = IntegerType
case int8:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case byte:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case int16:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case uint16:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case int32:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case uint32:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case int:
result.Type = IntegerType
result.Value = big.NewInt(int64(v))
case uint:
result.Type = IntegerType
result.Value = new(big.Int).SetUint64(uint64(v))
case int64:
result.Type = IntegerType
result.Value = big.NewInt(v)
case uint64:
result.Type = IntegerType
result.Value = new(big.Int).SetUint64(v)
case *Parameter:
result = *v
case Parameter:
result = v
case util.Uint160:
result.Type = Hash160Type
case util.Uint256:
result.Type = Hash256Type
case *util.Uint160:
if v != nil {
return NewParameterFromValue(*v)
}
result.Type = AnyType
result.Value = nil
case *util.Uint256:
if v != nil {
return NewParameterFromValue(*v)
}
result.Type = AnyType
result.Value = nil
case keys.PublicKey:
return NewParameterFromValue(&v)
case *keys.PublicKey:
result.Type = PublicKeyType
result.Value = v.Bytes()
case [][]byte:
arr := make([]Parameter, 0, len(v))
for i := range v {
// We know the type exactly, so error is not possible.
elem, _ := NewParameterFromValue(v[i])
arr = append(arr, elem)
}
result.Type = ArrayType
result.Value = arr
case []Parameter:
arr := make([]Parameter, len(v))
copy(arr, v)
result.Type = ArrayType
result.Value = arr
case []*keys.PublicKey:
return NewParameterFromValue(keys.PublicKeys(v))
case keys.PublicKeys:
arr := make([]Parameter, 0, len(v))
for i := range v {
// We know the type exactly, so error is not possible.
elem, _ := NewParameterFromValue(v[i])
arr = append(arr, elem)
}
result.Type = ArrayType
result.Value = arr
case []interface{}:
arr, err := NewParametersFromValues(v...)
if err != nil {
return result, err
}
result.Type = ArrayType
result.Value = arr
default:
return result, fmt.Errorf("unsupported parameter %T", value)
}
return result, nil
}
// NewParametersFromValues is similar to NewParameterFromValue except that it
// works with multiple values and returns a simple slice of Parameter.
func NewParametersFromValues(values ...interface{}) ([]Parameter, error) {
res := make([]Parameter, 0, len(values))
for i := range values {
elem, err := NewParameterFromValue(values[i])
if err != nil {
return nil, err
}
res = append(res, elem)
}
return res, nil
}
// ExpandParameterToEmitable converts a parameter to a type which can be handled as
// an array item by emit.Array. It correlates with the way an RPC server handles
// FuncParams for invoke* calls inside the request.ExpandArrayIntoScript function.
func ExpandParameterToEmitable(param Parameter) (interface{}, error) {
var err error
switch t := param.Type; t {
case PublicKeyType:
return param.Value.(*keys.PublicKey).Bytes(), nil
case ArrayType:
arr := param.Value.([]Parameter)
res := make([]interface{}, len(arr))
for i := range arr {
res[i], err = ExpandParameterToEmitable(arr[i])
if err != nil {
return nil, err
}
}
return res, nil
case MapType, InteropInterfaceType, UnknownType, VoidType:
return nil, fmt.Errorf("unsupported parameter type: %s", t.String())
default:
return param.Value, nil
}
}