436 lines
10 KiB
Go
436 lines
10 KiB
Go
package smartcontract
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import (
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"encoding/base64"
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"math"
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"math/bits"
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"strconv"
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"strings"
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"unicode/utf8"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/pkg/errors"
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)
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// PropertyState represents contract properties (flags).
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type PropertyState byte
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// List of supported properties.
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const (
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HasStorage PropertyState = 1 << iota
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IsPayable PropertyState = 1 << 2
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NoProperties = 0
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)
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// Parameter represents a smart contract parameter.
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type Parameter struct {
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// Type of the parameter.
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Type ParamType `json:"type"`
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// The actual value of the parameter.
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Value interface{} `json:"value"`
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}
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// ParameterPair represents key-value pair, a slice of which is stored in
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// MapType Parameter.
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type ParameterPair struct {
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Key Parameter `json:"key"`
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Value Parameter `json:"value"`
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}
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// NewParameter returns a Parameter with proper initialized Value
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// of the given ParamType.
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func NewParameter(t ParamType) Parameter {
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return Parameter{
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Type: t,
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Value: nil,
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}
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}
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type rawParameter struct {
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Type ParamType `json:"type"`
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Value json.RawMessage `json:"value"`
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}
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// MarshalJSON implements Marshaler interface.
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func (p *Parameter) MarshalJSON() ([]byte, error) {
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var (
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resultRawValue json.RawMessage
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resultErr error
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)
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switch p.Type {
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case BoolType, StringType, Hash160Type, Hash256Type:
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resultRawValue, resultErr = json.Marshal(p.Value)
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case IntegerType:
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val, ok := p.Value.(int64)
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if !ok {
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resultErr = errors.New("invalid integer value")
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break
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}
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valStr := strconv.FormatInt(val, 10)
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resultRawValue = json.RawMessage(`"` + valStr + `"`)
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case PublicKeyType, ByteArrayType, SignatureType:
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if p.Value == nil {
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resultRawValue = []byte("null")
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} else if p.Type == PublicKeyType {
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resultRawValue, resultErr = json.Marshal(hex.EncodeToString(p.Value.([]byte)))
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} else {
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resultRawValue, resultErr = json.Marshal(base64.StdEncoding.EncodeToString(p.Value.([]byte)))
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}
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case ArrayType:
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var value = p.Value.([]Parameter)
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resultRawValue, resultErr = json.Marshal(value)
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case MapType:
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ppair := p.Value.([]ParameterPair)
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resultRawValue, resultErr = json.Marshal(ppair)
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case InteropInterfaceType, AnyType:
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resultRawValue = []byte("null")
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default:
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resultErr = errors.Errorf("Marshaller for type %s not implemented", p.Type)
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}
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if resultErr != nil {
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return nil, resultErr
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}
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return json.Marshal(rawParameter{
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Type: p.Type,
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Value: resultRawValue,
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})
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}
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// UnmarshalJSON implements Unmarshaler interface.
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func (p *Parameter) UnmarshalJSON(data []byte) (err error) {
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var (
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r rawParameter
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i int64
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s string
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b []byte
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boolean bool
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)
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if err = json.Unmarshal(data, &r); err != nil {
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return
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}
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switch p.Type = r.Type; r.Type {
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case BoolType:
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if err = json.Unmarshal(r.Value, &boolean); err != nil {
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return
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}
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p.Value = boolean
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case ByteArrayType, PublicKeyType, SignatureType:
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if err = json.Unmarshal(r.Value, &s); err != nil {
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return
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}
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if r.Type == PublicKeyType {
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b, err = hex.DecodeString(s)
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} else {
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b, err = base64.StdEncoding.DecodeString(s)
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}
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if err != nil {
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return
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}
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p.Value = b
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case StringType:
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if err = json.Unmarshal(r.Value, &s); err != nil {
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return
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}
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p.Value = s
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case IntegerType:
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if err = json.Unmarshal(r.Value, &i); err == nil {
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p.Value = i
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return
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}
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// sometimes integer comes as string
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if err = json.Unmarshal(r.Value, &s); err != nil {
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return
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}
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if i, err = strconv.ParseInt(s, 10, 64); err != nil {
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return
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}
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p.Value = i
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case ArrayType:
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// https://github.com/neo-project/neo/blob/3d59ecca5a8deb057bdad94b3028a6d5e25ac088/neo/Network/RPC/RpcServer.cs#L67
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var rs []Parameter
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if err = json.Unmarshal(r.Value, &rs); err != nil {
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return
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}
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p.Value = rs
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case MapType:
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var ppair []ParameterPair
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if err = json.Unmarshal(r.Value, &ppair); err != nil {
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return
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}
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p.Value = ppair
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case Hash160Type:
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var h util.Uint160
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if err = json.Unmarshal(r.Value, &h); err != nil {
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return
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}
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p.Value = h
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case Hash256Type:
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var h util.Uint256
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if err = json.Unmarshal(r.Value, &h); err != nil {
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return
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}
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p.Value = h
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case InteropInterfaceType, AnyType:
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// stub, ignore value, it can only be null
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p.Value = nil
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default:
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return errors.Errorf("Unmarshaller for type %s not implemented", p.Type)
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}
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return
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}
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// EncodeBinary implements io.Serializable interface.
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func (p *Parameter) EncodeBinary(w *io.BinWriter) {
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w.WriteB(byte(p.Type))
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switch p.Type {
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case BoolType:
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w.WriteBool(p.Value.(bool))
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case ByteArrayType, PublicKeyType, SignatureType:
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if p.Value == nil {
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w.WriteVarUint(math.MaxUint64)
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} else {
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w.WriteVarBytes(p.Value.([]byte))
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}
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case StringType:
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w.WriteString(p.Value.(string))
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case IntegerType:
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w.WriteU64LE(uint64(p.Value.(int64)))
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case ArrayType:
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w.WriteArray(p.Value.([]Parameter))
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case MapType:
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w.WriteArray(p.Value.([]ParameterPair))
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case Hash160Type:
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w.WriteBytes(p.Value.(util.Uint160).BytesBE())
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case Hash256Type:
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w.WriteBytes(p.Value.(util.Uint256).BytesBE())
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case InteropInterfaceType:
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default:
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w.Err = fmt.Errorf("unknown type: %x", p.Type)
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}
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}
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// DecodeBinary implements io.Serializable interface.
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func (p *Parameter) DecodeBinary(r *io.BinReader) {
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p.Type = ParamType(r.ReadB())
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switch p.Type {
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case BoolType:
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p.Value = r.ReadBool()
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case ByteArrayType, PublicKeyType, SignatureType:
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ln := r.ReadVarUint()
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if ln != math.MaxUint64 {
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b := make([]byte, ln)
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r.ReadBytes(b)
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p.Value = b
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}
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case StringType:
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p.Value = r.ReadString()
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case IntegerType:
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p.Value = int64(r.ReadU64LE())
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case ArrayType:
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ps := []Parameter{}
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r.ReadArray(&ps)
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p.Value = ps
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case MapType:
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ps := []ParameterPair{}
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r.ReadArray(&ps)
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p.Value = ps
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case Hash160Type:
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var u util.Uint160
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r.ReadBytes(u[:])
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p.Value = u
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case Hash256Type:
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var u util.Uint256
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r.ReadBytes(u[:])
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p.Value = u
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case InteropInterfaceType:
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default:
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r.Err = fmt.Errorf("unknown type: %x", p.Type)
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}
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}
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// EncodeBinary implements io.Serializable interface.
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func (p *ParameterPair) EncodeBinary(w *io.BinWriter) {
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p.Key.EncodeBinary(w)
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p.Value.EncodeBinary(w)
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}
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// DecodeBinary implements io.Serializable interface.
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func (p *ParameterPair) DecodeBinary(r *io.BinReader) {
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p.Key.DecodeBinary(r)
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p.Value.DecodeBinary(r)
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}
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// Params is an array of Parameter (TODO: drop it?).
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type Params []Parameter
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// TryParseArray converts an array of Parameter into an array of more appropriate things.
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func (p Params) TryParseArray(vals ...interface{}) error {
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var (
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err error
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i int
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par Parameter
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)
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if len(p) != len(vals) {
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return errors.New("receiver array doesn't fit the Params length")
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}
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for i, par = range p {
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if err = par.TryParse(vals[i]); err != nil {
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return err
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}
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}
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return nil
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}
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// TryParse converts one Parameter into something more appropriate.
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func (p Parameter) TryParse(dest interface{}) error {
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var (
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err error
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ok bool
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data []byte
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)
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switch p.Type {
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case ByteArrayType:
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if data, ok = p.Value.([]byte); !ok {
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return errors.Errorf("failed to cast %s to []byte", p.Value)
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}
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switch dest := dest.(type) {
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case *util.Uint160:
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if *dest, err = util.Uint160DecodeBytesBE(data); err != nil {
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return err
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}
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return nil
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case *[]byte:
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*dest = data
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return nil
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case *util.Uint256:
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if *dest, err = util.Uint256DecodeBytesLE(data); err != nil {
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return err
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}
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return nil
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case *int64, *int32, *int16, *int8, *int, *uint64, *uint32, *uint16, *uint8, *uint:
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var size int
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switch dest.(type) {
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case *int64, *uint64:
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size = 64
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case *int32, *uint32:
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size = 32
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case *int16, *uint16:
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size = 16
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case *int8, *uint8:
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size = 8
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case *int, *uint:
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size = bits.UintSize
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}
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i, err := bytesToUint64(data, size)
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if err != nil {
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return err
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}
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switch dest := dest.(type) {
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case *int64:
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*dest = int64(i)
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case *int32:
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*dest = int32(i)
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case *int16:
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*dest = int16(i)
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case *int8:
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*dest = int8(i)
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case *int:
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*dest = int(i)
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case *uint64:
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*dest = i
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case *uint32:
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*dest = uint32(i)
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case *uint16:
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*dest = uint16(i)
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case *uint8:
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*dest = uint8(i)
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case *uint:
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*dest = uint(i)
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}
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case *string:
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*dest = string(data)
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return nil
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default:
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return errors.Errorf("cannot cast param of type %s to type %s", p.Type, dest)
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}
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default:
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return errors.New("cannot define param type")
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}
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return nil
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}
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func bytesToUint64(b []byte, size int) (uint64, error) {
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var length = size / 8
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if len(b) > length {
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return 0, errors.Errorf("input doesn't fit into %d bits", size)
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}
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if len(b) < length {
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data := make([]byte, length)
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copy(data, b)
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return binary.LittleEndian.Uint64(data), nil
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}
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return binary.LittleEndian.Uint64(b), nil
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}
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// NewParameterFromString returns a new Parameter initialized from the given
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// string in neo-go-specific format. It is intended to be used in user-facing
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// interfaces and has some heuristics in it to simplify parameter passing. Exact
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// syntax is documented in the cli documentation.
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func NewParameterFromString(in string) (*Parameter, error) {
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var (
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char rune
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val string
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err error
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r *strings.Reader
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buf strings.Builder
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escaped bool
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hadType bool
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res = &Parameter{}
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)
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r = strings.NewReader(in)
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for char, _, err = r.ReadRune(); err == nil && char != utf8.RuneError; char, _, err = r.ReadRune() {
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if char == '\\' && !escaped {
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escaped = true
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continue
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}
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if char == ':' && !escaped && !hadType {
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typStr := buf.String()
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res.Type, err = ParseParamType(typStr)
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if err != nil {
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return nil, err
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}
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// We currently do not support following types:
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if res.Type == ArrayType || res.Type == MapType || res.Type == InteropInterfaceType || res.Type == VoidType {
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return nil, errors.Errorf("Unsupported contract parameter type: %s", res.Type)
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}
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buf.Reset()
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hadType = true
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continue
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}
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escaped = false
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// We don't care about length and it never fails.
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_, _ = buf.WriteRune(char)
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}
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if char == utf8.RuneError {
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return nil, errors.New("bad UTF-8 string")
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}
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// The only other error `ReadRune` returns is io.EOF, which is fine and
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// expected, so we don't check err here.
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val = buf.String()
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if !hadType {
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res.Type = inferParamType(val)
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}
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res.Value, err = adjustValToType(res.Type, val)
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if err != nil {
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return nil, err
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}
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return res, nil
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}
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