311 lines
7 KiB
Go
311 lines
7 KiB
Go
package smartcontract
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import (
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"encoding/hex"
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"errors"
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"strconv"
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"strings"
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"unicode/utf8"
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"github.com/CityOfZion/neo-go/pkg/crypto"
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"github.com/CityOfZion/neo-go/pkg/crypto/keys"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// ParamType represents the Type of the contract parameter.
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type ParamType byte
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// A list of supported smart contract parameter types.
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const (
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SignatureType ParamType = iota
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BoolType
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IntegerType
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Hash160Type
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Hash256Type
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ByteArrayType
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PublicKeyType
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StringType
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ArrayType
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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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HasDynamicInvoke
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IsPayable
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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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func (pt ParamType) String() string {
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switch pt {
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case SignatureType:
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return "Signature"
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case BoolType:
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return "Boolean"
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case IntegerType:
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return "Integer"
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case Hash160Type:
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return "Hash160"
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case Hash256Type:
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return "Hash256"
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case ByteArrayType:
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return "ByteArray"
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case PublicKeyType:
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return "PublicKey"
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case StringType:
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return "String"
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case ArrayType:
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return "Array"
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default:
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return ""
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}
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}
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// MarshalJSON implements the json.Marshaler interface.
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func (pt ParamType) MarshalJSON() ([]byte, error) {
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return []byte(`"` + pt.String() + `"`), nil
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}
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// EncodeBinary implements io.Serializable interface.
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func (pt ParamType) EncodeBinary(w *io.BinWriter) {
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w.WriteLE(pt)
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}
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// DecodeBinary implements io.Serializable interface.
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func (pt *ParamType) DecodeBinary(r *io.BinReader) {
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r.ReadLE(pt)
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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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// parseParamType is a user-friendly string to ParamType converter, it's
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// case-insensitive and makes the following conversions:
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// signature -> SignatureType
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// bool -> BoolType
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// int -> IntegerType
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// hash160 -> Hash160Type
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// hash256 -> Hash256Type
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// bytes -> ByteArrayType
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// key -> PublicKeyType
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// string -> StringType
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// anything else generates an error.
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func parseParamType(typ string) (ParamType, error) {
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switch strings.ToLower(typ) {
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case "signature":
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return SignatureType, nil
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case "bool":
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return BoolType, nil
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case "int":
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return IntegerType, nil
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case "hash160":
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return Hash160Type, nil
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case "hash256":
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return Hash256Type, nil
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case "bytes":
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return ByteArrayType, nil
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case "key":
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return PublicKeyType, nil
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case "string":
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return StringType, nil
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default:
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// We deliberately don't support array here.
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return 0, errors.New("wrong or unsupported parameter type")
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}
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}
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// adjustValToType is a value type-checker and converter.
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func adjustValToType(typ ParamType, val string) (interface{}, error) {
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switch typ {
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case SignatureType:
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b, err := hex.DecodeString(val)
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if err != nil {
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return nil, err
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}
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if len(b) != 64 {
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return nil, errors.New("not a signature")
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}
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return val, nil
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case BoolType:
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switch val {
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case "true":
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return true, nil
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case "false":
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return false, nil
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default:
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return nil, errors.New("invalid boolean value")
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}
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case IntegerType:
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return strconv.Atoi(val)
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case Hash160Type:
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u, err := crypto.Uint160DecodeAddress(val)
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if err == nil {
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return hex.EncodeToString(u.Bytes()), nil
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}
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b, err := hex.DecodeString(val)
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if err != nil {
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return nil, err
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}
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if len(b) != 20 {
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return nil, errors.New("not a hash160")
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}
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return val, nil
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case Hash256Type:
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b, err := hex.DecodeString(val)
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if err != nil {
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return nil, err
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}
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if len(b) != 32 {
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return nil, errors.New("not a hash256")
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}
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return val, nil
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case ByteArrayType:
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_, err := hex.DecodeString(val)
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if err != nil {
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return nil, err
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}
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return val, nil
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case PublicKeyType:
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_, err := keys.NewPublicKeyFromString(val)
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if err != nil {
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return nil, err
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}
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return val, nil
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case StringType:
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return val, nil
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default:
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return nil, errors.New("unsupported parameter type")
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}
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}
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// inferParamType tries to infer the value type from its contents. It returns
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// IntegerType for anything that looks like decimal integer (can be converted
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// with strconv.Atoi), BoolType for true and false values, Hash160Type for
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// addresses and hex strings encoding 20 bytes long values, PublicKeyType for
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// valid hex-encoded public keys, Hash256Type for hex-encoded 32 bytes values,
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// SignatureType for hex-encoded 64 bytes values, ByteArrayType for any other
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// valid hex-encoded values and StringType for anything else.
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func inferParamType(val string) ParamType {
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var err error
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_, err = strconv.Atoi(val)
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if err == nil {
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return IntegerType
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}
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if val == "true" || val == "false" {
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return BoolType
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}
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_, err = crypto.Uint160DecodeAddress(val)
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if err == nil {
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return Hash160Type
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}
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_, err = keys.NewPublicKeyFromString(val)
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if err == nil {
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return PublicKeyType
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}
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unhexed, err := hex.DecodeString(val)
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if err == nil {
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switch len(unhexed) {
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case 20:
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return Hash160Type
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case 32:
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return Hash256Type
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case 64:
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return SignatureType
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default:
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return ByteArrayType
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}
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}
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// Anything can be a string.
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return StringType
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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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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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// ContextItem represents a transaction context item.
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type ContextItem struct {
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Script util.Uint160
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Parameters []Parameter
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Signatures []Signature
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}
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// Signature represents a transaction signature.
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type Signature struct {
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Data []byte
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PublicKey []byte
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}
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// ParameterContext holds the parameter context.
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type ParameterContext struct{}
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