neoneo-go/pkg/smartcontract/manifest/method.go

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package manifest
import (
"encoding/hex"
"encoding/json"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// Parameter represents smartcontract's parameter's definition.
type Parameter struct {
Name string `json:"name"`
Type smartcontract.ParamType `json:"type"`
}
// Event is a description of a single event.
type Event struct {
Name string `json:"name"`
Parameters []Parameter `json:"parameters"`
}
// Group represents a group of smartcontracts identified by a public key.
// Every SC in a group must provide signature of it's hash to prove
// it belongs to a group.
type Group struct {
PublicKey *keys.PublicKey `json:"pubkey"`
Signature []byte `json:"signature"`
}
type groupAux struct {
PublicKey string `json:"pubkey"`
Signature []byte `json:"signature"`
}
// Method represents method's metadata.
type Method struct {
Name string `json:"name"`
Offset int `json:"offset"`
Parameters []Parameter `json:"parameters"`
ReturnType smartcontract.ParamType `json:"returntype"`
}
// NewParameter returns new paramter with the specified name and type.
func NewParameter(name string, typ smartcontract.ParamType) Parameter {
return Parameter{
Name: name,
Type: typ,
}
}
// IsValid checks whether group's signature corresponds to the given hash.
func (g *Group) IsValid(h util.Uint160) bool {
return g.PublicKey.Verify(g.Signature, hash.Sha256(h.BytesBE()).BytesBE())
}
// MarshalJSON implements json.Marshaler interface.
func (g *Group) MarshalJSON() ([]byte, error) {
aux := &groupAux{
PublicKey: hex.EncodeToString(g.PublicKey.Bytes()),
Signature: g.Signature,
}
return json.Marshal(aux)
}
// UnmarshalJSON implements json.Unmarshaler interface.
func (g *Group) UnmarshalJSON(data []byte) error {
aux := new(groupAux)
if err := json.Unmarshal(data, aux); err != nil {
return err
}
b, err := hex.DecodeString(aux.PublicKey)
if err != nil {
return err
}
pub := new(keys.PublicKey)
if err := pub.DecodeBytes(b); err != nil {
return err
}
g.PublicKey = pub
g.Signature = aux.Signature
return nil
}