mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-26 19:42:23 +00:00
123 lines
2.9 KiB
Go
123 lines
2.9 KiB
Go
package payload
|
|
|
|
import (
|
|
"errors"
|
|
"math"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
|
|
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
|
|
"github.com/nspcc-dev/neo-go/pkg/io"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
)
|
|
|
|
const (
|
|
maxExtensibleCategorySize = 32
|
|
maxExtensibleDataSize = math.MaxUint16
|
|
)
|
|
|
|
// Extensible represents payload containing arbitrary data.
|
|
type Extensible struct {
|
|
// Network represents network magic.
|
|
Network netmode.Magic
|
|
// Category is payload type.
|
|
Category string
|
|
// ValidBlockStart is starting height for payload to be valid.
|
|
ValidBlockStart uint32
|
|
// ValidBlockEnd is height after which payload becomes invalid.
|
|
ValidBlockEnd uint32
|
|
// Sender is payload sender or signer.
|
|
Sender util.Uint160
|
|
// Data is custom payload data.
|
|
Data []byte
|
|
// Witness is payload witness.
|
|
Witness transaction.Witness
|
|
|
|
hash util.Uint256
|
|
signedHash util.Uint256
|
|
signedpart []byte
|
|
}
|
|
|
|
var errInvalidPadding = errors.New("invalid padding")
|
|
|
|
// NewExtensible creates new extensible payload.
|
|
func NewExtensible(network netmode.Magic) *Extensible {
|
|
return &Extensible{Network: network}
|
|
}
|
|
|
|
func (e *Extensible) encodeBinaryUnsigned(w *io.BinWriter) {
|
|
w.WriteString(e.Category)
|
|
w.WriteU32LE(e.ValidBlockStart)
|
|
w.WriteU32LE(e.ValidBlockEnd)
|
|
w.WriteBytes(e.Sender[:])
|
|
w.WriteVarBytes(e.Data)
|
|
}
|
|
|
|
// EncodeBinary implements io.Serializable.
|
|
func (e *Extensible) EncodeBinary(w *io.BinWriter) {
|
|
e.encodeBinaryUnsigned(w)
|
|
w.WriteB(1)
|
|
e.Witness.EncodeBinary(w)
|
|
}
|
|
|
|
func (e *Extensible) decodeBinaryUnsigned(r *io.BinReader) {
|
|
e.Category = r.ReadString(maxExtensibleCategorySize)
|
|
e.ValidBlockStart = r.ReadU32LE()
|
|
e.ValidBlockEnd = r.ReadU32LE()
|
|
r.ReadBytes(e.Sender[:])
|
|
e.Data = r.ReadVarBytes(MaxSize)
|
|
}
|
|
|
|
// DecodeBinary implements io.Serializable.
|
|
func (e *Extensible) DecodeBinary(r *io.BinReader) {
|
|
e.decodeBinaryUnsigned(r)
|
|
if r.ReadB() != 1 {
|
|
if r.Err != nil {
|
|
return
|
|
}
|
|
r.Err = errInvalidPadding
|
|
return
|
|
}
|
|
e.Witness.DecodeBinary(r)
|
|
}
|
|
|
|
// GetSignedPart implements crypto.Verifiable.
|
|
func (e *Extensible) GetSignedPart() []byte {
|
|
if e.signedpart == nil {
|
|
e.createHash()
|
|
}
|
|
return e.signedpart
|
|
}
|
|
|
|
// GetSignedHash implements crypto.Verifiable.
|
|
func (e *Extensible) GetSignedHash() util.Uint256 {
|
|
if e.signedHash.Equals(util.Uint256{}) {
|
|
e.createHash()
|
|
}
|
|
return e.signedHash
|
|
}
|
|
|
|
// Hash returns payload hash.
|
|
func (e *Extensible) Hash() util.Uint256 {
|
|
if e.hash.Equals(util.Uint256{}) {
|
|
e.createHash()
|
|
}
|
|
return e.hash
|
|
}
|
|
|
|
// createHash creates hashes of the payload.
|
|
func (e *Extensible) createHash() {
|
|
buf := io.NewBufBinWriter()
|
|
e.encodeBinaryUnsigned(buf.BinWriter)
|
|
e.hash = hash.Sha256(buf.Bytes())
|
|
e.updateSignedPart()
|
|
e.signedHash = hash.Sha256(e.signedpart)
|
|
}
|
|
|
|
// updateSignedPart updates serialized message if needed.
|
|
func (e *Extensible) updateSignedPart() {
|
|
buf := io.NewBufBinWriter()
|
|
buf.WriteU32LE(uint32(e.Network))
|
|
buf.WriteBytes(e.hash[:])
|
|
e.signedpart = buf.Bytes()
|
|
}
|