frostfs-sdk-go/owner/id.go

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package owner
import (
"bytes"
"crypto/ecdsa"
"errors"
"fmt"
"github.com/mr-tron/base58"
"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/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/wallet"
"github.com/nspcc-dev/neofs-api-go/v2/refs"
)
// ID represents v2-compatible owner identifier.
type ID refs.OwnerID
var errInvalidIDString = errors.New("incorrect format of the string owner ID")
// ErrEmptyPublicKey when public key passed to Verify method is nil.
var ErrEmptyPublicKey = errors.New("empty public key")
// NEO3WalletSize contains size of neo3 wallet.
const NEO3WalletSize = 25
// NewIDFromV2 wraps v2 OwnerID message to ID.
//
// Nil refs.OwnerID converts to nil.
func NewIDFromV2(idV2 *refs.OwnerID) *ID {
return (*ID)(idV2)
}
// NewID creates and initializes blank ID.
//
// Works similar as NewIDFromV2(new(OwnerID)).
//
// Defaults:
// - value: nil.
func NewID() *ID {
return NewIDFromV2(new(refs.OwnerID))
}
// SetPublicKey sets owner identifier value to the provided NEO3 public key.
func (id *ID) SetPublicKey(pub *ecdsa.PublicKey) {
(*refs.OwnerID)(id).SetValue(PublicKeyToIDBytes(pub))
}
// ToV2 returns the v2 owner ID message.
//
// Nil ID converts to nil.
func (id *ID) ToV2() *refs.OwnerID {
return (*refs.OwnerID)(id)
}
// String implements fmt.Stringer.
func (id *ID) String() string {
return base58.Encode((*refs.OwnerID)(id).GetValue())
}
// Equal defines a comparison relation on ID's.
//
// ID's are equal if they have the same binary representation.
func (id *ID) Equal(id2 *ID) bool {
return bytes.Equal(
(*refs.ObjectID)(id).GetValue(),
(*refs.ObjectID)(id2).GetValue(),
)
}
// NewIDFromPublicKey creates new owner identity from ECDSA public key.
func NewIDFromPublicKey(pub *ecdsa.PublicKey) *ID {
id := NewID()
id.SetPublicKey(pub)
return id
}
// NewIDFromPublicKey creates new owner identity from N3 wallet account.
func NewIDFromN3Account(acc *wallet.Account) *ID {
return NewIDFromPublicKey(
(*ecdsa.PublicKey)(acc.PrivateKey().PublicKey()))
}
// Parse converts base58 string representation into ID.
func (id *ID) Parse(s string) error {
data, err := base58.Decode(s)
if err != nil {
return fmt.Errorf("could not parse owner.ID from string: %w", err)
} else if !valid(data) {
return errInvalidIDString
}
(*refs.OwnerID)(id).SetValue(data)
return nil
}
// Valid returns true if id is a valid owner id.
// The rules for v2 are the following:
// 1. Must be 25 bytes in length.
// 2. Must have N3 address prefix-byte.
// 3. Last 4 bytes must contain the address checksum.
func (id *ID) Valid() bool {
rawID := id.ToV2().GetValue()
return valid(rawID)
}
func valid(rawID []byte) bool {
if len(rawID) != NEO3WalletSize {
return false
}
if rawID[0] != address.NEO3Prefix {
return false
}
const boundIndex = NEO3WalletSize - 4
return bytes.Equal(rawID[boundIndex:], hash.Checksum(rawID[:boundIndex]))
}
// Marshal marshals ID into a protobuf binary form.
func (id *ID) Marshal() ([]byte, error) {
return (*refs.OwnerID)(id).StableMarshal(nil)
}
// Unmarshal unmarshals protobuf binary representation of ID.
func (id *ID) Unmarshal(data []byte) error {
return (*refs.OwnerID)(id).Unmarshal(data)
}
// MarshalJSON encodes ID to protobuf JSON format.
func (id *ID) MarshalJSON() ([]byte, error) {
return (*refs.OwnerID)(id).MarshalJSON()
}
// UnmarshalJSON decodes ID from protobuf JSON format.
func (id *ID) UnmarshalJSON(data []byte) error {
return (*refs.OwnerID)(id).UnmarshalJSON(data)
}
// PublicKeyToIDBytes converts public key to a byte slice of NEO3WalletSize length.
// It is similar to decoding a NEO3 address but is inlined to skip base58 encoding-decoding step
// make it clear that no errors can occur.
func PublicKeyToIDBytes(pub *ecdsa.PublicKey) []byte {
sh := (*keys.PublicKey)(pub).GetScriptHash()
b := make([]byte, NEO3WalletSize)
b[0] = address.Prefix
copy(b[1:], sh.BytesBE())
copy(b[21:], hash.Checksum(b[:21]))
return b
}