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 }