package object import ( "bytes" "crypto/sha256" "errors" "fmt" "github.com/mr-tron/base58" "github.com/nspcc-dev/neofs-api-go/v2/refs" ) // ID represents v2-compatible object identifier. type ID refs.ObjectID var errInvalidIDString = errors.New("incorrect format of the string object ID") // NewIDFromV2 wraps v2 ObjectID message to ID. // // Nil refs.ObjectID converts to nil. func NewIDFromV2(idV2 *refs.ObjectID) *ID { return (*ID)(idV2) } // NewID creates and initializes blank ID. // // Works similar as NewIDFromV2(new(ObjectID)). // // Defaults: // - value: nil. func NewID() *ID { return NewIDFromV2(new(refs.ObjectID)) } // SetSHA256 sets object identifier value to SHA256 checksum. func (id *ID) SetSHA256(v [sha256.Size]byte) { (*refs.ObjectID)(id).SetValue(v[:]) } // Equal returns true if identifiers are identical. func (id *ID) Equal(id2 *ID) bool { return bytes.Equal( (*refs.ObjectID)(id).GetValue(), (*refs.ObjectID)(id2).GetValue(), ) } // ToV2 converts ID to v2 ObjectID message. // // Nil ID converts to nil. func (id *ID) ToV2() *refs.ObjectID { return (*refs.ObjectID)(id) } // 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 object.ID from string: %w", err) } else if len(data) != sha256.Size { return errInvalidIDString } (*refs.ObjectID)(id).SetValue(data) return nil } // String returns base58 string representation of ID. func (id *ID) String() string { return base58.Encode((*refs.ObjectID)(id).GetValue()) } // Marshal marshals ID into a protobuf binary form. // // Buffer is allocated when the argument is empty. // Otherwise, the first buffer is used. func (id *ID) Marshal(b ...[]byte) ([]byte, error) { var buf []byte if len(b) > 0 { buf = b[0] } return (*refs.ObjectID)(id). StableMarshal(buf) } // Unmarshal unmarshals protobuf binary representation of ID. func (id *ID) Unmarshal(data []byte) error { return (*refs.ObjectID)(id). Unmarshal(data) } // MarshalJSON encodes ID to protobuf JSON format. func (id *ID) MarshalJSON() ([]byte, error) { return (*refs.ObjectID)(id). MarshalJSON() } // UnmarshalJSON decodes ID from protobuf JSON format. func (id *ID) UnmarshalJSON(data []byte) error { return (*refs.ObjectID)(id). UnmarshalJSON(data) }