syntax = "proto3";

package neo.fs.v2.refs;

option go_package = "github.com/nspcc-dev/neofs-api-go/v2/refs/grpc;refs";
option csharp_namespace = "Neo.FileStorage.API.Refs";

// Objects in NeoFS are addressed by their ContainerID and ObjectID.
//
// String presentation of `Address` is the concatenation of string encoded
// `ContainerID` and `ObjectID` delimited by '/' character.
message Address {
  // Container identifier
  ContainerID container_id = 1 [json_name = "containerID"];
  // Object identifier
  ObjectID object_id = 2 [json_name = "objectID"];
}

// NeoFS Object unique identifier. Objects are immutable and content-addressed.
// It means `ObjectID` will change if `header` or `payload` changes.
//
// `ObjectID` is a 32 byte long
// [SHA256](https://csrc.nist.gov/publications/detail/fips/180/4/final) hash of
// object's `header` field, which, in it's turn, contains hash of object's
// payload.
//
// String presentation is
// [base58](https://tools.ietf.org/html/draft-msporny-base58-02) encoded string.
//
// JSON value will be the data encoded as a string using standard base64
// encoding with paddings. Either
// [standard](https://tools.ietf.org/html/rfc4648#section-4) or
// [URL-safe](https://tools.ietf.org/html/rfc4648#section-5) base64 encoding
// with/without paddings are accepted.
message ObjectID {
  // Object identifier in a binary format
  bytes value = 1 [json_name = "value"];
}

// NeoFS container identifier. Container structures are immutable and
// content-addressed.
//
// `ContainerID` is a 32 byte long
// [SHA256](https://csrc.nist.gov/publications/detail/fips/180/4/final) hash of
// stable-marshalled container message.
//
// String presentation is
// [base58](https://tools.ietf.org/html/draft-msporny-base58-02) encoded string.
//
// JSON value will be the data encoded as a string using standard base64
// encoding with paddings. Either
// [standard](https://tools.ietf.org/html/rfc4648#section-4) or
// [URL-safe](https://tools.ietf.org/html/rfc4648#section-5) base64 encoding
// with/without paddings are accepted.
message ContainerID {
  // Container identifier in a binary format.
  bytes value = 1 [json_name = "value"];
}

// `OwnerID` is a derivative of a user's main public key. The transformation
// algorithm is the same as for Neo3 wallet addresses. Neo3 wallet address can
// be directly used as `OwnerID`.
//
// `OwnerID` is a 25 bytes sequence starting with Neo version prefix byte
// followed by 20 bytes of ScrptHash and 4 bytes of checksum.
//
// String presentation is [Base58
// Check](https://en.bitcoin.it/wiki/Base58Check_encoding) Encoded string.
//
// JSON value will be the data encoded as a string using standard base64
// encoding with paddings. Either
// [standard](https://tools.ietf.org/html/rfc4648#section-4) or
// [URL-safe](https://tools.ietf.org/html/rfc4648#section-5) base64 encoding
// with/without paddings are accepted.
message OwnerID {
  // Identifier of the container owner in a binary format
  bytes value = 1 [json_name = "value"];
}

// NeoFS subnetwork identifier.
//
// String representation of a value is base-10 integer.
//
// JSON representation is an object containing single `value` number field.
message SubnetID {
  // 4-byte integer subnetwork identifier.
  fixed32 value = 1 [json_name = "value"];
}

// API version used by a node.
//
// String presentation is a Semantic Versioning 2.0.0 compatible version string
// with 'v' prefix. I.e. `vX.Y`, where `X` - major number, `Y` - minor number.
message Version {
  // Major API version
  uint32 major = 1 [json_name = "major"];

  // Minor API version
  uint32 minor = 2 [json_name = "minor"];
}

// Signature of something in NeoFS.
message Signature {
  // Public key used for signing
  bytes key = 1 [json_name = "key"];
  // Signature
  bytes sign = 2 [json_name = "signature"];
  // Scheme contains digital signature scheme identifier.
  SignatureScheme scheme = 3 [json_name = "scheme"];
}

// Signature scheme describes digital signing scheme used for (key, signature) pair.
enum SignatureScheme {
  // Unknown. The default interpretation depends on a particular structure type.
  UNSPECIFIED = 0;
  // ECDSA with SHA-512 hashing (FIPS 186-3).
  ECDSA_SHA512 = 1;
  // Deterministic ECDSA with SHA-256 hashing (RFC 6979)
  ECDSA_RFC6979_SHA256 = 2;
}

// Checksum algorithm type.
enum ChecksumType {
  // Unknown. Not used
  CHECKSUM_TYPE_UNSPECIFIED = 0;

  // Tillich-Zemor homomorphic hash function
  TZ = 1;

  // SHA-256
  SHA256 = 2;
}

// Checksum message.
// Depending on checksum algorithm type the string presentation may vary:
//
// * TZ \
//   Hex encoded string without `0x` prefix
// * SHA256 \
//   Hex encoded string without `0x` prefix
message Checksum {
  // Checksum algorithm type
  ChecksumType type = 1 [json_name = "type"];

  // Checksum itself
  bytes sum = 2 [json_name = "sum"];
}