syntax = "proto3";
package object;
option go_package = "github.com/nspcc-dev/neofs-api-go/object";
option csharp_namespace = "NeoFS.API.Object";

import "refs/types.proto";
import "service/verify.proto";
import "storagegroup/types.proto";

// Attribute groups the parameters of the object attributes.
message Attribute {
    // Key carries the string key to the object attribute.
    string Key = 1;

    // Value carries the string value of the object attribute.
    string Value = 2;
}

message ExtendedHeader {
    // Link to other objects
    Link Link = 1;
    // Redirect not used yet
    refs.Address Redirect = 2;
    // Attribute is a set of K-V object attributes
    Attribute Attribute = 3;
    // Split carries the position of the object in the split hierarchy.
    SplitHeader SplitHeader = 4;
    // Tombstone header that set up in deleted objects
    Tombstone Tombstone = 5;
    // Token header contains token of the session within which the object was created
    service.Token Token = 6;
    // HomoHash is a homomorphic hash of original object payload
    bytes HomoHash = 7;
    // PayloadChecksum of actual object's payload
    bytes PayloadChecksum = 8;
    // Integrity header with checksum of all above headers in the object
    IntegrityHeader Integrity = 9;
    // StorageGroup contains meta information for the data audit
    storagegroup.StorageGroup StorageGroup = 10;
    // PublicKey of owner of the object. Key is used for verification and can be based on NeoID or x509 cert.
    PublicKey PublicKey = 11;
}

message Tombstone {}

message SystemHeader {
    // Version of the object structure
    uint64 Version       = 1;
    // PayloadLength is an object payload length
    uint64 PayloadLength = 2;
    // Address carries object address in the NeoFS system.
    // It encapsulates the object and the container identifiers.
    refs.Address Address = 3;
    // OwnerID is a wallet address
    bytes OwnerID = 4;
    // CreationEpoch carries number of NeoFS epoch on which the object was created.
    uint64 CreationEpoch = 6;
}

message IntegrityHeader {
    // HeadersChecksum is a checksum of all above headers in the object
    bytes HeadersChecksum   = 1;
    // ChecksumSignature is an user's signature of checksum to verify if it is correct
    bytes ChecksumSignature = 2;
}

message Link {
    enum Type {
        Unknown      = 0;
        // Parent object created during object transformation
        Parent       = 1;
        // Previous object in the linked list created during object transformation
        Previous     = 2;
        // Next object in the linked list created during object transformation
        Next         = 3;
        // Child object created during object transformation
        Child        = 4;
        // Object that included into this storage group
        StorageGroup = 5;
    }
    // Type of link
    Type type  = 1;
    // ID is an object identifier, is a valid UUIDv4
    bytes ID = 2;
}

// SplitHeader groups information about spawning the object through a payload splitting.
message SplitHeader {
    // Parent carries identifier of the origin object.
    refs.ObjectID Parent = 1;

    // Previous carries identifier of the left split neighbor.
    refs.ObjectID Previous = 2;

    // Previous carries identifier of the right split neighbor.
    refs.ObjectID Next = 3;

    // Children carries list of identifiers of the objects generated by splitting the current.
    repeated refs.ObjectID Children = 4;

    // Origin carries the header of the origin object.
    Header Origin = 5;
}

// Header groups the information about the NeoFS object.
message Header {
    // SystemHeader describes system header
    SystemHeader SystemHeader = 1;

    // ExtendedHeader carries the additional part of the header.
    ExtendedHeader ExtendedHeader = 2;
}

message Object {
    // Header carries the object header.
    Header Header = 1;
    // Payload is an object's payload
    bytes Payload = 2;
}

message PublicKey {
    // Value contains marshaled ecdsa public key
    bytes Value = 1;
}