syntax = "proto3";

package neo.fs.v2.service;

option go_package = "github.com/nspcc-dev/neofs-api-go/v2/service/grpc;service";
option csharp_namespace = "NeoFS.API.v2.Service";

import "acl/types.proto";
import "refs/types.proto";

// Extended headers for Request/Response
message XHeader {
  // Key of the X-Header.
  string key = 1;

  // Value of the X-Header.
  string value = 2;
}

// Represents API version used by node.
message Version {
  // Major API version.
  uint32 major = 1;

  // Minor API version.
  uint32 minor = 2;
}

// Lifetime parameters of the token. Filed names taken from rfc7519.
message TokenLifetime {
  // Expiration Epoch
  uint64 exp = 1;

  // Not valid before Epoch
  uint64 nbf = 2;

  // Issued at Epoch
  uint64 iat = 3;
}

// Context information for Session Tokens related to ObjectService requests
message ObjectSessionContext {
  // Object request verbs
  enum Verb {
    // Unknown verb
    VERB_UNSPECIFIED = 0;

    // Refers to object.Put RPC call
    PUT = 1;

    // Refers to object.Get RPC call
    GET = 2;

    // Refers to object.Head RPC call
    HEAD = 3;

    // Refers to object.Search RPC call
    SEARCH = 4;

    // Refers to object.Delete RPC call
    DELETE = 5;

    // Refers to object.GetRange RPC call
    RANGE = 6;

    // Refers to object.GetRangeHash RPC call
    RANGEHASH = 7;
  }
  // Verb is a type of request for which the token is issued
  Verb verb = 1;

  // Related Object address
  neo.fs.v2.refs.Address address = 2;
}

// NeoFS session token.
message SessionToken {
  // Session token body
  message Body {
    // ID is a token identifier. valid UUIDv4 represented in bytes
    bytes id = 1;

    // OwnerID carries identifier of the session initiator.
    neo.fs.v2.refs.OwnerID owner_id = 2;

    // Lifetime is a lifetime of the session
    TokenLifetime lifetime = 3;

    // SessionKey is a public key of session key
    bytes session_key = 4;

    // Carries context of the session.
    oneof context {
      // ObjectService session context.
      ObjectSessionContext object = 5;
    }
  }
  // Session Token body
  Body body = 1;

  // Signature is a signature of session token information
  Signature signature = 2;
}

// BearerToken has information about request ACL rules with limited lifetime
message BearerToken {
  // Bearer Token body
  message Body {
    // EACLTable carries table of extended ACL rules
    neo.fs.v2.acl.EACLTable eacl_table = 1;

    // OwnerID carries identifier of the token owner
    neo.fs.v2.refs.OwnerID owner_id = 2;

    // Token expiration and valid time period parameters
    TokenLifetime lifetime = 3;
  }
  // Bearer Token body
  Body body = 1;

  // Signature of BearerToken body
  Signature signature = 2;
}

// Information about the request
message RequestMetaHeader {
  // Client API version.
  Version version = 1;

  // Client local epoch number. Set to 0 if unknown.
  uint64 epoch = 2;

  // Maximum number of nodes in the request route.
  uint32 ttl = 3;

  // Request X-Headers.
  repeated XHeader x_headers = 4;

  // Token is a token of the session within which the request is sent
  SessionToken session_token = 5;

  // Bearer is a Bearer token of the request
  BearerToken bearer_token = 6;

  // RequestMetaHeader of the origin request.
  RequestMetaHeader origin = 7;
}

// Information about the response
message ResponseMetaHeader {
  // Server API version.
  Version version = 1;

  // Server local epoch number.
  uint64 epoch = 2;

  // Maximum number of nodes in the response route.
  uint32 ttl = 3;

  // Response X-Headers.
  repeated XHeader x_headers = 4;

  // Carries response meta header of the origin response.
  ResponseMetaHeader origin = 5;
}

// Signature of something in NeoFS
message Signature {
  // Public key used for signing.
  bytes key = 1;
  // Signature
  bytes sign = 2;
}

// Verification info for request signed by all intermediate nodes
message RequestVerificationHeader {
  // Request Body signature. Should be generated once by request initiator.
  Signature body_signature = 1;
  // Request Meta signature is added and signed by any intermediate node
  Signature meta_signature = 2;
  // Sign previous hops
  Signature origin_signature = 3;

  // Chain of previous hops signatures
  RequestVerificationHeader origin = 4;
}

// Verification info for response signed by all intermediate nodes
message ResponseVerificationHeader {
  // Response Body signature. Should be generated once by answering node.
  Signature body_signature = 1;
  // Response Meta signature is added and signed by any intermediate node
  Signature meta_signature = 2;
  // Sign previous hops
  Signature origin_signature = 3;

  // Chain of previous hops signatures
  ResponseVerificationHeader origin = 4;
}