syntax = "proto3";

message User {
  int32 id = 1;
  string email = 2;
}

message Error {
  string details = 1;
}

message SessionRequest {
  string app_version = 1;
}

message SessionResponse {
  string id = 1;
  User user = 2;
}

message Request {
  int32 id = 1;

  oneof type {
    SessionRequest session = 2;
  }
}

message Response {
  int32 id = 1;

  oneof type {
    Error error = 2;

    SessionResponse session = 3;
  }
}