syntax = "proto3"; package auth; service AuthService { rpc Login(LoginRequest) returns (LoginResponse); rpc ValidateToken(ValidateTokenRequest) returns (ValidateTokenResponse); } message LoginRequest { string username = 1; string password = 2; } message LoginResponse { string token = 1; string user_id = 2; } message ValidateTokenRequest { string token = 1; } message ValidateTokenResponse { bool valid = 1; string user_id = 2; }