cross server client

common/proto/auth.proto

@@ -2,9 +2,10 @@
 syntax = "proto3";
 package komp_ac.auth;
 
-import "common.proto";
-
 service AuthService {
+  // Identifies the logical database before the client selects a saved token.
+  // This endpoint is deliberately unauthenticated.
+  rpc GetServerIdentity(GetServerIdentityRequest) returns (ServerIdentity);
   rpc Register(RegisterRequest) returns (AuthResponse);
   rpc Login(LoginRequest) returns (LoginResponse);
   // Changes the authenticated user's password after verifying the current one.
@@ -45,6 +46,12 @@ service AuthService {
   rpc ListUsers(ListUsersRequest) returns (ListUsersResponse);
 }
 
+message ServerIdentity {
+  string instance_id = 1; // Stable UUID stored inside this database
+}
+
+message GetServerIdentityRequest {}
+
 message RegisterRequest {
   string username = 1;
   string email = 2;