Chromoting protocol layers to receive and send login messages

remoting/proto/auth.proto

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Messages related to Client/Host Mutual Authentication and Local Login.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package remoting.protocol;
 
 // Represents the data used in generating the client auth token during session
 // initiation.
 message ClientAuthToken {
   optional string host_full_jid = 1;
   optional string client_full_jid = 2;
 
   // A short-lived OAuth token identifying the client to the host.
   optional string client_oauth_token = 3;
 }
 
 // There can be more challenge types later
 enum CredentialType {
   PASSWORD = 0;
 }
 
 message LocalLoginCredentials {
-  optional CredentialType type = 1;
+  required CredentialType type = 1;
   optional string username = 2;
   optional bytes credential = 3;
 }
 
 message LocalLoginStatus {
-  optional bool success = 1;
+  required bool success = 1;
 
   // Only populated if success is set to false.
   optional int32 tries_remaining = 2 [default = 0];
   optional string error_info = 3;
 }
 
 // Sent from the Host to the Client.  This is the first message after
 // channels are established.
 message LocalLoginProperties {
   repeated CredentialType supported_credential_types = 1;
 
   // Used to generate the bank style anti-phishing image.
   // This info is stored only on the host.
   optional bytes antiphish_image = 2;
   optional bytes antiphish_text = 3;
 }
 
 // Sent from Client to Host.  This consists of both the login attempt,
 // and any session configuration information.
 message BeginSessionRequest {
-  optional LocalLoginCredentials credentials = 1;
+  required LocalLoginCredentials credentials = 1;
 }
 
 // Sent from Host to Client.  Replies with login success, and
 // final client configuration.
 message BeginSessionResponse {
-  optional LocalLoginStatus login_status = 1;
+  required LocalLoginStatus login_status = 1;
 }