User management protocol (#214)

## Release notes: usage and product changes
Declare user management messages and services, which lets the caller
make user creation, update, deletion, and retrieval call through gRPC.

## Implementation
Declare the associated gRPC services and Protobuf messages for user
creation, update, deletion, and retrieval.

Author: lolski

proto/typedb-service.proto

@@ -17,20 +17,18 @@ service TypeDB {
     // Connection API
     rpc connection_open (Connection.Open.Req) returns (Connection.Open.Res);
 
-//    // Server Manager API
+    // Server Manager API
     rpc servers_all (ServerManager.All.Req) returns (ServerManager.All.Res);
-//
-//    // User Manager API
-//    rpc users_contains (UserManager.Contains.Req) returns (UserManager.Contains.Res);
-//    rpc users_create (UserManager.Create.Req) returns (UserManager.Create.Res);
-//    rpc users_delete (UserManager.Delete.Req) returns (UserManager.Delete.Res);
-//    rpc users_all (UserManager.All.Req) returns (UserManager.All.Res);
-//    rpc users_password_set (UserManager.PasswordSet.Req) returns (UserManager.PasswordSet.Res);
-//    rpc users_get (UserManager.Get.Req) returns (UserManager.Get.Res);
-//
-//    // User API
-//    rpc user_password_update (User.PasswordUpdate.Req) returns (User.PasswordUpdate.Res);
-//    rpc user_token (User.Token.Req) returns (User.Token.Res);
+
+    // User Manager API
+    rpc users_get (UserManager.Get.Req) returns (UserManager.Get.Res);
+    rpc users_all (UserManager.All.Req) returns (UserManager.All.Res);
+    rpc users_contains (UserManager.Contains.Req) returns (UserManager.Contains.Res);
+    rpc users_create (UserManager.Create.Req) returns (UserManager.Create.Res);
+
+    // User API
+    rpc users_update (User.Update.Req) returns (User.Update.Res);
+    rpc users_delete (User.Delete.Req) returns (User.Delete.Res);
 
     // Database Manager API
     rpc databases_get (DatabaseManager.Get.Req) returns (DatabaseManager.Get.Res);

proto/user.proto

@@ -7,76 +7,61 @@ syntax = "proto3";
 package typedb.protocol;
 
 message UserManager {
+    message All {
+        message Req {}
 
-    message Contains {
-        message Req {
-            string username = 1;
-        }
         message Res {
-            bool contains = 1;
-        }
-    }
-
-    message Create {
-        message Req {
-            string username = 1;
-            string password = 2;
+            repeated User users = 1;
         }
-        message Res {}
     }
 
-    message Delete {
+    message Contains {
         message Req {
-            string username = 1;
+            string name = 1;
         }
-        message Res {}
-    }
 
-    message All {
-        message Req {}
         message Res {
-            repeated User users = 1;
+            bool contains = 1;
         }
     }
 
-    message PasswordSet {
+    message Get {
         message Req {
-            string username = 1;
-            string password = 2;
+            string name = 1;
+        }
+
+        message Res {
+            User user = 1;
         }
-        message Res {}
     }
 
-    message Get {
+    message Create {
         message Req {
-            string username = 1;
-        }
-        message Res {
             User user = 1;
         }
+
+        message Res {}
     }
 }
 
 message User {
-    string username = 1;
-    optional int64 password_expiry_seconds = 2;
+    string name = 1;
+    optional string password = 2;
 
-    message PasswordUpdate {
+    message Update {
         message Req {
-            string username = 1;
-            string password_old = 2;
-            string password_new = 3;
+            string name = 1;
+            User user = 2;
         }
+
         message Res {}
     }
 
-    message Token {
+    message Delete {
         message Req {
-            string username = 1;
+            string name = 1;
         }
 
-        message Res {
-            string token = 1;
-        }
+        message Res {}
     }
 }