Add ability to block certain users from registering accounts

Refresh.GameServer/CommandLineManager.cs

@@ -41,6 +41,12 @@ private class Options
 
         [Option('f', "force", Required = false, HelpText = "Force all operations to happen, skipping user consent")]
         public bool Force { get; set; }
+
+        [Option('b', "disallow_user", Required = false, HelpText = "Disallow a user from registering. Username option is required if this is set.")]
+        public bool DisallowUser { get; set; }
+
+        [Option('r', "reallow_user", Required = false, HelpText = "Re-allow a user to register. Username option is requried if this is set.")]
+        public bool ReallowUser { get; set; }
     }
 
     internal void StartWithArgs(string[] args)
@@ -99,5 +105,39 @@ private void StartWithOptions(Options options)
                 Environment.Exit(1);
             }
         }
+
+        if (options.DisallowUser)
+        {
+            if (options.Username != null)
+            {
+                if (!this._server.DisallowUser(options.Username))
+                {
+                    Console.WriteLine("User is already disallowed");
+                    Environment.Exit(1);
+                }
+            }
+            else
+            {
+                Console.WriteLine("No user was provided, cannot continue.");
+                Environment.Exit(1);
+            }
+        }
+
+        if (options.ReallowUser)
+        {
+            if (options.Username != null)
+            {
+                if (!this._server.ReallowUser(options.Username))
+                {
+                    Console.WriteLine("User is already allowed");
+                    Environment.Exit(1);
+                }
+            }
+            else
+            {
+                Console.WriteLine("No user was provided, cannot continue.");
+                Environment.Exit(1);
+            }
+        }
     }
 }

Refresh.GameServer/Database/GameDatabaseContext.Registration.cs

@@ -191,4 +191,39 @@ public void RemoveEmailVerificationCode(EmailVerificationCode code)
             this._realm.Remove(code);
         });
     }
+
+    public bool DisallowUser(string username)
+    {
+        if (this._realm.Find<DisallowedUser>(username) != null) 
+            return false;
+
+        this._realm.Write(() =>
+        {
+            this._realm.Add(new DisallowedUser
+            {
+                Username = username,
+            });
+        });
+
+        return true;
+    }
+
+    public bool ReallowUser(string username)
+    {
+        DisallowedUser? disallowedUser = this._realm.Find<DisallowedUser>(username);
+        if (disallowedUser == null) 
+            return false;
+
+        this._realm.Write(() =>
+        {
+            this._realm.Remove(disallowedUser);
+        });
+
+        return true;
+    }
+
+    public bool IsUserDisallowed(string username)
+    {
+        return this._realm.Find<DisallowedUser>(username) != null;
+    }
 }

Refresh.GameServer/Database/GameDatabaseProvider.cs

@@ -33,7 +33,7 @@ protected GameDatabaseProvider(IDateTimeProvider time)
         this._time = time;
     }
 
-    protected override ulong SchemaVersion => 117;
+    protected override ulong SchemaVersion => 118;
 
     protected override string Filename => "refreshGameServer.realm";
 
@@ -74,6 +74,7 @@ protected GameDatabaseProvider(IDateTimeProvider time)
         typeof(ScreenRect),
         typeof(Slot),
         typeof(GameReview),
+        typeof(DisallowedUser)
     };
 
     public override void Warmup()

Refresh.GameServer/Endpoints/ApiV3/AuthenticationApiEndpoints.cs

@@ -218,6 +218,9 @@ public ApiResponse<IApiAuthenticationResponse> Register(RequestContext context,
         if (!CommonPatterns.EmailAddressRegex().IsMatch(body.EmailAddress))
             return new ApiValidationError("The email address given is invalid.");
 
+        if (database.IsUserDisallowed(body.Username))
+            return new ApiAuthenticationError("This username is disallowed from being registered.");
+
         if (database.IsUsernameTaken(body.Username) || database.IsEmailTaken(body.EmailAddress))
         {
             return new ApiAuthenticationError(

Refresh.GameServer/RefreshGameServer.cs

@@ -223,6 +223,20 @@ public void SetAdminFromEmailAddress(string emailAddress)
 
         context.SetUserRole(user, GameUserRole.Admin);
     }
+
+    public bool DisallowUser(string username)
+    {
+        using GameDatabaseContext context = this.GetContext();
+
+        return context.DisallowUser(username);
+    }
+
+    public bool ReallowUser(string username)
+    {
+        using GameDatabaseContext context = this.GetContext();
+
+        return context.ReallowUser(username);
+    }
 
     public override void Dispose()
     {

Refresh.GameServer/Types/UserData/DisallowedUser.cs

@@ -0,0 +1,9 @@
+using Realms;
+
+namespace Refresh.GameServer.Types.UserData;
+
+public partial class DisallowedUser : IRealmObject
+{
+    [PrimaryKey]
+    public string Username { get; set; }
+}

RefreshTests.GameServer/Tests/ApiV3/UserApiTests.cs

@@ -1,6 +1,7 @@
 using Refresh.GameServer.Authentication;
 using Refresh.GameServer.Endpoints.ApiV3.ApiTypes;
 using Refresh.GameServer.Endpoints.ApiV3.ApiTypes.Errors;
+using Refresh.GameServer.Endpoints.ApiV3.DataTypes.Request.Authentication;
 using Refresh.GameServer.Endpoints.ApiV3.DataTypes.Response;
 using Refresh.GameServer.Types.UserData;
 using RefreshTests.GameServer.Extensions;
@@ -22,6 +23,48 @@ public void GetsUserByUsername()
         Assert.That(response, Is.Not.Null);
         response!.AssertErrorIsEqual(ApiNotFoundError.UserMissingError);
     }
+
+    [Test]
+    public void RegisterAccount()
+    {
+        using TestContext context = this.GetServer();
+
+        const string username = "a_lil_guy";
+
+        ApiResponse<ApiAuthenticationResponse>? response = context.Http.PostData<ApiAuthenticationResponse>("/api/v3/register", new ApiRegisterRequest
+        {
+            Username = username,
+            EmailAddress = "[email protected]",
+            PasswordSha512 = "ee26b0dd4af7e749aa1a8ee3c10ae9923f618980772e473f8819a5d4940e0db27ac185f8a0e1d5f84f88bc887fd67b143732c304cc5fa9ad8e6f57f50028a8ff",
+        });
+        Assert.That(response, Is.Not.EqualTo(null));
+
+        context.Database.Refresh();
+        Assert.That(context.Database.GetUserByUsername(username), Is.Not.EqualTo(null));
+    }
+
+    [Test]
+    public void CannotRegisterAccountWithDisallowedUsername()
+    {
+        using TestContext context = this.GetServer();
+
+        const string username = "a_lil_guy";
+
+        context.Database.DisallowUser(username);
+
+        ApiResponse<ApiAuthenticationResponse>? response = context.Http.PostData<ApiAuthenticationResponse>("/api/v3/register", new ApiRegisterRequest
+        {
+            Username = username,
+            EmailAddress = "[email protected]",
+            PasswordSha512 = "ee26b0dd4af7e749aa1a8ee3c10ae9923f618980772e473f8819a5d4940e0db27ac185f8a0e1d5f84f88bc887fd67b143732c304cc5fa9ad8e6f57f50028a8ff",
+        });
+        Assert.That(response, Is.Not.EqualTo(null));
+        Assert.That(response.Error, Is.Not.EqualTo(null));
+        Assert.That(response.Error.Name, Is.EqualTo("ApiAuthenticationError"));
+
+        context.Database.Refresh();
+        Assert.That(context.Database.GetUserByUsername(username), Is.EqualTo(null));
+    }
 
     [Test]
     public void GetsUserByUuid()