Added the option to disable register

Moonlight/Core/Configuration/CoreConfiguration.cs

@@ -69,6 +69,10 @@ public class CoreConfiguration
         [JsonProperty("TokenDuration")]
         [Description("This specifies the duration the token of an user will be valid. The value specifies the days")]
         public int TokenDuration { get; set; } = 30;
+
+        [JsonProperty("DenyRegister")]
+        [Description("This disables the register function. No user will be able to sign up anymore. Its recommended to enable this for private instances")]
+        public bool DenyRegister { get; set; } = false;
     }
 
     public class SecurityData

Moonlight/Core/UI/Components/Auth/Register.razor

@@ -6,57 +6,70 @@
 @using Moonlight.Core.Models.Forms
 @using Moonlight.Core.Services
 @using MoonCore.Exceptions
+@using MoonCore.Services
 @using MoonCoreUI.Services
+@using Moonlight.Core.Configuration
 
 @inject IAuthenticationProvider AuthenticationProvider
 @inject IdentityService IdentityService
 @inject CookieService CookieService
 @inject NavigationManager Navigation
+@inject ConfigService<CoreConfiguration> ConfigService
 
 <div class="d-flex justify-content-center">
     <div class="d-flex align-items-center">
         <div class="card card-body m-15 p-15">
-            <div class="text-center mb-8">
-                <div class="fw-bold mb-3 fs-1">
-                    Register
-                </div>
-                <div class="text-gray-400 fw-semibold fs-4">
-                    Register in order to start managing your services
-                </div>
-            </div>
-
-            <SmartForm Model="Form" OnValidSubmit="OnValidSubmit">
-                <div class="fv-row mb-8">
-                    <input @bind="Form.Username" type="text" placeholder="Username" class="form-control form-control-solid">
+            @if (ConfigService.Get().Authentication.DenyRegister)
+            {
+                <IconAlert Color="danger" Icon="bx-shield-quarter" Title="Sign up disabled">
+                    The administrator of this instance has disabled to sign up function<br />
+                    Back to <a href="/login">login</a>
+                </IconAlert>
+            }
+            else
+            {
+                <div class="text-center mb-8">
+                    <div class="fw-bold mb-3 fs-1">
+                        Register
+                    </div>
+                    <div class="text-gray-400 fw-semibold fs-4">
+                        Register in order to start managing your services
+                    </div>
                 </div>
+                
+                <SmartForm Model="Form" OnValidSubmit="OnValidSubmit">
+                    <div class="fv-row mb-8">
+                        <input @bind="Form.Username" type="text" placeholder="Username" class="form-control form-control-solid">
+                    </div>
 
-                <div class="fv-row mb-8">
-                    <input @bind="Form.Email" type="text" placeholder="Email" class="form-control form-control-solid">
-                </div>
+                    <div class="fv-row mb-8">
+                        <input @bind="Form.Email" type="text" placeholder="Email" class="form-control form-control-solid">
+                    </div>
 
-                <div class="fv-row mb-7">
-                    <input @bind="Form.Password" type="password" placeholder="Password" class="form-control form-control-solid">
-                </div>
+                    <div class="fv-row mb-7">
+                        <input @bind="Form.Password" type="password" placeholder="Password" class="form-control form-control-solid">
+                    </div>
 
-                <div class="fv-row mb-7">
-                    <input @bind="Form.RepeatedPassword" type="password" placeholder="Repeat your password" class="form-control form-control-solid">
-                </div>
+                    <div class="fv-row mb-7">
+                        <input @bind="Form.RepeatedPassword" type="password" placeholder="Repeat your password" class="form-control form-control-solid">
+                    </div>
 
-                <div class="d-flex flex-stack flex-wrap gap-3 fs-base fw-semibold mb-10">
-                    <div></div>
-                    <a href="/login" class="link-primary">
-                        Already have an account ?
-                    </a>
-                </div>
+                    <div class="d-flex flex-stack flex-wrap gap-3 fs-base fw-semibold mb-10">
+                        <div></div>
+                        <a href="/login" class="link-primary">
+                            Already have an account ?
+                        </a>
+                    </div>
 
-                <div class="d-flex flex-stack">
-                    <button type="submit" class="btn btn-primary me-2 flex-shrink-0">Sign Up</button>
-                    <div class="d-flex align-items-center">
-                        <div class="text-gray-400 fw-semibold fs-6 me-3 me-md-6">Or</div>
-                        @* OAuth2 Providers here *@
+                    <div class="d-flex flex-stack">
+                        <button type="submit" class="btn btn-primary me-2 flex-shrink-0">Sign Up</button>
+                        <div class="d-flex align-items-center">
+                            <div class="text-gray-400 fw-semibold fs-6 me-3 me-md-6">Or</div>
+                            @* OAuth2 Providers here *@
+                        </div>
                     </div>
-                </div>
-            </SmartForm>
+                </SmartForm>
+            }
         </div>
     </div>
 </div>
@@ -67,6 +80,9 @@
 
     private async Task OnValidSubmit()
     {
+        if (ConfigService.Get().Authentication.DenyRegister)
+            throw new DisplayException("The sign up function has been disabled");
+        
         if (Form.Password != Form.RepeatedPassword)
             throw new DisplayException("The passwords do not match");