Improve

modules/account/src/Volo.Abp.Account.Web/Pages/Account/Register.cshtml

@@ -12,20 +12,28 @@
             <a href="@Url.Page("./Login", new {returnUrl = Model.ReturnUrl, returnUrlHash = Model.ReturnUrlHash})" class="text-decoration-none">@L["Login"]</a>
         </strong>
         <form method="post" class="mt-4">
-            @if (!Model.IsExternalLogin)
+            @if (!Model.IsExternalLogin && Model.EnableLocalRegister)
             {
                 <abp-input asp-for="Input.UserName" auto-focus="true"/>
             }
+            
+            @if(Model.EnableLocalRegister || Model.IsExternalLogin)
+            {
+                 <abp-input asp-for="Input.EmailAddress"/>
+            }
 
-            <abp-input asp-for="Input.EmailAddress"/>
-
-            @if (!Model.IsExternalLogin)
+            @if (!Model.IsExternalLogin && Model.EnableLocalRegister)
             {
                 <abp-input asp-for="Input.Password"/>
             }
-            <div class="d-grid gap-2">
-                <abp-button button-type="Primary" type="submit" class="btn-lg mt-4">@L["Register"]</abp-button>
-            </div>
+            
+            @if(Model.EnableLocalRegister || Model.IsExternalLogin)
+            {
+                 <div class="d-grid gap-2">
+                     <abp-button button-type="Primary" type="submit" class="btn-lg mt-4">@L["Register"]</abp-button>
+                 </div>
+            }
+            
         </form>
         
         @if (!Model.IsExternalLogin && Model.VisibleExternalProviders.Any())

modules/account/src/Volo.Abp.Account.Web/Pages/Account/Register.cshtml.cs

@@ -38,6 +38,9 @@ public class RegisterModel : AccountPageModel
     
     public IEnumerable<ExternalProviderModel> ExternalProviders { get; set; }
     public IEnumerable<ExternalProviderModel> VisibleExternalProviders => ExternalProviders.Where(x => !string.IsNullOrWhiteSpace(x.DisplayName));
+    public bool EnableLocalRegister { get; set; }
+    public bool IsExternalLoginOnly => EnableLocalRegister == false && ExternalProviders?.Count() == 1;
+    public string ExternalLoginScheme => IsExternalLoginOnly ? ExternalProviders?.SingleOrDefault()?.AuthenticationScheme : null;
     
     protected IAuthenticationSchemeProvider SchemeProvider { get; }
     
@@ -55,13 +58,20 @@ public class RegisterModel : AccountPageModel
 
     public virtual async Task<IActionResult> OnGetAsync()
     {
-        if (!IsExternalLogin)
+        ExternalProviders = await GetExternalProviders();
+
+        if (!await CheckSelfRegistrationAsync())
         {
-            await CheckSelfRegistrationAsync();
+            if (!IsExternalLogin && IsExternalLoginOnly)
+            {
+                return await OnPostExternalLogin(ExternalLoginScheme);
+            }
+            
+            Alerts.Warning(L["SelfRegistrationDisabledMessage"]);
         }
         
         await TrySetEmailAsync();
-        ExternalProviders = await GetExternalProviders();
+        
         return Page();
     }
 
@@ -96,12 +106,12 @@ public class RegisterModel : AccountPageModel
     {
         try
         {
-            if (!IsExternalLogin)
+            ExternalProviders = await GetExternalProviders();
+
+            if (!await CheckSelfRegistrationAsync())
             {
-                await CheckSelfRegistrationAsync();
+                throw new UserFriendlyException(L["SelfRegistrationDisabledMessage"]);
             }
-            
-            ExternalProviders = await GetExternalProviders();
 
             if (IsExternalLogin)
             {
@@ -172,17 +182,27 @@ public class RegisterModel : AccountPageModel
         await SignInManager.SignInAsync(user, isPersistent: true, ExternalLoginAuthSchema);
     }
 
-    protected virtual async Task CheckSelfRegistrationAsync()
+    protected virtual async Task<bool> CheckSelfRegistrationAsync()
     {
-        if (!await SettingProvider.IsTrueAsync(AccountSettingNames.IsSelfRegistrationEnabled) ||
-            !await SettingProvider.IsTrueAsync(AccountSettingNames.EnableLocalLogin))
+        EnableLocalRegister = await SettingProvider.IsTrueAsync(AccountSettingNames.EnableLocalLogin) &&
+                              await SettingProvider.IsTrueAsync(AccountSettingNames.IsSelfRegistrationEnabled);
+
+        if (IsExternalLogin)
+        {
+            return true;
+        }
+        
+        if (!EnableLocalRegister)
         {
-            throw new UserFriendlyException(L["SelfRegistrationDisabledMessage"]);
+            return false;
         }
+
+        return true;
     }
     
     protected virtual async Task<List<ExternalProviderModel>> GetExternalProviders()
     {
+        
         var schemes = await SchemeProvider.GetAllSchemesAsync();
 
         return schemes
@@ -194,6 +214,15 @@ public class RegisterModel : AccountPageModel
             })
             .ToList();
     }
+    
+    protected virtual async Task<IActionResult> OnPostExternalLogin(string provider)
+    {
+        var redirectUrl = Url.Page("./Login", pageHandler: "ExternalLoginCallback", values: new { ReturnUrl, ReturnUrlHash });
+        var properties = SignInManager.ConfigureExternalAuthenticationProperties(provider, redirectUrl);
+        properties.Items["scheme"] = provider;
+
+        return await Task.FromResult(Challenge(properties, provider));
+    }
 
     public class PostInput
     {