implement single logout for OIDC

Oqtane.Client/Modules/Admin/Users/Index.razor

@@ -329,6 +329,15 @@ else
                                         </select>
                                     </div>
                                 </div>
+                                <div class="row mb-1 align-items-center">
+                                    <Label Class="col-sm-3" For="singlelogout" HelpText="Specify if users should be logged out of both the application and provider (the default is false indicating they will only be logged out of the application)" ResourceKey="SingleLogout">Use Single Logout?</Label>
+                                    <div class="col-sm-9">
+                                        <select id="singlelogout" class="form-select" @bind="@_singlelogout" required>
+                                            <option value="true">@SharedLocalizer["Yes"]</option>
+                                            <option value="false">@SharedLocalizer["No"]</option>
+                                        </select>
+                                    </div>
+                                </div>
                             }
                             <div class="row mb-1 align-items-center">
                                 <Label Class="col-sm-3" For="scopes" HelpText="A list of Scopes to request from the provider (separated by commas). If none are specified, standard Scopes will be used by default." ResourceKey="Scopes">Scopes:</Label>
@@ -560,6 +569,7 @@ else
     private string _toggleclientsecret = string.Empty;
     private string _authresponsetype;
     private string _requirenonce;
+    private string _singlelogout;
     private string _scopes;
     private string _parameters;
     private string _pkce;
@@ -648,6 +658,7 @@ else
         _toggleclientsecret = SharedLocalizer["ShowPassword"];
         _authresponsetype = SettingService.GetSetting(settings, "ExternalLogin:AuthResponseType", "code");
         _requirenonce = SettingService.GetSetting(settings, "ExternalLogin:RequireNonce", "true");
+        _singlelogout = SettingService.GetSetting(settings, "ExternalLogin:SingleLogout", "false");
         _scopes = SettingService.GetSetting(settings, "ExternalLogin:Scopes", "");
         _parameters = SettingService.GetSetting(settings, "ExternalLogin:Parameters", "");
         _pkce = SettingService.GetSetting(settings, "ExternalLogin:PKCE", "false");
@@ -771,6 +782,7 @@ else
                 settings = SettingService.SetSetting(settings, "ExternalLogin:ClientSecret", _clientsecret, true);
                 settings = SettingService.SetSetting(settings, "ExternalLogin:AuthResponseType", _authresponsetype, true);
                 settings = SettingService.SetSetting(settings, "ExternalLogin:RequireNonce", _requirenonce, true);
+                settings = SettingService.SetSetting(settings, "ExternalLogin:SingleLogout", _singlelogout, true);
                 settings = SettingService.SetSetting(settings, "ExternalLogin:Scopes", _scopes, true);
                 settings = SettingService.SetSetting(settings, "ExternalLogin:Parameters", _parameters, true);
                 settings = SettingService.SetSetting(settings, "ExternalLogin:PKCE", _pkce, true);

Oqtane.Client/Resources/Modules/Admin/Users/Index.resx

@@ -555,4 +555,10 @@
   <data name="CookieDomain.HelpText" xml:space="preserve">
     <value>If you would like to share cookies across subdomains you will need to specify a root domain with a leading dot (ie. '.example.com')</value>
   </data>
+  <data name="SingleLogout.Text" xml:space="preserve">
+    <value>Allow Single Logout?</value>
+  </data>
+  <data name="SingleLogout.HelpText" xml:space="preserve">
+    <value>Specify if users should be logged out of both the application and provider (the default is false indicating they will only be logged out of the application)</value>
+  </data>
 </root>

Oqtane.Server/Pages/Logout.cshtml.cs

@@ -1,5 +1,8 @@
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.RazorPages;
@@ -8,6 +11,7 @@ using Oqtane.Extensions;
 using Oqtane.Infrastructure;
 using Oqtane.Managers;
 using Oqtane.Shared;
+using Radzen.Blazor.Markdown;
 
 namespace Oqtane.Pages
 {
@@ -28,6 +32,9 @@ namespace Oqtane.Pages
 
         public async Task<IActionResult> OnPostAsync(string returnurl, string everywhere)
         {
+            returnurl = (returnurl == null) ? "/" : returnurl;
+            returnurl = (!returnurl.StartsWith("/")) ? "/" + returnurl : returnurl;
+
             if (HttpContext.User != null)
             {
                 var alias = HttpContext.GetAlias();
@@ -43,13 +50,25 @@ namespace Oqtane.Pages
                     _logger.Log(LogLevel.Information, this, LogFunction.Security, "User Logout For Username {Username}", user.Username);
                 }
 
-                await HttpContext.SignOutAsync(Constants.AuthenticationScheme);
+                var authenticationProperties = new AuthenticationProperties
+                {
+                    RedirectUri = returnurl 
+                };
+
+                var authenticationSchemes = new List<string>();
+                authenticationSchemes.Add(Constants.AuthenticationScheme);
+                if (HttpContext.GetSiteSettings().GetValue("ExternalLogin:ProviderType", "") == AuthenticationProviderTypes.OpenIDConnect &&
+                    HttpContext.GetSiteSettings().GetValue("ExternalLogin:SingleLogout", "false") == "true")
+                {
+                    authenticationSchemes.Add(AuthenticationProviderTypes.OpenIDConnect);
+                }
+
+                return SignOut(authenticationProperties, authenticationSchemes.ToArray());
+            }
+            else
+            {
+                return LocalRedirect(Url.Content("~" + returnurl));
             }
-
-            returnurl = (returnurl == null) ? "/" : returnurl;
-            returnurl = (!returnurl.StartsWith("/")) ? "/" + returnurl : returnurl;
-
-            return LocalRedirect(Url.Content("~" + returnurl));
         }
     }
 }