feat: expose method to delete sid

OliverBooth/Services/ISessionService.cs

@@ -27,6 +27,13 @@ public interface ISessionService
     /// <exception cref="ArgumentNullException"><paramref name="session" /> is <see langword="null" />.</exception>
     void DeleteSession(ISession session);
 
+    /// <summary>
+    ///     Deletes the client's session cookie.
+    /// </summary>
+    /// <param name="response">The response to edit.</param>
+    /// <exception cref="ArgumentNullException"><paramref name="response" /> is <see langword="null" />.</exception>
+    IActionResult DeleteSessionCookie(HttpResponse response);
+
     /// <summary>
     ///     Saves a session cookie to the client's browser.
     /// </summary>

OliverBooth/Services/SessionService.cs

@@ -70,6 +70,13 @@ internal sealed class SessionService : BackgroundService, ISessionService
         context.SaveChanges();
     }
 
+    /// <inheritdoc />
+    public IActionResult DeleteSessionCookie(HttpResponse response)
+    {
+        response.Cookies.Delete("sid");
+        return new RedirectToPageResult("/Admin/Login");
+    }
+
     /// <inheritdoc />
     public void SaveSessionCookie(HttpResponse response, ISession session)
     {