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To handle impersonation in an Asp.Net Core Intranet application for Windows-Identity, the following steps can be followed:

1. Enable Windows Authentication: In the Startup.cs file of the application, add the following code in the ConfigureServices method to enable Windows Authentication:

   services.AddAuthentication(IISDefaults.AuthenticationScheme);
   

2. Add Impersonation Middleware: In the same file, add a middleware component to handle impersonation. This middleware should check if the user is authenticated and has the required permission to impersonate another user. If the user is allowed to impersonate, the middleware should create a new WindowsIdentity object for the impersonated user and set it as the current principal. Here's an example middleware component:

   public class ImpersonationMiddleware
   {
       private readonly RequestDelegate _next;
   
       public ImpersonationMiddleware(RequestDelegate next)
       {
           _next = next;
       }
   
       public async Task Invoke(HttpContext context)
       {
           // Check if the user is authenticated and authorized to impersonate
           if (context.User.Identity.IsAuthenticated && context.User.IsInRole("Impersonate"))
           {
               // Get the username of the user to impersonate
               var impersonatedUserName = context.Request.Query["impersonate"];
   
               // Create a new WindowsIdentity object for the impersonated user
               var impersonatedIdentity = new WindowsIdentity(impersonatedUserName);
   
               // Set the impersonated identity as the current principal
               var impersonationContext = impersonatedIdentity.Impersonate();
               Thread.CurrentPrincipal = new WindowsPrincipal(impersonatedIdentity);
   
               // Add the impersonation context to the request user data
               context.Items["ImpersonationContext"] = impersonationContext;
           }
   
           await _next(context);
       }
   }
   

3. Register the Middleware: In the Configure method of the Startup.cs file, add the following code to register the middleware:

   app.UseMiddleware<ImpersonationMiddleware>();
   

With these steps, the Asp.Net Core Intranet application for Windows-Identity can use middleware to handle impersonation.