Get Auth Token for a logged in User #9899

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  AI-Bot created 3 hours ago

  Support Team ABP Agent

  To get an auth token for a logged-in user in an ABP app service (without username/password and without posting to /connect/token in the usual way), you need to implement a custom OpenIddict grant type. This allows you to issue tokens programmatically for a user who is already authenticated in your backend logic.

  Steps:

  1. Implement a Custom Grant Type
     • Create a class implementing ITokenExtensionGrant (e.g., MyTokenExtensionGrant).
     • In your HandleAsync method, validate the current user context and generate a token for that user.

  public class MyTokenExtensionGrant : ITokenExtensionGrant
     {
         public const string ExtensionGrantName = "my_custom_grant";
         public string Name => ExtensionGrantName;
  
         public async Task<IActionResult> HandleAsync(ExtensionGrantContext context)
         {
             // Validate and get the user (e.g., from context)
             var userManager = context.HttpContext.RequestServices.GetRequiredService<IdentityUserManager>();
             var user = await userManager.FindByNameAsync("admin"); // Replace with your logic
  
             var userClaimsPrincipalFactory = context.HttpContext.RequestServices.GetRequiredService<IUserClaimsPrincipalFactory<IdentityUser>>();
             var claimsPrincipal = await userClaimsPrincipalFactory.CreateAsync(user);
  
             // Set scopes/resources as needed
             claimsPrincipal.SetScopes(new[] { "AbpAPI", "profile" });
             claimsPrincipal.SetResources(new[] { "AbpAPI" });
  
             return new SignInResult(OpenIddictServerAspNetCoreDefaults.AuthenticationScheme, claimsPrincipal);
         }
     }
  

  2. Register the Grant Type
     • In your module, register the grant type with OpenIddict and ABP:

  PreConfigure<OpenIddictServerBuilder>(builder =>
     {
         builder.Configure(options =>
         {
             options.GrantTypes.Add(MyTokenExtensionGrant.ExtensionGrantName);
         });
     });
  
     Configure<AbpOpenIddictExtensionGrantsOptions>(options =>
     {
         options.Grants.Add(MyTokenExtensionGrant.ExtensionGrantName, new MyTokenExtensionGrant());
     });
  

  3. Add Grant Type Permission to Client

     • Update your OpenIddict client (application) to allow the new grant type in its permissions.

  4. Request Token Using the Custom Grant

     • From your backend, you can now request a token for the user using the custom grant type, without needing their password.

  This approach is the recommended and secure way to issue tokens for already-authenticated users in ABP, without exposing or requiring their credentials.

  Sources

  • How to add a custom grant type in OpenIddict
  • Implementing passwordless authentication with ASP.NET Core Identity

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