Error codes in user registration #12670

oguzhanagir created 2 months ago

Support Team

Hi @dominici,

Thanks for the details.

In ASP.NET Zero / ASP.NET Boilerplate, this behavior comes from how the registration flow handles ASP.NET Identity errors.

The DTO validation pipeline returns 400 Bad Request only when an AbpValidationException is thrown, for example from Data Annotations or custom ABP validation. However, password complexity checks are performed later by ASP.NET Identity when the user is created. The default helper used in the registration flow converts a failed IdentityResult into a UserFriendlyException, not an AbpValidationException.

In classic ASP.NET Boilerplate, UserFriendlyException is returned in the wrapped ABP error response with the user-facing message, but it is not treated as a validation exception, so the HTTP status is 500 by default. AbpValidationException is the exception type that produces 400 and fills error.validationErrors with field/member information.

If you want password policy errors to be returned as validation errors, customize the registration flow and convert the IdentityResult errors to AbpValidationException instead of calling the default CheckErrors(...) helper for this case.

Example shape:

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using Abp.Runtime.Validation;
using Microsoft.AspNetCore.Identity;

private static void CheckIdentityErrorsAsValidation(IdentityResult identityResult)
{
    if (identityResult.Succeeded)
    {
        return;
    }

    var validationErrors = identityResult.Errors
        .Select(error => new ValidationResult(
            error.Description,
            GetMembersForIdentityError(error)))
        .ToList();

    throw new AbpValidationException(
        "Method arguments are not valid! See ValidationErrors for details.",
        validationErrors);
}

private static IEnumerable<string> GetMembersForIdentityError(IdentityError error)
{
    return error.Code switch
    {
        nameof(IdentityErrorDescriber.PasswordTooShort) or
        nameof(IdentityErrorDescriber.PasswordRequiresDigit) or
        nameof(IdentityErrorDescriber.PasswordRequiresLower) or
        nameof(IdentityErrorDescriber.PasswordRequiresUpper) or
        nameof(IdentityErrorDescriber.PasswordRequiresNonAlphanumeric) or
        nameof(IdentityErrorDescriber.PasswordRequiresUniqueChars) => new[] { "Password" },

        nameof(IdentityErrorDescriber.DuplicateEmail) or
        nameof(IdentityErrorDescriber.InvalidEmail) => new[] { "EmailAddress" },

        nameof(IdentityErrorDescriber.DuplicateUserName) or
        nameof(IdentityErrorDescriber.InvalidUserName) => new[] { "UserName" },

        _ => Array.Empty<string>()
    };
}

Then use this custom method around the UserManager.CreateAsync(...) result in your registration implementation.

If you need localized ASP.NET Identity messages, localize the IdentityError descriptions in the same mapper before creating the ValidationResult. The important part is that the thrown exception must be AbpValidationException and each ValidationResult must include the related member name.

After this change, the response will be a 400 Bad Request and the ABP response body will include validation details similar to:

{
  "success": false,
  "error": {
    "message": "Your request is not valid!",
    "validationErrors": [
      {
        "message": "Passwords must be at least 8 characters.",
        "members": ["password"]
      }
    ]
  }
}

Alternatively, if the rule is static, you can put it directly on the input DTO with Data Annotations or custom ABP validation. For password complexity, this is usually dynamic per tenant/application setting, so converting the ASP.NET Identity result in the registration flow is generally the safer approach.

We do not recommend globally converting all UserFriendlyException responses to HTTP 400, because those exceptions are also used for non-validation business errors. Convert only the registration/identity validation failures that you want to expose as field-level validation errors.

Thank you

2 Answer(s)