Password Validity Data Annotation - gecko-8/devwiki GitHub Wiki

using <Project>.Entities;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Identity;
using System.ComponentModel.DataAnnotations;
using System.Linq;

namespace <Project>.Validation
{
    public class ValidPasswordAttribute : ValidationAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var httpContextAccessor = (IHttpContextAccessor)validationContext.GetService(typeof(IHttpContextAccessor));
            var userManager = (UserManager<User>)validationContext.GetService(typeof(UserManager<User>));
            var claimsPrincipal = httpContextAccessor.HttpContext.User;
            var user = userManager.GetUserAsync(claimsPrincipal).Result;

            // Check each available validator
            foreach(var validator in userManager.PasswordValidators)
            {
                var result = validator.ValidateAsync(userManager, user, (string)value).Result;
                if (!result.Succeeded)
                    return new ValidationResult(result.Errors.First().Description);
            }
            return ValidationResult.Success;
        }
    }
}

[ValidPassword]
public string Password { get; set; }