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<form method="post"
      asp-action="Index"
      asp-controller="TestFileUpload"
      enctype="multipart/form-data">
    <input type="file" name="files" multiple />
    <input type="submit" value="Upload" />
</form>

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Index(IList<IFormFile> files)

public class TestFileUploadController : Controller
{
    private readonly IHostingEnvironment _environment;
    public TestFileUploadController(IHostingEnvironment environment)
    {
        _environment = environment;
    }

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Index(IList<IFormFile> files)
{
    var uploadsRootFolder = Path.Combine(_environment.WebRootPath, "uploads");
    if (!Directory.Exists(uploadsRootFolder))
    {
        Directory.CreateDirectory(uploadsRootFolder);
    }
 
    foreach (var file in files)
    {
        if (file == null || file.Length == 0)
        {
            continue;
        }
 
        var filePath = Path.Combine(uploadsRootFolder, file.FileName);
        using (var fileStream = new FileStream(filePath, FileMode.Create))
        {
            await file.CopyToAsync(fileStream).ConfigureAwait(false);
        }
    }
    return View();
}

public class UserViewModel
{
    [Required(ErrorMessage = "Please select a file.")]
    [DataType(DataType.Upload)]
    public IFormFile Photo { get; set; }
}

@model UserViewModel
 
<form method="post"
      asp-action="UploadPhoto"
      asp-controller="TestFileUpload"
      enctype="multipart/form-data">
    <div asp-validation-summary="ModelOnly" class="text-danger"></div>
 
    <input asp-for="Photo" />
    <span asp-validation-for="Photo" class="text-danger"></span>
    <input type="submit" value="Upload"/>
</form>

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> UploadPhoto(UserViewModel userViewModel)
{
    if (ModelState.IsValid)
    {
        var formFile = userViewModel.Photo;
        if (formFile == null || formFile.Length == 0)
        {
            ModelState.AddModelError("", "Uploaded file is empty or null.");
            return View(viewName: "Index");
        }
 
        var uploadsRootFolder = Path.Combine(_environment.WebRootPath, "uploads");
        if (!Directory.Exists(uploadsRootFolder))
        {
            Directory.CreateDirectory(uploadsRootFolder);
        }
 
        var filePath = Path.Combine(uploadsRootFolder, formFile.FileName);
        using (var fileStream = new FileStream(filePath, FileMode.Create))
        {
            await formFile.CopyToAsync(fileStream).ConfigureAwait(false);
        }
 
        RedirectToAction("Index");
    }
    return View(viewName: "Index");
}

 [FileExtensions(Extensions = ".png,.jpg,.jpeg,.gif", ErrorMessage = "Please upload an image file.")]

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
public class UploadFileExtensionsAttribute : ValidationAttribute
{
    private readonly IList<string> _allowedExtensions;
    public UploadFileExtensionsAttribute(string fileExtensions)
    {
        _allowedExtensions = fileExtensions.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries).ToList();
    }
 
    public override bool IsValid(object value)
    {
        var file = value as IFormFile;
        if (file != null)
        {
            return isValidFile(file);
        }
 
        var files = value as IList<IFormFile>;
        if (files == null)
        {
            return false;
        }
 
        foreach (var postedFile in files)
        {
            if (!isValidFile(postedFile)) return false;
        }
 
        return true;
    }
 
    private bool isValidFile(IFormFile file)
    {
        if (file == null || file.Length == 0)
        {
            return false;
        }
 
        var fileExtension = Path.GetExtension(file.FileName);
        return !string.IsNullOrWhiteSpace(fileExtension) &&
               _allowedExtensions.Any(ext => fileExtension.Equals(ext, StringComparison.OrdinalIgnoreCase));
    }
}

public class UserViewModel
{
    [Required(ErrorMessage = "Please select a file.")]
    //`FileExtensions` needs to be applied to a string property. It doesn't work on IFormFile properties, and definitely not on IEnumerable<IFormFile> properties.
    //[FileExtensions(Extensions = ".png,.jpg,.jpeg,.gif", ErrorMessage = "Please upload an image file.")]
    [UploadFileExtensions(".png,.jpg,.jpeg,.gif", ErrorMessage = "Please upload an image file.")]
    [DataType(DataType.Upload)]
    public IFormFile Photo { get; set; }
}

namespace DNT.IDP.DomainClasses
{
    public class User
    {
        [Key]
        [MaxLength(50)]       
        public string SubjectId { get; set; }
    
        [MaxLength(100)]
        [Required]
        public string Username { get; set; }

        [MaxLength(100)]
        public string Password { get; set; }

        [Required]
        public bool IsActive { get; set; }

        public ICollection<UserClaim> UserClaims { get; set; }

        public ICollection<UserLogin> UserLogins { get; set; }
    }
}

namespace DNT.IDP.DomainClasses
{
    public class UserClaim
    {         
        public int Id { get; set; }

        [MaxLength(50)]
        [Required]
        public string SubjectId { get; set; }
        
        public User User { get; set; }

        [Required]
        [MaxLength(250)]
        public string ClaimType { get; set; }

        [Required]
        [MaxLength(250)]
        public string ClaimValue { get; set; }
    }
}

namespace DNT.IDP.DomainClasses
{
    public class UserLogin
    {
        public int Id { get; set; }

        [MaxLength(50)]
        [Required]
        public string SubjectId { get; set; }
        
        public User User { get; set; }

        [Required]
        [MaxLength(250)]
        public string LoginProvider { get; set; }

        [Required]
        [MaxLength(250)]
        public string ProviderKey { get; set; }
    }
}

    public interface IUsersService
    {
        Task<bool> AreUserCredentialsValidAsync(string username, string password);
        Task<User> GetUserByEmailAsync(string email);
        Task<User> GetUserByProviderAsync(string loginProvider, string providerKey);
        Task<User> GetUserBySubjectIdAsync(string subjectId);
        Task<User> GetUserByUsernameAsync(string username);
        Task<IEnumerable<UserClaim>> GetUserClaimsBySubjectIdAsync(string subjectId);
        Task<IEnumerable<UserLogin>> GetUserLoginsBySubjectIdAsync(string subjectId);
        Task<bool> IsUserActiveAsync(string subjectId);
        Task AddUserAsync(User user);
        Task AddUserLoginAsync(string subjectId, string loginProvider, string providerKey);
        Task AddUserClaimAsync(string subjectId, string claimType, string claimValue);
    }

@using DNT.IDP.Controllers.Account;
@using DNT.IDP.Controllers.Consent;
@using DNT.IDP.Controllers.Grants;
@using DNT.IDP.Controllers.Home;
@using DNT.IDP.Controllers.Diagnostics;
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

 public static class IdentityServerBuilderExtensions
 {
        public static IIdentityServerBuilder AddTestUsers(this IIdentityServerBuilder builder, List<TestUser> users)
        {
            builder.Services.AddSingleton(new TestUserStore(users));
            builder.AddProfileService<TestUserProfileService>();
            builder.AddResourceOwnerValidator<TestUserResourceOwnerPasswordValidator>();

            return builder;
        }
}

using DNT.IDP.Services;
using Microsoft.Extensions.DependencyInjection;

namespace DNT.IDP
{
    public static class IdentityServerBuilderExtensions
    {
        public static IIdentityServerBuilder AddCustomUserStore(this IIdentityServerBuilder builder)
        {
            // builder.Services.AddScoped<IUsersService, UsersService>();
            builder.AddProfileService<CustomUserProfileService>();
            return builder;
        }
    }
}

namespace DNT.IDP.Services
{
    public class CustomUserProfileService : IProfileService
    {
        private readonly IUsersService _usersService;

        public CustomUserProfileService(IUsersService usersService)
        {
            _usersService = usersService;
        }

        public async Task GetProfileDataAsync(ProfileDataRequestContext context)
        {
            var subjectId = context.Subject.GetSubjectId();
            var claimsForUser = await _usersService.GetUserClaimsBySubjectIdAsync(subjectId);
            context.IssuedClaims = claimsForUser.Select(c => new Claim(c.ClaimType, c.ClaimValue)).ToList();
        }

        public async Task IsActiveAsync(IsActiveContext context)
        {
            var subjectId = context.Subject.GetSubjectId();
            context.IsActive = await _usersService.IsUserActiveAsync(subjectId);
        }
    }
}

namespace DNT.IDP
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddIdentityServer()
             .AddDeveloperSigningCredential()
             .AddCustomUserStore()
             .AddInMemoryIdentityResources(Config.GetIdentityResources())
             .AddInMemoryApiResources(Config.GetApiResources())
             .AddInMemoryClients(Config.GetClients());

        public AccountController(
            IIdentityServerInteractionService interaction,
            IClientStore clientStore,
            IAuthenticationSchemeProvider schemeProvider,
            IEventService events,
            TestUserStore users = null)
        {
            _users = users ?? new TestUserStore(TestUsers.Users);

            _interaction = interaction;
            _clientStore = clientStore;
            _schemeProvider = schemeProvider;
            _events = events;
        }

        private readonly TestUserStore _users;
        private readonly IUsersService _usersService;
        public AccountController(
    // ...
            IUsersService usersService)
        {
            _usersService = usersService;
    // ...
        }

        public async Task<IActionResult> Login(LoginInputModel model, string button)
        {
    //...
            if (ModelState.IsValid)
            {
                if (await _usersService.AreUserCredentialsValidAsync(model.Username, model.Password))
                {
                    var user = await _usersService.GetUserByUsernameAsync(model.Username);

    public class RegisterUserViewModel
    {
        // credentials       
        [MaxLength(100)]
        public string Username { get; set; }

        [MaxLength(100)]
        public string Password { get; set; }

    public class RegisterUserViewModel
    {
   // ...

        // claims 
        [Required]
        [MaxLength(100)]
        public string Firstname { get; set; }

        [Required]
        [MaxLength(100)]
        public string Lastname { get; set; }

        [Required]
        [MaxLength(150)]
        public string Email { get; set; }

        [Required]
        [MaxLength(200)]
        public string Address { get; set; }

        [Required]
        [MaxLength(2)]
        public string Country { get; set; }

varuserToCreate=newUser
{
  Password=model.Password.GetSha256Hash(),
  Username=model.Username,
  IsActive=true
};
userToCreate.UserClaims.Add(newUserClaim("country",model.Country));
userToCreate.UserClaims.Add(newUserClaim("address",model.Address));
userToCreate.UserClaims.Add(newUserClaim("given_name",model.Firstname));
userToCreate.UserClaims.Add(newUserClaim("family_name",model.Lastname));
userToCreate.UserClaims.Add(newUserClaim("email",model.Email));
userToCreate.UserClaims.Add(newUserClaim("subscriptionlevel","FreeUser"));

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