/
UserValidator.cs
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/
UserValidator.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
namespace Microsoft.AspNetCore.Identity;
/// <summary>
/// Provides validation services for user classes.
/// </summary>
/// <typeparam name="TUser">The type encapsulating a user.</typeparam>
public class UserValidator<TUser> : IUserValidator<TUser> where TUser : class
{
/// <summary>
/// Creates a new instance of <see cref="UserValidator{TUser}"/>.
/// </summary>
/// <param name="errors">The <see cref="IdentityErrorDescriber"/> used to provider error messages.</param>
public UserValidator(IdentityErrorDescriber? errors = null)
{
Describer = errors ?? new IdentityErrorDescriber();
}
/// <summary>
/// Gets the <see cref="IdentityErrorDescriber"/> used to provider error messages for the current <see cref="UserValidator{TUser}"/>.
/// </summary>
/// <value>The <see cref="IdentityErrorDescriber"/> used to provider error messages for the current <see cref="UserValidator{TUser}"/>.</value>
public IdentityErrorDescriber Describer { get; private set; }
/// <summary>
/// Validates the specified <paramref name="user"/> as an asynchronous operation.
/// </summary>
/// <param name="manager">The <see cref="UserManager{TUser}"/> that can be used to retrieve user properties.</param>
/// <param name="user">The user to validate.</param>
/// <returns>The <see cref="Task"/> that represents the asynchronous operation, containing the <see cref="IdentityResult"/> of the validation operation.</returns>
public virtual async Task<IdentityResult> ValidateAsync(UserManager<TUser> manager, TUser user)
{
if (manager == null)
{
throw new ArgumentNullException(nameof(manager));
}
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
var errors = new List<IdentityError>();
await ValidateUserName(manager, user, errors).ConfigureAwait(false);
if (manager.Options.User.RequireUniqueEmail)
{
await ValidateEmail(manager, user, errors).ConfigureAwait(false);
}
return errors.Count > 0 ? IdentityResult.Failed(errors.ToArray()) : IdentityResult.Success;
}
private async Task ValidateUserName(UserManager<TUser> manager, TUser user, ICollection<IdentityError> errors)
{
var userName = await manager.GetUserNameAsync(user).ConfigureAwait(false);
if (string.IsNullOrWhiteSpace(userName))
{
errors.Add(Describer.InvalidUserName(userName));
}
else if (!string.IsNullOrEmpty(manager.Options.User.AllowedUserNameCharacters) &&
userName.Any(c => !manager.Options.User.AllowedUserNameCharacters.Contains(c)))
{
errors.Add(Describer.InvalidUserName(userName));
}
else
{
var owner = await manager.FindByNameAsync(userName).ConfigureAwait(false);
if (owner != null &&
!string.Equals(await manager.GetUserIdAsync(owner).ConfigureAwait(false), await manager.GetUserIdAsync(user).ConfigureAwait(false)))
{
errors.Add(Describer.DuplicateUserName(userName));
}
}
}
// make sure email is not empty, valid, and unique
private async Task ValidateEmail(UserManager<TUser> manager, TUser user, List<IdentityError> errors)
{
var email = await manager.GetEmailAsync(user).ConfigureAwait(false);
if (string.IsNullOrWhiteSpace(email))
{
errors.Add(Describer.InvalidEmail(email));
return;
}
if (!new EmailAddressAttribute().IsValid(email))
{
errors.Add(Describer.InvalidEmail(email));
return;
}
var owner = await manager.FindByEmailAsync(email).ConfigureAwait(false);
if (owner != null &&
!string.Equals(await manager.GetUserIdAsync(owner).ConfigureAwait(false), await manager.GetUserIdAsync(user).ConfigureAwait(false)))
{
errors.Add(Describer.DuplicateEmail(email));
}
}
}