oliverbooth.dev/OliverBooth/Data/Blog/User.cs

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C#
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using System.ComponentModel.DataAnnotations.Schema;
using System.Security.Cryptography;
using System.Text;
using Cysharp.Text;
namespace OliverBooth.Data.Blog;
/// <summary>
/// Represents a user.
/// </summary>
internal sealed class User : IUser, IBlogAuthor
{
/// <inheritdoc cref="IUser.AvatarUrl" />
[NotMapped]
public Uri AvatarUrl => GetAvatarUrl();
/// <inheritdoc />
public string EmailAddress { get; set; } = string.Empty;
/// <inheritdoc cref="IUser.DisplayName" />
public string DisplayName { get; set; } = string.Empty;
/// <inheritdoc cref="IUser.Id" />
public Guid Id { get; private set; } = Guid.NewGuid();
/// <inheritdoc />
public DateTimeOffset Registered { get; private set; } = DateTimeOffset.UtcNow;
/// <summary>
/// Gets or sets the password hash.
/// </summary>
/// <value>The password hash.</value>
internal string Password { get; set; } = string.Empty;
/// <summary>
/// Gets or sets the salt used to hash the password.
/// </summary>
/// <value>The salt used to hash the password.</value>
internal string Salt { get; set; } = string.Empty;
/// <inheritdoc cref="IUser.GetAvatarUrl" />
public Uri GetAvatarUrl(int size = 28)
{
if (string.IsNullOrWhiteSpace(EmailAddress))
{
return new Uri($"https://www.gravatar.com/avatar/0?size={size}");
}
ReadOnlySpan<char> span = EmailAddress.AsSpan();
int byteCount = Encoding.UTF8.GetByteCount(span);
Span<byte> bytes = stackalloc byte[byteCount];
Encoding.UTF8.GetBytes(span, bytes);
Span<byte> hash = stackalloc byte[16];
MD5.TryHashData(bytes, hash, out _);
using Utf8ValueStringBuilder builder = ZString.CreateUtf8StringBuilder();
Span<char> hex = stackalloc char[2];
for (var index = 0; index < hash.Length; index++)
{
if (hash[index].TryFormat(hex, out _, "x2")) builder.Append(hex);
else builder.Append("00");
}
return new Uri($"https://www.gravatar.com/avatar/{builder}?size={size}");
}
/// <inheritdoc />
public bool TestCredentials(string password)
{
return false;
}
}