110 lines
3.2 KiB
C#
110 lines
3.2 KiB
C#
using System.ComponentModel.DataAnnotations.Schema;
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using System.Security.Cryptography;
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using System.Text;
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using Cysharp.Text;
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using OliverBooth.Data.Blog;
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using OtpNet;
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namespace OliverBooth.Data.Web;
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/// <summary>
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/// Represents a user.
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/// </summary>
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internal sealed class User : IUser, IBlogAuthor
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{
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/// <inheritdoc cref="IUser.AvatarUrl" />
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[NotMapped]
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public Uri AvatarUrl => GetAvatarUrl();
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/// <inheritdoc />
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public string EmailAddress { get; set; } = string.Empty;
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/// <inheritdoc cref="IUser.DisplayName" />
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public string DisplayName { get; set; } = string.Empty;
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/// <inheritdoc cref="IUser.Id" />
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public Guid Id { get; private set; } = Guid.NewGuid();
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/// <inheritdoc />
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public IReadOnlyList<Permission> Permissions { get; private set; } = ArraySegment<Permission>.Empty;
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/// <inheritdoc />
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public DateTimeOffset Registered { get; private set; } = DateTimeOffset.UtcNow;
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/// <inheritdoc />
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public string? Totp { get; private set; }
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/// <summary>
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/// Gets or sets the password hash.
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/// </summary>
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/// <value>The password hash.</value>
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internal string Password { get; set; } = string.Empty;
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/// <summary>
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/// Gets or sets the salt used to hash the password.
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/// </summary>
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/// <value>The salt used to hash the password.</value>
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internal string Salt { get; set; } = string.Empty;
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/// <inheritdoc cref="IUser.GetAvatarUrl" />
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public Uri GetAvatarUrl(int size = 28)
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{
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if (string.IsNullOrWhiteSpace(EmailAddress))
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{
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return new Uri($"https://www.gravatar.com/avatar/0?size={size}");
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}
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ReadOnlySpan<char> span = EmailAddress.AsSpan();
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int byteCount = Encoding.UTF8.GetByteCount(span);
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Span<byte> bytes = stackalloc byte[byteCount];
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Encoding.UTF8.GetBytes(span, bytes);
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Span<byte> hash = stackalloc byte[16];
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MD5.TryHashData(bytes, hash, out _);
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using Utf8ValueStringBuilder builder = ZString.CreateUtf8StringBuilder();
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Span<char> hex = stackalloc char[2];
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for (var index = 0; index < hash.Length; index++)
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{
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if (hash[index].TryFormat(hex, out _, "x2"))
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{
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builder.Append(hex);
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}
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else
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{
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builder.Append("00");
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}
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}
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return new Uri($"https://www.gravatar.com/avatar/{builder}?size={size}");
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}
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/// <inheritdoc />
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public bool HasPermission(Permission permission)
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{
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return HasPermission(permission.Name);
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}
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/// <inheritdoc />
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public bool HasPermission(string permission)
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{
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return (Permissions.Any(p => p.IsAllowed && p.Name == permission) ||
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Permissions.Any(p => p is { IsAllowed: true, Name: "*" })) &&
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!Permissions.Any(p => !p.IsAllowed && p.Name == permission);
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}
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/// <inheritdoc />
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public bool TestCredentials(string password)
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{
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return false;
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}
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/// <inheritdoc />
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public bool TestTotp(string value)
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{
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byte[]? key = Base32Encoding.ToBytes(Totp);
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var totp = new Totp(key);
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return totp.VerifyTotp(value, out _, VerificationWindow.RfcSpecifiedNetworkDelay);
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}
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}
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