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// SPDX-FileCopyrightText: 2026 Progmasoft <support@progmasoft.com>
// SPDX-License-Identifier: AGPL-3.0-or-later WITH AdditionRef-Progmasoft-Patent-Grant-1.1
using System.Security.Cryptography;
using Microsoft.Extensions.Options;
namespace Progmasoft.Progmaweb.Api.Accounts;
internal sealed class AccountSessionOptions
{
public const string SectionName = "AccountSessions";
public int LifetimeHours { get; init; } = 12;
public string CookieName { get; init; } = "__Host-ProgmasoftSession";
}
internal sealed class SessionService(
IAccountStore store,
TimeProvider timeProvider,
IOptions<AccountSessionOptions> options)
{
private readonly AccountSessionOptions settings = options.Value;
public async ValueTask<AuthenticatedAccount> CreateAsync(AccountRecord account, CancellationToken cancellationToken)
{
byte[] tokenBytes = RandomNumberGenerator.GetBytes(32);
string token = Convert.ToBase64String(tokenBytes)
.Replace('+', '-')
.Replace('/', '_')
.TrimEnd('=');
byte[] digest = SHA256.HashData(System.Text.Encoding.ASCII.GetBytes(token));
DateTimeOffset createdAt = timeProvider.GetUtcNow();
DateTimeOffset expiresAt = createdAt.AddHours(Math.Clamp(settings.LifetimeHours, 1, 168));
await store.StoreSessionAsync(new SessionRecord(digest, account.Id, createdAt, expiresAt), cancellationToken);
return new AuthenticatedAccount(account, token, expiresAt);
}
public async ValueTask<AccountRecord?> AuthenticateAsync(string? token, CancellationToken cancellationToken)
{
if (!TryDigest(token, out byte[] digest))
{
return null;
}
SessionRecord? session = await store.FindSessionAsync(digest, cancellationToken);
if (session is null)
{
return null;
}
if (session.ExpiresAt <= timeProvider.GetUtcNow())
{
await store.RevokeSessionAsync(digest, cancellationToken);
return null;
}
return await store.FindByIdAsync(session.AccountId, cancellationToken);
}
public async ValueTask RevokeAsync(string? token, CancellationToken cancellationToken)
{
if (TryDigest(token, out byte[] digest))
{
await store.RevokeSessionAsync(digest, cancellationToken);
}
}
public static CookieOptions CreateCookieOptions(DateTimeOffset expiresAt) => new()
{
Expires = expiresAt,
HttpOnly = true,
IsEssential = true,
Path = "/",
SameSite = SameSiteMode.Lax,
Secure = true
};
public string CookieName => settings.CookieName;
private static bool TryDigest(string? token, out byte[] digest)
{
digest = [];
if (token is null || token.Length is < 40 or > 64 || token.Any(character =>
!(char.IsAsciiLetterOrDigit(character) || character is '-' or '_')))
{
return false;
}
digest = SHA256.HashData(System.Text.Encoding.ASCII.GetBytes(token));
return true;
}
}
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