添加项目文件。

StoreHub.Framework/Security/OnlineUserStore.cs

@@ -0,0 +1,80 @@
+using Microsoft.Extensions.Caching.Memory;
+using System.Collections.Concurrent;
+
+namespace StoreHub.Framework.Security;
+
+/// <summary>
+/// 基于 <see cref="IMemoryCache"/> 的在线用户会话存储。
+/// </summary>
+public class OnlineUserStore : IOnlineUserStore
+{
+	private const string CacheKeyPrefix = "online:user:";
+	private readonly IMemoryCache _cache;
+	// 在线人员索引：IMemoryCache 不提供公共枚举 API，这里用字典维护便于查询在线列表
+	private readonly ConcurrentDictionary<int, OnlineUserInfo> _onlineIndex = new();
+
+	public OnlineUserStore(IMemoryCache cache)
+	{
+		_cache = cache;
+	}
+
+	/// <inheritdoc />
+	public void SignIn(OnlineUserInfo info)
+	{
+		ArgumentNullException.ThrowIfNull(info);
+
+		// 以 userId 为键覆盖写入：旧会话（jti）被顶替，实现单点登录
+		_cache.Set(GetKey(info.UserId), info, new MemoryCacheEntryOptions
+		{
+			// 缓存条目与令牌同时过期，过期后自动失效
+			AbsoluteExpiration = info.ExpiresAt,
+		});
+		_onlineIndex[info.UserId] = info;
+	}
+
+	/// <inheritdoc />
+	public bool IsTokenActive(int userId, string jti)
+	{
+		if (string.IsNullOrWhiteSpace(jti))
+		{
+			return false;
+		}
+
+		return _cache.TryGetValue(GetKey(userId), out OnlineUserInfo? info)
+			&& info is not null
+			&& string.Equals(info.Jti, jti, StringComparison.Ordinal);
+	}
+
+	/// <inheritdoc />
+	public void SignOut(int userId)
+	{
+		_cache.Remove(GetKey(userId));
+		_onlineIndex.TryRemove(userId, out _);
+	}
+
+	/// <inheritdoc />
+	public IReadOnlyList<OnlineUserInfo> GetOnlineUsers()
+	{
+		DateTime now = DateTime.Now;
+		List<OnlineUserInfo> result = [];
+		foreach (KeyValuePair<int, OnlineUserInfo> pair in _onlineIndex)
+		{
+			if (pair.Value.ExpiresAt > now)
+			{
+				result.Add(pair.Value);
+			}
+			else
+			{
+				_onlineIndex.TryRemove(pair.Key, out _);
+			}
+		}
+
+		return result;
+	}
+
+	/// <inheritdoc />
+	public int Count => GetOnlineUsers().Count;
+
+	private static string GetKey(int userId) => $"{CacheKeyPrefix}{userId}";
+}
+