Csharp 如何在用户在线时限制令牌生成

对于用户跟踪: 您可以在数据库中创建一个表来存储有关活动用户会话的信息.该表应包括UserID、Token、LastActivityTime等字段.

CREATE TABLE ActiveSessions (
    Id INT PRIMARY KEY IDENTITY(1,1),
    UserId INT,
    Token NVARCHAR(MAX),
    LastActivityTime DATETIME
);

然后是用于跟踪的中间件: 这用于跟踪用户活动并更新数据库中的LastActivityTime.

public class SessionTrackingMiddleware
{
    private readonly RequestDelegate _next;

    public SessionTrackingMiddleware(RequestDelegate next)
    {
        _next = next;
    }

    public async Task Invoke(HttpContext context, YourDbContext dbContext)
    {
        // Update the LastActivityTime in the database for the current user session
        // You need to extract UserId and Token from the JWT or other authentication mechanism
        var userId = GetUserIdFromContext(context); 
        var token = GetTokenFromContext(context);

        var session = dbContext.ActiveSessions.FirstOrDefault(s => s.UserId == userId && s.Token == token);
        if (session != null)
        {
            session.LastActivityTime = DateTime.Now;
            dbContext.SaveChanges();
        }

        await _next(context);
    }
}

然后，您可以编写用于限制并发登录的类.并确保在Startup.cs的Configure方法中注册了SessionTrackingMiddleware.

app.UseMiddleware<SessionTrackingMiddleware>();