如何在.net核心应用中使用中间件来操作当前token的ClaimsIdentity？

public class TokenMiddleware
{
    private readonly RequestDelegate _next;

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

    public async Task InvokeAsync(HttpContext context)
    {
        // 从请求头中获取Token
        var token = context.Request.Headers["Authorization"].FirstOrDefault()?.Split(" ").Last();

        if (!string.IsNullOrEmpty(token))
        {
            try
            {
                // 解析Token并更新ClaimsIdentity
                var claimsPrincipal = ValidateTokenAndGetClaimsPrincipal(token);
                context.User = claimsPrincipal;
            }
            catch (Exception ex)
            {
                // 处理Token验证失败的情况
                context.Response.StatusCode = StatusCodes.Status401Unauthorized;
                return;
            }
        }

        await _next(context);
    }

    private ClaimsPrincipal ValidateTokenAndGetClaimsPrincipal(string token)
    {
        // 这里应该包含Token验证逻辑，例如使用JWT库
        // 假设验证成功，返回一个包含Claims的ClaimsPrincipal对象
        var claims = new List<Claim>
        {
            new Claim(ClaimTypes.Name, "username"),
            // 添加其他Claims...
        };

        var identity = new ClaimsIdentity(claims, "Bearer");
        var principal = new ClaimsPrincipal(identity);
        return principal;
    }
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseRouting();

    // 使用自定义的Token中间件
    app.UseMiddleware<TokenMiddleware>();

    app.UseAuthentication();
    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}