如何为另一个ASP.Net用户生成令牌

Question

在我们的网站（ASP.Net MVP 4.7）中，我们希望管理员能够添加Api用户并为此用户生成令牌，而不必以Api用户身份登录。

由于将永远不会使用Api用户的密码，因此可以在刷新令牌时更改密码，但是我无法弄清楚如何以管理员身份登录时如何为Api用户生成令牌。用户（下面的代码不起作用，但我想为澄清起见将其添加）：

[HttpPost]
public async Task<JsonResult> getApiUserToken()
{
    var userName = "ApiUser";
    var password = Guid.NewGuid().ToString() + "A";
    var apiUser = await _context.AspNetUsers.FirstOrDefaultAsync(u => u.UserName == userName);
    var userManager = HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
    var code = await userManager.GeneratePasswordResetTokenAsync(apiUser.Id);
    var result = await UserManager.ResetPasswordAsync(apiUser.Id, code, password);

    var uri = $"{this.HttpContext.Request.Url.Scheme}://{this.HttpContext.Request.Url.Authority}/Token";
    var httpClient = new HttpClient();
    var loginData = new
    {
        grant_type = "password",
        username = apiUser.Email,
        password = password,
        ttl = "MAX",
    };

    var response = await httpClient.PostAsync(uri, new StringContent(JsonConvert.SerializeObject(loginData), Encoding.UTF8, "application/json"));
    if (!response.IsSuccessStatusCode)
    {
        throw new ApplicationException(response.ReasonPhrase);
    }
    var responJsonText = await response.Content.ReadAsStringAsync();
    return Json(JsonConvert.DeserializeObject(responJsonText), JsonRequestBehavior.AllowGet);
}