c# – Microsoft Graph – 无法以静默方式获取令牌

当我调用AcquireTokenSilentAsync()时,我收到错误“无法以静默方式获取令牌.调用方法AcquireToken”.

因此,我尝试使用AcquireTokenAsync()方法.这会获得一个令牌,但是当我尝试访问该资源时,我得到403 – 禁止.

我在Fiddler测试了它,它的工作原理.

当我从AcquireTokenAsync()检查令牌并将其与从fiddler获得的令牌进行比较时,它大约是长度的1/3.我不知道这是否是一个问题,是否有修复？

有人知道这个问题的解决方案吗？

我的代码如下：

为gettoken()：

public async static Task<AuthenticationResult> GetTokenAsync(AuthenticationContext ctx,string resourceId)
{
    ClientCredential credential = new ClientCredential(OfficeSettings.ClientId,OfficeSettings.ClientSecret);
    var userObjectId = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;
    UserIdentifier ident = new UserIdentifier(userObjectId,UserIdentifierType.UniqueId);

    var redirectUrl = new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path));

    try
    {
        var result = await ctx.AcquireTokenSilentAsync(resourceId,credential,ident);
        //var result = await ctx.AcquireTokenAsync(resourceId,credential);
        LastAuthority = ctx.Authority;
        return result;
    }
    catch (AdalException e)
    {
        ctx.TokenCache.Clear();
        return null;
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

GetUserEmail()(访问资源)：

private const string _allUsersUrl = "https://graph.microsoft.com/beta/users?$filter=displayName%20eq%20'{0}'";

public static async Task<List<string>> GetUserEmails(List<string> displayNames)
{
    var emails = new List<string>();
    using (var client = new HttpClient())
    {
        foreach (var name in displayNames)
        {
            var url = string.Format(_allUsersUrl,name.Replace(" ","+")).Replace(" ","%20");
            using (var req = new HttpRequestMessage(HttpMethod.Get,url))
            {
                var token = await GetToken();
                req.Headers.Add("Authorization",string.Format("Bearer {0}",token));
                req.Headers.TryAddWithoutValidation("Content-Type","application/json");
                using (var response = await client.SendAsync(req))
                {
                    //TODO: Forbidden error message. However,token seems to be retrieved correctly
                    var content = await response.Content.ReadAsStringAsync();
                    foreach (var item in JObject.Parse(content)["value"])
                    {
                        emails.Add(item["userPrincipalName"].ToString());
                    }
                }
            }
        }
    }
    return emails;
}

编辑：

我还检查了缓存的内容,并将其与传递给AcquireTokenSilentAsync()的参数进行了比较,一切似乎都匹配.