403試圖使用Azure的通知中心批量發送

Question

我嘗試使用批處理時禁止發送API端點一些推送通知發送到基於自身利益的特定用戶。我們得出的結論是，通知中心的標籤系統不能提供我們所需的靈活性。

我有一個存儲可以通過直接發送端點可以使用，但即使使用微軟提供的提供了一個403錯誤與上出了什麼問題沒有信息的標準信息的設備令牌的數據庫。

public class WnsNotificationService : BaseNotificationService 
{ 
    private ISubscriptionProvider subscriptionProvider; 

    /// <summary> 
    /// Initializes a new instance of the <see cref="WnsNotificationService" /> class. 
    /// </summary> 
    /// <param name="telemetryService">The telemetry service.</param> 
    /// <param name="subscriptionProvider">The subscription provider.</param> 
    public WnsNotificationService(ITelemetryService telemetryService, ISubscriptionProvider subscriptionProvider) : base(telemetryService) 
    { 
     this.subscriptionProvider = subscriptionProvider; 
    } 

    /// <summary> 
    /// Sends the new Airport Event notification to windows devices via WNS. 
    /// </summary> 
    /// <param name="airportEvent">The Airport Event.</param> 
    /// <returns> 
    /// Notification Result 
    /// </returns> 
    public override async Task<NotificationResult> SendNotification(AirportEvent airportEvent) 
    { 
     try 
     { 
      IEnumerable<IEnumerable<string>> deviceCollection = 
       this.subscriptionProvider.GetSubscribedUserPNSHandles(airportEvent, PushNotificationPlatform.wns).Batch(1000); 

      foreach (var devices in deviceCollection) 
      { 
       ServiceBusConnectionStringBuilder connectionString = new ServiceBusConnectionStringBuilder(ConfigurationManager.AppSettings["Microsoft.Azure.NotificationHubs.ConnectionString"]); 
       string serviceBusNamespace = connectionString.Endpoints.First().Host; 
       string namespaceKeyName = connectionString.SharedAccessKeyName; 
       string namespaceKey = connectionString.SharedAccessKey; 

       var uri = new Uri($"{ ConfigurationManager.AppSettings["Microsoft.Azure.NotificationHubs.Url"] }/{ ConfigurationManager.AppSettings["Microsoft.Azure.NotificationHubs.HubName"] }/messages/$batch?direct&api-version=2015-08"); 
       var request = WebRequest.CreateHttp(uri); 
       request.Method = "POST"; 
       request.ContentType = @"multipart/mixed; boundary = ""simple-boundary"""; 
       request.Headers["Authorization"] = SharedAccessSignatureTokenProvider.GetSharedAccessSignature(namespaceKeyName, namespaceKey, serviceBusNamespace, TimeSpan.FromMinutes(45)); 
       request.Headers["ServiceBusNotification-Format"] = "windows"; 
       request.Headers["X-WNS-Type"] = "wns/raw"; 

       string body = this.GenerateBatchRequestBody(airportEvent.AirportEventId, devices); 

       byte[] requestBytes = new ASCIIEncoding().GetBytes(body); 
       Stream requestStream = request.GetRequestStream(); 
       requestStream.Write(requestBytes, 0, requestBytes.Length); 

       request.GetResponse(); 
      } 

      return new NotificationResult(true); 
     } 
     catch (Exception) 
     { 
      return new NotificationResult(false); 
     } 
    } 

    /// <summary> 
    /// Sends the new Airport Event notification to a specific windows device via WNS. 
    /// </summary> 
    /// <param name="deviceId">The device identifier.</param> 
    /// <param name="airportEvent">The Airport Event.</param> 
    /// <returns> 
    /// Notification Result 
    /// </returns> 
    /// <exception cref="System.NotImplementedException">Not Implemented Exception</exception> 
    public override Task<NotificationResult> SendNotificationToDevice(string deviceId, AirportEvent airportEvent) 
    { 
     throw new NotImplementedException(); 
    } 

    /// <summary> 
    /// Generates the batch request body. 
    /// </summary> 
    /// <param name="airportEventGuid">The airport event unique identifier.</param> 
    /// <param name="devices">The devices.</param> 
    /// <returns>Request Body</returns> 
    private string GenerateBatchRequestBody(Guid airportEventGuid, IEnumerable<string> devices) 
    { 
     return @" 
--simple-boundary 
Content-type: text/xml 
Content-Disposition: inline; name=notification 

<toast><visual><binding template=""ToastText01""><text id=""1"">Hello from 
Batch Direct Send!</text></binding></visual></toast> 
--simple-boundary 
Content-type: application/json 
Content-Disposition: inline; name=devices 

['https://{foo}.notify.windows.com/?token={bar}'] 
--simple-boundary--"; 
    } 
} 

這是用在https://azure.microsoft.com/en-us/blog/push-notification-hubs-batch-direct-send/

Answer 1

提供根據你的描述信息，我檢查Direct Batch Send，並遵循了這一樣本azure-notificationhubs-samples，以測試在我身邊這個問題。一些試驗後，我可以使它在我身邊的工作方式如下：

基於您的代碼，我認爲你需要改變request.Headers["X-WNS-Type"] = "wns/raw";到request.Headers["X-WNS-Type"] = "wns/toast";，和你的授權令牌可能是無效的。這裏是我的生成授權令牌的方法，你可以參考一下吧：

/// <summary> 
/// GetSharedAccessSignature 
/// </summary> 
/// <param name="SasKeyName">SharedAccessKeyName</param> 
/// <param name="SasKeyValue">SharedAccessKey</param> 
/// <param name="uri">resourceURI (e.g. https://{namespace}.servicebus.windows.net/{NotificationHub}/messages/$batch?direct&api-version=2015-08)</param> 
/// <param name="minUntilExpire">minUntilExpire</param> 
/// <returns></returns> 
private static string GetSharedAccessSignature(string SasKeyName, string SasKeyValue, string uri, TimeSpan minUntilExpire) 
{ 
    string targetUri = Uri.EscapeDataString(uri.ToLower()).ToLower(); 

    // Add an expiration in seconds to it. 
    long expiresOnDate = DateTime.Now.Ticks/TimeSpan.TicksPerMillisecond; 
    expiresOnDate += (long)minUntilExpire.TotalMilliseconds; 
    long expires_seconds = expiresOnDate/1000; 
    String toSign = targetUri + "\n" + expires_seconds; 

    // Generate a HMAC-SHA256 hash or the uri and expiration using your secret key. 
    byte[] keyBytes = System.Text.Encoding.UTF8.GetBytes(SasKeyValue); 
    HMACSHA256 hmacsha256 = new HMACSHA256(keyBytes); 
    byte[] hash = hmacsha256.ComputeHash(System.Text.Encoding.UTF8.GetBytes(toSign)); 

    // Create the token string using the base64 
    string signature = Uri.EscapeDataString(Convert.ToBase64String(hash)); 

    return "SharedAccessSignature sr=" + targetUri + "&sig=" + signature + "&se=" + expires_seconds + "&skn=" + SasKeyName; 
} 

注：下面是官方的代碼示例，您可以參考it。

另外，隨着Direct Batch Send狀態如下：

發送一個批通知的直接向設備句柄（如由通知類型表達的有效令牌）的集合。該API可用於Basic and Standard tier Notification Hub namespaces。

您需要將定價等級改變爲基本或標準，否則，你將通過Fiddler得到如下回應：