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Update README.md
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‎PushToSLPhoneApp/README.md

+137-137
Original file line numberDiff line numberDiff line change
@@ -39,146 +39,146 @@ Here are couple of links to provide guidance (from Windows Dev Center) -
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9. Make sure you are calling the following method at the app startup. Configure your *Notification Hub name* and the *DefaultListenSharedAccessSignature*.
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public async void RegisterToReceiveNotifications()
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{
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string notificationHubName = "[hubName]";
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string connectionString = "[ConnectionString-DefaultListenSharedAccessSignature]";
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// Register with WNS
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var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
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// Register with Azure Notification Hubs
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NotificationHub hub = new NotificationHub(notificationHubName, connectionString);
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hub.Register(channel.Uri);
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Debug.WriteLine("ChannelURI : {0}", channel.Uri);
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}
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public async void RegisterToReceiveNotifications()
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{
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string notificationHubName = "[hubName]";
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string connectionString = "[ConnectionString-DefaultListenSharedAccessSignature]";
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// Register with WNS
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var channel = await PushNotificationChannelManager.CreatePushNotificationChannelForApplicationAsync();
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// Register with Azure Notification Hubs
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NotificationHub hub = new NotificationHub(notificationHubName, connectionString);
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hub.Register(channel.Uri);
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Debug.WriteLine("ChannelURI : {0}", channel.Uri);
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}
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10. Add a Notification Hub class which abstracts the functionality of registering with the Azure Notification Hubs. This is based on [Notification Hubs REST APIs]. See explanation in the following steps:
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class NotificationHub
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{
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private const string ApiVersion = "?api-version=2014-09";
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private const string AuthHeader = "Authorization";
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private const string ContentType = "application/atom+xml;type=entry;charset=utf-8";
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static string HubName { get; set; }
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static string ConnectionString { get; set; }
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static string Endpoint { get; set; }
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static string SasKeyName { get; set; }
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static string SasKeyValue { get; set; }
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static string Payload { get; set; }
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public NotificationHub(string hubName, string connectionString)
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{
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HubName = hubName;
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ConnectionString = connectionString;
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}
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public void Register(string pushChannel)
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{
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ParseConnectionInfo();
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SendNHRegistrationRequest(pushChannel);
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}
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// From http://msdn.microsoft.com/en-us/library/dn495627.aspx
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private static void ParseConnectionInfo()
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{
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if (string.IsNullOrWhiteSpace(HubName))
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{
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throw new InvalidOperationException("Hub name is empty");
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}
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var parts = ConnectionString.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length != 3)
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{
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throw new InvalidOperationException("Error parsing connection string: " + ConnectionString);
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}
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foreach (var part in parts)
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{
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if (part.StartsWith("Endpoint"))
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{
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Endpoint = "https" + part.Substring(11);
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}
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else if (part.StartsWith("SharedAccessKeyName"))
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{
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SasKeyName = part.Substring(20);
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}
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else if (part.StartsWith("SharedAccessKey"))
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{
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SasKeyValue = part.Substring(16);
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}
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}
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}
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private static string GenerateSaSToken(Uri uri)
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{
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var targetUri = WebUtility.UrlEncode(uri.ToString().ToLower()).ToLower();
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var expiresOnDate = Convert.ToInt64(DateTime.UtcNow.Subtract
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(new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds) + 60 * 60;
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var toSign = targetUri + "\n" + expiresOnDate;
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var keyBytes = Encoding.UTF8.GetBytes(SasKeyValue);
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var mac = new HMACSHA256(keyBytes);
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mac.Initialize();
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var rawHmac = mac.ComputeHash(Encoding.UTF8.GetBytes(toSign));
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var signature = WebUtility.UrlEncode(Convert.ToBase64String(rawHmac));
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var token = "SharedAccessSignature sr=" + targetUri + "&sig="
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+ signature + "&se=" + expiresOnDate + "&skn=" + SasKeyName;
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return token;
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}
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private static void SendNHRegistrationRequest(string pushChannel)
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{
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Payload =
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@"<?xml version=""1.0"" encoding=""utf-8""?>
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<entry xmlns=""http://www.w3.org/2005/Atom"">
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<content type=""application/xml"">
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<WindowsRegistrationDescription xmlns:i=""http://www.w3.org/2001/XMLSchema-instance"" xmlns=""http://schemas.microsoft.com/netservices/2010/10/servicebus/connect"">
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<ChannelUri>{WindowsPushChannel}</ChannelUri>
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</WindowsRegistrationDescription >
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</content>
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</entry>";
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Payload = Payload.Replace("{WindowsPushChannel}", pushChannel);
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var uri = new Uri(Endpoint + HubName + "/registrations/" + ApiVersion);
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var sendRequest = WebRequest.CreateHttp(uri);
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sendRequest.Method = "POST";
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sendRequest.ContentType = ContentType;
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sendRequest.Headers[AuthHeader] = GenerateSaSToken(uri);
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sendRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), sendRequest);
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}
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static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
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{
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HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
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// End the stream request operation
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Stream postStream = request.EndGetRequestStream(asynchronousResult);
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byte[] byteArray = Encoding.UTF8.GetBytes(Payload);
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postStream.Write(byteArray, 0, byteArray.Length);
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postStream.Close();
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//Start the web request
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request.BeginGetResponse(new AsyncCallback(GetResponceStreamCallback), request);
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}
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static void GetResponceStreamCallback(IAsyncResult callbackResult)
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{
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HttpWebRequest request = (HttpWebRequest)callbackResult.AsyncState;
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HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
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using (StreamReader httpWebStreamReader = new StreamReader(response.GetResponseStream()))
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{
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string result = httpWebStreamReader.ReadToEnd();
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//For debug: show results
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Debug.WriteLine(result);
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}
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}
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}
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class NotificationHub
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{
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private const string ApiVersion = "?api-version=2014-09";
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private const string AuthHeader = "Authorization";
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private const string ContentType = "application/atom+xml;type=entry;charset=utf-8";
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static string HubName { get; set; }
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static string ConnectionString { get; set; }
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static string Endpoint { get; set; }
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static string SasKeyName { get; set; }
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static string SasKeyValue { get; set; }
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static string Payload { get; set; }
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public NotificationHub(string hubName, string connectionString)
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{
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HubName = hubName;
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ConnectionString = connectionString;
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}
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public void Register(string pushChannel)
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{
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ParseConnectionInfo();
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SendNHRegistrationRequest(pushChannel);
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}
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// From http://msdn.microsoft.com/en-us/library/dn495627.aspx
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private static void ParseConnectionInfo()
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{
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if (string.IsNullOrWhiteSpace(HubName))
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{
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throw new InvalidOperationException("Hub name is empty");
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}
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var parts = ConnectionString.Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries);
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if (parts.Length != 3)
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{
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throw new InvalidOperationException("Error parsing connection string: " + ConnectionString);
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}
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foreach (var part in parts)
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{
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if (part.StartsWith("Endpoint"))
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{
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Endpoint = "https" + part.Substring(11);
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}
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else if (part.StartsWith("SharedAccessKeyName"))
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{
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SasKeyName = part.Substring(20);
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}
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else if (part.StartsWith("SharedAccessKey"))
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{
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SasKeyValue = part.Substring(16);
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}
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}
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}
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private static string GenerateSaSToken(Uri uri)
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{
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var targetUri = WebUtility.UrlEncode(uri.ToString().ToLower()).ToLower();
117+
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var expiresOnDate = Convert.ToInt64(DateTime.UtcNow.Subtract
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(new DateTime(1970, 1, 1, 0, 0, 0)).TotalSeconds) + 60 * 60;
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var toSign = targetUri + "\n" + expiresOnDate;
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var keyBytes = Encoding.UTF8.GetBytes(SasKeyValue);
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var mac = new HMACSHA256(keyBytes);
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mac.Initialize();
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var rawHmac = mac.ComputeHash(Encoding.UTF8.GetBytes(toSign));
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var signature = WebUtility.UrlEncode(Convert.ToBase64String(rawHmac));
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var token = "SharedAccessSignature sr=" + targetUri + "&sig="
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+ signature + "&se=" + expiresOnDate + "&skn=" + SasKeyName;
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return token;
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}
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private static void SendNHRegistrationRequest(string pushChannel)
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{
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Payload =
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@"<?xml version=""1.0"" encoding=""utf-8""?>
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<entry xmlns=""http://www.w3.org/2005/Atom"">
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<content type=""application/xml"">
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<WindowsRegistrationDescription xmlns:i=""http://www.w3.org/2001/XMLSchema-instance"" xmlns=""http://schemas.microsoft.com/netservices/2010/10/servicebus/connect"">
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<ChannelUri>{WindowsPushChannel}</ChannelUri>
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</WindowsRegistrationDescription >
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</content>
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</entry>";
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Payload = Payload.Replace("{WindowsPushChannel}", pushChannel);
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var uri = new Uri(Endpoint + HubName + "/registrations/" + ApiVersion);
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var sendRequest = WebRequest.CreateHttp(uri);
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sendRequest.Method = "POST";
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sendRequest.ContentType = ContentType;
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sendRequest.Headers[AuthHeader] = GenerateSaSToken(uri);
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sendRequest.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), sendRequest);
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}
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static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
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{
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HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
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// End the stream request operation
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Stream postStream = request.EndGetRequestStream(asynchronousResult);
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byte[] byteArray = Encoding.UTF8.GetBytes(Payload);
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postStream.Write(byteArray, 0, byteArray.Length);
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postStream.Close();
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//Start the web request
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request.BeginGetResponse(new AsyncCallback(GetResponceStreamCallback), request);
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}
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static void GetResponceStreamCallback(IAsyncResult callbackResult)
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{
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HttpWebRequest request = (HttpWebRequest)callbackResult.AsyncState;
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HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
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using (StreamReader httpWebStreamReader = new StreamReader(response.GetResponseStream()))
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{
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string result = httpWebStreamReader.ReadToEnd();
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//For debug: show results
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Debug.WriteLine(result);
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}
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}
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}
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11. `ParseConnectionInfo` & `GenerateSaSToken` are used to create the standard Authorization header you need to communicate with Azure Notification Hubs.
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