Send msg to Azure service bus que via REST

https://stackoverflow.com/questions/50914924/send-msg-to-azure-service-bus-que-via-rest

https://docs.microsoft.com/en-us/rest/api/servicebus/send-message-to-queue

public static string GetSasToken(string resourceUri, string keyName, string key, TimeSpan ttl)
{
      var expiry = GetExpiry(ttl);
      string stringToSign = HttpUtility.UrlEncode(resourceUri) + "\n" + expiry;
      HMACSHA256 hmac = new HMACSHA256(Encoding.UTF8.GetBytes(key));
      var signature = Convert.ToBase64String(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign)));
      var sasToken = String.Format(CultureInfo.InvariantCulture, "SharedAccessSignature sr={0}&sig={1}&se={2}&skn={3}",
      HttpUtility.UrlEncode(resourceUri), HttpUtility.UrlEncode(signature), expiry, keyName);
      return sasToken;
}

private static string GetExpiry(TimeSpan ttl)
{
    TimeSpan expirySinceEpoch = DateTime.UtcNow - new DateTime(1970, 1, 1) + ttl;
    return Convert.ToString((int)expirySinceEpoch.TotalSeconds);
}
string queueUrl = "https://tomtestsb.servicebus.windows.net/" + "queue" + "/messages";
string token = GetSasToken(queueUrl,"Key", "value", TimeSpan.FromDays(1));