ApnsServerNotification Parse(List <byte> data)
{
// COMMAND FRAME LENGTH FRAME
// 1 byte (0x02) 4 bytes ITEM ... ITEM ... ITEM ...
// ITEM ID ITEM LENGTH ITEM DATA
// 1 byte 2 bytes variable length
// ITEMS:
// 1: 32 bytes Device Token
// 2: 2048 bytes (up to) Payload
// 3: 4 bytes Notification identifier
// 4: 4 bytes Expiration
// 5: 1 byte Priority (10 - immediate, or 5 - normal)
var notification = new ApnsServerNotification();
ApnsNotificationException exception = null;
// If there aren't even 5 bytes, we can't even check if the length of notification is correct
if (data.Count < 5)
{
return(null);
}
// Let's check to see if the notification is all here in the buffer
var apnsCmd = data [0];
var apnsFrameLength = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(data.GetRange(1, 4).ToArray(), 0));
// If we don't have all of the notification's frame data that we should have, we need to keep waiting
if (data.Count - 5 < apnsFrameLength)
{
return(null);
}
var frameData = data.GetRange(5, apnsFrameLength);
// Remove the data we are processing
data.RemoveRange(0, apnsFrameLength + 5);
// Now process each item from the frame
while (frameData.Count > 0)
{
// We need at least 4 bytes to count as a full item (1 byte id + 2 bytes length + at least 1 byte data)
if (frameData.Count < 4)
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.ProcessingError, "Invalid Frame Data");
break;
}
var itemId = frameData [0];
var itemLength = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(frameData.GetRange(1, 2).ToArray(), 0));
// Make sure the item data is all there
if (frameData.Count - 3 < itemLength)
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.ProcessingError, "Invalid Item Data");
break;
}
var itemData = frameData.GetRange(3, itemLength);
frameData.RemoveRange(0, itemLength + 3);
if (itemId == 1) // Device Token
{
notification.DeviceToken = BitConverter.ToString(itemData.ToArray()).Replace("-", "");
if (notification.DeviceToken.Length != 64)
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.InvalidTokenSize, "Invalid Token Size");
}
}
else if (itemId == 2) // Payload
{
notification.Payload = BitConverter.ToString(itemData.ToArray());
if (notification.Payload.Length > 2048)
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.InvalidPayloadSize, "Invalid Payload Size");
}
}
else if (itemId == 3) // Identifier
{
if (itemData.Count > 4)
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.ProcessingError, "Identifier too long");
}
else
{
notification.Identifier = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(itemData.ToArray(), 0));
}
}
else if (itemId == 4) // Expiration
{
int secondsSinceEpoch = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(itemData.ToArray(), 0));
var expire = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds(secondsSinceEpoch);
notification.Expiration = expire;
}
else if (itemId == 5) // Priority
{
notification.Priority = itemData [0];
}
}
if (exception == null && string.IsNullOrEmpty(notification.DeviceToken))
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.MissingDeviceToken, "Missing Device Token");
}
if (exception == null && string.IsNullOrEmpty(notification.Payload))
{
exception = new ApnsNotificationException(ApnsNotificationErrorStatusCode.MissingPayload, "Missing Payload");
}
// See if there was an error and we can assign an ID to it
if (exception != null)
{
exception.NotificationId = notification.Identifier;
throw exception;
}
return(notification);
}
ApnsServerNotification Parse (List<byte> data)
{
// COMMAND FRAME LENGTH FRAME
// 1 byte (0x02) 4 bytes ITEM ... ITEM ... ITEM ...
// ITEM ID ITEM LENGTH ITEM DATA
// 1 byte 2 bytes variable length
// ITEMS:
// 1: 32 bytes Device Token
// 2: 2048 bytes (up to) Payload
// 3: 4 bytes Notification identifier
// 4: 4 bytes Expiration
// 5: 1 byte Priority (10 - immediate, or 5 - normal)
var notification = new ApnsServerNotification ();
ApnsNotificationException exception = null;
// If there aren't even 5 bytes, we can't even check if the length of notification is correct
if (data.Count < 5)
return null;
// Let's check to see if the notification is all here in the buffer
var apnsCmd = data [0];
var apnsFrameLength = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(data.GetRange (1, 4).ToArray (), 0));
// If we don't have all of the notification's frame data that we should have, we need to keep waiting
if (data.Count - 5 < apnsFrameLength)
return null;
var frameData = data.GetRange (5, apnsFrameLength);
// Remove the data we are processing
data.RemoveRange (0, apnsFrameLength + 5);
// Now process each item from the frame
while (frameData.Count > 0) {
// We need at least 4 bytes to count as a full item (1 byte id + 2 bytes length + at least 1 byte data)
if (frameData.Count < 4) {
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.ProcessingError, "Invalid Frame Data");
break;
}
var itemId = frameData [0];
var itemLength = IPAddress.NetworkToHostOrder (BitConverter.ToInt16 (frameData.GetRange (1, 2).ToArray (), 0));
// Make sure the item data is all there
if (frameData.Count - 3 < itemLength) {
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.ProcessingError, "Invalid Item Data");
break;
}
var itemData = frameData.GetRange (3, itemLength);
frameData.RemoveRange (0, itemLength + 3);
if (itemId == 1) { // Device Token
notification.DeviceToken = BitConverter.ToString(itemData.ToArray()).Replace("-", "");
if (notification.DeviceToken.Length != 64)
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.InvalidTokenSize, "Invalid Token Size");
} else if (itemId == 2) { // Payload
notification.Payload = BitConverter.ToString(itemData.ToArray());
if (notification.Payload.Length > 2048)
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.InvalidPayloadSize, "Invalid Payload Size");
} else if (itemId == 3) { // Identifier
if (itemData.Count > 4)
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.ProcessingError, "Identifier too long");
else
notification.Identifier = IPAddress.NetworkToHostOrder (BitConverter.ToInt32 (itemData.ToArray (), 0));
} else if (itemId == 4) { // Expiration
int secondsSinceEpoch = IPAddress.NetworkToHostOrder(BitConverter.ToInt32(itemData.ToArray (), 0));
var expire = new DateTime (1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddSeconds (secondsSinceEpoch);
notification.Expiration = expire;
} else if (itemId == 5) { // Priority
notification.Priority = itemData [0];
}
}
if (exception == null && string.IsNullOrEmpty (notification.DeviceToken))
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.MissingDeviceToken, "Missing Device Token");
if (exception == null && string.IsNullOrEmpty (notification.Payload))
exception = new ApnsNotificationException (ApnsNotificationErrorStatusCode.MissingPayload, "Missing Payload");
// See if there was an error and we can assign an ID to it
if (exception != null) {
exception.NotificationId = notification.Identifier;
throw exception;
}
return notification;
}
