Swift iOS 13 push notifications device token convert in javascript/php/typescript

Question

I have a Swift application with push notifications. Whenever the device registered a device token to receive push notifications I got a normal string like: QY1WcHzcxSbAYPJa0OrTQwFhYZ3ilRUQ0HmKgUlP4IBsLQAJazZnZ4XuGrNO2l4S . However, with iOS 13 a new device token is received in the format: { length = 32, bytes = 0xd3d997af 967d1f43 b405374a 13394d2f ... 28f10282 14af515f } .

I use the following code to convert the new device token:

let deviceTokenString = deviceToken.map { String(format: "%02x", $0) }.joined()

This gives me back a string with 64 characters.

The original application is not build in swift. How can I make an implementation in javascript/php/typescript where I receive a string like: { length = 32, bytes = 0xd3d997af 967d1f43 b405374a 13394d2f ... 28f10282 14af515f } and convert it to: QY1WcHzcxSbAYPJa0OrTQwFhYZ3ilRUQ0HmKgUlP4IBsLQAJazZnZ4XuGrNO2l4S

Answer 1

For Swift 5.0 you need to use below code.

    class func string(fromDeviceToken deviceToken: Data?) -> String? {
    let length = deviceToken?.count ?? 0
    if length == 0 {
        return nil
    }
    let buffer = UInt8(deviceToken?.bytes ?? 0)
    var hexString = String(repeating: "\0", count: length * 2)
    for i in 0..<length {
        hexString += String(format: "%02x", buffer[i])
    }
    return hexString
}  

And if you are using Objective-C then You need to use below code:

    + (NSString *)stringFromDeviceToken:(NSData *)deviceToken {
    NSUInteger length = deviceToken.length;
    if (length == 0) {
        return nil;
    }
    const unsigned char *buffer = deviceToken.bytes;
    NSMutableString *hexString  = [NSMutableString stringWithCapacity:(length * 2)];
    for (int i = 0; i < length; ++i) {
        [hexString appendFormat:@"%02x", buffer[i]];
    }
    return [hexString copy];
}  

You can check this out Apple Push Notification Forums