How to send APNs push messages using APNs Auth Key and standard CLI tools?

Question

Apple recently added a new authentication method to APNS ( Apple Push Notification Authentication Key (Sandbox & Production)).

The downloaded key is a

Answer 1

The answer provided by Nicolas Manzini, while helpful, did not fully work for me. I also wanted to use command line curl. In particular, reading in the .p8 file was causing some problems. A modified version:

 'ES256', 'kid' => $keyid];
$header = base64_encode(json_encode($header));

$claim = ['iss' => $teamid, 'iat' => time()];
$claim = base64_encode(json_encode($claim));

$tok = $header . '.' . $claim;

// pass in empty $signature, 2nd line below fills it
$signature = '';
$result = openssl_sign($tok, $signature, $privateKey, OPENSSL_ALGO_SHA256);      //  'sha256'
if (! $result) {
    die('unable to create signature');
}

$sign = base64_encode($signature);

openssl_free_key($privateKey);

$jwt = $tok . '.' . $sign;

foreach($tokens as $token) {
    $cmd = '\
    /usr/local/bin/curl -v \
    -d \'{"aps":{"alert":{"title":"Notification Title","body":"You are being notified!"},"sound":"default"}}\' \
    -H "apns-topic: com.app.bundle.id" \
    -H "authorization: bearer ' . $jwt . '" \
    -H "content-type:application/json" \
    --http2 \
    https://api.push.apple.com/3/device/' . $token . ' 2>&1';    // ending w/ 2>&1, sends output to $output

    exec($cmd, $output, $return);

    if ($return != 0) {
        // be notified of error
    }
    else {
        foreach($output as $line) {
            if (strpos($line, 'apns-id')) {
                $apns = $line;
            }
        }
    }
}

?>