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package apns
import (
"bytes"
"crypto/tls"
"encoding/binary"
"encoding/hex"
"errors"
"net"
"strings"
"time"
)
// Wait at most this many seconds for feedback data from Apple.
const FeedbackTimeoutSeconds = 5
// FeedbackChannel will receive individual responses from Apple.
var FeedbackChannel = make(chan (*FeedbackResponse))
// If there's nothing to read, ShutdownChannel gets a true.
var ShutdownChannel = make(chan bool)
// FeedbackResponse represents a device token that Apple has
// indicated should not be sent to in the future.
type FeedbackResponse struct {
Timestamp uint32
DeviceToken string
}
// NewFeedbackResponse creates and returns a FeedbackResponse structure.
func NewFeedbackResponse() (resp *FeedbackResponse) {
resp = new(FeedbackResponse)
return
}
// ListenForFeedback connects to the Apple Feedback Service
// and checks for device tokens.
//
// Feedback consists of device tokens that should
// not be sent to in the future; Apple *does* monitor that
// you respect this so you should be checking it ;)
func (client *Client) ListenForFeedback() (err error) {
var cert tls.Certificate
if len(client.CertificateBase64) == 0 && len(client.KeyBase64) == 0 {
// The user did not specify raw block contents, so check the filesystem.
cert, err = tls.LoadX509KeyPair(client.CertificateFile, client.KeyFile)
} else {
// The user provided the raw block contents, so use that.
cert, err = tls.X509KeyPair([]byte(client.CertificateBase64), []byte(client.KeyBase64))
}
if err != nil {
return err
}
gatewayParts := strings.Split(client.Gateway, ":")
conf := &tls.Config{
Certificates: []tls.Certificate{cert},
ServerName: gatewayParts[0],
}
conn, err := net.Dial("tcp", client.Gateway)
if err != nil {
return err
}
defer conn.Close()
conn.SetReadDeadline(time.Now().Add(FeedbackTimeoutSeconds * time.Second))
tlsConn := tls.Client(conn, conf)
err = tlsConn.Handshake()
if err != nil {
return err
}
var tokenLength uint16
buffer := make([]byte, 38, 38)
deviceToken := make([]byte, 32, 32)
for {
_, err := tlsConn.Read(buffer)
if err != nil {
ShutdownChannel <- true
break
}
resp := NewFeedbackResponse()
r := bytes.NewReader(buffer)
binary.Read(r, binary.BigEndian, &resp.Timestamp)
binary.Read(r, binary.BigEndian, &tokenLength)
binary.Read(r, binary.BigEndian, &deviceToken)
if tokenLength != 32 {
return errors.New("token length should be equal to 32, but isn't")
}
resp.DeviceToken = hex.EncodeToString(deviceToken)
FeedbackChannel <- resp
}
return nil
}
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