APNS/2 is a go package designed for simple, flexible and fast Apple Push Notifications on iOS, OSX and Safari using the new HTTP/2 Push provider API.
This is a fork of the original https://github.com/sideshow/apns2 as it seems to be abandoned. Some enhancements:
- Reduced set of dependencies (just three at the time of writing, with no indirect)
- Switch to github.com/golang-jwt/jwt to fix bugs and CVEs
- Raised minimum TLS version to 1.2 for APNS connections
Additionally, the apns2
binary was removed to focus on the library part.
- Uses new Apple APNs HTTP/2 connection
- Fast - See notes on speed
- Works with go 1.7 and later
- Supports new Apple Token Based Authentication (JWT)
- Supports new iOS 10 features such as Collapse IDs, Subtitles and Mutable Notifications
- Supports new iOS 15 features interruptionLevel and relevanceScore
- Supports persistent connections to APNs
- Supports VoIP/PushKit notifications (iOS 8 and later)
- Modular & easy to use
- Tested and working in APNs production environment
go get -u github.com/sapienzaapps/apns2
package main
import (
"log"
"fmt"
"github.com/sapienzaapps/apns2"
"github.com/sapienzaapps/apns2/certificate"
)
func main() {
cert, err := certificate.FromP12File("../cert.p12", "")
if err != nil {
log.Fatal("Cert Error:", err)
}
notification := &apns2.Notification{}
notification.DeviceToken = "11aa01229f15f0f0c52029d8cf8cd0aeaf2365fe4cebc4af26cd6d76b7919ef7"
notification.Topic = "com.sideshow.Apns2"
notification.Payload = []byte(`{"aps":{"alert":"Hello!"}}`) // See Payload section below
// If you want to test push notifications for builds running directly from XCode (Development), use
// client := apns2.NewClient(cert).Development()
// For apps published to the app store or installed as an ad-hoc distribution use Production()
client := apns2.NewClient(cert).Production()
res, err := client.Push(notification)
if err != nil {
log.Fatal("Error:", err)
}
fmt.Printf("%v %v %v\n", res.StatusCode, res.ApnsID, res.Reason)
}
Instead of using a .p12
or .pem
certificate as above, you can optionally use
APNs JWT Provider Authentication Tokens. First you will need a signing key (.p8
file), Key ID and Team ID from Apple. Once you have these details, you can create a new client:
authKey, err := token.AuthKeyFromFile("../AuthKey_XXX.p8")
if err != nil {
log.Fatal("token error:", err)
}
token := &token.Token{
AuthKey: authKey,
// KeyID from developer account (Certificates, Identifiers & Profiles -> Keys)
KeyID: "ABC123DEFG",
// TeamID from developer account (View Account -> Membership)
TeamID: "DEF123GHIJ",
}
...
client := apns2.NewTokenClient(token)
res, err := client.Push(notification)
- You can use one APNs signing key to authenticate tokens for multiple apps.
- A signing key works for both the development and production environments.
- A signing key doesn’t expire but can be revoked.
At a minimum, a Notification needs a DeviceToken, a Topic and a Payload.
notification := &apns2.Notification{
DeviceToken: "11aa01229f15f0f0c52029d8cf8cd0aeaf2365fe4cebc4af26cd6d76b7919ef7",
Topic: "com.sideshow.Apns2",
Payload: []byte(`{"aps":{"alert":"Hello!"}}`),
}
You can also set an optional ApnsID, Expiration or Priority.
notification.ApnsID = "40636A2C-C093-493E-936A-2A4333C06DEA"
notification.Expiration = time.Now()
notification.Priority = apns2.PriorityLow
You can use raw bytes for the notification.Payload
as above, or you can use the payload builder package which makes it easy to construct APNs payloads.
// {"aps":{"alert":"hello","badge":1},"key":"val"}
payload := payload.NewPayload().Alert("hello").Badge(1).Custom("key", "val")
notification.Payload = payload
client.Push(notification)
Refer to the payload docs for more info.
APNS/2 draws the distinction between a valid response from Apple indicating whether or not the Notification was sent or not, and an unrecoverable or unexpected Error;
- An
Error
is returned if a non-recoverable error occurs, i.e. if there is a problem with the underlying http.Client connection or Certificate, the payload was not sent, or a valid Response was not received. - A
Response
is returned if the payload was successfully sent to Apple and a documented response was received. This struct will contain more information about whether or not the push notification succeeded, its apns-id and if applicable, more information around why it did not succeed.
To check if a Notification
was successfully sent;
res, err := client.Push(notification)
if err != nil {
log.Println("There was an error", err)
return
}
if res.Sent() {
log.Println("Sent:", res.ApnsID)
} else {
fmt.Printf("Not Sent: %v %v %v\n", res.StatusCode, res.ApnsID, res.Reason)
}
For better control over request cancellations and timeouts APNS/2 supports contexts. Using a context can be helpful if you want to cancel all pushes when the parent process is cancelled, or need finer grained control over individual push timeouts. See the Google post for more information on contexts.
ctx, cancel = context.WithTimeout(context.Background(), 10 * time.Second)
res, err := client.PushWithContext(ctx, notification)
defer cancel()
Also see the wiki page on APNS HTTP 2 Push Speed.
For best performance, you should hold on to an apns2.Client
instance and not re-create it every push. The underlying TLS connection itself can take a few seconds to connect and negotiate, so if you are setting up an apns2.Client
and tearing it down every push, then this will greatly affect performance. (Apple suggest keeping the connection open all the time).
You should also limit the amount of apns2.Client
instances. The underlying transport has a http connection pool itself, so a single client instance will be enough for most users (One instance can potentially do 4,000+ pushes per second). If you need more than this then one instance per CPU core is a good starting point.
Speed is greatly affected by the location of your server and the quality of your network connection. If you're just testing locally, behind a proxy or if your server is outside USA then you're not going to get great performance. With a good server located in AWS, you should be able to get decent throughput.
The MIT License (MIT)
Copyright (c) 2016 Adam Jones Copyright (c) 2022 Enrico Bassetti
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.