Push Notifications With Go

I had never sent a push notification in my life. I wanted to try it out. Writing my server in Go, I used the sideshow/apns2 library.

Being a Go newb, I struggled with a couple things. I was unsure which things needed to be imported. Turns out to use the token method, and the payload builder, three imports are needed:

import (
    "github.com/sideshow/apns2"
    "github.com/sideshow/apns2/payload"
    "github.com/sideshow/apns2/token"
)

Then you create a token and client:

authKey, err := token.AuthKeyFromFile("AuthKey_KEYID.p8")
    if err != nil {
        log.Fatal("token error:", err)
    }

    token := &token.Token{
        AuthKey: authKey,
        KeyID:   "KEYID",
        TeamID:  "TEAMID",
    }

    client := apns2.NewTokenClient(token).Production() // or .Development()

I used the same key file that I use for WeatherKit. After getting the device tokens to send to, you can create a notification and send it:

...
notification := &apns2.Notification{}
notification.DeviceToken = deviceToken
notification.Topic = "com.your.bundle.id"
notification.Priority = apns2.PriorityHigh
notification.Payload = payload.NewPayload().Alert("I'm a friendly push notification!")
res, err := client.Push(notification)
...

You can check the result to make sure it was successful or not. I haven’t implemented that because I’m lazy and want to punish myself in the future for it.

With that, I was able to send some push notifications to my iOS app running the the simulator!

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