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client.go
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client.go
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// Package apns2 is a go Apple Push Notification Service (APNs) provider that
// allows you to send remote notifications to your iOS, tvOS, and OS X
// apps, using the new APNs HTTP/2 network protocol.
package apns2
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"net/http"
"golang.org/x/net/http2"
)
// Apple HTTP/2 Development & Production urls
const (
HostDevelopment = "https://api.development.push.apple.com"
HostProduction = "https://api.push.apple.com"
)
// DefaultHost is a mutable var for testing purposes
var DefaultHost = HostDevelopment
// Client represents a connection with the APNs
type Client struct {
HTTPClient *http.Client
Certificate tls.Certificate
Host string
}
// NewClient returns a new Client with an underlying http.Client configured with
// the correct APNs HTTP/2 transport settings. It does not connect to the APNs
// until the first Notification is sent via the Push method.
//
// As per the Apple APNs Provider API, you should keep a handle on this client
// so that you can keep your connections with APNs open across multiple
// notifications; don’t repeatedly open and close connections. APNs treats rapid
// connection and disconnection as a denial-of-service attack.
func NewClient(certificate tls.Certificate) *Client {
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{certificate},
}
if len(certificate.Certificate) > 0 {
tlsConfig.BuildNameToCertificate()
}
transport := &http2.Transport{
TLSClientConfig: tlsConfig,
}
return &Client{
HTTPClient: &http.Client{Transport: transport},
Certificate: certificate,
Host: DefaultHost,
}
}
// Development sets the Client to use the APNs development push endpoint.
func (c *Client) Development() *Client {
c.Host = HostDevelopment
return c
}
// Production sets the Client to use the APNs production push endpoint.
func (c *Client) Production() *Client {
c.Host = HostProduction
return c
}
// Push sends a Notification to the APNs gateway. If the underlying http.Client
// is not currently connected, this method will attempt to reconnect
// transparently before sending the notification. It will return a Response
// indicating whether the notification was accepted or rejected by the APNs
// gateway, or an error if something goes wrong.
func (c *Client) Push(n *Notification) (*Response, error) {
payload, err := json.Marshal(n)
if err != nil {
return nil, err
}
url := fmt.Sprintf("%v/3/device/%v", c.Host, n.DeviceToken)
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(payload))
setHeaders(req, n)
httpRes, err := c.HTTPClient.Do(req)
if err != nil {
return nil, err
}
defer httpRes.Body.Close()
response := &Response{}
response.StatusCode = httpRes.StatusCode
response.ApnsID = httpRes.Header.Get("apns-id")
decoder := json.NewDecoder(httpRes.Body)
if err := decoder.Decode(&response); err != nil && err != io.EOF {
return &Response{}, err
}
return response, nil
}
func setHeaders(r *http.Request, n *Notification) {
r.Header.Set("Content-Type", "application/json; charset=utf-8")
if n.Topic != "" {
r.Header.Set("apns-topic", n.Topic)
}
if n.ApnsID != "" {
r.Header.Set("apns-id", n.ApnsID)
}
if n.Priority > 0 {
r.Header.Set("apns-priority", fmt.Sprintf("%v", n.Priority))
}
if !n.Expiration.IsZero() {
r.Header.Set("apns-expiration", fmt.Sprintf("%v", n.Expiration.Unix()))
}
}