Add Proxy Example

_example/proxy/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"crypto/tls"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"time"
+
+	"github.com/sideshow/apns2"
+	"github.com/sideshow/apns2/certificate"
+	"golang.org/x/net/http2"
+)
+
+func main() {
+	certPath := flag.String("cert", "", "Path to .p12 certificate file (Required)")
+	token := flag.String("token", "", "Push token (Required)")
+	topic := flag.String("topic", "", "Topic (Required)")
+	proxy := flag.String("proxy", "", "Proxy URL (Required)")
+	flag.Parse()
+
+	if *certPath == "" || *token == "" || *topic == "" {
+		flag.PrintDefaults()
+		os.Exit(1)
+	}
+
+	certificate, certErr := certificate.FromP12File(*certPath, "")
+	if certErr != nil {
+		log.Fatal("Cert Error:", certErr)
+	}
+
+	tlsConfig := &tls.Config{
+		Certificates: []tls.Certificate{certificate},
+	}
+
+	if len(certificate.Certificate) > 0 {
+		tlsConfig.BuildNameToCertificate()
+	}
+
+	transport := &http.Transport{
+		TLSClientConfig: tlsConfig,
+		Proxy: func(request *http.Request) (*url.URL, error) {
+			return url.Parse(*proxy)
+		},
+		IdleConnTimeout: 60 * time.Second,
+	}
+
+	transportErr := http2.ConfigureTransport(transport)
+	if transportErr != nil {
+		log.Fatal("Transport Error:", transportErr)
+	}
+
+	client := &apns2.Client{
+		HTTPClient: &http.Client{
+			Transport: transport,
+			Timeout:   apns2.HTTPClientTimeout,
+		},
+		Certificate: certificate,
+		Host:        apns2.DefaultHost,
+	}
+
+	notification := &apns2.Notification{}
+	notification.DeviceToken = *token
+	notification.Topic = *topic
+	notification.Payload = []byte(`{
+			"aps" : {
+				"alert" : "Hello!"
+			}
+		}
+	`)
+
+	res, err := client.Push(notification)
+
+	if err != nil {
+		log.Fatal("Error:", err)
+	}
+
+	fmt.Printf("%v %v %v\n", res.StatusCode, res.ApnsID, res.Reason)
+}