Add extension example

examples/extension/main.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/paked/messenger"
+)
+
+var (
+	serverURL   = flag.String("serverURL", "", "The server (webview) URL, must be https (required)")
+	verifyToken = flag.String("verify-token", "mad-skrilla", "The token used to verify facebook (required)")
+	verify      = flag.Bool("should-verify", false, "Whether or not the app should verify itself")
+	pageToken   = flag.String("page-token", "not skrilla", "The token that is used to verify the page on facebook")
+	appSecret   = flag.String("app-secret", "", "The app secret from the facebook developer portal (required)")
+	host        = flag.String("host", "localhost", "The host used to serve the messenger bot")
+	port        = flag.Int("port", 8080, "The port used to serve the messenger bot")
+)
+
+func main() {
+	flag.Parse()
+
+	if *verifyToken == "" || *appSecret == "" || *pageToken == "" {
+		fmt.Printf("missing arguments\n\n")
+		flag.Usage()
+
+		os.Exit(-1)
+	}
+
+	client := messenger.New(messenger.Options{
+		Verify:      *verify,
+		AppSecret:   *appSecret,
+		VerifyToken: *verifyToken,
+		Token:       *pageToken,
+	})
+
+	err := client.EnableChatExtension(messenger.HomeURL{
+		URL:                *serverURL,
+		WebviewHeightRatio: "tall",
+		WebviewShareButton: "show",
+		InTest:             true,
+	})
+	if err != nil {
+		fmt.Println("Failed to EnableChatExtension, err=", err)
+	}
+
+	// Setup a handler to be triggered when a message is received
+	client.HandleMessage(func(m messenger.Message, r *messenger.Response) {
+		fmt.Printf("%v (Sent, %v)\n", m.Text, m.Time.Format(time.UnixDate))
+
+		p, err := client.ProfileByID(m.Sender.ID)
+		if err != nil {
+			fmt.Println("Something went wrong!", err)
+		}
+
+		r.Text(fmt.Sprintf("Hello, %v!", p.FirstName), messenger.ResponseType)
+	})
+
+	addr := fmt.Sprintf("%s:%d", *host, *port)
+	log.Println("Serving messenger bot on", addr)
+	log.Fatal(http.ListenAndServe(addr, client.Handler()))
+}