Add basic Google Authenticator TOTP client.

totpc/totpc.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fmt"
+	"github.com/gokyle/twofactor"
+	"io/ioutil"
+	"time"
+)
+
+func main() {
+	otp := twofactor.GenerateGoogleTOTP()
+	if otp == nil {
+		fmt.Println("totpc: failed to generate token")
+		return
+	}
+
+	qr, err := otp.QR("totpc-demo")
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	err = ioutil.WriteFile("out.png", qr, 0644)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	fmt.Println(otp.OTP())
+	for {
+		for {
+			t := time.Now()
+			if t.Second() == 0 {
+				break
+			} else if t.Second() == 30 {
+				break
+			}
+			<-time.After(1 * time.Second)
+		}
+		fmt.Println(otp.OTP())
+		<-time.After(30 * time.Second)
+	}
+}