interact: pull out authentication interaction

examples/interact/main.go

@@ -128,7 +128,12 @@ func main() {
 
 	globalInteraction := interact.New()
 	globalInteraction.SetMessenger(&interact.Telegram{
-		Bot:      b,
+		Bot: b,
+	})
+
+	globalInteraction.AddCustomInteraction(&interact.AuthInteract{
+		Mode:  interact.AuthModeToken,
+		Token: "123",
 	})
 
 	globalInteraction.AddCustomInteraction(&PositionInteraction{})

pkg/interact/auth.go

@@ -0,0 +1,47 @@
+package interact
+
+import (
+	"errors"
+
+	"github.com/pquerna/otp"
+)
+
+type AuthMode string
+
+const (
+	AuthModeOTP   AuthMode = "OTP"
+	AuthModeToken AuthMode = "TOKEN"
+)
+
+var ErrAuthenticationFailed = errors.New("authentication failed")
+
+type AuthInteract struct {
+	Mode AuthMode `json:"authMode"`
+
+	Token string `json:"authToken,omitempty"`
+
+	OneTimePasswordKey *otp.Key `json:"otpKey,omitempty"`
+}
+
+func (i *AuthInteract) Commands(interact *Interact) {
+	interact.Command("/auth", func(reply Reply) error {
+		reply.Message("Enter your authentication code")
+		return nil
+	}).NamedNext(StateAuthenticated, func(reply Reply, code string) error {
+		switch i.Mode {
+		case AuthModeToken:
+			if code == i.Token {
+				reply.Message("Great! You're authenticated!")
+				return nil
+			} else {
+				reply.Message("Incorrect authentication code")
+				return ErrAuthenticationFailed
+			}
+
+		case AuthModeOTP:
+
+		}
+
+		return nil
+	})
+}

pkg/interact/interact.go

@@ -187,15 +187,6 @@ func (i *Interact) SetMessenger(messenger Messenger) {
 
 // builtin initializes the built-in commands
 func (i *Interact) builtin() error {
-	i.Command("/auth", func(reply Reply) error {
-		reply.Message("Enter your authentication code")
-		return nil
-	}).NamedNext(StateAuthenticated, func(reply Reply, code string) error {
-		// check code
-		reply.Message("Great! You're authenticated!")
-		return nil
-	})
-
 	i.Command("/uptime", func(reply Reply) error {
 		reply.Message("uptime")
 		return nil