interact: improve strict mode authentication

examples/interact/main.go

@@ -135,6 +135,7 @@ func main() {
 	})
 
 	globalInteraction.AddCustomInteraction(&interact.AuthInteract{
+		Strict: true,
 		Mode:  interact.AuthModeToken,
 		Token: "123",
 	})

pkg/interact/auth.go

@@ -2,9 +2,12 @@ package interact
 
 import (
 	"errors"
+	"os"
+	"time"
 
 	"github.com/pquerna/otp"
 	"github.com/pquerna/otp/totp"
+	log "github.com/sirupsen/logrus"
 )
 
 type AuthMode string
@@ -32,14 +35,39 @@ type AuthInteract struct {
 
 func (it *AuthInteract) Commands(interact *Interact) {
 	if it.Strict {
+		// generate a one-time-use otp
+		if it.OneTimePasswordKey == nil {
+			opts := totp.GenerateOpts{
+				Issuer:      "interact",
+				AccountName: os.Getenv("USER"),
+				Period:      30,
+			}
+			log.Infof("[interact] one-time password key is not configured, generating one with %+v", opts)
+			key, err := totp.Generate(opts)
+			if err != nil {
+				panic(err)
+			}
+
+			it.OneTimePasswordKey = key
+		}
 		interact.Command("/auth", func(reply Reply) error {
 			reply.Message("Enter your authentication token")
 			return nil
 		}).Next(func(token string, reply Reply) error {
 			if token == it.Token {
 				reply.Message("Token passed, please enter your one-time password")
+
+				code, err := totp.GenerateCode(it.OneTimePasswordKey.Secret(), time.Now())
+				if err != nil {
+					return err
+				}
+
+				log.Infof("[interact] ======================================")
+				log.Infof("[interact] your one-time password code: %s", code)
+				log.Infof("[interact] ======================================")
 				return nil
 			}
+
 			return ErrAuthenticationFailed
 		}).NamedNext(StateAuthenticated, func(code string, reply Reply, authorizer Authorizer) error {
 			if totp.Validate(code, it.OneTimePasswordKey.Secret()) {