From eb55534c48f0640e18abb03119fe9861cf9ef957 Mon Sep 17 00:00:00 2001
From: AJ ONeal <awesome@coolaj86.com>
Date: Tue, 3 Nov 2015 00:02:32 -0800
Subject: [PATCH] add generateTotpUri()

---
 authenticator.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/authenticator.js b/authenticator.js
index d17e75b..33618c9 100644
--- a/authenticator.js
+++ b/authenticator.js
@@ -57,3 +57,15 @@ function verifyGoogleAuthToken(key, token) {
 module.exports.generateKey = generateGoogleAuthKey;
 module.exports.generateToken = generateGoogleAuthToken;
 module.exports.verifyToken = verifyGoogleAuthToken;
+module.exports.generateTotpUri = function (secret, accountName, issuer, algo, digits, period) {
+  // Full OTPAUTH URI spec as explained at
+  // https://github.com/google/google-authenticator/wiki/Key-Uri-Format
+  return 'otpauth://totp/'
+    + encodeURI(issuer || '') + ':' + encodeURI(accountName || '')
+    + '?secret=' + secret.replace(/[\s\.\_\-]+/g, '').toUpperCase()
+    + '&issuer=' + encodeURIComponent(issuer || '')
+    + '&algorithm=' + (algo || 'SHA1')
+    + '&digits=' + (digits || 6)
+    + '&period=' + (period || 30)
+    ;  
+};