From a2bf05deb4128d1526d8763dea3d734816e2ab5d Mon Sep 17 00:00:00 2001
From: Chris O'Hara <cohara87@gmail.com>
Date: Sun, 13 Dec 2015 19:01:05 +1000
Subject: [PATCH] Allow triple hyphen in IDNA hostnames, closes #466

---
 CHANGELOG.md       | 5 +++++
 test/validators.js | 1 +
 validator.js       | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73649c413..42238437c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+#### HEAD
+
+- Allow triple hyphens in IDNA hostnames
+  ([#466](https://github.com/chriso/validator.js/issues/466))
+
 #### 4.4.0
 
 - Added `isMACAddress()` validator
diff --git a/test/validators.js b/test/validators.js
index c59f52e49..51a35b7f8 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -183,6 +183,7 @@ describe('Validators', function () {
               , 'http://foo--bar.com'
               , 'http://høyfjellet.no'
               , 'http://xn--j1aac5a4g.xn--j1amh'
+              , 'http://xn------eddceddeftq7bvv7c4ke4c.xn--p1ai'
               , 'http://кулік.укр'
             ]
           , invalid: [
diff --git a/validator.js b/validator.js
index 3efb5ef38..c9b4e6986 100644
--- a/validator.js
+++ b/validator.js
@@ -399,8 +399,10 @@
                 // disallow full-width chars
                 return false;
             }
-            if (part[0] === '-' || part[part.length - 1] === '-' ||
-                    part.indexOf('---') >= 0) {
+            if (part[0] === '-' || part[part.length - 1] === '-') {
+                return false;
+            }
+            if (part.indexOf('---') >= 0 && part.slice(0, 4) !== 'xn--') {
                 return false;
             }
         }