From 041bd63864429ac74ff7b7e267a0a96b04553383 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Thu, 20 Aug 2015 20:03:32 +0100
Subject: Add a function to convert a domain name to punycode.

---
 slixmpp/stringprep.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'slixmpp/stringprep.py')

diff --git a/slixmpp/stringprep.py b/slixmpp/stringprep.py
index e0757ef2..99506d78 100644
--- a/slixmpp/stringprep.py
+++ b/slixmpp/stringprep.py
@@ -101,5 +101,21 @@ def idna(domain):
         domain_parts.append(label)
     return '.'.join(domain_parts)
 
+def punycode(domain):
+    domain_parts = []
+    for label in domain.split('.'):
+        try:
+            label = encodings.idna.nameprep(label)
+            encodings.idna.ToASCII(label)
+        except UnicodeError:
+            raise StringprepError
+
+        for char in label:
+            if char in ILLEGAL_CHARS:
+                raise StringprepError
+
+        domain_parts.append(label)
+    return b'.'.join(domain_parts)
+
 logging.getLogger(__name__).warning('Using slower stringprep, consider '
                                     'compiling the faster cython/libidn one.')
-- 
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