def ascii_to_idn(host):
'''convert ACE (ASCII-compatible encoding) to IDN
(Internationalized Domain Names)'''
labels = idna.dots.split(host)
converted_labels = []
for label in labels:
converted_labels.append(idna.ToUnicode(label))
return ".".join(converted_labels)
def idn_to_unicode(s):
rv = []
for part in s.split('.'):
if part.startswith('xn--'):
rv.append(idna.ToUnicode(part))
else:
rv.append(part)
return '.'.join(rv)
def norm(self, valu, oldval=None):
valu = valu.replace('[.]', '.')
if not fqdnre.match(valu):
self._raiseBadValu(valu)
if valu.startswith('xn--'):
valu = idna.ToUnicode(valu)
valu = valu.lower()
parts = valu.split('.', 1)
subs = {'host': parts[0]}
if len(parts) == 2:
subs['domain'] = parts[1]
else:
subs['sfx'] = 1
return valu, subs
def _parse_labels(string):
try:
# Note: idna.ToASCII also enforces the minimum and maximum label length.
labels = tuple(idna.ToASCII(x).lower() for x in string.split(u"."))
except UnicodeError:
return None
if len(labels) + sum(len(x) for x in labels) > 253:
return None
if labels[-1].isdigit():
return None
if not all(_LABEL_REX.match(x) for x in labels):
return None
return tuple(idna.ToUnicode(x) for x in labels)
def mightDecode(s):
if s[:4] == "xn--":
return idna.ToUnicode(s)
return s
def decode(host):
# Used by cryptography/hazmat/backends/openssl/x509.py
return idna.ToUnicode(host)