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|
import re
from .utils import validator
pattern = re.compile(
r'^(?:[a-zA-Z0-9]' # First character of the domain
r'(?:[a-zA-Z0-9-_]{0,61}[A-Za-z0-9])?\.)' # Sub domain + hostname
r'+[A-Za-z0-9][A-Za-z0-9-_]{0,61}' # First 61 characters of the gTLD
r'[A-Za-z]$' # Last character of the gTLD
)
def to_unicode(obj, charset='utf-8', errors='strict'):
if obj is None:
return None
if not isinstance(obj, bytes):
return str(obj)
return obj.decode(charset, errors)
@validator
def domain(value):
"""
Return whether or not given value is a valid domain.
If the value is valid domain name this function returns ``True``, otherwise
:class:`~validators.utils.ValidationFailure`.
Examples::
>>> domain('example.com')
True
>>> domain('example.com/')
ValidationFailure(func=domain, ...)
Supports IDN domains as well::
>>> domain('xn----gtbspbbmkef.xn--p1ai')
True
.. versionadded:: 0.9
.. versionchanged:: 0.10
Added support for internationalized domain name (IDN) validation.
:param value: domain string to validate
"""
try:
return pattern.match(to_unicode(value).encode('idna').decode('ascii'))
except (UnicodeError, AttributeError):
return False
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