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import re
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class ValidationFailure(BaseException):
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"""
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class for Validation exceptions
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"""
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domain_pattern = re.compile(
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r'^(([a-zA-Z]{1})|([a-zA-Z]{1}[a-zA-Z]{1})|'
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r'([a-zA-Z]{1}[0-9]{1})|([0-9]{1}[a-zA-Z]{1})|'
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r'([a-zA-Z0-9][-_.a-zA-Z0-9]{0,61}[a-zA-Z0-9]))\.'
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r'([a-zA-Z]{2,13}|[a-zA-Z0-9-]{2,30}.[a-zA-Z]{2,3})$'
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)
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def domain(value, raise_errors=True):
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"""
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Return whether or not given value is a valid domain.
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If the value is valid domain name this function returns ``True``, otherwise
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:class:`~validators.ValidationFailure` or False if raise_errors muted.
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Examples::
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>>> domain('example.com')
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True
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>>> domain('example.com/')
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ValidationFailure(func=domain, ...)
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Supports IDN domains as well::
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>>> domain('xn----gtbspbbmkef.xn--p1ai')
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True
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:param value: domain string to validate
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:param raise_errors: raise errors or return False
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"""
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if domain_pattern.match(value) is None:
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if raise_errors:
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raise ValidationFailure("{} is not valid domain".format(value))
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else:
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return False
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return True
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