34 lines
1.2 KiB
Python
34 lines
1.2 KiB
Python
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from django.core.validators import RegexValidator
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def _validator():
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ul = '\u00a1-\uffff' # unicode letters range (must not be a raw string)
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# IP patterns
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ipv4_re = r'(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}'
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ipv6_re = r'\[[0-9a-f:\.]+\]' # (simple regex, validated later)
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# Host patterns
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hostname_re = r'[a-z' + ul + \
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r'0-9](?:[a-z' + ul + r'0-9-]{0,61}[a-z' + ul + r'0-9])?'
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# Max length for domain name labels is 63 characters per RFC 1034 sec. 3.1
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domain_re = r'(?:\.(?!-)[a-z' + ul + r'0-9-]{1,63}(?<!-))*'
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tld_re = (
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r'\.' # dot
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r'(?!-)' # can't start with a dash
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r'(?:[a-z' + ul + '-]{2,63}' # domain label
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r'|xn--[a-z0-9]{1,59})' # or punycode label
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r'(?<!-)' # can't end with a dash
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r'\.?' # may have a trailing dot
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r'/?'
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)
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host_re = '(' + hostname_re + domain_re + tld_re + ')'
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regex = (
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r'(?:' + ipv4_re + '|' + ipv6_re + '|' + host_re + ')'
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r'(?::\d{2,5})?' # port
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r'\Z')
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return RegexValidator(regex, message='Enter a valid Domain (Not a URL)', code='invalid_domain')
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domain_name_validator = _validator()
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