Sheng
63 lines
1.2 KiB
Python
63 lines
1.2 KiB
Python
import ipaddress
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import re
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try:
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from types import UnicodeType
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except ImportError:
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UnicodeType = str
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numeric = re.compile(r'[0-9]+$')
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allowed = re.compile(r'(?!-)[a-z0-9-]{1,63}(?<!-)$', re.IGNORECASE)
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def to_str(bstr, encoding='utf-8'):
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if isinstance(bstr, bytes):
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return bstr.decode(encoding)
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return bstr
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def to_bytes(ustr, encoding='utf-8'):
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if isinstance(ustr, UnicodeType):
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return ustr.encode(encoding)
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return ustr
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def to_int(string):
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try:
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return int(string)
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except (TypeError, ValueError):
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pass
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def to_ip_address(ipstr):
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return ipaddress.ip_address(to_str(ipstr))
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def is_valid_ip_address(ipstr):
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try:
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to_ip_address(ipstr)
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except ValueError:
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return False
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return True
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def is_valid_port(port):
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return 0 < port < 65536
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def is_valid_hostname(hostname):
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if hostname[-1] == '.':
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# strip exactly one dot from the right, if present
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hostname = hostname[:-1]
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if len(hostname) > 253:
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return False
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labels = hostname.split('.')
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# the TLD must be not all-numeric
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if numeric.match(labels[-1]):
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return False
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return all(allowed.match(label) for label in labels)
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