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"""Hostname."""
# standard
from functools import lru_cache
import re
from typing import Optional
from .domain import domain
# local
from .ip_address import ipv4, ipv6
from .utils import validator
@lru_cache
def _port_regex():
"""Port validation regex."""
return re.compile(
r"^\:(6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|"
+ r"6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3})$",
)
@lru_cache
def _simple_hostname_regex():
"""Simple hostname validation regex."""
# {0,59} because two characters are already matched at
# the beginning and at the end, making the range {1, 61}
return re.compile(r"^(?!-)[a-z0-9](?:[a-z0-9-]{0,59}[a-z0-9])?(?<!-)$", re.IGNORECASE)
def _port_validator(value: str):
"""Returns host segment if port is valid."""
if value.count("]:") == 1:
# with ipv6
host_seg, port_seg = value.rsplit(":", 1)
if _port_regex().match(f":{port_seg}"):
return host_seg.lstrip("[").rstrip("]")
if value.count(":") == 1:
# with ipv4 or simple hostname
host_seg, port_seg = value.rsplit(":", 1)
if _port_regex().match(f":{port_seg}"):
return host_seg
return None
@validator
def hostname(
value: str,
/,
*,
skip_ipv6_addr: bool = False,
skip_ipv4_addr: bool = False,
may_have_port: bool = True,
maybe_simple: bool = True,
consider_tld: bool = False,
private: Optional[bool] = None, # only for ip-addresses
rfc_1034: bool = False,
rfc_2782: bool = False,
):
"""Return whether or not given value is a valid hostname.
Examples:
>>> hostname("ubuntu-pc:443")
True
>>> hostname("this-pc")
True
>>> hostname("xn----gtbspbbmkef.xn--p1ai:65535")
True
>>> hostname("_example.com")
ValidationError(func=hostname, args={'value': '_example.com'})
>>> hostname("123.5.77.88:31000")
True
>>> hostname("12.12.12.12")
True
>>> hostname("[::1]:22")
True
>>> hostname("dead:beef:0:0:0:0000:42:1")
True
>>> hostname("[0:0:0:0:0:ffff:1.2.3.4]:-65538")
ValidationError(func=hostname, args={'value': '[0:0:0:0:0:ffff:1.2.3.4]:-65538'})
>>> hostname("[0:&:b:c:@:e:f::]:9999")
ValidationError(func=hostname, args={'value': '[0:&:b:c:@:e:f::]:9999'})
Args:
value:
Hostname string to validate.
skip_ipv6_addr:
When hostname string cannot be an IPv6 address.
skip_ipv4_addr:
When hostname string cannot be an IPv4 address.
may_have_port:
Hostname string may contain port number.
maybe_simple:
Hostname string maybe only hyphens and alpha-numerals.
consider_tld:
Restrict domain to TLDs allowed by IANA.
private:
Embedded IP address is public if `False`, private/local if `True`.
rfc_1034:
Allow trailing dot in domain/host name.
Ref: [RFC 1034](https://www.rfc-editor.org/rfc/rfc1034).
rfc_2782:
Domain/Host name is of type service record.
Ref: [RFC 2782](https://www.rfc-editor.org/rfc/rfc2782).
Returns:
(Literal[True]): If `value` is a valid hostname.
(ValidationError): If `value` is an invalid hostname.
"""
if not value:
return False
if may_have_port and (host_seg := _port_validator(value)):
return (
(_simple_hostname_regex().match(host_seg) if maybe_simple else False)
or domain(host_seg, consider_tld=consider_tld, rfc_1034=rfc_1034, rfc_2782=rfc_2782)
or (False if skip_ipv4_addr else ipv4(host_seg, cidr=False, private=private))
or (False if skip_ipv6_addr else ipv6(host_seg, cidr=False))
)
return (
(_simple_hostname_regex().match(value) if maybe_simple else False)
or domain(value, consider_tld=consider_tld, rfc_1034=rfc_1034, rfc_2782=rfc_2782)
or (False if skip_ipv4_addr else ipv4(value, cidr=False, private=private))
or (False if skip_ipv6_addr else ipv6(value, cidr=False))
)