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files >> //proc/thread-self/root/proc/self/root/opt/hc_python/lib64/python3.8/site-packages/dns/ttl.py
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license # Copyright (C) 2003-2017 Nominum, Inc. # # Permission to use, copy, modify, and distribute this software and its # documentation for any purpose with or without fee is hereby granted, # provided that the above copyright notice and this permission notice # appear in all copies. # # THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. """DNS TTL conversion.""" from typing import Union import dns.exception # Technically TTLs are supposed to be between 0 and 2**31 - 1, with values # greater than that interpreted as 0, but we do not impose this policy here # as values > 2**31 - 1 occur in real world data. # # We leave it to applications to impose tighter bounds if desired. MAX_TTL = 2**32 - 1 class BadTTL(dns.exception.SyntaxError): """DNS TTL value is not well-formed.""" def from_text(text: str) -> int: """Convert the text form of a TTL to an integer. The BIND 8 units syntax for TTLs (e.g. '1w6d4h3m10s') is supported. *text*, a ``str``, the textual TTL. Raises ``dns.ttl.BadTTL`` if the TTL is not well-formed. Returns an ``int``. """ if text.isdigit(): total = int(text) elif len(text) == 0: raise BadTTL else: total = 0 current = 0 need_digit = True for c in text: if c.isdigit(): current *= 10 current += int(c) need_digit = False else: if need_digit: raise BadTTL c = c.lower() if c == "w": total += current * 604800 elif c == "d": total += current * 86400 elif c == "h": total += current * 3600 elif c == "m": total += current * 60 elif c == "s": total += current else: raise BadTTL("unknown unit '%s'" % c) current = 0 need_digit = True if not current == 0: raise BadTTL("trailing integer") if total < 0 or total > MAX_TTL: raise BadTTL("TTL should be between 0 and 2**32 - 1 (inclusive)") return total def make(value: Union[int, str]) -> int: if isinstance(value, int): return value elif isinstance(value, str): return dns.ttl.from_text(value) else: raise ValueError("cannot convert value to TTL")
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