%PDF- %PDF-
Direktori : /lib/python3.6/site-packages/dns/ |
Current File : //lib/python3.6/site-packages/dns/ttl.py |
# Copyright (C) 2003-2007, 2009-2011 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.""" import dns.exception from ._compat import long class BadTTL(dns.exception.SyntaxError): """DNS TTL value is not well-formed.""" def from_text(text): """Convert the text form of a TTL to an integer. The BIND 8 units syntax for TTLs (e.g. '1w6d4h3m10s') is supported. @param text: the textual TTL @type text: string @raises dns.ttl.BadTTL: the TTL is not well-formed @rtype: int """ if text.isdigit(): total = long(text) else: if not text[0].isdigit(): raise BadTTL total = long(0) current = long(0) for c in text: if c.isdigit(): current *= 10 current += long(c) else: c = c.lower() if c == 'w': total += current * long(604800) elif c == 'd': total += current * long(86400) elif c == 'h': total += current * long(3600) elif c == 'm': total += current * long(60) elif c == 's': total += current else: raise BadTTL("unknown unit '%s'" % c) current = 0 if not current == 0: raise BadTTL("trailing integer") if total < long(0) or total > long(2147483647): raise BadTTL("TTL should be between 0 and 2^31 - 1 (inclusive)") return total