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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
############################################################################

import os
import time
import calendar
from subprocess import Popen, PIPE

########################################################################
# Class dnskey
########################################################################
class TimePast(Exception):
    def __init__(self, key, prop, value):
        super(TimePast, self).__init__('%s time for key %s (%d) is already past'
                                       % (prop, key, value))

class dnskey:
    """An individual DNSSEC key.  Identified by path, name, algorithm, keyid.
    Contains a dictionary of metadata events."""

    _PROPS = ('Created', 'Publish', 'Activate', 'Inactive', 'Delete',
              'Revoke', 'DSPublish', 'SyncPublish', 'SyncDelete')
    _OPTS = (None, '-P', '-A', '-I', '-D', '-R', None, '-Psync', '-Dsync')

    _ALGNAMES = (None, 'RSAMD5', 'DH', 'DSA', 'ECC', 'RSASHA1',
                 'NSEC3DSA', 'NSEC3RSASHA1', 'RSASHA256', None,
                 'RSASHA512', None, 'ECCGOST', 'ECDSAP256SHA256',
                 'ECDSAP384SHA384', 'ED25519', 'ED448')

    def __init__(self, key, directory=None, keyttl=None):
        # this makes it possible to use algname as a class or instance method
        if isinstance(key, tuple) and len(key) == 3:
            self._dir = directory or '.'
            (name, alg, keyid) = key
            self.fromtuple(name, alg, keyid, keyttl)

        self._dir = directory or os.path.dirname(key) or '.'
        key = os.path.basename(key)
        (name, alg, keyid) = key.split('+')
        name = name[1:-1]
        alg = int(alg)
        keyid = int(keyid.split('.')[0])
        self.fromtuple(name, alg, keyid, keyttl)

    def fromtuple(self, name, alg, keyid, keyttl):
        if name.endswith('.'):
            fullname = name
            name = name.rstrip('.')
        else:
            fullname = name + '.'

        keystr = "K%s+%03d+%05d" % (fullname, alg, keyid)
        key_file = self._dir + (self._dir and os.sep or '') + keystr + ".key"
        private_file = (self._dir + (self._dir and os.sep or '') +
                        keystr + ".private")

        self.keystr = keystr

        self.name = name
        self.alg = int(alg)
        self.keyid = int(keyid)
        self.fullname = fullname

        kfp = open(key_file, "r")
        for line in kfp:
            if line[0] == ';':
                continue
            tokens = line.split()
            if not tokens:
                continue

            if tokens[1].lower() in ('in', 'ch', 'hs'):
                septoken = 3
                self.ttl = keyttl
            else:
                septoken = 4
                self.ttl = int(tokens[1]) if not keyttl else keyttl

            if (int(tokens[septoken]) & 0x1) == 1:
                self.sep = True
            else:
                self.sep = False
        kfp.close()

        pfp = open(private_file, "rU")

        self.metadata = dict()
        self._changed = dict()
        self._delete = dict()
        self._times = dict()
        self._fmttime = dict()
        self._timestamps = dict()
        self._original = dict()
        self._origttl = None

        for line in pfp:
            line = line.strip()
            if not line or line[0] in ('!#'):
                continue
            punctuation = [line.find(c) for c in ':= '] + [len(line)]
            found = min([pos for pos in punctuation if pos != -1])
            name = line[:found].rstrip()
            value = line[found:].lstrip(":= ").rstrip()