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# Authors:
#   Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
Various utility functions.
"""

from __future__ import (
    absolute_import,
    print_function,
)

import os
import socket
import re
import decimal
import dns
import encodings
import sys
from weakref import WeakKeyDictionary

import netaddr
from dns import resolver, rdatatype
from dns.exception import DNSException
from dns.resolver import NXDOMAIN
from netaddr.core import AddrFormatError
import six

from ipalib import errors, messages
from ipalib.constants import DOMAIN_LEVEL_0
from ipalib.text import _
from ipapython.ssh import SSHPublicKey
from ipapython.dn import DN, RDN
from ipapython.dnsutil import DNSName
from ipapython.dnsutil import resolve_ip_addresses
from ipapython.ipa_log_manager import root_logger

if six.PY3:
    unicode = str


def json_serialize(obj):
    if isinstance(obj, (list, tuple)):
        return [json_serialize(o) for o in obj]
    if isinstance(obj, dict):
        return {k: json_serialize(v) for (k, v) in obj.items()}
    if isinstance(obj, (bool, float, unicode, type(None), six.integer_types)):
        return obj
    if isinstance(obj, str):
        return obj.decode('utf-8')
    if isinstance(obj, (decimal.Decimal, DN)):
        return str(obj)
    if not callable(getattr(obj, '__json__', None)):
        # raise TypeError('%r is not JSON serializable')
        return ''
    return json_serialize(obj.__json__())


def verify_host_resolvable(fqdn):
    try:
        if not resolve_ip_addresses(fqdn):
            raise errors.DNSNotARecordError(hostname=fqdn)
    except dns.exception.DNSException as ex:
        # wrap DNSException in a PublicError
        raise errors.DNSResolverError(exception=ex)


def has_soa_or_ns_record(domain):
    """
    Checks to see if given domain has SOA or NS record.
    Returns True or False.
    """
    try:
        resolver.query(domain, rdatatype.SOA)
        soa_record_found = True
    except DNSException:
        soa_record_found = False

    try:
        resolver.query(domain, rdatatype.NS)
        ns_record_found = True
    except DNSException:
        ns_record_found = False

    return soa_record_found or ns_record_found


def normalize_name(name):
    result = dict()
    components = name.split('@')
    if len(components) == 2:
        result['domain'] = unicode(components[1]).lower()
        result['name'] = unicode(components[0]).lower()
    else:
        components = name.split('\\')
        if len(components) == 2:
            result['flatname'] = unicode(components[0]).lower()
            result['name'] = unicode(components[1]).lower()
        else:
            result['name'] = unicode(name).lower()
    return result

def isvalid_base64(data):
    """
    Validate the incoming data as valid base64 data or not.

    The character set must only include of a-z, A-Z, 0-9, + or / and
    be padded with = to be a length divisible by 4 (so only 0-2 =s are
    allowed). Its length must be divisible by 4. White space is
    not significant so it is removed.

    This doesn't guarantee we have a base64-encoded value, just that it
    fits the base64 requirements.
    """

    data = ''.join(data.split())

    if len(data) % 4 > 0 or \
        re.match('^[a-zA-Z0-9\+\/]+\={0,2}$', data) is None:
        return False
    else:
        return True

def validate_ipaddr(ipaddr):
    """
    Check to see if the given IP address is a valid IPv4 or IPv6 address.

    Returns True or False
    """
    try:
        socket.inet_pton(socket.AF_INET, ipaddr)
    except socket.error:
        try:
            socket.inet_pton(socket.AF_INET6, ipaddr)
        except socket.error:
            return False
    return True

def check_writable_file(filename):
    """
    Determine if the file is writable. If the file doesn't exist then
    open the file to test writability.
    """
    if filename is None:
        raise errors.FileError(reason=_('Filename is empty'))
    try:
        if os.path.exists(filename):
            if not os.access(filename, os.W_OK):
                raise errors.FileError(reason=_('Permission denied: %(file)s') % dict(file=filename))
        else:
            fp = open(filename, 'w')
            fp.close()
    except (IOError, OSError) as e:
        raise errors.FileError(reason=str(e))

def normalize_zonemgr(zonemgr):
    if not zonemgr or not isinstance(zonemgr, six.string_types):
        return zonemgr
    if '@' in zonemgr:
        # local-part needs to be normalized
        name, _at, domain = zonemgr.partition('@')
        name = name.replace('.', '\\.')
        zonemgr = u''.join((name, u'.', domain))

    return zonemgr

def normalize_zone(zone):
    if zone[-1] != '.':
        return zone + '.'
    else:
        return zone


def validate_dns_label(dns_label, allow_underscore=False, allow_slash=False):
    base_chars = 'a-z0-9'
    extra_chars = ''
    middle_chars = ''

    if allow_underscore:
        extra_chars += '_'
    if allow_slash:
        middle_chars += '/'

    middle_chars = middle_chars + '-' #has to be always the last in the regex [....-]

    label_regex = r'''^[%(base)s%(extra)s] # must begin with an alphanumeric
                                           # character, or underscore if
                                           # allow_underscore is True
        ([%(base)s%(extra)s%(middle)s]*    # can contain all allowed character
                                           # classes in the middle
        [%(base)s%(extra)s])*$             # must end with alphanumeric
                                           # character or underscore if
                                           # allow_underscore is True
        ''' % dict(base=base_chars, extra=extra_chars, middle=middle_chars)
    regex = re.compile(label_regex, re.IGNORECASE | re.VERBOSE)

    if not dns_label:
        raise ValueError(_('empty DNS label'))

    if len(dns_label) > 63:
        raise ValueError(_('DNS label cannot be longer that 63 characters'))

    if not regex.match(dns_label):
        chars = ', '.join("'%s'" % c for c in extra_chars + middle_chars)
        chars2 = ', '.join("'%s'" % c for c in middle_chars)
        raise ValueError(_("only letters, numbers, %(chars)s are allowed. " \
                           "DNS label may not start or end with %(chars2)s") \
                           % dict(chars=chars, chars2=chars2))


def validate_domain_name(domain_name, allow_underscore=False, allow_slash=False):
    if domain_name.endswith('.'):
        domain_name = domain_name[:-1]

    domain_name = domain_name.split(".")

    # apply DNS name validator to every name part
    for label in domain_name:
        validate_dns_label(label, allow_underscore, allow_slash)


def validate_zonemgr(zonemgr):
    assert isinstance(zonemgr, DNSName)
    if any('@' in label for label in zonemgr.labels):
        raise ValueError(_('too many \'@\' characters'))


def validate_zonemgr_str(zonemgr):
    zonemgr = normalize_zonemgr(zonemgr)
    validate_idna_domain(zonemgr)
    zonemgr = DNSName(zonemgr)
    return validate_zonemgr(zonemgr)

def validate_hostname(hostname, check_fqdn=True, allow_underscore=False, allow_slash=False):
    """ See RFC 952, 1123

    :param hostname Checked value
    :param check_fqdn Check if hostname is fully qualified
    """
    if len(hostname) > 255:
        raise ValueError(_('cannot be longer that 255 characters'))

    if hostname.endswith('.'):
        hostname = hostname[:-1]

    if '..' in hostname:
        raise ValueError(_('hostname contains empty label (consecutive dots)'))

    if '.' not in hostname:
        if check_fqdn:
            raise ValueError(_('not fully qualified'))
        validate_dns_label(hostname, allow_underscore, allow_slash)
    else:
        validate_domain_name(hostname, allow_underscore, allow_slash)

def normalize_sshpubkey(value):
    return SSHPublicKey(value).openssh()

def validate_sshpubkey(ugettext, value):
    try:
        SSHPublicKey(value)
    except (ValueError, UnicodeDecodeError):
        return _('invalid SSH public key')

def validate_sshpubkey_no_options(ugettext, value):
    try:
        pubkey = SSHPublicKey(value)
    except (ValueError, UnicodeDecodeError):
        return _('invalid SSH public key')

    if pubkey.has_options():
        return _('options are not allowed')


def convert_sshpubkey_post(entry_attrs):
    pubkeys = entry_attrs.get('ipasshpubkey')
    if not pubkeys:
        return

    newpubkeys = []
    fingerprints = []
    for pubkey in pubkeys:
        try:
            pubkey = SSHPublicKey(pubkey)
        except (ValueError, UnicodeDecodeError):
            continue

        fp = pubkey.fingerprint_hex_md5()
        comment = pubkey.comment()
        if comment:
            fp = u'%s %s' % (fp, comment)
        fp = u'%s (%s)' % (fp, pubkey.keytype())

        newpubkeys.append(pubkey.openssh())


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