#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# CRANS_UTILS.PY-- Utils for Cr@ns gestion
#
# Copyright (c) 2010, Cr@ns <roots@crans.org>
# Author: Antoine Durand-Gasselin <adg@crans.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# * Neither the name of the Cr@ns nor the names of its contributors may
#   be used to endorse or promote products derived from this software
#   without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import calendar, netaddr, re, time, smtplib, sys
sys.path.append('/usr/scripts/gestion')
import config
from unicodedata import normalize

def ip_of_mid(mid):
    """Convertit un mid en son IP associée"""
    for net, plage in config.mid.items():
        if mid >= plage[0] and mid <= plage[1]:
            break
    else:
        raise ValueError("Mid dans aucune plage: %d" % mid)

    return netaddr.IPAddress(netaddr.IPNetwork(config.NETs[net][0]).first + mid - plage[0])

def strip_accents(a):
    """ Supression des accents de la chaîne fournie"""
    res = normalize('NFKD', a).encode('ASCII', 'ignore')
    return unicode(res)

def strip_spaces(a):
    """ Suppression des espaces et des apostrophes"""
    return a.replace(u' ', u'_').replace(u"'", u'')

def mailexist(mail):
    """Vérifie si une adresse mail existe ou non grace à la commande
    vrfy du serveur mail """

    mail = mail.split('@', 1)[0]
#    try:
    s = smtplib.SMTP('smtp.adm.crans.org')
    s.putcmd("vrfy", mail)
    r = s.getreply()[0] in [250, 252]
    s.close()
#    except:
#        raise ValueError(u'Serveur de mail injoignable')

    return r

def format_ldap_time(tm):
    u"""Formatage des dates provenant de la base LDAP
    Transforme la date YYYYMMDDHHMMSS.XXXXXXZ (UTC)
    en date DD/MM/YY HH:MM (local)"""
    tm_st = time.strptime(tm.split('.')[0], "%Y%m%d%H%M%S") # struct_time UTC
    timestamp = calendar.timegm(tm_st)
    tm_st = time.localtime(timestamp) # struct_time locale
    return time.strftime("%d/%m/%Y %H:%M", tm_st)

def format_mac(mac):
    u""" Formatage des adresses mac
    Transforme une adresse pour obtenir la forme xx:xx:xx:xx:xx:xx
    Retourne la mac formatée.
    """
    mac = netaddr.EUI(mac)
    if not mac:
        raise ValueError(u"MAC nulle interdite\nIl doit être possible de modifier l'adresse de la carte.")
    return str(mac).replace('-', ':')

def format_tel(tel):
    u"""Formatage des numéros de téléphone
    Transforme un numéro de téléphone pour ne contenir que des chiffres
    (00ii... pour les numéros internationaux)
    Retourne le numéro formaté.
    """
    tel_f = tel.strip()
    if tel_f.startswith(u"+"):
        tel_f = u"00" + tel_f[1:]
    if u"(0)" in tel_f:
        tel_f = tel_f.replace(u"(0)", u"")
    tel_f = re.sub(r'\D', '', tel_f)
    return tel_f

def validate_name(value, more_chars=""):
    """Valide un nom: ie un unicode qui contient lettres, espaces et
    apostrophes, et éventuellement des caractères additionnels"""
    if re.match("^[A-Za-z0-9]([-' %s]?[A-Za-z0-9])*$" %  more_chars,
                normalize('NFKD', value).encode('ASCII', 'ignore')):
        return value
    else:
        raise ValueError("Nom invalide ('%s')" % value)

def ldap_sanitize(s):
    """ Échappe les caractères spéciaux ldap.
    (Si vous avez une méthode plus propre pour coder ça, je suis preneur)
    Todo: rajouter conversion pour caractère utf-8 multioctets ?
    (cf http://blog.dzhuvinov.com/?p=585 )
    """
    replace = {
        '*': '\\2a',
        '(': '\\28',
        ')': '\\29',
        '\\': '\\5c',
        '\x00': '\\00'}
    def conv(c):
        try: return replace[c]
        except KeyError: return c
    return "".join([conv(c) for c in s])