#! /usr/bin/python
# Copyright (C) 2005 Guwashi <guwashi[AT]fooos[DOT]com>
#
# This library 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 2.1 of the License, or (at your option) any later version.
#
# This library 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 library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# This code is based on
# http://www.maxmind.com/app/python
# http://www.maxmind.com/download/geoip/api/pureperl

import re
import struct

def nreverse(sequence):
    """nreverse in Common Lisp. :)"""
    if hasattr(sequence, 'reverse'):
        sequence.reverse()
        return sequence
    else:
        # For range objects in Python 3
        return list(reversed(sequence))

class GeoIP(object):

    fh = None
    record_length = None
    databaseSegments = None

    __STANDARD_RECORD_LENGTH = 3
    __GEOIP_COUNTRY_EDITION = 106
    __GEOIP_COUNTRY_BEGIN = 16776960

    __COUNTRIES = ('--','AP','EU','AD','AE','AF','AG','AI','AL','AM','AN','AO','AQ','AR','AS','AT','AU','AW','AZ','BA',
                   'BB','BD','BE','BF','BG','BH','BI','BJ','BM','BN','BO','BR','BS','BT','BV','BW','BY','BZ','CA','CC',
                   'CD','CF','CG','CH','CI','CK','CL','CM','CN','CO','CR','CU','CV','CX','CY','CZ','DE','DJ','DK','DM',
                   'DO','DZ','EC','EE','EG','EH','ER','ES','ET','FI','FJ','FK','FM','FO','FR','FX','GA','GB','GD','GE',
                   'GF','GH','GI','GL','GM','GN','GP','GQ','GR','GS','GT','GU','GW','GY','HK','HM','HN','HR','HT','HU',
                   'ID','IE','IL','IN','IO','IQ','IR','IS','IT','JM','JO','JP','KE','KG','KH','KI','KM','KN','KP','KR',
                   'KW','KY','KZ','LA','LB','LC','LI','LK','LR','LS','LT','LU','LV','LY','MA','MC','MD','MG','MH','MK',
                   'ML','MM','MN','MO','MP','MQ','MR','MS','MT','MU','MV','MW','MX','MY','MZ','NA','NC','NE','NF','NG',
                   'NI','NL','NO','NP','NR','NU','NZ','OM','PA','PE','PF','PG','PH','PK','PL','PM','PN','PR','PS','PT',
                   'PW','PY','QA','RE','RO','RU','RW','SA','SB','SC','SD','SE','SG','SH','SI','SJ','SK','SL','SM','SN',
                   'SO','SR','ST','SV','SY','SZ','TC','TD','TF','TG','TH','TJ','TK','TM','TN','TO','TP','TR','TT','TV',
                   'TW','TZ','UA','UG','UM','US','UY','UZ','VA','VC','VE','VG','VI','VN','VU','WF','WS','YE','YT','YU',
                   'ZA','ZM','ZR','ZW','A1','A2')
    __CODE3S = ('--','AP','EU','AND','ARE','AFG','ATG','AIA','ALB','ARM','ANT','AGO','AQ','ARG','ASM','AUT','AUS','ABW',
                'AZE','BIH','BRB','BGD','BEL','BFA','BGR','BHR','BDI','BEN','BMU','BRN','BOL','BRA','BHS','BTN','BV',
                'BWA','BLR','BLZ','CAN','CC','COD','CAF','COG','CHE','CIV','COK','CHL','CMR','CHN','COL','CRI','CUB',
                'CPV','CX','CYP','CZE','DEU','DJI','DNK','DMA','DOM','DZA','ECU','EST','EGY','ESH','ERI','ESP','ETH',
                'FIN','FJI','FLK','FSM','FRO','FRA','FX','GAB','GBR','GRD','GEO','GUF','GHA','GIB','GRL','GMB','GIN',
                'GLP','GNQ','GRC','GS','GTM','GUM','GNB','GUY','HKG','HM','HND','HRV','HTI','HUN','IDN','IRL','ISR',
                'IND','IO','IRQ','IRN','ISL','ITA','JAM','JOR','JPN','KEN','KGZ','KHM','KIR','COM','KNA','PRK','KOR',
                'KWT','CYM','KAZ','LAO','LBN','LCA','LIE','LKA','LBR','LSO','LTU','LUX','LVA','LBY','MAR','MCO','MDA',
                'MDG','MHL','MKD','MLI','MMR','MNG','MAC','MNP','MTQ','MRT','MSR','MLT','MUS','MDV','MWI','MEX','MYS',
                'MOZ','NAM','NCL','NER','NFK','NGA','NIC','NLD','NOR','NPL','NRU','NIU','NZL','OMN','PAN','PER','PYF',
                'PNG','PHL','PAK','POL','SPM','PCN','PRI','PSE','PRT','PLW','PRY','QAT','REU','ROM','RUS','RWA','SAU',
                'SLB','SYC','SDN','SWE','SGP','SHN','SVN','SJM','SVK','SLE','SMR','SEN','SOM','SUR','STP','SLV','SYR',
                'SWZ','TCA','TCD','TF','TGO','THA','TJK','TKL','TLS','TKM','TUN','TON','TUR','TTO','TUV','TWN','TZA',
                'UKR','UGA','UM','USA','URY','UZB','VAT','VCT','VEN','VGB','VIR','VNM','VUT','WLF','WSM','YEM','YT',
                'YUG','ZAF','ZMB','ZR','ZWE','A1','A2')
    __NAMES = ("--","Asia/Pacific Region","Europe","Andorra","United Arab Emirates","Afghanistan","Antigua and Barbuda",
               "Anguilla","Albania","Armenia","Netherlands Antilles","Angola","Antarctica","Argentina","American Samoa",
               "Austria","Australia","Aruba","Azerbaijan","Bosnia and Herzegovina","Barbados","Bangladesh","Belgium",
               "Burkina Faso","Bulgaria","Bahrain","Burundi","Benin","Bermuda","Brunei Darussalam","Bolivia","Brazil",
               "Bahamas","Bhutan","Bouvet Island","Botswana","Belarus","Belize","Canada","Cocos (Keeling) Islands",
               "Congo, The Democratic Republic of the","Central African Republic","Congo","Switzerland","Cote D'Ivoire",
               "Cook Islands","Chile","Cameroon","China","Colombia","Costa Rica","Cuba","Cape Verde","Christmas Island",
               "Cyprus","Czech Republic","Germany","Djibouti","Denmark","Dominica","Dominican Republic","Algeria",
               "Ecuador","Estonia","Egypt","Western Sahara","Eritrea","Spain","Ethiopia","Finland","Fiji",
               "Falkland Islands (Malvinas)","Micronesia, Federated States of","Faroe Islands","France",
               "France, Metropolitan","Gabon","United Kingdom","Grenada","Georgia","French Guiana","Ghana","Gibraltar",
               "Greenland","Gambia","Guinea","Guadeloupe","Equatorial Guinea","Greece",
               "South Georgia and the South Sandwich Islands","Guatemala","Guam","Guinea-Bissau","Guyana","Hong Kong",
               "Heard Island and McDonald Islands","Honduras","Croatia","Haiti","Hungary","Indonesia","Ireland","Israel",
               "India","British Indian Ocean Territory","Iraq","Iran, Islamic Republic of","Iceland","Italy","Jamaica",
               "Jordan","Japan","Kenya","Kyrgyzstan","Cambodia","Kiribati","Comoros","Saint Kitts and Nevis",
               "Korea, Democratic People's Republic of","Korea, Republic of","Kuwait","Cayman Islands","Kazakhstan",
               "Lao People's Democratic Republic","Lebanon","Saint Lucia","Liechtenstein","Sri Lanka","Liberia","Lesotho",
               "Lithuania","Luxembourg","Latvia","Libyan Arab Jamahiriya","Morocco","Monaco","Moldova, Republic of",
               "Madagascar","Marshall Islands","Macedonia","Mali","Myanmar","Mongolia","Macau","Northern Mariana Islands",
               "Martinique","Mauritania","Montserrat","Malta","Mauritius","Maldives","Malawi","Mexico","Malaysia",
               "Mozambique","Namibia","New Caledonia","Niger","Norfolk Island","Nigeria","Nicaragua","Netherlands",
               "Norway","Nepal","Nauru","Niue","New Zealand","Oman","Panama","Peru","French Polynesia","Papua New Guinea",
               "Philippines","Pakistan","Poland","Saint Pierre and Miquelon","Pitcairn Islands","Puerto Rico",
               "Palestinian Territory, Occupied","Portugal","Palau","Paraguay","Qatar","Reunion","Romania",
               "Russian Federation","Rwanda","Saudi Arabia","Solomon Islands","Seychelles","Sudan","Sweden","Singapore",
               "Saint Helena","Slovenia","Svalbard and Jan Mayen","Slovakia","Sierra Leone","San Marino","Senegal","Somalia",
               "Suriname","Sao Tome and Principe","El Salvador","Syrian Arab Republic","Swaziland","Turks and Caicos Islands",
               "Chad","French Southern Territories","Togo","Thailand","Tajikistan","Tokelau","Turkmenistan","Tunisia",
               "Tonga","East Timor","Turkey","Trinidad and Tobago","Tuvalu","Taiwan","Tanzania, United Republic of",
               "Ukraine","Uganda","United States Minor Outlying Islands","United States","Uruguay","Uzbekistan",
               "Holy See (Vatican City State)","Saint Vincent and the Grenadines","Venezuela","Virgin Islands, British",
               "Virgin Islands, U.S.","Vietnam","Vanuatu","Wallis and Futuna","Samoa","Yemen","Mayotte","Yugoslavia",
               "South Africa","Zambia","Zaire","Zimbabwe", "Anonymous Proxy","Satellite Provider")

    __RE_IP_DOTTED_FORM = re.compile(r"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$")

    GEOIP_STANDARD = 0 # TODO

    @staticmethod
    def addr_to_num(ip_address):
        """Convert IP-address to number."""
        # a = [int(s) for s in re.split('\.', ip_address)]
        a = list(map(int, re.split(r'\.', ip_address)))
        return a[0] * 16777216 + a[1] * 65536 + a[2] * 256 + a[3]

    @staticmethod
    def open(db_file, flags):
        """Create a new GeoIP object."""
        gi = GeoIP()
        gi.db_file = db_file
        gi.flags = flags # TODO
        gi.fh = open(db_file, 'rb')
        gi.databaseType = GeoIP.__GEOIP_COUNTRY_EDITION # TODO
        gi.record_length = GeoIP.__STANDARD_RECORD_LENGTH # TODO
        gi.databaseSegments = GeoIP.__GEOIP_COUNTRY_BEGIN # TODO
        return gi

    @staticmethod
    def new(db_file, flags):
        """Create a new GeoIP object."""
        return GeoIP.open(db_file, flags)

    def __seek_country(self, ipnum):
        """Seek GeoIP data file to find country id."""
        fh = self.fh
        record_length = self.record_length
        databaseSegments = self.databaseSegments
        offset = 0
        for depth in nreverse(range(32)):
            fh.seek(offset * 2 * record_length, 0)
            x0 = fh.read(record_length)
            x1 = fh.read(record_length)
            x0, = struct.unpack("<1l", x0 + b"\0")
            x1, = struct.unpack("<1l", x1 + b"\0")
            if ipnum & (1 << depth):
                if x1 >= databaseSegments:
                    return x1
                offset = x1
            else:
                if x0 >= databaseSegments:
                    return x0
                offset = x0
        raise Exception('error traversing db for ipnum = %d - perhaps db is corrupt?' % ipnum) # TODO

    def id_by_addr(self, ip_address):
        """Find country id by IP-address."""
        if self.__RE_IP_DOTTED_FORM.match(ip_address):
            return self.__seek_country(self.addr_to_num(ip_address)) - self.__GEOIP_COUNTRY_BEGIN
        else:
            return 0

    @staticmethod
    def id_to_country_code(v):
        """Convert country id to country code."""
        return GeoIP.__COUNTRIES[v]

    @staticmethod
    def id_to_country_code3(v):
        """Convert country id to country code."""
        return GeoIP.__CODE3S[v]

    @staticmethod
    def id_to_country_name(v):
        """Convert country id to country code."""
        return GeoIP.__NAMES[v]

    def country_code_by_addr(self, v):
        """Find country code by IP-address."""
        return GeoIP.id_to_country_code(self.id_by_addr(v))

    def country_code3_by_addr(self, v):
        """Find country code3 by IP-address."""
        return GeoIP.id_to_country_code3(self.id_by_addr(v))

    def country_name_by_addr(self, v):
        """Find country name by IP-address."""
        return GeoIP.id_to_country_name(self.id_by_addr(v))