from django.conf import settings


# Search for the real IP address in the following order
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For
# X-Forwarded-For: <client>, <proxy1>, <proxy2>
# Configurable via settings.py
IPWARE_META_PRECEDENCE_ORDER = getattr(settings,
    'IPWARE_META_PRECEDENCE_ORDER', (
        'HTTP_X_FORWARDED_FOR', 'X_FORWARDED_FOR',
        'HTTP_CLIENT_IP',
        'HTTP_X_REAL_IP',
        'HTTP_X_FORWARDED',
        'HTTP_X_CLUSTER_CLIENT_IP',
        'HTTP_FORWARDED_FOR',
        'HTTP_FORWARDED',
        'HTTP_VIA',
        'REMOTE_ADDR',
    )
)

# Private IP addresses
# http://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks
# https://en.wikipedia.org/wiki/Reserved_IP_addresses
# https://www.ietf.org/rfc/rfc1112.txt (IPv4 multicast)
# http://www.ietf.org/rfc/rfc3330.txt (IPv4)
# http://www.ietf.org/rfc/rfc5156.txt (IPv6)
# https://www.ietf.org/rfc/rfc6890.txt
# Regex would be ideal here, but this is keeping it simple
# Configurable via settings.py
IPWARE_PRIVATE_IP_PREFIX = getattr(settings,
    'IPWARE_PRIVATE_IP_PREFIX', (
        '0.',  # messages to software
        '10.',  # class A private block
        '100.64.',  '100.65.',  '100.66.',  '100.67.',  '100.68.',  '100.69.',
        '100.70.',  '100.71.',  '100.72.',  '100.73.',  '100.74.',  '100.75.',
        '100.76.',  '100.77.',  '100.78.',  '100.79.',  '100.80.',  '100.81.',
        '100.82.',  '100.83.',  '100.84.',  '100.85.',  '100.86.',  '100.87.',
        '100.88.',  '100.89.',  '100.90.',  '100.91.',  '100.92.',  '100.93.',
        '100.94.',  '100.95.',  '100.96.',  '100.97.',  '100.98.',  '100.99.',
        '100.100.', '100.101.', '100.102.', '100.103.', '100.104.', '100.105.',
        '100.106.', '100.107.', '100.108.', '100.109.', '100.110.', '100.111.',
        '100.112.', '100.113.', '100.114.', '100.115.', '100.116.', '100.117.',
        '100.118.', '100.119.', '100.120.', '100.121.', '100.122.', '100.123.',
        '100.124.', '100.125.', '100.126.', '100.127.',  # carrier-grade NAT
        '169.254.',  # link-local block
        '172.16.', '172.17.', '172.18.', '172.19.',
        '172.20.', '172.21.', '172.22.', '172.23.',
        '172.24.', '172.25.', '172.26.', '172.27.',
        '172.28.', '172.29.', '172.30.', '172.31.',  # class B private blocks
        '192.0.0.',  # reserved for IANA special purpose address registry
        '192.0.2.',  # reserved for documentation and example code
        '192.168.',  # class C private block
        '198.18.', '198.19.',  # reserved for inter-network communications between two separate subnets
        '198.51.100.',  # reserved for documentation and example code
        '203.0.113.',  # reserved for documentation and example code
        '224.', '225.', '226.', '227.', '228.', '229.', '230.', '231.', '232.',
        '233.', '234.', '235.', '236.', '237.', '238.', '239.',  # multicast
        '240.', '241.', '242.', '243.', '244.', '245.', '246.', '247.', '248.',
        '249.', '250.', '251.', '252.', '253.', '254.', '255.',  # reserved
    ) + (
        '::',  # Unspecified address
        '::ffff:', '2001:10:', '2001:20:'  # messages to software
        '2001::',  # TEREDO
        '2001:2::',  # benchmarking
        '2001:db8:',  # reserved for documentation and example code
        'fc00:',  # IPv6 private block
        'fe80:',  # link-local unicast
        'ff00:',  # IPv6 multicast
    )
)

IPWARE_LOOPBACK_PREFIX = (
    '127.',  # IPv4 loopback device (Host)
    '::1',  # IPv6 loopback device (Host)
)

IPWARE_NON_PUBLIC_IP_PREFIX = IPWARE_PRIVATE_IP_PREFIX + IPWARE_LOOPBACK_PREFIX