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86 lines
2.4 KiB
86 lines
2.4 KiB
# -*- encoding: utf-8 -*-
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from __future__ import division
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import random
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import hashlib
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from string import ascii_letters, digits
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import ipaddress
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def anonymize(remote_addr):
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"""
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Anonymize IPv4 and IPv6 :param remote_addr: to /24 (zero'd)
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and /48 (zero'd).
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>>> anonymize(u'12.34.56.78') # doctest: +IGNORE_UNICODE
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'12.34.56.0'
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>>> anonymize(u'1234:5678:90ab:cdef:fedc:ba09:8765:4321') # doctest: +IGNORE_UNICODE
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'1234:5678:90ab:0000:0000:0000:0000:0000'
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"""
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try:
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ipv4 = ipaddress.IPv4Address(remote_addr)
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return u''.join(ipv4.exploded.rsplit('.', 1)[0]) + '.' + '0'
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except ipaddress.AddressValueError:
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ipv6 = ipaddress.IPv6Address(remote_addr)
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if ipv6.ipv4_mapped is not None:
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return anonymize(ipv6.ipv4_mapped)
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return u'' + ipv6.exploded.rsplit(':', 5)[0] + ':' + ':'.join(['0000']*5)
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def salt(value, s=u'\x082@t9*\x17\xad\xc1\x1c\xa5\x98'):
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return hashlib.sha1((value + s).encode('utf-8')).hexdigest()
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def mksecret(length):
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return ''.join(random.choice(ascii_letters + digits) for x in range(length))
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class Bloomfilter:
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"""A space-efficient probabilistic data structure. False-positive rate:
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* 1e-05 for <80 elements
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* 1e-04 for <105 elements
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* 1e-03 for <142 elements
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Uses a 256 byte array (2048 bits) and 11 hash functions. 256 byte because
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of space efficiency (array is saved for each comment) and 11 hash functions
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because of best overall false-positive rate in that range.
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-- via Raymond Hettinger
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http://code.activestate.com/recipes/577684-bloom-filter/
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"""
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def __init__(self, array=bytearray(256), elements=0, iterable=()):
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self.array = array
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self.elements = elements
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self.k = 11
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self.m = len(array) * 8
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for item in iterable:
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self.add(item)
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def get_probes(self, key):
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h = int(hashlib.sha256(key.encode()).hexdigest(), 16)
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for _ in range(self.k):
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yield h & self.m - 1
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h >>= self.k
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def add(self, key):
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for i in self.get_probes(key):
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self.array[i//8] |= 2 ** (i%8)
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self.elements += 1
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@property
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def density(self):
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c = ''.join(format(x, '08b') for x in self.array)
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return c.count('1') / len(c)
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def __contains__(self, key):
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return all(self.array[i//8] & (2 ** (i%8)) for i in self.get_probes(key))
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def __len__(self):
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return self.elements
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