9a82e533ef
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1888 fd906abe-77d9-0310-91a1-e0d9ade77398
57 lines
1.6 KiB
Python
57 lines
1.6 KiB
Python
#
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# Copyright (c) 2007 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Generate strange (not guessable) UIDs.
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$Id$
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"""
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import random
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bits = 128
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def generateName(check=None, lowerCaseOnly=False, bits=bits, seed=None, base=62):
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""" Generates an unguessable random name.
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"""
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if base > 64:
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raise ValueError('The base argument may not exceed 64, but is %i.' % base)
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random.seed(seed)
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OK = False
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base = lowerCaseOnly and min(base, 36) or base
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while not OK:
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data = strBase(random.getrandbits(bits), base)
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OK = check is None or check(data)
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return data
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def strBase(n, base):
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result = []
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while n > 0:
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n, r = divmod(n, base)
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result.append(r)
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return ''.join(reversed([toChar(n) for n in (result or [0])]))
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def toChar(n):
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return (n < 10 and chr(48+n)
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or n < 36 and chr(87+n)
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or n < 62 and chr(29+n)
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or ('-', '_')[n-62])
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