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# Copyright (C) 2011-2014 by Barry A. Warsaw
#
# This file is part of flufl.password
#
# flufl.password is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, version 3 of the License.
#
# flufl.password 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 Lesser General Public
# License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with flufl.password. If not, see <http://www.gnu.org/licenses/>.
"""User-friendly password generation."""
from __future__ import absolute_import, print_function, unicode_literals
__metaclass__ = type
__all__ = [
'generate',
]
import random
from itertools import chain, product
from string import ascii_lowercase
EMPTYSTRING = ''
_vowels = tuple('aeiou')
_consonants = tuple(c for c in ascii_lowercase if c not in _vowels)
_syllables = tuple(x + y for (x, y) in
chain(product(_vowels, _consonants),
product(_consonants, _vowels)))
def generate(length=8):
"""Make a random *user friendly* password.
Such passwords are nominally easier to pronounce and thus remember. Their
security in relationship to purely random passwords has not been
determined.
:param length: Minimum length in characters for the resulting password.
The password will always be an even number of characters. The default
is to create passwords of length 8.
:type length: int
:return: The user friendly password.
:rtype: string
"""
syllables = []
while len(syllables) * 2 < length:
syllables.append(random.choice(_syllables))
return EMPTYSTRING.join(syllables)[:length]
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