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import datetime
import hashlib
import random
import re
import time
try:
random = random.SystemRandom()
using_sysrandom = True
except NotImplementedError:
import warnings
warnings.warn('A secure pseudo-random number generator is not available '
'on your system. Falling back to Mersenne Twister.')
using_sysrandom = False
def get_rand_string(length=12, allowed_chars='0123456789abcdef'):
"""
Returns a securely generated random string. Taken from the Django project
The default length of 12 with the a-z, A-Z, 0-9 character set returns
a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
"""
if not using_sysrandom:
# This is ugly, and a hack, but it makes things better than
# the alternative of predictability. This re-seeds the PRNG
# using a value that is hard for an attacker to predict, every
# time a random string is required. This may change the
# properties of the chosen random sequence slightly, but this
# is better than absolute predictability.
random.seed(
hashlib.sha256(
("%s%s" % (
random.getstate(),
time.time())).encode('utf-8')
).digest())
return ''.join([random.choice(allowed_chars) for i in range(length)])
def make_msg_id():
"""
Create a semi random message id, by using 12 char random hex string and
a timestamp.
@return: string consisting of timestamp, -, random value
"""
random_string = get_rand_string(12)
timestamp = datetime.datetime.now().strftime("%Y%m%d%I%M%S")
msg_id = timestamp + "-" + random_string
return msg_id
def make_id(name):
"""
Create a random id combined with the creditor name.
@return string consisting of name (truncated at 22 chars), -,
12 char rand hex string.
"""
name = re.sub(r'[^a-zA-Z0-9]', '', name)
r = get_rand_string(12)
if len(name) > 22:
name = name[:22]
return name + "-" + r
def int_to_decimal_str(integer):
"""
Helper to convert integers (representing cents) into decimal currency
string. WARNING: DO NOT TRY TO DO THIS BY DIVISION, FLOATING POINT
ERRORS ARE NO FUN IN FINANCIAL SYSTEMS.
@param integer The amount in cents
@return string The amount in currency with full stop decimal separator
"""
int_string = str(integer)
if len(int_string) <= 2:
return "0." + int_string.zfill(2)
else:
return int_string[:-2] + "." + int_string[-2:]
def decimal_str_to_int(decimal_string):
"""
Helper to decimal currency string into integers (cents).
WARNING: DO NOT TRY TO DO THIS BY CONVERSION AND MULTIPLICATION,
FLOATING POINT ERRORS ARE NO FUN IN FINANCIAL SYSTEMS.
@param string The amount in currency with full stop decimal separator
@return integer The amount in cents
"""
int_string = decimal_string.replace('.', '')
int_string = int_string.lstrip('0')
return int(int_string)
ADDRESS_MAPPING = (
("address_type", "AdrTp"),
("department", "Dept"),
("subdepartment", "SubDept"),
("street_name", "StrtNm"),
("building_number", "BldgNb"),
("postcode", "PstCd"),
("town", "TwnNm"),
("country_subdivision", "CtrySubDvsn"),
("country", "Ctry"),
)
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