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40 lines
1.5 KiB
Python
40 lines
1.5 KiB
Python
from itertools import zip_longest
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import requests
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from urllib3.util.ssl_ import create_urllib3_context
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def calc_check_digits(number: str) -> str:
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"""Calculate the extra digits that should be appended to the number to make it a valid number.
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Source: python-stdnum iso7064.mod_97_10.calc_check_digits
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"""
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number_base10 = ''.join(str(int(x, 36)) for x in number)
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checksum = int(number_base10) % 97
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return '%02d' % ((98 - 100 * checksum) % 97)
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def format_rf_reference(number: str) -> str:
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"""Format a string into a Structured Creditor Reference.
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The Creditor Reference is an international standard (ISO 11649).
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Example: `123456789` -> `RF18 1234 5678 9`
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"""
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check_digits = calc_check_digits('{}RF'.format(number))
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return 'RF{} {}'.format(
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check_digits,
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" ".join("".join(x) for x in zip_longest(*[iter(str(number))]*4, fillvalue=""))
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)
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class LegacyHTTPAdapter(requests.adapters.HTTPAdapter):
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""" An adapter to allow unsafe legacy renegotiation necessary to connect to
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gravely outdated ETA production servers.
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"""
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def init_poolmanager(self, *args, **kwargs):
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# This is not defined before Python 3.12
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# cfr. https://github.com/python/cpython/pull/93927
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# Origin: https://github.com/openssl/openssl/commit/ef51b4b9
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OP_LEGACY_SERVER_CONNECT = 0x04
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context = create_urllib3_context(options=OP_LEGACY_SERVER_CONNECT)
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kwargs["ssl_context"] = context
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return super().init_poolmanager(*args, **kwargs)
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