test_utils.py
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test_utils.py
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	# Copyright (C) 2020-2021 The Software Heritage developers
	# See the AUTHORS file at the top-level directory of this distribution
	# License: GNU Affero General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	from base64 import urlsafe_b64encode
	import hashlib
	import re

	from swh.auth.utils import gen_oidc_pkce_codes


	def test_gen_oidc_pkce_codes():
	"""
	Check generated PKCE codes respect the specification
	(see https://tools.ietf.org/html/rfc7636#section-4.1)
	"""
	code_verifier, code_challenge = gen_oidc_pkce_codes()

	# check the code verifier only contains allowed characters
	assert re.match(r"[a-zA-Z0-9-\._~]+", code_verifier)

	# check minimum and maximum authorized length for the
	# code verifier
	assert len(code_verifier) >= 43
	assert len(code_verifier) <= 128

	# compute code challenge from code verifier
	challenge = hashlib.sha256(code_verifier.encode("ascii")).digest()
	challenge = urlsafe_b64encode(challenge).decode("ascii")
	challenge = challenge.replace("=", "")

	# check base64 padding is not present
	assert not code_challenge[-1].endswith("=")
	# check code challenge is valid
	assert code_challenge == challenge