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9ffac2bef1
`distutils` is pretty much deprecated these days, and replaced with `setuptools`. It's also annoying because it's you can't `pip install` it, and it's hard to figure out which debian package we should depend on to make sure it's there. Since we only use it for a tiny function anyway, let's just vendor said function into our codebase.
97 lines
3.2 KiB
Python
97 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import itertools
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import random
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import re
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import string
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from collections.abc import Iterable
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from synapse.api.errors import Codes, SynapseError
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_string_with_symbols = string.digits + string.ascii_letters + ".,;:^&*-_+=#~@"
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# https://matrix.org/docs/spec/client_server/r0.6.0#post-matrix-client-r0-register-email-requesttoken
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client_secret_regex = re.compile(r"^[0-9a-zA-Z\.\=\_\-]+$")
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# random_string and random_string_with_symbols are used for a range of things,
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# some cryptographically important, some less so. We use SystemRandom to make sure
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# we get cryptographically-secure randoms.
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rand = random.SystemRandom()
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def random_string(length):
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return "".join(rand.choice(string.ascii_letters) for _ in range(length))
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def random_string_with_symbols(length):
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return "".join(rand.choice(_string_with_symbols) for _ in range(length))
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def is_ascii(s):
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if isinstance(s, bytes):
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try:
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s.decode("ascii").encode("ascii")
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except UnicodeDecodeError:
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return False
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except UnicodeEncodeError:
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return False
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return True
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def assert_valid_client_secret(client_secret):
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"""Validate that a given string matches the client_secret regex defined by the spec"""
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if client_secret_regex.match(client_secret) is None:
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raise SynapseError(
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400, "Invalid client_secret parameter", errcode=Codes.INVALID_PARAM
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)
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def shortstr(iterable: Iterable, maxitems: int = 5) -> str:
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"""If iterable has maxitems or fewer, return the stringification of a list
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containing those items.
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Otherwise, return the stringification of a a list with the first maxitems items,
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followed by "...".
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Args:
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iterable: iterable to truncate
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maxitems: number of items to return before truncating
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"""
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items = list(itertools.islice(iterable, maxitems + 1))
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if len(items) <= maxitems:
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return str(items)
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return "[" + ", ".join(repr(r) for r in items[:maxitems]) + ", ...]"
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def strtobool(val: str) -> bool:
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"""Convert a string representation of truth to True or False
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True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
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are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
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'val' is anything else.
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This is lifted from distutils.util.strtobool, with the exception that it actually
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returns a bool, rather than an int.
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"""
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val = val.lower()
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if val in ("y", "yes", "t", "true", "on", "1"):
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return True
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elif val in ("n", "no", "f", "false", "off", "0"):
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return False
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else:
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raise ValueError("invalid truth value %r" % (val,))
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