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- # -*- coding: utf-8 -*-
- """
- certifi.py
- ~~~~~~~~~~
- This module returns the installation location of cacert.pem or its contents.
- """
- import os
- try:
- from importlib.resources import path as get_path, read_text
- _CACERT_CTX = None
- _CACERT_PATH = None
- def where():
- # This is slightly terrible, but we want to delay extracting the file
- # in cases where we're inside of a zipimport situation until someone
- # actually calls where(), but we don't want to re-extract the file
- # on every call of where(), so we'll do it once then store it in a
- # global variable.
- global _CACERT_CTX
- global _CACERT_PATH
- if _CACERT_PATH is None:
- # This is slightly janky, the importlib.resources API wants you to
- # manage the cleanup of this file, so it doesn't actually return a
- # path, it returns a context manager that will give you the path
- # when you enter it and will do any cleanup when you leave it. In
- # the common case of not needing a temporary file, it will just
- # return the file system location and the __exit__() is a no-op.
- #
- # We also have to hold onto the actual context manager, because
- # it will do the cleanup whenever it gets garbage collected, so
- # we will also store that at the global level as well.
- _CACERT_CTX = get_path("pip._vendor.certifi", "cacert.pem")
- _CACERT_PATH = str(_CACERT_CTX.__enter__())
- return _CACERT_PATH
- except ImportError:
- # This fallback will work for Python versions prior to 3.7 that lack the
- # importlib.resources module but relies on the existing `where` function
- # so won't address issues with environments like PyOxidizer that don't set
- # __file__ on modules.
- def read_text(_module, _path, encoding="ascii"):
- with open(where(), "r", encoding=encoding) as data:
- return data.read()
- # If we don't have importlib.resources, then we will just do the old logic
- # of assuming we're on the filesystem and munge the path directly.
- def where():
- f = os.path.dirname(__file__)
- return os.path.join(f, "cacert.pem")
- def contents():
- return read_text("certifi", "cacert.pem", encoding="ascii")
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