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# -*- coding: utf-8 -*-
"""
certifi.py
~~~~~~~~~~
This module returns the installation location of cacert.pem or its contents.
"""
import os
class _PipPatchedCertificate(Exception):
pass
try:
# Return a certificate file on disk for a standalone pip zipapp running in
# an isolated build environment to use. Passing --cert to the standalone
# pip does not work since requests calls where() unconditionally on import.
_PIP_STANDALONE_CERT = os.environ.get("_PIP_STANDALONE_CERT")
if _PIP_STANDALONE_CERT:
def where():
return _PIP_STANDALONE_CERT
raise _PipPatchedCertificate()
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 _PipPatchedCertificate:
pass
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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