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