"""A helper module that injects SecureTransport, on import.
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The import should be done as early as possible, to ensure all requests and
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sessions (or whatever) are created after injecting SecureTransport.
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Note that we only do the injection on macOS, when the linked OpenSSL is too
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old to handle TLSv1.2.
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"""
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import sys
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def inject_securetransport():
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# type: () -> None
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# Only relevant on macOS
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if sys.platform != "darwin":
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return
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try:
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import ssl
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except ImportError:
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return
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# Checks for OpenSSL 1.0.1
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if ssl.OPENSSL_VERSION_NUMBER >= 0x1000100f:
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return
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try:
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from pip._vendor.urllib3.contrib import securetransport
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except (ImportError, OSError):
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return
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securetransport.inject_into_urllib3()
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inject_securetransport()
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