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# -*- test-case-name: twisted.test.test_sslverify -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Shared interface to IDNA encoding and decoding, using the C{idna} PyPI package if available, otherwise the stdlib implementation. """ def _idnaBytes(text: str) -> bytes: """ Convert some text typed by a human into some ASCII bytes. This is provided to allow us to use the U{partially-broken IDNA implementation in the standard library <http://bugs.python.org/issue17305>} if the more-correct U{idna <https://pypi.python.org/pypi/idna>} package is not available; C{service_identity} is somewhat stricter about this. @param text: A domain name, hopefully. @type text: L{unicode} @return: The domain name's IDNA representation, encoded as bytes. @rtype: L{bytes} """ try: import idna except ImportError: return text.encode("idna") else: return idna.encode(text) def _idnaText(octets: bytes) -> str: """ Convert some IDNA-encoded octets into some human-readable text. Currently only used by the tests. @param octets: Some bytes representing a hostname. @type octets: L{bytes} @return: A human-readable domain name. @rtype: L{unicode} """ try: import idna except ImportError: return octets.decode("idna") else: return idna.decode(octets)