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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)
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