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# pylint: disable=unused-import
"""Compatibility code for using Cheroot with various versions of Python."""
import os
import platform
try:
import ssl
IS_ABOVE_OPENSSL10 = ssl.OPENSSL_VERSION_INFO >= (1, 1)
del ssl
except ImportError:
IS_ABOVE_OPENSSL10 = None
IS_CI = bool(os.getenv('CI'))
IS_GITHUB_ACTIONS_WORKFLOW = bool(os.getenv('GITHUB_WORKFLOW'))
IS_PYPY = platform.python_implementation() == 'PyPy'
SYS_PLATFORM = platform.system()
IS_WINDOWS = SYS_PLATFORM == 'Windows'
IS_LINUX = SYS_PLATFORM == 'Linux'
IS_MACOS = SYS_PLATFORM == 'Darwin'
IS_SOLARIS = SYS_PLATFORM == 'SunOS'
PLATFORM_ARCH = platform.machine()
IS_PPC = PLATFORM_ARCH.startswith('ppc')
def ntob(n, encoding='ISO-8859-1'):
"""Return the native string as bytes in the given encoding."""
assert_native(n)
# In Python 3, the native string type is unicode
return n.encode(encoding)
def ntou(n, encoding='ISO-8859-1'):
"""Return the native string as Unicode with the given encoding."""
assert_native(n)
# In Python 3, the native string type is unicode
return n
def bton(b, encoding='ISO-8859-1'):
"""Return the byte string as native string in the given encoding."""
return b.decode(encoding)
def assert_native(n):
"""Check whether the input is of native :py:class:`str` type.
Raises:
TypeError: in case of failed check
"""
if not isinstance(n, str):
raise TypeError('n must be a native str (got %s)' % type(n).__name__)
def extract_bytes(mv):
r"""Retrieve bytes out of the given input buffer.
:param mv: input :py:func:`buffer`
:type mv: memoryview or bytes
:return: unwrapped bytes
:rtype: bytes
:raises ValueError: if the input is not one of \
:py:class:`memoryview`/:py:func:`buffer` \
or :py:class:`bytes`
"""
if isinstance(mv, memoryview):
return mv.tobytes()
if isinstance(mv, bytes):
return mv
raise ValueError(
'extract_bytes() only accepts bytes and memoryview/buffer',
)
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