voice-gateway/alibabacloud-nls-python-sdk-1.0.2/nls/websocket/_ssl_compat.py

"""
_ssl_compat.py
websocket - WebSocket client library for Python

Copyright 2021 engn33r

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
__all__ = ["HAVE_SSL", "ssl", "SSLError", "SSLWantReadError", "SSLWantWriteError"]

try:
    import ssl
    from ssl import SSLError
    from ssl import SSLWantReadError
    from ssl import SSLWantWriteError
    HAVE_CONTEXT_CHECK_HOSTNAME = False
    if hasattr(ssl, 'SSLContext') and hasattr(ssl.SSLContext, 'check_hostname'):
        HAVE_CONTEXT_CHECK_HOSTNAME = True

    __all__.append("HAVE_CONTEXT_CHECK_HOSTNAME")
    HAVE_SSL = True
except ImportError:
    # dummy class of SSLError for environment without ssl support
    class SSLError(Exception):
        pass

    class SSLWantReadError(Exception):
        pass

    class SSLWantWriteError(Exception):
        pass

    ssl = None
    HAVE_SSL = False