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# Copyright 2012, 2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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try:
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    from django.core.servers.basehttp import is_hop_by_hop
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except ImportError:
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    # Removed in Django 1.4
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    _hop_headers = {
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        'connection': 1, 'keep-alive': 1, 'proxy-authenticate': 1,
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        'proxy-authorization': 1, 'te': 1, 'trailers': 1,
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        'transfer-encoding': 1, 'upgrade': 1
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    }
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    def is_hop_by_hop(header_name):
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        """Return true if 'header_name' is an HTTP/1.1 "Hop-by-Hop" header"""
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        return header_name.lower() in _hop_headers
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def fix_header(k, v):
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    prefix = 'HTTP_'
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    if k.startswith(prefix):
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        k = k[len(prefix):].title().replace('_', '-')
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    return k, v
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def forward_header(k):
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    return k.upper() not in ['HOST', 'CONTENT_LENGTH', 'CONTENT_TYPE'] and \
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        not is_hop_by_hop(k) and not '.' in k