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# Copyright 2011-2012 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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from time import time, mktime
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from urlparse import urlparse
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from httplib import HTTPConnection, HTTPSConnection
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from urllib import quote, unquote
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from django.conf import settings
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from django.utils import simplejson as json
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def authenticate(token, authentication_url='http://127.0.0.1:8000/im/authenticate'):
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    p = urlparse(authentication_url)
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    if p.scheme == 'http':
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        conn = HTTPConnection(p.netloc)
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    elif p.scheme == 'https':
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        conn = HTTPSConnection(p.netloc)
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    else:
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        raise Exception('Unknown URL scheme')
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    kwargs = {}
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    kwargs['headers'] = {}
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    kwargs['headers']['X-Auth-Token'] = token
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    kwargs['headers']['Content-Length'] = 0
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    conn.request('GET', p.path, **kwargs)
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    response = conn.getresponse()
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    headers = response.getheaders()
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    headers = dict((unquote(h), unquote(v)) for h,v in headers)
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    length = response.getheader('content-length', None)
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    data = response.read(length)
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    status = int(response.status)
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    if status < 200 or status >= 300:
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        raise Exception(data, int(response.status))
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    return json.loads(data)
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def user_for_token(token, authentication_url, override_users):
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    if not token:
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        return None
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    if override_users:
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        try:
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            return {'uniq': override_users[token].decode('utf8')}
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        except:
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            return None
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    try:
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        return authenticate(token, authentication_url)
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    except:
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        return None
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def get_user(request, authentication_url='http://127.0.0.1:8000/im/authenticate', override_users={}, fallback_token=None):
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    request.user = None
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    request.user_uniq = None
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    # Try to find token in a parameter or in a request header.
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    user = user_for_token(request.GET.get('X-Auth-Token'), authentication_url, override_users)
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    if not user:
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        user = user_for_token(request.META.get('HTTP_X_AUTH_TOKEN'), authentication_url, override_users)
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    if not user:
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        user = user_for_token(fallback_token, authentication_url, override_users)
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    if not user:
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        return
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    request.user = user
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    request.user_uniq = user['uniq']