source: mauRepo/dj_security/trunk/dj_security/middleware.py @ 8711

Subversion URL: http://proj.badc.rl.ac.uk/svn/ndg/mauRepo/dj_security/trunk/dj_security/middleware.py@8711
Revision 8711, 5.2 KB checked in by mnagni, 6 years ago (diff)

Small refactoring

  • Property svn:mime-type set to text/plain
Line 
1'''
2BSD Licence
3Copyright (c) 2012, Science & Technology Facilities Council (STFC)
4All rights reserved.
5
6Redistribution and use in source and binary forms, with or without modification,
7are permitted provided that the following conditions are met:
8
9    * Redistributions of source code must retain the above copyright notice,
10        this list of conditions and the following disclaimer.
11    * Redistributions in binary form must reproduce the above copyright notice,
12        this list of conditions and the following disclaimer in the documentation
13        and/or other materials provided with the distribution.
14    * Neither the name of the Science & Technology Facilities Council (STFC)
15        nor the names of its contributors may be used to endorse or promote
16        products derived from this software without specific prior written permission.
17
18THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
23OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29Created on 2 Nov 2012
30
31@author: mnagni
32'''
33from paste.auth.auth_tkt import AuthTicket
34from django.conf import settings
35from django.db.utils import DatabaseError
36from dj_security.exception import DSJOpenIDNotFoundError
37from django.shortcuts import render_to_response
38
39from userdb_model.models import User
40
41import socket
42import urlparse
43import base64
44import logging
45
46# Get an instance of a logger
47LOGGER = logging.getLogger(__name__)
48
49class DJS_Middleware(object):
50    """
51        Validates if the actual user is authenticated agains a
52        given authentication service.
53        Actually the middleware intercepts all the requests submitted
54        to the underlying Django application and verifies if the presence
55        or not of a valid paste cookie in the request.
56    """           
57   
58    def process_request(self, request):
59        pass
60   
61    def process_response(self, request, response):
62        LOGGER.debug("responding to request.path: %s" % (request.path))
63        session = getattr(request, 'session', None)
64       
65        if not session:       
66            return response
67       
68        if request.GET.get('r') and getattr(request, 'session', None):
69            request.session['r'] = request.GET.get('r')
70
71        if '/complete/' not in request.path:
72            request.session['done'] = False
73            return response
74
75        if request.path == '/account/signin/complete/' \
76                and not request.session.get('done', False):
77            return _encode_authenticated_response(request, response)
78
79        #if request.path == '/account/signin/complete/' \
80        # and request.session.get('done', False):
81        #    return response
82       
83        return response
84       
85   
86def _calculate_remote_ip(url_path):   
87    remote_url = urlparse.urlparse(url_path)
88    LOGGER.debug("calculating remote_ip for %s" % (str(remote_url)))
89    port = 80
90    host = None
91    if remote_url.netloc:
92        host = remote_url.netloc
93    elif remote_url.path:
94        host = remote_url.path
95       
96    if not host:
97        return None
98   
99    if ':' in host:
100        host, port = host.split(':')
101    addrinfo = socket.getaddrinfo(host, int(port))
102    LOGGER.info("%s has remote_ip %s" % (url_path, addrinfo[0][-1][0]))                                 
103    return addrinfo[0][-1][0]
104
105def get_user_byopenid(openid):
106    """
107        Returns a tbusers row specified by `openid`
108    - String **userkey**
109        a user
110    """
111    try:
112        return User.objects.get(openid=openid)
113    except DatabaseError as ex:
114        logging.error("Openid: %s - Not Found" % openid)
115        raise DSJOpenIDNotFoundError(ex) 
116
117def _encode_authenticated_response(request, response, context = {}):
118    remote_ip = calculate_remote_ip(base64.b64decode(request.session.get('r')))
119    LOGGER.info("responding to remote_ip: %s" % (remote_ip))
120    username = request.session.get('openid').openid
121    user = get_user_byopenid(username)
122   
123    token = AuthTicket(
124                getattr(settings, 'SHARED_SECRET', 'sharedsecret'),
125                username,
126                remote_ip,
127                user_data = '{"userkey": "%s"}' % (user.userkey))               
128    LOGGER.info("Created authTicket for %s from %s" % (username, remote_ip))
129    response.set_cookie('auth_tkt',
130                        token.cookie_value(),
131                        domain = getattr(settings, 'COOKIE_DOMAIN', None))
132    LOGGER.debug("Set authTicket in response for %s from %s"
133                 % (username, remote_ip))
134    redirect_parameter = getattr(settings, 'REDIRECT_URL', 'r')
135    context['redirect_url'] = \
136        base64.b64decode(request.session.get(redirect_parameter, ''))
137    return render_to_response('logged_in.html', context)
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