author | Todd Larsen <tlarsen@google.com> |
Fri, 29 Aug 2008 02:52:02 +0000 | |
changeset 122 | 95d0d954fe0b |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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import base64 |
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import md5 |
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import cPickle as pickle |
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try: |
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from functools import wraps |
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except ImportError: |
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from django.utils.functional import wraps # Python 2.3, 2.4 fallback. |
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|
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from django import http, template |
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from django.conf import settings |
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from django.contrib.auth.models import User |
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from django.contrib.auth import authenticate, login |
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from django.shortcuts import render_to_response |
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from django.utils.translation import ugettext_lazy, ugettext as _ |
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from django.utils.safestring import mark_safe |
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ERROR_MESSAGE = ugettext_lazy("Please enter a correct username and password. Note that both fields are case-sensitive.") |
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LOGIN_FORM_KEY = 'this_is_the_login_form' |
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|
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def _display_login_form(request, error_message=''): |
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request.session.set_test_cookie() |
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if request.POST and 'post_data' in request.POST: |
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# User has failed login BUT has previously saved post data. |
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post_data = request.POST['post_data'] |
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elif request.POST: |
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# User's session must have expired; save their post data. |
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post_data = _encode_post_data(request.POST) |
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else: |
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post_data = _encode_post_data({}) |
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return render_to_response('admin/login.html', { |
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'title': _('Log in'), |
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'app_path': request.path, |
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'post_data': post_data, |
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'error_message': error_message |
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}, context_instance=template.RequestContext(request)) |
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def _encode_post_data(post_data): |
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pickled = pickle.dumps(post_data) |
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pickled_md5 = md5.new(pickled + settings.SECRET_KEY).hexdigest() |
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return base64.encodestring(pickled + pickled_md5) |
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|
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def _decode_post_data(encoded_data): |
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encoded_data = base64.decodestring(encoded_data) |
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pickled, tamper_check = encoded_data[:-32], encoded_data[-32:] |
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if md5.new(pickled + settings.SECRET_KEY).hexdigest() != tamper_check: |
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from django.core.exceptions import SuspiciousOperation |
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raise SuspiciousOperation, "User may have tampered with session cookie." |
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return pickle.loads(pickled) |
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def staff_member_required(view_func): |
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""" |
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Decorator for views that checks that the user is logged in and is a staff |
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member, displaying the login page if necessary. |
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""" |
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def _checklogin(request, *args, **kwargs): |
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if request.user.is_authenticated() and request.user.is_staff: |
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# The user is valid. Continue to the admin page. |
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if 'post_data' in request.POST: |
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# User must have re-authenticated through a different window |
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# or tab. |
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request.POST = _decode_post_data(request.POST['post_data']) |
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return view_func(request, *args, **kwargs) |
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|
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assert hasattr(request, 'session'), "The Django admin requires session middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.sessions.middleware.SessionMiddleware'." |
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|
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# If this isn't already the login page, display it. |
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if LOGIN_FORM_KEY not in request.POST: |
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if request.POST: |
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message = _("Please log in again, because your session has expired. Don't worry: Your submission has been saved.") |
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else: |
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message = "" |
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return _display_login_form(request, message) |
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|
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# Check that the user accepts cookies. |
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if not request.session.test_cookie_worked(): |
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message = _("Looks like your browser isn't configured to accept cookies. Please enable cookies, reload this page, and try again.") |
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return _display_login_form(request, message) |
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|
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# Check the password. |
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username = request.POST.get('username', None) |
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password = request.POST.get('password', None) |
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user = authenticate(username=username, password=password) |
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if user is None: |
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message = ERROR_MESSAGE |
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if '@' in username: |
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# Mistakenly entered e-mail address instead of username? Look it up. |
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users = list(User.objects.filter(email=username)) |
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if len(users) == 1: |
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message = _("Your e-mail address is not your username. Try '%s' instead.") % users[0].username |
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else: |
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# Either we cannot find the user, or if more than 1 |
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# we cannot guess which user is the correct one. |
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message = _("Usernames cannot contain the '@' character.") |
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return _display_login_form(request, message) |
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|
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# The user data is correct; log in the user in and continue. |
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else: |
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if user.is_active and user.is_staff: |
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login(request, user) |
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# TODO: set last_login with an event. |
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if 'post_data' in request.POST: |
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post_data = _decode_post_data(request.POST['post_data']) |
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103 |
if post_data and LOGIN_FORM_KEY not in post_data: |
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# overwrite request.POST with the saved post_data, and continue |
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request.POST = post_data |
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request.user = user |
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return view_func(request, *args, **kwargs) |
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else: |
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request.session.delete_test_cookie() |
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110 |
return http.HttpResponseRedirect(request.path) |
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111 |
else: |
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Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
112 |
return _display_login_form(request, ERROR_MESSAGE) |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
113 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
114 |
return wraps(view_func)(_checklogin) |