cas_provider/views.py

   1 import logging
   2 logger = logging.getLogger('cas_provider.views')
   3 import urllib
   4
   5 from django.http import HttpResponse, HttpResponseRedirect
   6 from django.shortcuts import render_to_response
   7 from django.template import RequestContext
   8 from django.contrib.auth import authenticate
   9 from django.contrib.auth import login as auth_login, logout as auth_logout
  10 from django.core.urlresolvers import reverse
  11
  12 from forms import LoginForm, MergeLoginForm
  13 from models import ServiceTicket
  14 from utils import create_service_ticket
  15 from exceptions import SameEmailMismatchedPasswords
  16
  17 from . import signals
  18
  19 __all__ = ['login', 'validate', 'logout']
  20
  21
  22 def _build_service_url(service, ticket):
  23     if service.find('?') == -1:
  24         return service + '?ticket=' + ticket.ticket
  25     else:
  26         return service + '&ticket=' + ticket.ticket
  27
  28
  29 def login(request, template_name='cas/login.html', success_redirect='/account/', merge=False):
  30     logging.debug('CAS Provider Login view. Method is %s, merge is %s, template is %s.',
  31                   request.method, merge, template_name)
  32
  33     service = request.GET.get('service', None)
  34     if service is not None:
  35         # Save the service on the session, for later use if we end up
  36         # in one of the more complicated workflows.
  37         request.session['service'] = service
  38
  39     user = request.user
  40
  41     errors = []
  42
  43     if request.method == 'POST':
  44         if merge:
  45             form = MergeLoginForm(request.POST, request=request)
  46         else:
  47             form = LoginForm(request.POST, request=request)
  48
  49         if form.is_valid():
  50             service = form.cleaned_data.get('service', None)
  51             try:
  52                 auth_args = dict(username=form.cleaned_data['email'],
  53                                  password=form.cleaned_data['password'])
  54                 if merge:
  55                     # We only want to send the merge argument if it's
  56                     # True. If it it's False, we want it to propagate
  57                     # through the auth backends properly.
  58                     auth_args['merge'] = merge
  59                 user = authenticate(**auth_args)
  60             except SameEmailMismatchedPasswords:
  61                 # Need to merge the accounts?
  62                 if merge:
  63                     # We shouldn't get here...
  64                     raise
  65                 else:
  66                     base_url = reverse('cas_provider_merge')
  67                     args = dict(
  68                         success_redirect=success_redirect,
  69                         email=form.cleaned_data['email'],
  70                         )
  71                     if service is not None:
  72                         args['service'] = service
  73                     args = urllib.urlencode(args)
  74
  75                     url = '%s?%s' % (base_url, args)
  76                     logging.debug('Redirecting to %s', url)
  77                     return HttpResponseRedirect(url)
  78
  79             if user is None:
  80                 errors.append('Incorrect username and/or password.')
  81             else:
  82                 if user.is_active:
  83                     auth_login(request, user)
  84
  85     else:  # Not a POST...
  86         if merge:
  87             form = MergeLoginForm(initial={'service': service, 'email': request.GET.get('email')})
  88         else:
  89             form = LoginForm(initial={'service': service})
  90
  91     if user is not None and user.is_authenticated():
  92         # We have an authenticated user.
  93         if not user.is_active:
  94             errors.append('This account is disabled.')
  95         else:
  96             if service is None:
  97                 # Normal internal success redirection.
  98                 logging.debug('Redirecting to %s', success_redirect)
  99                 return HttpResponseRedirect(success_redirect)
 100             else:
 101                 # Create a service ticket and redirect to the service.
 102                 ticket = create_service_ticket(request.user, service)
 103                 if 'service' in request.session:
 104                     # Don't need this any more.
 105                     del request.session['service']
 106
 107                 url = _build_service_url(service, ticket.ticket)
 108                 logging.debug('Redirecting to %s', url)
 109                 return HttpResponseRedirect(url)
 110
 111     logging.debug('Rendering response on %s, merge is %s', template_name, merge)
 112     return render_to_response(template_name, {'form': form, 'errors': errors}, context_instance=RequestContext(request))
 113
 114
 115 def socialauth_login(request, template_name='cas/login.html', success_redirect='/account/'):
 116     """ Similiar to login but user has been authenticated already through social auth.
 117         This step authenticates the login and generates a service ticket.
 118     """
 119     user = request.user
 120     user.backend = 'django.contrib.auth.backends.ModelBackend'
 121     if 'service' in request.session:
 122         service = request.session['service']
 123         del request.session['service']
 124     else:
 125         service = '/'
 126     errors = []
 127     if user is not None:
 128         if user.is_active:
 129             auth_login(request, user)
 130             if service is not None:
 131                 ticket = create_service_ticket(user, service)
 132                 return HttpResponseRedirect(_build_service_url(service, ticket.ticket))
 133             else:
 134                 return HttpResponseRedirect(success_redirect)
 135         else:
 136             errors.append('This account is disabled.')
 137     else:
 138         errors.append('Incorrect username and/or password.')
 139     return render_to_response(template_name, {'errors': errors}, context_instance=RequestContext(request))
 140
 141
 142 def validate(request):
 143     service = request.GET.get('service', None)
 144     ticket_string = request.GET.get('ticket', None)
 145     logger.info('Validating ticket %s for %s', ticket_string, service)
 146     if service is not None and ticket_string is not None:
 147         try:
 148             ticket = ServiceTicket.objects.get(ticket=ticket_string)
 149         except ServiceTicket.DoesNotExist:
 150             logger.exception("Tried to validate with an invalid ticket %s for %s", ticket_string, service)
 151         except Exception as e:
 152             logger.exception('Got an exception: %s', e)
 153         else:
 154             username = ticket.user.username
 155             ticket.delete()
 156
 157             results = signals.on_cas_collect_histories.send(sender=validate, for_email=ticket.user.email)
 158             histories = '\n'.join('\n'.join(rs) for rc, rs in results)
 159             logger.info('Validated %s %s', username, "(also %s)" % histories if histories else '')
 160             return HttpResponse("yes\n%s\n%s" % (username, histories))
 161
 162     logger.info('Validation failed.')
 163     return HttpResponse("no\n\n")
 164
 165
 166 def logout(request, template_name='cas/logout.html'):
 167     url = request.GET.get('url', None)
 168     auth_logout(request)
 169     return render_to_response(template_name, {'url': url}, context_instance=RequestContext(request))