cas_provider/views.py

   1 from django.conf import settings
   2 from django.contrib.auth import authenticate, login as auth_login, \
   3     logout as auth_logout
   4 from django.http import HttpResponse, HttpResponseRedirect
   5 from django.shortcuts import render_to_response
   6 from django.template import RequestContext
   7 from django.utils.translation import ugettext_lazy as _
   8 from forms import LoginForm
   9 from models import ServiceTicket, LoginTicket
  10 from utils import create_service_ticket
  11
  12
  13 __all__ = ['login', 'validate', 'logout', 'service_validate']
  14
  15
  16 def login(request, template_name='cas/login.html', success_redirect='/accounts/'):
  17     service = request.GET.get('service', None)
  18     if request.user.is_authenticated():
  19         if service is not None:
  20             ticket = create_service_ticket(request.user, service)
  21             if service.find('?') == -1:
  22                 return HttpResponseRedirect(service + '?ticket=' + ticket.ticket)
  23             else:
  24                 return HttpResponseRedirect(service + '&ticket=' + ticket.ticket)
  25         else:
  26             return HttpResponseRedirect(success_redirect)
  27     errors = []
  28     if request.method == 'POST':
  29         username = request.POST.get('username', None)
  30         password = request.POST.get('password', None)
  31         service = request.POST.get('service', None)
  32         lt = request.POST.get('lt', None)
  33
  34         try:
  35             login_ticket = LoginTicket.objects.get(ticket=lt)
  36         except:
  37             errors.append(_('Login ticket expired. Please try again.'))
  38         else:
  39             login_ticket.delete()
  40             user = authenticate(username=username, password=password)
  41             if user is not None:
  42                 if user.is_active:
  43                     auth_login(request, user)
  44                     if service is not None:
  45                         ticket = create_service_ticket(user, service)
  46                         return HttpResponseRedirect(service + '?ticket=' + ticket.ticket)
  47                     else:
  48                         return HttpResponseRedirect(success_redirect)
  49                 else:
  50                     errors.append(_('This account is disabled.'))
  51             else:
  52                     errors.append(_('Incorrect username and/or password.'))
  53     form = LoginForm(service)
  54     return render_to_response(template_name, {'form': form, 'errors': errors}, context_instance=RequestContext(request))
  55
  56
  57 def validate(request):
  58     """Validate ticket via CAS v.1 protocol"""
  59     service = request.GET.get('service', None)
  60     ticket_string = request.GET.get('ticket', None)
  61     if service is not None and ticket_string is not None:
  62         try:
  63             ticket = ServiceTicket.objects.get(ticket=ticket_string)
  64             username = ticket.user.username
  65             ticket.delete()
  66             return HttpResponse("yes\r\n%s\r\n" % username)
  67         except:
  68             pass
  69     return HttpResponse("no\r\n\r\n")
  70
  71
  72 def logout(request, template_name='cas/logout.html'):
  73     url = request.GET.get('url', None)
  74     auth_logout(request)
  75     return render_to_response(template_name, {'url': url}, context_instance=RequestContext(request))
  76
  77
  78 def service_validate(request):
  79     """Validate ticket via CAS v.2 protocol"""
  80     service = request.GET.get('service', None)
  81     ticket_string = request.GET.get('ticket', None)
  82     if service is None or ticket_string is None:
  83         return _cas2_error_response(u'INVALID_REQUEST', u'Not all required parameters were sent.')
  84
  85     try:
  86         ticket = ServiceTicket.objects.get(ticket=ticket_string)
  87     except ServiceTicket.DoesNotExist:
  88         return _cas2_error_response(u'INVALID_TICKET', u'The provided ticket is invalid.')
  89
  90     if settings.CAS_CHECK_SERVICE and ticket.service != service:
  91         ticket.delete()
  92         return _cas2_error_response('INVALID_SERVICE', u'Service is invalid')
  93
  94     username = ticket.user.username
  95     ticket.delete()
  96     return HttpResponse(u'''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
  97         <cas:authenticationSuccess>
  98             <cas:user>%(username)s</cas:user>
  99         </cas:authenticationSuccess>
 100     </cas:serviceResponse>''' % {'username': username}, mimetype='text/xml')
 101
 102
 103 def _cas2_error_response(code, message):
 104     return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
 105             <cas:authenticationFailure code="%s">
 106                 %s
 107             </cas:authenticationFailure>
 108         </cas:serviceResponse>''', mimetype='text/xml')