cas_provider/views.py

   1 from django.conf import settings
   2 from django.contrib.auth import 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 forms import LoginForm
   8 from models import ServiceTicket, LoginTicket
   9
  10
  11 __all__ = ['login', 'validate', 'logout', 'service_validate']
  12
  13
  14 def login(request, template_name='cas/login.html', \
  15                 success_redirect=settings.LOGIN_REDIRECT_URL):
  16     service = request.GET.get('service', None)
  17     if request.user.is_authenticated():
  18         if service is not None:
  19             ticket = ServiceTicket.objects.create(service=service, user=request.user)
  20             return HttpResponseRedirect(ticket.get_redirect_url())
  21         else:
  22             return HttpResponseRedirect(success_redirect)
  23     if request.method == 'POST':
  24         form = LoginForm(request.POST)
  25         if form.is_valid():
  26             user = form.get_user()
  27             auth_login(request, user)
  28             service = form.cleaned_data.get('service')
  29             if service is not None:
  30                 ticket = ServiceTicket.objects.create(service=service, user=user)
  31                 success_redirect = ticket.get_redirect_url()
  32             return HttpResponseRedirect(success_redirect)
  33     else:
  34         form = LoginForm(initial={
  35             'service': service,
  36             'lt': LoginTicket.objects.create()
  37         })
  38     return render_to_response(template_name, {
  39         'form': form,
  40         'errors': form.get_errors()
  41     }, context_instance=RequestContext(request))
  42
  43
  44 def validate(request):
  45     """Validate ticket via CAS v.1 protocol"""
  46     service = request.GET.get('service', None)
  47     ticket_string = request.GET.get('ticket', None)
  48     if service is not None and ticket_string is not None:
  49         try:
  50             ticket = ServiceTicket.objects.get(ticket=ticket_string)
  51             username = ticket.user.username
  52             ticket.delete()
  53             return HttpResponse("yes\r\n%s\r\n" % username)
  54         except:
  55             pass
  56     return HttpResponse("no\r\n\r\n")
  57
  58
  59 def logout(request, template_name='cas/logout.html'):
  60     url = request.GET.get('url', None)
  61     auth_logout(request)
  62     return render_to_response(template_name, {'url': url}, context_instance=RequestContext(request))
  63
  64
  65 def service_validate(request):
  66     """Validate ticket via CAS v.2 protocol"""
  67     service = request.GET.get('service', None)
  68     ticket_string = request.GET.get('ticket', None)
  69     if service is None or ticket_string is None:
  70         return _cas2_error_response(u'INVALID_REQUEST', u'Not all required parameters were sent.')
  71
  72     try:
  73         ticket = ServiceTicket.objects.get(ticket=ticket_string)
  74     except ServiceTicket.DoesNotExist:
  75         return _cas2_error_response(u'INVALID_TICKET', u'The provided ticket is invalid.')
  76
  77     if settings.CAS_CHECK_SERVICE and ticket.service != service:
  78         ticket.delete()
  79         return _cas2_error_response('INVALID_SERVICE', u'Service is invalid')
  80
  81     username = ticket.user.username
  82     ticket.delete()
  83     return HttpResponse(u'''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
  84         <cas:authenticationSuccess>
  85             <cas:user>%(username)s</cas:user>
  86         </cas:authenticationSuccess>
  87     </cas:serviceResponse>''' % {'username': username}, mimetype='text/xml')
  88
  89
  90 def _cas2_error_response(code, message):
  91     return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
  92             <cas:authenticationFailure code="%s">
  93                 %s
  94             </cas:authenticationFailure>
  95         </cas:serviceResponse>''', mimetype='text/xml')