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 INVALID_TICKET = 1
  15 INVALID_SERVICE = 2
  16 INVALID_REQUEST = 3
  17
  18 ERROR_MESSAGES = (
  19     (INVALID_TICKET, u'The provided ticket is invalid.'),
  20     (INVALID_SERVICE, u'Service is invalid'),
  21     (INVALID_REQUEST, u'Not all required parameters were sent.'),
  22 )
  23
  24
  25 def login(request, template_name='cas/login.html', \
  26                 success_redirect=settings.LOGIN_REDIRECT_URL,
  27                 warn_template_name='cas/warn.html'):
  28     service = request.GET.get('service', None)
  29     if request.user.is_authenticated():
  30         if service is not None:
  31             if request.GET.get('warn', False):
  32                 return render_to_response(warn_template_name, {
  33                     'service': service,
  34                     'warn': False
  35                 }, context_instance=RequestContext(request))
  36             ticket = ServiceTicket.objects.create(service=service, user=request.user)
  37             return HttpResponseRedirect(ticket.get_redirect_url())
  38         else:
  39             return HttpResponseRedirect(success_redirect)
  40     if request.method == 'POST':
  41         form = LoginForm(request.POST)
  42         if form.is_valid():
  43             user = form.get_user()
  44             auth_login(request, user)
  45             service = form.cleaned_data.get('service')
  46             if service is not None:
  47                 ticket = ServiceTicket.objects.create(service=service, user=user)
  48                 success_redirect = ticket.get_redirect_url()
  49             return HttpResponseRedirect(success_redirect)
  50     else:
  51         form = LoginForm(initial={
  52             'service': service,
  53             'lt': LoginTicket.objects.create()
  54         })
  55     return render_to_response(template_name, {
  56         'form': form,
  57         'errors': form.get_errors()
  58     }, context_instance=RequestContext(request))
  59
  60
  61 def validate(request):
  62     """Validate ticket via CAS v.1 protocol"""
  63     service = request.GET.get('service', None)
  64     ticket_string = request.GET.get('ticket', None)
  65     if service is not None and ticket_string is not None:
  66         try:
  67             ticket = ServiceTicket.objects.get(ticket=ticket_string)
  68             username = ticket.user.username
  69             ticket.delete()
  70             return HttpResponse("yes\n%s\n" % username)
  71         except:
  72             pass
  73     return HttpResponse("no\n\n")
  74
  75
  76 def logout(request, template_name='cas/logout.html'):
  77     url = request.GET.get('url', None)
  78     auth_logout(request)
  79     return render_to_response(template_name, {'url': url}, \
  80                               context_instance=RequestContext(request))
  81
  82
  83 def service_validate(request):
  84     """Validate ticket via CAS v.2 protocol"""
  85     service = request.GET.get('service', None)
  86     ticket_string = request.GET.get('ticket', None)
  87     if service is None or ticket_string is None:
  88         return _cas2_error_response(INVALID_REQUEST)
  89
  90     try:
  91         ticket = ServiceTicket.objects.get(ticket=ticket_string)
  92     except ServiceTicket.DoesNotExist:
  93         return _cas2_error_response(INVALID_TICKET)
  94
  95     if settings.CAS_CHECK_SERVICE and ticket.service != service:
  96         ticket.delete()
  97         return _cas2_error_response(INVALID_SERVICE)
  98
  99     username = ticket.user.username
 100     ticket.delete()
 101     return _cas2_sucess_response(username)
 102
 103
 104 def _cas2_error_response(code):
 105     return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
 106             <cas:authenticationFailure code="%(code)s">
 107                 %(message)s
 108             </cas:authenticationFailure>
 109         </cas:serviceResponse>''' % {
 110             'code': code,
 111             'message': dict(ERROR_MESSAGES).get(code)
 112     }, mimetype='text/xml')
 113
 114
 115 def _cas2_sucess_response(username):
 116     return HttpResponse(u'''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
 117         <cas:authenticationSuccess>
 118             <cas:user>%(username)s</cas:user>
 119         </cas:authenticationSuccess>
 120     </cas:serviceResponse>''' % {'username': username}, mimetype='text/xml')