Edited README.rst via GitHub

[django-cas-provider.git] / cas_provider / views.py

diff --git a/cas_provider/views.py b/cas_provider/views.py
index 7a3e690..717aa6f 100644 (file)
--- a/cas_provider/views.py
+++ b/cas_provider/views.py
@@ -1,16 +1,21 @@
+from lxml import etree
+from urllib import urlencode
+import urllib2
+import urlparse

 from django.conf import settings
 from django.contrib.auth import login as auth_login, logout as auth_logout
 from django.core.urlresolvers import get_callable
 from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render_to_response
 from django.template import RequestContext
 from django.conf import settings
 from django.contrib.auth import login as auth_login, logout as auth_logout
 from django.core.urlresolvers import get_callable
 from django.http import HttpResponse, HttpResponseRedirect
 from django.shortcuts import render_to_response
 from django.template import RequestContext

+from cas_provider.attribute_formatters import NSMAP, CAS
+from cas_provider.models import ProxyGrantingTicket, ProxyTicket

 from forms import LoginForm
 from models import ServiceTicket, LoginTicket
 
 
 __all__ = ['login', 'validate', 'logout', 'service_validate']
 
 from forms import LoginForm
 from models import ServiceTicket, LoginTicket
 
 
 __all__ = ['login', 'validate', 'logout', 'service_validate']
 

-

 INVALID_TICKET = 'INVALID_TICKET'
 INVALID_SERVICE = 'INVALID_SERVICE'
 INVALID_REQUEST = 'INVALID_REQUEST'
 INVALID_TICKET = 'INVALID_TICKET'
 INVALID_SERVICE = 'INVALID_SERVICE'
 INVALID_REQUEST = 'INVALID_REQUEST'


@@ -21,13 +26,13 @@ ERROR_MESSAGES = (
     (INVALID_SERVICE, u'Service is invalid'),
     (INVALID_REQUEST, u'Not all required parameters were sent.'),
     (INTERNAL_ERROR, u'An internal error occurred during ticket validation'),
     (INVALID_SERVICE, u'Service is invalid'),
     (INVALID_REQUEST, u'Not all required parameters were sent.'),
     (INTERNAL_ERROR, u'An internal error occurred during ticket validation'),

-)
+    )

 
 
 
 

-def login(request, template_name='cas/login.html', \
-                success_redirect=settings.LOGIN_REDIRECT_URL,
-                warn_template_name='cas/warn.html',
-                form_class=LoginForm):
+def login(request, template_name='cas/login.html',\
+          success_redirect=settings.LOGIN_REDIRECT_URL,
+          warn_template_name='cas/warn.html',
+          form_class=LoginForm):

     service = request.GET.get('service', None)
     if request.user.is_authenticated():
         if service is not None:
     service = request.GET.get('service', None)
     if request.user.is_authenticated():
         if service is not None:


@@ -60,7 +65,7 @@ def login(request, template_name='cas/login.html', \
     return render_to_response(template_name, {
         'form': form,
         'errors': form.get_errors() if hasattr(form, 'get_errors') else None,
     return render_to_response(template_name, {
         'form': form,
         'errors': form.get_errors() if hasattr(form, 'get_errors') else None,

-    }, context_instance=RequestContext(request))
+        }, context_instance=RequestContext(request))

 
 
 def validate(request):
 
 
 def validate(request):


@@ -75,28 +80,40 @@ def validate(request):
             ticket = ServiceTicket.objects.get(ticket=ticket_string)
             assert ticket.service == service
             username = ticket.user.username
             ticket = ServiceTicket.objects.get(ticket=ticket_string)
             assert ticket.service == service
             username = ticket.user.username

-            ticket.delete()

             return HttpResponse("yes\n%s\n" % username)
         except:
             pass
     return HttpResponse("no\n\n")
 
 
             return HttpResponse("yes\n%s\n" % username)
         except:
             pass
     return HttpResponse("no\n\n")
 
 

-def logout(request, template_name='cas/logout.html', \
-                auto_redirect=settings.CAS_AUTO_REDIRECT_AFTER_LOGOUT):
+def logout(request, template_name='cas/logout.html',
+           auto_redirect=settings.CAS_AUTO_REDIRECT_AFTER_LOGOUT):

     url = request.GET.get('url', None)
     if request.user.is_authenticated():
     url = request.GET.get('url', None)
     if request.user.is_authenticated():

+        for ticket in ServiceTicket.objects.filter(user = request.user):
+            ticket.delete()

         auth_logout(request)
         if url and auto_redirect:
             return HttpResponseRedirect(url)
         auth_logout(request)
         if url and auto_redirect:
             return HttpResponseRedirect(url)

-    return render_to_response(template_name, {'url': url}, \
+    return render_to_response(template_name, {'url': url},\

                               context_instance=RequestContext(request))
 
                               context_instance=RequestContext(request))
 

+def proxy(request):
+    targetService =  request.GET['targetService']
+    pgtiou = request.GET['pgt']

 
 

-def service_validate(request):
-    """Validate ticket via CAS v.2 protocol"""
-    service = request.GET.get('service', None)
-    ticket_string = request.GET.get('ticket', None)
+    try:
+        proxyGrantingTicket = ProxyGrantingTicket.objects.get(pgtiou=pgtiou)
+    except ProxyGrantingTicket.DoesNotExist:
+        return _cas2_error_response(INVALID_TICKET)
+
+    pt = ProxyTicket.objects.create(proxyGrantingTicket = proxyGrantingTicket,
+        user=proxyGrantingTicket.serviceTicket.user,
+        service=targetService)
+    return _cas2_proxy_success(pt.ticket)
+
+
+def ticket_validate(service, ticket_string, pgtUrl):

     if service is None or ticket_string is None:
         return _cas2_error_response(INVALID_REQUEST)
 
     if service is None or ticket_string is None:
         return _cas2_error_response(INVALID_REQUEST)
 


@@ -106,31 +123,99 @@ def service_validate(request):
         return _cas2_error_response(INVALID_TICKET)
 
     if ticket.service != service:
         return _cas2_error_response(INVALID_TICKET)
 
     if ticket.service != service:

-        ticket.delete()

         return _cas2_error_response(INVALID_SERVICE)
 
         return _cas2_error_response(INVALID_SERVICE)
 

+
+    pgtIouId = None
+    proxies = ()
+    if pgtUrl is not None:
+        pgt = generate_proxy_granting_ticket(pgtUrl, ticket)
+        if pgt:
+            pgtIouId = pgt.pgtiou
+
+            while pgt:
+                proxies += (pgt.serviceTicket.service,)
+                pgt = pgt.serviceTicket.proxyGrantingTicket if hasattr(pgt.serviceTicket, 'proxyGrantingTicket') else None
+
+

     user = ticket.user
     user = ticket.user

-    ticket.delete()
-    return _cas2_sucess_response(user)
+    return _cas2_sucess_response(user, pgtIouId, proxies)
+
+
+def service_validate(request):
+    """Validate ticket via CAS v.2 protocol"""
+    service = request.GET.get('service', None)
+    ticket_string = request.GET.get('ticket', None)
+    pgtUrl = request.GET.get('pgtUrl', None)
+    if ticket_string.startswith('PT-'):
+        return _cas2_error_response(INVALID_TICKET, "serviceValidate cannot verify proxy tickets")
+    else:
+        return ticket_validate(service, ticket_string, pgtUrl)

 
 
 
 

-def _cas2_error_response(code):
+def proxy_validate(request):
+    """Validate ticket via CAS v.2 protocol"""
+    service = request.GET.get('service', None)
+    ticket_string = request.GET.get('ticket', None)
+    pgtUrl = request.GET.get('pgtUrl', None)
+    return ticket_validate(service, ticket_string, pgtUrl)
+
+def generate_proxy_granting_ticket(pgt_url, ticket):
+    proxy_callback_good_status = (200, 202, 301, 302, 304)
+    uri = list(urlparse.urlsplit(pgt_url))
+
+    pgt = ProxyGrantingTicket()
+    pgt.serviceTicket = ticket
+
+    if hasattr(ticket, 'proxyGrantingTicket'):
+        # here we got a proxy ticket! tata!
+        pgt.pgt = ticket.proxyGrantingTicket
+
+    params = {'pgtId': pgt.ticket, 'pgtIou': pgt.pgtiou}
+
+    query = dict(urlparse.parse_qsl(uri[4]))
+    query.update(params)
+
+    uri[4] = urlencode(query)
+
+
+    try:
+        response = urllib2.urlopen(urlparse.urlunsplit(uri))
+    except urllib2.HTTPError, e:
+        if not e.code in proxy_callback_good_status:
+            return
+    except urllib2.URLError, e:
+        return
+
+    pgt.save()
+    return pgt
+
+
+def _cas2_proxy_success(pt):
+    return HttpResponse(proxy_success(pt))
+
+def _cas2_sucess_response(user, pgt = None, proxies = None):
+    return HttpResponse(auth_success_response(user, pgt, proxies), mimetype='text/xml')
+
+def _cas2_error_response(code, message = None):

     return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
             <cas:authenticationFailure code="%(code)s">
                 %(message)s
             </cas:authenticationFailure>
         </cas:serviceResponse>''' % {
             'code': code,
     return HttpResponse(u''''<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
             <cas:authenticationFailure code="%(code)s">
                 %(message)s
             </cas:authenticationFailure>
         </cas:serviceResponse>''' % {
             'code': code,

-            'message': dict(ERROR_MESSAGES).get(code)
+            'message': message if message else dict(ERROR_MESSAGES).get(code)

     }, mimetype='text/xml')
 
     }, mimetype='text/xml')
 

+def proxy_success(pt):
+    response = etree.Element(CAS + 'serviceResponse', nsmap=NSMAP)
+    proxySuccess = etree.SubElement(response, CAS + 'proxySuccess')
+    proxyTicket = etree.SubElement(proxySuccess, CAS + 'proxyTicket')
+    proxyTicket.text = pt
+    return unicode(etree.tostring(response, encoding='utf-8'), 'utf-8')

 
 

-def _cas2_sucess_response(user):
-    return HttpResponse(auth_success_response(user), mimetype='text/xml')
-
+def auth_success_response(user, pgt, proxies):

 
 

-def auth_success_response(user):
-    from attribute_formatters import CAS, NSMAP, etree

 
     response = etree.Element(CAS + 'serviceResponse', nsmap=NSMAP)
     auth_success = etree.SubElement(response, CAS + 'authenticationSuccess')
 
     response = etree.Element(CAS + 'serviceResponse', nsmap=NSMAP)
     auth_success = etree.SubElement(response, CAS + 'authenticationSuccess')


@@ -143,4 +228,18 @@ def auth_success_response(user):
         if len(attrs) > 0:
             formater = get_callable(settings.CAS_CUSTOM_ATTRIBUTES_FORMATER)
             formater(auth_success, attrs)
         if len(attrs) > 0:
             formater = get_callable(settings.CAS_CUSTOM_ATTRIBUTES_FORMATER)
             formater(auth_success, attrs)

+
+
+    if pgt:
+        pgtElement = etree.SubElement(auth_success, CAS + 'proxyGrantingTicket')
+        pgtElement.text = pgt
+
+    if proxies:
+        proxiesElement = etree.SubElement(auth_success , CAS + "proxies")
+        for proxy in proxies:
+            proxyElement = etree.SubElement(proxiesElement, CAS + "proxy")
+            proxyElement.text = proxy
+
+
+

     return unicode(etree.tostring(response, encoding='utf-8'), 'utf-8')
     return unicode(etree.tostring(response, encoding='utf-8'), 'utf-8')