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import logging
import datetime
try:
from urllib import urlencode
except ImportError:
from urllib.parse import urlencode
try:
import urlparse
except ImportError:
import urllib.parse as urlparse
from operator import itemgetter
from django.http import HttpResponseRedirect, HttpResponseForbidden, HttpResponse
from django.conf import settings
from django.contrib.auth import REDIRECT_FIELD_NAME
from django.contrib import auth
try:
from django.urls import reverse
except ImportError:
from django.core.urlresolvers import reverse
from cas.models import PgtIOU
__all__ = ['login', 'logout']
logger = logging.getLogger(__name__)
def _service_url(request, redirect_to=None, gateway=False):
"""
Generates application service URL for CAS
:param: request Request Object
:param: redirect_to URL to redriect to
:param: gateway Should this be a gatewayed pass through
"""
if settings.CAS_FORCE_SSL_SERVICE_URL:
protocol = 'https://'
else:
protocol = ('http://', 'https://')[request.is_secure()]
host = request.get_host()
service = protocol + host + request.path
if redirect_to:
if '?' in service:
service += '&'
else:
service += '?'
if gateway:
""" If gateway, capture params and reencode them before returning a url """
gateway_params = [(REDIRECT_FIELD_NAME, redirect_to), ('gatewayed', 'true')]
query_dict = request.GET.copy()
try:
del query_dict['ticket']
except:
pass
query_list = query_dict.items()
# remove duplicate params
for item in query_list:
for index, item2 in enumerate(gateway_params):
if item[0] == item2[0]:
gateway_params.pop(index)
extra_params = gateway_params + list(query_dict.items())
#Sort params by key name so they are always in the same order.
sorted_params = sorted(extra_params, key=itemgetter(0))
service += urlencode(sorted_params)
else:
service += urlencode({REDIRECT_FIELD_NAME: redirect_to})
return service
def _redirect_url(request):
"""
Redirects to referring page, or CAS_REDIRECT_URL if no referrer is
set.
:param: request RequestObj
"""
next = request.GET.get(REDIRECT_FIELD_NAME)
if not next:
if settings.CAS_IGNORE_REFERER:
next = settings.CAS_REDIRECT_URL
else:
next = request.META.get('HTTP_REFERER', settings.CAS_REDIRECT_URL)
host = request.get_host()
prefix = (('http://', 'https://')[request.is_secure()] + host)
if next.startswith(prefix):
next = next[len(prefix):]
return next
def _login_url(service, ticket='ST', gateway=False):
"""
Generates CAS login URL
:param: service Service URL
:param: ticket Ticket
:param: gateway Gatewayed
"""
LOGINS = {'ST': 'login',
'PT': 'proxyValidate'}
if gateway:
params = {'service': service, 'gateway': 'true'}
else:
params = {'service': service}
if settings.CAS_EXTRA_LOGIN_PARAMS:
params.update(settings.CAS_EXTRA_LOGIN_PARAMS)
if not ticket:
ticket = 'ST'
login_type = LOGINS.get(ticket[:2], 'login')
return urlparse.urljoin(settings.CAS_SERVER_URL, login_type) + '?' + urlencode(params)
def _logout_url(request, next_page=None):
"""
Generates CAS logout URL
:param: request RequestObj
:param: next_page Page to redirect after logout.
"""
url = urlparse.urljoin(settings.CAS_SERVER_URL, 'logout')
if next_page and getattr(settings, 'CAS_PROVIDE_URL_TO_LOGOUT', True):
parsed_url = urlparse.urlparse(next_page)
if parsed_url.scheme: #If next_page is a protocol-rooted url, skip redirect url construction
url += '?' + urlencode({'service': next_page})
else:
protocol = ('http://', 'https://')[request.is_secure()]
host = request.get_host()
url += '?' + urlencode({'service': protocol + host + next_page})
return url
def login(request, next_page=None, required=False, gateway=False):
"""
Forwards to CAS login URL or verifies CAS ticket
:param: request RequestObj
:param: next_page Next page to redirect after login
:param: required
:param: gateway Gatewayed response
"""
if not next_page:
next_page = _redirect_url(request)
try:
# use callable for pre-django 2.0
is_authenticated = request.user.is_authenticated()
except TypeError:
is_authenticated = request.user.is_authenticated
if is_authenticated:
return HttpResponseRedirect(next_page)
ticket = request.GET.get('ticket')
if gateway:
service = _service_url(request, next_page, True)
else:
service = _service_url(request, next_page, False)
if ticket:
user = auth.authenticate(request=request, ticket=ticket, service=service)
if user is not None:
auth.login(request, user)
if settings.CAS_PROXY_CALLBACK:
proxy_callback(request)
return HttpResponseRedirect(next_page)
elif settings.CAS_RETRY_LOGIN or required:
if gateway:
return HttpResponseRedirect(_login_url(service, ticket, True))
else:
return HttpResponseRedirect(_login_url(service, ticket, False))
else:
logger.warning('User has a valid ticket but not a valid session')
# Has ticket, not session
if gateway:
# Gatewayed responses should nto redirect.
return False
if getattr(settings, 'CAS_CUSTOM_FORBIDDEN'):
return HttpResponseRedirect(reverse(settings.CAS_CUSTOM_FORBIDDEN) + "?" + request.META['QUERY_STRING'])
else:
error = "<h1>Forbidden</h1><p>Login failed.</p>"
return HttpResponseForbidden(error)
else:
if gateway:
return HttpResponseRedirect(_login_url(service, ticket, True))
else:
return HttpResponseRedirect(_login_url(service, ticket, False))
def logout(request, next_page=None):
"""
Redirects to CAS logout page
:param: request RequestObj
:param: next_page Page to redirect to
"""
auth.logout(request)
if not next_page:
next_page = _redirect_url(request)
if settings.CAS_LOGOUT_COMPLETELY:
return HttpResponseRedirect(_logout_url(request, next_page))
else:
return HttpResponseRedirect(next_page)
def proxy_callback(request):
"""Handles CAS 2.0+ XML-based proxy callback call.
Stores the proxy granting ticket in the database for
future use.
NB: Use created and set it in python in case database
has issues with setting up the default timestamp value
"""
pgtIou = request.GET.get('pgtIou')
tgt = request.GET.get('pgtId')
if not (pgtIou and tgt):
logger.info('No pgtIou or tgt found in request.GET')
return HttpResponse('No pgtIOO', content_type="text/plain")
try:
PgtIOU.objects.create(tgt=tgt, pgtIou=pgtIou, created=datetime.datetime.now())
request.session['pgt-TICKET'] = pgtIou
return HttpResponse('PGT ticket is: {ticket}'.format(ticket=pgtIou), content_type="text/plain")
except Exception as e:
logger.warning('PGT storage failed. {message}'.format(
message=e
))
return HttpResponse('PGT storage failed for {request}'.format(request=str(request.GET)),
content_type="text/plain")
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