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from django.http import HttpResponse, Http404, HttpResponseRedirect
from django.contrib.auth.decorators import login_required
from django.db import transaction
from django.shortcuts import get_object_or_404
from django.utils import timezone
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods
from django.conf import settings
from datetime import datetime, timedelta, time
from urllib.parse import urlparse, parse_qsl, urlencode
import json
import jwt
from postgresqleu.util.crypto import rsa_get_jwk_struct
from postgresqleu.util.random import generate_random_token
from postgresqleu.util.decorators import global_login_exempt
from .util import get_conference_or_404, activate_conference_timezone, reglog
from .models import ConferenceRegistration, ConferenceRegistrationTemporaryToken
@global_login_exempt
def jwk_json(request, confname):
conference = get_conference_or_404(confname)
if not conference.key_public:
raise Http404()
r = HttpResponse(json.dumps(
{
'keys': [
rsa_get_jwk_struct(conference.key_public, '{}01'.format(conference.urlname)),
]
}
), content_type='application/json')
# Everybody is allowed to get the JWKs
r['Access-Control-Allow-Origin'] = '*'
return r
@login_required
def conference_temp_token(request, confname):
redir = request.GET.get('redir', None)
if not redir:
return HttpResponse("Mandatory parameter missing", status=404)
redir = urlparse(redir)
# Create, or replace, a temporary token for this login, which can later be exchanged for a full JWT.
conference = get_conference_or_404(confname)
if not conference.key_public:
return HttpResponse("Conference key not found", status=404)
# Explicitly compare scheme/location/path, but *not* the querystring.
if redir._replace(query=None, fragment=None).geturl() not in conference.web_origins.split(','):
return HttpResponse("Forbidden redirect URL", status=403)
try:
reg = ConferenceRegistration.objects.get(conference=conference, attendee=request.user)
except ConferenceRegistration.DoesNotExist:
return HttpResponse("You are not registered for this conference", status=403, content_type='text/plain')
if not reg.payconfirmedat:
return HttpResponse("Not confirmed for this conference", status=403, conten_type='text/plain')
with transaction.atomic():
# If there is an existing token for this user, just remove it.
ConferenceRegistrationTemporaryToken.objects.filter(reg=reg).delete()
# Create a new one
t = ConferenceRegistrationTemporaryToken(
reg=reg,
token=generate_random_token(),
expires=timezone.now() + timedelta(minutes=5),
)
t.save()
reglog(reg, 'Issued temporary token', request.user)
# If there are any parameters included in the redirect, we just append ours to it
param = dict(parse_qsl(redir.query))
param['token'] = t.token
return HttpResponseRedirect(redir._replace(query=urlencode(param)).geturl())
class CorsResponse(HttpResponse):
def __init__(self, *args, **kwargs):
origin = kwargs.pop('origin')
allowed = kwargs.pop('allowed')
super().__init__(*args, **kwargs)
if origin:
if allowed:
# Origin is specified, so validate it against it
for o in allowed.split(','):
if o == origin:
matched_origin = o
break
else:
return self._set_403("Origin not authorized")
else:
# If no origin is configured, we're going to use our own sitebase only
if origin != settings.SITEBASE:
return self._set_403("No authorized origins configured")
matched_origin = settings.SITEBASE
else:
matched_origin = settings.SITEBASE
self['Access-Control-Allow-Origin'] = matched_origin
def _set_403(self, msg):
self.content = msg
self.status = 403
@transaction.atomic
@csrf_exempt
@global_login_exempt
@require_http_methods(["POST"])
def conference_jwt(request, confname):
temptoken = get_object_or_404(ConferenceRegistrationTemporaryToken, token=request.POST.get('token', None))
reg = temptoken.reg
activate_conference_timezone(reg.conference)
if temptoken.expires < timezone.now():
# Remove the old token as well
temptoken.delete()
return CorsResponse("Token expired", status=403, origin=request.headers.get('Origin', ''), allowed=reg.conference.web_origins)
# Token was valid -- so the first thing we do is remove it
temptoken.delete()
reglog(reg, 'Converted temporary to permanent token')
# We allow caching of the token until a full day after the conference. This may not be the
# smartest ever, but it'll do for now and reduce the reliance on this endpoint being
# available during an event.
expire = datetime.combine(reg.conference.enddate, time(23, 59)) + timedelta(days=1)
# Else we're good to go to generate the JWT
r = CorsResponse(jwt.encode(
{
'iat': datetime.utcnow(),
'exp': expire,
'iss': settings.SITEBASE,
'attendee': {
'name': reg.fullname,
'email': reg.email,
'company': reg.company,
'nick': reg.nick,
'twittername': reg.twittername,
'shareemail': reg.shareemail,
'regid': reg.id,
'country': reg.countryname,
'volunteer': reg.is_volunteer,
'admin': reg.is_admin,
}
},
reg.conference.key_private,
algorithm='RS256',
headers={
'kid': '{}01'.format(reg.conference.urlname),
},
), content_type='application/jwt', origin=request.headers.get('Origin', ''), allowed=reg.conference.web_origins)
return r
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