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from __future__ import unicode_literals
from django import http
from django.apps import apps
from django.contrib.contenttypes.models import ContentType
from django.contrib.sites.requests import RequestSite
from django.core.exceptions import ObjectDoesNotExist
from django.utils.translation import ugettext as _
def shortcut(request, content_type_id, object_id):
"""
Redirect to an object's page based on a content-type ID and an object ID.
"""
# Look up the object, making sure it's got a get_absolute_url() function.
try:
content_type = ContentType.objects.get(pk=content_type_id)
if not content_type.model_class():
raise http.Http404(_("Content type %(ct_id)s object has no associated model") %
{'ct_id': content_type_id})
obj = content_type.get_object_for_this_type(pk=object_id)
except (ObjectDoesNotExist, ValueError):
raise http.Http404(_("Content type %(ct_id)s object %(obj_id)s doesn't exist") %
{'ct_id': content_type_id, 'obj_id': object_id})
try:
get_absolute_url = obj.get_absolute_url
except AttributeError:
raise http.Http404(_("%(ct_name)s objects don't have a get_absolute_url() method") %
{'ct_name': content_type.name})
absurl = get_absolute_url()
# Try to figure out the object's domain, so we can do a cross-site redirect
# if necessary.
# If the object actually defines a domain, we're done.
if absurl.startswith(('http://', 'https://', '//')):
return http.HttpResponseRedirect(absurl)
# Otherwise, we need to introspect the object's relationships for a
# relation to the Site object
object_domain = None
if apps.is_installed('django.contrib.sites'):
Site = apps.get_model('sites.Site')
opts = obj._meta
# First, look for an many-to-many relationship to Site.
for field in opts.many_to_many:
if field.remote_field.model is Site:
try:
# Caveat: In the case of multiple related Sites, this just
# selects the *first* one, which is arbitrary.
object_domain = getattr(obj, field.name).all()[0].domain
except IndexError:
pass
if object_domain is not None:
break
# Next, look for a many-to-one relationship to Site.
if object_domain is None:
for field in obj._meta.fields:
if field.remote_field and field.remote_field.model is Site:
try:
object_domain = getattr(obj, field.name).domain
except Site.DoesNotExist:
pass
if object_domain is not None:
break
# Fall back to the current site (if possible).
if object_domain is None:
try:
object_domain = Site.objects.get_current(request).domain
except Site.DoesNotExist:
pass
else:
# Fall back to the current request's site.
object_domain = RequestSite(request).domain
# If all that malarkey found an object domain, use it. Otherwise, fall back
# to whatever get_absolute_url() returned.
if object_domain is not None:
protocol = request.scheme
return http.HttpResponseRedirect('%s://%s%s'
% (protocol, object_domain, absurl))
else:
return http.HttpResponseRedirect(absurl)
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