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