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from django.core.exceptions import ObjectDoesNotExist
from django.template import Context, RequestContext, loader
from django.contrib.contenttypes.models import ContentType
from django.contrib.sites.models import Site
from django import http
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)
obj = content_type.get_object_for_this_type(pk=object_id)
except ObjectDoesNotExist:
raise http.Http404, "Content type %s object %s doesn't exist" % (content_type_id, object_id)
try:
absurl = obj.get_absolute_url()
except AttributeError:
raise http.Http404, "%s objects don't have get_absolute_url() methods" % content_type.name
# 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://'):
return http.HttpResponseRedirect(absurl)
object_domain = None
# Otherwise, we need to introspect the object's relationships for a
# relation to the Site object
opts = obj._meta
# First, look for an many-to-many relationship to sites
for field in opts.many_to_many:
if field.rel.to is Site:
try:
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.rel and field.rel.to 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().domain
except Site.DoesNotExist:
pass
# 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:
return http.HttpResponseRedirect('http://%s%s' % (object_domain, absurl))
else:
return http.HttpResponseRedirect(absurl)
def page_not_found(request, template_name='404.html'):
"""
Default 404 handler, which looks for the requested URL in the redirects
table, redirects if found, and displays 404 page if not redirected.
Templates: `404.html`
Context:
request_path
The path of the requested URL (e.g., '/app/pages/bad_page/')
"""
t = loader.get_template(template_name) # You need to create a 404.html template.
return http.HttpResponseNotFound(t.render(RequestContext(request, {'request_path': request.path})))
def server_error(request, template_name='500.html'):
"""
500 error handler.
Templates: `500.html`
Context: None
"""
t = loader.get_template(template_name) # You need to create a 500.html template.
return http.HttpResponseServerError(t.render(Context({})))
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