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"""
A set of request processors that return dictionaries to be merged into a
template context. Each function takes the request object as its only parameter
and returns a dictionary to add to the context.
These are referenced from the setting TEMPLATE_CONTEXT_PROCESSORS and used by
RequestContext.
"""
from django.conf import settings
def auth(request):
"""
Returns context variables required by apps that use Django's authentication
system.
If there is no 'user' attribute in the request, uses AnonymousUser (from
django.contrib.auth).
"""
if hasattr(request, 'user'):
user = request.user
else:
from django.contrib.auth.models import AnonymousUser
user = AnonymousUser()
return {
'user': user,
'messages': user.get_and_delete_messages(),
'perms': PermWrapper(user),
}
def debug(request):
"Returns context variables helpful for debugging."
context_extras = {}
if settings.DEBUG and request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS:
context_extras['debug'] = True
from django.db import connection
context_extras['sql_queries'] = connection.queries
return context_extras
def i18n(request):
from django.utils import translation
context_extras = {}
context_extras['LANGUAGES'] = settings.LANGUAGES
context_extras['LANGUAGE_CODE'] = translation.get_language()
context_extras['LANGUAGE_BIDI'] = translation.get_language_bidi()
return context_extras
def media(request):
"""
Adds media-related context variables to the context.
"""
return {'MEDIA_URL': settings.MEDIA_URL}
def request(request):
return {'request': request}
# PermWrapper and PermLookupDict proxy the permissions system into objects that
# the template system can understand.
class PermLookupDict(object):
def __init__(self, user, module_name):
self.user, self.module_name = user, module_name
def __repr__(self):
return str(self.user.get_all_permissions())
def __getitem__(self, perm_name):
return self.user.has_perm("%s.%s" % (self.module_name, perm_name))
def __nonzero__(self):
return self.user.has_module_perms(self.module_name)
class PermWrapper(object):
def __init__(self, user):
self.user = user
def __getitem__(self, module_name):
return PermLookupDict(self.user, module_name)
def __iter__(self):
# I am large, I contain multitudes.
raise TypeError("PermWrapper is not iterable.")
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