118 lines
4.0 KiB
Python
118 lines
4.0 KiB
Python
"""
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A set of request processors that return dictionaries to be merged into a
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template context. Each function takes the request object as its only parameter
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and returns a dictionary to add to the context.
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These are referenced from the setting TEMPLATE_CONTEXT_PROCESSORS and used by
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RequestContext.
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"""
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from django.conf import settings
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from django.utils.functional import lazy, memoize, LazyObject
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class ContextLazyObject(LazyObject):
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"""
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A lazy object initialised from any function, useful for lazily
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adding things to the Context.
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Designed for compound objects of unknown type. For simple objects of known
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type, use django.utils.functional.lazy.
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"""
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def __init__(self, func):
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"""
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Pass in a callable that returns the actual value to be used
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"""
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self.__dict__['_setupfunc'] = func
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# For some reason, we have to inline LazyObject.__init__ here to avoid
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# recursion
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self._wrapped = None
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def _setup(self):
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self._wrapped = self._setupfunc()
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def auth(request):
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"""
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Returns context variables required by apps that use Django's authentication
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system.
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If there is no 'user' attribute in the request, uses AnonymousUser (from
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django.contrib.auth).
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"""
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# If we access request.user, request.session is accessed, which results in
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# 'Vary: Cookie' being sent in every request that uses this context
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# processor, which can easily be every request on a site if
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# TEMPLATE_CONTEXT_PROCESSORS has this context processor added. This kills
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# the ability to cache. So, we carefully ensure these attributes are lazy.
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# We don't use django.utils.functional.lazy() for User, because that
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# requires knowing the class of the object we want to proxy, which could
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# break with custom auth backends. LazyObject is a less complete but more
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# flexible solution that is a good enough wrapper for 'User'.
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def get_user():
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if hasattr(request, 'user'):
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return request.user
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else:
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from django.contrib.auth.models import AnonymousUser
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return AnonymousUser()
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return {
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'user': ContextLazyObject(get_user),
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'messages': lazy(memoize(lambda: get_user().get_and_delete_messages(), {}, 0), list)(),
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'perms': lazy(lambda: PermWrapper(get_user()), PermWrapper)(),
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}
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def debug(request):
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"Returns context variables helpful for debugging."
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context_extras = {}
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if settings.DEBUG and request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS:
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context_extras['debug'] = True
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from django.db import connection
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context_extras['sql_queries'] = connection.queries
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return context_extras
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def i18n(request):
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from django.utils import translation
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context_extras = {}
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context_extras['LANGUAGES'] = settings.LANGUAGES
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context_extras['LANGUAGE_CODE'] = translation.get_language()
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context_extras['LANGUAGE_BIDI'] = translation.get_language_bidi()
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return context_extras
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def media(request):
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"""
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Adds media-related context variables to the context.
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"""
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return {'MEDIA_URL': settings.MEDIA_URL}
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def request(request):
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return {'request': request}
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# PermWrapper and PermLookupDict proxy the permissions system into objects that
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# the template system can understand.
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class PermLookupDict(object):
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def __init__(self, user, module_name):
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self.user, self.module_name = user, module_name
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def __repr__(self):
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return str(self.user.get_all_permissions())
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def __getitem__(self, perm_name):
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return self.user.has_perm("%s.%s" % (self.module_name, perm_name))
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def __nonzero__(self):
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return self.user.has_module_perms(self.module_name)
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class PermWrapper(object):
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def __init__(self, user):
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self.user = user
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def __getitem__(self, module_name):
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return PermLookupDict(self.user, module_name)
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def __iter__(self):
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# I am large, I contain multitudes.
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raise TypeError("PermWrapper is not iterable.")
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