34 lines
1.4 KiB
Python
34 lines
1.4 KiB
Python
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from django.core.context_processors import PermWrapper
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from django.utils.functional import lazy, memoize, SimpleLazyObject
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from django.contrib import messages
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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': SimpleLazyObject(get_user),
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'messages': messages.get_messages(request),
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'perms': lazy(lambda: PermWrapper(get_user()), PermWrapper)(),
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}
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