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venv/Lib/site-packages/django/contrib/auth/context_processors.py

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+# PermWrapper and PermLookupDict proxy the permissions system into objects that
+# the template system can understand.
+
+
+class PermLookupDict:
+    def __init__(self, user, app_label):
+        self.user, self.app_label = user, app_label
+
+    def __repr__(self):
+        return str(self.user.get_all_permissions())
+
+    def __getitem__(self, perm_name):
+        return self.user.has_perm("%s.%s" % (self.app_label, perm_name))
+
+    def __iter__(self):
+        # To fix 'item in perms.someapp' and __getitem__ interaction we need to
+        # define __iter__. See #18979 for details.
+        raise TypeError("PermLookupDict is not iterable.")
+
+    def __bool__(self):
+        return self.user.has_module_perms(self.app_label)
+
+
+class PermWrapper:
+    def __init__(self, user):
+        self.user = user
+
+    def __repr__(self):
+        return f'{self.__class__.__qualname__}({self.user!r})'
+
+    def __getitem__(self, app_label):
+        return PermLookupDict(self.user, app_label)
+
+    def __iter__(self):
+        # I am large, I contain multitudes.
+        raise TypeError("PermWrapper is not iterable.")
+
+    def __contains__(self, perm_name):
+        """
+        Lookup by "someapp" or "someapp.someperm" in perms.
+        """
+        if '.' not in perm_name:
+            # The name refers to module.
+            return bool(self[perm_name])
+        app_label, perm_name = perm_name.split('.', 1)
+        return self[app_label][perm_name]
+
+
+def auth(request):
+    """
+    Return context variables required by apps that use Django's authentication
+    system.
+
+    If there is no 'user' attribute in the request, use 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,
+        'perms': PermWrapper(user),
+    }