Added missing context_processors module from [1773]

git-svn-id: http://code.djangoproject.com/svn/django/trunk@1774 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/context_processors.py

@@ -0,0 +1,58 @@
+"""
+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
+DjangoContext.
+"""
+
+from django.conf.settings import DEBUG, INTERNAL_IPS, LANGUAGES, LANGUAGE_CODE
+
+def auth(request):
+    """
+    Returns context variables required by apps that use Django's authentication
+    system.
+    """
+    return {
+        'user': request.user,
+        'messages': request.user.get_and_delete_messages(),
+        'perms': PermWrapper(request.user),
+    }
+
+def debug(request):
+    "Returns context variables helpful for debugging."
+    context_extras = {}
+    if DEBUG and request.META.get('REMOTE_ADDR') in INTERNAL_IPS:
+        context_extras['debug'] = True
+        from django.core import db
+        context_extras['sql_queries'] = db.db.queries
+    return context_extras
+
+def i18n(request):
+    context_extras = {}
+    context_extras['LANGUAGES'] = LANGUAGES
+    if hasattr(request, 'LANGUAGE_CODE'):
+        context_extras['LANGUAGE_CODE'] = request.LANGUAGE_CODE
+    else:
+        context_extras['LANGUAGE_CODE'] = LANGUAGE_CODE
+    return context_extras
+
+# PermWrapper and PermLookupDict proxy the permissions system into objects that
+# the template system can understand.
+
+class PermLookupDict:
+    def __init__(self, user, module_name):
+        self.user, self.module_name = user, module_name
+    def __repr__(self):
+        return str(self.user.get_permission_list())
+    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:
+    def __init__(self, user):
+        self.user = user
+    def __getitem__(self, module_name):
+        return PermLookupDict(self.user, module_name)