diff -r 044dc196ec8a -r d3668ecd9137 src/ztfy/utils/security.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ztfy/utils/security.py	Wed Jun 20 16:29:53 2012 +0200
@@ -0,0 +1,84 @@
+### -*- coding: utf-8 -*- ####################################################
+##############################################################################
+#
+# Copyright (c) 2008 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+
+# import standard packages
+from persistent.list import PersistentList
+from persistent.dict import PersistentDict
+
+# import Zope3 interfaces
+from zope.authentication.interfaces import IAuthentication
+from zope.pluggableauth.interfaces import IPrincipalInfo
+
+# import local interfaces
+
+# import Zope3 packages
+from zc.set import Set
+from zope.component import getUtility
+from zope.deprecation.deprecation import deprecate
+from zope.i18n import translate
+from zope.interface import implements
+from zope.security.proxy import removeSecurityProxy
+
+# import local packages
+from ztfy.utils.request import getRequest
+
+from ztfy.utils import _
+
+
+def unproxied(value):
+    """Remove security proxies from given value ; if value is a list or dict, all elements are unproxied"""
+    if isinstance(value, (list, PersistentList)):
+        result = []
+        for v in value:
+            result.append(unproxied(v))
+    elif isinstance(value, (dict, PersistentDict)):
+        result = value.copy()
+        for v in value:
+            result[v] = unproxied(value[v])
+    elif isinstance(value, (set, Set)):
+        result = []
+        for v in value:
+            result.append(unproxied(v))
+    else:
+        result = removeSecurityProxy(value)
+    return result
+
+
+@deprecate("ztfy.utils.security.MissingPrincipal is deprecated. Use ztfy.security.search.MissingPrincipal class instead.")
+class MissingPrincipal(object):
+
+    implements(IPrincipalInfo)
+
+    def __init__(self, id):
+        self.id = id
+        self.request = getRequest()
+
+    @property
+    def title(self):
+        return translate(_("< missing principal %s >"), context=self.request) % self.id
+
+    @property
+    def description(self):
+        return translate(_("This principal can't be found in any authentication utility..."), context=self.request)
+
+
+@deprecate("ztfy.utils.security.getPrincipal is deprecated. Use ztfy.security.search.getPrincipal function instead.")
+def getPrincipal(uid):
+    principals = getUtility(IAuthentication)
+    try:
+        return principals.getPrincipal(uid)
+    except:
+        return MissingPrincipal(uid)