get principal title if person not present

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@3054 fd906abe-77d9-0310-91a1-e0d9ade77398

organize/configure.zcml

@@ -59,8 +59,7 @@
         for="loops.interfaces.ILoopsObject
              zope.publisher.interfaces.browser.IBrowserRequest"
         factory="loops.organize.memberinfo.MemberInfoProvider"
-        permission="zope.Public"
+        permission="zope.Public" />
-        />
 
   <zope:adapter factory="loops.organize.setup.SetupManager"
                 name="organize" />

organize/tracking/browser.py

@@ -22,6 +22,8 @@ View class(es) for change tracks.
 $Id$
 """
 
+from zope import component
+from zope.app.security.interfaces import IAuthentication, PrincipalLookupError
 from zope.cachedescriptors.property import Lazy
 from zope.traversing.browser import absoluteURL
 from zope.traversing.api import getName
@@ -57,13 +59,20 @@ class BaseTrackView(TrackView):
             obj = util.getObjectForUid(uid)
             if obj is not None:
                 return obj
-        return uid
+        try:
+            return self.authentication.getPrincipal(uid) or uid
+        except PrincipalLookupError:
+            return uid
+
+    @Lazy
+    def authentication(self):
+        return component.getUtility(IAuthentication)
 
     @Lazy
     def userTitle(self):
         if isinstance(self.user, basestring):
             return self.user
-        return getattr(self.user, 'title', getName(self.user))
+        return self.user.title
 
     @Lazy
     def userUrl(self):