ContentHistory.py

   1 # -*- coding: utf-8 -*-
   2 #######################################################################################
   3 #   Plinn - http://plinn.org                                                          #
   4 #   Copyright © 2005-2009  Benoît PIN <benoit.pin@ensmp.fr>                           #
   5 #                                                                                     #
   6 #   This program is free software; you can redistribute it and/or                     #
   7 #   modify it under the terms of the GNU General Public License                       #
   8 #   as published by the Free Software Foundation; either version 2                    #
   9 #   of the License, or (at your option) any later version.                            #
  10 #                                                                                     #
  11 #   This program is distributed in the hope that it will be useful,                   #
  12 #   but WITHOUT ANY WARRANTY; without even the implied warranty of                    #
  13 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                     #
  14 #   GNU General Public License for more details.                                      #
  15 #                                                                                     #
  16 #   You should have received a copy of the GNU General Public License                 #
  17 #   along with this program; if not, write to the Free Software                       #
  18 #   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   #
  19 #######################################################################################
  20 """
  21 Module to manage history of contents (comparisons, copy to present).
  22
  23
  24
  25 """
  26
  27 from Globals import InitializeClass
  28 from AccessControl import ClassSecurityInfo
  29 from ExtensionClass import Base
  30 import Acquisition
  31 from zope.interface import implements
  32 from OFS.History import historicalRevision
  33 from Products.PluginIndexes.common import safe_callable
  34 from interfaces import IContentHistory
  35 from Products.CMFCore.permissions import ModifyPortalContent
  36 from permissions import ViewHistory
  37 from struct import pack, unpack
  38 from DateTime import DateTime
  39
  40 class ContentHistory(Base, Acquisition.Implicit) :
  41         """ Utility to manage historical entries of a content
  42         """
  43         implements(IContentHistory)
  44         security = ClassSecurityInfo()
  45
  46         def __init__(self, content) :
  47                 self._content = content
  48
  49         security.declareProtected(ViewHistory, 'listEntries')
  50         def listEntries(self, first=0, last=20):
  51                 oid = self._content._p_oid
  52                 db = self._content._p_jar.db()
  53                 r = db.history(oid, size=last)
  54
  55                 if r is None:
  56                         # storage doesn't support history
  57                         return ()
  58
  59                 r=r[first:]
  60
  61                 for d in r:
  62                         d['time']=DateTime(d['time'])
  63                         d['key']='.'.join(map(str, unpack(">HHHH", d['tid'])))
  64
  65                 return r
  66
  67         security.declareProtected(ViewHistory, 'getHistoricalRevisionByKey')
  68         def getHistoricalRevisionByKey(self, key, withContext=False):
  69
  70                 serial = apply(pack, ('>HHHH',) + tuple(map(int, key.split('.'))))
  71                 content = self._content
  72                 rev = historicalRevision(content, serial)
  73                 rev = rev.__of__(content.aq_parent)
  74                 if withContext is False :
  75                         return rev, DateTime(rev._p_mtime)
  76                 else :
  77                         ctx = {}
  78                         if isinstance(withContext, int) :
  79                                 first = max(withContext-1, 0)
  80                                 entries = self.listEntries(first=first, last=withContext+2)
  81
  82                         if len(entries) == 3 :
  83                                 ctx['next'], ctx['current'], ctx['previous'] = entries
  84                         elif len(entries) == 2 :
  85                                 serials = [e['tid'] for e in entries]
  86                                 i =  serials.index(serial)
  87                                 if i == 0 :
  88                                         # last (newest) transaction
  89                                         ctx['current'], ctx['previous'] = entries
  90                                 else :
  91                                         ctx['next'], ctx['current'] = entries
  92                         elif len(entries) == 1 :
  93                                 ctx['current'] = entries[0]
  94                         return rev, ctx
  95
  96
  97         security.declareProtected(ViewHistory, 'compare')
  98         def compare(self, leftkey, rightkey):
  99                 raise NotImplementedError
 100
 101
 102         security.declareProtected(ModifyPortalContent, 'restore')
 103         def restore(self, key):
 104                 raise NotImplementedError
 105
 106 InitializeClass(ContentHistory)