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Viewing changes to src/zope/app/zopeappgenerations/evolve3.py

  • Committer: Sidnei da Silva
  • Date: 2010-07-05 21:07:01 UTC
  • Revision ID: sidnei.da.silva@canonical.com-20100705210701-zmqhqrbzad1mhzsl
- Reduce deps

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src/zope/app/zopeappgenerations/evolve3.py
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##############################################################################
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#
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# Copyright (c) 2004 Zope Corporation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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"""Evolve existing PAU group folders.
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They should be used as contained plugins rather than registered plugins.
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$Id: evolve3.py 85358 2008-04-14 20:30:57Z fdrake $
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"""
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__docformat__ = "reStructuredText"
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from zope import component
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from zope.app.component.interfaces import ISite
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from zope.app.zopeappgenerations import getRootFolder
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from zope.app.generations.utility import findObjectsProviding
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from zope.app.component import registration
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import zope.app.authentication.interfaces
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from zope.app.authentication import groupfolder
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from zope.copypastemove.interfaces import IObjectMover
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generation = 3
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def evolve(context):
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    """Evolve existing PAUs and group folders.
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    - Group folders should no longer be registered.
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    - PAUs that use group folders should use their contents name, not their
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      (formerly) registered name.
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    Group folders used by multiple PAUs were not supported, and are not
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    supported with this evolution.
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    """
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    root = getRootFolder(context)
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    for site in findObjectsProviding(root, ISite):
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        sm = site.getSiteManager()
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        for pau in findObjectsProviding(
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            sm, zope.app.authentication.interfaces.IPluggableAuthentication):
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            for nm, util in component.getUtilitiesFor(
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                zope.app.authentication.interfaces.IAuthenticatorPlugin,
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                context=pau):
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                if groupfolder.IGroupFolder.providedBy(util):
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                    if util.__parent__ is not pau:
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                        raise RuntimeError(
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                            "I don't know how to migrate your database: "
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                            "each group folder should only be within the "
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                            "Pluggable Authentication utility that uses it")
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                    # we need to remove this registration
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                    regs = registration.Registered(util).registrations()
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                    if len(regs) != 1:
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                        raise RuntimeError(
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                            "I don't know how to migrate your database: "
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                            "you should only have registered your group "
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                            "folder as an IAuthenticatorPlugin, but it looks "
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                            "like it's registered for something additional "
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                            "that I don't expect")
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                    r = regs[0]
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                    r.registry.unregisterUtility(
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                       util,
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                       zope.app.authentication.interfaces.IAuthenticatorPlugin,
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                       nm)
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                    if r.name in pau.authenticatorPlugins:
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                        if util.__name__ != r.name: # else no-op
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                            plugins = list(pau.authenticatorPlugins)
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                            if util.__name__ in pau.authenticatorPlugins:
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                                # argh! another active plugin's name is
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                                # the same as this group folder's
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                                # __name__.  That means we need to choose
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                                # a new name that is also not in
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                                # authenticatorPlugins and not in
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                                # pau.keys()...
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                                ct = 0
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                                nm = '%s_%d' % (util.__name__, ct)
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                                while (nm in pau.authenticatorPlugins or
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                                       nm in pau):
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                                    ct += 1
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                                    nm = '%s_%d' % (util.__name__, ct)
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                                IObjectMover(util).moveTo(pau, nm)
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                            plugins[plugins.index(r.name)] = util.__name__
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                            pau.authenticatorPlugins = tuple(plugins)
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            for k, r in pau.registrationManager.items():
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                if groupfolder.IGroupFolder.providedBy(r.component):
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                    del pau.registrationManager[k]
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