~launchpad-pqm/launchpad/devel

# Copyright 2010 Canonical Ltd.  This software is licensed under the

# GNU Affero General Public License version 3 (see the file LICENSE).

__metaclass__ = type

__all__ = [

    'product_modified',

    ]

from zope.component import getUtility

from zope.security.proxy import removeSecurityProxy

from lp.translations.interfaces.translationimportqueue import (

    ITranslationImportQueue,

    )

def product_modified(product, event):

    """Update translations objects when the product changes."""

    old_owner = event.object_before_modification.owner

    if old_owner != product.owner:

        import_queue = getUtility(ITranslationImportQueue)

        # The change in ownership may cause permission issues for

        # entries in the translation import queue *if* the old owner has

        # less permission now. This issue can be avoided by updating the

        # entries's importer to the new owner. This can only be done if the

        # new owner does not already have an entry in the queue.

        # See bug 635438 for more details.

        old_owner_entries = []

        new_owner_entries = []

        for entry in import_queue.getAllEntries(target=product):

            if entry.importer == old_owner:

                old_owner_entries.append(entry)

            elif entry.importer == product.owner:

                new_owner_entries.append(entry)

            else:

                # The entry is not affected by the ownership change.

                pass

        if len(old_owner_entries) > 0 and len(new_owner_entries) == 0:

            # The new owner does not have any conflicting entries in the

            # queue. Change the old owner's entries to the new owner to

            # ensure there is no permissions issues during processing.

            for entry in old_owner_entries:

                removeSecurityProxy(entry).importer = product.owner