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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2014 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from mediagoblin.db.models import Activity, Generator, User
def create_activity(verb, obj, actor, target=None):
"""
This will create an Activity object which for the obj if possible
and save it. The verb should be one of the following:
add, author, create, delete, dislike, favorite, follow
like, post, share, unfollow, unfavorite, unlike, unshare,
update, tag.
If none of those fit you might not want/need to create an activity for
the object. The list is in mediagoblin.db.models.Activity.VALID_VERBS
"""
# exception when we try and generate an activity with an unknow verb
# could change later to allow arbitrary verbs but at the moment we'll play
# it safe.
if verb not in Activity.VALID_VERBS:
raise ValueError("A invalid verb type has been supplied.")
# This should exist as we're creating it by the migration for Generator
generator = Generator.query.filter_by(name="GNU MediaGoblin").first()
if generator is None:
generator = Generator(
name="GNU MediaGoblin",
object_type="service"
)
generator.save()
activity = Activity(verb=verb)
activity.set_object(obj)
if target is not None:
activity.set_target(target)
# If they've set it override the actor from the obj.
activity.actor = actor.id if isinstance(actor, User) else actor
activity.generator = generator.id
activity.save()
# Sigh want to do this prior to save but I can't figure a way to get
# around relationship() not looking up object when model isn't saved.
if activity.generate_content():
activity.save()
return activity
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