def create_notification(obj, username, message, source_filter=None,
notification_type=NotificationType.ALERT):
"""
Generate a notification -- based on mongo obj.
:param obj: The object.
:type obj: class which inherits from
:class:`crits.core.crits_mongoengine.CritsBaseAttributes`
:param username: The user creating the notification.
:type username: str
:param message: The notification message.
:type message: str
:param source_filter: Filter on who can see this notification.
:type source_filter: list(str)
:param notification_type: The notification type (e.g. alert, error).
:type notification_type: str
"""
n = Notification()
n.analyst = username
obj_type = obj._meta['crits_type']
if notification_type not in NotificationType.ALL:
notification_type = NotificationType.ALERT
n.notification_type = notification_type
if obj_type == 'Comment':
n.obj_id = obj.obj_id
n.obj_type = obj.obj_type
n.notification = "%s added a comment: %s" % (username, obj.comment)
else:
n.notification = message
n.obj_id = obj.id
n.obj_type = obj_type
if hasattr(obj, 'source'):
sources = [s.name for s in obj.source]
if obj_type == 'Comment':
# for comments, use the sources from the object that it is linked to
# instead of the comments's sources
referenced_obj = class_from_id(n.obj_type, n.obj_id)
sources = [s.name for s in referenced_obj.source]
subscribed_users = get_subscribed_users(n.obj_type, n.obj_id, sources)
# Filter on users that have access to the source of the object
for subscribed_user in subscribed_users:
allowed_sources = user_sources(subscribed_user)
for allowed_source in allowed_sources:
if allowed_source in sources:
if source_filter is None or allowed_source in source_filter:
n.users.append(subscribed_user)
break
else:
n.users = get_subscribed_users(n.obj_type, n.obj_id, [])
if obj_type == 'Comment':
for u in obj.users:
if u not in n.users:
n.users.append(u)
# don't notify the user creating this notification
n.users = [u for u in n.users if u != username]
if not len(n.users):
return
try:
n.save()
except ValidationError:
pass
# Signal potentially waiting threads that notification information is available
for user in n.users:
notification_lock = NotificationLockManager.get_notification_lock(user)
notification_lock.acquire()
try:
notification_lock.notifyAll()
finally:
notification_lock.release()
