Federated social network node, running on kosmos.social https://kosmos.social
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# frozen_string_literal: true
class ActivityPub::SynchronizeFollowersService < BaseService
include JsonLdHelper
include Payloadable
def call(account, partial_collection_url)
@account = account
items = collection_items(partial_collection_url)
return if items.nil?
# There could be unresolved accounts (hence the call to .compact) but this
# should never happen in practice, since in almost all cases we keep an
# Account record, and should we not do that, we should have sent a Delete.
# In any case there is not much we can do if that occurs.
@expected_followers = items.filter_map { |uri| ActivityPub::TagManager.instance.uri_to_resource(uri, Account) }
remove_unexpected_local_followers!
handle_unexpected_outgoing_follows!
end
private
def remove_unexpected_local_followers!
@account.followers.local.where.not(id: @expected_followers.map(&:id)).each do |unexpected_follower|
UnfollowService.new.call(unexpected_follower, @account)
end
end
def handle_unexpected_outgoing_follows!
@expected_followers.each do |expected_follower|
next if expected_follower.following?(@account)
if expected_follower.requested?(@account)
# For some reason the follow request went through but we missed it
expected_follower.follow_requests.find_by(target_account: @account)&.authorize!
else
# Since we were not aware of the follow from our side, we do not have an
# ID for it that we can include in the Undo activity. For this reason,
# the Undo may not work with software that relies exclusively on
# matching activity IDs and not the actor and target
follow = Follow.new(account: expected_follower, target_account: @account)
ActivityPub::DeliveryWorker.perform_async(build_undo_follow_json(follow), follow.account_id, follow.target_account.inbox_url)
end
end
end
def build_undo_follow_json(follow)
Oj.dump(serialize_payload(follow, ActivityPub::UndoFollowSerializer))
end
def collection_items(collection_or_uri)
collection = fetch_collection(collection_or_uri)
return unless collection.is_a?(Hash)
collection = fetch_collection(collection['first']) if collection['first'].present?
return unless collection.is_a?(Hash)
case collection['type']
when 'Collection', 'CollectionPage'
collection['items']
when 'OrderedCollection', 'OrderedCollectionPage'
collection['orderedItems']
end
end
def fetch_collection(collection_or_uri)
return collection_or_uri if collection_or_uri.is_a?(Hash)
return if invalid_origin?(collection_or_uri)
fetch_resource_without_id_validation(collection_or_uri, nil, true)
end
end