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