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# frozen_string_literal: true
class FollowService < BaseService
include StreamEntryRenderer
# Follow a remote user, notify remote user about the follow
# @param [Account] source_account From which to follow
# @param [String, Account] uri User URI to follow in the form of username@domain (or account record)
def call(source_account, uri)
target_account = uri.is_a?(Account) ? uri : ResolveRemoteAccountService.new.call(uri)
raise ActiveRecord::RecordNotFound if target_account.nil? || target_account.id == source_account.id || target_account.suspended?
raise Mastodon::NotPermittedError if target_account.blocking?(source_account) || source_account.blocking?(target_account)
return if source_account.following?(target_account) || source_account.requested?(target_account)
if target_account.locked? || target_account.activitypub?
request_follow(source_account, target_account)
else
direct_follow(source_account, target_account)
end
end
private
def request_follow(source_account, target_account)
follow_request = FollowRequest.create!(account: source_account, target_account: target_account)
if target_account.local?
NotifyService.new.call(target_account, follow_request)
elsif target_account.ostatus?
NotificationWorker.perform_async(build_follow_request_xml(follow_request), source_account.id, target_account.id)
AfterRemoteFollowRequestWorker.perform_async(follow_request.id)
elsif target_account.activitypub?
ActivityPub::DeliveryWorker.perform_async(build_json(follow_request), source_account.id, target_account.inbox_url)
end
follow_request
end
def direct_follow(source_account, target_account)
follow = source_account.follow!(target_account)
if target_account.local?
NotifyService.new.call(target_account, follow)
else
Pubsubhubbub::SubscribeWorker.perform_async(target_account.id) unless target_account.subscribed?
NotificationWorker.perform_async(build_follow_xml(follow), source_account.id, target_account.id)
AfterRemoteFollowWorker.perform_async(follow.id)
end
MergeWorker.perform_async(target_account.id, source_account.id)
follow
end
def redis
Redis.current
end
def build_follow_request_xml(follow_request)
OStatus::AtomSerializer.render(OStatus::AtomSerializer.new.follow_request_salmon(follow_request))
end
def build_follow_xml(follow)
OStatus::AtomSerializer.render(OStatus::AtomSerializer.new.follow_salmon(follow))
end
def build_json(follow_request)
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
follow_request,
serializer: ActivityPub::FollowSerializer,
adapter: ActivityPub::Adapter
).as_json).sign!(follow_request.account))
end
end
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