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- # frozen_string_literal: true
- class ActivityPub::Activity::Undo < ActivityPub::Activity
- def perform
- case @object['type']
- when 'Announce'
- undo_announce
- when 'Accept'
- undo_accept
- when 'Follow'
- undo_follow
- when 'Like'
- undo_like
- when 'Block'
- undo_block
- when nil
- handle_reference
- end
- end
- private
- def handle_reference
- # Some implementations do not inline the object, and as we don't have a
- # global index, we have to guess what object it is.
- return if object_uri.nil?
- try_undo_announce || try_undo_accept || try_undo_follow || try_undo_like || try_undo_block || delete_later!(object_uri)
- end
- def try_undo_announce
- status = Status.where.not(reblog_of_id: nil).find_by(uri: object_uri, account: @account)
- if status.present?
- RemoveStatusService.new.call(status)
- true
- else
- false
- end
- end
- def try_undo_accept
- # We can't currently handle `Undo Accept` as we don't record `Accept`'s uri
- false
- end
- def try_undo_follow
- follow = @account.follow_requests.find_by(uri: object_uri) || @account.active_relationships.find_by(uri: object_uri)
- if follow.present?
- follow.destroy
- true
- else
- false
- end
- end
- def try_undo_like
- # There is an index on accounts, but an account may have *many* favs, so this may be too costly
- false
- end
- def try_undo_block
- block = @account.block_relationships.find_by(uri: object_uri)
- if block.present?
- UnblockService.new.call(@account, block.target_account)
- true
- else
- false
- end
- end
- def undo_announce
- return if object_uri.nil?
- status = Status.find_by(uri: object_uri, account: @account)
- status ||= Status.find_by(uri: @object['atomUri'], account: @account) if @object.is_a?(Hash) && @object['atomUri'].present?
- if status.nil?
- delete_later!(object_uri)
- else
- RemoveStatusService.new.call(status)
- end
- end
- def undo_accept
- ::Follow.find_by(target_account: @account, uri: target_uri)&.revoke_request!
- end
- def undo_follow
- target_account = account_from_uri(target_uri)
- return if target_account.nil? || !target_account.local?
- if @account.following?(target_account)
- @account.unfollow!(target_account)
- elsif @account.requested?(target_account)
- FollowRequest.find_by(account: @account, target_account: target_account)&.destroy
- else
- delete_later!(object_uri)
- end
- end
- def undo_like
- status = status_from_uri(target_uri)
- return if status.nil? || !status.account.local?
- if @account.favourited?(status)
- favourite = status.favourites.where(account: @account).first
- favourite&.destroy
- else
- delete_later!(object_uri)
- end
- end
- def undo_block
- target_account = account_from_uri(target_uri)
- return if target_account.nil? || !target_account.local?
- if @account.blocking?(target_account)
- UnblockService.new.call(@account, target_account)
- else
- delete_later!(object_uri)
- end
- end
- def target_uri
- @target_uri ||= value_or_id(@object['object'])
- end
- end
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