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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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