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# frozen_string_literal: true
module ActivityPub
# Serializer for the `Activity` ActivityStreams model.
# Reference: https://www.w3.org/TR/activitystreams-core/#activities
class ActivitySerializer < ObjectSerializer
MissingActorError = Class.new(StandardError)
MissingObjectError = Class.new(StandardError)
IntransitiveWithObjectError = Class.new(StandardError)
private
def validate_response(serialized, opts)
response = super(serialized, opts)
unless response[:actor].present?
raise MissingActorError, "The serializer does not provide the mandatory 'actor' field."
end
if opts[:intransitive] && response[:object].present?
raise IntransitiveWithObjectError, <<~ERROR
The serializer does provide both the 'object' field and the :intransitive option.
Intransitive activities are meant precisely for when no object is available.
Please remove either of those.
See https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
ERROR
end
unless opts[:intransitive] || response[:object].present?
raise MissingObjectError, <<~ERROR
The serializer does not provide the mandatory 'object' field.
Pass the :intransitive option to #represent if this is an intransitive activity.
See https://www.w3.org/TR/activitystreams-vocabulary/#activity-types
ERROR
end
response
end
end
end
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