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# frozen_string_literal: true
class ActivityPub::ProcessCollectionService < BaseService
include JsonLdHelper
def call(body, actor, **options)
@account = actor
@json = original_json = Oj.load(body, mode: :strict)
@options = options
begin
@json = compact(@json) if @json['signature'].is_a?(Hash)
rescue JSON::LD::JsonLdError => e
Rails.logger.debug "Error when compacting JSON-LD document for #{value_or_id(@json['actor'])}: #{e.message}"
@json = original_json.without('signature')
end
return if !supported_context? || (different_actor? && verify_account!.nil?) || suspended_actor? || @account.local?
return unless @account.is_a?(Account)
if @json['signature'].present?
# We have verified the signature, but in the compaction step above, might
# have introduced incompatibilities with other servers that do not
# normalize the JSON-LD documents (for instance, previous Mastodon
# versions), so skip redistribution if we can't get a safe document.
patch_for_forwarding!(original_json, @json)
@json.delete('signature') unless safe_for_forwarding?(original_json, @json)
end
case @json['type']
when 'Collection', 'CollectionPage'
process_items @json['items']
when 'OrderedCollection', 'OrderedCollectionPage'
process_items @json['orderedItems']
else
process_items [@json]
end
rescue Oj::ParseError
nil
end
private
def different_actor?
@json['actor'].present? && value_or_id(@json['actor']) != @account.uri
end
def suspended_actor?
@account.suspended? && !activity_allowed_while_suspended?
end
def activity_allowed_while_suspended?
%w(Delete Reject Undo Update).include?(@json['type'])
end
def process_items(items)
items.reverse_each.filter_map { |item| process_item(item) }
end
def supported_context?
super(@json)
end
def process_item(item)
activity = ActivityPub::Activity.factory(item, @account, **@options)
activity&.perform
end
def verify_account!
@options[:relayed_through_actor] = @account
@account = ActivityPub::LinkedDataSignature.new(@json).verify_actor!
@account = nil unless @account.is_a?(Account)
@account
rescue JSON::LD::JsonLdError => e
Rails.logger.debug "Could not verify LD-Signature for #{value_or_id(@json['actor'])}: #{e.message}"
nil
end
end
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