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- # frozen_string_literal: true
- class ActivityPub::FetchRemoteKeyService < BaseService
- include JsonLdHelper
- # Returns account that owns the key
- def call(uri)
- return if uri.blank?
- @json = fetch_resource(uri, false)
- return unless supported_context?(@json) && expected_type?
- return find_account(@json['id'], @json) if person?
- @owner = fetch_resource(owner_uri, true)
- return unless supported_context?(@owner) && confirmed_owner?
- find_account(owner_uri, @owner)
- end
- private
- def find_account(uri, prefetched_body)
- account = ActivityPub::TagManager.instance.uri_to_resource(uri, Account)
- account ||= ActivityPub::FetchRemoteAccountService.new.call(uri, prefetched_body: prefetched_body)
- account
- end
- def expected_type?
- person? || public_key?
- end
- def person?
- equals_or_includes_any?(@json['type'], ActivityPub::FetchRemoteAccountService::SUPPORTED_TYPES)
- end
- def public_key?
- @json['publicKeyPem'].present? && @json['owner'].present?
- end
- def owner_uri
- @owner_uri ||= value_or_id(@json['owner'])
- end
- def confirmed_owner?
- equals_or_includes_any?(@owner['type'], ActivityPub::FetchRemoteAccountService::SUPPORTED_TYPES) && value_or_id(@owner['publicKey']) == @json['id']
- end
- end
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