1 files changed, 36 insertions, 0 deletions
diff --git a/app/services/activitypub/fetch_remote_status_service.rb b/app/services/activitypub/fetch_remote_status_service.rb
new file mode 100644
index 000000000..80305c53d
--- /dev/null
+++ b/app/services/activitypub/fetch_remote_status_service.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class ActivityPub::FetchRemoteStatusService < BaseService
+  include JsonLdHelper
+
+  # Should be called when uri has already been checked for locality
+  def call(uri)
+    @json = fetch_resource(uri)
+
+    return unless supported_context? && expected_type?
+
+    attributed_to = first_of_value(@json['attributedTo'])
+    attributed_to = attributed_to['id'] if attributed_to.is_a?(Hash)
+
+    return unless trustworthy_attribution?(uri, attributed_to)
+
+    actor = ActivityPub::TagManager.instance.uri_to_resource(attributed_to, Account)
+    actor = ActivityPub::FetchRemoteAccountService.new.call(attributed_to) if actor.nil?
+
+    ActivityPub::Activity::Create.new({ 'object' => @json }, actor).perform
+  end
+
+  private
+
+  def trustworthy_attribution?(uri, attributed_to)
+    Addressable::URI.parse(uri).normalized_host.casecmp(Addressable::URI.parse(attributed_to).normalized_host).zero?
+  end
+
+  def supported_context?
+    super(@json)
+  end
+
+  def expected_type?
+    %w(Note Article).include? @json['type']
+  end
+end