Gab Social. All are welcome.

app/lib/activitypub/activity/announce.rb

@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+class ActivityPub::Activity::Announce < ActivityPub::Activity
+  def perform
+    return reject_payload! if delete_arrived_first?(@json['id']) || !related_to_local_activity?
+
+    original_status = status_from_object
+
+    return reject_payload! if original_status.nil? || !announceable?(original_status)
+
+    status = Status.find_by(account: @account, reblog: original_status)
+
+    return status unless status.nil?
+
+    status = Status.create!(
+      account: @account,
+      reblog: original_status,
+      uri: @json['id'],
+      created_at: @json['published'],
+      override_timestamps: @options[:override_timestamps],
+      visibility: visibility_from_audience
+    )
+
+    distribute(status)
+    status
+  end
+
+  private
+
+  def visibility_from_audience
+    if equals_or_includes?(@json['to'], ActivityPub::TagManager::COLLECTIONS[:public])
+      :public
+    elsif equals_or_includes?(@json['cc'], ActivityPub::TagManager::COLLECTIONS[:public])
+      :unlisted
+    elsif equals_or_includes?(@json['to'], @account.followers_url)
+      :private
+    else
+      :direct
+    end
+  end
+
+  def announceable?(status)
+    status.account_id == @account.id || status.public_visibility? || status.unlisted_visibility?
+  end
+
+  def related_to_local_activity?
+    followed_by_local_accounts? || requested_through_relay? || reblog_of_local_status?
+  end
+
+  def requested_through_relay?
+    super || Relay.find_by(inbox_url: @account.inbox_url)&.enabled?
+  end
+
+  def reblog_of_local_status?
+    status_from_uri(object_uri)&.account&.local?
+  end
+end