Add searchability support

app/services/activitypub/process_account_service.rb

@@ -29,6 +29,7 @@ class ActivityPub::ProcessAccountService < BaseService
       @account          ||= Account.find_remote(@username, @domain)
       @old_public_key     = @account&.public_key
       @old_protocol       = @account&.protocol
+      @old_searchability  = @account&.searchability
       @suspension_changed = false
 
       if @account.nil?
@@ -112,6 +113,7 @@ class ActivityPub::ProcessAccountService < BaseService
     @account.fields                  = property_values || {}
     @account.also_known_as           = as_array(@json['alsoKnownAs'] || []).map { |item| value_or_id(item) }
     @account.discoverable            = @json['discoverable'] || false
+    @account.searchability           = searchability_from_audience
   end
 
   def set_fetchable_key!
@@ -150,6 +152,10 @@ class ActivityPub::ProcessAccountService < BaseService
     end
   end
 
+  def after_searchability_change!
+    SearchabilityUpdateWorker.perform_async(@account.id) if @account.statuses.unset_searchability.exists?
+  end
+
   def after_protocol_change!
     ActivityPub::PostUpgradeWorker.perform_async(@account.domain)
   end
@@ -224,6 +230,24 @@ class ActivityPub::ProcessAccountService < BaseService
     end
   end
 
+  def audience_searchable_by
+    return nil if @json['searchableBy'].nil?
+
+    @audience_searchable_by = as_array(@json['searchableBy']).map { |x| value_or_id(x) }
+  end
+
+  def searchability_from_audience
+    if audience_searchable_by.nil?
+      :direct
+    elsif audience_searchable_by.any? { |uri| ActivityPub::TagManager.instance.public_collection?(uri) }
+      :public
+    elsif audience_searchable_by.include?(@account.followers_url)
+      :private
+    else
+      :direct
+    end
+  end
+
   def property_values
     return unless @json['attachment'].is_a?(Array)
 
@@ -310,6 +334,10 @@ class ActivityPub::ProcessAccountService < BaseService
     !@old_protocol.nil? && @old_protocol != @account.protocol
   end
 
+  def searchability_changed?
+    !@old_searchability.nil? && @old_searchability != @account.searchability
+  end
+
   def process_tags
     return if @json['tag'].blank?