DEV: APIs for plugin to add custom reviewable confirm modal (#12246)

lib/discourse_plugin_registry.rb

@@ -84,6 +84,7 @@ class DiscoursePluginRegistry
   define_filtered_register :user_api_key_scope_mappings
 
   define_filtered_register :permitted_bulk_action_parameters
+  define_filtered_register :reviewable_params
 
   def self.register_auth_provider(auth_provider)
     self.auth_providers << auth_provider

lib/plugin/instance.rb

@@ -877,6 +877,13 @@ class Plugin::Instance
     DiscoursePluginRegistry.demon_processes << demon_class
   end
 
+  def add_permitted_reviewable_param(type, param)
+    DiscoursePluginRegistry.register_reviewable_param({
+      type: type,
+      param: param
+      }, self)
+  end
+
   protected
 
   def self.js_path

lib/reviewable/actions.rb

@@ -33,7 +33,7 @@ class Reviewable < ActiveRecord::Base
     end
 
     class Action < Item
-      attr_accessor :icon, :button_class, :label, :description, :confirm_message, :client_action, :require_reject_reason
+      attr_accessor :icon, :button_class, :label, :description, :confirm_message, :client_action, :require_reject_reason, :custom_modal
 
       def initialize(id, icon = nil, button_class = nil, label = nil)
         super(id)