init.rb

require 'redmine'

if Rails::VERSION::MAJOR < 3
  require 'dispatcher'
  object_to_prepare = Dispatcher
else
  object_to_prepare = Rails.configuration
  # if redmine plugins were railties:
  # object_to_prepare = config
end

object_to_prepare.to_prepare do
  ApplicationController.send(:include, RedmineCors::Patches::ApplicationController)
end

Redmine::Plugin.register :redmine_cors do
  name 'Redmine CORS'
  author 'Marco Vito Moscaritolo'
  description 'This is a plugin for Redmine that make possible CORS request.'
  url 'http://github.com/mavimo/redmine_cors'
  author_url 'http://mavimo.org/'

  version '0.0.1'
  requires_redmine :version_or_higher => '2.0.0'

  settings :partial => 'settings/cors_settings',
    :default => {
      "cors_domain" => "",
      "cors_headers" => "X-Requested-With, X-Prototype-Version, Content-Type, X-Redmine-API-Key, accept, authorization",
      "cors_methods" => "POST, GET, OPTIONS, PUT",
      "cors_maxage" => "1728000",
      "cors_credentials" => '1'
    }
end