rails--rails/railties/lib/rails/info_controller.rb

require 'rails/application_controller'
require 'action_dispatch/routing/inspector'

class Rails::InfoController < Rails::ApplicationController # :nodoc:
  prepend_view_path ActionDispatch::DebugExceptions::RESCUES_TEMPLATE_PATH
  layout -> { request.xhr? ? false : 'application' }

  before_action :require_local!

  def index
    redirect_to action: :routes
  end

  def properties
    @info = Rails::Info.to_html
    @page_title = 'Properties'
  end

  def routes
    if path = params[:path]
      path = URI.parser.escape path
      normalized_path = with_leading_slash path
      render json: {
        exact: match_route {|it| it.match normalized_path },
        fuzzy: match_route {|it| it.spec.to_s.match path }
      }
    else
      @routes_inspector = ActionDispatch::Routing::RoutesInspector.new(_routes.routes)
      @page_title = 'Routes'
    end
  end

  private

  def match_route
    _routes.routes.select {|route|
      yield route.path
    }.map {|route| route.path.spec.to_s }
  end

  def with_leading_slash(path)
    ('/' + path).squeeze('/')
  end
end