rename route /javascripts to /theme-javascripts (#6495)

app/controllers/theme_javascripts_controller.rb

@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+class ThemeJavascriptsController < ApplicationController
+  DISK_CACHE_PATH = "#{Rails.root}/tmp/javascript-cache"
+
+  skip_before_action(
+    :check_xhr,
+    :handle_theme,
+    :preload_json,
+    :redirect_to_login_if_required,
+    :verify_authenticity_token,
+    only: [:show]
+  )
+
+  before_action :is_asset_path, :no_cookies, only: [:show]
+
+  def show
+    raise Discourse::NotFound unless last_modified.present?
+    return render body: nil, status: 304 if not_modified?
+
+    # Security: safe due to route constraint
+    cache_file = "#{DISK_CACHE_PATH}/#{params[:digest]}.js"
+
+    unless File.exist?(cache_file)
+      content = query.pluck(:content).first
+      raise Discourse::NotFound if content.nil?
+
+      FileUtils.mkdir_p(DISK_CACHE_PATH)
+      File.write(cache_file, content)
+    end
+
+    set_cache_control_headers
+    send_file(cache_file, disposition: :inline)
+  end
+
+  private
+
+  def query
+    @query ||= JavascriptCache.where(digest: params[:digest]).limit(1)
+  end
+
+  def last_modified
+    @last_modified ||= query.pluck(:updated_at).first
+  end
+
+  def not_modified?
+    cache_time =
+      begin
+        Time.rfc2822(request.env["HTTP_IF_MODIFIED_SINCE"])
+      rescue ArgumentError
+        nil
+      end
+
+    cache_time && last_modified && last_modified <= cache_time
+  end
+
+  def set_cache_control_headers
+    if Rails.env.development?
+      response.headers['Last-Modified'] = Time.zone.now.httpdate
+      immutable_for(1.second)
+    else
+      response.headers['Last-Modified'] = last_modified.httpdate if last_modified
+      immutable_for(1.year)
+    end
+  end
+end