discourse/app/controllers/highlight_js_controller.rb

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# frozen_string_literal: true
class HighlightJsController < ApplicationController
skip_before_action :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show]
before_action :apply_cdn_headers, only: [:show]
def show
no_cookies
RailsMultisite::ConnectionManagement.with_hostname(params[:hostname]) do
current_version = HighlightJs.version(SiteSetting.highlighted_languages)
if current_version != params[:version]
return redirect_to path(HighlightJs.path)
end
# note, this can be slightly optimised by caching the bundled file, it cuts down on N reads
# our nginx config caches this so in practical terms it does not really matter and keeps
# code simpler
languages = SiteSetting.highlighted_languages.split('|')
highlight_js = HighlightJs.bundle(languages)
response.headers["Last-Modified"] = 10.years.ago.httpdate
response.headers["Content-Length"] = highlight_js.bytesize.to_s
immutable_for 1.year
render plain: highlight_js, disposition: nil, content_type: 'application/javascript'
end
end
end