discourse/app/controllers/permalinks_controller.rb

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class PermalinksController < ApplicationController
skip_before_action :check_xhr, :preload_json
def show
url = request.fullpath
permalink = Permalink.find_by_url(url)
raise Discourse::NotFound unless permalink
if permalink.external_url
redirect_to permalink.external_url, status: :moved_permanently
elsif permalink.target_url
redirect_to permalink.target_url, status: :moved_permanently
else
raise Discourse::NotFound
end
end
end