discourse/app/controllers/onebox_controller.rb

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require_dependency 'oneboxer'
class OneboxController < ApplicationController
before_filter :ensure_logged_in
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def show
params.require(:user_id)
unless params[:refresh] == 'true'
preview = Oneboxer.cached_preview(params[:url])
preview.strip! if preview.present?
return render(plain: preview) if preview.present?
end
# only 1 outgoing preview per user
return render(nothing: true, status: 429) if Oneboxer.is_previewing?(params[:user_id])
Oneboxer.preview_onebox!(params[:user_id])
preview = Oneboxer.preview(params[:url], invalidate_oneboxes: params[:refresh] == 'true')
preview.strip! if preview.present?
Scheduler::Defer.later("Onebox previewed") {
Oneboxer.onebox_previewed!(params[:user_id])
}
if preview.blank?
render nothing: true, status: 404
else
render plain: preview
end
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end
end