discourse/app/controllers/onebox_controller.rb

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require_dependency 'oneboxer'
class OneboxController < ApplicationController
before_action :ensure_logged_in
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def show
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(body: nil, status: 429) if Oneboxer.is_previewing?(current_user.id)
user_id = current_user.id
invalidate = params[:refresh] == 'true'
url = params[:url]
hijack do
Oneboxer.preview_onebox!(user_id)
preview = Oneboxer.preview(url, invalidate_oneboxes: invalidate)
preview.strip! if preview.present?
Oneboxer.onebox_previewed!(user_id)
if preview.blank?
render body: nil, status: 404
else
render plain: preview
end
end
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end
end