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48 lines
1.5 KiB
48 lines
1.5 KiB
# Remembers the campaign parameters a player arrived with, so the printed QR
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# codes can be told apart in the admin dashboard.
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#
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# The QR codes point at the bare domain, which redirects to /:locale and drops
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# the query string -- and the player row is not created until the language page
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# posts to game#start. The tags are therefore parked in the session on the way
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# in and read back out when the player is created.
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#
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# Matomo-style mtm_* parameters are accepted as aliases for the utm_* ones.
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#
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# Last touch wins: a second scan is a second visit, and the player row that
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# follows it belongs to the code that was actually scanned.
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module UtmTracking
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extend ActiveSupport::Concern
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SESSION_KEY = "utm".freeze
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included do
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before_action :capture_utm
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end
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private
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def capture_utm
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tags = Player::UTM_KEYS.index_with { |key|
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clean_utm(params[key].presence || params[key.to_s.sub("utm_", "mtm_")])
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}.compact
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return if tags.empty?
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# String keys: the session round-trips through the cookie, which has no
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# symbols, so `utm_attributes` would stop matching after the redirect.
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session[SESSION_KEY] = tags.transform_keys(&:to_s)
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end
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# Query parameters are typed by whoever holds the link, so they are trimmed
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# to something a column and a dashboard row can live with.
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def clean_utm(value)
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value.to_s.strip.first(100).presence
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end
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def utm_attributes
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(session[SESSION_KEY] || {}).slice(*Player::UTM_KEYS.map(&:to_s))
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end
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end
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