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package internal
import (
"expvar"
"net/http"
"net/url"
"tailscale.com/metrics"
)
var (
referers = &metrics.LabelMap{Label: "referer"}
)
func init() {
expvar.Publish("gauge_xesite_referer", referers)
}
func RefererMiddleware(next http.Handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if referer := r.Header.Get("Referer"); referer != "" {
_, err := url.Parse(referer)
if err == nil {
referers.Add(referer, 1)
}
}
next.ServeHTTP(w, r)
}
}
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