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package middleware
import (
"cmp"
"context"
"math"
"net/http"
)
const defaultTheme = "dark"
func Theme(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var userTheme string
/* Grab the ‘theme’ cookie to figure out what the users current
theme is and add it to the context. If the user doesn’t yet
have a theme cookie or the cookie they have contains an
invalid theme then we fallback to the default theme and
(re)set the cookie. */
c, err := r.Cookie("theme")
if err == nil {
switch c.Value {
case "dark", "light":
userTheme = c.Value
}
}
theme := cmp.Or(userTheme, defaultTheme)
if userTheme == "" {
http.SetCookie(w, &http.Cookie{
Name: "theme",
Value: theme,
MaxAge: math.MaxInt32,
})
}
ctx := context.WithValue(r.Context(), "theme", theme)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
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