package auth

import (
	"context"
	"net/http"
)

type ctxKey struct{}

func CallerMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user := r.Header.Get("X-Auth-Request-User")
		if user == "" {
			user = r.Header.Get("X-Forwarded-User")
		}
		ctx := context.WithValue(r.Context(), ctxKey{}, user)
		next.ServeHTTP(w, r.WithContext(ctx))
	})
}

func Caller(ctx context.Context) string {
	if v, ok := ctx.Value(ctxKey{}).(string); ok {
		return v
	}
	return ""
}