From d218bee6b8ab4fd10bec88269270a2412bdbbb46 Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Sun, 6 Apr 2025 14:56:19 +0200
Subject: refactor: make domain configurable

---
 lexsurf.go | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

(limited to 'lexsurf.go')

diff --git a/lexsurf.go b/lexsurf.go
index 9ac8feb..5c1e15a 100644
--- a/lexsurf.go
+++ b/lexsurf.go
@@ -6,12 +6,18 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"os"
 	"strings"
 	"text/template"
 )
 
 func main() {
-	var handler = handler{lawsByCC: map[string]map[string]law{}}
+	domain := os.Getenv("DOMAIN")
+	if domain == "" {
+		log.Fatal("DOMAIN environment variable must be set")
+	}
+
+	var handler = handler{domain: domain, lawsByCC: map[string]map[string]law{}}
 	text, _ := ioutil.ReadFile("countries.json")
 	err := json.Unmarshal(text, &handler.countries)
 	if err != nil {
@@ -50,12 +56,13 @@ var tpl, _ = template.New("").Funcs(template.FuncMap{
 }).ParseGlob("views/*")
 
 type handler struct {
+	domain    string
 	countries map[string]country
 	lawsByCC  map[string]map[string]law
 }
 
 func (h *handler) handle(w http.ResponseWriter, r *http.Request) {
-	if r.Host == "lex.surf" || r.Host == "lex.localhost" {
+	if r.Host == h.domain {
 		if r.URL.Path != "/" {
 			w.WriteHeader(http.StatusNotFound)
 			w.Write([]byte("page not found"))
@@ -71,13 +78,11 @@ func (h *handler) handle(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	parts := strings.SplitN(r.Host, ".", 2)
-	if len(parts) != 2 {
+	cc, isSubdomain := strings.CutSuffix(r.Host, "."+h.domain)
+	if !isSubdomain {
 		w.Write([]byte("unknown host"))
 		return
 	}
-	cc := parts[0]
-	host := parts[1]
 	key := strings.TrimLeft(r.URL.Path, "/")
 	if len(key) > 0 {
 		val, ok := h.lawsByCC[cc][key]
@@ -106,7 +111,7 @@ func (h *handler) handle(w http.ResponseWriter, r *http.Request) {
 		_, hasJSONLaws := h.lawsByCC[cc]
 		err := tpl.ExecuteTemplate(w, "search.html", map[string]any{
 			"TLD":         cc,
-			"Domain":      host,
+			"Domain":      h.domain,
 			"Country":     h.countries[cc],
 			"HasJSONLaws": hasJSONLaws,
 		})
-- 
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