From 49766901293631aeabfc96e8d80aba305f420630 Mon Sep 17 00:00:00 2001
From: Anhgelus Morhtuuzh <william@herges.fr>
Date: Thu, 2 Oct 2025 18:36:06 +0200
Subject: feat(backend): config to set domain

---
 .gitignore        |  1 +
 backend/config.go | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 backend/data.go   | 10 +++++++++-
 backend/home.go   |  4 ++--
 backend/router.go |  9 ++++++++-
 go.mod            |  5 ++++-
 go.sum            |  2 ++
 main.go           | 10 ++++++++--
 8 files changed, 81 insertions(+), 8 deletions(-)

diff --git a/.gitignore b/.gitignore
index 5f15817..20abba6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -157,3 +157,4 @@ go.work.sum
 
 .idea
 public
+config.toml
diff --git a/backend/config.go b/backend/config.go
index b7624fd..98aeebe 100644
--- a/backend/config.go
+++ b/backend/config.go
@@ -1,3 +1,49 @@
 package backend
 
-type Config struct{}
+import (
+	"errors"
+	"log/slog"
+	"os"
+
+	"github.com/pelletier/go-toml/v2"
+)
+
+type Config struct {
+	Domain string `toml:"domain"`
+}
+
+func (c *Config) DefaultValues() {
+	c.Domain = "example.org"
+}
+
+func LoadConfig(path string) (*Config, bool) {
+	b, err := os.ReadFile(path)
+	var config Config
+	if err != nil {
+		if !errors.Is(err, os.ErrNotExist) {
+			slog.Error("reading config file", "error", err)
+			return nil, false
+		}
+		slog.Warn("config file not found", "path", path)
+		slog.Info("creating a new config file", "path", path)
+		config.DefaultValues()
+		b, err = toml.Marshal(&config)
+		if err != nil {
+			slog.Error("marshalling config file", "error", err)
+			return nil, false
+		}
+		err = os.WriteFile(path, b, 0660)
+		if err != nil {
+			slog.Error("writing config file", "error", err, "path", path)
+		} else {
+			slog.Info("config file created", "path", path)
+		}
+		return nil, false
+	}
+	err = toml.Unmarshal(b, &config)
+	if err != nil {
+		slog.Error("unmarshalling config file", "error", err)
+		return nil, false
+	}
+	return &config, true
+}
diff --git a/backend/data.go b/backend/data.go
index bc74ba5..3bc93d1 100644
--- a/backend/data.go
+++ b/backend/data.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"html/template"
 	"net/http"
+	"strings"
 )
 
 type data struct {
@@ -15,7 +16,14 @@ type data struct {
 	Description string
 }
 
-func (d *data) handleGeneric(w http.ResponseWriter, name string) {
+func (d *data) handleGeneric(w http.ResponseWriter, r *http.Request, name string) {
+	if d.Domain == "" {
+		cfg := r.Context().Value("config").(*Config)
+		d.Domain = cfg.Domain
+	}
+	if d.URL == "" {
+		d.URL = strings.TrimPrefix(r.URL.Path, "/")
+	}
 	t, err := template.New("").Funcs(template.FuncMap{
 		"static": func(path string) string {
 			return fmt.Sprintf("/static/%s", path)
diff --git a/backend/home.go b/backend/home.go
index a7f2ae1..83e04d9 100644
--- a/backend/home.go
+++ b/backend/home.go
@@ -7,7 +7,7 @@ import (
 )
 
 func HandleHome(r *chi.Mux) {
-	r.Get("/", func(w http.ResponseWriter, _ *http.Request) {
+	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
 		d := &data{
 			title:       "",
 			Article:     false,
@@ -16,6 +16,6 @@ func HandleHome(r *chi.Mux) {
 			Image:       "",
 			Description: "",
 		}
-		d.handleGeneric(w, "home")
+		d.handleGeneric(w, r, "home")
 	})
 }
diff --git a/backend/router.go b/backend/router.go
index 8ed63fa..374e28b 100644
--- a/backend/router.go
+++ b/backend/router.go
@@ -1,6 +1,7 @@
 package backend
 
 import (
+	"context"
 	"embed"
 	"io/fs"
 	"log/slog"
@@ -19,7 +20,7 @@ const Version = "0.1.0"
 //go:embed templates
 var templates embed.FS
 
-func NewRouter(debug bool) *chi.Mux {
+func NewRouter(debug bool, cfg *Config) *chi.Mux {
 	logFormat := httplog.SchemaECS.Concise(!debug)
 
 	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
@@ -49,6 +50,12 @@ func NewRouter(debug bool) *chi.Mux {
 		LogRequestHeaders:  []string{"Origin"},
 		LogResponseHeaders: []string{},
 	}))
+	r.Use(func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ctx := context.WithValue(r.Context(), "config", cfg)
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	})
 
 	return r
 }
diff --git a/go.mod b/go.mod
index 35e75ed..eb2f5fa 100644
--- a/go.mod
+++ b/go.mod
@@ -7,4 +7,7 @@ require (
 	github.com/joho/godotenv v1.5.1
 )
 
-require github.com/go-chi/httplog/v3 v3.2.2 // indirect
+require (
+	github.com/go-chi/httplog/v3 v3.2.2 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+)
diff --git a/go.sum b/go.sum
index abad55a..e8af854 100644
--- a/go.sum
+++ b/go.sum
@@ -4,3 +4,5 @@ github.com/go-chi/httplog/v3 v3.2.2 h1:G0oYv3YYcikNjijArHFUlqfR78cQNh9fGT43i6Stq
 github.com/go-chi/httplog/v3 v3.2.2/go.mod h1:N/J1l5l1fozUrqIVuT8Z/HzNeSy8TF2EFyokPLe6y2w=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/pelletier/go-toml/v2 v2.2.4 h1:mye9XuhQ6gvn5h28+VilKrrPoQVanw5PMw/TB0t5Ec4=
+github.com/pelletier/go-toml/v2 v2.2.4/go.mod h1:2gIqNv+qfxSVS7cM2xJQKtLSTLUE9V8t9Stt+h56mCY=
diff --git a/main.go b/main.go
index e1c13bb..abab2ea 100644
--- a/main.go
+++ b/main.go
@@ -56,7 +56,13 @@ func init() {
 func main() {
 	flag.Parse()
 
-	r := backend.NewRouter(dev)
+	cfg, ok := backend.LoadConfig(configFile)
+	if !ok {
+		slog.Info("exiting")
+		os.Exit(1)
+	}
+
+	r := backend.NewRouter(dev, cfg)
 
 	backend.HandleHome(r)
 
@@ -72,7 +78,7 @@ func main() {
 	sc := make(chan os.Signal, 1)
 	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
 
-	ok := true
+	ok = true
 	for ok {
 		select {
 		case err := <-errChan:
-- 
cgit v1.2.3