Download templates on boot

internal/conf/conf.go

@@ -1,13 +1,52 @@
 package conf
 
 import (
+	"errors"
+	"io"
 	"log"
+	"net/http"
 	"os"
+	"path/filepath"
 
 	"github.com/pelletier/go-toml/v2"
 )
 
+type Asset struct {
+	Path string
+	Url  string
+}
+
+func (asset *Asset) FetchIfNotExists(staticPath string) {
+	destPath := filepath.Join(staticPath, asset.Path)
+
+	out, err := os.OpenFile(
+		destPath,
+		os.O_WRONLY|os.O_CREATE|os.O_EXCL,
+		0666,
+	)
+	if err != nil {
+		if errors.Is(err, os.ErrExist) {
+			log.Printf("%s already exists\n", destPath)
+			return
+		}
+		panic(err)
+	}
+	defer out.Close()
+
+	resp, err := http.Get(asset.Url)
+	if err != nil {
+		panic(err)
+	}
+	defer resp.Body.Close()
+
+	_, err = io.Copy(out, resp.Body)
+	if err != nil {
+		panic(err)
+	}
+}
+
 type Config struct {
+	Port      int
 	Extension string
 	NotesDir  string
 	Templates struct {
@@ -15,8 +54,9 @@ type Config struct {
 		Base string
 	}
 	Static struct {
-		Dir  string
-		Root string
+		Dir    string
+		Root   string
+		Assets []Asset
 	}
 }
 
@@ -34,4 +74,8 @@ func LoadConfig(path string) {
 	if err != nil {
 		log.Fatal(err)
 	}
+
+	for _, asset := range Conf.Static.Assets {
+		asset.FetchIfNotExists(Conf.Static.Dir)
+	}
 }