Set MIME types explicitly

Fixes #61
Fixes #70

webdata.go

@@ -1,19 +1,52 @@
+/*
+ *    Copyright (c) 2024 Unrud <unrud@outlook.com>
+ *
+ *    This file is part of Remote-Touchpad.
+ *
+ *    Remote-Touchpad is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    Remote-Touchpad is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with Remote-Touchpad.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package main
 
 import (
 	"embed"
 	"io/fs"
 	"log"
+	"mime"
 )
 
 //go:embed webdata/*
 var webdataFSWithPrefix embed.FS
 var webdataFS fs.FS
 
+var webdataTypes = map[string]string{
+	".css":  "text/css; charset=utf-8",
+	".html": "text/html; charset=utf-8",
+	".mjs":  "text/javascript; charset=utf-8",
+	".png":  "image/png",
+	".woff": "font/woff",
+}
+
 func init() {
 	var err error
 	webdataFS, err = fs.Sub(webdataFSWithPrefix, "webdata")
 	if err != nil {
 		log.Fatal(err)
 	}
+	for ext, typ := range webdataTypes {
+		if err := mime.AddExtensionType(ext, typ); err != nil {
+			log.Fatal(err)
+		}
+	}
 }