feat: some updates

server/internal/fsx/contenttype.go

@@ -6,6 +6,17 @@ import (
 	"strings"
 )
 
+var textPlainExtensions = map[string]bool{
+	".txt":  true,
+	".log":  true,
+	".json": true,
+	".yaml": true,
+	".yml":  true,
+	".toml": true,
+	".xml":  true,
+	".csv":  true,
+}
+
 func ContentTypeFor(name string) string {
 	ext := strings.ToLower(filepath.Ext(name))
 	switch ext {
@@ -15,8 +26,7 @@ func ContentTypeFor(name string) string {
 	if ct := mime.TypeByExtension(ext); ct != "" {
 		return ct
 	}
-	switch ext {
-	case ".txt", ".log", ".json", ".yaml", ".yml", ".toml", ".xml", ".csv":
+	if textPlainExtensions[ext] {
 		return "text/plain; charset=utf-8"
 	}
 	return "application/octet-stream"

server/internal/fsx/path.go

@@ -12,7 +12,7 @@ func CleanURLLike(p string) string {
 		return "/"
 	}
 	parts := []string{}
-	for _, seg := range strings.Split(strings.ReplaceAll(p, "\\", "/"), "/") {
+	for seg := range strings.SplitSeq(strings.ReplaceAll(p, "/", "/"), "/") {
 		switch seg {
 		case "", ".":
 			continue
@@ -29,8 +29,8 @@ func CleanURLLike(p string) string {
 
 func SafeRel(root, requested string) (string, error) {
 	s := CleanURLLike(requested)
-	if strings.HasPrefix(s, "/") {
-		s = strings.TrimPrefix(s, "/")
+	if after, ok := strings.CutPrefix(s, "/"); ok {
+		s = after
 	}
 	full := filepath.Join(root, filepath.FromSlash(s))
 	rel, err := filepath.Rel(root, full)