refactor: reusable fullFilename and personNameFromPath helpers

internal/web/ui.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"html/template"
 	"io"
+	"mime"
+	"mime/multipart"
 	"io/fs"
 	"net/http"
 	"net/url"
@@ -4110,3 +4112,26 @@ func (u *UI) rebuildFaceGallery() {
 	}
 	builder.Build()
 }
+
+// fullFilename extracts the full relative path from a webkitdirectory file upload,
+// bypassing Go 1.20+ sanitization that strips directory components.
+func fullFilename(hdr *multipart.FileHeader) string {
+	cd := hdr.Header.Get("Content-Disposition")
+	_, params, err := mime.ParseMediaType(cd)
+	if err == nil {
+		if name := params["filename"]; name != "" {
+			return name
+		}
+	}
+	return hdr.Filename
+}
+
+// personNameFromPath extracts the person name from a webkitdirectory path like "李清/photo.jpg".
+func personNameFromPath(path string) string {
+	path = strings.ReplaceAll(path, "\\", "/")
+	parts := strings.Split(path, "/")
+	if len(parts) < 2 {
+		return ""
+	}
+	return strings.TrimSpace(parts[len(parts)-2])
+}