feat: v2 (#599)

Read https://github.com/filebrowser/filebrowser/pull/575.

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Former-commit-id: e032e0804dd051df86f42962de2b39caec5318b7

fileutils/copy.go

@@ -0,0 +1,39 @@
+package fileutils
+
+import (
+	"os"
+	"path"
+
+	"github.com/spf13/afero"
+)
+
+// Copy copies a file or folder from one place to another.
+func Copy(fs afero.Fs, src, dst string) error {
+	if src = path.Clean("/" + src); src == "" {
+		return os.ErrNotExist
+	}
+
+	if dst = path.Clean("/" + dst); dst == "" {
+		return os.ErrNotExist
+	}
+
+	if src == "/" || dst == "/" {
+		// Prohibit copying from or to the virtual root directory.
+		return os.ErrInvalid
+	}
+
+	if dst == src {
+		return os.ErrInvalid
+	}
+
+	info, err := fs.Stat(src)
+	if err != nil {
+		return err
+	}
+
+	if info.IsDir() {
+		return CopyDir(fs, src, dst)
+	}
+
+	return CopyFile(fs, src, dst)
+}