webdav: add minimal server implementation

fs_local.go

@@ -0,0 +1,32 @@
+package webdav
+
+import (
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+)
+
+type LocalFileSystem string
+
+func (fs LocalFileSystem) path(name string) (string, error) {
+	if (filepath.Separator != '/' && strings.IndexRune(name, filepath.Separator) >= 0) || strings.Contains(name, "\x00") {
+		return "", HTTPErrorf(http.StatusBadRequest, "webdav: invalid character in path")
+	}
+	name = path.Clean(name)
+	if !path.IsAbs(name) {
+		return "", HTTPErrorf(http.StatusBadRequest, "webdav: expected absolute path")
+	}
+	return filepath.Join(string(fs), filepath.FromSlash(name)), nil
+}
+
+func (fs LocalFileSystem) Open(name string) (File, error) {
+	p, err := fs.path(name)
+	if err != nil {
+		return nil, err
+	}
+	return os.Open(p)
+}
+
+var _ FileSystem = LocalFileSystem("")