add url parsing to lua

pkg/actions/lua/net/url/url.go

@@ -0,0 +1,36 @@
+package url
+
+import (
+	neturl "net/url"
+
+	"github.com/Shopify/go-lua"
+	"github.com/treeverse/lakefs/pkg/actions/lua/util"
+)
+
+func Open(l *lua.State) {
+	open := func(l *lua.State) int {
+		lua.NewLibrary(l, library)
+		return 1
+	}
+	lua.Require(l, "net/url", open, false)
+	l.Pop(1)
+}
+
+var library = []lua.RegistryFunction{
+	{Name: "parse", Function: Parse},
+}
+
+func Parse(l *lua.State) int {
+	rawURL := lua.CheckString(l, 1)
+	u, err := neturl.Parse(rawURL)
+	if err != nil {
+		lua.Errorf(l, err.Error())
+		panic("unreachable")
+	}
+	return util.DeepPush(l, map[string]string{
+		"host":   u.Host,
+		"path":   u.Path,
+		"scheme": u.Scheme,
+		"query":  u.RawQuery,
+	})
+}