From 28a0d68c0573d2d056bd66a195de21b692f34730 Mon Sep 17 00:00:00 2001
From: Evgeniy Stratonikov <evgeniy@nspcc.ru>
Date: Tue, 11 May 2021 12:35:28 +0300
Subject: [PATCH] jsonpath: allow empty paths

---
 pkg/services/oracle/jsonpath/jsonpath.go      | 4 ++++
 pkg/services/oracle/jsonpath/jsonpath_test.go | 1 +
 2 files changed, 5 insertions(+)

diff --git a/pkg/services/oracle/jsonpath/jsonpath.go b/pkg/services/oracle/jsonpath/jsonpath.go
index 105776d12..5672572a4 100644
--- a/pkg/services/oracle/jsonpath/jsonpath.go
+++ b/pkg/services/oracle/jsonpath/jsonpath.go
@@ -38,6 +38,10 @@ const maxNestingDepth = 6
 // Get returns substructures of value selected by path.
 // The result is always non-nil unless path is invalid.
 func Get(path string, value interface{}) ([]interface{}, bool) {
+	if path == "" {
+		return []interface{}{value}, true
+	}
+
 	p := pathParser{
 		depth: maxNestingDepth,
 		s:     path,
diff --git a/pkg/services/oracle/jsonpath/jsonpath_test.go b/pkg/services/oracle/jsonpath/jsonpath_test.go
index cd9f40ae9..7bffbcd6b 100644
--- a/pkg/services/oracle/jsonpath/jsonpath_test.go
+++ b/pkg/services/oracle/jsonpath/jsonpath_test.go
@@ -264,6 +264,7 @@ func TestCSharpCompat(t *testing.T) {
 		{"$..book[1:2]", `[{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99}]`},
 		{"$..book[-2:]", `[{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]`},
 		{"$..book[2:]", `[{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]`},
+		{"", `[{"store":{"book":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],"bicycle":{"color":"red","price":19.95}},"expensive":10}]`},
 		{"$.*", `[{"book":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}],"bicycle":{"color":"red","price":19.95}},10]`},
 		{"$..invalidfield", `[]`},
 	}