From 85ab8ea0234dc3a6e6fd11092da3ee72f25365a6 Mon Sep 17 00:00:00 2001
From: wln <732437837@qq.com>
Date: Wed, 10 Apr 2024 09:10:41 +0800
Subject: [PATCH] fix: #3465 If the value of a string is null, the value of
 string is nil after the string is converted to []string

---
 ...ghttp_z_unit_feature_router_strict_test.go | 50 +++++++++++++++++++
 util/gconv/gconv_slice_str.go                 | 17 ++++++-
 util/gconv/gconv_z_unit_slice_test.go         |  6 +++
 3 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/net/ghttp/ghttp_z_unit_feature_router_strict_test.go b/net/ghttp/ghttp_z_unit_feature_router_strict_test.go
index 923c3ab2cb4..fba43a89488 100644
--- a/net/ghttp/ghttp_z_unit_feature_router_strict_test.go
+++ b/net/ghttp/ghttp_z_unit_feature_router_strict_test.go
@@ -485,3 +485,53 @@ func Test_JsonRawMessage_Issue3449(t *testing.T) {
 
 	})
 }
+
+type testNullStringIssue3465Req struct {
+	g.Meta `path:"/test" method:"get" sm:"hello" tags:"示例"`
+	Name   []string `json:"name" v:"required"`
+}
+type testNullStringIssue3465Res struct {
+	Name []string `json:"name" v:"required" `
+}
+
+type testNullStringIssue3465 struct {
+}
+
+func (t *testNullStringIssue3465) Test(ctx context.Context, req *testNullStringIssue3465Req) (res *testNullStringIssue3465Res, err error) {
+	return &testNullStringIssue3465Res{
+		Name: req.Name,
+	}, nil
+}
+
+// https://github.com/gogf/gf/issues/3465
+func Test_NullString_Issue3465(t *testing.T) {
+
+	s := g.Server(guid.S())
+	s.Use(ghttp.MiddlewareHandlerResponse)
+	s.Group("/", func(group *ghttp.RouterGroup) {
+		group.Bind(new(testNullStringIssue3465))
+	})
+	s.SetDumpRouterMap(false)
+	s.Start()
+	defer s.Shutdown()
+
+	time.Sleep(100 * time.Millisecond)
+	gtest.C(t, func(t *gtest.T) {
+		client := g.Client()
+		client.SetPrefix(fmt.Sprintf("http://127.0.0.1:%d", s.GetListenedPort()))
+
+		data1 := map[string]any{
+			"name": "null",
+		}
+
+		expect1 := `{"code":0,"message":"","data":{"name":["null"]}}`
+		t.Assert(client.GetContent(ctx, "/test", data1), expect1)
+
+		data2 := map[string]any{
+			"name": []string{"null", "null"},
+		}
+		expect2 := `{"code":0,"message":"","data":{"name":["null","null"]}}`
+		t.Assert(client.GetContent(ctx, "/test", data2), expect2)
+
+	})
+}
diff --git a/util/gconv/gconv_slice_str.go b/util/gconv/gconv_slice_str.go
index c085d271fbc..8c97c0157d3 100644
--- a/util/gconv/gconv_slice_str.go
+++ b/util/gconv/gconv_slice_str.go
@@ -60,11 +60,26 @@ func Strings(any interface{}) []string {
 	case []uint8:
 		if json.Valid(value) {
 			_ = json.UnmarshalUseNumber(value, &array)
-		} else {
+		}
+		if array == nil {
 			array = make([]string, len(value))
 			for k, v := range value {
 				array[k] = String(v)
 			}
+			return array
+		}
+	case string:
+		byteValue := []byte(value)
+		if json.Valid(byteValue) {
+			_ = json.UnmarshalUseNumber(byteValue, &array)
+		}
+		if array == nil {
+			if value == "" {
+				return []string{}
+			}
+			// Prevent strings from being null
+			// See Issue 3465 for details
+			return []string{value}
 		}
 	case []uint16:
 		array = make([]string, len(value))
diff --git a/util/gconv/gconv_z_unit_slice_test.go b/util/gconv/gconv_z_unit_slice_test.go
index d17d017599b..4103ec18396 100644
--- a/util/gconv/gconv_z_unit_slice_test.go
+++ b/util/gconv/gconv_z_unit_slice_test.go
@@ -321,6 +321,12 @@ func Test_Strings(t *testing.T) {
 	gtest.C(t, func(t *gtest.T) {
 		t.AssertEQ(gconv.Strings("123"), []string{"123"})
 	})
+	// https://github.com/gogf/gf/issues/3465
+	gtest.C(t, func(t *gtest.T) {
+		t.AssertEQ(gconv.Strings("null"), []string{"null"})
+		t.AssertEQ(gconv.Strings([]byte("null")), []string{"110", "117", "108", "108"})
+		t.AssertEQ(gconv.Strings("{\"name\":\"wln\"}"), []string{"{\"name\":\"wln\"}"})
+	})
 }
 
 func Test_Slice_Interfaces(t *testing.T) {