From c482a75dbf1c49920ec9ab0d1f54e82c2e05a12f Mon Sep 17 00:00:00 2001
From: hhhjort <31041505+hhhjort@users.noreply.github.com>
Date: Fri, 25 Oct 2024 16:03:22 -0400
Subject: [PATCH] ORTB 2.6: Adds a Regs clone (#4012)

---
 exchange/utils.go  |  1 +
 ortb/clone.go      | 16 ++++++++++++++++
 ortb/clone_test.go | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)

diff --git a/exchange/utils.go b/exchange/utils.go
index 4f4e2a53f41..5e3feab15f5 100644
--- a/exchange/utils.go
+++ b/exchange/utils.go
@@ -220,6 +220,7 @@ func (rs *requestSplitter) cleanOpenRTBRequests(ctx context.Context,
 		// down convert
 		info, ok := rs.bidderInfo[bidder]
 		if !ok || info.OpenRTB == nil || info.OpenRTB.Version != "2.6" {
+			reqWrapperCopy.Regs = ortb.CloneRegs(reqWrapperCopy.Regs)
 			if err := openrtb_ext.ConvertDownTo25(reqWrapperCopy); err != nil {
 				errs = append(errs, err)
 				continue
diff --git a/ortb/clone.go b/ortb/clone.go
index 1e34795e05a..ff2d16560b8 100644
--- a/ortb/clone.go
+++ b/ortb/clone.go
@@ -277,3 +277,19 @@ func CloneBidRequestPartial(s *openrtb2.BidRequest) *openrtb2.BidRequest {
 
 	return &c
 }
+
+func CloneRegs(s *openrtb2.Regs) *openrtb2.Regs {
+	if s == nil {
+		return nil
+	}
+
+	// Shallow Copy (Value Fields)
+	c := *s
+
+	// Deep Copy (Pointers)
+	c.GDPR = ptrutil.Clone(s.GDPR)
+	c.GPPSID = slices.Clone(s.GPPSID)
+	c.Ext = slices.Clone(s.Ext)
+
+	return &c
+}
diff --git a/ortb/clone_test.go b/ortb/clone_test.go
index 21c19f170c6..096f78d51b2 100644
--- a/ortb/clone_test.go
+++ b/ortb/clone_test.go
@@ -759,3 +759,44 @@ func discoverPointerFields(t reflect.Type) []string {
 	}
 	return fields
 }
+
+func TestCloneRegs(t *testing.T) {
+	t.Run("nil", func(t *testing.T) {
+		result := CloneRegs(nil)
+		assert.Nil(t, result)
+	})
+
+	t.Run("empty", func(t *testing.T) {
+		given := &openrtb2.Regs{}
+		result := CloneRegs(given)
+		assert.Empty(t, result)
+		assert.NotSame(t, given, result)
+	})
+
+	t.Run("populated", func(t *testing.T) {
+		given := &openrtb2.Regs{
+			COPPA:     1,
+			GDPR:      ptrutil.ToPtr(int8(0)),
+			USPrivacy: "1YNN",
+			GPP:       "SomeGPPStrig",
+			GPPSID:    []int8{1, 2, 3},
+			Ext:       json.RawMessage(`{"anyField":1}`),
+		}
+		result := CloneRegs(given)
+		assert.Equal(t, given, result, "equality")
+		assert.NotSame(t, given, result, "pointer")
+		assert.NotSame(t, given.GDPR, result.GDPR, "gdpr")
+		assert.NotSame(t, given.GPPSID, result.GPPSID, "gppsid[]")
+		assert.NotSame(t, given.GPPSID[0], result.GPPSID[0], "gppsid[0]")
+		assert.NotSame(t, given.Ext, result.Ext, "ext")
+	})
+
+	t.Run("assumptions", func(t *testing.T) {
+		assert.ElementsMatch(t, discoverPointerFields(reflect.TypeOf(openrtb2.Regs{})),
+			[]string{
+				"GDPR",
+				"GPPSID",
+				"Ext",
+			})
+	})
+}