feat(v3): add GraftConfigTreeNode to materialize anonymous config tree nodes

core/v3/graft.go

@@ -0,0 +1,47 @@
+package v3
+
+import (
+	"github.com/0xsequence/ethkit/go-ethereum/common"
+)
+
+// GraftConfigTreeNode returns tree with the first anonymous node-hash leaf
+// whose image hash equals replacement.ImageHash() swapped for replacement,
+// leaving the tree's image hash unchanged. ok reports whether the hash was
+// found, either as a node leaf (replaced) or already as a full subtree
+// (returned unchanged).
+func GraftConfigTreeNode(tree WalletConfigTree, replacement WalletConfigTree) (grafted WalletConfigTree, ok bool) {
+	if tree == nil || replacement == nil {
+		return tree, false
+	}
+	return graftConfigTreeNode(tree, replacement, replacement.ImageHash().Hash)
+}
+
+func graftConfigTreeNode(tree WalletConfigTree, replacement WalletConfigTree, hash common.Hash) (WalletConfigTree, bool) {
+	if tree == nil {
+		return tree, false
+	}
+
+	if tree.ImageHash().Hash == hash {
+		switch tree.(type) {
+		case WalletConfigTreeNodeLeaf, *WalletConfigTreeNodeLeaf:
+			return replacement, true
+		}
+		return tree, true
+	}
+
+	switch n := tree.(type) {
+	case *WalletConfigTreeNode:
+		if left, ok := graftConfigTreeNode(n.Left, replacement, hash); ok {
+			return &WalletConfigTreeNode{Left: left, Right: n.Right}, true
+		}
+		if right, ok := graftConfigTreeNode(n.Right, replacement, hash); ok {
+			return &WalletConfigTreeNode{Left: n.Left, Right: right}, true
+		}
+	case *WalletConfigTreeNestedLeaf:
+		if inner, ok := graftConfigTreeNode(n.Tree, replacement, hash); ok {
+			return &WalletConfigTreeNestedLeaf{Weight: n.Weight, Threshold: n.Threshold, Tree: inner}, true
+		}
+	}
+
+	return tree, false
+}

core/v3/graft_test.go

@@ -0,0 +1,131 @@
+package v3_test
+
+import (
+	"testing"
+
+	"github.com/0xsequence/ethkit/go-ethereum/common"
+	"github.com/0xsequence/go-sequence/core"
+	v3 "github.com/0xsequence/go-sequence/core/v3"
+	"github.com/stretchr/testify/require"
+)
+
+func graftTestSapientLeaf() *v3.WalletConfigTreeSapientSignerLeaf {
+	return &v3.WalletConfigTreeSapientSignerLeaf{
+		Weight:     1,
+		Address:    common.HexToAddress("0x9999999999999999999999999999999999999999"),
+		ImageHash_: core.ImageHash{Hash: common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000042")},
+	}
+}
+
+// anonymousNodeLeaf mimics a decoded node-hash leaf: hash only, no preimage.
+func anonymousNodeLeaf(subtree v3.WalletConfigTree) core.ImageHash {
+	return core.ImageHash{Hash: subtree.ImageHash().Hash}
+}
+
+func TestGraftConfigTreeNodeValueLeaf(t *testing.T) {
+	replacement := graftTestSapientLeaf()
+
+	tree := &v3.WalletConfigTreeNode{
+		Left: &v3.WalletConfigTreeAddressLeaf{Weight: 2, Address: common.HexToAddress("0x1111111111111111111111111111111111111111")},
+		Right: &v3.WalletConfigTreeNode{
+			Left:  v3.WalletConfigTreeNodeLeaf{Node: anonymousNodeLeaf(replacement)},
+			Right: &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x2222222222222222222222222222222222222222")},
+		},
+	}
+
+	grafted, ok := v3.GraftConfigTreeNode(tree, replacement)
+	require.True(t, ok)
+	require.Equal(t, tree.ImageHash().Hash, grafted.ImageHash().Hash)
+
+	node, ok := grafted.(*v3.WalletConfigTreeNode)
+	require.True(t, ok)
+	inner, ok := node.Right.(*v3.WalletConfigTreeNode)
+	require.True(t, ok)
+	require.Same(t, replacement, inner.Left)
+
+	// The input tree is not mutated.
+	require.IsType(t, v3.WalletConfigTreeNodeLeaf{}, tree.Right.(*v3.WalletConfigTreeNode).Left)
+}
+
+func TestGraftConfigTreeNodePointerLeaf(t *testing.T) {
+	replacement := graftTestSapientLeaf()
+
+	tree := &v3.WalletConfigTreeNode{
+		Left:  &v3.WalletConfigTreeNodeLeaf{Node: anonymousNodeLeaf(replacement)},
+		Right: &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x2222222222222222222222222222222222222222")},
+	}
+
+	grafted, ok := v3.GraftConfigTreeNode(tree, replacement)
+	require.True(t, ok)
+	require.Equal(t, tree.ImageHash().Hash, grafted.ImageHash().Hash)
+
+	node, ok := grafted.(*v3.WalletConfigTreeNode)
+	require.True(t, ok)
+	require.Same(t, replacement, node.Left)
+}
+
+func TestGraftConfigTreeNodeNestedLeaf(t *testing.T) {
+	// Non-sapient replacement: a plain subtree of address leaves.
+	replacement := &v3.WalletConfigTreeNode{
+		Left:  &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x3333333333333333333333333333333333333333")},
+		Right: &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x4444444444444444444444444444444444444444")},
+	}
+
+	tree := &v3.WalletConfigTreeNestedLeaf{
+		Weight:    3,
+		Threshold: 2,
+		Tree:      v3.WalletConfigTreeNodeLeaf{Node: anonymousNodeLeaf(replacement)},
+	}
+
+	grafted, ok := v3.GraftConfigTreeNode(tree, replacement)
+	require.True(t, ok)
+	require.Equal(t, tree.ImageHash().Hash, grafted.ImageHash().Hash)
+
+	nested, ok := grafted.(*v3.WalletConfigTreeNestedLeaf)
+	require.True(t, ok)
+	require.Equal(t, uint8(3), nested.Weight)
+	require.Equal(t, uint16(2), nested.Threshold)
+	require.Same(t, replacement, nested.Tree)
+}
+
+func TestGraftConfigTreeNodeAlreadyPresent(t *testing.T) {
+	present := graftTestSapientLeaf()
+
+	tree := &v3.WalletConfigTreeNode{
+		Left:  &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x1111111111111111111111111111111111111111")},
+		Right: present,
+	}
+
+	grafted, ok := v3.GraftConfigTreeNode(tree, graftTestSapientLeaf())
+	require.True(t, ok)
+	require.Equal(t, tree, grafted)
+	require.Same(t, present, grafted.(*v3.WalletConfigTreeNode).Right)
+
+	// The whole tree matching the replacement is also left unchanged.
+	grafted, ok = v3.GraftConfigTreeNode(present, graftTestSapientLeaf())
+	require.True(t, ok)
+	require.Same(t, present, grafted)
+}
+
+func TestGraftConfigTreeNodeNotFound(t *testing.T) {
+	tree := &v3.WalletConfigTreeNode{
+		Left:  &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x1111111111111111111111111111111111111111")},
+		Right: v3.WalletConfigTreeNodeLeaf{Node: core.ImageHash{Hash: common.HexToHash("0x00000000000000000000000000000000000000000000000000000000000000ff")}},
+	}
+
+	grafted, ok := v3.GraftConfigTreeNode(tree, graftTestSapientLeaf())
+	require.False(t, ok)
+	require.Same(t, tree, grafted)
+}
+
+func TestGraftConfigTreeNodeNil(t *testing.T) {
+	tree := &v3.WalletConfigTreeAddressLeaf{Weight: 1, Address: common.HexToAddress("0x1111111111111111111111111111111111111111")}
+
+	grafted, ok := v3.GraftConfigTreeNode(nil, graftTestSapientLeaf())
+	require.False(t, ok)
+	require.Nil(t, grafted)
+
+	grafted, ok = v3.GraftConfigTreeNode(tree, nil)
+	require.False(t, ok)
+	require.Same(t, tree, grafted)
+}