From 1322512443c0a05fe0ec93a0cedd0e6f409c2e09 Mon Sep 17 00:00:00 2001
From: ajaskolski <adrian.jaskolski@smartcontract.com>
Date: Wed, 6 May 2026 14:47:41 +0200
Subject: [PATCH] feat: port token approve

---
 common/changeset/token_approve.go      | 45 ++++++++++++++++++
 common/changeset/token_approve_test.go | 65 ++++++++++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 common/changeset/token_approve.go
 create mode 100644 common/changeset/token_approve_test.go

diff --git a/common/changeset/token_approve.go b/common/changeset/token_approve.go
new file mode 100644
index 0000000..dbb16c1
--- /dev/null
+++ b/common/changeset/token_approve.go
@@ -0,0 +1,45 @@
+package changeset
+
+import (
+	"fmt"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+
+	cldf "github.com/smartcontractkit/chainlink-deployments-framework/deployment"
+	"github.com/smartcontractkit/chainlink-evm/gethwrappers/shared/generated/initial/erc20"
+)
+
+// ApproveToken approves routerAddress to pull up to amount of token from the deployer on chain src.
+func ApproveToken(env cldf.Environment, src uint64, tokenAddress common.Address, routerAddress common.Address, amount *big.Int) error {
+	evmChains := env.BlockChains.EVMChains()
+	ch, ok := evmChains[src]
+	if !ok {
+		return fmt.Errorf("evm chain %d not found in environment", src)
+	}
+
+	if ch.Client == nil {
+		return fmt.Errorf("evm chain %d has no RPC client", src)
+	}
+
+	if ch.DeployerKey == nil {
+		return fmt.Errorf("evm chain %d has no deployer key", src)
+	}
+
+	token, err := erc20.NewERC20(tokenAddress, ch.Client)
+	if err != nil {
+		return err
+	}
+
+	tx, err := token.Approve(ch.DeployerKey, routerAddress, amount)
+	if err != nil {
+		return err
+	}
+
+	_, err = ch.Confirm(tx)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/common/changeset/token_approve_test.go b/common/changeset/token_approve_test.go
new file mode 100644
index 0000000..2488b53
--- /dev/null
+++ b/common/changeset/token_approve_test.go
@@ -0,0 +1,65 @@
+package changeset
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	chainselectors "github.com/smartcontractkit/chain-selectors"
+	"github.com/stretchr/testify/require"
+
+	"github.com/smartcontractkit/chainlink-deployments-framework/engine/test/environment"
+	"github.com/smartcontractkit/chainlink-evm/gethwrappers/shared/generated/initial/erc20"
+	"github.com/smartcontractkit/chainlink-evm/gethwrappers/shared/generated/initial/link_token"
+)
+
+func TestApproveToken_success_simulatedEVM(t *testing.T) {
+	t.Parallel()
+
+	selector := chainselectors.TEST_90000001.Selector
+	env, err := environment.New(t.Context(),
+		environment.WithEVMSimulated(t, []uint64{selector}),
+	)
+	require.NoError(t, err)
+
+	chain := env.BlockChains.EVMChains()[selector]
+
+	_, tx, lt, err := link_token.DeployLinkToken(chain.DeployerKey, chain.Client)
+	require.NoError(t, err)
+	_, err = chain.Confirm(tx)
+	require.NoError(t, err)
+
+	tx, err = lt.GrantMintAndBurnRoles(chain.DeployerKey, chain.DeployerKey.From)
+	require.NoError(t, err)
+	_, err = chain.Confirm(tx)
+	require.NoError(t, err)
+
+	tx, err = lt.Mint(chain.DeployerKey, chain.DeployerKey.From, big.NewInt(1_000_000))
+	require.NoError(t, err)
+	_, err = chain.Confirm(tx)
+	require.NoError(t, err)
+
+	spender := common.HexToAddress("0x00000000000000000000000000000000000000Ab")
+	amount := big.NewInt(12345)
+
+	require.NoError(t, ApproveToken(*env, selector, lt.Address(), spender, amount))
+
+	token, err := erc20.NewERC20(lt.Address(), chain.Client)
+	require.NoError(t, err)
+	got, err := token.Allowance(nil, chain.DeployerKey.From, spender)
+	require.NoError(t, err)
+	require.Zero(t, got.Cmp(amount))
+}
+
+func TestApproveToken_unknownChainSelector(t *testing.T) {
+	t.Parallel()
+
+	selector := chainselectors.TEST_90000001.Selector
+	env, err := environment.New(t.Context(),
+		environment.WithEVMSimulated(t, []uint64{selector}),
+	)
+	require.NoError(t, err)
+
+	err = ApproveToken(*env, selector+999_999_999, common.Address{}, common.Address{}, big.NewInt(1))
+	require.ErrorContains(t, err, "not found in environment")
+}