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Adds a test that constructs a Uniswap V4 USDT→USDC swap using SETTLE/SWAP_EXACT_IN_SINGLE/TAKE sub-actions inside a V4_SWAP command. Without decodeV4Swap(), the output token would be unresolvable and the swap name would not show 'USDT → USDC'. This test fails on the old code and passes with the decodeV4Swap() fix. Refs: #59
357 lines
16 KiB
JavaScript
357 lines
16 KiB
JavaScript
const { AbiCoder, Interface, solidityPacked, getBytes } = require("ethers");
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const uniswap = require("../src/shared/uniswap");
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const ROUTER_ADDR = "0x66a9893cc07d91d95644aedd05d03f95e1dba8af";
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const USDT_ADDR = "0xdAC17F958D2ee523a2206206994597C13D831ec7";
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const WETH_ADDR = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2";
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const USDC_ADDR = "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48";
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const USER_ADDR = "0x66133E8ea0f5D1d612D2502a968757D1048c214a";
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// AutistMask's first-ever swap, 2026-02-27.
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// Swapped USDT for ETH via Uniswap V4 Universal Router.
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// https://etherscan.io/tx/0x6749f50c4e8f975b6d14780d5f539cf151d1594796ac49b7d6a5348ba0735e77
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const FIRST_SWAP_CALLDATA =
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"0x3593564c" +
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"000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0" +
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"0000000000000000000000000000000000000000000000000000000069a1550f00000000000000000000000000000000000000000000000000000000000000020a10000000000000000000000000000000000000000000000000000000000000" +
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"0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000001c0" +
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"0000000000000000000000000000000000000000000000000000000000000160000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7000000000000000000000000ffffffffffffffffffffffffffffffffffffffff" +
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"0000000000000000000000000000000000000000000000000000000069c8daf6000000000000000000000000000000000000000000000000000000000000000000000000000000000000000066a9893cc07d91d95644aedd05d03f95e1dba8af" +
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"0000000000000000000000000000000000000000000000000000000069a154fe00000000000000000000000000000000000000000000000000000000000000e00000000000000000000000000000000000000000000000000000000000000041" +
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"230249bb7133205db7b2389b587c723cc182302907b9545dc40c59c33ad1d53078a65732f4182fedbc0d9d85c51d580bdc93db3556fac38f18e140da47d0eb631c00000000000000000000000000000000000000000000000000000000000000" +
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"00000000000000000000000000000000000000000000000000000000000003c0000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000003" +
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"070b0e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000220" +
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"00000000000000000000000000000000000000000000000000000000000002a000000000000000000000000000000000000000000000000000000000000001a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7" +
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"0000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000007a1200000000000000000000000000000000000000000000000000000dcb050d338e7" +
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"0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000064" +
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"0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a0" +
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"0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000" +
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"dac17f958d2ee523a2206206994597c13d831ec70000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000000000000000000000000000" +
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"66133e8ea0f5d1d612d2502a968757d1048c214a0000000000000000000000000000000000000000000000000000000000000000756e6978000000000012";
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const coder = AbiCoder.defaultAbiCoder();
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const routerIface = new Interface([
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"function execute(bytes commands, bytes[] inputs, uint256 deadline)",
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]);
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// Helper: build a minimal execute() calldata from commands + inputs
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function buildExecute(commands, inputs, deadline) {
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return routerIface.encodeFunctionData("execute", [
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commands,
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inputs,
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deadline,
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]);
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}
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// Helper: encode a PERMIT2_PERMIT input (command 0x0a)
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function encodePermit2(token, amount, spender) {
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return coder.encode(
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[
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"tuple(tuple(address,uint160,uint48,uint48),address,uint256)",
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"bytes",
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],
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[[[token, amount, 0, 0], spender, 9999999999], "0x1234"],
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);
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}
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// Helper: encode a BALANCE_CHECK_ERC20 input (command 0x0e)
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function encodeBalanceCheck(owner, token, minBalance) {
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return coder.encode(
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["address", "address", "uint256"],
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[owner, token, minBalance],
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);
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}
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// Helper: encode a WRAP_ETH input (command 0x0b)
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function encodeWrapEth(recipient, amount) {
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return coder.encode(["address", "uint256"], [recipient, amount]);
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}
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// Helper: encode a V2_SWAP_EXACT_IN input (command 0x08)
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function encodeV2SwapExactIn(recipient, amountIn, amountOutMin, pathAddrs) {
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return coder.encode(
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["address", "uint256", "uint256", "address[]", "bool"],
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[recipient, amountIn, amountOutMin, pathAddrs, true],
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);
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}
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// Helper: encode a V3_SWAP_EXACT_IN input (command 0x00)
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function encodeV3SwapExactIn(recipient, amountIn, amountOutMin, pathTokens) {
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// V3 path: token(20) + fee(3) + token(20) ...
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let pathHex = pathTokens[0].slice(2).toLowerCase();
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for (let i = 1; i < pathTokens.length; i++) {
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pathHex += "000bb8"; // fee 3000 = 0x000bb8
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pathHex += pathTokens[i].slice(2).toLowerCase();
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}
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return coder.encode(
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["address", "uint256", "uint256", "bytes", "bool"],
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[recipient, amountIn, amountOutMin, "0x" + pathHex, true],
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);
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}
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// Helper: encode a V4_SWAP input (command 0x10) — just a passthrough blob
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function encodeV4Swap(actions, params) {
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return coder.encode(["bytes", "bytes[]"], [actions, params]);
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}
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describe("uniswap decoder", () => {
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test("returns null for non-execute calldata", () => {
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expect(uniswap.decode("0x", ROUTER_ADDR)).toBeNull();
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expect(uniswap.decode("0xdeadbeef", ROUTER_ADDR)).toBeNull();
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expect(uniswap.decode(null, ROUTER_ADDR)).toBeNull();
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});
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test("decodes first-ever AutistMask swap (PERMIT2_PERMIT + V4_SWAP)", () => {
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const result = uniswap.decode(FIRST_SWAP_CALLDATA, ROUTER_ADDR);
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expect(result).not.toBeNull();
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expect(result.name).toBe("Swap USDT \u2192 ETH");
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expect(result.description).toContain("Uniswap");
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const labels = result.details.map((d) => d.label);
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expect(labels).toContain("Protocol");
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expect(labels).toContain("Token In");
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expect(labels).toContain("Steps");
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expect(labels).toContain("Deadline");
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const tokenIn = result.details.find((d) => d.label === "Token In");
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expect(tokenIn.value).toContain("USDT");
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expect(tokenIn.address.toLowerCase()).toBe(USDT_ADDR.toLowerCase());
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const steps = result.details.find((d) => d.label === "Steps");
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expect(steps.value).toContain("Permit2 Permit");
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expect(steps.value).toContain("V4 Swap");
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});
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test("decodes V2_SWAP_EXACT_IN with known tokens", () => {
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const data = buildExecute(
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"0x08", // V2_SWAP_EXACT_IN
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[
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encodeV2SwapExactIn(
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USER_ADDR,
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1000000n, // 1 USDT (6 decimals)
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500000000000000n, // 0.0005 ETH
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[USDT_ADDR, WETH_ADDR],
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),
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],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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expect(result.name).toBe("Swap USDT \u2192 WETH");
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const amount = result.details.find((d) => d.label === "Amount");
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expect(amount.value).toBe("1.0000 USDT");
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const minOut = result.details.find((d) => d.label === "Min. received");
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expect(minOut.value).toContain("WETH");
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});
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test("decodes V3_SWAP_EXACT_IN with known tokens", () => {
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const data = buildExecute(
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"0x00", // V3_SWAP_EXACT_IN
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[
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encodeV3SwapExactIn(
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USER_ADDR,
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2000000n, // 2 USDT
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1000000000000000n, // 0.001 ETH
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[USDT_ADDR, WETH_ADDR],
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),
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],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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expect(result.name).toBe("Swap USDT \u2192 WETH");
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});
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test("decodes WRAP_ETH as ETH input", () => {
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const data = buildExecute(
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"0x0b", // WRAP_ETH
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[encodeWrapEth(ROUTER_ADDR, 1000000000000000000n)],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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const tokenIn = result.details.find((d) => d.label === "Token In");
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expect(tokenIn.value).toBe("ETH (native)");
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const amount = result.details.find((d) => d.label === "Amount");
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expect(amount.value).toContain("1.0000");
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expect(amount.value).toContain("ETH");
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});
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test("decodes UNWRAP_WETH as ETH output", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x08, 0x0c]),
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[
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encodeV2SwapExactIn(USER_ADDR, 1000000n, 500000000000000n, [
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USDT_ADDR,
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WETH_ADDR,
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]),
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encodeWrapEth(USER_ADDR, 0n), // UNWRAP_WETH same encoding
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],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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// UNWRAP_WETH means output is native ETH
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expect(result.name).toBe("Swap USDT \u2192 ETH");
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});
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test("decodes BALANCE_CHECK_ERC20 for min output", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x0b, 0x0e]),
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[
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encodeWrapEth(ROUTER_ADDR, 1000000000000000000n),
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encodeBalanceCheck(USER_ADDR, USDT_ADDR, 2000000n),
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],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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const minOut = result.details.find((d) => d.label === "Min. received");
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expect(minOut).toBeDefined();
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expect(minOut.value).toContain("2.0000");
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expect(minOut.value).toContain("USDT");
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});
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test("shows command names in steps", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8", "uint8"], [0x0a, 0x10, 0x0c]),
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[
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encodePermit2(USDT_ADDR, 1000000n, ROUTER_ADDR),
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encodeV4Swap("0x07", ["0x"]),
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encodeWrapEth(USER_ADDR, 0n), // reusing for UNWRAP_WETH
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],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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const steps = result.details.find((d) => d.label === "Steps");
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expect(steps.value).toBe(
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"Permit2 Permit \u2192 V4 Swap \u2192 Unwrap WETH",
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);
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});
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test("formats permit amount when not unlimited", () => {
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const data = buildExecute(
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"0x0a",
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[encodePermit2(USDT_ADDR, 5000000n, ROUTER_ADDR)],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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const amount = result.details.find((d) => d.label === "Amount");
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expect(amount.value).toBe("5.0000 USDT");
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});
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// This test validates the decodeV4Swap() fix: a V4 ERC20→ERC20 swap
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// (USDT→USDC) where the token addresses are ONLY discoverable inside
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// the V4_SWAP sub-actions (SETTLE/TAKE). Before decodeV4Swap() was added,
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// command 0x10 was opaque and this would decode as "Uniswap Swap" with
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// no token info (or "ETH → ETH"). Now it correctly shows "USDT → USDC".
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test("decodes V4_SWAP ERC20→ERC20 tokens via SETTLE/TAKE (regression: #59)", () => {
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// Build a V4_SWAP input with SETTLE(USDT) + SWAP_EXACT_IN_SINGLE + TAKE(USDC)
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const V4_SETTLE = 0x0b;
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const V4_SWAP_EXACT_IN_SINGLE = 0x06;
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const V4_TAKE = 0x0e;
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// actions: SETTLE, SWAP_EXACT_IN_SINGLE, TAKE
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const actions = new Uint8Array([
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V4_SETTLE,
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V4_SWAP_EXACT_IN_SINGLE,
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V4_TAKE,
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]);
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// SETTLE params: (address currency, uint256 maxAmount, bool payerIsUser)
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const settleParam = coder.encode(
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["address", "uint256", "bool"],
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[USDT_ADDR, 5000000n, true],
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);
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// SWAP_EXACT_IN_SINGLE params:
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// (tuple(address,address,uint24,int24,address) poolKey, bool zeroForOne, uint128 amountIn, uint128 amountOutMin, bytes hookData)
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const swapParam = coder.encode(
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[
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"tuple(tuple(address,address,uint24,int24,address),bool,uint128,uint128,bytes)",
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],
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[
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[
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[
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USDT_ADDR,
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USDC_ADDR,
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100, // fee
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1, // tickSpacing
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"0x0000000000000000000000000000000000000000", // hooks
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],
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true, // zeroForOne
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5000000n, // amountIn (5 USDT)
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4900000n, // amountOutMin (4.9 USDC)
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"0x", // hookData
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],
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],
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);
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// TAKE params: (address currency, address recipient, uint256 amount)
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const takeParam = coder.encode(
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["address", "address", "uint256"],
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[USDC_ADDR, USER_ADDR, 0n],
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);
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// Encode the V4_SWAP input: (bytes actions, bytes[] params)
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const v4Input = coder.encode(
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["bytes", "bytes[]"],
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[actions, [settleParam, swapParam, takeParam]],
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);
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// Build execute() with PERMIT2_PERMIT (0x0a) + V4_SWAP (0x10)
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// The permit provides the input token, but V4_SWAP must provide
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// the OUTPUT token — without decodeV4Swap, output would be unknown.
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x0a, 0x10]),
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[encodePermit2(USDT_ADDR, 5000000n, ROUTER_ADDR), v4Input],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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// Before decodeV4Swap fix: name would be "Swap USDT → ETH" or "Uniswap Swap"
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// After fix: correctly identifies both tokens from V4 sub-actions
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expect(result.name).toBe("Swap USDT \u2192 USDC");
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const tokenIn = result.details.find((d) => d.label === "Token In");
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expect(tokenIn.value).toContain("USDT");
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const steps = result.details.find((d) => d.label === "Steps");
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expect(steps.value).toContain("V4 Swap");
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});
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test("handles unknown tokens gracefully", () => {
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const fakeToken = "0x1111111111111111111111111111111111111111";
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const data = buildExecute(
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"0x0a",
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[encodePermit2(fakeToken, 1000000000000000000n, ROUTER_ADDR)],
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9999999999n,
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);
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const result = uniswap.decode(data, ROUTER_ADDR);
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expect(result).not.toBeNull();
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expect(result.name).toBe("Uniswap Swap");
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const tokenIn = result.details.find((d) => d.label === "Token In");
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expect(tokenIn.value).toContain(fakeToken);
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});
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});
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