fix: a swap split across steps the user pays for shows every amount it spends (closes #625)
The swap's Amount line took only the first swap step's amount. It now gives the total the steps take of Token In: the amount of the step that sets the input side plus what each later step the user pays takes of it. A take of another token, one after an amount that is not a quantity, or one the decoder cannot tell, gets lines of its own; an unread take leaves no figure. A V4 step counts every SETTLE paid by the user and every SETTLE_ALL. A PERMIT2_PERMIT names Token In, and its amount stands only in the plain shape of Uniswap's own routes, checked in one place after the loop. Model: opus-5-5
This commit is contained in:
@@ -1289,6 +1289,658 @@ describe("uniswap decoder", () => {
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expect(detail(result, "Amount").value).not.toContain("500000000000");
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});
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// https://git.eeqj.de/sneak/AutistMask/issues/625 — a route split across
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// two swap steps the user pays for, with no PERMIT2_PERMIT, takes both
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// steps' amounts from the wallet. On next at 671b4d3 the Amount line read
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// only the first step's 600.0000 USDT.
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describe("a swap split across steps the user pays for", () => {
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const USDT_600 = 600000000n;
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const USDT_400 = 400000000n;
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const DAI_400 = 400000000000000000000n;
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const OTHER_ADDR = "0x1111111111111111111111111111111111111111";
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const UNDECODED = "Unknown (could not be decoded)";
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// The lines between Token In and Token Out, as [label, value].
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function linesBetweenTokens(result) {
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const lines = result.details.map((d) => [d.label, d.value]);
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const from = lines.findIndex(([label]) => label === "Token In");
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const to = lines.findIndex(([label]) => label === "Token Out");
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return lines.slice(from + 1, to);
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}
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// execute() of these command bytes and inputs, decoded as sent by
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// the user.
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function decodeSteps(commands, inputs) {
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const data = buildExecute(
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solidityPacked(
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commands.map(() => "uint8"),
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commands,
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),
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inputs,
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9999999999n,
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);
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return uniswap.decode(data, ROUTER_ADDR, "0x1", {}, USER_ADDR);
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}
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// The first step: a V3 exact-in of 600 USDT for USDC, paid by the
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// user, which sets the input side.
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const V3_600 = encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
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USDT_ADDR,
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USDC_ADDR,
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]);
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// V4 SETTLE of `amount` of `currency`, and TAKE of `amount` of
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// `currency` to `recipient`.
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const settle = (currency, amount, payerIsUser) =>
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coder.encode(
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["address", "uint256", "bool"],
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[currency, amount, payerIsUser],
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);
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const take = (currency, recipient, amount) =>
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coder.encode(
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["address", "address", "uint256"],
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[currency, recipient, amount],
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);
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// `input` with the top byte of its word at `index` set. This decoder
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// cannot read such a word as an address or a length; the router reads
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// its low bytes and runs the step.
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const dirtyWord = (input, index) => {
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const at = 2 + index * 64;
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return input.slice(0, at) + "ff" + input.slice(at + 2);
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};
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test("a split across a V3 and a V2 step the user pays for shows the total", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x00, 0x08]),
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[
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encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
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USDT_ADDR,
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USDC_ADDR,
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]),
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encodeV2SwapExactIn(USER_ADDR, USDT_400, 390000000n, [
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USDT_ADDR,
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USDC_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(
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data,
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ROUTER_ADDR,
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"0x1",
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{},
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USER_ADDR,
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);
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expect(result).not.toBeNull();
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expect(detail(result, "Token In").address.toLowerCase()).toBe(
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USDT_ADDR.toLowerCase(),
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);
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expect(detail(result, "Amount").value).toBe("1000.0000 USDT");
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expect(detail(result, "Amount").rawValue).toBe("1000.0000");
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expect(detail(result, "Moved from the sender")).toBeUndefined();
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});
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// In the order of Uniswap's own V4 routes: the swap, then a SETTLE of
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// OPEN_DELTA by the user, which pays what the swap spends.
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test("a split across a V3 step and a V4 step the user pays for shows the total", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x00, 0x10]),
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[
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encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
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USDT_ADDR,
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USDC_ADDR,
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]),
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encodeV4Swap(
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new Uint8Array([
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SETTLE_ID,
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V4_TAKE_ID,
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]),
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[
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encodeV4ExactInSingle(
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USDT_ADDR,
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USDC_ADDR,
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USDT_400,
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390000000n,
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),
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encodeV4Settle(USDT_ADDR), // paid by the user
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encodeV4Take(USDC_ADDR),
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],
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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(
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data,
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ROUTER_ADDR,
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"0x1",
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{},
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USER_ADDR,
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);
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expect(result).not.toBeNull();
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expect(detail(result, "Amount").value).toBe("1000.0000 USDT");
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expect(detail(result, "Moved from the sender")).toBeUndefined();
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});
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test("a second step the user pays for that spends another token shows that token's amount", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8"], [0x00, 0x08]),
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[
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encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
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USDT_ADDR,
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USDC_ADDR,
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]),
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encodeV2SwapExactIn(
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USER_ADDR,
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400000000000000000000n, // 400 DAI
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390000000n,
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[DAI_ADDR, USDC_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(
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data,
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ROUTER_ADDR,
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"0x1",
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{},
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USER_ADDR,
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);
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expect(result).not.toBeNull();
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expect(linesBetweenTokens(result)).toEqual([
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["Amount", "600.0000 USDT"],
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["Moved from the sender", "400.0000 DAI"],
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["Token moved", "DAI (" + DAI_ADDR + ")"],
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["Moved to", "The swap step that spends it"],
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]);
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});
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// Every later V4 step takes from the sender what its SETTLEs paid by
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// the user and its SETTLE_ALLs pay, each currency on its own, with a
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// swap action or without. Each of these read 600.0000 USDT alone
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// before.
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const USDT_FOR_USDC_400 = encodeV4ExactInSingle(
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USDT_ADDR,
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USDC_ADDR,
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USDT_400,
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390000000n,
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);
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const DAI_FOR_USDC_400 = encodeV4ExactInSingle(
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DAI_ADDR,
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USDC_ADDR,
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DAI_400,
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390000000n,
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);
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const DAI_GROUP = [
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["Moved from the sender", "400.0000 DAI"],
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["Token moved", "DAI (" + DAI_ADDR + ")"],
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["Moved to", "The swap step that spends it"],
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];
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test.each([
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{
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kind: "a V4 step paying USDT and DAI by a SETTLE_ALL of each",
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actions: [
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SETTLE_ALL_ID,
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V4_SETTLE_ALL_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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USDT_FOR_USDC_400,
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DAI_FOR_USDC_400,
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encodeV4SettleAll(USDT_ADDR, USDT_400),
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encodeV4SettleAll(DAI_ADDR, DAI_400),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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lines: [["Amount", "1000.0000 USDT"], ...DAI_GROUP],
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},
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{
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kind: "a V4 step with a SETTLE of USDT by the user, then a SETTLE of WETH from the router",
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actions: [
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V4_SETTLE_ID,
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V4_SETTLE_ID,
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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settle(USDT_ADDR, USDT_400, true),
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settle(WETH_ADDR, 2n ** 255n, false), // CONTRACT_BALANCE
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USDT_FOR_USDC_400,
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encodeV4ExactInSingle(WETH_ADDR, USDC_ADDR, 0n, 1n),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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lines: [["Amount", "1000.0000 USDT"]],
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},
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{
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kind: "a V4 step with no swap action: a SETTLE of 400 USDT by the user and a TAKE of it to another address",
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actions: [V4_SETTLE_ID, V4_TAKE_ID],
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params: [
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settle(USDT_ADDR, USDT_400, true),
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take(USDT_ADDR, OTHER_ADDR, USDT_400),
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],
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lines: [["Amount", "1000.0000 USDT"]],
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},
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// The SETTLE's amount, not the swap's, is what the user pays.
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{
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kind: "a V4 step swapping 400 USDT with a SETTLE of 5,000 USDT by the user, the rest taken to another address",
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actions: [
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V4_SETTLE_ID,
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_TAKE_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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settle(USDT_ADDR, 5000000000n, true),
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USDT_FOR_USDC_400,
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take(USDT_ADDR, OTHER_ADDR, 0n),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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lines: [["Amount", "5600.0000 USDT"]],
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},
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// A SETTLE_ALL pays all the step owes, here what the TAKE takes as
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// well as what the swap spends, so its amount is not known.
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{
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kind: "a V4 step with no swap action: a TAKE of 400 USDT to another address, then a SETTLE_ALL of USDT",
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actions: [V4_TAKE_ID, V4_SETTLE_ALL_ID],
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params: [
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take(USDT_ADDR, OTHER_ADDR, USDT_400),
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encodeV4SettleAll(USDT_ADDR, USDT_400),
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],
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lines: [
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["Moved from the sender", UNDECODED],
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["Token moved", "USDT (" + USDT_ADDR + ")"],
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["Moved to", "The swap step that spends it"],
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],
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},
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{
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kind: "a V4 step swapping 400 USDT, with a TAKE of 400 USDT to another address before its SETTLE_ALL of USDT",
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actions: [
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_TAKE_ID,
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V4_SETTLE_ALL_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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USDT_FOR_USDC_400,
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take(USDT_ADDR, OTHER_ADDR, USDT_400),
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encodeV4SettleAll(USDT_ADDR, 800000000n),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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lines: [
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["Moved from the sender", UNDECODED],
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["Token moved", "USDT (" + USDT_ADDR + ")"],
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["Moved to", "The swap step that spends it"],
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],
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},
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])(
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"a V3 step of 600 USDT, then $kind",
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({ actions, params, lines }) => {
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const result = decodeSteps(
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[0x00, 0x10],
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[V3_600, encodeV4Swap(new Uint8Array(actions), params)],
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);
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expect(linesBetweenTokens(result)).toEqual(lines);
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},
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);
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// A step that may take from the sender what the decoder did not read
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// leaves no Amount figure, which may be too low, and one line says so.
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const UNREAD_SWAP = V4_SWAP_ACTION_SHAPES[0].newer;
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test.each([
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{
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kind: "a V4 step whose SETTLE by the user cannot be read",
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actions: [
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SETTLE_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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USDT_FOR_USDC_400,
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dirtyWord(settle(USDT_ADDR, USDT_400, true), 0),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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},
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{
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kind: "a V4 step whose SETTLE_ALL cannot be read",
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actions: [
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SETTLE_ALL_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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USDT_FOR_USDC_400,
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dirtyWord(encodeV4SettleAll(USDT_ADDR, USDT_400), 0),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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},
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{
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kind: "a V4 step whose swap action and SETTLE_ALL cannot be read",
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actions: [
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V4_SWAP_EXACT_IN_SINGLE_ID,
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V4_SETTLE_ALL_ID,
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V4_TAKE_ALL_ID,
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],
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params: [
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UNREAD_SWAP,
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dirtyWord(encodeV4SettleAll(WETH_ADDR, ONE_WETH), 0),
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encodeV4TakeAll(USDC_ADDR, 0n),
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],
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},
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])("a V3 step of 600 USDT, then $kind", ({ actions, params }) => {
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const result = decodeSteps(
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[0x00, 0x10],
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[V3_600, encodeV4Swap(new Uint8Array(actions), params)],
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);
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expect(linesBetweenTokens(result)).toEqual([
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["Moved from the sender", UNDECODED],
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]);
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});
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test.each([
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{
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kind: "a V3 step of 600 USDT, then a V4 step whose input cannot be read",
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commands: [0x00, 0x10],
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inputs: [
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V3_600,
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dirtyWord(
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encodeV4Swap(new Uint8Array([V4_SETTLE_ID]), [
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settle(USDT_ADDR, USDT_400, true),
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]),
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2,
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),
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],
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},
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{
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kind: "a V4 step with no swap action whose SETTLE_ALL cannot be read, then a V3 step of 600 USDT",
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commands: [0x10, 0x00],
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inputs: [
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encodeV4Swap(
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new Uint8Array([V4_TAKE_ID, V4_SETTLE_ALL_ID]),
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[
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take(USDT_ADDR, OTHER_ADDR, USDT_400),
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dirtyWord(
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encodeV4SettleAll(USDT_ADDR, USDT_400),
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0,
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),
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],
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),
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V3_600,
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],
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},
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{
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kind: "a V3 step of 600 USDT, then a V2 step the user pays for whose input cannot be read",
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commands: [0x00, 0x08],
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inputs: [
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V3_600,
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dirtyWord(
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encodeV2SwapExactIn(OTHER_ADDR, USDT_400, 1n, [
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USDT_ADDR,
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USDC_ADDR,
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]),
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0,
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),
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],
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},
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{
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kind: "a V3 step of 600 USDT, then a PERMIT2_TRANSFER_FROM whose input cannot be read",
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commands: [0x00, 0x02],
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inputs: [
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V3_600,
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dirtyWord(
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coder.encode(
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["address", "address", "uint160"],
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[USDT_ADDR, OTHER_ADDR, USDT_400],
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),
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1,
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),
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],
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},
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{
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kind: "a V3 step of 600 USDT, then a PERMIT2_TRANSFER_FROM_BATCH",
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commands: [0x00, 0x0d],
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inputs: [
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V3_600,
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coder.encode(
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["tuple(address,address,uint160,address)[]"],
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[[[USER_ADDR, OTHER_ADDR, USDT_400, USDT_ADDR]]],
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),
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],
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},
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])("$kind", ({ commands, inputs }) => {
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const result = decodeSteps(commands, inputs);
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expect(linesBetweenTokens(result)).toEqual([
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["Moved from the sender", UNDECODED],
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]);
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});
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// A PERMIT2_PERMIT in the plain shape of Uniswap's own routes keeps
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// its own amount: Permit2 lets the router take no more of the token,
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// so the steps after it do not add to it.
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test("a split after a PERMIT2_PERMIT shows the permit's amount", () => {
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const data = buildExecute(
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solidityPacked(["uint8", "uint8", "uint8"], [0x0a, 0x00, 0x08]),
|
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[
|
||||
encodePermit2(USDT_ADDR, 5000000000n, ROUTER_ADDR), // 5000 USDT
|
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encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
encodeV2SwapExactIn(USER_ADDR, USDT_400, 390000000n, [
|
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USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
],
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9999999999n,
|
||||
);
|
||||
|
||||
const result = uniswap.decode(
|
||||
data,
|
||||
ROUTER_ADDR,
|
||||
"0x1",
|
||||
{},
|
||||
USER_ADDR,
|
||||
);
|
||||
expect(result).not.toBeNull();
|
||||
|
||||
expect(detail(result, "Amount").value).toBe("5000.0000 USDT");
|
||||
expect(detail(result, "Moved from the sender")).toBeUndefined();
|
||||
});
|
||||
|
||||
// Out of that shape the permit caps nothing the Amount line can rely
|
||||
// on, so the line gives the total the steps take, as with no permit.
|
||||
const ONE_USDT_PERMIT = (spender) =>
|
||||
encodePermit2(USDT_ADDR, 1000000n, spender);
|
||||
test.each([
|
||||
{
|
||||
kind: "to another spender",
|
||||
commands: [0x0a],
|
||||
permits: [ONE_USDT_PERMIT(OTHER_ADDR)],
|
||||
},
|
||||
{
|
||||
kind: "that the router lets fail",
|
||||
commands: [0x8a],
|
||||
permits: [ONE_USDT_PERMIT(ROUTER_ADDR)],
|
||||
},
|
||||
{
|
||||
kind: "followed by a second one",
|
||||
commands: [0x0a, 0x0a],
|
||||
permits: [
|
||||
ONE_USDT_PERMIT(ROUTER_ADDR),
|
||||
ONE_USDT_PERMIT(ROUTER_ADDR),
|
||||
],
|
||||
},
|
||||
])(
|
||||
"a split after a PERMIT2_PERMIT $kind shows the total the steps take",
|
||||
({ commands, permits }) => {
|
||||
const result = decodeSteps(
|
||||
[...commands, 0x00, 0x08],
|
||||
[
|
||||
...permits,
|
||||
V3_600,
|
||||
encodeV2SwapExactIn(USER_ADDR, USDT_400, 390000000n, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
],
|
||||
);
|
||||
expect(linesBetweenTokens(result)).toEqual([
|
||||
["Amount", "1000.0000 USDT"],
|
||||
]);
|
||||
},
|
||||
);
|
||||
|
||||
// A PERMIT2_PERMIT_BATCH, which this decoder does not read, may raise
|
||||
// what the router may take of the permit's token again.
|
||||
test("a split after a PERMIT2_PERMIT and a PERMIT2_PERMIT_BATCH shows the total the steps take", () => {
|
||||
const permitBatch = coder.encode(
|
||||
[
|
||||
"tuple(tuple(address,uint160,uint48,uint48)[],address,uint256)",
|
||||
"bytes",
|
||||
],
|
||||
[
|
||||
[
|
||||
[[USDT_ADDR, 10000000000n, 0, 0]], // 10,000 USDT
|
||||
ROUTER_ADDR,
|
||||
9999999999,
|
||||
],
|
||||
"0x1234",
|
||||
],
|
||||
);
|
||||
const result = decodeSteps(
|
||||
[0x0a, 0x03, 0x00, 0x08],
|
||||
[
|
||||
encodePermit2(USDT_ADDR, USDT_600, ROUTER_ADDR),
|
||||
permitBatch,
|
||||
V3_600,
|
||||
encodeV2SwapExactIn(USER_ADDR, 9400000000n, 1n, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
],
|
||||
);
|
||||
expect(linesBetweenTokens(result)).toEqual([
|
||||
["Amount", "10000.0000 USDT"],
|
||||
]);
|
||||
});
|
||||
|
||||
// A later step's amount that cannot be added to the Amount line,
|
||||
// because the amount of the step that set the input side is not a
|
||||
// quantity, gets lines of its own.
|
||||
const V2_EXACT_OUT_400 = encodeV2SwapExactOut(
|
||||
USER_ADDR,
|
||||
390000000n,
|
||||
USDT_400,
|
||||
[USDT_ADDR, USDC_ADDR],
|
||||
);
|
||||
const UP_TO_400_USDT = [
|
||||
["Moved from the sender", "Up to 400.0000 USDT"],
|
||||
["Token moved", "USDT (" + USDT_ADDR + ")"],
|
||||
["Moved to", "The swap step that spends it"],
|
||||
];
|
||||
test.each([
|
||||
{
|
||||
kind: "a V4 exact-out step with a SETTLE of OPEN_DELTA by the user",
|
||||
commands: [0x10, 0x09],
|
||||
first: encodeV4Swap(
|
||||
new Uint8Array([
|
||||
V4_SWAP_EXACT_OUT_SINGLE_ID,
|
||||
V4_SETTLE_ID,
|
||||
V4_TAKE_ALL_ID,
|
||||
]),
|
||||
[
|
||||
encodeV4ExactOutSingle(
|
||||
USDT_ADDR,
|
||||
WETH_ADDR,
|
||||
ONE_WETH,
|
||||
USDT_600,
|
||||
),
|
||||
encodeV4Settle(USDT_ADDR),
|
||||
encodeV4TakeAll(WETH_ADDR, 0n),
|
||||
],
|
||||
),
|
||||
lines: UP_TO_400_USDT,
|
||||
},
|
||||
{
|
||||
kind: "a V4 exact-in step of the open delta",
|
||||
commands: [0x10, 0x09],
|
||||
first: encodeV4Swap(
|
||||
new Uint8Array([
|
||||
V4_SWAP_EXACT_IN_SINGLE_ID,
|
||||
V4_SETTLE_ID,
|
||||
V4_TAKE_ALL_ID,
|
||||
]),
|
||||
[
|
||||
encodeV4ExactInSingle(USDT_ADDR, USDC_ADDR, 0n, 1n),
|
||||
encodeV4Settle(USDT_ADDR),
|
||||
encodeV4TakeAll(USDC_ADDR, 0n),
|
||||
],
|
||||
),
|
||||
lines: [
|
||||
["Amount", "All available (V4 open delta)"],
|
||||
...UP_TO_400_USDT,
|
||||
],
|
||||
},
|
||||
{
|
||||
kind: "a V2 exact-in step of ALREADY_PAID",
|
||||
commands: [0x08, 0x09],
|
||||
first: encodeV2SwapExactIn(USER_ADDR, 0n, 1n, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
lines: [
|
||||
[
|
||||
"Amount",
|
||||
"Whatever an earlier step sent to the pair (V2 already paid)",
|
||||
],
|
||||
...UP_TO_400_USDT,
|
||||
],
|
||||
},
|
||||
])(
|
||||
"$kind, then a V2 exact-out of at most 400 USDT the user pays for, shows the 400 USDT",
|
||||
({ commands, first, lines }) => {
|
||||
const result = decodeSteps(commands, [first, V2_EXACT_OUT_400]);
|
||||
expect(linesBetweenTokens(result)).toEqual(lines);
|
||||
},
|
||||
);
|
||||
|
||||
// A V2 exact-out step makes every amount the swap steps spend a maximum,
|
||||
// the total included.
|
||||
test("a split with a V2 exact-out step the user pays for shows the total as a maximum", () => {
|
||||
const data = buildExecute(
|
||||
solidityPacked(["uint8", "uint8"], [0x00, 0x09]),
|
||||
[
|
||||
encodeV3SwapExactIn(USER_ADDR, USDT_600, 590000000n, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
encodeV2SwapExactOut(USER_ADDR, 390000000n, USDT_400, [
|
||||
USDT_ADDR,
|
||||
USDC_ADDR,
|
||||
]),
|
||||
],
|
||||
9999999999n,
|
||||
);
|
||||
|
||||
const result = uniswap.decode(
|
||||
data,
|
||||
ROUTER_ADDR,
|
||||
"0x1",
|
||||
{},
|
||||
USER_ADDR,
|
||||
);
|
||||
expect(result).not.toBeNull();
|
||||
|
||||
expect(detail(result, "Amount").value).toBe("Up to 1000.0000 USDT");
|
||||
});
|
||||
});
|
||||
|
||||
// https://git.eeqj.de/sneak/AutistMask/issues/359 — the output half, in
|
||||
// the shape the issue measured: a V4 step that states a minimum of zero
|
||||
// and names no output currency.
|
||||
|
||||
Reference in New Issue
Block a user