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initial commit

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Signed-off-by: Uncle Fatso <uncle.fatso@ghostchain.io>
This commit is contained in:
Uncle Fatso 2025-05-11 16:04:09 +03:00
parent f83e9c701a
commit cfd9857dc0
Signed by: f4ts0
GPG Key ID: 565F4F2860226EBB
34 changed files with 3429 additions and 59 deletions
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7
.env.template Normal file
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DEPLOYMENT_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80
WETH_ADDRESS=
FEE_TO_ADDRESS=0x0000000000000000000000000000000000000000
SEPOLIA_TEST_RPC_URL=
SEPOLIA_TEST_API_KEY=
SEPOLIA_TEST_ENDPOINT=https://api-sepolia.etherscan.io/api

4
.gitignore vendored
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# Dotenv file
.env
# Soldeer
/dependencies

79
deployer.sh Normal file
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set -e
AVAILIABLE_NETWORKS=(anvil-localnet sepolia-testnet)
NETWORK="${AVAILIABLE_NETWORKS[0]}"
START=1
END=4
VERIFY_NEEDED="--verify"
while [[ $# -gt 0 ]];
do
case "${1}" in
-s|--start)
START="$2"
shift
shift
;;
-e|--end)
END="$2"
shift
shift
;;
-n|--network)
NETWORK="$2"
shift
shift
;;
esac
done
if [ "$NETWORK" == "anvil-localnet" ]; then
VERIFY_NEEDED=""
fi
found=false
for i in "${AVAILIABLE_NETWORKS[@]}"
do
if [ "$i" == "$NETWORK" ] ; then
found=true
fi
done
if [ $found == false ] ; then
echo "ERROR: '${NETWORK}' is incorrect network for deployment, valid networks are:"
for i in "${AVAILIABLE_NETWORKS[@]}"
do
echo -e "\t${i}"
done
exit
fi
for i in $(seq $START $END); do
if [ "0" == "$i" ]; then
CONTRACT="WETH9"
elif [ "1" == "$i" ] ; then
CONTRACT="UniswapV2Factory"
elif [ "2" == "$i" ]; then
CONTRACT="UniswapV2Router"
else
echo "No contract found for index $i"
exit
fi
forge script script/${CONTRACT}.s.sol:${CONTRACT}Script --rpc-url $NETWORK
if [ "$NETWORK" == "anvil-localnet" ]; then
answer="y"
else
read -p "Do you want to broadcast '${CONTRACT}' to ${NETWORK} (y/N)? " answer
fi
if [ "$answer" != "${answer#[Yy]}" ] ; then
forge script script/${CONTRACT}.s.sol:${CONTRACT}Script \
--rpc-url $NETWORK \
--broadcast \
${VERIFY_NEEDED} \
-vvv
else
exit
fi
done

24
foundry.toml
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[profile.default]
src = "src"
out = "out"
libs = ["lib"]
libs = ["lib", "dependencies"]
solc_version = "0.8.20"
# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
optimizer = true
optimizer_runs = 4294967295
remappings = [
"@openzeppelin-contracts/=dependencies/@openzeppelin-contracts-5.3.0/",
"forge-std-1.9.2/=dependencies/forge-std-1.9.2/",
]
fs_permissions = [{ access = "read", path = "./broadcast"}]
allow_internal_expect_revert = true
[dependencies]
forge-std = "1.9.7"
"@openzeppelin-contracts" = "5.3.0"
[rpc_endpoints]
anvil-localnet = "http://127.0.0.1:8545"
sepolia-testnet = "${SEPOLIA_TEST_RPC_URL}"
[etherscan]
sepolia-testnet = { key = "${SEPOLIA_TEST_API_KEY}", url = "${SEPOLIA_TEST_ENDPOINT}" }

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remappings.txt Normal file
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@openzeppelin-contracts-5.3.0/=dependencies/@openzeppelin-contracts-5.3.0/
forge-std-1.9.7/=dependencies/forge-std-1.9.7/

56
script/AddressFileRW.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {Script} from "forge-std/Script.sol";
import {stdJson} from "forge-std/StdJson.sol";
import "@openzeppelin-contracts/utils/Strings.sol";
contract AddressFileRWScript is Script {
using stdJson for string;
function _readFromFile(string memory fileName) internal view returns (address) {
string memory root = vm.projectRoot();
string memory path = string.concat(
root,
"/broadcast/",
fileName,
".s.sol/",
Strings.toString(block.chainid),
"/run-latest.json"
);
string memory json = vm.readFile(path);
bytes memory contractAddress = stdJson.parseRaw(
json,
".transactions[0].contractAddress"
);
return _bytesToAddress(contractAddress);
}
function _uint2str(uint256 _i) internal pure returns (string memory str) {
if (_i == 0) {
return "0";
}
uint256 j = _i;
uint256 length;
while (j != 0) {
length++;
j /= 10;
}
bytes memory bstr = new bytes(length);
uint256 k = length;
j = _i;
while (j != 0) {
bstr[--k] = bytes1(uint8(48 + j % 10));
j /= 10;
}
str = string(bstr);
}
function _bytesToAddress(bytes memory bys) internal pure returns (address addr) {
assembly {
addr := mload(add(bys, 32))
}
}
}

19
script/Counter.s.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
import {Script, console} from "forge-std/Script.sol";
import {Counter} from "../src/Counter.sol";
contract CounterScript is Script {
Counter public counter;
function setUp() public {}
function run() public {
vm.startBroadcast();
counter = new Counter();
vm.stopBroadcast();
}
}

24
script/UniswapV2Factory.s.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {Script,console} from "forge-std/Script.sol";
import "../src/UniswapV2Factory.sol";
import "./AddressFileRW.sol";
contract UniswapV2FactoryScript is Script {
function setUp() public {}
function run() public {
uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
address feeToAddress = vm.envAddress("FEE_TO_ADDRESS");
address account = vm.addr(privateKey);
console.log("Deployment Account : ", account);
console.log("Fee to Address : ", feeToAddress);
vm.broadcast(privateKey);
UniswapV2Factory factory = new UniswapV2Factory(feeToAddress);
console.log("\n\tFactory Address: ", address(factory));
}
}

32
script/UniswapV2Router.s.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {console} from "forge-std/Script.sol";
import "../src/UniswapV2Router.sol";
import "./AddressFileRW.sol";
contract UniswapV2RouterScript is AddressFileRWScript {
function setUp() public {}
function run() public {
uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
address account = vm.addr(privateKey);
address factoryAddress = _readFromFile("UniswapV2Factory");
address wethAddress;
try vm.envAddress("WETH_ADDRESS") returns (address maybeWethAddress) {
wethAddress = maybeWethAddress;
} catch {
wethAddress = _readFromFile("WETH9");
}
console.log("Deployment Account : ", account);
console.log("WETH9 Address : ", wethAddress);
console.log("UniswapV2 Factory : ", factoryAddress);
vm.broadcast(privateKey);
UniswapV2Router router = new UniswapV2Router(factoryAddress, wethAddress);
console.log("\n\tRouter Address: ", address(router));
}
}

19
script/WETH9.s.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;
import {Script,console} from "forge-std/Script.sol";
import "../src/WETH9.sol";
contract WETH9Script is Script {
function setUp() public {}
function run() public {
uint256 privateKey = vm.envUint("DEPLOYMENT_PRIVATE_KEY");
address account = vm.addr(privateKey);
console.log("Deployment Account : ", account);
vm.broadcast(privateKey);
WETH9 weth = new WETH9();
console.log("\n\tWETH9 Address: ", address(weth));
}
}

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soldeer.lock Normal file
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[[dependencies]]
name = "@openzeppelin-contracts"
version = "5.3.0"
url = "https://soldeer-revisions.s3.amazonaws.com/@openzeppelin-contracts/5_3_0_10-04-2025_10:51:50_contracts.zip"
checksum = "fa2bc3db351137c4d5eb32b738a814a541b78e87fbcbfeca825e189c4c787153"
integrity = "d69addf252dfe0688dcd893a7821cbee2421f8ce53d95ca0845a59530043cfd1"
[[dependencies]]
name = "forge-std"
version = "1.9.7"
url = "https://soldeer-revisions.s3.amazonaws.com/forge-std/1_9_7_28-04-2025_15:55:08_forge-std-1.9.zip"
checksum = "8d9e0a885fa8ee6429a4d344aeb6799119f6a94c7c4fe6f188df79b0dce294ba"
integrity = "9e60fdba82bc374df80db7f2951faff6467b9091873004a3d314cf0c084b3c7d"

14
src/Counter.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
contract Counter {
uint256 public number;
function setNumber(uint256 newNumber) public {
number = newNumber;
}
function increment() public {
number++;
}
}

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src/UniswapV2ERC20.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "./interfaces/IUniswapV2ERC20.sol";
contract UniswapV2ERC20 is IUniswapV2ERC20 {
string public constant override name = "Uniswap V2";
string public constant override symbol = "UNI-V2";
uint8 public constant override decimals = 18;
uint256 public override totalSupply;
mapping(address => uint256) public override balanceOf;
mapping(address => mapping(address => uint256)) public override allowance;
bytes32 public override DOMAIN_SEPARATOR;
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant override PERMIT_TYPEHASH =
0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
mapping(address => uint256) public override nonces;
constructor() {
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256(bytes("1")),
block.chainid,
address(this)
)
);
}
function _mint(address to, uint256 value) internal {
totalSupply += value;
balanceOf[to] += value;
emit Transfer(address(0), to, value);
}
function _burn(address from, uint256 value) internal {
balanceOf[from] -= value;
totalSupply -= value;
emit Transfer(from, address(0), value);
}
function _approve(address owner, address spender, uint256 value) private {
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
function _transfer(address from, address to, uint256 value) private {
balanceOf[from] -= value;
balanceOf[to] += value;
emit Transfer(from, to, value);
}
function approve(
address spender,
uint256 value
) external override returns (bool) {
_approve(msg.sender, spender, value);
return true;
}
function transfer(
address to,
uint256 value
) external override returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
function transferFrom(
address from,
address to,
uint256 value
) external override returns (bool) {
if (allowance[from][msg.sender] != type(uint256).max) {
allowance[from][msg.sender] -= value;
}
_transfer(from, to, value);
return true;
}
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external override {
if (deadline < block.timestamp) revert("UniswapV2: EXPIRED");
bytes32 digest = keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(
abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
value,
nonces[owner]++,
deadline
)
)
)
);
address recoveredAddress = ecrecover(digest, v, r, s);
if (recoveredAddress == address(0) || recoveredAddress != owner) revert("UniswapV2: INVALID_SIGNATURE");
_approve(owner, spender, value);
}
}

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src/UniswapV2Factory.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./UniswapV2Pair.sol";
contract UniswapV2Factory is IUniswapV2Factory {
bytes32 public constant PAIR_HASH = keccak256(type(UniswapV2Pair).creationCode);
address public override feeTo;
address public override feeToSetter;
mapping(address => mapping(address => address)) public override getPair;
address[] public override allPairs;
constructor(address _feeToSetter) {
feeToSetter = _feeToSetter;
}
function allPairsLength() external view override returns (uint256) {
return allPairs.length;
}
function createPair(
address tokenA,
address tokenB
) external override returns (address pair) {
if (tokenA == tokenB) revert("UniswapV2: IDENTICAL_ADDRESSES");
(address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
if (token0 == address(0)) revert("UniswapV2: ZERO_ADDRESS");
if (getPair[token0][token1] != address(0)) revert("UniswapV2: PAIR_EXISTS");
bytes memory bytecode = type(UniswapV2Pair).creationCode;
bytes32 salt = keccak256(abi.encodePacked(token0, token1));
assembly {
pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
}
IUniswapV2Pair(pair).initialize(token0, token1);
getPair[token0][token1] = pair;
getPair[token1][token0] = pair; // populate mapping in the reverse direction
allPairs.push(pair);
emit PairCreated(token0, token1, pair, allPairs.length);
}
function setFeeTo(address _feeTo) external override {
if (msg.sender != feeToSetter) revert("UniswapV2: FORBIDDEN");
feeTo = _feeTo;
}
function setFeeToSetter(address _feeToSetter) external override {
if (msg.sender != feeToSetter) revert("UniswapV2: FORBIDDEN");
feeToSetter = _feeToSetter;
}
}

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src/UniswapV2Pair.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "./UniswapV2ERC20.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapV2Callee.sol";
import "./interfaces/IERC20.sol";
import "./libraries/Math.sol";
import "./libraries/UQ112x112.sol";
import "./libraries/TransferHelper.sol";
contract UniswapV2Pair is IUniswapV2Pair, UniswapV2ERC20 {
using UQ112x112 for uint224;
uint256 public constant override MINIMUM_LIQUIDITY = 10 ** 3;
address public override factory;
address public override token0;
address public override token1;
uint112 private reserve0; // uses single storage slot, accessible via getReserves
uint112 private reserve1; // uses single storage slot, accessible via getReserves
uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves
uint256 public override price0CumulativeLast;
uint256 public override price1CumulativeLast;
uint256 public override kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
uint256 private unlocked = 1;
modifier lock() {
if (unlocked == 0) revert("UniswapV2: LOCKED");
unlocked = 0;
_;
unlocked = 1;
}
function getReserves()
public
view
override
returns (
uint112 _reserve0,
uint112 _reserve1,
uint32 _blockTimestampLast
)
{
_reserve0 = reserve0;
_reserve1 = reserve1;
_blockTimestampLast = blockTimestampLast;
}
constructor() {
factory = msg.sender;
}
function initialize(address _token0, address _token1) external override {
if (msg.sender != factory) revert("UniswapV2: FORBIDDEN"); // sufficient check
token0 = _token0;
token1 = _token1;
}
function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
if (balance0 > type(uint112).max || balance1 > type(uint112).max) revert("UniswapV2: OVERFLOW");
uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
unchecked {
uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
}
}
reserve0 = uint112(balance0);
reserve1 = uint112(balance1);
blockTimestampLast = blockTimestamp;
emit Sync(reserve0, reserve1);
}
function _mintFee(
uint112 _reserve0,
uint112 _reserve1
) private returns (bool feeOn) {
address feeTo = IUniswapV2Factory(factory).feeTo();
feeOn = feeTo != address(0);
uint256 _kLast = kLast; // gas savings
if (feeOn) {
if (_kLast != 0) {
uint256 rootK = UniswapV2Math.sqrt(uint256(_reserve0) * _reserve1);
uint256 rootKLast = UniswapV2Math.sqrt(_kLast);
if (rootK > rootKLast) {
uint256 numerator = totalSupply * (rootK - rootKLast);
uint256 denominator = rootK * 5 + rootKLast;
uint256 liquidity = numerator / denominator;
if (liquidity > 0) _mint(feeTo, liquidity);
}
}
} else if (_kLast != 0) {
kLast = 0;
}
}
function mint(address to) external override lock returns (uint256 liquidity) {
(uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
uint256 balance0 = IERC20(token0).balanceOf(address(this));
uint256 balance1 = IERC20(token1).balanceOf(address(this));
uint256 amount0 = balance0 - _reserve0;
uint256 amount1 = balance1 - _reserve1;
bool feeOn = _mintFee(_reserve0, _reserve1);
uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
if (_totalSupply == 0) {
liquidity = UniswapV2Math.sqrt(amount0 * amount1) - MINIMUM_LIQUIDITY;
_mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
} else {
liquidity = UniswapV2Math.min(amount0 * _totalSupply / _reserve0, amount1 * _totalSupply / _reserve1);
}
if (liquidity == 0) revert("UniswapV2: INSUFFICIENT_LIQUIDITY_MINTED");
_mint(to, liquidity);
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
emit Mint(msg.sender, amount0, amount1);
}
function burn(address to) external override lock returns (uint256 amount0, uint256 amount1) {
(uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
uint256 balance0 = IERC20(_token0).balanceOf(address(this));
uint256 balance1 = IERC20(_token1).balanceOf(address(this));
uint256 liquidity = balanceOf[address(this)];
bool feeOn = _mintFee(_reserve0, _reserve1);
uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
amount0 = (liquidity * balance0) / _totalSupply; // using balances ensures pro-rata distribution
amount1 = (liquidity * balance1) / _totalSupply; // using balances ensures pro-rata distribution
if (amount0 == 0 || amount1 == 0) revert("UniswapV2: INSUFFICIENT_LIQUIDITY_BURNED");
_burn(address(this), liquidity);
TransferHelper.safeTransfer(_token0, to, amount0);
TransferHelper.safeTransfer(_token1, to, amount1);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
_update(balance0, balance1, _reserve0, _reserve1);
if (feeOn) kLast = uint256(reserve0) * reserve1; // reserve0 and reserve1 are up-to-date
emit Burn(msg.sender, amount0, amount1, to);
}
function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external override lock {
if (amount0Out == 0 && amount1Out == 0) revert("UniswapV2: INSUFFICIENT_OUTPUT_AMOUNT");
(uint112 _reserve0, uint112 _reserve1, ) = getReserves(); // gas savings
if (amount0Out >= _reserve0 || amount1Out >= _reserve1) revert("UniswapV2: INSUFFICIENT_LIQUIDITY");
uint256 balance0;
uint256 balance1;
{
// scope for _token{0,1}, avoids stack too deep errors
address _token0 = token0;
address _token1 = token1;
if (to == _token0 || to == _token1) revert("UniswapV2: INVALID_TO");
if (amount0Out > 0) TransferHelper.safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
if (amount1Out > 0) TransferHelper.safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);
balance0 = IERC20(_token0).balanceOf(address(this));
balance1 = IERC20(_token1).balanceOf(address(this));
}
uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
if (amount0In == 0 && amount1In == 0) revert("UniswapV2: INSUFFICIENT_INPUT_AMOUNT");
{
// scope for reserve{0,1}Adjusted, avoids stack too deep errors
uint256 balance0Adjusted = balance0 * 1000 - amount0In * 3;
uint256 balance1Adjusted = balance1 * 1000 - amount1In * 3;
if (balance0Adjusted * balance1Adjusted < uint256(_reserve0) * uint256(_reserve1) * 1e6) {
revert("UniswapV2: K");
}
}
_update(balance0, balance1, _reserve0, _reserve1);
emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
}
function skim(address to) external override lock {
address _token0 = token0; // gas savings
address _token1 = token1; // gas savings
TransferHelper.safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)) - reserve0);
TransferHelper.safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)) - reserve1);
}
function sync() external override lock {
_update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
}
}

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src/UniswapV2Router.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "./interfaces/IUniswapV2Factory.sol";
import "./interfaces/IUniswapV2Router.sol";
import "./interfaces/IUniswapV2Pair.sol";
import "./interfaces/IWETH.sol";
import "./interfaces/IERC20.sol";
import {TransferHelper} from "./libraries/TransferHelper.sol";
import {UniswapV2Library} from "./libraries/UniswapV2Library.sol";
contract UniswapV2Router is IUniswapV2Router {
//solhint-disable-next-line immutable-vars-naming
address public immutable override factory;
address public immutable override WETH;
modifier ensure(uint256 deadline) {
if (deadline < block.timestamp) revert("UniswapV2Router: EXPIRED");
_;
}
constructor(address _factory, address _WETH) {
factory = _factory;
WETH = _WETH;
}
receive() external payable {
assert(msg.sender == WETH); // only accept ETH via fallback from the WETH contract
}
// **** ADD LIQUIDITY ****
function _addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin
) internal virtual returns (uint256 amountA, uint256 amountB) {
// create the pair if it doesn't exist yet
if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {
IUniswapV2Factory(factory).createPair(tokenA, tokenB);
}
(uint256 reserveA, uint256 reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);
if (reserveA == 0 && reserveB == 0) {
(amountA, amountB) = (amountADesired, amountBDesired);
} else {
uint256 amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);
if (amountBOptimal <= amountBDesired) {
if (amountBOptimal < amountBMin) revert("UniswapV2Router: INSUFFICIENT_B_AMOUNT");
(amountA, amountB) = (amountADesired, amountBOptimal);
} else {
uint256 amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);
assert(amountAOptimal <= amountADesired);
if (amountAOptimal < amountAMin) revert("UniswapV2Router: INSUFFICIENT_A_AMOUNT");
(amountA, amountB) = (amountAOptimal, amountBDesired);
}
}
}
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
external
virtual
override
ensure(deadline)
returns (uint256 amountA, uint256 amountB, uint256 liquidity)
{
(amountA, amountB) = _addLiquidity(tokenA, tokenB, amountADesired, amountBDesired, amountAMin, amountBMin);
address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
TransferHelper.safeTransferFrom(tokenA, msg.sender, pair, amountA);
TransferHelper.safeTransferFrom(tokenB, msg.sender, pair, amountB);
liquidity = IUniswapV2Pair(pair).mint(to);
}
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
virtual
override
ensure(deadline)
returns (uint256 amountToken, uint256 amountETH, uint256 liquidity)
{
(amountToken, amountETH) = _addLiquidity(
token,
WETH,
amountTokenDesired,
msg.value,
amountTokenMin,
amountETHMin
);
address pair = UniswapV2Library.pairFor(factory, token, WETH);
TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);
IWETH(WETH).deposit{value: amountETH}();
assert(IWETH(WETH).transfer(pair, amountETH));
liquidity = IUniswapV2Pair(pair).mint(to);
// refund dust eth, if any
if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);
}
// **** REMOVE LIQUIDITY ****
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
)
public
virtual
override
ensure(deadline)
returns (uint256 amountA, uint256 amountB)
{
address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
IUniswapV2Pair(pair).transferFrom(msg.sender, pair, liquidity); // send liquidity to pair
(uint256 amount0, uint256 amount1) = IUniswapV2Pair(pair).burn(to);
(address token0, ) = UniswapV2Library.sortTokens(tokenA, tokenB);
(amountA, amountB) = tokenA == token0 ? (amount0, amount1) : (amount1, amount0);
if (amountA < amountAMin) revert("UniswapV2Router: INSUFFICIENT_A_AMOUNT");
if (amountB < amountBMin) revert("UniswapV2Router: INSUFFICIENT_B_AMOUNT");
}
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
public
virtual
override
ensure(deadline)
returns (uint256 amountToken, uint256 amountETH)
{
(amountToken, amountETH) = removeLiquidity(
token,
WETH,
liquidity,
amountTokenMin,
amountETHMin,
address(this),
deadline
);
TransferHelper.safeTransfer(token, to, amountToken);
IWETH(WETH).withdraw(amountETH);
TransferHelper.safeTransferETH(to, amountETH);
}
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external virtual override returns (uint256 amountA, uint256 amountB) {
address pair = UniswapV2Library.pairFor(factory, tokenA, tokenB);
uint256 value = approveMax ? type(uint256).max : liquidity;
IUniswapV2Pair(pair).permit(
msg.sender,
address(this),
value,
deadline,
v,
r,
s
);
(amountA, amountB) = removeLiquidity(
tokenA,
tokenB,
liquidity,
amountAMin,
amountBMin,
to,
deadline
);
}
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
)
external
virtual
override
returns (uint256 amountToken, uint256 amountETH)
{
address pair = UniswapV2Library.pairFor(factory, token, WETH);
uint256 value = approveMax ? type(uint256).max : liquidity;
IUniswapV2Pair(pair).permit(
msg.sender,
address(this),
value,
deadline,
v,
r,
s
);
(amountToken, amountETH) = removeLiquidityETH(
token,
liquidity,
amountTokenMin,
amountETHMin,
to,
deadline
);
}
// **** REMOVE LIQUIDITY (supporting fee-on-transfer tokens) ****
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) public virtual override ensure(deadline) returns (uint256 amountETH) {
(, amountETH) = removeLiquidity(
token,
WETH,
liquidity,
amountTokenMin,
amountETHMin,
address(this),
deadline
);
TransferHelper.safeTransfer(token, to, IERC20(token).balanceOf(address(this)));
IWETH(WETH).withdraw(amountETH);
TransferHelper.safeTransferETH(to, amountETH);
}
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external virtual override returns (uint256 amountETH) {
address pair = UniswapV2Library.pairFor(factory, token, WETH);
uint256 value = approveMax ? type(uint256).max : liquidity;
IUniswapV2Pair(pair).permit(
msg.sender,
address(this),
value,
deadline,
v,
r,
s
);
amountETH = removeLiquidityETHSupportingFeeOnTransferTokens(
token,
liquidity,
amountTokenMin,
amountETHMin,
to,
deadline
);
}
// **** SWAP ****
// requires the initial amount to have already been sent to the first pair
function _swap(
uint256[] memory amounts,
address[] memory path,
address _to
) internal virtual {
for (uint256 i; i < path.length - 1; i++) {
(address input, address output) = (path[i], path[i + 1]);
(address token0, ) = UniswapV2Library.sortTokens(input, output);
uint256 amountOut = amounts[i + 1];
(uint256 amount0Out, uint256 amount1Out) = input == token0
? (uint256(0), amountOut)
: (amountOut, uint256(0));
address to = i < path.length - 2
? UniswapV2Library.pairFor(factory, output, path[i + 2])
: _to;
IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output)).swap(
amount0Out, amount1Out, to, new bytes(0)
);
}
}
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
)
external
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
if (amounts[amounts.length - 1] < amountOutMin)
revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amounts[0]
);
_swap(amounts, path, to);
}
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
)
external
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
if (amounts[0] > amountInMax) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amounts[0]
);
_swap(amounts, path, to);
}
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
)
external
payable
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
amounts = UniswapV2Library.getAmountsOut(factory, msg.value, path);
if (amounts[amounts.length - 1] < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
IWETH(WETH).deposit{value: amounts[0]}();
assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
_swap(amounts, path, to);
}
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
)
external
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
if (amounts[0] > amountInMax) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amounts[0]
);
_swap(amounts, path, address(this));
IWETH(WETH).withdraw(amounts[amounts.length - 1]);
TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
}
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
)
external
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
amounts = UniswapV2Library.getAmountsOut(factory, amountIn, path);
if (amounts[amounts.length - 1] < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amounts[0]
);
_swap(amounts, path, address(this));
IWETH(WETH).withdraw(amounts[amounts.length - 1]);
TransferHelper.safeTransferETH(to, amounts[amounts.length - 1]);
}
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
)
external
payable
virtual
override
ensure(deadline)
returns (uint256[] memory amounts)
{
if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
amounts = UniswapV2Library.getAmountsIn(factory, amountOut, path);
if (amounts[0] > msg.value) revert("UniswapV2Router: EXCESSIVE_INPUT_AMOUNT");
IWETH(WETH).deposit{value: amounts[0]}();
assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amounts[0]));
_swap(amounts, path, to);
// refund dust eth, if any
if (msg.value > amounts[0]) TransferHelper.safeTransferETH(msg.sender, msg.value - amounts[0]);
}
// **** SWAP (supporting fee-on-transfer tokens) ****
// requires the initial amount to have already been sent to the first pair
function _swapSupportingFeeOnTransferTokens(
address[] memory path,
address _to
) internal virtual {
for (uint256 i; i < path.length - 1; i++) {
(address input, address output) = (path[i], path[i + 1]);
(address token0, ) = UniswapV2Library.sortTokens(input, output);
IUniswapV2Pair pair = IUniswapV2Pair(UniswapV2Library.pairFor(factory, input, output));
uint256 amountInput;
uint256 amountOutput;
{
// scope to avoid stack too deep errors
(uint256 reserve0, uint256 reserve1, ) = pair.getReserves();
(uint256 reserveInput, uint256 reserveOutput) = input == token0
? (reserve0, reserve1)
: (reserve1, reserve0);
amountInput =
IERC20(input).balanceOf(address(pair)) -
reserveInput;
amountOutput = UniswapV2Library.getAmountOut(
amountInput,
reserveInput,
reserveOutput
);
}
(uint256 amount0Out, uint256 amount1Out) = input == token0
? (uint256(0), amountOutput)
: (amountOutput, uint256(0));
address to = i < path.length - 2
? UniswapV2Library.pairFor(factory, output, path[i + 2])
: _to;
pair.swap(amount0Out, amount1Out, to, new bytes(0));
}
}
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external virtual override ensure(deadline) {
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amountIn
);
uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
_swapSupportingFeeOnTransferTokens(path, to);
if (IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore < amountOutMin) {
revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
}
}
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable virtual override ensure(deadline) {
if (path[0] != WETH) revert("UniswapV2Router: INVALID_PATH");
uint256 amountIn = msg.value;
IWETH(WETH).deposit{value: amountIn}();
assert(IWETH(WETH).transfer(UniswapV2Library.pairFor(factory, path[0], path[1]), amountIn));
uint256 balanceBefore = IERC20(path[path.length - 1]).balanceOf(to);
_swapSupportingFeeOnTransferTokens(path, to);
if (IERC20(path[path.length - 1]).balanceOf(to) - balanceBefore < amountOutMin) {
revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
}
}
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external virtual override ensure(deadline) {
if (path[path.length - 1] != WETH) revert("UniswapV2Router: INVALID_PATH");
TransferHelper.safeTransferFrom(
path[0],
msg.sender,
UniswapV2Library.pairFor(factory, path[0], path[1]),
amountIn
);
_swapSupportingFeeOnTransferTokens(path, address(this));
uint256 amountOut = IERC20(WETH).balanceOf(address(this));
if (amountOut < amountOutMin) revert("UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
IWETH(WETH).withdraw(amountOut);
TransferHelper.safeTransferETH(to, amountOut);
}
// **** LIBRARY FUNCTIONS ****
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) public pure virtual override returns (uint256 amountB) {
return UniswapV2Library.quote(amountA, reserveA, reserveB);
}
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) public pure virtual override returns (uint256 amountOut) {
return UniswapV2Library.getAmountOut(amountIn, reserveIn, reserveOut);
}
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) public pure virtual override returns (uint256 amountIn) {
return UniswapV2Library.getAmountIn(amountOut, reserveIn, reserveOut);
}
function getAmountsOut(
uint256 amountIn,
address[] memory path
) public view virtual override returns (uint256[] memory amounts) {
return UniswapV2Library.getAmountsOut(factory, amountIn, path);
}
function getAmountsIn(
uint256 amountOut,
address[] memory path
) public view virtual override returns (uint256[] memory amounts) {
return UniswapV2Library.getAmountsIn(factory, amountOut, path);
}
}

760
src/WETH9.sol Normal file
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@ -0,0 +1,760 @@
// Copyright (C) 2015, 2016, 2017 Dapphub
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity =0.8.20;
contract WETH9 {
string public name = "Wrapped Ether";
string public symbol = "WETH";
uint8 public decimals = 18;
event Approval(address indexed src, address indexed guy, uint wad);
event Transfer(address indexed src, address indexed dst, uint wad);
event Deposit(address indexed dst, uint wad);
event Withdrawal(address indexed src, uint wad);
mapping (address => uint) public balanceOf;
mapping (address => mapping (address => uint)) public allowance;
fallback() external payable {
deposit();
}
receive() external payable {
deposit();
}
function deposit() public payable {
balanceOf[msg.sender] += msg.value;
emit Deposit(msg.sender, msg.value);
}
function withdraw(uint wad) public {
require(balanceOf[msg.sender] >= wad);
balanceOf[msg.sender] -= wad;
(bool sent,) = msg.sender.call{value: wad}("");
require(sent);
emit Withdrawal(msg.sender, wad);
}
function totalSupply() public view returns (uint) {
return address(this).balance;
}
function approve(address guy, uint wad) public returns (bool) {
allowance[msg.sender][guy] = wad;
emit Approval(msg.sender, guy, wad);
return true;
}
function transfer(address dst, uint wad) public returns (bool) {
return transferFrom(msg.sender, dst, wad);
}
function transferFrom(address src, address dst, uint wad)
public
returns (bool)
{
require(balanceOf[src] >= wad);
if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
require(allowance[src][msg.sender] >= wad);
allowance[src][msg.sender] -= wad;
}
balanceOf[src] -= wad;
balanceOf[dst] += wad;
emit Transfer(src, dst, wad);
return true;
}
}
/*
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
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To "convey" a work means any kind of propagation that enables other
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The Corresponding Source need not include anything that users
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.
*/

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src/interfaces/IERC20.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IERC20 {
event Approval(address indexed owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function decimals() external view returns (uint8);
function totalSupply() external view returns (uint256);
function balanceOf(address owner) external view returns (uint256);
function allowance(
address owner,
address spender
) external view returns (uint256);
function approve(address spender, uint256 value) external returns (bool);
function transfer(address to, uint256 value) external returns (bool);
function transferFrom(
address from,
address to,
uint256 value
) external returns (bool);
}

11
src/interfaces/IUniswapV2Callee.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IUniswapV2Callee {
function uniswapV2Call(
address sender,
uint256 amount0,
uint256 amount1,
bytes calldata data
) external;
}

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src/interfaces/IUniswapV2ERC20.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IUniswapV2ERC20 {
event Approval(address indexed owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint256);
function balanceOf(address owner) external view returns (uint256);
function allowance(address owner,address spender) external view returns (uint256);
function approve(address spender, uint256 value) external returns (bool);
function transfer(address to, uint256 value) external returns (bool);
function transferFrom(
address from,
address to,
uint256 value
) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint256);
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
}

17
src/interfaces/IUniswapV2Factory.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint256) external view returns (address pair);
function allPairsLength() external view returns (uint256);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}

46
src/interfaces/IUniswapV2Pair.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "./IUniswapV2ERC20.sol";
interface IUniswapV2Pair is IUniswapV2ERC20 {
event Mint(address indexed sender, uint256 amount0, uint256 amount1);
event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
event Swap(
address indexed sender,
uint256 amount0In,
uint256 amount1In,
uint256 amount0Out,
uint256 amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint256);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves()
external
view
returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint256);
function price1CumulativeLast() external view returns (uint256);
function kLast() external view returns (uint256);
function mint(address to) external returns (uint256 liquidity);
function burn(address to) external returns (uint256 amount0, uint256 amount1);
function swap(
uint256 amount0Out,
uint256 amount1Out,
address to,
bytes calldata data
) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}

51
src/interfaces/IUniswapV2Router.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import {IUniswapV2Router01} from "./IUniswapV2Router01.sol";
interface IUniswapV2Router is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external;
}

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src/interfaces/IUniswapV2Router01.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IUniswapV2Router01 {
function factory() external view returns (address);
function WETH() external view returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint256 amountADesired,
uint256 amountBDesired,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB, uint256 liquidity);
function addLiquidityETH(
address token,
uint256 amountTokenDesired,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
)
external
payable
returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETH(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline
) external returns (uint256 amountToken, uint256 amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint256 liquidity,
uint256 amountAMin,
uint256 amountBMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountA, uint256 amountB);
function removeLiquidityETHWithPermit(
address token,
uint256 liquidity,
uint256 amountTokenMin,
uint256 amountETHMin,
address to,
uint256 deadline,
bool approveMax,
uint8 v,
bytes32 r,
bytes32 s
) external returns (uint256 amountToken, uint256 amountETH);
function swapExactTokensForTokens(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapTokensForExactTokens(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactETHForTokens(
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function swapTokensForExactETH(
uint256 amountOut,
uint256 amountInMax,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapExactTokensForETH(
uint256 amountIn,
uint256 amountOutMin,
address[] calldata path,
address to,
uint256 deadline
) external returns (uint256[] memory amounts);
function swapETHForExactTokens(
uint256 amountOut,
address[] calldata path,
address to,
uint256 deadline
) external payable returns (uint256[] memory amounts);
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) external pure returns (uint256 amountB);
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountOut);
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) external pure returns (uint256 amountIn);
function getAmountsOut(
uint256 amountIn,
address[] calldata path
) external view returns (uint256[] memory amounts);
function getAmountsIn(
uint256 amountOut,
address[] calldata path
) external view returns (uint256[] memory amounts);
}

8
src/interfaces/IWETH.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
interface IWETH {
function deposit() external payable;
function withdraw(uint256) external;
function transfer(address to, uint256 value) external returns (bool);
}

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src/libraries/Math.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
library UniswapV2Math {
function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
z = x < y ? x : y;
}
// babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
function sqrt(uint256 y) internal pure returns (uint256 z) {
if (y > 3) {
z = y;
uint256 x = y / 2 + 1;
while (x < z) {
z = x;
x = (y / x + x) / 2;
}
} else if (y != 0) {
z = 1;
}
}
}

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src/libraries/TransferHelper.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
library TransferHelper {
function safeApprove(address token, address to, uint256 value) internal {
// bytes4(keccak256(bytes('approve(address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0x095ea7b3, to, value)
);
if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
revert("TransferHelper::safeApprove: approve failed");
}
}
function safeTransfer(address token, address to, uint256 value) internal {
// bytes4(keccak256(bytes('transfer(address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0xa9059cbb, to, value)
);
if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
revert("TransferHelper::safeTransfer: transfer failed");
}
}
function safeTransferFrom(
address token,
address from,
address to,
uint256 value
) internal {
// bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
(bool success, bytes memory data) = token.call(
abi.encodeWithSelector(0x23b872dd, from, to, value)
);
if (!success || (data.length > 0 && !abi.decode(data, (bool)))) {
revert("TransferHelper::transferFrom: transferFrom failed");
}
}
function safeTransferETH(address to, uint256 value) internal {
(bool success, ) = to.call{value: value}(new bytes(0));
if (!success) revert("TransferHelper::safeTransferETH: ETH transfer failed");
}
}

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src/libraries/UQ112x112.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
library UQ112x112 {
//solhint-disable-next-line state-visibility
uint224 constant Q112 = 2 ** 112;
// encode a uint112 as a UQ112x112
function encode(uint112 y) internal pure returns (uint224 z) {
z = uint224(y) * Q112; // never overflows
}
// divide a UQ112x112 by a uint112, returning a UQ112x112
function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
z = x / uint224(y);
}
}

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src/libraries/UniswapV2Library.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import "../interfaces/IUniswapV2Pair.sol";
library UniswapV2Library {
// returns sorted token addresses, used to handle return values from pairs sorted in this order
function sortTokens(
address tokenA,
address tokenB
) internal pure returns (address token0, address token1) {
if (tokenA == tokenB) revert("UniswapV2Library: IDENTICAL_ADDRESSES");
(token0, token1) = tokenA < tokenB
? (tokenA, tokenB)
: (tokenB, tokenA);
if (token0 == address(0)) revert("UniswapV2Library: ZERO_ADDRESS");
}
// calculates the CREATE2 address for a pair without making any external calls
function pairFor(
address factory,
address tokenA,
address tokenB
) internal pure returns (address pair) {
(address token0, address token1) = sortTokens(tokenA, tokenB);
pair = address(
uint160(
uint256(
keccak256(
abi.encodePacked(
bytes1(0xff),
factory,
keccak256(abi.encodePacked(token0, token1)),
// hex"443533a897cfad2762695078bf6ee9b78b4edcda64ec31e1c83066cee4c90a7e" // init code hash
// hex"7b5d0bf8129b1dafc6a0c5ca9822522c5c0c69ebc66d6af886ae16fa5b9db6ef" // init code hash
hex"2512d6f091a7cc78ba777ddd98c57630a8cbbf9e4afca50e51170141f5029973" // init code hash
)
)
)
)
);
}
// fetches and sorts the reserves for a pair
function getReserves(
address factory,
address tokenA,
address tokenB
) internal view returns (uint256 reserveA, uint256 reserveB) {
(address token0, ) = sortTokens(tokenA, tokenB);
(uint256 reserve0, uint256 reserve1, ) = IUniswapV2Pair(
pairFor(factory, tokenA, tokenB)
).getReserves();
(reserveA, reserveB) = tokenA == token0
? (reserve0, reserve1)
: (reserve1, reserve0);
}
// given some amount of an asset and pair reserves, returns an equivalent amount of the other asset
function quote(
uint256 amountA,
uint256 reserveA,
uint256 reserveB
) internal pure returns (uint256 amountB) {
if (amountA == 0) revert("UniswapV2Library: INSUFFICIENT_AMOUNT");
if (reserveA == 0 || reserveB == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
amountB = (amountA * reserveB) / reserveA;
}
// given an input amount of an asset and pair reserves, returns the maximum output amount of the other asset
function getAmountOut(
uint256 amountIn,
uint256 reserveIn,
uint256 reserveOut
) internal pure returns (uint256 amountOut) {
if (amountIn == 0) revert("UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
if (reserveIn == 0 || reserveOut == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
uint256 amountInWithFee = amountIn * 997;
uint256 numerator = amountInWithFee * reserveOut;
uint256 denominator = reserveIn * 1000 + amountInWithFee;
amountOut = numerator / denominator;
}
// given an output amount of an asset and pair reserves, returns a required input amount of the other asset
function getAmountIn(
uint256 amountOut,
uint256 reserveIn,
uint256 reserveOut
) internal pure returns (uint256 amountIn) {
if (amountOut == 0) revert("UniswapV2Library: INSUFFICIENT_OUTPUT_AMOUNT");
if (reserveIn == 0 || reserveOut == 0) revert("UniswapV2Library: INSUFFICIENT_LIQUIDITY");
uint256 numerator = reserveIn * amountOut * 1000;
uint256 denominator = (reserveOut - amountOut) * 997;
amountIn = numerator / denominator + 1;
}
// performs chained getAmountOut calculations on any number of pairs
function getAmountsOut(
address factory,
uint256 amountIn,
address[] memory path
) internal view returns (uint256[] memory amounts) {
if (path.length < 2) revert("UniswapV2Library: INVALID_PATH");
amounts = new uint256[](path.length);
amounts[0] = amountIn;
for (uint256 i; i < path.length - 1; i++) {
(uint256 reserveIn, uint256 reserveOut) = getReserves(
factory,
path[i],
path[i + 1]
);
amounts[i + 1] = getAmountOut(amounts[i], reserveIn, reserveOut);
}
}
// performs chained getAmountIn calculations on any number of pairs
function getAmountsIn(
address factory,
uint256 amountOut,
address[] memory path
) internal view returns (uint256[] memory amounts) {
if (path.length < 2) revert("UniswapV2Library: INVALID_PATH");
amounts = new uint256[](path.length);
amounts[amounts.length - 1] = amountOut;
for (uint256 i = path.length - 1; i > 0; i--) {
(uint256 reserveIn, uint256 reserveOut) = getReserves(
factory,
path[i - 1],
path[i]
);
amounts[i - 1] = getAmountIn(amounts[i], reserveIn, reserveOut);
}
}
}

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src/mock/MockERC20.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
contract MockERC20 {
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
event Approval(address indexed src, address indexed guy, uint256 wad);
event Transfer(address indexed src, address indexed dst, uint256 wad);
event Deposit(address indexed dst, uint256 wad);
event Withdrawal(address indexed src, uint256 wad);
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
constructor(string memory _name, string memory _symbol, uint8 _decimals) {
name = _name;
symbol = _symbol;
decimals = _decimals;
}
function mint(address guy, uint256 wad) public {
balanceOf[guy] += wad;
totalSupply += wad;
}
function approve(address guy, uint256 wad) public returns (bool) {
allowance[msg.sender][guy] = wad;
emit Approval(msg.sender, guy, wad);
return true;
}
function transfer(address dst, uint256 wad) public returns (bool) {
return transferFrom(msg.sender, dst, wad);
}
function transferFrom(address src, address dst, uint256 wad)
public
returns (bool)
{
require(balanceOf[src] >= wad);
if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
require(allowance[src][msg.sender] >= wad);
allowance[src][msg.sender] -= wad;
}
balanceOf[src] -= wad;
balanceOf[dst] += wad;
emit Transfer(src, dst, wad);
return true;
}
}

24
test/Counter.t.sol
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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
import {Test, console} from "forge-std/Test.sol";
import {Counter} from "../src/Counter.sol";
contract CounterTest is Test {
Counter public counter;
function setUp() public {
counter = new Counter();
counter.setNumber(0);
}
function test_Increment() public {
counter.increment();
assertEq(counter.number(), 1);
}
function testFuzz_SetNumber(uint256 x) public {
counter.setNumber(x);
assertEq(counter.number(), x);
}
}

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test/UniswapV2Factory.t.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import {Test} from "forge-std/Test.sol";
import "../src/UniswapV2Factory.sol";
import "../src/UniswapV2Pair.sol";
import "../src/mock/MockERC20.sol";
import "../src/libraries/UniswapV2Library.sol";
contract UniswapV2FactoryTest is Test {
UniswapV2Factory public factory;
MockERC20 public token0;
MockERC20 public token1;
MockERC20 public token2;
MockERC20 public token3;
function setUp() public {
factory = new UniswapV2Factory(address(0));
token0 = new MockERC20("SomeToken0", "ST0", 18);
token1 = new MockERC20("SomeToken1", "ST1", 18);
token2 = new MockERC20("SomeToken2", "ST2", 9);
token3 = new MockERC20("SomeToken3", "ST3", 6);
}
function testCreatePair() public {
address tokenPair = factory.createPair(address(token0), address(token1));
(address _token0, address _token1) = UniswapV2Library.sortTokens(
address(token0),
address(token1)
);
assertEq(factory.allPairsLength(), 1);
assertEq(factory.getPair(address(token0), address(token1)), tokenPair);
assertEq(UniswapV2Pair(tokenPair).token0(), _token0);
assertEq(UniswapV2Pair(tokenPair).token1(), _token1);
}
function testCreatePairMultipleTokens() public {
address tokenPair0 = factory.createPair(address(token0), address(token1));
address tokenPair1 = factory.createPair(address(token2), address(token3));
(address _token0, address _token1) = UniswapV2Library.sortTokens(address(token0), address(token1));
(address _token2, address _token3) = UniswapV2Library.sortTokens(address(token2), address(token3));
assertEq(factory.allPairsLength(), 2);
assertEq(factory.getPair(address(token0), address(token1)), tokenPair0);
assertEq(factory.getPair(address(token2), address(token3)), tokenPair1);
assertEq(UniswapV2Pair(tokenPair0).token0(), _token0);
assertEq(UniswapV2Pair(tokenPair0).token1(), _token1);
assertEq(UniswapV2Pair(tokenPair1).token0(), _token2);
assertEq(UniswapV2Pair(tokenPair1).token1(), _token3);
}
function testCreatePairChained() public {
address tokenPair0 = factory.createPair(address(token0), address(token1));
address tokenPair1 = factory.createPair(address(token1), address(token2));
address tokenPair2 = factory.createPair(address(token2), address(token3));
assertEq(factory.allPairsLength(), 3);
assertEq(factory.getPair(address(token0), address(token1)), tokenPair0);
assertEq(factory.getPair(address(token1), address(token2)), tokenPair1);
assertEq(factory.getPair(address(token2), address(token3)), tokenPair2);
}
function testCreatePairIdenticalTokens() public {
vm.expectRevert();
factory.createPair(address(token0), address(token0));
}
function testCreatePairInvalidToken() public {
vm.expectRevert();
factory.createPair(address(0), address(token1));
vm.expectRevert();
factory.createPair(address(token0), address(0));
}
function testCreatePairDuplicatePair() public {
factory.createPair(address(token0), address(token1));
vm.expectRevert();
factory.createPair(address(token0), address(token1));
}
}

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test/UniswapV2Pair.t.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import {Test} from "forge-std/Test.sol";
import "../src/mock/MockERC20.sol";
import "../src/UniswapV2Pair.sol";
import "../src/UniswapV2Factory.sol";
import "../src/libraries/UQ112x112.sol";
contract MockUser {
function addLiquidity(
address pair,
address _token0,
address _token1,
uint256 _amount0,
uint256 _amount1
) public returns (uint256) {
MockERC20(_token0).transfer(pair, _amount0);
MockERC20(_token1).transfer(pair, _amount1);
return UniswapV2Pair(pair).mint(address(this));
}
function removeLiquidity(address pair, uint256 liquidity)
public
returns (uint256, uint256)
{
UniswapV2Pair(pair).transfer(pair, liquidity);
return UniswapV2Pair(pair).burn(address(this));
}
}
contract TestUniswapV2Pair is Test {
MockERC20 public token0;
MockERC20 public token1;
UniswapV2Pair public pair;
UniswapV2Factory public factory;
MockUser public user;
function setUp() public {
token0 = new MockERC20("SomeToken0", "ST0", 18);
token1 = new MockERC20("SomeToken1", "ST1", 9);
factory = new UniswapV2Factory(address(0));
address tokenAddress = factory.createPair(address(token0), address(token1));
pair = UniswapV2Pair(tokenAddress);
// pair.initialize(address(token0), address(token1));
token0.mint(address(this), 10 ether);
token1.mint(address(this), 10 ether);
user = new MockUser();
token0.mint(address(user), 10 ether);
token1.mint(address(user), 10 ether);
}
function assertBlockTimestampLast(uint256 timestamp) public view {
(, , uint32 lastBlockTimestamp) = pair.getReserves();
assertEq(timestamp, lastBlockTimestamp);
}
function getCurrentMarginalPrices()
public
view
returns (uint256 price0, uint256 price1)
{
(uint112 reserve0, uint112 reserve1, ) = pair.getReserves();
price0 = reserve0 > 0
? uint256(UQ112x112.encode(reserve1)) / reserve0
: 0;
price1 = reserve1 > 0
? uint256(UQ112x112.encode(reserve0)) / reserve1
: 0;
}
function sortAmountsByTokens(uint256 amount0, uint256 amount1) public view returns (uint256, uint256) {
if (token0 < token1) {
return (amount0, amount1);
} else {
return (amount1, amount0);
}
}
function assertCumulativePrices(uint256 price0, uint256 price1) public view {
assertEq(
price0,
pair.price0CumulativeLast(),
"unexpected cumulative price 0"
);
assertEq(
price1,
pair.price1CumulativeLast(),
"unexpected cumulative price 1"
);
}
function assertPairReserves(uint256 _reserve0, uint256 _reserve1) public view {
(uint256 reserve0, uint256 reserve1,) = pair.getReserves();
// (reserve0, reserve1) = sortAmountsByTokens(reserve0, reserve1);
assertEq(reserve0, _reserve0);
assertEq(reserve1, _reserve1);
}
function testMintNewPair() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 liquidity = pair.mint(address(this));
assertPairReserves(1 ether, 1 ether);
assertEq(pair.balanceOf(address(0)), pair.MINIMUM_LIQUIDITY());
assertEq(pair.balanceOf(address(this)), liquidity);
assertEq(pair.totalSupply(), liquidity + pair.MINIMUM_LIQUIDITY());
}
function testMintWithReserve() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l1 = pair.mint(address(this));
token0.transfer(address(pair), 2 ether);
token1.transfer(address(pair), 2 ether);
uint256 l2 = pair.mint(address(this));
assertPairReserves(3 ether, 3 ether);
assertEq(pair.balanceOf(address(this)), l1 + l2);
assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
}
function testMintUnequalBalance() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l1 = pair.mint(address(this));
token0.transfer(address(pair), 4 ether);
token1.transfer(address(pair), 1 ether);
uint256 l2 = pair.mint(address(this));
assertPairReserves(2 ether, 5 ether);
assertEq(pair.balanceOf(address(this)), l1 + l2);
assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
}
function testMintArithmeticUnderflow() public {
// 0x11: Arithmetic over/underflow
vm.expectRevert();
pair.mint(address(this));
}
function testMintInsufficientLiquidity() public {
token0.transfer(address(pair), 1000);
token1.transfer(address(pair), 1000);
vm.expectRevert();
pair.mint(address(this));
}
function testMintMultipleUsers() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l1 = pair.mint(address(this));
uint256 l2 = user.addLiquidity(
address(pair),
address(token0),
address(token1),
2 ether,
3 ether
);
assertPairReserves(4 ether, 3 ether);
assertEq(pair.balanceOf(address(this)), l1);
assertEq(pair.balanceOf(address(user)), l2);
assertEq(pair.totalSupply(), l1 + l2 + pair.MINIMUM_LIQUIDITY());
}
function testBurn() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 liquidity = pair.mint(address(this));
pair.transfer(address(pair), liquidity);
pair.burn(address(this));
assertEq(pair.balanceOf(address(this)), 0);
assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
assertPairReserves(pair.MINIMUM_LIQUIDITY(), pair.MINIMUM_LIQUIDITY());
assertEq(
token0.balanceOf(address(this)),
10 ether - pair.MINIMUM_LIQUIDITY()
);
assertEq(
token1.balanceOf(address(this)),
10 ether - pair.MINIMUM_LIQUIDITY()
);
}
function testBurnUnequal() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l0 = pair.mint(address(this));
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 2 ether);
uint256 l1 = pair.mint(address(this));
pair.transfer(address(pair), l0 + l1);
(uint256 amount0, uint256 amount1) = pair.burn(address(this));
(amount0, amount1) = sortAmountsByTokens(amount0, amount1);
assertEq(pair.balanceOf(address(this)), 0);
assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
assertEq(token0.balanceOf(address(this)), 10 ether - 2 ether + amount0);
assertEq(token1.balanceOf(address(this)), 10 ether - 3 ether + amount1);
}
function testBurnNoLiquidity() public {
// 0x12: divide/modulo by zero
vm.expectRevert();
pair.burn(address(this));
}
function testBurnInsufficientLiquidityBurned() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
vm.expectRevert();
pair.burn(address(this));
}
function testBurnMultipleUsers() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l1 = pair.mint(address(this));
uint256 l2 = user.addLiquidity(
address(pair),
address(token0),
address(token1),
2 ether,
3 ether
);
pair.transfer(address(pair), l1);
(uint256 amount0, uint256 amount1) = pair.burn(address(this));
(amount0, amount1) = sortAmountsByTokens(amount0, amount1);
assertEq(pair.balanceOf(address(this)), 0);
assertEq(pair.balanceOf(address(user)), l2);
assertEq(pair.totalSupply(), l2 + pair.MINIMUM_LIQUIDITY());
assertPairReserves(4 ether - amount1, 3 ether - amount0);
assertEq(token0.balanceOf(address(this)), 10 ether - 1 ether + amount0);
assertEq(token1.balanceOf(address(this)), 10 ether - 1 ether + amount1);
}
function testBurnUnbalancedMultipleUsers() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
uint256 l1 = pair.mint(address(this));
uint256 l2 = user.addLiquidity(
address(pair),
address(token0),
address(token1),
2 ether,
3 ether
);
(uint256 a00, uint256 a01) = user.removeLiquidity(address(pair), l2);
(a00, a01) = sortAmountsByTokens(a00, a01);
pair.transfer(address(pair), l1);
(uint256 a10, uint256 a11) = pair.burn(address(this));
(a10, a11) = sortAmountsByTokens(a10, a11);
assertEq(pair.balanceOf(address(this)), 0);
assertEq(pair.balanceOf(address(user)), 0);
assertEq(pair.totalSupply(), pair.MINIMUM_LIQUIDITY());
// second user penalised for unbalanced liquidity, hence reserves unbalanced
assertPairReserves(
pair.MINIMUM_LIQUIDITY() * 4 / 3 + 1,
pair.MINIMUM_LIQUIDITY()
);
assertEq(token0.balanceOf(address(this)), 10 ether - 1 ether + a10);
assertEq(token1.balanceOf(address(this)), 10 ether - 1 ether + a11);
assertEq(token0.balanceOf(address(user)), 10 ether - 2 ether + a00);
assertEq(token1.balanceOf(address(user)), 10 ether - 3 ether + a01);
}
function testSwap() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
// transfer to maintain K
token1.transfer(address(pair), 1 ether);
pair.swap(0.5 ether, 0 ether, address(user), "");
assertPairReserves(1.5 ether, 1 ether);
assertEq(token1.balanceOf(address(user)), 10 ether + 0.5 ether);
}
function testSwapMultipleUserLiquidity() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
user.addLiquidity(
address(pair),
address(token0),
address(token1),
2 ether,
3 ether
);
// transfer to maintain K
token0.transfer(address(pair), 2 ether);
pair.swap(0 ether, 1 ether, address(user), "");
assertPairReserves(4 ether, 4 ether);
}
function testSwapUnderpriced() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
// transfer to maintain K
token1.transfer(address(pair), 1 ether);
pair.swap(0, 0.4 ether, address(user), "");
assertPairReserves(2 ether, 0.6 ether);
}
function testSwapInvalidAmount() public {
vm.expectRevert();
pair.swap(0 ether, 0 ether, address(user), "");
}
function testSwapInsufficientLiquidity() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
vm.expectRevert();
pair.swap(3 ether, 0 ether, address(user), "");
vm.expectRevert();
pair.swap(0 ether, 3 ether, address(user), "");
}
function testSwapSwapToSelf() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
vm.expectRevert();
pair.swap(1 ether, 0 ether, address(token0), "");
vm.expectRevert();
pair.swap(0 ether, 1 ether, address(token1), "");
}
function testSwapInvalidConstantProductFormula() public {
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
vm.expectRevert();
pair.swap(1 ether, 0 ether, address(user), "");
vm.expectRevert();
pair.swap(0 ether, 1 ether, address(user), "");
}
function testCumulativePrices() public {
vm.warp(0);
token0.transfer(address(pair), 1 ether);
token1.transfer(address(pair), 1 ether);
pair.mint(address(this));
pair.sync();
assertCumulativePrices(0, 0);
(
uint256 currentPrice0,
uint256 currentPrice1
) = getCurrentMarginalPrices();
vm.warp(1);
pair.sync();
assertBlockTimestampLast(1);
assertCumulativePrices(currentPrice0, currentPrice1);
vm.warp(2);
pair.sync();
assertBlockTimestampLast(2);
assertCumulativePrices(currentPrice0 * 2, currentPrice1 * 2);
vm.warp(3);
pair.sync();
assertBlockTimestampLast(3);
assertCumulativePrices(currentPrice0 * 3, currentPrice1 * 3);
user.addLiquidity(
address(pair),
address(token0),
address(token1),
2 ether,
3 ether
);
(uint256 newPrice0, uint256 newPrice1) = getCurrentMarginalPrices();
vm.warp(4);
pair.sync();
assertBlockTimestampLast(4);
assertCumulativePrices(
currentPrice0 * 3 + newPrice0,
currentPrice1 * 3 + newPrice1
);
vm.warp(5);
pair.sync();
assertBlockTimestampLast(5);
assertCumulativePrices(
currentPrice0 * 3 + newPrice0 * 2,
currentPrice1 * 3 + newPrice1 * 2
);
vm.warp(6);
pair.sync();
assertBlockTimestampLast(6);
assertCumulativePrices(
currentPrice0 * 3 + newPrice0 * 3,
currentPrice1 * 3 + newPrice1 * 3
);
}
}

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test/UniswapV2Router.t.sol Normal file
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// SPDX-License-Identifier: MIT
pragma solidity =0.8.20;
import {Test} from "forge-std/Test.sol";
import "../src/mock/MockERC20.sol";
import "../src/interfaces/IERC20.sol";
import "../src/UniswapV2Factory.sol";
import "../src/UniswapV2Router.sol";
import "../src/UniswapV2Pair.sol";
import "../src/WETH9.sol";
import "../src/libraries/UniswapV2Library.sol";
contract TestUniswapV2Router is Test {
UniswapV2Factory public factory;
UniswapV2Router public router;
MockERC20 public token0;
MockERC20 public token1;
WETH9 public weth;
function setUp() public {
weth = new WETH9();
factory = new UniswapV2Factory(address(0));
router = new UniswapV2Router(address(factory), address(weth));
token0 = new MockERC20("SomeToken0", "ST0", 18);
token1 = new MockERC20("SomeToken1", "ST1", 9);
token0.mint(address(this), 10 ether);
token1.mint(address(this), 10 ether);
}
function testAddLiquidityPairFor() public {
token0.approve(address(router), 10 ether);
token1.approve(address(router), 10 ether);
(address _token0, address _token1) = UniswapV2Library.sortTokens(
address(token0),
address(token1)
);
address pair = UniswapV2Library.pairFor(
address(factory),
_token0,
_token1
);
(, , uint256 liquidity) = router.addLiquidity(
address(token0),
address(token1),
1 ether,
1 ether,
1 ether,
1 ether,
address(this),
block.timestamp + 1
);
assertEq(liquidity, 1 ether - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
assertEq(factory.getPair(address(token0), address(token1)), pair);
}
function testAddLiquidityNoPair() public {
token0.approve(address(router), 10 ether);
token1.approve(address(router), 10 ether);
(address _token0, address _token1) = UniswapV2Library.sortTokens(
address(token0),
address(token1)
);
address pair = UniswapV2Library.pairFor(
address(factory),
_token0,
_token1
);
(uint256 amount0, uint256 amount1, uint256 liquidity) = router.addLiquidity(
address(token0),
address(token1),
1 ether,
1 ether,
1 ether,
1 ether,
address(this),
block.timestamp + 1
);
assertEq(amount0, 1 ether);
assertEq(amount1, 1 ether);
assertEq(liquidity, 1 ether - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
assertEq(factory.getPair(address(token0), address(token1)), pair);
assertEq(UniswapV2Pair(pair).token0(), address(token0));
assertEq(UniswapV2Pair(pair).token1(), address(token1));
(uint256 reserve0, uint256 reserve1, ) = UniswapV2Pair(pair).getReserves();
assertEq(reserve0, 1 ether);
assertEq(reserve1, 1 ether);
assertEq(token0.balanceOf(address(pair)), 1 ether);
assertEq(token1.balanceOf(address(pair)), 1 ether);
assertEq(token0.balanceOf(address(this)), 9 ether);
assertEq(token1.balanceOf(address(this)), 9 ether);
}
function testAddLiquidityInsufficientAmountB() public {
token0.approve(address(router), 4 ether);
token1.approve(address(router), 8 ether);
router.addLiquidity(
address(token0),
address(token1),
4 ether,
8 ether,
4 ether,
8 ether,
address(this),
block.timestamp + 1
);
token0.approve(address(router), 1 ether);
token1.approve(address(router), 2 ether);
vm.expectRevert();
router.addLiquidity(
address(token0),
address(token1),
1 ether,
2 ether,
1 ether,
2.3 ether,
address(this),
block.timestamp + 1
);
}
function testAddLiquidityAmountBDesiredHigh() public {
token0.approve(address(router), 4 ether);
token1.approve(address(router), 8 ether);
router.addLiquidity(
address(token0),
address(token1),
4 ether,
8 ether,
4 ether,
8 ether,
address(this),
block.timestamp + 1
);
token0.approve(address(router), 1 ether);
token1.approve(address(router), 2 ether);
(uint256 amount0, uint256 amount1, ) = router.addLiquidity(
address(token0),
address(token1),
1 ether,
2.3 ether,
1 ether,
2 ether,
address(this),
block.timestamp + 1
);
assertEq(amount0, 1 ether);
assertEq(amount1, 2 ether);
}
function testAddLiquidityAmountBDesiredLow() public {
token0.approve(address(router), 4 ether);
token1.approve(address(router), 8 ether);
router.addLiquidity(
address(token0),
address(token1),
4 ether,
8 ether,
4 ether,
8 ether,
address(this),
block.timestamp + 1
);
token0.approve(address(router), 1 ether);
token1.approve(address(router), 2 ether);
(uint256 amount0, uint256 amount1, ) = router.addLiquidity(
address(token0),
address(token1),
1 ether,
1.5 ether,
0.75 ether,
2 ether,
address(this),
block.timestamp + 1
);
assertEq(amount0, 0.75 ether);
assertEq(amount1, 1.5 ether);
}
function testAddLiquidityInsufficientAmountA() public {
token0.approve(address(router), 4 ether);
token1.approve(address(router), 8 ether);
router.addLiquidity(
address(token0),
address(token1),
4 ether,
8 ether,
4 ether,
8 ether,
address(this),
block.timestamp + 1
);
token0.approve(address(router), 1 ether);
token1.approve(address(router), 2 ether);
vm.expectRevert();
router.addLiquidity(
address(token0),
address(token1),
1 ether,
1.5 ether,
1 ether,
2 ether,
address(this),
block.timestamp + 1
);
}
function testAddLiquidityExpired() public {
token0.approve(address(router), 1 ether);
token1.approve(address(router), 1 ether);
vm.warp(2);
vm.expectRevert();
router.addLiquidity(
address(token0),
address(token1),
1 ether,
1 ether,
1 ether,
1 ether,
address(this),
1
);
}
function testRemoveLiquidity() public {
token0.approve(address(router), 1 ether);
token1.approve(address(router), 1 ether);
(uint256 amount0, uint256 amount1, uint256 liquidity) = router.addLiquidity(
address(token0),
address(token1),
1 ether,
1 ether,
1 ether,
1 ether,
address(this),
block.timestamp + 1
);
uint256 prevAmount0 = token0.balanceOf(address(this));
uint256 prevAmount1 = token1.balanceOf(address(this));
address pair = factory.getPair(address(token0), address(token1));
assertEq(IERC20(pair).balanceOf(address(this)), liquidity);
IERC20(pair).approve(address(router), liquidity);
router.removeLiquidity(
address(token0),
address(token1),
liquidity,
0,
0,
address(this),
block.timestamp + 1
);
UniswapV2Pair(pair).skim(address(this));
assertEq(IERC20(pair).balanceOf(address(this)), 0);
assertEq(token0.balanceOf(address(this)), prevAmount0 + amount0 - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
assertEq(token1.balanceOf(address(this)), prevAmount1 + amount1 - UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
assertEq(token0.balanceOf(pair), UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
assertEq(token1.balanceOf(pair), UniswapV2Pair(pair).MINIMUM_LIQUIDITY());
}
}