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| // SPDX-License-Identifier: GPL-2.0-or-later | ||
| /* | ||
| * @title Solidity Bytes Arrays Utils | ||
| * @author Gonçalo Sá <[email protected]> | ||
| * | ||
| * @dev Bytes tightly packed arrays utility library for ethereum contracts written in Solidity. | ||
| * The library lets you concatenate, slice and type cast bytes arrays both in memory and storage. | ||
| */ | ||
| pragma solidity 0.8.12; | ||
|
|
||
| library BytesLib { | ||
| function slice( | ||
| bytes memory _bytes, | ||
| uint256 _start, | ||
| uint256 _length | ||
| ) internal pure returns (bytes memory) { | ||
| require(_length + 31 >= _length, "slice_overflow"); | ||
| require(_start + _length >= _start, "slice_overflow"); | ||
| require(_bytes.length >= _start + _length, "slice_outOfBounds"); | ||
|
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| bytes memory tempBytes; | ||
|
|
||
| assembly { | ||
| switch iszero(_length) | ||
| case 0 { | ||
| // Get a location of some free memory and store it in tempBytes as | ||
| // Solidity does for memory variables. | ||
| tempBytes := mload(0x40) | ||
|
|
||
| // The first word of the slice result is potentially a partial | ||
| // word read from the original array. To read it, we calculate | ||
| // the length of that partial word and start copying that many | ||
| // bytes into the array. The first word we copy will start with | ||
| // data we don't care about, but the last `lengthmod` bytes will | ||
| // land at the beginning of the contents of the new array. When | ||
| // we're done copying, we overwrite the full first word with | ||
| // the actual length of the slice. | ||
| let lengthmod := and(_length, 31) | ||
|
|
||
| // The multiplication in the next line is necessary | ||
| // because when slicing multiples of 32 bytes (lengthmod == 0) | ||
| // the following copy loop was copying the origin's length | ||
| // and then ending prematurely not copying everything it should. | ||
| let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod))) | ||
| let end := add(mc, _length) | ||
|
|
||
| for { | ||
| // The multiplication in the next line has the same exact purpose | ||
| // as the one above. | ||
| let cc := add( | ||
| add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), | ||
| _start | ||
| ) | ||
| } lt(mc, end) { | ||
| mc := add(mc, 0x20) | ||
| cc := add(cc, 0x20) | ||
| } { | ||
| mstore(mc, mload(cc)) | ||
| } | ||
|
|
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| mstore(tempBytes, _length) | ||
|
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| //update free-memory pointer | ||
| //allocating the array padded to 32 bytes like the compiler does now | ||
| mstore(0x40, and(add(mc, 31), not(31))) | ||
| } | ||
| //if we want a zero-length slice let's just return a zero-length array | ||
| default { | ||
| tempBytes := mload(0x40) | ||
| //zero out the 32 bytes slice we are about to return | ||
| //we need to do it because Solidity does not garbage collect | ||
| mstore(tempBytes, 0) | ||
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| mstore(0x40, add(tempBytes, 0x20)) | ||
| } | ||
| } | ||
|
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| return tempBytes; | ||
| } | ||
|
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| function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address) { | ||
| require(_start + 20 >= _start, "toAddress_overflow"); | ||
| require(_bytes.length >= _start + 20, "toAddress_outOfBounds"); | ||
| address tempAddress; | ||
|
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| assembly { | ||
| tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000) | ||
| } | ||
|
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| return tempAddress; | ||
| } | ||
|
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| function toUint24(bytes memory _bytes, uint256 _start) internal pure returns (uint24) { | ||
| require(_start + 3 >= _start, "toUint24_overflow"); | ||
| require(_bytes.length >= _start + 3, "toUint24_outOfBounds"); | ||
| uint24 tempUint; | ||
|
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| assembly { | ||
| tempUint := mload(add(add(_bytes, 0x3), _start)) | ||
| } | ||
|
|
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| return tempUint; | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,35 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
| pragma solidity 0.8.12; | ||
|
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| import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol"; | ||
|
Check warning on line 4 in contracts/callers/helpers/uniswap/CallbackValidation.sol
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| import "./PoolAddress.sol"; | ||
|
Check warning on line 5 in contracts/callers/helpers/uniswap/CallbackValidation.sol
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| /// @notice Provides validation for callbacks from Uniswap V3 Pools | ||
| library CallbackValidation { | ||
| /// @notice Returns the address of a valid Uniswap V3 Pool | ||
| /// @param factory The contract address of the Uniswap V3 factory | ||
| /// @param tokenA The contract address of either token0 or token1 | ||
| /// @param tokenB The contract address of the other token | ||
| /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip | ||
| /// @return pool The V3 pool contract address | ||
| function verifyCallback( | ||
| address factory, | ||
| address tokenA, | ||
| address tokenB, | ||
| uint24 fee | ||
| ) internal view returns (IUniswapV3Pool pool) { | ||
| return verifyCallback(factory, PoolAddress.getPoolKey(tokenA, tokenB, fee)); | ||
| } | ||
|
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| /// @notice Returns the address of a valid Uniswap V3 Pool | ||
| /// @param factory The contract address of the Uniswap V3 factory | ||
| /// @param poolKey The identifying key of the V3 pool | ||
| /// @return pool The V3 pool contract address | ||
| function verifyCallback( | ||
| address factory, | ||
| PoolAddress.PoolKey memory poolKey | ||
| ) internal view returns (IUniswapV3Pool pool) { | ||
| pool = IUniswapV3Pool(PoolAddress.computeAddress(factory, poolKey)); | ||
| require(msg.sender == address(pool)); | ||
| } | ||
| } | ||
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| @@ -0,0 +1,30 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
| pragma solidity 0.8.12; | ||
|
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| import "./BytesLib.sol"; | ||
|
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| /// @title Functions for manipulating path data for multihop swaps | ||
| library Path { | ||
| using BytesLib for bytes; | ||
|
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| /// @dev The length of the bytes encoded address | ||
| uint256 private constant ADDR_SIZE = 20; | ||
| /// @dev The length of the bytes encoded fee | ||
| uint256 private constant FEE_SIZE = 3; | ||
|
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| /// @dev The offset of a single token address and pool fee | ||
| uint256 private constant NEXT_OFFSET = ADDR_SIZE + FEE_SIZE; | ||
|
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| /// @notice Decodes the first pool in path | ||
| /// @param path The bytes encoded swap path | ||
| /// @return tokenA The first token of the given pool | ||
| /// @return tokenB The second token of the given pool | ||
| /// @return fee The fee level of the pool | ||
| function decodeFirstPool( | ||
| bytes memory path | ||
| ) internal pure returns (address tokenA, address tokenB, uint24 fee) { | ||
| tokenA = path.toAddress(0); | ||
| fee = path.toUint24(ADDR_SIZE); | ||
| tokenB = path.toAddress(NEXT_OFFSET); | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| // SPDX-License-Identifier: GPL-2.0-or-later | ||
| pragma solidity 0.8.12; | ||
|
|
||
| /// @title Provides functions for deriving a pool address from the factory, tokens, and the fee | ||
| library PoolAddress { | ||
| bytes32 internal constant POOL_INIT_CODE_HASH = | ||
| 0xe34f199b19b2b4f47f68442619d555527d244f78a3297ea89325f843f87b8b54; | ||
|
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| /// @notice The identifying key of the pool | ||
| struct PoolKey { | ||
| address token0; | ||
| address token1; | ||
| uint24 fee; | ||
| } | ||
|
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| /// @notice Returns PoolKey: the ordered tokens with the matched fee levels | ||
| /// @param tokenA The first token of a pool, unsorted | ||
| /// @param tokenB The second token of a pool, unsorted | ||
| /// @param fee The fee level of the pool | ||
| /// @return Poolkey The pool details with ordered token0 and token1 assignments | ||
| function getPoolKey( | ||
| address tokenA, | ||
| address tokenB, | ||
| uint24 fee | ||
| ) internal pure returns (PoolKey memory) { | ||
| if (tokenA > tokenB) (tokenA, tokenB) = (tokenB, tokenA); | ||
| return PoolKey({ token0: tokenA, token1: tokenB, fee: fee }); | ||
| } | ||
|
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| /// @notice Deterministically computes the pool address given the factory and PoolKey | ||
| /// @param factory The Uniswap V3 factory contract address | ||
| /// @param key The PoolKey | ||
| /// @return pool The contract address of the V3 pool | ||
| function computeAddress( | ||
| address factory, | ||
| PoolKey memory key | ||
| ) internal pure returns (address pool) { | ||
| require(key.token0 < key.token1); | ||
| pool = address( | ||
| uint160( | ||
| uint256( | ||
| keccak256( | ||
| abi.encodePacked( | ||
| hex"ff", | ||
| factory, | ||
| keccak256(abi.encode(key.token0, key.token1, key.fee)), | ||
| POOL_INIT_CODE_HASH | ||
| ) | ||
| ) | ||
| ) | ||
| ) | ||
| ); | ||
| } | ||
| } | ||
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