Contract Name:
AggregationRouterV3
Contract Source Code:
File 1 of 1 : AggregationRouterV3
/**
*Submitted for verification at Etherscan.io on 2021-03-11
*/
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*/
// File @openzeppelin/contracts/utils/[email protected]
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.8.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File @openzeppelin/contracts/access/[email protected]
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File @openzeppelin/contracts/math/[email protected]
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b > a) return (false, 0);
return (true, a - b);
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a / b);
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
if (b == 0) return (false, 0);
return (true, a % b);
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SafeMath: subtraction overflow");
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) return 0;
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: division by zero");
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "SafeMath: modulo by zero");
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
return a - b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryDiv}.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
return a % b;
}
}
// File @openzeppelin/contracts/utils/[email protected]
pragma solidity >=0.6.2 <0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
pragma solidity >=0.6.0 <0.8.0;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File contracts/helpers/UniERC20.sol
pragma solidity ^0.6.12;
library UniERC20 {
using SafeMath for uint256;
IERC20 private constant _ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
IERC20 private constant _ZERO_ADDRESS = IERC20(0);
function isETH(IERC20 token) internal pure returns (bool) {
return (token == _ZERO_ADDRESS || token == _ETH_ADDRESS);
}
function uniBalanceOf(IERC20 token, address account) internal view returns (uint256) {
if (isETH(token)) {
return account.balance;
} else {
return token.balanceOf(account);
}
}
function uniTransfer(IERC20 token, address payable to, uint256 amount) internal {
if (amount > 0) {
if (isETH(token)) {
to.transfer(amount);
} else {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, amount));
}
}
}
function uniApprove(IERC20 token, address to, uint256 amount) internal {
require(!isETH(token), "Approve called on ETH");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(abi.encodeWithSelector(token.approve.selector, to, amount));
if (!success || (returndata.length > 0 && !abi.decode(returndata, (bool)))) {
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, to, 0));
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, to, amount));
}
}
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "low-level call failed");
if (returndata.length > 0) { // Return data is optional
require(abi.decode(returndata, (bool)), "ERC20 operation did not succeed");
}
}
}
// File contracts/interfaces/IChi.sol
pragma solidity ^0.6.12;
interface IChi is IERC20 {
function mint(uint256 value) external;
function free(uint256 value) external returns (uint256 freed);
function freeFromUpTo(address from, uint256 value) external returns (uint256 freed);
}
// File contracts/interfaces/IGasDiscountExtension.sol
pragma solidity ^0.6.12;
interface IGasDiscountExtension {
function calculateGas(uint256 gasUsed, uint256 flags, uint256 calldataLength) external view returns (IChi, uint256);
}
// File contracts/interfaces/IAggregationExecutor.sol
pragma solidity ^0.6.12;
interface IAggregationExecutor is IGasDiscountExtension {
function callBytes(bytes calldata data) external payable; // 0xd9c45357
}
// File contracts/helpers/RevertReasonParser.sol
pragma solidity ^0.6.12;
library RevertReasonParser {
function parse(bytes memory data, string memory prefix) internal pure returns (string memory) {
// https://solidity.readthedocs.io/en/latest/control-structures.html#revert
// We assume that revert reason is abi-encoded as Error(string)
// 68 = 4-byte selector 0x08c379a0 + 32 bytes offset + 32 bytes length
if (data.length >= 68 && data[0] == "\x08" && data[1] == "\xc3" && data[2] == "\x79" && data[3] == "\xa0") {
string memory reason;
// solhint-disable no-inline-assembly
assembly {
// 68 = 32 bytes data length + 4-byte selector + 32 bytes offset
reason := add(data, 68)
}
/*
revert reason is padded up to 32 bytes with ABI encoder: Error(string)
also sometimes there is extra 32 bytes of zeros padded in the end:
https://github.com/ethereum/solidity/issues/10170
because of that we can't check for equality and instead check
that string length + extra 68 bytes is less than overall data length
*/
require(data.length >= 68 + bytes(reason).length, "Invalid revert reason");
return string(abi.encodePacked(prefix, "Error(", reason, ")"));
}
// 36 = 4-byte selector 0x4e487b71 + 32 bytes integer
else if (data.length == 36 && data[0] == "\x4e" && data[1] == "\x48" && data[2] == "\x7b" && data[3] == "\x71") {
uint256 code;
// solhint-disable no-inline-assembly
assembly {
// 36 = 32 bytes data length + 4-byte selector
code := mload(add(data, 36))
}
return string(abi.encodePacked(prefix, "Panic(", _toHex(code), ")"));
}
return string(abi.encodePacked(prefix, "Unknown(", _toHex(data), ")"));
}
function _toHex(uint256 value) private pure returns(string memory) {
return _toHex(abi.encodePacked(value));
}
function _toHex(bytes memory data) private pure returns(string memory) {
bytes16 alphabet = 0x30313233343536373839616263646566;
bytes memory str = new bytes(2 + data.length * 2);
str[0] = "0";
str[1] = "x";
for (uint256 i = 0; i < data.length; i++) {
str[2 * i + 2] = alphabet[uint8(data[i] >> 4)];
str[2 * i + 3] = alphabet[uint8(data[i] & 0x0f)];
}
return string(str);
}
}
// File contracts/interfaces/IERC20Permit.sol
pragma solidity ^0.6.12;
interface IERC20Permit {
function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;
}
// File contracts/helpers/Permitable.sol
pragma solidity ^0.6.12;
contract Permitable {
event Error(
string reason
);
function _permit(IERC20 token, uint256 amount, bytes calldata permit) internal {
if (permit.length == 32 * 7) {
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory result) = address(token).call(abi.encodePacked(IERC20Permit.permit.selector, permit));
if (!success) {
string memory reason = RevertReasonParser.parse(result, "Permit call failed: ");
if (token.allowance(msg.sender, address(this)) < amount) {
revert(reason);
} else {
emit Error(reason);
}
}
}
}
}
// File contracts/UnoswapRouter.sol
pragma solidity ^0.6.12;
contract UnoswapRouter is Permitable {
uint256 private constant _TRANSFER_FROM_CALL_SELECTOR_32 = 0x23b872dd00000000000000000000000000000000000000000000000000000000;
uint256 private constant _WETH_DEPOSIT_CALL_SELECTOR_32 = 0xd0e30db000000000000000000000000000000000000000000000000000000000;
uint256 private constant _WETH_WITHDRAW_CALL_SELECTOR_32 = 0x2e1a7d4d00000000000000000000000000000000000000000000000000000000;
uint256 private constant _ERC20_TRANSFER_CALL_SELECTOR_32 = 0xa9059cbb00000000000000000000000000000000000000000000000000000000;
uint256 private constant _ADDRESS_MASK = 0x000000000000000000000000ffffffffffffffffffffffffffffffffffffffff;
uint256 private constant _REVERSE_MASK = 0x8000000000000000000000000000000000000000000000000000000000000000;
uint256 private constant _WETH_MASK = 0x4000000000000000000000000000000000000000000000000000000000000000;
uint256 private constant _NUMERATOR_MASK = 0x0000000000000000ffffffff0000000000000000000000000000000000000000;
uint256 private constant _WETH = 0x000000000000000000000000C02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
uint256 private constant _UNISWAP_PAIR_RESERVES_CALL_SELECTOR_32 = 0x0902f1ac00000000000000000000000000000000000000000000000000000000;
uint256 private constant _UNISWAP_PAIR_SWAP_CALL_SELECTOR_32 = 0x022c0d9f00000000000000000000000000000000000000000000000000000000;
uint256 private constant _DENOMINATOR = 1000000000;
uint256 private constant _NUMERATOR_OFFSET = 160;
receive() external payable {
// solhint-disable-next-line avoid-tx-origin
require(msg.sender != tx.origin, "ETH deposit rejected");
}
function unoswapWithPermit(
IERC20 srcToken,
uint256 amount,
uint256 minReturn,
bytes32[] calldata pools,
bytes calldata permit
) external payable returns(uint256 returnAmount) {
_permit(srcToken, amount, permit);
return unoswap(srcToken, amount, minReturn, pools);
}
function unoswap(
IERC20 srcToken,
uint256 amount,
uint256 minReturn,
bytes32[] calldata /* pools */
) public payable returns(uint256 returnAmount) {
assembly { // solhint-disable-line no-inline-assembly
function reRevert() {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
function revertWithReason(m, len) {
mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
mstore(0x20, 0x0000002000000000000000000000000000000000000000000000000000000000)
mstore(0x40, m)
revert(0, len)
}
function swap(emptyPtr, swapAmount, pair, reversed, numerator, dst) -> ret {
mstore(emptyPtr, _UNISWAP_PAIR_RESERVES_CALL_SELECTOR_32)
if iszero(staticcall(gas(), pair, emptyPtr, 0x4, emptyPtr, 0x40)) {
reRevert()
}
let reserve0 := mload(emptyPtr)
let reserve1 := mload(add(emptyPtr, 0x20))
if reversed {
let tmp := reserve0
reserve0 := reserve1
reserve1 := tmp
}
ret := mul(swapAmount, numerator)
ret := div(mul(ret, reserve1), add(ret, mul(reserve0, _DENOMINATOR)))
mstore(emptyPtr, _UNISWAP_PAIR_SWAP_CALL_SELECTOR_32)
switch reversed
case 0 {
mstore(add(emptyPtr, 0x04), 0)
mstore(add(emptyPtr, 0x24), ret)
}
default {
mstore(add(emptyPtr, 0x04), ret)
mstore(add(emptyPtr, 0x24), 0)
}
mstore(add(emptyPtr, 0x44), dst)
mstore(add(emptyPtr, 0x64), 0x80)
mstore(add(emptyPtr, 0x84), 0)
if iszero(call(gas(), pair, 0, emptyPtr, 0xa4, 0, 0)) {
reRevert()
}
}
let emptyPtr := mload(0x40)
mstore(0x40, add(emptyPtr, 0xc0))
let poolsOffset := add(calldataload(0x64), 0x4)
let poolsEndOffset := calldataload(poolsOffset)
poolsOffset := add(poolsOffset, 0x20)
poolsEndOffset := add(poolsOffset, mul(0x20, poolsEndOffset))
let rawPair := calldataload(poolsOffset)
switch srcToken
case 0 {
if iszero(eq(amount, callvalue())) {
revertWithReason(0x00000011696e76616c6964206d73672e76616c75650000000000000000000000, 0x55) // "invalid msg.value"
}
mstore(emptyPtr, _WETH_DEPOSIT_CALL_SELECTOR_32)
if iszero(call(gas(), _WETH, amount, emptyPtr, 0x4, 0, 0)) {
reRevert()
}
mstore(emptyPtr, _ERC20_TRANSFER_CALL_SELECTOR_32)
mstore(add(emptyPtr, 0x4), and(rawPair, _ADDRESS_MASK))
mstore(add(emptyPtr, 0x24), amount)
if iszero(call(gas(), _WETH, 0, emptyPtr, 0x44, 0, 0)) {
reRevert()
}
}
default {
if callvalue() {
revertWithReason(0x00000011696e76616c6964206d73672e76616c75650000000000000000000000, 0x55) // "invalid msg.value"
}
mstore(emptyPtr, _TRANSFER_FROM_CALL_SELECTOR_32)
mstore(add(emptyPtr, 0x4), caller())
mstore(add(emptyPtr, 0x24), and(rawPair, _ADDRESS_MASK))
mstore(add(emptyPtr, 0x44), amount)
if iszero(call(gas(), srcToken, 0, emptyPtr, 0x64, 0, 0)) {
reRevert()
}
}
returnAmount := amount
for {let i := add(poolsOffset, 0x20)} lt(i, poolsEndOffset) {i := add(i, 0x20)} {
let nextRawPair := calldataload(i)
returnAmount := swap(
emptyPtr,
returnAmount,
and(rawPair, _ADDRESS_MASK),
and(rawPair, _REVERSE_MASK),
shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
and(nextRawPair, _ADDRESS_MASK)
)
rawPair := nextRawPair
}
switch and(rawPair, _WETH_MASK)
case 0 {
returnAmount := swap(
emptyPtr,
returnAmount,
and(rawPair, _ADDRESS_MASK),
and(rawPair, _REVERSE_MASK),
shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
caller()
)
}
default {
returnAmount := swap(
emptyPtr,
returnAmount,
and(rawPair, _ADDRESS_MASK),
and(rawPair, _REVERSE_MASK),
shr(_NUMERATOR_OFFSET, and(rawPair, _NUMERATOR_MASK)),
address()
)
mstore(emptyPtr, _WETH_WITHDRAW_CALL_SELECTOR_32)
mstore(add(emptyPtr, 0x04), returnAmount)
if iszero(call(gas(), _WETH, 0, emptyPtr, 0x24, 0, 0)) {
reRevert()
}
if iszero(call(gas(), caller(), returnAmount, 0, 0, 0, 0)) {
reRevert()
}
}
if lt(returnAmount, minReturn) {
revertWithReason(0x000000164d696e2072657475726e206e6f742072656163686564000000000000, 0x5a) // "Min return not reached"
}
}
}
}
// File contracts/AggregationRouterV3.sol
pragma solidity ^0.6.12;
pragma experimental ABIEncoderV2;
contract AggregationRouterV3 is Ownable, UnoswapRouter {
using SafeMath for uint256;
using SafeERC20 for IERC20;
using UniERC20 for IERC20;
uint256 private constant _PARTIAL_FILL = 0x01;
uint256 private constant _REQUIRES_EXTRA_ETH = 0x02;
uint256 private constant _SHOULD_CLAIM = 0x04;
uint256 private constant _BURN_FROM_MSG_SENDER = 0x08;
uint256 private constant _BURN_FROM_TX_ORIGIN = 0x10;
struct SwapDescription {
IERC20 srcToken;
IERC20 dstToken;
address srcReceiver;
address dstReceiver;
uint256 amount;
uint256 minReturnAmount;
uint256 flags;
bytes permit;
}
event Swapped(
address sender,
IERC20 srcToken,
IERC20 dstToken,
address dstReceiver,
uint256 spentAmount,
uint256 returnAmount
);
function discountedSwap(
IAggregationExecutor caller,
SwapDescription calldata desc,
bytes calldata data
)
external
payable
returns (uint256 returnAmount, uint256 gasLeft, uint256 chiSpent)
{
uint256 initialGas = gasleft();
address chiSource = address(0);
if (desc.flags & _BURN_FROM_MSG_SENDER != 0) {
chiSource = msg.sender;
} else if (desc.flags & _BURN_FROM_TX_ORIGIN != 0) {
chiSource = tx.origin; // solhint-disable-line avoid-tx-origin
} else {
revert("Incorrect CHI burn flags");
}
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returnData) = address(this).delegatecall(abi.encodeWithSelector(this.swap.selector, caller, desc, data));
if (success) {
(returnAmount,) = abi.decode(returnData, (uint256, uint256));
} else {
if (msg.value > 0) {
msg.sender.transfer(msg.value);
}
emit Error(RevertReasonParser.parse(returnData, "Swap failed: "));
}
(IChi chi, uint256 amount) = caller.calculateGas(initialGas.sub(gasleft()), desc.flags, msg.data.length);
if (amount > 0) {
chiSpent = chi.freeFromUpTo(chiSource, amount);
}
gasLeft = gasleft();
}
function swap(
IAggregationExecutor caller,
SwapDescription calldata desc,
bytes calldata data
)
external
payable
returns (uint256 returnAmount, uint256 gasLeft)
{
require(desc.minReturnAmount > 0, "Min return should not be 0");
require(data.length > 0, "data should be not zero");
uint256 flags = desc.flags;
IERC20 srcToken = desc.srcToken;
IERC20 dstToken = desc.dstToken;
if (flags & _REQUIRES_EXTRA_ETH != 0) {
require(msg.value > (srcToken.isETH() ? desc.amount : 0), "Invalid msg.value");
} else {
require(msg.value == (srcToken.isETH() ? desc.amount : 0), "Invalid msg.value");
}
if (flags & _SHOULD_CLAIM != 0) {
require(!srcToken.isETH(), "Claim token is ETH");
_permit(srcToken, desc.amount, desc.permit);
srcToken.safeTransferFrom(msg.sender, desc.srcReceiver, desc.amount);
}
address dstReceiver = (desc.dstReceiver == address(0)) ? msg.sender : desc.dstReceiver;
uint256 initialSrcBalance = (flags & _PARTIAL_FILL != 0) ? srcToken.uniBalanceOf(msg.sender) : 0;
uint256 initialDstBalance = dstToken.uniBalanceOf(dstReceiver);
{
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory result) = address(caller).call{value: msg.value}(abi.encodePacked(caller.callBytes.selector, data));
if (!success) {
revert(RevertReasonParser.parse(result, "callBytes failed: "));
}
}
uint256 spentAmount = desc.amount;
returnAmount = dstToken.uniBalanceOf(dstReceiver).sub(initialDstBalance);
if (flags & _PARTIAL_FILL != 0) {
spentAmount = initialSrcBalance.add(desc.amount).sub(srcToken.uniBalanceOf(msg.sender));
require(returnAmount.mul(desc.amount) >= desc.minReturnAmount.mul(spentAmount), "Return amount is not enough");
} else {
require(returnAmount >= desc.minReturnAmount, "Return amount is not enough");
}
emit Swapped(
msg.sender,
srcToken,
dstToken,
dstReceiver,
spentAmount,
returnAmount
);
gasLeft = gasleft();
}
function rescueFunds(IERC20 token, uint256 amount) external onlyOwner {
token.uniTransfer(msg.sender, amount);
}
function destroy() external onlyOwner {
selfdestruct(msg.sender);
}
}