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feat: initial commit for wtf-contract v2

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2026-08-30 23:16:04 +08:00
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main/lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol
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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)
pragma solidity >=0.4.16;
/**
* @dev Interface of the ERC-20 standard as defined in the ERC.
*/
interface IERC20 {
/**
* @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);
/**
* @dev Returns the value of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the value of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves a `value` amount of tokens from the caller's account to `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, uint256 value) 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 a `value` amount of tokens 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 value) external returns (bool);
/**
* @dev Moves a `value` amount of tokens from `from` to `to` using the
* allowance mechanism. `value` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 value) external returns (bool);
}
main/lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol
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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)
pragma solidity >=0.6.2;
import {IERC20} from "../IERC20.sol";
/**
* @dev Interface for the optional metadata functions from the ERC-20 standard.
*/
interface IERC20Metadata is IERC20 {
/**
* @dev Returns the name of the token.
*/
function name() external view returns (string memory);
/**
* @dev Returns the symbol of the token.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the decimals places of the token.
*/
function decimals() external view returns (uint8);
}
main/lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol
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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.5.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.20;
import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC-20 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 {
/**
* @dev An operation with an ERC-20 token failed.
*/
error SafeERC20FailedOperation(address token);
/**
* @dev Indicates a failed `decreaseAllowance` request.
*/
error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);
/**
* @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*/
function safeTransfer(IERC20 token, address to, uint256 value) internal {
if (!_safeTransfer(token, to, value, true)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
* calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
*/
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
if (!_safeTransferFrom(token, from, to, value, true)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
return _safeTransfer(token, to, value, false);
}
/**
* @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
*/
function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
return _safeTransferFrom(token, from, to, value, false);
}
/**
* @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 oldAllowance = token.allowance(address(this), spender);
forceApprove(token, spender, oldAllowance + value);
}
/**
* @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
* value, non-reverting calls are assumed to be successful.
*
* IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
* smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
* this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
* that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
*/
function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
unchecked {
uint256 currentAllowance = token.allowance(address(this), spender);
if (currentAllowance < requestedDecrease) {
revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
}
forceApprove(token, spender, currentAllowance - requestedDecrease);
}
}
/**
* @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
* non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
* to be set to zero before setting it to a non-zero value, such as USDT.
*
* NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
* only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
* set here.
*/
function forceApprove(IERC20 token, address spender, uint256 value) internal {
if (!_safeApprove(token, spender, value, false)) {
if (!_safeApprove(token, spender, 0, true)) revert SafeERC20FailedOperation(address(token));
if (!_safeApprove(token, spender, value, true)) revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that relies on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
safeTransfer(token, to, value);
} else if (!token.transferAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
* has no code. This can be used to implement an {ERC721}-like safe transfer that relies on {ERC1363} checks when
* targeting contracts.
*
* Reverts if the returned value is other than `true`.
*/
function transferFromAndCallRelaxed(
IERC1363 token,
address from,
address to,
uint256 value,
bytes memory data
) internal {
if (to.code.length == 0) {
safeTransferFrom(token, from, to, value);
} else if (!token.transferFromAndCall(from, to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
* code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
* targeting contracts.
*
* NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
* Oppositely, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
* once without retrying, and relies on the returned value to be true.
*
* Reverts if the returned value is other than `true`.
*/
function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
if (to.code.length == 0) {
forceApprove(token, to, value);
} else if (!token.approveAndCall(to, value, data)) {
revert SafeERC20FailedOperation(address(token));
}
}
/**
* @dev Imitates a Solidity `token.transfer(to, value)` call, 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 to The recipient of the tokens
* @param value The amount of token to transfer
* @param bubble Behavior switch if the transfer call reverts: bubble the revert reason or return a false boolean.
*/
function _safeTransfer(IERC20 token, address to, uint256 value, bool bubble) private returns (bool success) {
bytes4 selector = IERC20.transfer.selector;
assembly ("memory-safe") {
let fmp := mload(0x40)
mstore(0x00, selector)
mstore(0x04, and(to, shr(96, not(0))))
mstore(0x24, value)
success := call(gas(), token, 0, 0x00, 0x44, 0x00, 0x20)
// if call success and return is true, all is good.
// otherwise (not success or return is not true), we need to perform further checks
if iszero(and(success, eq(mload(0x00), 1))) {
// if the call was a failure and bubble is enabled, bubble the error
if and(iszero(success), bubble) {
returndatacopy(fmp, 0x00, returndatasize())
revert(fmp, returndatasize())
}
// if the return value is not true, then the call is only successful if:
// - the token address has code
// - the returndata is empty
success := and(success, and(iszero(returndatasize()), gt(extcodesize(token), 0)))
}
mstore(0x40, fmp)
}
}
/**
* @dev Imitates a Solidity `token.transferFrom(from, to, value)` call, 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 from The sender of the tokens
* @param to The recipient of the tokens
* @param value The amount of token to transfer
* @param bubble Behavior switch if the transfer call reverts: bubble the revert reason or return a false boolean.
*/
function _safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value,
bool bubble
) private returns (bool success) {
bytes4 selector = IERC20.transferFrom.selector;
assembly ("memory-safe") {
let fmp := mload(0x40)
mstore(0x00, selector)
mstore(0x04, and(from, shr(96, not(0))))
mstore(0x24, and(to, shr(96, not(0))))
mstore(0x44, value)
success := call(gas(), token, 0, 0x00, 0x64, 0x00, 0x20)
// if call success and return is true, all is good.
// otherwise (not success or return is not true), we need to perform further checks
if iszero(and(success, eq(mload(0x00), 1))) {
// if the call was a failure and bubble is enabled, bubble the error
if and(iszero(success), bubble) {
returndatacopy(fmp, 0x00, returndatasize())
revert(fmp, returndatasize())
}
// if the return value is not true, then the call is only successful if:
// - the token address has code
// - the returndata is empty
success := and(success, and(iszero(returndatasize()), gt(extcodesize(token), 0)))
}
mstore(0x40, fmp)
mstore(0x60, 0)
}
}
/**
* @dev Imitates a Solidity `token.approve(spender, value)` call, 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 spender The spender of the tokens
* @param value The amount of token to transfer
* @param bubble Behavior switch if the transfer call reverts: bubble the revert reason or return a false boolean.
*/
function _safeApprove(IERC20 token, address spender, uint256 value, bool bubble) private returns (bool success) {
bytes4 selector = IERC20.approve.selector;
assembly ("memory-safe") {
let fmp := mload(0x40)
mstore(0x00, selector)
mstore(0x04, and(spender, shr(96, not(0))))
mstore(0x24, value)
success := call(gas(), token, 0, 0x00, 0x44, 0x00, 0x20)
// if call success and return is true, all is good.
// otherwise (not success or return is not true), we need to perform further checks
if iszero(and(success, eq(mload(0x00), 1))) {
// if the call was a failure and bubble is enabled, bubble the error
if and(iszero(success), bubble) {
returndatacopy(fmp, 0x00, returndatasize())
revert(fmp, returndatasize())
}
// if the return value is not true, then the call is only successful if:
// - the token address has code
// - the returndata is empty
success := and(success, and(iszero(returndatasize()), gt(extcodesize(token), 0)))
}
mstore(0x40, fmp)
}
}
}