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Latest 25 from a total of 1,287 transactions
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Latest 1 internal transaction
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1981356 | 1105 days ago | Contract Creation | 0 ETH |
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Minimal Proxy Contract for 0xbca527108bcc3de437c5bfdb1a5489de26deeae0
Contract Name:
AelinDeal
Compiler Version
v0.8.6+commit.11564f7e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import "./AelinERC20.sol"; import {IERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; contract AelinDeal is AelinERC20 { using SafeERC20 for IERC20; uint256 public maxTotalSupply; address public underlyingDealToken; uint256 public underlyingDealTokenTotal; uint256 public totalUnderlyingClaimed; address public holder; address public futureHolder; uint256 public underlyingPerDealExchangeRate; address public aelinPool; uint256 public vestingCliff; uint256 public vestingPeriod; uint256 public vestingExpiry; uint256 public holderFundingExpiry; uint256 public proRataRedemptionPeriod; uint256 public proRataRedemptionStart; uint256 public proRataRedemptionExpiry; uint256 public openRedemptionPeriod; uint256 public openRedemptionStart; uint256 public openRedemptionExpiry; bool public calledInitialize; bool public depositComplete; mapping(address => uint256) public amountVested; /** * @dev the constructor will always be blank due to the MinimalProxyFactory pattern * this allows the underlying logic of this contract to only be deployed once * and each new deal created is simply a storage wrapper */ constructor() {} /** * @dev the initialize method replaces the constructor setup and can only be called once * NOTE the deal tokens wrapping the underlying are always 18 decimals */ function initialize( string memory _name, string memory _symbol, address _underlyingDealToken, uint256 _underlyingDealTokenTotal, uint256 _vestingPeriod, uint256 _vestingCliff, uint256 _proRataRedemptionPeriod, uint256 _openRedemptionPeriod, address _holder, uint256 _maxDealTotalSupply, uint256 _holderFundingDuration ) external initOnce { _setNameSymbolAndDecimals( string(abi.encodePacked("aeDeal-", _name)), string(abi.encodePacked("aeD-", _symbol)), DEAL_TOKEN_DECIMALS ); holder = _holder; underlyingDealToken = _underlyingDealToken; underlyingDealTokenTotal = _underlyingDealTokenTotal; maxTotalSupply = _maxDealTotalSupply; aelinPool = msg.sender; vestingCliff = block.timestamp + _proRataRedemptionPeriod + _openRedemptionPeriod + _vestingCliff; vestingPeriod = _vestingPeriod; vestingExpiry = vestingCliff + _vestingPeriod; proRataRedemptionPeriod = _proRataRedemptionPeriod; openRedemptionPeriod = _openRedemptionPeriod; holderFundingExpiry = _holderFundingDuration; depositComplete = false; /** * calculates the amount of underlying deal tokens you get per wrapped deal token accepted */ underlyingPerDealExchangeRate = (_underlyingDealTokenTotal * 1e18) / maxTotalSupply; emit SetHolder(_holder); } modifier initOnce() { require(!calledInitialize, "can only initialize once"); calledInitialize = true; _; } modifier finalizeDeposit() { require(block.timestamp < holderFundingExpiry, "deposit past deadline"); require(!depositComplete, "deposit already complete"); _; } /** * @dev the holder may change their address */ function setHolder(address _holder) external onlyHolder { futureHolder = _holder; } function acceptHolder() external { require(msg.sender == futureHolder, "only future holder can access"); holder = futureHolder; emit SetHolder(futureHolder); } /** * @dev the holder finalizes the deal for the pool created by the * sponsor by depositing funds using this method. * * NOTE if the deposit was completed with a transfer instead of this method * the deposit still needs to be finalized by calling this method with * _underlyingDealTokenAmount set to 0 */ function depositUnderlying(uint256 _underlyingDealTokenAmount) external finalizeDeposit lock returns (bool) { if (_underlyingDealTokenAmount > 0) { uint256 currentBalance = IERC20(underlyingDealToken).balanceOf( address(this) ); IERC20(underlyingDealToken).safeTransferFrom( msg.sender, address(this), _underlyingDealTokenAmount ); uint256 balanceAfterTransfer = IERC20(underlyingDealToken) .balanceOf(address(this)); uint256 underlyingDealTokenAmount = balanceAfterTransfer - currentBalance; emit DepositDealToken( underlyingDealToken, msg.sender, underlyingDealTokenAmount ); } if ( IERC20(underlyingDealToken).balanceOf(address(this)) >= underlyingDealTokenTotal ) { depositComplete = true; proRataRedemptionStart = block.timestamp; proRataRedemptionExpiry = block.timestamp + proRataRedemptionPeriod; if (openRedemptionPeriod > 0) { openRedemptionStart = proRataRedemptionExpiry; openRedemptionExpiry = proRataRedemptionExpiry + openRedemptionPeriod; } emit DealFullyFunded( aelinPool, proRataRedemptionStart, proRataRedemptionExpiry, openRedemptionStart, openRedemptionExpiry ); return true; } return false; } /** * @dev the holder can withdraw any amount accidentally deposited over * the amount needed to fulfill the deal * * NOTE if the deposit was completed with a transfer instead of this method * the deposit still needs to be finalized by calling this method with * _underlyingDealTokenAmount set to 0 */ function withdraw() external onlyHolder { uint256 withdrawAmount; if (!depositComplete && block.timestamp >= holderFundingExpiry) { withdrawAmount = IERC20(underlyingDealToken).balanceOf( address(this) ); } else { withdrawAmount = IERC20(underlyingDealToken).balanceOf(address(this)) - (underlyingDealTokenTotal - totalUnderlyingClaimed); } IERC20(underlyingDealToken).safeTransfer(holder, withdrawAmount); emit WithdrawUnderlyingDealToken( underlyingDealToken, holder, withdrawAmount ); } /** * @dev after the redemption period has ended the holder can withdraw * the excess funds remaining from purchasers who did not accept the deal * * Requirements: * - both the pro rata and open redemption windows are no longer active */ function withdrawExpiry() external onlyHolder { require(proRataRedemptionExpiry > 0, "redemption period not started"); require( openRedemptionExpiry > 0 ? block.timestamp >= openRedemptionExpiry : block.timestamp >= proRataRedemptionExpiry, "redeem window still active" ); uint256 withdrawAmount = IERC20(underlyingDealToken).balanceOf( address(this) ) - ((underlyingPerDealExchangeRate * totalSupply()) / 1e18); IERC20(underlyingDealToken).safeTransfer(holder, withdrawAmount); emit WithdrawUnderlyingDealToken( underlyingDealToken, holder, withdrawAmount ); } modifier onlyHolder() { require(msg.sender == holder, "only holder can access"); _; } modifier onlyPool() { require(msg.sender == aelinPool, "only AelinPool can access"); _; } /** * @dev a view showing the number of claimable deal tokens and the * amount of the underlying deal token a purchser gets in return */ function claimableTokens(address purchaser) public view returns (uint256 underlyingClaimable, uint256 dealTokensClaimable) { underlyingClaimable = 0; dealTokensClaimable = 0; uint256 maxTime = block.timestamp > vestingExpiry ? vestingExpiry : block.timestamp; if ( balanceOf(purchaser) > 0 && (maxTime > vestingCliff || (maxTime == vestingCliff && vestingPeriod == 0)) ) { uint256 timeElapsed = maxTime - vestingCliff; dealTokensClaimable = vestingPeriod == 0 ? balanceOf(purchaser) : ((balanceOf(purchaser) + amountVested[purchaser]) * timeElapsed) / vestingPeriod - amountVested[purchaser]; underlyingClaimable = (underlyingPerDealExchangeRate * dealTokensClaimable) / 1e18; } } /** * @dev allows a user to claim their underlying deal tokens or a partial amount * of their underlying tokens once they have vested according to the schedule * created by the sponsor */ function claim() external returns (uint256) { return _claim(msg.sender); } function _claim(address recipient) internal returns (uint256) { ( uint256 underlyingDealTokensClaimed, uint256 dealTokensClaimed ) = claimableTokens(recipient); if (dealTokensClaimed > 0) { amountVested[recipient] += dealTokensClaimed; _burn(recipient, dealTokensClaimed); IERC20(underlyingDealToken).safeTransfer( recipient, underlyingDealTokensClaimed ); totalUnderlyingClaimed += underlyingDealTokensClaimed; emit ClaimedUnderlyingDealToken( underlyingDealToken, recipient, underlyingDealTokensClaimed ); } return dealTokensClaimed; } /** * @dev allows the purchaser to mint deal tokens. this method is also used * to send deal tokens to the sponsor and the aelin rewards pool. It may only * be called from the pool contract that created this deal */ function mint(address dst, uint256 dealTokenAmount) external onlyPool { require(depositComplete, "deposit not complete"); _mint(dst, dealTokenAmount); } /** * @dev deal tokens cant be transferred after the vesting expiry since * all tokens will be claimed at the start of the transfer leaving 0 to send */ modifier transferWindow() { require( vestingExpiry > block.timestamp, "no transfers after vest done" ); _; } /** * @dev below are helpers for transferring deal tokens. NOTE the token holder transferring * the deal tokens must pay the gas to claim their vested tokens first, which will burn their vested deal * tokens. They must also pay for the receivers claim and burn any of their vested tokens in order to ensure * the claim calculation is always accurate for all parties in the system */ function transferMax(address recipient) external returns (bool) { (, uint256 claimableDealTokens) = claimableTokens(msg.sender); return transfer(recipient, balanceOf(msg.sender) - claimableDealTokens); } function transferFromMax(address sender, address recipient) external returns (bool) { (, uint256 claimableDealTokens) = claimableTokens(sender); return transferFrom( sender, recipient, balanceOf(sender) - claimableDealTokens ); } function transfer(address recipient, uint256 amount) public virtual override transferWindow returns (bool) { _claim(msg.sender); _claim(recipient); return super.transfer(recipient, amount); } function transferFrom( address sender, address recipient, uint256 amount ) public virtual override transferWindow returns (bool) { _claim(sender); _claim(recipient); return super.transferFrom(sender, recipient, amount); } event SetHolder(address indexed holder); event DealFullyFunded( address indexed poolAddress, uint256 proRataRedemptionStart, uint256 proRataRedemptionExpiry, uint256 openRedemptionStart, uint256 openRedemptionExpiry ); event DepositDealToken( address indexed underlyingDealTokenAddress, address indexed depositor, uint256 underlyingDealTokenAmount ); event WithdrawUnderlyingDealToken( address indexed underlyingDealTokenAddress, address indexed depositor, uint256 underlyingDealTokenAmount ); event ClaimedUnderlyingDealToken( address indexed underlyingDealTokenAddress, address indexed recipient, uint256 underlyingDealTokensClaimed ); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import {ERC20, IERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; interface IERC20Decimals { function decimals() external view returns (uint8); } /** * @dev a standard ERC20 contract that is extended with a few methods * described in detail below */ contract AelinERC20 is ERC20 { bool setInfo; /** * @dev Due to the constructor being empty for the MinimalProxy architecture we need * to set the name and symbol in the initializer which requires these custom variables */ string private _custom_name; string private _custom_symbol; uint8 private _custom_decimals; bool private locked; uint8 constant DEAL_TOKEN_DECIMALS = 18; constructor() ERC20("", "") {} modifier initInfoOnce() { require(!setInfo, "can only initialize once"); _; } /** * @dev Due to the constructor being empty for the MinimalProxy architecture we need * to set the name, symbol, and decimals in the initializer which requires this * custom logic for name(), symbol(), decimals(), and _setNameSymbolAndDecimals() */ function name() public view virtual override returns (string memory) { return _custom_name; } function symbol() public view virtual override returns (string memory) { return _custom_symbol; } function decimals() public view virtual override returns (uint8) { return _custom_decimals; } function _setNameSymbolAndDecimals( string memory _name, string memory _symbol, uint8 _decimals ) internal initInfoOnce returns (bool) { _custom_name = _name; _custom_symbol = _symbol; _custom_decimals = _decimals; setInfo = true; emit AelinToken(_name, _symbol, _decimals); return true; } /** * @dev Add this to prevent reentrancy attacks on purchasePoolTokens and depositUnderlying * source: https://quantstamp.com/blog/how-the-dforce-hacker-used-reentrancy-to-steal-25-million * uniswap implementation: https://github.com/Uniswap/v2-core/blob/master/contracts/UniswapV2Pair.sol#L31-L36 */ modifier lock() { require(!locked, "AelinV1: LOCKED"); locked = true; _; locked = false; } event AelinToken(string name, string symbol, uint8 decimals); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @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 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' 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) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _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 require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ 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); }
// SPDX-License-Identifier: MIT pragma solidity ^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 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) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^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; 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"); (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"); (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"); (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"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal 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 assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.