Overview
ETH Balance
0.00000983519961607 ETH
ETH Value
$0.04 (@ $4,085.66/ETH)Token Holdings
More Info
Private Name Tags
ContractCreator
Latest 25 from a total of 657 transactions
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Unregister Bridg... | 117973610 | 254 days ago | IN | 0 ETH | 0.000000785206 | ||||
Unregister Bridg... | 117973603 | 254 days ago | IN | 0 ETH | 0.00000077156 | ||||
Unregister Bridg... | 117973596 | 254 days ago | IN | 0 ETH | 0.000000774827 | ||||
Unregister Bridg... | 117973589 | 254 days ago | IN | 0 ETH | 0.00000077714 | ||||
Unregister Bridg... | 117973581 | 254 days ago | IN | 0 ETH | 0.000000782023 | ||||
Withdraw Fee In ... | 117902397 | 255 days ago | IN | 0 ETH | 0.000001961405 | ||||
Withdraw Gas | 117902379 | 255 days ago | IN | 0 ETH | 0.00000098975 | ||||
Receive Tokens | 117893877 | 256 days ago | IN | 0 ETH | 0.000005260918 | ||||
Bridge | 117893477 | 256 days ago | IN | 0.000061847168354 ETH | 0.000004602765 | ||||
Receive Tokens | 117893470 | 256 days ago | IN | 0 ETH | 0.000005199439 | ||||
Bridge | 117893392 | 256 days ago | IN | 0.000061847168354 ETH | 0.000004447764 | ||||
Bridge | 117891555 | 256 days ago | IN | 0.00215137931197 ETH | 0.000004648727 | ||||
Bridge | 117884093 | 256 days ago | IN | 0.000552536126506 ETH | 0.000001836172 | ||||
Receive Tokens | 117795084 | 258 days ago | IN | 0 ETH | 0.000002106812 | ||||
Receive Tokens | 117773787 | 258 days ago | IN | 0 ETH | 0.000001261369 | ||||
Bridge | 117731201 | 259 days ago | IN | 0.000087509061727 ETH | 0.000001101392 | ||||
Receive Tokens | 117719052 | 260 days ago | IN | 0 ETH | 0.000001433094 | ||||
Bridge | 117697069 | 260 days ago | IN | 0.000783083448494 ETH | 0.000002259777 | ||||
Bridge | 117672289 | 261 days ago | IN | 0 ETH | 0.000001471152 | ||||
Receive Tokens | 117668459 | 261 days ago | IN | 0.000040000117232 ETH | 0.000001631237 | ||||
Bridge | 117662723 | 261 days ago | IN | 0 ETH | 0.000001135195 | ||||
Bridge | 117649444 | 261 days ago | IN | 0.001453172446322 ETH | 0.000001335214 | ||||
Bridge | 117634483 | 262 days ago | IN | 0.001076880974877 ETH | 0.000002966043 | ||||
Receive Tokens | 117615644 | 262 days ago | IN | 0 ETH | 0.000001234189 | ||||
Bridge | 117594919 | 263 days ago | IN | 0.000684992127589 ETH | 0.000001118703 |
Latest 19 internal transactions
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117902379 | 255 days ago | 0.22896 ETH | ||||
117668459 | 261 days ago | 0.000040000117232 ETH | ||||
117419807 | 267 days ago | 0.000039999999999 ETH | ||||
117281768 | 270 days ago | 0.000039999769292 ETH | ||||
117124316 | 273 days ago | 0.00004 ETH | ||||
116564544 | 286 days ago | 0.00004 ETH | ||||
116016544 | 299 days ago | 0.000079753893999 ETH | ||||
115990685 | 300 days ago | 0.000039999866777 ETH | ||||
115986071 | 300 days ago | 0.00004 ETH | ||||
115930966 | 301 days ago | 0.00004 ETH | ||||
115732338 | 306 days ago | 0.00004 ETH | ||||
115709221 | 306 days ago | 0.00004 ETH | ||||
115525539 | 310 days ago | 0.00004 ETH | ||||
115499797 | 311 days ago | 0.00004 ETH | ||||
115280362 | 316 days ago | 0.00004 ETH | ||||
115216434 | 318 days ago | 0.00004 ETH | ||||
114901356 | 325 days ago | 0.000040000132184 ETH | ||||
114791142 | 327 days ago | 0.00004 ETH | ||||
113774696 | 351 days ago | 0.00004 ETH |
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Contract Name:
CctpBridge
Compiler Version
v0.8.18+commit.87f61d96
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {IERC20Metadata} from "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; import {IGasOracle} from "./interfaces/IGasOracle.sol"; import {ITokenMessenger} from "./interfaces/cctp/ITokenMessenger.sol"; import {IMessageTransmitter} from "./interfaces/cctp/IMessageTransmitter.sol"; import {GasUsage} from "./GasUsage.sol"; contract CctpBridge is GasUsage { using SafeERC20 for IERC20Metadata; uint internal constant ORACLE_PRECISION = 18; uint internal constant BP = 1e4; uint public immutable chainId; // Admin fee share (in basis points) uint public adminFeeShareBP; IERC20Metadata private immutable token; ITokenMessenger private immutable cctpMessenger; IMessageTransmitter private immutable cctpTransmitter; // precomputed value of the scaling factor required for converting the stable token to gas amount uint private immutable stableTokensForGasScalingFactor; // precomputed value to divide by to change the precision from the Gas Oracle precision to the stable token precision uint private immutable fromGasOracleScalingFactor; mapping(uint chainId => uint domainNumber) private chainIdDomainMap; /** * @notice Emitted when the contract receives some gas directly. */ event ReceivedGas(address sender, uint amount); /** * @notice Emitted when the contract sends some extra gas to the recipient of tokens. */ event ReceivedExtraGas(address recipient, uint amount); /** * @notice Emitted when tokens are sent on the source blockchain. */ event TokensSent( uint amount, address sender, bytes32 recipient, uint destinationChainId, uint nonce, uint receivedRelayerFeeFromGas, uint receivedRelayerFeeFromTokens, uint relayerFee, uint receivedRelayerFeeTokenAmount, uint adminFeeTokenAmount ); constructor( uint chainId_, uint chainPrecision_, address tokenAddress, address cctpMessenger_, address cctpTransmitter_, IGasOracle gasOracle_ ) GasUsage(gasOracle_) { chainId = chainId_; token = IERC20Metadata(tokenAddress); uint tokenDecimals = token.decimals(); cctpMessenger = ITokenMessenger(cctpMessenger_); cctpTransmitter = IMessageTransmitter(cctpTransmitter_); token.approve(cctpMessenger_, type(uint256).max); stableTokensForGasScalingFactor = 10 ** (ORACLE_PRECISION - tokenDecimals + chainPrecision_); fromGasOracleScalingFactor = 10 ** (ORACLE_PRECISION - tokenDecimals); } /** * @notice Initiates a bridging process of the token to another blockchain. * @dev This function is used to initiate a cross-chain transfer. * The bridging fee required for the cross-chain transfer can be paid in two ways: * - by sending the required amount of native gas token along with the transaction * (See `getTransactionCost` in the `GasUsage` contract). * - by setting the parameter `relayerFeeTokenAmount` with the amount of bridging fee in tokens * (See the function `getBridgingCostInTokens`). * @param amount The amount of tokens to send (including `relayerFeeTokenAmount`). * @param recipient The recipient address. * @param destinationChainId The ID of the destination chain. * @param relayerFeeTokenAmount The amount of tokens to be deducted from the transferred amount as a bridging fee. */ function bridge( uint amount, bytes32 recipient, uint destinationChainId, uint relayerFeeTokenAmount ) external payable { require(amount > relayerFeeTokenAmount, "CCTP: Amount <= relayer fee"); require(recipient != 0, "CCTP: Recipient must be nonzero"); token.safeTransferFrom(msg.sender, address(this), amount); uint gasFromStables = _getStableTokensValueInGas(relayerFeeTokenAmount); uint relayerFee = this.getTransactionCost(destinationChainId); require(msg.value + gasFromStables >= relayerFee, "CCTP: Not enough fee"); uint amountToSend = amount - relayerFeeTokenAmount; uint adminFee; if (adminFeeShareBP != 0) { adminFee = (amountToSend * adminFeeShareBP) / BP; if (adminFee == 0) { adminFee = 1; } amountToSend -= adminFee; } uint32 destinationDomain = getDomainByChainId(destinationChainId); uint64 nonce = cctpMessenger.depositForBurn(amountToSend, destinationDomain, recipient, address(token)); emit TokensSent( amountToSend, msg.sender, recipient, destinationChainId, nonce, msg.value, gasFromStables, relayerFee, relayerFeeTokenAmount, adminFee ); } /** * @notice Completes the bridging process by sending the tokens on the destination blockchain to the recipient. * @param recipient The recipient address. * @param message The message information emitted by the CCTP contract `MessageTransmitter` on the source chain. * @param signature Concatenated 65-byte signature(s) of `message`. */ function receiveTokens(address recipient, bytes calldata message, bytes calldata signature) external payable { require(cctpTransmitter.receiveMessage(message, signature), "CCTP: Receive message failed"); // pass extra gas to the recipient if (msg.value > 0) { (bool sent, ) = payable(recipient).call{value: msg.value}(""); if (sent) { emit ReceivedExtraGas(recipient, msg.value); } } } /** * @notice Allows the admin to add new supported chain destination. * @param chainId_ The chain ID of the destination to register. * @param domain The domain of the destination to register. */ function registerBridgeDestination(uint chainId_, uint32 domain) external onlyOwner { chainIdDomainMap[chainId_] = domain + 1; } /** * @notice Allows the admin to remove a chain from the map of supported destinations. * @param chainId_ The chain ID of the destination to unregister. */ function unregisterBridgeDestination(uint chainId_) external onlyOwner { chainIdDomainMap[chainId_] = 0; } /** * @notice Allows the admin to withdraw the relayer fee collected in gas tokens. */ function withdrawGas(uint amount) external onlyOwner { payable(msg.sender).transfer(amount); } /** * @notice Allows the admin to withdraw the admin fee and relayer fee collected in tokens. */ function withdrawFeeInTokens() external onlyOwner { uint toWithdraw = token.balanceOf(address(this)); if (toWithdraw > 0) { token.safeTransfer(msg.sender, toWithdraw); } } /** * @notice Sets the basis points of the admin fee share from each bridge. */ function setAdminFeeShare(uint adminFeeShareBP_) external onlyOwner { require(adminFeeShareBP_ <= BP, "CCTP: Too high"); adminFeeShareBP = adminFeeShareBP_; } /** * @notice Calculates the amount of bridging fee nominated in the stable token. * @param destinationChainId The ID of the destination chain. * @return The total price of bridging, with the precision according to the token's `decimals()` value. */ function getBridgingCostInTokens(uint destinationChainId) external view returns (uint) { return gasOracle.getTransactionGasCostInUSD(destinationChainId, gasUsage[destinationChainId]) / fromGasOracleScalingFactor; } function isMessageProcessed(uint sourceChainId, uint64 nonce) external view returns (bool) { return cctpTransmitter.usedNonces(_hashSourceAndNonce(getDomainByChainId(sourceChainId), nonce)) != 0; } function getDomainByChainId(uint chainId_) public view returns (uint32) { uint domainNumber = chainIdDomainMap[chainId_]; require(domainNumber > 0, "CCTP: Unknown chain id"); return uint32(domainNumber - 1); } /** * @notice Calculates the amount of gas equivalent in value to provided amount of tokens * according to the current exchange rate. * @param stableTokenAmount The amount of tokens. * @return amount of gas tokens. */ function _getStableTokensValueInGas(uint stableTokenAmount) internal view returns (uint) { if (stableTokenAmount == 0) return 0; return (stableTokensForGasScalingFactor * stableTokenAmount) / gasOracle.price(chainId); } function _hashSourceAndNonce(uint32 sourceDomain, uint64 nonce) internal pure returns (bytes32) { return keccak256(abi.encodePacked(sourceDomain, nonce)); } fallback() external payable { revert("Unsupported"); } receive() external payable { emit ReceivedGas(msg.sender, msg.value); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol) pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @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() { _transferOwnership(_msgSender()); } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { _checkOwner(); _; } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if the sender is not the owner. */ function _checkOwner() internal view virtual { 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 { _transferOwnership(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"); _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Internal function without access restriction. */ function _transferOwnership(address newOwner) internal virtual { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol) 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.openzeppelin.com/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: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, 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}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, 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}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, 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) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, 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) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * 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: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by // decrementing then incrementing. _balances[to] += amount; } emit Transfer(from, to, amount); _afterTokenTransfer(from, to, 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; unchecked { // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above. _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; // Overflow not possible: amount <= accountBalance <= totalSupply. _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 Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - 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 // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) 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 // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ 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 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 `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../extensions/draft-IERC20Permit.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)); } } function safePermit( IERC20Permit token, address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { uint256 nonceBefore = token.nonces(owner); token.permit(owner, spender, value, deadline, v, r, s); uint256 nonceAfter = token.nonces(owner); require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed"); } /** * @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 // OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @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 * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 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 functionCallWithValue(target, data, 0, "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"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResultFromTarget(target, 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) { (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResultFromTarget(target, success, returndata, errorMessage); } /** * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract. * * _Available since v4.8._ */ function verifyCallResultFromTarget( address target, bool success, bytes memory returndata, string memory errorMessage ) internal view returns (bytes memory) { if (success) { if (returndata.length == 0) { // only check isContract if the call was successful and the return data is empty // otherwise we already know that it was a contract require(isContract(target), "Address: call to non-contract"); } return returndata; } else { _revert(returndata, errorMessage); } } /** * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason or 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 { _revert(returndata, errorMessage); } } function _revert(bytes memory returndata, string memory errorMessage) private pure { // 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 /// @solidity memory-safe-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Context.sol) 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 // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol) pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { enum Rounding { Down, // Toward negative infinity Up, // Toward infinity Zero // Toward zero } /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a > b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow. return (a & b) + (a ^ b) / 2; } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a == 0 ? 0 : (a - 1) / b + 1; } /** * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0 * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv) * with further edits by Uniswap Labs also under MIT license. */ function mulDiv( uint256 x, uint256 y, uint256 denominator ) internal pure returns (uint256 result) { unchecked { // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256 // variables such that product = prod1 * 2^256 + prod0. uint256 prod0; // Least significant 256 bits of the product uint256 prod1; // Most significant 256 bits of the product assembly { let mm := mulmod(x, y, not(0)) prod0 := mul(x, y) prod1 := sub(sub(mm, prod0), lt(mm, prod0)) } // Handle non-overflow cases, 256 by 256 division. if (prod1 == 0) { return prod0 / denominator; } // Make sure the result is less than 2^256. Also prevents denominator == 0. require(denominator > prod1); /////////////////////////////////////////////// // 512 by 256 division. /////////////////////////////////////////////// // Make division exact by subtracting the remainder from [prod1 prod0]. uint256 remainder; assembly { // Compute remainder using mulmod. remainder := mulmod(x, y, denominator) // Subtract 256 bit number from 512 bit number. prod1 := sub(prod1, gt(remainder, prod0)) prod0 := sub(prod0, remainder) } // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1. // See https://cs.stackexchange.com/q/138556/92363. // Does not overflow because the denominator cannot be zero at this stage in the function. uint256 twos = denominator & (~denominator + 1); assembly { // Divide denominator by twos. denominator := div(denominator, twos) // Divide [prod1 prod0] by twos. prod0 := div(prod0, twos) // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one. twos := add(div(sub(0, twos), twos), 1) } // Shift in bits from prod1 into prod0. prod0 |= prod1 * twos; // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for // four bits. That is, denominator * inv = 1 mod 2^4. uint256 inverse = (3 * denominator) ^ 2; // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works // in modular arithmetic, doubling the correct bits in each step. inverse *= 2 - denominator * inverse; // inverse mod 2^8 inverse *= 2 - denominator * inverse; // inverse mod 2^16 inverse *= 2 - denominator * inverse; // inverse mod 2^32 inverse *= 2 - denominator * inverse; // inverse mod 2^64 inverse *= 2 - denominator * inverse; // inverse mod 2^128 inverse *= 2 - denominator * inverse; // inverse mod 2^256 // Because the division is now exact we can divide by multiplying with the modular inverse of denominator. // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1 // is no longer required. result = prod0 * inverse; return result; } } /** * @notice Calculates x * y / denominator with full precision, following the selected rounding direction. */ function mulDiv( uint256 x, uint256 y, uint256 denominator, Rounding rounding ) internal pure returns (uint256) { uint256 result = mulDiv(x, y, denominator); if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) { result += 1; } return result; } /** * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down. * * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11). */ function sqrt(uint256 a) internal pure returns (uint256) { if (a == 0) { return 0; } // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target. // // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`. // // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)` // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))` // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)` // // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit. uint256 result = 1 << (log2(a) >> 1); // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128, // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision // into the expected uint128 result. unchecked { result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; result = (result + a / result) >> 1; return min(result, a / result); } } /** * @notice Calculates sqrt(a), following the selected rounding direction. */ function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = sqrt(a); return result + (rounding == Rounding.Up && result * result < a ? 1 : 0); } } /** * @dev Return the log in base 2, rounded down, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 128; } if (value >> 64 > 0) { value >>= 64; result += 64; } if (value >> 32 > 0) { value >>= 32; result += 32; } if (value >> 16 > 0) { value >>= 16; result += 16; } if (value >> 8 > 0) { value >>= 8; result += 8; } if (value >> 4 > 0) { value >>= 4; result += 4; } if (value >> 2 > 0) { value >>= 2; result += 2; } if (value >> 1 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 2, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log2(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log2(value); return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0); } } /** * @dev Return the log in base 10, rounded down, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >= 10**64) { value /= 10**64; result += 64; } if (value >= 10**32) { value /= 10**32; result += 32; } if (value >= 10**16) { value /= 10**16; result += 16; } if (value >= 10**8) { value /= 10**8; result += 8; } if (value >= 10**4) { value /= 10**4; result += 4; } if (value >= 10**2) { value /= 10**2; result += 2; } if (value >= 10**1) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log10(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log10(value); return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0); } } /** * @dev Return the log in base 256, rounded down, of a positive value. * Returns 0 if given 0. * * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string. */ function log256(uint256 value) internal pure returns (uint256) { uint256 result = 0; unchecked { if (value >> 128 > 0) { value >>= 128; result += 16; } if (value >> 64 > 0) { value >>= 64; result += 8; } if (value >> 32 > 0) { value >>= 32; result += 4; } if (value >> 16 > 0) { value >>= 16; result += 2; } if (value >> 8 > 0) { result += 1; } } return result; } /** * @dev Return the log in base 10, following the selected rounding direction, of a positive value. * Returns 0 if given 0. */ function log256(uint256 value, Rounding rounding) internal pure returns (uint256) { unchecked { uint256 result = log256(value); return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol) // This file was procedurally generated from scripts/generate/templates/SafeCast.js. pragma solidity ^0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such 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. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint248 from uint256, reverting on * overflow (when the input is greater than largest uint248). * * Counterpart to Solidity's `uint248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toUint248(uint256 value) internal pure returns (uint248) { require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits"); return uint248(value); } /** * @dev Returns the downcasted uint240 from uint256, reverting on * overflow (when the input is greater than largest uint240). * * Counterpart to Solidity's `uint240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toUint240(uint256 value) internal pure returns (uint240) { require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits"); return uint240(value); } /** * @dev Returns the downcasted uint232 from uint256, reverting on * overflow (when the input is greater than largest uint232). * * Counterpart to Solidity's `uint232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toUint232(uint256 value) internal pure returns (uint232) { require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits"); return uint232(value); } /** * @dev Returns the downcasted uint224 from uint256, reverting on * overflow (when the input is greater than largest uint224). * * Counterpart to Solidity's `uint224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.2._ */ function toUint224(uint256 value) internal pure returns (uint224) { require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits"); return uint224(value); } /** * @dev Returns the downcasted uint216 from uint256, reverting on * overflow (when the input is greater than largest uint216). * * Counterpart to Solidity's `uint216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toUint216(uint256 value) internal pure returns (uint216) { require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits"); return uint216(value); } /** * @dev Returns the downcasted uint208 from uint256, reverting on * overflow (when the input is greater than largest uint208). * * Counterpart to Solidity's `uint208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toUint208(uint256 value) internal pure returns (uint208) { require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits"); return uint208(value); } /** * @dev Returns the downcasted uint200 from uint256, reverting on * overflow (when the input is greater than largest uint200). * * Counterpart to Solidity's `uint200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toUint200(uint256 value) internal pure returns (uint200) { require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits"); return uint200(value); } /** * @dev Returns the downcasted uint192 from uint256, reverting on * overflow (when the input is greater than largest uint192). * * Counterpart to Solidity's `uint192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toUint192(uint256 value) internal pure returns (uint192) { require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits"); return uint192(value); } /** * @dev Returns the downcasted uint184 from uint256, reverting on * overflow (when the input is greater than largest uint184). * * Counterpart to Solidity's `uint184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toUint184(uint256 value) internal pure returns (uint184) { require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits"); return uint184(value); } /** * @dev Returns the downcasted uint176 from uint256, reverting on * overflow (when the input is greater than largest uint176). * * Counterpart to Solidity's `uint176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toUint176(uint256 value) internal pure returns (uint176) { require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits"); return uint176(value); } /** * @dev Returns the downcasted uint168 from uint256, reverting on * overflow (when the input is greater than largest uint168). * * Counterpart to Solidity's `uint168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toUint168(uint256 value) internal pure returns (uint168) { require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits"); return uint168(value); } /** * @dev Returns the downcasted uint160 from uint256, reverting on * overflow (when the input is greater than largest uint160). * * Counterpart to Solidity's `uint160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toUint160(uint256 value) internal pure returns (uint160) { require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits"); return uint160(value); } /** * @dev Returns the downcasted uint152 from uint256, reverting on * overflow (when the input is greater than largest uint152). * * Counterpart to Solidity's `uint152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toUint152(uint256 value) internal pure returns (uint152) { require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits"); return uint152(value); } /** * @dev Returns the downcasted uint144 from uint256, reverting on * overflow (when the input is greater than largest uint144). * * Counterpart to Solidity's `uint144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toUint144(uint256 value) internal pure returns (uint144) { require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits"); return uint144(value); } /** * @dev Returns the downcasted uint136 from uint256, reverting on * overflow (when the input is greater than largest uint136). * * Counterpart to Solidity's `uint136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toUint136(uint256 value) internal pure returns (uint136) { require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits"); return uint136(value); } /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v2.5._ */ function toUint128(uint256 value) internal pure returns (uint128) { require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint120 from uint256, reverting on * overflow (when the input is greater than largest uint120). * * Counterpart to Solidity's `uint120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toUint120(uint256 value) internal pure returns (uint120) { require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits"); return uint120(value); } /** * @dev Returns the downcasted uint112 from uint256, reverting on * overflow (when the input is greater than largest uint112). * * Counterpart to Solidity's `uint112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toUint112(uint256 value) internal pure returns (uint112) { require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits"); return uint112(value); } /** * @dev Returns the downcasted uint104 from uint256, reverting on * overflow (when the input is greater than largest uint104). * * Counterpart to Solidity's `uint104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toUint104(uint256 value) internal pure returns (uint104) { require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits"); return uint104(value); } /** * @dev Returns the downcasted uint96 from uint256, reverting on * overflow (when the input is greater than largest uint96). * * Counterpart to Solidity's `uint96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.2._ */ function toUint96(uint256 value) internal pure returns (uint96) { require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits"); return uint96(value); } /** * @dev Returns the downcasted uint88 from uint256, reverting on * overflow (when the input is greater than largest uint88). * * Counterpart to Solidity's `uint88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toUint88(uint256 value) internal pure returns (uint88) { require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits"); return uint88(value); } /** * @dev Returns the downcasted uint80 from uint256, reverting on * overflow (when the input is greater than largest uint80). * * Counterpart to Solidity's `uint80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toUint80(uint256 value) internal pure returns (uint80) { require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits"); return uint80(value); } /** * @dev Returns the downcasted uint72 from uint256, reverting on * overflow (when the input is greater than largest uint72). * * Counterpart to Solidity's `uint72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toUint72(uint256 value) internal pure returns (uint72) { require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits"); return uint72(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v2.5._ */ function toUint64(uint256 value) internal pure returns (uint64) { require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint56 from uint256, reverting on * overflow (when the input is greater than largest uint56). * * Counterpart to Solidity's `uint56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toUint56(uint256 value) internal pure returns (uint56) { require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits"); return uint56(value); } /** * @dev Returns the downcasted uint48 from uint256, reverting on * overflow (when the input is greater than largest uint48). * * Counterpart to Solidity's `uint48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toUint48(uint256 value) internal pure returns (uint48) { require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits"); return uint48(value); } /** * @dev Returns the downcasted uint40 from uint256, reverting on * overflow (when the input is greater than largest uint40). * * Counterpart to Solidity's `uint40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toUint40(uint256 value) internal pure returns (uint40) { require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits"); return uint40(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v2.5._ */ function toUint32(uint256 value) internal pure returns (uint32) { require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint24 from uint256, reverting on * overflow (when the input is greater than largest uint24). * * Counterpart to Solidity's `uint24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toUint24(uint256 value) internal pure returns (uint24) { require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits"); return uint24(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v2.5._ */ function toUint16(uint256 value) internal pure returns (uint16) { require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v2.5._ */ function toUint8(uint256 value) internal pure returns (uint8) { require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. * * _Available since v3.0._ */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int248 from int256, reverting on * overflow (when the input is less than smallest int248 or * greater than largest int248). * * Counterpart to Solidity's `int248` operator. * * Requirements: * * - input must fit into 248 bits * * _Available since v4.7._ */ function toInt248(int256 value) internal pure returns (int248 downcasted) { downcasted = int248(value); require(downcasted == value, "SafeCast: value doesn't fit in 248 bits"); } /** * @dev Returns the downcasted int240 from int256, reverting on * overflow (when the input is less than smallest int240 or * greater than largest int240). * * Counterpart to Solidity's `int240` operator. * * Requirements: * * - input must fit into 240 bits * * _Available since v4.7._ */ function toInt240(int256 value) internal pure returns (int240 downcasted) { downcasted = int240(value); require(downcasted == value, "SafeCast: value doesn't fit in 240 bits"); } /** * @dev Returns the downcasted int232 from int256, reverting on * overflow (when the input is less than smallest int232 or * greater than largest int232). * * Counterpart to Solidity's `int232` operator. * * Requirements: * * - input must fit into 232 bits * * _Available since v4.7._ */ function toInt232(int256 value) internal pure returns (int232 downcasted) { downcasted = int232(value); require(downcasted == value, "SafeCast: value doesn't fit in 232 bits"); } /** * @dev Returns the downcasted int224 from int256, reverting on * overflow (when the input is less than smallest int224 or * greater than largest int224). * * Counterpart to Solidity's `int224` operator. * * Requirements: * * - input must fit into 224 bits * * _Available since v4.7._ */ function toInt224(int256 value) internal pure returns (int224 downcasted) { downcasted = int224(value); require(downcasted == value, "SafeCast: value doesn't fit in 224 bits"); } /** * @dev Returns the downcasted int216 from int256, reverting on * overflow (when the input is less than smallest int216 or * greater than largest int216). * * Counterpart to Solidity's `int216` operator. * * Requirements: * * - input must fit into 216 bits * * _Available since v4.7._ */ function toInt216(int256 value) internal pure returns (int216 downcasted) { downcasted = int216(value); require(downcasted == value, "SafeCast: value doesn't fit in 216 bits"); } /** * @dev Returns the downcasted int208 from int256, reverting on * overflow (when the input is less than smallest int208 or * greater than largest int208). * * Counterpart to Solidity's `int208` operator. * * Requirements: * * - input must fit into 208 bits * * _Available since v4.7._ */ function toInt208(int256 value) internal pure returns (int208 downcasted) { downcasted = int208(value); require(downcasted == value, "SafeCast: value doesn't fit in 208 bits"); } /** * @dev Returns the downcasted int200 from int256, reverting on * overflow (when the input is less than smallest int200 or * greater than largest int200). * * Counterpart to Solidity's `int200` operator. * * Requirements: * * - input must fit into 200 bits * * _Available since v4.7._ */ function toInt200(int256 value) internal pure returns (int200 downcasted) { downcasted = int200(value); require(downcasted == value, "SafeCast: value doesn't fit in 200 bits"); } /** * @dev Returns the downcasted int192 from int256, reverting on * overflow (when the input is less than smallest int192 or * greater than largest int192). * * Counterpart to Solidity's `int192` operator. * * Requirements: * * - input must fit into 192 bits * * _Available since v4.7._ */ function toInt192(int256 value) internal pure returns (int192 downcasted) { downcasted = int192(value); require(downcasted == value, "SafeCast: value doesn't fit in 192 bits"); } /** * @dev Returns the downcasted int184 from int256, reverting on * overflow (when the input is less than smallest int184 or * greater than largest int184). * * Counterpart to Solidity's `int184` operator. * * Requirements: * * - input must fit into 184 bits * * _Available since v4.7._ */ function toInt184(int256 value) internal pure returns (int184 downcasted) { downcasted = int184(value); require(downcasted == value, "SafeCast: value doesn't fit in 184 bits"); } /** * @dev Returns the downcasted int176 from int256, reverting on * overflow (when the input is less than smallest int176 or * greater than largest int176). * * Counterpart to Solidity's `int176` operator. * * Requirements: * * - input must fit into 176 bits * * _Available since v4.7._ */ function toInt176(int256 value) internal pure returns (int176 downcasted) { downcasted = int176(value); require(downcasted == value, "SafeCast: value doesn't fit in 176 bits"); } /** * @dev Returns the downcasted int168 from int256, reverting on * overflow (when the input is less than smallest int168 or * greater than largest int168). * * Counterpart to Solidity's `int168` operator. * * Requirements: * * - input must fit into 168 bits * * _Available since v4.7._ */ function toInt168(int256 value) internal pure returns (int168 downcasted) { downcasted = int168(value); require(downcasted == value, "SafeCast: value doesn't fit in 168 bits"); } /** * @dev Returns the downcasted int160 from int256, reverting on * overflow (when the input is less than smallest int160 or * greater than largest int160). * * Counterpart to Solidity's `int160` operator. * * Requirements: * * - input must fit into 160 bits * * _Available since v4.7._ */ function toInt160(int256 value) internal pure returns (int160 downcasted) { downcasted = int160(value); require(downcasted == value, "SafeCast: value doesn't fit in 160 bits"); } /** * @dev Returns the downcasted int152 from int256, reverting on * overflow (when the input is less than smallest int152 or * greater than largest int152). * * Counterpart to Solidity's `int152` operator. * * Requirements: * * - input must fit into 152 bits * * _Available since v4.7._ */ function toInt152(int256 value) internal pure returns (int152 downcasted) { downcasted = int152(value); require(downcasted == value, "SafeCast: value doesn't fit in 152 bits"); } /** * @dev Returns the downcasted int144 from int256, reverting on * overflow (when the input is less than smallest int144 or * greater than largest int144). * * Counterpart to Solidity's `int144` operator. * * Requirements: * * - input must fit into 144 bits * * _Available since v4.7._ */ function toInt144(int256 value) internal pure returns (int144 downcasted) { downcasted = int144(value); require(downcasted == value, "SafeCast: value doesn't fit in 144 bits"); } /** * @dev Returns the downcasted int136 from int256, reverting on * overflow (when the input is less than smallest int136 or * greater than largest int136). * * Counterpart to Solidity's `int136` operator. * * Requirements: * * - input must fit into 136 bits * * _Available since v4.7._ */ function toInt136(int256 value) internal pure returns (int136 downcasted) { downcasted = int136(value); require(downcasted == value, "SafeCast: value doesn't fit in 136 bits"); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128 downcasted) { downcasted = int128(value); require(downcasted == value, "SafeCast: value doesn't fit in 128 bits"); } /** * @dev Returns the downcasted int120 from int256, reverting on * overflow (when the input is less than smallest int120 or * greater than largest int120). * * Counterpart to Solidity's `int120` operator. * * Requirements: * * - input must fit into 120 bits * * _Available since v4.7._ */ function toInt120(int256 value) internal pure returns (int120 downcasted) { downcasted = int120(value); require(downcasted == value, "SafeCast: value doesn't fit in 120 bits"); } /** * @dev Returns the downcasted int112 from int256, reverting on * overflow (when the input is less than smallest int112 or * greater than largest int112). * * Counterpart to Solidity's `int112` operator. * * Requirements: * * - input must fit into 112 bits * * _Available since v4.7._ */ function toInt112(int256 value) internal pure returns (int112 downcasted) { downcasted = int112(value); require(downcasted == value, "SafeCast: value doesn't fit in 112 bits"); } /** * @dev Returns the downcasted int104 from int256, reverting on * overflow (when the input is less than smallest int104 or * greater than largest int104). * * Counterpart to Solidity's `int104` operator. * * Requirements: * * - input must fit into 104 bits * * _Available since v4.7._ */ function toInt104(int256 value) internal pure returns (int104 downcasted) { downcasted = int104(value); require(downcasted == value, "SafeCast: value doesn't fit in 104 bits"); } /** * @dev Returns the downcasted int96 from int256, reverting on * overflow (when the input is less than smallest int96 or * greater than largest int96). * * Counterpart to Solidity's `int96` operator. * * Requirements: * * - input must fit into 96 bits * * _Available since v4.7._ */ function toInt96(int256 value) internal pure returns (int96 downcasted) { downcasted = int96(value); require(downcasted == value, "SafeCast: value doesn't fit in 96 bits"); } /** * @dev Returns the downcasted int88 from int256, reverting on * overflow (when the input is less than smallest int88 or * greater than largest int88). * * Counterpart to Solidity's `int88` operator. * * Requirements: * * - input must fit into 88 bits * * _Available since v4.7._ */ function toInt88(int256 value) internal pure returns (int88 downcasted) { downcasted = int88(value); require(downcasted == value, "SafeCast: value doesn't fit in 88 bits"); } /** * @dev Returns the downcasted int80 from int256, reverting on * overflow (when the input is less than smallest int80 or * greater than largest int80). * * Counterpart to Solidity's `int80` operator. * * Requirements: * * - input must fit into 80 bits * * _Available since v4.7._ */ function toInt80(int256 value) internal pure returns (int80 downcasted) { downcasted = int80(value); require(downcasted == value, "SafeCast: value doesn't fit in 80 bits"); } /** * @dev Returns the downcasted int72 from int256, reverting on * overflow (when the input is less than smallest int72 or * greater than largest int72). * * Counterpart to Solidity's `int72` operator. * * Requirements: * * - input must fit into 72 bits * * _Available since v4.7._ */ function toInt72(int256 value) internal pure returns (int72 downcasted) { downcasted = int72(value); require(downcasted == value, "SafeCast: value doesn't fit in 72 bits"); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64 downcasted) { downcasted = int64(value); require(downcasted == value, "SafeCast: value doesn't fit in 64 bits"); } /** * @dev Returns the downcasted int56 from int256, reverting on * overflow (when the input is less than smallest int56 or * greater than largest int56). * * Counterpart to Solidity's `int56` operator. * * Requirements: * * - input must fit into 56 bits * * _Available since v4.7._ */ function toInt56(int256 value) internal pure returns (int56 downcasted) { downcasted = int56(value); require(downcasted == value, "SafeCast: value doesn't fit in 56 bits"); } /** * @dev Returns the downcasted int48 from int256, reverting on * overflow (when the input is less than smallest int48 or * greater than largest int48). * * Counterpart to Solidity's `int48` operator. * * Requirements: * * - input must fit into 48 bits * * _Available since v4.7._ */ function toInt48(int256 value) internal pure returns (int48 downcasted) { downcasted = int48(value); require(downcasted == value, "SafeCast: value doesn't fit in 48 bits"); } /** * @dev Returns the downcasted int40 from int256, reverting on * overflow (when the input is less than smallest int40 or * greater than largest int40). * * Counterpart to Solidity's `int40` operator. * * Requirements: * * - input must fit into 40 bits * * _Available since v4.7._ */ function toInt40(int256 value) internal pure returns (int40 downcasted) { downcasted = int40(value); require(downcasted == value, "SafeCast: value doesn't fit in 40 bits"); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32 downcasted) { downcasted = int32(value); require(downcasted == value, "SafeCast: value doesn't fit in 32 bits"); } /** * @dev Returns the downcasted int24 from int256, reverting on * overflow (when the input is less than smallest int24 or * greater than largest int24). * * Counterpart to Solidity's `int24` operator. * * Requirements: * * - input must fit into 24 bits * * _Available since v4.7._ */ function toInt24(int256 value) internal pure returns (int24 downcasted) { downcasted = int24(value); require(downcasted == value, "SafeCast: value doesn't fit in 24 bits"); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16 downcasted) { downcasted = int16(value); require(downcasted == value, "SafeCast: value doesn't fit in 16 bits"); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8 downcasted) { downcasted = int8(value); require(downcasted == value, "SafeCast: value doesn't fit in 8 bits"); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. * * _Available since v3.0._ */ function toInt256(uint256 value) internal pure returns (int256) { // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; import {IGasOracle} from "./interfaces/IGasOracle.sol"; /** * @dev Contract module which allows children to store typical gas usage of a certain transaction on another chain. */ abstract contract GasUsage is Ownable { IGasOracle internal gasOracle; mapping(uint chainId => uint amount) public gasUsage; constructor(IGasOracle gasOracle_) { gasOracle = gasOracle_; } /** * @dev Sets the amount of gas used for a transaction on a given chain. * @param chainId The ID of the chain. * @param gasAmount The amount of gas used on the chain. */ function setGasUsage(uint chainId, uint gasAmount) external onlyOwner { gasUsage[chainId] = gasAmount; } /** * @dev Sets the Gas Oracle contract address. * @param gasOracle_ The address of the Gas Oracle contract. */ function setGasOracle(IGasOracle gasOracle_) external onlyOwner { gasOracle = gasOracle_; } /** * @notice Get the gas cost of a transaction on another chain in the current chain's native token. * @param chainId The ID of the chain for which to get the gas cost. * @return The calculated gas cost of the transaction in the current chain's native token */ function getTransactionCost(uint chainId) external view returns (uint) { unchecked { return gasOracle.getTransactionGasCostInNativeToken(chainId, gasUsage[chainId]); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {IReceiver} from "./IReceiver.sol"; interface IMessageTransmitter is IReceiver { function usedNonces(bytes32 _sourceAndNonce) external view returns (uint256); }
// SPDX-License-Identifier: Apache-2.0 /* * Copyright (c) 2022, Circle Internet Financial Limited. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity ^0.8.18; /** * @title IReceiver * @notice Receives messages on destination chain and forwards them to IMessageDestinationHandler */ interface IReceiver { /** * @notice Receives an incoming message, validating the header and passing * the body to application-specific handler. * @param message The message raw bytes * @param signature The message signature * @return success bool, true if successful */ function receiveMessage(bytes calldata message, bytes calldata signature) external returns (bool success); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; interface ITokenMessenger { /** * @notice Deposits and burns tokens from sender to be minted on destination domain. * Emits a `DepositForBurn` event. * @dev reverts if: * - given burnToken is not supported * - given destinationDomain has no TokenMessenger registered * - transferFrom() reverts. For example, if sender's burnToken balance or approved allowance * to this contract is less than `amount`. * - burn() reverts. For example, if `amount` is 0. * - MessageTransmitter returns false or reverts. * @param amount amount of tokens to burn * @param destinationDomain destination domain * @param mintRecipient address of mint recipient on destination domain * @param burnToken address of contract to burn deposited tokens, on local domain * @return _nonce unique nonce reserved by message */ function depositForBurn( uint amount, uint32 destinationDomain, bytes32 mintRecipient, address burnToken ) external returns (uint64 _nonce); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; enum MessengerProtocol { None, Allbridge, Wormhole, LayerZero } interface IBridge { function chainId() external view returns (uint); function processedMessages(bytes32) external view returns (uint); function sentMessages(bytes32) external view returns (uint); function otherBridges(uint) external view returns (bytes32); function otherBridgeTokens(uint, bytes32) external view returns (bool); function getBridgingCostInTokens( uint destinationChainId, MessengerProtocol messenger, address tokenAddress ) external view returns (uint); function hashMessage( uint amount, bytes32 recipient, uint sourceChainId, uint destinationChainId, bytes32 receiveToken, uint nonce, MessengerProtocol messenger ) external pure returns (bytes32); function receiveTokens( uint amount, bytes32 recipient, uint sourceChainId, bytes32 receiveToken, uint nonce, MessengerProtocol messenger, uint receiveAmountMin ) external payable; function withdrawGasTokens(uint amount) external; function registerBridge(uint chainId, bytes32 bridgeAddress) external; function addBridgeToken(uint chainId, bytes32 tokenAddress) external; function removeBridgeToken(uint chainId, bytes32 tokenAddress) external; function swapAndBridge( bytes32 token, uint amount, bytes32 recipient, uint destinationChainId, bytes32 receiveToken, uint nonce, MessengerProtocol messenger, uint feeTokenAmount ) external payable; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; interface IGasOracle { function chainData(uint chainId) external view returns (uint128 price, uint128 gasPrice); function chainId() external view returns (uint); function crossRate(uint otherChainId) external view returns (uint); function getTransactionGasCostInNativeToken(uint otherChainId, uint256 gasAmount) external view returns (uint); function getTransactionGasCostInUSD(uint otherChainId, uint256 gasAmount) external view returns (uint); function price(uint chainId) external view returns (uint); function setChainData(uint chainId, uint128 price, uint128 gasPrice) external; function setGasPrice(uint chainId, uint128 gasPrice) external; function setPrice(uint chainId, uint128 price) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {MessengerProtocol} from "./IBridge.sol"; interface IRouter { function canSwap() external view returns (uint8); function swap(uint amount, bytes32 token, bytes32 receiveToken, address recipient, uint receiveAmountMin) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {Math} from "@openzeppelin/contracts/utils/math/Math.sol"; import {SafeCast} from "@openzeppelin/contracts/utils/math/SafeCast.sol"; import {RewardManager} from "./RewardManager.sol"; /** * 4AD - D = 4A(x + y) - (D³ / 4xy) * X - is value of real stable token * Y - is value of virtual usd */ contract Pool is RewardManager { using SafeERC20 for ERC20; uint private constant SYSTEM_PRECISION = 3; int private constant PP = 1e4; // Price Precision uint private constant MAX_TOKEN_BALANCE = 2 ** 40; // Max possible token balance /** * @dev Gas optimization: both the 'feeShareBP' and 'router' fields are used during the 'swapFromVUsd', 'swapToVUsd' * operations and can occupy the same slot. */ uint16 public feeShareBP; address public router; uint public tokenBalance; uint public vUsdBalance; uint public balanceRatioMinBP; uint public reserves; uint public immutable a; uint public d; uint private immutable tokenAmountReduce; uint private immutable tokenAmountIncrease; // can restrict deposit or withdraw operations address private stopAuthority; // is deposit operation allowed uint public canDeposit = 1; // is withdraw operation allowed uint public canWithdraw = 1; event SwappedToVUsd(address sender, address token, uint amount, uint vUsdAmount, uint fee); event SwappedFromVUsd(address recipient, address token, uint vUsdAmount, uint amount, uint fee); constructor( address router_, uint a_, ERC20 token_, uint16 feeShareBP_, uint balanceRatioMinBP_, string memory lpName, string memory lpSymbol ) RewardManager(token_, lpName, lpSymbol) { a = a_; router = router_; stopAuthority = owner(); feeShareBP = feeShareBP_; balanceRatioMinBP = balanceRatioMinBP_; uint decimals = token_.decimals(); tokenAmountReduce = decimals > SYSTEM_PRECISION ? 10 ** (decimals - SYSTEM_PRECISION) : 0; tokenAmountIncrease = decimals < SYSTEM_PRECISION ? 10 ** (SYSTEM_PRECISION - decimals) : 0; } /** * @dev Throws if called by any account other than the router. */ modifier onlyRouter() { require(router == msg.sender, "Pool: is not router"); _; } /** * @dev Throws if called by any account other than the stopAuthority. */ modifier onlyStopAuthority() { require(stopAuthority == msg.sender, "Pool: is not stopAuthority"); _; } /** * @dev Modifier to prevent function from disbalancing the pool over a threshold defined by `balanceRatioMinBP` */ modifier validateBalanceRatio() { _; if (tokenBalance > vUsdBalance) { require((vUsdBalance * BP) / tokenBalance >= balanceRatioMinBP, "Pool: low vUSD balance"); } else if (tokenBalance < vUsdBalance) { require((tokenBalance * BP) / vUsdBalance >= balanceRatioMinBP, "Pool: low token balance"); } } /** * @dev Modifier to make a function callable only when the deposit is allowed. */ modifier whenCanDeposit() { require(canDeposit == 1, "Pool: deposit prohibited"); _; } /** * @dev Modifier to make a function callable only when the withdraw is allowed. */ modifier whenCanWithdraw() { require(canWithdraw == 1, "Pool: withdraw prohibited"); _; } /** * @dev Calculates the price and deposit token according to the amount and price, then adds the same amount to the X * and to the Y * @param amount The deposited amount */ function deposit(uint amount) external whenCanDeposit { uint oldD = d; uint amountSP = _toSystemPrecision(amount); require(amountSP > 0, "Pool: too little"); token.safeTransferFrom(msg.sender, address(this), amount); // Add deposited amount to reserves reserves += amountSP; uint oldBalance = (tokenBalance + vUsdBalance); if (oldD == 0 || oldBalance == 0) { // Split balance equally on the first deposit uint halfAmount = amountSP >> 1; tokenBalance += halfAmount; vUsdBalance += halfAmount; } else { // Add amount proportionally to each pool tokenBalance += (amountSP * tokenBalance) / oldBalance; vUsdBalance += (amountSP * vUsdBalance) / oldBalance; } _updateD(); // Deposit as many LP tokens as the D increase _depositLp(msg.sender, d - oldD); require(tokenBalance < MAX_TOKEN_BALANCE, "Pool: too much"); } /* * @dev Subtracts X and Y for that amount, calculates current price and withdraw the token to the user according to * the price * @param amount The deposited amount */ function withdraw(uint amountLp) external whenCanWithdraw { uint oldD = d; _withdrawLp(msg.sender, amountLp); // Always withdraw tokens in amount equal to amountLp // Withdraw proportionally from token and vUsd balance uint oldBalance = (tokenBalance + vUsdBalance); tokenBalance -= (amountLp * tokenBalance) / oldBalance; vUsdBalance -= (amountLp * vUsdBalance) / oldBalance; require(tokenBalance + vUsdBalance < oldBalance, "Pool: zero changes"); // Check if there is enough funds in reserve to withdraw require(amountLp <= reserves, "Pool: reserves"); // Adjust reserves by withdraw amount reserves -= amountLp; // Update D and transfer tokens to the sender _updateD(); require(d < oldD, "Pool: zero D changes"); token.safeTransfer(msg.sender, _fromSystemPrecision(amountLp)); } /** * @notice Calculates new virtual USD value from the given amount of tokens. * @dev Calculates new Y according to new X. * NOTICE: Prior to calling this the router must transfer tokens from the user to the pool. * @param amount The amount of tokens to swap. * @param zeroFee When true it allows to swap without incurring any fees. It is intended for use with service * accounts. * @return returns the difference between the old and the new value of vUsdBalance */ function swapToVUsd( address user, uint amount, bool zeroFee ) external onlyRouter validateBalanceRatio returns (uint) { uint result; // 0 by default uint fee; if (amount > 0) { if (!zeroFee) { fee = (amount * feeShareBP) / BP; } uint amountIn = _toSystemPrecision(amount - fee); // Incorporate rounding dust into the fee fee = amount - _fromSystemPrecision(amountIn); // Adjust token and reserve balances after the fee is applied tokenBalance += amountIn; reserves += amountIn; uint vUsdNewAmount = this.getY(tokenBalance); if (vUsdBalance > vUsdNewAmount) { result = vUsdBalance - vUsdNewAmount; } vUsdBalance = vUsdNewAmount; _addRewards(fee); } emit SwappedToVUsd(user, address(token), amount, result, fee); return result; } /** * @notice Calculates the amount of tokens from the given virtual USD value, and transfers it to the user. * @dev Calculates new X according to new Y. * @param user The address of the recipient. * @param amount The amount of vUSD to swap. * @param receiveAmountMin The minimum amount of tokens required to be received during the swap, otherwise the * transaction reverts. * @param zeroFee When true it allows to swap without incurring any fees. It is intended for use with service * accounts. * @return returns the difference between the old and the new value of vUsdBalance */ function swapFromVUsd( address user, uint amount, uint receiveAmountMin, bool zeroFee ) external onlyRouter validateBalanceRatio returns (uint) { uint resultSP; // 0 by default uint result; // 0 by default uint fee; if (amount > 0) { vUsdBalance += amount; uint newAmount = this.getY(vUsdBalance); if (tokenBalance > newAmount) { resultSP = tokenBalance - newAmount; result = _fromSystemPrecision(resultSP); } // Otherwise result/resultSP stay 0 // Check if there is enough funds in reserve to pay require(resultSP <= reserves, "Pool: reserves"); // Remove from reserves including fee, apply fee later reserves -= resultSP; if (!zeroFee) { fee = (result * feeShareBP) / BP; } // We can use unchecked here because feeShareBP <= BP unchecked { result -= fee; } tokenBalance = newAmount; require(result >= receiveAmountMin, "Pool: slippage"); token.safeTransfer(user, result); _addRewards(fee); } emit SwappedFromVUsd(user, address(token), amount, result, fee); return result; } /** * @dev Sets admin fee share. */ function setFeeShare(uint16 feeShareBP_) external onlyOwner { require(feeShareBP_ <= BP, "Pool: too large"); feeShareBP = feeShareBP_; } function adjustTotalLpAmount() external onlyOwner { if (d > totalSupply()) { _depositLp(owner(), d - totalSupply()); } } /** * @dev Sets the threshold over which the pool can't be disbalanced. */ function setBalanceRatioMinBP(uint balanceRatioMinBP_) external onlyOwner { require(balanceRatioMinBP_ <= BP, "Pool: too large"); balanceRatioMinBP = balanceRatioMinBP_; } /** * @dev Switches off the possibility to make deposits. */ function stopDeposit() external onlyStopAuthority { canDeposit = 0; } /** * @dev Switches on the possibility to make deposits. */ function startDeposit() external onlyOwner { canDeposit = 1; } /** * @dev Switches off the possibility to make withdrawals. */ function stopWithdraw() external onlyStopAuthority { canWithdraw = 0; } /** * @dev Switches on the possibility to make withdrawals. */ function startWithdraw() external onlyOwner { canWithdraw = 1; } /** * @dev Sets the address of the stopAuthority account. */ function setStopAuthority(address stopAuthority_) external onlyOwner { stopAuthority = stopAuthority_; } /** * @dev Sets the address of the Router contract. */ function setRouter(address router_) external onlyOwner { router = router_; } /** * @dev y = (sqrt(x(4AD³ + x (4A(D - x) - D )²)) + x (4A(D - x) - D ))/8Ax. */ function getY(uint x) external view returns (uint) { uint d_ = d; // Gas optimization uint a4 = a << 2; uint a8 = a4 << 1; // 4A(D - x) - D int part1 = int(a4) * (int(d_) - int(x)) - int(d_); // x * (4AD³ + x(part1²)) uint part2 = x * (a4 * d_ * d_ * d_ + x * uint(part1 * part1)); // (sqrt(part2) + x(part1)) / 8Ax) return SafeCast.toUint256(int(_sqrt(part2)) + int(x) * part1) / (a8 * x) + 1; // +1 to offset rounding errors } /** * @dev price = (1/2) * ((D³ + 8ADx² - 8Ax³ - 2Dx²) / (4x * sqrt(x(4AD³ + x (4A(D - x) - D )²)))) */ function getPrice() external view returns (uint) { uint x = tokenBalance; uint a8 = a << 3; uint dCubed = d * d * d; // 4A(D - x) - D int p1 = int(a << 2) * (int(d) - int(x)) - int(d); // x * 4AD³ + x(p1²) uint p2 = x * ((a << 2) * dCubed + x * uint(p1 * p1)); // D³ + 8ADx² - 8Ax³ - 2Dx² int p3 = int(dCubed) + int((a << 3) * d * x * x) - int(a8 * x * x * x) - int((d << 1) * x * x); // 1/2 * p3 / (4x * sqrt(p2)) return SafeCast.toUint256((PP >> 1) + ((PP * p3) / int((x << 2) * _sqrt(p2)))); } function _updateD() internal { uint x = tokenBalance; uint y = vUsdBalance; // a = 8 * Axy(x+y) // b = 4 * xy(4A - 1) / 3 // c = sqrt(a² + b³) // D = cbrt(a + c) + cbrt(a - c) uint xy = x * y; uint a_ = a; // Axy(x+y) uint p1 = a_ * xy * (x + y); // xy(4A - 1) / 3 uint p2 = (xy * ((a_ << 2) - 1)) / 3; // p1² + p2³ uint p3 = _sqrt((p1 * p1) + (p2 * p2 * p2)); unchecked { uint d_ = _cbrt(p1 + p3); if (p3 > p1) { d_ -= _cbrt(p3 - p1); } else { d_ += _cbrt(p1 - p3); } d = (d_ << 1); } } function _toSystemPrecision(uint amount) internal view returns (uint) { if (tokenAmountReduce > 0) { return amount / tokenAmountReduce; } else if (tokenAmountIncrease > 0) { return amount * tokenAmountIncrease; } return amount; } function _fromSystemPrecision(uint amount) internal view returns (uint) { if (tokenAmountReduce > 0) { return amount * tokenAmountReduce; } else if (tokenAmountIncrease > 0) { return amount / tokenAmountIncrease; } return amount; } function _sqrt(uint n) internal pure returns (uint) { unchecked { if (n > 0) { uint x = (n >> 1) + 1; uint y = (x + n / x) >> 1; while (x > y) { x = y; y = (x + n / x) >> 1; } return x; } return 0; } } function _cbrt(uint n) internal pure returns (uint) { unchecked { uint x = 0; for (uint y = 1 << 255; y > 0; y >>= 3) { x <<= 1; uint z = 3 * x * (x + 1) + 1; if (n / y >= z) { n -= y * z; x += 1; } } return x; } } fallback() external payable { revert("Unsupported"); } receive() external payable { revert("Unsupported"); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; contract RewardManager is Ownable, ERC20 { using SafeERC20 for ERC20; uint private constant P = 52; uint internal constant BP = 1e4; // Accumulated rewards per share, shifted left by P bits uint public accRewardPerShareP; // Reward token ERC20 public immutable token; // Info of each user reward debt mapping(address user => uint amount) public userRewardDebt; // Admin fee share (in basis points) uint public adminFeeShareBP; // Unclaimed admin fee amount uint public adminFeeAmount; event Deposit(address indexed user, uint amount); event Withdraw(address indexed user, uint amount); event RewardsClaimed(address indexed user, uint amount); constructor(ERC20 token_, string memory lpName, string memory lpSymbol) ERC20(lpName, lpSymbol) { token = token_; // Default admin fee is 20% adminFeeShareBP = BP / 5; } /** * @notice Claims pending rewards for the current staker without updating the stake balance. */ function claimRewards() external { uint userLpAmount = balanceOf(msg.sender); if (userLpAmount > 0) { uint rewards = (userLpAmount * accRewardPerShareP) >> P; uint pending = rewards - userRewardDebt[msg.sender]; if (pending > 0) { userRewardDebt[msg.sender] = rewards; token.safeTransfer(msg.sender, pending); emit RewardsClaimed(msg.sender, pending); } } } /** * @notice Sets the basis points of the admin fee share from rewards. */ function setAdminFeeShare(uint adminFeeShareBP_) external onlyOwner { require(adminFeeShareBP_ <= BP, "RewardManager: too high"); adminFeeShareBP = adminFeeShareBP_; } /** * @notice Allows the admin to claim the collected admin fee. */ function claimAdminFee() external onlyOwner { if (adminFeeAmount > 0) { token.safeTransfer(msg.sender, adminFeeAmount); adminFeeAmount = 0; } } /** * @notice Returns pending rewards for the staker. * @param user The address of the staker. */ function pendingReward(address user) external view returns (uint) { return ((balanceOf(user) * accRewardPerShareP) >> P) - userRewardDebt[user]; } /** * @dev Returns the number of decimals used to get user representation of LP tokens. */ function decimals() public pure override returns (uint8) { return 3; } /** * @dev Adds reward to the pool, splits admin fee share and updates the accumulated rewards per share. */ function _addRewards(uint rewardAmount) internal { if (totalSupply() > 0) { uint adminFeeRewards = (rewardAmount * adminFeeShareBP) / BP; unchecked { rewardAmount -= adminFeeRewards; } accRewardPerShareP += (rewardAmount << P) / totalSupply(); adminFeeAmount += adminFeeRewards; } } /** * @dev Deposits LP amount for the user, updates user reward debt and pays pending rewards. */ function _depositLp(address to, uint lpAmount) internal { uint pending; uint userLpAmount = balanceOf(to); // Gas optimization if (userLpAmount > 0) { pending = ((userLpAmount * accRewardPerShareP) >> P) - userRewardDebt[to]; } userLpAmount += lpAmount; _mint(to, lpAmount); userRewardDebt[to] = (userLpAmount * accRewardPerShareP) >> P; if (pending > 0) { token.safeTransfer(to, pending); emit RewardsClaimed(to, pending); } emit Deposit(to, lpAmount); } /** * @dev Withdraws LP amount for the user, updates user reward debt and pays out pending rewards. */ function _withdrawLp(address from, uint lpAmount) internal { uint userLpAmount = balanceOf(from); // Gas optimization require(userLpAmount >= lpAmount, "RewardManager: not enough amount"); uint pending; if (userLpAmount > 0) { pending = ((userLpAmount * accRewardPerShareP) >> P) - userRewardDebt[from]; } userLpAmount -= lpAmount; _burn(from, lpAmount); userRewardDebt[from] = (userLpAmount * accRewardPerShareP) >> P; if (pending > 0) { token.safeTransfer(from, pending); emit RewardsClaimed(from, pending); } emit Withdraw(from, lpAmount); } function _transfer(address, address, uint) internal pure override { revert("Unsupported"); } function _approve(address, address, uint) internal pure override { revert("Unsupported"); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {IRouter} from "./interfaces/IRouter.sol"; import {MessengerProtocol} from "./interfaces/IBridge.sol"; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; import {Pool} from "./Pool.sol"; abstract contract Router is Ownable, IRouter { using SafeERC20 for ERC20; uint private immutable chainPrecision; uint internal constant ORACLE_PRECISION = 18; mapping(bytes32 tokenId => Pool) public pools; // precomputed values to divide by to change the precision from the Gas Oracle precision to the token precision mapping(address tokenAddress => uint scalingFactor) internal fromGasOracleScalingFactor; // precomputed values of the scaling factor required for paying the bridging fee with stable tokens mapping(address tokenAddress => uint scalingFactor) internal bridgingFeeConversionScalingFactor; // can restrict swap operations address private stopAuthority; /** * @dev The rebalancer is an account responsible for balancing the liquidity pools. It ensures that the pool is * balanced by executing zero-fee swaps when the pool is imbalanced. * * Gas optimization: both the 'rebalancer' and 'canSwap' fields are used in the 'swap' and 'swapAndBridge' * functions and can occupy the same slot. */ address private rebalancer; uint8 public override canSwap = 1; /** * @dev Emitted during the on-chain swap of tokens. */ event Swapped( address sender, address recipient, bytes32 sendToken, bytes32 receiveToken, uint sendAmount, uint receiveAmount ); constructor(uint chainPrecision_) { chainPrecision = chainPrecision_; stopAuthority = owner(); } /** * @dev Modifier to make a function callable only when the swap is allowed. */ modifier whenCanSwap() { require(canSwap == 1, "Router: swap prohibited"); _; } /** * @dev Throws if called by any account other than the stopAuthority. */ modifier onlyStopAuthority() { require(stopAuthority == msg.sender, "Router: is not stopAuthority"); _; } /** * @notice Swaps a given pair of tokens on the same blockchain. * @param amount The amount of tokens to be swapped. * @param token The token to be swapped. * @param receiveToken The token to receive in exchange for the swapped token. * @param recipient The address to receive the tokens. * @param receiveAmountMin The minimum amount of tokens required to receive during the swap. */ function swap( uint amount, bytes32 token, bytes32 receiveToken, address recipient, uint receiveAmountMin ) external override whenCanSwap { uint vUsdAmount = _sendAndSwapToVUsd(token, msg.sender, amount); uint receivedAmount = _receiveAndSwapFromVUsd(receiveToken, recipient, vUsdAmount, receiveAmountMin); emit Swapped(msg.sender, recipient, token, receiveToken, amount, receivedAmount); } /** * @notice Allows the admin to add new supported liquidity pools. * @dev Adds the address of the `Pool` contract to the list of supported liquidity pools. * @param pool The address of the `Pool` contract. * @param token The address of the token in the liquidity pool. */ function addPool(Pool pool, bytes32 token) external onlyOwner { pools[token] = pool; address tokenAddress = address(uint160(uint(token))); uint tokenDecimals = ERC20(tokenAddress).decimals(); bridgingFeeConversionScalingFactor[tokenAddress] = 10 ** (ORACLE_PRECISION - tokenDecimals + chainPrecision); fromGasOracleScalingFactor[tokenAddress] = 10 ** (ORACLE_PRECISION - tokenDecimals); } /** * @dev Switches off the possibility to make swaps. */ function stopSwap() external onlyStopAuthority { canSwap = 0; } /** * @dev Switches on the possibility to make swaps. */ function startSwap() external onlyOwner { canSwap = 1; } /** * @dev Allows the admin to set the address of the stopAuthority. */ function setStopAuthority(address stopAuthority_) external onlyOwner { stopAuthority = stopAuthority_; } /** * @dev Allows the admin to set the address of the rebalancer. */ function setRebalancer(address rebalancer_) external onlyOwner { rebalancer = rebalancer_; } function _receiveAndSwapFromVUsd( bytes32 token, address recipient, uint vUsdAmount, uint receiveAmountMin ) internal returns (uint) { Pool tokenPool = pools[token]; require(address(tokenPool) != address(0), "Router: no receive pool"); return tokenPool.swapFromVUsd(recipient, vUsdAmount, receiveAmountMin, recipient == rebalancer); } function _sendAndSwapToVUsd(bytes32 token, address user, uint amount) internal virtual returns (uint) { Pool pool = pools[token]; require(address(pool) != address(0), "Router: no pool"); ERC20(address(uint160(uint(token)))).safeTransferFrom(user, address(pool), amount); return pool.swapToVUsd(user, amount, user == rebalancer); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.18; import {IBridge, MessengerProtocol} from "../interfaces/IBridge.sol"; import {Router} from "../Router.sol"; contract TestBridgeForSwap is IBridge, Router { uint public chainId; mapping(bytes32 messageHash => uint isProcessed) public override processedMessages; mapping(bytes32 messageHash => uint isSent) public override sentMessages; // Info about bridges on other chains mapping(uint chainId => bytes32 bridgeAddress) public override otherBridges; // Info about tokens on other chains mapping(uint chainId => mapping(bytes32 tokenAddress => bool isSupported)) public override otherBridgeTokens; event vUsdSent(uint amount); constructor() Router(18) {} function swapAndBridge( bytes32 token, uint amount, bytes32 recipient, uint destinationChainId, bytes32 receiveToken, uint nonce, MessengerProtocol messenger, uint feeTokenAmount ) external payable override {} function receiveTokens( uint amount, bytes32, uint, bytes32 receiveToken, uint, MessengerProtocol, uint receiveAmountMin ) external payable override {} function withdrawGasTokens(uint amount) external override onlyOwner {} function registerBridge(uint chainId_, bytes32 bridgeAddress_) external override onlyOwner {} function addBridgeToken(uint chainId_, bytes32 tokenAddress_) external override onlyOwner {} function removeBridgeToken(uint chainId_, bytes32 tokenAddress_) external override onlyOwner {} function getBridgingCostInTokens(uint, MessengerProtocol, address) external pure override returns (uint) { return 0; } function hashMessage( uint, bytes32, uint, uint, bytes32, uint, MessengerProtocol ) external pure override returns (bytes32) { return 0; } function _sendAndSwapToVUsd(bytes32 token, address user, uint amount) internal override returns (uint) { uint vUsdAmount = super._sendAndSwapToVUsd(token, user, amount); emit vUsdSent(vUsdAmount); return vUsdAmount; } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
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[{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"},{"internalType":"uint256","name":"chainPrecision_","type":"uint256"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"address","name":"cctpMessenger_","type":"address"},{"internalType":"address","name":"cctpTransmitter_","type":"address"},{"internalType":"contract IGasOracle","name":"gasOracle_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ReceivedExtraGas","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ReceivedGas","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"bytes32","name":"recipient","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"destinationChainId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"nonce","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"receivedRelayerFeeFromGas","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"receivedRelayerFeeFromTokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"relayerFee","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"receivedRelayerFeeTokenAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"adminFeeTokenAmount","type":"uint256"}],"name":"TokensSent","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"adminFeeShareBP","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32","name":"recipient","type":"bytes32"},{"internalType":"uint256","name":"destinationChainId","type":"uint256"},{"internalType":"uint256","name":"relayerFeeTokenAmount","type":"uint256"}],"name":"bridge","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"chainId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId","type":"uint256"}],"name":"gasUsage","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"destinationChainId","type":"uint256"}],"name":"getBridgingCostInTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"}],"name":"getDomainByChainId","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId","type":"uint256"}],"name":"getTransactionCost","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"sourceChainId","type":"uint256"},{"internalType":"uint64","name":"nonce","type":"uint64"}],"name":"isMessageProcessed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bytes","name":"message","type":"bytes"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"receiveTokens","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"},{"internalType":"uint32","name":"domain","type":"uint32"}],"name":"registerBridgeDestination","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"adminFeeShareBP_","type":"uint256"}],"name":"setAdminFeeShare","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IGasOracle","name":"gasOracle_","type":"address"}],"name":"setGasOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId","type":"uint256"},{"internalType":"uint256","name":"gasAmount","type":"uint256"}],"name":"setGasUsage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"}],"name":"unregisterBridgeDestination","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawFeeInTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"withdrawGas","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000000a00000000000000000000000000000000000000000000000000000000000000120000000000000000000000000b2c639c533813f4aa9d7837caf62653d097ff850000000000000000000000002b4069517957735be00cee0fadae88a26365528f0000000000000000000000004d41f22c5a0e5c74090899e5a8fb597a8842b3e80000000000000000000000004ad835ffa57e5e1e82514b2ba01d21fc15199d9a
-----Decoded View---------------
Arg [0] : chainId_ (uint256): 10
Arg [1] : chainPrecision_ (uint256): 18
Arg [2] : tokenAddress (address): 0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85
Arg [3] : cctpMessenger_ (address): 0x2B4069517957735bE00ceE0fadAE88a26365528f
Arg [4] : cctpTransmitter_ (address): 0x4D41f22c5a0e5c74090899E5a8Fb597a8842b3e8
Arg [5] : gasOracle_ (address): 0x4Ad835ffa57E5E1E82514b2ba01d21fc15199D9a
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [2] : 0000000000000000000000000b2c639c533813f4aa9d7837caf62653d097ff85
Arg [3] : 0000000000000000000000002b4069517957735be00cee0fadae88a26365528f
Arg [4] : 0000000000000000000000004d41f22c5a0e5c74090899e5a8fb597a8842b3e8
Arg [5] : 0000000000000000000000004ad835ffa57e5e1e82514b2ba01d21fc15199d9a
Deployed Bytecode Sourcemap
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Swarm Source
ipfs://a6e32dea10e0192cd871f46d80dba9c5980bfcad8a3050d764ce4da727fc3f7c
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
OP | Ether (ETH) | 100.00% | $4,083.3 | 0.00000984 | $0.04016 |
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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.