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Contract Name:
XYCrossChainRelay
Compiler Version
v0.8.2+commit.661d1103
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: BUSL-1.1 pragma solidity 0.8.2; import "AccessControl.sol"; import "Pausable.sol"; import "SafeERC20.sol"; import "ERC20.sol"; import "ECDSA.sol"; import { Address } from "Address.sol"; import { Supervisor } from "Supervisor.sol"; import { IERC20MintBurnable } from "IERC20MintBurnable.sol"; /// @title XYCrossChainRelay relays token across different chains. It also inherits from ERC-20, which /// serves as the redeemable tokens. Tokens are minted when liquidity is deposited and are burnt when /// liquidity is withdrawn contract XYCrossChainRelay is ERC20, AccessControl, Pausable { using ECDSA for bytes32; using SafeERC20 for IERC20MintBurnable; using SafeERC20 for IERC20; /* ========== CONSTANTS ========== */ address public constant ETHER_ADDRESS = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE; // Roles in this contract // Owner: the admin of `ROLE_MANAGER` bytes32 public constant ROLE_OWNER = keccak256("ROLE_OWNER"); // Manager: able to pause/unpause contract bytes32 public constant ROLE_MANAGER = keccak256("ROLE_MANAGER"); // Staff: able to relay cross chain requests bytes32 public constant ROLE_STAFF = keccak256("ROLE_STAFF"); /* ========== STATE VARIABLES ========== */ uint32 public immutable thisChainId; // If `token` is Primitive Token, which means the token is not mint/burnable by us. // We can only transfer `token`s. bool public immutable isPrimitive; // A contract that supervises each cross chain relay by providing signatures Supervisor public immutable supervisor; // Token to be bridged address public immutable token; // If this flag is true, token bridge will be able to mint redeemable token to receiver when there is no liquidity during completeCrossChainRequest. // Otherwise, tx will fail when there is no liqiuidity. bool public isAbleToMintIfNoLiquidity; // Treasury where cross chain fees are sent to address public treasury; address public pendingTreasury; // Max amount of `token` allowed in each cross chain request uint256 public maxCrossChainAmount; // Number of the cross chain requests uint256 public numCrossChainRequests; // Mapping of completed cross chain requests: source chain id => request id => request mapping (uint32 => mapping (uint256 => bool)) public completedCrossChainRequest; /* ========== CONSTRUCTOR ========== */ /// @param chainId The ID of this chain, passed in as param for easier configuration for testing /// @param _treasury The Treasury address /// @param _supervisor The Supervisor address /// @param owner The owner address /// @param manager The manager address /// @param staff The staff address /// @param _token The token address /// @param _isPrimitive Is `_token` primitive token (which we don't have mint/burn privilege) /// @param _maxCrossChainAmount Max cross chain amount /// @param _redeemableTokenName The name of the Redeemable Token /// @param _redeemableTokenSymbol The symbol of the Redeemable Token constructor( uint32 chainId, address _treasury, address _supervisor, address owner, address manager, address staff, address _token, bool _isPrimitive, uint256 _maxCrossChainAmount, string memory _redeemableTokenName, string memory _redeemableTokenSymbol ) ERC20(_redeemableTokenName, _redeemableTokenSymbol) { require(Address.isContract(_supervisor), "ERR_SUPERVISOR_NOT_CONTRACT"); supervisor = Supervisor(_supervisor); // Token can only be either native (ETHER_ADDRESS) or ERC-20 token if (_token != ETHER_ADDRESS) { require(Address.isContract(_token), "ERR_TOKEN_NOT_CONTRACT"); } else { // If it's native token, it must be primitive since we cannot mint/burn it require(_isPrimitive, "ERR_NATIVE_TOKEN_NOT_PRIMITIVE"); } // Token can only be either native (ETHER_ADDRESS) or ERC-20 token token = _token; thisChainId = chainId; isPrimitive = _isPrimitive; treasury = _treasury; maxCrossChainAmount = _maxCrossChainAmount; _setRoleAdmin(ROLE_OWNER, ROLE_OWNER); _setRoleAdmin(ROLE_MANAGER, ROLE_OWNER); _setRoleAdmin(ROLE_STAFF, ROLE_MANAGER); _setupRole(ROLE_OWNER, owner); _setupRole(ROLE_MANAGER, manager); _setupRole(ROLE_STAFF, staff); } /* ========== MODIFIERS ========== */ modifier onlyPrimitiveToken() { require(isPrimitive, "ERR_NOT_PRIMITIVE_TOKEN"); _; } /* ========== INTERNAL FUNCTIONS ========== */ /// @notice Transfer ERC-20 token from user and check balance change /// @param sender The address to transfer token from /// @param amount Amount of the token to be transferred function _safeTransferAssetFrom(address sender, uint256 amount) private { uint256 bal = IERC20(token).balanceOf(address(this)); IERC20(token).safeTransferFrom(sender, address(this), amount); bal = IERC20(token).balanceOf(address(this)) - bal; require(bal == amount, "ERR_AMOUNT_NOT_ENOUGH"); } /// @notice Unified transfer interface for native token and ERC20 token /// @param _token Address of the token. Can be either `ETH_ADDRESS` for native token or ERC-20 token address /// @param receiver The address to receive token /// @param amount Amount of the token to be transferred function _safeTransferTokenUnified(address _token, address receiver, uint256 amount) private { if (_token == ETHER_ADDRESS) { payable(receiver).transfer(amount); } else { IERC20(_token).safeTransfer(receiver, amount); } } /// @notice Unified get balance interface for native token and ERC20 token /// @param _token Address of the token. Can be either `ETH_ADDRESS` for native token or ERC-20 token address function _getTokenBalanceUnified(address _token) view private returns (uint256) { if (_token == ETHER_ADDRESS) { return address(this).balance; } else { return IERC20(_token).balanceOf(address(this)); } } /* ========== RESTRICTED FUNCTIONS (TREASURY) ========== */ function proposeNewTreasury(address newTreasury) external { require(msg.sender == treasury, "ERR_NOT_TREASURY"); pendingTreasury = newTreasury; emit NewTreasuryProposed(newTreasury); } function acceptNewTreasury() external { require(msg.sender == pendingTreasury, "ERR_NOT_PENDING_TREASURY"); pendingTreasury = address(0); treasury = msg.sender; emit NewTreasuryAccepted(msg.sender); } /* ========== RESTRICTED FUNCTIONS (OWNER) ========== */ /// @notice Rescue fund accidentally sent to this contract. Token can be rescued only if it's not `token` /// @param tokens List of token address to rescue function rescue(IERC20[] memory tokens) external onlyRole(ROLE_OWNER) { for (uint256 i; i < tokens.length; i++) { IERC20 _token = tokens[i]; require(token != address(_token), "ERR_CAN_NOT_RESCUE_BRIDGE_TOKEN"); uint256 _tokenBalance = _getTokenBalanceUnified(address(_token)); _safeTransferTokenUnified(address(_token), msg.sender, _tokenBalance); } } /* ========== RESTRICTED FUNCTIONS (MANAGER) ========== */ /// @notice Pause the contract (could be executed only by manager) function pause() external onlyRole(ROLE_MANAGER) { _pause(); } /// @notice Unpause the contract (could be executed only by manager) function unpause() external onlyRole(ROLE_MANAGER) { _unpause(); } /// @notice Set max cross chain amount (could be executed only by manager) /// @param newMaxCrossChainAmount New max cross chain amount function setMaxCrossChainAmount(uint256 newMaxCrossChainAmount) external onlyRole(ROLE_MANAGER) { maxCrossChainAmount = newMaxCrossChainAmount; } /// @notice Set isAbleToMintIfNoLiquidity flag /// @param _set Switch on or off isAbleToMintIfNoLiquidity function setIsAbleToMintIfNoLiquidity(bool _set) external onlyPrimitiveToken onlyRole(ROLE_MANAGER) { isAbleToMintIfNoLiquidity = _set; emit IsAbleToMintIfNoLiquiditySet(msg.sender, _set); } /* ========== RESTRICTED FUNCTIONS (STAFF) ========== */ /// @notice Complete a cross chain request /// @param requestId ID of the cross chain request on the source chain /// @param sourceChainId Chain Id of the source chain /// @param receiver Receiver of the `token` /// @param amount Amount of `token` /// @param fee Fee amount (denominated in `token`) /// @param signatures Signatures of validators function completeCrossChainRequest(uint256 requestId, uint32 sourceChainId, address receiver, uint256 amount, uint256 fee, bytes[] memory signatures) external whenNotPaused onlyRole(ROLE_STAFF) { require(!completedCrossChainRequest[sourceChainId][requestId], "ERR_CROSS_CHAIN_REQUEST_ALREADY_COMPLETE"); require(amount > fee, "ERR_FEE_GREATER_THAN_AMOUNT"); require(amount <= maxCrossChainAmount, "ERR_INVALID_CROSS_CHAIN_AMOUNT"); bytes32 sigId = keccak256(abi.encodePacked(supervisor.VALIDATE_XY_CROSS_CHAIN_IDENTIFIER(), address(this), sourceChainId, thisChainId, requestId, receiver, amount, fee)); bytes32 sigIdHash = sigId.toEthSignedMessageHash(); supervisor.checkSignatures(sigIdHash, signatures); uint256 amountSubFee = amount - fee; bool isRedeemableTokenMinted = false; if (isPrimitive) { if (checkBridgeLiquidityEnough(amount)) { _safeTransferTokenUnified(token, receiver, amountSubFee); _safeTransferTokenUnified(token, treasury, fee); } else { require(isAbleToMintIfNoLiquidity, "ERR_NO_MINT_WHEN_NO_LIQUIDITY"); isRedeemableTokenMinted = true; // Mint redeemable token to receiver _mint(receiver, amountSubFee); _mint(treasury, fee); } } else { IERC20MintBurnable(token).mint(receiver, amountSubFee); IERC20MintBurnable(token).mint(treasury, fee); } completedCrossChainRequest[sourceChainId][requestId] = true; emit CrossChainCompleted(requestId, sourceChainId, thisChainId, receiver, amount, fee, isRedeemableTokenMinted); } /* ========== VIEW FUNCTIONS ========== */ /// @notice check if token bridge liquidity is enough /// @param amount Amount of `token` function checkBridgeLiquidityEnough(uint256 amount) public view returns (bool) { uint256 balance = _getTokenBalanceUnified(token); return (amount <= balance); } /* ========== WRITE FUNCTIONS ========== */ /// @notice Request to bridge `token` cross chain /// @param destChainId Chain Id of the destination chain /// @param receiver Receiver of the `token` on destination chain /// @param amount Amount of `token` to send cross chain function requestCrossChain(uint32 destChainId, address receiver, uint256 amount) external payable whenNotPaused { require(amount > 0 && amount <= maxCrossChainAmount, "ERR_INVALID_CROSS_CHAIN_AMOUNT"); uint256 id = numCrossChainRequests++; // Transfer token from sender if (token == ETHER_ADDRESS) { require(msg.value == amount, "ERR_MSG_VALUE_AMOUNT_MISMATCHED"); } else { require(msg.value == 0, "ERR_EXPECTED_ZERO_MSG_VALUE"); _safeTransferAssetFrom(msg.sender, amount); if (!isPrimitive) { IERC20MintBurnable(token).burn(amount); } } emit CrossChainRequested(id, thisChainId, destChainId, msg.sender, receiver, amount); } function deposit(uint256 amount) payable external whenNotPaused onlyPrimitiveToken { require(amount > 0, "ERR_ZERO_AMOUNT"); // Transfer token from depositor if (token == ETHER_ADDRESS) { require(msg.value == amount, "ERR_MSG_VALUE_AMOUNT_MISMATCHED"); } else { require(msg.value == 0, "ERR_EXPECTED_ZERO_MSG_VALUE"); _safeTransferAssetFrom(msg.sender, amount); } // Mint 1:1 LP token to depositor _mint(msg.sender, amount); emit Deposited(msg.sender, amount); } function withdraw(uint256 amount) external whenNotPaused onlyPrimitiveToken { require(amount > 0, "ERR_ZERO_AMOUNT"); // Burn withdrawer LP token _burn(msg.sender, amount); // Transfer 1:1 token to withdrawer. _safeTransferTokenUnified(token, msg.sender, amount); emit Withdrawn(msg.sender, amount); } /* ========== EVENTS ========== */ event NewTreasuryProposed(address newTreasury); event NewTreasuryAccepted(address newTreasury); event CrossChainRequested(uint256 indexed requestId, uint32 sourceChainId, uint32 indexed destChainId, address indexed sender, address receiver, uint256 amount); event CrossChainCompleted(uint256 indexed requestId, uint32 indexed sourceChainId, uint32 destChainId, address indexed receiver, uint256 amount, uint256 fee, bool isRedeemableTokenMinted); event Deposited(address indexed sender, uint256 amount); event Withdrawn(address indexed sender, uint256 amount); event IsAbleToMintIfNoLiquiditySet(address sender, bool isSet); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "IAccessControl.sol"; import "Context.sol"; import "Strings.sol"; import "ERC165.sol"; /** * @dev Contract module that allows children to implement role-based access * control mechanisms. This is a lightweight version that doesn't allow enumerating role * members except through off-chain means by accessing the contract event logs. Some * applications may benefit from on-chain enumerability, for those cases see * {AccessControlEnumerable}. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, msg.sender)); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. * * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to * grant and revoke this role. Extra precautions should be taken to secure * accounts that have been granted it. */ abstract contract AccessControl is Context, IAccessControl, ERC165 { struct RoleData { mapping(address => bool) members; bytes32 adminRole; } mapping(bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Modifier that checks that an account has a specific role. Reverts * with a standardized message including the required role. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/ * * _Available since v4.1._ */ modifier onlyRole(bytes32 role) { _checkRole(role, _msgSender()); _; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId); } /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view override returns (bool) { return _roles[role].members[account]; } /** * @dev Revert with a standard message if `account` is missing `role`. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/ */ function _checkRole(bytes32 role, address account) internal view { if (!hasRole(role, account)) { revert( string( abi.encodePacked( "AccessControl: account ", Strings.toHexString(uint160(account), 20), " is missing role ", Strings.toHexString(uint256(role), 32) ) ) ); } } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view override returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) public virtual override { require(account == _msgSender(), "AccessControl: can only renounce roles for self"); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. * * Emits a {RoleAdminChanged} event. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { bytes32 previousAdminRole = getRoleAdmin(role); _roles[role].adminRole = adminRole; emit RoleAdminChanged(role, previousAdminRole, adminRole); } function _grantRole(bytes32 role, address account) private { if (!hasRole(role, account)) { _roles[role].members[account] = true; emit RoleGranted(role, account, _msgSender()); } } function _revokeRole(bytes32 role, address account) private { if (hasRole(role, account)) { _roles[role].members[account] = false; emit RoleRevoked(role, account, _msgSender()); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev External interface of AccessControl declared to support ERC165 detection. */ interface IAccessControl { /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {AccessControl-_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) external view returns (bool); /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {AccessControl-_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) external view returns (bytes32); /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) external; /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) external; /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "Context.sol"; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ abstract contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor() { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. * * Requirements: * * - The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. * * Requirements: * * - The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; } /** * @dev Triggers stopped state. * * Requirements: * * - The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. * * Requirements: * * - The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "IERC20.sol"; import "Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "IERC20.sol"; import "IERC20Metadata.sol"; import "Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); } return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity 0.8.2; import "ECDSA.sol"; /// @title Supervisor is the guardian of YPool. It requires multiple validators to valid /// the requests from users and workers and sign on them if valid. contract Supervisor { using ECDSA for bytes32; /* ========== STATE VARIABLES ========== */ bytes32 public constant SET_THRESHOLD_IDENTIFIER = 'SET_THRESHOLD'; bytes32 public constant SET_VALIDATOR_IDENTIFIER = 'SET_VALIDATOR'; bytes32 public constant VALIDATE_XY_CROSS_CHAIN_IDENTIFIER = 'VALIDATE_XY_XCHAIN_IDENTIFIER'; // the chain ID contract located at uint32 immutable public chainId; // number of validators uint256 public validatorsNum; // threshold to pass the signature validation uint256 public threshold; // current nonce for write functions uint256 public nonce; // check if the address is one of the validators mapping (address => bool) public validators; /// @dev Constuctor with chainId / validators / threshold /// @param _chainId The chain ID located with /// @param _validators Initial validator addresses /// @param _threshold Initial threshold to pass the request validation constructor(uint32 _chainId, address [] memory _validators, uint256 _threshold) { chainId = _chainId; for (uint256 i; i < _validators.length; i++) { validators[_validators[i]] = true; } validatorsNum = _validators.length; require(_threshold <= validatorsNum, "ERR_INVALID_THRESHOLD"); threshold = _threshold; } /* ========== VIEW FUNCTIONS ========== */ /// @notice Check if there are enough signed signatures to the signature hash /// @param sigIdHash The signature hash to be signed /// @param signatures Signed signatures by different validators function checkSignatures(bytes32 sigIdHash, bytes[] memory signatures) public view { require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES"); address prevAddress = address(0); for (uint i; i < threshold; i++) { address recovered = sigIdHash.recover(signatures[i]); require(validators[recovered], "ERR_NOT_VALIDATOR"); require(recovered > prevAddress, "ERR_WRONG_SIGNER_ORDER"); prevAddress = recovered; } } /* ========== WRITE FUNCTIONS ========== */ /// @notice Change `threshold` by providing a correct nonce and enough signatures from validators /// @param _threshold New `threshold` /// @param _nonce The nonce to be processed /// @param signatures Signed signatures by validators function setThreshold(uint256 _threshold, uint256 _nonce, bytes[] memory signatures) external { require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES"); require(_nonce == nonce, "ERR_INVALID_NONCE"); require(_threshold > 0, "ERR_INVALID_THRESHOLD"); require(_threshold <= validatorsNum, "ERR_INVALID_THRESHOLD"); bytes32 sigId = keccak256(abi.encodePacked(SET_THRESHOLD_IDENTIFIER, address(this), chainId, _threshold, _nonce)); bytes32 sigIdHash = sigId.toEthSignedMessageHash(); checkSignatures(sigIdHash, signatures); threshold = _threshold; nonce++; } /// @notice Set / remove the validator address to be part of signatures committee /// @param _validator The address to add or remove /// @param flag `true` to add, `false` to remove /// @param _nonce The nonce to be processed /// @param signatures Signed signatures by validators function setValidator(address _validator, bool flag, uint256 _nonce, bytes[] memory signatures) external { require(_validator != address(0), "ERR_INVALID_VALIDATOR"); require(signatures.length >= threshold, "ERR_NOT_ENOUGH_SIGNATURES"); require(_nonce == nonce, "ERR_INVALID_NONCE"); require(flag != validators[_validator], "ERR_OPERATION_TO_VALIDATOR"); bytes32 sigId = keccak256(abi.encodePacked(SET_VALIDATOR_IDENTIFIER, address(this), chainId, _validator, flag, _nonce)); bytes32 sigIdHash = sigId.toEthSignedMessageHash(); checkSignatures(sigIdHash, signatures); if (validators[_validator]) { validatorsNum--; validators[_validator] = false; if (validatorsNum < threshold) threshold--; } else { validatorsNum++; validators[_validator] = true; } nonce++; } }
// SPDX-License-Identifier: BUSL-1.1 pragma solidity 0.8.2; import "IERC20.sol"; interface IERC20MintBurnable is IERC20 { function mint(address account, uint256 amount) external; function burn(uint256 amount) external; }
{ "evmVersion": "istanbul", "optimizer": { "enabled": true, "runs": 200 }, "libraries": { "XYCrossChainRelay.sol": {} }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000000000000000000000000000000000000000019000000000000000000000000ec4f3db7307c741c4bb94ffe5c7c6786a456787000000000000000000000000006907b249faeebb6fa5b14d27d4704a0d03dd5900000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b0000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b000000000000000000000000cd982cad5051a6c19414736acd55e39b8c8dcc5c000000000000000000000000061e31e7768b39a4282822b65569f8d814dc15f60000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000084595161401484a000000000000000000000000000000000000000000000000000000000000000000016000000000000000000000000000000000000000000000000000000000000001a0000000000000000000000000000000000000000000000000000000000000001f52656465656d61626c6520446567656e20427261696e2045786368616e676500000000000000000000000000000000000000000000000000000000000000000e52656465656d61626c6520444258000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : chainId (uint32): 25
Arg [1] : _treasury (address): 0xEc4f3db7307c741C4bB94ffe5c7c6786A4567870
Arg [2] : _supervisor (address): 0x06907b249FaEEBB6fA5b14d27D4704a0D03Dd590
Arg [3] : owner (address): 0x0132613b3A1061816F4661Ad301612910E3Cce0B
Arg [4] : manager (address): 0x0132613b3A1061816F4661Ad301612910E3Cce0B
Arg [5] : staff (address): 0xCD982cAD5051A6C19414736acd55E39B8C8DCC5c
Arg [6] : _token (address): 0x061E31e7768b39a4282822b65569F8d814dC15f6
Arg [7] : _isPrimitive (bool): False
Arg [8] : _maxCrossChainAmount (uint256): 10000000000000000000000000
Arg [9] : _redeemableTokenName (string): Redeemable Degen Brain Exchange
Arg [10] : _redeemableTokenSymbol (string): Redeemable DBX
-----Encoded View---------------
15 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000019
Arg [1] : 000000000000000000000000ec4f3db7307c741c4bb94ffe5c7c6786a4567870
Arg [2] : 00000000000000000000000006907b249faeebb6fa5b14d27d4704a0d03dd590
Arg [3] : 0000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b
Arg [4] : 0000000000000000000000000132613b3a1061816f4661ad301612910e3cce0b
Arg [5] : 000000000000000000000000cd982cad5051a6c19414736acd55e39b8c8dcc5c
Arg [6] : 000000000000000000000000061e31e7768b39a4282822b65569f8d814dc15f6
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [8] : 000000000000000000000000000000000000000000084595161401484a000000
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000160
Arg [10] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [11] : 000000000000000000000000000000000000000000000000000000000000001f
Arg [12] : 52656465656d61626c6520446567656e20427261696e2045786368616e676500
Arg [13] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [14] : 52656465656d61626c6520444258000000000000000000000000000000000000
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.