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Minimal Proxy Contract for 0x9f723008eec3493a31b6faf7d9fdf3a82322223c
Contract Name:
UniversalVault
Compiler Version
v0.7.6+commit.7338295f
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; pragma abicoder v2; import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol"; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import {Initializable} from "@openzeppelin/contracts/proxy/Initializable.sol"; import {EnumerableSet} from "@openzeppelin/contracts/utils/EnumerableSet.sol"; import {Address} from "@openzeppelin/contracts/utils/Address.sol"; import {TransferHelper} from "@uniswap/lib/contracts/libraries/TransferHelper.sol"; import {ERC1271} from "./Access/ERC1271.sol"; import {EIP712} from "./Access/EIP712.sol"; import {OwnableERC721} from "./Access/OwnableERC721.sol"; import {IRageQuit} from "./Geyser.sol"; interface IUniversalVault { /* user events */ event Locked(address delegate, address token, uint256 amount); event Unlocked(address delegate, address token, uint256 amount); event RageQuit(address delegate, address token, bool notified, string reason); /* data types */ struct LockData { address delegate; address token; uint256 balance; } /* initialize function */ function initialize() external; /* user functions */ function lock( address token, uint256 amount, bytes calldata permission ) external; function unlock( address token, uint256 amount, bytes calldata permission ) external; function rageQuit(address delegate, address token) external returns (bool notified, string memory error); function transferERC20( address token, address to, uint256 amount ) external; function transferETH(address to, uint256 amount) external payable; /* pure functions */ function calculateLockID(address delegate, address token) external pure returns (bytes32 lockID); /* getter functions */ function getPermissionHash( bytes32 eip712TypeHash, address delegate, address token, uint256 amount, uint256 nonce ) external view returns (bytes32 permissionHash); function getNonce() external view returns (uint256 nonce); function owner() external view returns (address ownerAddress); function getLockSetCount() external view returns (uint256 count); function getLockAt(uint256 index) external view returns (LockData memory lockData); function getBalanceDelegated(address token, address delegate) external view returns (uint256 balance); function getBalanceLocked(address token) external view returns (uint256 balance); function checkBalances() external view returns (bool validity); } /// @title UniversalVault /// @notice Vault for isolated storage of staking tokens /// @dev Warning: not compatible with rebasing tokens /// @dev Security contact: [email protected] contract UniversalVault is IUniversalVault, EIP712("UniversalVault", "1.0.0"), ERC1271, OwnableERC721, Initializable { using SafeMath for uint256; using Address for address; using Address for address payable; using EnumerableSet for EnumerableSet.Bytes32Set; /* constant */ // Hardcoding a gas limit for rageQuit() is required to prevent gas DOS attacks // the gas requirement cannot be determined at runtime by querying the delegate // as it could potentially be manipulated by a malicious delegate who could force // the calls to revert. // The gas limit could alternatively be set upon vault initialization or creation // of a lock, but the gas consumption trade-offs are not favorable. // Ultimately, to avoid a need for fixed gas limits, the EVM would need to provide // an error code that allows for reliably catching out-of-gas errors on remote calls. uint256 public constant RAGEQUIT_GAS = 500000; bytes32 public constant LOCK_TYPEHASH = keccak256("Lock(address delegate,address token,uint256 amount,uint256 nonce)"); bytes32 public constant UNLOCK_TYPEHASH = keccak256("Unlock(address delegate,address token,uint256 amount,uint256 nonce)"); /* storage */ uint256 private _nonce; mapping(bytes32 => LockData) private _locks; EnumerableSet.Bytes32Set private _lockSet; /* initialization function */ function initializeLock() external initializer {} function initialize() external override initializer { OwnableERC721._setNFT(msg.sender); } /* ether receive */ receive() external payable {} /* internal overrides */ function _getOwner() internal view override(ERC1271) returns (address ownerAddress) { return OwnableERC721.owner(); } /* pure functions */ function calculateLockID(address delegate, address token) public pure override returns (bytes32 lockID) { return keccak256(abi.encodePacked(delegate, token)); } /* getter functions */ function getPermissionHash( bytes32 eip712TypeHash, address delegate, address token, uint256 amount, uint256 nonce ) public view override returns (bytes32 permissionHash) { return EIP712._hashTypedDataV4(keccak256(abi.encode(eip712TypeHash, delegate, token, amount, nonce))); } function getNonce() external view override returns (uint256 nonce) { return _nonce; } function owner() public view override(IUniversalVault, OwnableERC721) returns (address ownerAddress) { return OwnableERC721.owner(); } function getLockSetCount() external view override returns (uint256 count) { return _lockSet.length(); } function getLockAt(uint256 index) external view override returns (LockData memory lockData) { return _locks[_lockSet.at(index)]; } function getBalanceDelegated(address token, address delegate) external view override returns (uint256 balance) { return _locks[calculateLockID(delegate, token)].balance; } function getBalanceLocked(address token) public view override returns (uint256 balance) { uint256 count = _lockSet.length(); for (uint256 index; index < count; index++) { LockData storage _lockData = _locks[_lockSet.at(index)]; if (_lockData.token == token && _lockData.balance > balance) balance = _lockData.balance; } return balance; } function checkBalances() external view override returns (bool validity) { // iterate over all token locks and validate sufficient balance uint256 count = _lockSet.length(); for (uint256 index; index < count; index++) { // fetch storage lock reference LockData storage _lockData = _locks[_lockSet.at(index)]; // if insufficient balance and no∏t shutdown, return false if (IERC20(_lockData.token).balanceOf(address(this)) < _lockData.balance) return false; } // if sufficient balance or shutdown, return true return true; } /* user functions */ /// @notice Lock ERC20 tokens in the vault /// access control: called by delegate with signed permission from owner /// state machine: anytime /// state scope: /// - insert or update _locks /// - increase _nonce /// token transfer: none /// @param token Address of token being locked /// @param amount Amount of tokens being locked /// @param permission Permission signature payload function lock( address token, uint256 amount, bytes calldata permission ) external override onlyValidSignature(getPermissionHash(LOCK_TYPEHASH, msg.sender, token, amount, _nonce), permission) { // get lock id bytes32 lockID = calculateLockID(msg.sender, token); // add lock to storage if (_lockSet.contains(lockID)) { // if lock already exists, increase amount _locks[lockID].balance = _locks[lockID].balance.add(amount); } else { // if does not exist, create new lock // add lock to set assert(_lockSet.add(lockID)); // add lock data to storage _locks[lockID] = LockData(msg.sender, token, amount); } // validate sufficient balance require( IERC20(token).balanceOf(address(this)) >= _locks[lockID].balance, "UniversalVault: insufficient balance" ); // increase nonce _nonce += 1; // emit event emit Locked(msg.sender, token, amount); } /// @notice Unlock ERC20 tokens in the vault /// access control: called by delegate with signed permission from owner /// state machine: after valid lock from delegate /// state scope: /// - remove or update _locks /// - increase _nonce /// token transfer: none /// @param token Address of token being unlocked /// @param amount Amount of tokens being unlocked /// @param permission Permission signature payload function unlock( address token, uint256 amount, bytes calldata permission ) external override onlyValidSignature(getPermissionHash(UNLOCK_TYPEHASH, msg.sender, token, amount, _nonce), permission) { // get lock id bytes32 lockID = calculateLockID(msg.sender, token); // validate existing lock require(_lockSet.contains(lockID), "UniversalVault: missing lock"); // update lock data if (_locks[lockID].balance > amount) { // substract amount from lock balance _locks[lockID].balance = _locks[lockID].balance.sub(amount); } else { // delete lock data delete _locks[lockID]; assert(_lockSet.remove(lockID)); } // increase nonce _nonce += 1; // emit event emit Unlocked(msg.sender, token, amount); } /// @notice Forcibly cancel delegate lock /// @dev This function will attempt to notify the delegate of the rage quit using /// a fixed amount of gas. /// access control: only owner /// state machine: after valid lock from delegate /// state scope: /// - remove item from _locks /// token transfer: none /// @param delegate Address of delegate /// @param token Address of token being unlocked function rageQuit(address delegate, address token) external override onlyOwner returns (bool notified, string memory error) { // get lock id bytes32 lockID = calculateLockID(delegate, token); // validate existing lock require(_lockSet.contains(lockID), "UniversalVault: missing lock"); // attempt to notify delegate if (delegate.isContract()) { // check for sufficient gas require(gasleft() >= RAGEQUIT_GAS, "UniversalVault: insufficient gas"); // attempt rageQuit notification try IRageQuit(delegate).rageQuit{gas: RAGEQUIT_GAS}() { notified = true; } catch Error(string memory res) { notified = false; error = res; } catch (bytes memory) { notified = false; } } // update lock storage assert(_lockSet.remove(lockID)); delete _locks[lockID]; // emit event emit RageQuit(delegate, token, notified, error); } /// @notice Transfer ERC20 tokens out of vault /// access control: only owner /// state machine: when balance >= max(lock) + amount /// state scope: none /// token transfer: transfer any token /// @param token Address of token being transferred /// @param to Address of the recipient /// @param amount Amount of tokens to transfer function transferERC20( address token, address to, uint256 amount ) external override onlyOwner { // check for sufficient balance require( IERC20(token).balanceOf(address(this)) >= getBalanceLocked(token).add(amount), "UniversalVault: insufficient balance" ); // perform transfer TransferHelper.safeTransfer(token, to, amount); } /// @notice Transfer ERC20 tokens out of vault /// access control: only owner /// state machine: when balance >= amount /// state scope: none /// token transfer: transfer any token /// @param to Address of the recipient /// @param amount Amount of ETH to transfer function transferETH(address to, uint256 amount) external payable override onlyOwner { // perform transfer TransferHelper.safeTransferETH(to, amount); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @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 // solhint-disable-next-line compiler-version pragma solidity >=0.4.24 <0.8.0; import "../utils/Address.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function _isConstructor() private view returns (bool) { return !Address.isContract(address(this)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity >=0.6.0; // helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false library TransferHelper { function safeApprove( address token, address to, uint256 value ) internal { // bytes4(keccak256(bytes('approve(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::safeApprove: approve failed' ); } function safeTransfer( address token, address to, uint256 value ) internal { // bytes4(keccak256(bytes('transfer(address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::safeTransfer: transfer failed' ); } function safeTransferFrom( address token, address from, address to, uint256 value ) internal { // bytes4(keccak256(bytes('transferFrom(address,address,uint256)'))); (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value)); require( success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper::transferFrom: transferFrom failed' ); } function safeTransferETH(address to, uint256 value) internal { (bool success, ) = to.call{value: value}(new bytes(0)); require(success, 'TransferHelper::safeTransferETH: ETH transfer failed'); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {ECDSA} from "@openzeppelin/contracts/cryptography/ECDSA.sol"; import {Address} from "@openzeppelin/contracts/utils/Address.sol"; interface IERC1271 { function isValidSignature(bytes32 _messageHash, bytes memory _signature) external view returns (bytes4 magicValue); } library SignatureChecker { function isValidSignature( address signer, bytes32 hash, bytes memory signature ) internal view returns (bool) { if (Address.isContract(signer)) { bytes4 selector = IERC1271.isValidSignature.selector; (bool success, bytes memory returndata) = signer.staticcall(abi.encodeWithSelector(selector, hash, signature)); return success && abi.decode(returndata, (bytes4)) == selector; } else { return ECDSA.recover(hash, signature) == signer; } } } /// @title ERC1271 /// @notice Module for ERC1271 compatibility /// @dev Security contact: [email protected] abstract contract ERC1271 is IERC1271 { // Valid magic value bytes4(keccak256("isValidSignature(bytes32,bytes)") bytes4 internal constant VALID_SIG = IERC1271.isValidSignature.selector; // Invalid magic value bytes4 internal constant INVALID_SIG = bytes4(0); modifier onlyValidSignature(bytes32 permissionHash, bytes memory signature) { require(isValidSignature(permissionHash, signature) == VALID_SIG, "ERC1271: Invalid signature"); _; } function _getOwner() internal view virtual returns (address owner); function isValidSignature(bytes32 permissionHash, bytes memory signature) public view override returns (bytes4) { return SignatureChecker.isValidSignature(_getOwner(), permissionHash, signature) ? VALID_SIG : INVALID_SIG; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /* solhint-disable max-line-length */ /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private constant _TYPE_HASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"); /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { _HASHED_NAME = keccak256(bytes(name)); _HASHED_VERSION = keccak256(bytes(version)); } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { return _buildDomainSeparator(_TYPE_HASH, _EIP712NameHash(), _EIP712VersionHash()); } function _buildDomainSeparator( bytes32 typeHash, bytes32 name, bytes32 version ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, name, version, _getChainId(), address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", _domainSeparatorV4(), structHash)); } function _getChainId() private view returns (uint256 chainId) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 // solhint-disable-next-line no-inline-assembly assembly { chainId := chainid() } } /** * @dev The hash of the name parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712NameHash() internal view virtual returns (bytes32) { return _HASHED_NAME; } /** * @dev The hash of the version parameter for the EIP712 domain. * * NOTE: This function reads from storage by default, but can be redefined to return a constant value if gas costs * are a concern. */ function _EIP712VersionHash() internal view virtual returns (bytes32) { return _HASHED_VERSION; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol"; /// @title OwnableERC721 /// @notice Use ERC721 ownership for access control /// @dev Security contact: [email protected] contract OwnableERC721 { address private _nftAddress; modifier onlyOwner() { require(owner() == msg.sender, "OwnableERC721: caller is not the owner"); _; } function _setNFT(address nftAddress) internal { _nftAddress = nftAddress; } function nft() public view virtual returns (address nftAddress) { return _nftAddress; } function owner() public view virtual returns (address ownerAddress) { return IERC721(_nftAddress).ownerOf(uint256(address(this))); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; pragma abicoder v2; import {SafeMath} from "@openzeppelin/contracts/math/SafeMath.sol"; import {EnumerableSet} from "@openzeppelin/contracts/utils/EnumerableSet.sol"; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import {TransferHelper} from "@uniswap/lib/contracts/libraries/TransferHelper.sol"; import {IUniversalVault} from "./UniversalVault.sol"; import {IRewardPool} from "./RewardPool.sol"; import {IFactory} from "./Factory/IFactory.sol"; import {IInstanceRegistry} from "./Factory/InstanceRegistry.sol"; import {Powered} from "./PowerSwitch/Powered.sol"; interface IRageQuit { function rageQuit() external; } interface IGeyser is IRageQuit { /* admin events */ event GeyserCreated(address rewardPool, address powerSwitch); event GeyserFunded(uint256 amount, uint256 duration); event BonusTokenRegistered(address token); event VaultFactoryRegistered(address factory); event VaultFactoryRemoved(address factory); /* user events */ event Staked(address vault, uint256 amount); event Unstaked(address vault, uint256 amount); event RewardClaimed(address vault, address token, uint256 amount); /* data types */ struct GeyserData { address stakingToken; address rewardToken; address rewardPool; RewardScaling rewardScaling; uint256 rewardSharesOutstanding; uint256 totalStake; uint256 totalStakeUnits; uint256 lastUpdate; RewardSchedule[] rewardSchedules; } struct RewardSchedule { uint256 duration; uint256 start; uint256 shares; } struct VaultData { uint256 totalStake; StakeData[] stakes; } struct StakeData { uint256 amount; uint256 timestamp; } struct RewardScaling { uint256 floor; uint256 ceiling; uint256 time; } struct RewardOutput { uint256 lastStakeAmount; uint256 newStakesCount; uint256 reward; uint256 newTotalStakeUnits; } /* user functions */ function stake( address vault, uint256 amount, bytes calldata permission ) external; function unstakeAndClaim( address vault, uint256 amount, bytes calldata permission ) external; /* getter functions */ function getGeyserData() external view returns (GeyserData memory geyser); function getBonusTokenSetLength() external view returns (uint256 length); function getBonusTokenAtIndex(uint256 index) external view returns (address bonusToken); function getVaultFactorySetLength() external view returns (uint256 length); function getVaultFactoryAtIndex(uint256 index) external view returns (address factory); function getVaultData(address vault) external view returns (VaultData memory vaultData); function isValidAddress(address target) external view returns (bool validity); function isValidVault(address target) external view returns (bool validity); function getCurrentUnlockedRewards() external view returns (uint256 unlockedRewards); function getFutureUnlockedRewards(uint256 timestamp) external view returns (uint256 unlockedRewards); function getCurrentVaultReward(address vault) external view returns (uint256 reward); function getCurrentStakeReward(address vault, uint256 stakeAmount) external view returns (uint256 reward); function getFutureVaultReward(address vault, uint256 timestamp) external view returns (uint256 reward); function getFutureStakeReward( address vault, uint256 stakeAmount, uint256 timestamp ) external view returns (uint256 reward); function getCurrentVaultStakeUnits(address vault) external view returns (uint256 stakeUnits); function getFutureVaultStakeUnits(address vault, uint256 timestamp) external view returns (uint256 stakeUnits); function getCurrentTotalStakeUnits() external view returns (uint256 totalStakeUnits); function getFutureTotalStakeUnits(uint256 timestamp) external view returns (uint256 totalStakeUnits); /* pure functions */ function calculateTotalStakeUnits(StakeData[] memory stakes, uint256 timestamp) external pure returns (uint256 totalStakeUnits); function calculateStakeUnits( uint256 amount, uint256 start, uint256 end ) external pure returns (uint256 stakeUnits); function calculateUnlockedRewards( RewardSchedule[] memory rewardSchedules, uint256 rewardBalance, uint256 sharesOutstanding, uint256 timestamp ) external pure returns (uint256 unlockedRewards); function calculateRewardFromStakes( StakeData[] memory stakes, uint256 unstakeAmount, uint256 unlockedRewards, uint256 totalStakeUnits, uint256 timestamp, RewardScaling memory rewardScaling ) external pure returns (RewardOutput memory out); function calculateReward( uint256 unlockedRewards, uint256 stakeAmount, uint256 stakeDuration, uint256 totalStakeUnits, RewardScaling memory rewardScaling ) external pure returns (uint256 reward); } /// @title Geyser /// @notice Reward distribution contract with time multiplier /// @dev Security contact: [email protected] /// Access Control /// - Power controller: /// Can power off / shutdown the geyser /// Can withdraw rewards from reward pool once shutdown /// - Proxy owner: /// Can change arbitrary logic / state by upgrading the geyser /// Is unable to operate on user funds due to UniversalVault /// Is unable to operate on reward pool funds when reward pool is offline / shutdown /// - Geyser admin: /// Can add funds to the geyser, register bonus tokens, and whitelist new vault factories /// Is a subset of proxy owner permissions /// - User: /// Can deposit / withdraw / ragequit /// Geyser State Machine /// - Online: /// Geyser is operating normally, all functions are enabled /// - Offline: /// Geyser is temporarely disabled for maintenance /// User deposits and withdrawls are disabled, ragequit remains enabled /// Users can withdraw their stake through rageQuit() but forego their pending reward /// Should only be used when downtime required for an upgrade /// - Shutdown: /// Geyser is permanently disabled /// All functions are disabled with the exception of ragequit /// Users can withdraw their stake through rageQuit() /// Power controller can withdraw from the reward pool /// Should only be used if Proxy Owner role is compromized contract Geyser is IGeyser, Powered, OwnableUpgradeable { using SafeMath for uint256; using EnumerableSet for EnumerableSet.AddressSet; /* constants */ // An upper bound on the number of active stakes per vault is required to prevent // calls to rageQuit() from reverting. // With 30 stakes in a vault, ragequit costs 432811 gas which is conservatively lower // than the hardcoded limit of 500k gas on the vault. // This limit is configurable and could be increased in a future deployment. // Ultimately, to avoid a need for fixed upper bounds, the EVM would need to provide // an error code that allows for reliably catching out-of-gas errors on remote calls. uint256 public constant MAX_STAKES_PER_VAULT = 30; uint256 public constant MAX_REWARD_TOKENS = 50; uint256 public constant BASE_SHARES_PER_WEI = 1000000; /* storage */ GeyserData private _geyser; mapping(address => VaultData) private _vaults; EnumerableSet.AddressSet private _bonusTokenSet; EnumerableSet.AddressSet private _vaultFactorySet; /* initializer */ function initializeLock() external initializer {} /// @notice Initizalize geyser /// access control: only proxy constructor /// state machine: can only be called once /// state scope: set initialization variables /// token transfer: none /// @param ownerAddress address The admin address /// @param rewardPoolFactory address The factory to use for deploying the RewardPool /// @param powerSwitchFactory address The factory to use for deploying the PowerSwitch /// @param stakingToken address The address of the staking token for this geyser /// @param rewardToken address The address of the reward token for this geyser /// @param rewardScaling RewardScaling The config for reward scaling floor, ceiling, and time function initialize( address ownerAddress, address rewardPoolFactory, address powerSwitchFactory, address stakingToken, address rewardToken, RewardScaling calldata rewardScaling ) external initializer { // the scaling floor must be smaller than ceiling require(rewardScaling.floor <= rewardScaling.ceiling, "Geyser: floor above ceiling"); // setting rewardScalingTime to 0 would cause divide by zero error // to disable reward scaling, use rewardScalingFloor == rewardScalingCeiling require(rewardScaling.time != 0, "Geyser: scaling time cannot be zero"); // deploy power switch address powerSwitch = IFactory(powerSwitchFactory).create(abi.encode(ownerAddress)); // deploy reward pool address rewardPool = IFactory(rewardPoolFactory).create(abi.encode(powerSwitch)); // set internal configs OwnableUpgradeable.__Ownable_init(); OwnableUpgradeable.transferOwnership(ownerAddress); Powered._setPowerSwitch(powerSwitch); // commit to storage _geyser.stakingToken = stakingToken; _geyser.rewardToken = rewardToken; _geyser.rewardPool = rewardPool; _geyser.rewardScaling = rewardScaling; // emit event emit GeyserCreated(rewardPool, powerSwitch); } /* getter functions */ function getBonusTokenSetLength() external view override returns (uint256 length) { return _bonusTokenSet.length(); } function getBonusTokenAtIndex(uint256 index) external view override returns (address bonusToken) { return _bonusTokenSet.at(index); } function getVaultFactorySetLength() external view override returns (uint256 length) { return _vaultFactorySet.length(); } function getVaultFactoryAtIndex(uint256 index) external view override returns (address factory) { return _vaultFactorySet.at(index); } function isValidVault(address target) public view override returns (bool validity) { // validate target is created from whitelisted vault factory for (uint256 index = 0; index < _vaultFactorySet.length(); index++) { if (IInstanceRegistry(_vaultFactorySet.at(index)).isInstance(target)) { return true; } } // explicit return return false; } function isValidAddress(address target) public view override returns (bool validity) { // sanity check target for potential input errors return target != address(this) && target != address(0) && target != _geyser.stakingToken && target != _geyser.rewardToken && target != _geyser.rewardPool && !_bonusTokenSet.contains(target); } /* geyser getters */ function getGeyserData() external view override returns (GeyserData memory geyser) { return _geyser; } function getCurrentUnlockedRewards() public view override returns (uint256 unlockedRewards) { // calculate reward available based on state return getFutureUnlockedRewards(block.timestamp); } function getFutureUnlockedRewards(uint256 timestamp) public view override returns (uint256 unlockedRewards) { // get reward amount remaining uint256 remainingRewards = IERC20(_geyser.rewardToken).balanceOf(_geyser.rewardPool); // calculate reward available based on state unlockedRewards = calculateUnlockedRewards( _geyser.rewardSchedules, remainingRewards, _geyser.rewardSharesOutstanding, timestamp ); // explicit return return unlockedRewards; } function getCurrentTotalStakeUnits() public view override returns (uint256 totalStakeUnits) { // calculate new stake units return getFutureTotalStakeUnits(block.timestamp); } function getFutureTotalStakeUnits(uint256 timestamp) public view override returns (uint256 totalStakeUnits) { // return early if no change if (timestamp == _geyser.lastUpdate) return _geyser.totalStakeUnits; // calculate new stake units uint256 newStakeUnits = calculateStakeUnits(_geyser.totalStake, _geyser.lastUpdate, timestamp); // add to cached total totalStakeUnits = _geyser.totalStakeUnits.add(newStakeUnits); // explicit return return totalStakeUnits; } /* vault getters */ function getVaultData(address vault) external view override returns (VaultData memory vaultData) { return _vaults[vault]; } function getCurrentVaultReward(address vault) external view override returns (uint256 reward) { // calculate rewards return calculateRewardFromStakes( _vaults[vault] .stakes, _vaults[vault] .totalStake, getCurrentUnlockedRewards(), getCurrentTotalStakeUnits(), block .timestamp, _geyser .rewardScaling ) .reward; } function getFutureVaultReward(address vault, uint256 timestamp) external view override returns (uint256 reward) { // calculate rewards return calculateRewardFromStakes( _vaults[vault] .stakes, _vaults[vault] .totalStake, getFutureUnlockedRewards(timestamp), getFutureTotalStakeUnits(timestamp), timestamp, _geyser .rewardScaling ) .reward; } function getCurrentStakeReward(address vault, uint256 stakeAmount) external view override returns (uint256 reward) { // calculate rewards return calculateRewardFromStakes( _vaults[vault] .stakes, stakeAmount, getCurrentUnlockedRewards(), getCurrentTotalStakeUnits(), block .timestamp, _geyser .rewardScaling ) .reward; } function getFutureStakeReward( address vault, uint256 stakeAmount, uint256 timestamp ) external view override returns (uint256 reward) { // calculate rewards return calculateRewardFromStakes( _vaults[vault] .stakes, stakeAmount, getFutureUnlockedRewards(timestamp), getFutureTotalStakeUnits(timestamp), timestamp, _geyser .rewardScaling ) .reward; } function getCurrentVaultStakeUnits(address vault) public view override returns (uint256 stakeUnits) { // calculate stake units return getFutureVaultStakeUnits(vault, block.timestamp); } function getFutureVaultStakeUnits(address vault, uint256 timestamp) public view override returns (uint256 stakeUnits) { // calculate stake units return calculateTotalStakeUnits(_vaults[vault].stakes, timestamp); } /* pure functions */ function calculateTotalStakeUnits(StakeData[] memory stakes, uint256 timestamp) public pure override returns (uint256 totalStakeUnits) { for (uint256 index; index < stakes.length; index++) { // reference stake StakeData memory stakeData = stakes[index]; // calculate stake units uint256 stakeUnits = calculateStakeUnits(stakeData.amount, stakeData.timestamp, timestamp); // add to running total totalStakeUnits = totalStakeUnits.add(stakeUnits); } } function calculateStakeUnits( uint256 amount, uint256 start, uint256 end ) public pure override returns (uint256 stakeUnits) { // calculate duration uint256 duration = end.sub(start); // calculate stake units stakeUnits = duration.mul(amount); // explicit return return stakeUnits; } function calculateUnlockedRewards( RewardSchedule[] memory rewardSchedules, uint256 rewardBalance, uint256 sharesOutstanding, uint256 timestamp ) public pure override returns (uint256 unlockedRewards) { // return 0 if no registered schedules if (rewardSchedules.length == 0) { return 0; } // calculate reward shares locked across all reward schedules uint256 sharesLocked; for (uint256 index = 0; index < rewardSchedules.length; index++) { // fetch reward schedule storage reference RewardSchedule memory schedule = rewardSchedules[index]; // caculate amount of shares available on this schedule // if (now - start) < duration // sharesLocked = shares - (shares * (now - start) / duration) // else // sharesLocked = 0 uint256 currentSharesLocked = 0; if (timestamp.sub(schedule.start) < schedule.duration) { currentSharesLocked = schedule.shares.sub( schedule.shares.mul(timestamp.sub(schedule.start)).div(schedule.duration) ); } // add to running total sharesLocked = sharesLocked.add(currentSharesLocked); } // convert shares to reward // rewardLocked = sharesLocked * rewardBalance / sharesOutstanding uint256 rewardLocked = sharesLocked.mul(rewardBalance).div(sharesOutstanding); // calculate amount available // unlockedRewards = rewardBalance - rewardLocked unlockedRewards = rewardBalance.sub(rewardLocked); // explicit return return unlockedRewards; } function calculateRewardFromStakes( StakeData[] memory stakes, uint256 unstakeAmount, uint256 unlockedRewards, uint256 totalStakeUnits, uint256 timestamp, RewardScaling memory rewardScaling ) public pure override returns (RewardOutput memory out) { uint256 stakesToDrop = 0; while (unstakeAmount > 0) { // fetch vault stake storage reference StakeData memory lastStake = stakes[stakes.length.sub(stakesToDrop).sub(1)]; // calculate stake duration uint256 stakeDuration = timestamp.sub(lastStake.timestamp); uint256 currentAmount; if (lastStake.amount > unstakeAmount) { // set current amount to remaining unstake amount currentAmount = unstakeAmount; // amount of last stake is reduced out.lastStakeAmount = lastStake.amount.sub(unstakeAmount); } else { // set current amount to amount of last stake currentAmount = lastStake.amount; // add to stakes to drop stakesToDrop += 1; } // update remaining unstakeAmount unstakeAmount = unstakeAmount.sub(currentAmount); // calculate reward amount uint256 currentReward = calculateReward(unlockedRewards, currentAmount, stakeDuration, totalStakeUnits, rewardScaling); // update cumulative reward out.reward = out.reward.add(currentReward); // update cached unlockedRewards unlockedRewards = unlockedRewards.sub(currentReward); // calculate time weighted stake uint256 stakeUnits = currentAmount.mul(stakeDuration); // update cached totalStakeUnits totalStakeUnits = totalStakeUnits.sub(stakeUnits); } // explicit return return RewardOutput(out.lastStakeAmount, stakes.length.sub(stakesToDrop), out.reward, totalStakeUnits); } function calculateReward( uint256 unlockedRewards, uint256 stakeAmount, uint256 stakeDuration, uint256 totalStakeUnits, RewardScaling memory rewardScaling ) public pure override returns (uint256 reward) { // calculate time weighted stake uint256 stakeUnits = stakeAmount.mul(stakeDuration); // calculate base reward // baseReward = unlockedRewards * stakeUnits / totalStakeUnits uint256 baseReward = 0; if (totalStakeUnits != 0) { // scale reward according to proportional weight baseReward = unlockedRewards.mul(stakeUnits).div(totalStakeUnits); } // calculate scaled reward // if no scaling or scaling period completed // reward = baseReward // else // minReward = baseReward * scalingFloor / scalingCeiling // bonusReward = baseReward // * (scalingCeiling - scalingFloor) / scalingCeiling // * duration / scalingTime // reward = minReward + bonusReward if (stakeDuration >= rewardScaling.time || rewardScaling.floor == rewardScaling.ceiling) { // no reward scaling applied reward = baseReward; } else { // calculate minimum reward using scaling floor uint256 minReward = baseReward.mul(rewardScaling.floor).div(rewardScaling.ceiling); // calculate bonus reward with vested portion of scaling factor uint256 bonusReward = baseReward .mul(stakeDuration) .mul(rewardScaling.ceiling.sub(rewardScaling.floor)) .div(rewardScaling.ceiling) .div(rewardScaling.time); // add minimum reward and bonus reward reward = minReward.add(bonusReward); } // explicit return return reward; } /* admin functions */ /// @notice Add funds to the geyser /// access control: only admin /// state machine: /// - can be called multiple times /// - only online /// state scope: /// - increase _geyser.rewardSharesOutstanding /// - append to _geyser.rewardSchedules /// token transfer: transfer staking tokens from msg.sender to reward pool /// @param amount uint256 Amount of reward tokens to deposit /// @param duration uint256 Duration over which to linearly unlock rewards function fundGeyser(uint256 amount, uint256 duration) external onlyOwner onlyOnline { // validate duration require(duration != 0, "Geyser: invalid duration"); // create new reward shares // if existing rewards on this geyser // mint new shares proportional to % change in rewards remaining // newShares = remainingShares * newReward / remainingRewards // else // mint new shares with BASE_SHARES_PER_WEI initial conversion rate // store as fixed point number with same of decimals as reward token uint256 newRewardShares; if (_geyser.rewardSharesOutstanding > 0) { uint256 remainingRewards = IERC20(_geyser.rewardToken).balanceOf(_geyser.rewardPool); newRewardShares = _geyser.rewardSharesOutstanding.mul(amount).div(remainingRewards); } else { newRewardShares = amount.mul(BASE_SHARES_PER_WEI); } // add reward shares to total _geyser.rewardSharesOutstanding = _geyser.rewardSharesOutstanding.add(newRewardShares); // store new reward schedule _geyser.rewardSchedules.push(RewardSchedule(duration, block.timestamp, newRewardShares)); // transfer reward tokens to reward pool TransferHelper.safeTransferFrom(_geyser.rewardToken, msg.sender, _geyser.rewardPool, amount); // emit event emit GeyserFunded(amount, duration); } /// @notice Add vault factory to whitelist /// @dev use this function to enable stakes to vaults coming from the specified /// factory contract /// access control: only admin /// state machine: /// - can be called multiple times /// - not shutdown /// state scope: /// - append to _vaultFactorySet /// token transfer: none /// @param factory address The address of the vault factory function registerVaultFactory(address factory) external onlyOwner notShutdown { // add factory to set require(_vaultFactorySet.add(factory), "Geyser: vault factory already registered"); // emit event emit VaultFactoryRegistered(factory); } /// @notice Remove vault factory from whitelist /// @dev use this function to disable new stakes to vaults coming from the specified /// factory contract. /// note: vaults with existing stakes from this factory are sill able to unstake /// access control: only admin /// state machine: /// - can be called multiple times /// - not shutdown /// state scope: /// - remove from _vaultFactorySet /// token transfer: none /// @param factory address The address of the vault factory function removeVaultFactory(address factory) external onlyOwner notShutdown { // remove factory from set require(_vaultFactorySet.remove(factory), "Geyser: vault factory not registered"); // emit event emit VaultFactoryRemoved(factory); } /// @notice Register bonus token for distribution /// @dev use this function to enable distribution of any ERC20 held by the RewardPool contract /// access control: only admin /// state machine: /// - can be called multiple times /// - only online /// state scope: /// - append to _bonusTokenSet /// token transfer: none /// @param bonusToken address The address of the bonus token function registerBonusToken(address bonusToken) external onlyOwner onlyOnline { // verify valid bonus token _validateAddress(bonusToken); // verify bonus token count require(_bonusTokenSet.length() < MAX_REWARD_TOKENS, "Geyser: max bonus tokens reached "); // add token to set assert(_bonusTokenSet.add(bonusToken)); // emit event emit BonusTokenRegistered(bonusToken); } /// @notice Rescue tokens from RewardPool /// @dev use this function to rescue tokens from RewardPool contract /// without distributing to stakers or triggering emergency shutdown /// access control: only admin /// state machine: /// - can be called multiple times /// - only online /// state scope: none /// token transfer: transfer requested token from RewardPool to recipient /// @param token address The address of the token to rescue /// @param recipient address The address of the recipient /// @param amount uint256 The amount of tokens to rescue function rescueTokensFromRewardPool( address token, address recipient, uint256 amount ) external onlyOwner onlyOnline { // verify recipient _validateAddress(recipient); // check not attempting to unstake reward token require(token != _geyser.rewardToken, "Geyser: invalid address"); // check not attempting to wthdraw bonus token require(!_bonusTokenSet.contains(token), "Geyser: invalid address"); // transfer tokens to recipient IRewardPool(_geyser.rewardPool).sendERC20(token, recipient, amount); } /* user functions */ /// @notice Stake tokens /// access control: anyone with a valid permission /// state machine: /// - can be called multiple times /// - only online /// - when vault exists on this geyser /// state scope: /// - append to _vaults[vault].stakes /// - increase _vaults[vault].totalStake /// - increase _geyser.totalStake /// - increase _geyser.totalStakeUnits /// - increase _geyser.lastUpdate /// token transfer: transfer staking tokens from msg.sender to vault /// @param vault address The address of the vault to stake from /// @param amount uint256 The amount of staking tokens to stake /// @param permission bytes The signed lock permission for the universal vault function stake( address vault, uint256 amount, bytes calldata permission ) external override onlyOnline { // verify vault is valid require(isValidVault(vault), "Geyser: vault is not registered"); // verify non-zero amount require(amount != 0, "Geyser: no amount staked"); // fetch vault storage reference VaultData storage vaultData = _vaults[vault]; // verify stakes boundary not reached require(vaultData.stakes.length < MAX_STAKES_PER_VAULT, "Geyser: MAX_STAKES_PER_VAULT reached"); // update cached sum of stake units across all vaults _updateTotalStakeUnits(); // store amount and timestamp vaultData.stakes.push(StakeData(amount, block.timestamp)); // update cached total vault and geyser amounts vaultData.totalStake = vaultData.totalStake.add(amount); _geyser.totalStake = _geyser.totalStake.add(amount); // call lock on vault IUniversalVault(vault).lock(_geyser.stakingToken, amount, permission); // emit event emit Staked(vault, amount); } /// @notice Unstake staking tokens and claim reward /// @dev rewards can only be claimed when unstaking, thus reseting the reward multiplier /// access control: anyone with a valid permission /// state machine: /// - when vault exists on this geyser /// - after stake from vault /// - can be called multiple times while sufficient stake remains /// - only online /// state scope: /// - decrease _geyser.rewardSharesOutstanding /// - decrease _geyser.totalStake /// - increase _geyser.lastUpdate /// - modify _geyser.totalStakeUnits /// - modify _vaults[vault].stakes /// - decrease _vaults[vault].totalStake /// token transfer: /// - transfer reward tokens from reward pool to recipient /// - transfer bonus tokens from reward pool to recipient /// @param vault address The vault to unstake from /// @param amount uint256 The amount of staking tokens to unstake /// @param permission bytes The signed unlock permission for the universal vault function unstakeAndClaim( address vault, uint256 amount, bytes calldata permission ) external override onlyOnline { // fetch vault storage reference VaultData storage vaultData = _vaults[vault]; // verify non-zero amount require(amount != 0, "Geyser: no amount unstaked"); // check for sufficient vault stake amount require(vaultData.totalStake >= amount, "Geyser: insufficient vault stake"); // check for sufficient geyser stake amount // if this check fails, there is a bug in stake accounting assert(_geyser.totalStake >= amount); // update cached sum of stake units across all vaults _updateTotalStakeUnits(); // get reward amount remaining uint256 remainingRewards = IERC20(_geyser.rewardToken).balanceOf(_geyser.rewardPool); // calculate vested portion of reward pool uint256 unlockedRewards = calculateUnlockedRewards( _geyser.rewardSchedules, remainingRewards, _geyser.rewardSharesOutstanding, block.timestamp ); // calculate vault time weighted reward with scaling RewardOutput memory out = calculateRewardFromStakes( vaultData.stakes, amount, unlockedRewards, _geyser.totalStakeUnits, block.timestamp, _geyser.rewardScaling ); // update stake data in storage if (out.newStakesCount == 0) { // all stakes have been unstaked delete vaultData.stakes; } else { // some stakes have been completely or partially unstaked // delete fully unstaked stakes while (vaultData.stakes.length > out.newStakesCount) vaultData.stakes.pop(); // only perform when lastStakeAmount is set if (out.lastStakeAmount > 0) { // update partially unstaked stake vaultData.stakes[out.newStakesCount.sub(1)].amount = out.lastStakeAmount; } } // update cached stake totals vaultData.totalStake = vaultData.totalStake.sub(amount); _geyser.totalStake = _geyser.totalStake.sub(amount); _geyser.totalStakeUnits = out.newTotalStakeUnits; // unlock staking tokens from vault IUniversalVault(vault).unlock(_geyser.stakingToken, amount, permission); // emit event emit Unstaked(vault, amount); // only perform on non-zero reward if (out.reward > 0) { // calculate shares to burn // sharesToBurn = sharesOutstanding * reward / remainingRewards uint256 sharesToBurn = _geyser.rewardSharesOutstanding.mul(out.reward).div(remainingRewards); // burn claimed shares _geyser.rewardSharesOutstanding = _geyser.rewardSharesOutstanding.sub(sharesToBurn); // transfer bonus tokens from reward pool to recipient if (_bonusTokenSet.length() > 0) { for (uint256 index = 0; index < _bonusTokenSet.length(); index++) { // fetch bonus token address reference address bonusToken = _bonusTokenSet.at(index); // calculate bonus token amount // bonusAmount = bonusRemaining * reward / remainingRewards uint256 bonusAmount = IERC20(bonusToken).balanceOf(_geyser.rewardPool).mul(out.reward).div(remainingRewards); // transfer if amount is non-zero if (bonusAmount > 0) { // transfer bonus token IRewardPool(_geyser.rewardPool).sendERC20(bonusToken, vault, bonusAmount); // emit event emit RewardClaimed(vault, bonusToken, bonusAmount); } } } // transfer reward tokens from reward pool to recipient IRewardPool(_geyser.rewardPool).sendERC20(_geyser.rewardToken, vault, out.reward); // emit event emit RewardClaimed(vault, _geyser.rewardToken, out.reward); } } /// @notice Exit geyser without claiming reward /// @dev This function should never revert when correctly called by the vault. /// A max number of stakes per vault is set with MAX_STAKES_PER_VAULT to /// place an upper bound on the for loop in calculateTotalStakeUnits(). /// access control: only callable by the vault directly /// state machine: /// - when vault exists on this geyser /// - when active stake from this vault /// - any power state /// state scope: /// - decrease _geyser.totalStake /// - increase _geyser.lastUpdate /// - modify _geyser.totalStakeUnits /// - delete _vaults[vault] /// token transfer: none function rageQuit() external override { // fetch vault storage reference VaultData storage _vaultData = _vaults[msg.sender]; // revert if no active stakes require(_vaultData.stakes.length != 0, "Geyser: no stake"); // update cached sum of stake units across all vaults _updateTotalStakeUnits(); // emit event emit Unstaked(msg.sender, _vaultData.totalStake); // update cached totals _geyser.totalStake = _geyser.totalStake.sub(_vaultData.totalStake); _geyser.totalStakeUnits = _geyser.totalStakeUnits.sub( calculateTotalStakeUnits(_vaultData.stakes, block.timestamp) ); // delete stake data delete _vaults[msg.sender]; } /* convenience functions */ function _updateTotalStakeUnits() private { // update cached totalStakeUnits _geyser.totalStakeUnits = getCurrentTotalStakeUnits(); // update cached lastUpdate _geyser.lastUpdate = block.timestamp; } function _validateAddress(address target) private view { // sanity check target for potential input errors require(isValidAddress(target), "Geyser: invalid address"); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @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 { /** * @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) { // Check the signature length if (signature.length != 65) { revert("ECDSA: invalid signature length"); } // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. // solhint-disable-next-line no-inline-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`, * `r` and `s` signature fields separately. */ function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) { // 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 (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): 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. require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value"); require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "ECDSA: invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * replicates the behavior of the * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`] * JSON-RPC method. * * 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)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; import "../../introspection/IERC165.sol"; /** * @dev Required interface of an ERC721 compliant contract. */ interface IERC721 is IERC165 { /** * @dev Emitted when `tokenId` token is transferred from `from` to `to`. */ event Transfer(address indexed from, address indexed to, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token. */ event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId); /** * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets. */ event ApprovalForAll(address indexed owner, address indexed operator, bool approved); /** * @dev Returns the number of tokens in ``owner``'s account. */ function balanceOf(address owner) external view returns (uint256 balance); /** * @dev Returns the owner of the `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function ownerOf(uint256 tokenId) external view returns (address owner); /** * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients * are aware of the ERC721 protocol to prevent tokens from being forever locked. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId) external; /** * @dev Transfers `tokenId` token from `from` to `to`. * * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * * Emits a {Transfer} event. */ function transferFrom(address from, address to, uint256 tokenId) external; /** * @dev Gives permission to `to` to transfer `tokenId` token to another account. * The approval is cleared when the token is transferred. * * Only a single account can be approved at a time, so approving the zero address clears previous approvals. * * Requirements: * * - The caller must own the token or be an approved operator. * - `tokenId` must exist. * * Emits an {Approval} event. */ function approve(address to, uint256 tokenId) external; /** * @dev Returns the account approved for `tokenId` token. * * Requirements: * * - `tokenId` must exist. */ function getApproved(uint256 tokenId) external view returns (address operator); /** * @dev Approve or remove `operator` as an operator for the caller. * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller. * * Requirements: * * - The `operator` cannot be the caller. * * Emits an {ApprovalForAll} event. */ function setApprovalForAll(address operator, bool _approved) external; /** * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`. * * See {setApprovalForAll} */ function isApprovedForAll(address owner, address operator) external view returns (bool); /** * @dev Safely transfers `tokenId` token from `from` to `to`. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `tokenId` token must exist and be owned by `from`. * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}. * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer. * * Emits a {Transfer} event. */ function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @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 ^0.7.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal initializer { __Context_init_unchained(); __Ownable_init_unchained(); } function __Ownable_init_unchained() internal initializer { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } uint256[49] private __gap; }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; import {TransferHelper} from "@uniswap/lib/contracts/libraries/TransferHelper.sol"; import {Powered} from "./PowerSwitch/Powered.sol"; interface IRewardPool { function sendERC20( address token, address to, uint256 value ) external; function rescueERC20(address[] calldata tokens, address recipient) external; } /// @title Reward Pool /// @notice Vault for isolated storage of reward tokens /// @dev Security contact: [email protected] contract RewardPool is IRewardPool, Powered, Ownable { /* initializer */ constructor(address powerSwitch) { Powered._setPowerSwitch(powerSwitch); } /* user functions */ /// @notice Send an ERC20 token /// access control: only owner /// state machine: /// - can be called multiple times /// - only online /// state scope: none /// token transfer: transfer tokens from self to recipient /// @param token address The token to send /// @param to address The recipient to send to /// @param value uint256 Amount of tokens to send function sendERC20( address token, address to, uint256 value ) external override onlyOwner onlyOnline { TransferHelper.safeTransfer(token, to, value); } /* emergency functions */ /// @notice Rescue multiple ERC20 tokens /// access control: only power controller /// state machine: /// - can be called multiple times /// - only shutdown /// state scope: none /// token transfer: transfer tokens from self to recipient /// @param tokens address[] The tokens to rescue /// @param recipient address The recipient to rescue to function rescueERC20(address[] calldata tokens, address recipient) external override onlyShutdown { // only callable by controller require(msg.sender == Powered.getPowerController(), "RewardPool: only controller can withdraw after shutdown"); // assert recipient is defined require(recipient != address(0), "RewardPool: recipient not defined"); // transfer tokens for (uint256 index = 0; index < tokens.length; index++) { // get token address token = tokens[index]; // get balance uint256 balance = IERC20(token).balanceOf(address(this)); // transfer token TransferHelper.safeTransfer(token, recipient, balance); } } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; interface IFactory { function create(bytes calldata args) external returns (address instance); function create2(bytes calldata args, bytes32 salt) external returns (address instance); }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {EnumerableSet} from "@openzeppelin/contracts/utils/EnumerableSet.sol"; interface IInstanceRegistry { /* events */ event InstanceAdded(address instance); event InstanceRemoved(address instance); /* view functions */ function isInstance(address instance) external view returns (bool validity); function instanceCount() external view returns (uint256 count); function instanceAt(uint256 index) external view returns (address instance); } /// @title InstanceRegistry /// @dev Security contact: [email protected] contract InstanceRegistry is IInstanceRegistry { using EnumerableSet for EnumerableSet.AddressSet; /* storage */ EnumerableSet.AddressSet private _instanceSet; /* view functions */ function isInstance(address instance) external view override returns (bool validity) { return _instanceSet.contains(instance); } function instanceCount() external view override returns (uint256 count) { return _instanceSet.length(); } function instanceAt(uint256 index) external view override returns (address instance) { return _instanceSet.at(index); } /* admin functions */ function _register(address instance) internal { require(_instanceSet.add(instance), "InstanceRegistry: already registered"); emit InstanceAdded(instance); } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {IPowerSwitch} from "./PowerSwitch.sol"; interface IPowered { function isOnline() external view returns (bool status); function isOffline() external view returns (bool status); function isShutdown() external view returns (bool status); function getPowerSwitch() external view returns (address powerSwitch); function getPowerController() external view returns (address controller); } /// @title Powered /// @notice Helper for calling external PowerSwitch /// @dev Security contact: [email protected] contract Powered is IPowered { /* storage */ address private _powerSwitch; /* modifiers */ modifier onlyOnline() { _onlyOnline(); _; } modifier onlyOffline() { _onlyOffline(); _; } modifier notShutdown() { _notShutdown(); _; } modifier onlyShutdown() { _onlyShutdown(); _; } /* initializer */ function _setPowerSwitch(address powerSwitch) internal { _powerSwitch = powerSwitch; } /* getter functions */ function isOnline() public view override returns (bool status) { return IPowerSwitch(_powerSwitch).isOnline(); } function isOffline() public view override returns (bool status) { return IPowerSwitch(_powerSwitch).isOffline(); } function isShutdown() public view override returns (bool status) { return IPowerSwitch(_powerSwitch).isShutdown(); } function getPowerSwitch() public view override returns (address powerSwitch) { return _powerSwitch; } function getPowerController() public view override returns (address controller) { return IPowerSwitch(_powerSwitch).getPowerController(); } /* convenience functions */ function _onlyOnline() private view { require(isOnline(), "Powered: is not online"); } function _onlyOffline() private view { require(isOffline(), "Powered: is not offline"); } function _notShutdown() private view { require(!isShutdown(), "Powered: is shutdown"); } function _onlyShutdown() private view { require(isShutdown(), "Powered: is not shutdown"); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../proxy/Initializable.sol"; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract ContextUpgradeable is Initializable { function __Context_init() internal initializer { __Context_init_unchained(); } function __Context_init_unchained() internal initializer { } function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT // solhint-disable-next-line compiler-version pragma solidity >=0.4.24 <0.8.0; import "../utils/AddressUpgradeable.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function _isConstructor() private view returns (bool) { return !AddressUpgradeable.isContract(address(this)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @dev Collection of functions related to the address type */ library AddressUpgradeable { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; 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 () { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: GPL-3.0-only pragma solidity 0.7.6; import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol"; interface IPowerSwitch { /* admin events */ event PowerOn(); event PowerOff(); event EmergencyShutdown(); /* data types */ enum State {Online, Offline, Shutdown} /* admin functions */ function powerOn() external; function powerOff() external; function emergencyShutdown() external; /* view functions */ function isOnline() external view returns (bool status); function isOffline() external view returns (bool status); function isShutdown() external view returns (bool status); function getStatus() external view returns (State status); function getPowerController() external view returns (address controller); } /// @title PowerSwitch /// @notice Standalone pausing and emergency stop functionality /// @dev Security contact: [email protected] contract PowerSwitch is IPowerSwitch, Ownable { /* storage */ IPowerSwitch.State private _status; /* initializer */ constructor(address owner) { // sanity check owner require(owner != address(0), "PowerSwitch: invalid owner"); // transfer ownership Ownable.transferOwnership(owner); } /* admin functions */ /// @notice Turn Power On /// access control: only admin /// state machine: only when offline /// state scope: only modify _status /// token transfer: none function powerOn() external override onlyOwner { require(_status == IPowerSwitch.State.Offline, "PowerSwitch: cannot power on"); _status = IPowerSwitch.State.Online; emit PowerOn(); } /// @notice Turn Power Off /// access control: only admin /// state machine: only when online /// state scope: only modify _status /// token transfer: none function powerOff() external override onlyOwner { require(_status == IPowerSwitch.State.Online, "PowerSwitch: cannot power off"); _status = IPowerSwitch.State.Offline; emit PowerOff(); } /// @notice Shutdown Permanently /// access control: only admin /// state machine: /// - when online or offline /// - can only be called once /// state scope: only modify _status /// token transfer: none function emergencyShutdown() external override onlyOwner { require(_status != IPowerSwitch.State.Shutdown, "PowerSwitch: cannot shutdown"); _status = IPowerSwitch.State.Shutdown; emit EmergencyShutdown(); } /* getter functions */ function isOnline() external view override returns (bool status) { return _status == State.Online; } function isOffline() external view override returns (bool status) { return _status == State.Offline; } function isShutdown() external view override returns (bool status) { return _status == State.Shutdown; } function getStatus() external view override returns (IPowerSwitch.State status) { return _status; } function getPowerController() external view override returns (address controller) { return Ownable.owner(); } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} }
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IUniversalVault.LockData","name":"lockData","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLockSetCount","outputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getNonce","outputs":[{"internalType":"uint256","name":"nonce","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"eip712TypeHash","type":"bytes32"},{"internalType":"address","name":"delegate","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"}],"name":"getPermissionHash","outputs":[{"internalType":"bytes32","name":"permissionHash","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initializeLock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"permissionHash","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"isValidSignature","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"permission","type":"bytes"}],"name":"lock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"nft","outputs":[{"internalType":"address","name":"nftAddress","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"ownerAddress","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"delegate","type":"address"},{"internalType":"address","name":"token","type":"address"}],"name":"rageQuit","outputs":[{"internalType":"bool","name":"notified","type":"bool"},{"internalType":"string","name":"error","type":"string"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"permission","type":"bytes"}],"name":"unlock","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.