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Minimal Proxy Contract for 0xf8504e92428d65e56e495684a38f679c1b1dc30b
Contract Name:
Vesting
Compiler Version
v0.8.6+commit.11564f7e
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/utils/math/Math.sol"; import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; import "@openzeppelin/contracts/utils/Context.sol"; import "./SimpleGovernance.sol"; /** * @title Vesting * @dev A token holder contract that can release its token balance gradually like a * typical vesting scheme, with a cliff and vesting period. Owner has the power * to change the beneficiary who receives the vested tokens. */ contract Vesting is Initializable, Context { using SafeERC20 for IERC20; event Released(uint256 amount); event VestingInitialized( address indexed beneficiary, uint256 startTimestamp, uint256 cliff, uint256 duration ); event SetBeneficiary(address indexed beneficiary); // beneficiary of tokens after they are released address public beneficiary; IERC20 public token; uint256 public cliffInSeconds; uint256 public durationInSeconds; uint256 public startTimestamp; uint256 public released; /** * @dev Sets the beneficiary to _msgSender() on deploying this contract. This prevents others from * initializing the logic contract. */ constructor() public { beneficiary = _msgSender(); } /** * @dev Limits certain functions to be called by governance */ modifier onlyGovernance() { require( _msgSender() == governance(), "only governance can perform this action" ); _; } /** * @dev Initializes a vesting contract that vests its balance of any ERC20 token to the * _beneficiary, monthly in a linear fashion until duration has passed. By then all * of the balance will have vested. * @param _token address of the token that is subject to vesting * @param _beneficiary address of the beneficiary to whom vested tokens are transferred * @param _cliffInSeconds duration in months of the cliff in which tokens will begin to vest * @param _durationInSeconds duration in months of the period in which the tokens will vest * @param _startTimestamp start timestamp when the cliff and vesting should start to count */ function initialize( address _token, address _beneficiary, uint256 _startTimestamp, uint256 _cliffInSeconds, uint256 _durationInSeconds ) external initializer { require(_token != address(0), "_token cannot be empty"); // dev: beneficiary is set to msg.sender on logic contracts during deployment require(beneficiary == address(0), "cannot initialize logic contract"); require(_beneficiary != address(0), "_beneficiary cannot be empty"); require(_startTimestamp != 0, "startTimestamp cannot be 0"); require( _startTimestamp <= block.timestamp, "startTimestamp cannot be from the future" ); require(_durationInSeconds != 0, "duration cannot be 0"); require( _cliffInSeconds <= _durationInSeconds, "cliff is greater than duration" ); token = IERC20(_token); beneficiary = _beneficiary; startTimestamp = _startTimestamp; durationInSeconds = _durationInSeconds; cliffInSeconds = _cliffInSeconds; emit VestingInitialized( _beneficiary, _startTimestamp, _cliffInSeconds, _durationInSeconds ); } /** * @notice Transfers vested tokens to beneficiary. */ function release() external { uint256 vested = vestedAmount(); require(vested > 0, "No tokens to release"); released = released + vested; emit Released(vested); token.safeTransfer(beneficiary, vested); } /** * @notice Calculates the amount that has already vested but hasn't been released yet. */ function vestedAmount() public view returns (uint256) { uint256 blockTimestamp = block.timestamp; uint256 _durationInSeconds = durationInSeconds; uint256 elapsedTime = blockTimestamp - startTimestamp; // @dev startTimestamp is always less than blockTimestamp if (elapsedTime < cliffInSeconds) { return 0; } // If over vesting duration, all tokens vested if (elapsedTime >= _durationInSeconds) { return token.balanceOf(address(this)); } else { uint256 currentBalance = token.balanceOf(address(this)); // If there are no tokens in this contract yet, return 0. if (currentBalance == 0) { return 0; } uint256 totalBalance = currentBalance + released; uint256 vested = (totalBalance * elapsedTime) / _durationInSeconds; uint256 unreleased = vested - released; return unreleased; } } /** * @notice Changes beneficiary who receives the vested token. * @dev Only governance can call this function. This is to be used in case the target address * needs to be updated. If the previous beneficiary has any unclaimed tokens, the new beneficiary * will be able to claim them and the rest of the vested tokens. * @param newBeneficiary new address to become the beneficiary */ function changeBeneficiary(address newBeneficiary) external onlyGovernance { require( newBeneficiary != beneficiary, "beneficiary must be different from current one" ); require(newBeneficiary != address(0), "beneficiary cannot be empty"); beneficiary = newBeneficiary; emit SetBeneficiary(newBeneficiary); } /** * @notice Governance who owns this contract. * @dev Governance of the token contract also owns this vesting contract. */ function governance() public view returns (address) { return SimpleGovernance(address(token)).governance(); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @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 {ERC1967Proxy-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 || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } 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 assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Standard math utilities missing in the Solidity language. */ library Math { /** * @dev Returns the largest of two numbers. */ function max(uint256 a, uint256 b) internal pure returns (uint256) { return a >= b ? a : b; } /** * @dev Returns the smallest of two numbers. */ function min(uint256 a, uint256 b) internal pure returns (uint256) { return a < b ? a : b; } /** * @dev Returns the average of two numbers. The result is rounded towards * zero. */ function average(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b) / 2 can overflow, so we distribute. return (a / 2) + (b / 2) + (((a % 2) + (b % 2)) / 2); } /** * @dev Returns the ceiling of the division of two numbers. * * This differs from standard division with `/` in that it rounds up instead * of rounding down. */ function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) { // (a + b - 1) / b can overflow on addition, so we distribute. return a / b + (a % b == 0 ? 0 : 1); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import "@openzeppelin/contracts/utils/Context.sol"; abstract contract SimpleGovernance is Context { address public governance; address public pendingGovernance; event SetGovernance(address indexed governance); /** * @notice Changes governance of this contract */ modifier onlyGovernance() { require( _msgSender() == governance, "only governance can perform this action" ); _; } /** * @notice Changes governance of this contract * @dev Only governance can call this function. The new governance must call `acceptGovernance` after. * @param newGovernance new address to become the governance */ function changeGovernance(address newGovernance) external onlyGovernance { require( newGovernance != governance, "governance must be different from current one" ); require(newGovernance != address(0), "governance cannot be empty"); pendingGovernance = newGovernance; } /** * @notice Accept the new role of governance * @dev `changeGovernance` must be called first to set `pendingGovernance` */ function acceptGovernance() external { address _pendingGovernance = pendingGovernance; require( _pendingGovernance != address(0), "changeGovernance must be called first" ); require( _msgSender() == _pendingGovernance, "only pendingGovernance can accept this role" ); pendingGovernance = address(0); governance = _msgSender(); emit SetGovernance(_msgSender()); } }
{ "evmVersion": "berlin", "libraries": {}, "metadata": { "bytecodeHash": "ipfs", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 10000 }, "remappings": [], "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Released","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"}],"name":"SetBeneficiary","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"beneficiary","type":"address"},{"indexed":false,"internalType":"uint256","name":"startTimestamp","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"cliff","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"duration","type":"uint256"}],"name":"VestingInitialized","type":"event"},{"inputs":[],"name":"beneficiary","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newBeneficiary","type":"address"}],"name":"changeBeneficiary","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"cliffInSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"durationInSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"governance","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_beneficiary","type":"address"},{"internalType":"uint256","name":"_startTimestamp","type":"uint256"},{"internalType":"uint256","name":"_cliffInSeconds","type":"uint256"},{"internalType":"uint256","name":"_durationInSeconds","type":"uint256"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"release","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"released","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vestedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]
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