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73 lines
2.3 KiB
Solidity
73 lines
2.3 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/utils/TokenTimelock.sol)
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pragma solidity ^0.8.0;
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import "./SafeERC20.sol";
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/**
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* @dev A token holder contract that will allow a beneficiary to extract the
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* tokens after a given release time.
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*
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* Useful for simple vesting schedules like "advisors get all of their tokens
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* after 1 year".
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*/
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contract TokenTimelock {
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using SafeERC20 for IERC20;
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// ERC20 basic token contract being held
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IERC20 private immutable _token;
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// beneficiary of tokens after they are released
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address private immutable _beneficiary;
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// timestamp when token release is enabled
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uint256 private immutable _releaseTime;
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/**
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* @dev Deploys a timelock instance that is able to hold the token specified, and will only release it to
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* `beneficiary_` when {release} is invoked after `releaseTime_`. The release time is specified as a Unix timestamp
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* (in seconds).
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*/
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constructor(IERC20 token_, address beneficiary_, uint256 releaseTime_) {
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require(releaseTime_ > block.timestamp, "TokenTimelock: release time is before current time");
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_token = token_;
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_beneficiary = beneficiary_;
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_releaseTime = releaseTime_;
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}
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/**
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* @dev Returns the token being held.
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*/
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function token() public view virtual returns (IERC20) {
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return _token;
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}
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/**
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* @dev Returns the beneficiary that will receive the tokens.
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*/
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function beneficiary() public view virtual returns (address) {
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return _beneficiary;
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}
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/**
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* @dev Returns the time when the tokens are released in seconds since Unix epoch (i.e. Unix timestamp).
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*/
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function releaseTime() public view virtual returns (uint256) {
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return _releaseTime;
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}
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/**
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* @dev Transfers tokens held by the timelock to the beneficiary. Will only succeed if invoked after the release
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* time.
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*/
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function release() public virtual {
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require(block.timestamp >= releaseTime(), "TokenTimelock: current time is before release time");
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uint256 amount = token().balanceOf(address(this));
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require(amount > 0, "TokenTimelock: no tokens to release");
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token().safeTransfer(beneficiary(), amount);
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}
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}
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