Forkchoice Ethereum Mainnet

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

pragma solidity ^0.8.0;

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

pragma solidity ^0.8.0;

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

pragma solidity ^0.8.0;

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);
}

pragma solidity ^0.8.0;

contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

pragma solidity ^0.8.0;

library SafeMath {
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}
pragma solidity ^0.8.11;

contract Token is ERC20, Ownable {
    using SafeMath for uint256;
    
    struct VestingSchedule{
        bool initialized;
        address  beneficiary;
        uint256  cliff;
        uint256  start;
        uint256  duration;
        uint256 slicePeriodSeconds;
        bool  revocable;
        uint256 amountTotal;
        uint256  released;
        bool revoked;
    }

    bytes32[] private vestingSchedulesIds;
    mapping(bytes32 => VestingSchedule) private vestingSchedules;
    uint256 private vestingSchedulesTotalAmount;
    mapping(address => uint256) private holdersVestingCount;

    event Released(uint256 amount);
    event Revoked(bytes32);
    event VestingCreated(bytes32, address, uint256);

    modifier onlyIfVestingScheduleExists(bytes32 vestingScheduleId) {
        require(vestingSchedules[vestingScheduleId].initialized == true, "not intialized");
        _;
    }

    modifier onlyIfVestingScheduleNotRevoked(bytes32 vestingScheduleId) {
        require(vestingSchedules[vestingScheduleId].initialized == true, "not intialized");
        require(vestingSchedules[vestingScheduleId].revoked == false, "already revoked");
        _;
    }

    constructor(
        string memory name,
        string memory symbol,
        uint256 initialSupply
    ) ERC20(name, symbol) {
        _mint(msg.sender, initialSupply);
    }

    receive() external payable {}

    fallback() external payable {}

    function getVestingSchedulesCountByBeneficiary(address _beneficiary)
    public
    view
    returns(uint256){
        return holdersVestingCount[_beneficiary];
    }

    function getVestingIdAtIndex(uint256 index)
    external
    view
    returns(bytes32){
        require(index < getVestingSchedulesCount(), "index out of bounds");
        return vestingSchedulesIds[index];
    }

    function getVestingScheduleByAddressAndIndex(address holder, uint256 index)
    public
    view
    returns(VestingSchedule memory){
        return getVestingSchedule(computeVestingScheduleIdForAddressAndIndex(holder, index));
    }

    function getVestingSchedulesTotalAmount()
    external
    view
    returns(uint256){
        return vestingSchedulesTotalAmount;
    }

    function createVestingSchedule(
        address _beneficiary,
        uint256 _start,
        uint256 _cliff,
        uint256 _duration,
        uint256 _slicePeriodSeconds,
        bool _revocable,
        uint256 _amount
    ) onlyOwner() public {
        require(_duration > 0, "duration must be > 0");
        require(_amount > 0, "amount must be > 0");
        require(_cliff <= _duration, "invalid cliff");
        require(_slicePeriodSeconds >= 1, "slicePeriodSeconds must be >= 1");

        bytes32 vestingScheduleId = this.computeNextVestingScheduleIdForHolder(_beneficiary);
        uint256 cliff = _start.add(_cliff);
        vestingSchedules[vestingScheduleId] = VestingSchedule(
            true,
            _beneficiary,
            cliff,
            _start,
            _duration,
            _slicePeriodSeconds,
            _revocable,
            _amount,
            0,
            false
        );
        vestingSchedulesTotalAmount = vestingSchedulesTotalAmount.add(_amount);
        vestingSchedulesIds.push(vestingScheduleId);
        uint256 currentVestingCount = holdersVestingCount[_beneficiary];
        holdersVestingCount[_beneficiary] = currentVestingCount.add(1);

        emit VestingCreated(vestingScheduleId, _beneficiary, _amount);
    }

    function getVestingSchedulesCount()
        public
        view
        returns(uint256){
        return vestingSchedulesIds.length;
    }

    function computeReleasableAmount(bytes32 vestingScheduleId)
        public
        onlyIfVestingScheduleNotRevoked(vestingScheduleId)
        view
        returns(uint256){
        VestingSchedule storage vestingSchedule = vestingSchedules[vestingScheduleId];
        return _computeReleasableAmount(vestingSchedule);
    }

    function computeLockedAmount(address holder)
        public
        view
        returns(uint256) {
        uint count = getVestingSchedulesCountByBeneficiary(holder);
        require(count <= getVestingSchedulesCount(), "index out of bounds");
        uint totalLocked = 0;
        for (uint i = 0; i < count; i++) {
            VestingSchedule memory vestingSchedule = getVestingScheduleByAddressAndIndex(holder, i);
            
            uint256 lockedAmount = _computeLockedAmount(vestingSchedule);
            totalLocked = totalLocked.add(lockedAmount);
        }

        return totalLocked;
    }

    function getVestingSchedule(bytes32 vestingScheduleId)
        public
        view
        returns(VestingSchedule memory){
        return vestingSchedules[vestingScheduleId];
    }

    function computeNextVestingScheduleIdForHolder(address holder)
        public
        view
        returns(bytes32){
        return computeVestingScheduleIdForAddressAndIndex(holder, holdersVestingCount[holder]);
    }

    function getLastVestingScheduleForHolder(address holder)
        public
        view
        returns(VestingSchedule memory){
        return vestingSchedules[computeVestingScheduleIdForAddressAndIndex(holder, holdersVestingCount[holder] - 1)];
    }

    function computeVestingScheduleIdForAddressAndIndex(address holder, uint256 index)
        public
        pure
        returns(bytes32){
        return keccak256(abi.encodePacked(holder, index));
    }

    function _computeReleasableAmount(VestingSchedule memory vestingSchedule)
    internal
    view
    returns(uint256){
        uint256 currentTime = getCurrentTime();
        if ((currentTime < vestingSchedule.cliff) || vestingSchedule.revoked == true) {
            return 0;
        } else if (currentTime >= vestingSchedule.start.add(vestingSchedule.duration)) {
            return vestingSchedule.amountTotal.sub(vestingSchedule.released);
        } else {
            uint256 timeFromStart = currentTime.sub(vestingSchedule.start);
            uint secondsPerSlice = vestingSchedule.slicePeriodSeconds;
            uint256 vestedSlicePeriods = timeFromStart.div(secondsPerSlice);
            uint256 vestedSeconds = vestedSlicePeriods.mul(secondsPerSlice);
            uint256 vestedAmount = vestingSchedule.amountTotal.mul(vestedSeconds).div(vestingSchedule.duration);
            vestedAmount = vestedAmount.sub(vestingSchedule.released);
            return vestedAmount;
        }
    }

    function _computeLockedAmount(VestingSchedule memory vestingSchedule)
    internal
    view
    returns(uint256){
        uint256 currentTime = getCurrentTime();
        if (vestingSchedule.revoked == true) {
            return 0;
        } else if ((currentTime < vestingSchedule.cliff)) {
            return vestingSchedule.amountTotal;
        } else if (currentTime >= vestingSchedule.start.add(vestingSchedule.duration)) {
            return 0;
        } else {
            uint256 timeFromStart = currentTime.sub(vestingSchedule.start);
            uint secondsPerSlice = vestingSchedule.slicePeriodSeconds;
            uint256 vestedSlicePeriods = timeFromStart.div(secondsPerSlice);
            uint256 vestedSeconds = vestedSlicePeriods.mul(secondsPerSlice);
            uint256 vestedAmount = vestingSchedule.amountTotal.mul(vestedSeconds).div(vestingSchedule.duration);
            return vestingSchedule.amountTotal.sub(vestedAmount);
        }
    }

    function getCurrentTime()
        internal
        virtual
        view
        returns(uint256){
        return block.timestamp;
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override virtual {
        uint totalLocked = computeLockedAmount(from);
        
        if (from != address(0)) require(amount <= balanceOf(from).sub(totalLocked), 'check vesting or balance');
        super._beforeTokenTransfer(from, to, amount);
    }

    function vestedTransfer(
        address _recipient, 
        uint256 _amount, 
        uint256 _start, 
        uint256 _cliff, 
        uint256 _duration, 
        uint256 _slicePeriodSeconds, 
        bool _revocable
    ) onlyOwner() public virtual {
        createVestingSchedule(_recipient, _start, _cliff, _duration, _slicePeriodSeconds, _revocable, _amount);
        super.transfer(_recipient, _amount);
    }
}