Contract Address Details

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol


// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, aand then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// File: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;


/**
 * @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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/math/SafeMath.sol


// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
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) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            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) {
        unchecked {
            // 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) {
        unchecked {
            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) {
        unchecked {
            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) {
        return a + b;
    }

    /**
     * @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) {
        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) {
        return a * b;
    }

    /**
     * @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.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        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) {
        unchecked {
            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.
     *
     * 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) {
        unchecked {
            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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// File: fundingcontract.sol


pragma solidity ^0.8.22;




contract GrantContract is ReentrancyGuard, Ownable {
    using SafeMath for uint256;

    struct Beneficiary {
        uint256 totalAllotment;
        uint256 unlockedAmount;
        uint256 lastClaimBlock;
        uint256 unlockInterval; // in blocks
        string label;
        bool isPaused; // Pause funding for this beneficiary
    }

    uint256 public blockTime = 5; // 5 seconds per block
    mapping(address => Beneficiary) public beneficiaries;
    address[] public beneficiaryList;
    uint256 public contractBalance;

    event FundsAdded(uint256 amount);
    event FundsWithdrawn(uint256 amount);
    event BeneficiaryAdded(address indexed beneficiary, uint256 amount, uint256 unlockInterval, string label);
    event BeneficiaryRemoved(address indexed beneficiary);
    event FundsClaimed(address indexed beneficiary, uint256 amount);
    event BeneficiaryPaused(address indexed beneficiary);
    event BeneficiaryUnpaused(address indexed beneficiary);

    constructor(address initialOwner) Ownable(initialOwner) {}

    // Add funds to the contract
    function addFunds() external payable onlyOwner {
        require(msg.value > 0, "No funds added");
        contractBalance = contractBalance.add(msg.value);
        emit FundsAdded(msg.value);
    }

    // Add or update a beneficiary's allotment
    function allotFunds(
        address _beneficiary,
        uint256 _amount,
        string memory _unlockInterval,
        string memory _label
    ) external onlyOwner {
        require(_beneficiary != address(0), "Invalid address");
        require(_amount > 0, "Amount must be greater than zero");

        uint256 unlockIntervalBlocks = calculateUnlockInterval(_unlockInterval);

        Beneficiary storage beneficiary = beneficiaries[_beneficiary];
        if (beneficiary.totalAllotment == 0) {
            beneficiaryList.push(_beneficiary);
        }

        beneficiary.totalAllotment = _amount;
        beneficiary.unlockedAmount = 0;
        beneficiary.lastClaimBlock = block.number;
        beneficiary.unlockInterval = unlockIntervalBlocks;
        beneficiary.label = _label;
        beneficiary.isPaused = false;

        emit BeneficiaryAdded(_beneficiary, _amount, unlockIntervalBlocks, _label);
    }

    // Remove a beneficiary's allotment
    function removeBeneficiary(address _beneficiary) external onlyOwner {
        require(beneficiaries[_beneficiary].totalAllotment > 0, "No allotment found");
        delete beneficiaries[_beneficiary];
        emit BeneficiaryRemoved(_beneficiary);
    }

    // Pause funding for a specific beneficiary
    function pauseBeneficiary(address _beneficiary) external onlyOwner {
        require(beneficiaries[_beneficiary].totalAllotment > 0, "No allotment found");
        beneficiaries[_beneficiary].isPaused = true;
        emit BeneficiaryPaused(_beneficiary);
    }

    // Unpause funding for a specific beneficiary
    function unpauseBeneficiary(address _beneficiary) external onlyOwner {
        require(beneficiaries[_beneficiary].totalAllotment > 0, "No allotment found");
        beneficiaries[_beneficiary].isPaused = false;
        emit BeneficiaryUnpaused(_beneficiary);
    }

    // Claim funds
    function claim() external nonReentrant {
        Beneficiary storage beneficiary = beneficiaries[msg.sender];
        require(beneficiary.totalAllotment > 0, "No allotment found");
        require(!beneficiary.isPaused, "Funding for this beneficiary is paused");

        uint256 blocksSinceLastClaim = block.number.sub(beneficiary.lastClaimBlock);
        require(blocksSinceLastClaim >= beneficiary.unlockInterval, "Claim period not reached");

        uint256 claimableIntervals = blocksSinceLastClaim.div(beneficiary.unlockInterval);
        uint256 claimableAmount = beneficiary.totalAllotment
            .div(365 * 24 * 60 * 60 / blockTime / beneficiary.unlockInterval)
            .mul(claimableIntervals);

        if (claimableAmount.add(beneficiary.unlockedAmount) > beneficiary.totalAllotment) {
            claimableAmount = beneficiary.totalAllotment.sub(beneficiary.unlockedAmount);
        }

        require(claimableAmount > 0, "No funds to claim");
        require(claimableAmount <= address(this).balance, "Insufficient contract balance");

        beneficiary.unlockedAmount = beneficiary.unlockedAmount.add(claimableAmount);
        beneficiary.lastClaimBlock = beneficiary.lastClaimBlock.add(claimableIntervals.mul(beneficiary.unlockInterval));

        payable(msg.sender).transfer(claimableAmount);

        emit FundsClaimed(msg.sender, claimableAmount);
    }

    // Withdraw excess funds from the contract
    function withdrawFunds(uint256 _amount) external onlyOwner {
        require(_amount <= address(this).balance, "Insufficient balance");
        contractBalance = contractBalance.sub(_amount);
        payable(owner()).transfer(_amount);
        emit FundsWithdrawn(_amount);
    }

    // View all beneficiaries
    function getAllBeneficiaries() external view returns (address[] memory) {
        return beneficiaryList;
    }

    // View details of a specific beneficiary
    function getBeneficiaryDetails(address _beneficiary) external view returns (Beneficiary memory) {
        return beneficiaries[_beneficiary];
    }

    // Helper function to calculate unlock interval in blocks
    function calculateUnlockInterval(string memory _unlockInterval) internal view returns (uint256) {
        if (keccak256(bytes(_unlockInterval)) == keccak256(bytes("monthly"))) {
            return (30 * 24 * 60 * 60) / blockTime;
        } else if (keccak256(bytes(_unlockInterval)) == keccak256(bytes("quarterly"))) {
            return (90 * 24 * 60 * 60) / blockTime;
        } else if (keccak256(bytes(_unlockInterval)) == keccak256(bytes("half-yearly"))) {
            return (180 * 24 * 60 * 60) / blockTime;
        } else if (keccak256(bytes(_unlockInterval)) == keccak256(bytes("yearly"))) {
            return (365 * 24 * 60 * 60) / blockTime;
        } else {
            revert("Invalid unlock interval");
        }
    }
}