ZEOStaking

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * 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);
    }
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "@openzeppelin/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
interface IERC20 {
    /**
     * @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);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// 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;
    }
}
"
    },
    "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC 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);
}
"
    },
    "@openzeppelin/contracts/utils/Pausable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @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`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    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
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // 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;
    }
}
"
    },
    "contracts/ZEOStaking.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity 0.8.30;\r
\r
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";\r
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";\r
import "@openzeppelin/contracts/utils/Pausable.sol";\r
import "@openzeppelin/contracts/access/Ownable.sol";\r
\r
contract ZEOStaking is ReentrancyGuard, Pausable, Ownable {\r
    using SafeERC20 for IERC20;\r
    \r
    error InvalidAddress();\r
    error InvalidAmount();\r
    error InvalidDuration();\r
    error InvalidTimestamp();\r
    error InvalidTier();\r
    error NoTokenBalance();\r
    error InvalidStakeId();\r
    error ZeoTokenNotSet();\r
    error TokenAlreadySet();\r
    error InvalidAPY(uint256 provided, uint256 max);\r
    error StakingDisabled();\r
    error StakingNotStarted(uint256 currentTime, uint256 startTime);\r
    error StakingPeriodEnded(uint256 currentTime, uint256 endTime);\r
    error StakingDeadlineExceeded(uint256 currentTime, uint256 deadline);\r
    error AlreadyEnabled();\r
    error TierNotActive(StakingTier tier);\r
    error TooManyActiveStakes(uint256 current, uint256 max);\r
    error InsufficientRewardPool(uint256 required, uint256 available);\r
    error MaxRewardPoolExceeded(uint256 reserved, uint256 max);\r
    error AlreadyWithdrawn(uint256 stakeId);\r
    error StillLocked(uint256 currentTime, uint256 unlockTime);\r
    error NoExcessRewards();\r
    error CannotRescueStakingToken(address token);\r
    error FeeOnTransferNotSupported(uint256 expected, uint256 received);\r
    error TGENotSet();\r
    error TGEAlreadySet();\r
    error StakingDeadlineNotReached(uint256 currentTime, uint256 deadline);\r
\r
    uint256 public constant PRECISION = 10000;\r
    uint256 public constant SECONDS_PER_YEAR = 365 days;\r
    uint256 public constant MAX_APY = 10000; // 100%\r
    uint256 public constant MAX_REWARD_POOL = 50000000e18; // 50 Million tokens maximum rewards\r
    uint256 public constant STAKING_DURATION_FROM_TGE = 1095 days; // 3 years from TGE\r
    uint256 public MAX_STAKES_PER_USER;\r
    \r
    IERC20 public zeoToken;\r
    \r
    enum StakingTier { TIER_3M, TIER_6M, TIER_12M, TIER_24M }\r
    \r
    struct TierConfig {\r
        uint256 duration; \r
        uint256 apy;\r
        uint256 totalStaked;\r
        bool active;\r
    }\r
    \r
    struct Stake {\r
        uint256 amount;\r
        uint256 reward;\r
        uint256 startTime;\r
        uint256 endTime;\r
        StakingTier tier;\r
        bool withdrawn;\r
    }\r
    \r
    struct UserInfo {\r
        Stake[] stakes;\r
        uint256 totalStaked;\r
        uint256 totalRewardsClaimed;\r
        uint256 activeStakes;\r
        mapping(StakingTier => uint256) tierStaked;\r
    }\r
    \r
    mapping(StakingTier => TierConfig) public tiers;\r
    mapping(address => UserInfo) private userInfo;\r
    \r
    uint256 public totalValueLocked;\r
    uint256 public totalRewardsDistributed;\r
    uint256 public rewardPool;\r
    uint256 public reservedRewards;\r
    \r
    bool public stakingEnabled;\r
    uint256 public stakingStartTime;\r
    uint256 public stakingEndTime;\r
    uint256 public tgeTimestamp;\r
    uint256 public stakingDeadline;\r
    \r
    event StakingEnabled(uint256 startTime, uint256 endTime);\r
    event ZeoTokenSet(address indexed zeoToken);\r
    event TGESet(uint256 tgeTimestamp, uint256 stakingDeadline);\r
    event RewardPoolWithdrawnAfterDeadline(uint256 amount);\r
    event UpdatedMaxStakeUser(uint256 maxStakes);\r
    \r
    event Staked(\r
        address indexed user,\r
        uint256 indexed stakeId,\r
        uint256 amount,\r
        uint256 reward,\r
        StakingTier tier,\r
        uint256 endTime\r
    );\r
    \r
    event Unstaked(\r
        address indexed user,\r
        uint256 indexed stakeId,\r
        uint256 amount,\r
        uint256 reward\r
    );\r
\r
    event RewardPoolReplenished(uint256 amount);\r
    event TierUpdated(StakingTier tier, bool active);\r
    event TierConfigUpdated(StakingTier tier, uint256 apy);\r
    event ExcessRewardsWithdrawn(uint256 amount);\r
    \r
    modifier whenStakingEnabled() {\r
        if (!stakingEnabled) revert StakingDisabled();\r
        if (block.timestamp < stakingStartTime) {\r
            revert StakingNotStarted(block.timestamp, stakingStartTime);\r
        }\r
        if (block.timestamp >= stakingEndTime) {\r
            revert StakingPeriodEnded(block.timestamp, stakingEndTime);\r
        }\r
        if (tgeTimestamp != 0 && block.timestamp >= stakingDeadline) {\r
            revert StakingDeadlineExceeded(block.timestamp, stakingDeadline);\r
        }\r
        _;\r
    }\r
    \r
    modifier validStakeId(address user, uint256 stakeId) {\r
        if (user == address(0)) revert InvalidAddress();\r
        if (stakeId >= userInfo[user].stakes.length) revert InvalidStakeId();\r
        _;\r
    }\r
    \r
    modifier validTier(StakingTier tier) {\r
        if (uint256(tier) > uint256(StakingTier.TIER_24M)) revert InvalidTier();\r
        _;\r
    }\r
    \r
    modifier validAddress(address addr) {\r
        if (addr == address(0)) revert InvalidAddress();\r
        _;\r
    }\r
\r
    modifier zeoSet() {\r
        if (address(zeoToken) == address(0)) revert ZeoTokenNotSet();\r
        _;\r
    }\r
\r
    constructor() Ownable(msg.sender) {\r
        _initializeTiers();\r
        MAX_STAKES_PER_USER = 20;\r
    }\r
\r
    function _initializeTiers() private {\r
        tiers[StakingTier.TIER_3M] = TierConfig({\r
            duration: 90 days,\r
            apy: 600, // 6%\r
            totalStaked: 0,\r
            active: true\r
        });\r
        \r
        tiers[StakingTier.TIER_6M] = TierConfig({\r
            duration: 180 days,\r
            apy: 900, // 9%\r
            totalStaked: 0,\r
            active: true\r
        });\r
        \r
        tiers[StakingTier.TIER_12M] = TierConfig({\r
            duration: 365 days,\r
            apy: 1200, // 12%\r
            totalStaked: 0,\r
            active: true\r
        });\r
        \r
        tiers[StakingTier.TIER_24M] = TierConfig({\r
            duration: 730 days,\r
            apy: 1800, // 18%\r
            totalStaked: 0,\r
            active: true\r
        });\r
    }\r
\r
    function setTGETime(uint256 _tgeTimestamp) external onlyOwner {\r
        if (_tgeTimestamp <= block.timestamp) revert InvalidTimestamp();\r
        if (tgeTimestamp != 0) revert TGEAlreadySet();\r
        tgeTimestamp = _tgeTimestamp;\r
        stakingDeadline = _tgeTimestamp + STAKING_DURATION_FROM_TGE;\r
        emit TGESet(tgeTimestamp, stakingDeadline);\r
    }\r
\r
    function enableStaking(uint256 duration) external onlyOwner {\r
        if (stakingEnabled) revert AlreadyEnabled();\r
        if (duration == 0) revert InvalidDuration();\r
        \r
        stakingEnabled = true;\r
        stakingStartTime = block.timestamp;\r
        stakingEndTime = block.timestamp + duration;\r
        \r
        emit StakingEnabled(stakingStartTime, stakingEndTime);\r
    }\r
\r
    function setZeoToken(address _zeoToken) external onlyOwner {\r
        if (_zeoToken == address(0)) revert InvalidAddress();\r
        if (address(zeoToken) != address(0)) revert TokenAlreadySet();\r
        zeoToken = IERC20(_zeoToken);\r
        emit ZeoTokenSet(_zeoToken);\r
    }\r
\r
    function setMaxStakeUser(uint256 _usermax) external onlyOwner {\r
        if (_usermax == 0) revert InvalidAmount();\r
        MAX_STAKES_PER_USER = _usermax;\r
        emit UpdatedMaxStakeUser(_usermax);\r
    }\r
    \r
    function updateTierStatus(StakingTier tier, bool active) \r
        external \r
        onlyOwner \r
        validTier(tier) \r
    {\r
        tiers[tier].active = active;\r
        emit TierUpdated(tier, active);\r
    }\r
    \r
    function updateTierConfig(StakingTier tier, uint256 apy) \r
        external \r
        onlyOwner \r
        validTier(tier) \r
    {\r
        if (apy == 0 || apy > MAX_APY) revert InvalidAPY(apy, MAX_APY);\r
        \r
        tiers[tier].apy = apy;\r
        \r
        emit TierConfigUpdated(tier, apy);\r
    }\r
    \r
    function replenishRewardPool(uint256 amount) external onlyOwner nonReentrant {\r
        if (amount == 0) revert InvalidAmount();\r
        zeoToken.safeTransferFrom(msg.sender, address(this), amount);\r
        rewardPool += amount;\r
        emit RewardPoolReplenished(amount);\r
    }\r
\r
    function pause() external onlyOwner { \r
        _pause(); \r
    }\r
    \r
    function unpause() external onlyOwner { \r
        _unpause(); \r
    }\r
    \r
    function stake(uint256 amount, StakingTier tier) \r
        external \r
        nonReentrant \r
        whenNotPaused\r
        zeoSet\r
        whenStakingEnabled\r
        validTier(tier)\r
    {\r
        if (amount == 0) revert InvalidAmount();\r
        \r
        TierConfig storage tierConfig = tiers[tier];\r
        if (!tierConfig.active) revert TierNotActive(tier);\r
        \r
        UserInfo storage user = userInfo[msg.sender];\r
        if (user.activeStakes >= MAX_STAKES_PER_USER) {\r
            revert TooManyActiveStakes(user.activeStakes, MAX_STAKES_PER_USER);\r
        }\r
        \r
        uint256 reward = _calculateFixedReward(amount, tierConfig.apy, tierConfig.duration);\r
\r
        if (reservedRewards + reward > MAX_REWARD_POOL) {\r
            revert MaxRewardPoolExceeded(reservedRewards + reward, MAX_REWARD_POOL);\r
        }\r
        \r
        uint256 availableRewards = rewardPool > reservedRewards ? (rewardPool - reservedRewards) : 0;\r
        if (reward > availableRewards) {\r
            revert InsufficientRewardPool(reward, availableRewards);\r
        }\r
        reservedRewards += reward;\r
        \r
        uint256 balBefore = zeoToken.balanceOf(address(this));\r
        zeoToken.safeTransferFrom(msg.sender, address(this), amount);\r
        uint256 received = zeoToken.balanceOf(address(this)) - balBefore;\r
        if (received != amount) {\r
            reservedRewards -= reward;\r
            revert FeeOnTransferNotSupported(amount, received);\r
        }\r
        \r
        uint256 endTime = block.timestamp + tierConfig.duration;\r
        uint256 stakeId = user.stakes.length;\r
        \r
        user.stakes.push(Stake({\r
            amount: amount,\r
            reward: reward,\r
            startTime: block.timestamp,\r
            endTime: endTime,\r
            tier: tier,\r
            withdrawn: false\r
        }));\r
        \r
        user.totalStaked += amount;\r
        user.activeStakes++;\r
        user.tierStaked[tier] += amount;\r
        tierConfig.totalStaked += amount;\r
        totalValueLocked += amount;\r
        \r
        emit Staked(msg.sender, stakeId, amount, reward, tier, endTime);\r
    }\r
    \r
    function unstake(uint256 stakeId) \r
        external \r
        nonReentrant \r
        whenNotPaused\r
        zeoSet\r
        validStakeId(msg.sender, stakeId)\r
    {\r
        UserInfo storage user = userInfo[msg.sender];\r
        Stake storage userStake = user.stakes[stakeId];\r
        \r
        if (userStake.withdrawn) revert AlreadyWithdrawn(stakeId);\r
        if (block.timestamp < userStake.endTime) {\r
            revert StillLocked(block.timestamp, userStake.endTime);\r
        }\r
        \r
        uint256 amount = userStake.amount;\r
        uint256 reward = userStake.reward;\r
        uint256 totalPayout = amount + reward;\r
        \r
        userStake.withdrawn = true;\r
        user.totalStaked -= amount;\r
        user.totalRewardsClaimed += reward;\r
        user.activeStakes--;\r
        user.tierStaked[userStake.tier] -= amount;\r
        \r
        tiers[userStake.tier].totalStaked -= amount;\r
        \r
        totalValueLocked -= amount;\r
        totalRewardsDistributed += reward;\r
        reservedRewards -= reward;\r
        rewardPool -= reward;\r
        \r
        zeoToken.safeTransfer(msg.sender, totalPayout);\r
        \r
        emit Unstaked(msg.sender, stakeId, amount, reward);\r
    }\r
    \r
    function _calculateFixedReward(\r
        uint256 amount,\r
        uint256 apy,\r
        uint256 duration\r
    ) private pure returns (uint256) {\r
        return (amount * apy * duration) / (PRECISION * SECONDS_PER_YEAR);\r
    }\r
    \r
    function getUserTierStake(address user, StakingTier tier) \r
        public \r
        view \r
        validAddress(user)\r
        returns (uint256) \r
    {\r
        return userInfo[user].tierStaked[tier];\r
    }\r
\r
    function getUserStakes(address user) \r
        external \r
        view \r
        validAddress(user)\r
        returns (Stake[] memory) \r
    {\r
        return userInfo[user].stakes;\r
    }\r
    \r
    function getUserActiveStakes(address user)\r
        external\r
        view\r
        validAddress(user)\r
        returns (Stake[] memory activeStakes, uint256[] memory stakeIds)\r
    {\r
        UserInfo storage info = userInfo[user];\r
        uint256 activeCount = info.activeStakes;\r
        \r
        activeStakes = new Stake[](activeCount);\r
        stakeIds = new uint256[](activeCount);\r
        \r
        uint256 index = 0;\r
        for (uint256 i = 0; i < info.stakes.length && index < activeCount; i++) {\r
            if (!info.stakes[i].withdrawn) {\r
                activeStakes[index] = info.stakes[i];\r
                stakeIds[index] = i;\r
                index++;\r
            }\r
        }\r
        \r
        return (activeStakes, stakeIds);\r
    }\r
\r
    function getUserInfo(address user) \r
        external \r
        view \r
        validAddress(user) \r
        returns (\r
            uint256 totalStaked,\r
            uint256 totalRewardsClaimed,\r
            uint256 activeStakes\r
        ) \r
    {\r
        UserInfo storage info = userInfo[user];\r
        return (\r
            info.totalStaked, \r
            info.totalRewardsClaimed,\r
            info.activeStakes\r
        );\r
    }\r
\r
    function getPendingReward(address user, uint256 stakeId) \r
        external \r
        view \r
        validStakeId(user, stakeId)\r
        returns (uint256) \r
    {\r
        Stake memory s = userInfo[user].stakes[stakeId];\r
        \r
        if (s.withdrawn) return 0;\r
        \r
        if (block.timestamp < s.endTime) {\r
            uint256 stakeDuration = s.endTime - s.startTime;\r
            uint256 timeStaked = block.timestamp - s.startTime;\r
            return (s.reward * timeStaked) / stakeDuration;\r
        }\r
        return s.reward;\r
    }\r
\r
    function getTierInfo(StakingTier tier) \r
        external \r
        view \r
        validTier(tier) \r
        returns (\r
            uint256 duration,\r
            uint256 apy,\r
            uint256 totalStaked,\r
            bool active\r
        ) \r
    {\r
        TierConfig memory config = tiers[tier];\r
        return (\r
            config.duration,\r
            config.apy,\r
            config.totalStaked,\r
            config.active\r
        );\r
    }\r
    \r
    function calculateExpectedReward(uint256 amount, StakingTier tier) \r
        external \r
        view \r
        validTier(tier)\r
        returns (uint256) \r
    {\r
        if (amount == 0) return 0;\r
        TierConfig memory config = tiers[tier];\r
        return _calculateFixedReward(amount, config.apy, config.duration);\r
    }\r
    \r
    function getContractStats() \r
        external \r
        view \r
        returns (\r
            uint256 _totalValueLocked,\r
            uint256 _totalRewardsDistributed,\r
            uint256 _rewardPool,\r
            uint256 _reservedRewards,\r
            uint256 availableRewards\r
        ) \r
    {\r
        availableRewards = rewardPool > reservedRewards ? rewardPool - reservedRewards : 0;\r
        return (\r
            totalValueLocked,\r
            totalRewardsDistributed,\r
            rewardPool,\r
            reservedRewards,\r
            availableRewards\r
        );\r
    }\r
\r
    function getAvailableRewards() external view returns (uint256) {\r
        return rewardPool > reservedRewards ? rewardPool - reservedRewards : 0;\r
    }\r
    \r
    function withdrawExcessRewards() external onlyOwner nonReentrant {\r
        uint256 excess = rewardPool > reservedRewards ? rewardPool - reservedRewards : 0;\r
        if (excess == 0) revert NoExcessRewards();\r
        rewardPool -= excess;\r
        zeoToken.safeTransfer(msg.sender, excess);\r
        emit ExcessRewardsWithdrawn(excess);\r
    }\r
    \r
    function withdrawRemainingRewardsAfterDeadline() external onlyOwner nonReentrant zeoSet {\r
        if (tgeTimestamp == 0) revert TGENotSet();\r
        if (block.timestamp < stakingDeadline) {\r
            revert StakingDeadlineNotReached(block.timestamp, stakingDeadline);\r
        }\r
\r
        uint256 bal = zeoToken.balanceOf(address(this));\r
        if (bal == 0) revert NoTokenBalance();\r
\r
        zeoToken.safeTransfer(msg.sender, bal);\r
        \r
        emit RewardPoolWithdrawnAfterDeadline(bal);\r
    }\r
    \r
    function rescueStuckTokens(address token, uint256 amount) \r
        external \r
        onlyOwner \r
        nonReentrant\r
        validAddress(token)\r
    {\r
        if (token == address(zeoToken)) revert CannotRescueStakingToken(token);\r
        IERC20(token).safeTransfer(msg.sender, amount);\r
    }\r
}\r
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "viaIR": true,
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}