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{
"language": "Solidity",
"sources": {
"contracts/TokenVesting.sol": {
"content": "// contracts/TokenVesting.sol\n// SPDX-License-Identifier: Apache-2.0\npragma solidity 0.8.9;\n\nimport \"@openzeppelin/contracts/token/ERC20/IERC20.sol\";\nimport \"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol\";\nimport \"@openzeppelin/contracts/security/ReentrancyGuard.sol\";\nimport \"@openzeppelin/contracts/access/Ownable.sol\";\nimport \"@openzeppelin/contracts/utils/math/Math.sol\";\nimport \"@openzeppelin/contracts/utils/math/SafeMath.sol\";\n\n/* \n @author: 0xfd3495\n @www: cyclechain.io\n*/\n\ncontract TokenVesting is Ownable, ReentrancyGuard{\n event CreatedVestingSchedule(uint256 indexed index);\n\n using SafeMath for uint256;\n using SafeERC20 for IERC20;\n struct VestingSchedule{\n bool initialized;\n // TGE Unlock\n uint256 tgeUnlock; \n // beneficiary of tokens after they are released\n address beneficiary;\n // cliff period in seconds\n uint256 cliff;\n // start time of the vesting period\n uint256 start;\n // duration of the vesting period in seconds\n uint256 duration;\n // duration of a slice period for the vesting in seconds\n uint256 slicePeriodSeconds;\n // whether or not the vesting is revocable\n bool revocable;\n // total amount of tokens to be released at the end of the vesting\n uint256 amountTotal;\n // amount of tokens released\n uint256 released;\n // whether or not the vesting has been revoked\n bool revoked;\n }\n\n // address of the ERC20 token\n IERC20 immutable private _token;\n\n bytes32[] private vestingSchedulesIds;\n mapping(bytes32 => VestingSchedule) private vestingSchedules;\n uint256 private vestingSchedulesTotalAmount;\n mapping(address => uint256) private holdersVestingCount;\n mapping(bytes32 => uint256) private vestingReleasebleCliff;\n\n event Released(uint256 amount);\n event Revoked();\n\n /**\n * @dev Reverts if no vesting schedule matches the passed identifier.\n */\n modifier onlyIfVestingScheduleExists(bytes32 vestingScheduleId) {\n require(vestingSchedules[vestingScheduleId].initialized == true);\n _;\n }\n\n /**\n * @dev Reverts if the vesting schedule does not exist or has been revoked.\n */\n modifier onlyIfVestingScheduleNotRevoked(bytes32 vestingScheduleId) {\n require(vestingSchedules[vestingScheduleId].initialized == true && vestingSchedules[vestingScheduleId].revoked == false);\n _;\n }\n\n /**\n * @dev Creates a vesting contract.\n * @param token_ address of the ERC20 token contract\n */\n constructor(address token_) {\n require(token_ != address(0x0));\n _token = IERC20(token_);\n }\n\n receive() external payable {}\n\n fallback() external payable {}\n\n /**\n * @dev Returns the number of vesting schedules associated to a beneficiary.\n * @return the number of vesting schedules\n */\n function getVestingSchedulesCountByBeneficiary(address _beneficiary)\n external\n view\n returns(uint256){\n return holdersVestingCount[_beneficiary];\n }\n\n /**\n * @dev Returns the vesting schedule id at the given index.\n * @return the vesting id\n */\n function getVestingIdAtIndex(uint256 index)\n external\n view\n returns(bytes32){\n require(index < getVestingSchedulesCount(), \"TokenVesting: index out of bounds\");\n return vestingSchedulesIds[index];\n }\n\n /**\n * @notice Returns the vesting schedule information for a given holder and index.\n * @return the vesting schedule structure information\n */\n function getVestingScheduleByAddressAndIndex(address holder, uint256 index)\n external\n view\n returns(VestingSchedule memory){\n return getVestingSchedule(computeVestingScheduleIdForAddressAndIndex(holder, index));\n }\n\n\n /**\n * @notice Returns the total amount of vesting schedules.\n * @return the total amount of vesting schedules\n */\n function getVestingSchedulesTotalAmount()\n external\n view\n returns(uint256){\n return vestingSchedulesTotalAmount;\n }\n\n /**\n * @notice Returns the total amount of vesting cliff amount.\n * @return the total amount of vesting cliff amount\n */\n function getVestingSchedulesTotalCliff(bytes32 vestingScheduleId)\n external\n view\n returns(uint256){\n return vestingReleasebleCliff[vestingScheduleId];\n }\n\n /**\n * @dev Returns the address of the ERC20 token managed by the vesting contract.\n */\n function getToken()\n external\n view\n returns(address){\n return address(_token);\n }\n\n /**\n * @notice Creates a new vesting schedule for a beneficiary.\n * @param _beneficiary address of the beneficiary to whom vested tokens are transferred\n * @param _tgeUnlock percent of amount for cliff usable amount \n * @param _start start time of the vesting period\n * @param _cliff duration in seconds of the cliff in which tokens will begin to vest\n * @param _duration duration in seconds of the period in which the tokens will vest\n * @param _slicePeriodSeconds duration of a slice period for the vesting in seconds\n * @param _revocable whether the vesting is revocable or not\n * @param _amount total amount of tokens to be released at the end of the vesting\n */\n function createVestingSchedule(\n address _beneficiary,\n uint256 _tgeUnlock,\n uint256 _start,\n uint256 _cliff,\n uint256 _duration,\n uint256 _slicePeriodSeconds,\n bool _revocable,\n uint256 _amount\n )\n public\n onlyOwner{\n require(\n this.getWithdrawableAmount() >= _amount,\n \"TokenVesting: cannot create vesting schedule because not sufficient tokens\"\n );\n require(_duration > 0, \"TokenVesting: duration must be > 0\");\n require(_amount > 0, \"TokenVesting: amount must be > 0\");\n require(_slicePeriodSeconds >= 1, \"TokenVesting: slicePeriodSeconds must be >= 1\");\n bytes32 vestingScheduleId = this.computeNextVestingScheduleIdForHolder(_beneficiary);\n uint256 cliff = _start.add(_cliff);\n\n uint256 totalCliffAmount = _amount.mul(_tgeUnlock).div(100);\n\n vestingSchedules[vestingScheduleId] = VestingSchedule(\n true,\n _tgeUnlock,\n _beneficiary,\n cliff,\n _start,\n _duration,\n _slicePeriodSeconds,\n _revocable,\n _amount.sub(totalCliffAmount),\n 0,\n false\n );\n\n \n vestingReleasebleCliff[vestingScheduleId] = totalCliffAmount;\n vestingSchedulesTotalAmount = vestingSchedulesTotalAmount.add(_amount.sub(totalCliffAmount));\n vestingSchedulesIds.push(vestingScheduleId);\n uint256 currentVestingCount = holdersVestingCount[_beneficiary];\n holdersVestingCount[_beneficiary] = currentVestingCount.add(1);\n\n emit CreatedVestingSchedule(currentVestingCount);\n }\n\n /**\n * @notice Revokes the vesting schedule for given identifier.\n * @param vestingScheduleId the vesting schedule identifier\n */\n function revoke(bytes32 vestingScheduleId)\n public\n onlyOwner\n onlyIfVestingScheduleNotRevoked(vestingScheduleId){\n VestingSchedule storage vestingSchedule = vestingSchedules[vestingScheduleId];\n require(vestingSchedule.revocable == true, \"TokenVesting: vesting is not revocable\");\n uint256 vestedAmount = _computeReleasableAmount(vestingSchedule);\n if(vestedAmount > 0){\n release(vestingScheduleId, vestedAmount);\n }\n uint256 unreleased = vestingSchedule.amountTotal.sub(vestingSchedule.released);\n vestingSchedulesTotalAmount = vestingSchedulesTotalAmount.sub(unreleased);\n\n uint256 vestedCliffAmount = _computeReleasableCliffAmount(vestingScheduleId);\n if(vestedCliffAmount > 0){\n releaseCliff(vestingScheduleId, vestedCliffAmount);\n }\n vestingReleasebleCliff[vestingScheduleId] = 0;\n\n vestingSchedule.revoked = true;\n }\n\n /**\n * @notice Withdraw the specified amount if possible.\n * @param amount the amount to withdraw\n */\n function withdraw(uint256 amount)\n public\n nonReentrant\n onlyOwner{\n require(this.getWithdrawableAmount() >= amount, \"TokenVesting: not enough withdrawable funds\");\n _token.safeTransfer(owner(), amount);\n }\n\n /**\n * @notice Release vested amount of tokens.\n * @param vestingScheduleId the vesting schedule identifier\n * @param amount the amount to release\n */\n function release(\n bytes32 vestingScheduleId,\n uint256 amount\n )\n public\n nonReentrant\n onlyIfVestingScheduleNotRevoked(vestingScheduleId){\n\n VestingSchedule storage vestingSchedule = vestingSchedules[vestingScheduleId];\n\n require(\n msg.sender == vestingSchedule.beneficiary || msg.sender == owner(),\n \"TokenVesting: only beneficiary and owner can release vested tokens\"\n );\n uint256 vestedAmount = _computeReleasableAmount(vestingSchedule);\n require(vestedAmount >= amount, \"TokenVesting: cannot release tokens, not enough vested tokens\");\n vestingSchedule.released = vestingSchedule.released.add(amount);\n address payable beneficiaryPayable = payable(vestingSchedule.beneficiary);\n vestingSchedulesTotalAmount = vestingSchedulesTotalAmount.sub(amount);\n _token.safeTransfer(beneficiaryPayable, amount);\n }\n\n /**\n * @notice Release vested cliff amount of tokens.\n * @param vestingScheduleId the vesting schedule identifier\n * @param amount the amount to releaseCliff\n */\n function releaseCliff(\n bytes32 vestingScheduleId,\n uint256 amount\n )\n public\n nonReentrant\n onlyIfVestingScheduleNotRevoked(vestingScheduleId){\n\n VestingSchedule storage vestingSchedule = vestingSchedules[vestingScheduleId];\n\n require(\n msg.sender == vestingSchedule.beneficiary || msg.sender == owner(),\n \"TokenVesting: only beneficiary and owner can release vested tokens\"\n );\n uint256 vestedCliffAmount = _computeReleasableCliffAmount(vestingScheduleId);\n require(vestedCliffAmount >= amount, \"TokenVesting: cannot release tokens, not enough cliff vested tokens\");\n \n address payable beneficiaryPayable = payable(vestingSchedule.beneficiary);\n\n vestingReleasebleCliff[vestingScheduleId] = vestingReleasebleCliff[vestingScheduleId].sub(amount);\n _token.safeTransfer(beneficiaryPayable, amount);\n }\n\n /**\n * @dev Returns the number of vesting schedules managed by this contract.\n * @return the number of vesting schedules\n */\n function getVestingSchedulesCount()\n public\n view\n returns(uint256){\n return vestingSchedulesIds.length;\n }\n\n /**\n * @notice Computes the vested amount of tokens for the given vesting schedule identifier.\n * @return the vested amount\n */\n function computeReleasableAmount(bytes32 vestingScheduleId)\n public\n onlyIfVestingScheduleNotRevoked(vestingScheduleId)\n view\n returns(uint256){\n VestingSchedule storage vestingSchedule = vestingSchedules[vestingScheduleId];\n return _computeReleasableAmount(vestingSchedule);\n }\n\n /**\n * @notice Computes the vested cliff amount of tokens for the given vesting schedule identifier.\n * @return the vested cliff amount\n */\n function computeReleasableCliffAmount(bytes32 vestingScheduleId)\n public\n onlyIfVestingScheduleNotRevoked(vestingScheduleId)\n view\n returns(uint256){\n return _computeReleasableCliffAmount(vestingScheduleId);\n }\n\n /**\n * @notice Returns the vesting schedule information for a given identifier.\n * @return the vesting schedule structure information\n */\n function getVestingSchedule(bytes32 vestingScheduleId)\n public\n view\n returns(VestingSchedule memory){\n return vestingSchedules[vestingScheduleId];\n }\n\n /**\n * @dev Returns the amount of tokens that can be withdrawn by the owner.\n * @return the amount of tokens\n */\n function getWithdrawableAmount()\n public\n view\n returns(uint256){\n return _token.balanceOf(address(this)).sub(vestingSchedulesTotalAmount);\n }\n\n /**\n * @dev Computes the next vesting schedule identifier for a given holder address.\n */\n function computeNextVestingScheduleIdForHolder(address holder)\n public\n view\n returns(bytes32){\n return computeVestingScheduleIdForAddressAndIndex(holder, holdersVestingCount[holder]);\n }\n\n /**\n * @dev Returns the last vesting schedule for a given holder address.\n */\n function getLastVestingScheduleForHolder(address holder)\n public\n view\n returns(VestingSchedule memory){\n return vestingSchedules[computeVestingScheduleIdForAddressAndIndex(holder, holdersVestingCount[holder] - 1)];\n }\n\n /**\n * @dev Computes the vesting schedule identifier for an address and an index.\n */\n function computeVestingScheduleIdForAddressAndIndex(address holder, uint256 index)\n public\n pure\n returns(bytes32){\n return keccak256(abi.encodePacked(holder, index));\n }\n\n /**\n * @dev Computes the releasable amount of tokens for a vesting schedule.\n * @return the amount of releasable tokens\n */\n function _computeReleasableAmount(VestingSchedule memory vestingSchedule)\n internal\n view\n returns(uint256){\n uint256 currentTime = getCurrentTime();\n uint256 cliffInSeconds = vestingSchedule.cliff.sub(vestingSchedule.start);\n\n if ((currentTime < vestingSchedule.cliff) || vestingSchedule.revoked == true) {\n return 0;\n } else if (currentTime >= vestingSchedule.start.add(vestingSchedule.duration).add(cliffInSeconds)) {\n return vestingSchedule.amountTotal.sub(vestingSchedule.released); \n } else {\n uint256 timeFromStart = currentTime.sub(vestingSchedule.start);\n uint secondsPerSlice = vestingSchedule.slicePeriodSeconds;\n uint256 vestedSlicePeriods = timeFromStart.div(secondsPerSlice);\n uint256 vestedSeconds = vestedSlicePeriods.mul(secondsPerSlice);\n\n uint256 vestedAmount = 0;\n uint256 customPerSlice = vestedSeconds;\n \n if (vestedSeconds == cliffInSeconds){ // after cliff seconds first\n customPerSlice = secondsPerSlice;\n } else if (vestedSeconds > cliffInSeconds) {\n customPerSlice = vestedSeconds.sub(cliffInSeconds).add(secondsPerSlice);\n }\n\n // set max limit as duration\n if(customPerSlice >= vestingSchedule.duration) {\n customPerSlice = vestingSchedule.duration;\n }\n\n vestedAmount = vestingSchedule.amountTotal.mul(customPerSlice).div(vestingSchedule.duration);\n vestedAmount = vestedAmount.sub(vestingSchedule.released);\n\n return vestedAmount;\n }\n }\n\n /**\n * @dev Computes the releasable amount of tokens for a vesting schedule.\n * @return the amount of releasable tokens\n */\n function _computeReleasableCliffAmount(bytes32 vestingScheduleId)\n internal\n view\n returns(uint256){\n return vestingReleasebleCliff[vestingScheduleId];\n }\n\n function getCurrentTime()\n internal\n virtual\n view\n returns(uint256){\n return block.timestamp;\n }\n\n}"
},
"@openzeppelin/contracts/token/ERC20/IERC20.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `to`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address to, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `from` to `to` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address from,\n address to,\n uint256 amount\n ) external returns (bool);\n}\n"
},
"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../IERC20.sol\";\nimport \"../../../utils/Address.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n using Address for address;\n\n function safeTransfer(\n IERC20 token,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n /**\n * @dev Deprecated. This function has issues similar to the ones found in\n * {IERC20-approve}, and its usage is discouraged.\n *\n * Whenever possible, use {safeIncreaseAllowance} and\n * {safeDecreaseAllowance} instead.\n */\n function safeApprove(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n // safeApprove should only be called when setting an initial allowance,\n // or when resetting it to zero. To increase and decrease it, use\n // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\n require(\n (value == 0) || (token.allowance(address(this), spender) == 0),\n \"SafeERC20: approve from non-zero to non-zero allowance\"\n );\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));\n }\n\n function safeIncreaseAllowance(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n uint256 newAllowance = token.allowance(address(this), spender) + value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n\n function safeDecreaseAllowance(\n IERC20 token,\n address spender,\n uint256 value\n ) internal {\n unchecked {\n uint256 oldAllowance = token.allowance(address(this), spender);\n require(oldAllowance >= value, \"SafeERC20: decreased allowance below zero\");\n uint256 newAllowance = oldAllowance - value;\n _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));\n }\n }\n\n /**\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n * on the return value: the return value is optional (but if data is returned, it must not be false).\n * @param token The token targeted by the call.\n * @param data The call data (encoded using abi.encode or one of its variants).\n */\n function _callOptionalReturn(IERC20 token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\n // the target address contains contract code and also asserts for success in the low-level call.\n\n bytes memory returndata = address(token).functionCall(data, \"SafeERC20: low-level call failed\");\n if (returndata.length > 0) {\n // Return data is optional\n require(abi.decode(returndata, (bool)), \"SafeERC20: ERC20 operation did not succeed\");\n }\n }\n}\n"
},
"@openzeppelin/contracts/security/ReentrancyGuard.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant _NOT_ENTERED = 1;\n uint256 private constant _ENTERED = 2;\n\n uint256 private _status;\n\n constructor() {\n _status = _NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and making it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n // On the first call to nonReentrant, _notEntered will be true\n require(_status != _ENTERED, \"ReentrancyGuard: reentrant call\");\n\n // Any calls to nonReentrant after this point will fail\n _status = _ENTERED;\n\n _;\n\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = _NOT_ENTERED;\n }\n}\n"
},
"@openzeppelin/contracts/access/Ownable.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)\n\npragma solidity ^0.8.0;\n\nimport \"../utils/Context.sol\";\n\n/**\n * @dev Contract module which provides a basic access control mechanism, where\n * there is an account (an owner) that can be granted exclusive access to\n * specific functions.\n *\n * By default, the owner account will be the one that deploys the contract. This\n * can later be changed with {transferOwnership}.\n *\n * This module is used through inheritance. It will make available the modifier\n * `onlyOwner`, which can be applied to your functions to restrict their use to\n * the owner.\n */\nabstract contract Ownable is Context {\n address private _owner;\n\n event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n\n /**\n * @dev Initializes the contract setting the deployer as the initial owner.\n */\n constructor() {\n _transferOwnership(_msgSender());\n }\n\n /**\n * @dev Returns the address of the current owner.\n */\n function owner() public view virtual returns (address) {\n return _owner;\n }\n\n /**\n * @dev Throws if called by any account other than the owner.\n */\n modifier onlyOwner() {\n require(owner() == _msgSender(), \"Ownable: caller is not the owner\");\n _;\n }\n\n /**\n * @dev Leaves the contract without owner. It will not be possible to call\n * `onlyOwner` functions anymore. Can only be called by the current owner.\n *\n * NOTE: Renouncing ownership will leave the contract without an owner,\n * thereby removing any functionality that is only available to the owner.\n */\n function renounceOwnership() public virtual onlyOwner {\n _transferOwnership(address(0));\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Can only be called by the current owner.\n */\n function transferOwnership(address newOwner) public virtual onlyOwner {\n require(newOwner != address(0), \"Ownable: new owner is the zero address\");\n _transferOwnership(newOwner);\n }\n\n /**\n * @dev Transfers ownership of the contract to a new account (`newOwner`).\n * Internal function without access restriction.\n */\n function _transferOwnership(address newOwner) internal virtual {\n address oldOwner = _owner;\n _owner = newOwner;\n emit OwnershipTransferred(oldOwner, newOwner);\n }\n}\n"
},
"@openzeppelin/contracts/utils/math/Math.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/math/Math.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Standard math utilities missing in the Solidity language.\n */\nlibrary Math {\n /**\n * @dev Returns the largest of two numbers.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a >= b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n /**\n * @dev Returns the average of two numbers. The result is rounded towards\n * zero.\n */\n function average(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b) / 2 can overflow.\n return (a & b) + (a ^ b) / 2;\n }\n\n /**\n * @dev Returns the ceiling of the division of two numbers.\n *\n * This differs from standard division with `/` in that it rounds up instead\n * of rounding down.\n */\n function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {\n // (a + b - 1) / b can overflow on addition, so we distribute.\n return a / b + (a % b == 0 ? 0 : 1);\n }\n}\n"
},
"@openzeppelin/contracts/utils/math/SafeMath.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)\n\npragma solidity ^0.8.0;\n\n// CAUTION\n// This version of SafeMath should only be used with Solidity 0.8 or later,\n// because it relies on the compiler's built in overflow checks.\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations.\n *\n * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler\n * now has built in overflow checking.\n */\nlibrary SafeMath {\n /**\n * @dev Returns the addition of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n uint256 c = a + b;\n if (c < a) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b > a) return (false, 0);\n return (true, a - b);\n }\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\n *\n * _Available since v3.4._\n */\n function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\n // benefit is lost if 'b' is also tested.\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\n if (a == 0) return (true, 0);\n uint256 c = a * b;\n if (c / a != b) return (false, 0);\n return (true, c);\n }\n }\n\n /**\n * @dev Returns the division of two unsigned integers, with a division by zero flag.\n *\n * _Available since v3.4._\n */\n function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a / b);\n }\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\n *\n * _Available since v3.4._\n */\n function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {\n unchecked {\n if (b == 0) return (false, 0);\n return (true, a % b);\n }\n }\n\n /**\n * @dev Returns the addition of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `+` operator.\n *\n * Requirements:\n *\n * - Addition cannot overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n return a + b;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n return a - b;\n }\n\n /**\n * @dev Returns the multiplication of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `*` operator.\n *\n * Requirements:\n *\n * - Multiplication cannot overflow.\n */\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n return a * b;\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers, reverting on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator.\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\n return a / b;\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * reverting when dividing by zero.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\n return a % b;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n * overflow (when the result is negative).\n *\n * CAUTION: This function is deprecated because it requires allocating memory for the error\n * message unnecessarily. For custom revert reasons use {trySub}.\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n unchecked {\n require(b <= a, errorMessage);\n return a - b;\n }\n }\n\n /**\n * @dev Returns the integer division of two unsigned integers, reverting with custom message on\n * division by zero. The result is rounded towards zero.\n *\n * Counterpart to Solidity's `/` operator. Note: this function uses a\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\n * uses an invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function div(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n unchecked {\n require(b > 0, errorMessage);\n return a / b;\n }\n }\n\n /**\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\n * reverting with custom message when dividing by zero.\n *\n * CAUTION: This function is deprecated because it requires allocating memory for the error\n * message unnecessarily. For custom revert reasons use {tryMod}.\n *\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\n * opcode (which leaves remaining gas untouched) while Solidity uses an\n * invalid opcode to revert (consuming all remaining gas).\n *\n * Requirements:\n *\n * - The divisor cannot be zero.\n */\n function mod(\n uint256 a,\n uint256 b,\n string memory errorMessage\n ) internal pure returns (uint256) {\n unchecked {\n require(b > 0, errorMessage);\n return a % b;\n }\n }\n}\n"
},
"@openzeppelin/contracts/utils/Address.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)\n\npragma solidity ^0.8.1;\n\n/**\n * @dev Collection of functions related to the address type\n */\nlibrary Address {\n /**\n * @dev Returns true if `account` is a contract.\n *\n * [IMPORTANT]\n * ====\n * It is unsafe to assume that an address for which this function returns\n * false is an externally-owned account (EOA) and not a contract.\n *\n * Among others, `isContract` will return false for the following\n * types of addresses:\n *\n * - an externally-owned account\n * - a contract in construction\n * - an address where a contract will be created\n * - an address where a contract lived, but was destroyed\n * ====\n *\n * [IMPORTANT]\n * ====\n * You shouldn't rely on `isContract` to protect against flash loan attacks!\n *\n * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets\n * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract\n * constructor.\n * ====\n */\n function isContract(address account) internal view returns (bool) {\n // This method relies on extcodesize/address.code.length, which returns 0\n // for contracts in construction, since the code is only stored at the end\n // of the constructor execution.\n\n return account.code.length > 0;\n }\n\n /**\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\n * `recipient`, forwarding all available gas and reverting on errors.\n *\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\n * imposed by `transfer`, making them unable to receive funds via\n * `transfer`. {sendValue} removes this limitation.\n *\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\n *\n * IMPORTANT: because control is transferred to `recipient`, care must be\n * taken to not create reentrancy vulnerabilities. Consider using\n * {ReentrancyGuard} or the\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\n */\n function sendValue(address payable recipient, uint256 amount) internal {\n require(address(this).balance >= amount, \"Address: insufficient balance\");\n\n (bool success, ) = recipient.call{value: amount}(\"\");\n require(success, \"Address: unable to send value, recipient may have reverted\");\n }\n\n /**\n * @dev Performs a Solidity function call using a low level `call`. A\n * plain `call` is an unsafe replacement for a function call: use this\n * function instead.\n *\n * If `target` reverts with a revert reason, it is bubbled up by this\n * function (like regular Solidity function calls).\n *\n * Returns the raw returned data. To convert to the expected return value,\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\n *\n * Requirements:\n *\n * - `target` must be a contract.\n * - calling `target` with `data` must not revert.\n *\n * _Available since v3.1._\n */\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionCall(target, data, \"Address: low-level call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\n * `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n return functionCallWithValue(target, data, 0, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but also transferring `value` wei to `target`.\n *\n * Requirements:\n *\n * - the calling contract must have an ETH balance of at least `value`.\n * - the called Solidity function must be `payable`.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value\n ) internal returns (bytes memory) {\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\n * with `errorMessage` as a fallback revert reason when `target` reverts.\n *\n * _Available since v3.1._\n */\n function functionCallWithValue(\n address target,\n bytes memory data,\n uint256 value,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\n require(isContract(target), \"Address: call to non-contract\");\n\n (bool success, bytes memory returndata) = target.call{value: value}(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {\n return functionStaticCall(target, data, \"Address: low-level static call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a static call.\n *\n * _Available since v3.3._\n */\n function functionStaticCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal view returns (bytes memory) {\n require(isContract(target), \"Address: static call to non-contract\");\n\n (bool success, bytes memory returndata) = target.staticcall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {\n return functionDelegateCall(target, data, \"Address: low-level delegate call failed\");\n }\n\n /**\n * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\n * but performing a delegate call.\n *\n * _Available since v3.4._\n */\n function functionDelegateCall(\n address target,\n bytes memory data,\n string memory errorMessage\n ) internal returns (bytes memory) {\n require(isContract(target), \"Address: delegate call to non-contract\");\n\n (bool success, bytes memory returndata) = target.delegatecall(data);\n return verifyCallResult(success, returndata, errorMessage);\n }\n\n /**\n * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the\n * revert reason using the provided one.\n *\n * _Available since v4.3._\n */\n function verifyCallResult(\n bool success,\n bytes memory returndata,\n string memory errorMessage\n ) internal pure returns (bytes memory) {\n if (success) {\n return returndata;\n } else {\n // Look for revert reason and bubble it up if present\n if (returndata.length > 0) {\n // The easiest way to bubble the revert reason is using memory via assembly\n\n assembly {\n let returndata_size := mload(returndata)\n revert(add(32, returndata), returndata_size)\n }\n } else {\n revert(errorMessage);\n }\n }\n }\n}\n"
},
"@openzeppelin/contracts/utils/Context.sol": {
"content": "// SPDX-License-Identifier: MIT\n// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)\n\npragma solidity ^0.8.0;\n\n/**\n * @dev Provides information about the current execution context, including the\n * sender of the transaction and its data. While these are generally available\n * via msg.sender and msg.data, they should not be accessed in such a direct\n * manner, since when dealing with meta-transactions the account sending and\n * paying for execution may not be the actual sender (as far as an application\n * is concerned).\n *\n * This contract is only required for intermediate, library-like contracts.\n */\nabstract contract Context {\n function _msgSender() internal view virtual returns (address) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes calldata) {\n return msg.data;\n }\n}\n"
}
},
"settings": {
"optimizer": {
"enabled": false,
"runs": 200
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}
} |