{{ "language": "Solidity", "sources": { "contracts/ATA_ETH.sol": { "content": "// SPDX-License-Identifier: Apache-2.0\npragma solidity ^0.6.0;\n\nimport '@openzeppelin/contracts/token/ERC20/ERC20.sol';\nimport '@openzeppelin/contracts/access/Ownable.sol';\nimport '@openzeppelin/contracts/math/SafeMath.sol';\n\ncontract ATAToken is ERC20, Ownable {\n using SafeMath for uint256;\n\n enum VestingCategory {\n EARLY_CONTRIBUTORS,\n NETWORK_FEES,\n PROTOCOL_RESERVE,\n PARTNER_ADVISORS,\n TEAM,\n ECOSYSTEM_COMMUNITY\n }\n\n enum VestingType {TIME, BLOCK}\n\n uint256 private constant TOTAL_QUOTA = 100;\n\n uint256 private EARLY_CONTRIBUTORS_QUOTA = 15;\n uint256 private NETWORK_FEES_QUOTA = 0;\n uint256 private PROTOCOL_RESERVE_QUOTA = 35;\n uint256 private PARTNER_ADVISORS_QUOTA = 5;\n uint256 private TEAM_QUOTA = 15;\n uint256 private ECOSYSTEM_COMMUNITY_QUOTA = 30;\n\n event VestingPlanAdded(uint256 uniqueId);\n event VestingPlanRevoked(uint256 uniqueId);\n event QuotaAdjusted(\n uint256 earlyContributors,\n uint256 networkFees,\n uint256 protocolReserve,\n uint256 parternerAndAdvisor,\n uint256 team,\n uint256 ecosystemAndCommunity\n );\n event Withdraw(address beneficiary, uint256 amount);\n\n struct VestingPlan {\n uint256 uniqueId; //each vesting plan has a unique id\n bool isRevocable; //true if the vesting plan is revocable\n bool isRevoked; //true if the vesting plan is revoked\n bool accumulateDuringCliff; //true if the token amount is accumulated during cliff\n uint256 startTime; //grant start date, in seconds(VestingType.TIME) or block nums(VestingType.BLOCK)\n uint256 cliffDuration; //duration of cliff, in seconds(VestingType.TIME) or block nums(VestingType.BLOCK)\n uint256 duration; //duration of vesting plan, in seconds(VestingType.TIME) or block nums(VestingType.BLOCK), exclude cliff\n uint256 interval; //release interval, in seconds, useless if vestingType is VestingType.BLOCK\n uint256 initialAmount; //amount of tokens which will be released at startTime\n uint256 totalAmount; //total amount of vesting plan\n address beneficiary; //address that benefit from the vesting plan\n VestingCategory category; //vesting plan category -e.g. for backers, for team members...\n VestingType vestingType; //vesting type, vestingType==VestingType.BLOCK indicates that use block num as timing unit\n }\n\n mapping(uint256 => VestingPlan) private _vestingPlans;\n mapping(address => uint256[]) private _vestingPlanIds;\n mapping(uint256 => uint256) private _released;\n mapping(uint32 => uint256) private _categoryVestedAmount;\n\n constructor(uint256 initialSupply) public ERC20('Automata', 'ATA') {\n _mint(msg.sender, initialSupply);\n }\n\n function addVestingPlan(\n address beneficiary,\n uint256 totalAmount,\n uint256 initialAmount,\n uint256 startTime,\n uint256 cliffDuration,\n uint256 duration,\n uint256 interval,\n bool accumulateDuringCliff,\n bool isRevocable,\n VestingCategory category,\n VestingType vestingType\n ) public onlyOwner {\n uint256 currentTime = (vestingType == VestingType.TIME ? now : block.number);\n //check the startTime\n require(startTime > currentTime, 'The start time can not be earlier than the current time');\n require(initialAmount <= totalAmount, 'Initial amount can not be greater than the total amount');\n //check whether owner's balance is enough\n require(balanceOf(owner()) >= totalAmount, \"Exceed owner's balance\");\n //check whether category's balance is enough\n require(\n (_categoryVestedAmount[uint32(category)] + totalAmount) <=\n totalSupply().mul(_getCategoryPercentage(category)).div(TOTAL_QUOTA),\n \"Exceed category's balance\"\n );\n\n //generate unique id for vesting plan\n uint256 uniqueId = _getUniqueId(beneficiary);\n _vestingPlanIds[beneficiary].push(uniqueId);\n _vestingPlans[uniqueId] = VestingPlan(\n uniqueId,\n isRevocable,\n false,\n accumulateDuringCliff,\n startTime,\n cliffDuration,\n duration,\n interval,\n initialAmount,\n totalAmount,\n beneficiary,\n category,\n vestingType\n );\n _categoryVestedAmount[uint32(category)] = _categoryVestedAmount[uint32(category)] + totalAmount;\n //deposit funds in address(this)\n transfer(address(this), totalAmount);\n emit VestingPlanAdded(uniqueId);\n }\n\n /**\n revoke all vesting plan of `beneficiary`\n */\n function revokeVestingPlan(uint256 uniqueId) public onlyOwner {\n VestingPlan storage plan = _vestingPlans[uniqueId];\n require(plan.uniqueId == uniqueId, 'Vesting plan not exist');\n\n require(plan.isRevoked == false, \"Vesting plan is already revoked\");\n require(plan.isRevocable, 'Vesting plan is not revocable');\n\n plan.isRevoked = true;\n\n uint256 unreleasedAmount = _getUnreleasedAmount(uniqueId);\n //refund the unreleased tokens to owner\n this.transfer(owner(), unreleasedAmount);\n emit VestingPlanRevoked(uniqueId);\n }\n\n function getVestingPlan(uint256 planUniqueId)\n public\n view\n onlyOwner\n returns (\n bool isRevocable,\n bool isRevoked,\n bool accumulateDuringCliff,\n uint256 startTime,\n uint256 cliffDuration,\n uint256 duration,\n uint256 interval,\n uint256 initialAmount,\n uint256 totalAmount,\n address beneficiary,\n VestingCategory category,\n VestingType vestingType\n )\n // VestingType vestingType\n {\n VestingPlan memory vestingPlan = _vestingPlans[planUniqueId];\n return (\n vestingPlan.isRevocable,\n vestingPlan.isRevoked,\n vestingPlan.accumulateDuringCliff,\n vestingPlan.startTime,\n vestingPlan.cliffDuration,\n vestingPlan.duration,\n vestingPlan.interval,\n vestingPlan.initialAmount,\n vestingPlan.totalAmount,\n vestingPlan.beneficiary,\n vestingPlan.category,\n vestingPlan.vestingType\n );\n }\n\n function adjustQuota(\n uint256 earlyContributors,\n uint256 networkFees,\n uint256 protocolReserve,\n uint256 parternerAndAdvisor,\n uint256 team,\n uint256 ecosystemAndCommunity\n ) public onlyOwner {\n require(\n earlyContributors + networkFees + protocolReserve + parternerAndAdvisor + team + ecosystemAndCommunity ==\n 100,\n 'Invalid quota'\n );\n\n uint256 totalSupply = totalSupply();\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.EARLY_CONTRIBUTORS)] <=\n totalSupply.mul(earlyContributors).div(TOTAL_QUOTA),\n 'Exceed allocated quota, EARLY_CONTRIBUTORS'\n );\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.NETWORK_FEES)] <=\n totalSupply.mul(networkFees).div(TOTAL_QUOTA),\n 'Exceed allocated quota, NETWORK_FEES'\n );\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.PROTOCOL_RESERVE)] <=\n totalSupply.mul(protocolReserve).div(TOTAL_QUOTA),\n 'Exceed allocated quota, PROTOCOL_RESERVE'\n );\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.PARTNER_ADVISORS)] <=\n totalSupply.mul(parternerAndAdvisor).div(TOTAL_QUOTA),\n 'Exceed allocated quota, PARTNER_ADVISORS'\n );\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.TEAM)] <= totalSupply.mul(team).div(TOTAL_QUOTA),\n 'Exceed allocated quota, TEAM'\n );\n\n require(\n _categoryVestedAmount[uint32(VestingCategory.ECOSYSTEM_COMMUNITY)] <=\n totalSupply.mul(ecosystemAndCommunity).div(TOTAL_QUOTA),\n 'Exceed allocated quota, ECOSYSTEM_COMMUNITY'\n );\n\n EARLY_CONTRIBUTORS_QUOTA = earlyContributors;\n NETWORK_FEES_QUOTA = networkFees;\n PROTOCOL_RESERVE_QUOTA = protocolReserve;\n PARTNER_ADVISORS_QUOTA = parternerAndAdvisor;\n TEAM_QUOTA = team;\n ECOSYSTEM_COMMUNITY_QUOTA = ecosystemAndCommunity;\n\n emit QuotaAdjusted(\n earlyContributors,\n networkFees,\n protocolReserve,\n parternerAndAdvisor,\n team,\n ecosystemAndCommunity\n );\n }\n\n /**\n withdraw releaseable tokens\n */\n function withdraw() public {\n uint256[] memory vestingPlanIds = _vestingPlanIds[msg.sender];\n require(vestingPlanIds.length != 0, 'No vesting plans exist');\n\n uint256 totalWithdrawableAmount = 0;\n for (uint32 i = 0; i < vestingPlanIds.length; i++) {\n uint256 vestingPlanId = vestingPlanIds[i];\n uint256 planWithdrawableAmount = _calculateWithdrawableAmount(_vestingPlans[vestingPlanId]);\n _released[vestingPlanId] = _released[vestingPlanId] + planWithdrawableAmount;\n totalWithdrawableAmount += planWithdrawableAmount;\n }\n\n //transfer withdrawable tokens to beneficiary\n this.transfer(msg.sender, totalWithdrawableAmount);\n emit Withdraw(msg.sender, totalWithdrawableAmount);\n }\n\n function getTotalVestedAmount() public view returns (uint256) {\n uint256[] memory vestingPlanIds = _vestingPlanIds[msg.sender];\n require(vestingPlanIds.length != 0, 'No vesting plans exist');\n\n uint256 totalVestedAmount = 0;\n for (uint32 i = 0; i < vestingPlanIds.length; i++) {\n VestingPlan memory vestingPlan = _vestingPlans[vestingPlanIds[i]];\n if (!vestingPlan.isRevoked) {\n totalVestedAmount += vestingPlan.totalAmount;\n }\n }\n\n return totalVestedAmount;\n }\n\n function getWithdrawableAmount() public view returns (uint256) {\n uint256[] memory vestingPlanIds = _vestingPlanIds[msg.sender];\n require(vestingPlanIds.length != 0, 'No vesting plans exist');\n\n uint256 totalWithdrawableAmount = 0;\n for (uint32 i = 0; i < vestingPlanIds.length; i++) {\n uint256 planWithdrawableAmount = _calculateWithdrawableAmount(_vestingPlans[vestingPlanIds[i]]);\n totalWithdrawableAmount += planWithdrawableAmount;\n }\n\n return totalWithdrawableAmount;\n }\n\n function _getCategoryPercentage(VestingCategory category) private view returns (uint256) {\n if (category == VestingCategory.EARLY_CONTRIBUTORS) {\n return EARLY_CONTRIBUTORS_QUOTA;\n } else if (category == VestingCategory.NETWORK_FEES) {\n return NETWORK_FEES_QUOTA;\n } else if (category == VestingCategory.PROTOCOL_RESERVE) {\n return PROTOCOL_RESERVE_QUOTA;\n } else if (category == VestingCategory.PARTNER_ADVISORS) {\n return PARTNER_ADVISORS_QUOTA;\n } else if (category == VestingCategory.TEAM) {\n return TEAM_QUOTA;\n } else if (category == VestingCategory.ECOSYSTEM_COMMUNITY) {\n return ECOSYSTEM_COMMUNITY_QUOTA;\n } else {\n revert('Invalid vesting category');\n }\n }\n\n function _getUniqueId(address beneficiary) private view returns (uint256) {\n uint256 uniqueId =\n uint256(\n keccak256(\n abi.encodePacked(string(abi.encodePacked(beneficiary)), block.number, now)\n )\n );\n return uniqueId;\n }\n\n function _getUnreleasedAmount(uint256 uniqueId) private view returns (uint256) {\n VestingPlan memory plan = _vestingPlans[uniqueId];\n uint256 unreleasedAmount = plan.totalAmount - _released[uniqueId];\n return unreleasedAmount;\n }\n\n function _calculateWithdrawableAmount(VestingPlan memory plan) private view returns (uint256) {\n //revoked vesting plan\n if (plan.isRevoked) {\n return uint256(0);\n }\n\n uint256 currentTime = (plan.vestingType == VestingType.TIME ? now : block.number);\n\n if (currentTime < plan.startTime) {\n return uint256(0);\n }\n\n //during cliff\n uint256 releasedAmount = _released[plan.uniqueId];\n if (currentTime <= plan.startTime.add(plan.cliffDuration)) {\n if (plan.initialAmount > releasedAmount) {\n return plan.initialAmount.sub(releasedAmount);\n } else {\n return uint256(0);\n }\n //vesting finished\n } else if (currentTime > plan.startTime.add(plan.cliffDuration).add(plan.duration)) {\n if (plan.totalAmount > releasedAmount) {\n return plan.totalAmount.sub(releasedAmount);\n } else {\n return uint256(0);\n }\n // during the vesting duration, exclude cliff\n } else {\n uint256 accumulatstartTime =\n (plan.accumulateDuringCliff ? plan.startTime : plan.startTime + plan.cliffDuration);\n uint256 totalDuration =\n (plan.accumulateDuringCliff ? plan.duration.add(plan.cliffDuration) : plan.duration);\n\n uint256 intervalCounts;\n if (plan.vestingType == VestingType.TIME) {\n intervalCounts = (\n totalDuration.mod(plan.interval) == 0\n ? totalDuration.div(plan.interval)\n : totalDuration.div(plan.interval).add(1)\n );\n } else {\n intervalCounts = totalDuration;\n }\n\n uint256 planInterval = (plan.vestingType == VestingType.TIME ? plan.interval : 1);\n\n uint256 accumulatedAmount =\n plan.totalAmount.sub(plan.initialAmount).mul(currentTime.sub(accumulatstartTime).div(planInterval)).div(\n intervalCounts\n );\n\n return accumulatedAmount.add(plan.initialAmount).sub(releasedAmount);\n }\n }\n}\n" }, "@openzeppelin/contracts/token/ERC20/ERC20.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"../../utils/Context.sol\";\nimport \"./IERC20.sol\";\nimport \"../../math/SafeMath.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin guidelines: functions revert instead\n * of returning `false` on failure. This behavior is nonetheless conventional\n * and does not conflict with the expectations of ERC20 applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is Context, IERC20 {\n using SafeMath for uint256;\n\n mapping (address => uint256) private _balances;\n\n mapping (address => mapping (address => uint256)) private _allowances;\n\n uint256 private _totalSupply;\n\n string private _name;\n string private _symbol;\n uint8 private _decimals;\n\n /**\n * @dev Sets the values for {name} and {symbol}, initializes {decimals} with\n * a default value of 18.\n *\n * To select a different value for {decimals}, use {_setupDecimals}.\n *\n * All three of these values are immutable: they can only be set once during\n * construction.\n */\n constructor (string memory name_, string memory symbol_) public {\n _name = name_;\n _symbol = symbol_;\n _decimals = 18;\n }\n\n /**\n * @dev Returns the name of the token.\n */\n function name() public view virtual returns (string memory) {\n return _name;\n }\n\n /**\n * @dev Returns the symbol of the token, usually a shorter version of the\n * name.\n */\n function symbol() public view virtual returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev Returns the number of decimals used to get its user representation.\n * For example, if `decimals` equals `2`, a balance of `505` tokens should\n * be displayed to a user as `5,05` (`505 / 10 ** 2`).\n *\n * Tokens usually opt for a value of 18, imitating the relationship between\n * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\n * called.\n *\n * NOTE: This information is only used for _display_ purposes: it in\n * no way affects any of the arithmetic of the contract, including\n * {IERC20-balanceOf} and {IERC20-transfer}.\n */\n function decimals() public view virtual returns (uint8) {\n return _decimals;\n }\n\n /**\n * @dev See {IERC20-totalSupply}.\n */\n function totalSupply() public view virtual override returns (uint256) {\n return _totalSupply;\n }\n\n /**\n * @dev See {IERC20-balanceOf}.\n */\n function balanceOf(address account) public view virtual override returns (uint256) {\n return _balances[account];\n }\n\n /**\n * @dev See {IERC20-transfer}.\n *\n * Requirements:\n *\n * - `recipient` cannot be the zero address.\n * - the caller must have a balance of at least `amount`.\n */\n function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\n _transfer(_msgSender(), recipient, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-allowance}.\n */\n function allowance(address owner, address spender) public view virtual override returns (uint256) {\n return _allowances[owner][spender];\n }\n\n /**\n * @dev See {IERC20-approve}.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function approve(address spender, uint256 amount) public virtual override returns (bool) {\n _approve(_msgSender(), spender, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-transferFrom}.\n *\n * Emits an {Approval} event indicating the updated allowance. This is not\n * required by the EIP. See the note at the beginning of {ERC20}.\n *\n * Requirements:\n *\n * - `sender` and `recipient` cannot be the zero address.\n * - `sender` must have a balance of at least `amount`.\n * - the caller must have allowance for ``sender``'s tokens of at least\n * `amount`.\n */\n function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {\n _transfer(sender, recipient, amount);\n _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, \"ERC20: transfer amount exceeds allowance\"));\n return true;\n }\n\n /**\n * @dev Atomically increases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));\n return true;\n }\n\n /**\n * @dev Atomically decreases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n * - `spender` must have allowance for the caller of at least\n * `subtractedValue`.\n */\n function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, \"ERC20: decreased allowance below zero\"));\n return true;\n }\n\n /**\n * @dev Moves tokens `amount` from `sender` to `recipient`.\n *\n * This is internal function is equivalent to {transfer}, and can be used to\n * e.g. implement automatic token fees, slashing mechanisms, etc.\n *\n * Emits a {Transfer} event.\n *\n * Requirements:\n *\n * - `sender` cannot be the zero address.\n * - `recipient` cannot be the zero address.\n * - `sender` must have a balance of at least `amount`.\n */\n function _transfer(address sender, address recipient, uint256 amount) internal virtual {\n require(sender != address(0), \"ERC20: transfer from the zero address\");\n require(recipient != address(0), \"ERC20: transfer to the zero address\");\n\n _beforeTokenTransfer(sender, recipient, amount);\n\n _balances[sender] = _balances[sender].sub(amount, \"ERC20: transfer amount exceeds balance\");\n _balances[recipient] = _balances[recipient].add(amount);\n emit Transfer(sender, recipient, amount);\n }\n\n /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n * the total supply.\n *\n * Emits a {Transfer} event with `from` set to the zero address.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n */\n function _mint(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: mint to the zero address\");\n\n _beforeTokenTransfer(address(0), account, amount);\n\n _totalSupply = _totalSupply.add(amount);\n _balances[account] = _balances[account].add(amount);\n emit Transfer(address(0), account, amount);\n }\n\n /**\n * @dev Destroys `amount` tokens from `account`, reducing the\n * total supply.\n *\n * Emits a {Transfer} event with `to` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n * - `account` must have at least `amount` tokens.\n */\n function _burn(address account, uint256 amount) internal virtual {\n require(account != address(0), \"ERC20: burn from the zero address\");\n\n _beforeTokenTransfer(account, address(0), amount);\n\n _balances[account] = _balances[account].sub(amount, \"ERC20: burn amount exceeds balance\");\n _totalSupply = _totalSupply.sub(amount);\n emit Transfer(account, address(0), amount);\n }\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n *\n * This internal function is equivalent to `approve`, and can be used to\n * e.g. set automatic allowances for certain subsystems, etc.\n *\n * Emits an {Approval} event.\n *\n * Requirements:\n *\n * - `owner` cannot be the zero address.\n * - `spender` cannot be the zero address.\n */\n function _approve(address owner, address spender, uint256 amount) internal virtual {\n require(owner != address(0), \"ERC20: approve from the zero address\");\n require(spender != address(0), \"ERC20: approve to the zero address\");\n\n _allowances[owner][spender] = amount;\n emit Approval(owner, spender, amount);\n }\n\n /**\n * @dev Sets {decimals} to a value other than the default one of 18.\n *\n * WARNING: This function should only be called from the constructor. Most\n * applications that interact with token contracts will not expect\n * {decimals} to ever change, and may work incorrectly if it does.\n */\n function _setupDecimals(uint8 decimals_) internal virtual {\n _decimals = decimals_;\n }\n\n /**\n * @dev Hook that is called before any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * will be to transferred to `to`.\n * - when `from` is zero, `amount` tokens will be minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }\n}\n" }, "@openzeppelin/contracts/access/Ownable.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\nimport \"../utils/Context.sol\";\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 () internal {\n address msgSender = _msgSender();\n _owner = msgSender;\n emit OwnershipTransferred(address(0), 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 emit OwnershipTransferred(_owner, address(0));\n _owner = 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 emit OwnershipTransferred(_owner, newOwner);\n _owner = newOwner;\n }\n}\n" }, "@openzeppelin/contracts/math/SafeMath.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\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 uint256 c = a + b;\n if (c < a) return (false, 0);\n return (true, c);\n }\n\n /**\n * @dev Returns the substraction 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 if (b > a) return (false, 0);\n return (true, a - b);\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 // 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 * @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 if (b == 0) return (false, 0);\n return (true, a / b);\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 if (b == 0) return (false, 0);\n return (true, a % b);\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 uint256 c = a + b;\n require(c >= a, \"SafeMath: addition overflow\");\n return c;\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 require(b <= a, \"SafeMath: subtraction overflow\");\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 if (a == 0) return 0;\n uint256 c = a * b;\n require(c / a == b, \"SafeMath: multiplication overflow\");\n return c;\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. 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(uint256 a, uint256 b) internal pure returns (uint256) {\n require(b > 0, \"SafeMath: division by zero\");\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 require(b > 0, \"SafeMath: modulo by zero\");\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(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n require(b <= a, errorMessage);\n return a - b;\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 * CAUTION: This function is deprecated because it requires allocating memory for the error\n * message unnecessarily. For custom revert reasons use {tryDiv}.\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(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n require(b > 0, errorMessage);\n return a / b;\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(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\n require(b > 0, errorMessage);\n return a % b;\n }\n}\n" }, "@openzeppelin/contracts/utils/Context.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <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 GSN 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 payable) {\n return msg.sender;\n }\n\n function _msgData() internal view virtual returns (bytes memory) {\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\n return msg.data;\n }\n}\n" }, "@openzeppelin/contracts/token/ERC20/IERC20.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity >=0.6.0 <0.8.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\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 `recipient`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address recipient, 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 `sender` to `recipient` 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(address sender, address recipient, uint256 amount) external returns (bool);\n\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" } }, "settings": { "optimizer": { "enabled": false, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} } }}

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