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{IERC20-allowance}."},"approve(address,uint256)":{"details":"See {IERC20-approve}. * Requirements: * - `spender` cannot be the zero address."},"balanceOf(address)":{"details":"See {IERC20-balanceOf}."},"decimals()":{"details":"Returns the number of decimals used to get its user representation. For example, if `decimals` equals `2`, a balance of `505` tokens should be displayed to a user as `5,05` (`505 / 10 ** 2`). * Tokens usually opt for a value of 18, imitating the relationship between Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is called. * NOTE: This information is only used for _display_ purposes: it in no way affects any of the arithmetic of the contract, including {IERC20-balanceOf} and {IERC20-transfer}."},"decreaseAllowance(address,uint256)":{"details":"Atomically decreases the allowance granted to `spender` by the caller. * This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. * Emits an {Approval} event indicating the updated allowance. * Requirements: * - `spender` cannot be the zero address. - `spender` must have allowance for the caller of at least `subtractedValue`."},"deposit(address,bytes)":{"details":"Should be callable only by ChildChainManager Should handle deposit by minting the required amount for user Make sure minting is done only by this function","params":{"depositData":"abi encoded amount","user":"user address for whom deposit is being done"}},"getRoleAdmin(bytes32)":{"details":"Returns the admin role that controls `role`. See {grantRole} and {revokeRole}. * To change a role's admin, use {_setRoleAdmin}."},"getRoleMember(bytes32,uint256)":{"details":"Returns one of the accounts that have `role`. `index` must be a value between 0 and {getRoleMemberCount}, non-inclusive. * Role bearers are not sorted in any particular way, and their ordering may change at any point. * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure you perform all queries on the same block. See the following https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] for more information."},"getRoleMemberCount(bytes32)":{"details":"Returns the number of accounts that have `role`. Can be used together with {getRoleMember} to enumerate all bearers of a role."},"grantRole(bytes32,address)":{"details":"Grants `role` to `account`. * If `account` had not been already granted `role`, emits a {RoleGranted} event. * Requirements: * - the caller must have ``role``'s admin role."},"hasRole(bytes32,address)":{"details":"Returns `true` if `account` has been granted `role`."},"increaseAllowance(address,uint256)":{"details":"Atomically increases the allowance granted to `spender` by the caller. * This is an alternative to {approve} that can be used as a mitigation for problems described in {IERC20-approve}. * Emits an {Approval} event indicating the updated allowance. * Requirements: * - `spender` cannot be the zero address."},"initialize(string,string,uint8,address)":{"details":"meant to be called once immediately after deployment"},"name()":{"details":"Returns the name of the token."},"renounceRole(bytes32,address)":{"details":"Revokes `role` from the calling account. * Roles are often managed via {grantRole} and {revokeRole}: this function's purpose is to provide a mechanism for accounts to lose their privileges if they are compromised (such as when a trusted device is misplaced). * If the calling account had been granted `role`, emits a {RoleRevoked} event. * Requirements: * - the caller must be `account`."},"revokeRole(bytes32,address)":{"details":"Revokes `role` from `account`. * If `account` had been granted `role`, emits a {RoleRevoked} event. * Requirements: * - the caller must have ``role``'s admin role."},"symbol()":{"details":"Returns the symbol of the token, usually a shorter version of the name."},"totalSupply()":{"details":"See {IERC20-totalSupply}."},"transfer(address,uint256)":{"details":"See {IERC20-transfer}. * Requirements: * - `recipient` cannot be the zero address. - the caller must have a balance of at least `amount`."},"transferFrom(address,address,uint256)":{"details":"See {IERC20-transferFrom}. * Emits an {Approval} event indicating the updated allowance. This is not required by the EIP. See the note at the beginning of {ERC20}; * Requirements: - `sender` and `recipient` cannot be the zero address. - `sender` must have a balance of at least `amount`. - the caller must have allowance for ``sender``'s tokens of at least `amount`."},"withdraw(uint256)":{"details":"Should burn user's tokens. This transaction will be verified when exiting on root chain","params":{"amount":"amount of tokens to withdraw"}}}},"userdoc":{"methods":{"deposit(address,bytes)":{"notice":"called when token is deposited on root chain"},"initialize(string,string,uint8,address)":{"notice":"Initialize the contract after it has been proxified"},"withdraw(uint256)":{"notice":"called when user wants to withdraw tokens back to root chain"}}}},"settings":{"compilationTarget":{"UChildDAI.sol":"UChildDAI"},"evmVersion":"istanbul","libraries":{},"metadata":{"bytecodeHash":"ipfs"},"optimizer":{"enabled":false,"runs":200},"remappings":[]},"sources":{"UChildDAI.sol":{"keccak256":"0x4ff310d88644ca58a63d91b4d846080deef9dc6a367d75c46ed91f9670824760","urls":["bzz-raw://5ea03c0c4e2b9c5568fe29a971f3be4ea34acf75b677e52098a19772d9043c7d","dweb:/ipfs/QmbCUxT24oq16wdHa5SJgcJUSAoEBPB1hhDZu619bVRRXm"]}},"version":1},"sources":{"UChildDAI.sol":{"content":"// File: @openzeppelin/contracts/GSN/Context.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/*\r\n * @dev Provides information about the current execution context, including the\r\n * sender of the transaction and its data. While these are generally available\r\n * via msg.sender and msg.data, they should not be accessed in such a direct\r\n * manner, since when dealing with GSN meta-transactions the account sending and\r\n * paying for execution may not be the actual sender (as far as an application\r\n * is concerned).\r\n *\r\n * This contract is only required for intermediate, library-like contracts.\r\n */\r\nabstract contract Context {\r\n function _msgSender() internal view virtual returns (address payable) {\r\n return msg.sender;\r\n }\r\n\r\n function _msgData() internal view virtual returns (bytes memory) {\r\n this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\r\n return msg.data;\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/token/ERC20/IERC20.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Interface of the ERC20 standard as defined in the EIP.\r\n */\r\ninterface IERC20 {\r\n /**\r\n * @dev Returns the amount of tokens in existence.\r\n */\r\n function totalSupply() external view returns (uint256);\r\n\r\n /**\r\n * @dev Returns the amount of tokens owned by `account`.\r\n */\r\n function balanceOf(address account) external view returns (uint256);\r\n\r\n /**\r\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function transfer(address recipient, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Returns the remaining number of tokens that `spender` will be\r\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\r\n * zero by default.\r\n *\r\n * This value changes when {approve} or {transferFrom} are called.\r\n */\r\n function allowance(address owner, address spender) external view returns (uint256);\r\n\r\n /**\r\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\r\n * that someone may use both the old and the new allowance by unfortunate\r\n * transaction ordering. One possible solution to mitigate this race\r\n * condition is to first reduce the spender's allowance to 0 and set the\r\n * desired value afterwards:\r\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r\n *\r\n * Emits an {Approval} event.\r\n */\r\n function approve(address spender, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\r\n * allowance mechanism. `amount` is then deducted from the caller's\r\n * allowance.\r\n *\r\n * Returns a boolean value indicating whether the operation succeeded.\r\n *\r\n * Emits a {Transfer} event.\r\n */\r\n function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);\r\n\r\n /**\r\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\r\n * another (`to`).\r\n *\r\n * Note that `value` may be zero.\r\n */\r\n event Transfer(address indexed from, address indexed to, uint256 value);\r\n\r\n /**\r\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r\n * a call to {approve}. `value` is the new allowance.\r\n */\r\n event Approval(address indexed owner, address indexed spender, uint256 value);\r\n}\r\n\r\n// File: @openzeppelin/contracts/math/SafeMath.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\r\n * checks.\r\n *\r\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\r\n * in bugs, because programmers usually assume that an overflow raises an\r\n * error, which is the standard behavior in high level programming languages.\r\n * `SafeMath` restores this intuition by reverting the transaction when an\r\n * operation overflows.\r\n *\r\n * Using this library instead of the unchecked operations eliminates an entire\r\n * class of bugs, so it's recommended to use it always.\r\n */\r\nlibrary SafeMath {\r\n /**\r\n * @dev Returns the addition of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity's `+` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Addition cannot overflow.\r\n */\r\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\r\n uint256 c = a + b;\r\n require(c >= a, \"SafeMath: addition overflow\");\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting on\r\n * overflow (when the result is negative).\r\n *\r\n * Counterpart to Solidity's `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return sub(a, b, \"SafeMath: subtraction overflow\");\r\n }\r\n\r\n /**\r\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r\n * overflow (when the result is negative).\r\n *\r\n * Counterpart to Solidity's `-` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Subtraction cannot overflow.\r\n */\r\n function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b <= a, errorMessage);\r\n uint256 c = a - b;\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the multiplication of two unsigned integers, reverting on\r\n * overflow.\r\n *\r\n * Counterpart to Solidity's `*` operator.\r\n *\r\n * Requirements:\r\n *\r\n * - Multiplication cannot overflow.\r\n */\r\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r\n // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r\n // benefit is lost if 'b' is also tested.\r\n // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r\n if (a == 0) {\r\n return 0;\r\n }\r\n\r\n uint256 c = a * b;\r\n require(c / a == b, \"SafeMath: multiplication overflow\");\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers. Reverts on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return div(a, b, \"SafeMath: division by zero\");\r\n }\r\n\r\n /**\r\n * @dev Returns the integer division of two unsigned integers. Reverts with custom message on\r\n * division by zero. The result is rounded towards zero.\r\n *\r\n * Counterpart to Solidity's `/` operator. Note: this function uses a\r\n * `revert` opcode (which leaves remaining gas untouched) while Solidity\r\n * uses an invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b > 0, errorMessage);\r\n uint256 c = a / b;\r\n // assert(a == b * c + a % b); // There is no case in which this doesn't hold\r\n\r\n return c;\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * Reverts when dividing by zero.\r\n *\r\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r\n return mod(a, b, \"SafeMath: modulo by zero\");\r\n }\r\n\r\n /**\r\n * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r\n * Reverts with custom message when dividing by zero.\r\n *\r\n * Counterpart to Solidity's `%` operator. This function uses a `revert`\r\n * opcode (which leaves remaining gas untouched) while Solidity uses an\r\n * invalid opcode to revert (consuming all remaining gas).\r\n *\r\n * Requirements:\r\n *\r\n * - The divisor cannot be zero.\r\n */\r\n function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {\r\n require(b != 0, errorMessage);\r\n return a % b;\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/Address.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.2;\r\n\r\n/**\r\n * @dev Collection of functions related to the address type\r\n */\r\nlibrary Address {\r\n /**\r\n * @dev Returns true if `account` is a contract.\r\n *\r\n * [IMPORTANT]\r\n * ====\r\n * It is unsafe to assume that an address for which this function returns\r\n * false is an externally-owned account (EOA) and not a contract.\r\n *\r\n * Among others, `isContract` will return false for the following\r\n * types of addresses:\r\n *\r\n * - an externally-owned account\r\n * - a contract in construction\r\n * - an address where a contract will be created\r\n * - an address where a contract lived, but was destroyed\r\n * ====\r\n */\r\n function isContract(address account) internal view returns (bool) {\r\n // According to EIP-1052, 0x0 is the value returned for not-yet created accounts\r\n // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned\r\n // for accounts without code, i.e. `keccak256('')`\r\n bytes32 codehash;\r\n bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;\r\n // solhint-disable-next-line no-inline-assembly\r\n assembly { codehash := extcodehash(account) }\r\n return (codehash != accountHash && codehash != 0x0);\r\n }\r\n\r\n /**\r\n * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r\n * `recipient`, forwarding all available gas and reverting on errors.\r\n *\r\n * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r\n * of certain opcodes, possibly making contracts go over the 2300 gas limit\r\n * imposed by `transfer`, making them unable to receive funds via\r\n * `transfer`. {sendValue} removes this limitation.\r\n *\r\n * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r\n *\r\n * IMPORTANT: because control is transferred to `recipient`, care must be\r\n * taken to not create reentrancy vulnerabilities. Consider using\r\n * {ReentrancyGuard} or the\r\n * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r\n */\r\n function sendValue(address payable recipient, uint256 amount) internal {\r\n require(address(this).balance >= amount, \"Address: insufficient balance\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r\n (bool success, ) = recipient.call{ value: amount }(\"\");\r\n require(success, \"Address: unable to send value, recipient may have reverted\");\r\n }\r\n\r\n /**\r\n * @dev Performs a Solidity function call using a low level `call`. A\r\n * plain`call` is an unsafe replacement for a function call: use this\r\n * function instead.\r\n *\r\n * If `target` reverts with a revert reason, it is bubbled up by this\r\n * function (like regular Solidity function calls).\r\n *\r\n * Returns the raw returned data. To convert to the expected return value,\r\n * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r\n *\r\n * Requirements:\r\n *\r\n * - `target` must be a contract.\r\n * - calling `target` with `data` must not revert.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(address target, bytes memory data) internal returns (bytes memory) {\r\n return functionCall(target, data, \"Address: low-level call failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r\n * `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {\r\n return _functionCallWithValue(target, data, 0, errorMessage);\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r\n * but also transferring `value` wei to `target`.\r\n *\r\n * Requirements:\r\n *\r\n * - the calling contract must have an ETH balance of at least `value`.\r\n * - the called Solidity function must be `payable`.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {\r\n return functionCallWithValue(target, data, value, \"Address: low-level call with value failed\");\r\n }\r\n\r\n /**\r\n * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r\n * with `errorMessage` as a fallback revert reason when `target` reverts.\r\n *\r\n * _Available since v3.1._\r\n */\r\n function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {\r\n require(address(this).balance >= value, \"Address: insufficient balance for call\");\r\n return _functionCallWithValue(target, data, value, errorMessage);\r\n }\r\n\r\n function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {\r\n require(isContract(target), \"Address: call to non-contract\");\r\n\r\n // solhint-disable-next-line avoid-low-level-calls\r\n (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);\r\n if (success) {\r\n return returndata;\r\n } else {\r\n // Look for revert reason and bubble it up if present\r\n if (returndata.length > 0) {\r\n // The easiest way to bubble the revert reason is using memory via assembly\r\n\r\n // solhint-disable-next-line no-inline-assembly\r\n assembly {\r\n let returndata_size := mload(returndata)\r\n revert(add(32, returndata), returndata_size)\r\n }\r\n } else {\r\n revert(errorMessage);\r\n }\r\n }\r\n }\r\n}\r\n\r\n// File: contracts/child/ChildToken/UpgradeableChildERC20/ERC20.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n\r\n\r\n\r\n/**\r\n * Modified openzeppelin implemtation to add setters for name, symbol and decimals.\r\n * This was needed because the variables cannot be set in constructor as the contract is upgradeable.\r\n */\r\n\r\n/**\r\n * @dev openzeppelin Implementation of the {IERC20} interface.\r\n *\r\n * Modified to add setters for name, symbol and decimals. This was needed\r\n * because\r\n *\r\n * This implementation is agnostic to the way tokens are created. This means\r\n * that a supply mechanism has to be added in a derived contract using {_mint}.\r\n * For a generic mechanism see {ERC20PresetMinterPauser}.\r\n *\r\n * TIP: For a detailed writeup see our guide\r\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\r\n * to implement supply mechanisms].\r\n *\r\n * We have followed general OpenZeppelin guidelines: functions revert instead\r\n * of returning `false` on failure. This behavior is nonetheless conventional\r\n * and does not conflict with the expectations of ERC20 applications.\r\n *\r\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\r\n * This allows applications to reconstruct the allowance for all accounts just\r\n * by listening to said events. Other implementations of the EIP may not emit\r\n * these events, as it isn't required by the specification.\r\n *\r\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\r\n * functions have been added to mitigate the well-known issues around setting\r\n * allowances. See {IERC20-approve}.\r\n */\r\ncontract ERC20 is Context, IERC20 {\r\n using SafeMath for uint256;\r\n using Address for address;\r\n\r\n mapping (address => uint256) private _balances;\r\n\r\n mapping (address => mapping (address => uint256)) private _allowances;\r\n\r\n uint256 private _totalSupply;\r\n\r\n string private _name;\r\n string private _symbol;\r\n uint8 private _decimals;\r\n\r\n /**\r\n * @dev Sets the values for {name} and {symbol}, initializes {decimals} with\r\n * a default value of 18.\r\n *\r\n * To select a different value for {decimals}, use {_setupDecimals}.\r\n *\r\n * All three of these values are immutable: they can only be set once during\r\n * construction.\r\n */\r\n constructor (string memory name, string memory symbol) public {\r\n _name = name;\r\n _symbol = symbol;\r\n _decimals = 18;\r\n }\r\n\r\n /**\r\n * @dev Returns the name of the token.\r\n */\r\n function name() public view returns (string memory) {\r\n return _name;\r\n }\r\n\r\n function setName(string memory newName) internal {\r\n _name = newName;\r\n }\r\n\r\n /**\r\n * @dev Returns the symbol of the token, usually a shorter version of the\r\n * name.\r\n */\r\n function symbol() public view returns (string memory) {\r\n return _symbol;\r\n }\r\n\r\n function setSymbol(string memory newSymbol) internal {\r\n _symbol = newSymbol;\r\n }\r\n\r\n /**\r\n * @dev Returns the number of decimals used to get its user representation.\r\n * For example, if `decimals` equals `2`, a balance of `505` tokens should\r\n * be displayed to a user as `5,05` (`505 / 10 ** 2`).\r\n *\r\n * Tokens usually opt for a value of 18, imitating the relationship between\r\n * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\r\n * called.\r\n *\r\n * NOTE: This information is only used for _display_ purposes: it in\r\n * no way affects any of the arithmetic of the contract, including\r\n * {IERC20-balanceOf} and {IERC20-transfer}.\r\n */\r\n function decimals() public view returns (uint8) {\r\n return _decimals;\r\n }\r\n\r\n function setDecimals(uint8 newDecimals) internal {\r\n _decimals = newDecimals;\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-totalSupply}.\r\n */\r\n function totalSupply() public view override returns (uint256) {\r\n return _totalSupply;\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-balanceOf}.\r\n */\r\n function balanceOf(address account) public view override returns (uint256) {\r\n return _balances[account];\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-transfer}.\r\n *\r\n * Requirements:\r\n *\r\n * - `recipient` cannot be the zero address.\r\n * - the caller must have a balance of at least `amount`.\r\n */\r\n function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\r\n _transfer(_msgSender(), recipient, amount);\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-allowance}.\r\n */\r\n function allowance(address owner, address spender) public view virtual override returns (uint256) {\r\n return _allowances[owner][spender];\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-approve}.\r\n *\r\n * Requirements:\r\n *\r\n * - `spender` cannot be the zero address.\r\n */\r\n function approve(address spender, uint256 amount) public virtual override returns (bool) {\r\n _approve(_msgSender(), spender, amount);\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev See {IERC20-transferFrom}.\r\n *\r\n * Emits an {Approval} event indicating the updated allowance. This is not\r\n * required by the EIP. See the note at the beginning of {ERC20};\r\n *\r\n * Requirements:\r\n * - `sender` and `recipient` cannot be the zero address.\r\n * - `sender` must have a balance of at least `amount`.\r\n * - the caller must have allowance for ``sender``'s tokens of at least\r\n * `amount`.\r\n */\r\n function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {\r\n _transfer(sender, recipient, amount);\r\n _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, \"ERC20: transfer amount exceeds allowance\"));\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev Atomically increases the allowance granted to `spender` by the caller.\r\n *\r\n * This is an alternative to {approve} that can be used as a mitigation for\r\n * problems described in {IERC20-approve}.\r\n *\r\n * Emits an {Approval} event indicating the updated allowance.\r\n *\r\n * Requirements:\r\n *\r\n * - `spender` cannot be the zero address.\r\n */\r\n function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\r\n _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev Atomically decreases the allowance granted to `spender` by the caller.\r\n *\r\n * This is an alternative to {approve} that can be used as a mitigation for\r\n * problems described in {IERC20-approve}.\r\n *\r\n * Emits an {Approval} event indicating the updated allowance.\r\n *\r\n * Requirements:\r\n *\r\n * - `spender` cannot be the zero address.\r\n * - `spender` must have allowance for the caller of at least\r\n * `subtractedValue`.\r\n */\r\n function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\r\n _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, \"ERC20: decreased allowance below zero\"));\r\n return true;\r\n }\r\n\r\n /**\r\n * @dev Moves tokens `amount` from `sender` to `recipient`.\r\n *\r\n * This is internal function is equivalent to {transfer}, and can be used to\r\n * e.g. implement automatic token fees, slashing mechanisms, etc.\r\n *\r\n * Emits a {Transfer} event.\r\n *\r\n * Requirements:\r\n *\r\n * - `sender` cannot be the zero address.\r\n * - `recipient` cannot be the zero address.\r\n * - `sender` must have a balance of at least `amount`.\r\n */\r\n function _transfer(address sender, address recipient, uint256 amount) internal virtual {\r\n require(sender != address(0), \"ERC20: transfer from the zero address\");\r\n require(recipient != address(0), \"ERC20: transfer to the zero address\");\r\n\r\n _beforeTokenTransfer(sender, recipient, amount);\r\n\r\n _balances[sender] = _balances[sender].sub(amount, \"ERC20: transfer amount exceeds balance\");\r\n _balances[recipient] = _balances[recipient].add(amount);\r\n emit Transfer(sender, recipient, amount);\r\n }\r\n\r\n /** @dev Creates `amount` tokens and assigns them to `account`, increasing\r\n * the total supply.\r\n *\r\n * Emits a {Transfer} event with `from` set to the zero address.\r\n *\r\n * Requirements\r\n *\r\n * - `to` cannot be the zero address.\r\n */\r\n function _mint(address account, uint256 amount) internal virtual {\r\n require(account != address(0), \"ERC20: mint to the zero address\");\r\n\r\n _beforeTokenTransfer(address(0), account, amount);\r\n\r\n _totalSupply = _totalSupply.add(amount);\r\n _balances[account] = _balances[account].add(amount);\r\n emit Transfer(address(0), account, amount);\r\n }\r\n\r\n /**\r\n * @dev Destroys `amount` tokens from `account`, reducing the\r\n * total supply.\r\n *\r\n * Emits a {Transfer} event with `to` set to the zero address.\r\n *\r\n * Requirements\r\n *\r\n * - `account` cannot be the zero address.\r\n * - `account` must have at least `amount` tokens.\r\n */\r\n function _burn(address account, uint256 amount) internal virtual {\r\n require(account != address(0), \"ERC20: burn from the zero address\");\r\n\r\n _beforeTokenTransfer(account, address(0), amount);\r\n\r\n _balances[account] = _balances[account].sub(amount, \"ERC20: burn amount exceeds balance\");\r\n _totalSupply = _totalSupply.sub(amount);\r\n emit Transfer(account, address(0), amount);\r\n }\r\n\r\n /**\r\n * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.\r\n *\r\n * This is internal function is equivalent to `approve`, and can be used to\r\n * e.g. set automatic allowances for certain subsystems, etc.\r\n *\r\n * Emits an {Approval} event.\r\n *\r\n * Requirements:\r\n *\r\n * - `owner` cannot be the zero address.\r\n * - `spender` cannot be the zero address.\r\n */\r\n function _approve(address owner, address spender, uint256 amount) internal virtual {\r\n require(owner != address(0), \"ERC20: approve from the zero address\");\r\n require(spender != address(0), \"ERC20: approve to the zero address\");\r\n\r\n _allowances[owner][spender] = amount;\r\n emit Approval(owner, spender, amount);\r\n }\r\n\r\n /**\r\n * @dev Sets {decimals} to a value other than the default one of 18.\r\n *\r\n * WARNING: This function should only be called from the constructor. Most\r\n * applications that interact with token contracts will not expect\r\n * {decimals} to ever change, and may work incorrectly if it does.\r\n */\r\n function _setupDecimals(uint8 decimals_) internal {\r\n _decimals = decimals_;\r\n }\r\n\r\n /**\r\n * @dev Hook that is called before any transfer of tokens. This includes\r\n * minting and burning.\r\n *\r\n * Calling conditions:\r\n *\r\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\r\n * will be to transferred to `to`.\r\n * - when `from` is zero, `amount` tokens will be minted for `to`.\r\n * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\r\n * - `from` and `to` are never both zero.\r\n *\r\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\r\n */\r\n function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }\r\n}\r\n\r\n// File: @openzeppelin/contracts/utils/EnumerableSet.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n/**\r\n * @dev Library for managing\r\n * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive\r\n * types.\r\n *\r\n * Sets have the following properties:\r\n *\r\n * - Elements are added, removed, and checked for existence in constant time\r\n * (O(1)).\r\n * - Elements are enumerated in O(n). No guarantees are made on the ordering.\r\n *\r\n * ```\r\n * contract Example {\r\n * // Add the library methods\r\n * using EnumerableSet for EnumerableSet.AddressSet;\r\n *\r\n * // Declare a set state variable\r\n * EnumerableSet.AddressSet private mySet;\r\n * }\r\n * ```\r\n *\r\n * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`\r\n * (`UintSet`) are supported.\r\n */\r\nlibrary EnumerableSet {\r\n // To implement this library for multiple types with as little code\r\n // repetition as possible, we write it in terms of a generic Set type with\r\n // bytes32 values.\r\n // The Set implementation uses private functions, and user-facing\r\n // implementations (such as AddressSet) are just wrappers around the\r\n // underlying Set.\r\n // This means that we can only create new EnumerableSets for types that fit\r\n // in bytes32.\r\n\r\n struct Set {\r\n // Storage of set values\r\n bytes32[] _values;\r\n\r\n // Position of the value in the `values` array, plus 1 because index 0\r\n // means a value is not in the set.\r\n mapping (bytes32 => uint256) _indexes;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function _add(Set storage set, bytes32 value) private returns (bool) {\r\n if (!_contains(set, value)) {\r\n set._values.push(value);\r\n // The value is stored at length-1, but we add 1 to all indexes\r\n // and use 0 as a sentinel value\r\n set._indexes[value] = set._values.length;\r\n return true;\r\n } else {\r\n return false;\r\n }\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function _remove(Set storage set, bytes32 value) private returns (bool) {\r\n // We read and store the value's index to prevent multiple reads from the same storage slot\r\n uint256 valueIndex = set._indexes[value];\r\n\r\n if (valueIndex != 0) { // Equivalent to contains(set, value)\r\n // To delete an element from the _values array in O(1), we swap the element to delete with the last one in\r\n // the array, and then remove the last element (sometimes called as 'swap and pop').\r\n // This modifies the order of the array, as noted in {at}.\r\n\r\n uint256 toDeleteIndex = valueIndex - 1;\r\n uint256 lastIndex = set._values.length - 1;\r\n\r\n // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs\r\n // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.\r\n\r\n bytes32 lastvalue = set._values[lastIndex];\r\n\r\n // Move the last value to the index where the value to delete is\r\n set._values[toDeleteIndex] = lastvalue;\r\n // Update the index for the moved value\r\n set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based\r\n\r\n // Delete the slot where the moved value was stored\r\n set._values.pop();\r\n\r\n // Delete the index for the deleted slot\r\n delete set._indexes[value];\r\n\r\n return true;\r\n } else {\r\n return false;\r\n }\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function _contains(Set storage set, bytes32 value) private view returns (bool) {\r\n return set._indexes[value] != 0;\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values on the set. O(1).\r\n */\r\n function _length(Set storage set) private view returns (uint256) {\r\n return set._values.length;\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function _at(Set storage set, uint256 index) private view returns (bytes32) {\r\n require(set._values.length > index, \"EnumerableSet: index out of bounds\");\r\n return set._values[index];\r\n }\r\n\r\n // AddressSet\r\n\r\n struct AddressSet {\r\n Set _inner;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function add(AddressSet storage set, address value) internal returns (bool) {\r\n return _add(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function remove(AddressSet storage set, address value) internal returns (bool) {\r\n return _remove(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function contains(AddressSet storage set, address value) internal view returns (bool) {\r\n return _contains(set._inner, bytes32(uint256(value)));\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values in the set. O(1).\r\n */\r\n function length(AddressSet storage set) internal view returns (uint256) {\r\n return _length(set._inner);\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function at(AddressSet storage set, uint256 index) internal view returns (address) {\r\n return address(uint256(_at(set._inner, index)));\r\n }\r\n\r\n\r\n // UintSet\r\n\r\n struct UintSet {\r\n Set _inner;\r\n }\r\n\r\n /**\r\n * @dev Add a value to a set. O(1).\r\n *\r\n * Returns true if the value was added to the set, that is if it was not\r\n * already present.\r\n */\r\n function add(UintSet storage set, uint256 value) internal returns (bool) {\r\n return _add(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Removes a value from a set. O(1).\r\n *\r\n * Returns true if the value was removed from the set, that is if it was\r\n * present.\r\n */\r\n function remove(UintSet storage set, uint256 value) internal returns (bool) {\r\n return _remove(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Returns true if the value is in the set. O(1).\r\n */\r\n function contains(UintSet storage set, uint256 value) internal view returns (bool) {\r\n return _contains(set._inner, bytes32(value));\r\n }\r\n\r\n /**\r\n * @dev Returns the number of values on the set. O(1).\r\n */\r\n function length(UintSet storage set) internal view returns (uint256) {\r\n return _length(set._inner);\r\n }\r\n\r\n /**\r\n * @dev Returns the value stored at position `index` in the set. O(1).\r\n *\r\n * Note that there are no guarantees on the ordering of values inside the\r\n * array, and it may change when more values are added or removed.\r\n *\r\n * Requirements:\r\n *\r\n * - `index` must be strictly less than {length}.\r\n */\r\n function at(UintSet storage set, uint256 index) internal view returns (uint256) {\r\n return uint256(_at(set._inner, index));\r\n }\r\n}\r\n\r\n// File: @openzeppelin/contracts/access/AccessControl.sol\r\n\r\n// SPDX-License-Identifier: MIT\r\n\r\npragma solidity ^0.6.0;\r\n\r\n\r\n\r\n\r\n/**\r\n * @dev Contract module that allows children to implement role-based access\r\n * control mechanisms.\r\n *\r\n * Roles are referred to by their `bytes32` identifier. These should be exposed\r\n * in the external API and be unique. The best way to achieve this is by\r\n * using `public constant` hash digests:\r\n *\r\n * ```\r\n * bytes32 public constant MY_ROLE = keccak256(\"MY_ROLE\");\r\n * ```\r\n *\r\n * Roles can be used to represent a set of permissions. To restrict access to a\r\n * function call, use {hasRole}:\r\n *\r\n * ```\r\n * function foo() public {\r\n * require(hasRole(MY_ROLE, msg.sender));\r\n * ...\r\n * }\r\n * ```\r\n *\r\n * Roles can be granted and revoked dynamically via the {grantRole} and\r\n * {revokeRole} functions. Each role has an associated admin role, and only\r\n * accounts that have a role's admin role can call {grantRole} and {revokeRole}.\r\n *\r\n * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means\r\n * that only accounts with this role will be able to grant or revoke other\r\n * roles. More complex role relationships can be created by using\r\n * {_setRoleAdmin}.\r\n *\r\n * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to\r\n * grant and revoke this role. Extra precautions should be taken to secure\r\n * accounts that have been granted it.\r\n */\r\nabstract contract AccessControl is Context {\r\n using EnumerableSet for EnumerableSet.AddressSet;\r\n using Address for address;\r\n\r\n struct RoleData {\r\n EnumerableSet.AddressSet members;\r\n bytes32 adminRole;\r\n }\r\n\r\n mapping (bytes32 => RoleData) private _roles;\r\n\r\n bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;\r\n\r\n /**\r\n * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`\r\n *\r\n * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite\r\n * {RoleAdminChanged} not being emitted signaling this.\r\n *\r\n * _Available since v3.1._\r\n */\r\n event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);\r\n\r\n /**\r\n * @dev Emitted when `account` is granted `role`.\r\n *\r\n * `sender` is the account that originated the contract call, an admin role\r\n * bearer except when using {_setupRole}.\r\n */\r\n event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);\r\n\r\n /**\r\n * @dev Emitted when `account` is revoked `role`.\r\n *\r\n * `sender` is the account that originated the contract call:\r\n * - if using `revokeRole`, it is the admin role bearer\r\n * - if using `renounceRole`, it is the role bearer (i.e. `account`)\r\n */\r\n event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);\r\n\r\n /**\r\n * @dev Returns `true` if `account` has been granted `role`.\r\n */\r\n function hasRole(bytes32 role, address account) public view returns (bool) {\r\n return _roles[role].members.contains(account);\r\n }\r\n\r\n /**\r\n * @dev Returns the number of accounts that have `role`. Can be used\r\n * together with {getRoleMember} to enumerate all bearers of a role.\r\n */\r\n function getRoleMemberCount(bytes32 role) public view returns (uint256) {\r\n return _roles[role].members.length();\r\n }\r\n\r\n /**\r\n * @dev Returns one of the accounts that have `role`. `index` must be a\r\n * value between 0 and {getRoleMemberCount}, non-inclusive.\r\n *\r\n * Role bearers are not sorted in any particular way, and their ordering may\r\n * change at any point.\r\n *\r\n * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure\r\n * you perform all queries on the same block. See the following\r\n * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]\r\n * for more information.\r\n */\r\n function getRoleMember(bytes32 role, uint256 index) public view returns (address) {\r\n return _roles[role].members.at(index);\r\n }\r\n\r\n /**\r\n * @dev Returns the admin role that controls `role`. See {grantRole} and\r\n * {revokeRole}.\r\n *\r\n * To change a role's admin, use {_setRoleAdmin}.\r\n */\r\n function getRoleAdmin(bytes32 role) public view returns (bytes32) {\r\n return _roles[role].adminRole;\r\n }\r\n\r\n /**\r\n * @dev Grants `role` to `account`.\r\n *\r\n * If `account` had not been already granted `role`, emits a {RoleGranted}\r\n * event.\r\n *\r\n * Requirements:\r\n *\r\n * - the caller must have ``role``'s admin role.\r\n */\r\n function grantRole(bytes32 role, address account) public virtual {\r\n require(hasRole(_roles[role].adminRole, _msgSender()), \"AccessControl: sender must be an admin to grant\");\r\n\r\n _grantRole(role, account);\r\n }\r\n\r\n /**\r\n * @dev Revokes `role` from `account`.\r\n *\r\n * If `account` had been granted `role`, emits a {RoleRevoked} event.\r\n *\r\n * Requirements:\r\n *\r\n * - the caller must have ``role``'s admin role.\r\n */\r\n function revokeRole(bytes32 role, address account) public virtual {\r\n require(hasRole(_roles[role].adminRole, _msgSender()), \"AccessControl: sender must be an admin to revoke\");\r\n\r\n _revokeRole(role, account);\r\n }\r\n\r\n /**\r\n * @dev Revokes `role` from the calling account.\r\n *\r\n * Roles are often managed via {grantRole} and {revokeRole}: this function's\r\n * purpose is to provide a mechanism for accounts to lose their privileges\r\n * if they are compromised (such as when a trusted device is misplaced).\r\n *\r\n * If the calling account had been granted `role`, emits a {RoleRevoked}\r\n * event.\r\n *\r\n * Requirements:\r\n *\r\n * - the caller must be `account`.\r\n */\r\n function renounceRole(bytes32 role, address account) public virtual {\r\n require(account == _msgSender(), \"AccessControl: can only renounce roles for self\");\r\n\r\n _revokeRole(role, account);\r\n }\r\n\r\n /**\r\n * @dev Grants `role` to `account`.\r\n *\r\n * If `account` had not been already granted `role`, emits a {RoleGranted}\r\n * event. Note that unlike {grantRole}, this function doesn't perform any\r\n * checks on the calling account.\r\n *\r\n * [WARNING]\r\n * ====\r\n * This function should only be called from the constructor when setting\r\n * up the initial roles for the system.\r\n *\r\n * Using this function in any other way is effectively circumventing the admin\r\n * system imposed by {AccessControl}.\r\n * ====\r\n */\r\n function _setupRole(bytes32 role, address account) internal virtual {\r\n _grantRole(role, account);\r\n }\r\n\r\n /**\r\n * @dev Sets `adminRole` as ``role``'s admin role.\r\n *\r\n * Emits a {RoleAdminChanged} event.\r\n */\r\n function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {\r\n emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);\r\n _roles[role].adminRole = adminRole;\r\n }\r\n\r\n function _grantRole(bytes32 role, address account) private {\r\n if (_roles[role].members.add(account)) {\r\n emit RoleGranted(role, account, _msgSender());\r\n }\r\n }\r\n\r\n function _revokeRole(bytes32 role, address account) private {\r\n if (_roles[role].members.remove(account)) {\r\n emit RoleRevoked(role, account, _msgSender());\r\n }\r\n }\r\n}\r\n\r\n// File: contracts/common/AccessControlMixin.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\n\r\ncontract AccessControlMixin is AccessControl {\r\n string private _revertMsg;\r\n function _setupContractId(string memory contractId) internal {\r\n _revertMsg = string(abi.encodePacked(contractId, \": INSUFFICIENT_PERMISSIONS\"));\r\n }\r\n\r\n modifier only(bytes32 role) {\r\n require(\r\n hasRole(role, _msgSender()),\r\n _revertMsg\r\n );\r\n _;\r\n }\r\n}\r\n\r\n// File: contracts/child/ChildToken/IChildToken.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\ninterface IChildToken {\r\n function deposit(address user, bytes calldata depositData) external;\r\n}\r\n\r\n// File: contracts/common/Initializable.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\ncontract Initializable {\r\n bool inited = false;\r\n\r\n modifier initializer() {\r\n require(!inited, \"already inited\");\r\n _;\r\n inited = true;\r\n }\r\n}\r\n\r\n// File: contracts/common/EIP712Base.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\n\r\ncontract EIP712Base is Initializable {\r\n struct EIP712Domain {\r\n string name;\r\n string version;\r\n address verifyingContract;\r\n bytes32 salt;\r\n }\r\n\r\n bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256(\r\n bytes(\r\n \"EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)\"\r\n )\r\n );\r\n bytes32 internal domainSeperator;\r\n\r\n // supposed to be called once while initializing.\r\n // one of the contractsa that inherits this contract follows proxy pattern\r\n // so it is not possible to do this in a constructor\r\n function _initializeEIP712(\r\n string memory name,\r\n string memory version\r\n )\r\n internal\r\n initializer\r\n {\r\n _setDomainSeperator(name, version);\r\n }\r\n\r\n function _setDomainSeperator(string memory name, string memory version) internal {\r\n domainSeperator = keccak256(\r\n abi.encode(\r\n EIP712_DOMAIN_TYPEHASH,\r\n keccak256(bytes(name)),\r\n keccak256(bytes(version)),\r\n address(this),\r\n bytes32(getChainId())\r\n )\r\n );\r\n }\r\n\r\n function getDomainSeperator() public view returns (bytes32) {\r\n return domainSeperator;\r\n }\r\n\r\n function getChainId() public pure returns (uint256) {\r\n uint256 id;\r\n assembly {\r\n id := chainid()\r\n }\r\n return id;\r\n }\r\n\r\n /**\r\n * Accept message hash and returns hash message in EIP712 compatible form\r\n * So that it can be used to recover signer from signature signed using EIP712 formatted data\r\n * https://eips.ethereum.org/EIPS/eip-712\r\n * \"\\\\x19\" makes the encoding deterministic\r\n * \"\\\\x01\" is the version byte to make it compatible to EIP-191\r\n */\r\n function toTypedMessageHash(bytes32 messageHash)\r\n internal\r\n view\r\n returns (bytes32)\r\n {\r\n return\r\n keccak256(\r\n abi.encodePacked(\"\\x19\\x01\", getDomainSeperator(), messageHash)\r\n );\r\n }\r\n}\r\n\r\n// File: contracts/common/NativeMetaTransaction.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\n\r\n\r\ncontract NativeMetaTransaction is EIP712Base {\r\n using SafeMath for uint256;\r\n bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256(\r\n bytes(\r\n \"MetaTransaction(uint256 nonce,address from,bytes functionSignature)\"\r\n )\r\n );\r\n event MetaTransactionExecuted(\r\n address userAddress,\r\n address payable relayerAddress,\r\n bytes functionSignature\r\n );\r\n mapping(address => uint256) nonces;\r\n\r\n /*\r\n * Meta transaction structure.\r\n * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas\r\n * He should call the desired function directly in that case.\r\n */\r\n struct MetaTransaction {\r\n uint256 nonce;\r\n address from;\r\n bytes functionSignature;\r\n }\r\n\r\n function executeMetaTransaction(\r\n address userAddress,\r\n bytes memory functionSignature,\r\n bytes32 sigR,\r\n bytes32 sigS,\r\n uint8 sigV\r\n ) public payable returns (bytes memory) {\r\n MetaTransaction memory metaTx = MetaTransaction({\r\n nonce: nonces[userAddress],\r\n from: userAddress,\r\n functionSignature: functionSignature\r\n });\r\n\r\n require(\r\n verify(userAddress, metaTx, sigR, sigS, sigV),\r\n \"Signer and signature do not match\"\r\n );\r\n\r\n // increase nonce for user (to avoid re-use)\r\n nonces[userAddress] = nonces[userAddress].add(1);\r\n\r\n emit MetaTransactionExecuted(\r\n userAddress,\r\n msg.sender,\r\n functionSignature\r\n );\r\n\r\n // Append userAddress and relayer address at the end to extract it from calling context\r\n (bool success, bytes memory returnData) = address(this).call(\r\n abi.encodePacked(functionSignature, userAddress)\r\n );\r\n require(success, \"Function call not successful\");\r\n\r\n return returnData;\r\n }\r\n\r\n function hashMetaTransaction(MetaTransaction memory metaTx)\r\n internal\r\n pure\r\n returns (bytes32)\r\n {\r\n return\r\n keccak256(\r\n abi.encode(\r\n META_TRANSACTION_TYPEHASH,\r\n metaTx.nonce,\r\n metaTx.from,\r\n keccak256(metaTx.functionSignature)\r\n )\r\n );\r\n }\r\n\r\n function getNonce(address user) public view returns (uint256 nonce) {\r\n nonce = nonces[user];\r\n }\r\n\r\n function verify(\r\n address signer,\r\n MetaTransaction memory metaTx,\r\n bytes32 sigR,\r\n bytes32 sigS,\r\n uint8 sigV\r\n ) internal view returns (bool) {\r\n require(signer != address(0), \"NativeMetaTransaction: INVALID_SIGNER\");\r\n return\r\n signer ==\r\n ecrecover(\r\n toTypedMessageHash(hashMetaTransaction(metaTx)),\r\n sigV,\r\n sigR,\r\n sigS\r\n );\r\n }\r\n}\r\n\r\n// File: contracts/ChainConstants.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\ncontract ChainConstants {\r\n string constant public ERC712_VERSION = \"1\";\r\n\r\n uint256 constant public ROOT_CHAIN_ID = 1;\r\n bytes constant public ROOT_CHAIN_ID_BYTES = hex\"01\";\r\n\r\n uint256 constant public CHILD_CHAIN_ID = 137;\r\n bytes constant public CHILD_CHAIN_ID_BYTES = hex\"89\";\r\n}\r\n\r\n// File: contracts/common/ContextMixin.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\nabstract contract ContextMixin {\r\n function msgSender()\r\n internal\r\n view\r\n returns (address payable sender)\r\n {\r\n if (msg.sender == address(this)) {\r\n bytes memory array = msg.data;\r\n uint256 index = msg.data.length;\r\n assembly {\r\n // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.\r\n sender := and(\r\n mload(add(array, index)),\r\n 0xffffffffffffffffffffffffffffffffffffffff\r\n )\r\n }\r\n } else {\r\n sender = msg.sender;\r\n }\r\n return sender;\r\n }\r\n}\r\n\r\n// File: contracts/child/ChildToken/UpgradeableChildERC20/UChildERC20.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\ncontract UChildERC20 is\r\n ERC20,\r\n IChildToken,\r\n AccessControlMixin,\r\n NativeMetaTransaction,\r\n ChainConstants,\r\n ContextMixin\r\n{\r\n bytes32 public constant DEPOSITOR_ROLE = keccak256(\"DEPOSITOR_ROLE\");\r\n\r\n constructor() public ERC20(\"\", \"\") {}\r\n\r\n /**\r\n * @notice Initialize the contract after it has been proxified\r\n * @dev meant to be called once immediately after deployment\r\n */\r\n function initialize(\r\n string calldata name_,\r\n string calldata symbol_,\r\n uint8 decimals_,\r\n address childChainManager\r\n )\r\n external\r\n initializer\r\n {\r\n setName(name_);\r\n setSymbol(symbol_);\r\n setDecimals(decimals_);\r\n _setupContractId(string(abi.encodePacked(\"Child\", symbol_)));\r\n _setupRole(DEFAULT_ADMIN_ROLE, _msgSender());\r\n _setupRole(DEPOSITOR_ROLE, childChainManager);\r\n _initializeEIP712(name_, ERC712_VERSION);\r\n }\r\n\r\n // This is to support Native meta transactions\r\n // never use msg.sender directly, use _msgSender() instead\r\n function _msgSender()\r\n internal\r\n override\r\n view\r\n returns (address payable sender)\r\n {\r\n return ContextMixin.msgSender();\r\n }\r\n\r\n function changeName(string calldata name_) external only(DEFAULT_ADMIN_ROLE) {\r\n setName(name_);\r\n _setDomainSeperator(name_, ERC712_VERSION);\r\n }\r\n\r\n /**\r\n * @notice called when token is deposited on root chain\r\n * @dev Should be callable only by ChildChainManager\r\n * Should handle deposit by minting the required amount for user\r\n * Make sure minting is done only by this function\r\n * @param user user address for whom deposit is being done\r\n * @param depositData abi encoded amount\r\n */\r\n function deposit(address user, bytes calldata depositData)\r\n external\r\n override\r\n only(DEPOSITOR_ROLE)\r\n {\r\n uint256 amount = abi.decode(depositData, (uint256));\r\n _mint(user, amount);\r\n }\r\n\r\n /**\r\n * @notice called when user wants to withdraw tokens back to root chain\r\n * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain\r\n * @param amount amount of tokens to withdraw\r\n */\r\n function withdraw(uint256 amount) external {\r\n _burn(_msgSender(), amount);\r\n }\r\n}\r\n\r\n// File: contracts/child/ChildToken/DappTokens/UChildDAI.sol\r\n\r\npragma solidity 0.6.6;\r\n\r\n\r\ncontract UChildDAI is UChildERC20 {\r\n // bytes32 public constant PERMIT_TYPEHASH = keccak256(\"Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)\");\r\n bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;\r\n\r\n // --- Alias ---\r\n function push(address usr, uint wad) external {\r\n transferFrom(msg.sender, usr, wad);\r\n }\r\n function pull(address usr, uint wad) external {\r\n transferFrom(usr, msg.sender, wad);\r\n }\r\n function move(address src, address dst, uint wad) external {\r\n transferFrom(src, dst, wad);\r\n }\r\n\r\n // --- Approve by signature ---\r\n function permit(\r\n address holder,\r\n address spender,\r\n uint256 nonce,\r\n uint256 expiry,\r\n bool allowed,\r\n uint8 v,\r\n bytes32 r,\r\n bytes32 s\r\n ) external {\r\n bytes32 digest = keccak256(\r\n abi.encodePacked(\r\n \"\\x19\\x01\",\r\n getDomainSeperator(),\r\n keccak256(\r\n abi.encode(\r\n PERMIT_TYPEHASH,\r\n holder,\r\n spender,\r\n nonce,\r\n expiry,\r\n allowed\r\n )\r\n )\r\n ));\r\n\r\n require(holder == ecrecover(digest, v, r, s), \"UChildDAI: INVALID-PERMIT\");\r\n require(expiry == 0 || now <= expiry, \"UChildDAI: PERMIT-EXPIRED\");\r\n require(nonce == nonces[holder]++, \"UChildDAI: INVALID-NONCE\");\r\n uint wad = allowed ? uint(-1) : 0;\r\n _approve(holder, spender, wad);\r\n }\r\n}"}},"matchId":"5195332","creationMatch":"match","runtimeMatch":"match","verifiedAt":"2024-08-23T11:50:04Z","match":"match","chainId":"137","address":"0x490e379C9cFF64944bE82b849F8FD5972C7999A7"}