ERC-20
Overview
Max Total Supply
0.72 ERC20 ***
Holders
7
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 8 Decimals)
Balance
0.04000009 ERC20 ***Value
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0x7087ef6878a4557b86e8140de664bf82f75d38ee
Contract Name:
Otoken
Compiler Version
v0.6.10+commit.00c0fcaf
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/* SPDX-License-Identifier: UNLICENSED */ pragma solidity =0.6.10; import {ERC20Initializable} from "./packages/oz/upgradeability/ERC20Initializable.sol"; import {SafeMath} from "./packages/oz/SafeMath.sol"; import {Strings} from "./packages/oz/Strings.sol"; import {BokkyPooBahsDateTimeLibrary} from "./packages/BokkyPooBahsDateTimeLibrary.sol"; import {AddressBookInterface} from "./interfaces/AddressBookInterface.sol"; /** * @title Otoken * @author Opyn Team * @notice Otoken is the ERC20 token for an option * @dev The Otoken inherits ERC20Initializable because we need to use the init instead of constructor */ contract Otoken is ERC20Initializable { using SafeMath for uint256; /// @notice address of the AddressBook module address public addressBook; /// @notice asset that the option references address public underlyingAsset; /// @notice asset that the strike price is denominated in address public strikeAsset; /// @notice asset that is held as collateral against short/written options address public collateralAsset; /// @notice strike price with decimals = 8 uint256 public strikePrice; /// @notice expiration timestamp of the option, represented as a unix timestamp uint256 public expiryTimestamp; /// @notice True if a put option, False if a call option bool public isPut; uint256 private constant STRIKE_PRICE_SCALE = 1e8; uint256 private constant STRIKE_PRICE_DIGITS = 8; /** * @notice initialize the oToken * @param _underlyingAsset asset that the option references * @param _strikeAsset asset that the strike price is denominated in * @param _collateralAsset asset that is held as collateral against short/written options * @param _strikePrice strike price with decimals = 8 * @param _expiryTimestamp expiration timestamp of the option, represented as a unix timestamp * @param _isPut True if a put option, False if a call option */ function init( address _addressBook, address _underlyingAsset, address _strikeAsset, address _collateralAsset, uint256 _strikePrice, uint256 _expiryTimestamp, bool _isPut ) external initializer { addressBook = _addressBook; underlyingAsset = _underlyingAsset; strikeAsset = _strikeAsset; collateralAsset = _collateralAsset; strikePrice = _strikePrice; expiryTimestamp = _expiryTimestamp; isPut = _isPut; (string memory tokenName, string memory tokenSymbol) = _getNameAndSymbol(); __ERC20_init_unchained(tokenName, tokenSymbol); _setupDecimals(8); } /** * @notice mint oToken for an account * @dev Controller only method where access control is taken care of by _beforeTokenTransfer hook * @param account account to mint token to * @param amount amount to mint */ function mintOtoken(address account, uint256 amount) external { require( msg.sender == AddressBookInterface(addressBook).getController(), "Otoken: Only Controller can mint Otokens" ); _mint(account, amount); } /** * @notice burn oToken from an account. * @dev Controller only method where access control is taken care of by _beforeTokenTransfer hook * @param account account to burn token from * @param amount amount to burn */ function burnOtoken(address account, uint256 amount) external { require( msg.sender == AddressBookInterface(addressBook).getController(), "Otoken: Only Controller can burn Otokens" ); _burn(account, amount); } /** * @notice generates the name and symbol for an option * @dev this function uses a named return variable to avoid the stack-too-deep error * @return tokenName (ex: ETHUSDC 05-September-2020 200 Put USDC Collateral) * @return tokenSymbol (ex: oETHUSDC-05SEP20-200P) */ function _getNameAndSymbol() internal view returns (string memory tokenName, string memory tokenSymbol) { string memory underlying = ERC20Initializable(underlyingAsset).symbol(); string memory strike = ERC20Initializable(strikeAsset).symbol(); string memory collateral = ERC20Initializable(collateralAsset).symbol(); string memory displayStrikePrice = _getDisplayedStrikePrice(strikePrice); // convert expiry to a readable string (uint256 year, uint256 month, uint256 day) = BokkyPooBahsDateTimeLibrary.timestampToDate(expiryTimestamp); // get option type string (string memory typeSymbol, string memory typeFull) = _getOptionType(isPut); //get option month string (string memory monthSymbol, string memory monthFull) = _getMonth(month); // concatenated name string: ETHUSDC 05-September-2020 200 Put USDC Collateral tokenName = string( abi.encodePacked( underlying, strike, " ", _uintTo2Chars(day), "-", monthFull, "-", Strings.toString(year), " ", displayStrikePrice, typeFull, " ", collateral, " Collateral" ) ); // concatenated symbol string: oETHUSDC/USDC-05SEP20-200P tokenSymbol = string( abi.encodePacked( "o", underlying, strike, "/", collateral, "-", _uintTo2Chars(day), monthSymbol, _uintTo2Chars(year), "-", displayStrikePrice, typeSymbol ) ); } /** * @dev convert strike price scaled by 1e8 to human readable number string * @param _strikePrice strike price scaled by 1e8 * @return strike price string */ function _getDisplayedStrikePrice(uint256 _strikePrice) internal pure returns (string memory) { uint256 remainder = _strikePrice.mod(STRIKE_PRICE_SCALE); uint256 quotient = _strikePrice.div(STRIKE_PRICE_SCALE); string memory quotientStr = Strings.toString(quotient); if (remainder == 0) return quotientStr; uint256 trailingZeroes = 0; while (remainder.mod(10) == 0) { remainder = remainder / 10; trailingZeroes += 1; } // pad the number with "1 + starting zeroes" remainder += 10**(STRIKE_PRICE_DIGITS - trailingZeroes); string memory tmpStr = Strings.toString(remainder); tmpStr = _slice(tmpStr, 1, 1 + STRIKE_PRICE_DIGITS - trailingZeroes); string memory completeStr = string(abi.encodePacked(quotientStr, ".", tmpStr)); return completeStr; } /** * @dev return a representation of a number using 2 characters, adds a leading 0 if one digit, uses two trailing digits if a 3 digit number * @return 2 characters that corresponds to a number */ function _uintTo2Chars(uint256 number) internal pure returns (string memory) { if (number > 99) number = number % 100; string memory str = Strings.toString(number); if (number < 10) { return string(abi.encodePacked("0", str)); } return str; } /** * @dev return string representation of option type * @return shortString a 1 character representation of option type (P or C) * @return longString a full length string of option type (Put or Call) */ function _getOptionType(bool _isPut) internal pure returns (string memory shortString, string memory longString) { if (_isPut) { return ("P", "Put"); } else { return ("C", "Call"); } } /** * @dev cut string s into s[start:end] * @param _s the string to cut * @param _start the starting index * @param _end the ending index (excluded in the substring) */ function _slice( string memory _s, uint256 _start, uint256 _end ) internal pure returns (string memory) { bytes memory a = new bytes(_end - _start); for (uint256 i = 0; i < _end - _start; i++) { a[i] = bytes(_s)[_start + i]; } return string(a); } /** * @dev return string representation of a month * @return shortString a 3 character representation of a month (ex: SEP, DEC, etc) * @return longString a full length string of a month (ex: September, December, etc) */ function _getMonth(uint256 _month) internal pure returns (string memory shortString, string memory longString) { if (_month == 1) { return ("JAN", "January"); } else if (_month == 2) { return ("FEB", "February"); } else if (_month == 3) { return ("MAR", "March"); } else if (_month == 4) { return ("APR", "April"); } else if (_month == 5) { return ("MAY", "May"); } else if (_month == 6) { return ("JUN", "June"); } else if (_month == 7) { return ("JUL", "July"); } else if (_month == 8) { return ("AUG", "August"); } else if (_month == 9) { return ("SEP", "September"); } else if (_month == 10) { return ("OCT", "October"); } else if (_month == 11) { return ("NOV", "November"); } else { return ("DEC", "December"); } } }
// SPDX-License-Identifier: UNLICENSED pragma solidity 0.6.10; interface AddressBookInterface { /* Getters */ function getOtokenImpl() external view returns (address); function getOtokenFactory() external view returns (address); function getWhitelist() external view returns (address); function getController() external view returns (address); function getOracle() external view returns (address); function getMarginPool() external view returns (address); function getMarginCalculator() external view returns (address); function getLiquidationManager() external view returns (address); function getAddress(bytes32 _id) external view returns (address); /* Setters */ function setOtokenImpl(address _otokenImpl) external; function setOtokenFactory(address _factory) external; function setOracleImpl(address _otokenImpl) external; function setWhitelist(address _whitelist) external; function setController(address _controller) external; function setMarginPool(address _marginPool) external; function setMarginCalculator(address _calculator) external; function setLiquidationManager(address _liquidationManager) external; function setAddress(bytes32 _id, address _newImpl) external; }
// SPDX-License-Identifier: MIT // solhint-disable pragma solidity ^0.6.0; // ---------------------------------------------------------------------------- // BokkyPooBah's DateTime Library v1.01 // // A gas-efficient Solidity date and time library // // https://github.com/bokkypoobah/BokkyPooBahsDateTimeLibrary // // Tested date range 1970/01/01 to 2345/12/31 // // Conventions: // Unit | Range | Notes // :-------- |:-------------:|:----- // timestamp | >= 0 | Unix timestamp, number of seconds since 1970/01/01 00:00:00 UTC // year | 1970 ... 2345 | // month | 1 ... 12 | // day | 1 ... 31 | // hour | 0 ... 23 | // minute | 0 ... 59 | // second | 0 ... 59 | // dayOfWeek | 1 ... 7 | 1 = Monday, ..., 7 = Sunday // // // Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd 2018-2019. The MIT Licence. // ---------------------------------------------------------------------------- library BokkyPooBahsDateTimeLibrary { uint256 constant SECONDS_PER_DAY = 24 * 60 * 60; int256 constant OFFSET19700101 = 2440588; // ------------------------------------------------------------------------ // Calculate year/month/day from the number of days since 1970/01/01 using // the date conversion algorithm from // http://aa.usno.navy.mil/faq/docs/JD_Formula.php // and adding the offset 2440588 so that 1970/01/01 is day 0 // // int L = days + 68569 + offset // int N = 4 * L / 146097 // L = L - (146097 * N + 3) / 4 // year = 4000 * (L + 1) / 1461001 // L = L - 1461 * year / 4 + 31 // month = 80 * L / 2447 // dd = L - 2447 * month / 80 // L = month / 11 // month = month + 2 - 12 * L // year = 100 * (N - 49) + year + L // ------------------------------------------------------------------------ function _daysToDate(uint256 _days) internal pure returns ( uint256 year, uint256 month, uint256 day ) { int256 __days = int256(_days); int256 L = __days + 68569 + OFFSET19700101; int256 N = (4 * L) / 146097; L = L - (146097 * N + 3) / 4; int256 _year = (4000 * (L + 1)) / 1461001; L = L - (1461 * _year) / 4 + 31; int256 _month = (80 * L) / 2447; int256 _day = L - (2447 * _month) / 80; L = _month / 11; _month = _month + 2 - 12 * L; _year = 100 * (N - 49) + _year + L; year = uint256(_year); month = uint256(_month); day = uint256(_day); } function timestampToDate(uint256 timestamp) internal pure returns ( uint256 year, uint256 month, uint256 day ) { (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.2; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return _functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue( address target, bytes memory data, uint256 weiValue, string memory errorMessage ) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{value: weiValue}(data); if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity ^0.6.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity ^0.6.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod( uint256 a, uint256 b, string memory errorMessage ) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity =0.6.10; /** * @dev String operations. */ library Strings { /** * @dev Converts a `uint256` to its ASCII `string` representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); uint256 index = digits - 1; temp = value; while (temp != 0) { buffer[index--] = bytes1(uint8(48 + (temp % 10))); temp /= 10; } return string(buffer); } }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity ^0.6.0; import "./Initializable.sol"; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract ContextUpgradeSafe is Initializable { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. function __Context_init() internal initializer { __Context_init_unchained(); } function __Context_init_unchained() internal initializer {} function _msgSender() internal virtual view returns (address payable) { return msg.sender; } function _msgData() internal virtual view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity ^0.6.0; import "./ContextUpgradeSafe.sol"; import "../IERC20.sol"; import "../SafeMath.sol"; import "../Address.sol"; import "./Initializable.sol"; /** * @dev Implementation of the {IERC20} interface. * @notice this contract was renamed from ERC20UpgradeSafe to ERC20Initializable * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20MinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20Initializable is Initializable, ContextUpgradeSafe, IERC20 { using SafeMath for uint256; using Address for address; mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ function __ERC20_init(string memory name, string memory symbol) internal initializer { __Context_init_unchained(); __ERC20_init_unchained(name, symbol); } function __ERC20_init_unchained(string memory name, string memory symbol) internal initializer { _name = name; _symbol = symbol; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev 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}. */ function decimals() public view returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public override view returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public override view returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public virtual override view returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev 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`. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount); _approve( sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance") ); return true; } /** * @dev 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. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev 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`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve( _msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero") ); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. * * This is internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} uint256[44] private __gap; }
// SPDX-License-Identifier: MIT /* solhint-disable */ pragma solidity >=0.4.24 <0.7.0; /** * @title Initializable * * @dev Helper contract to support initializer functions. To use it, replace * the constructor with a function that has the `initializer` modifier. * WARNING: Unlike constructors, initializer functions must be manually * invoked. This applies both to deploying an Initializable contract, as well * as extending an Initializable contract via inheritance. * WARNING: When used with inheritance, manual care must be taken to not invoke * a parent initializer twice, or ensure that all initializers are idempotent, * because this is not dealt with automatically as with constructors. */ contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private initializing; /** * @dev Modifier to use in the initializer function of a contract. */ modifier initializer() { require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized"); bool isTopLevelCall = !initializing; if (isTopLevelCall) { initializing = true; initialized = true; } _; if (isTopLevelCall) { initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function isConstructor() private view returns (bool) { // extcodesize checks the size of the code stored in an address, and // address returns the current address. Since the code is still not // deployed when running a constructor, any checks on its code size will // yield zero, making it an effective way to detect if a contract is // under construction or not. address self = address(this); uint256 cs; assembly { cs := extcodesize(self) } return cs == 0; } // Reserved storage space to allow for layout changes in the future. uint256[50] private ______gap; }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 200 }, "evmVersion": "istanbul", "libraries": { "": {} }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.