ERC-20
Overview
Max Total Supply
4,837.37097539643772983 bWAMPL
Holders
23
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xab4691ad011adb810610e9610a74be77c553e9f9
Contract Name:
ButtonToken
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity 0.8.4; import {IOracle} from "./interfaces/IOracle.sol"; import "./interfaces/IButtonToken.sol"; import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol"; import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol"; /** * @title The ButtonToken ERC20 wrapper. * * @dev The ButtonToken is a rebasing wrapper for fixed balance ERC-20 tokens. * * Users deposit the "underlying" (wrapped) tokens and are * minted button (wrapper) tokens with elastic balances * which change up or down when the value of the underlying token changes. * * For example: Manny “wraps” 1 Ether when the price of Ether is $1800. * Manny receives 1800 ButtonEther tokens in return. * The overall value of their ButtonEther is the same as their original Ether, * however each unit is now priced at exactly $1. The next day, * the price of Ether changes to $1900. The ButtonEther system detects * this price change, and rebases such that Manny’s balance is * now 1900 ButtonEther tokens, still priced at $1 each. * * The ButtonToken math is almost identical to Ampleforth's μFragments. * * For AMPL, internal balances are represented using `gons` and * -> internal account balance `_gonBalances[account]` * -> internal supply scalar `gonsPerFragment = TOTAL_GONS / _totalSupply` * -> public balance `_gonBalances[account] * gonsPerFragment` * -> public total supply `_totalSupply` * * In our case internal balances are stored as 'bits'. * -> underlying token unit price `p_u = price / 10 ^ (PRICE_DECIMALS)` * -> total underlying tokens `_totalUnderlying` * -> internal account balance `_accountBits[account]` * -> internal supply scalar `_bitsPerToken` ` = TOTAL_BITS / (MAX_UNDERLYING*p_u)` * ` = BITS_PER_UNDERLYING*(10^PRICE_DECIMALS)/price` * ` = PRICE_BITS / price` * -> user's underlying balance `(_accountBits[account] / BITS_PER_UNDERLYING` * -> public balance `_accountBits[account] * _bitsPerToken` * -> public total supply `_totalUnderlying * p_u` * * */ contract ButtonToken is IButtonToken, Initializable, OwnableUpgradeable { // PLEASE READ BEFORE CHANGING ANY ACCOUNTING OR MATH // We make the following guarantees: // - If address 'A' transfers x button tokens to address 'B'. // A's resulting external balance will be decreased by "precisely" x button tokens, // and B's external balance will be "precisely" increased by x button tokens. // - If address 'A' deposits y underlying tokens, // A's resulting underlying balance will increase by "precisely" y. // - If address 'A' withdraws y underlying tokens, // A's resulting underlying balance will decrease by "precisely" y. // using SafeERC20 for IERC20; //-------------------------------------------------------------------------- // Constants /// @dev The price has a 8 decimal point precision. uint256 public constant PRICE_DECIMALS = 8; /// @dev Math constants. uint256 private constant MAX_UINT256 = type(uint256).max; /// @dev The maximum units of the underlying token that can be deposited into this contract /// ie) for a underlying token with 18 decimals, MAX_UNDERLYING is 1B tokens. uint256 public constant MAX_UNDERLYING = 1_000_000_000e18; /// @dev TOTAL_BITS is a multiple of MAX_UNDERLYING so that {BITS_PER_UNDERLYING} is an integer. /// Use the highest value that fits in a uint256 for max granularity. uint256 private constant TOTAL_BITS = MAX_UINT256 - (MAX_UINT256 % MAX_UNDERLYING); /// @dev Number of BITS per unit of deposit. uint256 private constant BITS_PER_UNDERLYING = TOTAL_BITS / MAX_UNDERLYING; /// @dev Number of BITS per unit of deposit * (1 USD). uint256 private constant PRICE_BITS = BITS_PER_UNDERLYING * (10**PRICE_DECIMALS); /// @dev TRUE_MAX_PRICE = maximum integer < (sqrt(4*PRICE_BITS + 1) - 1) / 2 /// Setting MAX_PRICE to the closest two power which is just under TRUE_MAX_PRICE. uint256 public constant MAX_PRICE = (2**96 - 1); // (2^96) - 1 //-------------------------------------------------------------------------- // Attributes /// @inheritdoc IButtonWrapper address public override underlying; /// @inheritdoc IButtonToken address public override oracle; /// @inheritdoc IButtonToken uint256 public override lastPrice; /// @dev Rebase counter uint256 _epoch; /// @inheritdoc IERC20Metadata string public override name; /// @inheritdoc IERC20Metadata string public override symbol; /// @dev internal balance, bits issued per account mapping(address => uint256) private _accountBits; /// @dev ERC20 allowances mapping(address => mapping(address => uint256)) private _allowances; //-------------------------------------------------------------------------- // Modifiers modifier validRecipient(address to) { require(to != address(0x0), "ButtonToken: recipient zero address"); require(to != address(this), "ButtonToken: recipient token address"); _; } modifier onAfterRebase() { uint256 price; bool valid; (price, valid) = _queryPrice(); if (valid) { _rebase(price); } _; } //-------------------------------------------------------------------------- /// @param underlying_ The underlying ERC20 token address. /// @param name_ The ERC20 name. /// @param symbol_ The ERC20 symbol. /// @param oracle_ The oracle which provides the underlying token price. function initialize( address underlying_, string memory name_, string memory symbol_, address oracle_ ) public override initializer { require(underlying_ != address(0), "ButtonToken: invalid underlying reference"); // Initializing ownership to `msg.sender` __Ownable_init(); underlying = underlying_; name = name_; symbol = symbol_; // MAX_UNDERLYING worth bits are 'pre-mined' to `address(0x)` // at the time of construction. // // During mint, bits are transferred from `address(0x)` // and during burn, bits are transferred back to `address(0x)`. // // No more than MAX_UNDERLYING can be deposited into the ButtonToken contract. _accountBits[address(0)] = TOTAL_BITS; updateOracle(oracle_); } //-------------------------------------------------------------------------- // Owner only actions /// @inheritdoc IButtonToken function updateOracle(address oracle_) public override onlyOwner { uint256 price; bool valid; oracle = oracle_; (price, valid) = _queryPrice(); require(valid, "ButtonToken: unable to fetch data from oracle"); emit OracleUpdated(oracle); _rebase(price); } //-------------------------------------------------------------------------- // ERC20 description attributes /// @inheritdoc IERC20Metadata function decimals() external view override returns (uint8) { return IERC20Metadata(underlying).decimals(); } //-------------------------------------------------------------------------- // ERC-20 token view methods /// @inheritdoc IERC20 function totalSupply() external view override returns (uint256) { uint256 price; (price, ) = _queryPrice(); return _bitsToAmount(_activeBits(), price); } /// @inheritdoc IERC20 function balanceOf(address account) external view override returns (uint256) { if (account == address(0)) { return 0; } uint256 price; (price, ) = _queryPrice(); return _bitsToAmount(_accountBits[account], price); } /// @inheritdoc IRebasingERC20 function scaledTotalSupply() external view override returns (uint256) { return _bitsToUAmount(_activeBits()); } /// @inheritdoc IRebasingERC20 function scaledBalanceOf(address account) external view override returns (uint256) { if (account == address(0)) { return 0; } return _bitsToUAmount(_accountBits[account]); } /// @inheritdoc IERC20 function allowance(address owner_, address spender) external view override returns (uint256) { return _allowances[owner_][spender]; } //-------------------------------------------------------------------------- // ButtonWrapper view methods /// @inheritdoc IButtonWrapper function totalUnderlying() external view override returns (uint256) { return _bitsToUAmount(_activeBits()); } /// @inheritdoc IButtonWrapper function balanceOfUnderlying(address who) external view override returns (uint256) { if (who == address(0)) { return 0; } return _bitsToUAmount(_accountBits[who]); } /// @inheritdoc IButtonWrapper function underlyingToWrapper(uint256 uAmount) external view override returns (uint256) { uint256 price; (price, ) = _queryPrice(); return _bitsToAmount(_uAmountToBits(uAmount), price); } /// @inheritdoc IButtonWrapper function wrapperToUnderlying(uint256 amount) external view override returns (uint256) { uint256 price; (price, ) = _queryPrice(); return _bitsToUAmount(_amountToBits(amount, price)); } //-------------------------------------------------------------------------- // ERC-20 write methods /// @inheritdoc IERC20 function transfer(address to, uint256 amount) external override validRecipient(to) onAfterRebase returns (bool) { _transfer(_msgSender(), to, _amountToBits(amount, lastPrice), amount); return true; } /// @inheritdoc IRebasingERC20 function transferAll(address to) external override validRecipient(to) onAfterRebase returns (bool) { uint256 bits = _accountBits[_msgSender()]; _transfer(_msgSender(), to, bits, _bitsToAmount(bits, lastPrice)); return true; } /// @inheritdoc IERC20 function transferFrom( address from, address to, uint256 amount ) external override validRecipient(to) onAfterRebase returns (bool) { if (_allowances[from][_msgSender()] != type(uint256).max) { _allowances[from][_msgSender()] -= amount; emit Approval(from, _msgSender(), _allowances[from][_msgSender()]); } _transfer(from, to, _amountToBits(amount, lastPrice), amount); return true; } /// @inheritdoc IRebasingERC20 function transferAllFrom(address from, address to) external override validRecipient(to) onAfterRebase returns (bool) { uint256 bits = _accountBits[from]; uint256 amount = _bitsToAmount(bits, lastPrice); if (_allowances[from][_msgSender()] != type(uint256).max) { _allowances[from][_msgSender()] -= amount; emit Approval(from, _msgSender(), _allowances[from][_msgSender()]); } _transfer(from, to, bits, amount); return true; } /// @inheritdoc IERC20 function approve(address spender, uint256 amount) external override returns (bool) { _allowances[_msgSender()][spender] = amount; emit Approval(_msgSender(), spender, amount); return true; } // @inheritdoc IERC20 function increaseAllowance(address spender, uint256 addedAmount) external returns (bool) { _allowances[_msgSender()][spender] += addedAmount; emit Approval(_msgSender(), spender, _allowances[_msgSender()][spender]); return true; } // @inheritdoc IERC20 function decreaseAllowance(address spender, uint256 subtractedAmount) external returns (bool) { if (subtractedAmount >= _allowances[_msgSender()][spender]) { delete _allowances[_msgSender()][spender]; } else { _allowances[_msgSender()][spender] -= subtractedAmount; } emit Approval(_msgSender(), spender, _allowances[_msgSender()][spender]); return true; } //-------------------------------------------------------------------------- // RebasingERC20 write methods /// @inheritdoc IRebasingERC20 function rebase() external override onAfterRebase { return; } //-------------------------------------------------------------------------- // ButtonWrapper write methods /// @inheritdoc IButtonWrapper function mint(uint256 amount) external override onAfterRebase returns (uint256) { uint256 bits = _amountToBits(amount, lastPrice); uint256 uAmount = _bitsToUAmount(bits); _deposit(_msgSender(), _msgSender(), uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function mintFor(address to, uint256 amount) external override onAfterRebase returns (uint256) { uint256 bits = _amountToBits(amount, lastPrice); uint256 uAmount = _bitsToUAmount(bits); _deposit(_msgSender(), to, uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function burn(uint256 amount) external override onAfterRebase returns (uint256) { uint256 bits = _amountToBits(amount, lastPrice); uint256 uAmount = _bitsToUAmount(bits); _withdraw(_msgSender(), _msgSender(), uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function burnTo(address to, uint256 amount) external override onAfterRebase returns (uint256) { uint256 bits = _amountToBits(amount, lastPrice); uint256 uAmount = _bitsToUAmount(bits); _withdraw(_msgSender(), to, uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function burnAll() external override onAfterRebase returns (uint256) { uint256 bits = _accountBits[_msgSender()]; uint256 uAmount = _bitsToUAmount(bits); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), _msgSender(), uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function burnAllTo(address to) external override onAfterRebase returns (uint256) { uint256 bits = _accountBits[_msgSender()]; uint256 uAmount = _bitsToUAmount(bits); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), to, uAmount, amount, bits); return uAmount; } /// @inheritdoc IButtonWrapper function deposit(uint256 uAmount) external override onAfterRebase returns (uint256) { uint256 bits = _uAmountToBits(uAmount); uint256 amount = _bitsToAmount(bits, lastPrice); _deposit(_msgSender(), _msgSender(), uAmount, amount, bits); return amount; } /// @inheritdoc IButtonWrapper function depositFor(address to, uint256 uAmount) external override onAfterRebase returns (uint256) { uint256 bits = _uAmountToBits(uAmount); uint256 amount = _bitsToAmount(bits, lastPrice); _deposit(_msgSender(), to, uAmount, amount, bits); return amount; } /// @inheritdoc IButtonWrapper function withdraw(uint256 uAmount) external override onAfterRebase returns (uint256) { uint256 bits = _uAmountToBits(uAmount); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), _msgSender(), uAmount, amount, bits); return amount; } /// @inheritdoc IButtonWrapper function withdrawTo(address to, uint256 uAmount) external override onAfterRebase returns (uint256) { uint256 bits = _uAmountToBits(uAmount); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), to, uAmount, amount, bits); return amount; } /// @inheritdoc IButtonWrapper function withdrawAll() external override onAfterRebase returns (uint256) { uint256 bits = _accountBits[_msgSender()]; uint256 uAmount = _bitsToUAmount(bits); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), _msgSender(), uAmount, amount, bits); return amount; } /// @inheritdoc IButtonWrapper function withdrawAllTo(address to) external override onAfterRebase returns (uint256) { uint256 bits = _accountBits[_msgSender()]; uint256 uAmount = _bitsToUAmount(bits); uint256 amount = _bitsToAmount(bits, lastPrice); _withdraw(_msgSender(), to, uAmount, amount, bits); return amount; } //-------------------------------------------------------------------------- // Private methods /// @dev Internal method to commit deposit state. /// NOTE: Expects bits, uAmount, amount to be pre-calculated. function _deposit( address from, address to, uint256 uAmount, uint256 amount, uint256 bits ) private { require(amount > 0, "ButtonToken: too few button tokens to mint"); IERC20(underlying).safeTransferFrom(from, address(this), uAmount); _transfer(address(0), to, bits, amount); } /// @dev Internal method to commit withdraw state. /// NOTE: Expects bits, uAmount, amount to be pre-calculated. function _withdraw( address from, address to, uint256 uAmount, uint256 amount, uint256 bits ) private { require(amount > 0, "ButtonToken: too few button tokens to burn"); _transfer(from, address(0), bits, amount); IERC20(underlying).safeTransfer(to, uAmount); } /// @dev Internal method to commit transfer state. /// NOTE: Expects bits/amounts to be pre-calculated. function _transfer( address from, address to, uint256 bits, uint256 amount ) private { _accountBits[from] -= bits; _accountBits[to] += bits; emit Transfer(from, to, amount); if (_accountBits[from] == 0) { delete _accountBits[from]; } } /// @dev Updates the `lastPrice` and recomputes the internal scalar. function _rebase(uint256 price) private { if (price > MAX_PRICE) { price = MAX_PRICE; } lastPrice = price; _epoch++; emit Rebase(_epoch, price); } /// @dev Returns the active "un-mined" bits function _activeBits() private view returns (uint256) { return TOTAL_BITS - _accountBits[address(0)]; } /// @dev Queries the oracle for the latest price /// If fetched oracle price isn't valid returns the last price, /// else returns the new price from the oracle. function _queryPrice() private view returns (uint256, bool) { uint256 newPrice; bool valid; (newPrice, valid) = IOracle(oracle).getData(); // Note: we consider newPrice == 0 to be invalid because accounting fails with price == 0 // For example, _bitsPerToken needs to be able to divide by price so a div/0 is caused return (valid && newPrice > 0 ? newPrice : lastPrice, valid && newPrice > 0); } /// @dev Convert button token amount to bits. function _amountToBits(uint256 amount, uint256 price) private pure returns (uint256) { return amount * _bitsPerToken(price); } /// @dev Convert underlying token amount to bits. function _uAmountToBits(uint256 uAmount) private pure returns (uint256) { return uAmount * BITS_PER_UNDERLYING; } /// @dev Convert bits to button token amount. function _bitsToAmount(uint256 bits, uint256 price) private pure returns (uint256) { return bits / _bitsPerToken(price); } /// @dev Convert bits to underlying token amount. function _bitsToUAmount(uint256 bits) private pure returns (uint256) { return bits / BITS_PER_UNDERLYING; } /// @dev Internal scalar to convert bits to button tokens. function _bitsPerToken(uint256 price) private pure returns (uint256) { return PRICE_BITS / price; } }
// SPDX-License-Identifier: GPL-3.0-or-later interface IOracle { function getData() external view returns (uint256, bool); }
// SPDX-License-Identifier: GPL-3.0-or-later import "./IRebasingERC20.sol"; import "./IButtonWrapper.sol"; // Interface definition for the ButtonToken ERC20 wrapper contract interface IButtonToken is IButtonWrapper, IRebasingERC20 { /// @dev The reference to the oracle which feeds in the /// price of the underlying token. function oracle() external view returns (address); /// @dev Most recent price recorded from the oracle. function lastPrice() external view returns (uint256); /// @dev Update reference to the oracle contract and resets price. /// @param oracle_ The address of the new oracle. function updateOracle(address oracle_) external; /// @dev Log to record changes to the oracle. /// @param oracle The address of the new oracle. event OracleUpdated(address oracle); /// @dev Contract initializer function initialize( address underlying_, string memory name_, string memory symbol_, address oracle_ ) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/ContextUpgradeable.sol"; import "../proxy/utils/Initializable.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function __Ownable_init() internal initializer { __Context_init_unchained(); __Ownable_init_unchained(); } function __Ownable_init_unchained() internal initializer { _setOwner(_msgSender()); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } uint256[49] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. */ abstract 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 protect an initializer function from being invoked twice. */ modifier initializer() { require(_initializing || !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } }
// SPDX-License-Identifier: GPL-3.0-or-later import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; // Interface definition for Rebasing ERC20 tokens which have a "elastic" external // balance and "fixed" internal balance. Each user's external balance is // represented as a product of a "scalar" and the user's internal balance. // // From time to time the "Rebase" event updates scaler, // which increases/decreases all user balances proportionally. // // The standard ERC-20 methods are denominated in the elastic balance // interface IRebasingERC20 is IERC20, IERC20Metadata { /// @notice Returns the fixed balance of the specified address. /// @param who The address to query. function scaledBalanceOf(address who) external view returns (uint256); /// @notice Returns the total fixed supply. function scaledTotalSupply() external view returns (uint256); /// @notice Transfer all of the sender's balance to a specified address. /// @param to The address to transfer to. /// @return True on success, false otherwise. function transferAll(address to) external returns (bool); /// @notice Transfer all balance tokens from one address to another. /// @param from The address to send tokens from. /// @param to The address to transfer to. function transferAllFrom(address from, address to) external returns (bool); /// @notice Triggers the next rebase, if applicable. function rebase() external; /// @notice Event emitted when the balance scalar is updated. /// @param epoch The number of rebases since inception. /// @param newScalar The new scalar. event Rebase(uint256 indexed epoch, uint256 newScalar); }
// SPDX-License-Identifier: GPL-3.0-or-later // Interface definition for ButtonWrapper contract, which wraps an // underlying ERC20 token into a new ERC20 with different characteristics. // NOTE: "uAmount" => underlying token (wrapped) amount and // "amount" => wrapper token amount interface IButtonWrapper { //-------------------------------------------------------------------------- // ButtonWrapper write methods /// @notice Transfers underlying tokens from {msg.sender} to the contract and /// mints wrapper tokens. /// @param amount The amount of wrapper tokens to mint. /// @return The amount of underlying tokens deposited. function mint(uint256 amount) external returns (uint256); /// @notice Transfers underlying tokens from {msg.sender} to the contract and /// mints wrapper tokens to the specified beneficiary. /// @param to The beneficiary account. /// @param amount The amount of wrapper tokens to mint. /// @return The amount of underlying tokens deposited. function mintFor(address to, uint256 amount) external returns (uint256); /// @notice Burns wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @param amount The amount of wrapper tokens to burn. /// @return The amount of underlying tokens withdrawn. function burn(uint256 amount) external returns (uint256); /// @notice Burns wrapper tokens from {msg.sender} and transfers /// the underlying tokens to the specified beneficiary. /// @param to The beneficiary account. /// @param amount The amount of wrapper tokens to burn. /// @return The amount of underlying tokens withdrawn. function burnTo(address to, uint256 amount) external returns (uint256); /// @notice Burns all wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @return The amount of underlying tokens withdrawn. function burnAll() external returns (uint256); /// @notice Burns all wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @param to The beneficiary account. /// @return The amount of underlying tokens withdrawn. function burnAllTo(address to) external returns (uint256); /// @notice Transfers underlying tokens from {msg.sender} to the contract and /// mints wrapper tokens to the specified beneficiary. /// @param uAmount The amount of underlying tokens to deposit. /// @return The amount of wrapper tokens mint. function deposit(uint256 uAmount) external returns (uint256); /// @notice Transfers underlying tokens from {msg.sender} to the contract and /// mints wrapper tokens to the specified beneficiary. /// @param to The beneficiary account. /// @param uAmount The amount of underlying tokens to deposit. /// @return The amount of wrapper tokens mint. function depositFor(address to, uint256 uAmount) external returns (uint256); /// @notice Burns wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @param uAmount The amount of underlying tokens to withdraw. /// @return The amount of wrapper tokens burnt. function withdraw(uint256 uAmount) external returns (uint256); /// @notice Burns wrapper tokens from {msg.sender} and transfers /// the underlying tokens back to the specified beneficiary. /// @param to The beneficiary account. /// @param uAmount The amount of underlying tokens to withdraw. /// @return The amount of wrapper tokens burnt. function withdrawTo(address to, uint256 uAmount) external returns (uint256); /// @notice Burns all wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @return The amount of wrapper tokens burnt. function withdrawAll() external returns (uint256); /// @notice Burns all wrapper tokens from {msg.sender} and transfers /// the underlying tokens back. /// @param to The beneficiary account. /// @return The amount of wrapper tokens burnt. function withdrawAllTo(address to) external returns (uint256); //-------------------------------------------------------------------------- // ButtonWrapper view methods /// @return The address of the underlying token. function underlying() external view returns (address); /// @return The total underlying tokens held by the wrapper contract. function totalUnderlying() external view returns (uint256); /// @param who The account address. /// @return The underlying token balance of the account. function balanceOfUnderlying(address who) external view returns (uint256); /// @param uAmount The amount of underlying tokens. /// @return The amount of wrapper tokens exchangeable. function underlyingToWrapper(uint256 uAmount) external view returns (uint256); /// @param amount The amount of wrapper tokens. /// @return The amount of underlying tokens exchangeable. function wrapperToUnderlying(uint256 amount) external view returns (uint256); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @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 pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../proxy/utils/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 meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract ContextUpgradeable is Initializable { function __Context_init() internal initializer { __Context_init_unchained(); } function __Context_init_unchained() internal initializer { } function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } uint256[50] private __gap; }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @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"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { 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); } } } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
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