Token migration announcement. VAIOT token contract has migrated to a new address.
ERC-20
Old Contract
Overview
Max Total Supply
400,000,000 VAI
Holders
2,942 (0.00%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
7,000,902.915668780204783635 VAIValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
VAIToken
Compiler Version
v0.5.17+commit.d19bba13
Optimization Enabled:
Yes with 200 runs
Other Settings:
constantinople EvmVersion, GNU GPLv3 license
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2021-02-13 */ // File: openzeppelin-solidity/contracts/GSN/Context.sol pragma solidity ^0.5.0; /* * @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 Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } // File: openzeppelin-solidity/contracts/token/ERC777/IERC777.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777Token standard as defined in the EIP. * * This contract uses the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 registry standard] to let * token holders and recipients react to token movements by using setting implementers * for the associated interfaces in said registry. See {IERC1820Registry} and * {ERC1820Implementer}. */ interface IERC777 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() external view returns (string memory); /** * @dev Returns the smallest part of the token that is not divisible. This * means all token operations (creation, movement and destruction) must have * amounts that are a multiple of this number. * * For most token contracts, this value will equal 1. */ function granularity() external view returns (uint256); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by an account (`owner`). */ function balanceOf(address owner) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * If send or receive hooks are registered for the caller and `recipient`, * the corresponding functions will be called with `data` and empty * `operatorData`. See {IERC777Sender} and {IERC777Recipient}. * * Emits a {Sent} event. * * Requirements * * - the caller must have at least `amount` tokens. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the {IERC777Recipient} * interface. */ function send(address recipient, uint256 amount, bytes calldata data) external; /** * @dev Destroys `amount` tokens from the caller's account, reducing the * total supply. * * If a send hook is registered for the caller, the corresponding function * will be called with `data` and empty `operatorData`. See {IERC777Sender}. * * Emits a {Burned} event. * * Requirements * * - the caller must have at least `amount` tokens. */ function burn(uint256 amount, bytes calldata data) external; /** * @dev Returns true if an account is an operator of `tokenHolder`. * Operators can send and burn tokens on behalf of their owners. All * accounts are their own operator. * * See {operatorSend} and {operatorBurn}. */ function isOperatorFor(address operator, address tokenHolder) external view returns (bool); /** * @dev Make an account an operator of the caller. * * See {isOperatorFor}. * * Emits an {AuthorizedOperator} event. * * Requirements * * - `operator` cannot be calling address. */ function authorizeOperator(address operator) external; /** * @dev Make an account an operator of the caller. * * See {isOperatorFor} and {defaultOperators}. * * Emits a {RevokedOperator} event. * * Requirements * * - `operator` cannot be calling address. */ function revokeOperator(address operator) external; /** * @dev Returns the list of default operators. These accounts are operators * for all token holders, even if {authorizeOperator} was never called on * them. * * This list is immutable, but individual holders may revoke these via * {revokeOperator}, in which case {isOperatorFor} will return false. */ function defaultOperators() external view returns (address[] memory); /** * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must * be an operator of `sender`. * * If send or receive hooks are registered for `sender` and `recipient`, * the corresponding functions will be called with `data` and * `operatorData`. See {IERC777Sender} and {IERC777Recipient}. * * Emits a {Sent} event. * * Requirements * * - `sender` cannot be the zero address. * - `sender` must have at least `amount` tokens. * - the caller must be an operator for `sender`. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the {IERC777Recipient} * interface. */ function operatorSend( address sender, address recipient, uint256 amount, bytes calldata data, bytes calldata operatorData ) external; /** * @dev Destoys `amount` tokens from `account`, reducing the total supply. * The caller must be an operator of `account`. * * If a send hook is registered for `account`, the corresponding function * will be called with `data` and `operatorData`. See {IERC777Sender}. * * Emits a {Burned} event. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. * - the caller must be an operator for `account`. */ function operatorBurn( address account, uint256 amount, bytes calldata data, bytes calldata operatorData ) external; event Sent( address indexed operator, address indexed from, address indexed to, uint256 amount, bytes data, bytes operatorData ); event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData); event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData); event AuthorizedOperator(address indexed operator, address indexed tokenHolder); event RevokedOperator(address indexed operator, address indexed tokenHolder); } // File: openzeppelin-solidity/contracts/token/ERC777/IERC777Recipient.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP. * * Accounts can be notified of {IERC777} tokens being sent to them by having a * contract implement this interface (contract holders can be their own * implementer) and registering it on the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry]. * * See {IERC1820Registry} and {ERC1820Implementer}. */ interface IERC777Recipient { /** * @dev Called by an {IERC777} token contract whenever tokens are being * moved or created into a registered account (`to`). The type of operation * is conveyed by `from` being the zero address or not. * * This call occurs _after_ the token contract's state is updated, so * {IERC777-balanceOf}, etc., can be used to query the post-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensReceived( address operator, address from, address to, uint256 amount, bytes calldata userData, bytes calldata operatorData ) external; } // File: openzeppelin-solidity/contracts/token/ERC777/IERC777Sender.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensSender standard as defined in the EIP. * * {IERC777} Token holders can be notified of operations performed on their * tokens by having a contract implement this interface (contract holders can be * their own implementer) and registering it on the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry]. * * See {IERC1820Registry} and {ERC1820Implementer}. */ interface IERC777Sender { /** * @dev Called by an {IERC777} token contract whenever a registered holder's * (`from`) tokens are about to be moved or destroyed. The type of operation * is conveyed by `to` being the zero address or not. * * This call occurs _before_ the token contract's state is updated, so * {IERC777-balanceOf}, etc., can be used to query the pre-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensToSend( address operator, address from, address to, uint256 amount, bytes calldata userData, bytes calldata operatorData ) external; } // File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ 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); } // File: openzeppelin-solidity/contracts/math/SafeMath.sol pragma solidity ^0.5.0; /** * @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. * * _Available since v2.4.0._ */ 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. * * _Available since v2.4.0._ */ 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. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } } // File: openzeppelin-solidity/contracts/utils/Address.sol pragma solidity ^0.5.5; /** * @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) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @dev Converts an `address` into `address payable`. Note that this is * simply a type cast: the actual underlying value is not changed. * * _Available since v2.4.0._ */ function toPayable(address account) internal pure returns (address payable) { return address(uint160(account)); } /** * @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]. * * _Available since v2.4.0._ */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-call-value (bool success, ) = recipient.call.value(amount)(""); require(success, "Address: unable to send value, recipient may have reverted"); } } // File: openzeppelin-solidity/contracts/introspection/IERC1820Registry.sol pragma solidity ^0.5.0; /** * @dev Interface of the global ERC1820 Registry, as defined in the * https://eips.ethereum.org/EIPS/eip-1820[EIP]. Accounts may register * implementers for interfaces in this registry, as well as query support. * * Implementers may be shared by multiple accounts, and can also implement more * than a single interface for each account. Contracts can implement interfaces * for themselves, but externally-owned accounts (EOA) must delegate this to a * contract. * * {IERC165} interfaces can also be queried via the registry. * * For an in-depth explanation and source code analysis, see the EIP text. */ interface IERC1820Registry { /** * @dev Sets `newManager` as the manager for `account`. A manager of an * account is able to set interface implementers for it. * * By default, each account is its own manager. Passing a value of `0x0` in * `newManager` will reset the manager to this initial state. * * Emits a {ManagerChanged} event. * * Requirements: * * - the caller must be the current manager for `account`. */ function setManager(address account, address newManager) external; /** * @dev Returns the manager for `account`. * * See {setManager}. */ function getManager(address account) external view returns (address); /** * @dev Sets the `implementer` contract as `account`'s implementer for * `interfaceHash`. * * `account` being the zero address is an alias for the caller's address. * The zero address can also be used in `implementer` to remove an old one. * * See {interfaceHash} to learn how these are created. * * Emits an {InterfaceImplementerSet} event. * * Requirements: * * - the caller must be the current manager for `account`. * - `interfaceHash` must not be an {IERC165} interface id (i.e. it must not * end in 28 zeroes). * - `implementer` must implement {IERC1820Implementer} and return true when * queried for support, unless `implementer` is the caller. See * {IERC1820Implementer-canImplementInterfaceForAddress}. */ function setInterfaceImplementer(address account, bytes32 interfaceHash, address implementer) external; /** * @dev Returns the implementer of `interfaceHash` for `account`. If no such * implementer is registered, returns the zero address. * * If `interfaceHash` is an {IERC165} interface id (i.e. it ends with 28 * zeroes), `account` will be queried for support of it. * * `account` being the zero address is an alias for the caller's address. */ function getInterfaceImplementer(address account, bytes32 interfaceHash) external view returns (address); /** * @dev Returns the interface hash for an `interfaceName`, as defined in the * corresponding * https://eips.ethereum.org/EIPS/eip-1820#interface-name[section of the EIP]. */ function interfaceHash(string calldata interfaceName) external pure returns (bytes32); /** * @notice Updates the cache with whether the contract implements an ERC165 interface or not. * @param account Address of the contract for which to update the cache. * @param interfaceId ERC165 interface for which to update the cache. */ function updateERC165Cache(address account, bytes4 interfaceId) external; /** * @notice Checks whether a contract implements an ERC165 interface or not. * If the result is not cached a direct lookup on the contract address is performed. * If the result is not cached or the cached value is out-of-date, the cache MUST be updated manually by calling * {updateERC165Cache} with the contract address. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165Interface(address account, bytes4 interfaceId) external view returns (bool); /** * @notice Checks whether a contract implements an ERC165 interface or not without using nor updating the cache. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165InterfaceNoCache(address account, bytes4 interfaceId) external view returns (bool); event InterfaceImplementerSet(address indexed account, bytes32 indexed interfaceHash, address indexed implementer); event ManagerChanged(address indexed account, address indexed newManager); } // File: openzeppelin-solidity/contracts/token/ERC777/ERC777.sol pragma solidity ^0.5.0; /** * @dev Implementation of the {IERC777} interface. * * 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}. * * Support for ERC20 is included in this contract, as specified by the EIP: both * the ERC777 and ERC20 interfaces can be safely used when interacting with it. * Both {IERC777-Sent} and {IERC20-Transfer} events are emitted on token * movements. * * Additionally, the {IERC777-granularity} value is hard-coded to `1`, meaning that there * are no special restrictions in the amount of tokens that created, moved, or * destroyed. This makes integration with ERC20 applications seamless. */ contract ERC777 is Context, IERC777, IERC20 { using SafeMath for uint256; using Address for address; IERC1820Registry constant internal ERC1820_REGISTRY = IERC1820Registry(0x1820a4B7618BdE71Dce8cdc73aAB6C95905faD24); mapping(address => uint256) private _balances; uint256 private _totalSupply; string private _name; string private _symbol; // We inline the result of the following hashes because Solidity doesn't resolve them at compile time. // See https://github.com/ethereum/solidity/issues/4024. // keccak256("ERC777TokensSender") bytes32 constant private TOKENS_SENDER_INTERFACE_HASH = 0x29ddb589b1fb5fc7cf394961c1adf5f8c6454761adf795e67fe149f658abe895; // keccak256("ERC777TokensRecipient") bytes32 constant private TOKENS_RECIPIENT_INTERFACE_HASH = 0xb281fc8c12954d22544db45de3159a39272895b169a852b314f9cc762e44c53b; // This isn't ever read from - it's only used to respond to the defaultOperators query. address[] private _defaultOperatorsArray; // Immutable, but accounts may revoke them (tracked in __revokedDefaultOperators). mapping(address => bool) private _defaultOperators; // For each account, a mapping of its operators and revoked default operators. mapping(address => mapping(address => bool)) private _operators; mapping(address => mapping(address => bool)) private _revokedDefaultOperators; // ERC20-allowances mapping (address => mapping (address => uint256)) private _allowances; /** * @dev `defaultOperators` may be an empty array. */ constructor( string memory name, string memory symbol, address[] memory defaultOperators ) public { _name = name; _symbol = symbol; _defaultOperatorsArray = defaultOperators; for (uint256 i = 0; i < _defaultOperatorsArray.length; i++) { _defaultOperators[_defaultOperatorsArray[i]] = true; } // register interfaces ERC1820_REGISTRY.setInterfaceImplementer(address(this), keccak256("ERC777Token"), address(this)); ERC1820_REGISTRY.setInterfaceImplementer(address(this), keccak256("ERC20Token"), address(this)); } /** * @dev See {IERC777-name}. */ function name() public view returns (string memory) { return _name; } /** * @dev See {IERC777-symbol}. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev See {ERC20Detailed-decimals}. * * Always returns 18, as per the * [ERC777 EIP](https://eips.ethereum.org/EIPS/eip-777#backward-compatibility). */ function decimals() public pure returns (uint8) { return 18; } /** * @dev See {IERC777-granularity}. * * This implementation always returns `1`. */ function granularity() public view returns (uint256) { return 1; } /** * @dev See {IERC777-totalSupply}. */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev Returns the amount of tokens owned by an account (`tokenHolder`). */ function balanceOf(address tokenHolder) public view returns (uint256) { return _balances[tokenHolder]; } /** * @dev See {IERC777-send}. * * Also emits a {IERC20-Transfer} event for ERC20 compatibility. */ function send(address recipient, uint256 amount, bytes memory data) public { _send(_msgSender(), _msgSender(), recipient, amount, data, "", true); } /** * @dev See {IERC20-transfer}. * * Unlike `send`, `recipient` is _not_ required to implement the {IERC777Recipient} * interface if it is a contract. * * Also emits a {Sent} event. */ function transfer(address recipient, uint256 amount) public returns (bool) { require(recipient != address(0), "ERC777: transfer to the zero address"); address from = _msgSender(); _callTokensToSend(from, from, recipient, amount, "", ""); _move(from, from, recipient, amount, "", ""); _callTokensReceived(from, from, recipient, amount, "", "", false); return true; } /** * @dev See {IERC777-burn}. * * Also emits a {IERC20-Transfer} event for ERC20 compatibility. */ function burn(uint256 amount, bytes memory data) public { _burn(_msgSender(), _msgSender(), amount, data, ""); } /** * @dev See {IERC777-isOperatorFor}. */ function isOperatorFor( address operator, address tokenHolder ) public view returns (bool) { return operator == tokenHolder || (_defaultOperators[operator] && !_revokedDefaultOperators[tokenHolder][operator]) || _operators[tokenHolder][operator]; } /** * @dev See {IERC777-authorizeOperator}. */ function authorizeOperator(address operator) public { require(_msgSender() != operator, "ERC777: authorizing self as operator"); if (_defaultOperators[operator]) { delete _revokedDefaultOperators[_msgSender()][operator]; } else { _operators[_msgSender()][operator] = true; } emit AuthorizedOperator(operator, _msgSender()); } /** * @dev See {IERC777-revokeOperator}. */ function revokeOperator(address operator) public { require(operator != _msgSender(), "ERC777: revoking self as operator"); if (_defaultOperators[operator]) { _revokedDefaultOperators[_msgSender()][operator] = true; } else { delete _operators[_msgSender()][operator]; } emit RevokedOperator(operator, _msgSender()); } /** * @dev See {IERC777-defaultOperators}. */ function defaultOperators() public view returns (address[] memory) { return _defaultOperatorsArray; } /** * @dev See {IERC777-operatorSend}. * * Emits {Sent} and {IERC20-Transfer} events. */ function operatorSend( address sender, address recipient, uint256 amount, bytes memory data, bytes memory operatorData ) public { require(isOperatorFor(_msgSender(), sender), "ERC777: caller is not an operator for holder"); _send(_msgSender(), sender, recipient, amount, data, operatorData, true); } /** * @dev See {IERC777-operatorBurn}. * * Emits {Burned} and {IERC20-Transfer} events. */ function operatorBurn(address account, uint256 amount, bytes memory data, bytes memory operatorData) public { require(isOperatorFor(_msgSender(), account), "ERC777: caller is not an operator for holder"); _burn(_msgSender(), account, amount, data, operatorData); } /** * @dev See {IERC20-allowance}. * * Note that operator and allowance concepts are orthogonal: operators may * not have allowance, and accounts with allowance may not be operators * themselves. */ function allowance(address holder, address spender) public view returns (uint256) { return _allowances[holder][spender]; } /** * @dev See {IERC20-approve}. * * Note that accounts cannot have allowance issued by their operators. */ function approve(address spender, uint256 value) public returns (bool) { address holder = _msgSender(); _approve(holder, spender, value); return true; } /** * @dev See {IERC20-transferFrom}. * * Note that operator and allowance concepts are orthogonal: operators cannot * call `transferFrom` (unless they have allowance), and accounts with * allowance cannot call `operatorSend` (unless they are operators). * * Emits {Sent}, {IERC20-Transfer} and {IERC20-Approval} events. */ function transferFrom(address holder, address recipient, uint256 amount) public returns (bool) { require(recipient != address(0), "ERC777: transfer to the zero address"); require(holder != address(0), "ERC777: transfer from the zero address"); address spender = _msgSender(); _callTokensToSend(spender, holder, recipient, amount, "", ""); _move(spender, holder, recipient, amount, "", ""); _approve(holder, spender, _allowances[holder][spender].sub(amount, "ERC777: transfer amount exceeds allowance")); _callTokensReceived(spender, holder, recipient, amount, "", "", false); return true; } /** * @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * If a send hook is registered for `account`, the corresponding function * will be called with `operator`, `data` and `operatorData`. * * See {IERC777Sender} and {IERC777Recipient}. * * Emits {Minted} and {IERC20-Transfer} events. * * Requirements * * - `account` cannot be the zero address. * - if `account` is a contract, it must implement the {IERC777Recipient} * interface. */ function _mint( address operator, address account, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { require(account != address(0), "ERC777: mint to the zero address"); // Update state variables _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); _callTokensReceived(operator, address(0), account, amount, userData, operatorData, true); emit Minted(operator, account, amount, userData, operatorData); emit Transfer(address(0), account, amount); } /** * @dev Send tokens * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _send( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) internal { require(operator != address(0), "ERC777: operator is the zero address"); require(from != address(0), "ERC777: send from the zero address"); require(to != address(0), "ERC777: send to the zero address"); _callTokensToSend(operator, from, to, amount, userData, operatorData); _move(operator, from, to, amount, userData, operatorData); _callTokensReceived(operator, from, to, amount, userData, operatorData, requireReceptionAck); } /** * @dev Burn tokens * @param operator address operator requesting the operation * @param from address token holder address * @param amount uint256 amount of tokens to burn * @param data bytes extra information provided by the token holder * @param operatorData bytes extra information provided by the operator (if any) */ function _burn( address operator, address from, uint256 amount, bytes memory data, bytes memory operatorData ) internal { require(from != address(0), "ERC777: burn from the zero address"); _callTokensToSend(operator, from, address(0), amount, data, operatorData); // Update state variables _balances[from] = _balances[from].sub(amount, "ERC777: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Burned(operator, from, amount, data, operatorData); emit Transfer(from, address(0), amount); } function _move( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) private { _balances[from] = _balances[from].sub(amount, "ERC777: transfer amount exceeds balance"); _balances[to] = _balances[to].add(amount); emit Sent(operator, from, to, amount, userData, operatorData); emit Transfer(from, to, amount); } /** * @dev See {ERC20-_approve}. * * Note that accounts cannot have allowance issued by their operators. */ function _approve(address holder, address spender, uint256 value) internal { require(holder != address(0), "ERC777: approve from the zero address"); require(spender != address(0), "ERC777: approve to the zero address"); _allowances[holder][spender] = value; emit Approval(holder, spender, value); } /** * @dev Call from.tokensToSend() if the interface is registered * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) */ function _callTokensToSend( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { address implementer = ERC1820_REGISTRY.getInterfaceImplementer(from, TOKENS_SENDER_INTERFACE_HASH); if (implementer != address(0)) { IERC777Sender(implementer).tokensToSend(operator, from, to, amount, userData, operatorData); } } /** * @dev Call to.tokensReceived() if the interface is registered. Reverts if the recipient is a contract but * tokensReceived() was not registered for the recipient * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _callTokensReceived( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) internal { address implementer = ERC1820_REGISTRY.getInterfaceImplementer(to, TOKENS_RECIPIENT_INTERFACE_HASH); if (implementer != address(0)) { IERC777Recipient(implementer).tokensReceived(operator, from, to, amount, userData, operatorData); } else if (requireReceptionAck) { require(!to.isContract(), "ERC777: token recipient contract has no implementer for ERC777TokensRecipient"); } } } // File: openzeppelin-solidity/contracts/GSN/IRelayRecipient.sol pragma solidity ^0.5.0; /** * @dev Base interface for a contract that will be called via the GSN from {IRelayHub}. * * TIP: You don't need to write an implementation yourself! Inherit from {GSNRecipient} instead. */ interface IRelayRecipient { /** * @dev Returns the address of the {IRelayHub} instance this recipient interacts with. */ function getHubAddr() external view returns (address); /** * @dev Called by {IRelayHub} to validate if this recipient accepts being charged for a relayed call. Note that the * recipient will be charged regardless of the execution result of the relayed call (i.e. if it reverts or not). * * The relay request was originated by `from` and will be served by `relay`. `encodedFunction` is the relayed call * calldata, so its first four bytes are the function selector. The relayed call will be forwarded `gasLimit` gas, * and the transaction executed with a gas price of at least `gasPrice`. `relay`'s fee is `transactionFee`, and the * recipient will be charged at most `maxPossibleCharge` (in wei). `nonce` is the sender's (`from`) nonce for * replay attack protection in {IRelayHub}, and `approvalData` is a optional parameter that can be used to hold a signature * over all or some of the previous values. * * Returns a tuple, where the first value is used to indicate approval (0) or rejection (custom non-zero error code, * values 1 to 10 are reserved) and the second one is data to be passed to the other {IRelayRecipient} functions. * * {acceptRelayedCall} is called with 50k gas: if it runs out during execution, the request will be considered * rejected. A regular revert will also trigger a rejection. */ function acceptRelayedCall( address relay, address from, bytes calldata encodedFunction, uint256 transactionFee, uint256 gasPrice, uint256 gasLimit, uint256 nonce, bytes calldata approvalData, uint256 maxPossibleCharge ) external view returns (uint256, bytes memory); /** * @dev Called by {IRelayHub} on approved relay call requests, before the relayed call is executed. This allows to e.g. * pre-charge the sender of the transaction. * * `context` is the second value returned in the tuple by {acceptRelayedCall}. * * Returns a value to be passed to {postRelayedCall}. * * {preRelayedCall} is called with 100k gas: if it runs out during exection or otherwise reverts, the relayed call * will not be executed, but the recipient will still be charged for the transaction's cost. */ function preRelayedCall(bytes calldata context) external returns (bytes32); /** * @dev Called by {IRelayHub} on approved relay call requests, after the relayed call is executed. This allows to e.g. * charge the user for the relayed call costs, return any overcharges from {preRelayedCall}, or perform * contract-specific bookkeeping. * * `context` is the second value returned in the tuple by {acceptRelayedCall}. `success` is the execution status of * the relayed call. `actualCharge` is an estimate of how much the recipient will be charged for the transaction, * not including any gas used by {postRelayedCall} itself. `preRetVal` is {preRelayedCall}'s return value. * * * {postRelayedCall} is called with 100k gas: if it runs out during execution or otherwise reverts, the relayed call * and the call to {preRelayedCall} will be reverted retroactively, but the recipient will still be charged for the * transaction's cost. */ function postRelayedCall(bytes calldata context, bool success, uint256 actualCharge, bytes32 preRetVal) external; } // File: openzeppelin-solidity/contracts/GSN/IRelayHub.sol pragma solidity ^0.5.0; /** * @dev Interface for `RelayHub`, the core contract of the GSN. Users should not need to interact with this contract * directly. * * See the https://github.com/OpenZeppelin/openzeppelin-gsn-helpers[OpenZeppelin GSN helpers] for more information on * how to deploy an instance of `RelayHub` on your local test network. */ interface IRelayHub { // Relay management /** * @dev Adds stake to a relay and sets its `unstakeDelay`. If the relay does not exist, it is created, and the caller * of this function becomes its owner. If the relay already exists, only the owner can call this function. A relay * cannot be its own owner. * * All Ether in this function call will be added to the relay's stake. * Its unstake delay will be assigned to `unstakeDelay`, but the new value must be greater or equal to the current one. * * Emits a {Staked} event. */ function stake(address relayaddr, uint256 unstakeDelay) external payable; /** * @dev Emitted when a relay's stake or unstakeDelay are increased */ event Staked(address indexed relay, uint256 stake, uint256 unstakeDelay); /** * @dev Registers the caller as a relay. * The relay must be staked for, and not be a contract (i.e. this function must be called directly from an EOA). * * This function can be called multiple times, emitting new {RelayAdded} events. Note that the received * `transactionFee` is not enforced by {relayCall}. * * Emits a {RelayAdded} event. */ function registerRelay(uint256 transactionFee, string calldata url) external; /** * @dev Emitted when a relay is registered or re-registerd. Looking at these events (and filtering out * {RelayRemoved} events) lets a client discover the list of available relays. */ event RelayAdded(address indexed relay, address indexed owner, uint256 transactionFee, uint256 stake, uint256 unstakeDelay, string url); /** * @dev Removes (deregisters) a relay. Unregistered (but staked for) relays can also be removed. * * Can only be called by the owner of the relay. After the relay's `unstakeDelay` has elapsed, {unstake} will be * callable. * * Emits a {RelayRemoved} event. */ function removeRelayByOwner(address relay) external; /** * @dev Emitted when a relay is removed (deregistered). `unstakeTime` is the time when unstake will be callable. */ event RelayRemoved(address indexed relay, uint256 unstakeTime); /** Deletes the relay from the system, and gives back its stake to the owner. * * Can only be called by the relay owner, after `unstakeDelay` has elapsed since {removeRelayByOwner} was called. * * Emits an {Unstaked} event. */ function unstake(address relay) external; /** * @dev Emitted when a relay is unstaked for, including the returned stake. */ event Unstaked(address indexed relay, uint256 stake); // States a relay can be in enum RelayState { Unknown, // The relay is unknown to the system: it has never been staked for Staked, // The relay has been staked for, but it is not yet active Registered, // The relay has registered itself, and is active (can relay calls) Removed // The relay has been removed by its owner and can no longer relay calls. It must wait for its unstakeDelay to elapse before it can unstake } /** * @dev Returns a relay's status. Note that relays can be deleted when unstaked or penalized, causing this function * to return an empty entry. */ function getRelay(address relay) external view returns (uint256 totalStake, uint256 unstakeDelay, uint256 unstakeTime, address payable owner, RelayState state); // Balance management /** * @dev Deposits Ether for a contract, so that it can receive (and pay for) relayed transactions. * * Unused balance can only be withdrawn by the contract itself, by calling {withdraw}. * * Emits a {Deposited} event. */ function depositFor(address target) external payable; /** * @dev Emitted when {depositFor} is called, including the amount and account that was funded. */ event Deposited(address indexed recipient, address indexed from, uint256 amount); /** * @dev Returns an account's deposits. These can be either a contracts's funds, or a relay owner's revenue. */ function balanceOf(address target) external view returns (uint256); /** * Withdraws from an account's balance, sending it back to it. Relay owners call this to retrieve their revenue, and * contracts can use it to reduce their funding. * * Emits a {Withdrawn} event. */ function withdraw(uint256 amount, address payable dest) external; /** * @dev Emitted when an account withdraws funds from `RelayHub`. */ event Withdrawn(address indexed account, address indexed dest, uint256 amount); // Relaying /** * @dev Checks if the `RelayHub` will accept a relayed operation. * Multiple things must be true for this to happen: * - all arguments must be signed for by the sender (`from`) * - the sender's nonce must be the current one * - the recipient must accept this transaction (via {acceptRelayedCall}) * * Returns a `PreconditionCheck` value (`OK` when the transaction can be relayed), or a recipient-specific error * code if it returns one in {acceptRelayedCall}. */ function canRelay( address relay, address from, address to, bytes calldata encodedFunction, uint256 transactionFee, uint256 gasPrice, uint256 gasLimit, uint256 nonce, bytes calldata signature, bytes calldata approvalData ) external view returns (uint256 status, bytes memory recipientContext); // Preconditions for relaying, checked by canRelay and returned as the corresponding numeric values. enum PreconditionCheck { OK, // All checks passed, the call can be relayed WrongSignature, // The transaction to relay is not signed by requested sender WrongNonce, // The provided nonce has already been used by the sender AcceptRelayedCallReverted, // The recipient rejected this call via acceptRelayedCall InvalidRecipientStatusCode // The recipient returned an invalid (reserved) status code } /** * @dev Relays a transaction. * * For this to succeed, multiple conditions must be met: * - {canRelay} must `return PreconditionCheck.OK` * - the sender must be a registered relay * - the transaction's gas price must be larger or equal to the one that was requested by the sender * - the transaction must have enough gas to not run out of gas if all internal transactions (calls to the * recipient) use all gas available to them * - the recipient must have enough balance to pay the relay for the worst-case scenario (i.e. when all gas is * spent) * * If all conditions are met, the call will be relayed and the recipient charged. {preRelayedCall}, the encoded * function and {postRelayedCall} will be called in that order. * * Parameters: * - `from`: the client originating the request * - `to`: the target {IRelayRecipient} contract * - `encodedFunction`: the function call to relay, including data * - `transactionFee`: fee (%) the relay takes over actual gas cost * - `gasPrice`: gas price the client is willing to pay * - `gasLimit`: gas to forward when calling the encoded function * - `nonce`: client's nonce * - `signature`: client's signature over all previous params, plus the relay and RelayHub addresses * - `approvalData`: dapp-specific data forwared to {acceptRelayedCall}. This value is *not* verified by the * `RelayHub`, but it still can be used for e.g. a signature. * * Emits a {TransactionRelayed} event. */ function relayCall( address from, address to, bytes calldata encodedFunction, uint256 transactionFee, uint256 gasPrice, uint256 gasLimit, uint256 nonce, bytes calldata signature, bytes calldata approvalData ) external; /** * @dev Emitted when an attempt to relay a call failed. * * This can happen due to incorrect {relayCall} arguments, or the recipient not accepting the relayed call. The * actual relayed call was not executed, and the recipient not charged. * * The `reason` parameter contains an error code: values 1-10 correspond to `PreconditionCheck` entries, and values * over 10 are custom recipient error codes returned from {acceptRelayedCall}. */ event CanRelayFailed(address indexed relay, address indexed from, address indexed to, bytes4 selector, uint256 reason); /** * @dev Emitted when a transaction is relayed. * Useful when monitoring a relay's operation and relayed calls to a contract * * Note that the actual encoded function might be reverted: this is indicated in the `status` parameter. * * `charge` is the Ether value deducted from the recipient's balance, paid to the relay's owner. */ event TransactionRelayed(address indexed relay, address indexed from, address indexed to, bytes4 selector, RelayCallStatus status, uint256 charge); // Reason error codes for the TransactionRelayed event enum RelayCallStatus { OK, // The transaction was successfully relayed and execution successful - never included in the event RelayedCallFailed, // The transaction was relayed, but the relayed call failed PreRelayedFailed, // The transaction was not relayed due to preRelatedCall reverting PostRelayedFailed, // The transaction was relayed and reverted due to postRelatedCall reverting RecipientBalanceChanged // The transaction was relayed and reverted due to the recipient's balance changing } /** * @dev Returns how much gas should be forwarded to a call to {relayCall}, in order to relay a transaction that will * spend up to `relayedCallStipend` gas. */ function requiredGas(uint256 relayedCallStipend) external view returns (uint256); /** * @dev Returns the maximum recipient charge, given the amount of gas forwarded, gas price and relay fee. */ function maxPossibleCharge(uint256 relayedCallStipend, uint256 gasPrice, uint256 transactionFee) external view returns (uint256); // Relay penalization. // Any account can penalize relays, removing them from the system immediately, and rewarding the // reporter with half of the relay's stake. The other half is burned so that, even if the relay penalizes itself, it // still loses half of its stake. /** * @dev Penalize a relay that signed two transactions using the same nonce (making only the first one valid) and * different data (gas price, gas limit, etc. may be different). * * The (unsigned) transaction data and signature for both transactions must be provided. */ function penalizeRepeatedNonce(bytes calldata unsignedTx1, bytes calldata signature1, bytes calldata unsignedTx2, bytes calldata signature2) external; /** * @dev Penalize a relay that sent a transaction that didn't target `RelayHub`'s {registerRelay} or {relayCall}. */ function penalizeIllegalTransaction(bytes calldata unsignedTx, bytes calldata signature) external; /** * @dev Emitted when a relay is penalized. */ event Penalized(address indexed relay, address sender, uint256 amount); /** * @dev Returns an account's nonce in `RelayHub`. */ function getNonce(address from) external view returns (uint256); } // File: openzeppelin-solidity/contracts/GSN/GSNRecipient.sol pragma solidity ^0.5.0; /** * @dev Base GSN recipient contract: includes the {IRelayRecipient} interface * and enables GSN support on all contracts in the inheritance tree. * * TIP: This contract is abstract. The functions {IRelayRecipient-acceptRelayedCall}, * {_preRelayedCall}, and {_postRelayedCall} are not implemented and must be * provided by derived contracts. See the * xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategies] for more * information on how to use the pre-built {GSNRecipientSignature} and * {GSNRecipientERC20Fee}, or how to write your own. */ contract GSNRecipient is IRelayRecipient, Context { // Default RelayHub address, deployed on mainnet and all testnets at the same address address private _relayHub = 0xD216153c06E857cD7f72665E0aF1d7D82172F494; uint256 constant private RELAYED_CALL_ACCEPTED = 0; uint256 constant private RELAYED_CALL_REJECTED = 11; // How much gas is forwarded to postRelayedCall uint256 constant internal POST_RELAYED_CALL_MAX_GAS = 100000; /** * @dev Emitted when a contract changes its {IRelayHub} contract to a new one. */ event RelayHubChanged(address indexed oldRelayHub, address indexed newRelayHub); /** * @dev Returns the address of the {IRelayHub} contract for this recipient. */ function getHubAddr() public view returns (address) { return _relayHub; } /** * @dev Switches to a new {IRelayHub} instance. This method is added for future-proofing: there's no reason to not * use the default instance. * * IMPORTANT: After upgrading, the {GSNRecipient} will no longer be able to receive relayed calls from the old * {IRelayHub} instance. Additionally, all funds should be previously withdrawn via {_withdrawDeposits}. */ function _upgradeRelayHub(address newRelayHub) internal { address currentRelayHub = _relayHub; require(newRelayHub != address(0), "GSNRecipient: new RelayHub is the zero address"); require(newRelayHub != currentRelayHub, "GSNRecipient: new RelayHub is the current one"); emit RelayHubChanged(currentRelayHub, newRelayHub); _relayHub = newRelayHub; } /** * @dev Returns the version string of the {IRelayHub} for which this recipient implementation was built. If * {_upgradeRelayHub} is used, the new {IRelayHub} instance should be compatible with this version. */ // This function is view for future-proofing, it may require reading from // storage in the future. function relayHubVersion() public view returns (string memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return "1.0.0"; } /** * @dev Withdraws the recipient's deposits in `RelayHub`. * * Derived contracts should expose this in an external interface with proper access control. */ function _withdrawDeposits(uint256 amount, address payable payee) internal { IRelayHub(_relayHub).withdraw(amount, payee); } // Overrides for Context's functions: when called from RelayHub, sender and // data require some pre-processing: the actual sender is stored at the end // of the call data, which in turns means it needs to be removed from it // when handling said data. /** * @dev Replacement for msg.sender. Returns the actual sender of a transaction: msg.sender for regular transactions, * and the end-user for GSN relayed calls (where msg.sender is actually `RelayHub`). * * IMPORTANT: Contracts derived from {GSNRecipient} should never use `msg.sender`, and use {_msgSender} instead. */ function _msgSender() internal view returns (address payable) { if (msg.sender != _relayHub) { return msg.sender; } else { return _getRelayedCallSender(); } } /** * @dev Replacement for msg.data. Returns the actual calldata of a transaction: msg.data for regular transactions, * and a reduced version for GSN relayed calls (where msg.data contains additional information). * * IMPORTANT: Contracts derived from {GSNRecipient} should never use `msg.data`, and use {_msgData} instead. */ function _msgData() internal view returns (bytes memory) { if (msg.sender != _relayHub) { return msg.data; } else { return _getRelayedCallData(); } } // Base implementations for pre and post relayedCall: only RelayHub can invoke them, and data is forwarded to the // internal hook. /** * @dev See `IRelayRecipient.preRelayedCall`. * * This function should not be overriden directly, use `_preRelayedCall` instead. * * * Requirements: * * - the caller must be the `RelayHub` contract. */ function preRelayedCall(bytes calldata context) external returns (bytes32) { require(msg.sender == getHubAddr(), "GSNRecipient: caller is not RelayHub"); return _preRelayedCall(context); } /** * @dev See `IRelayRecipient.preRelayedCall`. * * Called by `GSNRecipient.preRelayedCall`, which asserts the caller is the `RelayHub` contract. Derived contracts * must implement this function with any relayed-call preprocessing they may wish to do. * */ function _preRelayedCall(bytes memory context) internal returns (bytes32); /** * @dev See `IRelayRecipient.postRelayedCall`. * * This function should not be overriden directly, use `_postRelayedCall` instead. * * * Requirements: * * - the caller must be the `RelayHub` contract. */ function postRelayedCall(bytes calldata context, bool success, uint256 actualCharge, bytes32 preRetVal) external { require(msg.sender == getHubAddr(), "GSNRecipient: caller is not RelayHub"); _postRelayedCall(context, success, actualCharge, preRetVal); } /** * @dev See `IRelayRecipient.postRelayedCall`. * * Called by `GSNRecipient.postRelayedCall`, which asserts the caller is the `RelayHub` contract. Derived contracts * must implement this function with any relayed-call postprocessing they may wish to do. * */ function _postRelayedCall(bytes memory context, bool success, uint256 actualCharge, bytes32 preRetVal) internal; /** * @dev Return this in acceptRelayedCall to proceed with the execution of a relayed call. Note that this contract * will be charged a fee by RelayHub */ function _approveRelayedCall() internal pure returns (uint256, bytes memory) { return _approveRelayedCall(""); } /** * @dev See `GSNRecipient._approveRelayedCall`. * * This overload forwards `context` to _preRelayedCall and _postRelayedCall. */ function _approveRelayedCall(bytes memory context) internal pure returns (uint256, bytes memory) { return (RELAYED_CALL_ACCEPTED, context); } /** * @dev Return this in acceptRelayedCall to impede execution of a relayed call. No fees will be charged. */ function _rejectRelayedCall(uint256 errorCode) internal pure returns (uint256, bytes memory) { return (RELAYED_CALL_REJECTED + errorCode, ""); } /* * @dev Calculates how much RelayHub will charge a recipient for using `gas` at a `gasPrice`, given a relayer's * `serviceFee`. */ function _computeCharge(uint256 gas, uint256 gasPrice, uint256 serviceFee) internal pure returns (uint256) { // The fee is expressed as a percentage. E.g. a value of 40 stands for a 40% fee, so the recipient will be // charged for 1.4 times the spent amount. return (gas * gasPrice * (100 + serviceFee)) / 100; } function _getRelayedCallSender() private pure returns (address payable result) { // We need to read 20 bytes (an address) located at array index msg.data.length - 20. In memory, the array // is prefixed with a 32-byte length value, so we first add 32 to get the memory read index. However, doing // so would leave the address in the upper 20 bytes of the 32-byte word, which is inconvenient and would // require bit shifting. We therefore subtract 12 from the read index so the address lands on the lower 20 // bytes. This can always be done due to the 32-byte prefix. // The final memory read index is msg.data.length - 20 + 32 - 12 = msg.data.length. Using inline assembly is the // easiest/most-efficient way to perform this operation. // These fields are not accessible from assembly bytes memory array = msg.data; uint256 index = msg.data.length; // solhint-disable-next-line no-inline-assembly assembly { // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. result := and(mload(add(array, index)), 0xffffffffffffffffffffffffffffffffffffffff) } return result; } function _getRelayedCallData() private pure returns (bytes memory) { // RelayHub appends the sender address at the end of the calldata, so in order to retrieve the actual msg.data, // we must strip the last 20 bytes (length of an address type) from it. uint256 actualDataLength = msg.data.length - 20; bytes memory actualData = new bytes(actualDataLength); for (uint256 i = 0; i < actualDataLength; ++i) { actualData[i] = msg.data[i]; } return actualData; } } // File: openzeppelin-solidity/contracts/cryptography/ECDSA.sol pragma solidity ^0.5.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * NOTE: This call _does not revert_ if the signature is invalid, or * if the signer is otherwise unable to be retrieved. In those scenarios, * the zero address is returned. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length if (signature.length != 65) { return (address(0)); } // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. // solhint-disable-next-line no-inline-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return address(0); } if (v != 27 && v != 28) { return address(0); } // If the signature is valid (and not malleable), return the signer address return ecrecover(hash, v, r, s); } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * replicates the behavior of the * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`] * JSON-RPC method. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } } // File: openzeppelin-solidity/contracts/GSN/GSNRecipientSignature.sol pragma solidity ^0.5.0; /** * @dev A xref:ROOT:gsn-strategies.adoc#gsn-strategies[GSN strategy] that allows relayed transactions through when they are * accompanied by the signature of a trusted signer. The intent is for this signature to be generated by a server that * performs validations off-chain. Note that nothing is charged to the user in this scheme. Thus, the server should make * sure to account for this in their economic and threat model. */ contract GSNRecipientSignature is GSNRecipient { using ECDSA for bytes32; address private _trustedSigner; enum GSNRecipientSignatureErrorCodes { INVALID_SIGNER } /** * @dev Sets the trusted signer that is going to be producing signatures to approve relayed calls. */ constructor(address trustedSigner) public { require(trustedSigner != address(0), "GSNRecipientSignature: trusted signer is the zero address"); _trustedSigner = trustedSigner; } /** * @dev Ensures that only transactions with a trusted signature can be relayed through the GSN. */ function acceptRelayedCall( address relay, address from, bytes calldata encodedFunction, uint256 transactionFee, uint256 gasPrice, uint256 gasLimit, uint256 nonce, bytes calldata approvalData, uint256 ) external view returns (uint256, bytes memory) { bytes memory blob = abi.encodePacked( relay, from, encodedFunction, transactionFee, gasPrice, gasLimit, nonce, // Prevents replays on RelayHub getHubAddr(), // Prevents replays in multiple RelayHubs address(this) // Prevents replays in multiple recipients ); if (keccak256(blob).toEthSignedMessageHash().recover(approvalData) == _trustedSigner) { return _approveRelayedCall(); } else { return _rejectRelayedCall(uint256(GSNRecipientSignatureErrorCodes.INVALID_SIGNER)); } } function _preRelayedCall(bytes memory) internal returns (bytes32) { // solhint-disable-previous-line no-empty-blocks } function _postRelayedCall(bytes memory, bool, uint256, bytes32) internal { // solhint-disable-previous-line no-empty-blocks } } // File: contracts/VAIToken.sol pragma solidity ^0.5.0; contract VAIToken is ERC777, GSNRecipientSignature { constructor( string memory _name, // name of token string memory _symbol, // symbol of token uint256 _totalSupply, // total supply of tokens address _trustedSigner // sender of feeless transfers ) ERC777(_name, _symbol, new address[](0)) GSNRecipientSignature(_trustedSigner) public { _mint(_msgSender(), _msgSender(), _totalSupply * 10 ** 18, "", ""); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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ion"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"defaultOperators","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getHubAddr","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"granularity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"address","name":"tokenHolder","type":"address"}],"name":"isOperatorFor","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes","name":"operatorData","type":"bytes"}],"name":"operatorBurn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes","name":"operatorData","type":"bytes"}],"name":"operatorSend","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes","name":"context","type":"bytes"},{"internalType":"bool","name":"success","type":"bool"},{"internalType":"uint256","name":"actualCharge","type":"uint256"},{"internalType":"bytes32","name":"preRetVal","type":"bytes32"}],"name":"postRelayedCall","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"bytes","name":"context","type":"bytes"}],"name":"preRelayedCall","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"relayHubVersion","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"operator","type":"address"}],"name":"revokeOperator","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"holder","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000017d7840000000000000000000000000072467b9c36dc52b30f2eafdeffe20be425a702b1000000000000000000000000000000000000000000000000000000000000000b5641494f5420546f6b656e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000035641490000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): VAIOT Token
Arg [1] : _symbol (string): VAI
Arg [2] : _totalSupply (uint256): 400000000
Arg [3] : _trustedSigner (address): 0x72467B9c36dc52b30F2eafdEFfe20be425a702B1
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000017d78400
Arg [3] : 00000000000000000000000072467b9c36dc52b30f2eafdeffe20be425a702b1
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000b
Arg [5] : 5641494f5420546f6b656e000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 5641490000000000000000000000000000000000000000000000000000000000
Deployed Bytecode Sourcemap
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Swarm Source
bzzr://3cb7f131216fad70396e6a1adaab0bd3f11111fe289b2b03bd3631591d6560a9
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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.