Address Details
contract
token

0x49d2BB4A247E38b817E9404246DBc48Ca6707831

PermittableToken legacy ATS for token swap (xATS_tmp) Last Balance Update: Block #18274105
Created by 0xade972–5d2b10 at 0x4a8552–61c631

Balance

0 xDAI

(@ /xDAI)

Fetching tokens...

Contract name:
PermittableToken




Optimization enabled
true
Compiler version
v0.4.24+commit.e67f0147




Optimization runs
200
EVM Version
default




Verified at
2021-03-02 12:19:52.814483Z

Constructor Arguments

000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000012000000000000000000000000000000000000000000000000000000000000006400000000000000000000000000000000000000000000000000000000000000196c65676163792041545320666f7220746f6b656e2073776170000000000000000000000000000000000000000000000000000000000000000000000000000008784154535f746d70000000000000000000000000000000000000000000000000

Arg [0] (string) : legacy ATS for token swap
Arg [1] (string) : xATS_tmp
Arg [2] (uint8) : 18
Arg [3] (uint256) : 100

              

Contract source code

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol
pragma solidity ^0.4.24;
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* See https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
function totalSupply() public view returns (uint256);
function balanceOf(address _who) public view returns (uint256);
function transfer(address _to, uint256 _value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
// File: openzeppelin-solidity/contracts/math/SafeMath.sol
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (_a == 0) {
return 0;
}
c = _a * _b;
assert(c / _a == _b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
// assert(_b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = _a / _b;
// assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
return _a / _b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
assert(_b <= _a);
return _a - _b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
c = _a + _b;
assert(c >= _a);
return c;
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/BasicToken.sol
pragma solidity ^0.4.24;
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) internal balances;
uint256 internal totalSupply_;
/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return totalSupply_;
}
/**
* @dev Transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) public returns (bool) {
require(_value <= balances[msg.sender]);
require(_to != address(0));
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public view returns (uint256) {
return balances[_owner];
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/BurnableToken.sol
pragma solidity ^0.4.24;
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract BurnableToken is BasicToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev Burns a specific amount of tokens.
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) public {
_burn(msg.sender, _value);
}
function _burn(address _who, uint256 _value) internal {
require(_value <= balances[_who]);
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
balances[_who] = balances[_who].sub(_value);
totalSupply_ = totalSupply_.sub(_value);
emit Burn(_who, _value);
emit Transfer(_who, address(0), _value);
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.4.24;
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is ERC20Basic {
function allowance(address _owner, address _spender)
public view returns (uint256);
function transferFrom(address _from, address _to, uint256 _value)
public returns (bool);
function approve(address _spender, uint256 _value) public returns (bool);
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
}
// File: openzeppelin-solidity/contracts/token/ERC20/StandardToken.sol
pragma solidity ^0.4.24;
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* https://github.com/ethereum/EIPs/issues/20
* Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(
address _from,
address _to,
uint256 _value
)
public
returns (bool)
{
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
require(_to != address(0));
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* 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
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(
address _owner,
address _spender
)
public
view
returns (uint256)
{
return allowed[_owner][_spender];
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _addedValue The amount of tokens to increase the allowance by.
*/
function increaseApproval(
address _spender,
uint256 _addedValue
)
public
returns (bool)
{
allowed[msg.sender][_spender] = (
allowed[msg.sender][_spender].add(_addedValue));
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseApproval(
address _spender,
uint256 _subtractedValue
)
public
returns (bool)
{
uint256 oldValue = allowed[msg.sender][_spender];
if (_subtractedValue >= oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
// File: openzeppelin-solidity/contracts/ownership/Ownable.sol
pragma solidity ^0.4.24;
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address public owner;
event OwnershipRenounced(address indexed previousOwner);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
* @notice Renouncing to ownership will leave the contract without an owner.
* It will not be possible to call the functions with the `onlyOwner`
* modifier anymore.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function transferOwnership(address _newOwner) public onlyOwner {
_transferOwnership(_newOwner);
}
/**
* @dev Transfers control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function _transferOwnership(address _newOwner) internal {
require(_newOwner != address(0));
emit OwnershipTransferred(owner, _newOwner);
owner = _newOwner;
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/MintableToken.sol
pragma solidity ^0.4.24;
/**
* @title Mintable token
* @dev Simple ERC20 Token example, with mintable token creation
* Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
*/
contract MintableToken is StandardToken, Ownable {
event Mint(address indexed to, uint256 amount);
event MintFinished();
bool public mintingFinished = false;
modifier canMint() {
require(!mintingFinished);
_;
}
modifier hasMintPermission() {
require(msg.sender == owner);
_;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(
address _to,
uint256 _amount
)
public
hasMintPermission
canMint
returns (bool)
{
totalSupply_ = totalSupply_.add(_amount);
balances[_to] = balances[_to].add(_amount);
emit Mint(_to, _amount);
emit Transfer(address(0), _to, _amount);
return true;
}
/**
* @dev Function to stop minting new tokens.
* @return True if the operation was successful.
*/
function finishMinting() public onlyOwner canMint returns (bool) {
mintingFinished = true;
emit MintFinished();
return true;
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/DetailedERC20.sol
pragma solidity ^0.4.24;
/**
* @title DetailedERC20 token
* @dev The decimals are only for visualization purposes.
* All the operations are done using the smallest and indivisible token unit,
* just as on Ethereum all the operations are done in wei.
*/
contract DetailedERC20 is ERC20 {
string public name;
string public symbol;
uint8 public decimals;
constructor(string _name, string _symbol, uint8 _decimals) public {
name = _name;
symbol = _symbol;
decimals = _decimals;
}
}
// File: openzeppelin-solidity/contracts/AddressUtils.sol
pragma solidity ^0.4.24;
/**
* Utility library of inline functions on addresses
*/
library AddressUtils {
/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param _addr address to check
* @return whether the target address is a contract
*/
function isContract(address _addr) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
// solium-disable-next-line security/no-inline-assembly
assembly { size := extcodesize(_addr) }
return size > 0;
}
}
// File: contracts/interfaces/ERC677.sol
pragma solidity 0.4.24;
contract ERC677 is ERC20 {
event Transfer(address indexed from, address indexed to, uint256 value, bytes data);
function transferAndCall(address, uint256, bytes) external returns (bool);
function increaseAllowance(address spender, uint256 addedValue) public returns (bool);
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool);
}
contract LegacyERC20 {
function transfer(address _spender, uint256 _value) public; // returns (bool);
function transferFrom(address _owner, address _spender, uint256 _value) public; // returns (bool);
}
// File: contracts/interfaces/IBurnableMintableERC677Token.sol
pragma solidity 0.4.24;
contract IBurnableMintableERC677Token is ERC677 {
function mint(address _to, uint256 _amount) public returns (bool);
function burn(uint256 _value) public;
function claimTokens(address _token, address _to) external;
}
// File: contracts/upgradeable_contracts/Sacrifice.sol
pragma solidity 0.4.24;
contract Sacrifice {
constructor(address _recipient) public payable {
selfdestruct(_recipient);
}
}
// File: contracts/libraries/Address.sol
pragma solidity 0.4.24;
/**
* @title Address
* @dev Helper methods for Address type.
*/
library Address {
/**
* @dev Try to send native tokens to the address. If it fails, it will force the transfer by creating a selfdestruct contract
* @param _receiver address that will receive the native tokens
* @param _value the amount of native tokens to send
*/
function safeSendValue(address _receiver, uint256 _value) internal {
if (!_receiver.send(_value)) {
(new Sacrifice).value(_value)(_receiver);
}
}
}
// File: contracts/libraries/SafeERC20.sol
pragma solidity 0.4.24;
/**
* @title SafeERC20
* @dev Helper methods for safe token transfers.
* Functions perform additional checks to be sure that token transfer really happened.
*/
library SafeERC20 {
using SafeMath for uint256;
/**
* @dev Same as ERC20.transfer(address,uint256) but with extra consistency checks.
* @param _token address of the token contract
* @param _to address of the receiver
* @param _value amount of tokens to send
*/
function safeTransfer(address _token, address _to, uint256 _value) internal {
LegacyERC20(_token).transfer(_to, _value);
assembly {
if returndatasize {
returndatacopy(0, 0, 32)
if iszero(mload(0)) {
revert(0, 0)
}
}
}
}
/**
* @dev Same as ERC20.transferFrom(address,address,uint256) but with extra consistency checks.
* @param _token address of the token contract
* @param _from address of the sender
* @param _value amount of tokens to send
*/
function safeTransferFrom(address _token, address _from, uint256 _value) internal {
LegacyERC20(_token).transferFrom(_from, address(this), _value);
assembly {
if returndatasize {
returndatacopy(0, 0, 32)
if iszero(mload(0)) {
revert(0, 0)
}
}
}
}
}
// File: contracts/upgradeable_contracts/Claimable.sol
pragma solidity 0.4.24;
/**
* @title Claimable
* @dev Implementation of the claiming utils that can be useful for withdrawing accidentally sent tokens that are not used in bridge operations.
*/
contract Claimable {
using SafeERC20 for address;
/**
* Throws if a given address is equal to address(0)
*/
modifier validAddress(address _to) {
require(_to != address(0));
/* solcov ignore next */
_;
}
/**
* @dev Withdraws the erc20 tokens or native coins from this contract.
* Caller should additionally check that the claimed token is not a part of bridge operations (i.e. that token != erc20token()).
* @param _token address of the claimed token or address(0) for native coins.
* @param _to address of the tokens/coins receiver.
*/
function claimValues(address _token, address _to) internal validAddress(_to) {
if (_token == address(0)) {
claimNativeCoins(_to);
} else {
claimErc20Tokens(_token, _to);
}
}
/**
* @dev Internal function for withdrawing all native coins from the contract.
* @param _to address of the coins receiver.
*/
function claimNativeCoins(address _to) internal {
uint256 value = address(this).balance;
Address.safeSendValue(_to, value);
}
/**
* @dev Internal function for withdrawing all tokens of ssome particular ERC20 contract from this contract.
* @param _token address of the claimed ERC20 token.
* @param _to address of the tokens receiver.
*/
function claimErc20Tokens(address _token, address _to) internal {
ERC20Basic token = ERC20Basic(_token);
uint256 balance = token.balanceOf(this);
_token.safeTransfer(_to, balance);
}
}
// File: openzeppelin-solidity/contracts/introspection/ERC165.sol
pragma solidity ^0.4.24;
/**
* @title ERC165
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
*/
interface ERC165 {
/**
* @notice Query if a contract implements an interface
* @param _interfaceId The interface identifier, as specified in ERC-165
* @dev Interface identification is specified in ERC-165. This function
* uses less than 30,000 gas.
*/
function supportsInterface(bytes4 _interfaceId)
external
view
returns (bool);
}
// File: contracts/ERC677BridgeToken.sol
pragma solidity 0.4.24;
/**
* @title ERC677BridgeToken
* @dev The basic implementation of a bridgeable ERC677-compatible token
*/
contract ERC677BridgeToken is IBurnableMintableERC677Token, DetailedERC20, BurnableToken, MintableToken, Claimable {
bytes4 internal constant ON_TOKEN_TRANSFER = 0xa4c0ed36; // onTokenTransfer(address,uint256,bytes)
address internal bridgeContractAddr;
constructor(string _name, string _symbol, uint8 _decimals) public DetailedERC20(_name, _symbol, _decimals) {
// solhint-disable-previous-line no-empty-blocks
}
function bridgeContract() external view returns (address) {
return bridgeContractAddr;
}
function setBridgeContract(address _bridgeContract) external onlyOwner {
require(AddressUtils.isContract(_bridgeContract));
bridgeContractAddr = _bridgeContract;
}
modifier validRecipient(address _recipient) {
require(_recipient != address(0) && _recipient != address(this));
/* solcov ignore next */
_;
}
function transferAndCall(address _to, uint256 _value, bytes _data) external validRecipient(_to) returns (bool) {
require(superTransfer(_to, _value));
emit Transfer(msg.sender, _to, _value, _data);
if (AddressUtils.isContract(_to)) {
require(contractFallback(msg.sender, _to, _value, _data));
}
return true;
}
function getTokenInterfacesVersion() external pure returns (uint64 major, uint64 minor, uint64 patch) {
return (2, 4, 0);
}
function superTransfer(address _to, uint256 _value) internal returns (bool) {
return super.transfer(_to, _value);
}
function transfer(address _to, uint256 _value) public returns (bool) {
require(superTransfer(_to, _value));
callAfterTransfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(super.transferFrom(_from, _to, _value));
callAfterTransfer(_from, _to, _value);
return true;
}
/**
* @dev Internal function that calls onTokenTransfer callback on the receiver after the successful transfer.
* Since it is not present in the original ERC677 standard, the callback is only called on the bridge contract,
* in order to simplify UX. In other cases, this token complies with the ERC677/ERC20 standard.
* @param _from tokens sender address.
* @param _to tokens receiver address.
* @param _value amount of sent tokens.
*/
function callAfterTransfer(address _from, address _to, uint256 _value) internal {
bool isRegisteredERC677Receiver =
(AddressUtils.isContract(_to) && doesContractImplementInterface(_to, ON_TOKEN_TRANSFER)) ? true : false;
if (isBridge(_to) || isRegisteredERC677Receiver) {
require(contractFallback(_from, _to, _value, new bytes(0)));
}
}
function isBridge(address _address) public view returns (bool) {
return _address == bridgeContractAddr;
}
/**
* @dev call onTokenTransfer fallback on the token recipient contract
* @param _from tokens sender
* @param _to tokens recipient
* @param _value amount of tokens that was sent
* @param _data set of extra bytes that can be passed to the recipient
*/
function contractFallback(address _from, address _to, uint256 _value, bytes _data) private returns (bool) {
return _to.call(abi.encodeWithSelector(ON_TOKEN_TRANSFER, _from, _value, _data));
}
function finishMinting() public returns (bool) {
revert();
}
function renounceOwnership() public onlyOwner {
revert();
}
/**
* @dev Withdraws the erc20 tokens or native coins from this contract.
* @param _token address of the claimed token or address(0) for native coins.
* @param _to address of the tokens/coins receiver.
*/
function claimTokens(address _token, address _to) external onlyOwner {
claimValues(_token, _to);
}
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
return super.increaseApproval(spender, addedValue);
}
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
return super.decreaseApproval(spender, subtractedValue);
}
// ==================== ERC165 Checker =======================
// source: https://eips.ethereum.org/EIPS/eip-165
bytes4 constant InvalidID = 0xffffffff;
bytes4 constant ERC165ID = 0x01ffc9a7;
function doesContractImplementInterface(address _contract, bytes4 _interfaceId) constant internal returns (bool) {
uint256 success;
uint256 result;
(success, result) = noThrowCall(_contract, ERC165ID);
if ((success==0)||(result==0)) {
return false;
}
(success, result) = noThrowCall(_contract, InvalidID);
if ((success==0)||(result!=0)) {
return false;
}
(success, result) = noThrowCall(_contract, _interfaceId);
if ((success==1)&&(result==1)) {
return true;
}
return false;
}
function noThrowCall(address _contract, bytes4 _interfaceId) constant internal returns (uint256 success, uint256 result) {
bytes4 erc165ID = ERC165ID;
assembly {
let x := mload(0x40) // Find empty storage location using "free memory pointer"
mstore(x, erc165ID) // Place signature at beginning of empty storage
mstore(add(x, 0x04), _interfaceId) // Place first argument directly next to signature
success := staticcall(
30000, // 30k gas
_contract, // To addr
x, // Inputs are stored at location x
0x24, // Inputs are 36 bytes long
x, // Store output over input (saves space)
0x20) // Outputs are 32 bytes long
result := mload(x) // Load the result
}
}
}
// File: contracts/PermittableToken.sol
pragma solidity 0.4.24;
contract PermittableToken is ERC677BridgeToken {
string public constant version = "1";
// EIP712 niceties
bytes32 public DOMAIN_SEPARATOR;
// bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
mapping(address => uint256) public nonces;
mapping(address => mapping(address => uint256)) public expirations;
constructor(string memory _name, string memory _symbol, uint8 _decimals, uint256 _chainId)
public
ERC677BridgeToken(_name, _symbol, _decimals)
{
require(_chainId != 0);
DOMAIN_SEPARATOR = keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(_name)),
keccak256(bytes(version)),
_chainId,
address(this)
)
);
}
/// @dev transferFrom in this contract works in a slightly different form than the generic
/// transferFrom function. This contract allows for "unlimited approval".
/// Should the user approve an address for the maximum uint256 value,
/// then that address will have unlimited approval until told otherwise.
/// @param _sender The address of the sender.
/// @param _recipient The address of the recipient.
/// @param _amount The value to transfer.
/// @return Success status.
function transferFrom(address _sender, address _recipient, uint256 _amount) public returns (bool) {
require(_sender != address(0));
require(_recipient != address(0));
balances[_sender] = balances[_sender].sub(_amount);
balances[_recipient] = balances[_recipient].add(_amount);
emit Transfer(_sender, _recipient, _amount);
if (_sender != msg.sender) {
uint256 allowedAmount = allowance(_sender, msg.sender);
if (allowedAmount != uint256(-1)) {
// If allowance is limited, adjust it.
// In this case `transferFrom` works like the generic
allowed[_sender][msg.sender] = allowedAmount.sub(_amount);
emit Approval(_sender, msg.sender, allowed[_sender][msg.sender]);
} else {
// If allowance is unlimited by `permit`, `approve`, or `increaseAllowance`
// function, don't adjust it. But the expiration date must be empty or in the future
require(expirations[_sender][msg.sender] == 0 || expirations[_sender][msg.sender] >= _now());
}
} else {
// If `_sender` is `msg.sender`,
// the function works just like `transfer()`
}
callAfterTransfer(_sender, _recipient, _amount);
return true;
}
/// @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
/// @param _to The address which will spend the funds.
/// @param _value The amount of tokens to be spent.
function approve(address _to, uint256 _value) public returns (bool result) {
result = super.approve(_to, _value);
if (_value == uint256(-1)) {
delete expirations[msg.sender][_to];
}
}
/// @dev Atomically increases the allowance granted to spender by the caller.
/// @param _to The address which will spend the funds.
/// @param _addedValue The amount of tokens to increase the allowance by.
function increaseAllowance(address _to, uint256 _addedValue) public returns (bool result) {
result = super.increaseAllowance(_to, _addedValue);
if (allowed[msg.sender][_to] == uint256(-1)) {
delete expirations[msg.sender][_to];
}
}
/// @dev An alias for `transfer` function.
/// @param _to The address of the recipient.
/// @param _amount The value to transfer.
function push(address _to, uint256 _amount) public {
transferFrom(msg.sender, _to, _amount);
}
/// @dev Makes a request to transfer the specified amount
/// from the specified address to the caller's address.
/// @param _from The address of the holder.
/// @param _amount The value to transfer.
function pull(address _from, uint256 _amount) public {
transferFrom(_from, msg.sender, _amount);
}
/// @dev An alias for `transferFrom` function.
/// @param _from The address of the sender.
/// @param _to The address of the recipient.
/// @param _amount The value to transfer.
function move(address _from, address _to, uint256 _amount) public {
transferFrom(_from, _to, _amount);
}
/// @dev Allows to spend holder's unlimited amount by the specified spender.
/// The function can be called by anyone, but requires having allowance parameters
/// signed by the holder according to EIP712.
/// @param _holder The holder's address.
/// @param _spender The spender's address.
/// @param _nonce The nonce taken from `nonces(_holder)` public getter.
/// @param _expiry The allowance expiration date (unix timestamp in UTC).
/// Can be zero for no expiration. Forced to zero if `_allowed` is `false`.
/// Note that timestamps are not precise, malicious miner/validator can manipulate them to some extend.
/// Assume that there can be a 900 seconds time delta between the desired timestamp and the actual expiration.
/// @param _allowed True to enable unlimited allowance for the spender by the holder. False to disable.
/// @param _v A final byte of signature (ECDSA component).
/// @param _r The first 32 bytes of signature (ECDSA component).
/// @param _s The second 32 bytes of signature (ECDSA component).
function permit(
address _holder,
address _spender,
uint256 _nonce,
uint256 _expiry,
bool _allowed,
uint8 _v,
bytes32 _r,
bytes32 _s
) external {
require(_holder != address(0));
require(_spender != address(0));
require(_expiry == 0 || _now() <= _expiry);
require(_v == 27 || _v == 28);
require(uint256(_s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0);
bytes32 digest = keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH, _holder, _spender, _nonce, _expiry, _allowed))
)
);
require(_holder == ecrecover(digest, _v, _r, _s));
require(_nonce == nonces[_holder]++);
uint256 amount = _allowed ? uint256(-1) : 0;
allowed[_holder][_spender] = amount;
expirations[_holder][_spender] = _allowed ? _expiry : 0;
emit Approval(_holder, _spender, amount);
}
function _now() internal view returns (uint256) {
return now;
}
}

Contract ABI

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           

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