Contract Source Code:
pragma solidity >=0.6.0 <0.8.0;
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import '@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol';
library Constants {
address constant uniV2FactoryAddress = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
IUniswapV2Factory constant uniV2Factory = IUniswapV2Factory(uniV2FactoryAddress);
address constant uniV2Router02Address = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
IUniswapV2Router02 constant uniV2Router02 = IUniswapV2Router02(uniV2Router02Address);
uint32 constant Future2100 = 4102448400;
address constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
}
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "../token/safety/Locker.sol";
import "../token/Taxable.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
contract EvnToken is Taxable, ILockerUser {
uint256 constant CAP = 100000000 * 10 ** 18;
uint256 public defaultTaxRateOver1000;
ILocker public override locker;
constructor () ERC20("Evn Token", "EVN") public {
_mint(msg.sender, CAP);
}
function setDefaultTaxRate(uint256 taxRateOver1000)
external onlyOwner() {
defaultTaxRateOver1000 = taxRateOver1000;
}
function setLocker(address _locker)
external onlyOwner() {
locker = ILocker(_locker);
// ILocker(_locker).lockOrGetPenalty(msg.sender, address(this)); //verify can be called
}
function _transfer(address sender, address recipient, uint256 amount)
internal virtual override {
return _transferWithTax(sender, recipient, amount);
}
function _transferWithTax(address sender, address recipient, uint256 amount)
internal
{
require(sender != address(0), "ERC20: transfer from the zero address");
require(amount < 2 ** 127, "ERC20: amount too large");
if (sender == address(taxDistributor)) {
// Short circuit to save gas
_transferWithoutTax(sender, recipient, amount);
return;
}
(bool shouldOverridePenalty, uint256 overridenPenaltyOver1000) = locker.lockOrGetPenalty(sender, recipient);
// get the tax rate.
uint256 taxRate = shouldOverridePenalty ? overridenPenaltyOver1000 : defaultTaxRateOver1000;
if (taxRate != 0) {
uint256 taxAmount = taxRate.mul(amount).div(1000);
require(tax(sender, taxAmount), "ERC20: Could not apply tax");
amount = amount.sub(taxAmount);
}
_transferWithoutTax(sender, recipient, amount);
}
function _transferWithoutTax(address sender, address recipient, uint256 amount)
internal override {
return ERC20._transfer(sender, recipient, amount);
}
}
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
/**
* @dev Ferrum Staking interface for adding reward
*/
interface IFestakeRewardManager {
/**
* @dev legacy add reward. To be used by contract support time limitted rewards.
*/
function addReward(uint256 rewardAmount) external returns (bool);
/**
* @dev withdraw rewards for the user.
* The only option is to withdraw all rewards is one go.
*/
function withdrawRewards() external returns (uint256);
/**
* @dev marginal rewards is to be used by contracts supporting ongoing rewards.
* Send the reward to the contract address first.
*/
function addMarginalReward() external returns (bool);
function rewardToken() external view returns (IERC20);
function rewardsTotal() external view returns (uint256);
/**
* @dev returns current rewards for an address
*/
function rewardOf(address addr) external view returns (uint256);
}
pragma solidity >=0.6.0 <0.8.0;
import "./IFestakeRewardManager.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
interface IRewardDistributor {
function rollAndGetDistributionAddress(address addressForRandom) external view returns(address);
function updateRewards(address target) external returns(bool);
}
contract RewardDistributor is Ownable, IRewardDistributor {
struct RewardPools {
bytes pools;
}
RewardPools rewardPools;
address[] rewardReceivers;
function addNewPool(address pool)
onlyOwner()
external returns(bool) {
require(pool != address(0), "RewardD: Zero address");
require(rewardReceivers.length < 30, "RewardD: Max no of pools reached");
IFestakeRewardManager manager = IFestakeRewardManager(pool);
require(address(manager.rewardToken()) != address(0), "RewardD: No reward address was provided");
rewardReceivers.push(pool);
IFestakeRewardManager firstManager = IFestakeRewardManager(rewardReceivers[0]);
require(firstManager.rewardToken() == manager.rewardToken(),
"RewardD: Reward token inconsistent with current pools");
return true;
}
/**
* poolRatio is used for a gas efficient round-robbin distribution of rewards.
* Pack a number of uint8s in poolRatios. Maximum number of pools is 14.
* Sum of ratios must add to 100.
*/
function updateRewardDistributionForPools(bytes calldata poolRatios)
onlyOwner()
external returns (bool) {
uint sum = 0;
uint len = rewardReceivers.length;
for (uint i = 0; i < len; i++) {
sum = toUint8(poolRatios, i) + sum;
}
require(sum == 100, "ReardD: ratios must add to 100");
rewardPools.pools = poolRatios;
return true;
}
/**
* @dev be carefull. Randomly chooses a pool using round robbin.
* Assuming the transaction sizes are randomly distributed, each pool gets
* the right share of rewards in aggregate.
* Sacrificing accuracy for reduction in gas for each transaction.
*/
function rollAndGetDistributionAddress(address addressForRandom)
external override view returns(address) {
require(addressForRandom != address(0) , "RewardD: address cannot be 0");
uint256 rand = block.timestamp * (block.difficulty == 0 ? 1 : block.difficulty) *
(uint256(addressForRandom) >> 128) * 31 % 100;
uint sum = 0;
bytes memory poolRatios = rewardPools.pools;
uint256 len = rewardReceivers.length;
for (uint i = 0; i < len && i < poolRatios.length; i++) {
uint poolRatio = toUint8(poolRatios, i);
sum += poolRatio;
if (sum >= rand && poolRatio != 0 ) {
return rewardReceivers[i];
}
}
return address(0);
}
function updateRewards(address target) external override returns(bool) {
IFestakeRewardManager manager = IFestakeRewardManager(target);
return manager.addMarginalReward();
}
function bytes32ToBytes(bytes32 _bytes32) private pure returns (bytes memory) {
bytes memory bytesArray = new bytes(32);
for (uint256 i; i < 32; i++) {
bytesArray[i] = _bytes32[i];
}
return bytesArray;
}
function toByte32(bytes memory _bytes)
private pure returns (bytes32) {
bytes32 tempUint;
assembly {
tempUint := mload(add(add(_bytes, 0x20), 0))
}
return tempUint;
}
function toUint8(bytes memory _bytes, uint256 _start)
private pure returns (uint8) {
require(_start + 1 >= _start, "toUint8_overflow");
require(_bytes.length >= _start + 1 , "toUint8_outOfBounds");
uint8 tempUint;
assembly {
tempUint := mload(add(add(_bytes, 0x1), _start))
}
return tempUint;
}
}
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../staking/RewardDistributor.sol";
interface IERC20Burnable {
function burn(uint256 amount) external;
}
interface ITaxDistributor {
function distributeTax(address token) external returns(bool);
}
contract TaxDistributor is ITaxDistributor, Ownable {
using SafeMath for uint256;
struct Distribution {
uint8 stake;
uint8 burn;
uint8 future;
uint8 dev;
}
Distribution distribution;
IRewardDistributor rewardDistributor;
address devAddress;
address futureAddress;
function setRewardDistributor(address _rewardDistributor)
onlyOwner()
external returns(bool) {
IRewardDistributor rd = IRewardDistributor(_rewardDistributor);
address someAddress = rd.rollAndGetDistributionAddress(msg.sender);
require(someAddress != address(0), "StakeDevBurnTaxable: Bad reward distributor");
rewardDistributor = rd;
return true;
}
function setDevAddress(address _devAddress)
onlyOwner()
external returns(bool) {
devAddress = _devAddress; // Allow 0
return true;
}
function setFutureAddress(address _futureAddress)
onlyOwner()
external returns(bool) {
futureAddress = _futureAddress; // Allow 0
return true;
}
function setDefaultDistribution(uint8 stake, uint8 burn, uint8 dev, uint8 future)
onlyOwner()
external returns(bool) {
require(stake+burn+dev+future == 100, "StakeDevBurnTaxable: taxes must add to 100");
distribution = Distribution({ stake: stake, burn: burn, dev: dev, future: future });
}
/**
* @dev Can be called by anybody, but make this contract is tax exempt.
*/
function distributeTax(address token) external override returns(bool) {
IERC20 _token = IERC20(token);
return _distributeTax(_token, _token.balanceOf(address(this)));
}
function _distributeTax(IERC20 token, uint256 amount) internal returns(bool) {
Distribution memory dist = distribution;
uint256 remaining = amount;
if (dist.burn != 0) {
uint256 burnAmount = amount.mul(dist.burn).div(100);
if (burnAmount != 0) {
IERC20Burnable(address(token)).burn(burnAmount);
remaining = remaining.sub(burnAmount);
}
}
if (dist.dev != 0) {
uint256 devAmount = amount.mul(dist.dev).div(100);
if (devAmount != 0) {
token.transfer(devAddress, devAmount);
remaining = remaining.sub(devAmount);
}
}
if (dist.future != 0) {
uint256 futureAmount = amount.mul(dist.future).div(100);
if (futureAmount != 0) {
token.transfer(futureAddress, futureAmount);
remaining = remaining.sub(futureAmount);
}
}
if (dist.stake != 0) {
uint256 stakeAmount = remaining;
address stakeAddress = rewardDistributor.rollAndGetDistributionAddress(msg.sender);
if (stakeAddress != address(0)) {
token.transfer(stakeAddress, stakeAmount);
bool res = rewardDistributor.updateRewards(stakeAddress);
require(res, "StakeDevBurnTaxable: Error staking rewards");
}
}
return true;
}
}
// SPDX-License-Identifire: MIT
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./TaxDistributor.sol";
/**
* Allows taxation efficiently.
*/
abstract contract Taxable is ERC20Burnable, Ownable {
uint128 public _buffer = 20 * 10 ** 18; // Default to 20 tokens;
ITaxDistributor taxDistributor;
function updateBuffer(uint256 buffer) external onlyOwner returns (bool) {
require(buffer < 2 ** 127, "Taxable: Buffer too large");
_buffer = uint128(buffer);
}
function updateTaxDistributor(address _taxDistributor) external onlyOwner returns (bool) {
taxDistributor = ITaxDistributor(_taxDistributor);
return ITaxDistributor(_taxDistributor).distributeTax(address(this)); // Verify it works
}
function tax(address sender, uint256 amount) internal returns(bool) {
require(amount < 2 ** 127, "Taxable: Tax amount too large");
ITaxDistributor _taxDistributor = taxDistributor;
if (address(_taxDistributor) == address(0)) { return false; }
_transferWithoutTax(sender, address(_taxDistributor), amount);
uint256 buffer = _buffer;
uint256 taxAmount = balanceOf(address(_taxDistributor));
if (taxAmount >= buffer) {
return _taxDistributor.distributeTax(address(this));
}
return true;
}
function _transferWithoutTax(address sender, address recipient, uint256 amount) internal virtual;
}
pragma solidity >=0.6.0 <0.8.0;
interface ISafetyLocker {
function verifyTransfer(address source, address dest) external;
function verifyUserAddress(address user, uint256 amount) external;
function IsSafetyLocker() external pure returns(bool);
}
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/math/SafeMath.sol";
library LockLib {
enum LockType {
None, NoBurnPool, NoIn, NoOut, NoTransaction,
PenaltyOut, PenaltyIn, PenaltyInOrOut, Master, LiquidityAdder
}
struct TargetPolicy {
LockType lockType;
uint16 penaltyRateOver1000;
bool isPermanent;
}
}
pragma solidity >=0.6.0 <0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../../common/Constants.sol";
import "./LockLib.sol";
import "./ISafetyLocker.sol";
interface ILocker {
function syncLiquiditySupply(address pool) external;
/**
* @dev Fails if transaction is not allowed. Otherwise returns the penalty.
* Returns a bool and a uint16, bool clarifying the penalty applied, and uint16 the penaltyOver1000
*/
function lockOrGetPenalty(address source, address dest)
external
returns (bool, uint256);
}
interface ILockerUser {
function locker() external view returns (ILocker);
}
/**
* Owner can lock unlock temporarily, or make them permanent.
* It can also add penalty to certain activities.
* Addresses can be whitelisted or have different penalties.
* This must be inherited by the token itself.
*/
contract Locker is ILocker, Ownable {
// Putting all conditions in one mapping to prevent unnecessary lookup and save gas
mapping (address=>LockLib.TargetPolicy) locked;
mapping (address=>uint256) liquiditySupply;
address public mustUpdate;
address public safetyLocker;
function allowPool(address token1, address token2)
external onlyOwner() {
address pool = Constants.uniV2Factory.getPair(token1, token2);
if (pool == address(0)) {
pool = Constants.uniV2Factory.createPair(token1, token2);
}
// Pool will not be opened to public yet.
locked[pool].lockType = LockLib.LockType.NoTransaction;
liquiditySupply[pool] = IERC20(pool).totalSupply();
}
function getLockType(address target) external view returns(LockLib.LockType, uint16, bool) {
LockLib.TargetPolicy memory res = locked[target];
return (res.lockType, res.penaltyRateOver1000, res.isPermanent);
}
function setSafetyLocker(address _safetyLocker) external onlyOwner() {
safetyLocker = _safetyLocker;
if (safetyLocker != address(0)) {
require(ISafetyLocker(_safetyLocker).IsSafetyLocker(), "Bad safetyLocker");
}
}
/**
*/
function lockAddress(address target, LockLib.LockType lockType, uint16 penaltyRateOver1000, bool permanent)
external
onlyOwner()
returns(bool) {
require(target != address(0), "Locker: invalid target address");
require(!locked[target].isPermanent, "Locker: address lock is permanent");
locked[target].lockType = lockType;
locked[target].penaltyRateOver1000 = penaltyRateOver1000;
locked[target].isPermanent = permanent;
return true;
}
function multiBlackList(address[] calldata addresses) external onlyOwner() {
for(uint i=0; i < addresses.length; i++) {
locked[addresses[i]].lockType = LockLib.LockType.NoTransaction;
}
}
/**
* @dev Fails if transaction is not allowed. Otherwise returns the penalty.
* Returns a bool and a uint16, bool clarifying the penalty applied, and uint16 the penaltyOver1000
*/
function lockOrGetPenalty(address source, address dest) external override
returns (bool, uint256) {
LockLib.TargetPolicy memory sourcePolicy = locked[source];
LockLib.TargetPolicy memory destPolicy = locked[dest];
address mustUpdateAddress = mustUpdate;
bool overridePenalty = false;
if (mustUpdateAddress != address(0)) {
mustUpdate = address(0);
uint256 newSupply = IERC20(mustUpdateAddress).totalSupply();
if (newSupply > liquiditySupply[mustUpdateAddress]) {
liquiditySupply[mustUpdateAddress] = newSupply;
}
}
if (sourcePolicy.lockType == LockLib.LockType.Master || destPolicy.lockType == LockLib.LockType.Master) {
// if one side is a pool, update the mustUpdateAddress
if (destPolicy.lockType == LockLib.LockType.NoBurnPool) {
mustUpdate = dest;
}
return (true, 0);
}
require(sourcePolicy.lockType != LockLib.LockType.NoOut &&
sourcePolicy.lockType != LockLib.LockType.NoTransaction, "Locker: not allowed source");
require(destPolicy.lockType != LockLib.LockType.NoIn &&
destPolicy.lockType != LockLib.LockType.NoTransaction, "Locker: not allowed destination");
if (destPolicy.lockType == LockLib.LockType.NoBurnPool) {
mustUpdate = dest;
}
if (sourcePolicy.lockType == LockLib.LockType.NoBurnPool) {
require (IERC20(source).totalSupply() >= liquiditySupply[source], "Cannot remove liquidity");
}
uint256 sourcePenalty = 0;
if (sourcePolicy.lockType == LockLib.LockType.PenaltyOut ||
sourcePolicy.lockType == LockLib.LockType.PenaltyInOrOut) {
sourcePenalty = sourcePolicy.penaltyRateOver1000;
overridePenalty = true;
}
uint256 destPenalty = 0;
if (destPolicy.lockType == LockLib.LockType.PenaltyIn ||
destPolicy.lockType == LockLib.LockType.PenaltyInOrOut) {
destPenalty = destPolicy.penaltyRateOver1000;
overridePenalty = true;
}
if (safetyLocker != address(0)) {
ISafetyLocker(safetyLocker).verifyTransfer(source, dest);
}
return (overridePenalty, Math.max(sourcePenalty, destPenalty));
}
function syncLiquiditySupply(address pool) override
external {
LockLib.LockType state = locked[pool].lockType;
require(state != LockLib.LockType.None, "Locker: pool not defined");
LockLib.LockType senderState = locked[msg.sender].lockType;
require(senderState == LockLib.LockType.LiquidityAdder, "Locker: Only call from liquidity adder");
_syncLiquiditySupply(pool);
}
function _syncLiquiditySupply(address pool) internal {
liquiditySupply[pool] = IERC20(pool).totalSupply();
if (mustUpdate == pool) {
mustUpdate = address(0);
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/*
* @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.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../GSN/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(_owner == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Standard math utilities missing in the Solidity language.
*/
library Math {
/**
* @dev Returns the largest of two numbers.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256) {
return a >= b ? a : b;
}
/**
* @dev Returns the smallest of two numbers.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256) {
return a < b ? a : b;
}
/**
* @dev Returns the average of two numbers. The result is rounded towards
* zero.
*/
function average(uint256 a, uint256 b) internal pure returns (uint256) {
// (a + b) / 2 can overflow, so we distribute
return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
* @dev Implementation of the {IERC20} 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}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
using Address for address;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol) public {
_name = name;
_symbol = symbol;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
* called.
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20};
*
* Requirements:
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "../../GSN/Context.sol";
import "./ERC20.sol";
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
abstract contract ERC20Burnable is Context, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public virtual {
_burn(_msgSender(), amount);
}
/**
* @dev Destroys `amount` tokens from `account`, deducting from the caller's
* allowance.
*
* See {ERC20-_burn} and {ERC20-allowance}.
*
* Requirements:
*
* - the caller must have allowance for ``accounts``'s tokens of at least
* `amount`.
*/
function burnFrom(address account, uint256 amount) public virtual {
uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");
_approve(account, _msgSender(), decreasedAllowance);
_burn(account, amount);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function _callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.2;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies in extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return _functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
return _functionCallWithValue(target, data, value, errorMessage);
}
function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
pragma solidity >=0.5.0;
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
pragma solidity >=0.6.2;
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
pragma solidity >=0.6.2;
import './IUniswapV2Router01.sol';
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}