Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./lib/ERC20Presaleable.sol";
import "./lib/ERC20Vestable.sol";
import "./lib/ERC20Burnable.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
contract ApeToken is ERC20Burnable, ERC20Vestable, ERC20Presaleable {
IUniswapV2Router02 private router;
uint256 public constant MAX_INT = uint256(-1);
uint256 public stakingPoolDateAdd;
address public stakingPoolPending;
address
public constant UNISWAP_ROUTER_ADDRESS = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
event LiquidityAdded(
uint256 amountToken,
uint256 amountEth,
uint256 liquidity
);
event DeveloperAddedPendingPool(address pendingPool);
event DeveloperAddedPool(address pool);
constructor(
address payable secondDeveloper,
address[] memory stakingPools,
address marketing,
uint256 presaleCap,
address[] memory supporters,
uint256[] memory supporterRewards
)
public
ERC20("Ape.cash V2", "APEv2")
RoleAware(msg.sender, stakingPools)
ERC20Presaleable(presaleCap)
{
// number of tokens is vested over 3 months, see ERC20Vestable
_addBeneficiary(msg.sender, 105000, 10 days, true);
_addBeneficiary(secondDeveloper, 45000, 10 days, true);
_addBeneficiary(marketing, 50000, 10 days, true);
router = IUniswapV2Router02(UNISWAP_ROUTER_ADDRESS);
for (uint256 index = 0; index < supporters.length; index++) {
_mint(supporters[index], supporterRewards[index]);
}
}
// developer can add staking pools. as these can mint, function is timelocked for 24 hours
function addStakingPoolConfirm() public onlyDeveloper {
require(now >= stakingPoolDateAdd.add(24 hours));
grantRole(STAKING_POOL_ROLE, stakingPoolPending);
grantRole(WHITELIST_ROLE, stakingPoolPending);
emit DeveloperAddedPool(stakingPoolPending);
}
function addStakingPoolInitial(address stakingPool) public onlyDeveloper {
stakingPoolDateAdd = now;
stakingPoolPending = stakingPool;
emit DeveloperAddedPendingPool(stakingPool);
}
// allow contracts with role ape staking pool to mint rewards for users
function mint(address to, uint256 amount)
public
onlyStakingPool
nonReentrant
{
if (totalSupply() <= maximumSupply) {
_mint(to, amount);
}
}
function listOnUniswap() public onlyDeveloper {
// mint 1800 APE per held ETH to list on Uniswap
setTradeable();
timeListed = now;
addWhitelist(UNISWAP_ROUTER_ADDRESS);
addWhitelist(uniswapEthPair);
uint256 ethBalance = address(this).balance;
uint256 apeBalance = ethBalance.mul(uniswapApePerEth);
_mint(address(this), apeBalance);
_approve(address(this), address(router), apeBalance);
(uint256 amountToken, uint256 amountEth, uint256 liquidity) = router
.addLiquidityETH{value: ethBalance}(
address(this),
apeBalance,
apeBalance,
ethBalance,
address(0),
block.timestamp + uint256(5).mul(1 minutes)
);
revokeRole(WHITELIST_ROLE, uniswapEthPair);
revokeRole(WHITELIST_ROLE, UNISWAP_ROUTER_ADDRESS);
addWhitelistFrom(uniswapEthPair);
stopPresale();
uniswapPairImpl = IUniswapV2Pair(uniswapEthPair);
emit LiquidityAdded(amountToken, amountEth, liquidity);
}
function empty() public nonReentrant onlyDeveloper {
_developer.transfer(address(this).balance);
}
function transfer(address recipient, uint256 amount)
public
override(ERC20Burnable, ERC20)
returns (bool)
{
return ERC20Burnable.transfer(recipient, amount);
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public override(ERC20Burnable, ERC20) returns (bool) {
return ERC20Burnable.transferFrom(sender, recipient, amount);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./RoleAware.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
abstract contract ERC20Burnable is RoleAware, ERC20 {
uint256 public minimumSupply = 20000 * (10**18);
uint256 public maximumSupply = 5000000 * (10**18);
uint256 private constant roughDay = 60 * 60 * 24;
uint256 public timeListed = 0;
bool public tradeable = false;
// address of giveth, an on-chain charity
address
public constant GIVETH_ADDRESS = 0x8f951903C9360345B4e1b536c7F5ae8f88A64e79;
function _partialBurn(
uint256 amount,
address recipient,
address sender
) internal returns (uint256) {
if (anyWhitelisted(sender, recipient)) {
return amount;
} else if (!tradeable) {
revert("token is not yet tradeable");
}
uint256 burnAmount = calculateBurnAmount(amount, recipient, sender);
if (burnAmount > 0) {
_burn(sender, burnAmount);
_mint(GIVETH_ADDRESS, burnAmount.div(25));
_mint(_developer, burnAmount.div(25));
}
return amount.sub(burnAmount);
}
function calculateBurnAmount(
uint256 amount,
address recipient,
address sender
) public view returns (uint256) {
uint256 burnAmount = 0;
uint256 burnPercentage = 0;
if (timeListed != 0) {
uint256 sinceLaunch = now.add(1).sub(timeListed.add(1));
uint256 daysSinceLaunch = sinceLaunch.div(roughDay);
if (daysSinceLaunch > 10) {
burnPercentage = 5;
} else {
burnPercentage = uint256(12).sub(daysSinceLaunch);
}
}
if (totalSupply() > minimumSupply) {
burnAmount = amount.mul(burnPercentage).div(100);
uint256 availableBurn = totalSupply().sub(minimumSupply);
if (burnAmount > availableBurn) {
burnAmount = availableBurn;
}
}
return burnAmount;
}
function transfer(address recipient, uint256 amount)
public
virtual
override
returns (bool)
{
return
super.transfer(
recipient,
_partialBurn(amount, recipient, msg.sender)
);
}
function transferFrom(
address sender,
address recipient,
uint256 amount
) public virtual override returns (bool) {
return
super.transferFrom(
sender,
recipient,
_partialBurn(amount, recipient, sender)
);
}
function setTradeable() public onlyDeveloper {
require(tradeable == false);
tradeable = true;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./RoleAware.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
abstract contract ERC20Presaleable is RoleAware, ReentrancyGuard, ERC20 {
bool public isPresale = false;
uint256 public presaleApePerEther = 2500;
uint256 public uniswapApePerEth = 1800;
uint256 public presaleEtherReceived = 0 ether;
uint256 public maxPresaleEtherValue;
uint256 internal _minTokenPurchaseAmount = .1 ether;
uint256 internal _maxTokenPurchaseAmount = 1.5 ether;
mapping(address => bool) private _whitelisted;
mapping(address => uint256) public presaleContributions;
event PresalePurchased(address buyer, uint256 entitlement, uint256 weiContributed);
constructor(uint256 maxPresaleValue) public {
maxPresaleEtherValue = maxPresaleValue.mul(1 ether);
presaleContributions[0x0799442CE0f90F8837fdeEce82Cd2735625B4bf9] = 3750000000000000000000;
presaleContributions[0xD6dBed6297B539A11f1aAb7907e7DF7d9FFeda7e] = 3750000000000000000000;
presaleContributions[0x5EDd81949604C74E984Ee3424a72C6733df463D3] = 2500000000000000000000;
presaleContributions[0x43949405198B10A385959b3F53749F9267b3E3e6] = 3750000000000000000000;
presaleContributions[0x48e4dd3e356823070D9d1B7d162d072aE9EFE0Cb] = 3750000000000000000000;
presaleContributions[0x74DB48886b32E2dF80F6Be50f22bBFE3FCDE007d] = 2500000000000000000000;
presaleContributions[0xFCbaA5Cbf122f8e7557Fd82d79151Ac11e73a6D3] = 3750000000000000000000;
presaleContributions[0xf0F0f6658EeBF2683DEA8377B88313Dfb92cFF93] = 3750000000000000000000;
presaleContributions[0x06e8BBeeA67358a4325978e075F411dee2430A40] = 3750000000000000000000;
presaleContributions[0xE2008Ef79a7d0D75EdAE70263384D4aC5D1A9f9A] = 3750000000000000000000;
presaleContributions[0x78024ea589A845Fb72f285371901614BAA04C168] = 3750000000000000000000;
presaleContributions[0x4566b0876362B920f0b64e2d843330Df2b411ca8] = 3750000000000000000000;
presaleContributions[0xdbC2E36941De2a4724EbfD25098c44B8F1ce476D] = 3750000000000000000000;
presaleContributions[0x7329Dd949aA536E23e0a8962F5829c8a3c24b805] = 3750000000000000000000;
presaleContributions[0xeA5DcA8cAc9c12Df3AB5908A106c15ff024CB44F] = 3750000000000000000000;
presaleContributions[0xb7fc44237eE35D7b533037cbA2298E54c3d59276] = 3750000000000000000000;
presaleContributions[0x49Dd2aEf2d93aB30b674E9F380AD781F820872A4] = 3250000000000000000000;
presaleContributions[0x4D12D1148e295d09E77E8c7474E35f680EE8fD74] = 3750000000000000000000;
presaleContributions[0x5eE42438d0D8fc399C94ef3543665E993e847b49] = 3750000000000000000000;
presaleContributions[0xCd497374cc72c57c632917D365eeF8f74DBef891] = 3750000000000000000000;
presaleContributions[0x5eD48eCbE5ea89720f21147080e7088fA6a8fC0D] = 3750000000000000000000;
presaleContributions[0x59129bE4E238cf2308B2fa294E6655511cc266F3] = 3750000000000000000000;
presaleContributions[0x432CDdF90755a2C034c94d8590298D134590169f] = 375000000000000000000;
presaleContributions[0x74A8eA33e8Ac1259208eBa5f9688e44B501B9a28] = 1250000000000000000000;
presaleContributions[0x8146744BaCD5d9AeF17c3ea250589f235CcD3fa9] = 3750000000000000000000;
presaleContributions[0xA43c750d5dE3Bd88EE4F35DEF72Cf76afEbeC274] = 3750000000000000000000;
presaleContributions[0xcA7F8f6A21C6e0F3b0177207407Fc935429BdD27] = 3750000000000000000000;
presaleContributions[0x990225C71d9FF1886988646F97C07fd2a5476345] = 1750000000000000000000;
presaleContributions[0xd99E28EF233B2B61020927E85Bf89d4bba7e07dF] = 3750000000000000000000;
presaleContributions[0xb3b8273d4088F9a94B58367BE7Fe6Dd136c9340B] = 3750000000000000000000;
presaleContributions[0x49Bb576c68Ce2334294e46D1Ffec31bC57a0CeD7] = 3750000000000000000000;
presaleContributions[0x731C0eBB22596924611d78CF00aD5848e80F3792] = 3750000000000000000000;
presaleContributions[0x015F2E9c1Da633C9A41Bce61B67f185035B87f38] = 3750000000000000000000;
presaleContributions[0xD329dd0BCD0d7CABD40Bc00380AFe8934E3FF36d] = 3750000000000000000000;
presaleContributions[0xd0c8e2F3b9f194c39867A18eD8fe646a30d15c75] = 2000000000000000000000;
presaleContributions[0x9059B7c20390161aF7A8fD2aAc21f1b9ac7b22BE] = 3750000000000000000000;
presaleContributions[0x6dD064d9DE98C1E19045C3D674e336a6d3aC3A80] = 3250000000000000000000;
presaleContributions[0xa680820b3F0bBc830D23859be54A42927c0e699d] = 3750000000000000000000;
presaleContributions[0xE94D448083dFd5FEafb629Ff1d546aE2BD189783] = 3750000000000000000000;
presaleContributions[0x9cd8C2A7B6ab2174848d4FC2f1D886c62f21351F] = 3750000000000000000000;
presaleContributions[0x99C87707f324e42c2B09A4A7c5Da78D50f42bdE6] = 750000000000000000000;
presaleContributions[0xBBB62D3C86aB4c654e69E292b69c1987D7c6F35B] = 3750000000000000000000;
presaleContributions[0xfEAb408a2e63A6c55b7C65D272a095629d216725] = 3750000000000000000000;
presaleContributions[0x10A096f045c328bDE78C59d2bf4a45360c93fD3E] = 3750000000000000000000;
presaleContributions[0x92048DB9D572F3D153d415A41502aD20e9756904] = 3750000000000000000000;
presaleContributions[0x1E46Fc7c886aAcfB46d774d2281C0a64747Fd50a] = 3750000000000000000000;
presaleContributions[0x31E1f0ae62C4C5a0A08dF32472cc6825B9d6d59f] = 3750000000000000000000;
presaleContributions[0x641d35823e1342b5d7B541b1c701c3d4A41F82ad] = 3750000000000000000000;
presaleContributions[0x154cd60Ba9bE36c660Aab7D4CadcfA95fE1930aC] = 3750000000000000000000;
presaleContributions[0x86C9a1624746fCaEFaA1773E503b701417427F8b] = 3750000000000000000000;
presaleContributions[0xd03A083589edC2aCcf09593951dCf000475cc9f2] = 3750000000000000000000;
presaleContributions[0xB888dAeDbB2709a5052793A587758973Cf63A503] = 2500000000000000000000;
presaleContributions[0xe2068FdC209b55bCc165E5f64f97A3119323F617] = 3750000000000000000000;
presaleContributions[0x5EDd81949604C74E984Ee3424a72C6733df463D3] = 3750000000000000000000;
presaleContributions[0x190c0eCCCB2796Df51FF90b900007fe980975f7A] = 3750000000000000000000;
}
modifier onlyDuringPresale() {
require(isPresale == true || _whitelisted[msg.sender], "The presale is not active");
_;
}
modifier onlyBeforePresale() {
require(isPresale == false);
_;
}
function stopPresale() public onlyDeveloper onlyDuringPresale {
isPresale = false;
}
function startPresale() public onlyDeveloper {
isPresale = true;
}
function addPresaleWhitelist(address buyer) public onlyDeveloper {
_whitelisted[buyer] = true;
}
function presale()
public
payable
onlyDuringPresale
nonReentrant
returns (bool)
{
require(
msg.value >= _minTokenPurchaseAmount,
"Minimum purchase amount not met"
);
require(
presaleEtherReceived.add(msg.value) <= maxPresaleEtherValue || _whitelisted[msg.sender],
"Presale maximum already achieved"
);
require(
presaleContributions[msg.sender].add(msg.value.mul(presaleApePerEther)) <=
_maxTokenPurchaseAmount.mul(presaleApePerEther),
"Amount of ether sent too high"
);
presaleContributions[msg.sender] = presaleContributions[msg.sender].add(msg.value.mul(presaleApePerEther));
if (!_whitelisted[msg.sender]) {
presaleEtherReceived = presaleEtherReceived.add(msg.value);
}
emit PresalePurchased(msg.sender, presaleContributions[msg.sender], msg.value);
_developer.transfer(msg.value.mul(3).div(10));
}
function _getPresaleEntitlement() internal returns (uint256) {
require(
presaleContributions[msg.sender] >= 0,
"No presale contribution or already redeemed"
);
uint256 value = presaleContributions[msg.sender];
presaleContributions[msg.sender] = 0;
return value;
}
// presale funds only claimable after uniswap pair created to prevent malicious 3rd-party listing
function claimPresale()
public
nonReentrant
returns (bool)
{
uint256 result = _getPresaleEntitlement();
if (result > 0) {
_mint(msg.sender, result);
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "./RoleAware.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
abstract contract ERC20Vestable is RoleAware, ERC20 {
uint256 public vestingTime = 4 days;
bool public canAddVesters = true;
function setVestingTime(uint256 newTime) public onlyDeveloper {
vestingTime = newTime;
}
// tokens vest 10% every n days. `claimFunds` can be called once every n days
struct VestingAllowance {
uint256 frequency;
uint256 allowance;
uint256 claimAmount;
uint256 lastClaimed;
}
mapping(address => VestingAllowance) public vestingAllowances;
function _grantFunds(address beneficiary) internal {
VestingAllowance memory userAllowance = vestingAllowances[beneficiary];
require(
userAllowance.allowance > 0 &&
userAllowance.allowance >= userAllowance.claimAmount,
"Entire allowance already claimed, or no initial allowance"
);
userAllowance.allowance = userAllowance.allowance.sub(userAllowance.claimAmount);
vestingAllowances[beneficiary] = userAllowance;
_mint(beneficiary, userAllowance.claimAmount.mul(10**uint256(decimals())));
}
// internal function only ever called from constructor
function _addBeneficiary(
address beneficiary,
uint256 amount,
uint256 claimFrequency,
bool grant
) internal {
vestingAllowances[beneficiary] = VestingAllowance(
claimFrequency,
amount,
amount.div(10),
now
);
// beneficiary gets 10% of funds immediately
if (grant) {
_grantFunds(beneficiary);
}
}
function claimFunds() public {
VestingAllowance memory allowance = vestingAllowances[msg.sender];
require(
allowance.lastClaimed != 0 &&
(now >= allowance.lastClaimed.add(allowance.frequency) || now >= allowance.lastClaimed.add(vestingTime)),
"Allowance already claimed for this time period"
);
allowance.lastClaimed = now;
vestingAllowances[msg.sender] = allowance;
_grantFunds(msg.sender);
}
// function callable before uinswap listing to allow v1 holders to be compensated
function addV1Beneficiary(address[] memory addresses, uint256[] memory amounts, uint256[] memory period)
public
onlyDeveloper
{
require(canAddVesters == true);
for (uint256 index = 0; index < addresses.length; index++) {
_addBeneficiary(addresses[index], amounts[index], period[index], false);
}
}
function renounceVesting() public onlyDeveloper {
canAddVesters = false;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "./UniswapAware.sol";
contract RoleAware is AccessControl, UniswapAware {
bytes32 public constant STAKING_POOL_ROLE = keccak256("STAKING_POOL_ROLE");
bytes32 public constant WHITELIST_ROLE = keccak256("WHITELIST_ROLE");
bytes32 public constant WHITELIST_TO_ROLE = keccak256("WHITELIST_TO_ROLE");
bytes32 public constant WHITELIST_FROM_ROLE =
keccak256("WHITELIST_FROM_ROLE");
bytes32 public constant DEVELOPER_ROLE = keccak256("DEVELOPER_ROLE");
address payable public _developer;
constructor(address payable developer, address[] memory stakingPools)
public
{
_developer = developer;
_setupRole(DEVELOPER_ROLE, _developer);
_setupRole(DEFAULT_ADMIN_ROLE, _developer);
grantRole(WHITELIST_ROLE, address(this));
// O(n) iteration allowed as stakingPools will contain very few items
for (uint256 i = 0; i < stakingPools.length; i++) {
grantRole(STAKING_POOL_ROLE, stakingPools[i]);
grantRole(WHITELIST_ROLE, stakingPools[i]);
}
}
modifier onlyDeveloper() {
require(hasRole(DEVELOPER_ROLE, msg.sender), "Caller is not developer");
_;
}
// distinct from external staking pools, Ape staking pools can mint rewards for users
modifier onlyStakingPool() {
require(
hasRole(STAKING_POOL_ROLE, msg.sender),
"Caller is not a staking pool"
);
_;
}
// needed to add new external liquidity pools - pools should not be burned by default
function addWhitelist(address grantee) public onlyDeveloper {
grantRole(WHITELIST_ROLE, grantee);
}
function addWhitelistTo(address grantee) public onlyDeveloper {
grantRole(WHITELIST_TO_ROLE, grantee);
}
function addWhitelistFrom(address grantee) public onlyDeveloper {
grantRole(WHITELIST_FROM_ROLE, grantee);
}
function anyWhitelisted(address sender, address recipient)
internal
view
returns (bool)
{
return (hasRole(WHITELIST_ROLE, sender) ||
hasRole(WHITELIST_ROLE, recipient) ||
hasRole(WHITELIST_ROLE, msg.sender) ||
hasRole(WHITELIST_TO_ROLE, recipient) ||
hasRole(WHITELIST_FROM_ROLE, sender));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;
import "@uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol";
contract UniswapAware {
address public uniswapEthPair;
IUniswapV2Pair public uniswapPairImpl;
function isContract(address _addr) internal view returns (bool) {
uint32 size;
assembly {
size := extcodesize(_addr)
}
return (size > 0);
}
constructor() public {
uniswapEthPair = pairFor(
0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f,
0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2,
address(this)
);
}
function pairFor(
address factory,
address tokenA,
address tokenB
) public pure returns (address pair) {
(address token0, address token1) =
tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
pair = address(
uint256(
keccak256(
abi.encodePacked(
hex"ff",
factory,
keccak256(abi.encodePacked(token0, token1)),
hex"96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f"
)
)
)
);
}
modifier onlyAfterUniswap() {
_;
}
modifier onlyBeforeUniswap() {
_;
}
}
// 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 "../utils/EnumerableSet.sol";
import "../utils/Address.sol";
import "../GSN/Context.sol";
/**
* @dev Contract module that allows children to implement role-based access
* control mechanisms.
*
* Roles are referred to by their `bytes32` identifier. These should be exposed
* in the external API and be unique. The best way to achieve this is by
* using `public constant` hash digests:
*
* ```
* bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
* ```
*
* Roles can be used to represent a set of permissions. To restrict access to a
* function call, use {hasRole}:
*
* ```
* function foo() public {
* require(hasRole(MY_ROLE, msg.sender));
* ...
* }
* ```
*
* Roles can be granted and revoked dynamically via the {grantRole} and
* {revokeRole} functions. Each role has an associated admin role, and only
* accounts that have a role's admin role can call {grantRole} and {revokeRole}.
*
* By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
* that only accounts with this role will be able to grant or revoke other
* roles. More complex role relationships can be created by using
* {_setRoleAdmin}.
*
* WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
* grant and revoke this role. Extra precautions should be taken to secure
* accounts that have been granted it.
*/
abstract contract AccessControl is Context {
using EnumerableSet for EnumerableSet.AddressSet;
using Address for address;
struct RoleData {
EnumerableSet.AddressSet members;
bytes32 adminRole;
}
mapping (bytes32 => RoleData) private _roles;
bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
/**
* @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
*
* `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
* {RoleAdminChanged} not being emitted signaling this.
*
* _Available since v3.1._
*/
event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
/**
* @dev Emitted when `account` is granted `role`.
*
* `sender` is the account that originated the contract call, an admin role
* bearer except when using {_setupRole}.
*/
event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Emitted when `account` is revoked `role`.
*
* `sender` is the account that originated the contract call:
* - if using `revokeRole`, it is the admin role bearer
* - if using `renounceRole`, it is the role bearer (i.e. `account`)
*/
event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) public view returns (bool) {
return _roles[role].members.contains(account);
}
/**
* @dev Returns the number of accounts that have `role`. Can be used
* together with {getRoleMember} to enumerate all bearers of a role.
*/
function getRoleMemberCount(bytes32 role) public view returns (uint256) {
return _roles[role].members.length();
}
/**
* @dev Returns one of the accounts that have `role`. `index` must be a
* value between 0 and {getRoleMemberCount}, non-inclusive.
*
* Role bearers are not sorted in any particular way, and their ordering may
* change at any point.
*
* WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
* you perform all queries on the same block. See the following
* https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
* for more information.
*/
function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
return _roles[role].members.at(index);
}
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) public view returns (bytes32) {
return _roles[role].adminRole;
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function grantRole(bytes32 role, address account) public virtual {
require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");
_grantRole(role, account);
}
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*/
function revokeRole(bytes32 role, address account) public virtual {
require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");
_revokeRole(role, account);
}
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been granted `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*/
function renounceRole(bytes32 role, address account) public virtual {
require(account == _msgSender(), "AccessControl: can only renounce roles for self");
_revokeRole(role, account);
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event. Note that unlike {grantRole}, this function doesn't perform any
* checks on the calling account.
*
* [WARNING]
* ====
* This function should only be called from the constructor when setting
* up the initial roles for the system.
*
* Using this function in any other way is effectively circumventing the admin
* system imposed by {AccessControl}.
* ====
*/
function _setupRole(bytes32 role, address account) internal virtual {
_grantRole(role, account);
}
/**
* @dev Sets `adminRole` as ``role``'s admin role.
*
* Emits a {RoleAdminChanged} event.
*/
function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
_roles[role].adminRole = adminRole;
}
function _grantRole(bytes32 role, address account) private {
if (_roles[role].members.add(account)) {
emit RoleGranted(role, account, _msgSender());
}
}
function _revokeRole(bytes32 role, address account) private {
if (_roles[role].members.remove(account)) {
emit RoleRevoked(role, account, _msgSender());
}
}
}
// 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;
/**
* @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 ^0.6.2;
/**
* @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);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
* (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping (bytes32 => uint256) _indexes;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._indexes[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We read and store the value's index to prevent multiple reads from the same storage slot
uint256 valueIndex = set._indexes[value];
if (valueIndex != 0) { // Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = valueIndex - 1;
uint256 lastIndex = set._values.length - 1;
// When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
bytes32 lastvalue = set._values[lastIndex];
// Move the last value to the index where the value to delete is
set._values[toDeleteIndex] = lastvalue;
// Update the index for the moved value
set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the index for the deleted slot
delete set._indexes[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
require(set._values.length > index, "EnumerableSet: index out of bounds");
return set._values[index];
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(value)));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint256(_at(set._inner, index)));
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () internal {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
pragma solidity >=0.5.0;
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Mint(address indexed sender, uint amount0, uint amount1);
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, 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;
}