Overview
Max Total Supply
25,229.147162754530617984 xGRAIL
Holders
41,774 ( -0.002%)
Market
Price
$0.00 @ 0.000000 ETH
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Filtered by Token Holder
Pendle: SY-ARB-GRAIL_Camelot TokenBalance
0 xGRAILValue
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Contract Name:
XGrailToken
Compiler Version
v0.7.6+commit.7338295f
Optimization Enabled:
Yes with 50000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity =0.7.6; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/math/SafeMath.sol"; import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/utils/ReentrancyGuard.sol"; import "@openzeppelin/contracts/utils/EnumerableSet.sol"; import "./interfaces/tokens/IGrailTokenV2.sol"; import "./interfaces/tokens/IXGrailToken.sol"; import "./interfaces/IXGrailTokenUsage.sol"; /* * xGRAIL is Camelot's escrowed governance token obtainable by converting GRAIL to it * It's non-transferable, except from/to whitelisted addresses * It can be converted back to GRAIL through a vesting process * This contract is made to receive xGRAIL deposits from users in order to allocate them to Usages (plugins) contracts */ contract XGrailToken is Ownable, ReentrancyGuard, ERC20("Camelot escrowed token", "xGRAIL"), IXGrailToken { using Address for address; using SafeMath for uint256; using EnumerableSet for EnumerableSet.AddressSet; using SafeERC20 for IGrailTokenV2; struct XGrailBalance { uint256 allocatedAmount; // Amount of xGRAIL allocated to a Usage uint256 redeemingAmount; // Total amount of xGRAIL currently being redeemed } struct RedeemInfo { uint256 grailAmount; // GRAIL amount to receive when vesting has ended uint256 xGrailAmount; // xGRAIL amount to redeem uint256 endTime; IXGrailTokenUsage dividendsAddress; uint256 dividendsAllocation; // Share of redeeming xGRAIL to allocate to the Dividends Usage contract } IGrailTokenV2 public immutable grailToken; // GRAIL token to convert to/from IXGrailTokenUsage public dividendsAddress; // Camelot dividends contract EnumerableSet.AddressSet private _transferWhitelist; // addresses allowed to send/receive xGRAIL mapping(address => mapping(address => uint256)) public usageApprovals; // Usage approvals to allocate xGRAIL mapping(address => mapping(address => uint256)) public override usageAllocations; // Active xGRAIL allocations to usages uint256 public constant MAX_DEALLOCATION_FEE = 200; // 2% mapping(address => uint256) public usagesDeallocationFee; // Fee paid when deallocating xGRAIL uint256 public constant MAX_FIXED_RATIO = 100; // 100% // Redeeming min/max settings uint256 public minRedeemRatio = 50; // 1:0.5 uint256 public maxRedeemRatio = 100; // 1:1 uint256 public minRedeemDuration = 15 days; // 1296000s uint256 public maxRedeemDuration = 90 days; // 7776000s // Adjusted dividends rewards for redeeming xGRAIL uint256 public redeemDividendsAdjustment = 50; // 50% mapping(address => XGrailBalance) public xGrailBalances; // User's xGRAIL balances mapping(address => RedeemInfo[]) public userRedeems; // User's redeeming instances constructor(IGrailTokenV2 grailToken_) { grailToken = grailToken_; _transferWhitelist.add(address(this)); } /********************************************/ /****************** EVENTS ******************/ /********************************************/ event ApproveUsage(address indexed userAddress, address indexed usageAddress, uint256 amount); event Convert(address indexed from, address to, uint256 amount); event UpdateRedeemSettings(uint256 minRedeemRatio, uint256 maxRedeemRatio, uint256 minRedeemDuration, uint256 maxRedeemDuration, uint256 redeemDividendsAdjustment); event UpdateDividendsAddress(address previousDividendsAddress, address newDividendsAddress); event UpdateDeallocationFee(address indexed usageAddress, uint256 fee); event SetTransferWhitelist(address account, bool add); event Redeem(address indexed userAddress, uint256 xGrailAmount, uint256 grailAmount, uint256 duration); event FinalizeRedeem(address indexed userAddress, uint256 xGrailAmount, uint256 grailAmount); event CancelRedeem(address indexed userAddress, uint256 xGrailAmount); event UpdateRedeemDividendsAddress(address indexed userAddress, uint256 redeemIndex, address previousDividendsAddress, address newDividendsAddress); event Allocate(address indexed userAddress, address indexed usageAddress, uint256 amount); event Deallocate(address indexed userAddress, address indexed usageAddress, uint256 amount, uint256 fee); /***********************************************/ /****************** MODIFIERS ******************/ /***********************************************/ /* * @dev Check if a redeem entry exists */ modifier validateRedeem(address userAddress, uint256 redeemIndex) { require(redeemIndex < userRedeems[userAddress].length, "validateRedeem: redeem entry does not exist"); _; } /**************************************************/ /****************** PUBLIC VIEWS ******************/ /**************************************************/ /* * @dev Returns user's xGRAIL balances */ function getXGrailBalance(address userAddress) external view returns (uint256 allocatedAmount, uint256 redeemingAmount) { XGrailBalance storage balance = xGrailBalances[userAddress]; return (balance.allocatedAmount, balance.redeemingAmount); } /* * @dev returns redeemable GRAIL for "amount" of xGRAIL vested for "duration" seconds */ function getGrailByVestingDuration(uint256 amount, uint256 duration) public view returns (uint256) { if(duration < minRedeemDuration) { return 0; } // capped to maxRedeemDuration if (duration > maxRedeemDuration) { return amount.mul(maxRedeemRatio).div(100); } uint256 ratio = minRedeemRatio.add( (duration.sub(minRedeemDuration)).mul(maxRedeemRatio.sub(minRedeemRatio)) .div(maxRedeemDuration.sub(minRedeemDuration)) ); return amount.mul(ratio).div(100); } /** * @dev returns quantity of "userAddress" pending redeems */ function getUserRedeemsLength(address userAddress) external view returns (uint256) { return userRedeems[userAddress].length; } /** * @dev returns "userAddress" info for a pending redeem identified by "redeemIndex" */ function getUserRedeem(address userAddress, uint256 redeemIndex) external view validateRedeem(userAddress, redeemIndex) returns (uint256 grailAmount, uint256 xGrailAmount, uint256 endTime, address dividendsContract, uint256 dividendsAllocation) { RedeemInfo storage _redeem = userRedeems[userAddress][redeemIndex]; return (_redeem.grailAmount, _redeem.xGrailAmount, _redeem.endTime, address(_redeem.dividendsAddress), _redeem.dividendsAllocation); } /** * @dev returns approved xGrail to allocate from "userAddress" to "usageAddress" */ function getUsageApproval(address userAddress, address usageAddress) external view returns (uint256) { return usageApprovals[userAddress][usageAddress]; } /** * @dev returns allocated xGrail from "userAddress" to "usageAddress" */ function getUsageAllocation(address userAddress, address usageAddress) external view returns (uint256) { return usageAllocations[userAddress][usageAddress]; } /** * @dev returns length of transferWhitelist array */ function transferWhitelistLength() external view returns (uint256) { return _transferWhitelist.length(); } /** * @dev returns transferWhitelist array item's address for "index" */ function transferWhitelist(uint256 index) external view returns (address) { return _transferWhitelist.at(index); } /** * @dev returns if "account" is allowed to send/receive xGRAIL */ function isTransferWhitelisted(address account) external override view returns (bool) { return _transferWhitelist.contains(account); } /*******************************************************/ /****************** OWNABLE FUNCTIONS ******************/ /*******************************************************/ /** * @dev Updates all redeem ratios and durations * * Must only be called by owner */ function updateRedeemSettings(uint256 minRedeemRatio_, uint256 maxRedeemRatio_, uint256 minRedeemDuration_, uint256 maxRedeemDuration_, uint256 redeemDividendsAdjustment_) external onlyOwner { require(minRedeemRatio_ <= maxRedeemRatio_, "updateRedeemSettings: wrong ratio values"); require(minRedeemDuration_ < maxRedeemDuration_, "updateRedeemSettings: wrong duration values"); // should never exceed 100% require(maxRedeemRatio_ <= MAX_FIXED_RATIO && redeemDividendsAdjustment_ <= MAX_FIXED_RATIO, "updateRedeemSettings: wrong ratio values"); minRedeemRatio = minRedeemRatio_; maxRedeemRatio = maxRedeemRatio_; minRedeemDuration = minRedeemDuration_; maxRedeemDuration = maxRedeemDuration_; redeemDividendsAdjustment = redeemDividendsAdjustment_; emit UpdateRedeemSettings(minRedeemRatio_, maxRedeemRatio_, minRedeemDuration_, maxRedeemDuration_, redeemDividendsAdjustment_); } /** * @dev Updates dividends contract address * * Must only be called by owner */ function updateDividendsAddress(IXGrailTokenUsage dividendsAddress_) external onlyOwner { // if set to 0, also set divs earnings while redeeming to 0 if(address(dividendsAddress_) == address(0)) { redeemDividendsAdjustment = 0; } emit UpdateDividendsAddress(address(dividendsAddress), address(dividendsAddress_)); dividendsAddress = dividendsAddress_; } /** * @dev Updates fee paid by users when deallocating from "usageAddress" */ function updateDeallocationFee(address usageAddress, uint256 fee) external onlyOwner { require(fee <= MAX_DEALLOCATION_FEE, "updateDeallocationFee: too high"); usagesDeallocationFee[usageAddress] = fee; emit UpdateDeallocationFee(usageAddress, fee); } /** * @dev Adds or removes addresses from the transferWhitelist */ function updateTransferWhitelist(address account, bool add) external onlyOwner { require(account != address(this), "updateTransferWhitelist: Cannot remove xGrail from whitelist"); if(add) _transferWhitelist.add(account); else _transferWhitelist.remove(account); emit SetTransferWhitelist(account, add); } /*****************************************************************/ /****************** EXTERNAL PUBLIC FUNCTIONS ******************/ /*****************************************************************/ /** * @dev Approves "usage" address to get allocations up to "amount" of xGRAIL from msg.sender */ function approveUsage(IXGrailTokenUsage usage, uint256 amount) external nonReentrant { require(address(usage) != address(0), "approveUsage: approve to the zero address"); usageApprovals[msg.sender][address(usage)] = amount; emit ApproveUsage(msg.sender, address(usage), amount); } /** * @dev Convert caller's "amount" of GRAIL to xGRAIL */ function convert(uint256 amount) external nonReentrant { _convert(amount, msg.sender); } /** * @dev Convert caller's "amount" of GRAIL to xGRAIL to "to" address */ function convertTo(uint256 amount, address to) external override nonReentrant { require(address(msg.sender).isContract(), "convertTo: not allowed"); _convert(amount, to); } /** * @dev Initiates redeem process (xGRAIL to GRAIL) * * Handles dividends' compensation allocation during the vesting process if needed */ function redeem(uint256 xGrailAmount, uint256 duration) external nonReentrant { require(xGrailAmount > 0, "redeem: xGrailAmount cannot be null"); require(duration >= minRedeemDuration, "redeem: duration too low"); _transfer(msg.sender, address(this), xGrailAmount); XGrailBalance storage balance = xGrailBalances[msg.sender]; // get corresponding GRAIL amount uint256 grailAmount = getGrailByVestingDuration(xGrailAmount, duration); emit Redeem(msg.sender, xGrailAmount, grailAmount, duration); // if redeeming is not immediate, go through vesting process if(duration > 0) { // add to SBT total balance.redeemingAmount = balance.redeemingAmount.add(xGrailAmount); // handle dividends during the vesting process uint256 dividendsAllocation = xGrailAmount.mul(redeemDividendsAdjustment).div(100); // only if compensation is active if(dividendsAllocation > 0) { // allocate to dividends dividendsAddress.allocate(msg.sender, dividendsAllocation, new bytes(0)); } // add redeeming entry userRedeems[msg.sender].push(RedeemInfo(grailAmount, xGrailAmount, _currentBlockTimestamp().add(duration), dividendsAddress, dividendsAllocation)); } else { // immediately redeem for GRAIL _finalizeRedeem(msg.sender, xGrailAmount, grailAmount); } } /** * @dev Finalizes redeem process when vesting duration has been reached * * Can only be called by the redeem entry owner */ function finalizeRedeem(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) { XGrailBalance storage balance = xGrailBalances[msg.sender]; RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; require(_currentBlockTimestamp() >= _redeem.endTime, "finalizeRedeem: vesting duration has not ended yet"); // remove from SBT total balance.redeemingAmount = balance.redeemingAmount.sub(_redeem.xGrailAmount); _finalizeRedeem(msg.sender, _redeem.xGrailAmount, _redeem.grailAmount); // handle dividends compensation if any was active if(_redeem.dividendsAllocation > 0) { // deallocate from dividends IXGrailTokenUsage(_redeem.dividendsAddress).deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0)); } // remove redeem entry _deleteRedeemEntry(redeemIndex); } /** * @dev Updates dividends address for an existing active redeeming process * * Can only be called by the involved user * Should only be used if dividends contract was to be migrated */ function updateRedeemDividendsAddress(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) { RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; // only if the active dividends contract is not the same anymore if(dividendsAddress != _redeem.dividendsAddress && address(dividendsAddress) != address(0)) { if(_redeem.dividendsAllocation > 0) { // deallocate from old dividends contract _redeem.dividendsAddress.deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0)); // allocate to new used dividends contract dividendsAddress.allocate(msg.sender, _redeem.dividendsAllocation, new bytes(0)); } emit UpdateRedeemDividendsAddress(msg.sender, redeemIndex, address(_redeem.dividendsAddress), address(dividendsAddress)); _redeem.dividendsAddress = dividendsAddress; } } /** * @dev Cancels an ongoing redeem entry * * Can only be called by its owner */ function cancelRedeem(uint256 redeemIndex) external nonReentrant validateRedeem(msg.sender, redeemIndex) { XGrailBalance storage balance = xGrailBalances[msg.sender]; RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex]; // make redeeming xGRAIL available again balance.redeemingAmount = balance.redeemingAmount.sub(_redeem.xGrailAmount); _transfer(address(this), msg.sender, _redeem.xGrailAmount); // handle dividends compensation if any was active if(_redeem.dividendsAllocation > 0) { // deallocate from dividends IXGrailTokenUsage(_redeem.dividendsAddress).deallocate(msg.sender, _redeem.dividendsAllocation, new bytes(0)); } emit CancelRedeem(msg.sender, _redeem.xGrailAmount); // remove redeem entry _deleteRedeemEntry(redeemIndex); } /** * @dev Allocates caller's "amount" of available xGRAIL to "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function allocate(address usageAddress, uint256 amount, bytes calldata usageData) external nonReentrant { _allocate(msg.sender, usageAddress, amount); // allocates xGRAIL to usageContract IXGrailTokenUsage(usageAddress).allocate(msg.sender, amount, usageData); } /** * @dev Allocates "amount" of available xGRAIL from "userAddress" to caller (ie usage contract) * * Caller must have an allocation approval for the required xGrail xGRAIL from "userAddress" */ function allocateFromUsage(address userAddress, uint256 amount) external override nonReentrant { _allocate(userAddress, msg.sender, amount); } /** * @dev Deallocates caller's "amount" of available xGRAIL from "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function deallocate(address usageAddress, uint256 amount, bytes calldata usageData) external nonReentrant { _deallocate(msg.sender, usageAddress, amount); // deallocate xGRAIL into usageContract IXGrailTokenUsage(usageAddress).deallocate(msg.sender, amount, usageData); } /** * @dev Deallocates "amount" of allocated xGRAIL belonging to "userAddress" from caller (ie usage contract) * * Caller can only deallocate xGRAIL from itself */ function deallocateFromUsage(address userAddress, uint256 amount) external override nonReentrant { _deallocate(userAddress, msg.sender, amount); } /********************************************************/ /****************** INTERNAL FUNCTIONS ******************/ /********************************************************/ /** * @dev Convert caller's "amount" of GRAIL into xGRAIL to "to" */ function _convert(uint256 amount, address to) internal { require(amount != 0, "convert: amount cannot be null"); // mint new xGRAIL _mint(to, amount); emit Convert(msg.sender, to, amount); grailToken.safeTransferFrom(msg.sender, address(this), amount); } /** * @dev Finalizes the redeeming process for "userAddress" by transferring him "grailAmount" and removing "xGrailAmount" from supply * * Any vesting check should be ran before calling this * GRAIL excess is automatically burnt */ function _finalizeRedeem(address userAddress, uint256 xGrailAmount, uint256 grailAmount) internal { uint256 grailExcess = xGrailAmount.sub(grailAmount); // sends due GRAIL tokens grailToken.safeTransfer(userAddress, grailAmount); // burns GRAIL excess if any grailToken.burn(grailExcess); _burn(address(this), xGrailAmount); emit FinalizeRedeem(userAddress, xGrailAmount, grailAmount); } /** * @dev Allocates "userAddress" user's "amount" of available xGRAIL to "usageAddress" contract * */ function _allocate(address userAddress, address usageAddress, uint256 amount) internal { require(amount > 0, "allocate: amount cannot be null"); XGrailBalance storage balance = xGrailBalances[userAddress]; // approval checks if allocation request amount has been approved by userAddress to be allocated to this usageAddress uint256 approvedXGrail = usageApprovals[userAddress][usageAddress]; require(approvedXGrail >= amount, "allocate: non authorized amount"); // remove allocated amount from usage's approved amount usageApprovals[userAddress][usageAddress] = approvedXGrail.sub(amount); // update usage's allocatedAmount for userAddress usageAllocations[userAddress][usageAddress] = usageAllocations[userAddress][usageAddress].add(amount); // adjust user's xGRAIL balances balance.allocatedAmount = balance.allocatedAmount.add(amount); _transfer(userAddress, address(this), amount); emit Allocate(userAddress, usageAddress, amount); } /** * @dev Deallocates "amount" of available xGRAIL to "usageAddress" contract * * args specific to usage contract must be passed into "usageData" */ function _deallocate(address userAddress, address usageAddress, uint256 amount) internal { require(amount > 0, "deallocate: amount cannot be null"); // check if there is enough allocated xGRAIL to this usage to deallocate uint256 allocatedAmount = usageAllocations[userAddress][usageAddress]; require(allocatedAmount >= amount, "deallocate: non authorized amount"); // remove deallocated amount from usage's allocation usageAllocations[userAddress][usageAddress] = allocatedAmount.sub(amount); uint256 deallocationFeeAmount = amount.mul(usagesDeallocationFee[usageAddress]).div(10000); // adjust user's xGRAIL balances XGrailBalance storage balance = xGrailBalances[userAddress]; balance.allocatedAmount = balance.allocatedAmount.sub(amount); _transfer(address(this), userAddress, amount.sub(deallocationFeeAmount)); // burn corresponding GRAIL and XGRAIL grailToken.burn(deallocationFeeAmount); _burn(address(this), deallocationFeeAmount); emit Deallocate(userAddress, usageAddress, amount, deallocationFeeAmount); } function _deleteRedeemEntry(uint256 index) internal { userRedeems[msg.sender][index] = userRedeems[msg.sender][userRedeems[msg.sender].length - 1]; userRedeems[msg.sender].pop(); } /** * @dev Hook override to forbid transfers except from whitelisted addresses and minting */ function _beforeTokenTransfer(address from, address to, uint256 /*amount*/) internal view override { require(from == address(0) || _transferWhitelist.contains(from) || _transferWhitelist.contains(to), "transfer: not allowed"); } /** * @dev Utility function to get the current block timestamp */ function _currentBlockTimestamp() internal view virtual returns (uint256) { /* solhint-disable not-rely-on-time */ return block.timestamp; } }
// SPDX-License-Identifier: MIT pragma solidity =0.7.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IXGrailToken is IERC20 { function usageAllocations(address userAddress, address usageAddress) external view returns (uint256 allocation); function allocateFromUsage(address userAddress, uint256 amount) external; function convertTo(uint256 amount, address to) external; function deallocateFromUsage(address userAddress, uint256 amount) external; function isTransferWhitelisted(address account) external view returns (bool); }
// SPDX-License-Identifier: MIT pragma solidity =0.7.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface IGrailTokenV2 is IERC20{ function lastEmissionTime() external view returns (uint256); function claimMasterRewards(uint256 amount) external returns (uint256 effectiveAmount); function masterEmissionRate() external view returns (uint256); function burn(uint256 amount) external; }
// SPDX-License-Identifier: MIT pragma solidity =0.7.6; interface IXGrailTokenUsage { function allocate(address userAddress, uint256 amount, bytes calldata data) external; function deallocate(address userAddress, uint256 amount, bytes calldata data) external; }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @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]. */ abstract 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 () { _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; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; /** * @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 v3.3.0, sets of type `bytes32` (`Bytes32Set`), `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]; } // Bytes32Set struct Bytes32Set { 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(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, 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(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set 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(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, 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(uint160(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(uint160(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(uint160(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(uint160(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 <0.8.0; /* * @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 ^0.7.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity ^0.7.0; 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 ^0.7.0; /** * @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 ^0.7.0; import "../../utils/Context.sol"; import "./IERC20.sol"; import "../../math/SafeMath.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; 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_) { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view virtual returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual 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 virtual returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual 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 virtual { _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 ^0.7.0; /** * @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, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, 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 (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @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) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @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) { 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, reverting 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) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting 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) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * 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); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * 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); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * 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 ^0.7.0; import "../utils/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. */ abstract 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 () { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { 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; } }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 50000 }, "evmVersion": "istanbul", "libraries": {}, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IGrailTokenV2","name":"grailToken_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Allocate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ApproveUsage","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xGrailAmount","type":"uint256"}],"name":"CancelRedeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Convert","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"Deallocate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xGrailAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"grailAmount","type":"uint256"}],"name":"FinalizeRedeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xGrailAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"grailAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"duration","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"add","type":"bool"}],"name":"SetTransferWhitelist","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"UpdateDeallocationFee","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousDividendsAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newDividendsAddress","type":"address"}],"name":"UpdateDividendsAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"redeemIndex","type":"uint256"},{"indexed":false,"internalType":"address","name":"previousDividendsAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newDividendsAddress","type":"address"}],"name":"UpdateRedeemDividendsAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"minRedeemRatio","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxRedeemRatio","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minRedeemDuration","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxRedeemDuration","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"redeemDividendsAdjustment","type":"uint256"}],"name":"UpdateRedeemSettings","type":"event"},{"inputs":[],"name":"MAX_DEALLOCATION_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_FIXED_RATIO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usageAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"usageData","type":"bytes"}],"name":"allocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"allocateFromUsage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IXGrailTokenUsage","name":"usage","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approveUsage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"redeemIndex","type":"uint256"}],"name":"cancelRedeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"convert","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"to","type":"address"}],"name":"convertTo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"usageAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"usageData","type":"bytes"}],"name":"deallocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deallocateFromUsage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"dividendsAddress","outputs":[{"internalType":"contract IXGrailTokenUsage","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"redeemIndex","type":"uint256"}],"name":"finalizeRedeem","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"duration","type":"uint256"}],"name":"getGrailByVestingDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"address","name":"usageAddress","type":"address"}],"name":"getUsageAllocation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"address","name":"usageAddress","type":"address"}],"name":"getUsageApproval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"redeemIndex","type":"uint256"}],"name":"getUserRedeem","outputs":[{"internalType":"uint256","name":"grailAmount","type":"uint256"},{"internalType":"uint256","name":"xGrailAmount","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"address","name":"dividendsContract","type":"address"},{"internalType":"uint256","name":"dividendsAllocation","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"}],"name":"getUserRedeemsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"}],"name":"getXGrailBalance","outputs":[{"internalType":"uint256","name":"allocatedAmount","type":"uint256"},{"internalType":"uint256","name":"redeemingAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"grailToken","outputs":[{"internalType":"contract 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IXGrailTokenUsage","name":"dividendsAddress_","type":"address"}],"name":"updateDividendsAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"redeemIndex","type":"uint256"}],"name":"updateRedeemDividendsAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"minRedeemRatio_","type":"uint256"},{"internalType":"uint256","name":"maxRedeemRatio_","type":"uint256"},{"internalType":"uint256","name":"minRedeemDuration_","type":"uint256"},{"internalType":"uint256","name":"maxRedeemDuration_","type":"uint256"},{"internalType":"uint256","name":"redeemDividendsAdjustment_","type":"uint256"}],"name":"updateRedeemSettings","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bool","name":"add","type":"bool"}],"name":"updateTransferWhitelist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"usageAllocations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"usageApprovals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"usagesDeallocationFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"userRedeems","outputs":[{"internalType":"uint256","name":"grailAmount","type":"uint256"},{"internalType":"uint256","name":"xGrailAmount","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"contract IXGrailTokenUsage","name":"dividendsAddress","type":"address"},{"internalType":"uint256","name":"dividendsAllocation","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"xGrailBalances","outputs":[{"internalType":"uint256","name":"allocatedAmount","type":"uint256"},{"internalType":"uint256","name":"redeemingAmount","type":"uint256"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000003d9907f9a368ad0a51be60f7da3b97cf940982d8
-----Decoded View---------------
Arg [0] : grailToken_ (address): 0x3d9907F9a368ad0a51Be60f7Da3b97cf940982D8
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000003d9907f9a368ad0a51be60f7da3b97cf940982d8
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