Address Details
contract
0x52449A99e3455acB831C0D580dCDAc8B290d5182
- Contract Name
- TransferWhitelist
- Creator
- 0x456f41–3584da at 0xbd08d8–15464f
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 2 Transactions
- Transfers
- 0 Transfers
- Gas Used
- 875,453
- Last Balance Update
- 503
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- TransferWhitelist
- Optimization enabled
- false
- Compiler version
- v0.5.13+commit.5b0b510c
- EVM Version
- istanbul
- Verified at
- 2021-10-19T07:50:57.173728Z
Contract source code
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "./UsingRegistry.sol"; /** * @title Holds a whitelist of addresses for which transfers should not be * frozen so that network initialization can take place. */ contract TransferWhitelist is Ownable, UsingRegistry { using SafeMath for uint256; address[] private directlyWhitelistedAddresses; bytes32[] public whitelistedContractIdentifiers; event WhitelistedAddress(address indexed addr); event WhitelistedAddressRemoved(address indexed addr); event WhitelistedContractIdentifier(bytes32 indexed contractIdentifier); constructor(address registryAddress) public { _transferOwnership(msg.sender); setRegistry(registryAddress); } /** * @notice Add an address to the whitelist. * @param newAddress The address to add. */ function whitelistAddress(address newAddress) public onlyOwner { directlyWhitelistedAddresses.push(newAddress); emit WhitelistedAddress(newAddress); } /** * @notice Remove an address from the whitelist. * @param removedAddress The address to remove. * @param index Index of address in the whitelist. */ function removeAddress(address removedAddress, uint256 index) external onlyOwner { require(index < directlyWhitelistedAddresses.length, "Whitelist index out of range"); require(directlyWhitelistedAddresses[index] == removedAddress, "Bad whitelist index"); uint256 tailIndex = directlyWhitelistedAddresses.length.sub(1); if (index != tailIndex) { directlyWhitelistedAddresses[index] = directlyWhitelistedAddresses[tailIndex]; } directlyWhitelistedAddresses.length = tailIndex; emit WhitelistedAddressRemoved(removedAddress); } /** * @notice Adds the registry id of a whitelisted contract. * @param contractIdentifier The id of the contract to be added. */ function whitelistRegisteredContract(bytes32 contractIdentifier) external onlyOwner { require( registry.getAddressFor(contractIdentifier) != address(0), "contractIdentifier does not correspond to a registered address" ); whitelistedContractIdentifiers.push(contractIdentifier); emit WhitelistedContractIdentifier(contractIdentifier); } /** * @notice Gets the number of registered contracts * @return The length of whitelistedContractIdentifiers */ function getNumberOfWhitelistedContractIdentifiers() external view returns (uint256 length) { return whitelistedContractIdentifiers.length; } /** * @notice Set the whitelist of addresses. * @param _whitelist The new whitelist of addresses. */ function setDirectlyWhitelistedAddresses(address[] calldata _whitelist) external onlyOwner { for (uint256 i = 0; i < directlyWhitelistedAddresses.length; i = i.add(1)) { emit WhitelistedAddressRemoved(directlyWhitelistedAddresses[i]); } directlyWhitelistedAddresses.length = 0; for (uint256 i = 0; i < _whitelist.length; i = i.add(1)) { whitelistAddress(_whitelist[i]); } } /** * @notice Set the whitelist of registered contracts. * @param _registeredContracts The new whitelist of registered contract ids. */ function setWhitelistedContractIdentifiers(bytes32[] calldata _registeredContracts) external onlyOwner { whitelistedContractIdentifiers = _registeredContracts; } /** * @notice Appends the addresses of registered contracts to the * whitelist before returning the list. * @dev If a registry id is not yet registered, the null address * will be appended to the list instead. * @return The full whitelist of addresses. */ function getWhitelist() external view returns (address[] memory) { uint256 len = directlyWhitelistedAddresses.length.add(whitelistedContractIdentifiers.length); address[] memory _whitelist = new address[](len); uint256 i = 0; while (i < directlyWhitelistedAddresses.length) { _whitelist[i] = directlyWhitelistedAddresses[i]; i = i.add(1); } for (uint256 j = 0; j < whitelistedContractIdentifiers.length; j = j.add(1)) { _whitelist[i] = registry.getAddressFor(whitelistedContractIdentifiers[j]); i = i.add(1); } return _whitelist; } /** * @notice Clears all data (storage and bytecode) at this contract's address. * @dev The balance of this contract is returned to the owner. */ function selfDestruct() external onlyOwner { selfdestruct(msg.sender); } }
UsingRegistry.sol
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol"; import "./interfaces/IAccounts.sol"; import "./interfaces/IFeeCurrencyWhitelist.sol"; import "./interfaces/IFreezer.sol"; import "./interfaces/IRegistry.sol"; import "../governance/interfaces/IElection.sol"; import "../governance/interfaces/IGovernance.sol"; import "../governance/interfaces/ILockedGold.sol"; import "../governance/interfaces/IValidators.sol"; import "../identity/interfaces/IRandom.sol"; import "../identity/interfaces/IAttestations.sol"; import "../stability/interfaces/IExchange.sol"; import "../stability/interfaces/IReserve.sol"; import "../stability/interfaces/ISortedOracles.sol"; import "../stability/interfaces/IStableToken.sol"; contract UsingRegistry is Ownable { event RegistrySet(address indexed registryAddress); // solhint-disable state-visibility bytes32 constant ACCOUNTS_REGISTRY_ID = keccak256(abi.encodePacked("Accounts")); bytes32 constant ATTESTATIONS_REGISTRY_ID = keccak256(abi.encodePacked("Attestations")); bytes32 constant DOWNTIME_SLASHER_REGISTRY_ID = keccak256(abi.encodePacked("DowntimeSlasher")); bytes32 constant DOUBLE_SIGNING_SLASHER_REGISTRY_ID = keccak256( abi.encodePacked("DoubleSigningSlasher") ); bytes32 constant ELECTION_REGISTRY_ID = keccak256(abi.encodePacked("Election")); bytes32 constant EXCHANGE_REGISTRY_ID = keccak256(abi.encodePacked("Exchange")); bytes32 constant FEE_CURRENCY_WHITELIST_REGISTRY_ID = keccak256( abi.encodePacked("FeeCurrencyWhitelist") ); bytes32 constant FREEZER_REGISTRY_ID = keccak256(abi.encodePacked("Freezer")); bytes32 constant GOLD_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("GoldToken")); bytes32 constant GOVERNANCE_REGISTRY_ID = keccak256(abi.encodePacked("Governance")); bytes32 constant GOVERNANCE_SLASHER_REGISTRY_ID = keccak256( abi.encodePacked("GovernanceSlasher") ); bytes32 constant LOCKED_GOLD_REGISTRY_ID = keccak256(abi.encodePacked("LockedGold")); bytes32 constant RESERVE_REGISTRY_ID = keccak256(abi.encodePacked("Reserve")); bytes32 constant RANDOM_REGISTRY_ID = keccak256(abi.encodePacked("Random")); bytes32 constant SORTED_ORACLES_REGISTRY_ID = keccak256(abi.encodePacked("SortedOracles")); bytes32 constant STABLE_TOKEN_REGISTRY_ID = keccak256(abi.encodePacked("StableToken")); bytes32 constant VALIDATORS_REGISTRY_ID = keccak256(abi.encodePacked("Validators")); // solhint-enable state-visibility IRegistry public registry; modifier onlyRegisteredContract(bytes32 identifierHash) { require(registry.getAddressForOrDie(identifierHash) == msg.sender, "only registered contract"); _; } modifier onlyRegisteredContracts(bytes32[] memory identifierHashes) { require(registry.isOneOf(identifierHashes, msg.sender), "only registered contracts"); _; } /** * @notice Updates the address pointing to a Registry contract. * @param registryAddress The address of a registry contract for routing to other contracts. */ function setRegistry(address registryAddress) public onlyOwner { require(registryAddress != address(0), "Cannot register the null address"); registry = IRegistry(registryAddress); emit RegistrySet(registryAddress); } function getAccounts() internal view returns (IAccounts) { return IAccounts(registry.getAddressForOrDie(ACCOUNTS_REGISTRY_ID)); } function getAttestations() internal view returns (IAttestations) { return IAttestations(registry.getAddressForOrDie(ATTESTATIONS_REGISTRY_ID)); } function getElection() internal view returns (IElection) { return IElection(registry.getAddressForOrDie(ELECTION_REGISTRY_ID)); } function getExchange() internal view returns (IExchange) { return IExchange(registry.getAddressForOrDie(EXCHANGE_REGISTRY_ID)); } function getFeeCurrencyWhitelistRegistry() internal view returns (IFeeCurrencyWhitelist) { return IFeeCurrencyWhitelist(registry.getAddressForOrDie(FEE_CURRENCY_WHITELIST_REGISTRY_ID)); } function getFreezer() internal view returns (IFreezer) { return IFreezer(registry.getAddressForOrDie(FREEZER_REGISTRY_ID)); } function getGoldToken() internal view returns (IERC20) { return IERC20(registry.getAddressForOrDie(GOLD_TOKEN_REGISTRY_ID)); } function getGovernance() internal view returns (IGovernance) { return IGovernance(registry.getAddressForOrDie(GOVERNANCE_REGISTRY_ID)); } function getLockedGold() internal view returns (ILockedGold) { return ILockedGold(registry.getAddressForOrDie(LOCKED_GOLD_REGISTRY_ID)); } function getRandom() internal view returns (IRandom) { return IRandom(registry.getAddressForOrDie(RANDOM_REGISTRY_ID)); } function getReserve() internal view returns (IReserve) { return IReserve(registry.getAddressForOrDie(RESERVE_REGISTRY_ID)); } function getSortedOracles() internal view returns (ISortedOracles) { return ISortedOracles(registry.getAddressForOrDie(SORTED_ORACLES_REGISTRY_ID)); } function getStableToken() internal view returns (IStableToken) { return IStableToken(registry.getAddressForOrDie(STABLE_TOKEN_REGISTRY_ID)); } function getValidators() internal view returns (IValidators) { return IValidators(registry.getAddressForOrDie(VALIDATORS_REGISTRY_ID)); } }
IAccounts.sol
pragma solidity ^0.5.13; interface IAccounts { function isAccount(address) external view returns (bool); function voteSignerToAccount(address) external view returns (address); function validatorSignerToAccount(address) external view returns (address); function attestationSignerToAccount(address) external view returns (address); function signerToAccount(address) external view returns (address); function getAttestationSigner(address) external view returns (address); function getValidatorSigner(address) external view returns (address); function getVoteSigner(address) external view returns (address); function hasAuthorizedVoteSigner(address) external view returns (bool); function hasAuthorizedValidatorSigner(address) external view returns (bool); function hasAuthorizedAttestationSigner(address) external view returns (bool); function setAccountDataEncryptionKey(bytes calldata) external; function setMetadataURL(string calldata) external; function setName(string calldata) external; function setWalletAddress(address, uint8, bytes32, bytes32) external; function setAccount(string calldata, bytes calldata, address, uint8, bytes32, bytes32) external; function getDataEncryptionKey(address) external view returns (bytes memory); function getWalletAddress(address) external view returns (address); function getMetadataURL(address) external view returns (string memory); function batchGetMetadataURL(address[] calldata) external view returns (uint256[] memory, bytes memory); function getName(address) external view returns (string memory); function authorizeVoteSigner(address, uint8, bytes32, bytes32) external; function authorizeValidatorSigner(address, uint8, bytes32, bytes32) external; function authorizeValidatorSignerWithPublicKey(address, uint8, bytes32, bytes32, bytes calldata) external; function authorizeValidatorSignerWithKeys( address, uint8, bytes32, bytes32, bytes calldata, bytes calldata, bytes calldata ) external; function authorizeAttestationSigner(address, uint8, bytes32, bytes32) external; function createAccount() external returns (bool); }
IFeeCurrencyWhitelist.sol
pragma solidity ^0.5.13; interface IFeeCurrencyWhitelist { function addToken(address) external; function getWhitelist() external view returns (address[] memory); }
IFreezer.sol
pragma solidity ^0.5.13; interface IFreezer { function isFrozen(address) external view returns (bool); }
IRegistry.sol
pragma solidity ^0.5.13; interface IRegistry { function setAddressFor(string calldata, address) external; function getAddressForOrDie(bytes32) external view returns (address); function getAddressFor(bytes32) external view returns (address); function getAddressForStringOrDie(string calldata identifier) external view returns (address); function getAddressForString(string calldata identifier) external view returns (address); function isOneOf(bytes32[] calldata, address) external view returns (bool); }
IElection.sol
pragma solidity ^0.5.13; interface IElection { function electValidatorSigners() external view returns (address[] memory); function electNValidatorSigners(uint256, uint256) external view returns (address[] memory); function vote(address, uint256, address, address) external returns (bool); function activate(address) external returns (bool); function revokeActive(address, uint256, address, address, uint256) external returns (bool); function revokeAllActive(address, address, address, uint256) external returns (bool); function revokePending(address, uint256, address, address, uint256) external returns (bool); function markGroupIneligible(address) external; function markGroupEligible(address, address, address) external; function forceDecrementVotes( address, uint256, address[] calldata, address[] calldata, uint256[] calldata ) external returns (uint256); // view functions function getElectableValidators() external view returns (uint256, uint256); function getElectabilityThreshold() external view returns (uint256); function getNumVotesReceivable(address) external view returns (uint256); function getTotalVotes() external view returns (uint256); function getActiveVotes() external view returns (uint256); function getTotalVotesByAccount(address) external view returns (uint256); function getPendingVotesForGroupByAccount(address, address) external view returns (uint256); function getActiveVotesForGroupByAccount(address, address) external view returns (uint256); function getTotalVotesForGroupByAccount(address, address) external view returns (uint256); function getActiveVoteUnitsForGroupByAccount(address, address) external view returns (uint256); function getTotalVotesForGroup(address) external view returns (uint256); function getActiveVotesForGroup(address) external view returns (uint256); function getPendingVotesForGroup(address) external view returns (uint256); function getGroupEligibility(address) external view returns (bool); function getGroupEpochRewards(address, uint256, uint256[] calldata) external view returns (uint256); function getGroupsVotedForByAccount(address) external view returns (address[] memory); function getEligibleValidatorGroups() external view returns (address[] memory); function getTotalVotesForEligibleValidatorGroups() external view returns (address[] memory, uint256[] memory); function getCurrentValidatorSigners() external view returns (address[] memory); function canReceiveVotes(address, uint256) external view returns (bool); function hasActivatablePendingVotes(address, address) external view returns (bool); // only owner function setElectableValidators(uint256, uint256) external returns (bool); function setMaxNumGroupsVotedFor(uint256) external returns (bool); function setElectabilityThreshold(uint256) external returns (bool); // only VM function distributeEpochRewards(address, uint256, address, address) external; }
IGovernance.sol
pragma solidity ^0.5.13; interface IGovernance { function isVoting(address) external view returns (bool); }
ILockedGold.sol
pragma solidity ^0.5.13; interface ILockedGold { function incrementNonvotingAccountBalance(address, uint256) external; function decrementNonvotingAccountBalance(address, uint256) external; function getAccountTotalLockedGold(address) external view returns (uint256); function getTotalLockedGold() external view returns (uint256); function getPendingWithdrawals(address) external view returns (uint256[] memory, uint256[] memory); function getTotalPendingWithdrawals(address) external view returns (uint256); function lock() external payable; function unlock(uint256) external; function relock(uint256, uint256) external; function withdraw(uint256) external; function slash( address account, uint256 penalty, address reporter, uint256 reward, address[] calldata lessers, address[] calldata greaters, uint256[] calldata indices ) external; function isSlasher(address) external view returns (bool); }
IValidators.sol
pragma solidity ^0.5.13; interface IValidators { function registerValidator(bytes calldata, bytes calldata, bytes calldata) external returns (bool); function deregisterValidator(uint256) external returns (bool); function affiliate(address) external returns (bool); function deaffiliate() external returns (bool); function updateBlsPublicKey(bytes calldata, bytes calldata) external returns (bool); function registerValidatorGroup(uint256) external returns (bool); function deregisterValidatorGroup(uint256) external returns (bool); function addMember(address) external returns (bool); function addFirstMember(address, address, address) external returns (bool); function removeMember(address) external returns (bool); function reorderMember(address, address, address) external returns (bool); function updateCommission() external; function setNextCommissionUpdate(uint256) external; function resetSlashingMultiplier() external; // only owner function setCommissionUpdateDelay(uint256) external; function setMaxGroupSize(uint256) external returns (bool); function setMembershipHistoryLength(uint256) external returns (bool); function setValidatorScoreParameters(uint256, uint256) external returns (bool); function setGroupLockedGoldRequirements(uint256, uint256) external returns (bool); function setValidatorLockedGoldRequirements(uint256, uint256) external returns (bool); function setSlashingMultiplierResetPeriod(uint256) external; // view functions function getMaxGroupSize() external view returns (uint256); function getCommissionUpdateDelay() external view returns (uint256); function getValidatorScoreParameters() external view returns (uint256, uint256); function getMembershipHistory(address) external view returns (uint256[] memory, address[] memory, uint256, uint256); function calculateEpochScore(uint256) external view returns (uint256); function calculateGroupEpochScore(uint256[] calldata) external view returns (uint256); function getAccountLockedGoldRequirement(address) external view returns (uint256); function meetsAccountLockedGoldRequirements(address) external view returns (bool); function getValidatorBlsPublicKeyFromSigner(address) external view returns (bytes memory); function getValidator(address account) external view returns (bytes memory, bytes memory, address, uint256, address); function getValidatorGroup(address) external view returns (address[] memory, uint256, uint256, uint256, uint256[] memory, uint256, uint256); function getGroupNumMembers(address) external view returns (uint256); function getTopGroupValidators(address, uint256) external view returns (address[] memory); function getGroupsNumMembers(address[] calldata accounts) external view returns (uint256[] memory); function getNumRegisteredValidators() external view returns (uint256); function groupMembershipInEpoch(address, uint256, uint256) external view returns (address); // only registered contract function updateEcdsaPublicKey(address, address, bytes calldata) external returns (bool); function updatePublicKeys(address, address, bytes calldata, bytes calldata, bytes calldata) external returns (bool); function getValidatorLockedGoldRequirements() external view returns (uint256, uint256); function getGroupLockedGoldRequirements() external view returns (uint256, uint256); function getRegisteredValidators() external view returns (address[] memory); function getRegisteredValidatorSigners() external view returns (address[] memory); function getRegisteredValidatorGroups() external view returns (address[] memory); function isValidatorGroup(address) external view returns (bool); function isValidator(address) external view returns (bool); function getValidatorGroupSlashingMultiplier(address) external view returns (uint256); function getMembershipInLastEpoch(address) external view returns (address); function getMembershipInLastEpochFromSigner(address) external view returns (address); // only VM function updateValidatorScoreFromSigner(address, uint256) external; function distributeEpochPaymentsFromSigner(address, uint256) external returns (uint256); // only slasher function forceDeaffiliateIfValidator(address) external; function halveSlashingMultiplier(address) external; }
IAttestations.sol
pragma solidity ^0.5.13; interface IAttestations { function request(bytes32, uint256, address) external; function selectIssuers(bytes32) external; function complete(bytes32, uint8, bytes32, bytes32) external; function revoke(bytes32, uint256) external; function withdraw(address) external; function approveTransfer(bytes32, uint256, address, address, bool) external; // view functions function getUnselectedRequest(bytes32, address) external view returns (uint32, uint32, address); function getAttestationIssuers(bytes32, address) external view returns (address[] memory); function getAttestationStats(bytes32, address) external view returns (uint32, uint32); function batchGetAttestationStats(bytes32[] calldata) external view returns (uint256[] memory, address[] memory, uint64[] memory, uint64[] memory); function getAttestationState(bytes32, address, address) external view returns (uint8, uint32, address); function getCompletableAttestations(bytes32, address) external view returns (uint32[] memory, address[] memory, uint256[] memory, bytes memory); function getAttestationRequestFee(address) external view returns (uint256); function getMaxAttestations() external view returns (uint256); function validateAttestationCode(bytes32, address, uint8, bytes32, bytes32) external view returns (address); function lookupAccountsForIdentifier(bytes32) external view returns (address[] memory); function requireNAttestationsRequested(bytes32, address, uint32) external view; // only owner function setAttestationRequestFee(address, uint256) external; function setAttestationExpiryBlocks(uint256) external; function setSelectIssuersWaitBlocks(uint256) external; function setMaxAttestations(uint256) external; }
IRandom.sol
pragma solidity ^0.5.13; interface IRandom { function revealAndCommit(bytes32, bytes32, address) external; function randomnessBlockRetentionWindow() external view returns (uint256); function random() external view returns (bytes32); function getBlockRandomness(uint256) external view returns (bytes32); }
IExchange.sol
pragma solidity ^0.5.13; interface IExchange { function buy(uint256, uint256, bool) external returns (uint256); function sell(uint256, uint256, bool) external returns (uint256); function exchange(uint256, uint256, bool) external returns (uint256); function setUpdateFrequency(uint256) external; function getBuyTokenAmount(uint256, bool) external view returns (uint256); function getSellTokenAmount(uint256, bool) external view returns (uint256); function getBuyAndSellBuckets(bool) external view returns (uint256, uint256); }
IReserve.sol
pragma solidity ^0.5.13; interface IReserve { function setTobinTaxStalenessThreshold(uint256) external; function addToken(address) external returns (bool); function removeToken(address, uint256) external returns (bool); function transferGold(address payable, uint256) external returns (bool); function transferExchangeGold(address payable, uint256) external returns (bool); function getReserveGoldBalance() external view returns (uint256); function getUnfrozenReserveGoldBalance() external view returns (uint256); function getOrComputeTobinTax() external returns (uint256, uint256); function getTokens() external view returns (address[] memory); function getReserveRatio() external view returns (uint256); function addExchangeSpender(address) external; function removeExchangeSpender(address, uint256) external; function addSpender(address) external; function removeSpender(address) external; }
ISortedOracles.sol
pragma solidity ^0.5.13; interface ISortedOracles { function addOracle(address, address) external; function removeOracle(address, address, uint256) external; function report(address, uint256, address, address) external; function removeExpiredReports(address, uint256) external; function isOldestReportExpired(address token) external view returns (bool, address); function numRates(address) external view returns (uint256); function medianRate(address) external view returns (uint256, uint256); function numTimestamps(address) external view returns (uint256); function medianTimestamp(address) external view returns (uint256); }
IStableToken.sol
pragma solidity ^0.5.13; /** * @title This interface describes the functions specific to Celo Stable Tokens, and in the * absence of interface inheritance is intended as a companion to IERC20.sol and ICeloToken.sol. */ interface IStableToken { function mint(address, uint256) external returns (bool); function burn(uint256) external returns (bool); function setInflationParameters(uint256, uint256) external; function valueToUnits(uint256) external view returns (uint256); function unitsToValue(uint256) external view returns (uint256); function getInflationParameters() external view returns (uint256, uint256, uint256, uint256); // NOTE: duplicated with IERC20.sol, remove once interface inheritance is supported. function balanceOf(address) external view returns (uint256); }
Context.sol
pragma solidity ^0.5.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
SafeMath.sol
pragma solidity ^0.5.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
Ownable.sol
pragma solidity ^0.5.0; import "../GSN/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(isOwner(), "Ownable: caller is not the owner"); _; } /** * @dev Returns true if the caller is the current owner. */ function isOwner() public view returns (bool) { return _msgSender() == _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 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 onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
IERC20.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"registryAddress","internalType":"address"}]},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"RegistrySet","inputs":[{"type":"address","name":"registryAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"WhitelistedAddress","inputs":[{"type":"address","name":"addr","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"WhitelistedAddressRemoved","inputs":[{"type":"address","name":"addr","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"WhitelistedContractIdentifier","inputs":[{"type":"bytes32","name":"contractIdentifier","internalType":"bytes32","indexed":true}],"anonymous":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"length","internalType":"uint256"}],"name":"getNumberOfWhitelistedContractIdentifiers","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"getWhitelist","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IRegistry"}],"name":"registry","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"removeAddress","inputs":[{"type":"address","name":"removedAddress","internalType":"address"},{"type":"uint256","name":"index","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"selfDestruct","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setDirectlyWhitelistedAddresses","inputs":[{"type":"address[]","name":"_whitelist","internalType":"address[]"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setRegistry","inputs":[{"type":"address","name":"registryAddress","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setWhitelistedContractIdentifiers","inputs":[{"type":"bytes32[]","name":"_registeredContracts","internalType":"bytes32[]"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"whitelistAddress","inputs":[{"type":"address","name":"newAddress","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"whitelistRegisteredContract","inputs":[{"type":"bytes32","name":"contractIdentifier","internalType":"bytes32"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"whitelistedContractIdentifiers","inputs":[{"type":"uint256","name":"","internalType":"uint256"}],"constant":true}]
Contract Creation Code
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