Address Details
contract
0x7C98cc3Ad12058E8E37160Fb72f8ff557d742a54
- Contract Name
- Escrow
- Creator
- 0xe1207b–0408ee at 0xf61951–d90269
- 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
- 0 Transactions
- Transfers
- 0 Transfers
- Gas Used
- Fetching gas used...
- Last Balance Update
- 15665571
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- Escrow
- Optimization enabled
- false
- Compiler version
- v0.5.13+commit.5b0b510c
- EVM Version
- istanbul
- Verified at
- 2022-03-28T13:30:20.724712Z
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/identity/Escrow.sol
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "openzeppelin-solidity/contracts/token/ERC20/ERC20.sol"; import "./interfaces/IAttestations.sol"; import "./interfaces/IEscrow.sol"; import "../common/Initializable.sol"; import "../common/interfaces/ICeloVersionedContract.sol"; import "../common/UsingRegistry.sol"; import "../common/Signatures.sol"; import "../common/libraries/ReentrancyGuard.sol"; contract Escrow is IEscrow, ICeloVersionedContract, ReentrancyGuard, Ownable, Initializable, UsingRegistry { using SafeMath for uint256; event Transfer( address indexed from, bytes32 indexed identifier, address indexed token, uint256 value, address paymentId, uint256 minAttestations ); event Withdrawal( bytes32 indexed identifier, address indexed to, address indexed token, uint256 value, address paymentId ); event Revocation( bytes32 indexed identifier, address indexed by, address indexed token, uint256 value, address paymentId ); struct EscrowedPayment { bytes32 recipientIdentifier; address sender; address token; uint256 value; uint256 sentIndex; // Location of this payment in sender's list of sent payments. uint256 receivedIndex; // Location of this payment in receivers's list of received payments. uint256 timestamp; uint256 expirySeconds; uint256 minAttestations; } // Maps unique payment IDs to escrowed payments. // These payment IDs are the temporary wallet addresses created with the escrowed payments. mapping(address => EscrowedPayment) public escrowedPayments; // Maps receivers' identifiers to a list of received escrowed payment IDs. mapping(bytes32 => address[]) public receivedPaymentIds; // Maps senders' addresses to a list of sent escrowed payment IDs. mapping(address => address[]) public sentPaymentIds; /** * @notice Returns the storage, major, minor, and patch version of the contract. * @return The storage, major, minor, and patch version of the contract. */ function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256) { return (1, 1, 1, 2); } /** * @notice Sets initialized == true on implementation contracts * @param test Set to true to skip implementation initialization */ constructor(bool test) public Initializable(test) {} /** * @notice Used in place of the constructor to allow the contract to be upgradable via proxy. * @param registryAddress The address of the registry core smart contract. */ function initialize(address registryAddress) external initializer { _transferOwnership(msg.sender); setRegistry(registryAddress); } /** * @notice Transfer tokens to a specific user. Supports both identity with privacy (an empty * identifier and 0 minAttestations) and without (with identifier and minAttestations). * @param identifier The hashed identifier of a user to transfer to. * @param token The token to be transferred. * @param value The amount to be transferred. * @param expirySeconds The number of seconds before the sender can revoke the payment. * @param paymentId The address of the temporary wallet associated with this payment. Users must * prove ownership of the corresponding private key to withdraw from escrow. * @param minAttestations The min number of attestations required to withdraw the payment. * @dev Throws if 'token' or 'value' is 0. * @dev msg.sender needs to have already approved this contract to transfer * @dev If no identifier is given, then minAttestations must be 0. */ // solhint-disable-next-line no-simple-event-func-name function transfer( bytes32 identifier, address token, uint256 value, uint256 expirySeconds, address paymentId, uint256 minAttestations ) external nonReentrant returns (bool) { require(token != address(0) && value > 0 && expirySeconds > 0, "Invalid transfer inputs."); require( !(identifier.length <= 0 && !(minAttestations == 0)), "Invalid privacy inputs: Can't require attestations if no identifier" ); IAttestations attestations = IAttestations(registry.getAddressFor(ATTESTATIONS_REGISTRY_ID)); require( minAttestations <= attestations.getMaxAttestations(), "minAttestations larger than limit" ); uint256 sentIndex = sentPaymentIds[msg.sender].push(paymentId).sub(1); uint256 receivedIndex = receivedPaymentIds[identifier].push(paymentId).sub(1); EscrowedPayment storage newPayment = escrowedPayments[paymentId]; require(newPayment.timestamp == 0, "paymentId already used"); newPayment.recipientIdentifier = identifier; newPayment.sender = msg.sender; newPayment.token = token; newPayment.value = value; newPayment.sentIndex = sentIndex; newPayment.receivedIndex = receivedIndex; // solhint-disable-next-line not-rely-on-time newPayment.timestamp = now; newPayment.expirySeconds = expirySeconds; newPayment.minAttestations = minAttestations; require(ERC20(token).transferFrom(msg.sender, address(this), value), "Transfer unsuccessful."); emit Transfer(msg.sender, identifier, token, value, paymentId, minAttestations); return true; } /** * @notice Withdraws tokens for a verified user. * @param paymentId The ID for the EscrowedPayment struct that contains all relevant information. * @param v The recovery id of the incoming ECDSA signature. * @param r Output value r of the ECDSA signature. * @param s Output value s of the ECDSA signature. * @dev Throws if 'token' or 'value' is 0. * @dev Throws if msg.sender does not prove ownership of the withdraw key. */ function withdraw(address paymentId, uint8 v, bytes32 r, bytes32 s) external nonReentrant returns (bool) { address signer = Signatures.getSignerOfAddress(msg.sender, v, r, s); require(signer == paymentId, "Failed to prove ownership of the withdraw key"); EscrowedPayment memory payment = escrowedPayments[paymentId]; require(payment.token != address(0) && payment.value > 0, "Invalid withdraw value."); if (payment.recipientIdentifier.length > 0) { IAttestations attestations = IAttestations(registry.getAddressFor(ATTESTATIONS_REGISTRY_ID)); (uint64 completedAttestations, ) = attestations.getAttestationStats( payment.recipientIdentifier, msg.sender ); require( uint256(completedAttestations) >= payment.minAttestations, "This account does not have enough attestations to withdraw this payment." ); } deletePayment(paymentId); require(ERC20(payment.token).transfer(msg.sender, payment.value), "Transfer not successful."); emit Withdrawal( payment.recipientIdentifier, payment.sender, payment.token, payment.value, paymentId ); return true; } /** * @notice Revokes tokens for a sender who is redeeming a payment after it has expired. * @param paymentId The ID for the EscrowedPayment struct that contains all relevant information. * @dev Throws if 'token' or 'value' is 0. * @dev Throws if msg.sender is not the sender of payment. * @dev Throws if redeem time hasn't been reached yet. */ function revoke(address paymentId) external nonReentrant returns (bool) { EscrowedPayment memory payment = escrowedPayments[paymentId]; require(payment.sender == msg.sender, "Only sender of payment can attempt to revoke payment."); require( // solhint-disable-next-line not-rely-on-time now >= (payment.timestamp.add(payment.expirySeconds)), "Transaction not redeemable for sender yet." ); deletePayment(paymentId); require(ERC20(payment.token).transfer(msg.sender, payment.value), "Transfer not successful."); emit Revocation( payment.recipientIdentifier, payment.sender, payment.token, payment.value, paymentId ); return true; } /** * @notice Gets array of all Escrowed Payments received by identifier. * @param identifier The hash of an identifier of the receiver of the escrowed payment. * @return An array containing all the IDs of the Escrowed Payments that were received * by the specified receiver. */ function getReceivedPaymentIds(bytes32 identifier) external view returns (address[] memory) { return receivedPaymentIds[identifier]; } /** * @notice Gets array of all Escrowed Payment IDs sent by sender. * @param sender The address of the sender of the escrowed payments. * @return An array containing all the IDs of the Escrowed Payments that were sent by the * specified sender. */ function getSentPaymentIds(address sender) external view returns (address[] memory) { return sentPaymentIds[sender]; } /** * @notice Deletes the payment from its receiver's and sender's lists of payments, * and zeroes out all the data in the struct. * @param paymentId The ID of the payment to be deleted. */ function deletePayment(address paymentId) private { EscrowedPayment storage payment = escrowedPayments[paymentId]; address[] storage received = receivedPaymentIds[payment.recipientIdentifier]; address[] storage sent = sentPaymentIds[payment.sender]; escrowedPayments[received[received.length - 1]].receivedIndex = payment.receivedIndex; received[payment.receivedIndex] = received[received.length - 1]; received.length = received.length.sub(1); escrowedPayments[sent[sent.length - 1]].sentIndex = payment.sentIndex; sent[payment.sentIndex] = sent[sent.length - 1]; sent.length = sent.length.sub(1); delete escrowedPayments[paymentId]; } }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/Initializable.sol
pragma solidity ^0.5.13; contract Initializable { bool public initialized; constructor(bool testingDeployment) public { if (!testingDeployment) { initialized = true; } } modifier initializer() { require(!initialized, "contract already initialized"); initialized = true; _; } }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/Signatures.sol
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/cryptography/ECDSA.sol"; library Signatures { /** * @notice Given a signed address, returns the signer of the address. * @param message The address that was signed. * @param v The recovery id of the incoming ECDSA signature. * @param r Output value r of the ECDSA signature. * @param s Output value s of the ECDSA signature. */ function getSignerOfAddress(address message, uint8 v, bytes32 r, bytes32 s) public pure returns (address) { bytes32 hash = keccak256(abi.encodePacked(message)); return getSignerOfMessageHash(hash, v, r, s); } /** * @notice Given a message hash, returns the signer of the address. * @param messageHash The hash of a message. * @param v The recovery id of the incoming ECDSA signature. * @param r Output value r of the ECDSA signature. * @param s Output value s of the ECDSA signature. */ function getSignerOfMessageHash(bytes32 messageHash, uint8 v, bytes32 r, bytes32 s) public pure returns (address) { bytes memory signature = new bytes(65); // Concatenate (r, s, v) into signature. assembly { mstore(add(signature, 32), r) mstore(add(signature, 64), s) mstore8(add(signature, 96), v) } bytes32 prefixedHash = ECDSA.toEthSignedMessageHash(messageHash); return ECDSA.recover(prefixedHash, signature); } /** * @notice Given a domain separator and a structHash, construct the typed data hash * @param eip712DomainSeparator Context specific domain separator * @param structHash hash of the typed data struct * @return The EIP712 typed data hash */ function toEthSignedTypedDataHash(bytes32 eip712DomainSeparator, bytes32 structHash) public pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", eip712DomainSeparator, structHash)); } /** * @notice Given a domain separator and a structHash and a signature return the signer * @param eip712DomainSeparator Context specific domain separator * @param structHash hash of the typed data struct * @param v The recovery id of the incoming ECDSA signature. * @param r Output value r of the ECDSA signature. * @param s Output value s of the ECDSA signature. */ function getSignerOfTypedDataHash( bytes32 eip712DomainSeparator, bytes32 structHash, uint8 v, bytes32 r, bytes32 s ) public pure returns (address) { bytes memory signature = new bytes(65); // Concatenate (r, s, v) into signature. assembly { mstore(add(signature, 32), r) mstore(add(signature, 64), s) mstore8(add(signature, 96), v) } bytes32 prefixedHash = toEthSignedTypedDataHash(eip712DomainSeparator, structHash); return ECDSA.recover(prefixedHash, signature); } }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/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)); } }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/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); function setPaymentDelegation(address, uint256) external; function getPaymentDelegation(address) external view returns (address, uint256); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/ICeloVersionedContract.sol
pragma solidity ^0.5.13; interface ICeloVersionedContract { /** * @notice Returns the storage, major, minor, and patch version of the contract. * @return The storage, major, minor, and patch version of the contract. */ function getVersionNumber() external pure returns (uint256, uint256, uint256, uint256); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/IFeeCurrencyWhitelist.sol
pragma solidity ^0.5.13; interface IFeeCurrencyWhitelist { function addToken(address) external; function getWhitelist() external view returns (address[] memory); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/IFreezer.sol
pragma solidity ^0.5.13; interface IFreezer { function isFrozen(address) external view returns (bool); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/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); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/common/libraries/ReentrancyGuard.sol
pragma solidity ^0.5.13; /** * @title Helps contracts guard against reentrancy attacks. * @author Remco Bloemen <remco@2π.com>, Eenae <alexey@mixbytes.io> * @dev If you mark a function `nonReentrant`, you should also * mark it `external`. */ contract ReentrancyGuard { /// @dev counter to allow mutex lock with only one SSTORE operation uint256 private _guardCounter; constructor() internal { // The counter starts at one to prevent changing it from zero to a non-zero // value, which is a more expensive operation. _guardCounter = 1; } /** * @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() { _guardCounter += 1; uint256 localCounter = _guardCounter; _; require(localCounter == _guardCounter, "reentrant call"); } }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/governance/interfaces/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; }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/governance/interfaces/IGovernance.sol
pragma solidity ^0.5.13; interface IGovernance { function isVoting(address) external view returns (bool); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/governance/interfaces/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); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/governance/interfaces/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; }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/identity/interfaces/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; }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/identity/interfaces/IEscrow.sol
pragma solidity ^0.5.13; interface IEscrow { function transfer( bytes32 identifier, address token, uint256 value, uint256 expirySeconds, address paymentId, uint256 minAttestations ) external returns (bool); function withdraw(address paymentID, uint8 v, bytes32 r, bytes32 s) external returns (bool); function revoke(address paymentID) external returns (bool); function getReceivedPaymentIds(bytes32 identifier) external view returns (address[] memory); function getSentPaymentIds(address sender) external view returns (address[] memory); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/identity/interfaces/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); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/stability/interfaces/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); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/stability/interfaces/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; }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/stability/interfaces/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); }
/home/eruiz/Projects/celo/celo-monorepo/packages/protocol/contracts/stability/interfaces/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); }
/openzeppelin-solidity/contracts/GSN/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; } }
/openzeppelin-solidity/contracts/cryptography/ECDSA.sol
pragma solidity ^0.5.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * NOTE: This call _does not revert_ if the signature is invalid, or * if the signer is otherwise unable to be retrieved. In those scenarios, * the zero address is returned. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length if (signature.length != 65) { return (address(0)); } // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. // solhint-disable-next-line no-inline-assembly assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return address(0); } if (v != 27 && v != 28) { return address(0); } // If the signature is valid (and not malleable), return the signer address return ecrecover(hash, v, r, s); } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * replicates the behavior of the * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`] * JSON-RPC method. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } }
/openzeppelin-solidity/contracts/math/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; } }
/openzeppelin-solidity/contracts/ownership/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; } }
/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol
pragma solidity ^0.5.0; import "../../GSN/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 {ERC20Mintable}. * * 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; /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view 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 returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public 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 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 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 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 { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _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 { require(account != address(0), "ERC20: mint to the zero address"); _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 { require(account != address(0), "ERC20: burn from the zero address"); _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 is 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 { 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 Destroys `amount` tokens from `account`.`amount` is then deducted * from the caller's allowance. * * See {_burn} and {_approve}. */ function _burnFrom(address account, uint256 amount) internal { _burn(account, amount); _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance")); } }
/openzeppelin-solidity/contracts/token/ERC20/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":"bool","name":"test","internalType":"bool"}]},{"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":"Revocation","inputs":[{"type":"bytes32","name":"identifier","internalType":"bytes32","indexed":true},{"type":"address","name":"by","internalType":"address","indexed":true},{"type":"address","name":"token","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false},{"type":"address","name":"paymentId","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"bytes32","name":"identifier","internalType":"bytes32","indexed":true},{"type":"address","name":"token","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false},{"type":"address","name":"paymentId","internalType":"address","indexed":false},{"type":"uint256","name":"minAttestations","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Withdrawal","inputs":[{"type":"bytes32","name":"identifier","internalType":"bytes32","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"address","name":"token","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false},{"type":"address","name":"paymentId","internalType":"address","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"recipientIdentifier","internalType":"bytes32"},{"type":"address","name":"sender","internalType":"address"},{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"sentIndex","internalType":"uint256"},{"type":"uint256","name":"receivedIndex","internalType":"uint256"},{"type":"uint256","name":"timestamp","internalType":"uint256"},{"type":"uint256","name":"expirySeconds","internalType":"uint256"},{"type":"uint256","name":"minAttestations","internalType":"uint256"}],"name":"escrowedPayments","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"getReceivedPaymentIds","inputs":[{"type":"bytes32","name":"identifier","internalType":"bytes32"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"getSentPaymentIds","inputs":[{"type":"address","name":"sender","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"getVersionNumber","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"initialize","inputs":[{"type":"address","name":"registryAddress","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"initialized","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":"address"}],"name":"receivedPaymentIds","inputs":[{"type":"bytes32","name":"","internalType":"bytes32"},{"type":"uint256","name":"","internalType":"uint256"}],"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":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"revoke","inputs":[{"type":"address","name":"paymentId","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"sentPaymentIds","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"uint256","name":"","internalType":"uint256"}],"constant":true},{"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":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"bytes32","name":"identifier","internalType":"bytes32"},{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"expirySeconds","internalType":"uint256"},{"type":"address","name":"paymentId","internalType":"address"},{"type":"uint256","name":"minAttestations","internalType":"uint256"}],"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":[{"type":"bool","name":"","internalType":"bool"}],"name":"withdraw","inputs":[{"type":"address","name":"paymentId","internalType":"address"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}],"constant":false}]
Contract Creation Code
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