Address Details
contract
0x893120B08e86ACF40998BB16880ACB0B8efC25F0
- Contract Name
- Accounts
- Creator
- 0x456f41–3584da at 0x73e3de–a26ec0
- 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
- 5 Transactions
- Transfers
- 0 Transfers
- Gas Used
- 137,591
- Last Balance Update
- 20962892
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- Contract name:
- Accounts
- Optimization enabled
- false
- Compiler version
- v0.5.13+commit.5b0b510c
- EVM Version
- istanbul
- Verified at
- 2022-06-15T11:13:36.372650Z
/Users/mchrzan/celo/celo-monorepo/packages/protocol/contracts/common/Accounts.sol
pragma solidity ^0.5.13; import "openzeppelin-solidity/contracts/math/SafeMath.sol"; import "openzeppelin-solidity/contracts/ownership/Ownable.sol"; import "./interfaces/IAccounts.sol"; import "../common/FixidityLib.sol"; import "../common/Initializable.sol"; import "../common/interfaces/ICeloVersionedContract.sol"; import "../common/Signatures.sol"; import "../common/UsingRegistry.sol"; import "../common/libraries/ReentrancyGuard.sol"; contract Accounts is IAccounts, ICeloVersionedContract, Ownable, ReentrancyGuard, Initializable, UsingRegistry { using FixidityLib for FixidityLib.Fraction; using SafeMath for uint256; struct Signers { // The address that is authorized to vote in governance and validator elections on behalf of the // account. The account can vote as well, whether or not a vote signing key has been specified. address vote; // The address that is authorized to manage a validator or validator group and sign consensus // messages on behalf of the account. The account can manage the validator, whether or not a // validator signing key has been specified. However, if a validator signing key has been // specified, only that key may actually participate in consensus. address validator; // The address of the key with which this account wants to sign attestations on the Attestations // contract address attestation; } struct SignerAuthorization { bool started; bool completed; } struct Account { bool exists; // [Deprecated] Each account may authorize signing keys to use for voting, // validating or attestation. These keys may not be keys of other accounts, // and may not be authorized by any other account for any purpose. Signers signers; // The address at which the account expects to receive transfers. If it's empty/0x0, the // account indicates that an address exchange should be initiated with the dataEncryptionKey address walletAddress; // An optional human readable identifier for the account string name; // The ECDSA public key used to encrypt and decrypt data for this account bytes dataEncryptionKey; // The URL under which an account adds metadata and claims string metadataURL; } struct PaymentDelegation { // Address that should receive a fraction of validator payments. address beneficiary; // Fraction of payment to delegate to `beneficiary`. FixidityLib.Fraction fraction; } mapping(address => Account) internal accounts; // Maps authorized signers to the account that provided the authorization. mapping(address => address) public authorizedBy; // Default signers by account (replaces the legacy Signers struct on Account) mapping(address => mapping(bytes32 => address)) defaultSigners; // All signers and their roles for a given account // solhint-disable-next-line max-line-length mapping(address => mapping(bytes32 => mapping(address => SignerAuthorization))) signerAuthorizations; bytes32 public constant EIP712_AUTHORIZE_SIGNER_TYPEHASH = keccak256( "AuthorizeSigner(address account,address signer,bytes32 role)" ); bytes32 public eip712DomainSeparator; // A per-account list of CIP8 storage roots, bypassing CIP3. mapping(address => bytes[]) public offchainStorageRoots; // Optional per-account validator payment delegation information. mapping(address => PaymentDelegation) internal paymentDelegations; bytes32 constant ValidatorSigner = keccak256(abi.encodePacked("celo.org/core/validator")); bytes32 constant AttestationSigner = keccak256(abi.encodePacked("celo.org/core/attestation")); bytes32 constant VoteSigner = keccak256(abi.encodePacked("celo.org/core/vote")); event AttestationSignerAuthorized(address indexed account, address signer); event VoteSignerAuthorized(address indexed account, address signer); event ValidatorSignerAuthorized(address indexed account, address signer); event SignerAuthorized(address indexed account, address signer, bytes32 indexed role); event SignerAuthorizationStarted(address indexed account, address signer, bytes32 indexed role); event SignerAuthorizationCompleted(address indexed account, address signer, bytes32 indexed role); event AttestationSignerRemoved(address indexed account, address oldSigner); event VoteSignerRemoved(address indexed account, address oldSigner); event ValidatorSignerRemoved(address indexed account, address oldSigner); event IndexedSignerSet(address indexed account, address signer, bytes32 role); event IndexedSignerRemoved(address indexed account, address oldSigner, bytes32 role); event DefaultSignerSet(address indexed account, address signer, bytes32 role); event DefaultSignerRemoved(address indexed account, address oldSigner, bytes32 role); event LegacySignerSet(address indexed account, address signer, bytes32 role); event LegacySignerRemoved(address indexed account, address oldSigner, bytes32 role); event SignerRemoved(address indexed account, address oldSigner, bytes32 indexed role); event AccountDataEncryptionKeySet(address indexed account, bytes dataEncryptionKey); event AccountNameSet(address indexed account, string name); event AccountMetadataURLSet(address indexed account, string metadataURL); event AccountWalletAddressSet(address indexed account, address walletAddress); event AccountCreated(address indexed account); event OffchainStorageRootAdded(address indexed account, bytes url); event OffchainStorageRootRemoved(address indexed account, bytes url, uint256 index); event PaymentDelegationSet(address indexed beneficiary, uint256 fraction); /** * @notice Sets initialized == true on implementation contracts * @param test Set to true to skip implementation initialization */ constructor(bool test) public Initializable(test) {} /** * @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, 4, 0); } /** * @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); setEip712DomainSeparator(); } /** * @notice Sets the EIP712 domain separator for the Celo Accounts abstraction. */ function setEip712DomainSeparator() public { uint256 chainId; assembly { chainId := chainid } eip712DomainSeparator = keccak256( abi.encode( keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ), keccak256(bytes("Celo Core Contracts")), keccak256("1.0"), chainId, address(this) ) ); } /** * @notice Convenience Setter for the dataEncryptionKey and wallet address for an account * @param name A string to set as the name of the account * @param dataEncryptionKey secp256k1 public key for data encryption. Preferably compressed. * @param walletAddress The wallet address to set for the account * @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 v, r, s constitute `signer`'s signature on `msg.sender` (unless the wallet address * is 0x0 or msg.sender). */ function setAccount( string calldata name, bytes calldata dataEncryptionKey, address walletAddress, uint8 v, bytes32 r, bytes32 s ) external { if (!isAccount(msg.sender)) { createAccount(); } setName(name); setAccountDataEncryptionKey(dataEncryptionKey); setWalletAddress(walletAddress, v, r, s); } /** * @notice Creates an account. * @return True if account creation succeeded. */ function createAccount() public returns (bool) { require(isNotAccount(msg.sender) && isNotAuthorizedSigner(msg.sender), "Account exists"); Account storage account = accounts[msg.sender]; account.exists = true; emit AccountCreated(msg.sender); return true; } /** * @notice Setter for the name of an account. * @param name The name to set. */ function setName(string memory name) public { require(isAccount(msg.sender), "Unknown account"); Account storage account = accounts[msg.sender]; account.name = name; emit AccountNameSet(msg.sender, name); } /** * @notice Setter for the wallet address for an account * @param walletAddress The wallet address to set for the account * @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 Wallet address can be zero. This means that the owner of the wallet * does not want to be paid directly without interaction, and instead wants users to * contact them, using the data encryption key, and arrange a payment. * @dev v, r, s constitute `signer`'s signature on `msg.sender` (unless the wallet address * is 0x0 or msg.sender). */ function setWalletAddress(address walletAddress, uint8 v, bytes32 r, bytes32 s) public { require(isAccount(msg.sender), "Unknown account"); if (!(walletAddress == msg.sender || walletAddress == address(0x0))) { address signer = Signatures.getSignerOfAddress(msg.sender, v, r, s); require(signer == walletAddress, "Invalid signature"); } Account storage account = accounts[msg.sender]; account.walletAddress = walletAddress; emit AccountWalletAddressSet(msg.sender, walletAddress); } /** * @notice Setter for the data encryption key and version. * @param dataEncryptionKey secp256k1 public key for data encryption. Preferably compressed. */ function setAccountDataEncryptionKey(bytes memory dataEncryptionKey) public { require(dataEncryptionKey.length >= 33, "data encryption key length <= 32"); Account storage account = accounts[msg.sender]; account.dataEncryptionKey = dataEncryptionKey; emit AccountDataEncryptionKeySet(msg.sender, dataEncryptionKey); } /** * @notice Setter for the metadata of an account. * @param metadataURL The URL to access the metadata. */ function setMetadataURL(string calldata metadataURL) external { require(isAccount(msg.sender), "Unknown account"); Account storage account = accounts[msg.sender]; account.metadataURL = metadataURL; emit AccountMetadataURLSet(msg.sender, metadataURL); } /** * @notice Adds a new CIP8 storage root. * @param url The URL pointing to the offchain storage root. */ function addStorageRoot(bytes calldata url) external { require(isAccount(msg.sender), "Unknown account"); offchainStorageRoots[msg.sender].push(url); emit OffchainStorageRootAdded(msg.sender, url); } /** * @notice Removes a CIP8 storage root. * @param index The index of the storage root to be removed in the account's * list of storage roots. * @dev The order of storage roots may change after this operation (the last * storage root will be moved to `index`), be aware of this if removing * multiple storage roots at a time. */ function removeStorageRoot(uint256 index) external { require(isAccount(msg.sender), "Unknown account"); require(index < offchainStorageRoots[msg.sender].length, "Invalid storage root index"); uint256 lastIndex = offchainStorageRoots[msg.sender].length - 1; bytes memory url = offchainStorageRoots[msg.sender][index]; offchainStorageRoots[msg.sender][index] = offchainStorageRoots[msg.sender][lastIndex]; offchainStorageRoots[msg.sender].length--; emit OffchainStorageRootRemoved(msg.sender, url, index); } /** * @notice Returns the full list of offchain storage roots for an account. * @param account The account whose storage roots to return. * @return List of storage root URLs. */ function getOffchainStorageRoots(address account) external view returns (bytes memory, uint256[] memory) { require(isAccount(account), "Unknown account"); uint256 numberRoots = offchainStorageRoots[account].length; uint256 totalLength = 0; for (uint256 i = 0; i < numberRoots; i++) { totalLength = totalLength.add(offchainStorageRoots[account][i].length); } bytes memory concatenated = new bytes(totalLength); uint256 lastIndex = 0; uint256[] memory lengths = new uint256[](numberRoots); for (uint256 i = 0; i < numberRoots; i++) { bytes storage root = offchainStorageRoots[account][i]; lengths[i] = root.length; for (uint256 j = 0; j < lengths[i]; j++) { concatenated[lastIndex] = root[j]; lastIndex++; } } return (concatenated, lengths); } /** * @notice Sets validator payment delegation settings. * @param beneficiary The address that should receive a portion of validator * payments. * @param fraction The fraction of the validator's payment that should be * diverted to `beneficiary` every epoch, given as FixidityLib value. Must not * be greater than 1. * @dev Use `deletePaymentDelegation` to unset the payment delegation. */ function setPaymentDelegation(address beneficiary, uint256 fraction) public { require(isAccount(msg.sender), "Not an account"); require(beneficiary != address(0), "Beneficiary cannot be address 0x0"); FixidityLib.Fraction memory f = FixidityLib.wrap(fraction); require(f.lte(FixidityLib.fixed1()), "Fraction must not be greater than 1"); paymentDelegations[msg.sender] = PaymentDelegation(beneficiary, f); emit PaymentDelegationSet(beneficiary, fraction); } /** * @notice Removes a validator's payment delegation by setting benficiary and * fraction to 0. */ function deletePaymentDelegation() public { require(isAccount(msg.sender), "Not an account"); paymentDelegations[msg.sender] = PaymentDelegation(address(0x0), FixidityLib.wrap(0)); emit PaymentDelegationSet(address(0x0), 0); } /** * @notice Gets validator payment delegation settings. * @param account Account of the validator. * @return Beneficiary address and fraction of payment delegated. */ function getPaymentDelegation(address account) external view returns (address, uint256) { PaymentDelegation storage delegation = paymentDelegations[account]; return (delegation.beneficiary, delegation.fraction.unwrap()); } /** * @notice Set the indexed signer for a specific role * @param signer the address to set as default * @param role the role to register a default signer for */ function setIndexedSigner(address signer, bytes32 role) public { require(isAccount(msg.sender), "Not an account"); require(isNotAccount(signer), "Cannot authorize account as signer"); require( isNotAuthorizedSignerForAnotherAccount(msg.sender, signer), "Not a signer for this account" ); require(isSigner(msg.sender, signer, role), "Must authorize signer before setting as default"); Account storage account = accounts[msg.sender]; if (isLegacyRole(role)) { if (role == VoteSigner) { account.signers.vote = signer; } else if (role == AttestationSigner) { account.signers.attestation = signer; } else if (role == ValidatorSigner) { account.signers.validator = signer; } emit LegacySignerSet(msg.sender, signer, role); } else { defaultSigners[msg.sender][role] = signer; emit DefaultSignerSet(msg.sender, signer, role); } emit IndexedSignerSet(msg.sender, signer, role); } /** * @notice Authorizes an address to act as a signer, for `role`, on behalf of the account. * @param signer The address of the signing key to authorize. * @param role The role to authorize signing for. * @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 v, r, s constitute `signer`'s EIP712 signature over `role`, `msg.sender` * and `signer`. */ function authorizeSignerWithSignature(address signer, bytes32 role, uint8 v, bytes32 r, bytes32 s) public { authorizeAddressWithRole(signer, role, v, r, s); signerAuthorizations[msg.sender][role][signer] = SignerAuthorization({ started: true, completed: true }); emit SignerAuthorized(msg.sender, signer, role); } function legacyAuthorizeSignerWithSignature( address signer, bytes32 role, uint8 v, bytes32 r, bytes32 s ) private { authorizeAddress(signer, v, r, s); signerAuthorizations[msg.sender][role][signer] = SignerAuthorization({ started: true, completed: true }); emit SignerAuthorized(msg.sender, signer, role); } /** * @notice Authorizes an address to sign votes on behalf of the account. * @param signer The address of the signing key to authorize. * @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 v, r, s constitute `signer`'s signature on `msg.sender`. */ function authorizeVoteSigner(address signer, uint8 v, bytes32 r, bytes32 s) external nonReentrant { legacyAuthorizeSignerWithSignature(signer, VoteSigner, v, r, s); setIndexedSigner(signer, VoteSigner); emit VoteSignerAuthorized(msg.sender, signer); } /** * @notice Authorizes an address to sign consensus messages on behalf of the account. * @param signer The address of the signing key to authorize. * @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 v, r, s constitute `signer`'s signature on `msg.sender`. */ function authorizeValidatorSigner(address signer, uint8 v, bytes32 r, bytes32 s) external nonReentrant { legacyAuthorizeSignerWithSignature(signer, ValidatorSigner, v, r, s); setIndexedSigner(signer, ValidatorSigner); require(!getValidators().isValidator(msg.sender), "Cannot authorize validator signer"); emit ValidatorSignerAuthorized(msg.sender, signer); } /** * @notice Authorizes an address to sign consensus messages on behalf of the account. * @param signer The address of the signing key to authorize. * @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. * @param ecdsaPublicKey The ECDSA public key corresponding to `signer`. * @dev v, r, s constitute `signer`'s signature on `msg.sender`. */ function authorizeValidatorSignerWithPublicKey( address signer, uint8 v, bytes32 r, bytes32 s, bytes calldata ecdsaPublicKey ) external nonReentrant { legacyAuthorizeSignerWithSignature(signer, ValidatorSigner, v, r, s); setIndexedSigner(signer, ValidatorSigner); require( getValidators().updateEcdsaPublicKey(msg.sender, signer, ecdsaPublicKey), "Failed to update ECDSA public key" ); emit ValidatorSignerAuthorized(msg.sender, signer); } /** * @notice Authorizes an address to sign consensus messages on behalf of the account. * @param signer The address of the signing key to authorize. * @param ecdsaPublicKey The ECDSA public key corresponding to `signer`. * @param blsPublicKey The BLS public key that the validator is using for consensus, should pass * proof of possession. 96 bytes. * @param blsPop The BLS public key proof-of-possession, which consists of a signature on the * account address. 48 bytes. * @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 v, r, s constitute `signer`'s signature on `msg.sender`. */ function authorizeValidatorSignerWithKeys( address signer, uint8 v, bytes32 r, bytes32 s, bytes calldata ecdsaPublicKey, bytes calldata blsPublicKey, bytes calldata blsPop ) external nonReentrant { legacyAuthorizeSignerWithSignature(signer, ValidatorSigner, v, r, s); setIndexedSigner(signer, ValidatorSigner); require( getValidators().updatePublicKeys(msg.sender, signer, ecdsaPublicKey, blsPublicKey, blsPop), "Failed to update validator keys" ); emit ValidatorSignerAuthorized(msg.sender, signer); } /** * @notice Authorizes an address to sign attestations on behalf of the account. * @param signer The address of the signing key to authorize. * @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 v, r, s constitute `signer`'s signature on `msg.sender`. */ function authorizeAttestationSigner(address signer, uint8 v, bytes32 r, bytes32 s) public { legacyAuthorizeSignerWithSignature(signer, AttestationSigner, v, r, s); setIndexedSigner(signer, AttestationSigner); emit AttestationSignerAuthorized(msg.sender, signer); } /** * @notice Begin the process of authorizing an address to sign on behalf of the account * @param signer The address of the signing key to authorize. * @param role The role to authorize signing for. */ function authorizeSigner(address signer, bytes32 role) public { require(isAccount(msg.sender), "Unknown account"); require( isNotAccount(signer) && isNotAuthorizedSignerForAnotherAccount(msg.sender, signer), "Cannot re-authorize address signer" ); signerAuthorizations[msg.sender][role][signer] = SignerAuthorization({ started: true, completed: false }); emit SignerAuthorizationStarted(msg.sender, signer, role); } /** * @notice Finish the process of authorizing an address to sign on behalf of the account. * @param account The address of account that authorized signing. * @param role The role to finish authorizing for. */ function completeSignerAuthorization(address account, bytes32 role) public { require(isAccount(account), "Unknown account"); require( isNotAccount(msg.sender) && isNotAuthorizedSignerForAnotherAccount(account, msg.sender), "Cannot re-authorize address signer" ); require( signerAuthorizations[account][role][msg.sender].started == true, "Signer authorization not started" ); authorizedBy[msg.sender] = account; signerAuthorizations[account][role][msg.sender].completed = true; emit SignerAuthorizationCompleted(account, msg.sender, role); } /** * @notice Whether or not the signer has been registered as the legacy signer for role * @param _account The address of account that authorized signing. * @param signer The address of the signer. * @param role The role that has been authorized. */ function isLegacySigner(address _account, address signer, bytes32 role) public view returns (bool) { Account storage account = accounts[_account]; if (role == ValidatorSigner && account.signers.validator == signer) { return true; } else if (role == AttestationSigner && account.signers.attestation == signer) { return true; } else if (role == VoteSigner && account.signers.vote == signer) { return true; } else { return false; } } /** * @notice Whether or not the signer has been registered as the default signer for role * @param account The address of account that authorized signing. * @param signer The address of the signer. * @param role The role that has been authorized. */ function isDefaultSigner(address account, address signer, bytes32 role) public view returns (bool) { return defaultSigners[account][role] == signer; } /** * @notice Whether or not the signer has been registered as an indexed signer for role * @param account The address of account that authorized signing. * @param signer The address of the signer. * @param role The role that has been authorized. */ function isIndexedSigner(address account, address signer, bytes32 role) public view returns (bool) { return isLegacyRole(role) ? isLegacySigner(account, signer, role) : isDefaultSigner(account, signer, role); } /** * @notice Whether or not the signer has been registered as a signer for role * @param account The address of account that authorized signing. * @param signer The address of the signer. * @param role The role that has been authorized. */ function isSigner(address account, address signer, bytes32 role) public view returns (bool) { return isLegacySigner(account, signer, role) || (signerAuthorizations[account][role][signer].completed && authorizedBy[signer] == account); } /** * @notice Removes the signer for a default role. * @param role The role that has been authorized. */ function removeDefaultSigner(bytes32 role) public { address signer = defaultSigners[msg.sender][role]; defaultSigners[msg.sender][role] = address(0); emit DefaultSignerRemoved(msg.sender, signer, role); } /** * @notice Remove one of the Validator, Attestation or * Vote signers from an account. Should only be called from * methods that check the role is a legacy signer. * @param role The role that has been authorized. */ function removeLegacySigner(bytes32 role) private { Account storage account = accounts[msg.sender]; address signer; if (role == ValidatorSigner) { signer = account.signers.validator; account.signers.validator = address(0); } else if (role == AttestationSigner) { signer = account.signers.attestation; account.signers.attestation = address(0); } else if (role == VoteSigner) { signer = account.signers.vote; account.signers.vote = address(0); } emit LegacySignerRemoved(msg.sender, signer, role); } /** * @notice Removes the currently authorized and indexed signer * for a specific role * @param role The role of the signer. */ function removeIndexedSigner(bytes32 role) public { address oldSigner = getIndexedSigner(msg.sender, role); isLegacyRole(role) ? removeLegacySigner(role) : removeDefaultSigner(role); emit IndexedSignerRemoved(msg.sender, oldSigner, role); } /** * @notice Removes the currently authorized signer for a specific role and * if the signer is indexed, remove that as well. * @param signer The address of the signer. * @param role The role that has been authorized. */ function removeSigner(address signer, bytes32 role) public { if (isIndexedSigner(msg.sender, signer, role)) { removeIndexedSigner(role); } delete signerAuthorizations[msg.sender][role][signer]; emit SignerRemoved(msg.sender, signer, role); } /** * @notice Removes the currently authorized vote signer for the account. * Note that the signers cannot be reauthorized after they have been removed. */ function removeVoteSigner() public { address signer = getLegacySigner(msg.sender, VoteSigner); removeSigner(signer, VoteSigner); emit VoteSignerRemoved(msg.sender, signer); } /** * @notice Removes the currently authorized validator signer for the account * Note that the signers cannot be reauthorized after they have been removed. */ function removeValidatorSigner() public { address signer = getLegacySigner(msg.sender, ValidatorSigner); removeSigner(signer, ValidatorSigner); emit ValidatorSignerRemoved(msg.sender, signer); } /** * @notice Removes the currently authorized attestation signer for the account * Note that the signers cannot be reauthorized after they have been removed. */ function removeAttestationSigner() public { address signer = getLegacySigner(msg.sender, AttestationSigner); removeSigner(signer, AttestationSigner); emit AttestationSignerRemoved(msg.sender, signer); } function signerToAccountWithRole(address signer, bytes32 role) internal view returns (address) { address account = authorizedBy[signer]; if (account != address(0)) { require(isSigner(account, signer, role), "not active authorized signer for role"); return account; } require(isAccount(signer), "not an account"); return signer; } /** * @notice Returns the account associated with `signer`. * @param signer The address of the account or currently authorized attestation signer. * @dev Fails if the `signer` is not an account or currently authorized attestation signer. * @return The associated account. */ function attestationSignerToAccount(address signer) external view returns (address) { return signerToAccountWithRole(signer, AttestationSigner); } /** * @notice Returns the account associated with `signer`. * @param signer The address of an account or currently authorized validator signer. * @dev Fails if the `signer` is not an account or currently authorized validator. * @return The associated account. */ function validatorSignerToAccount(address signer) public view returns (address) { return signerToAccountWithRole(signer, ValidatorSigner); } /** * @notice Returns the account associated with `signer`. * @param signer The address of the account or currently authorized vote signer. * @dev Fails if the `signer` is not an account or currently authorized vote signer. * @return The associated account. */ function voteSignerToAccount(address signer) external view returns (address) { return signerToAccountWithRole(signer, VoteSigner); } /** * @notice Returns the account associated with `signer`. * @param signer The address of the account or previously authorized signer. * @dev Fails if the `signer` is not an account or previously authorized signer. * @return The associated account. */ function signerToAccount(address signer) external view returns (address) { address authorizingAccount = authorizedBy[signer]; if (authorizingAccount != address(0)) { return authorizingAccount; } else { require(isAccount(signer), "Not an account"); return signer; } } /** * @notice Checks whether the role is one of Vote, Validator or Attestation * @param role The role to check */ function isLegacyRole(bytes32 role) public pure returns (bool) { return role == VoteSigner || role == ValidatorSigner || role == AttestationSigner; } /** * @notice Returns the legacy signer for the specified account and * role. If no signer has been specified it will return the account itself. * @param _account The address of the account. * @param role The role of the signer. */ function getLegacySigner(address _account, bytes32 role) public view returns (address) { require(isLegacyRole(role), "Role is not a legacy signer"); Account storage account = accounts[_account]; address signer; if (role == ValidatorSigner) { signer = account.signers.validator; } else if (role == AttestationSigner) { signer = account.signers.attestation; } else if (role == VoteSigner) { signer = account.signers.vote; } return signer == address(0) ? _account : signer; } /** * @notice Returns the default signer for the specified account and * role. If no signer has been specified it will return the account itself. * @param account The address of the account. * @param role The role of the signer. */ function getDefaultSigner(address account, bytes32 role) public view returns (address) { address defaultSigner = defaultSigners[account][role]; return defaultSigner == address(0) ? account : defaultSigner; } /** * @notice Returns the indexed signer for the specified account and role. * If no signer has been specified it will return the account itself. * @param account The address of the account. * @param role The role of the signer. */ function getIndexedSigner(address account, bytes32 role) public view returns (address) { return isLegacyRole(role) ? getLegacySigner(account, role) : getDefaultSigner(account, role); } /** * @notice Returns the vote signer for the specified account. * @param account The address of the account. * @return The address with which the account can sign votes. */ function getVoteSigner(address account) public view returns (address) { return getLegacySigner(account, VoteSigner); } /** * @notice Returns the validator signer for the specified account. * @param account The address of the account. * @return The address with which the account can register a validator or group. */ function getValidatorSigner(address account) public view returns (address) { return getLegacySigner(account, ValidatorSigner); } /** * @notice Returns the attestation signer for the specified account. * @param account The address of the account. * @return The address with which the account can sign attestations. */ function getAttestationSigner(address account) public view returns (address) { return getLegacySigner(account, AttestationSigner); } /** * @notice Checks whether or not the account has an indexed signer * registered for one of the legacy roles */ function hasLegacySigner(address account, bytes32 role) public view returns (bool) { return getLegacySigner(account, role) != account; } /** * @notice Checks whether or not the account has an indexed signer * registered for a role */ function hasDefaultSigner(address account, bytes32 role) public view returns (bool) { return getDefaultSigner(account, role) != account; } /** * @notice Checks whether or not the account has an indexed signer * registered for the role */ function hasIndexedSigner(address account, bytes32 role) public view returns (bool) { return isLegacyRole(role) ? hasLegacySigner(account, role) : hasDefaultSigner(account, role); } /** * @notice Checks whether or not the account has a signer * registered for the plaintext role. * @dev See `hasIndexedSigner` for more gas efficient call. */ function hasAuthorizedSigner(address account, string calldata role) external view returns (bool) { return hasIndexedSigner(account, keccak256(abi.encodePacked(role))); } /** * @notice Returns if account has specified a dedicated vote signer. * @param account The address of the account. * @return Whether the account has specified a dedicated vote signer. */ function hasAuthorizedVoteSigner(address account) external view returns (bool) { return hasLegacySigner(account, VoteSigner); } /** * @notice Returns if account has specified a dedicated validator signer. * @param account The address of the account. * @return Whether the account has specified a dedicated validator signer. */ function hasAuthorizedValidatorSigner(address account) external view returns (bool) { return hasLegacySigner(account, ValidatorSigner); } /** * @notice Returns if account has specified a dedicated attestation signer. * @param account The address of the account. * @return Whether the account has specified a dedicated attestation signer. */ function hasAuthorizedAttestationSigner(address account) external view returns (bool) { return hasLegacySigner(account, AttestationSigner); } /** * @notice Getter for the name of an account. * @param account The address of the account to get the name for. * @return name The name of the account. */ function getName(address account) external view returns (string memory) { return accounts[account].name; } /** * @notice Getter for the metadata of an account. * @param account The address of the account to get the metadata for. * @return metadataURL The URL to access the metadata. */ function getMetadataURL(address account) external view returns (string memory) { return accounts[account].metadataURL; } /** * @notice Getter for the metadata of multiple accounts. * @param accountsToQuery The addresses of the accounts to get the metadata for. * @return (stringLengths[] - the length of each string in bytes * data - all strings concatenated * ) */ function batchGetMetadataURL(address[] calldata accountsToQuery) external view returns (uint256[] memory, bytes memory) { uint256 totalSize = 0; uint256[] memory sizes = new uint256[](accountsToQuery.length); for (uint256 i = 0; i < accountsToQuery.length; i = i.add(1)) { sizes[i] = bytes(accounts[accountsToQuery[i]].metadataURL).length; totalSize = totalSize.add(sizes[i]); } bytes memory data = new bytes(totalSize); uint256 pointer = 0; for (uint256 i = 0; i < accountsToQuery.length; i = i.add(1)) { for (uint256 j = 0; j < sizes[i]; j = j.add(1)) { data[pointer] = bytes(accounts[accountsToQuery[i]].metadataURL)[j]; pointer = pointer.add(1); } } return (sizes, data); } /** * @notice Getter for the data encryption key and version. * @param account The address of the account to get the key for * @return dataEncryptionKey secp256k1 public key for data encryption. Preferably compressed. */ function getDataEncryptionKey(address account) external view returns (bytes memory) { return accounts[account].dataEncryptionKey; } /** * @notice Getter for the wallet address for an account * @param account The address of the account to get the wallet address for * @return Wallet address */ function getWalletAddress(address account) external view returns (address) { return accounts[account].walletAddress; } /** * @notice Check if an account already exists. * @param account The address of the account * @return Returns `true` if account exists. Returns `false` otherwise. */ function isAccount(address account) public view returns (bool) { return (accounts[account].exists); } /** * @notice Check if an account already exists. * @param account The address of the account * @return Returns `false` if account exists. Returns `true` otherwise. */ function isNotAccount(address account) internal view returns (bool) { return (!accounts[account].exists); } /** * @notice Check if an address has been an authorized signer for an account. * @param signer The possibly authorized address. * @return Returns `true` if authorized. Returns `false` otherwise. */ function isAuthorizedSigner(address signer) external view returns (bool) { return (authorizedBy[signer] != address(0)); } /** * @notice Check if an address has not been an authorized signer for an account. * @param signer The possibly authorized address. * @return Returns `false` if authorized. Returns `true` otherwise. */ function isNotAuthorizedSigner(address signer) internal view returns (bool) { return (authorizedBy[signer] == address(0)); } /** * @notice Check if `signer` has not been authorized, and if it has been previously * authorized that it was authorized by `account`. * @param account The authorizing account address. * @param signer The possibly authorized address. * @return Returns `false` if authorized. Returns `true` otherwise. */ function isNotAuthorizedSignerForAnotherAccount(address account, address signer) internal view returns (bool) { return (authorizedBy[signer] == address(0) || authorizedBy[signer] == account); } /** * @notice Authorizes some role of `msg.sender`'s account to another address. * @param authorized The address to authorize. * @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 Fails if the address is already authorized to another account or is an account itself. * @dev Note that once an address is authorized, it may never be authorized again. * @dev v, r, s constitute `authorized`'s signature on `msg.sender`. */ function authorizeAddress(address authorized, uint8 v, bytes32 r, bytes32 s) private { address signer = Signatures.getSignerOfAddress(msg.sender, v, r, s); require(signer == authorized, "Invalid signature"); authorize(authorized); } /** * @notice Returns the address that signed the provided role authorization. * @param account The `account` property signed over in the EIP712 signature * @param signer The `signer` property signed over in the EIP712 signature * @param role The `role` property signed over in the EIP712 signature * @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. * @return The address that signed the provided role authorization. */ function getRoleAuthorizationSigner( address account, address signer, bytes32 role, uint8 v, bytes32 r, bytes32 s ) public view returns (address) { bytes32 structHash = keccak256( abi.encode(EIP712_AUTHORIZE_SIGNER_TYPEHASH, account, signer, role) ); return Signatures.getSignerOfTypedDataHash(eip712DomainSeparator, structHash, v, r, s); } /** * @notice Authorizes a role of `msg.sender`'s account to another address (`authorized`). * @param authorized The address to authorize. * @param role The role to authorize. * @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 Fails if the address is already authorized to another account or is an account itself. * @dev Note that this signature is EIP712 compliant over the authorizing `account` * (`msg.sender`), `signer` (`authorized`) and `role`. */ function authorizeAddressWithRole(address authorized, bytes32 role, uint8 v, bytes32 r, bytes32 s) private { address signer = getRoleAuthorizationSigner(msg.sender, authorized, role, v, r, s); require(signer == authorized, "Invalid signature"); authorize(authorized); } /** * @notice Authorizes an address to `msg.sender`'s account * @param authorized The address to authorize. * @dev Fails if the address is already authorized for another account or is an account itself. */ function authorize(address authorized) private { require(isAccount(msg.sender), "Unknown account"); require( isNotAccount(authorized) && isNotAuthorizedSignerForAnotherAccount(msg.sender, authorized), "Cannot re-authorize address or locked gold account for another account" ); authorizedBy[authorized] = msg.sender; } }
/Users/mchrzan/celo/celo-monorepo/packages/protocol/contracts/common/FixidityLib.sol
pragma solidity ^0.5.13; /** * @title FixidityLib * @author Gadi Guy, Alberto Cuesta Canada * @notice This library provides fixed point arithmetic with protection against * overflow. * All operations are done with uint256 and the operands must have been created * with any of the newFrom* functions, which shift the comma digits() to the * right and check for limits, or with wrap() which expects a number already * in the internal representation of a fraction. * When using this library be sure to use maxNewFixed() as the upper limit for * creation of fixed point numbers. * @dev All contained functions are pure and thus marked internal to be inlined * on consuming contracts at compile time for gas efficiency. */ library FixidityLib { struct Fraction { uint256 value; } /** * @notice Number of positions that the comma is shifted to the right. */ function digits() internal pure returns (uint8) { return 24; } uint256 private constant FIXED1_UINT = 1000000000000000000000000; /** * @notice This is 1 in the fixed point units used in this library. * @dev Test fixed1() equals 10^digits() * Hardcoded to 24 digits. */ function fixed1() internal pure returns (Fraction memory) { return Fraction(FIXED1_UINT); } /** * @notice Wrap a uint256 that represents a 24-decimal fraction in a Fraction * struct. * @param x Number that already represents a 24-decimal fraction. * @return A Fraction struct with contents x. */ function wrap(uint256 x) internal pure returns (Fraction memory) { return Fraction(x); } /** * @notice Unwraps the uint256 inside of a Fraction struct. */ function unwrap(Fraction memory x) internal pure returns (uint256) { return x.value; } /** * @notice The amount of decimals lost on each multiplication operand. * @dev Test mulPrecision() equals sqrt(fixed1) */ function mulPrecision() internal pure returns (uint256) { return 1000000000000; } /** * @notice Maximum value that can be converted to fixed point. Optimize for deployment. * @dev * Test maxNewFixed() equals maxUint256() / fixed1() */ function maxNewFixed() internal pure returns (uint256) { return 115792089237316195423570985008687907853269984665640564; } /** * @notice Converts a uint256 to fixed point Fraction * @dev Test newFixed(0) returns 0 * Test newFixed(1) returns fixed1() * Test newFixed(maxNewFixed()) returns maxNewFixed() * fixed1() * Test newFixed(maxNewFixed()+1) fails */ function newFixed(uint256 x) internal pure returns (Fraction memory) { require(x <= maxNewFixed(), "can't create fixidity number larger than maxNewFixed()"); return Fraction(x * FIXED1_UINT); } /** * @notice Converts a uint256 in the fixed point representation of this * library to a non decimal. All decimal digits will be truncated. */ function fromFixed(Fraction memory x) internal pure returns (uint256) { return x.value / FIXED1_UINT; } /** * @notice Converts two uint256 representing a fraction to fixed point units, * equivalent to multiplying dividend and divisor by 10^digits(). * @param numerator numerator must be <= maxNewFixed() * @param denominator denominator must be <= maxNewFixed() and denominator can't be 0 * @dev * Test newFixedFraction(1,0) fails * Test newFixedFraction(0,1) returns 0 * Test newFixedFraction(1,1) returns fixed1() * Test newFixedFraction(1,fixed1()) returns 1 */ function newFixedFraction(uint256 numerator, uint256 denominator) internal pure returns (Fraction memory) { Fraction memory convertedNumerator = newFixed(numerator); Fraction memory convertedDenominator = newFixed(denominator); return divide(convertedNumerator, convertedDenominator); } /** * @notice Returns the integer part of a fixed point number. * @dev * Test integer(0) returns 0 * Test integer(fixed1()) returns fixed1() * Test integer(newFixed(maxNewFixed())) returns maxNewFixed()*fixed1() */ function integer(Fraction memory x) internal pure returns (Fraction memory) { return Fraction((x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow } /** * @notice Returns the fractional part of a fixed point number. * In the case of a negative number the fractional is also negative. * @dev * Test fractional(0) returns 0 * Test fractional(fixed1()) returns 0 * Test fractional(fixed1()-1) returns 10^24-1 */ function fractional(Fraction memory x) internal pure returns (Fraction memory) { return Fraction(x.value - (x.value / FIXED1_UINT) * FIXED1_UINT); // Can't overflow } /** * @notice x+y. * @dev The maximum value that can be safely used as an addition operator is defined as * maxFixedAdd = maxUint256()-1 / 2, or * 57896044618658097711785492504343953926634992332820282019728792003956564819967. * Test add(maxFixedAdd,maxFixedAdd) equals maxFixedAdd + maxFixedAdd * Test add(maxFixedAdd+1,maxFixedAdd+1) throws */ function add(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { uint256 z = x.value + y.value; require(z >= x.value, "add overflow detected"); return Fraction(z); } /** * @notice x-y. * @dev * Test subtract(6, 10) fails */ function subtract(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { require(x.value >= y.value, "substraction underflow detected"); return Fraction(x.value - y.value); } /** * @notice x*y. If any of the operators is higher than the max multiplier value it * might overflow. * @dev The maximum value that can be safely used as a multiplication operator * (maxFixedMul) is calculated as sqrt(maxUint256()*fixed1()), * or 340282366920938463463374607431768211455999999999999 * Test multiply(0,0) returns 0 * Test multiply(maxFixedMul,0) returns 0 * Test multiply(0,maxFixedMul) returns 0 * Test multiply(fixed1()/mulPrecision(),fixed1()*mulPrecision()) returns fixed1() * Test multiply(maxFixedMul,maxFixedMul) is around maxUint256() * Test multiply(maxFixedMul+1,maxFixedMul+1) fails */ function multiply(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { if (x.value == 0 || y.value == 0) return Fraction(0); if (y.value == FIXED1_UINT) return x; if (x.value == FIXED1_UINT) return y; // Separate into integer and fractional parts // x = x1 + x2, y = y1 + y2 uint256 x1 = integer(x).value / FIXED1_UINT; uint256 x2 = fractional(x).value; uint256 y1 = integer(y).value / FIXED1_UINT; uint256 y2 = fractional(y).value; // (x1 + x2) * (y1 + y2) = (x1 * y1) + (x1 * y2) + (x2 * y1) + (x2 * y2) uint256 x1y1 = x1 * y1; if (x1 != 0) require(x1y1 / x1 == y1, "overflow x1y1 detected"); // x1y1 needs to be multiplied back by fixed1 // solium-disable-next-line mixedcase uint256 fixed_x1y1 = x1y1 * FIXED1_UINT; if (x1y1 != 0) require(fixed_x1y1 / x1y1 == FIXED1_UINT, "overflow x1y1 * fixed1 detected"); x1y1 = fixed_x1y1; uint256 x2y1 = x2 * y1; if (x2 != 0) require(x2y1 / x2 == y1, "overflow x2y1 detected"); uint256 x1y2 = x1 * y2; if (x1 != 0) require(x1y2 / x1 == y2, "overflow x1y2 detected"); x2 = x2 / mulPrecision(); y2 = y2 / mulPrecision(); uint256 x2y2 = x2 * y2; if (x2 != 0) require(x2y2 / x2 == y2, "overflow x2y2 detected"); // result = fixed1() * x1 * y1 + x1 * y2 + x2 * y1 + x2 * y2 / fixed1(); Fraction memory result = Fraction(x1y1); result = add(result, Fraction(x2y1)); // Add checks for overflow result = add(result, Fraction(x1y2)); // Add checks for overflow result = add(result, Fraction(x2y2)); // Add checks for overflow return result; } /** * @notice 1/x * @dev * Test reciprocal(0) fails * Test reciprocal(fixed1()) returns fixed1() * Test reciprocal(fixed1()*fixed1()) returns 1 // Testing how the fractional is truncated * Test reciprocal(1+fixed1()*fixed1()) returns 0 // Testing how the fractional is truncated * Test reciprocal(newFixedFraction(1, 1e24)) returns newFixed(1e24) */ function reciprocal(Fraction memory x) internal pure returns (Fraction memory) { require(x.value != 0, "can't call reciprocal(0)"); return Fraction((FIXED1_UINT * FIXED1_UINT) / x.value); // Can't overflow } /** * @notice x/y. If the dividend is higher than the max dividend value, it * might overflow. You can use multiply(x,reciprocal(y)) instead. * @dev The maximum value that can be safely used as a dividend (maxNewFixed) is defined as * divide(maxNewFixed,newFixedFraction(1,fixed1())) is around maxUint256(). * This yields the value 115792089237316195423570985008687907853269984665640564. * Test maxNewFixed equals maxUint256()/fixed1() * Test divide(maxNewFixed,1) equals maxNewFixed*(fixed1) * Test divide(maxNewFixed+1,multiply(mulPrecision(),mulPrecision())) throws * Test divide(fixed1(),0) fails * Test divide(maxNewFixed,1) = maxNewFixed*(10^digits()) * Test divide(maxNewFixed+1,1) throws */ function divide(Fraction memory x, Fraction memory y) internal pure returns (Fraction memory) { require(y.value != 0, "can't divide by 0"); uint256 X = x.value * FIXED1_UINT; require(X / FIXED1_UINT == x.value, "overflow at divide"); return Fraction(X / y.value); } /** * @notice x > y */ function gt(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value > y.value; } /** * @notice x >= y */ function gte(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value >= y.value; } /** * @notice x < y */ function lt(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value < y.value; } /** * @notice x <= y */ function lte(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value <= y.value; } /** * @notice x == y */ function equals(Fraction memory x, Fraction memory y) internal pure returns (bool) { return x.value == y.value; } /** * @notice x <= 1 */ function isProperFraction(Fraction memory x) internal pure returns (bool) { return lte(x, fixed1()); } }
/Users/mchrzan/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; _; } }
/Users/mchrzan/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); } }
/Users/mchrzan/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)); } }
/Users/mchrzan/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); }
/Users/mchrzan/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); }
/Users/mchrzan/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); }
/Users/mchrzan/celo/celo-monorepo/packages/protocol/contracts/common/interfaces/IFreezer.sol
pragma solidity ^0.5.13; interface IFreezer { function isFrozen(address) external view returns (bool); }
/Users/mchrzan/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); }
/Users/mchrzan/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"); } }
/Users/mchrzan/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; }
/Users/mchrzan/celo/celo-monorepo/packages/protocol/contracts/governance/interfaces/IGovernance.sol
pragma solidity ^0.5.13; interface IGovernance { function isVoting(address) external view returns (bool); }
/Users/mchrzan/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); }
/Users/mchrzan/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; }
/Users/mchrzan/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; }
/Users/mchrzan/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); }
/Users/mchrzan/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); }
/Users/mchrzan/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; }
/Users/mchrzan/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); }
/Users/mchrzan/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/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
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Contract Creation Code
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