Address Details
contract
0xd0C0183682102C2a84f37e8C90063A25cCe044fF
- Contract Name
- Accounts
- Creator
- 0xe1207b–0408ee at 0xafe171–e0b1e3
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 2 Transactions
- Transfers
- 0 Transfers
- Gas Used
- 47,464
- Last Balance Update
- 13810075
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- Accounts
- Optimization enabled
- false
- Compiler version
- v0.5.13+commit.5b0b510c
- EVM Version
- istanbul
- Verified at
- 2022-03-22T11:59:11.330991Z
/home/eruiz/Projects/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/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 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;
}
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;
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);
/**
* @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, 3, 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 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;
}
}
/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);
}
/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/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/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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