Address Details
contract
0x57f130e4873ac340Cee867f64e4E203070984E9F
- Contract Name
- UBIController
- Creator
- 0xc02b8b–fa8663 at 0x50bae1–05c288
- 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
- 1 Transactions
- Transfers
- 0 Transfers
- Gas Used
- 68,077
- Last Balance Update
- 5007988
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- UBIController
- Optimization enabled
- true
- Compiler version
- v0.8.4+commit.c7e474f2
- Optimization runs
- 200
- EVM Version
- istanbul
- Verified at
- 2022-06-04T05:15:29.919259Z
/home/boyd/git/keyko/celo-ubi-contract/contracts/UBIController.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/math/SafeMath.sol"; import "@openzeppelin/contracts/security/Pausable.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/token/ERC20/presets/ERC20PresetMinterPauser.sol"; import "@openzeppelin/contracts/utils/structs/EnumerableMap.sol"; import "./interface/IUBIBeneficiary.sol"; import "./interface/IUBIReconciliationAccount.sol"; import "./interface/IUBIBeneficiaryFactory.sol"; import "./interface/IVersionedContract.sol"; /** * @title Celo UBI administrative contract * * @dev Administrative and orchestrator contract for the Celo UBI program * * @author Aaron Boyd <https://github.com/aaronmboyd> */ contract UBIController is IVersionedContract, Ownable, Pausable, ReentrancyGuard { using SafeMath for uint256; using SafeERC20 for IERC20; using SafeERC20 for ERC20PresetMinterPauser; using EnumerableMap for EnumerableMap.UintToAddressMap; /** * @notice Triggered when a new user has been created * * @param _userId Hashed bytes32 of the userId * @param _ubiAddress Celo address of the UBI Beneficiary */ event NewUser(bytes32 indexed _userId, address indexed _ubiAddress); /** * @notice Triggered when the disbursement amount is changed * * @param _disbursementWei New value of wei to disburse to beneficiaries */ event DisbursementUpdated(uint256 indexed _disbursementWei); /** * @notice Triggered when the UBI Beneficiary Factory is updated * * @param _oldFactoryAddress Old factory address * @param _newFactoryAddress New factory address */ event FactoryUpdated(address indexed _oldFactoryAddress, address indexed _newFactoryAddress); IERC20 public cUSDToken; ERC20PresetMinterPauser public cUBIAuthToken; IUBIBeneficiaryFactory public ubiFactory; IUBIReconciliationAccount public reconciliationAccount; // Default disbursement amount uint256 public disbursementWei = 100 ether; // Mapping of UBI Beneficiary identifiers to their contract address EnumerableMap.UintToAddressMap private ubiBeneficiaries; /** * @notice Used to initialize a new UBIController contract * * @param _cUSDToken token used for cUSD */ constructor( address _cUSDToken, address _cUBIAuthToken, address _factory, address _custodian ) { cUSDToken = IERC20(_cUSDToken); cUBIAuthToken = ERC20PresetMinterPauser(_cUBIAuthToken); ubiFactory = IUBIBeneficiaryFactory(_factory); address tmp = ubiFactory.createProxiedUBIReconciliationAccount(_custodian); reconciliationAccount = IUBIReconciliationAccount(tmp); } /** * @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 override returns ( uint256, uint256, uint256, uint256 ) { return (1, 2, 0, 1); } /** * @notice Enforces values > 0 only */ modifier greaterThanZero(uint256 _value) { require(_value > 0, "ERR_ZERO_VALUE"); _; } /** * @notice Enforces value to not be greater than a user's available balance */ modifier balanceAvailable(bytes32 _userId, uint256 _value) { require(balanceOfUBIBeneficiary(_userId) >= _value, "ERR_NO_BALANCE"); _; } /** * @notice Enforces a _userId should not be mapped to an existing user / contract address */ modifier userNotExist(bytes32 _userId) { require(!ubiBeneficiaries.contains(uint256(_userId)), "ERR_USER_EXISTS"); _; } /** * @notice Set amount of wei to disburse to new beneficiaries * * @param _newDisbursementWei disbursement amount in wei */ function setDisbursementWei(uint256 _newDisbursementWei) external onlyOwner { disbursementWei = _newDisbursementWei; emit DisbursementUpdated(disbursementWei); } /** * @notice Public update to a new UBI Beneficiary Factory * * @param _newFactoryAddress new factory address */ function setUBIBeneficiaryFactory(address _newFactoryAddress) external onlyOwner { _setUBIBeneficiaryFactory(_newFactoryAddress); } /** * @notice Internal implementation of update to a new UBI Beneficiary Factory * * @param _newFactoryAddress new factory address */ function _setUBIBeneficiaryFactory(address _newFactoryAddress) private { ubiFactory = IUBIBeneficiaryFactory(_newFactoryAddress); emit FactoryUpdated(address(ubiFactory), _newFactoryAddress); } /** * @notice Update the custodian address * * @param _custodian new custodian address */ function setCustodian(address _custodian) external onlyOwner { reconciliationAccount.setCustodian(_custodian); } /** * @notice Retrieves the available balance of a UBI beneficiary * * @param _userId user identifier * @return uint256 available balance */ function balanceOfUBIBeneficiary(bytes32 _userId) public view returns (uint256) { address ubiBeneficiaryAddress = ubiBeneficiaries.get(uint256(_userId)); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); return user.availableBalance(); } /** * @notice Retrieves the authorized balance of a UBI beneficiary * * @param _userId user identifier * @return uint256 authorized balance */ function authBalanceOfUBIBeneficiary(bytes32 _userId) public view returns (uint256) { address ubiBeneficiaryAddress = ubiBeneficiaries.get(uint256(_userId)); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); return user.authorizationBalance(); } /** * @notice Authorizes an amount for a UBI beneficiary * * @param _userId User identifier * @param _txId Raw transaction ID for this event * @param _value Amount to authorize */ function authorize( bytes32 _userId, string calldata _txId, uint256 _value ) external greaterThanZero(_value) balanceAvailable(_userId, _value) onlyOwner nonReentrant whenNotPaused { address ubiBeneficiaryAddress = ubiBeneficiaries.get(uint256(_userId)); cUBIAuthToken.mint(ubiBeneficiaryAddress, _value); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); user.authorize(_txId, _value); } /** * @notice Deauthorizes an amount for a UBI beneficiary * * @param _userId User identifier * @param _txId Raw transaction ID for this event */ function deauthorize(bytes32 _userId, string calldata _txId) external onlyOwner nonReentrant whenNotPaused { _deauthorize(uint256(_userId), _txId); } /** * @notice Deauthorizes an amount for a UBI beneficiary * @dev Implementation of external "deauthorize" function so that it may be called internally without reentrancy guard incrementing * * @param _userId User identifier * @param _txId Raw transaction ID for this event */ function _deauthorize(uint256 _userId, string calldata _txId) private { address ubiBeneficiaryAddress = ubiBeneficiaries.get(_userId); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); uint256 deauthorizedAmt = user.deauthorize(_txId); cUBIAuthToken.burn(deauthorizedAmt); } /** * @notice Settles an amount for a UBI Beneficiary and transfers to the Reconciliation account * * @param _userId User identifier * @param _txId Raw transaction ID for this event * @param _value Amount to settle */ function settle( bytes32 _userId, string calldata _txId, uint256 _value ) external greaterThanZero(_value) balanceAvailable(_userId, _value) onlyOwner nonReentrant whenNotPaused { _settle(uint256(_userId), _txId, _value); } /** * @notice Settles an amount for a UBI Beneficiary and transfers to the Reconciliation account * @dev Implementation of external "settle" function so that it may be called internally without reentrancy guard incrementing * * @param _userId User identifier * @param _txId Raw transaction ID for this event * @param _value Amount to settle */ function _settle( uint256 _userId, string calldata _txId, uint256 _value ) private { address ubiBeneficiaryAddress = ubiBeneficiaries.get(_userId); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); user.settle(_txId, _value, address(reconciliationAccount)); } /** * @notice Reconciles cUSD built up in reconciliation account and sends to pre-configured custodian * */ function reconcile() external onlyOwner nonReentrant whenNotPaused { reconciliationAccount.reconcile(); } /** * @notice create a new user and assign them a wallet contract * * @param _userId user identifier */ function newUbiBeneficiary(string calldata _userId) external onlyOwner nonReentrant whenNotPaused userNotExist(keccak256(bytes(_userId))) { address newUBIBeneficiaryAddress = ubiFactory.createProxiedUBIBeneficiary(_userId); bytes32 key = keccak256(bytes(_userId)); ubiBeneficiaries.set(uint256(key), newUBIBeneficiaryAddress); cUSDToken.transfer(newUBIBeneficiaryAddress, disbursementWei); emit NewUser(key, newUBIBeneficiaryAddress); } /** * @notice retrieve contract address for a UBI Beneficiary * * @param _userId user identifier * @return address of user's contract */ function beneficiaryAddress(bytes32 _userId) public view returns (address) { return ubiBeneficiaries.get(uint256(_userId), "ERR_USER_NOT_EXIST"); } /** * @notice Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. * * @dev In this override, we iterate all the existing UBIBeneficiary contracts * and change their owner before changing the owner of the core contract * * @param newOwner new owner of this contract * @inheritdoc Ownable * */ function transferOwnership(address newOwner) public override onlyOwner { // 1 Update owner on all UBIBeneficiary contracts uint256 i; for (i = 0; i < ubiBeneficiaries.length(); i = i.add(1)) { address ubiBeneficiaryAddress; // .at function returns a tuple of (uint256, address) (, ubiBeneficiaryAddress) = ubiBeneficiaries.at(i); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); user.transferController(newOwner); } // 2 Update reconciliation account owner, cast it as a // IUBIBeneficiary to use the transferController function IUBIBeneficiary(address(reconciliationAccount)).transferController(newOwner); // 3 Update owner of this contract super.transferOwnership(newOwner); } /** * @notice Update implementation address for beneficiaries * * @param _newLogic New implementation logic for beneficiary proxies * */ function updateBeneficiaryImplementation(address _newLogic) external onlyOwner { uint256 i; for (i = 0; i < ubiBeneficiaries.length(); i = i.add(1)) { address ubiBeneficiaryAddress; // .at function returns a tuple of (uint256, address) (, ubiBeneficiaryAddress) = ubiBeneficiaries.at(i); ubiFactory.updateProxyImplementation(ubiBeneficiaryAddress, _newLogic); } } /** * @notice Update implementation address for reconciliationAccount * * @param _newLogic New implementation logic for reconciliationAccount * */ function updateReconciliationImplementation(address _newLogic) external onlyOwner { ubiFactory.updateProxyImplementation(address(reconciliationAccount), _newLogic); } /** * @notice Update demurrage parameters. Can only be called by the current owner. * * @param _blocksInEpoch Number of blocks in an epoch for this network * @param _demurrageFreeEpochs Number of epochs which are free of demurrage * @param _demurrageNumerator Numerator for demurrage ratio * @param _demurrageDenominator Denominator for demurrage ratio * */ function setDemurrageParameters( uint256 _blocksInEpoch, uint256 _demurrageFreeEpochs, uint256 _demurrageNumerator, uint256 _demurrageDenominator ) external onlyOwner { uint256 i; for (i = 0; i < ubiBeneficiaries.length(); i = i.add(1)) { address ubiBeneficiaryAddress; // .at function returns a tuple of (uint256, address) (, ubiBeneficiaryAddress) = ubiBeneficiaries.at(i); IUBIBeneficiary user = IUBIBeneficiary(ubiBeneficiaryAddress); user.setDemurrageParameters( _blocksInEpoch, _demurrageFreeEpochs, _demurrageNumerator, _demurrageDenominator ); } } /** * @notice Triggers stopped state. * * @dev Requirements: The contract must not be paused. */ function pause() external onlyOwner nonReentrant { _pause(); } /** * @notice Returns to normal state. * * @dev Requirements: The contract must be paused. */ function unpause() external onlyOwner nonReentrant { _unpause(); } /** * @notice Emergency withdrawal of all remaining cUSD to the custodian account * * @dev The contract must be paused * @dev Sends cUSD to current custodian from the current reconciliation account */ function withdrawToCustodian() external onlyOwner whenPaused nonReentrant { uint256 balanceOf = cUSDToken.balanceOf(address(this)); address custodian = reconciliationAccount.getCustodian(); cUSDToken.transfer(custodian, balanceOf); } /** * @notice Emergency withdrawal of all remaining cUSD to the owner account * * @dev The contract must be paused * @dev Sends cUSD to current owner */ function withdrawToOwner() external onlyOwner whenPaused nonReentrant { uint256 balanceOf = cUSDToken.balanceOf(address(this)); cUSDToken.transfer(owner(), balanceOf); } /** * @notice Get beneficiary address at index * @dev Used for iterating the complete list of beneficiaries * */ function getBeneficiaryAddressAtIndex(uint256 _index) external view returns (address) { // .at function returns a tuple of (uint256, address) address ubiBeneficiaryAddress; (, ubiBeneficiaryAddress) = ubiBeneficiaries.at(_index); return ubiBeneficiaryAddress; } /** * @notice Get count of beneficiaries * */ function getBeneficiaryCount() external view returns (uint256) { return ubiBeneficiaries.length(); } }
/_openzeppelin/contracts/access/AccessControl.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; import "../utils/Strings.sol"; import "../utils/introspection/ERC165.sol"; /** * @dev External interface of AccessControl declared to support ERC165 detection. */ interface IAccessControl { function hasRole(bytes32 role, address account) external view returns (bool); function getRoleAdmin(bytes32 role) external view returns (bytes32); function grantRole(bytes32 role, address account) external; function revokeRole(bytes32 role, address account) external; function renounceRole(bytes32 role, address account) external; } /** * @dev Contract module that allows children to implement role-based access * control mechanisms. This is a lightweight version that doesn't allow enumerating role * members except through off-chain means by accessing the contract event logs. Some * applications may benefit from on-chain enumerability, for those cases see * {AccessControlEnumerable}. * * Roles are referred to by their `bytes32` identifier. These should be exposed * in the external API and be unique. The best way to achieve this is by * using `public constant` hash digests: * * ``` * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); * ``` * * Roles can be used to represent a set of permissions. To restrict access to a * function call, use {hasRole}: * * ``` * function foo() public { * require(hasRole(MY_ROLE, msg.sender)); * ... * } * ``` * * Roles can be granted and revoked dynamically via the {grantRole} and * {revokeRole} functions. Each role has an associated admin role, and only * accounts that have a role's admin role can call {grantRole} and {revokeRole}. * * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means * that only accounts with this role will be able to grant or revoke other * roles. More complex role relationships can be created by using * {_setRoleAdmin}. * * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to * grant and revoke this role. Extra precautions should be taken to secure * accounts that have been granted it. */ abstract contract AccessControl is Context, IAccessControl, ERC165 { struct RoleData { mapping (address => bool) members; bytes32 adminRole; } mapping (bytes32 => RoleData) private _roles; bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; /** * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` * * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite * {RoleAdminChanged} not being emitted signaling this. * * _Available since v3.1._ */ event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); /** * @dev Emitted when `account` is granted `role`. * * `sender` is the account that originated the contract call, an admin role * bearer except when using {_setupRole}. */ event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Emitted when `account` is revoked `role`. * * `sender` is the account that originated the contract call: * - if using `revokeRole`, it is the admin role bearer * - if using `renounceRole`, it is the role bearer (i.e. `account`) */ event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); /** * @dev Modifier that checks that an account has a specific role. Reverts * with a standardized message including the required role. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/ * * _Available since v4.1._ */ modifier onlyRole(bytes32 role) { _checkRole(role, _msgSender()); _; } /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId); } /** * @dev Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view override returns (bool) { return _roles[role].members[account]; } /** * @dev Revert with a standard message if `account` is missing `role`. * * The format of the revert reason is given by the following regular expression: * * /^AccessControl: account (0x[0-9a-f]{20}) is missing role (0x[0-9a-f]{32})$/ */ function _checkRole(bytes32 role, address account) internal view { if(!hasRole(role, account)) { revert(string(abi.encodePacked( "AccessControl: account ", Strings.toHexString(uint160(account), 20), " is missing role ", Strings.toHexString(uint256(role), 32) ))); } } /** * @dev Returns the admin role that controls `role`. See {grantRole} and * {revokeRole}. * * To change a role's admin, use {_setRoleAdmin}. */ function getRoleAdmin(bytes32 role) public view override returns (bytes32) { return _roles[role].adminRole; } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _grantRole(role, account); } /** * @dev Revokes `role` from `account`. * * If `account` had been granted `role`, emits a {RoleRevoked} event. * * Requirements: * * - the caller must have ``role``'s admin role. */ function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) { _revokeRole(role, account); } /** * @dev Revokes `role` from the calling account. * * Roles are often managed via {grantRole} and {revokeRole}: this function's * purpose is to provide a mechanism for accounts to lose their privileges * if they are compromised (such as when a trusted device is misplaced). * * If the calling account had been granted `role`, emits a {RoleRevoked} * event. * * Requirements: * * - the caller must be `account`. */ function renounceRole(bytes32 role, address account) public virtual override { require(account == _msgSender(), "AccessControl: can only renounce roles for self"); _revokeRole(role, account); } /** * @dev Grants `role` to `account`. * * If `account` had not been already granted `role`, emits a {RoleGranted} * event. Note that unlike {grantRole}, this function doesn't perform any * checks on the calling account. * * [WARNING] * ==== * This function should only be called from the constructor when setting * up the initial roles for the system. * * Using this function in any other way is effectively circumventing the admin * system imposed by {AccessControl}. * ==== */ function _setupRole(bytes32 role, address account) internal virtual { _grantRole(role, account); } /** * @dev Sets `adminRole` as ``role``'s admin role. * * Emits a {RoleAdminChanged} event. */ function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { emit RoleAdminChanged(role, getRoleAdmin(role), adminRole); _roles[role].adminRole = adminRole; } function _grantRole(bytes32 role, address account) private { if (!hasRole(role, account)) { _roles[role].members[account] = true; emit RoleGranted(role, account, _msgSender()); } } function _revokeRole(bytes32 role, address account) private { if (hasRole(role, account)) { _roles[role].members[account] = false; emit RoleRevoked(role, account, _msgSender()); } } }
/_openzeppelin/contracts/access/AccessControlEnumerable.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./AccessControl.sol"; import "../utils/structs/EnumerableSet.sol"; /** * @dev External interface of AccessControlEnumerable declared to support ERC165 detection. */ interface IAccessControlEnumerable { function getRoleMember(bytes32 role, uint256 index) external view returns (address); function getRoleMemberCount(bytes32 role) external view returns (uint256); } /** * @dev Extension of {AccessControl} that allows enumerating the members of each role. */ abstract contract AccessControlEnumerable is IAccessControlEnumerable, AccessControl { using EnumerableSet for EnumerableSet.AddressSet; mapping (bytes32 => EnumerableSet.AddressSet) private _roleMembers; /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IAccessControlEnumerable).interfaceId || super.supportsInterface(interfaceId); } /** * @dev Returns one of the accounts that have `role`. `index` must be a * value between 0 and {getRoleMemberCount}, non-inclusive. * * Role bearers are not sorted in any particular way, and their ordering may * change at any point. * * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure * you perform all queries on the same block. See the following * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] * for more information. */ function getRoleMember(bytes32 role, uint256 index) public view override returns (address) { return _roleMembers[role].at(index); } /** * @dev Returns the number of accounts that have `role`. Can be used * together with {getRoleMember} to enumerate all bearers of a role. */ function getRoleMemberCount(bytes32 role) public view override returns (uint256) { return _roleMembers[role].length(); } /** * @dev Overload {grantRole} to track enumerable memberships */ function grantRole(bytes32 role, address account) public virtual override { super.grantRole(role, account); _roleMembers[role].add(account); } /** * @dev Overload {revokeRole} to track enumerable memberships */ function revokeRole(bytes32 role, address account) public virtual override { super.revokeRole(role, account); _roleMembers[role].remove(account); } /** * @dev Overload {renounceRole} to track enumerable memberships */ function renounceRole(bytes32 role, address account) public virtual override { super.renounceRole(role, account); _roleMembers[role].remove(account); } /** * @dev Overload {_setupRole} to track enumerable memberships */ function _setupRole(bytes32 role, address account) internal virtual override { super._setupRole(role, account); _roleMembers[role].add(account); } }
/_openzeppelin/contracts/access/Ownable.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * By default, the owner account will be the one that deploys the contract. This * can later be changed with {transferOwnership}. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ abstract contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } }
/_openzeppelin/contracts/security/Pausable.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../utils/Context.sol"; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ abstract contract Pausable is Context { /** * @dev Emitted when the pause is triggered by `account`. */ event Paused(address account); /** * @dev Emitted when the pause is lifted by `account`. */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. */ constructor () { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. * * Requirements: * * - The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. * * Requirements: * * - The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; } /** * @dev Triggers stopped state. * * Requirements: * * - The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Returns to normal state. * * Requirements: * * - The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
/_openzeppelin/contracts/security/ReentrancyGuard.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor () { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
/_openzeppelin/contracts/token/ERC20/ERC20.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin guidelines: functions revert instead * of returning `false` on failure. This behavior is nonetheless conventional * and does not conflict with the expectations of ERC20 applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The defaut value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `recipient` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * Requirements: * * - `sender` and `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. * - the caller must have allowance for ``sender``'s tokens of at least * `amount`. */ function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { _transfer(sender, recipient, amount); uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); _approve(sender, _msgSender(), currentAllowance - amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); _approve(_msgSender(), spender, currentAllowance - subtractedValue); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(sender, recipient, amount); uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); _balances[sender] = senderBalance - amount; _balances[recipient] += amount; emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); _balances[account] = accountBalance - amount; _totalSupply -= amount; emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve(address owner, address spender, uint256 amount) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be to transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } }
/_openzeppelin/contracts/token/ERC20/IERC20.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
/_openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC20.sol"; import "../../../utils/Context.sol"; /** * @dev Extension of {ERC20} that allows token holders to destroy both their own * tokens and those that they have an allowance for, in a way that can be * recognized off-chain (via event analysis). */ abstract contract ERC20Burnable is Context, ERC20 { /** * @dev Destroys `amount` tokens from the caller. * * See {ERC20-_burn}. */ function burn(uint256 amount) public virtual { _burn(_msgSender(), amount); } /** * @dev Destroys `amount` tokens from `account`, deducting from the caller's * allowance. * * See {ERC20-_burn} and {ERC20-allowance}. * * Requirements: * * - the caller must have allowance for ``accounts``'s tokens of at least * `amount`. */ function burnFrom(address account, uint256 amount) public virtual { uint256 currentAllowance = allowance(account, _msgSender()); require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance"); _approve(account, _msgSender(), currentAllowance - amount); _burn(account, amount); } }
/_openzeppelin/contracts/token/ERC20/extensions/ERC20Pausable.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC20.sol"; import "../../../security/Pausable.sol"; /** * @dev ERC20 token with pausable token transfers, minting and burning. * * Useful for scenarios such as preventing trades until the end of an evaluation * period, or having an emergency switch for freezing all token transfers in the * event of a large bug. */ abstract contract ERC20Pausable is ERC20, Pausable { /** * @dev See {ERC20-_beforeTokenTransfer}. * * Requirements: * * - the contract must not be paused. */ function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override { super._beforeTokenTransfer(from, to, amount); require(!paused(), "ERC20Pausable: token transfer while paused"); } }
/_openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
/_openzeppelin/contracts/token/ERC20/presets/ERC20PresetMinterPauser.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../ERC20.sol"; import "../extensions/ERC20Burnable.sol"; import "../extensions/ERC20Pausable.sol"; import "../../../access/AccessControlEnumerable.sol"; import "../../../utils/Context.sol"; /** * @dev {ERC20} token, including: * * - ability for holders to burn (destroy) their tokens * - a minter role that allows for token minting (creation) * - a pauser role that allows to stop all token transfers * * This contract uses {AccessControl} to lock permissioned functions using the * different roles - head to its documentation for details. * * The account that deploys the contract will be granted the minter and pauser * roles, as well as the default admin role, which will let it grant both minter * and pauser roles to other accounts. */ contract ERC20PresetMinterPauser is Context, AccessControlEnumerable, ERC20Burnable, ERC20Pausable { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE"); /** * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the * account that deploys the contract. * * See {ERC20-constructor}. */ constructor(string memory name, string memory symbol) ERC20(name, symbol) { _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); _setupRole(MINTER_ROLE, _msgSender()); _setupRole(PAUSER_ROLE, _msgSender()); } /** * @dev Creates `amount` new tokens for `to`. * * See {ERC20-_mint}. * * Requirements: * * - the caller must have the `MINTER_ROLE`. */ function mint(address to, uint256 amount) public virtual { require(hasRole(MINTER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have minter role to mint"); _mint(to, amount); } /** * @dev Pauses all token transfers. * * See {ERC20Pausable} and {Pausable-_pause}. * * Requirements: * * - the caller must have the `PAUSER_ROLE`. */ function pause() public virtual { require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to pause"); _pause(); } /** * @dev Unpauses all token transfers. * * See {ERC20Pausable} and {Pausable-_unpause}. * * Requirements: * * - the caller must have the `PAUSER_ROLE`. */ function unpause() public virtual { require(hasRole(PAUSER_ROLE, _msgSender()), "ERC20PresetMinterPauser: must have pauser role to unpause"); _unpause(); } function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override(ERC20, ERC20Pausable) { super._beforeTokenTransfer(from, to, amount); } }
/_openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
/_openzeppelin/contracts/utils/Address.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call{ value: amount }(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: value }(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
/_openzeppelin/contracts/utils/Context.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
/_openzeppelin/contracts/utils/Strings.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant alphabet = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = alphabet[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
/_openzeppelin/contracts/utils/introspection/ERC165.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IERC165.sol"; /** * @dev Implementation of the {IERC165} interface. * * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check * for the additional interface id that will be supported. For example: * * ```solidity * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { * return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); * } * ``` * * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. */ abstract contract ERC165 is IERC165 { /** * @dev See {IERC165-supportsInterface}. */ function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { return interfaceId == type(IERC165).interfaceId; } }
/_openzeppelin/contracts/utils/introspection/IERC165.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * Implementers can declare support of contract interfaces, which can then be * queried by others ({ERC165Checker}). * * For an implementation, see {ERC165}. */ interface IERC165 { /** * @dev Returns true if this contract implements the interface defined by * `interfaceId`. See the corresponding * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] * to learn more about how these ids are created. * * This function call must use less than 30 000 gas. */ function supportsInterface(bytes4 interfaceId) external view returns (bool); }
/_openzeppelin/contracts/utils/math/SafeMath.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; // CAUTION // This version of SafeMath should only be used with Solidity 0.8 or later, // because it relies on the compiler's built in overflow checks. /** * @dev Wrappers over Solidity's arithmetic operations. * * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler * now has built in overflow checking. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b > a) return (false, 0); return (true, a - b); } } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a / b); } } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { unchecked { if (b == 0) return (false, 0); return (true, a % b); } } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { return a + b; } /** * @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 a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { return a * b; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b <= a, errorMessage); return a - b; } } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * 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). * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a / b; } } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { unchecked { require(b > 0, errorMessage); return a % b; } } }
/_openzeppelin/contracts/utils/structs/EnumerableMap.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./EnumerableSet.sol"; /** * @dev Library for managing an enumerable variant of Solidity's * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`] * type. * * Maps have the following properties: * * - Entries are added, removed, and checked for existence in constant time * (O(1)). * - Entries are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableMap for EnumerableMap.UintToAddressMap; * * // Declare a set state variable * EnumerableMap.UintToAddressMap private myMap; * } * ``` * * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are * supported. */ library EnumerableMap { using EnumerableSet for EnumerableSet.Bytes32Set; // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Map type with // bytes32 keys and values. // The Map implementation uses private functions, and user-facing // implementations (such as Uint256ToAddressMap) are just wrappers around // the underlying Map. // This means that we can only create new EnumerableMaps for types that fit // in bytes32. struct Map { // Storage of keys EnumerableSet.Bytes32Set _keys; mapping (bytes32 => bytes32) _values; } /** * @dev Adds a key-value pair to a map, or updates the value for an existing * key. O(1). * * Returns true if the key was added to the map, that is if it was not * already present. */ function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) { map._values[key] = value; return map._keys.add(key); } /** * @dev Removes a key-value pair from a map. O(1). * * Returns true if the key was removed from the map, that is if it was present. */ function _remove(Map storage map, bytes32 key) private returns (bool) { delete map._values[key]; return map._keys.remove(key); } /** * @dev Returns true if the key is in the map. O(1). */ function _contains(Map storage map, bytes32 key) private view returns (bool) { return map._keys.contains(key); } /** * @dev Returns the number of key-value pairs in the map. O(1). */ function _length(Map storage map) private view returns (uint256) { return map._keys.length(); } /** * @dev Returns the key-value pair stored at position `index` in the map. O(1). * * Note that there are no guarantees on the ordering of entries inside the * array, and it may change when more entries are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) { bytes32 key = map._keys.at(index); return (key, map._values[key]); } /** * @dev Tries to returns the value associated with `key`. O(1). * Does not revert if `key` is not in the map. */ function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) { bytes32 value = map._values[key]; if (value == bytes32(0)) { return (_contains(map, key), bytes32(0)); } else { return (true, value); } } /** * @dev Returns the value associated with `key`. O(1). * * Requirements: * * - `key` must be in the map. */ function _get(Map storage map, bytes32 key) private view returns (bytes32) { bytes32 value = map._values[key]; require(value != 0 || _contains(map, key), "EnumerableMap: nonexistent key"); return value; } /** * @dev Same as {_get}, with a custom error message when `key` is not in the map. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {_tryGet}. */ function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) { bytes32 value = map._values[key]; require(value != 0 || _contains(map, key), errorMessage); return value; } // UintToAddressMap struct UintToAddressMap { Map _inner; } /** * @dev Adds a key-value pair to a map, or updates the value for an existing * key. O(1). * * Returns true if the key was added to the map, that is if it was not * already present. */ function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) { return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the key was removed from the map, that is if it was present. */ function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) { return _remove(map._inner, bytes32(key)); } /** * @dev Returns true if the key is in the map. O(1). */ function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) { return _contains(map._inner, bytes32(key)); } /** * @dev Returns the number of elements in the map. O(1). */ function length(UintToAddressMap storage map) internal view returns (uint256) { return _length(map._inner); } /** * @dev Returns the element stored at position `index` in the set. O(1). * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) { (bytes32 key, bytes32 value) = _at(map._inner, index); return (uint256(key), address(uint160(uint256(value)))); } /** * @dev Tries to returns the value associated with `key`. O(1). * Does not revert if `key` is not in the map. * * _Available since v3.4._ */ function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) { (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key)); return (success, address(uint160(uint256(value)))); } /** * @dev Returns the value associated with `key`. O(1). * * Requirements: * * - `key` must be in the map. */ function get(UintToAddressMap storage map, uint256 key) internal view returns (address) { return address(uint160(uint256(_get(map._inner, bytes32(key))))); } /** * @dev Same as {get}, with a custom error message when `key` is not in the map. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryGet}. */ function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) { return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage)))); } }
/_openzeppelin/contracts/utils/structs/EnumerableSet.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Library for managing * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive * types. * * Sets have the following properties: * * - Elements are added, removed, and checked for existence in constant time * (O(1)). * - Elements are enumerated in O(n). No guarantees are made on the ordering. * * ``` * contract Example { * // Add the library methods * using EnumerableSet for EnumerableSet.AddressSet; * * // Declare a set state variable * EnumerableSet.AddressSet private mySet; * } * ``` * * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`) * and `uint256` (`UintSet`) are supported. */ library EnumerableSet { // To implement this library for multiple types with as little code // repetition as possible, we write it in terms of a generic Set type with // bytes32 values. // The Set implementation uses private functions, and user-facing // implementations (such as AddressSet) are just wrappers around the // underlying Set. // This means that we can only create new EnumerableSets for types that fit // in bytes32. struct Set { // Storage of set values bytes32[] _values; // Position of the value in the `values` array, plus 1 because index 0 // means a value is not in the set. mapping (bytes32 => uint256) _indexes; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function _add(Set storage set, bytes32 value) private returns (bool) { if (!_contains(set, value)) { set._values.push(value); // The value is stored at length-1, but we add 1 to all indexes // and use 0 as a sentinel value set._indexes[value] = set._values.length; return true; } else { return false; } } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function _remove(Set storage set, bytes32 value) private returns (bool) { // We read and store the value's index to prevent multiple reads from the same storage slot uint256 valueIndex = set._indexes[value]; if (valueIndex != 0) { // Equivalent to contains(set, value) // To delete an element from the _values array in O(1), we swap the element to delete with the last one in // the array, and then remove the last element (sometimes called as 'swap and pop'). // This modifies the order of the array, as noted in {at}. uint256 toDeleteIndex = valueIndex - 1; uint256 lastIndex = set._values.length - 1; // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. bytes32 lastvalue = set._values[lastIndex]; // Move the last value to the index where the value to delete is set._values[toDeleteIndex] = lastvalue; // Update the index for the moved value set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex // Delete the slot where the moved value was stored set._values.pop(); // Delete the index for the deleted slot delete set._indexes[value]; return true; } else { return false; } } /** * @dev Returns true if the value is in the set. O(1). */ function _contains(Set storage set, bytes32 value) private view returns (bool) { return set._indexes[value] != 0; } /** * @dev Returns the number of values on the set. O(1). */ function _length(Set storage set) private view returns (uint256) { return set._values.length; } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function _at(Set storage set, uint256 index) private view returns (bytes32) { require(set._values.length > index, "EnumerableSet: index out of bounds"); return set._values[index]; } // Bytes32Set struct Bytes32Set { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _add(set._inner, value); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) { return _remove(set._inner, value); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) { return _contains(set._inner, value); } /** * @dev Returns the number of values in the set. O(1). */ function length(Bytes32Set storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) { return _at(set._inner, index); } // AddressSet struct AddressSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(AddressSet storage set, address value) internal returns (bool) { return _add(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(AddressSet storage set, address value) internal returns (bool) { return _remove(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(AddressSet storage set, address value) internal view returns (bool) { return _contains(set._inner, bytes32(uint256(uint160(value)))); } /** * @dev Returns the number of values in the set. O(1). */ function length(AddressSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(AddressSet storage set, uint256 index) internal view returns (address) { return address(uint160(uint256(_at(set._inner, index)))); } // UintSet struct UintSet { Set _inner; } /** * @dev Add a value to a set. O(1). * * Returns true if the value was added to the set, that is if it was not * already present. */ function add(UintSet storage set, uint256 value) internal returns (bool) { return _add(set._inner, bytes32(value)); } /** * @dev Removes a value from a set. O(1). * * Returns true if the value was removed from the set, that is if it was * present. */ function remove(UintSet storage set, uint256 value) internal returns (bool) { return _remove(set._inner, bytes32(value)); } /** * @dev Returns true if the value is in the set. O(1). */ function contains(UintSet storage set, uint256 value) internal view returns (bool) { return _contains(set._inner, bytes32(value)); } /** * @dev Returns the number of values on the set. O(1). */ function length(UintSet storage set) internal view returns (uint256) { return _length(set._inner); } /** * @dev Returns the value stored at position `index` in the set. O(1). * * Note that there are no guarantees on the ordering of values inside the * array, and it may change when more values are added or removed. * * Requirements: * * - `index` must be strictly less than {length}. */ function at(UintSet storage set, uint256 index) internal view returns (uint256) { return uint256(_at(set._inner, index)); } }
/home/boyd/git/keyko/celo-ubi-contract/contracts/interface/IUBIBeneficiary.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title Celo UBI beneficiary contract interface * * @dev A simple wallet contract to hold specific ERC20 tokens that is controlled by an owner * * @author Aaron Boyd <https://github.com/aaronmboyd> */ interface IUBIBeneficiary { /** * @notice Triggered when an amount has been pre-authorized for a user * * @param _userId Hashed bytes32 of the userId converted to uint256 * @param _ubiAddress Celo address of the UBI Beneficiary * @param _txId Raw transaction ID for this event * @param _amt Amount of the transaction */ event AuthorizationEvent( bytes32 indexed _userId, address indexed _ubiAddress, string _txId, uint256 _amt ); /** * @notice Triggered when an amount has been de-authorized for a user * * @param _userId Hashed bytes32 of the userId converted to uint256 * @param _ubiAddress Celo address of the UBI Beneficiary * @param _txId Raw transaction ID for this event */ event DeauthorizationEvent( bytes32 indexed _userId, address indexed _ubiAddress, string _txId, uint256 _amt ); /** * @notice Triggered when an amount has been settled for a user * * @param _userId Hashed bytes32 of the userId converted to uint256 * @param _ubiAddress Celo address of the UBI Beneficiary * @param _txId Raw transaction ID for this event * @param _amt Amount of the transaction */ event SettlementEvent( bytes32 indexed _userId, address indexed _ubiAddress, string _txId, uint256 _amt ); /** * @notice Triggered when a demurrage charge has been paid back to the owner * * @param _userId Hashed bytes32 of the userId converted to uint256 * @param _ubiAddress Celo address of the UBI Beneficiary * @param _txId Raw transaction ID for this event * @param _amt Demurrage amount paid */ event DemurragePaidEvent( bytes32 indexed _userId, address indexed _ubiAddress, string _txId, uint256 _amt ); /** * @notice Used to initialize a new UBIBeneficiary contract * * @param _cUSDToken token used for cUSD * @param _cUBIAuthToken token used for cUSD authorizations * @param _userId userId for the UBI beneficiary * * @dev Demurrage parameters defaulted to Celo: 17280 blocks/epoch, 28 epochs demurrage free, and 1% (1/100) per epoch after */ function initialize( address _cUSDToken, address _cUBIAuthToken, address _controller, string memory _userId ) external; /** * @notice External entry point function for updating of updating demurrage parameters * * @param _blocksInEpoch Number of blocks in an epoch for this network * @param _demurrageFreeEpochs Number of epochs which are free of demurrage * @param _demurrageNumerator Numerator for demurrage ratio * @param _demurrageDenominator Denominator for demurrage ratio * */ function setDemurrageParameters( uint256 _blocksInEpoch, uint256 _demurrageFreeEpochs, uint256 _demurrageNumerator, uint256 _demurrageDenominator ) external; /** * @notice Return array of settlementKeys * * @dev Note this is marked external, you cannot return dynamically sized data target is a Web3 caller for iterating Settlements * */ function getSettlementKeys() external view returns (bytes32[] memory); /** * @notice Return array of authorizationsKeys * * @dev Note this is marked external, you cannot return dynamically sized data target is a Web3 caller for iterating Authorizations * */ function getAuthorizationKeys() external view returns (bytes32[] memory); /** * @notice Return the primitive attributes of an Authorization struct * * @param _key Map key of the Authorization to return * */ function getAuthorizationAtKey(bytes32 _key) external view returns ( uint256, bool, string memory ); /** * @notice Return the primitive attributes of an Settlement struct * * @param _key Map key of the Settlement to return * */ function getSettlementAtKey(bytes32 _key) external view returns (uint256, string memory); /** * @notice retrieve available balance for this contract * * @return uint256 usable balance for this contract */ function availableBalance() external view returns (uint256); /** * @notice retrieve authorization balance for this contract * * @return uint256 authorization balance for this contract */ function authorizationBalance() external view returns (uint256); /** * @notice External method deauthorization * * @param _txId Dynamic string txId of the transaction to de-authorize * * @dev We don't need to specify the transaction size here because it is stored in the Authorization struct * */ function deauthorize(string calldata _txId) external returns (uint256); /** * @notice Store a new authorization * @param _txId Dynamic string txId of the transaction to authorize * @param _value uint256 transaction amount * * */ function authorize(string calldata _txId, uint256 _value) external; /** * @notice Perform a settlement by returning cUSD token to the reconciliation contract * * @param _txId Dynamic string txId of the transaction to authorize * @param _value uint256 transaction amount * @param _reconciliationAccount Reconciliation account to send the cUSD to during settlement * * @dev If there was an existing authorization for this txId, de-authorize it, for the original authorization amount, regardless of the current settlement amount * */ function settle( string calldata _txId, uint256 _value, address _reconciliationAccount ) external; /** * @notice Transfer control of the UBIBeneficiary * * @param _newController New owner address * */ function transferController(address _newController) external; }
/home/boyd/git/keyko/celo-ubi-contract/contracts/interface/IUBIBeneficiaryFactory.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IUBIBeneficiaryFactory { /** * @notice Triggered when a new UBIBeneficiary has been created * * @param _newUBIBeneficiaryAddress Celo address of the UBI Beneficiary */ event UBIBeneficiaryCreated(address _newUBIBeneficiaryAddress); /** * @notice Triggered when a new UBIReconciliationAccount has been created * * @param _newUBIReconciliationAccountAddress Celo address of the UBI Reconciliation Account */ event UBIReconciliationAccountCreated(address _newUBIReconciliationAccountAddress); /** * @notice Create a new UBI Beneficiary proxy contract * * @param _userId UserId of the new beneficiary * */ function createProxiedUBIBeneficiary(string memory _userId) external returns (address); /** * @notice Create a new UBI Reconciliation proxy contract * * @param _custodian Address of the custodian target address * */ function createProxiedUBIReconciliationAccount(address _custodian) external returns (address); /** * @notice Update proxy implementation address * * @param _proxy Address of either a UBIBeneficiary or ReconciliationAccount proxy * @param _newLogic Address of new implementation contract * */ function updateProxyImplementation(address _proxy, address _newLogic) external; }
/home/boyd/git/keyko/celo-ubi-contract/contracts/interface/IUBIReconciliationAccount.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./IUBIBeneficiary.sol"; /** * @title Celo UBI reconciliation contract interface * * @dev This contract is a special version of a * UBIBeneficiary that additionally sweeps * cUSD to a known custodian address * * @author Aaron Boyd <https://github.com/aaronmboyd> */ interface IUBIReconciliationAccount is IUBIBeneficiary { /** * @notice triggered when an amount has been reconciled * * @param _custodian reconciliation target * @param _amt reconciliation amount */ event Reconciled(address _custodian, uint256 _amt); /** * @notice triggered when the custodian has been updated * * @param _custodianPrevious previous custodian * @param _custodianCurrent current custodian */ event CustodianUpdated(address _custodianPrevious, address _custodianCurrent); /** * @notice Used to initialize a new UBIReconciliationAccount contract * * @param _cUSDToken token used for cUSD * @param _cUBIAuthToken token used for cUSD authorizations * @param _custodian Address of the custodian * */ function initialize( address _cUSDToken, address _cUBIAuthToken, address _custodian, address _controller ) external; /** * @notice reconcile the cUSD balance of this account and send to the custodian * */ function reconcile() external; /** * @notice update the custodian address * * @param _custodian new custodian address */ function setCustodian(address _custodian) external; /** * @notice Get the custodian address */ function getCustodian() external view returns (address); }
/home/boyd/git/keyko/celo-ubi-contract/contracts/interface/IVersionedContract.sol
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; interface IVersionedContract { /** * @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 ); }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_cUSDToken","internalType":"address"},{"type":"address","name":"_cUBIAuthToken","internalType":"address"},{"type":"address","name":"_factory","internalType":"address"},{"type":"address","name":"_custodian","internalType":"address"}]},{"type":"event","name":"DisbursementUpdated","inputs":[{"type":"uint256","name":"_disbursementWei","internalType":"uint256","indexed":true}],"anonymous":false},{"type":"event","name":"FactoryUpdated","inputs":[{"type":"address","name":"_oldFactoryAddress","internalType":"address","indexed":true},{"type":"address","name":"_newFactoryAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"NewUser","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32","indexed":true},{"type":"address","name":"_ubiAddress","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Paused","inputs":[{"type":"address","name":"account","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"Unpaused","inputs":[{"type":"address","name":"account","internalType":"address","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"authBalanceOfUBIBeneficiary","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"authorize","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"},{"type":"string","name":"_txId","internalType":"string"},{"type":"uint256","name":"_value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOfUBIBeneficiary","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"beneficiaryAddress","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract ERC20PresetMinterPauser"}],"name":"cUBIAuthToken","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"cUSDToken","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"deauthorize","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"},{"type":"string","name":"_txId","internalType":"string"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"disbursementWei","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"getBeneficiaryAddressAtIndex","inputs":[{"type":"uint256","name":"_index","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"getBeneficiaryCount","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"uint256","name":"","internalType":"uint256"}],"name":"getVersionNumber","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"newUbiBeneficiary","inputs":[{"type":"string","name":"_userId","internalType":"string"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"pause","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"paused","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"reconcile","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IUBIReconciliationAccount"}],"name":"reconciliationAccount","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setCustodian","inputs":[{"type":"address","name":"_custodian","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setDemurrageParameters","inputs":[{"type":"uint256","name":"_blocksInEpoch","internalType":"uint256"},{"type":"uint256","name":"_demurrageFreeEpochs","internalType":"uint256"},{"type":"uint256","name":"_demurrageNumerator","internalType":"uint256"},{"type":"uint256","name":"_demurrageDenominator","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setDisbursementWei","inputs":[{"type":"uint256","name":"_newDisbursementWei","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setUBIBeneficiaryFactory","inputs":[{"type":"address","name":"_newFactoryAddress","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"settle","inputs":[{"type":"bytes32","name":"_userId","internalType":"bytes32"},{"type":"string","name":"_txId","internalType":"string"},{"type":"uint256","name":"_value","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IUBIBeneficiaryFactory"}],"name":"ubiFactory","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"unpause","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateBeneficiaryImplementation","inputs":[{"type":"address","name":"_newLogic","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"updateReconciliationImplementation","inputs":[{"type":"address","name":"_newLogic","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawToCustodian","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"withdrawToOwner","inputs":[]}]
Contract Creation Code
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