Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
Overview
Max Total Supply
980.08372940593886401 TCAP
Holders
308
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
2.010333817496225424 TCAPValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
TCAP
Compiler Version
v0.7.5+commit.eb77ed08
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/introspection/IERC165.sol"; import "@openzeppelin/contracts/math/SafeMath.sol"; import "./Orchestrator.sol"; /** * @title Total Market Cap Token * @author Cryptex.finance * @notice ERC20 token on the Ethereum Blockchain that provides total exposure to the cryptocurrency sector. */ contract TCAP is ERC20, Ownable, IERC165 { /// @notice Open Zeppelin libraries using SafeMath for uint256; /// @notice if enabled TCAP can't be minted if the total supply is above or equal the cap value bool public capEnabled = false; /// @notice Maximum value the total supply of TCAP uint256 public cap; /** * @notice Address to Vault Handler * @dev Only vault handlers can mint and burn TCAP */ mapping(address => bool) public vaultHandlers; /** * @dev the computed interface ID according to ERC-165. The interface ID is a XOR of interface method selectors. * mint.selector ^ * burn.selector ^ * setCap.selector ^ * enableCap.selector ^ * transfer.selector ^ * transferFrom.selector ^ * addVaultHandler.selector ^ * removeVaultHandler.selector ^ * approve.selector => 0xbd115939 */ bytes4 private constant _INTERFACE_ID_TCAP = 0xbd115939; /// @dev bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /// @notice An event emitted when a vault handler is added event VaultHandlerAdded( address indexed _owner, address indexed _tokenHandler ); /// @notice An event emitted when a vault handler is removed event VaultHandlerRemoved( address indexed _owner, address indexed _tokenHandler ); /// @notice An event emitted when the cap value is updated event NewCap(address indexed _owner, uint256 _amount); /// @notice An event emitted when the cap is enabled or disabled event NewCapEnabled(address indexed _owner, bool _enable); /** * @notice Constructor * @param _name uint256 * @param _symbol uint256 * @param _cap uint256 * @param _orchestrator address */ constructor( string memory _name, string memory _symbol, uint256 _cap, Orchestrator _orchestrator ) ERC20(_name, _symbol) { cap = _cap; /// @dev transfer ownership to orchestrator transferOwnership(address(_orchestrator)); } /// @notice Reverts if called by any account that is not a vault. modifier onlyVault() { require( vaultHandlers[msg.sender], "TCAP::onlyVault: caller is not a vault" ); _; } /** * @notice Adds a new address as a vault * @param _vaultHandler address of a contract with permissions to mint and burn tokens * @dev Only owner can call it */ function addVaultHandler(address _vaultHandler) external onlyOwner { vaultHandlers[_vaultHandler] = true; emit VaultHandlerAdded(msg.sender, _vaultHandler); } /** * @notice Removes an address as a vault * @param _vaultHandler address of the contract to be removed as vault * @dev Only owner can call it */ function removeVaultHandler(address _vaultHandler) external onlyOwner { vaultHandlers[_vaultHandler] = false; emit VaultHandlerRemoved(msg.sender, _vaultHandler); } /** * @notice Mints TCAP Tokens * @param _account address of the receiver of tokens * @param _amount uint of tokens to mint * @dev Only vault can call it */ function mint(address _account, uint256 _amount) external onlyVault { _mint(_account, _amount); } /** * @notice Burns TCAP Tokens * @param _account address of the account which is burning tokens. * @param _amount uint of tokens to burn * @dev Only vault can call it */ function burn(address _account, uint256 _amount) external onlyVault { _burn(_account, _amount); } /** * @notice Sets maximum value the total supply of TCAP can have * @param _cap value * @dev When capEnabled is true, mint is not allowed to issue tokens that would increase the total supply above or equal the specified capacity. * @dev Only owner can call it */ function setCap(uint256 _cap) external onlyOwner { cap = _cap; emit NewCap(msg.sender, _cap); } /** * @notice Enables or Disables the Total Supply Cap. * @param _enable value * @dev When capEnabled is true, minting will not be allowed above the max capacity. It can exist a supply above the cap, but it prevents minting above the cap. * @dev Only owner can call it */ function enableCap(bool _enable) external onlyOwner { capEnabled = _enable; emit NewCapEnabled(msg.sender, _enable); } /** * @notice ERC165 Standard for support of interfaces * @param _interfaceId bytes of interface * @return bool */ function supportsInterface(bytes4 _interfaceId) external pure override returns (bool) { return (_interfaceId == _INTERFACE_ID_TCAP || _interfaceId == _INTERFACE_ID_ERC165); } /** * @notice executes before each token transfer or mint * @param _from address * @param _to address * @param _amount value to transfer * @dev See {ERC20-_beforeTokenTransfer}. * @dev minted tokens must not cause the total supply to go over the cap. * @dev Reverts if the to address is equal to token address */ function _beforeTokenTransfer( address _from, address _to, uint256 _amount ) internal virtual override { super._beforeTokenTransfer(_from, _to, _amount); require( _to != address(this), "TCAP::transfer: can't transfer to TCAP contract" ); if (_from == address(0) && capEnabled) { // When minting tokens require( totalSupply().add(_amount) <= cap, "TCAP::Transfer: TCAP cap exceeded" ); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0; interface AggregatorV3Interface { function decimals() external view returns (uint8); function description() external view returns (string memory); function version() external view returns (uint256); // getRoundData and latestRoundData should both raise "No data present" // if they do not have data to report, instead of returning unset values // which could be misinterpreted as actual reported values. function getRoundData(uint80 _roundId) external view returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ); function latestRoundData() external view returns ( uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound ); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address payable) { return msg.sender; } function _msgData() internal view virtual returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../utils/EnumerableSet.sol"; import "../utils/Address.sol"; import "../GSN/Context.sol"; /** * @dev Contract module that allows children to implement role-based access * control mechanisms. * * 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 { using EnumerableSet for EnumerableSet.AddressSet; using Address for address; struct RoleData { EnumerableSet.AddressSet 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 Returns `true` if `account` has been granted `role`. */ function hasRole(bytes32 role, address account) public view returns (bool) { return _roles[role].members.contains(account); } /** * @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 returns (uint256) { return _roles[role].members.length(); } /** * @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 returns (address) { return _roles[role].members.at(index); } /** * @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 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 { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); _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 { require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); _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 { 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, _roles[role].adminRole, adminRole); _roles[role].adminRole = adminRole; } function _grantRole(bytes32 role, address account) private { if (_roles[role].members.add(account)) { emit RoleGranted(role, account, _msgSender()); } } function _revokeRole(bytes32 role, address account) private { if (_roles[role].members.remove(account)) { emit RoleRevoked(role, account, _msgSender()); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../GSN/Context.sol"; /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * 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 () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(_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; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @dev Library used to query support of an interface declared via {IERC165}. * * Note that these functions return the actual result of the query: they do not * `revert` if an interface is not supported. It is up to the caller to decide * what to do in these cases. */ library ERC165Checker { // As per the EIP-165 spec, no interface should ever match 0xffffffff bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff; /* * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 */ bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * @dev Returns true if `account` supports the {IERC165} interface, */ function supportsERC165(address account) internal view returns (bool) { // Any contract that implements ERC165 must explicitly indicate support of // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid return _supportsERC165Interface(account, _INTERFACE_ID_ERC165) && !_supportsERC165Interface(account, _INTERFACE_ID_INVALID); } /** * @dev Returns true if `account` supports the interface defined by * `interfaceId`. Support for {IERC165} itself is queried automatically. * * See {IERC165-supportsInterface}. */ function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) { // query support of both ERC165 as per the spec and support of _interfaceId return supportsERC165(account) && _supportsERC165Interface(account, interfaceId); } /** * @dev Returns true if `account` supports all the interfaces defined in * `interfaceIds`. Support for {IERC165} itself is queried automatically. * * Batch-querying can lead to gas savings by skipping repeated checks for * {IERC165} support. * * See {IERC165-supportsInterface}. */ function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) { // query support of ERC165 itself if (!supportsERC165(account)) { return false; } // query support of each interface in _interfaceIds for (uint256 i = 0; i < interfaceIds.length; i++) { if (!_supportsERC165Interface(account, interfaceIds[i])) { return false; } } // all interfaces supported return true; } /** * @notice Query if a contract implements an interface, does not check ERC165 support * @param account The address of the contract to query for support of an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @return true if the contract at account indicates support of the interface with * identifier interfaceId, false otherwise * @dev Assumes that account contains a contract that supports ERC165, otherwise * the behavior of this method is undefined. This precondition can be checked * with {supportsERC165}. * Interface identification is specified in ERC-165. */ function _supportsERC165Interface(address account, bytes4 interfaceId) private view returns (bool) { // success determines whether the staticcall succeeded and result determines // whether the contract at account indicates support of _interfaceId (bool success, bool result) = _callERC165SupportsInterface(account, interfaceId); return (success && result); } /** * @notice Calls the function with selector 0x01ffc9a7 (ERC165) and suppresses throw * @param account The address of the contract to query for support of an interface * @param interfaceId The interface identifier, as specified in ERC-165 * @return success true if the STATICCALL succeeded, false otherwise * @return result true if the STATICCALL succeeded and the contract at account * indicates support of the interface with identifier interfaceId, false otherwise */ function _callERC165SupportsInterface(address account, bytes4 interfaceId) private view returns (bool, bool) { bytes memory encodedParams = abi.encodeWithSelector(_INTERFACE_ID_ERC165, interfaceId); (bool success, bytes memory result) = account.staticcall{ gas: 30000 }(encodedParams); if (result.length < 32) return (false, false); return (success, abi.decode(result, (bool))); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../../GSN/Context.sol"; import "./IERC20.sol"; import "../../math/SafeMath.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {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 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for {name} and {symbol}, initializes {decimals} with * a default value of 18. * * To select a different value for {decimals}, use {_setupDecimals}. * * All three of these values are immutable: they can only be set once during * construction. */ constructor (string memory name_, string memory symbol_) public { _name = name_; _symbol = symbol_; _decimals = 18; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view 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 {_setupDecimals} is * called. * * 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 returns (uint8) { return _decimals; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view 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); _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); return true; } /** * @dev Moves tokens `amount` from `sender` to `recipient`. * * This is internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `sender` cannot be the zero address. * - `recipient` cannot be the zero address. * - `sender` must have a balance of at least `amount`. */ function _transfer(address sender, address recipient, uint256 amount) internal 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); _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); _balances[recipient] = _balances[recipient].add(amount); emit Transfer(sender, recipient, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `to` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); emit Transfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Transfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This 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 Sets {decimals} to a value other than the default one of 18. * * WARNING: This function should only be called from the constructor. Most * applications that interact with token contracts will not expect * {decimals} to ever change, and may work incorrectly if it does. */ function _setupDecimals(uint8 decimals_) internal { _decimals = decimals_; } /** * @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 { } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "./IERC20.sol"; import "../../math/SafeMath.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 SafeMath for uint256; 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _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"); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <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); } 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); } } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../math/SafeMath.sol"; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the {SafeMath} * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never * directly accessed. */ library Counters { using SafeMath for uint256; struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { // The {SafeMath} overflow check can be skipped here, see the comment at the top counter._value += 1; } function decrement(Counter storage counter) internal { counter._value = counter._value.sub(1); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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] = toDeleteIndex + 1; // All indexes are 1-based // 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(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(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(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(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)); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "../GSN/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 () internal { _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view 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()); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 () internal { _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; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow * checks. * * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can * easily result in undesired exploitation or bugs, since developers usually * assume that overflows raise errors. `SafeCast` restores this intuition by * reverting the transaction when such an operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. * * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing * all math on `uint256` and `int256` and then downcasting. */ library SafeCast { /** * @dev Returns the downcasted uint128 from uint256, reverting on * overflow (when the input is greater than largest uint128). * * Counterpart to Solidity's `uint128` operator. * * Requirements: * * - input must fit into 128 bits */ function toUint128(uint256 value) internal pure returns (uint128) { require(value < 2**128, "SafeCast: value doesn\'t fit in 128 bits"); return uint128(value); } /** * @dev Returns the downcasted uint64 from uint256, reverting on * overflow (when the input is greater than largest uint64). * * Counterpart to Solidity's `uint64` operator. * * Requirements: * * - input must fit into 64 bits */ function toUint64(uint256 value) internal pure returns (uint64) { require(value < 2**64, "SafeCast: value doesn\'t fit in 64 bits"); return uint64(value); } /** * @dev Returns the downcasted uint32 from uint256, reverting on * overflow (when the input is greater than largest uint32). * * Counterpart to Solidity's `uint32` operator. * * Requirements: * * - input must fit into 32 bits */ function toUint32(uint256 value) internal pure returns (uint32) { require(value < 2**32, "SafeCast: value doesn\'t fit in 32 bits"); return uint32(value); } /** * @dev Returns the downcasted uint16 from uint256, reverting on * overflow (when the input is greater than largest uint16). * * Counterpart to Solidity's `uint16` operator. * * Requirements: * * - input must fit into 16 bits */ function toUint16(uint256 value) internal pure returns (uint16) { require(value < 2**16, "SafeCast: value doesn\'t fit in 16 bits"); return uint16(value); } /** * @dev Returns the downcasted uint8 from uint256, reverting on * overflow (when the input is greater than largest uint8). * * Counterpart to Solidity's `uint8` operator. * * Requirements: * * - input must fit into 8 bits. */ function toUint8(uint256 value) internal pure returns (uint8) { require(value < 2**8, "SafeCast: value doesn\'t fit in 8 bits"); return uint8(value); } /** * @dev Converts a signed int256 into an unsigned uint256. * * Requirements: * * - input must be greater than or equal to 0. */ function toUint256(int256 value) internal pure returns (uint256) { require(value >= 0, "SafeCast: value must be positive"); return uint256(value); } /** * @dev Returns the downcasted int128 from int256, reverting on * overflow (when the input is less than smallest int128 or * greater than largest int128). * * Counterpart to Solidity's `int128` operator. * * Requirements: * * - input must fit into 128 bits * * _Available since v3.1._ */ function toInt128(int256 value) internal pure returns (int128) { require(value >= -2**127 && value < 2**127, "SafeCast: value doesn\'t fit in 128 bits"); return int128(value); } /** * @dev Returns the downcasted int64 from int256, reverting on * overflow (when the input is less than smallest int64 or * greater than largest int64). * * Counterpart to Solidity's `int64` operator. * * Requirements: * * - input must fit into 64 bits * * _Available since v3.1._ */ function toInt64(int256 value) internal pure returns (int64) { require(value >= -2**63 && value < 2**63, "SafeCast: value doesn\'t fit in 64 bits"); return int64(value); } /** * @dev Returns the downcasted int32 from int256, reverting on * overflow (when the input is less than smallest int32 or * greater than largest int32). * * Counterpart to Solidity's `int32` operator. * * Requirements: * * - input must fit into 32 bits * * _Available since v3.1._ */ function toInt32(int256 value) internal pure returns (int32) { require(value >= -2**31 && value < 2**31, "SafeCast: value doesn\'t fit in 32 bits"); return int32(value); } /** * @dev Returns the downcasted int16 from int256, reverting on * overflow (when the input is less than smallest int16 or * greater than largest int16). * * Counterpart to Solidity's `int16` operator. * * Requirements: * * - input must fit into 16 bits * * _Available since v3.1._ */ function toInt16(int256 value) internal pure returns (int16) { require(value >= -2**15 && value < 2**15, "SafeCast: value doesn\'t fit in 16 bits"); return int16(value); } /** * @dev Returns the downcasted int8 from int256, reverting on * overflow (when the input is less than smallest int8 or * greater than largest int8). * * Counterpart to Solidity's `int8` operator. * * Requirements: * * - input must fit into 8 bits. * * _Available since v3.1._ */ function toInt8(int256 value) internal pure returns (int8) { require(value >= -2**7 && value < 2**7, "SafeCast: value doesn\'t fit in 8 bits"); return int8(value); } /** * @dev Converts an unsigned uint256 into a signed int256. * * Requirements: * * - input must be less than or equal to maxInt256. */ function toInt256(uint256 value) internal pure returns (int256) { require(value < 2**255, "SafeCast: value doesn't fit in an int256"); return int256(value); } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/access/AccessControl.sol"; import "@openzeppelin/contracts/math/SafeMath.sol"; import "@openzeppelin/contracts/utils/SafeCast.sol"; import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; import "@openzeppelin/contracts/utils/ReentrancyGuard.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "@openzeppelin/contracts/utils/Pausable.sol"; import "@openzeppelin/contracts/introspection/IERC165.sol"; import "./TCAP.sol"; import "./Orchestrator.sol"; import "./oracles/ChainlinkOracle.sol"; interface IRewardHandler { function stake(address _staker, uint256 amount) external; function withdraw(address _staker, uint256 amount) external; function getRewardFromVault(address _staker) external; } /** * @title TCAP Vault Handler Abstract Contract * @author Cryptex.Finance * @notice Contract in charge of handling the TCAP Token and stake */ abstract contract IVaultHandler is Ownable, AccessControl, ReentrancyGuard, Pausable, IERC165 { /// @notice Open Zeppelin libraries using SafeMath for uint256; using SafeCast for int256; using Counters for Counters.Counter; using SafeERC20 for IERC20; /** * @notice Vault object created to manage the mint and burns of TCAP tokens * @param Id, unique identifier of the vault * @param Collateral, current collateral on vault * @param Debt, current amount of TCAP tokens minted * @param Owner, owner of the vault */ struct Vault { uint256 Id; uint256 Collateral; uint256 Debt; address Owner; } /// @notice Vault Id counter Counters.Counter public counter; /// @notice TCAP Token Address TCAP public immutable TCAPToken; /// @notice Total Market Cap/USD Oracle Address ChainlinkOracle public immutable tcapOracle; /// @notice Collateral Token Address IERC20 public immutable collateralContract; /// @notice Collateral/USD Oracle Address ChainlinkOracle public immutable collateralPriceOracle; /// @notice ETH/USD Oracle Address ChainlinkOracle public immutable ETHPriceOracle; /// @notice Value used as divisor with the total market cap, just like the S&P 500 or any major financial index would to define the final tcap token price uint256 public divisor; /// @notice Minimun ratio required to prevent liquidation of vault uint256 public ratio; /// @notice Fee percentage of the total amount to burn charged on ETH when burning TCAP Tokens uint256 public burnFee; /// @notice Penalty charged to vault owner when a vault is liquidated, this value goes to the liquidator uint256 public liquidationPenalty; /// @notice Address of the contract that gives rewards to minters of TCAP, rewards are only given if address is set in constructor IRewardHandler public immutable rewardHandler; /// @notice Address of the treasury contract (usually the timelock) where the funds generated by the protocol are sent address public treasury; /// @notice Owner address to Vault Id mapping(address => uint256) public userToVault; /// @notice Id To Vault mapping(uint256 => Vault) public vaults; /// @notice value used to multiply chainlink oracle for handling decimals uint256 public constant oracleDigits = 10000000000; /// @notice Minimum value that the ratio can be set to uint256 public constant MIN_RATIO = 150; /// @notice Maximum value that the burn fee can be set to uint256 public constant MAX_FEE = 10; /** * @dev the computed interface ID according to ERC-165. The interface ID is a XOR of interface method selectors. * setRatio.selector ^ * setBurnFee.selector ^ * setLiquidationPenalty.selector ^ * pause.selector ^ * unpause.selector => 0x9e75ab0c */ bytes4 private constant _INTERFACE_ID_IVAULT = 0x9e75ab0c; /** * @dev the computed interface ID according to ERC-165. The interface ID is a XOR of interface method selectors. * queueTransaction.selector ^ * cancelTransaction.selector ^ * executeTransaction.selector => 0x6b5cc770 */ bytes4 private constant _INTERFACE_ID_TIMELOCK = 0x6b5cc770; /// @dev bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /// @notice An event emitted when the ratio is updated event NewRatio(address indexed _owner, uint256 _ratio); /// @notice An event emitted when the burn fee is updated event NewBurnFee(address indexed _owner, uint256 _burnFee); /// @notice An event emitted when the liquidation penalty is updated event NewLiquidationPenalty( address indexed _owner, uint256 _liquidationPenalty ); /// @notice An event emitted when the treasury contract is updated event NewTreasury(address indexed _owner, address _tresury); /// @notice An event emitted when a vault is created event VaultCreated(address indexed _owner, uint256 indexed _id); /// @notice An event emitted when collateral is added to a vault event CollateralAdded( address indexed _owner, uint256 indexed _id, uint256 _amount ); /// @notice An event emitted when collateral is removed from a vault event CollateralRemoved( address indexed _owner, uint256 indexed _id, uint256 _amount ); /// @notice An event emitted when tokens are minted event TokensMinted( address indexed _owner, uint256 indexed _id, uint256 _amount ); /// @notice An event emitted when tokens are burned event TokensBurned( address indexed _owner, uint256 indexed _id, uint256 _amount ); /// @notice An event emitted when a vault is liquidated event VaultLiquidated( uint256 indexed _vaultId, address indexed _liquidator, uint256 _liquidationCollateral, uint256 _reward ); /// @notice An event emitted when a erc20 token is recovered event Recovered(address _token, uint256 _amount); /** * @notice Constructor * @param _orchestrator address * @param _divisor uint256 * @param _ratio uint256 * @param _burnFee uint256 * @param _liquidationPenalty uint256 * @param _tcapOracle address * @param _tcapAddress address * @param _collateralAddress address * @param _collateralOracle address * @param _ethOracle address * @param _rewardHandler address * @param _treasury address */ constructor( Orchestrator _orchestrator, uint256 _divisor, uint256 _ratio, uint256 _burnFee, uint256 _liquidationPenalty, address _tcapOracle, TCAP _tcapAddress, address _collateralAddress, address _collateralOracle, address _ethOracle, address _rewardHandler, address _treasury ) { require( _liquidationPenalty.add(100) < _ratio, "VaultHandler::constructor: liquidation penalty too high" ); require( _ratio >= MIN_RATIO, "VaultHandler::constructor: ratio lower than MIN_RATIO" ); require( _burnFee <= MAX_FEE, "VaultHandler::constructor: burn fee higher than MAX_FEE" ); require( ERC165Checker.supportsInterface(_treasury, _INTERFACE_ID_TIMELOCK), "VaultHandler::constructor: not a valid treasury" ); divisor = _divisor; ratio = _ratio; burnFee = _burnFee; liquidationPenalty = _liquidationPenalty; tcapOracle = ChainlinkOracle(_tcapOracle); collateralContract = IERC20(_collateralAddress); collateralPriceOracle = ChainlinkOracle(_collateralOracle); ETHPriceOracle = ChainlinkOracle(_ethOracle); TCAPToken = _tcapAddress; rewardHandler = IRewardHandler(_rewardHandler); treasury = _treasury; /// @dev counter starts in 1 as 0 is reserved for empty objects counter.increment(); /// @dev transfer ownership to orchestrator _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); transferOwnership(address(_orchestrator)); } /// @notice Reverts if the user hasn't created a vault. modifier vaultExists() { require( userToVault[msg.sender] != 0, "VaultHandler::vaultExists: no vault created" ); _; } /// @notice Reverts if value is 0. modifier notZero(uint256 _value) { require(_value != 0, "VaultHandler::notZero: value can't be 0"); _; } /** * @notice Sets the collateral ratio needed to mint tokens * @param _ratio uint * @dev Only owner can call it */ function setRatio(uint256 _ratio) external virtual onlyOwner { require( _ratio >= MIN_RATIO, "VaultHandler::setRatio: ratio lower than MIN_RATIO" ); ratio = _ratio; emit NewRatio(msg.sender, _ratio); } /** * @notice Sets the burn fee percentage an user pays when burning tcap tokens * @param _burnFee uint * @dev Only owner can call it */ function setBurnFee(uint256 _burnFee) external virtual onlyOwner { require( _burnFee <= MAX_FEE, "VaultHandler::setBurnFee: burn fee higher than MAX_FEE" ); burnFee = _burnFee; emit NewBurnFee(msg.sender, _burnFee); } /** * @notice Sets the liquidation penalty % charged on liquidation * @param _liquidationPenalty uint * @dev Only owner can call it * @dev recommended value is between 1-15% and can't be above 100% */ function setLiquidationPenalty(uint256 _liquidationPenalty) external virtual onlyOwner { require( _liquidationPenalty.add(100) < ratio, "VaultHandler::setLiquidationPenalty: liquidation penalty too high" ); liquidationPenalty = _liquidationPenalty; emit NewLiquidationPenalty(msg.sender, _liquidationPenalty); } /** * @notice Sets the treasury contract address where fees are transfered to * @param _treasury address * @dev Only owner can call it */ function setTreasury(address _treasury) external virtual onlyOwner { require( ERC165Checker.supportsInterface(_treasury, _INTERFACE_ID_TIMELOCK), "VaultHandler::setTreasury: not a valid treasury" ); treasury = (_treasury); emit NewTreasury(msg.sender, _treasury); } /** * @notice Allows an user to create an unique Vault * @dev Only one vault per address can be created */ function createVault() external virtual whenNotPaused { require( userToVault[msg.sender] == 0, "VaultHandler::createVault: vault already created" ); uint256 id = counter.current(); userToVault[msg.sender] = id; Vault memory vault = Vault(id, 0, 0, msg.sender); vaults[id] = vault; counter.increment(); emit VaultCreated(msg.sender, id); } /** * @notice Allows users to add collateral to their vaults * @param _amount of collateral to be added * @dev _amount should be higher than 0 * @dev ERC20 token must be approved first */ function addCollateral(uint256 _amount) external virtual nonReentrant vaultExists whenNotPaused notZero(_amount) { require( collateralContract.transferFrom(msg.sender, address(this), _amount), "VaultHandler::addCollateral: ERC20 transfer did not succeed" ); Vault storage vault = vaults[userToVault[msg.sender]]; vault.Collateral = vault.Collateral.add(_amount); emit CollateralAdded(msg.sender, vault.Id, _amount); } /** * @notice Allows users to remove collateral currently not being used to generate TCAP tokens from their vaults * @param _amount of collateral to remove * @dev reverts if the resulting ratio is less than the minimun ratio * @dev _amount should be higher than 0 * @dev transfers the collateral back to the user */ function removeCollateral(uint256 _amount) external virtual nonReentrant vaultExists whenNotPaused notZero(_amount) { Vault storage vault = vaults[userToVault[msg.sender]]; uint256 currentRatio = getVaultRatio(vault.Id); require( vault.Collateral >= _amount, "VaultHandler::removeCollateral: retrieve amount higher than collateral" ); vault.Collateral = vault.Collateral.sub(_amount); if (currentRatio != 0) { require( getVaultRatio(vault.Id) >= ratio, "VaultHandler::removeCollateral: collateral below min required ratio" ); } require( collateralContract.transfer(msg.sender, _amount), "VaultHandler::removeCollateral: ERC20 transfer did not succeed" ); emit CollateralRemoved(msg.sender, vault.Id, _amount); } /** * @notice Uses collateral to generate debt on TCAP Tokens which are minted and assigend to caller * @param _amount of tokens to mint * @dev _amount should be higher than 0 * @dev requires to have a vault ratio above the minimum ratio * @dev if reward handler is set stake to earn rewards */ function mint(uint256 _amount) external virtual nonReentrant vaultExists whenNotPaused notZero(_amount) { Vault storage vault = vaults[userToVault[msg.sender]]; uint256 collateral = requiredCollateral(_amount); require( vault.Collateral >= collateral, "VaultHandler::mint: not enough collateral" ); vault.Debt = vault.Debt.add(_amount); require( getVaultRatio(vault.Id) >= ratio, "VaultHandler::mint: collateral below min required ratio" ); if (address(rewardHandler) != address(0)) { rewardHandler.stake(msg.sender, _amount); } TCAPToken.mint(msg.sender, _amount); emit TokensMinted(msg.sender, vault.Id, _amount); } /** * @notice Pays the debt of TCAP tokens resulting them on burn, this releases collateral up to minimun vault ratio * @param _amount of tokens to burn * @dev _amount should be higher than 0 * @dev A fee of exactly burnFee must be sent as value on ETH * @dev The fee goes to the treasury contract * @dev if reward handler is set exit rewards */ function burn(uint256 _amount) external payable virtual nonReentrant vaultExists whenNotPaused notZero(_amount) { uint256 fee = getFee(_amount); require( msg.value >= fee, "VaultHandler::burn: burn fee less than required" ); Vault memory vault = vaults[userToVault[msg.sender]]; _burn(vault.Id, _amount); if (address(rewardHandler) != address(0)) { rewardHandler.withdraw(msg.sender, _amount); rewardHandler.getRewardFromVault(msg.sender); } safeTransferETH(treasury, fee); //send back ETH above fee safeTransferETH(msg.sender, msg.value.sub(fee)); emit TokensBurned(msg.sender, vault.Id, _amount); } /** * @notice Allow users to burn TCAP tokens to liquidate vaults with vault collateral ratio under the minium ratio, the liquidator receives the staked collateral of the liquidated vault at a premium * @param _vaultId to liquidate * @param _maxTCAP max amount of TCAP the liquidator is willing to pay to liquidate vault * @dev Resulting ratio must be above or equal minimun ratio * @dev A fee of exactly burnFee must be sent as value on ETH * @dev The fee goes to the treasury contract */ function liquidateVault(uint256 _vaultId, uint256 _maxTCAP) external payable nonReentrant whenNotPaused { Vault storage vault = vaults[_vaultId]; require(vault.Id != 0, "VaultHandler::liquidateVault: no vault created"); uint256 vaultRatio = getVaultRatio(vault.Id); require( vaultRatio < ratio, "VaultHandler::liquidateVault: vault is not liquidable" ); uint256 requiredTCAP = requiredLiquidationTCAP(vault.Id); require( _maxTCAP >= requiredTCAP, "VaultHandler::liquidateVault: liquidation amount different than required" ); uint256 fee = getFee(requiredTCAP); require( msg.value >= fee, "VaultHandler::liquidateVault: burn fee less than required" ); uint256 reward = liquidationReward(vault.Id); _burn(vault.Id, requiredTCAP); //Removes the collateral that is rewarded to liquidator vault.Collateral = vault.Collateral.sub(reward); // Triggers update of CTX Rewards if (address(rewardHandler) != address(0)) { rewardHandler.withdraw(vault.Owner, requiredTCAP); } require( collateralContract.transfer(msg.sender, reward), "VaultHandler::liquidateVault: ERC20 transfer did not succeed" ); safeTransferETH(treasury, fee); //send back ETH above fee safeTransferETH(msg.sender, msg.value.sub(fee)); emit VaultLiquidated(vault.Id, msg.sender, requiredTCAP, reward); } /** * @notice Allows the owner to Pause the Contract */ function pause() external onlyOwner { _pause(); } /** * @notice Allows the owner to Unpause the Contract */ function unpause() external onlyOwner { _unpause(); } /** * @notice Added to support recovering LP Rewards from other systems such as BAL to be distributed to holders * @param _tokenAddress address * @param _tokenAmount uint * @dev Only owner can call it */ function recoverERC20(address _tokenAddress, uint256 _tokenAmount) external onlyOwner { // Cannot recover the collateral token require( _tokenAddress != address(collateralContract), "Cannot withdraw the collateral tokens" ); IERC20(_tokenAddress).safeTransfer(owner(), _tokenAmount); emit Recovered(_tokenAddress, _tokenAmount); } /** * @notice Allows the safe transfer of ETH * @param _to account to transfer ETH * @param _value amount of ETH */ function safeTransferETH(address _to, uint256 _value) internal { (bool success, ) = _to.call{value: _value}(new bytes(0)); require(success, "ETHVaultHandler::safeTransferETH: ETH transfer failed"); } /** * @notice ERC165 Standard for support of interfaces * @param _interfaceId bytes of interface * @return bool */ function supportsInterface(bytes4 _interfaceId) external pure override returns (bool) { return (_interfaceId == _INTERFACE_ID_IVAULT || _interfaceId == _INTERFACE_ID_ERC165); } /** * @notice Returns the Vault information of specified identifier * @param _id of vault * @return Id, Collateral, Owner, Debt */ function getVault(uint256 _id) external view virtual returns ( uint256, uint256, address, uint256 ) { Vault memory vault = vaults[_id]; return (vault.Id, vault.Collateral, vault.Owner, vault.Debt); } /** * @notice Returns the price of the chainlink oracle multiplied by the digits to get 18 decimals format * @param _oracle to be the price called * @return price */ function getOraclePrice(ChainlinkOracle _oracle) public view virtual returns (uint256 price) { price = _oracle.getLatestAnswer().toUint256().mul(oracleDigits); } /** * @notice Returns the price of the TCAP token * @return price of the TCAP Token * @dev TCAP token is 18 decimals * @dev oracle totalMarketPrice must be in wei format * @dev P = T / d * P = TCAP Token Price * T = Total Crypto Market Cap * d = Divisor */ function TCAPPrice() public view virtual returns (uint256 price) { uint256 totalMarketPrice = getOraclePrice(tcapOracle); price = totalMarketPrice.div(divisor); } /** * @notice Returns the minimal required collateral to mint TCAP token * @param _amount uint amount to mint * @return collateral of the TCAP Token * @dev TCAP token is 18 decimals * @dev C = ((P * A * r) / 100) / cp * C = Required Collateral * P = TCAP Token Price * A = Amount to Mint * cp = Collateral Price * r = Minimun Ratio for Liquidation * Is only divided by 100 as eth price comes in wei to cancel the additional 0s */ function requiredCollateral(uint256 _amount) public view virtual returns (uint256 collateral) { uint256 tcapPrice = TCAPPrice(); uint256 collateralPrice = getOraclePrice(collateralPriceOracle); collateral = ((tcapPrice.mul(_amount).mul(ratio)).div(100)).div( collateralPrice ); } /** * @notice Returns the minimal required TCAP to liquidate a Vault * @param _vaultId of the vault to liquidate * @return amount required of the TCAP Token * @dev LT = ((((D * r) / 100) - cTcap) * 100) / (r - (p + 100)) * cTcap = ((C * cp) / P) * LT = Required TCAP * D = Vault Debt * C = Required Collateral * P = TCAP Token Price * cp = Collateral Price * r = Min Vault Ratio * p = Liquidation Penalty */ function requiredLiquidationTCAP(uint256 _vaultId) public view virtual returns (uint256 amount) { Vault memory vault = vaults[_vaultId]; uint256 tcapPrice = TCAPPrice(); uint256 collateralPrice = getOraclePrice(collateralPriceOracle); uint256 collateralTcap = (vault.Collateral.mul(collateralPrice)).div(tcapPrice); uint256 reqDividend = (((vault.Debt.mul(ratio)).div(100)).sub(collateralTcap)).mul(100); uint256 reqDivisor = ratio.sub(liquidationPenalty.add(100)); amount = reqDividend.div(reqDivisor); } /** * @notice Returns the Reward for liquidating a vault * @param _vaultId of the vault to liquidate * @return rewardCollateral for liquidating Vault * @dev the returned value is returned as collateral currency * @dev R = (LT * (p + 100)) / 100 * R = Liquidation Reward * LT = Required Liquidation TCAP * p = liquidation penalty */ function liquidationReward(uint256 _vaultId) public view virtual returns (uint256 rewardCollateral) { uint256 req = requiredLiquidationTCAP(_vaultId); uint256 tcapPrice = TCAPPrice(); uint256 collateralPrice = getOraclePrice(collateralPriceOracle); uint256 reward = (req.mul(liquidationPenalty.add(100))); rewardCollateral = (reward.mul(tcapPrice)).div(collateralPrice.mul(100)); } /** * @notice Returns the Collateral Ratio of the Vault * @param _vaultId id of vault * @return currentRatio * @dev vr = (cp * (C * 100)) / D * P * vr = Vault Ratio * C = Vault Collateral * cp = Collateral Price * D = Vault Debt * P = TCAP Token Price */ function getVaultRatio(uint256 _vaultId) public view virtual returns (uint256 currentRatio) { Vault memory vault = vaults[_vaultId]; if (vault.Id == 0 || vault.Debt == 0) { currentRatio = 0; } else { uint256 collateralPrice = getOraclePrice(collateralPriceOracle); currentRatio = ( (collateralPrice.mul(vault.Collateral.mul(100))).div( vault.Debt.mul(TCAPPrice()) ) ); } } /** * @notice Returns the required fee of ETH to burn the TCAP tokens * @param _amount to burn * @return fee * @dev The returned value is returned in wei * @dev f = (((P * A * b)/ 100))/ EP * f = Burn Fee Value * P = TCAP Token Price * A = Amount to Burn * b = Burn Fee % * EP = ETH Price */ function getFee(uint256 _amount) public view virtual returns (uint256 fee) { uint256 ethPrice = getOraclePrice(ETHPriceOracle); fee = (TCAPPrice().mul(_amount).mul(burnFee)).div(100).div(ethPrice); } /** * @notice Burns an amount of TCAP Tokens * @param _vaultId vault id * @param _amount to burn */ function _burn(uint256 _vaultId, uint256 _amount) internal { Vault storage vault = vaults[_vaultId]; require( vault.Debt >= _amount, "VaultHandler::burn: amount greater than debt" ); vault.Debt = vault.Debt.sub(_amount); TCAPToken.burn(msg.sender, _amount); } }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/introspection/ERC165Checker.sol"; import "./IVaultHandler.sol"; import "./TCAP.sol"; import "./oracles/ChainlinkOracle.sol"; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; /** * @title TCAP Orchestrator * @author Cryptex.finance * @notice Orchestrator contract in charge of managing the settings of the vaults, rewards and TCAP token. It acts as the owner of these contracts. */ contract Orchestrator is Ownable { /// @dev Enum which saves the available functions to emergency call. enum Functions {BURNFEE, LIQUIDATION, PAUSE} /// @notice Address that can set to 0 the fees or pause the vaults in an emergency event address public guardian; /** @dev Interface constants*/ bytes4 private constant _INTERFACE_ID_IVAULT = 0x9e75ab0c; bytes4 private constant _INTERFACE_ID_TCAP = 0xbd115939; bytes4 private constant _INTERFACE_ID_CHAINLINK_ORACLE = 0x85be402b; /// @dev tracks which vault was emergency called mapping(IVaultHandler => mapping(Functions => bool)) private emergencyCalled; /// @notice An event emitted when the guardian is updated event GuardianSet(address indexed _owner, address guardian); /// @notice An event emitted when a transaction is executed event TransactionExecuted( address indexed target, uint256 value, string signature, bytes data ); /** * @notice Constructor * @param _guardian The guardian address */ constructor(address _guardian) { require( _guardian != address(0), "Orchestrator::constructor: guardian can't be zero" ); guardian = _guardian; } /// @notice Throws if called by any account other than the guardian modifier onlyGuardian() { require( msg.sender == guardian, "Orchestrator::onlyGuardian: caller is not the guardian" ); _; } /** * @notice Throws if vault is not valid. * @param _vault address */ modifier validVault(IVaultHandler _vault) { require( ERC165Checker.supportsInterface(address(_vault), _INTERFACE_ID_IVAULT), "Orchestrator::validVault: not a valid vault" ); _; } /** * @notice Throws if TCAP Token is not valid * @param _tcap address */ modifier validTCAP(TCAP _tcap) { require( ERC165Checker.supportsInterface(address(_tcap), _INTERFACE_ID_TCAP), "Orchestrator::validTCAP: not a valid TCAP ERC20" ); _; } /** * @notice Throws if Chainlink Oracle is not valid * @param _oracle address */ modifier validChainlinkOracle(address _oracle) { require( ERC165Checker.supportsInterface( address(_oracle), _INTERFACE_ID_CHAINLINK_ORACLE ), "Orchestrator::validChainlinkOrchestrator: not a valid Chainlink Oracle" ); _; } /** * @notice Sets the guardian of the orchestrator * @param _guardian address of the guardian * @dev Only owner can call it */ function setGuardian(address _guardian) external onlyOwner { require( _guardian != address(0), "Orchestrator::setGuardian: guardian can't be zero" ); guardian = _guardian; emit GuardianSet(msg.sender, _guardian); } /** * @notice Sets the ratio of a vault * @param _vault address * @param _ratio value * @dev Only owner can call it */ function setRatio(IVaultHandler _vault, uint256 _ratio) external onlyOwner validVault(_vault) { _vault.setRatio(_ratio); } /** * @notice Sets the burn fee of a vault * @param _vault address * @param _burnFee value * @dev Only owner can call it */ function setBurnFee(IVaultHandler _vault, uint256 _burnFee) external onlyOwner validVault(_vault) { _vault.setBurnFee(_burnFee); } /** * @notice Sets the burn fee to 0, only used on a black swan event * @param _vault address * @dev Only guardian can call it * @dev Validates if _vault is valid */ function setEmergencyBurnFee(IVaultHandler _vault) external onlyGuardian validVault(_vault) { require( emergencyCalled[_vault][Functions.BURNFEE] != true, "Orchestrator::setEmergencyBurnFee: emergency call already used" ); emergencyCalled[_vault][Functions.BURNFEE] = true; _vault.setBurnFee(0); } /** * @notice Sets the liquidation penalty of a vault * @param _vault address * @param _liquidationPenalty value * @dev Only owner can call it */ function setLiquidationPenalty( IVaultHandler _vault, uint256 _liquidationPenalty ) external onlyOwner validVault(_vault) { _vault.setLiquidationPenalty(_liquidationPenalty); } /** * @notice Sets the liquidation penalty of a vault to 0, only used on a black swan event * @param _vault address * @dev Only guardian can call it * @dev Validates if _vault is valid */ function setEmergencyLiquidationPenalty(IVaultHandler _vault) external onlyGuardian validVault(_vault) { require( emergencyCalled[_vault][Functions.LIQUIDATION] != true, "Orchestrator::setEmergencyLiquidationPenalty: emergency call already used" ); emergencyCalled[_vault][Functions.LIQUIDATION] = true; _vault.setLiquidationPenalty(0); } /** * @notice Pauses the Vault * @param _vault address * @dev Only guardian can call it * @dev Validates if _vault is valid */ function pauseVault(IVaultHandler _vault) external onlyGuardian validVault(_vault) { require( emergencyCalled[_vault][Functions.PAUSE] != true, "Orchestrator::pauseVault: emergency call already used" ); emergencyCalled[_vault][Functions.PAUSE] = true; _vault.pause(); } /** * @notice Unpauses the Vault * @param _vault address * @dev Only guardian can call it * @dev Validates if _vault is valid */ function unpauseVault(IVaultHandler _vault) external onlyGuardian validVault(_vault) { _vault.unpause(); } /** * @notice Enables or disables the TCAP Cap * @param _tcap address * @param _enable bool * @dev Only owner can call it * @dev Validates if _tcap is valid */ function enableTCAPCap(TCAP _tcap, bool _enable) external onlyOwner validTCAP(_tcap) { _tcap.enableCap(_enable); } /** * @notice Sets the TCAP maximum minting value * @param _tcap address * @param _cap uint value * @dev Only owner can call it * @dev Validates if _tcap is valid */ function setTCAPCap(TCAP _tcap, uint256 _cap) external onlyOwner validTCAP(_tcap) { _tcap.setCap(_cap); } /** * @notice Adds Vault to TCAP ERC20 * @param _tcap address * @param _vault address * @dev Only owner can call it * @dev Validates if _tcap is valid * @dev Validates if _vault is valid */ function addTCAPVault(TCAP _tcap, IVaultHandler _vault) external onlyOwner validTCAP(_tcap) validVault(_vault) { _tcap.addVaultHandler(address(_vault)); } /** * @notice Removes Vault to TCAP ERC20 * @param _tcap address * @param _vault address * @dev Only owner can call it * @dev Validates if _tcap is valid * @dev Validates if _vault is valid */ function removeTCAPVault(TCAP _tcap, IVaultHandler _vault) external onlyOwner validTCAP(_tcap) validVault(_vault) { _tcap.removeVaultHandler(address(_vault)); } /** * @notice Allows the owner to execute custom transactions * @param target address * @param value uint256 * @param signature string * @param data bytes * @dev Only owner can call it */ function executeTransaction( address target, uint256 value, string memory signature, bytes memory data ) external payable onlyOwner returns (bytes memory) { bytes memory callData; if (bytes(signature).length == 0) { callData = data; } else { callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data); } require( target != address(0), "Orchestrator::executeTransaction: target can't be zero" ); // solium-disable-next-line security/no-call-value (bool success, bytes memory returnData) = target.call{value: value}(callData); require( success, "Orchestrator::executeTransaction: Transaction execution reverted." ); emit TransactionExecuted(target, value, signature, data); (target, value, signature, data); return returnData; } /** * @notice Retrieves the eth stuck on the orchestrator * @param _to address * @dev Only owner can call it */ function retrieveETH(address _to) external onlyOwner { require( _to != address(0), "Orchestrator::retrieveETH: address can't be zero" ); uint256 amount = address(this).balance; payable(_to).transfer(amount); } /// @notice Allows the contract to receive ETH receive() external payable {} }
// SPDX-License-Identifier: MIT pragma solidity 0.7.5; import "@chainlink/contracts/src/v0.6/interfaces/AggregatorV3Interface.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/introspection/IERC165.sol"; /** * @title Chainlink Oracle * @author Cryptex.finance * @notice Contract in charge or reading the information from a Chainlink Oracle. TCAP contracts read the price directly from this contract. More information can be found on Chainlink Documentation */ contract ChainlinkOracle is Ownable, IERC165 { AggregatorV3Interface internal aggregatorContract; /* * setReferenceContract.selector ^ * getLatestAnswer.selector ^ * getLatestTimestamp.selector ^ * getPreviousAnswer.selector ^ * getPreviousTimestamp.selector => 0x85be402b */ bytes4 private constant _INTERFACE_ID_CHAINLINK_ORACLE = 0x85be402b; /* * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 */ bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; /** * @notice Called once the contract is deployed. * Set the Chainlink Oracle as an aggregator. */ constructor(address _aggregator) { aggregatorContract = AggregatorV3Interface(_aggregator); } /** * @notice Changes the reference contract. * @dev Only owner can call it. */ function setReferenceContract(address _aggregator) public onlyOwner() { aggregatorContract = AggregatorV3Interface(_aggregator); } /** * @notice Returns the latest answer from the reference contract. * @return price */ function getLatestAnswer() public view returns (int256) { ( uint80 roundID, int256 price, , uint256 timeStamp, uint80 answeredInRound ) = aggregatorContract.latestRoundData(); require( timeStamp != 0, "ChainlinkOracle::getLatestAnswer: round is not complete" ); require( answeredInRound >= roundID, "ChainlinkOracle::getLatestAnswer: stale data" ); return price; } /** * @notice Returns the latest round from the reference contract. */ function getLatestRound() public view returns ( uint80, int256, uint256, uint256, uint80 ) { ( uint80 roundID, int256 price, uint256 startedAt, uint256 timeStamp, uint80 answeredInRound ) = aggregatorContract.latestRoundData(); return (roundID, price, startedAt, timeStamp, answeredInRound); } /** * @notice Returns a given round from the reference contract. * @param _id of round */ function getRound(uint80 _id) public view returns ( uint80, int256, uint256, uint256, uint80 ) { ( uint80 roundID, int256 price, uint256 startedAt, uint256 timeStamp, uint80 answeredInRound ) = aggregatorContract.getRoundData(_id); return (roundID, price, startedAt, timeStamp, answeredInRound); } /** * @notice Returns the last time the Oracle was updated. */ function getLatestTimestamp() public view returns (uint256) { (, , , uint256 timeStamp, ) = aggregatorContract.latestRoundData(); return timeStamp; } /** * @notice Returns a previous answer updated on the Oracle. * @param _id of round * @return price */ function getPreviousAnswer(uint80 _id) public view returns (int256) { (uint80 roundID, int256 price, , , ) = aggregatorContract.getRoundData(_id); require( _id <= roundID, "ChainlinkOracle::getPreviousAnswer: not enough history" ); return price; } /** * @notice Returns a previous time the Oracle was updated. * @param _id of round * @return timeStamp */ function getPreviousTimestamp(uint80 _id) public view returns (uint256) { (uint80 roundID, , , uint256 timeStamp, ) = aggregatorContract.getRoundData(_id); require( _id <= roundID, "ChainlinkOracle::getPreviousTimestamp: not enough history" ); return timeStamp; } /** * @notice ERC165 Standard for support of interfaces. */ function supportsInterface(bytes4 interfaceId) external pure override returns (bool) { return (interfaceId == _INTERFACE_ID_CHAINLINK_ORACLE || interfaceId == _INTERFACE_ID_ERC165); } }
{ "evmVersion": "istanbul", "libraries": {}, "metadata": { "bytecodeHash": "ipfs", "useLiteralContent": true }, "optimizer": { "enabled": true, "runs": 200 }, "remappings": [], "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } } }
Contract Security Audit
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"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"vaultHandlers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000373c74bce7893097ab26d22f05691907d4f2c18e000000000000000000000000000000000000000000000000000000000000000a5443415020546f6b656e0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045443415000000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): TCAP Token
Arg [1] : _symbol (string): TCAP
Arg [2] : _cap (uint256): 0
Arg [3] : _orchestrator (address): 0x373C74BcE7893097ab26d22f05691907D4f2c18e
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 000000000000000000000000373c74bce7893097ab26d22f05691907d4f2c18e
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 5443415020546f6b656e00000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5443415000000000000000000000000000000000000000000000000000000000
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