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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023.
// Sources flattened with hardhat v2.12.0 https://hardhat.org
// File @openzeppelin/contracts/access/[email protected]
// OpenZeppelin Contracts v4.4.1 (access/IAccessControl.sol)
pragma solidity ^0.8.0;
/**
* @dev External interface of AccessControl declared to support ERC165 detection.
*/
interface IAccessControl {
/**
* @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 {AccessControl-_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) external view returns (bool);
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {AccessControl-_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) external view returns (bytes32);
/**
* @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) external;
/**
* @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) external;
/**
* @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) external;
}
// File @openzeppelin/contracts/utils/[email protected]
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File @openzeppelin/contracts/utils/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
uint8 private constant _ADDRESS_LENGTH = 20;
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
/**
* @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
*/
function toHexString(address addr) internal pure returns (string memory) {
return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
}
}
// File @openzeppelin/contracts/utils/introspection/[email protected]
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File @openzeppelin/contracts/utils/introspection/[email protected]
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// File @openzeppelin/contracts/access/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (access/AccessControl.sol)
pragma solidity ^0.8.0;
/**
* @dev Contract module that allows children to implement role-based access
* control mechanisms. This is a lightweight version that doesn't allow enumerating role
* members except through off-chain means by accessing the contract event logs. Some
* applications may benefit from on-chain enumerability, for those cases see
* {AccessControlEnumerable}.
*
* Roles are referred to by their `bytes32` identifier. These should be exposed
* in the external API and be unique. The best way to achieve this is by
* using `public constant` hash digests:
*
* ```
* bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
* ```
*
* Roles can be used to represent a set of permissions. To restrict access to a
* function call, use {hasRole}:
*
* ```
* function foo() public {
* require(hasRole(MY_ROLE, msg.sender));
* ...
* }
* ```
*
* Roles can be granted and revoked dynamically via the {grantRole} and
* {revokeRole} functions. Each role has an associated admin role, and only
* accounts that have a role's admin role can call {grantRole} and {revokeRole}.
*
* By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
* that only accounts with this role will be able to grant or revoke other
* roles. More complex role relationships can be created by using
* {_setRoleAdmin}.
*
* WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
* grant and revoke this role. Extra precautions should be taken to secure
* accounts that have been granted it.
*/
abstract contract AccessControl is Context, IAccessControl, ERC165 {
struct RoleData {
mapping(address => bool) members;
bytes32 adminRole;
}
mapping(bytes32 => RoleData) private _roles;
bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
/**
* @dev Modifier that checks that an account has a specific role. Reverts
* with a standardized message including the required role.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*
* _Available since v4.1._
*/
modifier onlyRole(bytes32 role) {
_checkRole(role);
_;
}
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev Returns `true` if `account` has been granted `role`.
*/
function hasRole(bytes32 role, address account) public view virtual override returns (bool) {
return _roles[role].members[account];
}
/**
* @dev Revert with a standard message if `_msgSender()` is missing `role`.
* Overriding this function changes the behavior of the {onlyRole} modifier.
*
* Format of the revert message is described in {_checkRole}.
*
* _Available since v4.6._
*/
function _checkRole(bytes32 role) internal view virtual {
_checkRole(role, _msgSender());
}
/**
* @dev Revert with a standard message if `account` is missing `role`.
*
* The format of the revert reason is given by the following regular expression:
*
* /^AccessControl: account (0x[0-9a-f]{40}) is missing role (0x[0-9a-f]{64})$/
*/
function _checkRole(bytes32 role, address account) internal view virtual {
if (!hasRole(role, account)) {
revert(
string(
abi.encodePacked(
"AccessControl: account ",
Strings.toHexString(uint160(account), 20),
" is missing role ",
Strings.toHexString(uint256(role), 32)
)
)
);
}
}
/**
* @dev Returns the admin role that controls `role`. See {grantRole} and
* {revokeRole}.
*
* To change a role's admin, use {_setRoleAdmin}.
*/
function getRoleAdmin(bytes32 role) public view virtual override returns (bytes32) {
return _roles[role].adminRole;
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleGranted} event.
*/
function grantRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_grantRole(role, account);
}
/**
* @dev Revokes `role` from `account`.
*
* If `account` had been granted `role`, emits a {RoleRevoked} event.
*
* Requirements:
*
* - the caller must have ``role``'s admin role.
*
* May emit a {RoleRevoked} event.
*/
function revokeRole(bytes32 role, address account) public virtual override onlyRole(getRoleAdmin(role)) {
_revokeRole(role, account);
}
/**
* @dev Revokes `role` from the calling account.
*
* Roles are often managed via {grantRole} and {revokeRole}: this function's
* purpose is to provide a mechanism for accounts to lose their privileges
* if they are compromised (such as when a trusted device is misplaced).
*
* If the calling account had been revoked `role`, emits a {RoleRevoked}
* event.
*
* Requirements:
*
* - the caller must be `account`.
*
* May emit a {RoleRevoked} event.
*/
function renounceRole(bytes32 role, address account) public virtual override {
require(account == _msgSender(), "AccessControl: can only renounce roles for self");
_revokeRole(role, account);
}
/**
* @dev Grants `role` to `account`.
*
* If `account` had not been already granted `role`, emits a {RoleGranted}
* event. Note that unlike {grantRole}, this function doesn't perform any
* checks on the calling account.
*
* May emit a {RoleGranted} event.
*
* [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}.
* ====
*
* NOTE: This function is deprecated in favor of {_grantRole}.
*/
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 {
bytes32 previousAdminRole = getRoleAdmin(role);
_roles[role].adminRole = adminRole;
emit RoleAdminChanged(role, previousAdminRole, adminRole);
}
/**
* @dev Grants `role` to `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleGranted} event.
*/
function _grantRole(bytes32 role, address account) internal virtual {
if (!hasRole(role, account)) {
_roles[role].members[account] = true;
emit RoleGranted(role, account, _msgSender());
}
}
/**
* @dev Revokes `role` from `account`.
*
* Internal function without access restriction.
*
* May emit a {RoleRevoked} event.
*/
function _revokeRole(bytes32 role, address account) internal virtual {
if (hasRole(role, account)) {
_roles[role].members[account] = false;
emit RoleRevoked(role, account, _msgSender());
}
}
}
// File @openzeppelin/contracts/utils/math/[email protected]
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the subtraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// File @openzeppelin/contracts/token/ERC20/[email protected]
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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);
/**
* @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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from,
address to,
uint256 amount
) external returns (bool);
}
// File @openzeppelin/contracts/utils/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)
pragma solidity ^0.8.1;
/**
* @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
* ====
*
* [IMPORTANT]
* ====
* You shouldn't rely on `isContract` to protect against flash loan attacks!
*
* Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
* like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
* constructor.
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize/address.code.length, which returns 0
// for contracts in construction, since the code is only stored at the end
// of the constructor execution.
return account.code.length > 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");
(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");
(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");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal 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
/// @solidity memory-safe-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File @openzeppelin/contracts/token/ERC20/extensions/[email protected]
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/draft-IERC20Permit.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
* https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
*
* Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
* presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
* need to send a transaction, and thus is not required to hold Ether at all.
*/
interface IERC20Permit {
/**
* @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
* given ``owner``'s signed approval.
*
* IMPORTANT: The same issues {IERC20-approve} has related to transaction
* ordering also apply here.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `deadline` must be a timestamp in the future.
* - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
* over the EIP712-formatted function arguments.
* - the signature must use ``owner``'s current nonce (see {nonces}).
*
* For more information on the signature format, see the
* https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
* section].
*/
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external;
/**
* @dev Returns the current nonce for `owner`. This value must be
* included whenever a signature is generated for {permit}.
*
* Every successful call to {permit} increases ``owner``'s nonce by one. This
* prevents a signature from being used multiple times.
*/
function nonces(address owner) external view returns (uint256);
/**
* @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
*/
// solhint-disable-next-line func-name-mixedcase
function DOMAIN_SEPARATOR() external view returns (bytes32);
}
// File @openzeppelin/contracts/token/ERC20/utils/[email protected]
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/utils/SafeERC20.sol)
pragma solidity ^0.8.0;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using Address for address;
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
function safeApprove(
IERC20 token,
address spender,
uint256 value
) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
require(
(value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal {
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
function safePermit(
IERC20Permit token,
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) internal {
uint256 nonceBefore = token.nonces(owner);
token.permit(owner, spender, value, deadline, v, r, s);
uint256 nonceAfter = token.nonces(owner);
require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
}
/**
* @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
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File contracts/YandaMultitokenProtocolV1.sol
// SPDX-License-Identifier: GNU GPLv3
pragma solidity ^0.8.3;
contract YandaMultitokenProtocolV1 is AccessControl{
using SafeMath for uint256;
using SafeERC20 for IERC20;
uint internal TIME_FRAME_SIZE;
uint internal VALIDATORS_PERC;
uint internal BROKER_PERC;
uint internal FEE_NOMINATOR;
uint internal FEE_DENOMINATOR;
uint internal _penaltyPerc;
uint internal _lockingPeriod;
uint256 internal _totalStaked;
IERC20 internal _tokenContract;
address payable internal _beneficiary;
enum State { AWAITING_COST, AWAITING_TRANSFER, AWAITING_TERMINATION, AWAITING_VALIDATION, COMPLETED }
struct Process {
State state;
uint256 cost;
uint256 costConf;
address token;
address payable deposit;
address payable depositConf;
uint256 fee;
address service;
bytes32 productId;
uint256 startBlock;
address[] validatorsList;
address firstValidator;
bool firstResult;
address secondValidator;
bool secondResult;
}
struct Service {
address[] validators;
uint validationPerc;
uint commissionPerc;
uint validatorVersion;
}
struct Stake {
uint256 amount;
uint256 unlockingBlock;
}
mapping(address => mapping(bytes32 => Process)) internal _processes;
mapping(address => bytes32) internal _depositingProducts;
mapping(address => Service) internal _services;
mapping(address => uint256) internal _stakesByValidators;
mapping(address => address[]) internal _validatorStakers;
mapping(address => mapping(address => Stake)) internal _stakes;
event Deposit(
address indexed customer,
address indexed service,
bytes32 indexed productId,
uint256 weiAmount
);
event Action(
address indexed customer,
address indexed service,
bytes32 indexed productId,
string data
);
event Terminate(
address indexed customer,
address indexed service,
bytes32 indexed productId,
address[] validatorsList
);
event Complete(
address indexed customer,
address indexed service,
bytes32 indexed productId,
bool success
);
event CostRequest(
address indexed customer,
address indexed service,
bytes32 indexed productId,
address[] validatorsList,
string data
);
event CostResponse(
address indexed customer,
address indexed service,
bytes32 indexed productId,
uint cost
);
event Staked(
address indexed staker,
address indexed validator,
uint256 amount,
uint256 unlockingBlock
);
event UnStaked(
address indexed staker,
address indexed validator,
uint256 amount
);
modifier onlyService() {
require(_services[msg.sender].validators.length > 0, "Only service can call this method");
_;
}
constructor(uint penaltyPerc, uint lockingPeriod, address token) {
_grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
_beneficiary = payable(msg.sender);
_penaltyPerc = penaltyPerc;
_lockingPeriod = lockingPeriod;
_tokenContract = IERC20(token);
VALIDATORS_PERC = 15;
BROKER_PERC = 80;
FEE_NOMINATOR = 2;
FEE_DENOMINATOR = 1000;
TIME_FRAME_SIZE = 50;
}
function _containsAddress(address[] memory array, address search) internal pure returns(bool) {
for(uint x=0; x < array.length; x++) {
if (array[x] == search) {
return true;
}
}
return false;
}
function setBeneficiary(address payable newAddr) external onlyRole(DEFAULT_ADMIN_ROLE) {
_beneficiary = newAddr;
}
function setDefaultPerc(uint vPerc, uint bPerc) external onlyRole(DEFAULT_ADMIN_ROLE) {
VALIDATORS_PERC = vPerc;
BROKER_PERC = bPerc;
}
function setProtocolFee(uint nominator, uint denominator) external onlyRole(DEFAULT_ADMIN_ROLE) {
FEE_NOMINATOR = nominator;
FEE_DENOMINATOR = denominator;
}
function setValidationTimeFrame(uint blocks) external onlyRole(DEFAULT_ADMIN_ROLE) {
TIME_FRAME_SIZE = blocks;
}
function getValidationTimeFrame() external view returns(uint) {
return TIME_FRAME_SIZE;
}
function getStakingTokenAddr() external view returns(address) {
return address(_tokenContract);
}
receive() external payable {
address sender = _msgSender();
Process storage process = _processes[sender][_depositingProducts[sender]];
require(process.state == State.AWAITING_TRANSFER, "You don't have a deposit awaiting process, please create it first");
require(process.cost == msg.value, "Deposit amount doesn't match with the requested deposit");
// Transfer main payment from customer to the broker(subtracting the fee)
process.deposit.transfer(msg.value.sub(process.fee));
// Update process state and emit an event
process.state = State.AWAITING_TERMINATION;
emit Deposit(sender, process.service, process.productId, msg.value);
}
function addService(address service, address[] memory vList) external onlyRole(DEFAULT_ADMIN_ROLE) {
require(vList.length > 2, "Validators minimum quantity is 3");
_services[service] = Service({validators: vList, validationPerc: VALIDATORS_PERC, commissionPerc: BROKER_PERC, validatorVersion: 1});
}
function setServicePerc(address service, uint vPerc, uint bPerc) external onlyRole(DEFAULT_ADMIN_ROLE) {
Service storage instance = _services[service];
instance.validationPerc = vPerc;
instance.commissionPerc = bPerc;
}
function setValidators(address[] memory vList) external onlyService {
_services[msg.sender].validators = vList;
}
function getValidatorVer(address service) external view returns(uint) {
return _services[service].validatorVersion;
}
function setValidatorVer(uint vVer) external onlyService {
_services[msg.sender].validatorVersion = vVer;
}
function getPenaltyPerc() external view returns(uint) {
return _penaltyPerc;
}
function setPenaltyPerc(uint newPenaltyPerc) external onlyRole(DEFAULT_ADMIN_ROLE) {
_penaltyPerc = newPenaltyPerc;
}
function getLockingPeriod() external view returns(uint256) {
return _lockingPeriod;
}
function setLockingPeriod(uint256 newLockingPeriod) external onlyRole(DEFAULT_ADMIN_ROLE) {
_lockingPeriod = newLockingPeriod;
}
function inTimeFrame(address[] memory list, address search, uint256 startBlock, uint intSize) internal view returns(bool) {
for(uint x=0; x < list.length; x++) {
if(list[x] == search) {
return (
(x * intSize) <= (block.number - startBlock) &&
(block.number - startBlock) < (x * intSize + intSize)
);
}
}
return false;
}
function random() internal view returns(uint256) {
// Temp solution with fake random
// TODO resolve with real randomness
return uint256(keccak256(abi.encodePacked(block.difficulty, block.timestamp)));
}
function _randValidatorsList(address service, address exclude1, address exclude2) internal view returns(address[] memory) {
uint256 localTotalStaked = _totalStaked - _stakesByValidators[exclude1] - _stakesByValidators[exclude2];
uint256 index = 0;
uint resultLength = _services[service].validators.length;
if (exclude1 != address(0)) {
resultLength -= 1;
}
if (exclude2 != address(0)) {
resultLength -= 1;
}
address[] memory result = new address[](resultLength);
for(uint x=0; x < result.length; x++) {
index = random() % localTotalStaked;
for(uint y=0; y < _services[service].validators.length; y++) {
if (_services[service].validators[y] != exclude1 && _services[service].validators[y] != exclude2) {
if (_containsAddress(result, _services[service].validators[y]) == false) {
if (index <= _stakesByValidators[_services[service].validators[y]]) {
result[x] = _services[service].validators[y];
localTotalStaked -= _stakesByValidators[_services[service].validators[y]];
break;
}
index -= _stakesByValidators[_services[service].validators[y]];
}
}
}
}
return result;
}
function _createProcess(address token, address service, bytes32 productId, string calldata data) internal {
require(_services[service].validationPerc > 0, 'Requested service address not found');
require(_processes[msg.sender][productId].service == address(0), 'Process with specified productId already exist');
_processes[msg.sender][productId] = Process({
state: State.AWAITING_COST,
cost: 0,
costConf: 0,
token: token,
deposit: payable(address(0)),
depositConf: payable(address(0)),
fee: 0,
service: service,
productId: productId,
startBlock: block.number,
validatorsList: _randValidatorsList(service, address(0), address(0)),
firstValidator: address(0),
firstResult: false,
secondValidator: address(0),
secondResult: false
});
emit CostRequest(msg.sender, service, productId, _processes[msg.sender][productId].validatorsList, data);
if(_depositingProducts[msg.sender].length > 0) {
if(_processes[msg.sender][_depositingProducts[msg.sender]].state == State.AWAITING_TRANSFER) {
delete _processes[msg.sender][_depositingProducts[msg.sender]];
}
}
_depositingProducts[msg.sender] = productId;
}
function createProcess(address service, bytes32 productId, string calldata data) external {
_createProcess(address(0), service, productId, data);
}
function createProcess(address token, address service, bytes32 productId, string calldata data) external {
_createProcess(token, service, productId, data);
}
function _rewardLoop(address validator, uint256 reward, address token) internal returns(uint256) {
uint256 transfersSum = 0;
IERC20 tokenContract;
if(token != address(0)) {
tokenContract = IERC20(token);
}
for (uint256 i = 0; i < _validatorStakers[validator].length; i++) {
address staker = _validatorStakers[validator][i];
Stake storage stakeRecord = _stakes[staker][validator];
// Calc reward share according to the staked amount
uint256 transferAmount = reward.mul(stakeRecord.amount.mul(100).div(_stakesByValidators[validator])).div(100);
// Transfer reward to the staker
if(token == address(0)) {
payable(staker).transfer(transferAmount);
} else {
tokenContract.transfer(staker, transferAmount);
}
transfersSum += transferAmount;
}
return transfersSum;
}
function _bonusLoop(address validator, uint256 bonus) internal returns(uint256) {
uint256 transfersSum = 0;
for (uint256 i = 0; i < _validatorStakers[validator].length; i++) {
address staker = _validatorStakers[validator][i];
// Calc bonus share according to the staked amount
uint256 transferAmount = bonus.mul(_stakes[staker][validator].amount.mul(100).div(_stakesByValidators[validator])).div(100);
// Increase stake with bonus
_stakes[staker][validator].amount = _stakes[staker][validator].amount.add(transferAmount);
transfersSum += transferAmount;
}
return transfersSum;
}
function _rewardStakers(address firstValidator, address secondValidator, uint256 rewardAmount, address token) internal returns(uint256) {
uint256 firstReward = rewardAmount.mul(_stakesByValidators[firstValidator].mul(100).div(_stakesByValidators[firstValidator].add(_stakesByValidators[secondValidator]))).div(100);
uint256 secondReward = rewardAmount - firstReward;
uint256 firstRewardTsSum = _rewardLoop(firstValidator, firstReward, token);
uint256 secondRewardTsSum = _rewardLoop(secondValidator, secondReward, token);
return firstRewardTsSum + secondRewardTsSum;
}
function _rewardBonus(address firstValidator, address secondValidator, uint256 bonus) internal {
uint256 firstBonus = bonus.mul(_stakesByValidators[firstValidator].mul(100).div(_stakesByValidators[firstValidator].add(_stakesByValidators[secondValidator]))).div(100);
uint256 secondBonus = bonus - firstBonus;
uint256 firstBonusTsSum = _bonusLoop(firstValidator, firstBonus);
uint256 secondBonusTsSum = _bonusLoop(secondValidator, secondBonus);
_stakesByValidators[firstValidator] += firstBonusTsSum;
_stakesByValidators[secondValidator] += secondBonusTsSum;
}
function _makePayouts(address customer, bytes32 productId, bool needRefund, uint256 bonus) internal {
Process storage process = _processes[customer][productId];
uint256 reward_amount = process.fee.mul(_services[process.service].validationPerc).div(100);
uint256 transfers_sum = _rewardStakers(process.firstValidator, process.secondValidator, reward_amount, process.token);
if(bonus > 0) {
_rewardBonus(process.firstValidator, process.secondValidator, bonus);
}
if(needRefund == false) {
uint256 commission_amount = process.fee.mul(_services[process.service].commissionPerc).div(100);
if(process.token == address(0)) {
payable(process.service).transfer(commission_amount);
_beneficiary.transfer(process.fee - transfers_sum - commission_amount);
} else {
IERC20 tokenContract = IERC20(process.token);
tokenContract.transfer(process.service, commission_amount);
tokenContract.transfer(address(_beneficiary), process.fee - transfers_sum - commission_amount);
}
} else {
if(process.token == address(0)) {
payable(customer).transfer(process.fee - transfers_sum);
} else {
IERC20 tokenContract = IERC20(process.token);
tokenContract.transfer(customer, process.fee - transfers_sum);
}
}
}
function _penalizeLoop(address validator, uint256 penalty) internal returns(uint256) {
uint256 transfersSum = 0;
for (uint256 i = 0; i < _validatorStakers[validator].length; i++) {
address staker = _validatorStakers[validator][i];
uint256 transferAmount = penalty.mul(_stakes[staker][validator].amount.mul(100).div(_stakesByValidators[validator])).div(100);
_stakes[staker][validator].amount = _stakes[staker][validator].amount - transferAmount;
transfersSum += transferAmount;
}
// Subtract penalty from the validator total stakes amount
_stakesByValidators[validator] -= transfersSum;
return transfersSum;
}
function setProcessCost(address customer, bytes32 productId, uint256 cost, address payable depositAddr) external {
require(_stakesByValidators[msg.sender] > 0, "Only validator with stakes can call this method");
Process storage process = _processes[customer][productId];
require(_containsAddress(_services[process.service].validators, msg.sender), "Your address is not whitelisted in the product service settings");
require(process.state == State.AWAITING_COST, "Cost is already set, check the state");
require(
inTimeFrame(
process.validatorsList,
msg.sender,
process.startBlock,
TIME_FRAME_SIZE
),
"Cannot accept validation, you are out of time"
);
if(process.firstValidator == address(0)) {
process.firstValidator = msg.sender;
process.cost = cost;
process.deposit = depositAddr;
process.startBlock = block.number;
process.validatorsList = _randValidatorsList(process.service, process.firstValidator, address(0));
emit CostRequest(customer, process.service, productId, process.validatorsList, '');
} else if(process.secondValidator == address(0)) {
process.secondValidator = msg.sender;
process.costConf = cost;
process.depositConf = depositAddr;
if(process.cost == process.costConf && process.deposit == process.depositConf) {
process.fee = cost.mul(FEE_NOMINATOR).div(FEE_DENOMINATOR);
process.state = State.AWAITING_TRANSFER;
emit CostResponse(customer, process.service, productId, cost);
} else {
process.startBlock = block.number;
process.validatorsList = _randValidatorsList(process.service, process.firstValidator, process.secondValidator);
emit CostRequest(customer, process.service, productId, process.validatorsList, '');
}
} else {
if(process.cost == cost && process.deposit == depositAddr) {
process.secondValidator = msg.sender;
process.costConf = cost;
process.depositConf = depositAddr;
} else {
process.firstValidator = msg.sender;
process.cost = cost;
process.deposit = depositAddr;
}
process.cost = cost;
process.fee = cost.mul(FEE_NOMINATOR).div(FEE_DENOMINATOR);
process.state = State.AWAITING_TRANSFER;
emit CostResponse(customer, process.service, productId, cost);
}
}
function declareAction(address customer, bytes32 productId, string calldata data) external onlyService {
emit Action(customer, msg.sender, productId, data);
}
function startTermination(address customer, bytes32 productId) external {
require((_services[msg.sender].validationPerc > 0) || (msg.sender == customer), "Only service or product customer can call this method");
Process storage process = _processes[customer][productId];
require(process.state == State.AWAITING_TERMINATION, "Cannot start termination, check the state");
process.state = State.AWAITING_VALIDATION;
process.startBlock = block.number;
process.validatorsList = _randValidatorsList(process.service, address(0), address(0));
process.firstValidator = address(0);
process.firstResult = false;
process.secondValidator = address(0);
process.secondResult = false;
emit Terminate(customer, msg.sender, productId, process.validatorsList);
}
function validateTermination(address customer, bytes32 productId, bool result) external {
require(_stakesByValidators[msg.sender] > 0, "Only validator with stakes can call this method");
Process storage process = _processes[customer][productId];
require(_containsAddress(_services[process.service].validators, msg.sender), "Your address is not whitelisted in the product service settings");
require(process.state == State.AWAITING_VALIDATION, "Cannot accept validation, check the state");
require(
inTimeFrame(
process.validatorsList,
msg.sender,
process.startBlock,
TIME_FRAME_SIZE
),
"Cannot accept validation, you are out of time"
);
// If we don't have first validator response yet
if(process.firstValidator == address(0)) {
process.firstValidator = msg.sender;
process.firstResult = result;
process.startBlock = block.number;
process.validatorsList = _randValidatorsList(process.service, process.firstValidator, address(0));
emit Terminate(customer, process.service, productId, process.validatorsList);
// If we have first validator response but not the second one
} else if(process.secondValidator == address(0)) {
process.secondValidator = msg.sender;
process.secondResult = result;
// If the first and second validator results match
if(process.firstResult == process.secondResult) {
_makePayouts(customer, productId, !process.firstResult, 0);
process.state = State.COMPLETED;
emit Complete(customer, process.service, productId, process.firstResult);
// If the first and second validator results do not match
} else {
process.startBlock = block.number;
process.validatorsList = _randValidatorsList(process.service, process.firstValidator, process.secondValidator);
emit Terminate(customer, process.service, productId, process.validatorsList);
}
// If we have received the third validator response
} else {
if(process.firstResult == result) {
uint256 penalty = _stakesByValidators[process.secondValidator].mul(_penaltyPerc).div(100);
uint256 appliedPenalty = _penalizeLoop(process.secondValidator, penalty);
process.secondValidator = msg.sender;
process.secondResult = result;
_makePayouts(customer, productId, !process.firstResult, appliedPenalty);
} else {
uint256 penalty = _stakesByValidators[process.firstValidator].mul(_penaltyPerc).div(100);
uint256 appliedPenalty = _penalizeLoop(process.firstValidator, penalty);
process.firstValidator = msg.sender;
process.firstResult = result;
_makePayouts(customer, productId, !process.firstResult, appliedPenalty);
}
process.state = State.COMPLETED;
emit Complete(customer, process.service, productId, process.firstResult);
}
}
function getProcess(address customer, bytes32 productId) external view returns(Process memory) {
return _processes[customer][productId];
}
function stake(address validator, uint256 amount) external {
require(validator != address(0), "Validator address cannot be 0");
require(amount > 0, "Cannot stake 0");
bool success = _tokenContract.transferFrom(msg.sender, address(this), amount);
if(success) {
_totalStaked = _totalStaked.add(amount);
bool alreadyStaked = false;
if (_stakes[msg.sender][validator].amount > 0) {
alreadyStaked = true;
}
_stakes[msg.sender][validator].amount = _stakes[msg.sender][validator].amount.add(amount);
_stakes[msg.sender][validator].unlockingBlock = block.number + _lockingPeriod;
_stakesByValidators[validator] = _stakesByValidators[validator].add(amount);
if (alreadyStaked == false && _containsAddress(_validatorStakers[validator], msg.sender) == false) {
_validatorStakers[validator].push(msg.sender);
}
emit Staked(msg.sender, validator, amount, _stakes[msg.sender][validator].unlockingBlock);
} else {
revert("Wasn't able to transfer your token");
}
}
function unStake(address validator, uint256 amount) external {
require(amount > 0, "Cannot unstake 0");
require(_stakes[msg.sender][validator].amount >= amount, "Your balance is lower than the amount of tokens you want to unstake");
// Check locking period
require(_stakes[msg.sender][validator].unlockingBlock <= block.number, "The locking period didn't pass, you cannot unstake");
// This will transfer the amount of token from contract to the sender balance
bool success = _tokenContract.transfer(msg.sender, amount);
if(success) {
_totalStaked -= amount;
_stakes[msg.sender][validator].amount = _stakes[msg.sender][validator].amount - amount;
_stakesByValidators[validator] = _stakesByValidators[validator] - amount;
emit UnStaked(msg.sender, validator, amount);
} else {
revert("Wasn't able to execute transfer of your tokens");
}
}
function stakeOf(address staker, address validator) external view returns (Stake memory) {
return _stakes[staker][validator];
}
function totalStakeOf(address validator) external view returns (uint256) {
return _stakesByValidators[validator];
}
function totalStaked() external view returns (uint256) {
return _totalStaked;
}
function deposit(uint256 amount) external {
Process storage process = _processes[msg.sender][_depositingProducts[msg.sender]];
require(process.token != address(0), "The current process doesn't wait for an ERC20 token deposit");
require(process.state == State.AWAITING_TRANSFER, "You don't have a deposit awaiting process, please create it first");
require(process.cost == amount, "Deposit amount doesn't match with the requested cost");
// Create ERC20 token interface
IERC20 tokenContract = IERC20(process.token);
// Transfer deposit payment from customer to the contract
tokenContract.safeTransferFrom(_msgSender(), address(this), amount);
// Transfer main payment from contract to the broker(subtracting the fee)
tokenContract.safeTransfer(address(process.deposit), amount.sub(process.fee));
// Update process state and emit an event
process.state = State.AWAITING_TERMINATION;
emit Deposit(_msgSender(), process.service, process.productId, amount);
// TODO find out is it possible to revert function call after one of the safe transfers failed?
}
} |