Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IACLManager} from '@aave/core-v3/contracts/interfaces/IACLManager.sol';
import {IPoolAddressesProvider} from '@aave/core-v3/contracts/interfaces/IPoolAddressesProvider.sol';
import {PercentageMath} from '@aave/core-v3/contracts/protocol/libraries/math/PercentageMath.sol';
import {IERC3156FlashBorrower} from '@openzeppelin/contracts/interfaces/IERC3156FlashBorrower.sol';
import {IERC3156FlashLender} from '@openzeppelin/contracts/interfaces/IERC3156FlashLender.sol';
import {IGhoToken} from '../../gho/interfaces/IGhoToken.sol';
import {IGhoFacilitator} from '../../gho/interfaces/IGhoFacilitator.sol';
import {IGhoFlashMinter} from './interfaces/IGhoFlashMinter.sol';

/**
 * @title GhoFlashMinter
 * @author Aave
 * @notice Contract that enables FlashMinting of GHO.
 * @dev Based heavily on the EIP3156 reference implementation
 */
contract GhoFlashMinter is IGhoFlashMinter {
  using PercentageMath for uint256;

  /**
   * @dev Hash of `ERC3156FlashBorrower.onFlashLoan` that must be returned by `onFlashLoan` callback
   */
  bytes32 public constant CALLBACK_SUCCESS = keccak256('ERC3156FlashBorrower.onFlashLoan');

  // @inheritdoc IGhoFlashMinter
  IPoolAddressesProvider public immutable override ADDRESSES_PROVIDER;

  // @inheritdoc IGhoFlashMinter
  uint256 public constant MAX_FEE = 10000;

  IACLManager private immutable _aclManager;

  IGhoToken private immutable GHO_TOKEN;

  /**
   * @dev Percentage fee of the flash-minted amount used to calculate the flash fee to charge
   * Expressed in bps. A value of 100 results in 1.00%
   */
  uint256 private _fee;

  address private _ghoTreasury;

  /**
   * @dev Only pool admin can call functions marked by this modifier.
   */
  modifier onlyPoolAdmin() {
    require(_aclManager.isPoolAdmin(msg.sender), 'CALLER_NOT_POOL_ADMIN');
    _;
  }

  /**
   * @dev Constructor
   * @param ghoToken The address of the GHO token contract
   * @param ghoTreasury The address of the GHO treasury
   * @param fee The percentage of the flash-mint amount that needs to be repaid, on top of the principal (in bps)
   * @param addressesProvider The address of the Aave PoolAddressesProvider
   */
  constructor(
    address ghoToken,
    address ghoTreasury,
    uint256 fee,
    address addressesProvider
  ) {
    require(fee <= MAX_FEE, 'FlashMinter: Fee out of range');
    GHO_TOKEN = IGhoToken(ghoToken);
    _ghoTreasury = ghoTreasury;
    _fee = fee;
    ADDRESSES_PROVIDER = IPoolAddressesProvider(addressesProvider);
    _aclManager = IACLManager(IPoolAddressesProvider(addressesProvider).getACLManager());
  }

  /// @inheritdoc IERC3156FlashLender
  function maxFlashLoan(address token) external view override returns (uint256) {
    if (token != address(GHO_TOKEN)) {
      return 0;
    } else {
      IGhoToken.Facilitator memory flashMinterFacilitator = GHO_TOKEN.getFacilitator(address(this));
      return flashMinterFacilitator.bucketCapacity - flashMinterFacilitator.bucketLevel;
    }
  }

  /// @inheritdoc IERC3156FlashLender
  function flashLoan(
    IERC3156FlashBorrower receiver,
    address token,
    uint256 amount,
    bytes calldata data
  ) external override returns (bool) {
    require(token == address(GHO_TOKEN), 'FlashMinter: Unsupported currency');

    uint256 fee = _aclManager.isFlashBorrower(msg.sender) ? 0 : _flashFee(amount);
    GHO_TOKEN.mint(address(receiver), amount);

    require(
      receiver.onFlashLoan(msg.sender, address(GHO_TOKEN), amount, fee, data) == CALLBACK_SUCCESS,
      'FlashMinter: Callback failed'
    );

    GHO_TOKEN.transferFrom(address(receiver), address(this), amount + fee);
    GHO_TOKEN.burn(amount);

    emit FlashMint(address(receiver), msg.sender, address(GHO_TOKEN), amount, fee);

    return true;
  }

  /// @inheritdoc IERC3156FlashLender
  function flashFee(address token, uint256 amount) external view override returns (uint256) {
    require(token == address(GHO_TOKEN), 'FlashMinter: Unsupported currency');
    return _aclManager.isFlashBorrower(msg.sender) ? 0 : _flashFee(amount);
  }

  /// @inheritdoc IGhoFacilitator
  function distributeFeesToTreasury() external virtual override {
    uint256 balance = GHO_TOKEN.balanceOf(address(this));
    GHO_TOKEN.transfer(_ghoTreasury, balance);
    emit FeesDistributedToTreasury(_ghoTreasury, address(GHO_TOKEN), balance);
  }

  // @inheritdoc IGhoFlashMinter
  function updateFee(uint256 newFee) external onlyPoolAdmin {
    require(newFee <= MAX_FEE, 'FlashMinter: Fee out of range');
    uint256 oldFee = _fee;
    _fee = newFee;
    emit FeeUpdated(oldFee, newFee);
  }

  /// @inheritdoc IGhoFlashMinter
  function getFee() external view returns (uint256) {
    return _fee;
  }

  /// @inheritdoc IGhoFacilitator
  function updateGhoTreasury(address newGhoTreasury) external override onlyPoolAdmin {
    address oldGhoTreasury = _ghoTreasury;
    _ghoTreasury = newGhoTreasury;
    emit GhoTreasuryUpdated(oldGhoTreasury, newGhoTreasury);
  }

  /// @inheritdoc IGhoFacilitator
  function getGhoTreasury() external view returns (address) {
    return _ghoTreasury;
  }

  /**
   * @notice Returns the fee to charge for a given flashloan.
   * @dev Internal function with no checks.
   * @param amount The amount of tokens to be borrowed.
   * @return The amount of `token` to be charged for the flashloan, on top of the returned principal.
   */
  function _flashFee(uint256 amount) internal view returns (uint256) {
    return amount.percentMul(_fee);
  }
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

import {IPoolAddressesProvider} from './IPoolAddressesProvider.sol';

/**
 * @title IACLManager
 * @author Aave
 * @notice Defines the basic interface for the ACL Manager
 */
interface IACLManager {
  /**
   * @notice Returns the contract address of the PoolAddressesProvider
   * @return The address of the PoolAddressesProvider
   */
  function ADDRESSES_PROVIDER() external view returns (IPoolAddressesProvider);

  /**
   * @notice Returns the identifier of the PoolAdmin role
   * @return The id of the PoolAdmin role
   */
  function POOL_ADMIN_ROLE() external view returns (bytes32);

  /**
   * @notice Returns the identifier of the EmergencyAdmin role
   * @return The id of the EmergencyAdmin role
   */
  function EMERGENCY_ADMIN_ROLE() external view returns (bytes32);

  /**
   * @notice Returns the identifier of the RiskAdmin role
   * @return The id of the RiskAdmin role
   */
  function RISK_ADMIN_ROLE() external view returns (bytes32);

  /**
   * @notice Returns the identifier of the FlashBorrower role
   * @return The id of the FlashBorrower role
   */
  function FLASH_BORROWER_ROLE() external view returns (bytes32);

  /**
   * @notice Returns the identifier of the Bridge role
   * @return The id of the Bridge role
   */
  function BRIDGE_ROLE() external view returns (bytes32);

  /**
   * @notice Returns the identifier of the AssetListingAdmin role
   * @return The id of the AssetListingAdmin role
   */
  function ASSET_LISTING_ADMIN_ROLE() external view returns (bytes32);

  /**
   * @notice Set the role as admin of a specific role.
   * @dev By default the admin role for all roles is `DEFAULT_ADMIN_ROLE`.
   * @param role The role to be managed by the admin role
   * @param adminRole The admin role
   */
  function setRoleAdmin(bytes32 role, bytes32 adminRole) external;

  /**
   * @notice Adds a new admin as PoolAdmin
   * @param admin The address of the new admin
   */
  function addPoolAdmin(address admin) external;

  /**
   * @notice Removes an admin as PoolAdmin
   * @param admin The address of the admin to remove
   */
  function removePoolAdmin(address admin) external;

  /**
   * @notice Returns true if the address is PoolAdmin, false otherwise
   * @param admin The address to check
   * @return True if the given address is PoolAdmin, false otherwise
   */
  function isPoolAdmin(address admin) external view returns (bool);

  /**
   * @notice Adds a new admin as EmergencyAdmin
   * @param admin The address of the new admin
   */
  function addEmergencyAdmin(address admin) external;

  /**
   * @notice Removes an admin as EmergencyAdmin
   * @param admin The address of the admin to remove
   */
  function removeEmergencyAdmin(address admin) external;

  /**
   * @notice Returns true if the address is EmergencyAdmin, false otherwise
   * @param admin The address to check
   * @return True if the given address is EmergencyAdmin, false otherwise
   */
  function isEmergencyAdmin(address admin) external view returns (bool);

  /**
   * @notice Adds a new admin as RiskAdmin
   * @param admin The address of the new admin
   */
  function addRiskAdmin(address admin) external;

  /**
   * @notice Removes an admin as RiskAdmin
   * @param admin The address of the admin to remove
   */
  function removeRiskAdmin(address admin) external;

  /**
   * @notice Returns true if the address is RiskAdmin, false otherwise
   * @param admin The address to check
   * @return True if the given address is RiskAdmin, false otherwise
   */
  function isRiskAdmin(address admin) external view returns (bool);

  /**
   * @notice Adds a new address as FlashBorrower
   * @param borrower The address of the new FlashBorrower
   */
  function addFlashBorrower(address borrower) external;

  /**
   * @notice Removes an address as FlashBorrower
   * @param borrower The address of the FlashBorrower to remove
   */
  function removeFlashBorrower(address borrower) external;

  /**
   * @notice Returns true if the address is FlashBorrower, false otherwise
   * @param borrower The address to check
   * @return True if the given address is FlashBorrower, false otherwise
   */
  function isFlashBorrower(address borrower) external view returns (bool);

  /**
   * @notice Adds a new address as Bridge
   * @param bridge The address of the new Bridge
   */
  function addBridge(address bridge) external;

  /**
   * @notice Removes an address as Bridge
   * @param bridge The address of the bridge to remove
   */
  function removeBridge(address bridge) external;

  /**
   * @notice Returns true if the address is Bridge, false otherwise
   * @param bridge The address to check
   * @return True if the given address is Bridge, false otherwise
   */
  function isBridge(address bridge) external view returns (bool);

  /**
   * @notice Adds a new admin as AssetListingAdmin
   * @param admin The address of the new admin
   */
  function addAssetListingAdmin(address admin) external;

  /**
   * @notice Removes an admin as AssetListingAdmin
   * @param admin The address of the admin to remove
   */
  function removeAssetListingAdmin(address admin) external;

  /**
   * @notice Returns true if the address is AssetListingAdmin, false otherwise
   * @param admin The address to check
   * @return True if the given address is AssetListingAdmin, false otherwise
   */
  function isAssetListingAdmin(address admin) external view returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

/**
 * @title IPoolAddressesProvider
 * @author Aave
 * @notice Defines the basic interface for a Pool Addresses Provider.
 */
interface IPoolAddressesProvider {
  /**
   * @dev Emitted when the market identifier is updated.
   * @param oldMarketId The old id of the market
   * @param newMarketId The new id of the market
   */
  event MarketIdSet(string indexed oldMarketId, string indexed newMarketId);

  /**
   * @dev Emitted when the pool is updated.
   * @param oldAddress The old address of the Pool
   * @param newAddress The new address of the Pool
   */
  event PoolUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the pool configurator is updated.
   * @param oldAddress The old address of the PoolConfigurator
   * @param newAddress The new address of the PoolConfigurator
   */
  event PoolConfiguratorUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the price oracle is updated.
   * @param oldAddress The old address of the PriceOracle
   * @param newAddress The new address of the PriceOracle
   */
  event PriceOracleUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the ACL manager is updated.
   * @param oldAddress The old address of the ACLManager
   * @param newAddress The new address of the ACLManager
   */
  event ACLManagerUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the ACL admin is updated.
   * @param oldAddress The old address of the ACLAdmin
   * @param newAddress The new address of the ACLAdmin
   */
  event ACLAdminUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the price oracle sentinel is updated.
   * @param oldAddress The old address of the PriceOracleSentinel
   * @param newAddress The new address of the PriceOracleSentinel
   */
  event PriceOracleSentinelUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the pool data provider is updated.
   * @param oldAddress The old address of the PoolDataProvider
   * @param newAddress The new address of the PoolDataProvider
   */
  event PoolDataProviderUpdated(address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when a new proxy is created.
   * @param id The identifier of the proxy
   * @param proxyAddress The address of the created proxy contract
   * @param implementationAddress The address of the implementation contract
   */
  event ProxyCreated(
    bytes32 indexed id,
    address indexed proxyAddress,
    address indexed implementationAddress
  );

  /**
   * @dev Emitted when a new non-proxied contract address is registered.
   * @param id The identifier of the contract
   * @param oldAddress The address of the old contract
   * @param newAddress The address of the new contract
   */
  event AddressSet(bytes32 indexed id, address indexed oldAddress, address indexed newAddress);

  /**
   * @dev Emitted when the implementation of the proxy registered with id is updated
   * @param id The identifier of the contract
   * @param proxyAddress The address of the proxy contract
   * @param oldImplementationAddress The address of the old implementation contract
   * @param newImplementationAddress The address of the new implementation contract
   */
  event AddressSetAsProxy(
    bytes32 indexed id,
    address indexed proxyAddress,
    address oldImplementationAddress,
    address indexed newImplementationAddress
  );

  /**
   * @notice Returns the id of the Aave market to which this contract points to.
   * @return The market id
   */
  function getMarketId() external view returns (string memory);

  /**
   * @notice Associates an id with a specific PoolAddressesProvider.
   * @dev This can be used to create an onchain registry of PoolAddressesProviders to
   * identify and validate multiple Aave markets.
   * @param newMarketId The market id
   */
  function setMarketId(string calldata newMarketId) external;

  /**
   * @notice Returns an address by its identifier.
   * @dev The returned address might be an EOA or a contract, potentially proxied
   * @dev It returns ZERO if there is no registered address with the given id
   * @param id The id
   * @return The address of the registered for the specified id
   */
  function getAddress(bytes32 id) external view returns (address);

  /**
   * @notice General function to update the implementation of a proxy registered with
   * certain `id`. If there is no proxy registered, it will instantiate one and
   * set as implementation the `newImplementationAddress`.
   * @dev IMPORTANT Use this function carefully, only for ids that don't have an explicit
   * setter function, in order to avoid unexpected consequences
   * @param id The id
   * @param newImplementationAddress The address of the new implementation
   */
  function setAddressAsProxy(bytes32 id, address newImplementationAddress) external;

  /**
   * @notice Sets an address for an id replacing the address saved in the addresses map.
   * @dev IMPORTANT Use this function carefully, as it will do a hard replacement
   * @param id The id
   * @param newAddress The address to set
   */
  function setAddress(bytes32 id, address newAddress) external;

  /**
   * @notice Returns the address of the Pool proxy.
   * @return The Pool proxy address
   */
  function getPool() external view returns (address);

  /**
   * @notice Updates the implementation of the Pool, or creates a proxy
   * setting the new `pool` implementation when the function is called for the first time.
   * @param newPoolImpl The new Pool implementation
   */
  function setPoolImpl(address newPoolImpl) external;

  /**
   * @notice Returns the address of the PoolConfigurator proxy.
   * @return The PoolConfigurator proxy address
   */
  function getPoolConfigurator() external view returns (address);

  /**
   * @notice Updates the implementation of the PoolConfigurator, or creates a proxy
   * setting the new `PoolConfigurator` implementation when the function is called for the first time.
   * @param newPoolConfiguratorImpl The new PoolConfigurator implementation
   */
  function setPoolConfiguratorImpl(address newPoolConfiguratorImpl) external;

  /**
   * @notice Returns the address of the price oracle.
   * @return The address of the PriceOracle
   */
  function getPriceOracle() external view returns (address);

  /**
   * @notice Updates the address of the price oracle.
   * @param newPriceOracle The address of the new PriceOracle
   */
  function setPriceOracle(address newPriceOracle) external;

  /**
   * @notice Returns the address of the ACL manager.
   * @return The address of the ACLManager
   */
  function getACLManager() external view returns (address);

  /**
   * @notice Updates the address of the ACL manager.
   * @param newAclManager The address of the new ACLManager
   */
  function setACLManager(address newAclManager) external;

  /**
   * @notice Returns the address of the ACL admin.
   * @return The address of the ACL admin
   */
  function getACLAdmin() external view returns (address);

  /**
   * @notice Updates the address of the ACL admin.
   * @param newAclAdmin The address of the new ACL admin
   */
  function setACLAdmin(address newAclAdmin) external;

  /**
   * @notice Returns the address of the price oracle sentinel.
   * @return The address of the PriceOracleSentinel
   */
  function getPriceOracleSentinel() external view returns (address);

  /**
   * @notice Updates the address of the price oracle sentinel.
   * @param newPriceOracleSentinel The address of the new PriceOracleSentinel
   */
  function setPriceOracleSentinel(address newPriceOracleSentinel) external;

  /**
   * @notice Returns the address of the data provider.
   * @return The address of the DataProvider
   */
  function getPoolDataProvider() external view returns (address);

  /**
   * @notice Updates the address of the data provider.
   * @param newDataProvider The address of the new DataProvider
   */
  function setPoolDataProvider(address newDataProvider) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;

/**
 * @title PercentageMath library
 * @author Aave
 * @notice Provides functions to perform percentage calculations
 * @dev Percentages are defined by default with 2 decimals of precision (100.00). The precision is indicated by PERCENTAGE_FACTOR
 * @dev Operations are rounded. If a value is >=.5, will be rounded up, otherwise rounded down.
 */
library PercentageMath {
  // Maximum percentage factor (100.00%)
  uint256 internal constant PERCENTAGE_FACTOR = 1e4;

  // Half percentage factor (50.00%)
  uint256 internal constant HALF_PERCENTAGE_FACTOR = 0.5e4;

  /**
   * @notice Executes a percentage multiplication
   * @dev assembly optimized for improved gas savings, see https://twitter.com/transmissions11/status/1451131036377571328
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return result value percentmul percentage
   */
  function percentMul(uint256 value, uint256 percentage) internal pure returns (uint256 result) {
    // to avoid overflow, value <= (type(uint256).max - HALF_PERCENTAGE_FACTOR) / percentage
    assembly {
      if iszero(
        or(
          iszero(percentage),
          iszero(gt(value, div(sub(not(0), HALF_PERCENTAGE_FACTOR), percentage)))
        )
      ) {
        revert(0, 0)
      }

      result := div(add(mul(value, percentage), HALF_PERCENTAGE_FACTOR), PERCENTAGE_FACTOR)
    }
  }

  /**
   * @notice Executes a percentage division
   * @dev assembly optimized for improved gas savings, see https://twitter.com/transmissions11/status/1451131036377571328
   * @param value The value of which the percentage needs to be calculated
   * @param percentage The percentage of the value to be calculated
   * @return result value percentdiv percentage
   */
  function percentDiv(uint256 value, uint256 percentage) internal pure returns (uint256 result) {
    // to avoid overflow, value <= (type(uint256).max - halfPercentage) / PERCENTAGE_FACTOR
    assembly {
      if or(
        iszero(percentage),
        iszero(iszero(gt(value, div(sub(not(0), div(percentage, 2)), PERCENTAGE_FACTOR))))
      ) {
        revert(0, 0)
      }

      result := div(add(mul(value, PERCENTAGE_FACTOR), div(percentage, 2)), percentage)
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (interfaces/IERC3156FlashBorrower.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC3156 FlashBorrower, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashBorrower {
    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "IERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC3156FlashLender.sol)

pragma solidity ^0.8.0;

import "./IERC3156FlashBorrower.sol";

/**
 * @dev Interface of the ERC3156 FlashLender, as defined in
 * https://eips.ethereum.org/EIPS/eip-3156[ERC-3156].
 *
 * _Available since v4.1._
 */
interface IERC3156FlashLender {
    /**
     * @dev The amount of currency available to be lended.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(address token) external view returns (uint256);

    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(address token, uint256 amount) external view returns (uint256);

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// 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);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC3156FlashLender} from '@openzeppelin/contracts/interfaces/IERC3156FlashLender.sol';
import {IPoolAddressesProvider} from '@aave/core-v3/contracts/interfaces/IPoolAddressesProvider.sol';
import {IGhoFacilitator} from '../../../gho/interfaces/IGhoFacilitator.sol';

/**
 * @title IGhoFlashMinter
 * @author Aave
 * @notice Defines the behavior of the GHO Flash Minter
 */
interface IGhoFlashMinter is IERC3156FlashLender, IGhoFacilitator {
  /**
   * @dev Emitted when the percentage fee is updated
   * @param oldFee The old fee (in bps)
   * @param newFee The new fee (in bps)
   */
  event FeeUpdated(uint256 oldFee, uint256 newFee);

  /**
   * @dev Emitted when a FlashMint occurs
   * @param receiver The receiver of the FlashMinted tokens (it is also the receiver of the callback)
   * @param initiator The address initiating the FlashMint
   * @param asset The asset being FlashMinted. Always GHO.
   * @param amount The principal being FlashMinted
   * @param fee The fee returned on top of the principal
   */
  event FlashMint(
    address indexed receiver,
    address indexed initiator,
    address asset,
    uint256 indexed amount,
    uint256 fee
  );

  /**
   * @notice Returns the address of the Aave Pool Addresses Provider contract
   * @return The address of the PoolAddressesProvider
   */
  function ADDRESSES_PROVIDER() external view returns (IPoolAddressesProvider);

  /**
   * @notice Returns the maximum value the fee can be set to
   * @return The maximum percentage fee of the flash-minted amount that the flashFee can be set to (in bps).
   */
  function MAX_FEE() external view returns (uint256);

  /**
   * @notice Updates the percentage fee. It is the percentage of the flash-minted amount that needs to be repaid.
   * @dev The fee is expressed in bps. A value of 100, results in 1.00%
   * @param newFee The new percentage fee (in bps)
   */
  function updateFee(uint256 newFee) external;

  /**
   * @notice Returns the percentage of each flash mint taken as a fee
   * @return The percentage fee of the flash-minted amount that needs to be repaid, on top of the principal (in bps).
   */
  function getFee() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev Interface of a burnable erc-20 token
 */
interface IERC20Burnable {
  /**
   * @dev Destroys `amount` tokens from caller
   * @param amount The amount of tokens to destroy
   */
  function burn(uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @dev Interface of a mintable erc-20 token
 */
interface IERC20Mintable {
  /**
   * @dev Creates `amount` new tokens for `account`
   * @param account The address to create tokens for
   * @param amount The amount of tokens to create
   */
  function mint(address account, uint256 amount) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/**
 * @title IGhoFacilitator
 * @author Aave
 * @notice Defines the behavior of a Gho Facilitator
 */
interface IGhoFacilitator {
  /**
   * @dev Emitted when fees are distributed to the GhoTreasury
   * @param ghoTreasury The address of the ghoTreasury
   * @param asset The address of the asset transferred to the ghoTreasury
   * @param amount The amount of the asset transferred to the ghoTreasury
   */
  event FeesDistributedToTreasury(
    address indexed ghoTreasury,
    address indexed asset,
    uint256 amount
  );

  /**
   * @dev Emitted when Gho Treasury address is updated
   * @param oldGhoTreasury The address of the old GhoTreasury contract
   * @param newGhoTreasury The address of the new GhoTreasury contract
   */
  event GhoTreasuryUpdated(address indexed oldGhoTreasury, address indexed newGhoTreasury);

  /**
   * @notice Distribute fees to the GhoTreasury
   */
  function distributeFeesToTreasury() external;

  /**
   * @notice Updates the address of the Gho Treasury
   * @dev WARNING: The GhoTreasury is where revenue fees are sent to. Update carefully
   * @param newGhoTreasury The address of the GhoTreasury
   */
  function updateGhoTreasury(address newGhoTreasury) external;

  /**
   * @notice Returns the address of the Gho Treasury
   * @return The address of the GhoTreasury contract
   */
  function getGhoTreasury() external view returns (address);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import {IERC20Burnable} from './IERC20Burnable.sol';
import {IERC20Mintable} from './IERC20Mintable.sol';

/**
 * @title IGhoToken
 * @author Aave
 */
interface IGhoToken is IERC20Burnable, IERC20Mintable, IERC20 {
  struct Facilitator {
    uint128 bucketCapacity;
    uint128 bucketLevel;
    string label;
  }

  /**
   * @dev Emitted when a new facilitator is added
   * @param facilitatorAddress The address of the new facilitator
   * @param label A hashed human readable identifier for the facilitator
   * @param bucketCapacity The initial capacity of the facilitator's bucket
   */
  event FacilitatorAdded(
    address indexed facilitatorAddress,
    bytes32 indexed label,
    uint256 bucketCapacity
  );

  /**
   * @dev Emitted when a facilitator is removed
   * @param facilitatorAddress The address of the removed facilitator
   */
  event FacilitatorRemoved(address indexed facilitatorAddress);

  /**
   * @dev Emitted when the bucket capacity of a facilitator is updated
   * @param facilitatorAddress The address of the facilitator whose bucket capacity is being changed
   * @param oldCapacity The old capacity of the bucket
   * @param newCapacity The new capacity of the bucket
   */
  event FacilitatorBucketCapacityUpdated(
    address indexed facilitatorAddress,
    uint256 oldCapacity,
    uint256 newCapacity
  );

  /**
   * @dev Emitted when the bucket level changed
   * @param facilitatorAddress The address of the facilitator whose bucket level is being changed
   * @param oldLevel The old level of the bucket
   * @param newLevel The new level of the bucket
   */
  event FacilitatorBucketLevelUpdated(
    address indexed facilitatorAddress,
    uint256 oldLevel,
    uint256 newLevel
  );

  /**
   * @notice Add the facilitator passed with the parameters to the facilitators list.
   * @param facilitatorAddress The address of the facilitator to add
   * @param facilitatorConfig The configuration of the facilitator
   */
  function addFacilitator(address facilitatorAddress, Facilitator memory facilitatorConfig)
    external;

  /**
   * @notice Remove the facilitator from the facilitators list.
   * @param facilitatorAddress The address of the facilitator to remove
   */
  function removeFacilitator(address facilitatorAddress) external;

  /**
   * @notice Set the bucket capacity of the facilitator.
   * @param facilitator The address of the facilitator
   * @param newCapacity The new capacity of the bucket
   */
  function setFacilitatorBucketCapacity(address facilitator, uint128 newCapacity) external;

  /**
   * @notice Returns the facilitator data
   * @param facilitator The address of the facilitator
   * @return The facilitator configuration
   */
  function getFacilitator(address facilitator) external view returns (Facilitator memory);

  /**
   * @notice Returns the bucket configuration of the facilitator
   * @param facilitator The address of the facilitator
   * @return The capacity of the facilitator's bucket
   * @return The level of the facilitator's bucket
   */
  function getFacilitatorBucket(address facilitator) external view returns (uint256, uint256);

  /**
   * @notice Returns the list of the addresses of the active facilitator
   * @return The list of the facilitators addresses
   */
  function getFacilitatorsList() external view returns (address[] memory);
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

[{"inputs":[{"internalType":"address","name":"ghoToken","type":"address"},{"internalType":"address","name":"ghoTreasury","type":"address"},{"internalType":"uint256","name":"fee","type":"uint256"},{"internalType":"address","name":"addressesProvider","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"oldFee","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"FeeUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"ghoTreasury","type":"address"},{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"FeesDistributedToTreasury","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"receiver","type":"address"},{"indexed":true,"internalType":"address","name":"initiator","type":"address"},{"indexed":false,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"FlashMint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldGhoTreasury","type":"address"},{"indexed":true,"internalType":"address","name":"newGhoTreasury","type":"address"}],"name":"GhoTreasuryUpdated","type":"event"},{"inputs":[],"name":"ADDRESSES_PROVIDER","outputs":[{"internalType":"contract IPoolAddressesProvider","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"CALLBACK_SUCCESS","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"distributeFeesToTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"flashFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC3156FlashBorrower","name":"receiver","type":"address"},{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"flashLoan","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"getFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getGhoTreasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"maxFlashLoan","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newFee","type":"uint256"}],"name":"updateFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newGhoTreasury","type":"address"}],"name":"updateGhoTreasury","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000cbe9771ed31e761b744d3cb9ef78a1f32dd992110000000000000000000000001a47958e231848c664863d213bc27b018934477d00000000000000000000000000000000000000000000000000000000000000640000000000000000000000004dd5ab8fb385f2e12ade435ba7afa812f1d364d0

-----Decoded View---------------
Arg [0] : ghoToken (address): 0xcbE9771eD31e761b744D3cB9eF78A1f32DD99211
Arg [1] : ghoTreasury (address): 0x1A47958e231848C664863D213bC27b018934477D
Arg [2] : fee (uint256): 100
Arg [3] : addressesProvider (address): 0x4dd5ab8Fb385F2e12aDe435ba7AFA812F1d364D0

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000cbe9771ed31e761b744d3cb9ef78a1f32dd99211
Arg [1] : 0000000000000000000000001a47958e231848c664863d213bc27b018934477d
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000064
Arg [3] : 0000000000000000000000004dd5ab8fb385f2e12ade435ba7afa812f1d364d0