Contract Source Code:

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

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
  function _msgSender() internal view virtual returns (address payable) {
    return payable(msg.sender);
  }

  function _msgData() internal view virtual returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import './Context.sol';

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
  address private _owner;

  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  /**
   * @dev Initializes the contract setting the deployer as the initial owner.
   */
  constructor() {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view returns (address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(_owner == _msgSender(), 'Ownable: caller is not the owner');
    _;
  }

  /**
   * @dev Leaves the contract without owner. It will not be possible to call
   * `onlyOwner` functions anymore. Can only be called by the current owner.
   *
   * NOTE: Renouncing ownership will leave the contract without an owner,
   * thereby removing any functionality that is only available to the owner.
   */
  function renounceOwnership() public virtual onlyOwner {
    emit OwnershipTransferred(_owner, address(0));
    _owner = address(0);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   * Can only be called by the current owner.
   */
  function transferOwnership(address newOwner) public virtual onlyOwner {
    require(newOwner != address(0), 'Ownable: new owner is the zero address');
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

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

/**
 * @title IPoolAddressesProviderRegistry
 * @author Aave
 * @notice Defines the basic interface for an Aave Pool Addresses Provider Registry.
 */
interface IPoolAddressesProviderRegistry {
  /**
   * @dev Emitted when a new AddressesProvider is registered.
   * @param addressesProvider The address of the registered PoolAddressesProvider
   * @param id The id of the registered PoolAddressesProvider
   */
  event AddressesProviderRegistered(address indexed addressesProvider, uint256 indexed id);

  /**
   * @dev Emitted when an AddressesProvider is unregistered.
   * @param addressesProvider The address of the unregistered PoolAddressesProvider
   * @param id The id of the unregistered PoolAddressesProvider
   */
  event AddressesProviderUnregistered(address indexed addressesProvider, uint256 indexed id);

  /**
   * @notice Returns the list of registered addresses providers
   * @return The list of addresses providers
   */
  function getAddressesProvidersList() external view returns (address[] memory);

  /**
   * @notice Returns the id of a registered PoolAddressesProvider
   * @param addressesProvider The address of the PoolAddressesProvider
   * @return The id of the PoolAddressesProvider or 0 if is not registered
   */
  function getAddressesProviderIdByAddress(
    address addressesProvider
  ) external view returns (uint256);

  /**
   * @notice Returns the address of a registered PoolAddressesProvider
   * @param id The id of the market
   * @return The address of the PoolAddressesProvider with the given id or zero address if it is not registered
   */
  function getAddressesProviderAddressById(uint256 id) external view returns (address);

  /**
   * @notice Registers an addresses provider
   * @dev The PoolAddressesProvider must not already be registered in the registry
   * @dev The id must not be used by an already registered PoolAddressesProvider
   * @param provider The address of the new PoolAddressesProvider
   * @param id The id for the new PoolAddressesProvider, referring to the market it belongs to
   */
  function registerAddressesProvider(address provider, uint256 id) external;

  /**
   * @notice Removes an addresses provider from the list of registered addresses providers
   * @param provider The PoolAddressesProvider address
   */
  function unregisterAddressesProvider(address provider) external;
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.10;

import {Ownable} from '../../dependencies/openzeppelin/contracts/Ownable.sol';
import {Errors} from '../libraries/helpers/Errors.sol';
import {IPoolAddressesProviderRegistry} from '../../interfaces/IPoolAddressesProviderRegistry.sol';

/**
 * @title PoolAddressesProviderRegistry
 * @author Aave
 * @notice Main registry of PoolAddressesProvider of Aave markets.
 * @dev Used for indexing purposes of Aave protocol's markets. The id assigned to a PoolAddressesProvider refers to the
 * market it is connected with, for example with `1` for the Aave main market and `2` for the next created.
 */
contract PoolAddressesProviderRegistry is Ownable, IPoolAddressesProviderRegistry {
  // Map of address provider ids (addressesProvider => id)
  mapping(address => uint256) private _addressesProviderToId;
  // Map of id to address provider (id => addressesProvider)
  mapping(uint256 => address) private _idToAddressesProvider;
  // List of addresses providers
  address[] private _addressesProvidersList;
  // Map of address provider list indexes (addressesProvider => indexInList)
  mapping(address => uint256) private _addressesProvidersIndexes;

  /**
   * @dev Constructor.
   * @param owner The owner address of this contract.
   */
  constructor(address owner) {
    transferOwnership(owner);
  }

  /// @inheritdoc IPoolAddressesProviderRegistry
  function getAddressesProvidersList() external view override returns (address[] memory) {
    return _addressesProvidersList;
  }

  /// @inheritdoc IPoolAddressesProviderRegistry
  function registerAddressesProvider(address provider, uint256 id) external override onlyOwner {
    require(id != 0, Errors.INVALID_ADDRESSES_PROVIDER_ID);
    require(_idToAddressesProvider[id] == address(0), Errors.INVALID_ADDRESSES_PROVIDER_ID);
    require(_addressesProviderToId[provider] == 0, Errors.ADDRESSES_PROVIDER_ALREADY_ADDED);

    _addressesProviderToId[provider] = id;
    _idToAddressesProvider[id] = provider;

    _addToAddressesProvidersList(provider);
    emit AddressesProviderRegistered(provider, id);
  }

  /// @inheritdoc IPoolAddressesProviderRegistry
  function unregisterAddressesProvider(address provider) external override onlyOwner {
    require(_addressesProviderToId[provider] != 0, Errors.ADDRESSES_PROVIDER_NOT_REGISTERED);
    uint256 oldId = _addressesProviderToId[provider];
    _idToAddressesProvider[oldId] = address(0);
    _addressesProviderToId[provider] = 0;

    _removeFromAddressesProvidersList(provider);

    emit AddressesProviderUnregistered(provider, oldId);
  }

  /// @inheritdoc IPoolAddressesProviderRegistry
  function getAddressesProviderIdByAddress(
    address addressesProvider
  ) external view override returns (uint256) {
    return _addressesProviderToId[addressesProvider];
  }

  /// @inheritdoc IPoolAddressesProviderRegistry
  function getAddressesProviderAddressById(uint256 id) external view override returns (address) {
    return _idToAddressesProvider[id];
  }

  /**
   * @notice Adds the addresses provider address to the list.
   * @param provider The address of the PoolAddressesProvider
   */
  function _addToAddressesProvidersList(address provider) internal {
    _addressesProvidersIndexes[provider] = _addressesProvidersList.length;
    _addressesProvidersList.push(provider);
  }

  /**
   * @notice Removes the addresses provider address from the list.
   * @param provider The address of the PoolAddressesProvider
   */
  function _removeFromAddressesProvidersList(address provider) internal {
    uint256 index = _addressesProvidersIndexes[provider];

    _addressesProvidersIndexes[provider] = 0;

    // Swap the index of the last addresses provider in the list with the index of the provider to remove
    uint256 lastIndex = _addressesProvidersList.length - 1;
    if (index < lastIndex) {
      address lastProvider = _addressesProvidersList[lastIndex];
      _addressesProvidersList[index] = lastProvider;
      _addressesProvidersIndexes[lastProvider] = index;
    }
    _addressesProvidersList.pop();
  }
}

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

/**
 * @title Errors library
 * @author Aave
 * @notice Defines the error messages emitted by the different contracts of the Aave protocol
 */
library Errors {
  string public constant CALLER_NOT_POOL_ADMIN = '1'; // 'The caller of the function is not a pool admin'
  string public constant CALLER_NOT_EMERGENCY_ADMIN = '2'; // 'The caller of the function is not an emergency admin'
  string public constant CALLER_NOT_POOL_OR_EMERGENCY_ADMIN = '3'; // 'The caller of the function is not a pool or emergency admin'
  string public constant CALLER_NOT_RISK_OR_POOL_ADMIN = '4'; // 'The caller of the function is not a risk or pool admin'
  string public constant CALLER_NOT_ASSET_LISTING_OR_POOL_ADMIN = '5'; // 'The caller of the function is not an asset listing or pool admin'
  string public constant CALLER_NOT_BRIDGE = '6'; // 'The caller of the function is not a bridge'
  string public constant ADDRESSES_PROVIDER_NOT_REGISTERED = '7'; // 'Pool addresses provider is not registered'
  string public constant INVALID_ADDRESSES_PROVIDER_ID = '8'; // 'Invalid id for the pool addresses provider'
  string public constant NOT_CONTRACT = '9'; // 'Address is not a contract'
  string public constant CALLER_NOT_POOL_CONFIGURATOR = '10'; // 'The caller of the function is not the pool configurator'
  string public constant CALLER_NOT_ATOKEN = '11'; // 'The caller of the function is not an AToken'
  string public constant INVALID_ADDRESSES_PROVIDER = '12'; // 'The address of the pool addresses provider is invalid'
  string public constant INVALID_FLASHLOAN_EXECUTOR_RETURN = '13'; // 'Invalid return value of the flashloan executor function'
  string public constant RESERVE_ALREADY_ADDED = '14'; // 'Reserve has already been added to reserve list'
  string public constant NO_MORE_RESERVES_ALLOWED = '15'; // 'Maximum amount of reserves in the pool reached'
  string public constant EMODE_CATEGORY_RESERVED = '16'; // 'Zero eMode category is reserved for volatile heterogeneous assets'
  string public constant INVALID_EMODE_CATEGORY_ASSIGNMENT = '17'; // 'Invalid eMode category assignment to asset'
  string public constant RESERVE_LIQUIDITY_NOT_ZERO = '18'; // 'The liquidity of the reserve needs to be 0'
  string public constant FLASHLOAN_PREMIUM_INVALID = '19'; // 'Invalid flashloan premium'
  string public constant INVALID_RESERVE_PARAMS = '20'; // 'Invalid risk parameters for the reserve'
  string public constant INVALID_EMODE_CATEGORY_PARAMS = '21'; // 'Invalid risk parameters for the eMode category'
  string public constant BRIDGE_PROTOCOL_FEE_INVALID = '22'; // 'Invalid bridge protocol fee'
  string public constant CALLER_MUST_BE_POOL = '23'; // 'The caller of this function must be a pool'
  string public constant INVALID_MINT_AMOUNT = '24'; // 'Invalid amount to mint'
  string public constant INVALID_BURN_AMOUNT = '25'; // 'Invalid amount to burn'
  string public constant INVALID_AMOUNT = '26'; // 'Amount must be greater than 0'
  string public constant RESERVE_INACTIVE = '27'; // 'Action requires an active reserve'
  string public constant RESERVE_FROZEN = '28'; // 'Action cannot be performed because the reserve is frozen'
  string public constant RESERVE_PAUSED = '29'; // 'Action cannot be performed because the reserve is paused'
  string public constant BORROWING_NOT_ENABLED = '30'; // 'Borrowing is not enabled'
  string public constant STABLE_BORROWING_NOT_ENABLED = '31'; // 'Stable borrowing is not enabled'
  string public constant NOT_ENOUGH_AVAILABLE_USER_BALANCE = '32'; // 'User cannot withdraw more than the available balance'
  string public constant INVALID_INTEREST_RATE_MODE_SELECTED = '33'; // 'Invalid interest rate mode selected'
  string public constant COLLATERAL_BALANCE_IS_ZERO = '34'; // 'The collateral balance is 0'
  string public constant HEALTH_FACTOR_LOWER_THAN_LIQUIDATION_THRESHOLD = '35'; // 'Health factor is lesser than the liquidation threshold'
  string public constant COLLATERAL_CANNOT_COVER_NEW_BORROW = '36'; // 'There is not enough collateral to cover a new borrow'
  string public constant COLLATERAL_SAME_AS_BORROWING_CURRENCY = '37'; // 'Collateral is (mostly) the same currency that is being borrowed'
  string public constant AMOUNT_BIGGER_THAN_MAX_LOAN_SIZE_STABLE = '38'; // 'The requested amount is greater than the max loan size in stable rate mode'
  string public constant NO_DEBT_OF_SELECTED_TYPE = '39'; // 'For repayment of a specific type of debt, the user needs to have debt that type'
  string public constant NO_EXPLICIT_AMOUNT_TO_REPAY_ON_BEHALF = '40'; // 'To repay on behalf of a user an explicit amount to repay is needed'
  string public constant NO_OUTSTANDING_STABLE_DEBT = '41'; // 'User does not have outstanding stable rate debt on this reserve'
  string public constant NO_OUTSTANDING_VARIABLE_DEBT = '42'; // 'User does not have outstanding variable rate debt on this reserve'
  string public constant UNDERLYING_BALANCE_ZERO = '43'; // 'The underlying balance needs to be greater than 0'
  string public constant INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET = '44'; // 'Interest rate rebalance conditions were not met'
  string public constant HEALTH_FACTOR_NOT_BELOW_THRESHOLD = '45'; // 'Health factor is not below the threshold'
  string public constant COLLATERAL_CANNOT_BE_LIQUIDATED = '46'; // 'The collateral chosen cannot be liquidated'
  string public constant SPECIFIED_CURRENCY_NOT_BORROWED_BY_USER = '47'; // 'User did not borrow the specified currency'
  string public constant INCONSISTENT_FLASHLOAN_PARAMS = '49'; // 'Inconsistent flashloan parameters'
  string public constant BORROW_CAP_EXCEEDED = '50'; // 'Borrow cap is exceeded'
  string public constant SUPPLY_CAP_EXCEEDED = '51'; // 'Supply cap is exceeded'
  string public constant UNBACKED_MINT_CAP_EXCEEDED = '52'; // 'Unbacked mint cap is exceeded'
  string public constant DEBT_CEILING_EXCEEDED = '53'; // 'Debt ceiling is exceeded'
  string public constant UNDERLYING_CLAIMABLE_RIGHTS_NOT_ZERO = '54'; // 'Claimable rights over underlying not zero (aToken supply or accruedToTreasury)'
  string public constant STABLE_DEBT_NOT_ZERO = '55'; // 'Stable debt supply is not zero'
  string public constant VARIABLE_DEBT_SUPPLY_NOT_ZERO = '56'; // 'Variable debt supply is not zero'
  string public constant LTV_VALIDATION_FAILED = '57'; // 'Ltv validation failed'
  string public constant INCONSISTENT_EMODE_CATEGORY = '58'; // 'Inconsistent eMode category'
  string public constant PRICE_ORACLE_SENTINEL_CHECK_FAILED = '59'; // 'Price oracle sentinel validation failed'
  string public constant ASSET_NOT_BORROWABLE_IN_ISOLATION = '60'; // 'Asset is not borrowable in isolation mode'
  string public constant RESERVE_ALREADY_INITIALIZED = '61'; // 'Reserve has already been initialized'
  string public constant USER_IN_ISOLATION_MODE_OR_LTV_ZERO = '62'; // 'User is in isolation mode or ltv is zero'
  string public constant INVALID_LTV = '63'; // 'Invalid ltv parameter for the reserve'
  string public constant INVALID_LIQ_THRESHOLD = '64'; // 'Invalid liquidity threshold parameter for the reserve'
  string public constant INVALID_LIQ_BONUS = '65'; // 'Invalid liquidity bonus parameter for the reserve'
  string public constant INVALID_DECIMALS = '66'; // 'Invalid decimals parameter of the underlying asset of the reserve'
  string public constant INVALID_RESERVE_FACTOR = '67'; // 'Invalid reserve factor parameter for the reserve'
  string public constant INVALID_BORROW_CAP = '68'; // 'Invalid borrow cap for the reserve'
  string public constant INVALID_SUPPLY_CAP = '69'; // 'Invalid supply cap for the reserve'
  string public constant INVALID_LIQUIDATION_PROTOCOL_FEE = '70'; // 'Invalid liquidation protocol fee for the reserve'
  string public constant INVALID_EMODE_CATEGORY = '71'; // 'Invalid eMode category for the reserve'
  string public constant INVALID_UNBACKED_MINT_CAP = '72'; // 'Invalid unbacked mint cap for the reserve'
  string public constant INVALID_DEBT_CEILING = '73'; // 'Invalid debt ceiling for the reserve
  string public constant INVALID_RESERVE_INDEX = '74'; // 'Invalid reserve index'
  string public constant ACL_ADMIN_CANNOT_BE_ZERO = '75'; // 'ACL admin cannot be set to the zero address'
  string public constant INCONSISTENT_PARAMS_LENGTH = '76'; // 'Array parameters that should be equal length are not'
  string public constant ZERO_ADDRESS_NOT_VALID = '77'; // 'Zero address not valid'
  string public constant INVALID_EXPIRATION = '78'; // 'Invalid expiration'
  string public constant INVALID_SIGNATURE = '79'; // 'Invalid signature'
  string public constant OPERATION_NOT_SUPPORTED = '80'; // 'Operation not supported'
  string public constant DEBT_CEILING_NOT_ZERO = '81'; // 'Debt ceiling is not zero'
  string public constant ASSET_NOT_LISTED = '82'; // 'Asset is not listed'
  string public constant INVALID_OPTIMAL_USAGE_RATIO = '83'; // 'Invalid optimal usage ratio'
  string public constant INVALID_OPTIMAL_STABLE_TO_TOTAL_DEBT_RATIO = '84'; // 'Invalid optimal stable to total debt ratio'
  string public constant UNDERLYING_CANNOT_BE_RESCUED = '85'; // 'The underlying asset cannot be rescued'
  string public constant ADDRESSES_PROVIDER_ALREADY_ADDED = '86'; // 'Reserve has already been added to reserve list'
  string public constant POOL_ADDRESSES_DO_NOT_MATCH = '87'; // 'The token implementation pool address and the pool address provided by the initializing pool do not match'
  string public constant STABLE_BORROWING_ENABLED = '88'; // 'Stable borrowing is enabled'
  string public constant SILOED_BORROWING_VIOLATION = '89'; // 'User is trying to borrow multiple assets including a siloed one'
  string public constant RESERVE_DEBT_NOT_ZERO = '90'; // the total debt of the reserve needs to be 0
  string public constant FLASHLOAN_DISABLED = '91'; // FlashLoaning for this asset is disabled
}