/**
 *Submitted for verification at celoscan.io on 2022-07-05
*/

// Sources flattened with hardhat v2.6.4 https://hardhat.org

// File contracts/dependencies/openzeppelin/contracts/Context.sol

pragma solidity 0.6.12;

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

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

// File contracts/dependencies/openzeppelin/contracts/Ownable.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() internal {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

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

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

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

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

// File contracts/dependencies/openzeppelin/contracts/IERC20.sol

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File contracts/interfaces/IUbeswapPriceFeed.sol

interface IUbeswapPriceFeed {
  function consult() external view returns (uint256);
}

// File contracts/interfaces/IPriceOracleGetter.sol

/**
 * @title IPriceOracleGetter interface
 * @notice Interface for the Aave price oracle.
 **/

interface IPriceOracleGetter {
  /**
   * @dev returns the asset price in ETH
   * @param asset the address of the asset
   * @return the ETH price of the asset
   **/
  function getAssetPrice(address asset) external view returns (uint256);
}

// File contracts/dependencies/openzeppelin/contracts/SafeMath.sol

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, 'SafeMath: addition overflow');

    return c;
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, 'SafeMath: subtraction overflow');
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;

    return c;
  }

  /**
   * @dev Returns the multiplication of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `*` operator.
   *
   * Requirements:
   * - Multiplication cannot overflow.
   */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, 'SafeMath: multiplication overflow');

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, 'SafeMath: division by zero');
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, 'SafeMath: modulo by zero');
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

// File contracts/dependencies/openzeppelin/contracts/Address.sol

/**
 * @dev Collection of functions related to the address type
 */
library Address {
  /**
   * @dev Returns true if `account` is a contract.
   *
   * [IMPORTANT]
   * ====
   * It is unsafe to assume that an address for which this function returns
   * false is an externally-owned account (EOA) and not a contract.
   *
   * Among others, `isContract` will return false for the following
   * types of addresses:
   *
   *  - an externally-owned account
   *  - a contract in construction
   *  - an address where a contract will be created
   *  - an address where a contract lived, but was destroyed
   * ====
   */
  function isContract(address account) internal view returns (bool) {
    // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
    // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
    // for accounts without code, i.e. `keccak256('')`
    bytes32 codehash;
    bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
    // solhint-disable-next-line no-inline-assembly
    assembly {
      codehash := extcodehash(account)
    }
    return (codehash != accountHash && codehash != 0x0);
  }

  /**
   * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
   * `recipient`, forwarding all available gas and reverting on errors.
   *
   * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
   * of certain opcodes, possibly making contracts go over the 2300 gas limit
   * imposed by `transfer`, making them unable to receive funds via
   * `transfer`. {sendValue} removes this limitation.
   *
   * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
   *
   * IMPORTANT: because control is transferred to `recipient`, care must be
   * taken to not create reentrancy vulnerabilities. Consider using
   * {ReentrancyGuard} or the
   * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
   */
  function sendValue(address payable recipient, uint256 amount) internal {
    require(address(this).balance >= amount, 'Address: insufficient balance');

    // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
    (bool success, ) = recipient.call{value: amount}('');
    require(success, 'Address: unable to send value, recipient may have reverted');
  }
}

// File contracts/dependencies/openzeppelin/contracts/SafeERC20.sol

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  using SafeMath for uint256;
  using Address for address;

  function safeTransfer(
    IERC20 token,
    address to,
    uint256 value
  ) internal {
    callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
  }

  function safeTransferFrom(
    IERC20 token,
    address from,
    address to,
    uint256 value
  ) internal {
    callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
  }

  function safeApprove(
    IERC20 token,
    address spender,
    uint256 value
  ) internal {
    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 callOptionalReturn(IERC20 token, bytes memory data) private {
    require(address(token).isContract(), 'SafeERC20: call to non-contract');

    // solhint-disable-next-line avoid-low-level-calls
    (bool success, bytes memory returndata) = address(token).call(data);
    require(success, 'SafeERC20: low-level call failed');

    if (returndata.length > 0) {
      // Return data is optional
      // solhint-disable-next-line max-line-length
      require(abi.decode(returndata, (bool)), 'SafeERC20: ERC20 operation did not succeed');
    }
  }
}

// File contracts/misc/MoolaOracle.sol

/// @title MoolaOracle
/// @author Moola
/// @notice Proxy smart contract to get the price of an asset from a price source, with UbeswapPriceFeed
///         and CeloProxyPriceProvider as options
/// - CeloProxyPriceProvider is used to provide CELO prices for cUSD, cEUR, cREAL.
/// - Other tokens are using UbeswapPriceFeed.
/// - If the returned price by the source is 0, the call is forwarded to a fallbackOracle
/// - Owned by the Moola governance system, allowed to add sources for assets, replace them
///   and change the fallbackOracle
contract MoolaOracle is IPriceOracleGetter, Ownable {
  using SafeERC20 for IERC20;

  event CeloSet(address indexed celo);
  event AssetSourceUpdated(address indexed asset, address indexed source);
  event FallbackOracleUpdated(address indexed fallbackOracle);
  event CeloProxyAddressUpdated(address indexed celoProxyPriceProvider);

  mapping(address => IPriceOracleGetter) private assetsSources;

  IPriceOracleGetter private fallbackOracle;

  address public immutable CELO;

  /// @notice Constructor
  /// @param _assets The addresses of the assets
  /// @param _sources The address of the source of each asset
  /// @param _fallbackOracle The address of the fallback oracle to use if the data of an aggregator is not consistent
  constructor(
    address[] memory _assets,
    address[] memory _sources,
    address _fallbackOracle,
    address _celo
  ) public {
    internalSetFallbackOracle(_fallbackOracle);
    internalSetAssetsSources(_assets, _sources);

    CELO = _celo;

    emit CeloSet(_celo);
  }

  /// @notice External function called by the Moola governance to set or replace sources of assets
  /// @param _assets The addresses of the assets
  /// @param _sources The address of the source of each asset
  function setAssetSources(address[] calldata _assets, address[] calldata _sources)
    external
    onlyOwner
  {
    internalSetAssetsSources(_assets, _sources);
  }

  /// @notice Sets the fallbackOracle
  /// - Callable only by the Moola governance
  /// @param _fallbackOracle The address of the fallbackOracle
  function setFallbackOracle(address _fallbackOracle) external onlyOwner {
    internalSetFallbackOracle(_fallbackOracle);
  }

  /// @notice Internal function to set the sources for each asset
  /// @param _assets The addresses of the assets
  /// @param _sources The address of the source of each asset
  function internalSetAssetsSources(address[] memory _assets, address[] memory _sources) internal {
    require(_assets.length == _sources.length, 'INCONSISTENT_PARAMS_LENGTH');
    for (uint256 i = 0; i < _assets.length; i++) {
      assetsSources[_assets[i]] = IPriceOracleGetter(_sources[i]);
      emit AssetSourceUpdated(_assets[i], _sources[i]);
    }
  }

  /// @notice Internal function to set the fallbackOracle
  /// @param _fallbackOracle The address of the fallbackOracle
  function internalSetFallbackOracle(address _fallbackOracle) internal {
    fallbackOracle = IPriceOracleGetter(_fallbackOracle);
    emit FallbackOracleUpdated(_fallbackOracle);
  }

  /// @notice Gets an asset price by address
  /// @param _asset The asset address
  function getAssetPrice(address _asset) public view override returns (uint256) {
    if (_asset == CELO) {
      return 1 ether;
    }

    IPriceOracleGetter source = assetsSources[_asset];

    if (address(source) == address(0)) {
      return fallbackOracle.getAssetPrice(_asset);
    }

    uint256 price = source.getAssetPrice(_asset);

    if (price > 0) {
      return price;
    }

    return fallbackOracle.getAssetPrice(_asset);
  }

  /// @notice Gets a list of prices from a list of assets addresses
  /// @param _assets The list of assets addresses
  function getAssetsPrices(address[] calldata _assets) external view returns (uint256[] memory) {
    uint256[] memory prices = new uint256[](_assets.length);
    for (uint256 i = 0; i < _assets.length; i++) {
      prices[i] = getAssetPrice(_assets[i]);
    }
    return prices;
  }

  /// @notice Gets the address of the source for an asset address
  /// @param _assets The address of the asset
  /// @return address The address of the source
  function getSourceOfAsset(address _assets) external view returns (address) {
    return address(assetsSources[_assets]);
  }

  /// @notice Gets the address of the fallback oracle
  /// @return address The addres of the fallback oracle
  function getFallbackOracle() external view returns (address) {
    return address(fallbackOracle);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address[]","name":"_assets","type":"address[]"},{"internalType":"address[]","name":"_sources","type":"address[]"},{"internalType":"address","name":"_fallbackOracle","type":"address"},{"internalType":"address","name":"_celo","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":true,"internalType":"address","name":"source","type":"address"}],"name":"AssetSourceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"celoProxyPriceProvider","type":"address"}],"name":"CeloProxyAddressUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"celo","type":"address"}],"name":"CeloSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"fallbackOracle","type":"address"}],"name":"FallbackOracleUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"CELO","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_asset","type":"address"}],"name":"getAssetPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"_assets","type":"address[]"}],"name":"getAssetsPrices","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFallbackOracle","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_assets","type":"address"}],"name":"getSourceOfAsset","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_assets","type":"address[]"},{"internalType":"address[]","name":"_sources","type":"address[]"}],"name":"setAssetSources","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_fallbackOracle","type":"address"}],"name":"setFallbackOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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-----Decoded View---------------
Arg [0] : _assets (address[]): 0xD8763CBa276a3738E6DE85b4b3bF5FDed6D6cA73,0x765DE816845861e75A25fCA122bb6898B8B1282a,0xe8537a3d056DA446677B9E9d6c5dB704EaAb4787,0x17700282592D6917F6A73D0bF8AcCf4D578c131e
Arg [1] : _sources (address[]): 0x568547688121AA69bDEB8aEB662C321c5D7B98D0,0x568547688121AA69bDEB8aEB662C321c5D7B98D0,0x568547688121AA69bDEB8aEB662C321c5D7B98D0,0xe8E30f32141321180cC1827DE43d841F4e88B968
Arg [2] : _fallbackOracle (address): 0x0000000000000000000000000000000000000000
Arg [3] : _celo (address): 0x471EcE3750Da237f93B8E339c536989b8978a438

-----Encoded View---------------
14 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000120
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 000000000000000000000000471ece3750da237f93b8e339c536989b8978a438
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [5] : 000000000000000000000000d8763cba276a3738e6de85b4b3bf5fded6d6ca73
Arg [6] : 000000000000000000000000765de816845861e75a25fca122bb6898b8b1282a
Arg [7] : 000000000000000000000000e8537a3d056da446677b9e9d6c5db704eaab4787
Arg [8] : 00000000000000000000000017700282592d6917f6a73d0bf8accf4d578c131e
Arg [9] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [10] : 000000000000000000000000568547688121aa69bdeb8aeb662c321c5d7b98d0
Arg [11] : 000000000000000000000000568547688121aa69bdeb8aeb662c321c5d7b98d0
Arg [12] : 000000000000000000000000568547688121aa69bdeb8aeb662c321c5d7b98d0
Arg [13] : 000000000000000000000000e8e30f32141321180cc1827de43d841f4e88b968

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