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Outline

•    - function _msgSender()
•    - function _msgData()
•  contract Ownable is Context
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
• interface IPriceOracleGetter
•    - function getAssetPrice(address asset)
• interface IChainlinkAggregator
•    - function latestAnswer()
•  contract AaveOracle is IPriceOracl ... *
•    - function setAssetSources(address[] ca ...
•    - function setFallbackOracle(address fa ...
•    - function _setAssetsSources(address[] ...
•    - function _setFallbackOracle(address f ...
•    - function getAssetPrice(address asset)
•    - function getAssetsPrices(address[] ca ...
•    - function getSourceOfAsset(address ass ...
•    - function getFallbackOracle()

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/**
 *Submitted for verification at Etherscan.io on 2020-11-17
*/

// SPDX-License-Identifier: agpl-3.0
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 virtual view returns (address payable) {
    return msg.sender;
  }

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

/**
 * @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;
  }
}

interface IPriceOracleGetter {
  function getAssetPrice(address asset) external view returns (uint256);
}

interface IChainlinkAggregator {
  function latestAnswer() external view returns (int256);
}

/// @title AaveOracle
/// @author Aave
/// @notice Proxy smart contract to get the price of an asset from a price source, with Chainlink Aggregator
///         smart contracts as primary option
/// - If the returned price by a Chainlink aggregator is <= 0, the call is forwarded to a fallbackOracle
/// - Owned by the Aave governance system, allowed to add sources for assets, replace them
///   and change the fallbackOracle
contract AaveOracle is IPriceOracleGetter, Ownable {
  event WethSet(address indexed weth);
  event AssetSourceUpdated(address indexed asset, address indexed source);
  event FallbackOracleUpdated(address indexed fallbackOracle);

  mapping(address => IChainlinkAggregator) private assetsSources;
  IPriceOracleGetter private _fallbackOracle;
  address public immutable WETH;

  /// @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 weth
  ) public {
    _setFallbackOracle(fallbackOracle);
    _setAssetsSources(assets, sources);
    WETH = weth;
    emit WethSet(weth);
  }

  /// @notice External function called by the Aave 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
  {
    _setAssetsSources(assets, sources);
  }

  /// @notice Sets the fallbackOracle
  /// - Callable only by the Aave governance
  /// @param fallbackOracle The address of the fallbackOracle
  function setFallbackOracle(address fallbackOracle) external onlyOwner {
    _setFallbackOracle(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 _setAssetsSources(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]] = IChainlinkAggregator(sources[i]);
      emit AssetSourceUpdated(assets[i], sources[i]);
    }
  }

  /// @notice Internal function to set the fallbackOracle
  /// @param fallbackOracle The address of the fallbackOracle
  function _setFallbackOracle(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 override view returns (uint256) {
    IChainlinkAggregator source = assetsSources[asset];

    if (asset == WETH) {
      return 1 ether;
    } else if (address(source) == address(0)) {
      return _fallbackOracle.getAssetPrice(asset);
    } else {
      int256 price = IChainlinkAggregator(source).latestAnswer();
      if (price > 0) {
        return uint256(price);
      } else {
        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 asset The address of the asset
  /// @return address The address of the source
  function getSourceOfAsset(address asset) external view returns (address) {
    return address(assetsSources[asset]);
  }

  /// @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);
  }
}

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[{"inputs":[{"internalType":"address[]","name":"assets","type":"address[]"},{"internalType":"address[]","name":"sources","type":"address[]"},{"internalType":"address","name":"fallbackOracle","type":"address"},{"internalType":"address","name":"weth","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":"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"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"weth","type":"address"}],"name":"WethSet","type":"event"},{"inputs":[],"name":"WETH","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":"asset","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[]): 0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9,0x0D8775F648430679A709E98d2b0Cb6250d2887EF,0x4Fabb145d64652a948d72533023f6E7A623C7C53,0x6B175474E89094C44Da98b954EedeAC495271d0F,0xF629cBd94d3791C9250152BD8dfBDF380E2a3B9c,0xdd974D5C2e2928deA5F71b9825b8b646686BD200,0x514910771AF9Ca656af840dff83E8264EcF986CA,0x0F5D2fB29fb7d3CFeE444a200298f468908cC942,0x9f8F72aA9304c8B593d555F12eF6589cC3A579A2,0x408e41876cCCDC0F92210600ef50372656052a38,0xC011a73ee8576Fb46F5E1c5751cA3B9Fe0af2a6F,0x57Ab1ec28D129707052df4dF418D58a2D46d5f51,0x0000000000085d4780B73119b644AE5ecd22b376,0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984,0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,0xdAC17F958D2ee523a2206206994597C13D831ec7,0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599,0x0bc529c00C6401aEF6D220BE8C6Ea1667F6Ad93e,0xE41d2489571d322189246DaFA5ebDe1F4699F498,0x10F7Fc1F91Ba351f9C629c5947AD69bD03C05b96
Arg [1] : sources (address[]): 0x6Df09E975c830ECae5bd4eD9d90f3A95a4f88012,0x0d16d4528239e9ee52fa531af613AcdB23D88c94,0x614715d2Af89E6EC99A233818275142cE88d1Cfd,0x773616E4d11A78F511299002da57A0a94577F1f4,0x24D9aB51950F3d62E9144fdC2f3135DAA6Ce8D1B,0x656c0544eF4C98A6a98491833A89204Abb045d6b,0xDC530D9457755926550b59e8ECcdaE7624181557,0x82A44D92D6c329826dc557c5E1Be6ebeC5D5FeB9,0x24551a8Fb2A7211A25a17B1481f043A8a8adC7f2,0x3147D7203354Dc06D9fd350c7a2437bcA92387a4,0x79291A9d692Df95334B1a0B3B4AE6bC606782f8c,0x8e0b7e6062272B5eF4524250bFFF8e5Bd3497757,0x3886BA987236181D98F2401c507Fb8BeA7871dF2,0xD6aA3D25116d8dA79Ea0246c4826EB951872e02e,0x986b5E1e1755e3C2440e960477f25201B0a8bbD4,0xEe9F2375b4bdF6387aa8265dD4FB8F16512A1d46,0xdeb288F737066589598e9214E782fa5A8eD689e8,0x7c5d4F8345e66f68099581Db340cd65B078C41f4,0x2Da4983a622a8498bb1a21FaE9D8F6C664939962,0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
Arg [2] : fallbackOracle (address): 0x0000000000000000000000000000000000000000
Arg [3] : weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
46 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000320
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [3] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [5] : 0000000000000000000000007fc66500c84a76ad7e9c93437bfc5ac33e2ddae9
Arg [6] : 0000000000000000000000000d8775f648430679a709e98d2b0cb6250d2887ef
Arg [7] : 0000000000000000000000004fabb145d64652a948d72533023f6e7a623c7c53
Arg [8] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [9] : 000000000000000000000000f629cbd94d3791c9250152bd8dfbdf380e2a3b9c
Arg [10] : 000000000000000000000000dd974d5c2e2928dea5f71b9825b8b646686bd200
Arg [11] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [12] : 0000000000000000000000000f5d2fb29fb7d3cfee444a200298f468908cc942
Arg [13] : 0000000000000000000000009f8f72aa9304c8b593d555f12ef6589cc3a579a2
Arg [14] : 000000000000000000000000408e41876cccdc0f92210600ef50372656052a38
Arg [15] : 000000000000000000000000c011a73ee8576fb46f5e1c5751ca3b9fe0af2a6f
Arg [16] : 00000000000000000000000057ab1ec28d129707052df4df418d58a2d46d5f51
Arg [17] : 0000000000000000000000000000000000085d4780b73119b644ae5ecd22b376
Arg [18] : 0000000000000000000000001f9840a85d5af5bf1d1762f925bdaddc4201f984
Arg [19] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [20] : 000000000000000000000000dac17f958d2ee523a2206206994597c13d831ec7
Arg [21] : 0000000000000000000000002260fac5e5542a773aa44fbcfedf7c193bc2c599
Arg [22] : 0000000000000000000000000bc529c00c6401aef6d220be8c6ea1667f6ad93e
Arg [23] : 000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498
Arg [24] : 00000000000000000000000010f7fc1f91ba351f9c629c5947ad69bd03c05b96
Arg [25] : 0000000000000000000000000000000000000000000000000000000000000014
Arg [26] : 0000000000000000000000006df09e975c830ecae5bd4ed9d90f3a95a4f88012
Arg [27] : 0000000000000000000000000d16d4528239e9ee52fa531af613acdb23d88c94
Arg [28] : 000000000000000000000000614715d2af89e6ec99a233818275142ce88d1cfd
Arg [29] : 000000000000000000000000773616e4d11a78f511299002da57a0a94577f1f4
Arg [30] : 00000000000000000000000024d9ab51950f3d62e9144fdc2f3135daa6ce8d1b
Arg [31] : 000000000000000000000000656c0544ef4c98a6a98491833a89204abb045d6b
Arg [32] : 000000000000000000000000dc530d9457755926550b59e8eccdae7624181557
Arg [33] : 00000000000000000000000082a44d92d6c329826dc557c5e1be6ebec5d5feb9
Arg [34] : 00000000000000000000000024551a8fb2a7211a25a17b1481f043a8a8adc7f2
Arg [35] : 0000000000000000000000003147d7203354dc06d9fd350c7a2437bca92387a4
Arg [36] : 00000000000000000000000079291a9d692df95334b1a0b3b4ae6bc606782f8c
Arg [37] : 0000000000000000000000008e0b7e6062272b5ef4524250bfff8e5bd3497757
Arg [38] : 0000000000000000000000003886ba987236181d98f2401c507fb8bea7871df2
Arg [39] : 000000000000000000000000d6aa3d25116d8da79ea0246c4826eb951872e02e
Arg [40] : 000000000000000000000000986b5e1e1755e3c2440e960477f25201b0a8bbd4
Arg [41] : 000000000000000000000000ee9f2375b4bdf6387aa8265dd4fb8f16512a1d46
Arg [42] : 000000000000000000000000deb288f737066589598e9214e782fa5a8ed689e8
Arg [43] : 0000000000000000000000007c5d4f8345e66f68099581db340cd65b078c41f4
Arg [44] : 0000000000000000000000002da4983a622a8498bb1a21fae9d8f6c664939962
Arg [45] : 0000000000000000000000005f4ec3df9cbd43714fe2740f5e3616155c5b8419

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