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Enter the Solidity Contract Code

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface OwnableInterface {
  function owner() external returns (address);

function transferOwnership(address recipient) external;

function acceptOwnership() external;
}

// File contracts/ConfirmedOwnerWithProposal.sol

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwnerWithProposal is OwnableInterface {
  address private s_owner;
  address private s_pendingOwner;

event OwnershipTransferRequested(address indexed from, address indexed to);
  event OwnershipTransferred(address indexed from, address indexed to);

constructor(address newOwner, address pendingOwner) {
    require(newOwner != address(0), "Cannot set owner to zero");

s_owner = newOwner;
    if (pendingOwner != address(0)) {
      _transferOwnership(pendingOwner);
    }
  }

/**
   * @notice Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(address to) public override onlyOwner {
    _transferOwnership(to);
  }

/**
   * @notice Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership() external override {
    require(msg.sender == s_pendingOwner, "Must be proposed owner");

address oldOwner = s_owner;
    s_owner = msg.sender;
    s_pendingOwner = address(0);

emit OwnershipTransferred(oldOwner, msg.sender);
  }

/**
   * @notice Get the current owner
   */
  function owner() public view override returns (address) {
    return s_owner;
  }

/**
   * @notice validate, transfer ownership, and emit relevant events
   */
  function _transferOwnership(address to) private {
    require(to != msg.sender, "Cannot transfer to self");

s_pendingOwner = to;

emit OwnershipTransferRequested(s_owner, to);
  }

/**
   * @notice validate access
   */
  function _validateOwnership() internal view {
    require(msg.sender == s_owner, "Only callable by owner");
  }

/**
   * @notice Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    _validateOwnership();
    _;
  }
}

// File contracts/ConfirmedOwner.sol

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwner is ConfirmedOwnerWithProposal {
  constructor(address newOwner) ConfirmedOwnerWithProposal(newOwner, address(0)) {}
}

// File contracts/interfaces/AggregatorInterface.sol

interface AggregatorInterface {
  function latestAnswer() external view returns (int256);

function latestTimestamp() external view returns (uint256);

function latestRound() external view returns (uint256);

function getAnswer(uint256 roundId) external view returns (int256);

function getTimestamp(uint256 roundId) external view returns (uint256);

event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);
  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

// File contracts/interfaces/AggregatorV3Interface.sol

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

function description() external view returns (string memory);

function version() external view returns (uint256);

// getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(uint80 _roundId)
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}

// File contracts/interfaces/AggregatorV2V3Interface.sol

interface AggregatorV2V3Interface is AggregatorInterface, AggregatorV3Interface {}

// File contracts/interfaces/AggregatorProxyInterface.sol

interface AggregatorProxyInterface is AggregatorV2V3Interface {
  function phaseAggregators(uint16 _phaseId) external view returns (address);

function phaseId() external view returns (uint16);

function proposedAggregator() external view returns (address);

function proposedGetRoundData(uint80 roundId)
    external
    view
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

function proposedLatestRoundData()
    external
    view
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

function aggregator() external view returns (address);
}

// File contracts/AggregatorProxy.sol

/**
 * @title A trusted proxy for updating where current answers are read from
 * @notice This contract provides a consistent address for the
 * CurrentAnswerInterface but delegates where it reads from to the owner, who is
 * trusted to update it.
 */
contract AggregatorProxy is AggregatorProxyInterface, ConfirmedOwner {
  struct Phase {
    uint16 id;
    AggregatorProxyInterface aggregator_;
  }
  AggregatorProxyInterface private s_proposedAggregator;
  mapping(uint16 => AggregatorProxyInterface) private s_phaseAggregators;
  Phase private s_currentPhase;

uint256 private constant PHASE_OFFSET = 64;
  uint256 private constant PHASE_SIZE = 16;
  uint256 private constant MAX_ID = 2**(PHASE_OFFSET + PHASE_SIZE) - 1;

event AggregatorProposed(address indexed current, address indexed proposed);
  event AggregatorConfirmed(address indexed previous, address indexed latest);

constructor(address aggregatorAddress) ConfirmedOwner(msg.sender) {
    setAggregator(aggregatorAddress);
  }

/**
   * @notice Reads the current answer from aggregator delegated to.
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestAnswer() public view virtual override returns (int256 answer) {
    return s_currentPhase.aggregator_.latestAnswer();
  }

/**
   * @notice Reads the last updated height from aggregator delegated to.
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestTimestamp() public view virtual override returns (uint256 updatedAt) {
    return s_currentPhase.aggregator_.latestTimestamp();
  }

/**
   * @notice get past rounds answers
   * @param roundId the answer number to retrieve the answer for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getAnswer(uint256 roundId) public view virtual override returns (int256 answer) {
    if (roundId > MAX_ID) return 0;

(uint16 _phaseId, uint64 aggregatorRoundId) = parseIds(roundId);
    AggregatorProxyInterface s_aggregator = s_phaseAggregators[_phaseId];
    if (address(s_aggregator) == address(0)) return 0;

return s_aggregator.getAnswer(aggregatorRoundId);
  }

/**
   * @notice get block timestamp when an answer was last updated
   * @param roundId the answer number to retrieve the updated timestamp for
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getTimestamp(uint256 roundId) public view virtual override returns (uint256 updatedAt) {
    if (roundId > MAX_ID) return 0;

(uint16 _phaseId, uint64 aggregatorRoundId) = parseIds(roundId);
    AggregatorProxyInterface s_aggregator = s_phaseAggregators[_phaseId];
    if (address(s_aggregator) == address(0)) return 0;

return s_aggregator.getTimestamp(aggregatorRoundId);
  }

/**
   * @notice get the latest completed round where the answer was updated. This
   * ID includes the proxy's phase, to make sure round IDs increase even when
   * switching to a newly deployed aggregator.
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestRound() public view virtual override returns (uint256 roundId) {
    Phase memory phase = s_currentPhase; // cache storage reads
    return addPhase(phase.id, uint64(phase.aggregator_.latestRound()));
  }

/**
   * @notice get data about a round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * Note that different underlying implementations of AggregatorV3Interface
   * have slightly different semantics for some of the return values. Consumers
   * should determine what implementations they expect to receive
   * data from and validate that they can properly handle return data from all
   * of them.
   * @param roundId the requested round ID as presented through the proxy, this
   * is made up of the aggregator's round ID with the phase ID encoded in the
   * two highest order bytes
   * @return id is the round ID from the aggregator for which the data was
   * retrieved combined with an phase to ensure that round IDs get larger as
   * time moves forward.
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @dev Note that answer and updatedAt may change between queries.
   */
  function getRoundData(uint80 roundId)
    public
    view
    virtual
    override
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    (uint16 _phaseId, uint64 aggregatorRoundId) = parseIds(roundId);

(id, answer, startedAt, updatedAt, answeredInRound) = s_phaseAggregators[_phaseId].getRoundData(aggregatorRoundId);

return addPhaseIds(id, answer, startedAt, updatedAt, answeredInRound, _phaseId);
  }

/**
   * @notice get data about the latest round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * Note that different underlying implementations of AggregatorV3Interface
   * have slightly different semantics for some of the return values. Consumers
   * should determine what implementations they expect to receive
   * data from and validate that they can properly handle return data from all
   * of them.
   * @return id is the round ID from the aggregator for which the data was
   * retrieved combined with an phase to ensure that round IDs get larger as
   * time moves forward.
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @dev Note that answer and updatedAt may change between queries.
   */
  function latestRoundData()
    public
    view
    virtual
    override
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    Phase memory current = s_currentPhase; // cache storage reads

(id, answer, startedAt, updatedAt, answeredInRound) = current.aggregator_.latestRoundData();

return addPhaseIds(id, answer, startedAt, updatedAt, answeredInRound, current.id);
  }

/**
   * @notice Used if an aggregator contract has been proposed.
   * @param roundId the round ID to retrieve the round data for
   * @return id is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   */
  function proposedGetRoundData(uint80 roundId)
    public
    view
    virtual
    override
    hasProposal
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return s_proposedAggregator.getRoundData(roundId);
  }

/**
   * @notice Used if an aggregator contract has been proposed.
   * @return id is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   */
  function proposedLatestRoundData()
    public
    view
    virtual
    override
    hasProposal
    returns (
      uint80 id,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return s_proposedAggregator.latestRoundData();
  }

/**
   * @notice returns the current phase's aggregator address.
   */
  function aggregator() external view override returns (address) {
    return address(s_currentPhase.aggregator_);
  }

/**
   * @notice returns the current phase's ID.
   */
  function phaseId() external view override returns (uint16) {
    return s_currentPhase.id;
  }

/**
   * @notice represents the number of decimals the aggregator responses represent.
   */
  function decimals() external view override returns (uint8) {
    return s_currentPhase.aggregator_.decimals();
  }

/**
   * @notice the version number representing the type of aggregator the proxy
   * points to.
   */
  function version() external view override returns (uint256) {
    return s_currentPhase.aggregator_.version();
  }

/**
   * @notice returns the description of the aggregator the proxy points to.
   */
  function description() external view override returns (string memory) {
    return s_currentPhase.aggregator_.description();
  }

/**
   * @notice returns the current proposed aggregator
   */
  function proposedAggregator() external view override returns (address) {
    return address(s_proposedAggregator);
  }

/**
   * @notice return a phase aggregator using the phaseId
   *
   * @param _phaseId uint16
   */
  function phaseAggregators(uint16 _phaseId) external view override returns (address) {
    return address(s_phaseAggregators[_phaseId]);
  }

/**
   * @notice Allows the owner to propose a new address for the aggregator
   * @param aggregatorAddress The new address for the aggregator contract
   */
  function proposeAggregator(address aggregatorAddress) external onlyOwner {
    s_proposedAggregator = AggregatorProxyInterface(aggregatorAddress);
    emit AggregatorProposed(address(s_currentPhase.aggregator_), aggregatorAddress);
  }

/**
   * @notice Allows the owner to confirm and change the address
   * to the proposed aggregator
   * @dev Reverts if the given address doesn't match what was previously
   * proposed
   * @param aggregatorAddress The new address for the aggregator contract
   */
  function confirmAggregator(address aggregatorAddress) external onlyOwner {
    require(aggregatorAddress == address(s_proposedAggregator), "Invalid proposed aggregator");
    address previousAggregator = address(s_currentPhase.aggregator_);
    delete s_proposedAggregator;
    setAggregator(aggregatorAddress);
    emit AggregatorConfirmed(previousAggregator, aggregatorAddress);
  }

/*
   * Internal
   */

function setAggregator(address aggregatorAddress) internal {
    uint16 id = s_currentPhase.id + 1;
    s_currentPhase = Phase(id, AggregatorProxyInterface(aggregatorAddress));
    s_phaseAggregators[id] = AggregatorProxyInterface(aggregatorAddress);
  }

function addPhase(uint16 phase, uint64 originalId) internal pure returns (uint80) {
    return uint80((uint256(phase) << PHASE_OFFSET) | originalId);
  }

function parseIds(uint256 roundId) internal pure returns (uint16, uint64) {
    uint16 _phaseId = uint16(roundId >> PHASE_OFFSET);
    uint64 aggregatorRoundId = uint64(roundId);

return (_phaseId, aggregatorRoundId);
  }

function addPhaseIds(
    uint80 roundId,
    int256 answer,
    uint256 startedAt,
    uint256 updatedAt,
    uint80 answeredInRound,
    uint16 _phaseId
  )
    internal
    pure
    returns (
      uint80,
      int256,
      uint256,
      uint256,
      uint80
    )
  {
    return (
      addPhase(_phaseId, uint64(roundId)),
      answer,
      startedAt,
      updatedAt,
      addPhase(_phaseId, uint64(answeredInRound))
    );
  }

/*
   * Modifiers
   */

modifier hasProposal() {
    require(address(s_proposedAggregator) != address(0), "No proposed aggregator present");
    _;
  }
}

// File contracts/interfaces/AccessControllerInterface.sol

interface AccessControllerInterface {
  function hasAccess(address user, bytes calldata data) external view returns (bool);
}

// File contracts/EACAggregatorProxy.sol

/**
 * @title External Access Controlled Aggregator Proxy
 * @notice A trusted proxy for updating where current answers are read from
 * @notice This contract provides a consistent address for the
 * Aggregator and AggregatorV3Interface but delegates where it reads from to the owner, who is
 * trusted to update it.
 * @notice Only access enabled addresses are allowed to access getters for
 * aggregated answers and round information.
 */
contract EACAggregatorProxy is AggregatorProxy {
  AccessControllerInterface public accessController;

constructor(address _aggregator, address _accessController) AggregatorProxy(_aggregator) {
    setController(_accessController);
  }

/**
   * @notice Allows the owner to update the accessController contract address.
   * @param _accessController The new address for the accessController contract
   */
  function setController(address _accessController) public onlyOwner {
    accessController = AccessControllerInterface(_accessController);
  }

/**
   * @notice Reads the current answer from aggregator delegated to.
   * @dev overridden function to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestAnswer() public view override checkAccess returns (int256) {
    return super.latestAnswer();
  }

/**
   * @notice get the latest completed round where the answer was updated. This
   * ID includes the proxy's phase, to make sure round IDs increase even when
   * switching to a newly deployed aggregator.
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestTimestamp() public view override checkAccess returns (uint256) {
    return super.latestTimestamp();
  }

/**
   * @notice get past rounds answers
   * @param _roundId the answer number to retrieve the answer for
   * @dev overridden function to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getAnswer(uint256 _roundId) public view override checkAccess returns (int256) {
    return super.getAnswer(_roundId);
  }

/**
   * @notice get block timestamp when an answer was last updated
   * @param _roundId the answer number to retrieve the updated timestamp for
   * @dev overridden function to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use getRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended getRoundData
   * instead which includes better verification information.
   */
  function getTimestamp(uint256 _roundId) public view override checkAccess returns (uint256) {
    return super.getTimestamp(_roundId);
  }

/**
   * @notice get the latest completed round where the answer was updated
   * @dev overridden function to add the checkAccess() modifier
   *
   * @dev #[deprecated] Use latestRoundData instead. This does not error if no
   * answer has been reached, it will simply return 0. Either wait to point to
   * an already answered Aggregator or use the recommended latestRoundData
   * instead which includes better verification information.
   */
  function latestRound() public view override checkAccess returns (uint256) {
    return super.latestRound();
  }

/**
   * @notice get data about a round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * Note that different underlying implementations of AggregatorV3Interface
   * have slightly different semantics for some of the return values. Consumers
   * should determine what implementations they expect to receive
   * data from and validate that they can properly handle return data from all
   * of them.
   * @param _roundId the round ID to retrieve the round data for
   * @return roundId is the round ID from the aggregator for which the data was
   * retrieved combined with a phase to ensure that round IDs get larger as
   * time moves forward.
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @dev Note that answer and updatedAt may change between queries.
   */
  function getRoundData(uint80 _roundId)
    public
    view
    override
    checkAccess
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.getRoundData(_roundId);
  }

/**
   * @notice get data about the latest round. Consumers are encouraged to check
   * that they're receiving fresh data by inspecting the updatedAt and
   * answeredInRound return values.
   * Note that different underlying implementations of AggregatorV3Interface
   * have slightly different semantics for some of the return values. Consumers
   * should determine what implementations they expect to receive
   * data from and validate that they can properly handle return data from all
   * of them.
   * @return roundId is the round ID from the aggregator for which the data was
   * retrieved combined with a phase to ensure that round IDs get larger as
   * time moves forward.
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @dev Note that answer and updatedAt may change between queries.
   */
  function latestRoundData()
    public
    view
    override
    checkAccess
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.latestRoundData();
  }

/**
   * @notice Used if an aggregator contract has been proposed.
   * @param _roundId the round ID to retrieve the round data for
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   */
  function proposedGetRoundData(uint80 _roundId)
    public
    view
    virtual
    override
    checkAccess
    hasProposal
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.proposedGetRoundData(_roundId);
  }

/**
   * @notice Used if an aggregator contract has been proposed.
   * @return roundId is the round ID for which data was retrieved
   * @return answer is the answer for the given round
   * @return startedAt is the timestamp when the round was started.
   * (Only some AggregatorV3Interface implementations return meaningful values)
   * @return updatedAt is the timestamp when the round last was updated (i.e.
   * answer was last computed)
   * @return answeredInRound is the round ID of the round in which the answer
   * was computed.
   */
  function proposedLatestRoundData()
    public
    view
    override
    checkAccess
    hasProposal
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    )
  {
    return super.proposedLatestRoundData();
  }

/**
   * @dev reverts if the caller does not have access by the accessController
   * contract or is the contract itself.
   */
  modifier checkAccess() {
    AccessControllerInterface ac = accessController;
    require(address(ac) == address(0) || ac.hasAccess(msg.sender, msg.data), "No access");
    _;
  }
}

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