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

import "./ConfirmedOwner.sol";
import "../interfaces/AggregatorValidatorInterface.sol";
import "../interfaces/TypeAndVersionInterface.sol";

contract ValidatorProxy is AggregatorValidatorInterface, TypeAndVersionInterface, ConfirmedOwner {

  /// @notice Uses a single storage slot to store the current address
  struct AggregatorConfiguration {
    address target;
    bool hasNewProposal;
  }

  struct ValidatorConfiguration {
    AggregatorValidatorInterface target;
    bool hasNewProposal;
  }

  // Configuration for the current aggregator
  AggregatorConfiguration private s_currentAggregator;
  // Proposed aggregator address
  address private s_proposedAggregator;

  // Configuration for the current validator
  ValidatorConfiguration private s_currentValidator;
  // Proposed validator address
  AggregatorValidatorInterface private s_proposedValidator;

  event AggregatorProposed(
    address indexed aggregator
  );
  event AggregatorUpgraded(
    address indexed previous,
    address indexed current
  );
  event ValidatorProposed(
    AggregatorValidatorInterface indexed validator
  );
  event ValidatorUpgraded(
    AggregatorValidatorInterface indexed previous,
    AggregatorValidatorInterface indexed current
  );
  /// @notice The proposed aggregator called validate, but the call was not passed on to any validators
  event ProposedAggregatorValidateCall(
    address indexed proposed,
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  );

  /**
   * @notice Construct the ValidatorProxy with an aggregator and a validator
   * @param aggregator address
   * @param validator address
   */
  constructor(
    address aggregator,
    AggregatorValidatorInterface validator
  )
    ConfirmedOwner(msg.sender)
  {
    s_currentAggregator = AggregatorConfiguration({
      target: aggregator,
      hasNewProposal: false
    });
    s_currentValidator = ValidatorConfiguration({
      target: validator,
      hasNewProposal: false
    });
  }

  /**
   * @notice Validate a transmission
   * @dev Must be called by either the `s_currentAggregator.target`, or the `s_proposedAggregator`.
   * If called by the `s_currentAggregator.target` this function passes the call on to the `s_currentValidator.target`
   * and the `s_proposedValidator`, if it is set.
   * If called by the `s_proposedAggregator` this function emits a `ProposedAggregatorValidateCall` to signal that
   * the call was received.
   * @dev To guard against external `validate` calls reverting, we use raw calls here.
   * We favour `call` over try-catch to ensure that failures are avoided even if the validator address is incorrectly
   * set as a non-contract address.
   * @dev If the `aggregator` and `validator` are the same contract or collude, this could exhibit reentrancy behavior.
   * However, since that contract would have to be explicitly written for reentrancy and that the `owner` would have
   * to configure this contract to use that malicious contract, we refrain from using mutex or check here.
   * @dev This does not perform any checks on any roundId, so it is possible that a validator receive different reports
   * for the same roundId at different points in time. Validator implementations should be aware of this.
   * @param previousRoundId uint256
   * @param previousAnswer int256
   * @param currentRoundId uint256
   * @param currentAnswer int256
   * @return bool
   */
  function validate(
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  )
    external
    override
    returns (
      bool
    )
  {
    address currentAggregator = s_currentAggregator.target;
    if (msg.sender != currentAggregator) {
      address proposedAggregator = s_proposedAggregator;
      require(msg.sender == proposedAggregator, "Not a configured aggregator");
      // If the aggregator is still in proposed state, emit an event and don't push to any validator.
      // This is to confirm that `validate` is being called prior to upgrade.
      emit ProposedAggregatorValidateCall(
        proposedAggregator,
        previousRoundId,
        previousAnswer,
        currentRoundId,
        currentAnswer
      );
      return true;
    }

    // Send the validate call to the current validator
    ValidatorConfiguration memory currentValidator = s_currentValidator;
    address currentValidatorAddress = address(currentValidator.target);
    require(currentValidatorAddress != address(0), "No validator set");
    currentValidatorAddress.call(
      abi.encodeWithSelector(
        AggregatorValidatorInterface.validate.selector,
        previousRoundId,
        previousAnswer,
        currentRoundId,
        currentAnswer
      )
    );
    // If there is a new proposed validator, send the validate call to that validator also
    if (currentValidator.hasNewProposal) {
      address(s_proposedValidator).call(
        abi.encodeWithSelector(
          AggregatorValidatorInterface.validate.selector,
          previousRoundId,
          previousAnswer,
          currentRoundId,
          currentAnswer
        )
      );
    }
    return true;
  }

  /** AGGREGATOR CONFIGURATION FUNCTIONS **/

  /**
   * @notice Propose an aggregator
   * @dev A zero address can be used to unset the proposed aggregator. Only owner can call.
   * @param proposed address
   */
  function proposeNewAggregator(
    address proposed
  )
    external
    onlyOwner()
  {
    require(s_proposedAggregator != proposed && s_currentAggregator.target != proposed, "Invalid proposal");
    s_proposedAggregator = proposed;
    // If proposed is zero address, hasNewProposal = false
    s_currentAggregator.hasNewProposal = (proposed != address(0));
    emit AggregatorProposed(proposed);
  }

  /**
   * @notice Upgrade the aggregator by setting the current aggregator as the proposed aggregator.
   * @dev Must have a proposed aggregator. Only owner can call.
   */
  function upgradeAggregator()
    external
    onlyOwner()
  {
    // Get configuration in memory
    AggregatorConfiguration memory current = s_currentAggregator;
    address previous = current.target;
    address proposed = s_proposedAggregator;

    // Perform the upgrade
    require(current.hasNewProposal, "No proposal");
    s_currentAggregator = AggregatorConfiguration({
      target: proposed,
      hasNewProposal: false
    });
    delete s_proposedAggregator;

    emit AggregatorUpgraded(previous, proposed);
  }

  /**
   * @notice Get aggregator details
   * @return current address
   * @return hasProposal bool
   * @return proposed address
   */
  function getAggregators()
    external
    view
    returns(
      address current,
      bool hasProposal,
      address proposed
    )
  {
    current = s_currentAggregator.target;
    hasProposal = s_currentAggregator.hasNewProposal;
    proposed = s_proposedAggregator;
  }

  /** VALIDATOR CONFIGURATION FUNCTIONS **/

  /**
   * @notice Propose an validator
   * @dev A zero address can be used to unset the proposed validator. Only owner can call.
   * @param proposed address
   */
  function proposeNewValidator(
    AggregatorValidatorInterface proposed
  )
    external
    onlyOwner()
  {
    require(s_proposedValidator != proposed && s_currentValidator.target != proposed, "Invalid proposal");
    s_proposedValidator = proposed;
    // If proposed is zero address, hasNewProposal = false
    s_currentValidator.hasNewProposal = (address(proposed) != address(0));
    emit ValidatorProposed(proposed);
  }

  /**
   * @notice Upgrade the validator by setting the current validator as the proposed validator.
   * @dev Must have a proposed validator. Only owner can call.
   */
  function upgradeValidator()
    external
    onlyOwner()
  {
    // Get configuration in memory
    ValidatorConfiguration memory current = s_currentValidator;
    AggregatorValidatorInterface previous = current.target;
    AggregatorValidatorInterface proposed = s_proposedValidator;

    // Perform the upgrade
    require(current.hasNewProposal, "No proposal");
    s_currentValidator = ValidatorConfiguration({
      target: proposed,
      hasNewProposal: false
    });
    delete s_proposedValidator;

    emit ValidatorUpgraded(previous, proposed);
  }

  /**
   * @notice Get validator details
   * @return current address
   * @return hasProposal bool
   * @return proposed address
   */
  function getValidators()
    external
    view
    returns(
      AggregatorValidatorInterface current,
      bool hasProposal,
      AggregatorValidatorInterface proposed
    )
  {
    current = s_currentValidator.target;
    hasProposal = s_currentValidator.hasNewProposal;
    proposed = s_proposedValidator;
  }

  /**
   * @notice The type and version of this contract
   * @return Type and version string
   */
  function typeAndVersion()
    external
    pure
    virtual
    override
    returns (
      string memory
    )
  {
    return "ValidatorProxy 1.0.0";
  }

}

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

/**
 * @title The ConfirmedOwner contract
 * @notice A contract with helpers for basic contract ownership.
 */
contract ConfirmedOwner {

  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) {
    s_owner = newOwner;
  }

  /**
   * @notice Allows an owner to begin transferring ownership to a new address,
   * pending.
   */
  function transferOwnership(
    address to
  )
    external
    onlyOwner()
  {
    require(to != msg.sender, "Cannot transfer to self");

    s_pendingOwner = to;

    emit OwnershipTransferRequested(s_owner, to);
  }

  /**
   * @notice Allows an ownership transfer to be completed by the recipient.
   */
  function acceptOwnership()
    external
  {
    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
    returns (
      address
    )
  {
    return s_owner;
  }

  /**
   * @notice Reverts if called by anyone other than the contract owner.
   */
  modifier onlyOwner() {
    require(msg.sender == s_owner, "Only callable by owner");
    _;
  }

}

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

interface AggregatorValidatorInterface {
  function validate(
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  )
    external
    returns (
      bool
    );
}

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

abstract contract TypeAndVersionInterface{
  function typeAndVersion()
    external
    pure
    virtual
    returns (
      string memory
    );
}

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

import "../interfaces/AggregatorValidatorInterface.sol";

contract MockAggregatorValidator is AggregatorValidatorInterface {
  
  uint8 immutable id;

  constructor(uint8 id_) {
    id = id_;
  }

  event ValidateCalled(
    uint8 id,
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  );
  
  function validate(
    uint256 previousRoundId,
    int256 previousAnswer,
    uint256 currentRoundId,
    int256 currentAnswer
  )
    external
    override
    returns (
      bool
    )
  {
    emit ValidateCalled(id, previousRoundId, previousAnswer, currentRoundId, currentAnswer);
    return true;
  }

}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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00000000000000000000000037bc7498f4ff12c19678ee8fe19d713b87f6a9e60000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : aggregator (address): 0x37bC7498f4FF12C19678ee8fE19d713b87F6a9e6
Arg [1] : validator (address): 0x0000000000000000000000000000000000000000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000037bc7498f4ff12c19678ee8fe19d713b87f6a9e6
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000