// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../IIntegrationAdapter.sol";
import "./IntegrationSelectors.sol";

/// @title AdapterBase Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A base contract for integration adapters
abstract contract AdapterBase is IIntegrationAdapter, IntegrationSelectors {
    using SafeERC20 for ERC20;

    address internal immutable INTEGRATION_MANAGER;

    /// @dev Provides a standard implementation for transferring assets between
    /// the fund's VaultProxy and the adapter, by wrapping the adapter action.
    /// This modifier should be implemented in almost all adapter actions, unless they
    /// do not move assets or can spend and receive assets directly with the VaultProxy
    modifier fundAssetsTransferHandler(
        address _vaultProxy,
        bytes memory _encodedAssetTransferArgs
    ) {
        (
            IIntegrationManager.SpendAssetsHandleType spendAssetsHandleType,
            address[] memory spendAssets,
            uint256[] memory spendAssetAmounts,
            address[] memory incomingAssets
        ) = __decodeEncodedAssetTransferArgs(_encodedAssetTransferArgs);

        // Take custody of spend assets (if necessary)
        if (spendAssetsHandleType == IIntegrationManager.SpendAssetsHandleType.Approve) {
            for (uint256 i = 0; i < spendAssets.length; i++) {
                ERC20(spendAssets[i]).safeTransferFrom(
                    _vaultProxy,
                    address(this),
                    spendAssetAmounts[i]
                );
            }
        }

        // Execute call
        _;

        // Transfer remaining assets back to the fund's VaultProxy
        __transferContractAssetBalancesToFund(_vaultProxy, incomingAssets);
        __transferContractAssetBalancesToFund(_vaultProxy, spendAssets);
    }

    modifier onlyIntegrationManager {
        require(
            msg.sender == INTEGRATION_MANAGER,
            "Only the IntegrationManager can call this function"
        );
        _;
    }

    constructor(address _integrationManager) public {
        INTEGRATION_MANAGER = _integrationManager;
    }

    // INTERNAL FUNCTIONS

    /// @dev Helper for adapters to approve their integratees with the max amount of an asset.
    /// Since everything is done atomically, and only the balances to-be-used are sent to adapters,
    /// there is no need to approve exact amounts on every call.
    function __approveMaxAsNeeded(
        address _asset,
        address _target,
        uint256 _neededAmount
    ) internal {
        if (ERC20(_asset).allowance(address(this), _target) < _neededAmount) {
            ERC20(_asset).approve(_target, type(uint256).max);
        }
    }

    /// @dev Helper to decode the _encodedAssetTransferArgs param passed to adapter call
    function __decodeEncodedAssetTransferArgs(bytes memory _encodedAssetTransferArgs)
        internal
        pure
        returns (
            IIntegrationManager.SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory spendAssetAmounts_,
            address[] memory incomingAssets_
        )
    {
        return
            abi.decode(
                _encodedAssetTransferArgs,
                (IIntegrationManager.SpendAssetsHandleType, address[], uint256[], address[])
            );
    }

    /// @dev Helper to transfer full contract balances of assets to the specified VaultProxy
    function __transferContractAssetBalancesToFund(address _vaultProxy, address[] memory _assets)
        private
    {
        for (uint256 i = 0; i < _assets.length; i++) {
            uint256 postCallAmount = ERC20(_assets[i]).balanceOf(address(this));
            if (postCallAmount > 0) {
                ERC20(_assets[i]).safeTransfer(_vaultProxy, postCallAmount);
            }
        }
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `INTEGRATION_MANAGER` variable
    /// @return integrationManager_ The `INTEGRATION_MANAGER` variable value
    function getIntegrationManager() external view returns (address integrationManager_) {
        return INTEGRATION_MANAGER;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../utils/AddressListPolicyMixin.sol";
import "./utils/PreCallOnIntegrationValidatePolicyBase.sol";

/// @title AdapterBlacklist Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A policy that disallows a configurable blacklist of adapters from use by a fund
contract AdapterBlacklist is PreCallOnIntegrationValidatePolicyBase, AddressListPolicyMixin {
    constructor(address _policyManager) public PolicyBase(_policyManager) {}

    /// @notice Add the initial policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function addFundSettings(address _comptrollerProxy, bytes calldata _encodedSettings)
        external
        override
        onlyPolicyManager
    {
        __addToList(_comptrollerProxy, abi.decode(_encodedSettings, (address[])));
    }

    /// @notice Provides a constant string identifier for a policy
    /// @return identifier_ The identifer string
    function identifier() external pure override returns (string memory identifier_) {
        return "ADAPTER_BLACKLIST";
    }

    /// @notice Checks whether a particular condition passes the rule for a particular fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _adapter The adapter with which to check the rule
    /// @return isValid_ True if the rule passes
    function passesRule(address _comptrollerProxy, address _adapter)
        public
        view
        returns (bool isValid_)
    {
        return !isInList(_comptrollerProxy, _adapter);
    }

    /// @notice Apply the rule with the specified parameters of a PolicyHook
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedArgs Encoded args with which to validate the rule
    /// @return isValid_ True if the rule passes
    function validateRule(
        address _comptrollerProxy,
        address,
        IPolicyManager.PolicyHook,
        bytes calldata _encodedArgs
    ) external override returns (bool isValid_) {
        (address adapter, ) = __decodeRuleArgs(_encodedArgs);

        return passesRule(_comptrollerProxy, adapter);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../utils/AddressListPolicyMixin.sol";
import "./utils/PreCallOnIntegrationValidatePolicyBase.sol";

/// @title AdapterWhitelist Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A policy that only allows a configurable whitelist of adapters for use by a fund
contract AdapterWhitelist is PreCallOnIntegrationValidatePolicyBase, AddressListPolicyMixin {
    constructor(address _policyManager) public PolicyBase(_policyManager) {}

    /// @notice Add the initial policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function addFundSettings(address _comptrollerProxy, bytes calldata _encodedSettings)
        external
        override
        onlyPolicyManager
    {
        __addToList(_comptrollerProxy, abi.decode(_encodedSettings, (address[])));
    }

    /// @notice Provides a constant string identifier for a policy
    /// @return identifier_ The identifer string
    function identifier() external pure override returns (string memory identifier_) {
        return "ADAPTER_WHITELIST";
    }

    /// @notice Checks whether a particular condition passes the rule for a particular fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _adapter The adapter with which to check the rule
    /// @return isValid_ True if the rule passes
    function passesRule(address _comptrollerProxy, address _adapter)
        public
        view
        returns (bool isValid_)
    {
        return isInList(_comptrollerProxy, _adapter);
    }

    /// @notice Apply the rule with the specified parameters of a PolicyHook
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedArgs Encoded args with which to validate the rule
    /// @return isValid_ True if the rule passes
    function validateRule(
        address _comptrollerProxy,
        address,
        IPolicyManager.PolicyHook,
        bytes calldata _encodedArgs
    ) external override returns (bool isValid_) {
        (address adapter, ) = __decodeRuleArgs(_encodedArgs);

        return passesRule(_comptrollerProxy, adapter);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.2;

/**
 * @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) {
        // This method relies in extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @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");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

/// @title AddressArray Library
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A library to extend the address array data type
library AddressArrayLib {
    /// @dev Helper to verify if an array contains a particular value
    function contains(address[] memory _self, address _target)
        internal
        pure
        returns (bool doesContain_)
    {
        for (uint256 i; i < _self.length; i++) {
            if (_target == _self[i]) {
                return true;
            }
        }
        return false;
    }

    /// @dev Helper to verify if array is a set of unique values.
    /// Does not assert length > 0.
    function isUniqueSet(address[] memory _self) internal pure returns (bool isUnique_) {
        if (_self.length <= 1) {
            return true;
        }

        uint256 arrayLength = _self.length;
        for (uint256 i; i < arrayLength; i++) {
            for (uint256 j = i + 1; j < arrayLength; j++) {
                if (_self[i] == _self[j]) {
                    return false;
                }
            }
        }

        return true;
    }

    /// @dev Helper to remove items from an array. Removes all matching occurrences of each item.
    /// Does not assert uniqueness of either array.
    function removeItems(address[] memory _self, address[] memory _itemsToRemove)
        internal
        pure
        returns (address[] memory nextArray_)
    {
        if (_itemsToRemove.length == 0) {
            return _self;
        }

        bool[] memory indexesToRemove = new bool[](_self.length);
        uint256 remainingItemsCount = _self.length;
        for (uint256 i; i < _self.length; i++) {
            if (contains(_itemsToRemove, _self[i])) {
                indexesToRemove[i] = true;
                remainingItemsCount--;
            }
        }

        if (remainingItemsCount == _self.length) {
            nextArray_ = _self;
        } else if (remainingItemsCount > 0) {
            nextArray_ = new address[](remainingItemsCount);
            uint256 nextArrayIndex;
            for (uint256 i; i < _self.length; i++) {
                if (!indexesToRemove[i]) {
                    nextArray_[nextArrayIndex] = _self[i];
                    nextArrayIndex++;
                }
            }
        }

        return nextArray_;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/utils/EnumerableSet.sol";

/// @title AddressListPolicyMixin Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice An abstract mixin contract for policies that use an address list
abstract contract AddressListPolicyMixin {
    using EnumerableSet for EnumerableSet.AddressSet;

    event AddressesAdded(address indexed comptrollerProxy, address[] items);

    event AddressesRemoved(address indexed comptrollerProxy, address[] items);

    mapping(address => EnumerableSet.AddressSet) private comptrollerProxyToList;

    // EXTERNAL FUNCTIONS

    /// @notice Get all addresses in a fund's list
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @return list_ The addresses in the fund's list
    function getList(address _comptrollerProxy) external view returns (address[] memory list_) {
        list_ = new address[](comptrollerProxyToList[_comptrollerProxy].length());
        for (uint256 i = 0; i < list_.length; i++) {
            list_[i] = comptrollerProxyToList[_comptrollerProxy].at(i);
        }
        return list_;
    }

    // PUBLIC FUNCTIONS

    /// @notice Check if an address is in a fund's list
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _item The address to check against the list
    /// @return isInList_ True if the address is in the list
    function isInList(address _comptrollerProxy, address _item)
        public
        view
        returns (bool isInList_)
    {
        return comptrollerProxyToList[_comptrollerProxy].contains(_item);
    }

    // INTERNAL FUNCTIONS

    /// @dev Helper to add addresses to the calling fund's list
    function __addToList(address _comptrollerProxy, address[] memory _items) internal {
        require(_items.length > 0, "__addToList: No addresses provided");

        for (uint256 i = 0; i < _items.length; i++) {
            require(
                comptrollerProxyToList[_comptrollerProxy].add(_items[i]),
                "__addToList: Address already exists in list"
            );
        }

        emit AddressesAdded(_comptrollerProxy, _items);
    }

    /// @dev Helper to remove addresses from the calling fund's list
    function __removeFromList(address _comptrollerProxy, address[] memory _items) internal {
        require(_items.length > 0, "__removeFromList: No addresses provided");

        for (uint256 i = 0; i < _items.length; i++) {
            require(
                comptrollerProxyToList[_comptrollerProxy].remove(_items[i]),
                "__removeFromList: Address does not exist in list"
            );
        }

        emit AddressesRemoved(_comptrollerProxy, _items);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../utils/DispatcherOwnerMixin.sol";
import "./IAggregatedDerivativePriceFeed.sol";

/// @title AggregatedDerivativePriceFeed Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Aggregates multiple derivative price feeds (e.g., Compound, Chai) and dispatches
/// rate requests to the appropriate feed
contract AggregatedDerivativePriceFeed is IAggregatedDerivativePriceFeed, DispatcherOwnerMixin {
    event DerivativeAdded(address indexed derivative, address priceFeed);

    event DerivativeRemoved(address indexed derivative);

    event DerivativeUpdated(
        address indexed derivative,
        address prevPriceFeed,
        address nextPriceFeed
    );

    mapping(address => address) private derivativeToPriceFeed;

    constructor(
        address _dispatcher,
        address[] memory _derivatives,
        address[] memory _priceFeeds
    ) public DispatcherOwnerMixin(_dispatcher) {
        if (_derivatives.length > 0) {
            __addDerivatives(_derivatives, _priceFeeds);
        }
    }

    /// @notice Gets the rates for 1 unit of the derivative to its underlying assets
    /// @param _derivative The derivative for which to get the rates
    /// @return underlyings_ The underlying assets for the _derivative
    /// @return underlyingAmounts_ The rates for the _derivative to the underlyings_
    function calcUnderlyingValues(address _derivative, uint256 _derivativeAmount)
        external
        override
        returns (address[] memory underlyings_, uint256[] memory underlyingAmounts_)
    {
        address derivativePriceFeed = derivativeToPriceFeed[_derivative];
        require(
            derivativePriceFeed != address(0),
            "calcUnderlyingValues: _derivative is not supported"
        );

        return
            IDerivativePriceFeed(derivativePriceFeed).calcUnderlyingValues(
                _derivative,
                _derivativeAmount
            );
    }

    /// @notice Checks whether an asset is a supported derivative
    /// @param _asset The asset to check
    /// @return isSupported_ True if the asset is a supported derivative
    /// @dev This should be as low-cost and simple as possible
    function isSupportedAsset(address _asset) external view override returns (bool isSupported_) {
        return derivativeToPriceFeed[_asset] != address(0);
    }

    //////////////////////////
    // DERIVATIVES REGISTRY //
    //////////////////////////

    /// @notice Adds a list of derivatives with the given price feed values
    /// @param _derivatives The derivatives to add
    /// @param _priceFeeds The ordered price feeds corresponding to the list of _derivatives
    function addDerivatives(address[] calldata _derivatives, address[] calldata _priceFeeds)
        external
        onlyDispatcherOwner
    {
        require(_derivatives.length > 0, "addDerivatives: _derivatives cannot be empty");

        __addDerivatives(_derivatives, _priceFeeds);
    }

    /// @notice Removes a list of derivatives
    /// @param _derivatives The derivatives to remove
    function removeDerivatives(address[] calldata _derivatives) external onlyDispatcherOwner {
        require(_derivatives.length > 0, "removeDerivatives: _derivatives cannot be empty");

        for (uint256 i = 0; i < _derivatives.length; i++) {
            require(
                derivativeToPriceFeed[_derivatives[i]] != address(0),
                "removeDerivatives: Derivative not yet added"
            );

            delete derivativeToPriceFeed[_derivatives[i]];

            emit DerivativeRemoved(_derivatives[i]);
        }
    }

    /// @notice Updates a list of derivatives with the given price feed values
    /// @param _derivatives The derivatives to update
    /// @param _priceFeeds The ordered price feeds corresponding to the list of _derivatives
    function updateDerivatives(address[] calldata _derivatives, address[] calldata _priceFeeds)
        external
        onlyDispatcherOwner
    {
        require(_derivatives.length > 0, "updateDerivatives: _derivatives cannot be empty");
        require(
            _derivatives.length == _priceFeeds.length,
            "updateDerivatives: Unequal _derivatives and _priceFeeds array lengths"
        );

        for (uint256 i = 0; i < _derivatives.length; i++) {
            address prevPriceFeed = derivativeToPriceFeed[_derivatives[i]];

            require(prevPriceFeed != address(0), "updateDerivatives: Derivative not yet added");
            require(_priceFeeds[i] != prevPriceFeed, "updateDerivatives: Value already set");

            __validateDerivativePriceFeed(_derivatives[i], _priceFeeds[i]);

            derivativeToPriceFeed[_derivatives[i]] = _priceFeeds[i];

            emit DerivativeUpdated(_derivatives[i], prevPriceFeed, _priceFeeds[i]);
        }
    }

    /// @dev Helper to add derivative-feed pairs
    function __addDerivatives(address[] memory _derivatives, address[] memory _priceFeeds)
        private
    {
        require(
            _derivatives.length == _priceFeeds.length,
            "__addDerivatives: Unequal _derivatives and _priceFeeds array lengths"
        );

        for (uint256 i = 0; i < _derivatives.length; i++) {
            require(
                derivativeToPriceFeed[_derivatives[i]] == address(0),
                "__addDerivatives: Already added"
            );

            __validateDerivativePriceFeed(_derivatives[i], _priceFeeds[i]);

            derivativeToPriceFeed[_derivatives[i]] = _priceFeeds[i];

            emit DerivativeAdded(_derivatives[i], _priceFeeds[i]);
        }
    }

    /// @dev Helper to validate a derivative price feed
    function __validateDerivativePriceFeed(address _derivative, address _priceFeed) private view {
        require(_derivative != address(0), "__validateDerivativePriceFeed: Empty _derivative");
        require(_priceFeed != address(0), "__validateDerivativePriceFeed: Empty _priceFeed");
        require(
            IDerivativePriceFeed(_priceFeed).isSupportedAsset(_derivative),
            "__validateDerivativePriceFeed: Unsupported derivative"
        );
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the registered price feed for a given derivative
    /// @return priceFeed_ The price feed contract address
    function getPriceFeedForDerivative(address _derivative)
        external
        view
        override
        returns (address priceFeed_)
    {
        return derivativeToPriceFeed[_derivative];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../../core/fund/comptroller/ComptrollerLib.sol";
import "../../../../core/fund/vault/VaultLib.sol";
import "../../../../utils/AddressArrayLib.sol";
import "../utils/AddressListPolicyMixin.sol";
import "./utils/PostCallOnIntegrationValidatePolicyBase.sol";

/// @title AssetBlacklist Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A policy that disallows a configurable blacklist of assets in a fund's holdings
contract AssetBlacklist is PostCallOnIntegrationValidatePolicyBase, AddressListPolicyMixin {
    using AddressArrayLib for address[];

    constructor(address _policyManager) public PolicyBase(_policyManager) {}

    /// @notice Validates and initializes a policy as necessary prior to fund activation
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _vaultProxy The fund's VaultProxy address
    function activateForFund(address _comptrollerProxy, address _vaultProxy)
        external
        override
        onlyPolicyManager
    {
        require(
            passesRule(_comptrollerProxy, VaultLib(_vaultProxy).getTrackedAssets()),
            "activateForFund: Blacklisted asset detected"
        );
    }

    /// @notice Add the initial policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function addFundSettings(address _comptrollerProxy, bytes calldata _encodedSettings)
        external
        override
        onlyPolicyManager
    {
        address[] memory assets = abi.decode(_encodedSettings, (address[]));
        require(
            !assets.contains(ComptrollerLib(_comptrollerProxy).getDenominationAsset()),
            "addFundSettings: Cannot blacklist denominationAsset"
        );

        __addToList(_comptrollerProxy, assets);
    }

    /// @notice Provides a constant string identifier for a policy
    /// @return identifier_ The identifer string
    function identifier() external pure override returns (string memory identifier_) {
        return "ASSET_BLACKLIST";
    }

    /// @notice Checks whether a particular condition passes the rule for a particular fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _assets The assets with which to check the rule
    /// @return isValid_ True if the rule passes
    function passesRule(address _comptrollerProxy, address[] memory _assets)
        public
        view
        returns (bool isValid_)
    {
        for (uint256 i; i < _assets.length; i++) {
            if (isInList(_comptrollerProxy, _assets[i])) {
                return false;
            }
        }

        return true;
    }

    /// @notice Apply the rule with the specified parameters of a PolicyHook
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedArgs Encoded args with which to validate the rule
    /// @return isValid_ True if the rule passes
    function validateRule(
        address _comptrollerProxy,
        address,
        IPolicyManager.PolicyHook,
        bytes calldata _encodedArgs
    ) external override returns (bool isValid_) {
        (, , address[] memory incomingAssets, , , ) = __decodeRuleArgs(_encodedArgs);

        return passesRule(_comptrollerProxy, incomingAssets);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../infrastructure/price-feeds/derivatives/feeds/SynthetixPriceFeed.sol";
import "../interfaces/ISynthetixAddressResolver.sol";
import "../interfaces/ISynthetixExchanger.sol";

/// @title AssetFinalityResolver Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A contract that helps achieve asset finality
abstract contract AssetFinalityResolver {
    address internal immutable SYNTHETIX_ADDRESS_RESOLVER;
    address internal immutable SYNTHETIX_PRICE_FEED;

    constructor(address _synthetixPriceFeed, address _synthetixAddressResolver) public {
        SYNTHETIX_ADDRESS_RESOLVER = _synthetixAddressResolver;
        SYNTHETIX_PRICE_FEED = _synthetixPriceFeed;
    }

    /// @dev Helper to finalize a Synth balance at a given target address and return its balance
    function __finalizeIfSynthAndGetAssetBalance(
        address _target,
        address _asset,
        bool _requireFinality
    ) internal returns (uint256 assetBalance_) {
        bytes32 currencyKey = SynthetixPriceFeed(SYNTHETIX_PRICE_FEED).getCurrencyKeyForSynth(
            _asset
        );
        if (currencyKey != 0) {
            address synthetixExchanger = ISynthetixAddressResolver(SYNTHETIX_ADDRESS_RESOLVER)
                .requireAndGetAddress(
                "Exchanger",
                "finalizeAndGetAssetBalance: Missing Exchanger"
            );
            try ISynthetixExchanger(synthetixExchanger).settle(_target, currencyKey)  {} catch {
                require(!_requireFinality, "finalizeAndGetAssetBalance: Cannot settle Synth");
            }
        }

        return ERC20(_asset).balanceOf(_target);
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `SYNTHETIX_ADDRESS_RESOLVER` variable
    /// @return synthetixAddressResolver_ The `SYNTHETIX_ADDRESS_RESOLVER` variable value
    function getSynthetixAddressResolver()
        external
        view
        returns (address synthetixAddressResolver_)
    {
        return SYNTHETIX_ADDRESS_RESOLVER;
    }

    /// @notice Gets the `SYNTHETIX_PRICE_FEED` variable
    /// @return synthetixPriceFeed_ The `SYNTHETIX_PRICE_FEED` variable value
    function getSynthetixPriceFeed() external view returns (address synthetixPriceFeed_) {
        return SYNTHETIX_PRICE_FEED;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../../core/fund/comptroller/ComptrollerLib.sol";
import "../../../../core/fund/vault/VaultLib.sol";
import "../../../../utils/AddressArrayLib.sol";
import "../utils/AddressListPolicyMixin.sol";
import "./utils/PostCallOnIntegrationValidatePolicyBase.sol";

/// @title AssetWhitelist Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A policy that only allows a configurable whitelist of assets in a fund's holdings
contract AssetWhitelist is PostCallOnIntegrationValidatePolicyBase, AddressListPolicyMixin {
    using AddressArrayLib for address[];

    constructor(address _policyManager) public PolicyBase(_policyManager) {}

    /// @notice Validates and initializes a policy as necessary prior to fund activation
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _vaultProxy The fund's VaultProxy address
    function activateForFund(address _comptrollerProxy, address _vaultProxy)
        external
        override
        onlyPolicyManager
    {
        require(
            passesRule(_comptrollerProxy, VaultLib(_vaultProxy).getTrackedAssets()),
            "activateForFund: Non-whitelisted asset detected"
        );
    }

    /// @notice Add the initial policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function addFundSettings(address _comptrollerProxy, bytes calldata _encodedSettings)
        external
        override
        onlyPolicyManager
    {
        address[] memory assets = abi.decode(_encodedSettings, (address[]));
        require(
            assets.contains(ComptrollerLib(_comptrollerProxy).getDenominationAsset()),
            "addFundSettings: Must whitelist denominationAsset"
        );

        __addToList(_comptrollerProxy, abi.decode(_encodedSettings, (address[])));
    }

    /// @notice Provides a constant string identifier for a policy
    /// @return identifier_ The identifer string
    function identifier() external pure override returns (string memory identifier_) {
        return "ASSET_WHITELIST";
    }

    /// @notice Checks whether a particular condition passes the rule for a particular fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _assets The assets with which to check the rule
    /// @return isValid_ True if the rule passes
    function passesRule(address _comptrollerProxy, address[] memory _assets)
        public
        view
        returns (bool isValid_)
    {
        for (uint256 i; i < _assets.length; i++) {
            if (!isInList(_comptrollerProxy, _assets[i])) {
                return false;
            }
        }

        return true;
    }

    /// @notice Apply the rule with the specified parameters of a PolicyHook
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedArgs Encoded args with which to validate the rule
    /// @return isValid_ True if the rule passes
    function validateRule(
        address _comptrollerProxy,
        address,
        IPolicyManager.PolicyHook,
        bytes calldata _encodedArgs
    ) external override returns (bool isValid_) {
        (, , address[] memory incomingAssets, , , ) = __decodeRuleArgs(_encodedArgs);

        return passesRule(_comptrollerProxy, incomingAssets);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../core/fund/comptroller/ComptrollerLib.sol";
import "../../core/fund/vault/VaultLib.sol";
import "./AuthUserExecutedSharesRequestorProxy.sol";
import "./IAuthUserExecutedSharesRequestor.sol";

/// @title AuthUserExecutedSharesRequestorFactory Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Deploys and maintains a record of AuthUserExecutedSharesRequestorProxy instances
contract AuthUserExecutedSharesRequestorFactory {
    event SharesRequestorProxyDeployed(
        address indexed comptrollerProxy,
        address sharesRequestorProxy
    );

    address private immutable AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB;
    address private immutable DISPATCHER;

    mapping(address => address) private comptrollerProxyToSharesRequestorProxy;

    constructor(address _dispatcher, address _authUserExecutedSharesRequestorLib) public {
        AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB = _authUserExecutedSharesRequestorLib;
        DISPATCHER = _dispatcher;
    }

    /// @notice Deploys a shares requestor proxy instance for a given ComptrollerProxy instance
    /// @param _comptrollerProxy The ComptrollerProxy for which to deploy the shares requestor proxy
    /// @return sharesRequestorProxy_ The address of the newly-deployed shares requestor proxy
    function deploySharesRequestorProxy(address _comptrollerProxy)
        external
        returns (address sharesRequestorProxy_)
    {
        // Confirm fund is genuine
        VaultLib vaultProxyContract = VaultLib(ComptrollerLib(_comptrollerProxy).getVaultProxy());
        require(
            vaultProxyContract.getAccessor() == _comptrollerProxy,
            "deploySharesRequestorProxy: Invalid VaultProxy for ComptrollerProxy"
        );
        require(
            IDispatcher(DISPATCHER).getFundDeployerForVaultProxy(address(vaultProxyContract)) !=
                address(0),
            "deploySharesRequestorProxy: Not a genuine fund"
        );

        // Validate that the caller is the fund owner
        require(
            msg.sender == vaultProxyContract.getOwner(),
            "deploySharesRequestorProxy: Only fund owner callable"
        );

        // Validate that a proxy does not already exist
        require(
            comptrollerProxyToSharesRequestorProxy[_comptrollerProxy] == address(0),
            "deploySharesRequestorProxy: Proxy already exists"
        );

        // Deploy the proxy
        bytes memory constructData = abi.encodeWithSelector(
            IAuthUserExecutedSharesRequestor.init.selector,
            _comptrollerProxy
        );
        sharesRequestorProxy_ = address(
            new AuthUserExecutedSharesRequestorProxy(
                constructData,
                AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB
            )
        );

        comptrollerProxyToSharesRequestorProxy[_comptrollerProxy] = sharesRequestorProxy_;

        emit SharesRequestorProxyDeployed(_comptrollerProxy, sharesRequestorProxy_);

        return sharesRequestorProxy_;
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the value of the `AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB` variable
    /// @return authUserExecutedSharesRequestorLib_ The `AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB` variable value
    function getAuthUserExecutedSharesRequestorLib()
        external
        view
        returns (address authUserExecutedSharesRequestorLib_)
    {
        return AUTH_USER_EXECUTED_SHARES_REQUESTOR_LIB;
    }

    /// @notice Gets the value of the `DISPATCHER` variable
    /// @return dispatcher_ The `DISPATCHER` variable value
    function getDispatcher() external view returns (address dispatcher_) {
        return DISPATCHER;
    }

    /// @notice Gets the AuthUserExecutedSharesRequestorProxy associated with the given ComptrollerProxy
    /// @param _comptrollerProxy The ComptrollerProxy for which to get the associated AuthUserExecutedSharesRequestorProxy
    /// @return sharesRequestorProxy_ The associated AuthUserExecutedSharesRequestorProxy address
    function getSharesRequestorProxyForComptrollerProxy(address _comptrollerProxy)
        external
        view
        returns (address sharesRequestorProxy_)
    {
        return comptrollerProxyToSharesRequestorProxy[_comptrollerProxy];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../../core/fund/comptroller/ComptrollerLib.sol";
import "../../core/fund/vault/VaultLib.sol";
import "./IAuthUserExecutedSharesRequestor.sol";

/// @title AuthUserExecutedSharesRequestorLib Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Provides the logic for AuthUserExecutedSharesRequestorProxy instances,
/// in which shares requests are manually executed by a permissioned user
/// @dev This will not work with a `denominationAsset` that does not transfer
/// the exact expected amount or has an elastic supply.
contract AuthUserExecutedSharesRequestorLib is IAuthUserExecutedSharesRequestor {
    using SafeERC20 for ERC20;
    using SafeMath for uint256;

    event RequestCanceled(
        address indexed requestOwner,
        uint256 investmentAmount,
        uint256 minSharesQuantity
    );

    event RequestCreated(
        address indexed requestOwner,
        uint256 investmentAmount,
        uint256 minSharesQuantity
    );

    event RequestExecuted(
        address indexed caller,
        address indexed requestOwner,
        uint256 investmentAmount,
        uint256 minSharesQuantity
    );

    event RequestExecutorAdded(address indexed account);

    event RequestExecutorRemoved(address indexed account);

    struct RequestInfo {
        uint256 investmentAmount;
        uint256 minSharesQuantity;
    }

    uint256 private constant CANCELLATION_COOLDOWN_TIMELOCK = 10 minutes;

    address private comptrollerProxy;
    address private denominationAsset;
    address private fundOwner;

    mapping(address => RequestInfo) private ownerToRequestInfo;
    mapping(address => bool) private acctToIsRequestExecutor;
    mapping(address => uint256) private ownerToLastRequestCancellation;

    modifier onlyFundOwner() {
        require(msg.sender == fundOwner, "Only fund owner callable");
        _;
    }

    /// @notice Initializes a proxy instance that uses this library
    /// @dev Serves as a per-proxy pseudo-constructor
    function init(address _comptrollerProxy) external override {
        require(comptrollerProxy == address(0), "init: Already initialized");

        comptrollerProxy = _comptrollerProxy;

        // Cache frequently-used values that require external calls
        ComptrollerLib comptrollerProxyContract = ComptrollerLib(_comptrollerProxy);
        denominationAsset = comptrollerProxyContract.getDenominationAsset();
        fundOwner = VaultLib(comptrollerProxyContract.getVaultProxy()).getOwner();
    }

    /// @notice Cancels the shares request of the caller
    function cancelRequest() external {
        RequestInfo memory request = ownerToRequestInfo[msg.sender];
        require(request.investmentAmount > 0, "cancelRequest: Request does not exist");

        // Delete the request, start the cooldown period, and return the investment asset
        delete ownerToRequestInfo[msg.sender];
        ownerToLastRequestCancellation[msg.sender] = block.timestamp;
        ERC20(denominationAsset).safeTransfer(msg.sender, request.investmentAmount);

        emit RequestCanceled(msg.sender, request.investmentAmount, request.minSharesQuantity);
    }

    /// @notice Creates a shares request for the caller
    /// @param _investmentAmount The amount of the fund's denomination asset to use to buy shares
    /// @param _minSharesQuantity The minimum quantity of shares to buy with the _investmentAmount
    function createRequest(uint256 _investmentAmount, uint256 _minSharesQuantity) external {
        require(_investmentAmount > 0, "createRequest: _investmentAmount must be > 0");
        require(
            ownerToRequestInfo[msg.sender].investmentAmount == 0,
            "createRequest: The request owner can only create one request before executed or canceled"
        );
        require(
            ownerToLastRequestCancellation[msg.sender] <
                block.timestamp.sub(CANCELLATION_COOLDOWN_TIMELOCK),
            "createRequest: Cannot create request during cancellation cooldown period"
        );

        // Create the Request and take custody of investment asset
        ownerToRequestInfo[msg.sender] = RequestInfo({
            investmentAmount: _investmentAmount,
            minSharesQuantity: _minSharesQuantity
        });
        ERC20(denominationAsset).safeTransferFrom(msg.sender, address(this), _investmentAmount);

        emit RequestCreated(msg.sender, _investmentAmount, _minSharesQuantity);
    }

    /// @notice Executes multiple shares requests
    /// @param _requestOwners The owners of the pending shares requests
    function executeRequests(address[] calldata _requestOwners) external {
        require(
            msg.sender == fundOwner || isRequestExecutor(msg.sender),
            "executeRequests: Invalid caller"
        );
        require(_requestOwners.length > 0, "executeRequests: _requestOwners can not be empty");

        (
            address[] memory buyers,
            uint256[] memory investmentAmounts,
            uint256[] memory minSharesQuantities,
            uint256 totalInvestmentAmount
        ) = __convertRequestsToBuySharesParams(_requestOwners);

        // Since ComptrollerProxy instances are fully trusted,
        // we can approve them with the max amount of the denomination asset,
        // and only top the approval back to max if ever necessary.
        address comptrollerProxyCopy = comptrollerProxy;
        ERC20 denominationAssetContract = ERC20(denominationAsset);
        if (
            denominationAssetContract.allowance(address(this), comptrollerProxyCopy) <
            totalInvestmentAmount
        ) {
            denominationAssetContract.approve(comptrollerProxyCopy, type(uint256).max);
        }

        ComptrollerLib(comptrollerProxyCopy).buyShares(
            buyers,
            investmentAmounts,
            minSharesQuantities
        );
    }

    /// @dev Helper to convert raw shares requests into the format required by buyShares().
    /// It also removes any empty requests, which is necessary to prevent a DoS attack where a user
    /// cancels their request earlier in the same block (can be repeated from multiple accounts).
    /// This function also removes shares requests and fires success events as it loops through them.
    function __convertRequestsToBuySharesParams(address[] memory _requestOwners)
        private
        returns (
            address[] memory buyers_,
            uint256[] memory investmentAmounts_,
            uint256[] memory minSharesQuantities_,
            uint256 totalInvestmentAmount_
        )
    {
        uint256 existingRequestsCount = _requestOwners.length;
        uint256[] memory allInvestmentAmounts = new uint256[](_requestOwners.length);

        // Loop through once to get the count of existing requests
        for (uint256 i; i < _requestOwners.length; i++) {
            allInvestmentAmounts[i] = ownerToRequestInfo[_requestOwners[i]].investmentAmount;

            if (allInvestmentAmounts[i] == 0) {
                existingRequestsCount--;
            }
        }

        // Loop through a second time to format requests for buyShares(),
        // and to delete the requests and emit events early so no further looping is needed.
        buyers_ = new address[](existingRequestsCount);
        investmentAmounts_ = new uint256[](existingRequestsCount);
        minSharesQuantities_ = new uint256[](existingRequestsCount);
        uint256 existingRequestsIndex;
        for (uint256 i; i < _requestOwners.length; i++) {
            if (allInvestmentAmounts[i] == 0) {
                continue;
            }

            buyers_[existingRequestsIndex] = _requestOwners[i];
            investmentAmounts_[existingRequestsIndex] = allInvestmentAmounts[i];
            minSharesQuantities_[existingRequestsIndex] = ownerToRequestInfo[_requestOwners[i]]
                .minSharesQuantity;
            totalInvestmentAmount_ = totalInvestmentAmount_.add(allInvestmentAmounts[i]);

            delete ownerToRequestInfo[_requestOwners[i]];

            emit RequestExecuted(
                msg.sender,
                buyers_[existingRequestsIndex],
                investmentAmounts_[existingRequestsIndex],
                minSharesQuantities_[existingRequestsIndex]
            );

            existingRequestsIndex++;
        }

        return (buyers_, investmentAmounts_, minSharesQuantities_, totalInvestmentAmount_);
    }

    ///////////////////////////////
    // REQUEST EXECUTOR REGISTRY //
    ///////////////////////////////

    /// @notice Adds accounts to request executors
    /// @param _requestExecutors Accounts to add
    function addRequestExecutors(address[] calldata _requestExecutors) external onlyFundOwner {
        require(_requestExecutors.length > 0, "addRequestExecutors: Empty _requestExecutors");

        for (uint256 i; i < _requestExecutors.length; i++) {
            require(
                !isRequestExecutor(_requestExecutors[i]),
                "addRequestExecutors: Value already set"
            );
            require(
                _requestExecutors[i] != fundOwner,
                "addRequestExecutors: The fund owner cannot be added"
            );

            acctToIsRequestExecutor[_requestExecutors[i]] = true;

            emit RequestExecutorAdded(_requestExecutors[i]);
        }
    }

    /// @notice Removes accounts from request executors
    /// @param _requestExecutors Accounts to remove
    function removeRequestExecutors(address[] calldata _requestExecutors) external onlyFundOwner {
        require(_requestExecutors.length > 0, "removeRequestExecutors: Empty _requestExecutors");

        for (uint256 i; i < _requestExecutors.length; i++) {
            require(
                isRequestExecutor(_requestExecutors[i]),
                "removeRequestExecutors: Account is not a request executor"
            );

            acctToIsRequestExecutor[_requestExecutors[i]] = false;

            emit RequestExecutorRemoved(_requestExecutors[i]);
        }
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the value of `comptrollerProxy` variable
    /// @return comptrollerProxy_ The `comptrollerProxy` variable value
    function getComptrollerProxy() external view returns (address comptrollerProxy_) {
        return comptrollerProxy;
    }

    /// @notice Gets the value of `denominationAsset` variable
    /// @return denominationAsset_ The `denominationAsset` variable value
    function getDenominationAsset() external view returns (address denominationAsset_) {
        return denominationAsset;
    }

    /// @notice Gets the value of `fundOwner` variable
    /// @return fundOwner_ The `fundOwner` variable value
    function getFundOwner() external view returns (address fundOwner_) {
        return fundOwner;
    }

    /// @notice Gets the request info of a user
    /// @param _requestOwner The address of the user that creates the request
    /// @return requestInfo_ The request info created by the user
    function getSharesRequestInfoForOwner(address _requestOwner)
        external
        view
        returns (RequestInfo memory requestInfo_)
    {
        return ownerToRequestInfo[_requestOwner];
    }

    /// @notice Checks whether an account is a request executor
    /// @param _who The account to check
    /// @return isRequestExecutor_ True if _who is a request executor
    function isRequestExecutor(address _who) public view returns (bool isRequestExecutor_) {
        return acctToIsRequestExecutor[_who];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../utils/Proxy.sol";

contract AuthUserExecutedSharesRequestorProxy is Proxy {
    constructor(bytes memory _constructData, address _authUserExecutedSharesRequestorLib)
        public
        Proxy(_constructData, _authUserExecutedSharesRequestorLib)
    {}
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../utils/AddressListPolicyMixin.sol";
import "./utils/BuySharesSetupPolicyBase.sol";

/// @title BuySharesCallerWhitelist Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A policy that only allows a configurable whitelist of buyShares callers for a fund
contract BuySharesCallerWhitelist is BuySharesSetupPolicyBase, AddressListPolicyMixin {
    constructor(address _policyManager) public PolicyBase(_policyManager) {}

    /// @notice Adds the initial policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function addFundSettings(address _comptrollerProxy, bytes calldata _encodedSettings)
        external
        override
        onlyPolicyManager
    {
        __updateList(_comptrollerProxy, _encodedSettings);
    }

    /// @notice Provides a constant string identifier for a policy
    /// @return identifier_ The identifer string
    function identifier() external pure override returns (string memory identifier_) {
        return "BUY_SHARES_CALLER_WHITELIST";
    }

    /// @notice Updates the policy settings for a fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedSettings Encoded settings to apply to a fund
    function updateFundSettings(
        address _comptrollerProxy,
        address,
        bytes calldata _encodedSettings
    ) external override onlyPolicyManager {
        __updateList(_comptrollerProxy, _encodedSettings);
    }

    /// @notice Checks whether a particular condition passes the rule for a particular fund
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _buySharesCaller The buyShares caller for which to check the rule
    /// @return isValid_ True if the rule passes
    function passesRule(address _comptrollerProxy, address _buySharesCaller)
        public
        view
        returns (bool isValid_)
    {
        return isInList(_comptrollerProxy, _buySharesCaller);
    }

    /// @notice Apply the rule with the specified parameters of a PolicyHook
    /// @param _comptrollerProxy The fund's ComptrollerProxy address
    /// @param _encodedArgs Encoded args with which to validate the rule
    /// @return isValid_ True if the rule passes
    function validateRule(
        address _comptrollerProxy,
        address,
        IPolicyManager.PolicyHook,
        bytes calldata _encodedArgs
    ) external override returns (bool isValid_) {
        (address caller, , ) = __decodeRuleArgs(_encodedArgs);

        return passesRule(_comptrollerProxy, caller);
    }

    /// @dev Helper to update the whitelist by adding and/or removing addresses
    function __updateList(address _comptrollerProxy, bytes memory _settingsData) private {
        (address[] memory itemsToAdd, address[] memory itemsToRemove) = abi.decode(
            _settingsData,
            (address[], address[])
        );

        // If an address is in both add and remove arrays, they will not be in the final list.
        // We do not check for uniqueness between the two arrays for efficiency.
        if (itemsToAdd.length > 0) {
            __addToList(_comptrollerProxy, itemsToAdd);
        }
        if (itemsToRemove.length > 0) {
            __removeFromList(_comptrollerProxy, itemsToRemove);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../utils/PolicyBase.sol";

/// @title BuySharesSetupPolicyBase Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A mixin contract for policies that only implement the BuySharesSetup policy hook
abstract contract BuySharesSetupPolicyBase is PolicyBase {
    /// @notice Gets the implemented PolicyHooks for a policy
    /// @return implementedHooks_ The implemented PolicyHooks
    function implementedHooks()
        external
        view
        override
        returns (IPolicyManager.PolicyHook[] memory implementedHooks_)
    {
        implementedHooks_ = new IPolicyManager.PolicyHook[](1);
        implementedHooks_[0] = IPolicyManager.PolicyHook.BuySharesSetup;

        return implementedHooks_;
    }

    /// @notice Helper to decode rule arguments
    function __decodeRuleArgs(bytes memory _encodedArgs)
        internal
        pure
        returns (
            address caller_,
            uint256[] memory investmentAmounts_,
            uint256 gav_
        )
    {
        return abi.decode(_encodedArgs, (address, uint256[], uint256));
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../../release/infrastructure/value-interpreter/IValueInterpreter.sol";
import "../../release/infrastructure/price-feeds/derivatives/IAggregatedDerivativePriceFeed.sol";
import "../../release/infrastructure/price-feeds/primitives/IPrimitivePriceFeed.sol";

/// @dev This contract acts as a centralized rate provider for mocks.
/// Suited for a dev environment, it doesn't take into account gas costs.
contract CentralizedRateProvider is Ownable {
    using SafeMath for uint256;

    address private immutable WETH;
    uint256 private maxDeviationPerSender;

    // Addresses are not immutable to facilitate lazy load (they're are not accessible at the mock env).
    address private valueInterpreter;
    address private aggregateDerivativePriceFeed;
    address private primitivePriceFeed;

    constructor(address _weth, uint256 _maxDeviationPerSender) public {
        maxDeviationPerSender = _maxDeviationPerSender;
        WETH = _weth;
    }

    /// @dev Calculates the value of a _baseAsset relative to a _quoteAsset.
    /// Label to ValueInterprete's calcLiveAssetValue
    function calcLiveAssetValue(
        address _baseAsset,
        uint256 _amount,
        address _quoteAsset
    ) public returns (uint256 value_) {
        uint256 baseDecimalsRate = 10**uint256(ERC20(_baseAsset).decimals());
        uint256 quoteDecimalsRate = 10**uint256(ERC20(_quoteAsset).decimals());

        // 1. Check if quote asset is a primitive. If it is, use ValueInterpreter normally.
        if (IPrimitivePriceFeed(primitivePriceFeed).isSupportedAsset(_quoteAsset)) {
            (value_, ) = IValueInterpreter(valueInterpreter).calcLiveAssetValue(
                _baseAsset,
                _amount,
                _quoteAsset
            );
            return value_;
        }

        // 2. Otherwise, check if base asset is a primitive, and use inverse rate from Value Interpreter.
        if (IPrimitivePriceFeed(primitivePriceFeed).isSupportedAsset(_baseAsset)) {
            (uint256 inverseRate, ) = IValueInterpreter(valueInterpreter).calcLiveAssetValue(
                _quoteAsset,
                10**uint256(ERC20(_quoteAsset).decimals()),
                _baseAsset
            );

            uint256 rate = uint256(baseDecimalsRate).mul(quoteDecimalsRate).div(inverseRate);

            value_ = _amount.mul(rate).div(baseDecimalsRate);
            return value_;
        }

        // 3. If both assets are derivatives, calculate the rate against ETH.
        (uint256 baseToWeth, ) = IValueInterpreter(valueInterpreter).calcLiveAssetValue(
            _baseAsset,
            baseDecimalsRate,
            WETH
        );

        (uint256 quoteToWeth, ) = IValueInterpreter(valueInterpreter).calcLiveAssetValue(
            _quoteAsset,
            quoteDecimalsRate,
            WETH
        );

        value_ = _amount.mul(baseToWeth).mul(quoteDecimalsRate).div(quoteToWeth).div(
            baseDecimalsRate
        );
        return value_;
    }

    /// @dev Calculates a randomized live value of an asset
    /// Aggregation of two randomization seeds: msg.sender, and by block.number.
    function calcLiveAssetValueRandomized(
        address _baseAsset,
        uint256 _amount,
        address _quoteAsset,
        uint256 _maxDeviationPerBlock
    ) external returns (uint256 value_) {
        uint256 liveAssetValue = calcLiveAssetValue(_baseAsset, _amount, _quoteAsset);

        // Range [liveAssetValue * (1 - _blockNumberDeviation), liveAssetValue * (1 + _blockNumberDeviation)]
        uint256 senderRandomizedValue_ = __calcValueRandomizedByAddress(
            liveAssetValue,
            msg.sender,
            maxDeviationPerSender
        );

        // Range [liveAssetValue * (1 - _maxDeviationPerBlock - maxDeviationPerSender), liveAssetValue * (1 + _maxDeviationPerBlock + maxDeviationPerSender)]
        value_ = __calcValueRandomizedByUint(
            senderRandomizedValue_,
            block.number,
            _maxDeviationPerBlock
        );

        return value_;
    }

    /// @dev Calculates the live value of an asset including a grade of pseudo randomization, using msg.sender as the source of randomness
    function calcLiveAssetValueRandomizedByBlockNumber(
        address _baseAsset,
        uint256 _amount,
        address _quoteAsset,
        uint256 _maxDeviationPerBlock
    ) external returns (uint256 value_) {
        uint256 liveAssetValue = calcLiveAssetValue(_baseAsset, _amount, _quoteAsset);

        value_ = __calcValueRandomizedByUint(liveAssetValue, block.number, _maxDeviationPerBlock);

        return value_;
    }

    /// @dev Calculates the live value of an asset including a grade of pseudo-randomization, using `block.number` as the source of randomness
    function calcLiveAssetValueRandomizedBySender(
        address _baseAsset,
        uint256 _amount,
        address _quoteAsset
    ) external returns (uint256 value_) {
        uint256 liveAssetValue = calcLiveAssetValue(_baseAsset, _amount, _quoteAsset);

        value_ = __calcValueRandomizedByAddress(liveAssetValue, msg.sender, maxDeviationPerSender);

        return value_;
    }

    function setMaxDeviationPerSender(uint256 _maxDeviationPerSender) external onlyOwner {
        maxDeviationPerSender = _maxDeviationPerSender;
    }

    /// @dev Connector from release environment, inject price variables into the provider.
    function setReleasePriceAddresses(
        address _valueInterpreter,
        address _aggregateDerivativePriceFeed,
        address _primitivePriceFeed
    ) external onlyOwner {
        valueInterpreter = _valueInterpreter;
        aggregateDerivativePriceFeed = _aggregateDerivativePriceFeed;
        primitivePriceFeed = _primitivePriceFeed;
    }

    // PRIVATE FUNCTIONS

    /// @dev Calculates a a pseudo-randomized value as a seed an address
    function __calcValueRandomizedByAddress(
        uint256 _meanValue,
        address _seed,
        uint256 _maxDeviation
    ) private pure returns (uint256 value_) {
        // Value between [0, 100]
        uint256 senderRandomFactor = uint256(uint8(_seed))
            .mul(100)
            .div(256)
            .mul(_maxDeviation)
            .div(100);

        value_ = __calcDeviatedValue(_meanValue, senderRandomFactor, _maxDeviation);

        return value_;
    }

    /// @dev Calculates a a pseudo-randomized value as a seed an uint256
    function __calcValueRandomizedByUint(
        uint256 _meanValue,
        uint256 _seed,
        uint256 _maxDeviation
    ) private pure returns (uint256 value_) {
        // Depending on the _seed number, it will be one of {20, 40, 60, 80, 100}
        uint256 randomFactor = (_seed.mod(2).mul(20))
            .add((_seed.mod(3).mul(40)))
            .mul(_maxDeviation)
            .div(100);

        value_ = __calcDeviatedValue(_meanValue, randomFactor, _maxDeviation);

        return value_;
    }

    /// @dev Given a mean value and a max deviation, returns a value in the spectrum between 0 (_meanValue - maxDeviation) and 100 (_mean + maxDeviation)
    /// TODO: Refactor to use 18 decimal precision
    function __calcDeviatedValue(
        uint256 _meanValue,
        uint256 _offset,
        uint256 _maxDeviation
    ) private pure returns (uint256 value_) {
        return
            _meanValue.add((_meanValue.mul((uint256(2)).mul(_offset)).div(uint256(100)))).sub(
                _meanValue.mul(_maxDeviation).div(uint256(100))
            );
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    function getMaxDeviationPerSender() public view returns (uint256 maxDeviationPerSender_) {
        return maxDeviationPerSender;
    }

    function getValueInterpreter() public view returns (address valueInterpreter_) {
        return valueInterpreter;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../../interfaces/IChai.sol";
import "../utils/AdapterBase.sol";

/// @title ChaiAdapter Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Adapter for Chai <https://github.com/dapphub/chai>
contract ChaiAdapter is AdapterBase {
    address private immutable CHAI;
    address private immutable DAI;

    constructor(
        address _integrationManager,
        address _chai,
        address _dai
    ) public AdapterBase(_integrationManager) {
        CHAI = _chai;
        DAI = _dai;
    }

    /// @notice Provides a constant string identifier for an adapter
    /// @return identifier_ An identifier string
    function identifier() external pure override returns (string memory identifier_) {
        return "CHAI";
    }

    /// @notice Parses the expected assets to receive from a call on integration
    /// @param _selector The function selector for the callOnIntegration
    /// @param _encodedCallArgs The encoded parameters for the callOnIntegration
    /// @return spendAssetsHandleType_ A type that dictates how to handle granting
    /// the adapter access to spend assets (`None` by default)
    /// @return spendAssets_ The assets to spend in the call
    /// @return spendAssetAmounts_ The max asset amounts to spend in the call
    /// @return incomingAssets_ The assets to receive in the call
    /// @return minIncomingAssetAmounts_ The min asset amounts to receive in the call
    function parseAssetsForMethod(bytes4 _selector, bytes calldata _encodedCallArgs)
        external
        view
        override
        returns (
            IIntegrationManager.SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory spendAssetAmounts_,
            address[] memory incomingAssets_,
            uint256[] memory minIncomingAssetAmounts_
        )
    {
        if (_selector == LEND_SELECTOR) {
            (uint256 daiAmount, uint256 minChaiAmount) = __decodeCallArgs(_encodedCallArgs);

            spendAssets_ = new address[](1);
            spendAssets_[0] = DAI;
            spendAssetAmounts_ = new uint256[](1);
            spendAssetAmounts_[0] = daiAmount;

            incomingAssets_ = new address[](1);
            incomingAssets_[0] = CHAI;
            minIncomingAssetAmounts_ = new uint256[](1);
            minIncomingAssetAmounts_[0] = minChaiAmount;
        } else if (_selector == REDEEM_SELECTOR) {
            (uint256 chaiAmount, uint256 minDaiAmount) = __decodeCallArgs(_encodedCallArgs);

            spendAssets_ = new address[](1);
            spendAssets_[0] = CHAI;
            spendAssetAmounts_ = new uint256[](1);
            spendAssetAmounts_[0] = chaiAmount;

            incomingAssets_ = new address[](1);
            incomingAssets_[0] = DAI;
            minIncomingAssetAmounts_ = new uint256[](1);
            minIncomingAssetAmounts_[0] = minDaiAmount;
        } else {
            revert("parseAssetsForMethod: _selector invalid");
        }

        return (
            IIntegrationManager.SpendAssetsHandleType.Transfer,
            spendAssets_,
            spendAssetAmounts_,
            incomingAssets_,
            minIncomingAssetAmounts_
        );
    }

    /// @notice Lend Dai for Chai
    /// @param _vaultProxy The VaultProxy of the calling fund
    /// @param _encodedCallArgs Encoded order parameters
    /// @param _encodedAssetTransferArgs Encoded args for expected assets to spend and receive
    function lend(
        address _vaultProxy,
        bytes calldata _encodedCallArgs,
        bytes calldata _encodedAssetTransferArgs
    )
        external
        onlyIntegrationManager
        fundAssetsTransferHandler(_vaultProxy, _encodedAssetTransferArgs)
    {
        (uint256 daiAmount, ) = __decodeCallArgs(_encodedCallArgs);

        __approveMaxAsNeeded(DAI, CHAI, daiAmount);

        // Execute Lend on Chai
        // Chai.join allows specifying the vaultProxy as the destination of Chai tokens
        IChai(CHAI).join(_vaultProxy, daiAmount);
    }

    /// @notice Redeem Chai for Dai
    /// @param _vaultProxy The VaultProxy of the calling fund
    /// @param _encodedCallArgs Encoded order parameters
    /// @param _encodedAssetTransferArgs Encoded args for expected assets to spend and receive
    function redeem(
        address _vaultProxy,
        bytes calldata _encodedCallArgs,
        bytes calldata _encodedAssetTransferArgs
    )
        external
        onlyIntegrationManager
        fundAssetsTransferHandler(_vaultProxy, _encodedAssetTransferArgs)
    {
        (uint256 chaiAmount, ) = __decodeCallArgs(_encodedCallArgs);

        // Execute redeem on Chai
        // Chai.exit sends Dai back to the adapter
        IChai(CHAI).exit(address(this), chaiAmount);
    }

    // PRIVATE FUNCTIONS

    /// @dev Helper to decode the encoded call arguments
    function __decodeCallArgs(bytes memory _encodedCallArgs)
        private
        pure
        returns (uint256 outgoingAmount_, uint256 minIncomingAmount_)
    {
        return abi.decode(_encodedCallArgs, (uint256, uint256));
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `CHAI` variable value
    /// @return chai_ The `CHAI` variable value
    function getChai() external view returns (address chai_) {
        return CHAI;
    }

    /// @notice Gets the `DAI` variable value
    /// @return dai_ The `DAI` variable value
    function getDai() external view returns (address dai_) {
        return DAI;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../../../interfaces/IMakerDaoPot.sol";
import "../IDerivativePriceFeed.sol";

/// @title ChaiPriceFeed Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Price source oracle for Chai
contract ChaiPriceFeed is IDerivativePriceFeed {
    using SafeMath for uint256;

    uint256 private constant CHI_DIVISOR = 10**27;
    address private immutable CHAI;
    address private immutable DAI;
    address private immutable DSR_POT;

    constructor(
        address _chai,
        address _dai,
        address _dsrPot
    ) public {
        CHAI = _chai;
        DAI = _dai;
        DSR_POT = _dsrPot;
    }

    /// @notice Converts a given amount of a derivative to its underlying asset values
    /// @param _derivative The derivative to convert
    /// @param _derivativeAmount The amount of the derivative to convert
    /// @return underlyings_ The underlying assets for the _derivative
    /// @return underlyingAmounts_ The amount of each underlying asset for the equivalent derivative amount
    /// @dev Calculation based on Chai source: https://github.com/dapphub/chai/blob/master/src/chai.sol
    function calcUnderlyingValues(address _derivative, uint256 _derivativeAmount)
        external
        override
        returns (address[] memory underlyings_, uint256[] memory underlyingAmounts_)
    {
        require(isSupportedAsset(_derivative), "calcUnderlyingValues: Only Chai is supported");

        underlyings_ = new address[](1);
        underlyings_[0] = DAI;
        underlyingAmounts_ = new uint256[](1);
        underlyingAmounts_[0] = _derivativeAmount.mul(IMakerDaoPot(DSR_POT).chi()).div(
            CHI_DIVISOR
        );
    }

    /// @notice Checks if an asset is supported by the price feed
    /// @param _asset The asset to check
    /// @return isSupported_ True if the asset is supported
    function isSupportedAsset(address _asset) public view override returns (bool isSupported_) {
        return _asset == CHAI;
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `CHAI` variable value
    /// @return chai_ The `CHAI` variable value
    function getChai() external view returns (address chai_) {
        return CHAI;
    }

    /// @notice Gets the `DAI` variable value
    /// @return dai_ The `DAI` variable value
    function getDai() external view returns (address dai_) {
        return DAI;
    }

    /// @notice Gets the `DSR_POT` variable value
    /// @return dsrPot_ The `DSR_POT` variable value
    function getDsrPot() external view returns (address dsrPot_) {
        return DSR_POT;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../../../interfaces/IChainlinkAggregator.sol";
import "../../utils/DispatcherOwnerMixin.sol";
import "./IPrimitivePriceFeed.sol";

/// @title ChainlinkPriceFeed Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A price feed that uses Chainlink oracles as price sources
contract ChainlinkPriceFeed is IPrimitivePriceFeed, DispatcherOwnerMixin {
    using SafeMath for uint256;

    event EthUsdAggregatorSet(address prevEthUsdAggregator, address nextEthUsdAggregator);

    event PrimitiveAdded(
        address indexed primitive,
        address aggregator,
        RateAsset rateAsset,
        uint256 unit
    );

    event PrimitiveRemoved(address indexed primitive);

    event PrimitiveUpdated(
        address indexed primitive,
        address prevAggregator,
        address nextAggregator
    );

    event StalePrimitiveRemoved(address indexed primitive);

    event StaleRateThresholdSet(uint256 prevStaleRateThreshold, uint256 nextStaleRateThreshold);

    enum RateAsset {ETH, USD}

    struct AggregatorInfo {
        address aggregator;
        RateAsset rateAsset;
    }

    uint256 private constant ETH_UNIT = 10**18;
    address private immutable WETH_TOKEN;

    address private ethUsdAggregator;
    uint256 private staleRateThreshold;
    mapping(address => AggregatorInfo) private primitiveToAggregatorInfo;
    mapping(address => uint256) private primitiveToUnit;

    constructor(
        address _dispatcher,
        address _wethToken,
        address _ethUsdAggregator,
        address[] memory _primitives,
        address[] memory _aggregators,
        RateAsset[] memory _rateAssets
    ) public DispatcherOwnerMixin(_dispatcher) {
        WETH_TOKEN = _wethToken;
        staleRateThreshold = 25 hours; // 24 hour heartbeat + 1hr buffer
        __setEthUsdAggregator(_ethUsdAggregator);
        if (_primitives.length > 0) {
            __addPrimitives(_primitives, _aggregators, _rateAssets);
        }
    }

    // EXTERNAL FUNCTIONS

    /// @notice Calculates the value of a base asset in terms of a quote asset (using a canonical rate)
    /// @param _baseAsset The base asset
    /// @param _baseAssetAmount The base asset amount to convert
    /// @param _quoteAsset The quote asset
    /// @return quoteAssetAmount_ The equivalent quote asset amount
    /// @return isValid_ True if the rates used in calculations are deemed valid
    function calcCanonicalValue(
        address _baseAsset,
        uint256 _baseAssetAmount,
        address _quoteAsset
    ) public view override returns (uint256 quoteAssetAmount_, bool isValid_) {
        // Case where _baseAsset == _quoteAsset is handled by ValueInterpreter

        int256 baseAssetRate = __getLatestRateData(_baseAsset);
        if (baseAssetRate <= 0) {
            return (0, false);
        }

        int256 quoteAssetRate = __getLatestRateData(_quoteAsset);
        if (quoteAssetRate <= 0) {
            return (0, false);
        }

        (quoteAssetAmount_, isValid_) = __calcConversionAmount(
            _baseAsset,
            _baseAssetAmount,
            uint256(baseAssetRate),
            _quoteAsset,
            uint256(quoteAssetRate)
        );

        return (quoteAssetAmount_, isValid_);
    }

    /// @notice Calculates the value of a base asset in terms of a quote asset (using a live rate)
    /// @param _baseAsset The base asset
    /// @param _baseAssetAmount The base asset amount to convert
    /// @param _quoteAsset The quote asset
    /// @return quoteAssetAmount_ The equivalent quote asset amount
    /// @return isValid_ True if the rates used in calculations are deemed valid
    /// @dev Live and canonical values are the same for Chainlink
    function calcLiveValue(
        address _baseAsset,
        uint256 _baseAssetAmount,
        address _quoteAsset
    ) external view override returns (uint256 quoteAssetAmount_, bool isValid_) {
        return calcCanonicalValue(_baseAsset, _baseAssetAmount, _quoteAsset);
    }

    /// @notice Checks whether an asset is a supported primitive of the price feed
    /// @param _asset The asset to check
    /// @return isSupported_ True if the asset is a supported primitive
    function isSupportedAsset(address _asset) external view override returns (bool isSupported_) {
        return _asset == WETH_TOKEN || primitiveToAggregatorInfo[_asset].aggregator != address(0);
    }

    /// @notice Sets the `ehUsdAggregator` variable value
    /// @param _nextEthUsdAggregator The `ehUsdAggregator` value to set
    function setEthUsdAggregator(address _nextEthUsdAggregator) external onlyDispatcherOwner {
        __setEthUsdAggregator(_nextEthUsdAggregator);
    }

    // PRIVATE FUNCTIONS

    /// @dev Helper to convert an amount from a _baseAsset to a _quoteAsset
    function __calcConversionAmount(
        address _baseAsset,
        uint256 _baseAssetAmount,
        uint256 _baseAssetRate,
        address _quoteAsset,
        uint256 _quoteAssetRate
    ) private view returns (uint256 quoteAssetAmount_, bool isValid_) {
        RateAsset baseAssetRateAsset = getRateAssetForPrimitive(_baseAsset);
        RateAsset quoteAssetRateAsset = getRateAssetForPrimitive(_quoteAsset);
        uint256 baseAssetUnit = getUnitForPrimitive(_baseAsset);
        uint256 quoteAssetUnit = getUnitForPrimitive(_quoteAsset);

        // If rates are both in ETH or both in USD
        if (baseAssetRateAsset == quoteAssetRateAsset) {
            return (
                __calcConversionAmountSameRateAsset(
                    _baseAssetAmount,
                    baseAssetUnit,
                    _baseAssetRate,
                    quoteAssetUnit,
                    _quoteAssetRate
                ),
                true
            );
        }

        int256 ethPerUsdRate = IChainlinkAggregator(ethUsdAggregator).latestAnswer();
        if (ethPerUsdRate <= 0) {
            return (0, false);
        }

        // If _baseAsset's rate is in ETH and _quoteAsset's rate is in USD
        if (baseAssetRateAsset == RateAsset.ETH) {
            return (
                __calcConversionAmountEthRateAssetToUsdRateAsset(
                    _baseAssetAmount,
                    baseAssetUnit,
                    _baseAssetRate,
                    quoteAssetUnit,
                    _quoteAssetRate,
                    uint256(ethPerUsdRate)
                ),
                true
            );
        }

        // If _baseAsset's rate is in USD and _quoteAsset's rate is in ETH
        return (
            __calcConversionAmountUsdRateAssetToEthRateAsset(
                _baseAssetAmount,
                baseAssetUnit,
                _baseAssetRate,
                quoteAssetUnit,
                _quoteAssetRate,
                uint256(ethPerUsdRate)
            ),
            true
        );
    }

    /// @dev Helper to convert amounts where the base asset has an ETH rate and the quote asset has a USD rate
    function __calcConversionAmountEthRateAssetToUsdRateAsset(
        uint256 _baseAssetAmount,
        uint256 _baseAssetUnit,
        uint256 _baseAssetRate,
        uint256 _quoteAssetUnit,
        uint256 _quoteAssetRate,
        uint256 _ethPerUsdRate
    ) private pure returns (uint256 quoteAssetAmount_) {
        // Only allows two consecutive multiplication operations to avoid potential overflow.
        // Intermediate step needed to resolve stack-too-deep error.
        uint256 intermediateStep = _baseAssetAmount.mul(_baseAssetRate).mul(_ethPerUsdRate).div(
            ETH_UNIT
        );

        return intermediateStep.mul(_quoteAssetUnit).div(_baseAssetUnit).div(_quoteAssetRate);
    }

    /// @dev Helper to convert amounts where base and quote assets both have ETH rates or both have USD rates
    function __calcConversionAmountSameRateAsset(
        uint256 _baseAssetAmount,
        uint256 _baseAssetUnit,
        uint256 _baseAssetRate,
        uint256 _quoteAssetUnit,
        uint256 _quoteAssetRate
    ) private pure returns (uint256 quoteAssetAmount_) {
        // Only allows two consecutive multiplication operations to avoid potential overflow
        return
            _baseAssetAmount.mul(_baseAssetRate).mul(_quoteAssetUnit).div(
                _baseAssetUnit.mul(_quoteAssetRate)
            );
    }

    /// @dev Helper to convert amounts where the base asset has a USD rate and the quote asset has an ETH rate
    function __calcConversionAmountUsdRateAssetToEthRateAsset(
        uint256 _baseAssetAmount,
        uint256 _baseAssetUnit,
        uint256 _baseAssetRate,
        uint256 _quoteAssetUnit,
        uint256 _quoteAssetRate,
        uint256 _ethPerUsdRate
    ) private pure returns (uint256 quoteAssetAmount_) {
        // Only allows two consecutive multiplication operations to avoid potential overflow
        // Intermediate step needed to resolve stack-too-deep error.
        uint256 intermediateStep = _baseAssetAmount.mul(_baseAssetRate).mul(_quoteAssetUnit).div(
            _ethPerUsdRate
        );

        return intermediateStep.mul(ETH_UNIT).div(_baseAssetUnit).div(_quoteAssetRate);
    }

    /// @dev Helper to get the latest rate for a given primitive
    function __getLatestRateData(address _primitive) private view returns (int256 rate_) {
        if (_primitive == WETH_TOKEN) {
            return int256(ETH_UNIT);
        }

        address aggregator = primitiveToAggregatorInfo[_primitive].aggregator;
        require(aggregator != address(0), "__getLatestRateData: Primitive does not exist");

        return IChainlinkAggregator(aggregator).latestAnswer();
    }

    /// @dev Helper to set the `ethUsdAggregator` value
    function __setEthUsdAggregator(address _nextEthUsdAggregator) private {
        address prevEthUsdAggregator = ethUsdAggregator;
        require(
            _nextEthUsdAggregator != prevEthUsdAggregator,
            "__setEthUsdAggregator: Value already set"
        );

        __validateAggregator(_nextEthUsdAggregator);

        ethUsdAggregator = _nextEthUsdAggregator;

        emit EthUsdAggregatorSet(prevEthUsdAggregator, _nextEthUsdAggregator);
    }

    /////////////////////////
    // PRIMITIVES REGISTRY //
    /////////////////////////

    /// @notice Adds a list of primitives with the given aggregator and rateAsset values
    /// @param _primitives The primitives to add
    /// @param _aggregators The ordered aggregators corresponding to the list of _primitives
    /// @param _rateAssets The ordered rate assets corresponding to the list of _primitives
    function addPrimitives(
        address[] calldata _primitives,
        address[] calldata _aggregators,
        RateAsset[] calldata _rateAssets
    ) external onlyDispatcherOwner {
        require(_primitives.length > 0, "addPrimitives: _primitives cannot be empty");

        __addPrimitives(_primitives, _aggregators, _rateAssets);
    }

    /// @notice Removes a list of primitives from the feed
    /// @param _primitives The primitives to remove
    function removePrimitives(address[] calldata _primitives) external onlyDispatcherOwner {
        require(_primitives.length > 0, "removePrimitives: _primitives cannot be empty");

        for (uint256 i; i < _primitives.length; i++) {
            require(
                primitiveToAggregatorInfo[_primitives[i]].aggregator != address(0),
                "removePrimitives: Primitive not yet added"
            );

            delete primitiveToAggregatorInfo[_primitives[i]];
            delete primitiveToUnit[_primitives[i]];

            emit PrimitiveRemoved(_primitives[i]);
        }
    }

    /// @notice Removes stale primitives from the feed
    /// @param _primitives The stale primitives to remove
    /// @dev Callable by anybody
    function removeStalePrimitives(address[] calldata _primitives) external {
        require(_primitives.length > 0, "removeStalePrimitives: _primitives cannot be empty");

        for (uint256 i; i < _primitives.length; i++) {
            address aggregatorAddress = primitiveToAggregatorInfo[_primitives[i]].aggregator;
            require(aggregatorAddress != address(0), "removeStalePrimitives: Invalid primitive");
            require(rateIsStale(aggregatorAddress), "removeStalePrimitives: Rate is not stale");

            delete primitiveToAggregatorInfo[_primitives[i]];
            delete primitiveToUnit[_primitives[i]];

            emit StalePrimitiveRemoved(_primitives[i]);
        }
    }

    /// @notice Sets the `staleRateThreshold` variable
    /// @param _nextStaleRateThreshold The next `staleRateThreshold` value
    function setStaleRateThreshold(uint256 _nextStaleRateThreshold) external onlyDispatcherOwner {
        uint256 prevStaleRateThreshold = staleRateThreshold;
        require(
            _nextStaleRateThreshold != prevStaleRateThreshold,
            "__setStaleRateThreshold: Value already set"
        );

        staleRateThreshold = _nextStaleRateThreshold;

        emit StaleRateThresholdSet(prevStaleRateThreshold, _nextStaleRateThreshold);
    }

    /// @notice Updates the aggregators for given primitives
    /// @param _primitives The primitives to update
    /// @param _aggregators The ordered aggregators corresponding to the list of _primitives
    function updatePrimitives(address[] calldata _primitives, address[] calldata _aggregators)
        external
        onlyDispatcherOwner
    {
        require(_primitives.length > 0, "updatePrimitives: _primitives cannot be empty");
        require(
            _primitives.length == _aggregators.length,
            "updatePrimitives: Unequal _primitives and _aggregators array lengths"
        );

        for (uint256 i; i < _primitives.length; i++) {
            address prevAggregator = primitiveToAggregatorInfo[_primitives[i]].aggregator;
            require(prevAggregator != address(0), "updatePrimitives: Primitive not yet added");
            require(_aggregators[i] != prevAggregator, "updatePrimitives: Value already set");

            __validateAggregator(_aggregators[i]);

            primitiveToAggregatorInfo[_primitives[i]].aggregator = _aggregators[i];

            emit PrimitiveUpdated(_primitives[i], prevAggregator, _aggregators[i]);
        }
    }

    /// @notice Checks whether the current rate is considered stale for the specified aggregator
    /// @param _aggregator The Chainlink aggregator of which to check staleness
    /// @return rateIsStale_ True if the rate is considered stale
    function rateIsStale(address _aggregator) public view returns (bool rateIsStale_) {
        return
            IChainlinkAggregator(_aggregator).latestTimestamp() <
            block.timestamp.sub(staleRateThreshold);
    }

    /// @dev Helper to add primitives to the feed
    function __addPrimitives(
        address[] memory _primitives,
        address[] memory _aggregators,
        RateAsset[] memory _rateAssets
    ) private {
        require(
            _primitives.length == _aggregators.length,
            "__addPrimitives: Unequal _primitives and _aggregators array lengths"
        );
        require(
            _primitives.length == _rateAssets.length,
            "__addPrimitives: Unequal _primitives and _rateAssets array lengths"
        );

        for (uint256 i = 0; i < _primitives.length; i++) {
            require(
                primitiveToAggregatorInfo[_primitives[i]].aggregator == address(0),
                "__addPrimitives: Value already set"
            );

            __validateAggregator(_aggregators[i]);

            primitiveToAggregatorInfo[_primitives[i]] = AggregatorInfo({
                aggregator: _aggregators[i],
                rateAsset: _rateAssets[i]
            });

            // Store the amount that makes up 1 unit given the asset's decimals
            uint256 unit = 10**uint256(ERC20(_primitives[i]).decimals());
            primitiveToUnit[_primitives[i]] = unit;

            emit PrimitiveAdded(_primitives[i], _aggregators[i], _rateAssets[i], unit);
        }
    }

    /// @dev Helper to validate an aggregator by checking its return values for the expected interface
    function __validateAggregator(address _aggregator) private view {
        require(_aggregator != address(0), "__validateAggregator: Empty _aggregator");

        require(
            IChainlinkAggregator(_aggregator).latestAnswer() > 0,
            "__validateAggregator: No rate detected"
        );
        require(!rateIsStale(_aggregator), "__validateAggregator: Stale rate detected");
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the aggregatorInfo variable value for a primitive
    /// @param _primitive The primitive asset for which to get the aggregatorInfo value
    /// @return aggregatorInfo_ The aggregatorInfo value
    function getAggregatorInfoForPrimitive(address _primitive)
        external
        view
        returns (AggregatorInfo memory aggregatorInfo_)
    {
        return primitiveToAggregatorInfo[_primitive];
    }

    /// @notice Gets the `ethUsdAggregator` variable value
    /// @return ethUsdAggregator_ The `ethUsdAggregator` variable value
    function getEthUsdAggregator() external view returns (address ethUsdAggregator_) {
        return ethUsdAggregator;
    }

    /// @notice Gets the `staleRateThreshold` variable value
    /// @return staleRateThreshold_ The `staleRateThreshold` variable value
    function getStaleRateThreshold() external view returns (uint256 staleRateThreshold_) {
        return staleRateThreshold;
    }

    /// @notice Gets the `WETH_TOKEN` variable value
    /// @return wethToken_ The `WETH_TOKEN` variable value
    function getWethToken() external view returns (address wethToken_) {
        return WETH_TOKEN;
    }

    /// @notice Gets the rateAsset variable value for a primitive
    /// @return rateAsset_ The rateAsset variable value
    /// @dev This isn't strictly necessary as WETH_TOKEN will be undefined and thus
    /// the RateAsset will be the 0-position of the enum (i.e. ETH), but it makes the
    /// behavior more explicit
    function getRateAssetForPrimitive(address _primitive)
        public
        view
        returns (RateAsset rateAsset_)
    {
        if (_primitive == WETH_TOKEN) {
            return RateAsset.ETH;
        }

        return primitiveToAggregatorInfo[_primitive].rateAsset;
    }

    /// @notice Gets the unit variable value for a primitive
    /// @return unit_ The unit variable value
    function getUnitForPrimitive(address _primitive) public view returns (uint256 unit_) {
        if (_primitive == WETH_TOKEN) {
            return ETH_UNIT;
        }

        return primitiveToUnit[_primitive];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../../infrastructure/price-feeds/derivatives/feeds/CompoundPriceFeed.sol";
import "../../../../interfaces/ICERC20.sol";
import "../../../../interfaces/ICEther.sol";
import "../../../../interfaces/IWETH.sol";
import "../utils/AdapterBase.sol";

/// @title CompoundAdapter Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Adapter for Compound <https://compound.finance/>
contract CompoundAdapter is AdapterBase {
    address private immutable COMPOUND_PRICE_FEED;
    address private immutable WETH_TOKEN;

    constructor(
        address _integrationManager,
        address _compoundPriceFeed,
        address _wethToken
    ) public AdapterBase(_integrationManager) {
        COMPOUND_PRICE_FEED = _compoundPriceFeed;
        WETH_TOKEN = _wethToken;
    }

    /// @dev Needed to receive ETH during cEther lend/redeem
    receive() external payable {}

    /// @notice Provides a constant string identifier for an adapter
    /// @return identifier_ An identifier string
    function identifier() external pure override returns (string memory identifier_) {
        return "COMPOUND";
    }

    /// @notice Parses the expected assets to receive from a call on integration
    /// @param _selector The function selector for the callOnIntegration
    /// @param _encodedCallArgs The encoded parameters for the callOnIntegration
    /// @return spendAssetsHandleType_ A type that dictates how to handle granting
    /// the adapter access to spend assets (`None` by default)
    /// @return spendAssets_ The assets to spend in the call
    /// @return spendAssetAmounts_ The max asset amounts to spend in the call
    /// @return incomingAssets_ The assets to receive in the call
    /// @return minIncomingAssetAmounts_ The min asset amounts to receive in the call
    function parseAssetsForMethod(bytes4 _selector, bytes calldata _encodedCallArgs)
        external
        view
        override
        returns (
            IIntegrationManager.SpendAssetsHandleType spendAssetsHandleType_,
            address[] memory spendAssets_,
            uint256[] memory spendAssetAmounts_,
            address[] memory incomingAssets_,
            uint256[] memory minIncomingAssetAmounts_
        )
    {
        if (_selector == LEND_SELECTOR) {
            (address cToken, uint256 tokenAmount, uint256 minCTokenAmount) = __decodeCallArgs(
                _encodedCallArgs
            );
            address token = CompoundPriceFeed(COMPOUND_PRICE_FEED).getTokenFromCToken(cToken);
            require(token != address(0), "parseAssetsForMethod: Unsupported cToken");

            spendAssets_ = new address[](1);
            spendAssets_[0] = token;
            spendAssetAmounts_ = new uint256[](1);
            spendAssetAmounts_[0] = tokenAmount;

            incomingAssets_ = new address[](1);
            incomingAssets_[0] = cToken;
            minIncomingAssetAmounts_ = new uint256[](1);
            minIncomingAssetAmounts_[0] = minCTokenAmount;
        } else if (_selector == REDEEM_SELECTOR) {
            (address cToken, uint256 cTokenAmount, uint256 minTokenAmount) = __decodeCallArgs(
                _encodedCallArgs
            );
            address token = CompoundPriceFeed(COMPOUND_PRICE_FEED).getTokenFromCToken(cToken);
            require(token != address(0), "parseAssetsForMethod: Unsupported cToken");

            spendAssets_ = new address[](1);
            spendAssets_[0] = cToken;
            spendAssetAmounts_ = new uint256[](1);
            spendAssetAmounts_[0] = cTokenAmount;

            incomingAssets_ = new address[](1);
            incomingAssets_[0] = token;
            minIncomingAssetAmounts_ = new uint256[](1);
            minIncomingAssetAmounts_[0] = minTokenAmount;
        } else {
            revert("parseAssetsForMethod: _selector invalid");
        }

        return (
            IIntegrationManager.SpendAssetsHandleType.Transfer,
            spendAssets_,
            spendAssetAmounts_,
            incomingAssets_,
            minIncomingAssetAmounts_
        );
    }

    /// @notice Lends an amount of a token to Compound
    /// @param _vaultProxy The VaultProxy of the calling fund
    /// @param _encodedAssetTransferArgs Encoded args for expected assets to spend and receive
    function lend(
        address _vaultProxy,
        bytes calldata,
        bytes calldata _encodedAssetTransferArgs
    )
        external
        onlyIntegrationManager
        fundAssetsTransferHandler(_vaultProxy, _encodedAssetTransferArgs)
    {
        // More efficient to parse all from _encodedAssetTransferArgs
        (
            ,
            address[] memory spendAssets,
            uint256[] memory spendAssetAmounts,
            address[] memory incomingAssets
        ) = __decodeEncodedAssetTransferArgs(_encodedAssetTransferArgs);

        if (spendAssets[0] == WETH_TOKEN) {
            IWETH(WETH_TOKEN).withdraw(spendAssetAmounts[0]);
            ICEther(incomingAssets[0]).mint{value: spendAssetAmounts[0]}();
        } else {
            __approveMaxAsNeeded(spendAssets[0], incomingAssets[0], spendAssetAmounts[0]);
            ICERC20(incomingAssets[0]).mint(spendAssetAmounts[0]);
        }
    }

    /// @notice Redeems an amount of cTokens from Compound
    /// @param _vaultProxy The VaultProxy of the calling fund
    /// @param _encodedAssetTransferArgs Encoded args for expected assets to spend and receive
    function redeem(
        address _vaultProxy,
        bytes calldata,
        bytes calldata _encodedAssetTransferArgs
    )
        external
        onlyIntegrationManager
        fundAssetsTransferHandler(_vaultProxy, _encodedAssetTransferArgs)
    {
        // More efficient to parse all from _encodedAssetTransferArgs
        (
            ,
            address[] memory spendAssets,
            uint256[] memory spendAssetAmounts,
            address[] memory incomingAssets
        ) = __decodeEncodedAssetTransferArgs(_encodedAssetTransferArgs);

        ICERC20(spendAssets[0]).redeem(spendAssetAmounts[0]);

        if (incomingAssets[0] == WETH_TOKEN) {
            IWETH(payable(WETH_TOKEN)).deposit{value: payable(address(this)).balance}();
        }
    }

    // PRIVATE FUNCTIONS

    /// @dev Helper to decode callArgs for lend and redeem
    function __decodeCallArgs(bytes memory _encodedCallArgs)
        private
        pure
        returns (
            address cToken_,
            uint256 outgoingAssetAmount_,
            uint256 minIncomingAssetAmount_
        )
    {
        return abi.decode(_encodedCallArgs, (address, uint256, uint256));
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `COMPOUND_PRICE_FEED` variable
    /// @return compoundPriceFeed_ The `COMPOUND_PRICE_FEED` variable value
    function getCompoundPriceFeed() external view returns (address compoundPriceFeed_) {
        return COMPOUND_PRICE_FEED;
    }

    /// @notice Gets the `WETH_TOKEN` variable
    /// @return wethToken_ The `WETH_TOKEN` variable value
    function getWethToken() external view returns (address wethToken_) {
        return WETH_TOKEN;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "../../../../interfaces/ICERC20.sol";
import "../../../utils/DispatcherOwnerMixin.sol";
import "../IDerivativePriceFeed.sol";

/// @title CompoundPriceFeed Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice Price source oracle for Compound Tokens (cTokens)
contract CompoundPriceFeed is IDerivativePriceFeed, DispatcherOwnerMixin {
    using SafeMath for uint256;

    event CTokenAdded(address indexed cToken, address indexed token);

    uint256 private constant CTOKEN_RATE_DIVISOR = 10**18;

    mapping(address => address) private cTokenToToken;

    constructor(
        address _dispatcher,
        address _weth,
        address _ceth,
        address[] memory cERC20Tokens
    ) public DispatcherOwnerMixin(_dispatcher) {
        // Set cEth
        cTokenToToken[_ceth] = _weth;
        emit CTokenAdded(_ceth, _weth);

        // Set any other cTokens
        if (cERC20Tokens.length > 0) {
            __addCERC20Tokens(cERC20Tokens);
        }
    }

    /// @notice Converts a given amount of a derivative to its underlying asset values
    /// @param _derivative The derivative to convert
    /// @param _derivativeAmount The amount of the derivative to convert
    /// @return underlyings_ The underlying assets for the _derivative
    /// @return underlyingAmounts_ The amount of each underlying asset for the equivalent derivative amount
    function calcUnderlyingValues(address _derivative, uint256 _derivativeAmount)
        external
        override
        returns (address[] memory underlyings_, uint256[] memory underlyingAmounts_)
    {
        underlyings_ = new address[](1);
        underlyings_[0] = cTokenToToken[_derivative];
        require(underlyings_[0] != address(0), "calcUnderlyingValues: Unsupported derivative");

        underlyingAmounts_ = new uint256[](1);
        // Returns a rate scaled to 10^18
        underlyingAmounts_[0] = _derivativeAmount
            .mul(ICERC20(_derivative).exchangeRateStored())
            .div(CTOKEN_RATE_DIVISOR);

        return (underlyings_, underlyingAmounts_);
    }

    /// @notice Checks if an asset is supported by the price feed
    /// @param _asset The asset to check
    /// @return isSupported_ True if the asset is supported
    function isSupportedAsset(address _asset) external view override returns (bool isSupported_) {
        return cTokenToToken[_asset] != address(0);
    }

    //////////////////////
    // CTOKENS REGISTRY //
    //////////////////////

    /// @notice Adds cTokens to the price feed
    /// @param _cTokens cTokens to add
    /// @dev Only allows CERC20 tokens. CEther is set in the constructor.
    function addCTokens(address[] calldata _cTokens) external onlyDispatcherOwner {
        __addCERC20Tokens(_cTokens);
    }

    /// @dev Helper to add cTokens
    function __addCERC20Tokens(address[] memory _cTokens) private {
        require(_cTokens.length > 0, "__addCTokens: Empty _cTokens");

        for (uint256 i; i < _cTokens.length; i++) {
            require(cTokenToToken[_cTokens[i]] == address(0), "__addCTokens: Value already set");

            address token = ICERC20(_cTokens[i]).underlying();
            cTokenToToken[_cTokens[i]] = token;

            emit CTokenAdded(_cTokens[i], token);
        }
    }

    ////////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Returns the underlying asset of a given cToken
    /// @param _cToken The cToken for which to get the underlying asset
    /// @return token_ The underlying token
    function getTokenFromCToken(address _cToken) public view returns (address token_) {
        return cTokenToToken[_cToken];
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "../../../../persistent/dispatcher/IDispatcher.sol";
import "../../../extensions/IExtension.sol";
import "../../../extensions/fee-manager/IFeeManager.sol";
import "../../../extensions/policy-manager/IPolicyManager.sol";
import "../../../infrastructure/price-feeds/primitives/IPrimitivePriceFeed.sol";
import "../../../infrastructure/value-interpreter/IValueInterpreter.sol";
import "../../../utils/AddressArrayLib.sol";
import "../../../utils/AssetFinalityResolver.sol";
import "../../fund-deployer/IFundDeployer.sol";
import "../vault/IVault.sol";
import "./IComptroller.sol";

/// @title ComptrollerLib Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice The core logic library shared by all funds
contract ComptrollerLib is IComptroller, AssetFinalityResolver {
    using AddressArrayLib for address[];
    using SafeMath for uint256;
    using SafeERC20 for ERC20;

    event MigratedSharesDuePaid(uint256 sharesDue);

    event OverridePauseSet(bool indexed overridePause);

    event PreRedeemSharesHookFailed(
        bytes failureReturnData,
        address redeemer,
        uint256 sharesQuantity
    );

    event SharesBought(
        address indexed caller,
        address indexed buyer,
        uint256 investmentAmount,
        uint256 sharesIssued,
        uint256 sharesReceived
    );

    event SharesRedeemed(
        address indexed redeemer,
        uint256 sharesQuantity,
        address[] receivedAssets,
        uint256[] receivedAssetQuantities
    );

    event VaultProxySet(address vaultProxy);

    // Constants and immutables - shared by all proxies
    uint256 private constant SHARES_UNIT = 10**18;
    address private immutable DISPATCHER;
    address private immutable FUND_DEPLOYER;
    address private immutable FEE_MANAGER;
    address private immutable INTEGRATION_MANAGER;
    address private immutable PRIMITIVE_PRICE_FEED;
    address private immutable POLICY_MANAGER;
    address private immutable VALUE_INTERPRETER;

    // Pseudo-constants (can only be set once)

    address internal denominationAsset;
    address internal vaultProxy;
    // True only for the one non-proxy
    bool internal isLib;

    // Storage

    // Allows a fund owner to override a release-level pause
    bool internal overridePause;
    // A reverse-mutex, granting atomic permission for particular contracts to make vault calls
    bool internal permissionedVaultActionAllowed;
    // A mutex to protect against reentrancy
    bool internal reentranceLocked;
    // A timelock between any "shares actions" (i.e., buy and redeem shares), per-account
    uint256 internal sharesActionTimelock;
    mapping(address => uint256) internal acctToLastSharesAction;

    ///////////////
    // MODIFIERS //
    ///////////////

    modifier allowsPermissionedVaultAction {
        __assertPermissionedVaultActionNotAllowed();
        permissionedVaultActionAllowed = true;
        _;
        permissionedVaultActionAllowed = false;
    }

    modifier locksReentrance() {
        __assertNotReentranceLocked();
        reentranceLocked = true;
        _;
        reentranceLocked = false;
    }

    modifier onlyActive() {
        __assertIsActive(vaultProxy);
        _;
    }

    modifier onlyNotPaused() {
        __assertNotPaused();
        _;
    }

    modifier onlyFundDeployer() {
        __assertIsFundDeployer(msg.sender);
        _;
    }

    modifier onlyOwner() {
        __assertIsOwner(msg.sender);
        _;
    }

    modifier timelockedSharesAction(address _account) {
        __assertSharesActionNotTimelocked(_account);
        _;
        acctToLastSharesAction[_account] = block.timestamp;
    }

    // ASSERTION HELPERS

    // Modifiers are inefficient in terms of contract size,
    // so we use helper functions to prevent repetitive inlining of expensive string values.

    /// @dev Since vaultProxy is set during activate(),
    /// we can check that var rather than storing additional state
    function __assertIsActive(address _vaultProxy) private pure {
        require(_vaultProxy != address(0), "Fund not active");
    }

    function __assertIsFundDeployer(address _who) private view {
        require(_who == FUND_DEPLOYER, "Only FundDeployer callable");
    }

    function __assertIsOwner(address _who) private view {
        require(_who == IVault(vaultProxy).getOwner(), "Only fund owner callable");
    }

    function __assertLowLevelCall(bool _success, bytes memory _returnData) private pure {
        require(_success, string(_returnData));
    }

    function __assertNotPaused() private view {
        require(!__fundIsPaused(), "Fund is paused");
    }

    function __assertNotReentranceLocked() private view {
        require(!reentranceLocked, "Re-entrance");
    }

    function __assertPermissionedVaultActionNotAllowed() private view {
        require(!permissionedVaultActionAllowed, "Vault action re-entrance");
    }

    function __assertSharesActionNotTimelocked(address _account) private view {
        require(
            block.timestamp.sub(acctToLastSharesAction[_account]) >= sharesActionTimelock,
            "Shares action timelocked"
        );
    }

    constructor(
        address _dispatcher,
        address _fundDeployer,
        address _valueInterpreter,
        address _feeManager,
        address _integrationManager,
        address _policyManager,
        address _primitivePriceFeed,
        address _synthetixPriceFeed,
        address _synthetixAddressResolver
    ) public AssetFinalityResolver(_synthetixPriceFeed, _synthetixAddressResolver) {
        DISPATCHER = _dispatcher;
        FEE_MANAGER = _feeManager;
        FUND_DEPLOYER = _fundDeployer;
        INTEGRATION_MANAGER = _integrationManager;
        PRIMITIVE_PRICE_FEED = _primitivePriceFeed;
        POLICY_MANAGER = _policyManager;
        VALUE_INTERPRETER = _valueInterpreter;
        isLib = true;
    }

    /////////////
    // GENERAL //
    /////////////

    /// @notice Calls a specified action on an Extension
    /// @param _extension The Extension contract to call (e.g., FeeManager)
    /// @param _actionId An ID representing the action to take on the extension (see extension)
    /// @param _callArgs The encoded data for the call
    /// @dev Used to route arbitrary calls, so that msg.sender is the ComptrollerProxy
    /// (for access control). Uses a mutex of sorts that allows "permissioned vault actions"
    /// during calls originating from this function.
    function callOnExtension(
        address _extension,
        uint256 _actionId,
        bytes calldata _callArgs
    ) external override onlyNotPaused onlyActive locksReentrance allowsPermissionedVaultAction {
        require(
            _extension == FEE_MANAGER || _extension == INTEGRATION_MANAGER,
            "callOnExtension: _extension invalid"
        );

        IExtension(_extension).receiveCallFromComptroller(msg.sender, _actionId, _callArgs);
    }

    /// @notice Sets or unsets an override on a release-wide pause
    /// @param _nextOverridePause True if the pause should be overrode
    function setOverridePause(bool _nextOverridePause) external onlyOwner {
        require(_nextOverridePause != overridePause, "setOverridePause: Value already set");

        overridePause = _nextOverridePause;

        emit OverridePauseSet(_nextOverridePause);
    }

    /// @notice Makes an arbitrary call with the VaultProxy contract as the sender
    /// @param _contract The contract to call
    /// @param _selector The selector to call
    /// @param _encodedArgs The encoded arguments for the call
    function vaultCallOnContract(
        address _contract,
        bytes4 _selector,
        bytes calldata _encodedArgs
    ) external onlyNotPaused onlyActive onlyOwner {
        require(
            IFundDeployer(FUND_DEPLOYER).isRegisteredVaultCall(_contract, _selector),
            "vaultCallOnContract: Unregistered"
        );

        IVault(vaultProxy).callOnContract(_contract, abi.encodePacked(_selector, _encodedArgs));
    }

    /// @dev Helper to check whether the release is paused, and that there is no local override
    function __fundIsPaused() private view returns (bool) {
        return
            IFundDeployer(FUND_DEPLOYER).getReleaseStatus() ==
            IFundDeployer.ReleaseStatus.Paused &&
            !overridePause;
    }

    ////////////////////////////////
    // PERMISSIONED VAULT ACTIONS //
    ////////////////////////////////

    /// @notice Makes a permissioned, state-changing call on the VaultProxy contract
    /// @param _action The enum representing the VaultAction to perform on the VaultProxy
    /// @param _actionData The call data for the action to perform
    function permissionedVaultAction(VaultAction _action, bytes calldata _actionData)
        external
        override
        onlyNotPaused
        onlyActive
    {
        __assertPermissionedVaultAction(msg.sender, _action);

        if (_action == VaultAction.AddTrackedAsset) {
            __vaultActionAddTrackedAsset(_actionData);
        } else if (_action == VaultAction.ApproveAssetSpender) {
            __vaultActionApproveAssetSpender(_actionData);
        } else if (_action == VaultAction.BurnShares) {
            __vaultActionBurnShares(_actionData);
        } else if (_action == VaultAction.MintShares) {
            __vaultActionMintShares(_actionData);
        } else if (_action == VaultAction.RemoveTrackedAsset) {
            __vaultActionRemoveTrackedAsset(_actionData);
        } else if (_action == VaultAction.TransferShares) {
            __vaultActionTransferShares(_actionData);
        } else if (_action == VaultAction.WithdrawAssetTo) {
            __vaultActionWithdrawAssetTo(_actionData);
        }
    }

    /// @dev Helper to assert that a caller is allowed to perform a particular VaultAction
    function __assertPermissionedVaultAction(address _caller, VaultAction _action) private view {
        require(
            permissionedVaultActionAllowed,
            "__assertPermissionedVaultAction: No action allowed"
        );

        if (_caller == INTEGRATION_MANAGER) {
            require(
                _action == VaultAction.ApproveAssetSpender ||
                    _action == VaultAction.AddTrackedAsset ||
                    _action == VaultAction.RemoveTrackedAsset ||
                    _action == VaultAction.WithdrawAssetTo,
                "__assertPermissionedVaultAction: Not valid for IntegrationManager"
            );
        } else if (_caller == FEE_MANAGER) {
            require(
                _action == VaultAction.BurnShares ||
                    _action == VaultAction.MintShares ||
                    _action == VaultAction.TransferShares,
                "__assertPermissionedVaultAction: Not valid for FeeManager"
            );
        } else {
            revert("__assertPermissionedVaultAction: Not a valid actor");
        }
    }

    /// @dev Helper to add a tracked asset to the fund
    function __vaultActionAddTrackedAsset(bytes memory _actionData) private {
        address asset = abi.decode(_actionData, (address));
        IVault(vaultProxy).addTrackedAsset(asset);
    }

    /// @dev Helper to grant a spender an allowance for a fund's asset
    function __vaultActionApproveAssetSpender(bytes memory _actionData) private {
        (address asset, address target, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).approveAssetSpender(asset, target, amount);
    }

    /// @dev Helper to burn fund shares for a particular account
    function __vaultActionBurnShares(bytes memory _actionData) private {
        (address target, uint256 amount) = abi.decode(_actionData, (address, uint256));
        IVault(vaultProxy).burnShares(target, amount);
    }

    /// @dev Helper to mint fund shares to a particular account
    function __vaultActionMintShares(bytes memory _actionData) private {
        (address target, uint256 amount) = abi.decode(_actionData, (address, uint256));
        IVault(vaultProxy).mintShares(target, amount);
    }

    /// @dev Helper to remove a tracked asset from the fund
    function __vaultActionRemoveTrackedAsset(bytes memory _actionData) private {
        address asset = abi.decode(_actionData, (address));

        // Allowing this to fail silently makes it cheaper and simpler
        // for Extensions to not query for the denomination asset
        if (asset != denominationAsset) {
            IVault(vaultProxy).removeTrackedAsset(asset);
        }
    }

    /// @dev Helper to transfer fund shares from one account to another
    function __vaultActionTransferShares(bytes memory _actionData) private {
        (address from, address to, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).transferShares(from, to, amount);
    }

    /// @dev Helper to withdraw an asset from the VaultProxy to a given account
    function __vaultActionWithdrawAssetTo(bytes memory _actionData) private {
        (address asset, address target, uint256 amount) = abi.decode(
            _actionData,
            (address, address, uint256)
        );
        IVault(vaultProxy).withdrawAssetTo(asset, target, amount);
    }

    ///////////////
    // LIFECYCLE //
    ///////////////

    /// @notice Initializes a fund with its core config
    /// @param _denominationAsset The asset in which the fund's value should be denominated
    /// @param _sharesActionTimelock The minimum number of seconds between any two "shares actions"
    /// (buying or selling shares) by the same user
    /// @dev Pseudo-constructor per proxy.
    /// No need to assert access because this is called atomically on deployment,
    /// and once it's called, it cannot be called again.
    function init(address _denominationAsset, uint256 _sharesActionTimelock) external override {
        require(denominationAsset == address(0), "init: Already initialized");
        require(
            IPrimitivePriceFeed(PRIMITIVE_PRICE_FEED).isSupportedAsset(_denominationAsset),
            "init: Bad denomination asset"
        );

        denominationAsset = _denominationAsset;
        sharesActionTimelock = _sharesActionTimelock;
    }

    /// @notice Configure the extensions of a fund
    /// @param _feeManagerConfigData Encoded config for fees to enable
    /// @param _policyManagerConfigData Encoded config for policies to enable
    /// @dev No need to assert anything beyond FundDeployer access.
    /// Called atomically with init(), but after ComptrollerLib has been deployed,
    /// giving access to its state and interface
    function configureExtensions(
        bytes calldata _feeManagerConfigData,
        bytes calldata _policyManagerConfigData
    ) external override onlyFundDeployer {
        if (_feeManagerConfigData.length > 0) {
            IExtension(FEE_MANAGER).setConfigForFund(_feeManagerConfigData);
        }
        if (_policyManagerConfigData.length > 0) {
            IExtension(POLICY_MANAGER).setConfigForFund(_policyManagerConfigData);
        }
    }

    /// @notice Activates the fund by attaching a VaultProxy and activating all Extensions
    /// @param _vaultProxy The VaultProxy to attach to the fund
    /// @param _isMigration True if a migrated fund is being activated
    /// @dev No need to assert anything beyond FundDeployer access.
    function activate(address _vaultProxy, bool _isMigration) external override onlyFundDeployer {
        vaultProxy = _vaultProxy;

        emit VaultProxySet(_vaultProxy);

        if (_isMigration) {
            // Distribute any shares in the VaultProxy to the fund owner.
            // This is a mechanism to ensure that even in the edge case of a fund being unable
            // to payout fee shares owed during migration, these shares are not lost.
            uint256 sharesDue = ERC20(_vaultProxy).balanceOf(_vaultProxy);
            if (sharesDue > 0) {
                IVault(_vaultProxy).transferShares(
                    _vaultProxy,
                    IVault(_vaultProxy).getOwner(),
                    sharesDue
                );

                emit MigratedSharesDuePaid(sharesDue);
            }
        }

        // Note: a future release could consider forcing the adding of a tracked asset here,
        // just in case a fund is migrating from an old configuration where they are not able
        // to remove an asset to get under the tracked assets limit
        IVault(_vaultProxy).addTrackedAsset(denominationAsset);

        // Activate extensions
        IExtension(FEE_MANAGER).activateForFund(_isMigration);
        IExtension(INTEGRATION_MANAGER).activateForFund(_isMigration);
        IExtension(POLICY_MANAGER).activateForFund(_isMigration);
    }

    /// @notice Remove the config for a fund
    /// @dev No need to assert anything beyond FundDeployer access.
    /// Calling onlyNotPaused here rather than in the FundDeployer allows
    /// the owner to potentially override the pause and rescue unpaid fees.
    function destruct()
        external
        override
        onlyFundDeployer
        onlyNotPaused
        allowsPermissionedVaultAction
    {
        // Failsafe to protect the libs against selfdestruct
        require(!isLib, "destruct: Only delegate callable");

        // Deactivate the extensions
        IExtension(FEE_MANAGER).deactivateForFund();
        IExtension(INTEGRATION_MANAGER).deactivateForFund();
        IExtension(POLICY_MANAGER).deactivateForFund();

        // Delete storage of ComptrollerProxy
        // There should never be ETH in the ComptrollerLib, so no need to waste gas
        // to get the fund owner
        selfdestruct(address(0));
    }

    ////////////////
    // ACCOUNTING //
    ////////////////

    /// @notice Calculates the gross asset value (GAV) of the fund
    /// @param _requireFinality True if all assets must have exact final balances settled
    /// @return gav_ The fund GAV
    /// @return isValid_ True if the conversion rates used to derive the GAV are all valid
    function calcGav(bool _requireFinality) public override returns (uint256 gav_, bool isValid_) {
        address vaultProxyAddress = vaultProxy;
        address[] memory assets = IVault(vaultProxyAddress).getTrackedAssets();
        if (assets.length == 0) {
            return (0, true);
        }

        uint256[] memory balances = new uint256[](assets.length);
        for (uint256 i; i < assets.length; i++) {
            balances[i] = __finalizeIfSynthAndGetAssetBalance(
                vaultProxyAddress,
                assets[i],
                _requireFinality
            );
        }

        (gav_, isValid_) = IValueInterpreter(VALUE_INTERPRETER).calcCanonicalAssetsTotalValue(
            assets,
            balances,
            denominationAsset
        );

        return (gav_, isValid_);
    }

    /// @notice Calculates the gross value of 1 unit of shares in the fund's denomination asset
    /// @param _requireFinality True if all assets must have exact final balances settled
    /// @return grossShareValue_ The amount of the denomination asset per share
    /// @return isValid_ True if the conversion rates to derive the value are all valid
    /// @dev Does not account for any fees outstanding.
    function calcGrossShareValue(bool _requireFinality)
        external
        override
        returns (uint256 grossShareValue_, bool isValid_)
    {
        uint256 gav;
        (gav, isValid_) = calcGav(_requireFinality);

        grossShareValue_ = __calcGrossShareValue(
            gav,
            ERC20(vaultProxy).totalSupply(),
            10**uint256(ERC20(denominationAsset).decimals())
        );

        return (grossShareValue_, isValid_);
    }

    /// @dev Helper for calculating the gross share value
    function __calcGrossShareValue(
        uint256 _gav,
        uint256 _sharesSupply,
        uint256 _denominationAssetUnit
    ) private pure returns (uint256 grossShareValue_) {
        if (_sharesSupply == 0) {
            return _denominationAssetUnit;
        }

        return _gav.mul(SHARES_UNIT).div(_sharesSupply);
    }

    ///////////////////
    // PARTICIPATION //
    ///////////////////

    // BUY SHARES

    /// @notice Buys shares in the fund for multiple sets of criteria
    /// @param _buyers The accounts for which to buy shares
    /// @param _investmentAmounts The amounts of the fund's denomination asset
    /// with which to buy shares for the corresponding _buyers
    /// @param _minSharesQuantities The minimum quantities of shares to buy
    /// with the corresponding _investmentAmounts
    /// @return sharesReceivedAmounts_ The actual amounts of shares received
    /// by the corresponding _buyers
    /// @dev Param arrays have indexes corresponding to individual __buyShares() orders.
    function buyShares(
        address[] calldata _buyers,
        uint256[] calldata _investmentAmounts,
        uint256[] calldata _minSharesQuantities
    )
        external
        onlyNotPaused
        locksReentrance
        allowsPermissionedVaultAction
        returns (uint256[] memory sharesReceivedAmounts_)
    {
        require(_buyers.length > 0, "buyShares: Empty _buyers");
        require(
            _buyers.length == _investmentAmounts.length &&
                _buyers.length == _minSharesQuantities.length,
            "buyShares: Unequal arrays"
        );

        address vaultProxyCopy = vaultProxy;
        __assertIsActive(vaultProxyCopy);
        require(
            !IDispatcher(DISPATCHER).hasMigrationRequest(vaultProxyCopy),
            "buyShares: Pending migration"
        );

        (uint256 gav, bool gavIsValid) = calcGav(true);
        require(gavIsValid, "buyShares: Invalid GAV");

        __buySharesSetupHook(msg.sender, _investmentAmounts, gav);

        address denominationAssetCopy = denominationAsset;
        uint256 sharePrice = __calcGrossShareValue(
            gav,
            ERC20(vaultProxyCopy).totalSupply(),
            10**uint256(ERC20(denominationAssetCopy).decimals())
        );

        sharesReceivedAmounts_ = new uint256[](_buyers.length);
        for (uint256 i; i < _buyers.length; i++) {
            sharesReceivedAmounts_[i] = __buyShares(
                _buyers[i],
                _investmentAmounts[i],
                _minSharesQuantities[i],
                vaultProxyCopy,
                sharePrice,
                gav,
                denominationAssetCopy
            );

            gav = gav.add(_investmentAmounts[i]);
        }

        __buySharesCompletedHook(msg.sender, sharesReceivedAmounts_, gav);

        return sharesReceivedAmounts_;
    }

    /// @dev Helper to buy shares
    function __buyShares(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _minSharesQuantity,
        address _vaultProxy,
        uint256 _sharePrice,
        uint256 _preBuySharesGav,
        address _denominationAsset
    ) private timelockedSharesAction(_buyer) returns (uint256 sharesReceived_) {
        require(_investmentAmount > 0, "__buyShares: Empty _investmentAmount");

        // Gives Extensions a chance to run logic prior to the minting of bought shares
        __preBuySharesHook(_buyer, _investmentAmount, _minSharesQuantity, _preBuySharesGav);

        // Calculate the amount of shares to issue with the investment amount
        uint256 sharesIssued = _investmentAmount.mul(SHARES_UNIT).div(_sharePrice);

        // Mint shares to the buyer
        uint256 prevBuyerShares = ERC20(_vaultProxy).balanceOf(_buyer);
        IVault(_vaultProxy).mintShares(_buyer, sharesIssued);

        // Transfer the investment asset to the fund.
        // Does not follow the checks-effects-interactions pattern, but it is preferred
        // to have the final state of the VaultProxy prior to running __postBuySharesHook().
        ERC20(_denominationAsset).safeTransferFrom(msg.sender, _vaultProxy, _investmentAmount);

        // Gives Extensions a chance to run logic after shares are issued
        __postBuySharesHook(_buyer, _investmentAmount, sharesIssued, _preBuySharesGav);

        // The number of actual shares received may differ from shares issued due to
        // how the PostBuyShares hooks are invoked by Extensions (i.e., fees)
        sharesReceived_ = ERC20(_vaultProxy).balanceOf(_buyer).sub(prevBuyerShares);
        require(
            sharesReceived_ >= _minSharesQuantity,
            "__buyShares: Shares received < _minSharesQuantity"
        );

        emit SharesBought(msg.sender, _buyer, _investmentAmount, sharesIssued, sharesReceived_);

        return sharesReceived_;
    }

    /// @dev Helper for Extension actions after all __buyShares() calls are made
    function __buySharesCompletedHook(
        address _caller,
        uint256[] memory _sharesReceivedAmounts,
        uint256 _gav
    ) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.BuySharesCompleted,
            abi.encode(_caller, _sharesReceivedAmounts, _gav)
        );

        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.BuySharesCompleted,
            abi.encode(_caller, _sharesReceivedAmounts),
            _gav
        );
    }

    /// @dev Helper for Extension actions before any __buyShares() calls are made
    function __buySharesSetupHook(
        address _caller,
        uint256[] memory _investmentAmounts,
        uint256 _gav
    ) private {
        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.BuySharesSetup,
            abi.encode(_caller, _investmentAmounts, _gav)
        );

        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.BuySharesSetup,
            abi.encode(_caller, _investmentAmounts),
            _gav
        );
    }

    /// @dev Helper for Extension actions immediately prior to issuing shares.
    /// This could be cleaned up so both Extensions take the same encoded args and handle GAV
    /// in the same way, but there is not the obvious need for gas savings of recycling
    /// the GAV value for the current policies as there is for the fees.
    function __preBuySharesHook(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _minSharesQuantity,
        uint256 _gav
    ) private {
        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.PreBuyShares,
            abi.encode(_buyer, _investmentAmount, _minSharesQuantity),
            _gav
        );

        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.PreBuyShares,
            abi.encode(_buyer, _investmentAmount, _minSharesQuantity, _gav)
        );
    }

    /// @dev Helper for Extension actions immediately after issuing shares.
    /// Same comment applies from __preBuySharesHook() above.
    function __postBuySharesHook(
        address _buyer,
        uint256 _investmentAmount,
        uint256 _sharesIssued,
        uint256 _preBuySharesGav
    ) private {
        uint256 gav = _preBuySharesGav.add(_investmentAmount);
        IFeeManager(FEE_MANAGER).invokeHook(
            IFeeManager.FeeHook.PostBuyShares,
            abi.encode(_buyer, _investmentAmount, _sharesIssued),
            gav
        );

        IPolicyManager(POLICY_MANAGER).validatePolicies(
            address(this),
            IPolicyManager.PolicyHook.PostBuyShares,
            abi.encode(_buyer, _investmentAmount, _sharesIssued, gav)
        );
    }

    // REDEEM SHARES

    /// @notice Redeem all of the sender's shares for a proportionate slice of the fund's assets
    /// @return payoutAssets_ The assets paid out to the redeemer
    /// @return payoutAmounts_ The amount of each asset paid out to the redeemer
    /// @dev See __redeemShares() for further detail
    function redeemShares()
        external
        returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_)
    {
        return
            __redeemShares(
                msg.sender,
                ERC20(vaultProxy).balanceOf(msg.sender),
                new address[](0),
                new address[](0)
            );
    }

    /// @notice Redeem a specified quantity of the sender's shares for a proportionate slice of
    /// the fund's assets, optionally specifying additional assets and assets to skip.
    /// @param _sharesQuantity The quantity of shares to redeem
    /// @param _additionalAssets Additional (non-tracked) assets to claim
    /// @param _assetsToSkip Tracked assets to forfeit
    /// @return payoutAssets_ The assets paid out to the redeemer
    /// @return payoutAmounts_ The amount of each asset paid out to the redeemer
    /// @dev Any claim to passed _assetsToSkip will be forfeited entirely. This should generally
    /// only be exercised if a bad asset is causing redemption to fail.
    function redeemSharesDetailed(
        uint256 _sharesQuantity,
        address[] calldata _additionalAssets,
        address[] calldata _assetsToSkip
    ) external returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_) {
        return __redeemShares(msg.sender, _sharesQuantity, _additionalAssets, _assetsToSkip);
    }

    /// @dev Helper to parse an array of payout assets during redemption, taking into account
    /// additional assets and assets to skip. _assetsToSkip ignores _additionalAssets.
    /// All input arrays are assumed to be unique.
    function __parseRedemptionPayoutAssets(
        address[] memory _trackedAssets,
        address[] memory _additionalAssets,
        address[] memory _assetsToSkip
    ) private pure returns (address[] memory payoutAssets_) {
        address[] memory trackedAssetsToPayout = _trackedAssets.removeItems(_assetsToSkip);
        if (_additionalAssets.length == 0) {
            return trackedAssetsToPayout;
        }

        // Add additional assets. Duplicates of trackedAssets are ignored.
        bool[] memory indexesToAdd = new bool[](_additionalAssets.length);
        uint256 additionalItemsCount;
        for (uint256 i; i < _additionalAssets.length; i++) {
            if (!trackedAssetsToPayout.contains(_additionalAssets[i])) {
                indexesToAdd[i] = true;
                additionalItemsCount++;
            }
        }
        if (additionalItemsCount == 0) {
            return trackedAssetsToPayout;
        }

        payoutAssets_ = new address[](trackedAssetsToPayout.length.add(additionalItemsCount));
        for (uint256 i; i < trackedAssetsToPayout.length; i++) {
            payoutAssets_[i] = trackedAssetsToPayout[i];
        }
        uint256 payoutAssetsIndex = trackedAssetsToPayout.length;
        for (uint256 i; i < _additionalAssets.length; i++) {
            if (indexesToAdd[i]) {
                payoutAssets_[payoutAssetsIndex] = _additionalAssets[i];
                payoutAssetsIndex++;
            }
        }

        return payoutAssets_;
    }

    /// @dev Helper for system actions immediately prior to redeeming shares.
    /// Policy validation is not currently allowed on redemption, to ensure continuous redeemability.
    function __preRedeemSharesHook(address _redeemer, uint256 _sharesQuantity)
        private
        allowsPermissionedVaultAction
    {
        try
            IFeeManager(FEE_MANAGER).invokeHook(
                IFeeManager.FeeHook.PreRedeemShares,
                abi.encode(_redeemer, _sharesQuantity),
                0
            )
         {} catch (bytes memory reason) {
            emit PreRedeemSharesHookFailed(reason, _redeemer, _sharesQuantity);
        }
    }

    /// @dev Helper to redeem shares.
    /// This function should never fail without a way to bypass the failure, which is assured
    /// through two mechanisms:
    /// 1. The FeeManager is called with the try/catch pattern to assure that calls to it
    /// can never block redemption.
    /// 2. If a token fails upon transfer(), that token can be skipped (and its balance forfeited)
    /// by explicitly specifying _assetsToSkip.
    /// Because of these assurances, shares should always be redeemable, with the exception
    /// of the timelock period on shares actions that must be respected.
    function __redeemShares(
        address _redeemer,
        uint256 _sharesQuantity,
        address[] memory _additionalAssets,
        address[] memory _assetsToSkip
    )
        private
        locksReentrance
        returns (address[] memory payoutAssets_, uint256[] memory payoutAmounts_)
    {
        require(_sharesQuantity > 0, "__redeemShares: _sharesQuantity must be >0");
        require(
            _additionalAssets.isUniqueSet(),
            "__redeemShares: _additionalAssets contains duplicates"
        );
        require(_assetsToSkip.isUniqueSet(), "__redeemShares: _assetsToSkip contains duplicates");

        IVault vaultProxyContract = IVault(vaultProxy);

        // Only apply the sharesActionTimelock when a migration is not pending
        if (!IDispatcher(DISPATCHER).hasMigrationRequest(address(vaultProxyContract))) {
            __assertSharesActionNotTimelocked(_redeemer);
            acctToLastSharesAction[_redeemer] = block.timestamp;
        }

        // When a fund is paused, settling fees will be skipped
        if (!__fundIsPaused()) {
            // Note that if a fee with `SettlementType.Direct` is charged here (i.e., not `Mint`),
            // then those fee shares will be transferred from the user's balance rather
            // than reallocated from the sharesQuantity being redeemed.
            __preRedeemSharesHook(_redeemer, _sharesQuantity);
        }

        // Check the shares quantity against the user's balance after settling fees
        ERC20 sharesContract = ERC20(address(vaultProxyContract));
        require(
            _sharesQuantity <= sharesContract.balanceOf(_redeemer),
            "__redeemShares: Insufficient shares"
        );

        // Parse the payout assets given optional params to add or skip assets.
        // Note that there is no validation that the _additionalAssets are known assets to
        // the protocol. This means that the redeemer could specify a malicious asset,
        // but since all state-changing, user-callable functions on this contract share the
        // non-reentrant modifier, there is nowhere to perform a reentrancy attack.
        payoutAssets_ = __parseRedemptionPayoutAssets(
            vaultProxyContract.getTrackedAssets(),
            _additionalAssets,
            _assetsToSkip
        );
        require(payoutAssets_.length > 0, "__redeemShares: No payout assets");

        // Destroy the shares.
        // Must get the shares supply before doing so.
        uint256 sharesSupply = sharesContract.totalSupply();
        vaultProxyContract.burnShares(_redeemer, _sharesQuantity);

        // Calculate and transfer payout asset amounts due to redeemer
        payoutAmounts_ = new uint256[](payoutAssets_.length);
        address denominationAssetCopy = denominationAsset;
        for (uint256 i; i < payoutAssets_.length; i++) {
            uint256 assetBalance = __finalizeIfSynthAndGetAssetBalance(
                address(vaultProxyContract),
                payoutAssets_[i],
                true
            );

            // If all remaining shares are being redeemed, the logic changes slightly
            if (_sharesQuantity == sharesSupply) {
                payoutAmounts_[i] = assetBalance;
                // Remove every tracked asset, except the denomination asset
                if (payoutAssets_[i] != denominationAssetCopy) {
                    vaultProxyContract.removeTrackedAsset(payoutAssets_[i]);
                }
            } else {
                payoutAmounts_[i] = assetBalance.mul(_sharesQuantity).div(sharesSupply);
            }

            // Transfer payout asset to redeemer
            if (payoutAmounts_[i] > 0) {
                vaultProxyContract.withdrawAssetTo(payoutAssets_[i], _redeemer, payoutAmounts_[i]);
            }
        }

        emit SharesRedeemed(_redeemer, _sharesQuantity, payoutAssets_, payoutAmounts_);

        return (payoutAssets_, payoutAmounts_);
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `denominationAsset` variable
    /// @return denominationAsset_ The `denominationAsset` variable value
    function getDenominationAsset() external view override returns (address denominationAsset_) {
        return denominationAsset;
    }

    /// @notice Gets the routes for the various contracts used by all funds
    /// @return dispatcher_ The `DISPATCHER` variable value
    /// @return feeManager_ The `FEE_MANAGER` variable value
    /// @return fundDeployer_ The `FUND_DEPLOYER` variable value
    /// @return integrationManager_ The `INTEGRATION_MANAGER` variable value
    /// @return policyManager_ The `POLICY_MANAGER` variable value
    /// @return primitivePriceFeed_ The `PRIMITIVE_PRICE_FEED` variable value
    /// @return valueInterpreter_ The `VALUE_INTERPRETER` variable value
    function getLibRoutes()
        external
        view
        returns (
            address dispatcher_,
            address feeManager_,
            address fundDeployer_,
            address integrationManager_,
            address policyManager_,
            address primitivePriceFeed_,
            address valueInterpreter_
        )
    {
        return (
            DISPATCHER,
            FEE_MANAGER,
            FUND_DEPLOYER,
            INTEGRATION_MANAGER,
            POLICY_MANAGER,
            PRIMITIVE_PRICE_FEED,
            VALUE_INTERPRETER
        );
    }

    /// @notice Gets the `overridePause` variable
    /// @return overridePause_ The `overridePause` variable value
    function getOverridePause() external view returns (bool overridePause_) {
        return overridePause;
    }

    /// @notice Gets the `sharesActionTimelock` variable
    /// @return sharesActionTimelock_ The `sharesActionTimelock` variable value
    function getSharesActionTimelock() external view returns (uint256 sharesActionTimelock_) {
        return sharesActionTimelock;
    }

    /// @notice Gets the `vaultProxy` variable
    /// @return vaultProxy_ The `vaultProxy` variable value
    function getVaultProxy() external view override returns (address vaultProxy_) {
        return vaultProxy;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../utils/Proxy.sol";

/// @title ComptrollerProxy Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A proxy contract for all ComptrollerProxy instances
contract ComptrollerProxy is Proxy {
    constructor(bytes memory _constructData, address _comptrollerLib)
        public
        Proxy(_constructData, _comptrollerLib)
    {}
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 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: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../utils/IMigrationHookHandler.sol";
import "../utils/IMigratableVault.sol";
import "../vault/VaultProxy.sol";
import "./IDispatcher.sol";

/// @title Dispatcher Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice The top-level contract linking multiple releases.
/// It handles the deployment of new VaultProxy instances,
/// and the regulation of fund migration from a previous release to the current one.
/// It can also be referred to for access-control based on this contract's owner.
/// @dev DO NOT EDIT CONTRACT
contract Dispatcher is IDispatcher {
    event CurrentFundDeployerSet(address prevFundDeployer, address nextFundDeployer);

    event MigrationCancelled(
        address indexed vaultProxy,
        address indexed prevFundDeployer,
        address indexed nextFundDeployer,
        address nextVaultAccessor,
        address nextVaultLib,
        uint256 executableTimestamp
    );

    event MigrationExecuted(
        address indexed vaultProxy,
        address indexed prevFundDeployer,
        address indexed nextFundDeployer,
        address nextVaultAccessor,
        address nextVaultLib,
        uint256 executableTimestamp
    );

    event MigrationSignaled(
        address indexed vaultProxy,
        address indexed prevFundDeployer,
        address indexed nextFundDeployer,
        address nextVaultAccessor,
        address nextVaultLib,
        uint256 executableTimestamp
    );

    event MigrationTimelockSet(uint256 prevTimelock, uint256 nextTimelock);

    event NominatedOwnerSet(address indexed nominatedOwner);

    event NominatedOwnerRemoved(address indexed nominatedOwner);

    event OwnershipTransferred(address indexed prevOwner, address indexed nextOwner);

    event MigrationInCancelHookFailed(
        bytes failureReturnData,
        address indexed vaultProxy,
        address indexed prevFundDeployer,
        address indexed nextFundDeployer,
        address nextVaultAccessor,
        address nextVaultLib
    );

    event MigrationOutHookFailed(
        bytes failureReturnData,
        IMigrationHookHandler.MigrationOutHook hook,
        address indexed vaultProxy,
        address indexed prevFundDeployer,
        address indexed nextFundDeployer,
        address nextVaultAccessor,
        address nextVaultLib
    );

    event SharesTokenSymbolSet(string _nextSymbol);

    event VaultProxyDeployed(
        address indexed fundDeployer,
        address indexed owner,
        address vaultProxy,
        address indexed vaultLib,
        address vaultAccessor,
        string fundName
    );

    struct MigrationRequest {
        address nextFundDeployer;
        address nextVaultAccessor;
        address nextVaultLib;
        uint256 executableTimestamp;
    }

    address private currentFundDeployer;
    address private nominatedOwner;
    address private owner;
    uint256 private migrationTimelock;
    string private sharesTokenSymbol;
    mapping(address => address) private vaultProxyToFundDeployer;
    mapping(address => MigrationRequest) private vaultProxyToMigrationRequest;

    modifier onlyCurrentFundDeployer() {
        require(
            msg.sender == currentFundDeployer,
            "Only the current FundDeployer can call this function"
        );
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the contract owner can call this function");
        _;
    }

    constructor() public {
        migrationTimelock = 2 days;
        owner = msg.sender;
        sharesTokenSymbol = "ENZF";
    }

    /////////////
    // GENERAL //
    /////////////

    /// @notice Sets a new `symbol` value for VaultProxy instances
    /// @param _nextSymbol The symbol value to set
    function setSharesTokenSymbol(string calldata _nextSymbol) external override onlyOwner {
        sharesTokenSymbol = _nextSymbol;

        emit SharesTokenSymbolSet(_nextSymbol);
    }

    ////////////////////
    // ACCESS CONTROL //
    ////////////////////

    /// @notice Claim ownership of the contract
    function claimOwnership() external override {
        address nextOwner = nominatedOwner;
        require(
            msg.sender == nextOwner,
            "claimOwnership: Only the nominatedOwner can call this function"
        );

        delete nominatedOwner;

        address prevOwner = owner;
        owner = nextOwner;

        emit OwnershipTransferred(prevOwner, nextOwner);
    }

    /// @notice Revoke the nomination of a new contract owner
    function removeNominatedOwner() external override onlyOwner {
        address removedNominatedOwner = nominatedOwner;
        require(
            removedNominatedOwner != address(0),
            "removeNominatedOwner: There is no nominated owner"
        );

        delete nominatedOwner;

        emit NominatedOwnerRemoved(removedNominatedOwner);
    }

    /// @notice Set a new FundDeployer for use within the contract
    /// @param _nextFundDeployer The address of the FundDeployer contract
    function setCurrentFundDeployer(address _nextFundDeployer) external override onlyOwner {
        require(
            _nextFundDeployer != address(0),
            "setCurrentFundDeployer: _nextFundDeployer cannot be empty"
        );
        require(
            __isContract(_nextFundDeployer),
            "setCurrentFundDeployer: Non-contract _nextFundDeployer"
        );

        address prevFundDeployer = currentFundDeployer;
        require(
            _nextFundDeployer != prevFundDeployer,
            "setCurrentFundDeployer: _nextFundDeployer is already currentFundDeployer"
        );

        currentFundDeployer = _nextFundDeployer;

        emit CurrentFundDeployerSet(prevFundDeployer, _nextFundDeployer);
    }

    /// @notice Nominate a new contract owner
    /// @param _nextNominatedOwner The account to nominate
    /// @dev Does not prohibit overwriting the current nominatedOwner
    function setNominatedOwner(address _nextNominatedOwner) external override onlyOwner {
        require(
            _nextNominatedOwner != address(0),
            "setNominatedOwner: _nextNominatedOwner cannot be empty"
        );
        require(
            _nextNominatedOwner != owner,
            "setNominatedOwner: _nextNominatedOwner is already the owner"
        );
        require(
            _nextNominatedOwner != nominatedOwner,
            "setNominatedOwner: _nextNominatedOwner is already nominated"
        );

        nominatedOwner = _nextNominatedOwner;

        emit NominatedOwnerSet(_nextNominatedOwner);
    }

    /// @dev Helper to check whether an address is a deployed contract
    function __isContract(address _who) private view returns (bool isContract_) {
        uint256 size;
        assembly {
            size := extcodesize(_who)
        }

        return size > 0;
    }

    ////////////////
    // DEPLOYMENT //
    ////////////////

    /// @notice Deploys a VaultProxy
    /// @param _vaultLib The VaultLib library with which to instantiate the VaultProxy
    /// @param _owner The account to set as the VaultProxy's owner
    /// @param _vaultAccessor The account to set as the VaultProxy's permissioned accessor
    /// @param _fundName The name of the fund
    /// @dev Input validation should be handled by the VaultProxy during deployment
    function deployVaultProxy(
        address _vaultLib,
        address _owner,
        address _vaultAccessor,
        string calldata _fundName
    ) external override onlyCurrentFundDeployer returns (address vaultProxy_) {
        require(__isContract(_vaultAccessor), "deployVaultProxy: Non-contract _vaultAccessor");

        bytes memory constructData = abi.encodeWithSelector(
            IMigratableVault.init.selector,
            _owner,
            _vaultAccessor,
            _fundName
        );
        vaultProxy_ = address(new VaultProxy(constructData, _vaultLib));

        address fundDeployer = msg.sender;
        vaultProxyToFundDeployer[vaultProxy_] = fundDeployer;

        emit VaultProxyDeployed(
            fundDeployer,
            _owner,
            vaultProxy_,
            _vaultLib,
            _vaultAccessor,
            _fundName
        );

        return vaultProxy_;
    }

    ////////////////
    // MIGRATIONS //
    ////////////////

    /// @notice Cancels a pending migration request
    /// @param _vaultProxy The VaultProxy contract for which to cancel the migration request
    /// @param _bypassFailure True if a failure in either migration hook should be ignored
    /// @dev Because this function must also be callable by a permissioned migrator, it has an
    /// extra migration hook to the nextFundDeployer for the case where cancelMigration()
    /// is called directly (rather than via the nextFundDeployer).
    function cancelMigration(address _vaultProxy, bool _bypassFailure) external override {
        MigrationRequest memory request = vaultProxyToMigrationRequest[_vaultProxy];
        address nextFundDeployer = request.nextFundDeployer;
        require(nextFundDeployer != address(0), "cancelMigration: No migration request exists");

        // TODO: confirm that if canMigrate() does not exist but the caller is a valid FundDeployer, this still works.
        require(
            msg.sender == nextFundDeployer || IMigratableVault(_vaultProxy).canMigrate(msg.sender),
            "cancelMigration: Not an allowed caller"
        );

        address prevFundDeployer = vaultProxyToFundDeployer[_vaultProxy];
        address nextVaultAccessor = request.nextVaultAccessor;
        address nextVaultLib = request.nextVaultLib;
        uint256 executableTimestamp = request.executableTimestamp;

        delete vaultProxyToMigrationRequest[_vaultProxy];

        __invokeMigrationOutHook(
            IMigrationHookHandler.MigrationOutHook.PostCancel,
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            _bypassFailure
        );
        __invokeMigrationInCancelHook(
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            _bypassFailure
        );

        emit MigrationCancelled(
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            executableTimestamp
        );
    }

    /// @notice Executes a pending migration request
    /// @param _vaultProxy The VaultProxy contract for which to execute the migration request
    /// @param _bypassFailure True if a failure in either migration hook should be ignored
    function executeMigration(address _vaultProxy, bool _bypassFailure) external override {
        MigrationRequest memory request = vaultProxyToMigrationRequest[_vaultProxy];
        address nextFundDeployer = request.nextFundDeployer;
        require(
            nextFundDeployer != address(0),
            "executeMigration: No migration request exists for _vaultProxy"
        );
        require(
            msg.sender == nextFundDeployer,
            "executeMigration: Only the target FundDeployer can call this function"
        );
        require(
            nextFundDeployer == currentFundDeployer,
            "executeMigration: The target FundDeployer is no longer the current FundDeployer"
        );
        uint256 executableTimestamp = request.executableTimestamp;
        require(
            block.timestamp >= executableTimestamp,
            "executeMigration: The migration timelock has not elapsed"
        );

        address prevFundDeployer = vaultProxyToFundDeployer[_vaultProxy];
        address nextVaultAccessor = request.nextVaultAccessor;
        address nextVaultLib = request.nextVaultLib;

        __invokeMigrationOutHook(
            IMigrationHookHandler.MigrationOutHook.PreMigrate,
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            _bypassFailure
        );

        // Upgrade the VaultProxy to a new VaultLib and update the accessor via the new VaultLib
        IMigratableVault(_vaultProxy).setVaultLib(nextVaultLib);
        IMigratableVault(_vaultProxy).setAccessor(nextVaultAccessor);

        // Update the FundDeployer that migrated the VaultProxy
        vaultProxyToFundDeployer[_vaultProxy] = nextFundDeployer;

        // Remove the migration request
        delete vaultProxyToMigrationRequest[_vaultProxy];

        __invokeMigrationOutHook(
            IMigrationHookHandler.MigrationOutHook.PostMigrate,
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            _bypassFailure
        );

        emit MigrationExecuted(
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            nextVaultAccessor,
            nextVaultLib,
            executableTimestamp
        );
    }

    /// @notice Sets a new migration timelock
    /// @param _nextTimelock The number of seconds for the new timelock
    function setMigrationTimelock(uint256 _nextTimelock) external override onlyOwner {
        uint256 prevTimelock = migrationTimelock;
        require(
            _nextTimelock != prevTimelock,
            "setMigrationTimelock: _nextTimelock is the current timelock"
        );

        migrationTimelock = _nextTimelock;

        emit MigrationTimelockSet(prevTimelock, _nextTimelock);
    }

    /// @notice Signals a migration by creating a migration request
    /// @param _vaultProxy The VaultProxy contract for which to signal migration
    /// @param _nextVaultAccessor The account that will be the next `accessor` on the VaultProxy
    /// @param _nextVaultLib The next VaultLib library contract address to set on the VaultProxy
    /// @param _bypassFailure True if a failure in either migration hook should be ignored
    function signalMigration(
        address _vaultProxy,
        address _nextVaultAccessor,
        address _nextVaultLib,
        bool _bypassFailure
    ) external override onlyCurrentFundDeployer {
        require(
            __isContract(_nextVaultAccessor),
            "signalMigration: Non-contract _nextVaultAccessor"
        );

        address prevFundDeployer = vaultProxyToFundDeployer[_vaultProxy];
        require(prevFundDeployer != address(0), "signalMigration: _vaultProxy does not exist");

        address nextFundDeployer = msg.sender;
        require(
            nextFundDeployer != prevFundDeployer,
            "signalMigration: Can only migrate to a new FundDeployer"
        );

        __invokeMigrationOutHook(
            IMigrationHookHandler.MigrationOutHook.PreSignal,
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            _nextVaultAccessor,
            _nextVaultLib,
            _bypassFailure
        );

        uint256 executableTimestamp = block.timestamp + migrationTimelock;
        vaultProxyToMigrationRequest[_vaultProxy] = MigrationRequest({
            nextFundDeployer: nextFundDeployer,
            nextVaultAccessor: _nextVaultAccessor,
            nextVaultLib: _nextVaultLib,
            executableTimestamp: executableTimestamp
        });

        __invokeMigrationOutHook(
            IMigrationHookHandler.MigrationOutHook.PostSignal,
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            _nextVaultAccessor,
            _nextVaultLib,
            _bypassFailure
        );

        emit MigrationSignaled(
            _vaultProxy,
            prevFundDeployer,
            nextFundDeployer,
            _nextVaultAccessor,
            _nextVaultLib,
            executableTimestamp
        );
    }

    /// @dev Helper to invoke a MigrationInCancelHook on the next FundDeployer being "migrated in" to,
    /// which can optionally be implemented on the FundDeployer
    function __invokeMigrationInCancelHook(
        address _vaultProxy,
        address _prevFundDeployer,
        address _nextFundDeployer,
        address _nextVaultAccessor,
        address _nextVaultLib,
        bool _bypassFailure
    ) private {
        (bool success, bytes memory returnData) = _nextFundDeployer.call(
            abi.encodeWithSelector(
                IMigrationHookHandler.invokeMigrationInCancelHook.selector,
                _vaultProxy,
                _prevFundDeployer,
                _nextVaultAccessor,
                _nextVaultLib
            )
        );
        if (!success) {
            require(
                _bypassFailure,
                string(abi.encodePacked("MigrationOutCancelHook: ", returnData))
            );

            emit MigrationInCancelHookFailed(
                returnData,
                _vaultProxy,
                _prevFundDeployer,
                _nextFundDeployer,
                _nextVaultAccessor,
                _nextVaultLib
            );
        }
    }

    /// @dev Helper to invoke a IMigrationHookHandler.MigrationOutHook on the previous FundDeployer being "migrated out" of,
    /// which can optionally be implemented on the FundDeployer
    function __invokeMigrationOutHook(
        IMigrationHookHandler.MigrationOutHook _hook,
        address _vaultProxy,
        address _prevFundDeployer,
        address _nextFundDeployer,
        address _nextVaultAccessor,
        address _nextVaultLib,
        bool _bypassFailure
    ) private {
        (bool success, bytes memory returnData) = _prevFundDeployer.call(
            abi.encodeWithSelector(
                IMigrationHookHandler.invokeMigrationOutHook.selector,
                _hook,
                _vaultProxy,
                _nextFundDeployer,
                _nextVaultAccessor,
                _nextVaultLib
            )
        );
        if (!success) {
            require(
                _bypassFailure,
                string(abi.encodePacked(__migrationOutHookFailureReasonPrefix(_hook), returnData))
            );

            emit MigrationOutHookFailed(
                returnData,
                _hook,
                _vaultProxy,
                _prevFundDeployer,
                _nextFundDeployer,
                _nextVaultAccessor,
                _nextVaultLib
            );
        }
    }

    /// @dev Helper to return a revert reason string prefix for a given MigrationOutHook
    function __migrationOutHookFailureReasonPrefix(IMigrationHookHandler.MigrationOutHook _hook)
        private
        pure
        returns (string memory failureReasonPrefix_)
    {
        if (_hook == IMigrationHookHandler.MigrationOutHook.PreSignal) {
            return "MigrationOutHook.PreSignal: ";
        }
        if (_hook == IMigrationHookHandler.MigrationOutHook.PostSignal) {
            return "MigrationOutHook.PostSignal: ";
        }
        if (_hook == IMigrationHookHandler.MigrationOutHook.PreMigrate) {
            return "MigrationOutHook.PreMigrate: ";
        }
        if (_hook == IMigrationHookHandler.MigrationOutHook.PostMigrate) {
            return "MigrationOutHook.PostMigrate: ";
        }
        if (_hook == IMigrationHookHandler.MigrationOutHook.PostCancel) {
            return "MigrationOutHook.PostCancel: ";
        }

        return "";
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    // Provides several potentially helpful getters that are not strictly necessary

    /// @notice Gets the current FundDeployer that is allowed to deploy and migrate funds
    /// @return currentFundDeployer_ The current FundDeployer contract address
    function getCurrentFundDeployer()
        external
        view
        override
        returns (address currentFundDeployer_)
    {
        return currentFundDeployer;
    }

    /// @notice Gets the FundDeployer with which a given VaultProxy is associated
    /// @param _vaultProxy The VaultProxy instance
    /// @return fundDeployer_ The FundDeployer contract address
    function getFundDeployerForVaultProxy(address _vaultProxy)
        external
        view
        override
        returns (address fundDeployer_)
    {
        return vaultProxyToFundDeployer[_vaultProxy];
    }

    /// @notice Gets the details of a pending migration request for a given VaultProxy
    /// @param _vaultProxy The VaultProxy instance
    /// @return nextFundDeployer_ The FundDeployer contract address from which the migration
    /// request was made
    /// @return nextVaultAccessor_ The account that will be the next `accessor` on the VaultProxy
    /// @return nextVaultLib_ The next VaultLib library contract address to set on the VaultProxy
    /// @return executableTimestamp_ The timestamp at which the migration request can be executed
    function getMigrationRequestDetailsForVaultProxy(address _vaultProxy)
        external
        view
        override
        returns (
            address nextFundDeployer_,
            address nextVaultAccessor_,
            address nextVaultLib_,
            uint256 executableTimestamp_
        )
    {
        MigrationRequest memory r = vaultProxyToMigrationRequest[_vaultProxy];
        if (r.executableTimestamp > 0) {
            return (
                r.nextFundDeployer,
                r.nextVaultAccessor,
                r.nextVaultLib,
                r.executableTimestamp
            );
        }
    }

    /// @notice Gets the amount of time that must pass between signaling and executing a migration
    /// @return migrationTimelock_ The timelock value (in seconds)
    function getMigrationTimelock() external view override returns (uint256 migrationTimelock_) {
        return migrationTimelock;
    }

    /// @notice Gets the account that is nominated to be the next owner of this contract
    /// @return nominatedOwner_ The account that is nominated to be the owner
    function getNominatedOwner() external view override returns (address nominatedOwner_) {
        return nominatedOwner;
    }

    /// @notice Gets the owner of this contract
    /// @return owner_ The account that is the owner
    function getOwner() external view override returns (address owner_) {
        return owner;
    }

    /// @notice Gets the shares token `symbol` value for use in VaultProxy instances
    /// @return sharesTokenSymbol_ The `symbol` value
    function getSharesTokenSymbol()
        external
        view
        override
        returns (string memory sharesTokenSymbol_)
    {
        return sharesTokenSymbol;
    }

    /// @notice Gets the time remaining until the migration request of a given VaultProxy can be executed
    /// @param _vaultProxy The VaultProxy instance
    /// @return secondsRemaining_ The number of seconds remaining on the timelock
    function getTimelockRemainingForMigrationRequest(address _vaultProxy)
        external
        view
        override
        returns (uint256 secondsRemaining_)
    {
        uint256 executableTimestamp = vaultProxyToMigrationRequest[_vaultProxy]
            .executableTimestamp;
        if (executableTimestamp == 0) {
            return 0;
        }

        if (block.timestamp >= executableTimestamp) {
            return 0;
        }

        return executableTimestamp - block.timestamp;
    }

    /// @notice Checks whether a migration request that is executable exists for a given VaultProxy
    /// @param _vaultProxy The VaultProxy instance
    /// @return hasExecutableRequest_ True if a migration request exists and is executable
    function hasExecutableMigrationRequest(address _vaultProxy)
        external
        view
        override
        returns (bool hasExecutableRequest_)
    {
        uint256 executableTimestamp = vaultProxyToMigrationRequest[_vaultProxy]
            .executableTimestamp;

        return executableTimestamp > 0 && block.timestamp >= executableTimestamp;
    }

    /// @notice Checks whether a migration request exists for a given VaultProxy
    /// @param _vaultProxy The VaultProxy instance
    /// @return hasMigrationRequest_ True if a migration request exists
    function hasMigrationRequest(address _vaultProxy)
        external
        view
        override
        returns (bool hasMigrationRequest_)
    {
        return vaultProxyToMigrationRequest[_vaultProxy].executableTimestamp > 0;
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "../../../persistent/dispatcher/IDispatcher.sol";

/// @title DispatcherOwnerMixin Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice A mixin contract that defers ownership to the owner of Dispatcher
abstract contract DispatcherOwnerMixin {
    address internal immutable DISPATCHER;

    modifier onlyDispatcherOwner() {
        require(
            msg.sender == getOwner(),
            "onlyDispatcherOwner: Only the Dispatcher owner can call this function"
        );
        _;
    }

    constructor(address _dispatcher) public {
        DISPATCHER = _dispatcher;
    }

    /// @notice Gets the owner of this contract
    /// @return owner_ The owner
    /// @dev Ownership is deferred to the owner of the Dispatcher contract
    function getOwner() public view returns (address owner_) {
        return IDispatcher(DISPATCHER).getOwner();
    }

    ///////////////////
    // STATE GETTERS //
    ///////////////////

    /// @notice Gets the `DISPATCHER` variable
    /// @return dispatcher_ The `DISPATCHER` variable value
    function getDispatcher() external view returns (address dispatcher_) {
        return DISPATCHER;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;
    using Address for address;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;
        _decimals = 18;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal {
        _decimals = decimals_;
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../../GSN/Context.sol";
import "./ERC20.sol";

/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        uint256 decreasedAllowance = allowance(account, _msgSender()).sub(amount, "ERC20: burn amount exceeds allowance");

        _approve(account, _msgSender(), decreasedAllowance);
        _burn(account, amount);
    }
}

// SPDX-License-Identifier: GPL-3.0

/*
    This file is part of the Enzyme Protocol.

    (c) Enzyme Council <council@enzyme.finance>

    For the full license information, please view the LICENSE
    file that was distributed with this source code.
*/

pragma solidity 0.6.12;

import "./utils/EntranceRateFeeBase.sol";

/// @title EntranceRateBurnFee Contract
/// @author Enzyme Council <security@enzyme.finance>
/// @notice An EntranceRateFee that burns the fee shares
contract EntranceRateBurnFee is EntranceRateFeeBase {
    constructor(address _feeManager)
        public
        EntranceRateFeeBase(_feeManager, IFeeManager.SettlementType.Burn)
    {}

    /// @notice Provides a constant string identifier for a fee
    /// @return identifier_ The identifier string
    function identifier() external pure override returns (string memory identifier_) {
        return "ENTRANCE_RATE_BURN";
    }
}