Add Manager permissions for protected modules and extensions (#71)

* Make fee extension setters use mutualUpgrade

* Add BaseManagerV2 with module protection methods

* Update tests for new BaseManager 

* StreamingFeeSplitExtension: add configurable operatorFeeRecipient

* FeeSplitAdapter: add configurable operatorFeeRecipient

* Send fees to fee extension

* Update all specs to use BaseManagerV2

* Rename FeeSplitAdapter --> FeeSplitExtension

* Add initialize method to StreamingFeeSplitExtension contract

* Add initialize methods to FeeSplitExtension contract

Author: cgewecke

contracts/adapters/FeeSplitAdapter.sol

@@ -0,0 +1,243 @@
+/*
+    Copyright 2021 IndexCooperative
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+pragma solidity 0.6.10;
+pragma experimental ABIEncoderV2;
+
+import { Address } from "@openzeppelin/contracts/utils/Address.sol";
+import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
+
+import { BaseExtension } from "../lib/BaseExtension.sol";
+import { IIssuanceModule } from "../interfaces/IIssuanceModule.sol";
+import { IBaseManager } from "../interfaces/IBaseManager.sol";
+import { ISetToken } from "../interfaces/ISetToken.sol";
+import { IStreamingFeeModule } from "../interfaces/IStreamingFeeModule.sol";
+import { PreciseUnitMath } from "../lib/PreciseUnitMath.sol";
+import { TimeLockUpgrade } from "../lib/TimeLockUpgrade.sol";
+import { MutualUpgrade } from "../lib/MutualUpgrade.sol";
+
+
+/**
+ * @title FeeSplitExtension
+ * @author Set Protocol
+ *
+ * Smart contract extension that allows for splitting and setting streaming and mint/redeem fees.
+ */
+contract FeeSplitExtension is BaseExtension, TimeLockUpgrade, MutualUpgrade {
+    using Address for address;
+    using PreciseUnitMath for uint256;
+    using SafeMath for uint256;
+
+    /* ============ Events ============ */
+
+    event FeesDistributed(
+        address indexed _operatorFeeRecipient,
+        address indexed _methodologist,
+        uint256 _operatorTake,
+        uint256 _methodologistTake
+    );
+
+    /* ============ State Variables ============ */
+
+    ISetToken public setToken;
+    IStreamingFeeModule public streamingFeeModule;
+    IIssuanceModule public issuanceModule;
+
+    // Percent of fees in precise units (10^16 = 1%) sent to operator, rest to methodologist
+    uint256 public operatorFeeSplit;
+
+    // Address which receives operator's share of fees when they're distributed. (See IIP-72)
+    address public operatorFeeRecipient;
+
+    /* ============ Constructor ============ */
+
+    constructor(
+        IBaseManager _manager,
+        IStreamingFeeModule _streamingFeeModule,
+        IIssuanceModule _issuanceModule,
+        uint256 _operatorFeeSplit,
+        address _operatorFeeRecipient
+    )
+        public
+        BaseExtension(_manager)
+    {
+        streamingFeeModule = _streamingFeeModule;
+        issuanceModule = _issuanceModule;
+        operatorFeeSplit = _operatorFeeSplit;
+        operatorFeeRecipient = _operatorFeeRecipient;
+        setToken = manager.setToken();
+    }
+
+    /* ============ External Functions ============ */
+
+    /**
+     * ANYONE CALLABLE: Accrues fees from streaming fee module. Gets resulting balance after fee accrual, calculates fees for
+     * operator and methodologist, and sends to operator fee recipient and methodologist respectively. NOTE: mint/redeem fees
+     * will automatically be sent to this address so reading the balance of the SetToken in the contract after accrual is
+     * sufficient for accounting for all collected fees.
+     */
+    function accrueFeesAndDistribute() public {
+        // Emits a FeeActualized event
+        streamingFeeModule.accrueFee(setToken);
+
+        uint256 totalFees = setToken.balanceOf(address(this));
+
+        address methodologist = manager.methodologist();
+
+        uint256 operatorTake = totalFees.preciseMul(operatorFeeSplit);
+        uint256 methodologistTake = totalFees.sub(operatorTake);
+
+        if (operatorTake > 0) {
+            setToken.transfer(operatorFeeRecipient, operatorTake);
+        }
+
+        if (methodologistTake > 0) {
+            setToken.transfer(methodologist, methodologistTake);
+        }
+
+        emit FeesDistributed(operatorFeeRecipient, methodologist, operatorTake, methodologistTake);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Initializes the issuance module. Operator and Methodologist must each call
+     * this function to execute the update.
+     *
+     * This method is called after invoking `replaceProtectedModule` or `emergencyReplaceProtectedModule`
+     * to configure the replacement streaming fee module's fee settings.
+     */
+    function initializeIssuanceModule(
+        ISetToken _setToken,
+        uint256 _maxManagerFee,
+        uint256 _managerIssueFee,
+        uint256 _managerRedeemFee,
+        address _feeRecipient,
+        address _managerIssuanceHook
+    )
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+    {
+        bytes memory callData = abi.encodeWithSelector(
+            IIssuanceModule.initialize.selector,
+            manager.setToken(),
+            _maxManagerFee,
+            _managerIssueFee,
+            _managerRedeemFee,
+            _feeRecipient,
+            _managerIssuanceHook
+        );
+
+        invokeManager(address(issuanceModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Initializes the issuance module. Operator and Methodologist must each call
+     * this function to execute the update.
+     *
+     * This method is called after invoking `replaceProtectedModule` or `emergencyReplaceProtectedModule`
+     * to configure the replacement streaming fee module's fee settings.
+     */
+    function initializeStreamingFeeModule(IStreamingFeeModule.FeeState memory _settings)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+    {
+        bytes memory callData = abi.encodeWithSelector(
+            IStreamingFeeModule.initialize.selector,
+            manager.setToken(),
+            _settings
+        );
+
+        invokeManager(address(streamingFeeModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Updates streaming fee on StreamingFeeModule. Operator and Methodologist must each call
+     * this function to execute the update. Because the method is timelocked, each party must call it twice:
+     * once to set the lock and once to execute.
+     *
+     * NOTE: This will accrue streaming fees though not send to operator fee recipient and methodologist.
+     */
+    function updateStreamingFee(uint256 _newFee)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+        timeLockUpgrade
+    {
+        bytes memory callData = abi.encodeWithSignature("updateStreamingFee(address,uint256)", manager.setToken(), _newFee);
+        invokeManager(address(streamingFeeModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Updates issue fee on IssuanceModule. Only is executed once time lock has passed.
+     * Operator and Methodologist must each call this function to execute the update. Because the method
+     * is timelocked, each party must call it twice: once to set the lock and once to execute.
+     */
+    function updateIssueFee(uint256 _newFee)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+        timeLockUpgrade
+    {
+        bytes memory callData = abi.encodeWithSignature("updateIssueFee(address,uint256)", manager.setToken(), _newFee);
+        invokeManager(address(issuanceModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Updates redeem fee on IssuanceModule. Only is executed once time lock has passed.
+     * Operator and Methodologist must each call this function to execute the update. Because the method is
+     * timelocked, each party must call it twice: once to set the lock and once to execute.
+     */
+    function updateRedeemFee(uint256 _newFee)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+        timeLockUpgrade
+    {
+        bytes memory callData = abi.encodeWithSignature("updateRedeemFee(address,uint256)", manager.setToken(), _newFee);
+        invokeManager(address(issuanceModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Updates fee recipient on both streaming fee and issuance modules.
+     */
+    function updateFeeRecipient(address _newFeeRecipient)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+    {
+        bytes memory callData = abi.encodeWithSignature("updateFeeRecipient(address,address)", manager.setToken(), _newFeeRecipient);
+        invokeManager(address(streamingFeeModule), callData);
+        invokeManager(address(issuanceModule), callData);
+    }
+
+    /**
+     * MUTUAL UPGRADE: Updates fee split between operator and methodologist. Split defined in precise units (1% = 10^16).
+     */
+    function updateFeeSplit(uint256 _newFeeSplit)
+        external
+        mutualUpgrade(manager.operator(), manager.methodologist())
+    {
+        require(_newFeeSplit <= PreciseUnitMath.preciseUnit(), "Fee must be less than 100%");
+        accrueFeesAndDistribute();
+        operatorFeeSplit = _newFeeSplit;
+    }
+
+    /**
+     * OPERATOR ONLY: Updates the address that receives the operator's share of the fees (see IIP-72)
+     */
+    function updateOperatorFeeRecipient(address _newOperatorFeeRecipient)
+        external
+        onlyOperator
+    {
+        require(_newOperatorFeeRecipient != address(0), "Zero address not valid");
+        operatorFeeRecipient = _newOperatorFeeRecipient;
+    }
+}