Merge pull request #286 from vzotova/free-fee-model

Free fee model

contracts/contracts/coordination/FreeFeeModel.sol

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+pragma solidity ^0.8.0;
+
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+/**
+ * @title FreeFeeModel
+ * @notice Free FeeModel
+ */
+contract FreeFeeModel is Ownable {
+    mapping(address initiator => bool approved) public initiatorWhiteList;
+
+    constructor() Ownable(msg.sender) {}
+
+    function approveInitiator(address initiator) external onlyOwner {
+        initiatorWhiteList[initiator] = true;
+    }
+
+    function processRitualPayment(address initiator, uint32, uint256, uint32) external {
+        require(initiatorWhiteList[initiator], "Initiator not approved");
+    }
+
+    function processRitualExtending(address initiator, uint32, uint256, uint32) external {
+        require(initiatorWhiteList[initiator], "Initiator not approved");
+    }
+
+    function beforeSetAuthorization(
+        uint32 ritualId,
+        address[] calldata addresses,
+        bool value
+    ) external {
+        // solhint-disable-previous-line no-empty-blocks
+    }
+
+    function beforeIsAuthorized(uint32 ritualId) external view {
+        // solhint-disable-previous-line no-empty-blocks
+    }
+}

contracts/contracts/coordination/IFeeModel.sol

@@ -2,8 +2,6 @@
 
 pragma solidity ^0.8.0;
 
-import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-
 /**
  * @title IFeeModel
  * @notice IFeeModel