[FEATURE DONE] add raf token receiver

src/periphery/RafTokenReceiver.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+pragma solidity 0.8.14;
+
+import { Owned } from "solmate/src/auth/Owned.sol";
+
+/**
+ * @title RafTokenReceiver
+ * @author CyberConnect
+ * @notice A contract that receive native token and record the amount.
+ */
+contract RafTokenReceiver is Owned {
+    /*//////////////////////////////////////////////////////////////
+                                STATES
+    //////////////////////////////////////////////////////////////*/
+
+    mapping(address => uint256) public deposits;
+    uint256 public requiredAmount;
+
+    /*//////////////////////////////////////////////////////////////
+                                 EVENT
+    //////////////////////////////////////////////////////////////*/
+
+    event RafDeposit(address from, uint256 amount);
+    event RafWithdraw(address to, uint256 amount);
+    event RafUpdateRequiredAmount(uint256 amount);
+
+    /*//////////////////////////////////////////////////////////////
+                                 CONSTRUCTOR
+    //////////////////////////////////////////////////////////////*/
+
+    constructor(address owner, uint256 amount) Owned(owner) {
+        require(amount > 0, "INVALID_AMOUNT");
+        requiredAmount = amount;
+    }
+
+    /*//////////////////////////////////////////////////////////////
+                                 EXTERNAL
+    //////////////////////////////////////////////////////////////*/
+
+    function deposit() external payable {
+        require(msg.value == requiredAmount, "WRONG_AMOUNT");
+        deposits[msg.sender] += msg.value;
+        emit RafDeposit(msg.sender, msg.value);
+    }
+
+    function withdraw(uint256 amount) external onlyOwner {
+        payable(owner).transfer(amount);
+        emit RafWithdraw(owner, amount);
+    }
+
+    function setRequiredAmount(uint256 newAmount) external onlyOwner {
+        require(newAmount > 0, "INVALID_AMOUNT");
+        emit RafUpdateRequiredAmount(newAmount);
+        requiredAmount = newAmount;
+    }
+}