burned fee locker/recycler

contracts/democracy/BurnedFeeLocker.sol

@@ -0,0 +1,46 @@
+pragma solidity ^0.4.17;
+
+import "../token/MiniMeToken.sol";
+import "../token/ApproveAndCallFallBack.sol";
+
+contract BurnedFeeLocker is ApproveAndCallFallBack {
+
+    address public SNT;
+    address public recyclerManager;
+    mapping (address => uint256) burnedFee;
+    uint256 availableToRecycle;
+
+    function BurnedFeeLocker(address _recyclerManager, address _SNT) public { 
+        SNT = _SNT;
+        recyclerManager = _recyclerManager;
+    }
+
+    function recycleFee(address _from, address _to, uint256 _amount) external {
+        require(msg.sender == recyclerManager);
+        require(burnedFee[_from] >= _amount);
+        MiniMeToken(SNT).approveAndCall(_to, _amount, new bytes(0));
+        availableToRecycle -= _amount;
+    }
+
+    function withdrawToken(address _token, address _to) external {
+        require(msg.sender == recyclerManager);
+        uint256 available = MiniMeToken(_token).balanceOf(address(this));
+        if (_token == SNT) {
+            available -= availableToRecycle;
+        }
+        if (available > 0) {
+            MiniMeToken(_token).transfer(_to, available);
+        }
+    }
+
+    function receiveApproval(address _from, uint256 _amount, address _token, bytes _data) public {
+        require(_token == SNT);
+        if (_amount == 0 || _data.length > 0) {
+            require(msg.sender == _token);
+        }
+        if (MiniMeToken(SNT).transferFrom(_from, address(this), _amount)) {
+            burnedFee[_from] += _amount;
+            availableToRecycle += _amount;
+        }
+    }
+}