schemeConstraint - add enableSendEth flag

contracts/schemes/SimpleSchemeConstraints.sol

@@ -9,14 +9,16 @@ contract SimpleSchemeConstraints is SchemeConstraints {
 
     mapping(address=>bool) public contractsWhiteListMap;
     bool public initialized;
+    bool public enableSendEth;
 
     /* @dev initialize
      * @param _contractsWhiteList the contracts the scheme is allowed to interact with
      * @param _descriptionHash can be used to add detalis description of the constraints.
      */
     function initialize(
         address[] calldata _contractsWhiteList,
-        string calldata _descriptionHash
+        string calldata _descriptionHash,
+        bool _enableSendEth
     )
     external {
         require(!initialized, "cannot initialize twice");
@@ -26,43 +28,52 @@ contract SimpleSchemeConstraints is SchemeConstraints {
         }
         contractsWhiteList = _contractsWhiteList;
         descriptionHash = _descriptionHash;
+        enableSendEth = _enableSendEth;
     }
 
     /*
      * @dev isAllowedToCall should be called upon a proposal execution.
      * @param _contractsToCall the contracts to be called
+     * @param _values value(ETH) to transfer with the calls
      * @return bool value true-allowed false not allowed
      */
     function isAllowedToCall(
         address[] calldata _contractsToCall,
         bytes[] calldata,
-        uint256[] calldata,
+        uint256[] calldata  _values,
         Avatar
     )
     external
     returns(bool)
     {
         for (uint i = 0; i < _contractsToCall.length; i++) {
             require(contractsWhiteListMap[_contractsToCall[i]], "contract not whitelisted");
+            if (!enableSendEth) {
+                require(_values[i] == 0, "sending eth is not allowed");
+            }
         }
         return true;
     }
 
     /*
      * @dev isAllowedToPropose should be called upon a proposal submition.
      * @param _contractsToCall the contracts to be called
+     * @param _values value(ETH) to transfer with the calls
      * @return bool value true-allowed false not allowed
      */
     function isAllowedToPropose(
         address[] calldata _contractsToCall,
         bytes[] calldata,
-        uint256[] calldata,
+        uint256[] calldata _values,
         Avatar)
     external
     returns(bool)
     {
         for (uint i = 0; i < _contractsToCall.length; i++) {
             require(contractsWhiteListMap[_contractsToCall[i]], "contract not whitelisted");
+            if (!enableSendEth) {
+                require(_values[i] == 0, "sending eth is not allowed");
+            }
         }
         return true;
     }

contracts/utils/GenericSchemeMultiCallFactory.sol

@@ -22,14 +22,16 @@ contract GenericSchemeMultiCallFactory {
         uint256[11] memory _votingParams,
         address _voteOnBehalf,
         address[] memory _contractsWhiteList,
+        bool _enableSendEth,
         string memory _descriptionHash
     ) public returns(address) {
         require(_voteParamsType < 4, "Vote params type specified does not exist");
         GenericSchemeMultiCall genericSchemeMultiCall = new GenericSchemeMultiCall();
         address simpleSchemeConstraints;
         if (_contractsWhiteList.length > 0) {
             simpleSchemeConstraints = address(new SimpleSchemeConstraints());
-            SimpleSchemeConstraints(simpleSchemeConstraints).initialize(_contractsWhiteList, _descriptionHash);
+            SimpleSchemeConstraints(simpleSchemeConstraints)
+            .initialize(_contractsWhiteList, _descriptionHash, _enableSendEth);
         }
         uint256[11] memory voteParams;
         if (_voteParamsType == CUSTOM) {