Merge pull request #392 from maticnetwork/mrc-fix

fix: remove transferWithSig in MRC20

Author: jdkanani

contracts/child/BaseERC20NoSig.sol

@@ -0,0 +1,72 @@
+pragma solidity ^0.5.2;
+
+import "./ChildToken.sol";
+
+contract BaseERC20NoSig is ChildToken {
+    event Deposit(
+        address indexed token,
+        address indexed from,
+        uint256 amount,
+        uint256 input1,
+        uint256 output1
+    );
+
+    event Withdraw(
+        address indexed token,
+        address indexed from,
+        uint256 amount,
+        uint256 input1,
+        uint256 output1
+    );
+
+    event LogTransfer(
+        address indexed token,
+        address indexed from,
+        address indexed to,
+        uint256 amount,
+        uint256 input1,
+        uint256 input2,
+        uint256 output1,
+        uint256 output2
+    );
+
+    constructor() public {}
+
+    function transferWithSig(
+        bytes calldata sig,
+        uint256 amount,
+        bytes32 data,
+        uint256 expiration,
+        address to
+    ) external returns (address from) {
+        revert("Disabled feature");
+    }
+
+    function balanceOf(address account) external view returns (uint256);
+    function _transfer(address sender, address recipient, uint256 amount)
+        internal;
+
+    /// @param from Address from where tokens are withdrawn.
+    /// @param to Address to where tokens are sent.
+    /// @param value Number of tokens to transfer.
+    /// @return Returns success of function call.
+    function _transferFrom(address from, address to, uint256 value)
+        internal
+        returns (bool)
+    {
+        uint256 input1 = this.balanceOf(from);
+        uint256 input2 = this.balanceOf(to);
+        _transfer(from, to, value);
+        emit LogTransfer(
+            token,
+            from,
+            to,
+            value,
+            input1,
+            input2,
+            this.balanceOf(from),
+            this.balanceOf(to)
+        );
+        return true;
+    }
+}

contracts/child/MRC20.sol

@@ -1,13 +1,13 @@
 pragma solidity ^0.5.11;
 
-import "./BaseERC20.sol";
+import "./BaseERC20NoSig.sol";
 
 /**
  * @title Matic token contract
  * @notice This contract is an ECR20 like wrapper over native ether (matic token) transfers on the matic chain
  * @dev ERC20 methods have been made payable while keeping their method signature same as other ChildERC20s on Matic
  */
-contract MRC20 is BaseERC20 {
+contract MRC20 is BaseERC20NoSig {
     event Transfer(address indexed from, address indexed to, uint256 value);
 
     uint256 public currentSupply = 0;