DODO Migration to BSC

contracts/DODOToken/DODOMigrationBSC.sol

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+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+import {IERC20} from "../intf/IERC20.sol";
+import {SafeMath} from "../lib/SafeMath.sol";
+import {Ownable} from "../lib/Ownable.sol";
+
+contract DODOMigrationBSC is Ownable {
+    using SafeMath for uint256;
+
+    // ============ Storage ============
+
+    address immutable _ETH_DODO_TOKEN_ = 0x43Dfc4159D86F3A37A5A4B3D4580b888ad7d4DDd;
+    address immutable _BSC_DODO_TOKEN_ = 0xa6E37b1d3690C8E608Bb11AFE193fA7C88141643;
+    mapping(address => uint256) internal balances;
+
+    bool public _IS_ETH_NETWORK_;
+
+    constructor(bool isETHNetwork) public {
+        _IS_ETH_NETWORK_ = isETHNetwork;
+    }
+
+    // ============ Events ============
+
+    event Lock(address indexed sender, address indexed mintTo, uint256 amount);
+    event Unlock(address indexed to, uint256 amount);
+
+    // ============ Functions ============
+
+    function lock(uint256 amount, address mintTo) external {
+        address dodoToken = _IS_ETH_NETWORK_ ? _ETH_DODO_TOKEN_ : _BSC_DODO_TOKEN_;
+        IERC20(dodoToken).transferFrom(msg.sender, address(this), amount);
+        balances[msg.sender] = balances[msg.sender].add(amount);
+        emit Lock(msg.sender, mintTo, amount);
+    }
+
+    function unlock(address unlockTo, uint256 amount) external onlyOwner {
+        address dodoToken = _IS_ETH_NETWORK_ ? _ETH_DODO_TOKEN_ : _BSC_DODO_TOKEN_;
+        require(balances[unlockTo] >= amount);
+        balances[unlockTo] = balances[unlockTo].sub(amount);
+        IERC20(dodoToken).transfer(unlockTo, amount);
+        emit Unlock(unlockTo, amount);
+    }
+}