helper oracles

contracts/helper/MinimumOracle.sol

@@ -0,0 +1,56 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IMinimumOracle {
+    function getPrice() external view returns (uint256);
+
+    function setPrice(uint256 newPrice) external;
+
+    function transferOwnership(address newOwner) external;
+}
+
+
+contract MinimumOracle {
+    address public _OWNER_;
+    uint256 public tokenPrice;
+
+    // ============ Events ============
+
+    event OwnershipTransfer(address indexed previousOwner, address indexed newOwner);
+
+    // ============ Modifiers ============
+
+    modifier onlyOwner() {
+        require(msg.sender == _OWNER_, "NOT_OWNER");
+        _;
+    }
+
+    // ============ Functions ============
+
+    constructor() public {
+        _OWNER_ = msg.sender;
+        emit OwnershipTransfer(address(0), _OWNER_);
+    }
+
+    function transferOwnership(address newOwner) external onlyOwner {
+        require(newOwner != address(0), "INVALID_OWNER");
+        emit OwnershipTransfer(_OWNER_, newOwner);
+        _OWNER_ = newOwner;
+    }
+
+    function setPrice(uint256 newPrice) external onlyOwner {
+        tokenPrice = newPrice;
+    }
+
+    function getPrice() external view returns (uint256) {
+        return tokenPrice;
+    }
+}