new oracle

contracts/helper/BandBNBBUSDPriceOracleProxy.sol

@@ -0,0 +1,30 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+interface IBandOracleAggregator {
+    function getReferenceData(string memory base, string memory quote)
+        external
+        view
+        returns (uint256);
+}
+
+
+contract BandBNBBUSDPriceOracleProxy {
+    IBandOracleAggregator public aggregator;
+
+    constructor(IBandOracleAggregator _aggregator) public {
+        aggregator = _aggregator;
+    }
+
+    function getPrice() public view returns (uint256) {
+        return aggregator.getReferenceData("BNB", "USD");
+    }
+}

contracts/helper/ConstOracle.sol

@@ -0,0 +1,22 @@
+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+pragma experimental ABIEncoderV2;
+
+
+contract ConstOracle {
+    uint256 public tokenPrice;
+
+    constructor(uint256 _price) public {
+        tokenPrice = _price;
+    }
+
+    function getPrice() external view returns (uint256) {
+        return tokenPrice;
+    }
+}