From 2b65c25fd58430a48ca1b9420d269e8664207a23 Mon Sep 17 00:00:00 2001
From: richance <33940018+richance@users.noreply.github.com>
Date: Thu, 26 Aug 2021 11:58:13 +0400
Subject: [PATCH] Created OpenOracleFrameworkOracle.sol

Integration of OpenOracleFramework
for Oracle
---
 .../oracles/OpenOracleFrameworkOracle.sol     | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 contracts/oracles/OpenOracleFrameworkOracle.sol

diff --git a/contracts/oracles/OpenOracleFrameworkOracle.sol b/contracts/oracles/OpenOracleFrameworkOracle.sol
new file mode 100644
index 0000000..643b545
--- /dev/null
+++ b/contracts/oracles/OpenOracleFrameworkOracle.sol
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: MIT
+// Using the same Copyleft License as in the original Repository
+pragma solidity 0.6.12;
+import "@boringcrypto/boring-solidity/contracts/libraries/BoringMath.sol";
+import "../interfaces/IOracle.sol";
+
+// Open Oracle Framework Interface
+interface IOpenOracleFramework {
+    function getFeed(uint256 feedID) external view returns (uint256, uint256, uint256);
+}
+
+// Open Oracle Framework TWAP Interface
+interface IOpenOracleFrameworkTWAP {
+    function getTWAP(
+        address OOFContract,
+        uint256[] memory feedIDs,
+        uint256[] memory timestampstart,
+        uint256[] memory timestampfinish,
+        bool strictMode)
+    external view returns (uint256[] memory TWAP);
+}
+
+contract OpenOracleFramework is IOracle {
+    using BoringMath for uint256; // Keep everything in uint256
+
+    // Calculates the latest rate
+    function _get(
+        address oracle,
+        uint256 feedId
+    ) internal view returns (uint256) {
+        uint256 price;
+        uint256 decimals;
+        (price, , decimals) = IOpenOracleFramework(oracle).getFeed(feedId);
+        return price / decimals;
+    }
+
+    // Calculates the 24h TWAP rate
+    function _getTWAP(
+        address twap,
+        address oracle,
+        uint256 feedId
+    ) internal view returns (uint256) {
+
+        uint256 decimals;
+        (,,decimals) = IOpenOracleFramework(oracle).getFeed(feedId);
+
+        uint256[] memory feedIdInput = new uint256[](1);
+        uint256[] memory twapStart = new uint256[](1);
+        uint256[] memory twapEnd = new uint256[](1);
+
+        feedIdInput[0] = feedId;
+        twapStart[0] = block.timestamp - 60*60*24;
+        twapEnd[0] = block.timestamp;
+
+        uint256 price = IOpenOracleFrameworkTWAP(twap).getTWAP(oracle,feedIdInput,twapStart,twapEnd,false)[0];
+        return price / decimals;
+    }
+
+    function getDataParameter(
+        address multiply,
+        address divide,
+        uint256 decimals
+    ) public pure returns (bytes memory) {
+        return abi.encode(multiply, divide, decimals);
+    }
+
+    // Get the latest exchange rate
+    /// @inheritdoc IOracle
+    function get(bytes calldata data) public override returns (bool, uint256) {
+        (address oracle, uint256 feedId) = abi.decode(data, (address, uint256));
+        return (true, _get(oracle, feedId));
+    }
+
+    // Check the last exchange rate without any state changes
+    /// @inheritdoc IOracle
+    function peek(bytes calldata data) public view override returns (bool, uint256) {
+        (address twap, address oracle, uint256 feedId) = abi.decode(data, (address, address, uint256));
+        return (true, _getTWAP(twap, oracle, feedId));
+    }
+
+    // Check the current spot exchange rate without any state changes
+    /// @inheritdoc IOracle
+    function peekSpot(bytes calldata data) external view override returns (uint256 rate) {
+        (address oracle, uint256 feedId) = abi.decode(data, (address, uint256));
+        return _get(oracle, feedId);
+    }
+
+    /// @inheritdoc IOracle
+    function name(bytes calldata) public view override returns (string memory) {
+        return "Open Oracle Framework";
+    }
+
+    /// @inheritdoc IOracle
+    function symbol(bytes calldata) public view override returns (string memory) {
+        return "OOF";
+    }
+}