82 lines
2.5 KiB
Solidity
82 lines
2.5 KiB
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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interface IChainlinkOracle {
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function decimals() external view returns (uint8 decimal);
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function latestAnswer() external view returns (int answer);
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}
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interface IOffchainOracle {
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function getRateToEth(address srcToken, bool useSrcWrappers) external view returns (uint256 weightedRate);
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}
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contract TestnetOracle {
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address public stablecoin;
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mapping(address => IChainlinkOracle) public chainlinkOracles;
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mapping(address => bool) public isStablecoin;
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mapping(address => uint256) public arbitraryPrice;
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address public owner;
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error NotOwner();
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modifier onlyOwner() {
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if (msg.sender != owner) {
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revert NotOwner();
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}
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_;
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}
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constructor(address _stablecoin, address _stablecoinOracle) {
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stablecoin = _stablecoin;
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isStablecoin[_stablecoin] = true;
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chainlinkOracles[_stablecoin] = IChainlinkOracle(_stablecoinOracle);
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owner = msg.sender;
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}
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function changeOwner(address newOwner) external onlyOwner {
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owner = newOwner;
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}
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function changeArbitraryPrice(address token, uint256 price) external onlyOwner {
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arbitraryPrice[token] = price;
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}
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function setOracle(address token, address oracle, bool _isStablecoin) external onlyOwner {
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if (_isStablecoin) {
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isStablecoin[token] = true;
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}
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chainlinkOracles[token] = IChainlinkOracle(oracle);
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}
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// USD/TOKEN from Chainlink
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function getOracleUSD(address token) public view returns (uint256) {
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IChainlinkOracle oracle = chainlinkOracles[token];
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(uint8 oracleDecimals, uint256 oracleAnswer) = (oracle.decimals(), uint256(oracle.latestAnswer()));
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return (10 ** (18 + oracleDecimals) / oracleAnswer);
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}
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// Wrap around OffchainOracle function to get compatible rates from testnet chainlink oracles (which is the same as market rate)
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function getRateToEth(address srcToken, bool useSrcWrappers) external view returns (uint256) {
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if (address(chainlinkOracles[srcToken]) == address(0)) {
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return arbitraryPrice[srcToken];
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}
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uint8 tokenDecimals = IChainlinkOracle(srcToken).decimals();
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if (isStablecoin[srcToken]) {
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return getOracleUSD(srcToken) * 10 ** (18 - tokenDecimals);
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}
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uint256 usdEth = getOracleUSD(stablecoin);
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return usdEth * (10 ** (18 + 18 - tokenDecimals)) / getOracleUSD(srcToken);
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}
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}
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