Contract 0xa5a095f2a2beb2d53382293b0ffe0f520ddec297

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.9;

import "./interfaces/AggregatorV3Interface.sol";

import "./libraries/AccessControl.sol";

/**
 *  @title Contract used for accessing exchange rates using chainlink price feeds
 *  @dev Interacts with chainlink price feeds and services all contracts in the system for price data.
 */
contract PriceFeed is AccessControl {
	/////////////////////////////////////
	/// governance settable variables ///
	/////////////////////////////////////

	mapping(address => mapping(address => address)) public priceFeeds;

	//////////////////////////
	/// constant variables ///
	//////////////////////////

	uint8 private constant SCALE_DECIMALS = 18;
	// seconds since the last price feed update until we deem the data to be stale
	uint32 private constant STALE_PRICE_DELAY = 3600;

	constructor(address _authority) AccessControl(IAuthority(_authority)) {}

	///////////////
	/// setters ///
	///////////////

	function addPriceFeed(
		address underlying,
		address strike,
		address feed
	) public {
		_onlyGovernor();
		priceFeeds[underlying][strike] = feed;
	}

	///////////////////////
	/// complex getters ///
	///////////////////////

	function getRate(address underlying, address strike) external view returns (uint256) {
		address feedAddress = priceFeeds[underlying][strike];
		require(feedAddress != address(0), "Price feed does not exist");
		AggregatorV3Interface feed = AggregatorV3Interface(feedAddress);
		(uint80 roundId, int256 rate, , uint256 timestamp, uint80 answeredInRound) = feed
			.latestRoundData();
		require(rate > 0, "ChainLinkPricer: price is lower than 0");
		require(timestamp != 0, "ROUND_NOT_COMPLETE");
		require(block.timestamp <= timestamp + STALE_PRICE_DELAY, "STALE_PRICE");
		require(answeredInRound >= roundId, "STALE_PRICE");
		return uint256(rate);
	}

	/// @dev get the rate from chainlink and convert it to e18 decimals
	function getNormalizedRate(address underlying, address strike) external view returns (uint256) {
		address feedAddress = priceFeeds[underlying][strike];
		require(feedAddress != address(0), "Price feed does not exist");
		AggregatorV3Interface feed = AggregatorV3Interface(feedAddress);
		uint8 feedDecimals = feed.decimals();
		(uint80 roundId, int256 rate, , uint256 timestamp, uint80 answeredInRound) = feed
			.latestRoundData();
		require(rate > 0, "ChainLinkPricer: price is lower than 0");
		require(timestamp != 0, "ROUND_NOT_COMPLETE");
		require(block.timestamp <= timestamp + STALE_PRICE_DELAY, "STALE_PRICE");
		require(answeredInRound >= roundId, "STALE_PRICE_ROUND");
		uint8 difference;
		if (SCALE_DECIMALS > feedDecimals) {
			difference = SCALE_DECIMALS - feedDecimals;
			return uint256(rate) * (10**difference);
		}
		difference = feedDecimals - SCALE_DECIMALS;
		return uint256(rate) / (10**difference);
	}
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.6.0;

interface AggregatorV3Interface {
	function decimals() external view returns (uint8);

	function description() external view returns (string memory);

	function version() external view returns (uint256);

	// getRoundData and latestRoundData should both raise "No data present"
	// if they do not have data to report, instead of returning unset values
	// which could be misinterpreted as actual reported values.
	function getRoundData(uint80 _roundId)
		external
		view
		returns (
			uint80 roundId,
			int256 answer,
			uint256 startedAt,
			uint256 updatedAt,
			uint80 answeredInRound
		);

	function latestRoundData()
		external
		view
		returns (
			uint80 roundId,
			int256 answer,
			uint256 startedAt,
			uint256 updatedAt,
			uint80 answeredInRound
		);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0;

import "../interfaces/IAuthority.sol";

error UNAUTHORIZED();

/**
 *  @title Contract used for access control functionality, based off of OlympusDao Access Control
 */
abstract contract AccessControl {
	/* ========== EVENTS ========== */

	event AuthorityUpdated(IAuthority authority);

	/* ========== STATE VARIABLES ========== */

	IAuthority public authority;

	/* ========== Constructor ========== */

	constructor(IAuthority _authority) {
		authority = _authority;
		emit AuthorityUpdated(_authority);
	}

	/* ========== GOV ONLY ========== */

	function setAuthority(IAuthority _newAuthority) external {
		_onlyGovernor();
		authority = _newAuthority;
		emit AuthorityUpdated(_newAuthority);
	}

	/* ========== INTERNAL CHECKS ========== */

	function _onlyGovernor() internal view {
		if (msg.sender != authority.governor()) revert UNAUTHORIZED();
	}

	function _onlyGuardian() internal view {
		if (!authority.guardian(msg.sender) && msg.sender != authority.governor()) revert UNAUTHORIZED();
	}

	function _onlyManager() internal view {
		if (msg.sender != authority.manager() && msg.sender != authority.governor())
			revert UNAUTHORIZED();
	}
}

// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.8.0;

interface IAuthority {
	/* ========== EVENTS ========== */

	event GovernorPushed(address indexed from, address indexed to);
	event GuardianPushed(address indexed to);
	event ManagerPushed(address indexed from, address indexed to);

	event GovernorPulled(address indexed from, address indexed to);
	event GuardianRevoked(address indexed to);
	event ManagerPulled(address indexed from, address indexed to);

	/* ========== VIEW ========== */

	function governor() external view returns (address);

	function guardian(address _target) external view returns (bool);

	function manager() external view returns (address);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_authority","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"UNAUTHORIZED","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract IAuthority","name":"authority","type":"address"}],"name":"AuthorityUpdated","type":"event"},{"inputs":[{"internalType":"address","name":"underlying","type":"address"},{"internalType":"address","name":"strike","type":"address"},{"internalType":"address","name":"feed","type":"address"}],"name":"addPriceFeed","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"authority","outputs":[{"internalType":"contract IAuthority","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"underlying","type":"address"},{"internalType":"address","name":"strike","type":"address"}],"name":"getNormalizedRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"underlying","type":"address"},{"internalType":"address","name":"strike","type":"address"}],"name":"getRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"priceFeeds","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IAuthority","name":"_newAuthority","type":"address"}],"name":"setAuthority","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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