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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // SPDX-License-Identifier: MIT | ||
| pragma solidity ^0.8.0; | ||
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| contract PriceOracle { | ||
| uint256 public currentPrice; | ||
| address private owner; | ||
| address public authorizedSigner; | ||
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| event PriceUpdated(uint256 newPrice); | ||
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| constructor(address _authorizedSigner) { | ||
| owner = msg.sender; | ||
| authorizedSigner = _authorizedSigner; | ||
| } | ||
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| modifier onlyOwner() { | ||
| require(msg.sender == owner, "Only owner can call this."); | ||
| _; | ||
| } | ||
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| function updateAuthorizedSigner(address _newSigner) public onlyOwner { | ||
| authorizedSigner = _newSigner; | ||
| } | ||
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| function updatePrice(uint256 _newPrice, uint256 _nonce, bytes memory _signature) public { | ||
| require(recoverSigner(_newPrice, _nonce, _signature) == authorizedSigner, "Invalid or unauthorized signature"); | ||
| currentPrice = _newPrice; | ||
| emit PriceUpdated(_newPrice); | ||
| } | ||
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| function recoverSigner(uint256 _newPrice, uint256 _nonce, bytes memory _signature) internal pure returns (address) { | ||
| bytes32 dataHash = keccak256(abi.encodePacked(_newPrice, _nonce)); | ||
| bytes32 messageHash = prefixed(dataHash); | ||
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| // Split the signature into r, s, and v variables | ||
| (bytes32 r, bytes32 s, uint8 v) = splitSignature(_signature); | ||
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| // Perform the ecrecover operation to determine the signer | ||
| return ecrecover(messageHash, v, r, s); | ||
| } | ||
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| // Internal function to split a signature into r, s, and v | ||
| function splitSignature(bytes memory sig) | ||
| internal | ||
| pure | ||
| returns (bytes32 r, bytes32 s, uint8 v) | ||
| { | ||
| require(sig.length == 65, "Invalid signature length"); | ||
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| assembly { | ||
| // First 32 bytes, after the length prefix | ||
| r := mload(add(sig, 32)) | ||
| // Second 32 bytes | ||
| s := mload(add(sig, 64)) | ||
| // Final byte (first byte of the next 32 bytes) | ||
| v := byte(0, mload(add(sig, 96))) | ||
| } | ||
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| if (v < 27) { | ||
| v += 27; | ||
| } | ||
| } | ||
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| function prefixed(bytes32 hash) internal pure returns (bytes32) { | ||
| return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); | ||
| } | ||
| } |
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