Ethereum + OpenAI integration using Chainlink

ChatGPT-Client.sol

pragma solidity ^0.6.7;
import "@chainlink/contracts/src/v0.6/ChainlinkClient.sol";
import "@chainlink/contracts/src/v0.6/vendor/Ownable.sol";

contract ChatGPT is ChainlinkClient, Ownable {
  uint256 private fee;
  address private oracle;
  bytes32 private jobId;

  event ResponseReceived(
    bytes32 indexed requestId,
    uint256 indexed statusCode,
    string indexed data
  );

  constructor(address _oracle, string memory _jobId, uint256 _fee) public {
    setChainlinkToken(0xa36085F69e2889c224210F603D836748e7dC0088);
    oracle = _oracle;
    jobId = stringToBytes32(_jobId);
    fee = _fee;
  }

  function requestChatGPT(string memory prompt) public returns (bytes32 requestId) {
    Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), this.fulfill.selector);
    request.add("get", "https://api.openai.com/v1/engines/davinci-codex/completions");
    request.addHeader("Authorization", "Bearer YOUR_OPEN_AI_KEY");
    request.addHeader("Content-Type", "application/json");
    request.add("prompt", prompt);
    return sendChainlinkRequestTo(oracle, request, fee);
  }

  function fulfill(bytes32 _requestId, uint256 _statusCode, string memory _data) public recordChainlinkFulfillment(_requestId) {
    emit ResponseReceived(_requestId, _statusCode, _data);
  }

  function stringToBytes32(string memory source) private pure returns (bytes32 result) {
    bytes memory tempEmptyStringTest = bytes(source);
    if (tempEmptyStringTest.length == 0) {
      return 0x0;
    }
    assembly {
      result := mload(add(source, 32))
    }
  }
}