Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

import {IVRFProvider, IVRFConsumer} from "./IVRF.sol";

contract VRFProvider is IVRFProvider {
    address private owner;
    mapping(address => bool) public signers;
    uint256 private seqNo = 100_000_000;

    mapping(address => bool) consumers;
    mapping(uint256 => address) callbacks;

    event RandomnessRequested(uint256 indexed seqNo, address indexed consumer);
    event RandomnessReceived(uint256 indexed seqNo, uint256 randomNumber, bytes signature);

    constructor() {
        owner = msg.sender;
    }

    function setConsumer(address consumer, bool enabled) external {
        require(owner == msg.sender, "only owner");
        consumers[consumer] = enabled;
    }

    function setSigner(address signer, bool enabled) external {
        require(owner == msg.sender, "only owner");
        signers[signer] = enabled;
    }

    function requestRandomNumberWithTraceId(uint256 _traceId) external returns (uint256) {
        require(consumers[msg.sender], "only consumers");
        callbacks[++seqNo] = msg.sender;
        emit RandomnessRequested(seqNo, msg.sender);
        return seqNo;
    }

    function entropyCallback(uint256 _seqNo, uint256 randomNumber, bytes calldata _signature) external {
        require(callbacks[_seqNo] != address(0), "missing callback");

        require(
            _isValidSignature(
                keccak256(
                    abi.encodePacked("\x19Ethereum Signed Message:\n32", keccak256(abi.encode(_seqNo, randomNumber)))
                ),
                _signature
            ),
            "Invalid signature"
        );

        address consumer = callbacks[_seqNo];
        delete callbacks[_seqNo];

        IVRFConsumer(consumer).randomNumberCallback(_seqNo, randomNumber);

        emit RandomnessReceived(_seqNo, randomNumber, _signature);
    }

    function _isValidSignature(bytes32 _hash, bytes memory _signature) internal view returns (bool) {
        require(_signature.length == 65, "Invalid signature length");
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            r := mload(add(_signature, 32))
            s := mload(add(_signature, 64))
            v := byte(0, mload(add(_signature, 96)))
        }
        if (v < 27) v += 27;
        address recoveredSigner = ecrecover(_hash, v, r, s);
        return signers[recoveredSigner];
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;

interface IVRFConsumer {
    function randomNumberCallback(uint256 requestId, uint256 randomNumber) external;
}

interface IVRFProvider {
    function requestRandomNumberWithTraceId(uint256 traceId) external returns (uint256);
    function entropyCallback(uint256 _seqNo, uint256 randomNumber, bytes calldata _signature) external;
}

{
  "viaIR": false,
  "codegen": "yul",
  "evmVersion": "cancun",
  "outputSelection": {
    "*": {
      "*": [
        "abi",
        "metadata"
      ],
      "": [
        "ast"
      ]
    }
  },
  "optimizer": {
    "enabled": true,
    "mode": "3",
    "fallback_to_optimizing_for_size": false,
    "disable_system_request_memoization": true
  },
  "metadata": {},
  "libraries": {},
  "enableEraVMExtensions": false,
  "forceEVMLA": false
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"seqNo","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"randomNumber","type":"uint256"},{"indexed":false,"internalType":"bytes","name":"signature","type":"bytes"}],"name":"RandomnessReceived","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"seqNo","type":"uint256"},{"indexed":true,"internalType":"address","name":"consumer","type":"address"}],"name":"RandomnessRequested","type":"event"},{"inputs":[{"internalType":"uint256","name":"_seqNo","type":"uint256"},{"internalType":"uint256","name":"randomNumber","type":"uint256"},{"internalType":"bytes","name":"_signature","type":"bytes"}],"name":"entropyCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_traceId","type":"uint256"}],"name":"requestRandomNumberWithTraceId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"consumer","type":"address"},{"internalType":"bool","name":"enabled","type":"bool"}],"name":"setConsumer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"signer","type":"address"},{"internalType":"bool","name":"enabled","type":"bool"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"signers","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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