Moonbase Alpha Testnet

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0x0D7F341DC7E2a3fd31fB2c348a60e08e0E78c9a8

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0x6080604019284212022-03-31 14:27:06728 days ago1648736826IN
 Create: RiverboatSwapParams
0 DEV0.0125696420

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Contract Source Code Verified (Exact Match)

Contract Name:
RiverboatSwapParams

Compiler Version
v0.6.7+commit.b8d736ae

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 4 : RiverboatSwapParams.sol
pragma solidity 0.6.7;
pragma experimental ABIEncoderV2;

import "./../SwapSigner.sol";

/// @title RiverboatSwapParams is nft params encoder/decoder, signature verifyer
/// @author Nejc Schneider
contract RiverboatSwapParams {
    SwapSigner private swapSigner;

    constructor(address _signerAddress) public {
        swapSigner = SwapSigner(_signerAddress);
    }

    // takes in _encodedData and converts to seascape
    function paramsAreValid (uint256 _offerId, bytes memory _encodedData,
      uint8 v, bytes32 r, bytes32 s) public view returns (bool){

      (uint256 nftId, uint8 category) = decodeParams(_encodedData);

      bytes32 hash = this.encodeParams(_offerId, nftId, category);

      address recover = ecrecover(hash, v, r, s);
      require(recover == swapSigner.getSigner(),  "Verification failed");

    	return true;
    }

    function encodeParams(
        uint256 _offerId,
        uint256 _nftId,
        uint8 _category
    )
        public
        view
        returns (bytes32 message)
    {
        bytes memory prefix = "\x19Ethereum Signed Message:\n32";
        bytes32 messageNoPrefix = keccak256(abi
            .encode(_offerId, _nftId, _category));
        bytes32 hash = keccak256(abi.encodePacked(prefix, messageNoPrefix));

        return hash;
    }

    function decodeParams (bytes memory _encodedData)
        public
        view
        returns (
            uint256 nftId,
            uint8 category
        )
    {
        (uint256 nftId, uint8 category) = abi
            .decode(_encodedData, (uint256, uint8));

        return (nftId, category);
    }


}

File 2 of 4 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 3 of 4 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 4 of 4 : SwapSigner.sol
pragma solidity 0.6.7;

import "./../openzeppelin/contracts/access/Ownable.sol";

contract SwapSigner is Ownable {

    address public signer;         // @dev verify v, r, s signature

    constructor() public { signer = msg.sender; }

    /// @notice change address to verify signature against
    /// @param _signer new signer address
    function setSigner(address _signer) external onlyOwner {
        require(_signer != address(0), "invalid signer address");
        signer = _signer;
    }

    /// @notice returns verifier of signatures
    /// @return signer address
    function getSigner() external view returns(address) { return signer; }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_signerAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes","name":"_encodedData","type":"bytes"}],"name":"decodeParams","outputs":[{"internalType":"uint256","name":"nftId","type":"uint256"},{"internalType":"uint8","name":"category","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_offerId","type":"uint256"},{"internalType":"uint256","name":"_nftId","type":"uint256"},{"internalType":"uint8","name":"_category","type":"uint8"}],"name":"encodeParams","outputs":[{"internalType":"bytes32","name":"message","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_offerId","type":"uint256"},{"internalType":"bytes","name":"_encodedData","type":"bytes"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"paramsAreValid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000061983368f5b3d639e3e90bebf708e2a524572f32

-----Decoded View---------------
Arg [0] : _signerAddress (address): 0x61983368F5b3d639E3e90BEbf708e2a524572F32

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000061983368f5b3d639e3e90bebf708e2a524572f32


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.