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Contract

0x38b6ab6B9294CCe1Ccb59c3e7D390690B4c18B1A
 

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x7A9d706B...2B3d7b24B
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Oracle

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2019-06-28
*/

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.4.24;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    c = _a * _b;
    assert(c / _a == _b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // assert(_b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = _a / _b;
    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
    return _a / _b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b <= _a);
    return _a - _b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    c = _a + _b;
    assert(c >= _a);
    return c;
  }
}

// File: contracts/interfaces/ChainlinkRequestInterface.sol

pragma solidity 0.4.24;

interface ChainlinkRequestInterface {
  function oracleRequest(
    address sender,
    uint256 payment,
    bytes32 id,
    address callbackAddress,
    bytes4 callbackFunctionId,
    uint256 nonce,
    uint256 version,
    bytes data
  ) external;

  function cancelOracleRequest(
    bytes32 requestId,
    uint256 payment,
    bytes4 callbackFunctionId,
    uint256 expiration
  ) external;
}

// File: contracts/interfaces/OracleInterface.sol

pragma solidity 0.4.24;

interface OracleInterface {
  function fulfillOracleRequest(
    bytes32 requestId,
    uint256 payment,
    address callbackAddress,
    bytes4 callbackFunctionId,
    uint256 expiration,
    bytes32 data
  ) external returns (bool);
  function getAuthorizationStatus(address node) external view returns (bool);
  function setFulfillmentPermission(address node, bool allowed) external;
  function withdraw(address recipient, uint256 amount) external;
  function withdrawable() external view returns (uint256);
}

// File: contracts/interfaces/LinkTokenInterface.sol

pragma solidity 0.4.24;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external returns (bool success);
  function approve(address spender, uint256 value) external returns (bool success);
  function balanceOf(address owner) external returns (uint256 balance);
  function decimals() external returns (uint8 decimalPlaces);
  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);
  function increaseApproval(address spender, uint256 subtractedValue) external;
  function name() external returns (string tokenName);
  function symbol() external returns (string tokenSymbol);
  function totalSupply() external returns (uint256 totalTokensIssued);
  function transfer(address to, uint256 value) external returns (bool success);
  function transferAndCall(address to, uint256 value, bytes data) external returns (bool success);
  function transferFrom(address from, address to, uint256 value) external returns (bool success);
}

// File: contracts/Oracle.sol

pragma solidity 0.4.24;






/**
 * @title The Chainlink Oracle contract
 * @notice Node operators can deploy this contract to fulfill requests sent to them
 */
contract Oracle is ChainlinkRequestInterface, OracleInterface, Ownable {
  using SafeMath for uint256;

  uint256 constant public EXPIRY_TIME = 5 minutes;
  uint256 constant private MINIMUM_CONSUMER_GAS_LIMIT = 400000;
  // We initialize fields to 1 instead of 0 so that the first invocation
  // does not cost more gas.
  uint256 constant private ONE_FOR_CONSISTENT_GAS_COST = 1;
  uint256 constant private SELECTOR_LENGTH = 4;
  uint256 constant private EXPECTED_REQUEST_WORDS = 2;
  // solium-disable-next-line zeppelin/no-arithmetic-operations
  uint256 constant private MINIMUM_REQUEST_LENGTH = SELECTOR_LENGTH + (32 * EXPECTED_REQUEST_WORDS);

  LinkTokenInterface internal LinkToken;
  mapping(bytes32 => bytes32) private commitments;
  mapping(address => bool) private authorizedNodes;
  uint256 private withdrawableTokens = ONE_FOR_CONSISTENT_GAS_COST;

  event OracleRequest(
    bytes32 indexed specId,
    address requester,
    bytes32 requestId,
    uint256 payment,
    address callbackAddr,
    bytes4 callbackFunctionId,
    uint256 cancelExpiration,
    uint256 dataVersion,
    bytes data
  );

  event CancelOracleRequest(
    bytes32 indexed requestId
  );

  /**
   * @notice Deploy with the address of the LINK token
   * @dev Sets the LinkToken address for the imported LinkTokenInterface
   * @param _link The address of the LINK token
   */
  constructor(address _link) Ownable() public {
    LinkToken = LinkTokenInterface(_link);
  }

  /**
   * @notice Called when LINK is sent to the contract via `transferAndCall`
   * @dev The data payload's first 2 words will be overwritten by the `_sender` and `_amount`
   * values to ensure correctness. Calls oracleRequest.
   * @param _sender Address of the sender
   * @param _amount Amount of LINK sent (specified in wei)
   * @param _data Payload of the transaction
   */
  function onTokenTransfer(
    address _sender,
    uint256 _amount,
    bytes _data
  )
    public
    onlyLINK
    validRequestLength(_data)
    permittedFunctionsForLINK(_data)
  {
    assembly {
      // solium-disable-next-line security/no-low-level-calls
      mstore(add(_data, 36), _sender) // ensure correct sender is passed
      // solium-disable-next-line security/no-low-level-calls
      mstore(add(_data, 68), _amount)    // ensure correct amount is passed
    }
    // solium-disable-next-line security/no-low-level-calls
    require(address(this).delegatecall(_data), "Unable to create request"); // calls oracleRequest
  }

  /**
   * @notice Creates the Chainlink request
   * @dev Stores the hash of the params as the on-chain commitment for the request.
   * Emits OracleRequest event for the Chainlink node to detect.
   * @param _sender The sender of the request
   * @param _payment The amount of payment given (specified in wei)
   * @param _specId The Job Specification ID
   * @param _callbackAddress The callback address for the response
   * @param _callbackFunctionId The callback function ID for the response
   * @param _nonce The nonce sent by the requester
   * @param _dataVersion The specified data version
   * @param _data The CBOR payload of the request
   */
  function oracleRequest(
    address _sender,
    uint256 _payment,
    bytes32 _specId,
    address _callbackAddress,
    bytes4 _callbackFunctionId,
    uint256 _nonce,
    uint256 _dataVersion,
    bytes _data
  )
    external
    onlyLINK
    checkCallbackAddress(_callbackAddress)
  {
    bytes32 requestId = keccak256(abi.encodePacked(_sender, _nonce));
    require(commitments[requestId] == 0, "Must use a unique ID");
    uint256 expiration = now.add(EXPIRY_TIME);

    commitments[requestId] = keccak256(
      abi.encodePacked(
        _payment,
        _callbackAddress,
        _callbackFunctionId,
        expiration
      )
    );

    emit OracleRequest(
      _specId,
      _sender,
      requestId,
      _payment,
      _callbackAddress,
      _callbackFunctionId,
      expiration,
      _dataVersion,
      _data);
  }

  /**
   * @notice Called by the Chainlink node to fulfill requests
   * @dev Given params must hash back to the commitment stored from `oracleRequest`.
   * Will call the callback address' callback function without bubbling up error
   * checking in a `require` so that the node can get paid.
   * @param _requestId The fulfillment request ID that must match the requester's
   * @param _payment The payment amount that will be released for the oracle (specified in wei)
   * @param _callbackAddress The callback address to call for fulfillment
   * @param _callbackFunctionId The callback function ID to use for fulfillment
   * @param _expiration The expiration that the node should respond by before the requester can cancel
   * @param _data The data to return to the consuming contract
   * @return Status if the external call was successful
   */
  function fulfillOracleRequest(
    bytes32 _requestId,
    uint256 _payment,
    address _callbackAddress,
    bytes4 _callbackFunctionId,
    uint256 _expiration,
    bytes32 _data
  )
    external
    onlyAuthorizedNode
    isValidRequest(_requestId)
    returns (bool)
  {
    bytes32 paramsHash = keccak256(
      abi.encodePacked(
        _payment,
        _callbackAddress,
        _callbackFunctionId,
        _expiration
      )
    );
    require(commitments[_requestId] == paramsHash, "Params do not match request ID");
    withdrawableTokens = withdrawableTokens.add(_payment);
    delete commitments[_requestId];
    require(gasleft() >= MINIMUM_CONSUMER_GAS_LIMIT, "Must provide consumer enough gas");
    // All updates to the oracle's fulfillment should come before calling the
    // callback(addr+functionId) as it is untrusted.
    // See: https://solidity.readthedocs.io/en/develop/security-considerations.html#use-the-checks-effects-interactions-pattern
    return _callbackAddress.call(_callbackFunctionId, _requestId, _data); // solium-disable-line security/no-low-level-calls
  }

  /**
   * @notice Use this to check if a node is authorized for fulfilling requests
   * @param _node The address of the Chainlink node
   * @return The authorization status of the node
   */
  function getAuthorizationStatus(address _node) external view returns (bool) {
    return authorizedNodes[_node];
  }

  /**
   * @notice Sets the fulfillment permission for a given node. Use `true` to allow, `false` to disallow.
   * @param _node The address of the Chainlink node
   * @param _allowed Bool value to determine if the node can fulfill requests
   */
  function setFulfillmentPermission(address _node, bool _allowed) external onlyOwner {
    authorizedNodes[_node] = _allowed;
  }

  /**
   * @notice Allows the node operator to withdraw earned LINK to a given address
   * @dev The owner of the contract can be another wallet and does not have to be a Chainlink node
   * @param _recipient The address to send the LINK token to
   * @param _amount The amount to send (specified in wei)
   */
  function withdraw(address _recipient, uint256 _amount)
    external
    onlyOwner
    hasAvailableFunds(_amount)
  {
    withdrawableTokens = withdrawableTokens.sub(_amount);
    assert(LinkToken.transfer(_recipient, _amount));
  }

  /**
   * @notice Displays the amount of LINK that is available for the node operator to withdraw
   * @dev We use `ONE_FOR_CONSISTENT_GAS_COST` in place of 0 in storage
   * @return The amount of withdrawable LINK on the contract
   */
  function withdrawable() external view onlyOwner returns (uint256) {
    return withdrawableTokens.sub(ONE_FOR_CONSISTENT_GAS_COST);
  }

  /**
   * @notice Allows requesters to cancel requests sent to this oracle contract. Will transfer the LINK
   * sent for the request back to the requester's address.
   * @dev Given params must hash to a commitment stored on the contract in order for the request to be valid
   * Emits CancelOracleRequest event.
   * @param _requestId The request ID
   * @param _payment The amount of payment given (specified in wei)
   * @param _callbackFunc The requester's specified callback address
   * @param _expiration The time of the expiration for the request
   */
  function cancelOracleRequest(
    bytes32 _requestId,
    uint256 _payment,
    bytes4 _callbackFunc,
    uint256 _expiration
  ) external {
    bytes32 paramsHash = keccak256(
      abi.encodePacked(
        _payment,
        msg.sender,
        _callbackFunc,
        _expiration)
    );
    require(paramsHash == commitments[_requestId], "Params do not match request ID");
    require(_expiration <= now, "Request is not expired");

    delete commitments[_requestId];
    emit CancelOracleRequest(_requestId);

    assert(LinkToken.transfer(msg.sender, _payment));
  }

  // MODIFIERS

  /**
   * @dev Reverts if amount requested is greater than withdrawable balance
   * @param _amount The given amount to compare to `withdrawableTokens`
   */
  modifier hasAvailableFunds(uint256 _amount) {
    require(withdrawableTokens >= _amount.add(ONE_FOR_CONSISTENT_GAS_COST), "Amount requested is greater than withdrawable balance");
    _;
  }

  /**
   * @dev Reverts if request ID does not exist
   * @param _requestId The given request ID to check in stored `commitments`
   */
  modifier isValidRequest(bytes32 _requestId) {
    require(commitments[_requestId] != 0, "Must have a valid requestId");
    _;
  }

  /**
   * @dev Reverts if `msg.sender` is not authorized to fulfill requests
   */
  modifier onlyAuthorizedNode() {
    require(authorizedNodes[msg.sender] || msg.sender == owner, "Not an authorized node to fulfill requests");
    _;
  }

  /**
   * @dev Reverts if not sent from the LINK token
   */
  modifier onlyLINK() {
    require(msg.sender == address(LinkToken), "Must use LINK token");
    _;
  }

  /**
   * @dev Reverts if the given data does not begin with the `oracleRequest` function selector
   * @param _data The data payload of the request
   */
  modifier permittedFunctionsForLINK(bytes _data) {
    bytes4 funcSelector;
    assembly {
      // solium-disable-next-line security/no-low-level-calls
      funcSelector := mload(add(_data, 32))
    }
    require(funcSelector == this.oracleRequest.selector, "Must use whitelisted functions");
    _;
  }

  /**
   * @dev Reverts if the callback address is the LINK token
   * @param _to The callback address
   */
  modifier checkCallbackAddress(address _to) {
    require(_to != address(LinkToken), "Cannot callback to LINK");
    _;
  }

  /**
   * @dev Reverts if the given payload is less than needed to create a request
   * @param _data The request payload
   */
  modifier validRequestLength(bytes _data) {
    require(_data.length >= MINIMUM_REQUEST_LENGTH, "Invalid request length");
    _;
  }

}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"_sender","type":"address"},{"name":"_payment","type":"uint256"},{"name":"_specId","type":"bytes32"},{"name":"_callbackAddress","type":"address"},{"name":"_callbackFunctionId","type":"bytes4"},{"name":"_nonce","type":"uint256"},{"name":"_dataVersion","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"oracleRequest","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_requestId","type":"bytes32"},{"name":"_payment","type":"uint256"},{"name":"_callbackAddress","type":"address"},{"name":"_callbackFunctionId","type":"bytes4"},{"name":"_expiration","type":"uint256"},{"name":"_data","type":"bytes32"}],"name":"fulfillOracleRequest","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"EXPIRY_TIME","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"withdrawable","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_requestId","type":"bytes32"},{"name":"_payment","type":"uint256"},{"name":"_callbackFunc","type":"bytes4"},{"name":"_expiration","type":"uint256"}],"name":"cancelOracleRequest","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_node","type":"address"},{"name":"_allowed","type":"bool"}],"name":"setFulfillmentPermission","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_sender","type":"address"},{"name":"_amount","type":"uint256"},{"name":"_data","type":"bytes"}],"name":"onTokenTransfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_node","type":"address"}],"name":"getAuthorizationStatus","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_recipient","type":"address"},{"name":"_amount","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_link","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"specId","type":"bytes32"},{"indexed":false,"name":"requester","type":"address"},{"indexed":false,"name":"requestId","type":"bytes32"},{"indexed":false,"name":"payment","type":"uint256"},{"indexed":false,"name":"callbackAddr","type":"address"},{"indexed":false,"name":"callbackFunctionId","type":"bytes4"},{"indexed":false,"name":"cancelExpiration","type":"uint256"},{"indexed":false,"name":"dataVersion","type":"uint256"},{"indexed":false,"name":"data","type":"bytes"}],"name":"OracleRequest","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"requestId","type":"bytes32"}],"name":"CancelOracleRequest","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"}],"name":"OwnershipRenounced","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

Deployed Bytecode

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Swarm Source

bzzr://61060c39ff9573ae8a43e19afb5f4f8a741e02f0c65236909c348cf2067a337d

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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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.