pragma solidity ^0.5.16;

import "./Ownable.sol";

contract DocumentStore is Ownable {
  string public name;
  string public version = "2.3.0";

  /// A mapping of the document hash to the block number that was issued
  mapping(bytes32 => uint256) public documentIssued;
  /// A mapping of the hash of the claim being revoked to the revocation block number
  mapping(bytes32 => uint256) public documentRevoked;

  event DocumentIssued(bytes32 indexed document);
  event DocumentRevoked(bytes32 indexed document);

  constructor(string memory _name) public {
    name = _name;
  }

  function issue(bytes32 document) public onlyOwner onlyNotIssued(document) {
    documentIssued[document] = block.number;
    emit DocumentIssued(document);
  }

  function bulkIssue(bytes32[] memory documents) public {
    for (uint256 i = 0; i < documents.length; i++) {
      issue(documents[i]);
    }
  }

  function getIssuedBlock(bytes32 document) public view onlyIssued(document) returns (uint256) {
    return documentIssued[document];
  }

  function isIssued(bytes32 document) public view returns (bool) {
    return (documentIssued[document] != 0);
  }

  function isIssuedBefore(bytes32 document, uint256 blockNumber) public view returns (bool) {
    return documentIssued[document] != 0 && documentIssued[document] <= blockNumber;
  }

  function revoke(bytes32 document) public onlyOwner onlyNotRevoked(document) returns (bool) {
    documentRevoked[document] = block.number;
    emit DocumentRevoked(document);
  }

  function bulkRevoke(bytes32[] memory documents) public {
    for (uint256 i = 0; i < documents.length; i++) {
      revoke(documents[i]);
    }
  }

  function isRevoked(bytes32 document) public view returns (bool) {
    return documentRevoked[document] != 0;
  }

  function isRevokedBefore(bytes32 document, uint256 blockNumber) public view returns (bool) {
    return documentRevoked[document] <= blockNumber && documentRevoked[document] != 0;
  }

  modifier onlyIssued(bytes32 document) {
    require(isIssued(document), "Error: Only issued document hashes can be revoked");
    _;
  }

  modifier onlyNotIssued(bytes32 document) {
    require(!isIssued(document), "Error: Only hashes that have not been issued can be issued");
    _;
  }

  modifier onlyNotRevoked(bytes32 claim) {
    require(!isRevoked(claim), "Error: Hash has been revoked previously");
    _;
  }
}

pragma solidity ^0.5.16;

/**
 * @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.
 *
 * 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 {
  address private _owner;

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

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

  /**
   * @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(isOwner(), "Ownable: caller is not the owner");
    _;
  }

  /**
   * @dev Returns true if the caller is the current owner.
   */
  function isOwner() public view returns (bool) {
    return msg.sender == _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 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 onlyOwner {
    _transferOwnership(newOwner);
  }

  /**
   * @dev Transfers ownership of the contract to a new account (`newOwner`).
   */
  function _transferOwnership(address newOwner) internal {
    require(newOwner != address(0), "Ownable: new owner is the zero address");
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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