// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

pragma solidity ^0.8.2;

interface IERC1155Burnable {
	function burnFor(address _user, uint256 _tokenId, uint256 _amount) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

pragma solidity ^0.8.2;

interface LinkTokenInterface {
  function allowance(address owner, address spender) external view returns (uint256 remaining);

  function approve(address spender, uint256 value) external returns (bool success);

  function balanceOf(address owner) external view returns (uint256 balance);

  function decimals() external view returns (uint8 decimalPlaces);

  function decreaseApproval(address spender, uint256 addedValue) external returns (bool success);

  function increaseApproval(address spender, uint256 subtractedValue) external;

  function name() external view returns (string memory tokenName);

  function symbol() external view returns (string memory tokenSymbol);

  function totalSupply() external view returns (uint256 totalTokensIssued);

  function transfer(address to, uint256 value) external returns (bool success);

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  ) external returns (bool success);

  function transferFrom(
    address from,
    address to,
    uint256 value
  ) external returns (bool success);
}

pragma solidity ^0.8.2;

interface IVRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;
}

pragma solidity ^0.8.2;

import "IERC721.sol";
import "IERC1155.sol";
import "Ownable.sol";
import "VRFConsumberBase.sol";
import "IERC1155Burnable.sol";

contract TheKlaw is VRFConsumerBaseV2 {
	struct NFT {
		address contractAddress;
		uint256 tokenId;
	}

	address public immutable GOLDEN_TICKET;
	uint256 immutable TICKED_ID;
	address constant BURN_ADDRESS = 0x000000000000000000000000000000000000dEaD;


	uint256 totalCount;
	mapping(uint256 => NFT) public nfts;
	mapping(uint256 => address) public requestIds;
	mapping(address => bool) authorised;

	event NFTClaimed(address indexed receiver, address indexed tokenAddress, uint256 tokenId);

	constructor(address _gold, uint256 _ticketId, address _vrfCoordinator, address _link) VRFConsumerBaseV2(_vrfCoordinator, _link) {
		GOLDEN_TICKET = _gold;
		TICKED_ID = _ticketId;
	}

	modifier isAuthorised() {
		require(authorised[msg.sender] || msg.sender == owner());
        _;
	}

	function setAuthorised(address _user, bool _val) external onlyOwner {
		authorised[_user] = _val;
	}

	function viewNFTs(uint256 _start, uint256 _maxLen) external view returns(NFT[] memory) {
		// return empty array if _start is out of bounds
		if (_start >= totalCount)
			return new NFT[](0);

		// limits _maxLen so we only return existing NFTs 
		if (_start + _maxLen > totalCount)
			_maxLen = totalCount - _start;

		NFT[] memory _nfts = new NFT[](_maxLen);
		for (uint256 i = 0; i < _maxLen; i++) {
			_nfts[i] = nfts[i + _start];
		}
		return _nfts;
	}

	function depositNFTs(address[] calldata _contracts, uint256[] calldata _tokenIds) external isAuthorised {
		require(_contracts.length == _tokenIds.length);
		
		uint256 len = _contracts.length;
		uint256 currentCount = totalCount;
		for (uint256 i = 0; i < len; i++) {
			nfts[currentCount++] = NFT(_contracts[i], _tokenIds[i]);
		}
		totalCount = currentCount;
	}

	function removeNFTs(uint256[] calldata _nfts) external isAuthorised {
		uint256 total = totalCount;
		for (uint256 i = 0 ; i < _nfts.length; i++) {
			address nftContract = nfts[_nfts[i]].contractAddress;
			uint256 tokenId = nfts[_nfts[i]].tokenId;

			nfts[_nfts[i]] = nfts[total - i - 1];
			delete nfts[total - i - 1];
			IERC721(nftContract).transferFrom(address(this), owner(), tokenId);
		}
		totalCount -= _nfts.length;
	}

	function claimNft() external {
		uint256 requestId = requestRandomWords();
		requestIds[requestId] = msg.sender;
		IERC1155Burnable(GOLDEN_TICKET).burnFor(msg.sender, TICKED_ID, 1);
	}

	function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal override {
		address receiver = requestIds[requestId];
		uint256 total = totalCount--;
		uint256 index = randomWords[0] % total;
		address nftContract = nfts[index].contractAddress;
		uint256 tokenId = nfts[index].tokenId;

		nfts[index] = nfts[total - 1];
		delete nfts[total - 1];
		IERC721(nftContract).transferFrom(address(this), receiver, tokenId);
		emit NFTClaimed(receiver, nftContract, tokenId);
	}

	function onERC1155Received(address _operator, address _from, uint256 _id, uint256 _value, bytes calldata _data) external returns(bytes4) {
		return TheKlaw.onERC1155Received.selector;
	}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "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.
 */
abstract contract Ownable is Context {
    address internal _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual 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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

pragma solidity ^0.8.2;

import "IVRFCoordinatorV2Interface.sol";
import "ILink.sol";
import "Ownable.sol";

abstract contract VRFConsumerBaseV2 is Ownable {

	struct RequestConfig {
		uint64 subId;
		uint32 callbackGasLimit;
		uint16 requestConfirmations;
		uint32 numWords;
		bytes32 keyHash;
	}

	RequestConfig public config;
	IVRFCoordinatorV2Interface private COORDINATOR;
	LinkTokenInterface private LINK;


	/**
	* @param _vrfCoordinator address of VRFCoordinator contract
	*/
	// mainnet coord: 0x271682DEB8C4E0901D1a1550aD2e64D568E69909
	// mainnet link:  0x514910771af9ca656af840dff83e8264ecf986ca
	constructor(address _vrfCoordinator, address _link) {
		COORDINATOR = IVRFCoordinatorV2Interface(_vrfCoordinator);
		LINK = LinkTokenInterface(_link);
		
		config = RequestConfig({
			subId: 0,
			callbackGasLimit: 1000000,
			requestConfirmations: 3,
			numWords: 1,
			keyHash: 0x8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef
		});
	}

	function setupConfig(uint32 _gasLimit, uint16 _requestConfirmations, uint32 _numWords, bytes32 _keyHash) external onlyOwner {
		uint64 _subId = config.subId;
		config = RequestConfig({
			subId: _subId,
			callbackGasLimit: _gasLimit,
			requestConfirmations: _requestConfirmations,
			numWords: _numWords,
			keyHash: _keyHash
		});
	}

	/**
	* @notice fulfillRandomness handles the VRF response. Your contract must
	* @notice implement it. See "SECURITY CONSIDERATIONS" above for important
	* @notice principles to keep in mind when implementing your fulfillRandomness
	* @notice method.
	*
	* @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
	* @dev signature, and will call it once it has verified the proof
	* @dev associated with the randomness. (It is triggered via a call to
	* @dev rawFulfillRandomness, below.)
	*
	* @param requestId The Id initially returned by requestRandomness
	* @param randomWords the VRF output expanded to the requested number of words
	*/
	function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;

	// rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
	// proof. rawFulfillRandomness then calls fulfillRandomness, after validating
	// the origin of the call
	function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
		require (msg.sender == address(COORDINATOR), "!coordinator");
		fulfillRandomWords(requestId, randomWords);
	}

	  // Assumes the subscription is funded sufficiently.
	function requestRandomWords() internal returns(uint256 requestId) {
		RequestConfig memory rc = config;
		// Will revert if subscription is not set and funded.
		requestId = COORDINATOR.requestRandomWords(
			rc.keyHash,
			rc.subId,
			rc.requestConfirmations,
			rc.callbackGasLimit,
			rc.numWords
		);
	}

	function topUpSubscription(uint256 amount) external onlyOwner {
		LINK.transferAndCall(address(COORDINATOR), amount, abi.encode(config.subId));
	}

	function withdraw(uint256 amount, address to) external onlyOwner {
		LINK.transfer(to, amount);
	}

	function unsubscribe(address to) external onlyOwner {
		// Returns funds to this address
		COORDINATOR.cancelSubscription(config.subId, to);
		config.subId = 0;
	}

	function subscribe() public onlyOwner {
		// Create a subscription, current subId
		address[] memory consumers = new address[](1);
		consumers[0] = address(this);
		config.subId = COORDINATOR.createSubscription();
		COORDINATOR.addConsumer(config.subId, consumers[0]);
	}
}

{
  "compilationTarget": {
    "MainnetRedeemer.sol": "TheKlaw"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}