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//SPDX-License-Identifier: MIT
pragma solidity 0.7.5;

import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
import "./ClaimERC1155.sol";
import "../common/BaseWithStorage/WithAdmin.sol";

/// @title AssetGiveaway contract
/// @notice This contract manages ERC1155 claims
contract AssetGiveaway is WithAdmin, ClaimERC1155 {
    bytes4 private constant ERC1155_RECEIVED = 0xf23a6e61;
    bytes4 private constant ERC1155_BATCH_RECEIVED = 0xbc197c81;
    uint256 internal immutable _expiryTime;
    mapping(address => bool) public claimed;

    constructor(
        address asset,
        address admin,
        bytes32 merkleRoot,
        address assetsHolder,
        uint256 expiryTime
    ) ClaimERC1155(IERC1155(asset), assetsHolder) {
        _admin = admin;
        _merkleRoot = merkleRoot;
        _expiryTime = expiryTime;
    }

    /// @notice Function to set the merkle root hash for the asset data, if it is 0
    /// @param merkleRoot The merkle root hash of the asset data
    function setMerkleRoot(bytes32 merkleRoot) external onlyAdmin {
        require(_merkleRoot == 0, "MERKLE_ROOT_ALREADY_SET");
        _merkleRoot = merkleRoot;
    }

    /// @notice Function to permit the claiming of an asset to a reserved address
    /// @param to The intended recipient (reserved address) of the ERC1155 tokens
    /// @param assetIds The array of IDs of the asset tokens
    /// @param assetValues The amounts of each token ID to transfer
    /// @param proof The proof submitted for verification
    /// @param salt The salt submitted for verification
    function claimAssets(
        address to,
        uint256[] calldata assetIds,
        uint256[] calldata assetValues,
        bytes32[] calldata proof,
        bytes32 salt
    ) external {
        require(block.timestamp < _expiryTime, "CLAIM_PERIOD_IS_OVER");
        require(to != address(0), "INVALID_TO_ZERO_ADDRESS");
        require(claimed[to] == false, "DESTINATION_ALREADY_CLAIMED");
        claimed[to] = true;
        _claimERC1155(to, assetIds, assetValues, proof, salt);
    }

    function onERC1155Received(
        address, /*operator*/
        address, /*from*/
        uint256, /*id*/
        uint256, /*value*/
        bytes calldata /*data*/
    ) external pure returns (bytes4) {
        return ERC1155_RECEIVED;
    }

    function onERC1155BatchReceived(
        address, /*operator*/
        address, /*from*/
        uint256[] calldata, /*ids*/
        uint256[] calldata, /*values*/
        bytes calldata /*data*/
    ) external pure returns (bytes4) {
        return ERC1155_BATCH_RECEIVED;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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

pragma solidity ^0.7.0;

import "../../introspection/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;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../introspection/IERC165.sol";

/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}

//SPDX-License-Identifier: MIT
pragma solidity 0.7.5;

import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";

contract ClaimERC1155 {
    bytes32 internal _merkleRoot;
    IERC1155 internal immutable _asset;
    address internal immutable _assetsHolder;
    event ClaimedAssets(address to, uint256[] assetIds, uint256[] assetValues);

    constructor(IERC1155 asset, address assetsHolder) {
        _asset = asset;
        if (assetsHolder == address(0)) {
            assetsHolder = address(this);
        }
        _assetsHolder = assetsHolder;
    }

    function _claimERC1155(
        address to,
        uint256[] calldata assetIds,
        uint256[] calldata assetValues,
        bytes32[] calldata proof,
        bytes32 salt
    ) internal {
        _checkValidity(to, assetIds, assetValues, proof, salt);
        _sendAssets(to, assetIds, assetValues);
        emit ClaimedAssets(to, assetIds, assetValues);
    }

    function _checkValidity(
        address to,
        uint256[] memory assetIds,
        uint256[] memory assetValues,
        bytes32[] memory proof,
        bytes32 salt
    ) internal view {
        require(assetIds.length == assetValues.length, "INVALID_INPUT");
        bytes32 leaf = _generateClaimHash(to, assetIds, assetValues, salt);
        require(_verify(proof, leaf), "INVALID_CLAIM");
    }

    function _generateClaimHash(
        address to,
        uint256[] memory assetIds,
        uint256[] memory assetValues,
        bytes32 salt
    ) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(to, assetIds, assetValues, salt));
    }

    function _verify(bytes32[] memory proof, bytes32 leaf) internal view returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash < proofElement) {
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        return computedHash == _merkleRoot;
    }

    function _sendAssets(
        address to,
        uint256[] memory assetIds,
        uint256[] memory assetValues
    ) internal {
        _asset.safeBatchTransferFrom(_assetsHolder, to, assetIds, assetValues, "");
    }
}

//SPDX-License-Identifier: MIT
pragma solidity 0.7.5;

contract WithAdmin {
    address internal _admin;

    /// @dev Emits when the contract administrator is changed.
    /// @param oldAdmin The address of the previous administrator.
    /// @param newAdmin The address of the new administrator.
    event AdminChanged(address oldAdmin, address newAdmin);

    modifier onlyAdmin() {
        require(msg.sender == _admin, "ADMIN_ONLY");
        _;
    }

    /// @dev Get the current administrator of this contract.
    /// @return The current administrator of this contract.
    function getAdmin() external view returns (address) {
        return _admin;
    }

    /// @dev Change the administrator to be `newAdmin`.
    /// @param newAdmin The address of the new administrator.
    function changeAdmin(address newAdmin) external {
        require(msg.sender == _admin, "ADMIN_ACCESS_DENIED");
        emit AdminChanged(_admin, newAdmin);
        _admin = newAdmin;
    }
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000067a1eb5e383ed24b66d72aaf80d8d7db3d299a800000000000000000000000000000000000000000000000000000000000000005fb1bbae8606b978826eefa4238897449bd526b0cbd470d4c3d28691221eef8a0000000000000000000000000000000000000000000000000000000000000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff

-----Decoded View---------------
Arg [0] : asset (address): 0x067a1Eb5E383eD24b66D72aAf80d8D7dB3d299A8
Arg [1] : admin (address): 0x0000000000000000000000000000000000000000
Arg [2] : merkleRoot (bytes32): 0x5fb1bbae8606b978826eefa4238897449bd526b0cbd470d4c3d28691221eef8a
Arg [3] : assetsHolder (address): 0x0000000000000000000000000000000000000000
Arg [4] : expiryTime (uint256): 115792089237316195423570985008687907853269984665640564039457584007913129639935

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 000000000000000000000000067a1eb5e383ed24b66d72aaf80d8d7db3d299a8
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 5fb1bbae8606b978826eefa4238897449bd526b0cbd470d4c3d28691221eef8a
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff