// SPDX-License-Identifier: GPL-3.0
// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropERC20 {

    function verifyLinkdropSignerSignature
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        bytes calldata _signature
    )
    external view returns (bool);

    function checkClaimParams
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
    )
    external view returns (bool);

    function claim
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
      external payable returns (bool);
}


// Dependency file: contracts/interfaces/ILinkdropFactoryERC20.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropFactoryERC20 {

    function checkClaimParams
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
    )
    external view
    returns (bool);

    function claim
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    returns (bool);
}


// Dependency file: openzeppelin-solidity/contracts/utils/Context.sol


// pragma solidity >=0.6.0 <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 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;
    }
}


// Dependency file: openzeppelin-solidity/contracts/access/Ownable.sol


// pragma solidity >=0.6.0 <0.8.0;

// import "openzeppelin-solidity/contracts/utils/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 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 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 {
        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;
    }
}


// Dependency file: contracts/interfaces/IFeeManager.sol

// pragma solidity >=0.6.0 <0.8.0;

interface IFeeManager {
  function isWhitelisted(address _addr) external view returns (bool);
  function whitelist(address _addr) external returns (bool);
  function cancelWhitelist(address _addr) external returns (bool);
  function changeFeeReceiver(address payable _addr) external returns (bool);
  function updateFee(uint _fee) external returns (bool);
  function updateClaimerFee(uint _claimerFee) external returns (bool);  
  function withdraw() external returns (bool);
  function calculateFee(
                        address _linkdropMaster,
                        address _tokenAddress,
                        address _receiver) external view returns (uint);
  function feeReceiver() external view returns (address payable); 
}


// Dependency file: contracts/storage/LinkdropFactoryStorage.sol

// pragma solidity >=0.6.0 <0.8.0;
// import "openzeppelin-solidity/contracts/access/Ownable.sol";
// import "contracts/interfaces/IFeeManager.sol";

contract LinkdropFactoryStorage is Ownable {

    // Current version of mastercopy contract
    uint public masterCopyVersion;

    // Contract bytecode to be installed when deploying proxy
    bytes internal _bytecode;

    // Bootstrap initcode to fetch the actual contract bytecode. Used to generate repeatable contract addresses
    bytes internal _initcode;

    // Network id
    uint public chainId;

    // Maps hash(sender address, campaign id) to its corresponding proxy address
    mapping (bytes32 => address) public deployed;
        
    // Events
    event Deployed(address payable indexed owner, uint campaignId, address payable proxy, bytes32 salt);
    event Destroyed(address payable owner, address payable proxy);
    event SetMasterCopy(address masterCopy, uint version);

}


// Dependency file: contracts/interfaces/ILinkdropCommon.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropCommon {

    function initialize
    (
        address _owner,
        address payable _linkdropMaster,
        uint _version,
        uint _chainId,
        uint _claimPattern
    )
    external returns (bool);

    function isClaimedLink(address _linkId) external view returns (bool);
    function isCanceledLink(address _linkId) external view returns (bool);
    function paused() external view returns (bool);
    function cancel(address _linkId) external  returns (bool);
    function withdraw() external returns (bool);
    function pause() external returns (bool);
    function unpause() external returns (bool);
    function addSigner(address _linkdropSigner) external payable returns (bool);
    function removeSigner(address _linkdropSigner) external returns (bool);
    function destroy() external;
    function getLinkdropMaster() external view returns (address);
    function getMasterCopyVersion() external view returns (uint);
    function verifyReceiverSignature( address _linkId,
                                      address _receiver,
                                      bytes calldata _signature
                                      )  external view returns (bool);
    receive() external payable;

}


// Dependency file: openzeppelin-solidity/contracts/cryptography/ECDSA.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        // Check the signature length
        if (signature.length != 65) {
            revert("ECDSA: invalid signature length");
        }

        // Divide the signature in r, s and v variables
        bytes32 r;
        bytes32 s;
        uint8 v;

        // ecrecover takes the signature parameters, and the only way to get them
        // currently is to use assembly.
        // solhint-disable-next-line no-inline-assembly
        assembly {
            r := mload(add(signature, 0x20))
            s := mload(add(signature, 0x40))
            v := byte(0, mload(add(signature, 0x60)))
        }

        return recover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover-bytes32-bytes-} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        require(signer != address(0), "ECDSA: invalid signature");

        return signer;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * replicates the behavior of the
     * https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign[`eth_sign`]
     * JSON-RPC method.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }
}


// Dependency file: openzeppelin-solidity/contracts/math/SafeMath.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}


// Dependency file: contracts/factory/LinkdropFactoryCommon.sol

// pragma solidity >=0.6.0 <0.8.0;

// import "contracts/storage/LinkdropFactoryStorage.sol";
// import "contracts/interfaces/ILinkdropCommon.sol";
// import "openzeppelin-solidity/contracts/cryptography/ECDSA.sol";
// import "openzeppelin-solidity/contracts/math/SafeMath.sol";

contract LinkdropFactoryCommon is LinkdropFactoryStorage {
    using SafeMath for uint;

    /**
    * @dev Indicates whether a proxy contract for linkdrop master is deployed or not
    * @param _linkdropMaster Address of linkdrop master
    * @param _campaignId Campaign id
    * @return True if deployed
    */
    function isDeployed(address _linkdropMaster, uint _campaignId) public view returns (bool) {
        return (deployed[salt(_linkdropMaster, _campaignId)] != address(0));
    }

    /**
    * @dev Indicates whether a link is claimed or not
    * @param _linkdropMaster Address of lindkrop master
    * @param _campaignId Campaign id
    * @param _linkId Address corresponding to link key
    * @return True if claimed
    */
    function isClaimedLink(address payable _linkdropMaster, uint _campaignId, address _linkId) public view returns (bool) {

        if (!isDeployed(_linkdropMaster, _campaignId)) {
            return false;
        }
        else {
            address payable proxy = address(uint160(deployed[salt(_linkdropMaster, _campaignId)]));
            return ILinkdropCommon(proxy).isClaimedLink(_linkId);
        }
    }


    /**
    * @dev Function to deploy a proxy contract for msg.sender
    * @param _campaignId Campaign id
    * @param _claimPattern which pattern the campaign will use (mint on claim, transfer pre-minted tokens, etc)
    * @return proxy Proxy contract address
    */
    function deployProxy(uint _campaignId, uint _claimPattern)
    public
    payable
    returns (address payable proxy)
    {
      proxy = _deployProxy(msg.sender, _campaignId, _claimPattern);
    }

    /**
    * @dev Function to deploy a proxy contract for msg.sender and add a new signing key
    * @param _campaignId Campaign id
    * @param _signer Address corresponding to signing key
    * @param _claimPattern which pattern the campaign will use (mint on claim, transfer pre-minted tokens, etc)
    * @return proxy Proxy contract address
    */
    function deployProxyWithSigner(uint _campaignId, address _signer, uint _claimPattern)
    public
    payable
    returns (address payable proxy)
    {
        proxy = _deployProxy(msg.sender, _campaignId, _claimPattern);
        ILinkdropCommon(proxy).addSigner(_signer);
    }

    /**
    * @dev Internal function to deploy a proxy contract for linkdrop master
    * @param _linkdropMaster Address of linkdrop master
    * @param _campaignId Campaign id
    * @param _claimPattern which pattern the campaign will use (mint on claim, transfer pre-minted tokens, etc)
    * @return proxy Proxy contract address
    */
    function _deployProxy(address payable _linkdropMaster, uint _campaignId, uint _claimPattern)
    internal
    returns (address payable proxy)
    {

        require(!isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_ALREADY_DEPLOYED");
        require(_linkdropMaster != address(0), "INVALID_LINKDROP_MASTER_ADDRESS");

        bytes32 salt = salt(_linkdropMaster, _campaignId);
        bytes memory initcode = getInitcode();

        assembly {
            proxy := create2(0, add(initcode, 0x20), mload(initcode), salt)
            if iszero(extcodesize(proxy)) { revert(0, 0) }
        }

        deployed[salt] = proxy;

        // Initialize factory address, linkdrop master address master copy version in proxy contract
        require
        (
            ILinkdropCommon(proxy).initialize
            (
                address(this), // factory address
                _linkdropMaster, // Linkdrop master address
                masterCopyVersion,
                chainId,
                _claimPattern
            ),
            "INITIALIZATION_FAILED"
        );

        // Send funds attached to proxy contract
        proxy.transfer(msg.value);

        emit Deployed(_linkdropMaster, _campaignId, proxy, salt);
        return proxy;
    }

    /**
    * @dev Function to destroy proxy contract, called by proxy owner
    * @param _campaignId Campaign id
    * @return True if destroyed successfully
    */
    function destroyProxy(uint _campaignId)
    public
    returns (bool)
    {
        require(isDeployed(msg.sender, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");
        address payable proxy = address(uint160(deployed[salt(msg.sender, _campaignId)]));
        require(msg.sender == ILinkdropCommon(proxy).getLinkdropMaster(), "NOT_AUTHORIZED");
        ILinkdropCommon(proxy).destroy();
        delete deployed[salt(msg.sender, _campaignId)];
        emit Destroyed(msg.sender, proxy);
        return true;
    }

    /**
    * @dev Function to get bootstrap initcode for generating repeatable contract addresses
    * @return Static bootstrap initcode
    */
    function getInitcode()
    public view
    returns (bytes memory)
    {
        return _initcode;
    }

    /**
    * @dev Function to fetch the actual contract bytecode to install. Called by proxy when executing initcode
    * @return Contract bytecode to install
    */
    function getBytecode()
    public view
    returns (bytes memory)
    {
        return _bytecode;
    }

    /**
    * @dev Function to set new master copy and update contract bytecode to install. Can only be called by factory owner
    * @param _masterCopy Address of linkdrop mastercopy contract to calculate bytecode from
    * @return True if updated successfully
    */
    function setMasterCopy(address payable _masterCopy)
    public onlyOwner
    returns (bool)
    {
        require(_masterCopy != address(0), "INVALID_MASTER_COPY_ADDRESS");
        masterCopyVersion = masterCopyVersion.add(1);

        require
        (
            ILinkdropCommon(_masterCopy).initialize
            (
                address(0), // Owner address
                address(0), // Linkdrop master address
                masterCopyVersion,
                chainId,
                uint(0) // transfer pattern (mint tokens on claim or transfer pre-minted tokens) 
            ),
            "INITIALIZATION_FAILED"
        );

        bytes memory bytecode = abi.encodePacked
        (
            hex"363d3d373d3d3d363d73",
            _masterCopy,
            hex"5af43d82803e903d91602b57fd5bf3"
        );

        _bytecode = bytecode;

        emit SetMasterCopy(_masterCopy, masterCopyVersion);
        return true;
    }

    /**
    * @dev Function to fetch the master copy version installed (or to be installed) to proxy
    * @param _linkdropMaster Address of linkdrop master
    * @param _campaignId Campaign id
    * @return Master copy version
    */
    function getProxyMasterCopyVersion(address _linkdropMaster, uint _campaignId) external view returns (uint) {

        if (!isDeployed(_linkdropMaster, _campaignId)) {
            return masterCopyVersion;
        }
        else {
            address payable proxy = address(uint160(deployed[salt(_linkdropMaster, _campaignId)]));
            return ILinkdropCommon(proxy).getMasterCopyVersion();
        }
    }

    /**
     * @dev Function to hash `_linkdropMaster` and `_campaignId` params. Used as salt when deploying with create2
     * @param _linkdropMaster Address of linkdrop master
     * @param _campaignId Campaign id
     * @return Hash of passed arguments
     */
    function salt(address _linkdropMaster, uint _campaignId) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(_linkdropMaster, _campaignId));
    }
  }


// Dependency file: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol


// pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


// Dependency file: contracts/factory/LinkdropFactoryERC20.sol

// pragma solidity >=0.6.0 <0.8.0;

// import "contracts/interfaces/ILinkdropERC20.sol";
// import "contracts/interfaces/ILinkdropFactoryERC20.sol";
// import "contracts/factory/LinkdropFactoryCommon.sol";
// import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";

contract LinkdropFactoryERC20 is ILinkdropFactoryERC20, LinkdropFactoryCommon {

    /**
    * @dev Function to verify claim params, make sure the link is not claimed or canceled and proxy has sufficient balance
    * @param _weiAmount Amount of wei to be claimed
    * @param _tokenAddress Token address
    * @param _tokenAmount Amount of tokens to be claimed (in atomic value)
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function checkClaimParams
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes memory _linkdropSignerSignature,
        address _receiver,
        bytes memory _receiverSignature
    )
    public
    override      
    view
    returns (bool)
    {
        // Make sure proxy contract is deployed
        require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");

        return ILinkdropERC20(deployed[salt(_linkdropMaster, _campaignId)]).checkClaimParams
        (
            _weiAmount,
            _tokenAddress,
            _tokenAmount,
            _expiration,
            _linkId,
            _linkdropSignerSignature,
            _receiver,
            _receiverSignature
        );
    }

    /**
    * @dev Function to claim ETH and/or ERC20 tokens
    * @param _weiAmount Amount of wei to be claimed
    * @param _tokenAddress Token address
    * @param _tokenAmount Amount of tokens to be claimed (in atomic value)
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function claim
    (
        uint _weiAmount,
        address _tokenAddress,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    override
    returns (bool)
    {
        // Make sure proxy contract is deployed
        require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");

        // Call claim function in the context of proxy contract
        ILinkdropERC20(deployed[salt(_linkdropMaster, _campaignId)]).claim
          (
           _weiAmount,
           _tokenAddress,
           _tokenAmount,
           _expiration,
            _linkId,
           _linkdropSignerSignature,
           _receiver,
           _receiverSignature
           );
          
          return true;
    }   
}


// Dependency file: contracts/interfaces/ILinkdropERC721.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropERC721 {

    function verifyLinkdropSignerSignatureERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        bytes calldata _signature
    )
    external view returns (bool);

    function verifyReceiverSignatureERC721
    (
        address _linkId,
	    address _receiver,
		bytes calldata _signature
    )
    external view returns (bool);

    function checkClaimParamsERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
    )
    external view returns (bool);

    function claimERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
      external
      payable
      returns (bool);

}


// Dependency file: contracts/interfaces/ILinkdropFactoryERC721.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropFactoryERC721 {

    function checkClaimParamsERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
    )
    external view
    returns (bool);

    function claimERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    returns (bool);
}


// Dependency file: openzeppelin-solidity/contracts/introspection/IERC165.sol


// pragma solidity >=0.6.0 <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);
}


// Dependency file: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol


// pragma solidity >=0.6.2 <0.8.0;

// import "openzeppelin-solidity/contracts/introspection/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`, 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
      * @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;
}


// Dependency file: contracts/factory/LinkdropFactoryERC721.sol

// pragma solidity >=0.6.0 <0.8.0;

// import "contracts/interfaces/ILinkdropERC721.sol";
// import "contracts/interfaces/ILinkdropFactoryERC721.sol";
// import "contracts/factory/LinkdropFactoryCommon.sol";
// import "openzeppelin-solidity/contracts/token/ERC721/IERC721.sol";

contract LinkdropFactoryERC721 is ILinkdropFactoryERC721, LinkdropFactoryCommon {

    /**
    * @dev Function to verify claim params, make sure the link is not claimed or canceled and proxy is allowed to spend token
    * @param _weiAmount Amount of wei to be claimed
    * @param _nftAddress NFT address
    * @param _tokenId Token id to be claimed
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function checkClaimParamsERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes memory _linkdropSignerSignature,
        address _receiver,
        bytes memory _receiverSignature
    )
    public
    override
    view
    returns (bool)
    {
        // Make sure proxy contract is deployed
        require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");

        return ILinkdropERC721(deployed[salt(_linkdropMaster, _campaignId)]).checkClaimParamsERC721
        (
            _weiAmount,
            _nftAddress,
            _tokenId,
            _expiration,
            _linkId,
            _linkdropSignerSignature,
            _receiver,
            _receiverSignature
        );
    }

    /**
    * @dev Function to claim ETH and/or ERC721 token
    * @param _weiAmount Amount of wei to be claimed
    * @param _nftAddress NFT address
    * @param _tokenId Token id to be claimed
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function claimERC721
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    override
    returns (bool)
    {
        // Make sure proxy contract is deployed
        require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");
        // Call claim function in the context of proxy contract
        ILinkdropERC721(deployed[salt(_linkdropMaster, _campaignId)]).claimERC721
          (
            _weiAmount,
            _nftAddress,
            _tokenId,
            _expiration,
            _linkId,
            _linkdropSignerSignature,
            _receiver,
            _receiverSignature
        );

        return true;
    }
}


// Dependency file: contracts/interfaces/ILinkdropERC1155.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropERC1155 {

    function verifyLinkdropSignerSignatureERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        bytes calldata _signature
    )
    external view returns (bool);

    function checkClaimParamsERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,        
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
     )
    external view returns (bool);

    function claimERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external payable returns (bool);
}


// Dependency file: contracts/interfaces/ILinkdropFactoryERC1155.sol

// pragma solidity >=0.6.0 <0.8.0;

interface ILinkdropFactoryERC1155 {

    function checkClaimParamsERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address _receiver,
        bytes calldata _receiverSignature
    )
    external view
    returns (bool);

    function claimERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    returns (bool);
}


// Dependency file: openzeppelin-solidity/contracts/token/ERC1155/IERC1155.sol


// pragma solidity >=0.6.2 <0.8.0;

// import "openzeppelin-solidity/contracts/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;
}


// Dependency file: contracts/factory/LinkdropFactoryERC1155.sol

// pragma solidity >=0.6.0 <0.8.0;

// import "contracts/interfaces/ILinkdropERC1155.sol";
// import "contracts/interfaces/ILinkdropFactoryERC1155.sol";
// import "contracts/factory/LinkdropFactoryCommon.sol";
// import "openzeppelin-solidity/contracts/token/ERC1155/IERC1155.sol";

contract LinkdropFactoryERC1155 is ILinkdropFactoryERC1155, LinkdropFactoryCommon {

    /**
    * @dev Function to verify claim params, make sure the link is not claimed or canceled and proxy is allowed to spend token
    * @param _weiAmount Amount of wei to be claimed
    * @param _nftAddress NFT address
    * @param _tokenId Token id to be claimed
    * @param _tokenAmount Token id to be claimed
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function checkClaimParamsERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes memory _linkdropSignerSignature,
        address _receiver,
        bytes memory _receiverSignature
    )
    public
    override
    view
    returns (bool)
    {
        // Make sure proxy contract is deployed
        require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");

        return ILinkdropERC1155(deployed[salt(_linkdropMaster, _campaignId)]).checkClaimParamsERC1155
        (
            _weiAmount,
            _nftAddress,
            _tokenId,
            _tokenAmount,
            _expiration,
            _linkId,
            _linkdropSignerSignature,
            _receiver,
            _receiverSignature
        );
    }

    /**
    * @dev Function to claim ETH and/or ERC1155 token
    * @param _weiAmount Amount of wei to be claimed
    * @param _nftAddress NFT address
    * @param _tokenId Token id to be claimed
    * @param _tokenAmount Token id to be claimed
    * @param _expiration Unix timestamp of link expiration time
    * @param _linkId Address corresponding to link key
    * @param _linkdropMaster Address corresponding to linkdrop master key
    * @param _campaignId Campaign id
    * @param _linkdropSignerSignature ECDSA signature of linkdrop signer
    * @param _receiver Address of linkdrop receiver
    * @param _receiverSignature ECDSA signature of linkdrop receiver
    * @return True if success
    */
    function claimERC1155
    (
        uint _weiAmount,
        address _nftAddress,
        uint _tokenId,
        uint _tokenAmount,
        uint _expiration,
        address _linkId,
        address payable _linkdropMaster,
        uint _campaignId,
        bytes calldata _linkdropSignerSignature,
        address payable _receiver,
        bytes calldata _receiverSignature
    )
    external
    override
    returns (bool)
    {
      
      // Make sure proxy contract is deployed
      require(isDeployed(_linkdropMaster, _campaignId), "LINKDROP_PROXY_CONTRACT_NOT_DEPLOYED");
      
      // Call claim function in the context of proxy contract
      ILinkdropERC1155(deployed[salt(_linkdropMaster, _campaignId)]).claimERC1155
        (
         _weiAmount,
         _nftAddress,
         _tokenId,
         _tokenAmount,
         _expiration,
         _linkId,
         _linkdropSignerSignature,
         _receiver,
         _receiverSignature
       );

      return true;
    }

}


// Dependency file: contracts/fee-manager/FeeManager.sol

// pragma solidity >=0.6.0 <0.8.0;

// import "openzeppelin-solidity/contracts/access/Ownable.sol";
// import "openzeppelin-solidity/contracts/math/SafeMath.sol";
// import "contracts/interfaces/IFeeManager.sol";


contract FeeManager is IFeeManager, Ownable  {
  using SafeMath for uint;  
  mapping (address => bool) internal _whitelisted;
  uint public fee; // fee paid by campaign creator if fee is sponsored
  uint public claimerFee;  // fee to paid by receiver if claim is not sponsored 
  address payable public override feeReceiver;
  
  constructor() public {
    fee = 0 ether;
    claimerFee = 0 ether;
    feeReceiver = payable(address(this));
  }
  
  function cancelWhitelist(address _addr) public override onlyOwner returns (bool) {
    _whitelisted[_addr] = false;
    return true;
  }

  function whitelist(address _addr) public override onlyOwner returns (bool) {
    _whitelisted[_addr] = true;
    return true;
  }
  
  function isWhitelisted(address _addr) public view override returns (bool) {
    return _whitelisted[_addr];
  }
  
  function changeFeeReceiver(address payable _addr) public override onlyOwner returns (bool) {
    feeReceiver = _addr;
    return true;
  }
  
  function updateFee(uint _fee) public override onlyOwner returns (bool) {
    fee = _fee;
    return true;
  }

  function updateClaimerFee(uint _claimerFee) public override onlyOwner returns (bool) {
    claimerFee = _claimerFee;
    return true;
  }  

  function withdraw() external override onlyOwner returns (bool) {
    msg.sender.transfer(address(this).balance);
    return true;
  }

  function calculateFee(
                        address _linkdropMaster,
                        address /* tokenAddress */,
                        address _receiver) public view override returns (uint) {
    if (isWhitelisted(_linkdropMaster)) {
      return 0;
    }

    if (_receiver == address(tx.origin)) {
      return claimerFee;
    }
        
    return fee;
  }
 
  /**
   * @dev Fallback function to accept ETH
   */
  receive() external payable {}  
}


// Root file: contracts/factory/LinkdropFactory.sol

pragma solidity >=0.6.0 <0.8.0;

// import "contracts/factory/LinkdropFactoryERC20.sol";
// import "contracts/factory/LinkdropFactoryERC721.sol";
// import "contracts/factory/LinkdropFactoryERC1155.sol";
// import "contracts/fee-manager/FeeManager.sol";

contract LinkdropFactory is LinkdropFactoryERC20, LinkdropFactoryERC721, LinkdropFactoryERC1155 {

  // Address of contract deploying proxies
  FeeManager public feeManager;
  
  /**
   * @dev Constructor that sets bootstap initcode, factory owner, chainId and master copy
   * @param _masterCopy Linkdrop mastercopy contract address to calculate bytecode from
   * @param _chainId Chain id
   */
  constructor(address payable _masterCopy, uint _chainId) public {
    _initcode = (hex"6352c7420d6000526103ff60206004601c335afa6040516060f3");
    chainId = _chainId;
    setMasterCopy(_masterCopy);        
    feeManager = new FeeManager();
    feeManager.transferOwnership(address(msg.sender));
  }
    
  function isWhitelisted(address _addr) public view returns (bool) {
    return feeManager.isWhitelisted(_addr);
  }    
}

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