Contract Name:
LinkdropMastercopy
Contract Source Code:
File 1 of 1 : LinkdropMastercopy
/**
*Submitted for verification at polygonscan.com on 2022-06-30
*/
// Dependency file: openzeppelin-solidity/contracts/introspection/IERC165.sol
// SPDX-License-Identifier: GPL-3.0
// 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/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: 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: contracts/storage/LinkdropStorage.sol
// pragma solidity >=0.6.0 <0.8.0;
contract LinkdropStorage {
// Address of owner deploying this contract (usually factory)
address public owner;
// Address corresponding to linkdrop master key
address payable public linkdropMaster;
// Version of mastercopy contract
uint public version;
// Network id
uint public chainId;
// Indicates whether an address corresponds to linkdrop signing key
mapping (address => bool) public isLinkdropSigner;
// Indicates who the link is claimed to
mapping (address => address) public claimedTo;
// Indicates whether the link is canceled or not
mapping (address => bool) internal _canceled;
// Indicates whether the initializer function has been called or not
bool public initialized;
// Indicates whether the contract is paused or not
bool internal _paused;
// Events
event Canceled(address linkId);
event Claimed(address indexed linkId, uint ethAmount, address indexed token, uint tokenAmount, address receiver);
event ClaimedERC721(address indexed linkId, uint ethAmount, address indexed nft, uint tokenId, address receiver);
event ClaimedERC1155(address indexed linkId, uint ethAmount, address indexed nft, uint tokenId, uint tokenAmount, address receiver);
event Paused();
event Unpaused();
event AddedSigningKey(address linkdropSigner);
event RemovedSigningKey(address linkdropSigner);
}
// 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
)
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 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/token/ERC1155/IERC1155.sol
// pragma solidity >=0.6.2 <0.8.0;
// 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;
}
// Dependency file: 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 returns (bool);
}
// Dependency file: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol
// pragma solidity >=0.6.2 <0.8.0;
// import "../../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: 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 returns (bool);
}
// Dependency file: contracts/linkdrop/LinkdropCommon.sol
// pragma solidity >=0.6.0 <0.8.0;
// import "../interfaces/ILinkdropCommon.sol";
// import "../storage/LinkdropStorage.sol";
// import "openzeppelin-solidity/contracts/cryptography/ECDSA.sol";
// import "openzeppelin-solidity/contracts/math/SafeMath.sol";
contract LinkdropCommon is ILinkdropCommon, LinkdropStorage {
/**
* @dev Function called only once to set owner, linkdrop master, contract version and chain id
* @param _owner Owner address
* @param _linkdropMaster Address corresponding to master key
* @param _version Contract version
* @param _chainId Network id
*/
function initialize
(
address _owner,
address payable _linkdropMaster,
uint _version,
uint _chainId
)
public
override
returns (bool)
{
require(!initialized, "LINKDROP_PROXY_CONTRACT_ALREADY_INITIALIZED");
owner = _owner;
linkdropMaster = _linkdropMaster;
isLinkdropSigner[linkdropMaster] = true;
version = _version;
chainId = _chainId;
initialized = true;
return true;
}
modifier onlyLinkdropMaster() {
require(msg.sender == linkdropMaster, "ONLY_LINKDROP_MASTER");
_;
}
modifier onlyLinkdropMasterOrFactory() {
require (msg.sender == linkdropMaster || msg.sender == owner, "ONLY_LINKDROP_MASTER_OR_FACTORY");
_;
}
modifier onlyFactory() {
require(msg.sender == owner, "ONLY_FACTORY");
_;
}
modifier whenNotPaused() {
require(!paused(), "LINKDROP_PROXY_CONTRACT_PAUSED");
_;
}
/**
* @dev Indicates whether a link is claimed or not
* @param _linkId Address corresponding to link key
* @return True if claimed
*/
function isClaimedLink(address _linkId) public override view returns (bool) {
return claimedTo[_linkId] != address(0);
}
/**
* @dev Indicates whether a link is canceled or not
* @param _linkId Address corresponding to link key
* @return True if canceled
*/
function isCanceledLink(address _linkId) public override view returns (bool) {
return _canceled[_linkId];
}
/**
* @dev Indicates whether a contract is paused or not
* @return True if paused
*/
function paused() public override view returns (bool) {
return _paused;
}
/**
* @dev Function to cancel a link, can only be called by linkdrop master
* @param _linkId Address corresponding to link key
* @return True if success
*/
function cancel(address _linkId) external override onlyLinkdropMaster returns (bool) {
require(!isClaimedLink(_linkId), "LINK_CLAIMED");
_canceled[_linkId] = true;
emit Canceled(_linkId);
return true;
}
/**
* @dev Function to withdraw eth to linkdrop master, can only be called by linkdrop master
* @return True if success
*/
function withdraw() external override onlyLinkdropMaster returns (bool) {
linkdropMaster.transfer(address(this).balance);
return true;
}
/**
* @dev Function to pause contract, can only be called by linkdrop master
* @return True if success
*/
function pause() external override onlyLinkdropMaster whenNotPaused returns (bool) {
_paused = true;
emit Paused();
return true;
}
/**
* @dev Function to unpause contract, can only be called by linkdrop master
* @return True if success
*/
function unpause() external override onlyLinkdropMaster returns (bool) {
require(paused(), "LINKDROP_CONTRACT_ALREADY_UNPAUSED");
_paused = false;
emit Unpaused();
return true;
}
/**
* @dev Function to add new signing key, can only be called by linkdrop master or owner (factory contract)
* @param _linkdropSigner Address corresponding to signing key
* @return True if success
*/
function addSigner(address _linkdropSigner) external override payable onlyLinkdropMasterOrFactory returns (bool) {
require(_linkdropSigner != address(0), "INVALID_LINKDROP_SIGNER_ADDRESS");
isLinkdropSigner[_linkdropSigner] = true;
return true;
}
/**
* @dev Function to remove signing key, can only be called by linkdrop master
* @param _linkdropSigner Address corresponding to signing key
* @return True if success
*/
function removeSigner(address _linkdropSigner) external override onlyLinkdropMaster returns (bool) {
require(_linkdropSigner != address(0), "INVALID_LINKDROP_SIGNER_ADDRESS");
isLinkdropSigner[_linkdropSigner] = false;
return true;
}
/**
* @dev Function to destroy this contract, can only be called by owner (factory) or linkdrop master
* Withdraws all the remaining ETH to linkdrop master
*/
function destroy() external override onlyLinkdropMasterOrFactory {
selfdestruct(linkdropMaster);
}
/**
* @dev Function for other contracts to be able to fetch the mastercopy version
* @return Master copy version
*/
function getMasterCopyVersion() external override view returns (uint) {
return version;
}
/**
* @dev Function to verify linkdrop receiver's signature
* @param _linkId Address corresponding to link key
* @param _receiver Address of linkdrop receiver
* @param _signature ECDSA signature of linkdrop receiver
* @return True if signed with link key
*/
function verifyReceiverSignature
(
address _linkId,
address _receiver,
bytes memory _signature
)
public view
override
returns (bool)
{
bytes32 prefixedHash = ECDSA.toEthSignedMessageHash(keccak256(abi.encodePacked(_receiver)));
address signer = ECDSA.recover(prefixedHash, _signature);
return signer == _linkId;
}
/**
* @dev Fallback function to accept ETH
*/
receive() external override payable {}
}
// Dependency file: contracts/interfaces/ILinkdropERC20.sol
// 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 returns (bool);
}
// 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/linkdrop/LinkdropERC1155.sol
// pragma solidity >=0.6.0 <0.8.0;
// import "./LinkdropCommon.sol";
// import "../../interfaces/ILinkdropERC1155.sol";
// import "openzeppelin-solidity/contracts/token/ERC1155/IERC1155.sol";
contract LinkdropERC1155 is ILinkdropERC1155, LinkdropCommon {
using SafeMath for uint;
/**
* @dev Function to verify linkdrop signer's signature
* @param _weiAmount Amount of wei to be claimed
* @param _nftAddress NFT address
* @param _tokenId Token id to be claimed
* @param _tokenAmount Token amount to be claimed
* @param _expiration Unix timestamp of link expiration time
* @param _linkId Address corresponding to link key
* @param _signature ECDSA signature of linkdrop signer
* @return True if signed with linkdrop signer's private key
*/
function verifyLinkdropSignerSignatureERC1155
(
uint _weiAmount,
address _nftAddress,
uint _tokenId,
uint _tokenAmount,
uint _expiration,
address _linkId,
bytes memory _signature
)
public view
override
returns (bool)
{
bytes32 prefixedHash = ECDSA.toEthSignedMessageHash
(
keccak256
(
abi.encodePacked
(
_weiAmount,
_nftAddress,
_tokenId,
_tokenAmount,
_expiration,
version,
chainId,
_linkId,
address(this)
)
)
);
address signer = ECDSA.recover(prefixedHash, _signature);
return isLinkdropSigner[signer];
}
/**
* @dev Function to verify claim params and make sure the link is not claimed or canceled
* @param _weiAmount Amount of wei to be claimed
* @param _nftAddress NFT address
* @param _tokenId Token id to be claimed
* @param _tokenAmount Token amount to be claimed
* @param _expiration Unix timestamp of link expiration time
* @param _linkId Address corresponding to link key
* @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,
bytes memory _linkdropSignerSignature,
address _receiver,
bytes memory _receiverSignature
)
public view
override
whenNotPaused
returns (bool)
{
// Make sure nft address is not equal to address(0)
require(_nftAddress != address(0), "INVALID_NFT_ADDRESS");
// Make sure link is not claimed
require(isClaimedLink(_linkId) == false, "LINK_CLAIMED");
// Make sure link is not canceled
require(isCanceledLink(_linkId) == false, "LINK_CANCELED");
// Make sure link is not expired
require(_expiration >= now, "LINK_EXPIRED");
// Make sure eth amount is available for this contract
require(address(this).balance >= _weiAmount, "INSUFFICIENT_ETHERS");
// Make sure linkdrop master has enough tokens of corresponding tokenId
require(IERC1155(_nftAddress).balanceOf(linkdropMaster, _tokenId) >= _tokenAmount, "LINKDROP_MASTER_DOES_NOT_HAVE_ENOUGH_TOKENS");
// Verify that link key is legit and signed by linkdrop signer's private key
require
(
verifyLinkdropSignerSignatureERC1155
(
_weiAmount,
_nftAddress,
_tokenId,
_tokenAmount,
_expiration,
_linkId,
_linkdropSignerSignature
),
"INVALID_LINKDROP_SIGNER_SIGNATURE"
);
// Verify that receiver address is signed by ephemeral key assigned to claim link (link key)
require
(
verifyReceiverSignature(_linkId, _receiver, _receiverSignature),
"INVALID_RECEIVER_SIGNATURE"
);
return true;
}
/**
* @dev Function to claim ETH and/or ERC1155 token. Can only be called when contract is not paused
* @param _weiAmount Amount of wei to be claimed
* @param _nftAddress NFT address
* @param _tokenId Token id to be claimed
* @param _tokenAmount Token amount to be claimed
* @param _expiration Unix timestamp of link expiration time
* @param _linkId Address corresponding to link key
* @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,
bytes calldata _linkdropSignerSignature,
address payable _receiver,
bytes calldata _receiverSignature
)
external
override
whenNotPaused
returns (bool)
{
// Make sure params are valid
require
(
checkClaimParamsERC1155
(
_weiAmount,
_nftAddress,
_tokenId,
_tokenAmount,
_expiration,
_linkId,
_linkdropSignerSignature,
_receiver,
_receiverSignature
),
"INVALID_CLAIM_PARAMS"
);
// Mark link as claimed
claimedTo[_linkId] = _receiver;
// Make sure transfer succeeds
require(_transferFundsERC1155(_weiAmount, _nftAddress, _tokenId, _tokenAmount, _receiver), "TRANSFER_FAILED");
// Log claim
emit ClaimedERC1155(_linkId, _weiAmount, _nftAddress, _tokenId, _tokenAmount, _receiver);
return true;
}
/**
* @dev Internal function to transfer ethers and/or ERC1155 tokens
* @param _weiAmount Amount of wei to be claimed
* @param _nftAddress NFT address
* @param _tokenId token id to transfer
* @param _tokenAmount Token amount to transfer
* @param _receiver Address to transfer funds to
* @return True if success
*/
function _transferFundsERC1155
(
uint _weiAmount,
address _nftAddress,
uint _tokenId,
uint _tokenAmount,
address payable _receiver
)
internal returns (bool) {
// Transfer ethers
if (_weiAmount > 0) {
_receiver.transfer(_weiAmount);
}
// Transfer NFT
IERC1155(_nftAddress).safeTransferFrom(linkdropMaster, _receiver, _tokenId, _tokenAmount, new bytes(0));
return true;
}
}
// Dependency file: contracts/linkdrop/LinkdropERC721.sol
// pragma solidity >=0.6.0 <0.8.0;
// import "./LinkdropCommon.sol";
// import "../../interfaces/ILinkdropERC721.sol";
// import "openzeppelin-solidity/contracts/token/ERC721/IERC721.sol";
contract LinkdropERC721 is ILinkdropERC721, LinkdropCommon {
using SafeMath for uint;
/**
* @dev Function to verify linkdrop signer's signature
* @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 _signature ECDSA signature of linkdrop signer
* @return True if signed with linkdrop signer's private key
*/
function verifyLinkdropSignerSignatureERC721
(
uint _weiAmount,
address _nftAddress,
uint _tokenId,
uint _expiration,
address _linkId,
bytes memory _signature
)
public view
override
returns (bool)
{
bytes32 prefixedHash = ECDSA.toEthSignedMessageHash
(
keccak256
(
abi.encodePacked
(
_weiAmount,
_nftAddress,
_tokenId,
_expiration,
version,
chainId,
_linkId,
address(this)
)
)
);
address signer = ECDSA.recover(prefixedHash, _signature);
return isLinkdropSigner[signer];
}
/**
* @dev Function to verify linkdrop receiver's signature
* @param _linkId Address corresponding to link key
* @param _receiver Address of linkdrop receiver
* @param _signature ECDSA signature of linkdrop receiver
* @return True if signed with link key
*/
function verifyReceiverSignatureERC721
(
address _linkId,
address _receiver,
bytes memory _signature
)
public view
override
returns (bool)
{
bytes32 prefixedHash = ECDSA.toEthSignedMessageHash(keccak256(abi.encodePacked(_receiver)));
address signer = ECDSA.recover(prefixedHash, _signature);
return signer == _linkId;
}
/**
* @dev Function to verify claim params and make sure the link is not claimed or canceled
* @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 _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,
bytes memory _linkdropSignerSignature,
address _receiver,
bytes memory _receiverSignature
)
public view
override
whenNotPaused
returns (bool)
{
// Make sure nft address is not equal to address(0)
require(_nftAddress != address(0), "INVALID_NFT_ADDRESS");
// Make sure link is not claimed
require(isClaimedLink(_linkId) == false, "LINK_CLAIMED");
// Make sure link is not canceled
require(isCanceledLink(_linkId) == false, "LINK_CANCELED");
// Make sure link is not expired
require(_expiration >= now, "LINK_EXPIRED");
// Make sure eth amount is available for this contract
require(address(this).balance >= _weiAmount, "INSUFFICIENT_ETHERS");
// Make sure linkdrop master is owner of token
require(IERC721(_nftAddress).ownerOf(_tokenId) == linkdropMaster, "LINKDROP_MASTER_DOES_NOT_OWN_TOKEN_ID");
// Verify that link key is legit and signed by linkdrop signer's private key
require
(
verifyLinkdropSignerSignatureERC721
(
_weiAmount,
_nftAddress,
_tokenId,
_expiration,
_linkId,
_linkdropSignerSignature
),
"INVALID_LINKDROP_SIGNER_SIGNATURE"
);
// Verify that receiver address is signed by ephemeral key assigned to claim link (link key)
require
(
verifyReceiverSignatureERC721(_linkId, _receiver, _receiverSignature),
"INVALID_RECEIVER_SIGNATURE"
);
return true;
}
/**
* @dev Function to claim ETH and/or ERC721 token. Can only be called when contract is not paused
* @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 _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,
bytes calldata _linkdropSignerSignature,
address payable _receiver,
bytes calldata _receiverSignature
)
external
override
onlyFactory
whenNotPaused
returns (bool)
{
// Make sure params are valid
require
(
checkClaimParamsERC721
(
_weiAmount,
_nftAddress,
_tokenId,
_expiration,
_linkId,
_linkdropSignerSignature,
_receiver,
_receiverSignature
),
"INVALID_CLAIM_PARAMS"
);
// Mark link as claimed
claimedTo[_linkId] = _receiver;
// Make sure transfer succeeds
require(_transferFundsERC721(_weiAmount, _nftAddress, _tokenId, _receiver), "TRANSFER_FAILED");
// Log claim
emit ClaimedERC721(_linkId, _weiAmount, _nftAddress, _tokenId, _receiver);
return true;
}
/**
* @dev Internal function to transfer ethers and/or ERC721 tokens
* @param _weiAmount Amount of wei to be claimed
* @param _nftAddress NFT address
* @param _tokenId Amount of tokens to be claimed (in atomic value)
* @param _receiver Address to transfer funds to
* @return True if success
*/
function _transferFundsERC721
(
uint _weiAmount,
address _nftAddress,
uint _tokenId,
address payable _receiver
)
internal returns (bool)
{
// Transfer ethers
if (_weiAmount > 0) {
_receiver.transfer(_weiAmount);
}
// Transfer NFT
IERC721(_nftAddress).transferFrom(linkdropMaster, _receiver, _tokenId);
return true;
}
}
// Dependency file: contracts/linkdrop/LinkdropERC20.sol
// pragma solidity >=0.6.0 <0.8.0;
// import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";
// import "../interfaces/ILinkdropERC20.sol";
// import "./LinkdropCommon.sol";
contract LinkdropERC20 is ILinkdropERC20, LinkdropCommon {
using SafeMath for uint;
/**
* @dev Function to verify linkdrop signer's signature
* @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 _signature ECDSA signature of linkdrop signer
* @return True if signed with linkdrop signer's private key
*/
function verifyLinkdropSignerSignature
(
uint _weiAmount,
address _tokenAddress,
uint _tokenAmount,
uint _expiration,
address _linkId,
bytes memory _signature
)
public view
override
returns (bool)
{
bytes32 prefixedHash = ECDSA.toEthSignedMessageHash
(
keccak256
(
abi.encodePacked
(
_weiAmount,
_tokenAddress,
_tokenAmount,
_expiration,
version,
chainId,
_linkId,
address(this)
)
)
);
address signer = ECDSA.recover(prefixedHash, _signature);
return isLinkdropSigner[signer];
}
/**
* @dev Function to verify claim params and make sure the link is not claimed or canceled
* @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 _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,
bytes memory _linkdropSignerSignature,
address _receiver,
bytes memory _receiverSignature
)
public view
override
whenNotPaused
returns (bool)
{
// If tokens are being claimed
if (_tokenAmount > 0) {
require(_tokenAddress != address(0), "INVALID_TOKEN_ADDRESS");
}
// Make sure link is not claimed
require(isClaimedLink(_linkId) == false, "LINK_CLAIMED");
// Make sure link is not canceled
require(isCanceledLink(_linkId) == false, "LINK_CANCELED");
// Make sure link is not expired
require(_expiration >= now, "LINK_EXPIRED");
// Make sure eth amount is available for this contract
require(address(this).balance >= _weiAmount, "INSUFFICIENT_ETHERS");
// Make sure tokens are available for this contract
if (_tokenAddress != address(0)) {
require
(
IERC20(_tokenAddress).balanceOf(linkdropMaster) >= _tokenAmount,
"INSUFFICIENT_TOKENS"
);
require
(
IERC20(_tokenAddress).allowance(linkdropMaster, address(this)) >= _tokenAmount, "INSUFFICIENT_ALLOWANCE"
);
}
// Verify that link key is legit and signed by linkdrop signer
require
(
verifyLinkdropSignerSignature
(
_weiAmount,
_tokenAddress,
_tokenAmount,
_expiration,
_linkId,
_linkdropSignerSignature
),
"INVALID_LINKDROP_SIGNER_SIGNATURE"
);
// Verify that receiver address is signed by ephemeral key assigned to claim link (link key)
require
(
verifyReceiverSignature(_linkId, _receiver, _receiverSignature),
"INVALID_RECEIVER_SIGNATURE"
);
return true;
}
/**
* @dev Function to claim ETH and/or ERC20 tokens. Can only be called when contract is not paused
* @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 _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,
bytes calldata _linkdropSignerSignature,
address payable _receiver,
bytes calldata _receiverSignature
)
external
override
onlyFactory
whenNotPaused
returns (bool)
{
// Make sure params are valid
require
(
checkClaimParams
(
_weiAmount,
_tokenAddress,
_tokenAmount,
_expiration,
_linkId,
_linkdropSignerSignature,
_receiver,
_receiverSignature
),
"INVALID_CLAIM_PARAMS"
);
// Mark link as claimed
claimedTo[_linkId] = _receiver;
// Make sure transfer succeeds
require(_transferFunds(_weiAmount, _tokenAddress, _tokenAmount, _receiver), "TRANSFER_FAILED");
// Emit claim event
emit Claimed(_linkId, _weiAmount, _tokenAddress, _tokenAmount, _receiver);
return true;
}
/**
* @dev Internal function to transfer ethers 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 _receiver Address to transfer funds to
* @return True if success
*/
function _transferFunds
(
uint _weiAmount,
address _tokenAddress,
uint _tokenAmount,
address payable _receiver
)
internal returns (bool)
{
// Transfer ethers
if (_weiAmount > 0) {
_receiver.transfer(_weiAmount);
}
// Transfer tokens
if (_tokenAmount > 0) {
IERC20(_tokenAddress).transferFrom(linkdropMaster, _receiver, _tokenAmount);
}
return true;
}
}
pragma solidity >=0.6.0 <0.8.0;
// import "./LinkdropERC20.sol";
// import "./LinkdropERC721.sol";
// import "./LinkdropERC1155.sol";
contract LinkdropMastercopy is LinkdropERC20, LinkdropERC721, LinkdropERC1155 {
}