Contract Name:
VaultHandlerV7a
Contract Source Code:
/**
*Submitted for verification at Etherscan.io on 2021-07-14
*/
// ___________ ___. .__
// \_ _____/ _____\_ |__ | | ____ _____
// | __)_ / \| __ \| | _/ __ \ / \
// | \ Y Y \ \_\ \ |_\ ___/| Y Y \
// /_______ /__|_| /___ /____/\___ >__|_| /
// \/ \/ \/ \/ \/
// ____ ____ .__ __
// \ \ / /____ __ __| |_/ |_
// \ Y /\__ \ | | \ |\ __\
// \ / / __ \| | / |_| |
// \___/ (____ /____/|____/__|
// \/
// ___ ___ .___.__ _________ a
// / | \_____ ____ __| _/| | ___________ ___ __ | ____ /
// / ~ \__ \ / \ / __ | | | _/ __ \_ __ \ \ \/ / / /
// \ Y // __ \| | \/ /_/ | | |_\ ___/| | \/ \ / / /
// \___|_ /(____ /___| /\____ | |____/\___ >__| \_/ /_/
// \/ \/ \/ \/ \/
// File: browser/ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor () {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}
// File: browser/IERC20Token.sol
pragma solidity ^0.8.4;
interface IERC20Token {
function transfer(address to, uint256 value) external returns (bool);
function approve(address spender, uint256 value) external returns (bool);
function transferFrom(address from, address to, uint256 value) external returns (bool);
function totalSupply() external view returns (uint256);
function balanceOf(address who) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: browser/SafeMath.sol
pragma solidity ^0.8.4;
/**
* @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, 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) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* 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);
uint256 c = a - b;
return c;
}
/**
* @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) {
// 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 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts 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) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts 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) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: browser/VaultHandler_v4.sol
pragma solidity ^0.8.4;
interface IClaimed {
function isClaimed(address nftAddress, uint tokenId, bytes32[] calldata proof) external returns(bool);
function claim(address nftAddress, uint tokenId, address _claimedBy) external;
}
pragma experimental ABIEncoderV2;
pragma solidity ^0.8.4;
interface IERC721 {
function burn(uint256 tokenId) external;
function transferFrom(address from, address to, uint256 tokenId) external;
function mint( address _to, uint256 _tokenId, string calldata _uri, string calldata _payload) external;
function changeName(string calldata name, string calldata symbol) external;
function updateTokenUri(uint256 _tokenId,string memory _uri) external;
function tokenPayload(uint256 _tokenId) external view returns (string memory);
function ownerOf(uint256 _tokenId) external returns (address _owner);
function getApproved(uint256 _tokenId) external returns (address);
function safeTransferFrom(address _from, address _to, uint256 _tokenId) external;
}
interface Ownable {
function transferOwnership(address newOwner) external;
}
interface BasicERC20 {
function burn(uint256 value) external;
function mint(address account, uint256 amount) external;
function decimals() external view returns (uint8);
}
contract Context {
constructor() {}
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return payable(msg.sender);
}
}
contract Bridged is Context {
using SafeMath for uint256;
using SafeMath for uint8;
using SafeMath for uint;
address public paymentAddress;
mapping(uint => bool) public chainIds;
mapping(uint => uint256) public chainBalances;
constructor () {
chainIds[1] = true;
chainBalances[1] = 200000000000000000;
chainIds[137] = true;
chainBalances[137] = 200000000000000000;
chainIds[80001] = true;
chainBalances[80001] = 200000000000000000;
chainIds[100] = true;
chainBalances[100] = 200000000000000000;
chainIds[56] = true;
chainBalances[56] = 200000000000000000;
chainIds[250] = true;
chainBalances[250] = 200000000000000000;
}
function transferToChain(uint chainId, uint256 amount) public returns (bool) {
require(chainIds[chainId], 'Invalid Chain ID');
IERC20Token paymentToken = IERC20Token(paymentAddress);
require(paymentToken.allowance(_msgSender(), address(this)) >= amount, 'Handler unable to spend ');
require(paymentToken.transferFrom(_msgSender(), address(this), amount), 'Transfer ERROR');
BasicERC20(paymentAddress).burn(amount);
chainBalances[chainId] = chainBalances[chainId].add(amount);
emit BridgeDeposit(_msgSender(), amount, chainId);
return true;
}
function _transferFromChain(address _to, uint chainId, uint256 amount) internal returns (bool) {
require(chainBalances[chainId] >= amount, 'Can not transfer more than deposited');
require(chainIds[chainId], 'Invalid Chain ID');
BasicERC20 paymentToken = BasicERC20(paymentAddress);
paymentToken.mint(_to, amount);
chainBalances[chainId] = chainBalances[chainId].sub(amount);
emit BridgeWithdrawal(_msgSender(), amount, chainId);
return true;
}
event BridgeDeposit(address indexed sender, uint256 indexed amount, uint chainId);
event BridgeWithdrawal(address indexed sender, uint256 indexed amount, uint chainId);
function _addChainId(uint chainId) internal returns (bool) {
chainIds[chainId] = true;
return true;
}
function _removeChainId(uint chainId) internal returns (bool) {
chainIds[chainId] = false;
return true;
}
}
contract VaultHandlerV7a is ReentrancyGuard, Bridged {
using SafeMath for uint256;
using SafeMath for uint8;
address payable private owner;
string public metadataBaseUri;
bool public initialized;
address public nftAddress;
address public recipientAddress;
address public claimAddress;
uint256 public price;
bool public shouldBurn = false;
uint internal blockWindow = 3;
struct PreMint {
string payload;
bytes32 preImage;
}
struct PreTransfer {
string payload;
bytes32 preImage;
address _from;
}
struct Offer {
uint tokenId;
address _from;
}
mapping(address => mapping(uint => PreMint)) preMints;
mapping(address => mapping(uint => PreMint)) preMintsByIndex;
mapping(address => uint) preMintCounts;
mapping(uint => PreTransfer) preTransfers;
mapping(uint => mapping(uint => PreTransfer)) preTransfersByIndex;
mapping(uint => uint) preTransferCounts;
mapping(uint => Offer[]) offers;
mapping(uint => Offer[]) rejected;
mapping(address => mapping(uint => Offer)) offered;
mapping(address => bool) public blacklisted;
mapping(address => bool) public witnesses;
mapping(uint256 => bool) usedNonces;
mapping(uint256 => bool) public usedTokenIds;
// event for EVM logging
event OwnerSet(address indexed oldOwner, address indexed newOwner);
// modifier to check if caller is owner
modifier isOwner() {
// If the first argument of 'require' evaluates to 'false', execution terminates and all
// changes to the state and to Ether balances are reverted.
// This used to consume all gas in old EVM versions, but not anymore.
// It is often a good idea to use 'require' to check if functions are called correctly.
// As a second argument, you can also provide an explanation about what went wrong.
require(msg.sender == owner, "Caller is not owner");
_;
}
// modifier to check if caller blacklisted
modifier notBlacklisted() {
require(!blacklisted[msg.sender], "Caller is blacklisted");
_;
}
/**
* @dev Change owner
* @param newOwner address of new owner
*/
function transferOwnership(address payable newOwner) public isOwner {
emit OwnerSet(owner, newOwner);
owner = newOwner;
}
/**
* @dev Return owner address
* @return address of owner
*/
function getOwner() external view returns (address) {
return owner;
}
constructor(address _nftAddress, address _paymentAddress, address _recipientAddress, uint256 _price) {
owner = _msgSender(); // 'msg.sender' is sender of current call, contract deployer for a constructor
emit OwnerSet(address(0), owner);
addWitness(owner);
metadataBaseUri = "https://api.emblemvault.io/s:evmetadata/meta/";
nftAddress = _nftAddress;
paymentAddress = _paymentAddress;
recipientAddress = _recipientAddress;
initialized = true;
uint decimals = BasicERC20(paymentAddress).decimals();
price = _price * 10 ** decimals;
}
function claim(uint256 tokenId) public isOwner {
bytes32[] memory proof;
IClaimed claimer = IClaimed(claimAddress);
require(!claimer.isClaimed(nftAddress, tokenId, proof), "Already Claimed");
IERC721 token = IERC721(nftAddress);
token.burn(tokenId);
}
function claimOnChain(uint256 tokenId) public nonReentrant notBlacklisted {
bytes32[] memory proof;
IClaimed claimer = IClaimed(claimAddress);
require(!claimer.isClaimed(nftAddress, tokenId, proof), "Already Claimed");
IERC721 token = IERC721(nftAddress);
require(token.ownerOf(tokenId) == _msgSender(), "Not Token Owner");
token.burn(tokenId);
claimer.claim(nftAddress, tokenId, _msgSender());
}
function addClaimAddress(address _address) public isOwner {
claimAddress = _address;
}
function toggleBlacklist(address _address) public isOwner {
blacklisted[_address] = !blacklisted[_address];
}
function adjustBlockWindow(uint size) public isOwner {
blockWindow = size;
}
function buyWithSignature2(address _to, uint256 _tokenId, string calldata _payload, uint256 _nonce, uint signedBlock, bytes calldata _signature) public payable notBlacklisted {
bytes32[] memory proof;
require(signedBlock.add(blockWindow) > block.number, 'Signature expired');
require(!IClaimed(claimAddress).isClaimed(nftAddress, _tokenId, proof) && !usedTokenIds[_tokenId], "Already claimed");
IERC721 nftToken = IERC721(nftAddress);
if (shouldBurn) {
require(IERC20Token(paymentAddress).transferFrom(msg.sender, address(this), price), 'Transfer ERROR'); // Payment sent to recipient
BasicERC20(paymentAddress).burn(price);
} else {
require(IERC20Token(paymentAddress).transferFrom(msg.sender, address(recipientAddress), price), 'Transfer ERROR'); // Payment sent to recipient
}
address signer = getAddressFromSignature(_tokenId, _nonce, _payload, signedBlock, _signature);
require(witnesses[signer], 'Not Witnessed');
usedNonces[_nonce] = true;
string memory _uri = concat(metadataBaseUri, uintToStr(_tokenId));
nftToken.mint(_to, _tokenId, _uri, _payload);
usedTokenIds[_tokenId] = true;
}
function buyWithSignature(address _to, uint256 _tokenId, string calldata _payload, uint256 _nonce, bytes calldata _signature) public isOwner payable {
IERC20Token paymentToken = IERC20Token(paymentAddress);
IERC721 nftToken = IERC721(nftAddress);
if (shouldBurn) {
require(paymentToken.transferFrom(msg.sender, address(this), price), 'Transfer ERROR'); // Payment sent to recipient
BasicERC20(paymentAddress).burn(price);
} else {
require(paymentToken.transferFrom(msg.sender, address(recipientAddress), price), 'Transfer ERROR'); // Payment sent to recipient
}
address signer = getAddressFromSignature(_tokenId, _nonce, _payload, _signature);
require(witnesses[signer], 'Not Witnessed');
usedNonces[_nonce] = true;
string memory _uri = concat(metadataBaseUri, uintToStr(_tokenId));
nftToken.mint(_to, _tokenId, _uri, _payload);
}
function addPreMint(address _for, string calldata _payload, uint256 _tokenId, bytes32 preImage) public isOwner {
try IERC721(nftAddress).tokenPayload(_tokenId) returns (string memory) {
revert('NFT Exists with this ID');
} catch {
require(!_duplicatePremint(_for, _tokenId), 'Duplicate PreMint');
preMintCounts[_for] = preMintCounts[_for].add(1);
preMints[_for][_tokenId] = PreMint(_payload, preImage);
preMintsByIndex[_for][preMintCounts[_for]] = preMints[_for][_tokenId];
}
}
function _duplicatePremint(address _for, uint256 _tokenId) internal view returns (bool) {
string memory data = preMints[_for][_tokenId].payload;
bytes32 NULL = keccak256(bytes(''));
return keccak256(bytes(data)) != NULL;
}
function deletePreMint(address _for, uint256 _tokenId) public isOwner {
delete preMintsByIndex[_for][preMintCounts[_for]];
preMintCounts[_for] = preMintCounts[_for].sub(1);
delete preMints[_for][_tokenId];
}
function getPreMint(address _for, uint256 _tokenId) public view returns (PreMint memory) {
return preMints[_for][_tokenId];
}
function checkPreMintImage(string memory image, bytes32 preImage) public pure returns (bytes32, bytes32, bool) {
bytes32 calculated = sha256(abi.encodePacked(image));
bytes32 preBytes = preImage;
return (calculated, preBytes, calculated == preBytes);
}
function getPreMintCount(address _for) public view returns (uint length) {
return preMintCounts[_for];
}
function getPreMintByIndex(address _for, uint index) public view returns (PreMint memory) {
return preMintsByIndex[_for][index];
}
function toggleShouldBurn() public isOwner {
shouldBurn = !shouldBurn;
}
/* Transfer with code */
function addWitness(address _witness) public isOwner {
witnesses[_witness] = true;
}
function removeWitness(address _witness) public isOwner {
witnesses[_witness] = false;
}
function getAddressFromSignature(uint256 _tokenId, uint256 _nonce, bytes memory signature) public view returns (address) {
require(!usedNonces[_nonce]);
bytes32 hash = keccak256(abi.encodePacked(concat(uintToStr(_tokenId), uintToStr(_nonce))));
address addressFromSig = recoverSigner(hash, signature);
return addressFromSig;
}
function getAddressFromSignature(uint256 _tokenId, uint256 _nonce, string calldata payload, bytes memory signature) public view returns (address) {
require(!usedNonces[_nonce]);
string memory combined = concat(uintToStr(_tokenId), payload);
bytes32 hash = keccak256(abi.encodePacked(concat(combined, uintToStr(_nonce))));
address addressFromSig = recoverSigner(hash, signature);
return addressFromSig;
}
function getAddressFromSignature(uint256 _tokenId, uint256 _nonce, string calldata payload, uint blockNumber, bytes memory signature) public view returns (address) {
require(!usedNonces[_nonce]);
string memory combined = concat(concat(uintToStr(_tokenId), payload), uintToStr(blockNumber));
bytes32 hash = keccak256(abi.encodePacked(concat(combined, uintToStr(_nonce))));
address addressFromSig = recoverSigner(hash, signature);
return addressFromSig;
}
function getAddressFromSignature(bytes32 _hash, bytes calldata signature) public pure returns (address) {
address addressFromSig = recoverSigner(_hash, signature);
return addressFromSig;
}
function getHash(string calldata _payload) public pure returns (bytes32) {
bytes32 hash = keccak256(abi.encodePacked(_payload));
return hash;
}
function transferWithCode(uint256 _tokenId, string calldata code, address _to, uint256 _nonce, bytes memory signature) public payable notBlacklisted {
require(witnesses[getAddressFromSignature(_tokenId, _nonce, signature)], 'Not Witnessed');
IERC721 nftToken = IERC721(nftAddress);
PreTransfer memory preTransfer = preTransfers[_tokenId];
require(preTransfer.preImage == sha256(abi.encodePacked(code)), 'Code does not match'); // Payload should match
nftToken.transferFrom(preTransfer._from, _to, _tokenId);
delete preTransfers[_tokenId];
delete preTransfersByIndex[_tokenId][preTransferCounts[_tokenId]];
preTransferCounts[_tokenId] = preTransferCounts[_tokenId].sub(1);
usedNonces[_nonce] = true;
}
function addPreTransfer(uint256 _tokenId, bytes32 preImage) public {
require(!_duplicatePretransfer(_tokenId), 'Duplicate PreTransfer');
preTransferCounts[_tokenId] = preTransferCounts[_tokenId].add(1);
preTransfers[_tokenId] = PreTransfer("payload", preImage, msg.sender);
preTransfersByIndex[_tokenId][preTransferCounts[_tokenId]] = preTransfers[_tokenId];
}
function _duplicatePretransfer(uint256 _tokenId) internal view returns (bool) {
string memory data = preTransfers[_tokenId].payload;
bytes32 NULL = keccak256(bytes(''));
return keccak256(bytes(data)) != NULL;
}
function deletePreTransfer(uint256 _tokenId) public {
require(preTransfers[_tokenId]._from == msg.sender, 'PreTransfer does not belong to sender');
delete preTransfersByIndex[_tokenId][preTransferCounts[_tokenId]];
preTransferCounts[_tokenId] = preTransferCounts[_tokenId].sub(1);
delete preTransfers[_tokenId];
}
function getPreTransfer(uint256 _tokenId) public view returns (PreTransfer memory) {
return preTransfers[_tokenId];
}
function checkPreTransferImage(string memory image, bytes32 preImage) public pure returns (bytes32, bytes32, bool) {
bytes32 calculated = sha256(abi.encodePacked(image));
bytes32 preBytes = preImage;
return (calculated, preBytes, calculated == preBytes);
}
function getPreTransferCount(uint256 _tokenId) public view returns (uint length) {
return preTransferCounts[_tokenId];
}
function getPreTransferByIndex(uint256 _tokenId, uint index) public view returns (PreTransfer memory) {
return preTransfersByIndex[_tokenId][index];
}
function changeMetadataBaseUri(string calldata _uri) public isOwner {
metadataBaseUri = _uri;
}
function transferPaymentOwnership(address newOwner) external isOwner {
Ownable paymentToken = Ownable(paymentAddress);
paymentToken.transferOwnership(newOwner);
}
function transferNftOwnership(address newOwner) external isOwner {
Ownable nftToken = Ownable(nftAddress);
nftToken.transferOwnership(newOwner);
}
function mint( address _to, uint256 _tokenId, string calldata _uri, string calldata _payload) external isOwner {
IERC721 nftToken = IERC721(nftAddress);
nftToken.mint(_to, _tokenId, _uri, _payload);
}
function changeName(string calldata name, string calldata symbol) external isOwner {
IERC721 nftToken = IERC721(nftAddress);
nftToken.changeName(name, symbol);
}
function updateTokenUri(uint256 _tokenId,string memory _uri) external isOwner {
IERC721 nftToken = IERC721(nftAddress);
nftToken.updateTokenUri(_tokenId, _uri);
}
function getPaymentDecimals() public view returns (uint8){
BasicERC20 token = BasicERC20(paymentAddress);
return token.decimals();
}
function changePayment(address payment) public isOwner {
paymentAddress = payment;
}
// function changeCoupon(address coupon) public isOwner {
// couponAddress = coupon;
// }
function changeRecipient(address _recipient) public isOwner {
recipientAddress = _recipient;
}
function changeNft(address token) public isOwner {
nftAddress = token;
}
function changePrice(uint256 _price) public isOwner {
uint decimals = BasicERC20(paymentAddress).decimals();
price = _price * 10 ** decimals;
}
// function changeOfferPrice(uint256 _price) public isOwner {
// uint decimals = BasicERC20(couponAddress).decimals();
// offerPrice = _price * 10 ** decimals;
// }
function addChainId(uint chainId) public isOwner returns (bool) {
return (_addChainId(chainId));
}
function removeChainId(uint chainId) public isOwner returns (bool) {
return (_removeChainId(chainId));
}
function transferFromChain(address _to, uint chainId, uint256 amount) public isOwner returns (bool) {
return _transferFromChain(_to, chainId, amount);
}
function concat(string memory a, string memory b) internal pure returns (string memory) {
return string(abi.encodePacked(a, b));
}
/**
* @dev Recover signer address from a message by using their signature
* @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
* @param sig bytes signature, the signature is generated using web3.eth.sign(). Inclusive "0x..."
*/
function recoverSigner(bytes32 hash, bytes memory sig) internal pure returns (address) {
require(sig.length == 65, "Require correct length");
bytes32 r;
bytes32 s;
uint8 v;
// Divide the signature in r, s and v variables
assembly {
r := mload(add(sig, 32))
s := mload(add(sig, 64))
v := byte(0, mload(add(sig, 96)))
}
// Version of signature should be 27 or 28, but 0 and 1 are also possible versions
if (v < 27) {
v += 27;
}
require(v == 27 || v == 28, "Signature version not match");
return recoverSigner2(hash, v, r, s);
}
function recoverSigner2(bytes32 h, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
bytes memory prefix = "\x19Ethereum Signed Message:\n32";
bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, h));
address addr = ecrecover(prefixedHash, v, r, s);
return addr;
}
function uintToStr(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
function stringToBytes32(string memory source) internal pure returns (bytes32 result) {
bytes memory tempEmptyStringTest = bytes(source);
if (tempEmptyStringTest.length == 0) {
return 0x0;
}
assembly {
result := mload(add(source, 32))
}
}
function bytes32ToStr(bytes32 _bytes32) internal pure returns (string memory) {
// string memory str = string(_bytes32);
// TypeError: Explicit type conversion not allowed from "bytes32" to "string storage pointer"
// thus we should fist convert bytes32 to bytes (to dynamically-sized byte array)
bytes memory bytesArray = new bytes(32);
for (uint256 i; i < 32; i++) {
bytesArray[i] = _bytes32[i];
}
return string(bytesArray);
}
function asciiToInteger(bytes32 x) public pure returns (uint256) {
uint256 y;
for (uint256 i = 0; i < 32; i++) {
uint256 c = (uint256(x) >> (i * 8)) & 0xff;
if (48 <= c && c <= 57)
y += (c - 48) * 10 ** i;
else
break;
}
return y;
}
function toString(address account) public pure returns(string memory) {
return toString(abi.encodePacked(account));
}
function toString(uint256 value) public pure returns(string memory) {
return toString(abi.encodePacked(value));
}
function toString(bytes32 value) public pure returns(string memory) {
return toString(abi.encodePacked(value));
}
function toString(bytes memory data) public pure returns(string memory) {
bytes memory alphabet = "0123456789abcdef";
bytes memory str = new bytes(2 + data.length * 2);
str[0] = "0";
str[1] = "x";
for (uint i = 0; i < data.length; i++) {
str[2+i*2] = alphabet[uint(uint8(data[i] >> 4))];
str[3+i*2] = alphabet[uint(uint8(data[i] & 0x0f))];
}
return string(str);
}
}