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9-ERC1155.sol
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9-ERC1155.sol
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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
// - create a ERC1155 token standard , that enable batch mint and batch transfer
// - Multi token standard for NFT and tokens
// - Openzepplin library can be used
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.0.0/contracts/token/ERC1155/ERC1155.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.0.0/contracts/access/Ownable.sol";
contract MyNFT is ERC1155, Ownable {
// _paused is used to pause the contract in case of an emergency
bool public _paused;
// baseUri for the nft metadata
string _baseTokenURI ;
// rate and supply
uint256 rate = 0.01 ether;
uint256 supply = 10000;
uint256 minted = 0;
/// pause modifier to check if the contract is not paused
modifier onlyWhenNotPaused() {
require(!_paused, "Contract currently paused");
_;
}
//base uri is the location where you nft data is stored using json format , be it is IPFS too
constructor(string memory baseURI) ERC1155(baseURI) {
_baseTokenURI = baseURI;
}
/// using payable to make the function payable while minting
function mint() public payable {
require(minted+1<=supply,"Exceeded maximum CricDAO NFT supply");
require(msg.value >= rate,"Not Enough Ether");
_mint(msg.sender, 1, 1, "");
minted += 1 ;
}
/**
* @dev setPaused makes the contract paused or unpaused
* it is helpful when launching a main chain project to stop the minting in case of any issue.
*/
function setPaused(bool val) public onlyOwner {
_paused = val;
}
/**
* @dev withdraw sends all the ether in the contract
* to the owner of the contract
*/
function withdraw() public onlyOwner {
address _owner = owner();
uint256 amount = address(this).balance;
(bool sent, ) = _owner.call{value: amount}("");
require(sent, "Failed to send Ether");
}
// Function to receive Ether. msg.data must be empty
receive() external payable {}
// Fallback function is called when msg.data is not empty
fallback() external payable {}
}