My Problem is solved thanks moralis 
Are you there? Can you please check this for me, i tried to catch error before user connect their wallet and it works successful but my signing message won’t show when user clicked on connect wallet and also when user click on connect wallet connect button, it will not connect, what am i doing wrong? please check my code below. Thanks
const serverUrl = "https://mzrhanzmogsu.moralishost.com:2053/server";
const appId = "gFnTLmvgt8ZDUYMXF80FIonsCRqosKxXcfzmO2bM";
Moralis.start({ serverUrl, appId });
async function hide_buttons() {
let user = await Moralis.User.current();
if (!user) {
document.getElementById("btnConnect").style.display = "block";
document.getElementById("btnUserInfo").style.display = "none";
document.getElementById("btnLogout").style.display = "none";
document.getElementById("userInfo").style.display = "none";
} else {
document.getElementById("btnUserInfo").style.display = "block";
document.getElementById("btnConnect").style.display = "none";
document.getElementById("btnLogout").style.display = "block";
}
}
hide_buttons();
async function login() {
let user = Moralis.User.current();
if (!user) {
user = await Moralis.authenticate({
signingMessage: "Welcome to GrandPaDoge NFT MarketPlace",
});
}
console.log("logged in user:", user);
hide_buttons();
const isWeb3Active = Moralis.ensureWeb3IsInstalled();
if (isWeb3Active) {
console.log("Activated");
} else {
async function enable() {
await Moralis.enable();
}
}
}
async function logOut() {
await Moralis.User.logOut();
console.log("logged out");
hide_buttons();
}
async function login() {
try {
await Moralis.authenticate();
} catch (error) {
alert((error = "please install metamask before connecting"));
}
}
async function openuserInfo() {
user = await Moralis.User.current();
hide_buttons();
if (user) {
document.getElementById("userInfo").style.display = "block";
} else {
login();
}
}
async function closeuserInfo() {
user = await Moralis.User.current();
hide_buttons();
if (user) {
document.getElementById("userInfo").style.display = "none";
} else {
logOut();
}
}
document.getElementById("btnConnect").onclick = login;
document.getElementById("btnLogout").onclick = logOut;
document.getElementById("btnUserInfo").onclick = openuserInfo;
document.getElementById("btnCloseUserInfo").onclick = closeuserInfo;
Are you there? Can you please check this for me, i tried to catch error before user connect their wallet and it works successful but my signing message won’t show when user clicked on connect wallet and also when user click on connect wallet connect button, it will not connect, what am i doing wrong? please check my code below.
const serverUrl = "https://mzrhanzmogsu.moralishost.com:2053/server";
const appId = "gFnTLmvgt8ZDUYMXF80FIonsCRqosKxXcfzmO2bM";
Moralis.start({ serverUrl, appId });
async function hide_buttons() {
let user = await Moralis.User.current();
if (!user) {
document.getElementById("btnConnect").style.display = "block";
document.getElementById("btnUserInfo").style.display = "none";
document.getElementById("btnLogout").style.display = "none";
document.getElementById("userInfo").style.display = "none";
} else {
document.getElementById("btnUserInfo").style.display = "block";
document.getElementById("btnConnect").style.display = "none";
document.getElementById("btnLogout").style.display = "block";
}
}
hide_buttons();
async function login() {
let user = Moralis.User.current();
if (!user) {
user = await Moralis.authenticate({
signingMessage: "Welcome to GrandPaDoge NFT MarketPlace",
});
}
console.log("logged in user:", user);
hide_buttons();
const isWeb3Active = Moralis.ensureWeb3IsInstalled();
if (isWeb3Active) {
console.log("Activated");
} else {
async function enable() {
await Moralis.enable();
}
}
}
async function logOut() {
await Moralis.User.logOut();
console.log("logged out");
hide_buttons();
}
async function login() {
try {
await Moralis.authenticate();
} catch (error) {
alert((error = "please install metamask before connecting"));
}
}
async function openuserInfo() {
user = await Moralis.User.current();
hide_buttons();
if (user) {
document.getElementById("userInfo").style.display = "block";
} else {
login();
}
}
async function closeuserInfo() {
user = await Moralis.User.current();
hide_buttons();
if (user) {
document.getElementById("userInfo").style.display = "none";
} else {
logOut();
}
}
document.getElementById("btnConnect").onclick = login;
document.getElementById("btnLogout").onclick = logOut;
document.getElementById("btnUserInfo").onclick = openuserInfo;
document.getElementById("btnCloseUserInfo").onclick = closeuserInfo;
Why do you have 2 login functions?
Change to this
async function login() {
let user = Moralis.User.current();
if (!user) {
try {
user = await Moralis.authenticate({
signingMessage: "Welcome to GrandPaDoge NFT MarketPlace",
});
} catch (error) {
alert(error)
}
}
console.log("logged in user:", user);
hide_buttons();
const isWeb3Active = Moralis.ensureWeb3IsInstalled();
if (isWeb3Active) {
console.log("Activated");
} else {
async function enable() {
await Moralis.enable();
}
}
}
1 Like
Okay i will look into that
It works thanks. I have another thing to ask, how do i integrate a contract to make an auto distribution when holders bought from the presale link. I mean when user buy token, using the presale link, i want them to get their token automatically distributed to their wallet. Please help if you know about it Thanks.
Like when people send bnb the presale address, i want them to receive the token they want to buy automatically into their wallet address
You would need to code a presale smart contract with function such as:
buyToken() <- user sends BNB to get an allocation
claim() <- user can claim his allocation on launch
Then you will need to make use of Moralis.executeFunction() on the client side.
for example: When button gets clicked Moralis.executeFunction(option) runs which will run the claim() function in the smart contract
Learn more about here:
Execute Function with Moralis
2 Likes
I already using the ethereum SDK for the presale smart contract i have the source code below.
Please check this code. the function should be there
// SPDX-License-Identifier: GPL-3.0-or-later Or MIT
pragma solidity ^0.6.0;
library SafeMath {
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, 'SafeMath: addition overflow');
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, 'SafeMath: subtraction overflow');
}
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
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;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, 'SafeMath: division by zero');
}
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
return c;
}
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, 'SafeMath: modulo by zero');
}
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
interface IBEP20 {
function balanceOf(address account) external view returns (uint256);
function allowance(address _owner, address spender) external view returns (uint256);
function transfer(address recipient, uint256 amount) external returns (bool);
function transferFrom(
address from,
address to,
uint256 value
) external returns (bool ok);
function approve(address spender, uint256 amount) external returns (bool);
}
interface IUniswapV2Factory {
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
function feeTo() external view returns (address);
function feeToSetter() external view returns (address);
function getPair(address tokenA, address tokenB) external view returns (address pair);
function allPairs(uint) external view returns (address pair);
function allPairsLength() external view returns (uint);
function createPair(address tokenA, address tokenB) external returns (address pair);
function setFeeTo(address) external;
function setFeeToSetter(address) external;
}
interface IUniswapV2Pair {
event Approval(address indexed owner, address indexed spender, uint value);
event Transfer(address indexed from, address indexed to, uint value);
function name() external pure returns (string memory);
function symbol() external pure returns (string memory);
function decimals() external pure returns (uint8);
function totalSupply() external view returns (uint);
function balanceOf(address owner) external view returns (uint);
function allowance(address owner, address spender) external view returns (uint);
function approve(address spender, uint value) external returns (bool);
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function DOMAIN_SEPARATOR() external view returns (bytes32);
function PERMIT_TYPEHASH() external pure returns (bytes32);
function nonces(address owner) external view returns (uint);
function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
event Sync(uint112 reserve0, uint112 reserve1);
function MINIMUM_LIQUIDITY() external pure returns (uint);
function factory() external view returns (address);
function token0() external view returns (address);
function token1() external view returns (address);
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
function price0CumulativeLast() external view returns (uint);
function price1CumulativeLast() external view returns (uint);
function kLast() external view returns (uint);
function mint(address to) external returns (uint liquidity);
function burn(address to) external returns (uint amount0, uint amount1);
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
function skim(address to) external;
function sync() external;
function initialize(address, address) external;
}
interface IUniswapV2Router01 {
function factory() external pure returns (address);
function WETH() external pure returns (address);
function addLiquidity(
address tokenA,
address tokenB,
uint amountADesired,
uint amountBDesired,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB, uint liquidity);
function addLiquidityETH(
address token,
uint amountTokenDesired,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external payable returns (uint amountToken, uint amountETH, uint liquidity);
function removeLiquidity(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline
) external returns (uint amountA, uint amountB);
function removeLiquidityETH(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountToken, uint amountETH);
function removeLiquidityWithPermit(
address tokenA,
address tokenB,
uint liquidity,
uint amountAMin,
uint amountBMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountA, uint amountB);
function removeLiquidityETHWithPermit(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountToken, uint amountETH);
function swapExactTokensForTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapTokensForExactTokens(
uint amountOut,
uint amountInMax,
address[] calldata path,
address to,
uint deadline
) external returns (uint[] memory amounts);
function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
external
returns (uint[] memory amounts);
function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
external
payable
returns (uint[] memory amounts);
function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}
interface IUniswapV2Router02 is IUniswapV2Router01 {
function removeLiquidityETHSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline
) external returns (uint amountETH);
function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
address token,
uint liquidity,
uint amountTokenMin,
uint amountETHMin,
address to,
uint deadline,
bool approveMax, uint8 v, bytes32 r, bytes32 s
) external returns (uint amountETH);
function swapExactTokensForTokensSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
function swapExactETHForTokensSupportingFeeOnTransferTokens(
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external payable;
function swapExactTokensForETHSupportingFeeOnTransferTokens(
uint amountIn,
uint amountOutMin,
address[] calldata path,
address to,
uint deadline
) external;
}
contract PXSPresale {
using SafeMath for uint256;
IBEP20 public PXS;
address payable public owner;
uint256 public totalTokensToSell = 81000000000 * 10**18; // 81000000000 PXS tokens for sell
uint256 public PXSPerBnb = 30000000 * 10**18; // 1 BNB = 30000000 PXS
uint256 public minPerTransaction = 3000000 * 10**18; // min amount per transaction (0.1BNB)
uint256 public maxPerUser = 150000000 * 10**18; // max amount per user (5BNB)
uint256 public totalSold;
IUniswapV2Router02 public uniswapV2Router;
address public uniswapV2Pair;
bool public saleEnded;
mapping(address => uint256) public PXSPerAddresses;
event tokensBought(address indexed user, uint256 amountSpent, uint256 amountBought, string tokenName, uint256 date);
event tokensClaimed(address indexed user, uint256 amount, uint256 date);
event addLiquidityEvent(uint256 tokenAmount, uint256 ethAmount, uint256 allowance);
modifier checkSaleRequirements(uint256 buyAmount) {
require(saleEnded == false, 'Sale ended');
require(
buyAmount > 0 && buyAmount <= unsoldTokens(),
'Insufficient buy amount'
);
_;
}
modifier checkWithdrawLPRequirements() {
require(saleEnded == true, 'Sale not finished.');
_;
}
constructor(
address _PXS
) public {
owner = msg.sender;
PXS = IBEP20(_PXS);
}
function buyWithBNB(uint256 buyAmount) public payable checkSaleRequirements(buyAmount) {
uint256 amount = calculateBNBAmount(buyAmount);
require(msg.value >= amount, 'Insufficient BNB balance');
require(buyAmount >= minPerTransaction, 'Lower than the minimal transaction amount');
uint256 sumSoFar = PXSPerAddresses[msg.sender].add(buyAmount);
require(sumSoFar <= maxPerUser, 'Greater than the maximum purchase limit');
PXSPerAddresses[msg.sender] = sumSoFar;
totalSold = totalSold.add(buyAmount);
PXS.transfer(msg.sender, buyAmount);
emit tokensBought(msg.sender, amount, buyAmount, 'BNB', now);
}
function changeOwner(address payable _owner) public {
require(msg.sender == owner);
owner = _owner;
}
function setTotalTokensToSell(uint256 _totalTokensToSell) public {
require(msg.sender == owner);
totalTokensToSell = _totalTokensToSell;
}
function setMinPerTransaction(uint256 _minPerTransaction) public {
require(msg.sender == owner);
minPerTransaction = _minPerTransaction;
}
function setMaxPerUser(uint256 _maxPerUser) public {
require(msg.sender == owner);
maxPerUser = _maxPerUser;
}
function setTokenPricePerBNB(uint256 _PXSPerBnb) public {
require(msg.sender == owner);
require(_PXSPerBnb > 0, "Invalid PXS price per BNB");
PXSPerBnb = _PXSPerBnb;
}
function endSale() public {
require(msg.sender == owner && saleEnded == false);
saleEnded = true;
uint256 bnbAmount = address(this).balance.mul(90).div(100);
uint256 tokenAmount = PXS.balanceOf(address(this));
addLiquidity(tokenAmount, bnbAmount);
}
function withdrawCollectedTokens() public {
require(msg.sender == owner);
require(address(this).balance > 0, "Insufficient balance");
owner.transfer(address(this).balance);
}
function withdrawUnsoldTokens() public {
require(msg.sender == owner);
uint256 remainedTokens = unsoldTokens();
require(remainedTokens > 0, "No remained tokens");
PXS.transfer(owner, remainedTokens);
}
function withdrawLockedLPTokens() public checkWithdrawLPRequirements(){
require(msg.sender == owner);
uint256 lockedLPTokens = lockedLPTokens();
require(lockedLPTokens > 0, "No locked LP tokens");
IUniswapV2Pair(uniswapV2Pair).transfer(owner, lockedLPTokens);
}
function unsoldTokens() public view returns (uint256) {
// return totalTokensToSell.sub(totalSold);
return PXS.balanceOf(address(this));
}
function lockedLPTokens() public view returns (uint256) {
// return totalTokensToSell.sub(totalSold);
return IUniswapV2Pair(uniswapV2Pair).balanceOf(address(this));
}
function calculatePXSAmount(uint256 bnbAmount) public view returns (uint256) {
uint256 PXSAmount = PXSPerBnb.mul(bnbAmount).div(10**18);
return PXSAmount;
}
function calculateBNBAmount(uint256 PXSAmount) public view returns (uint256) {
require(PXSPerBnb > 0, "PXS price per BNB should be greater than 0");
uint256 bnbAmount = PXSAmount.mul(10**18).div(PXSPerBnb);
return bnbAmount;
}
function setRouter(address _router) public {
require(msg.sender == owner && saleEnded == false);
IUniswapV2Router02 _newPancakeRouter = IUniswapV2Router02(_router);
if (IUniswapV2Factory(_newPancakeRouter.factory()).getPair(address(PXS), _newPancakeRouter.WETH()) == address(0)) {
uniswapV2Pair = IUniswapV2Factory(_newPancakeRouter.factory()).createPair(address(PXS), _newPancakeRouter.WETH());
} else {
uniswapV2Pair = IUniswapV2Factory(_newPancakeRouter.factory()).getPair(address(PXS), _newPancakeRouter.WETH());
}
uniswapV2Router = _newPancakeRouter;
}
function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
// approve token transfer to cover all possible scenarios
PXS.approve(address(uniswapV2Router), tokenAmount);
uint256 allowance = PXS.allowance(address(this), address(uniswapV2Router));
emit addLiquidityEvent(tokenAmount, ethAmount, allowance);
// add the liquidity
uniswapV2Router.addLiquidityETH{value: ethAmount}(
address(PXS),
tokenAmount,
0, // slippage is unavoidable
0, // slippage is unavoidable
address(this),
block.timestamp
);
}
}
Are you there bro ? reply back if you are online
This would be aquivalent to my above mentioned buyToken function.
You should audit the code first before using/deploying it
yeah definitely i will tell him to audit it, a friend of mine got that code
So i want to ask, is it possible to create a presale smart contract for an NFT token?
What about the claim token function?
Alright thanks i will do that and check it out
Looks like the buyWithBNB function returns the tokens immediately
1 Like
What if i don’t want to use moralis for building a presale smart contract for a token how do i do that? Because i want to learn how to build a presale smart contract for any token out there in crypto space
I told my friend that the fucntion on the buyBNB gives out the token immediately into his wallet but he said the owner wallet token is not reducing, what is happening to his code or is it just a normal way for owner wallet not deducted or reduced when holders buys the presale.