DEFI|swap薄饼LP流动性锁定指定代币合约开发部署

SWAP薄饼（Pancakeswap）是一种去中心化交易平台，它允许用户在不需要信任任何中心化交易平台的情况下进行代币交换。其中，LP流动性是指用户在SWAP薄饼平台上提供的流动性，通过锁定指定的代币，以提供交易对手方的交易需求。

在SWAP薄饼中，添加流动性后实现永久锁仓的目的是为了彻底放弃对资金池的控制权限，永久不能撤池。这样可以对外公开展示永久放弃对流动性的控制权限，降低合约的交易风险，提高合约评级。同时，永久锁仓也可以降低项目方可以随时撤池的风险，确保LP的权益得到保障。

需要注意的是，只有当项目方在首次完成流动性的添加后，才会进行永久锁仓。后续用户添加的流动性不受锁仓影响，可以随意撤池。此外，SWAP薄饼也提供流动性添加和撤池的API接口，以方便开发者和机构进行自动化操作。

以下是一个简单的SWAP薄饼LP流动性的智能合约代码示例，供参考：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/ERC20/ERC20.sol";
import "@openzeppelin/contracts/utils/ERC721/ERC721.sol";

contract PancakeswapLP is ERC20, ERC721 {
using SafeMath for uint256;
using Oraclize for address;

// LP token address  
address public tokenAddress;  

// LP token symbol  
string public tokenSymbol;  

// LP token decimals  
uint8 public tokenDecimals;  

// LP token contract  
ERC20 public tokenContract;  

// Token mapping for price oracles  
mapping (address => mapping (address => uint256)) private tokenBalances;  

// LP token decimals mapping for price oracles  
mapping (address => mapping (uint256 => uint8)) private decimalsBalances;  

// LP token locked mapping for price oracles  
mapping (address => mapping (uint256 => bool)) private lockedBalances;  

// Oracle event mapping for price oracles  
event logTokenLocked(address, uint256, bool);  
event logTokenUnlocked(address, uint256, bool);  

constructor(address _tokenAddress, string memory _tokenSymbol, uint8 _tokenDecimals) ERC20_constructor(_tokenAddress, _tokenSymbol, _tokenDecimals) {  
    tokenAddress = _tokenAddress;  
    tokenSymbol = _tokenSymbol;  
    tokenDecimals = _tokenDecimals;  
    tokenContract = ERC20(tokenAddress);  
}  

function addLiquidity(address _tokenToSwap, uint256 _amountToSwap, address _priceOracle, bytes32 _oracleSignature) public returns (uint256) {  
    require(_amountToSwap > 0);  
    require(_priceOracle != address(0));  
    require(_oracleSignature != 0);  
    require(!lockedBalances[_priceOracle][_amountToSwap]);  
    require(tokenBalances[msg.sender][_amountToSwap] == 0);  
    uint256 tokenValue = _amountToSwap * 10 ** tokenDecimals;  
    uint256 valueToSwap = tokenValue / 10 ** ERC20.decimals();  
    uint256 lockedAmount = valueToSwap / 10 ** 18; // Locked amount is in ETH units, so divide by 10^18 to convert to Wei.  
    uint256 remainingAmount = valueToSwap % 10 ** 18; // Remaining amount is in Wei units.  
    require(Oraclize_getPrice("URL", string(abi.encodePacked("eth", _oracleSignature))) >= valueToSwap);  
    require(Oraclize_getPrice("URL", string(abi.encodePacked("eth", _oracleSignature))) >= remainingAmount);  
    uint256 remainingTokenValue = tokenValue % 10 ** ERC20.decimals(); // Remaining token amount is in the native token decimals.  
    tokenBalances[msg.sender][_amountToSwap] = _amountToSwap; // Update token balance mapping.  
    decimalsBalances[msg.sender][_amountToSwap] = tokenDecimals; // Update decimals balance mapping.  
    lockedBalances[_priceOracle][_amountToSwap] = true; // Lock the LP token for the specified Oracle and amount.  
    uint256 burnedValue = valueToSwap / 10 ** 18 * 10 ** ERC20.decimals(); // Convert Wei to native token units.  
    uint256 remainingTokenValueInWei = burnedValue * 10 ** ERC20.decimals(); // Convert burned value to Wei units.  
    tokenContract.burn(burner(msg.sender), remainingTokenValueInWei); // Burn the remaining token amount.  
    emit TokenLocked(msg.sender, _amountToSwap, true); // Log the Oracle event for locked tokens.  
    return burnedValue; // Return the burned value in native token units.  
}  

function unlockToken(address _priceOracle, uint256 _amountToUnlock) public returns (uint256) {