128 lines
4.2 KiB
Solidity
128 lines
4.2 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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pragma experimental ABIEncoderV2;
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import {SafeMath} from "../lib/SafeMath.sol";
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import {Ownable} from "../lib/Ownable.sol";
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/**
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* @title DODOLpToken
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* @author DODO Breeder
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*
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* @notice Tokenize liquidity pool assets. An ordinary ERC20 contract with mint and burn functions
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*/
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contract DODOLpToken is Ownable {
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using SafeMath for uint256;
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string public name;
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uint8 public decimals;
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uint256 public totalSupply;
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mapping(address => uint256) internal balances;
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mapping(address => mapping(address => uint256)) internal allowed;
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// ============ Events ============
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event Transfer(address indexed from, address indexed to, uint256 amount);
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event Approval(address indexed owner, address indexed spender, uint256 amount);
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event Mint(address indexed user, uint256 value);
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event Burn(address indexed user, uint256 value);
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// ============ Functions ============
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constructor(string memory _name, uint8 _decimals) public {
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name = _name;
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decimals = _decimals;
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}
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/**
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* @dev transfer token for a specified address
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* @param to The address to transfer to.
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* @param amount The amount to be transferred.
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*/
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function transfer(address to, uint256 amount) public returns (bool) {
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require(to != address(0), "TO_ADDRESS_IS_EMPTY");
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require(amount <= balances[msg.sender], "BALANCE_NOT_ENOUGH");
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balances[msg.sender] = balances[msg.sender].sub(amount);
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balances[to] = balances[to].add(amount);
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emit Transfer(msg.sender, to, amount);
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return true;
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}
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/**
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* @dev Gets the balance of the specified address.
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* @param owner The address to query the the balance of.
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* @return balance An uint256 representing the amount owned by the passed address.
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*/
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function balanceOf(address owner) external view returns (uint256 balance) {
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return balances[owner];
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}
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/**
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* @dev Transfer tokens from one address to another
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* @param from address The address which you want to send tokens from
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* @param to address The address which you want to transfer to
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* @param amount uint256 the amount of tokens to be transferred
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*/
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) public returns (bool) {
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require(to != address(0), "TO_ADDRESS_IS_EMPTY");
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require(amount <= balances[from], "BALANCE_NOT_ENOUGH");
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require(amount <= allowed[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
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balances[from] = balances[from].sub(amount);
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balances[to] = balances[to].add(amount);
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allowed[from][msg.sender] = allowed[from][msg.sender].sub(amount);
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emit Transfer(from, to, amount);
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return true;
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}
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/**
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* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
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* @param spender The address which will spend the funds.
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* @param amount The amount of tokens to be spent.
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*/
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function approve(address spender, uint256 amount) public returns (bool) {
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allowed[msg.sender][spender] = amount;
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emit Approval(msg.sender, spender, amount);
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return true;
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}
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/**
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* @dev Function to check the amount of tokens that an owner allowed to a spender.
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* @param owner address The address which owns the funds.
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* @param spender address The address which will spend the funds.
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* @return A uint256 specifying the amount of tokens still available for the spender.
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*/
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function allowance(address owner, address spender) public view returns (uint256) {
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return allowed[owner][spender];
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}
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function mint(address user, uint256 value) external onlyOwner {
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balances[user] = balances[user].add(value);
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totalSupply = totalSupply.add(value);
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emit Mint(address(0), value);
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emit Transfer(address(0), user, value);
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}
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function burn(address user, uint256 value) external onlyOwner {
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balances[user] = balances[user].sub(value);
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totalSupply = totalSupply.sub(value);
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emit Burn(user, value);
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emit Transfer(user, address(0), value);
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}
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}
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