Contract Name:
DODOLpToken
Contract Source Code:
File 1 of 1 : DODOLpToken
// File: contracts/intf/IERC20.sol
/*
Copyright 2020 DODO ZOO.
SPDX-License-Identifier: Apache-2.0
*/
pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
function decimals() external view returns (uint8);
function name() external view returns (string memory);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
}
// File: contracts/lib/SafeMath.sol
/*
Copyright 2020 DODO ZOO.
*/
/**
* @title SafeMath
* @author DODO Breeder
*
* @notice Math operations with safety checks that revert on error
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "MUL_ERROR");
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0, "DIVIDING_ERROR");
return a / b;
}
function divCeil(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 quotient = div(a, b);
uint256 remainder = a - quotient * b;
if (remainder > 0) {
return quotient + 1;
} else {
return quotient;
}
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a, "SUB_ERROR");
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "ADD_ERROR");
return c;
}
function sqrt(uint256 x) internal pure returns (uint256 y) {
uint256 z = x / 2 + 1;
y = x;
while (z < y) {
y = z;
z = (x / z + z) / 2;
}
}
}
// File: contracts/lib/Ownable.sol
/*
Copyright 2020 DODO ZOO.
*/
/**
* @title Ownable
* @author DODO Breeder
*
* @notice Ownership related functions
*/
contract Ownable {
address public _OWNER_;
address public _NEW_OWNER_;
// ============ Events ============
event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner);
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
// ============ Modifiers ============
modifier onlyOwner() {
require(msg.sender == _OWNER_, "NOT_OWNER");
_;
}
// ============ Functions ============
constructor() internal {
_OWNER_ = msg.sender;
emit OwnershipTransferred(address(0), _OWNER_);
}
function transferOwnership(address newOwner) external onlyOwner {
require(newOwner != address(0), "INVALID_OWNER");
emit OwnershipTransferPrepared(_OWNER_, newOwner);
_NEW_OWNER_ = newOwner;
}
function claimOwnership() external {
require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
_OWNER_ = _NEW_OWNER_;
_NEW_OWNER_ = address(0);
}
}
// File: contracts/impl/DODOLpToken.sol
/*
Copyright 2020 DODO ZOO.
*/
/**
* @title DODOLpToken
* @author DODO Breeder
*
* @notice Tokenize liquidity pool assets. An ordinary ERC20 contract with mint and burn functions
*/
contract DODOLpToken is Ownable {
using SafeMath for uint256;
string public symbol = "DLP";
address public originToken;
uint256 public totalSupply;
mapping(address => uint256) internal balances;
mapping(address => mapping(address => uint256)) internal allowed;
// ============ Events ============
event Transfer(address indexed from, address indexed to, uint256 amount);
event Approval(address indexed owner, address indexed spender, uint256 amount);
event Mint(address indexed user, uint256 value);
event Burn(address indexed user, uint256 value);
// ============ Functions ============
constructor(address _originToken) public {
originToken = _originToken;
}
function name() public view returns (string memory) {
string memory lpTokenSuffix = "_DODO_LP_TOKEN_";
return string(abi.encodePacked(IERC20(originToken).name(), lpTokenSuffix));
}
function decimals() public view returns (uint8) {
return IERC20(originToken).decimals();
}
/**
* @dev transfer token for a specified address
* @param to The address to transfer to.
* @param amount The amount to be transferred.
*/
function transfer(address to, uint256 amount) public returns (bool) {
require(amount <= balances[msg.sender], "BALANCE_NOT_ENOUGH");
balances[msg.sender] = balances[msg.sender].sub(amount);
balances[to] = balances[to].add(amount);
emit Transfer(msg.sender, to, amount);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the the balance of.
* @return balance An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address owner) external view returns (uint256 balance) {
return balances[owner];
}
/**
* @dev Transfer tokens from one address to another
* @param from address The address which you want to send tokens from
* @param to address The address which you want to transfer to
* @param amount uint256 the amount of tokens to be transferred
*/
function transferFrom(
address from,
address to,
uint256 amount
) public returns (bool) {
require(amount <= balances[from], "BALANCE_NOT_ENOUGH");
require(amount <= allowed[from][msg.sender], "ALLOWANCE_NOT_ENOUGH");
balances[from] = balances[from].sub(amount);
balances[to] = balances[to].add(amount);
allowed[from][msg.sender] = allowed[from][msg.sender].sub(amount);
emit Transfer(from, to, amount);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* @param spender The address which will spend the funds.
* @param amount The amount of tokens to be spent.
*/
function approve(address spender, uint256 amount) public returns (bool) {
allowed[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param owner address The address which owns the funds.
* @param spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return allowed[owner][spender];
}
function mint(address user, uint256 value) external onlyOwner {
balances[user] = balances[user].add(value);
totalSupply = totalSupply.add(value);
emit Mint(user, value);
emit Transfer(address(0), user, value);
}
function burn(address user, uint256 value) external onlyOwner {
balances[user] = balances[user].sub(value);
totalSupply = totalSupply.sub(value);
emit Burn(user, value);
emit Transfer(user, address(0), value);
}
}