Contract Source Code:
File 1 of 1 : WADCoin
pragma solidity ^0.4.24;
// import 'openzeppelin-solidity/contracts/math/SafeMath.sol';
// pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, throws on overflow.
*/
function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (_a == 0) {
return 0;
}
c = _a * _b;
assert(c / _a == _b);
return c;
}
/**
* @dev Integer division of two numbers, truncating the quotient.
*/
function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
// assert(_b > 0); // Solidity automatically throws when dividing by 0
// uint256 c = _a / _b;
// assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
return _a / _b;
}
/**
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
assert(_b <= _a);
return _a - _b;
}
/**
* @dev Adds two numbers, throws on overflow.
*/
function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
c = _a + _b;
assert(c >= _a);
return c;
}
}
contract Owned {
address public owner;
function Owned() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) onlyOwner public {
owner = newOwner;
}
}
contract MigrationAgent {
function migrateFrom(address _from, uint256 _value);
}
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }
contract TokenERC20 {
// Public variables of the token
string public name;
string public symbol;
// uint8 public decimals = 18;
uint8 public decimals = 4;
// 18 decimals is the strongly suggested default, avoid changing it
uint256 public totalSupply;
// This creates an array with all balances
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
// This generates a public event on the blockchain that will notify clients
event Transfer(address indexed from, address indexed to, uint256 value);
// This notifies clients about the amount burnt
event Burn(address indexed from, uint256 value);
/**
* Constrctor function
*
* Initializes contract with initial supply tokens to the creator of the contract
*/
function TokenERC20(uint256 initialSupply) public {
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
name = "WADCoin"; // Set the name for display purposes
symbol = "wad"; // Set the symbol for display purposes
}
/**
* Transfer tokens from other address
*
* Send `_value` tokens to `_to` in behalf of `_from`
*
* @param _from The address of the sender
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(_value <= allowance[_from][msg.sender]); // Check allowance
allowance[_from][msg.sender] -= _value;
//_transfer(_from, _to, _value);
return true;
}
/**
* Set allowance for other address
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
*/
function approve(address _spender, uint256 _value) public
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}
/**
* Set allowance for other address and notify
*
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it
*
* @param _spender The address authorized to spend
* @param _value the max amount they can spend
* @param _extraData some extra information to send to the approved contract
*/
function approveAndCall(address _spender, uint256 _value, bytes _extraData)
public
returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
/**
* Destroy tokens
*
* Remove `_value` tokens from the system irreversibly
*
* @param _value the amount of money to burn
*/
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough
balanceOf[msg.sender] -= _value; // Subtract from the sender
totalSupply -= _value; // Updates totalSupply
emit Burn(msg.sender, _value);
return true;
}
/**
* Destroy tokens from other account
*
* Remove `_value` tokens from the system irreversibly on behalf of `_from`.
*
* @param _from the address of the sender
* @param _value the amount of money to burn
*/
function burnFrom(address _from, uint256 _value) public returns (bool success) {
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough
require(_value <= allowance[_from][msg.sender]); // Check allowance
balanceOf[_from] -= _value; // Subtract from the targeted balance
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance
totalSupply -= _value; // Update totalSupply
emit Burn(_from, _value);
return true;
}
}
/******************************************/
/* WADTOKEN STARTS HERE */
/******************************************/
contract WADCoin is Owned, TokenERC20 {
using SafeMath for uint256;
uint256 public sellPrice;
uint256 public buyPrice;
address public migrationAgent;
uint256 public totalMigrated;
address public migrationMaster;
mapping(address => bytes32[]) public lockReason;
mapping(address => mapping(bytes32 => lockToken)) public locked;
struct lockToken {
uint256 amount;
uint256 validity;
}
// event Lock(
// address indexed _of,
// bytes32 indexed _reason,
// uint256 _amount,
// uint256 _validity
// );
/* This generates a public event on the blockchain that will notify clients */
event Migrate(address indexed _from, address indexed _to, uint256 _value);
/* Initializes contract with initial supply tokens to the creator of the contract */
// function MyAdvancedToken(
function WADCoin( uint256 _initialSupply) TokenERC20(_initialSupply) public {
// initialSupply = _initialSupply;
// tokenName = _tokenName;
// tokenSymbol = _tokenSymbol;
}
/// @notice Create `mintedAmount` tokens and send it to `target`
/// @param target Address to receive the tokens
/// @param mintedAmount the amount of tokens it will receive
function mintToken(address target, uint256 mintedAmount) onlyOwner public {
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
emit Transfer(0, this, mintedAmount);
emit Transfer(this, target, mintedAmount);
}
/// @notice Allow users to buy tokens for `newBuyPrice` eth and sell tokens for `newSellPrice` eth
/// @param newSellPrice Price the users can sell to the contract
/// @param newBuyPrice Price users can buy from the contract
function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner public {
sellPrice = newSellPrice;
buyPrice = newBuyPrice;
}
/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint _value) internal {
// Prevent transfer to 0x0 address. Use burn() instead
require(_to != 0x0);
// Check if the sender has enough
require(transferableBalanceOf(_from) >= _value);
// Check for overflows
require(balanceOf[_to] + _value > balanceOf[_to]);
// Save this for an assertion in the future
uint previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
/**
* Transfer tokens
*
* Send `_value` tokens to `_to` from your account
*
* @param _to The address of the recipient
* @param _value the amount to send
*/
function transfer(address _to, uint256 _value) public {
_transfer(msg.sender, _to, _value);
}
/**
* @dev Locks a specified amount of tokens against an address,
* for a specified reason and time
*/
function lock(address _of, bytes32 _reason, uint256 _amount, uint256 _time)
onlyOwner
public
returns (bool)
{
uint256 validUntil = block.timestamp.add(_time);
// If tokens are already locked, the functions extendLock or
// increaseLockAmount should be used to make any changes
//require(tokensLocked(_of, _reason, block.timestamp) == 0);
require(_amount <= transferableBalanceOf(_of));
if (locked[_of][_reason].amount == 0)
lockReason[_of].push(_reason);
if(tokensLocked(_of, _reason, block.timestamp) == 0){
locked[_of][_reason] = lockToken(_amount, validUntil);
}else{
locked[_of][_reason].amount += _amount;
}
//emit Lock(_of, _reason, _amount, validUntil);
return true;
}
/**
* @dev Extends lock for a specified reason and time
* @param _reason The reason to lock tokens
* @param _time Lock extension time in seconds
*/
function extendLock(bytes32 _reason, uint256 _time)
public
returns (bool)
{
require(tokensLocked(msg.sender, _reason, block.timestamp) > 0);
locked[msg.sender][_reason].validity += _time;
// emit Lock(msg.sender, _reason, locked[msg.sender][_reason].amount, locked[msg.sender][_reason].validity);
return true;
}
/**
* @dev Returns tokens locked for a specified address for a
* specified reason at a specified time
*
* @param _of The address whose tokens are locked
* @param _reason The reason to query the lock tokens for
* @param _time The timestamp to query the lock tokens for
*/
function tokensLocked(address _of, bytes32 _reason, uint256 _time)
public
view
returns (uint256 amount)
{
if (locked[_of][_reason].validity > _time)
amount = locked[_of][_reason].amount;
}
function transferableBalanceOf(address _of)
public
view
returns (uint256 amount)
{
uint256 lockedAmount = 0;
for (uint256 i=0; i < lockReason[_of].length; i++) {
lockedAmount += tokensLocked(_of,lockReason[_of][i], block.timestamp);
}
// amount = balances[_of].sub(lockedAmount);
amount = balanceOf[_of].sub(lockedAmount);
return amount;
}
/// @notice Set address of migration target contract and enable migration
/// process.
/// @dev Required state: Operational Normal
/// @dev State transition: -> Operational Migration
/// @param _agent The address of the MigrationAgent contract
function setMigrationAgent(address _agent) external {
// Abort if not in Operational Normal state.
if (migrationAgent != 0) throw;
if (msg.sender != migrationMaster) throw;
migrationAgent = _agent;
}
function setMigrationMaster(address _master) external {
if (msg.sender != migrationMaster) throw;
if (_master == 0) throw;
migrationMaster = _master;
}
}