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SilkToken
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pragma solidity ^0.4.16; | |
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; | |
} | |
} | |
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; } | |
contract TokenERC20 { | |
// Public variables of the token | |
string public name; | |
string public symbol; | |
uint8 public decimals = 18; | |
// 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); | |
/** | |
* Constructor function | |
* | |
* Initializes contract with initial supply tokens to the creator of the contract | |
*/ | |
function TokenERC20( | |
uint256 initialSupply, | |
string tokenName, | |
string tokenSymbol | |
) public { | |
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount -- wei | |
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens | |
name = tokenName; // Set the name for display purposes | |
symbol = tokenSymbol; // Set the symbol for display purposes | |
} | |
/** | |
* 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(balanceOf[_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; | |
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); | |
} | |
/** | |
* 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 | |
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 | |
Burn(_from, _value); | |
return true; | |
} | |
} | |
/*************************************************/ | |
/** Author : Stryper **/ | |
/** Contents : Silk Custom Crypto Currency **/ | |
/** Date : 2018. 07 ~ **/ | |
/*************************************************/ | |
contract SilkToken is owned, TokenERC20 { | |
uint256 public sellPrice = 20180418134311; // Initialization with default value | |
uint256 public buyPrice = 1000000000000000000; // Initialization with default value | |
uint256 public limitAMT = 0; | |
bool public isPreSales = false; | |
mapping (address => bool) public frozenAccount; | |
/* This generates a public event on the blockchain that will notify clients */ | |
event FrozenFunds(address target, bool frozen); | |
/* Initializes contract with initial supply tokens to the creator of the contract */ | |
function SilkToken( | |
uint256 initialSupply, | |
string tokenName, | |
string tokenSymbol | |
) TokenERC20(initialSupply, tokenName, tokenSymbol) public {} | |
/* Internal transfer, only can be called by this contract */ | |
function _transfer(address _from, address _to, uint _value) internal { | |
require (_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead | |
require (balanceOf[_from] >= _value); // Check if the sender has enough | |
require (balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows | |
require(!frozenAccount[_from]); // Check if sender is frozen | |
require(!frozenAccount[_to]); // Check if recipient is frozen | |
balanceOf[_from] -= _value; // Subtract from the sender | |
balanceOf[_to] += _value; // Add the same to the recipient | |
Transfer(_from, _to, _value); | |
} | |
/// @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; | |
Transfer(0, this, mintedAmount); | |
Transfer(this, target, mintedAmount); | |
} | |
/// @notice `freeze? Prevent | Allow` `target` from sending & receiving tokens | |
/// @param target Address to be frozen | |
/// @param freeze either to freeze it or not | |
function freezeAccount(address target, bool freeze) onlyOwner public { | |
frozenAccount[target] = freeze; | |
FrozenFunds(target, freeze); | |
} | |
/// @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; | |
} | |
/// @notice Start presales with initializing presales amount | |
/// @param amtPreSales The amount of presales | |
function startPreSales(uint256 amtPreSales) onlyOwner public returns (uint256) { | |
require (balanceOf[owner] - amtPreSales > 0); | |
limitAMT = balanceOf[owner] - amtPreSales; | |
isPreSales = true; | |
return limitAMT; | |
} | |
/// @notice Stop presales with setting state variable | |
function stopPreSales() onlyOwner public { | |
isPreSales = false; | |
} | |
/// @notice Buy tokens from contract by sending ether | |
/************************************************************* | |
////////////////////////////////////////////////////////////// | |
/// function buy() payable public { | |
/// uint amount = msg.value / buyPrice; // calculates the amount | |
/// _transfer(this, msg.sender, amount); // makes the transfers | |
/// } | |
////////////////////////////////////////////////////////////// | |
*************************************************************/ | |
/// @notice Sell `amount` tokens to contract | |
/// @param amount amount of tokens to be sold | |
/************************************************************* | |
////////////////////////////////////////////////////////////// | |
/// function sell(uint256 amount) public { | |
/// require(this.balance >= amount * sellPrice); // checks if the contract has enough ether to buy | |
/// _transfer(msg.sender, this, amount); // makes the transfers | |
/// msg.sender.transfer(amount * sellPrice); // sends ether to the seller. It's important to do this last to avoid recursion attacks | |
/// } | |
////////////////////////////////////////////////////////////// | |
*************************************************************/ | |
/// @notice Get taitoss transaction amount | |
/// @param amtETH The amount of ether to convert with taitoss | |
function getTaiAMT(uint256 amtETH) public constant returns (uint256) { | |
uint256 amount = amtETH / buyPrice; | |
amount = amount * 10 ** uint256(decimals); | |
return amount; | |
} | |
/// @notice Get the balance of taitoss | |
function getBalanceTAI() public constant returns (uint256) { | |
uint256 balTAI; | |
balTAI = balanceOf[msg.sender]; | |
return balTAI; | |
} | |
function getSalesPrice() public constant returns (uint256) { | |
return buyPrice; | |
} | |
function getLeftPreSalesAMT() public constant returns (uint256) { | |
uint256 leftPSAMT; | |
leftPSAMT = balanceOf[owner] - limitAMT; | |
return leftPSAMT; | |
} | |
/// @notice Process presales transactions | |
function procPreSales() payable public returns (uint256) { | |
require (isPreSales == true); | |
uint256 amount = msg.value / buyPrice; // calculates the amount | |
amount = amount * 10 ** uint256(decimals); // calculates the amount | |
if ( balanceOf[owner] - amount <= limitAMT ){ | |
isPreSales = false; | |
} | |
_transfer(owner, msg.sender, amount); | |
owner.transfer(msg.value); | |
return amount; | |
} | |
/// @notice Process normal sales transactions | |
function procNormalSales() payable public returns (uint256) { | |
uint256 amount = msg.value / buyPrice; // calculates the amount | |
amount = amount * 10 ** uint256(decimals); // calculates the amount | |
_transfer(owner, msg.sender, amount); | |
owner.transfer(msg.value); | |
return amount; | |
} | |
/// @notice Process owner's buyback | |
/// @param seller Seller's EOA account address | |
function procNormalBuyBack(address seller) onlyOwner payable public returns (uint256) { | |
uint256 amount = msg.value / buyPrice; // calculates the amount | |
amount = amount * 10 ** uint256(decimals); // calculates the amount | |
_transfer(seller, msg.sender, amount); | |
seller.transfer(msg.value); | |
return amount; | |
} | |
} |
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