Contract Name:
BioValueToken
Contract Source Code:
File 1 of 1 : BioValueToken
/**
*-------------------------------------
* --EARTHBI--
*-------------------------------------
* --ERC20 COMPATIBLE TOKEN
* --ETHEREUM BLOCKCHAIN
* --Name: ERA
* --Symbol: ERA
* --Total Supply: 955 MLN (max supply)
* --Decimal: 18
* ------------------------------------
* --Created by CRYPTODIAMOND SRL
* --Property of Bio Valore World S.p.A - Società Benefit
*/
pragma solidity ^0.4.25;
/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two unsigned integers, reverts on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
contract owned {
address public owner;
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) onlyOwner public {
require(newOwner != 0x0); //s
owner = newOwner;
}
}
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) external; }
contract BioValue is owned{
using SafeMath for uint; //SafeMath library
uint private nReceivers;
string public name;
string public symbol;
uint8 public decimals = 18;
uint256 public totalSupply;
uint256 public burned;
uint public percentage = 25; //x100 | 25(default) it can be change
mapping (address => bool) public receiversBioValueAddr;
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
event Transfer(address indexed from, address indexed to, uint256 value);
event Burn(address indexed from, uint256 value);
event NewPercentageSetted(address indexed from, uint newPercentage);
event NewReceiver(address indexed from, address indexed _ricevente); //s
/**
* Costruttore
*
* Inizializzo nel costruttore i dati del token.
*/
constructor(
uint256 initialSupply,
string tokenName,
string tokenSymbol,
address _ricevente
) public {
require(_ricevente != 0x0); //s
totalSupply = initialSupply * 10 ** uint256(decimals);
balanceOf[msg.sender] = totalSupply;
name = tokenName;
symbol = tokenSymbol;
nReceivers=1; //s
receiversBioValueAddr[_ricevente] = true;
burned = 0;
emit Transfer(address(0), msg.sender, totalSupply);
}
function setNewReceiverAddr(address _ricevente) onlyOwner public{
require(_ricevente != 0x0);
require(existReceiver(_ricevente) != true);
receiversBioValueAddr[_ricevente] = true;
nReceivers++;
emit NewReceiver(msg.sender, _ricevente); //notifico su blockchain che è stato settato un nuovo ricevente
}
function removeReceiverAddr(address _ricevente) onlyOwner public{
require(_ricevente != 0x0);
require(existReceiver(_ricevente) != false); //l'indirizzo deve esistere per essere rimosso
receiversBioValueAddr[_ricevente] = false;
}
function setNewPercentage(uint _newPercentage) onlyOwner public{ //solo il proprietario
require(_newPercentage <= 100);
require(_newPercentage >= 0);
percentage = _newPercentage;
emit NewPercentageSetted(msg.sender, _newPercentage); //notifico su blockchain l'avvenuta modifica della percentuale
}
function _transfer(address _from, address _to, uint _value) internal {
require(_to != 0x0);
require(balanceOf[_from] >= _value);
require(balanceOf[_to] + _value > balanceOf[_to]);
uint previousBalances = balanceOf[_from] + balanceOf[_to];
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
function _calcPercentage(uint _value, uint _percentage) internal constant returns(uint){
return (_value.mul(_percentage)).div(100); //s
}
function _burnPercentageAndTransfer(uint _value, address _sender, address _to) internal {
uint toBurn = _calcPercentage(_value, percentage);
approve(_sender, toBurn);
burnFrom(_sender, toBurn);
_transfer(_sender, _to, _value.sub(toBurn));
}
function existReceiver(address _ricevente) public constant returns(bool){
return receiversBioValueAddr[_ricevente];
}
function getReceiversNumber() public constant returns(uint){
return nReceivers;
}
function transfer(address _to, uint256 _value) public {
require(_to != address(this)); //s
if (existReceiver(_to)){
_burnPercentageAndTransfer(_value, msg.sender, _to);
}
else{
_transfer(msg.sender, _to, _value);
}
}
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;
}
function approve(address _spender, uint256 _value) public
returns (bool success) {
allowance[msg.sender][_spender] = _value;
return true;
}
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;
}
}
function burn(uint256 _value) public returns (bool success) {
require(balanceOf[msg.sender] >= _value);
balanceOf[msg.sender] -= _value;
totalSupply -= _value;
burned += _value; //contenitore dei token bruciati;
emit Burn(msg.sender, _value);
return true;
}
function burnFrom(address _from, uint256 _value) public returns (bool success) {
require(balanceOf[_from] >= _value);
require(_value <= allowance[_from][msg.sender]);
balanceOf[_from] -= _value;
allowance[_from][msg.sender] -= _value;
totalSupply -= _value;
burned += _value;
emit Burn(_from, _value);
return true;
}
}
contract BioValueToken is owned, BioValue {
mapping (address => bool) public frozenAccount;
event FrozenFunds(address target, bool frozen); //notifico il "congelamento"
constructor(
uint256 initialSupply,
string tokenName,
string tokenSymbol,
address _ricevente
) BioValue(initialSupply, tokenName, tokenSymbol, _ricevente) public {}
function _transfer(address _from, address _to, uint _value) internal {
require (_to != 0x0);
require (balanceOf[_from] >= _value);
require (balanceOf[_to] + _value > balanceOf[_to]);
require(!frozenAccount[_from]);
require(!frozenAccount[_to]);
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
emit Transfer(_from, _to, _value);
}
function freezeAccount(address target, bool freeze) onlyOwner public {
frozenAccount[target] = freeze;
emit FrozenFunds(target, freeze);
}
}