/
flatoken.sol
315 lines (240 loc) · 9.52 KB
/
flatoken.sol
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pragma solidity 0.5.7;
// ----------------------------------------------------------------------------
// 'FLT' 'FLAToken' token contract
//
// Symbol : FLT
// Name : FLAToken
// Total supply : 75,000,00.000000000000000000
// Decimals : 18
//
// The real cryptocurrency :D
//
// (c) FLAToken 2019. The MIT Licence.
// ----------------------------------------------------------------------------
library SafeMath {
function add(uint a, uint b) internal pure returns (uint c) {
c = a + b;
require(c >= a);
}
function sub(uint a, uint b) internal pure returns (uint c) {
require(b <= a);
c = a - b;
}
function mul(uint a, uint b) internal pure returns (uint c) {
if(a == 0) {
return 0;
}
c = a * b;
require(c / a == b);
}
function div(uint a, uint b) internal pure returns (uint c) {
require(b > 0);
c = a / b;
}
function mod(uint a, uint b) internal pure returns (uint c) {
require(b != 0);
c = a % b;
}
}
contract ERC20Interface {
function totalSupply() public view returns (uint);
function balanceOf(address tokenOwner) public view returns (uint balance);
function allowance(address tokenOwner, address spender) public view returns (uint remaining);
function transfer(address to, uint tokens) public returns (bool success);
function approve(address spender, uint tokens) public returns (bool success);
function transferFrom(address from, address to, uint tokens) public returns (bool success);
event Transfer(address indexed from, address indexed to, uint tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;
}
contract Owned {
address payable public owner;
address payable public newOwner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address payable _newOwner) public onlyOwner {
newOwner = _newOwner;
}
function acceptOwnership() public {
require(msg.sender == newOwner);
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
newOwner = address(0);
}
}
contract FLAToken is ERC20Interface, Owned {
using SafeMath for uint;
string public symbol;
string public name;
string public version = 'FLT1.0';
uint8 public decimals;
uint public tokenSold;
uint _totalSupply;
uint _unitsOneEthCanBuy;
uint _bonusEachTarget;
uint _bonusAmount;
bool _salesOpen;
mapping(address => uint) balances;
mapping(address => mapping(address => uint)) allowed;
struct Topic {
address sender;
string argument;
uint likes;
uint dislikes;
bool isValue;
}
uint _tokensToSendTopic;
mapping(bytes32 => Topic) topics;
bytes32[] topicsList;
event Upvote(bytes32 topicKey, uint likes);
event Downvote(bytes32 topicKey, uint dislikes);
event NewTopic(bytes32 topicKey);
constructor() public {
symbol = "FLT";
name = "FLAToken";
decimals = 18;
_totalSupply = 75000000 * 10**uint(decimals);
_unitsOneEthCanBuy = 3750;
_tokensToSendTopic = 1 * 10**uint(decimals);
_bonusEachTarget = 1000000000000000000; //1 ETH
_bonusAmount = 100 * 10**uint(decimals);
tokenSold = 0;
balances[owner] = _totalSupply;
emit Transfer(address(0), owner, _totalSupply);
_salesOpen = true;
}
function totalSupply() public view returns (uint) {
return _totalSupply;
}
function availableSupply() public view returns (uint) {
return balances[owner];
}
function balanceOf(address tokenOwner) public view returns (uint balance) {
return balances[tokenOwner];
}
function unitsOneEthCanBuy() public view returns (uint) {
return _calculateUnitsOneEthCanBuy();
}
function setUnitsOneEthCanBuy(uint tokens) public onlyOwner {
_unitsOneEthCanBuy = tokens;
}
function _calculateUnitsOneEthCanBuy() private view returns (uint tokens){
if(tokenSold > 60000000 * 10**uint(decimals)) {
return 500;
} else if (tokenSold > 45000000 * 10**uint(decimals)) {
return 1500;
} else if (tokenSold > 30000000 * 10**uint(decimals)) {
return 2500;
} else if (tokenSold > 15000000 * 10**uint(decimals)) {
return 3000;
}
return _unitsOneEthCanBuy;
}
function closeICO() public onlyOwner {
_salesOpen = false;
balances[owner] = 0;
}
function transfer(address to, uint tokens) public returns (bool success) {
require(tokens > 0);
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[to] = balances[to].add(tokens);
emit Transfer(msg.sender, to, tokens);
return true;
}
function approve(address spender, uint tokens) public returns (bool success) {
require((tokens == 0) || (allowed[msg.sender][spender] == 0));
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
function transferFrom(address from, address to, uint tokens) public returns (bool success) {
require(tokens > 0);
allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
balances[from] = balances[from].sub(tokens);
balances[to] = balances[to].add(tokens);
emit Transfer(from, to, tokens);
return true;
}
function allowance(address tokenOwner, address spender) public view returns (uint remaining) {
return allowed[tokenOwner][spender];
}
function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
return true;
}
function buy() external payable {
require(msg.value > 0 && _salesOpen);
uint amount = msg.value.mul(_calculateUnitsOneEthCanBuy());
if(msg.value >= _bonusEachTarget) {
amount = amount.add(_bonusAmount.mul(msg.value.div(_bonusEachTarget)));
}
require(amount > 0 && balances[owner] >= amount);
balances[owner] = balances[owner].sub(amount);
balances[msg.sender] = balances[msg.sender].add(amount);
tokenSold = tokenSold.add(amount);
emit Transfer(owner, msg.sender, amount);
owner.transfer(msg.value);
}
function () external payable {
revert();
}
function newTopic(bytes32 topicKey, string memory argument) public returns(bool success) {
require(!topics[topicKey].isValue);
balances[msg.sender] = balances[msg.sender].sub(_tokensToSendTopic);
balances[owner] = balances[owner].add(_tokensToSendTopic);
emit Transfer(msg.sender, owner, _tokensToSendTopic);
topics[topicKey].argument = argument;
topics[topicKey].sender = msg.sender;
topics[topicKey].likes = 0;
topics[topicKey].dislikes = 0;
topics[topicKey].isValue = true;
topicsList.push(topicKey);
emit NewTopic(topicKey);
return true;
}
function getTopic(bytes32 topicKey) public view returns (string memory argument, address sender, uint likes, uint dislikes) {
Topic memory t = topics[topicKey];
require(t.isValue);
return(t.argument, t.sender, t.likes, t.dislikes);
}
function getTopicsCount() public view returns (uint topicsCount) {
return topicsList.length;
}
function getTopicAtIndex(uint row) public view returns (bytes32 key, string memory arg, address sender, uint likes, uint dislikes) {
Topic memory t = topics[topicsList[row]];
require(t.isValue);
return(topicsList[row], t.argument, t.sender, t.likes, t.dislikes);
}
function upvote(bytes32 topicKey, uint tokens) public returns (bool success) {
require(tokens > 0);
Topic storage t = topics[topicKey];
require(t.isValue && t.sender != msg.sender);
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[t.sender] = balances[t.sender].add(tokens);
emit Transfer(msg.sender, t.sender, tokens);
t.likes = t.likes.add(tokens);
emit Upvote(topicKey, t.likes);
return true;
}
function downvote(bytes32 topicKey, uint tokens) public returns (bool success) {
require(tokens > 0);
Topic storage t = topics[topicKey];
require(t.isValue && t.sender != msg.sender);
balances[msg.sender] = balances[msg.sender].sub(tokens);
balances[t.sender] = balances[t.sender].add(tokens);
emit Transfer(msg.sender, t.sender, tokens);
t.dislikes = t.dislikes.add(tokens);
emit Downvote(topicKey, t.dislikes);
return true;
}
}