Created
May 3, 2018 12:43
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Eventa Token
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pragma solidity 0.4.22; | |
// ---------------------------------------------------------------------------- | |
// 'Eventa' CROWDSALE token contract | |
// | |
// Deployed to : 0x5304696a037321d14d325581860c50cc692dd825 | |
// Symbol : EVENTA | |
// Name : Eventa Token | |
// Total supply: 9000000000000000000000000000 | |
// Decimals : 18 | |
// | |
// Enjoy. | |
// | |
// (c) by Andrea Zanda, Eventa SRL, April 2018. The MIT Licence. | |
// ---------------------------------------------------------------------------- | |
// ---------------------------------------------------------------------------- | |
// ERC20 Token, with the addition of symbol, name and decimals and assisted | |
// token transfers | |
// ---------------------------------------------------------------------------- | |
contract EventaToken is ERC20Interface, Owned, SafeMath { | |
string public symbol; | |
string public name; | |
uint8 public decimals; | |
uint public _totalSupply; | |
uint public startDate; | |
uint public bonusEnds; | |
uint public endDate; | |
mapping(address => uint) balances; | |
mapping(address => mapping(address => uint)) allowed; | |
// ------------------------------------------------------------------------ | |
// Constructor | |
// ------------------------------------------------------------------------ | |
function EventaToken() public { | |
symbol = "EVENTA"; | |
name = "Eventa Token"; | |
decimals = 18; | |
bonusEnds = now + 1 weeks; | |
endDate = now + 7 weeks; | |
} | |
// ------------------------------------------------------------------------ | |
// Total supply | |
// ------------------------------------------------------------------------ | |
function totalSupply() public constant returns (uint) { | |
return _totalSupply - balances[address(0)]; | |
} | |
// ------------------------------------------------------------------------ | |
// Get the token balance for account `tokenOwner` | |
// ------------------------------------------------------------------------ | |
function balanceOf(address tokenOwner) public constant returns (uint balance) { | |
return balances[tokenOwner]; | |
} | |
// ------------------------------------------------------------------------ | |
// Transfer the balance from token owner's account to `to` account | |
// - Owner's account must have sufficient balance to transfer | |
// - 0 value transfers are allowed | |
// ------------------------------------------------------------------------ | |
function transfer(address to, uint tokens) public returns (bool success) { | |
balances[msg.sender] = safeSub(balances[msg.sender], tokens); | |
balances[to] = safeAdd(balances[to], tokens); | |
Transfer(msg.sender, to, tokens); | |
return true; | |
} | |
// ------------------------------------------------------------------------ | |
// Token owner can approve for `spender` to transferFrom(...) `tokens` | |
// from the token owner's account | |
// | |
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md | |
// recommends that there are no checks for the approval double-spend attack | |
// as this should be implemented in user interfaces | |
// ------------------------------------------------------------------------ | |
function approve(address spender, uint tokens) public returns (bool success) { | |
allowed[msg.sender][spender] = tokens; | |
Approval(msg.sender, spender, tokens); | |
return true; | |
} | |
// ------------------------------------------------------------------------ | |
// Transfer `tokens` from the `from` account to the `to` account | |
// | |
// The calling account must already have sufficient tokens approve(...)-d | |
// for spending from the `from` account and | |
// - From account must have sufficient balance to transfer | |
// - Spender must have sufficient allowance to transfer | |
// - 0 value transfers are allowed | |
// ------------------------------------------------------------------------ | |
function transferFrom(address from, address to, uint tokens) public returns (bool success) { | |
balances[from] = safeSub(balances[from], tokens); | |
allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens); | |
balances[to] = safeAdd(balances[to], tokens); | |
Transfer(from, to, tokens); | |
return true; | |
} | |
// ------------------------------------------------------------------------ | |
// Returns the amount of tokens approved by the owner that can be | |
// transferred to the spender's account | |
// ------------------------------------------------------------------------ | |
function allowance(address tokenOwner, address spender) public constant returns (uint remaining) { | |
return allowed[tokenOwner][spender]; | |
} | |
// ------------------------------------------------------------------------ | |
// Token owner can approve for `spender` to transferFrom(...) `tokens` | |
// from the token owner's account. The `spender` contract function | |
// `receiveApproval(...)` is then executed | |
// ------------------------------------------------------------------------ | |
function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) { | |
allowed[msg.sender][spender] = tokens; | |
Approval(msg.sender, spender, tokens); | |
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data); | |
return true; | |
} | |
// ------------------------------------------------------------------------ | |
// 3,000 EVENTA Tokens per 1 ETH | |
// ------------------------------------------------------------------------ | |
function () public payable { | |
require(now >= startDate && now <= endDate); | |
uint tokens; | |
if (now <= bonusEnds) { | |
tokens = msg.value * 3600; | |
} else { | |
tokens = msg.value * 3000; | |
} | |
balances[msg.sender] = safeAdd(balances[msg.sender], tokens); | |
_totalSupply = safeAdd(_totalSupply, tokens); | |
Transfer(address(0), msg.sender, tokens); | |
owner.transfer(msg.value); | |
} | |
// ------------------------------------------------------------------------ | |
// Owner can transfer out any accidentally sent ERC20 tokens | |
// ------------------------------------------------------------------------ | |
function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) { | |
return ERC20Interface(tokenAddress).transfer(owner, tokens); | |
} | |
} | |
// ---------------------------------------------------------------------------- | |
// Safe maths | |
// ---------------------------------------------------------------------------- | |
contract SafeMath { | |
function safeAdd(uint a, uint b) internal pure returns (uint c) { | |
c = a + b; | |
require(c >= a); | |
} | |
function safeSub(uint a, uint b) internal pure returns (uint c) { | |
require(b <= a); | |
c = a - b; | |
} | |
function safeMul(uint a, uint b) internal pure returns (uint c) { | |
c = a * b; | |
require(a == 0 || c / a == b); | |
} | |
function safeDiv(uint a, uint b) internal pure returns (uint c) { | |
require(b > 0); | |
c = a / b; | |
} | |
} | |
// ---------------------------------------------------------------------------- | |
// ERC Token Standard #20 Interface | |
// ---------------------------------------------------------------------------- | |
contract ERC20Interface { | |
function totalSupply() public constant returns (uint); | |
function balanceOf(address tokenOwner) public constant returns (uint balance); | |
function allowance(address tokenOwner, address spender) public constant 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 function to receive approval and execute function in one call | |
// ---------------------------------------------------------------------------- | |
contract ApproveAndCallFallBack { | |
function receiveApproval(address from, uint256 tokens, address token, bytes data) public; | |
} | |
// ---------------------------------------------------------------------------- | |
// Owned contract | |
// ---------------------------------------------------------------------------- | |
contract Owned { | |
address public owner; | |
address public newOwner; | |
event OwnershipTransferred(address indexed _from, address indexed _to); | |
function Owned() public { | |
owner = msg.sender; | |
} | |
modifier onlyOwner { | |
require(msg.sender == owner); | |
_; | |
} | |
function transferOwnership(address _newOwner) public onlyOwner { | |
newOwner = _newOwner; | |
} | |
function acceptOwnership() public { | |
require(msg.sender == newOwner); | |
OwnershipTransferred(owner, newOwner); | |
owner = newOwner; | |
newOwner = address(0); | |
} | |
} |
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