265 lines
10 KiB
Solidity
265 lines
10 KiB
Solidity
pragma solidity ^0.4.18;
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// ----------------------------------------------------------------------------
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// 'DECA' DEcentralized CArbon tokens - ITDE (initial token distribution event)
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//
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// Deployed to : 0x4fBE079198ce239fB02E967578aACB28C0CE31ef
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// Network : Ropsten
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// Symbol : DECA
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// Name : Decentralized Carbon tokens
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// Total supply: Gazillion
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// Decimals : 18
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//
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// Enjoy.
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//
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// (c) by Moritz Neto & Daniel Bar with BokkyPooBah / Bok Consulting Pty Ltd Au 2017. The MIT Licence.
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// fork and modifications to fix DECA's ICO needs by p1r0 <p1r0@neetsec.com> and kaicudon <kaicudon@neetsec.com>
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// Safe maths
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// ----------------------------------------------------------------------------
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contract SafeMath {
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function safeAdd(uint a, uint b) internal pure returns (uint c) {
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c = a + b;
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require(c >= a);
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}
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function safeSub(uint a, uint b) internal pure returns (uint c) {
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require(b <= a);
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c = a - b;
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}
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function safeMul(uint a, uint b) internal pure returns (uint c) {
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c = a * b;
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require(a == 0 || c / a == b);
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}
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function safeDiv(uint a, uint b) internal pure returns (uint c) {
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require(b > 0);
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c = a / b;
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}
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}
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// ----------------------------------------------------------------------------
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// DECA Token Standard #20 Interface
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// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
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// ----------------------------------------------------------------------------
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contract DECAInterface {
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function totalSupply() public constant returns (uint);
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function balanceOf(address tokenOwner) public constant returns (uint balance);
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function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
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function transfer(address to, uint tokens) public returns (bool success);
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function approve(address spender, uint tokens) public returns (bool success);
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function transferFrom(address from, address to, uint tokens) public returns (bool success);
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event Transfer(address indexed from, address indexed to, uint tokens);
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event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
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}
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// ----------------------------------------------------------------------------
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// Contract function to receive approval and execute function in one call
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//
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// Borrowed from MiniMeToken
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// ----------------------------------------------------------------------------
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contract ApproveAndCallFallBack {
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function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
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}
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// ----------------------------------------------------------------------------
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// Owned contract
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// ----------------------------------------------------------------------------
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contract Owned {
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address public owner;
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address public newOwner;
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//this is the ipfs orbit database address as Half1+Half2 strings
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string public _CCDBAddress;
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//uint public _CarbonCreditsDBAddress;
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event OwnershipTransferred(address indexed _from, address indexed _to);
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constructor () public {
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owner = msg.sender;
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}
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modifier onlyOwner {
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require(msg.sender == owner);
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_;
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}
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function updateCCDBAddress(string CCDBAddress) public onlyOwner {
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_CCDBAddress = CCDBAddress;
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}
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function transferOwnership(address _newOwner) public onlyOwner {
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newOwner = _newOwner;
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}
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function acceptOwnership() public {
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require(msg.sender == newOwner);
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emit OwnershipTransferred(owner, newOwner);
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owner = newOwner;
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newOwner = address(0);
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}
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}
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// ----------------------------------------------------------------------------
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// ERC20 Token, with the addition of symbol, name and decimals and assisted
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// token transfers
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// ----------------------------------------------------------------------------
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contract DECAToken is DECAInterface, Owned, SafeMath {
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string public symbol;
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string public name;
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uint8 public decimals;
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uint public _totalSupply;
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uint public startDate;
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uint public preICOEnds;
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uint public bonus1Ends;
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uint public bonus2Ends;
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uint public endDate;
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mapping(address => uint) balances;
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mapping(address => mapping(address => uint)) allowed;
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// ------------------------------------------------------------------------
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// Constructor
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// ------------------------------------------------------------------------
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constructor () public {
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symbol = "DECA";
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name = "Decentralized Carbon tokens";
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decimals = 18;
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//for testing change weeks for days...
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preICOEnds = now + 1 days;
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bonus1Ends = now + 3 days;
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bonus2Ends = now + 6 days;
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endDate = now + 11 days;
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}
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// ------------------------------------------------------------------------
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// Total supply: Get the total token supply
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// ------------------------------------------------------------------------
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function totalSupply() public constant returns (uint) {
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return _totalSupply - balances[address(0)];
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}
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// ------------------------------------------------------------------------
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// Get the token balance for account `tokenOwner`
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// ------------------------------------------------------------------------
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function balanceOf(address tokenOwner) public constant returns (uint balance) {
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return balances[tokenOwner];
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}
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// ------------------------------------------------------------------------
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// Transfer the balance from token owner's account to `to` account
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// - Owner's account must have sufficient balance to transfer
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// - 0 value transfers are allowed
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// ------------------------------------------------------------------------
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function transfer(address to, uint tokens) public returns (bool success) {
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balances[msg.sender] = safeSub(balances[msg.sender], tokens);
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balances[to] = safeAdd(balances[to], tokens);
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emit Transfer(msg.sender, to, tokens);
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return true;
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}
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// ------------------------------------------------------------------------
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// Token owner can approve for `spender` to transferFrom(...) `tokens`
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// from the token owner's account
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//
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// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
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// recommends that there are no checks for the approval double-spend attack
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// as this should be implemented in user interfaces
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// ------------------------------------------------------------------------
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function approve(address spender, uint tokens) public returns (bool success) {
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allowed[msg.sender][spender] = tokens;
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emit Approval(msg.sender, spender, tokens);
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return true;
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}
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// ------------------------------------------------------------------------
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// Transfer `tokens` from the `from` account to the `to` account
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//
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// The calling account must already have sufficient tokens approve(...)-d
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// for spending from the `from` account and
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// - From account must have sufficient balance to transfer
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// - Spender must have sufficient allowance to transfer
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// - 0 value transfers are allowed
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// ------------------------------------------------------------------------
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function transferFrom(address from, address to, uint tokens) public returns (bool success) {
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balances[from] = safeSub(balances[from], tokens);
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allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
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balances[to] = safeAdd(balances[to], tokens);
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emit Transfer(from, to, tokens);
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return true;
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}
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// ------------------------------------------------------------------------
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// Returns the amount of tokens approved by the owner that can be
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// transferred to the spender's account
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// ------------------------------------------------------------------------
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function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
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return allowed[tokenOwner][spender];
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}
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// ------------------------------------------------------------------------
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// Token owner can approve for `spender` to transferFrom(...) `tokens`
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// from the token owner's account. The `spender` contract function
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// `receiveApproval(...)` is then executed
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// ------------------------------------------------------------------------
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function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
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allowed[msg.sender][spender] = tokens;
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emit Approval(msg.sender, spender, tokens);
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ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
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return true;
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}
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// ------------------------------------------------------------------------
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// 1,000 DECA Tokens per 1 ETH
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// ------------------------------------------------------------------------
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function () public payable {
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require(now >= startDate && now <= endDate);
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uint tokens;
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uint toOwner;
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uint toSender;
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uint percentage;
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percentage = 2; // percentage that goes to the owner 25% to carbon credits fund
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if (now <= preICOEnds) {
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tokens = msg.value * 2000;
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} else if (now > preICOEnds && now <= bonus1Ends ) {
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tokens = msg.value * 1500;
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} else if (now > bonus1Ends && now <= bonus2Ends) {
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tokens = msg.value * 1250;
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} else {
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tokens = msg.value * 1000;
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}
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toOwner = tokens / percentage; // percentage assigned to the contract owner (DAO)
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toSender = tokens; // tokens goes to sender
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balances[msg.sender] = safeAdd(balances[msg.sender], toSender);
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balances[owner] = safeAdd(balances[owner], toOwner);
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_totalSupply = safeAdd(_totalSupply, toSender);
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_totalSupply = safeAdd(_totalSupply, toOwner);
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emit Transfer(address(0), msg.sender, toSender);
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emit Transfer(address(0), owner, toOwner);
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owner.transfer(msg.value);
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}
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// ------------------------------------------------------------------------
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// Owner can transfer out any accidentally sent ERC20 tokens
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// ------------------------------------------------------------------------
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function transferAnyDECAToken(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
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return DECAInterface(tokenAddress).transfer(owner, tokens);
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}
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}
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