Create GameLife

GameLife

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+pragma solidity ^0.4.25;
+
+/**
+ * @title SafeMath
+ * @dev Math operations with safety checks that throw on error
+ */
+library SafeMath {
+
+    /**
+    * @dev Multiplies two numbers, throws on overflow.
+    */
+    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
+        if (a == 0) {
+            return 0;
+        }
+        c = a * b;
+        assert(c / a == b);
+        return c;
+    }
+
+    /**
+    * @dev Integer division of two numbers, truncating the quotient.
+    */
+    function div(uint256 a, uint256 b) internal pure returns (uint256) {
+        // assert(b > 0); // Solidity automatically throws when dividing by 0
+        // uint256 c = a / b;
+        // assert(a == b * c + a % b); // There is no case in which this doesn't hold
+        return a / b;
+    }
+
+    /**
+    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
+    */
+    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
+        assert(b <= a);
+        return a - b;
+    }
+
+    /**
+    * @dev Adds two numbers, throws on overflow.
+    */
+    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
+        c = a + b;
+        assert(c >= a);
+        return c;
+    }
+}
+
+contract ForeignToken {
+    function balanceOf(address _owner) constant public returns (uint256);
+    function transfer(address _to, uint256 _value) public returns (bool);
+}
+
+contract ERC20Basic {
+    uint256 public totalSupply;
+    function balanceOf(address who) public constant returns (uint256);
+    function transfer(address to, uint256 value) public returns (bool);
+    event Transfer(address indexed from, address indexed to, uint256 value);
+}
+
+contract ERC20 is ERC20Basic {
+    function allowance(address owner, address spender) public constant returns (uint256);
+    function transferFrom(address from, address to, uint256 value) public returns (bool);
+    function approve(address spender, uint256 value) public returns (bool);
+    event Approval(address indexed owner, address indexed spender, uint256 value);
+}
+
+contract GameLife is ERC20 {
+
+    using SafeMath for uint256;
+    address owner = msg.sender;
+
+    mapping (address => uint256) balances;
+    mapping (address => mapping (address => uint256)) allowed;    
+
+    string public constant name = "GameLife";
+    string public constant symbol = "GME";
+    uint public constant decimals = 8;
+
+    uint256 public totalSupply = 10000000e8;
+    uint256 public totalDistributed = 0;    
+    uint256 public constant MIN_CONTRIBUTION = 1 ether / 10; // 0.1 Ether
+    uint256 public tokensPerEth = 5000e8;
+
+    event Transfer(address indexed _from, address indexed _to, uint256 _value);
+    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
+
+    event Distr(address indexed to, uint256 amount);
+    event DistrFinished();
+
+    event Airdrop(address indexed _owner, uint _amount, uint _balance);
+
+    event TokensPerEthUpdated(uint _tokensPerEth);
+
+    event Burn(address indexed burner, uint256 value);
+
+    bool public distributionFinished = false;
+
+    modifier canDistr() {
+        require(!distributionFinished);
+        _;
+    }
+
+    modifier onlyOwner() {
+        require(msg.sender == owner);
+        _;
+    }
+
+
+    constructor() public {
+        owner = msg.sender;    
+        distr(owner, totalDistributed);
+    }
+
+    function transferOwnership(address newOwner) onlyOwner public {
+        if (newOwner != address(0)) {
+            owner = newOwner;
+        }
+    }
+
+
+    function finishDistribution() onlyOwner canDistr public returns (bool) {
+        distributionFinished = true;
+        emit DistrFinished();
+        return true;
+    }
+
+    function distr(address _to, uint256 _amount) canDistr private returns (bool) {
+        totalDistributed = totalDistributed.add(_amount);        
+        balances[_to] = balances[_to].add(_amount);
+        emit Distr(_to, _amount);
+        emit Transfer(address(0), _to, _amount);
+
+        return true;
+    }
+
+    function doAirdrop(address _participant, uint _amount) internal {
+
+        require( _amount > 0 );      
+
+        require( totalDistributed < totalSupply );
+
+        balances[_participant] = balances[_participant].add(_amount);
+        totalDistributed = totalDistributed.add(_amount);
+
+        if (totalDistributed >= totalSupply) {
+            distributionFinished = true;
+        }
+
+        // log
+        emit Airdrop(_participant, _amount, balances[_participant]);
+        emit Transfer(address(0), _participant, _amount);
+    }
+
+    function adminClaimAirdrop(address _participant, uint _amount) public onlyOwner {        
+        doAirdrop(_participant, _amount);
+    }
+
+    function adminClaimAirdropMultiple(address[] _addresses, uint _amount) public onlyOwner {        
+        for (uint i = 0; i < _addresses.length; i++) doAirdrop(_addresses[i], _amount);
+    }
+
+    function updateTokensPerEth(uint _tokensPerEth) public onlyOwner {        
+        tokensPerEth = _tokensPerEth;
+        emit TokensPerEthUpdated(_tokensPerEth);
+    }
+
+    function () external payable {
+        getTokens();
+     }
+
+    function getTokens() payable canDistr  public {
+        uint256 tokens = 0;
+
+        // minimum contribution
+        require( msg.value >= MIN_CONTRIBUTION );
+
+        require( msg.value > 0 );
+
+        // get baseline number of tokens
+        tokens = tokensPerEth.mul(msg.value) / 1 ether;        
+        address investor = msg.sender;
+
+        if (tokens > 0) {
+            distr(investor, tokens);
+        }
+
+        if (totalDistributed >= totalSupply) {
+            distributionFinished = true;
+        }
+    }
+
+    function balanceOf(address _owner) constant public returns (uint256) {
+        return balances[_owner];
+    }
+
+    // mitigates the ERC20 short address attack
+    modifier onlyPayloadSize(uint size) {
+        assert(msg.data.length >= size + 4);
+        _;
+    }
+
+    function transfer(address _to, uint256 _amount) onlyPayloadSize(2 * 32) public returns (bool success) {
+
+        require(_to != address(0));
+        require(_amount <= balances[msg.sender]);
+
+        balances[msg.sender] = balances[msg.sender].sub(_amount);
+        balances[_to] = balances[_to].add(_amount);
+        emit Transfer(msg.sender, _to, _amount);
+        return true;
+    }
+
+    function transferFrom(address _from, address _to, uint256 _amount) onlyPayloadSize(3 * 32) public returns (bool success) {
+
+        require(_to != address(0));
+        require(_amount <= balances[_from]);
+        require(_amount <= allowed[_from][msg.sender]);
+
+        balances[_from] = balances[_from].sub(_amount);
+        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
+        balances[_to] = balances[_to].add(_amount);
+        emit Transfer(_from, _to, _amount);
+        return true;
+    }
+
+    function approve(address _spender, uint256 _value) public returns (bool success) {
+        // mitigates the ERC20 spend/approval race condition
+        if (_value != 0 && allowed[msg.sender][_spender] != 0) { return false; }
+        allowed[msg.sender][_spender] = _value;
+        emit Approval(msg.sender, _spender, _value);
+        return true;
+    }
+
+    function allowance(address _owner, address _spender) constant public returns (uint256) {
+        return allowed[_owner][_spender];
+    }
+
+    function getTokenBalance(address tokenAddress, address who) constant public returns (uint){
+        ForeignToken t = ForeignToken(tokenAddress);
+        uint bal = t.balanceOf(who);
+        return bal;
+    }
+
+    function withdraw() onlyOwner public {
+        address myAddress = this;
+        uint256 etherBalance = myAddress.balance;
+        owner.transfer(etherBalance);
+    }
+
+    function burn(uint256 _value) onlyOwner public {
+        require(_value <= balances[msg.sender]);
+        // no need to require value <= totalSupply, since that would imply the
+        // sender's balance is greater than the totalSupply, which *should* be an assertion failure
+
+        address burner = msg.sender;
+        balances[burner] = balances[burner].sub(_value);
+        totalSupply = totalSupply.sub(_value);
+        totalDistributed = totalDistributed.sub(_value);
+        emit Burn(burner, _value);
+    }
+
+    function withdrawForeignTokens(address _tokenContract) onlyOwner public returns (bool) {
+        ForeignToken token = ForeignToken(_tokenContract);
+        uint256 amount = token.balanceOf(address(this));
+        return token.transfer(owner, amount);
+    }
+}