Created
January 7, 2019 12:47
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Osom Token
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pragma solidity ^0.5.0; | |
import "./OsomToken.sol"; | |
contract OsomTokenSale { | |
address payable admin; | |
OsomToken public tokenContract; | |
uint256 public tokenPrice; | |
uint256 public tokensSold; | |
event Sell(address _buyer, uint256 _amount); | |
constructor(OsomToken _tokenContract, uint256 _tokenPrice) public { | |
admin = msg.sender; | |
tokenContract = _tokenContract; | |
tokenPrice = _tokenPrice; | |
} | |
function multiply(uint x, uint y) internal pure returns (uint z) { | |
require(y == 0 || (z = x * y) / y == x); | |
} | |
function buyTokens(uint256 _numberOfTokens) public payable { | |
require(msg.value == multiply(_numberOfTokens, tokenPrice)); | |
require(tokenContract.balanceOf(address(this)) >= _numberOfTokens); | |
require(tokenContract.transfer(msg.sender, _numberOfTokens)); | |
tokensSold += _numberOfTokens; | |
emit Sell(msg.sender, _numberOfTokens); | |
} | |
function endSale() public { | |
require(msg.sender == admin); | |
require(tokenContract.transfer(admin, tokenContract.balanceOf(address(this)))); | |
// UPDATE: Let's not destroy the contract here | |
// Just transfer the balance to the admin | |
admin.transfer(address(this).balance); | |
} | |
} |
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pragma solidity ^0.5.0; | |
contract OsomToken { | |
string public name = "Osom Token"; | |
string public symbol = "OSOM"; | |
string public standard = "OSOM Token v1.0"; | |
uint256 public totalSupply; | |
event Transfer( | |
address indexed _from, | |
address indexed _to, | |
uint256 _value | |
); | |
event Approval( | |
address indexed _owner, | |
address indexed _spender, | |
uint256 _value | |
); | |
mapping(address => uint256) public balanceOf; | |
mapping(address => mapping(address => uint256)) public allowance; | |
constructor(uint256 _initialSupply) public { | |
balanceOf[msg.sender] = _initialSupply; | |
totalSupply = _initialSupply; | |
} | |
function transfer(address _to, uint256 _value) public returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); | |
balanceOf[msg.sender] -= _value; | |
balanceOf[_to] += _value; | |
emit Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
function approve(address _spender, uint256 _value) public returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
emit Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) { | |
require(_value <= balanceOf[_from]); | |
require(_value <= allowance[_from][msg.sender]); | |
balanceOf[_from] -= _value; | |
balanceOf[_to] += _value; | |
allowance[_from][msg.sender] -= _value; | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
} |
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