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| Original file line number | Diff line number | Diff line change |
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| pragma solidity ^0.4.18; | ||
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| import "../token/ERC20/MintableToken.sol"; | ||
| import "../token/ERC20/ERC20.sol"; | ||
| import "../math/SafeMath.sol"; | ||
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| /** | ||
| * @title Crowdsale | ||
| * @dev Crowdsale is a base contract for managing a token crowdsale. | ||
| * Crowdsales have a start and end timestamps, where investors can make | ||
| * token purchases and the crowdsale will assign them tokens based | ||
| * on a token per ETH rate. Funds collected are forwarded to a wallet | ||
| * as they arrive. The contract requires a MintableToken that will be | ||
| * minted as contributions arrive, note that the crowdsale contract | ||
| * must be owner of the token in order to be able to mint it. | ||
| * @dev Crowdsale is a base contract for managing a token crowdsale, | ||
| * allowing investors to purchase tokens with ether. This contract implements | ||
| * such functionality in its most fundamental form and can be extended to provide additional | ||
| * functionality and/or custom behavior. | ||
| * The external interface represents the basic interface for purchasing tokens, and conform | ||
| * the base architecture for crowdsales. They are *not* intended to be modified / overriden. | ||
| * The internal interface conforms the extensible and modifiable surface of crowdsales. Override | ||
| * the methods to add functionality. Consider using 'super' where appropiate to concatenate | ||
| * behavior. | ||
| */ | ||
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| contract Crowdsale { | ||
| using SafeMath for uint256; | ||
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| // The token being sold | ||
| MintableToken public token; | ||
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| // start and end timestamps where investments are allowed (both inclusive) | ||
| uint256 public startTime; | ||
| uint256 public endTime; | ||
| ERC20 public token; | ||
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| // address where funds are collected | ||
| // Address where funds are collected | ||
| address public wallet; | ||
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| // how many token units a buyer gets per wei | ||
| // How many token units a buyer gets per wei | ||
| uint256 public rate; | ||
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| // amount of raised money in wei | ||
| // Amount of wei raised | ||
| uint256 public weiRaised; | ||
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| /** | ||
| * event for token purchase logging | ||
| * Event for token purchase logging | ||
| * @param purchaser who paid for the tokens | ||
| * @param beneficiary who got the tokens | ||
| * @param value weis paid for purchase | ||
| * @param amount amount of tokens purchased | ||
| */ | ||
| event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount); | ||
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| function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet, MintableToken _token) public { | ||
| require(_startTime >= now); | ||
| require(_endTime >= _startTime); | ||
| /** | ||
| * @param _rate Number of token units a buyer gets per wei | ||
| * @param _wallet Address where collected funds will be forwarded to | ||
| * @param _token Address of the token being sold | ||
| */ | ||
| function Crowdsale(uint256 _rate, address _wallet, ERC20 _token) public { | ||
| require(_rate > 0); | ||
| require(_wallet != address(0)); | ||
| require(_token != address(0)); | ||
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| startTime = _startTime; | ||
| endTime = _endTime; | ||
| rate = _rate; | ||
| wallet = _wallet; | ||
| token = _token; | ||
| } | ||
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| // fallback function can be used to buy tokens | ||
| // ----------------------------------------- | ||
| // Crowdsale external interface | ||
| // ----------------------------------------- | ||
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| /** | ||
| * @dev fallback function ***DO NOT OVERRIDE*** | ||
| */ | ||
| function () external payable { | ||
| buyTokens(msg.sender); | ||
| } | ||
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| // low level token purchase function | ||
| function buyTokens(address beneficiary) public payable { | ||
| require(beneficiary != address(0)); | ||
| require(validPurchase()); | ||
| /** | ||
| * @dev low level token purchase ***DO NOT OVERRIDE*** | ||
| * @param _beneficiary Address performing the token purchase | ||
| */ | ||
| function buyTokens(address _beneficiary) public payable { | ||
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| uint256 weiAmount = msg.value; | ||
| _preValidatePurchase(_beneficiary, weiAmount); | ||
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| // calculate token amount to be created | ||
| uint256 tokens = getTokenAmount(weiAmount); | ||
| uint256 tokens = _getTokenAmount(weiAmount); | ||
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| // update state | ||
| weiRaised = weiRaised.add(weiAmount); | ||
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| token.mint(beneficiary, tokens); | ||
| TokenPurchase(msg.sender, beneficiary, weiAmount, tokens); | ||
| _processPurchase(_beneficiary, tokens); | ||
| TokenPurchase(msg.sender, _beneficiary, weiAmount, tokens); | ||
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| _updatePurchasingState(_beneficiary, weiAmount); | ||
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| _forwardFunds(); | ||
| _postValidatePurchase(_beneficiary, weiAmount); | ||
| } | ||
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| // ----------------------------------------- | ||
| // Internal interface (extensible) | ||
| // ----------------------------------------- | ||
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| /** | ||
| * @dev Validation of an incoming purchase. Use require statemens to revert state when conditions are not met. Use super to concatenate validations. | ||
| * @param _beneficiary Address performing the token purchase | ||
| * @param _weiAmount Value in wei involved in the purchase | ||
| */ | ||
| function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal { | ||
| require(_beneficiary != address(0)); | ||
| require(_weiAmount != 0); | ||
| } | ||
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| forwardFunds(); | ||
| /** | ||
| * @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid conditions are not met. | ||
| * @param _beneficiary Address performing the token purchase | ||
| * @param _weiAmount Value in wei involved in the purchase | ||
| */ | ||
| function _postValidatePurchase(address _beneficiary, uint256 _weiAmount) internal { | ||
| // optional override | ||
| } | ||
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| // @return true if crowdsale event has ended | ||
| function hasEnded() public view returns (bool) { | ||
| return now > endTime; | ||
| /** | ||
| * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens. | ||
| * @param _beneficiary Address performing the token purchase | ||
| * @param _tokenAmount Number of tokens to be emitted | ||
| */ | ||
| function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal { | ||
| token.transfer(_beneficiary, _tokenAmount); | ||
| } | ||
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| // Override this method to have a way to add business logic to your crowdsale when buying | ||
| function getTokenAmount(uint256 weiAmount) internal view returns(uint256) { | ||
| return weiAmount.mul(rate); | ||
| /** | ||
| * @dev Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens. | ||
| * @param _beneficiary Address receiving the tokens | ||
| * @param _tokenAmount Number of tokens to be purchased | ||
| */ | ||
| function _processPurchase(address _beneficiary, uint256 _tokenAmount) internal { | ||
| _deliverTokens(_beneficiary, _tokenAmount); | ||
| } | ||
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| // send ether to the fund collection wallet | ||
| // override to create custom fund forwarding mechanisms | ||
| function forwardFunds() internal { | ||
| wallet.transfer(msg.value); | ||
| /** | ||
| * @dev Override for extensions that require an internal state to check for validity (current user contributions, etc.) | ||
| * @param _beneficiary Address receiving the tokens | ||
| * @param _weiAmount Value in wei involved in the purchase | ||
| */ | ||
| function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal { | ||
| // optional override | ||
| } | ||
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| // @return true if the transaction can buy tokens | ||
| function validPurchase() internal view returns (bool) { | ||
| bool withinPeriod = now >= startTime && now <= endTime; | ||
| bool nonZeroPurchase = msg.value != 0; | ||
| return withinPeriod && nonZeroPurchase; | ||
| /** | ||
| * @dev Override to extend the way in which ether is converted to tokens. | ||
| * @param _weiAmount Value in wei to be converted into tokens | ||
| * @return Number of tokens that can be purchased with the specified _weiAmount | ||
| */ | ||
| function _getTokenAmount(uint256 _weiAmount) internal view returns (uint256) { | ||
| return _weiAmount.mul(rate); | ||
| } | ||
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| /** | ||
| * @dev Determines how ETH is stored/forwarded on purchases. | ||
| */ | ||
| function _forwardFunds() internal { | ||
| wallet.transfer(msg.value); | ||
| } | ||
| } |
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35 changes: 35 additions & 0 deletions
35
contracts/crowdsale/distribution/PostDeliveryCrowdsale.sol
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,35 @@ | ||
| pragma solidity ^0.4.18; | ||
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| import "../validation/TimedCrowdsale.sol"; | ||
| import "../../token/ERC20/ERC20.sol"; | ||
| import "../../math/SafeMath.sol"; | ||
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| /** | ||
| * @title PostDeliveryCrowdsale | ||
| * @dev Crowdsale that locks tokens from withdrawal until it ends. | ||
| */ | ||
| contract PostDeliveryCrowdsale is TimedCrowdsale { | ||
| using SafeMath for uint256; | ||
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| mapping(address => uint256) public balances; | ||
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| /** | ||
| * @dev Overrides parent by storing balances instead of issuing tokens right away. | ||
| * @param _beneficiary Token purchaser | ||
| * @param _tokenAmount Amount of tokens purchased | ||
| */ | ||
| function _processPurchase(address _beneficiary, uint256 _tokenAmount) internal { | ||
| balances[_beneficiary] = balances[_beneficiary].add(_tokenAmount); | ||
| } | ||
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| /** | ||
| * @dev Withdraw tokens only after crowdsale ends. | ||
| */ | ||
| function withdrawTokens() public { | ||
| require(hasClosed()); | ||
| uint256 amount = balances[msg.sender]; | ||
| require(amount > 0); | ||
| balances[msg.sender] = 0; | ||
| _deliverTokens(msg.sender, amount); | ||
| } | ||
| } |
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