48 lines
1.2 KiB
Solidity
48 lines
1.2 KiB
Solidity
pragma solidity ^0.4.23;
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import "../Crowdsale.sol";
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import "../../token/ERC20/ERC20.sol";
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import "../../math/SafeMath.sol";
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/**
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* @title AllowanceCrowdsale
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* @dev Extension of Crowdsale where tokens are held by a wallet, which approves an allowance to the crowdsale.
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*/
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contract AllowanceCrowdsale is Crowdsale {
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using SafeMath for uint256;
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address public tokenWallet;
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/**
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* @dev Constructor, takes token wallet address.
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* @param _tokenWallet Address holding the tokens, which has approved allowance to the crowdsale
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*/
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constructor(address _tokenWallet) public {
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require(_tokenWallet != address(0));
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tokenWallet = _tokenWallet;
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}
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/**
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* @dev Checks the amount of tokens left in the allowance.
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* @return Amount of tokens left in the allowance
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*/
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function remainingTokens() public view returns (uint256) {
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return token.allowance(tokenWallet, this);
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}
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/**
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* @dev Overrides parent behavior by transferring tokens from wallet.
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* @param _beneficiary Token purchaser
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* @param _tokenAmount Amount of tokens purchased
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*/
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function _deliverTokens(
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address _beneficiary,
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uint256 _tokenAmount
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)
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internal
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{
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token.transferFrom(tokenWallet, _beneficiary, _tokenAmount);
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}
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}
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