mirror of
https://github.com/sharkdp/bat
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90 lines
2.8 KiB
Text
90 lines
2.8 KiB
Text
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# IndividuallyCappedCrowdsale
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# Contributors: Binod Nirvan
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# This file is released under Apache 2.0 license.
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# @dev Crowdsale with a limit for total contributions.
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# Ported from Open Zeppelin
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# https://github.com/OpenZeppelin
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#
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# See https://github.com/OpenZeppelin
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# Open Zeppelin tests ported: Crowdsale.test.js
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#@dev ERC20/223 Features referenced by this contract
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contract TokenContract:
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def transfer(_to: address, _value: uint256) -> bool: modifying
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# Event for token purchase logging
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# @param _purchaser who paid for the tokens
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# @param _beneficiary who got the tokens
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# @param _value weis paid for purchase
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# @param _amount amount of tokens purchased
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TokenPurchase: event({_purchaser: indexed(address), _beneficiary: indexed(address), _value: uint256(wei), _amount: uint256})
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# The token being sold
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token: public(address)
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#Address where funds are collected
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wallet: public(address)
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# How many token units a buyer gets per wei.
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# The rate is the conversion between wei and the smallest and indivisible token unit.
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# So, if you are using a rate of 1 with a DetailedERC20 token with 3 decimals called TOK
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# 1 wei will give you 1 unit, or 0.001 TOK.
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rate: public(uint256)
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#Amount of wei raised
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weiRaised: public(uint256(wei))
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@public
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def __init__(_rate: uint256, _wallet: address, _token: address):
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"""
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@dev Initializes this contract
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@param _rate Number of token units a buyer gets per wei
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@param _wallet Address where collected funds will be forwarded to
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@param _token Address of the token being sold
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"""
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assert _rate > 0, "Invalid value supplied for the parameter \"_rate\"."
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assert _wallet != ZERO_ADDRESS, "Invalid wallet address."
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assert _token != ZERO_ADDRESS, "Invalid token address."
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self.rate = _rate
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self.wallet = _wallet
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self.token = _token
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@private
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@constant
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def getTokenAmount(_weiAmount: uint256) -> uint256:
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return _weiAmount * self.rate
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@private
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def processTransaction(_sender: address, _beneficiary: address, _weiAmount: uint256(wei)):
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#pre validate
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assert _beneficiary != ZERO_ADDRESS, "Invalid address."
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assert _weiAmount != 0, "Invalid amount received."
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#calculate the number of tokens for the Ether contribution.
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tokens: uint256 = self.getTokenAmount(as_unitless_number(_weiAmount))
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self.weiRaised += _weiAmount
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#process purchase
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assert TokenContract(self.token).transfer(_beneficiary, tokens), "Could not forward funds due to an unknown error."
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log.TokenPurchase(_sender, _beneficiary, _weiAmount, tokens)
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#forward funds to the receiving wallet address.
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send(self.wallet, _weiAmount)
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#post validate
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@public
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@payable
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def buyTokens(_beneficiary: address):
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self.processTransaction(msg.sender, _beneficiary, msg.value)
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@public
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@payable
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def __default__():
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self.processTransaction(msg.sender, msg.sender, msg.value)
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