Swap Ether and ERC20 tokens on the Ethereum network. This is beta software so, please, use with caution.

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1. The buyer calls create to begin the Swap.

TokenSwap.create(token, tokenAmount, price, seller, buyer, [recipient])

• token is the address of an ERC20-compatible token contract
• tokenAmount is the amount of tokens to be sold
• price is the total price, in Wei, to be paid for the tokens
• seller is the address of the token holder
• buyer is the address of the Ether holder (this address must send the payment to conclude the Swap)
• recipient is an optional argument specifying an address to receive the tokens; if no recipient is specified then buyer is used

2. The seller approves the TokenSwap contract to spend tokenAmount tokens, using the ERC20 approve function.
3. The buyer calls conclude with price Wei.

If the tokens have not been approved then the call will fail. If the tokens have been, and the value of the call is sufficient, the tokens will be sent to the recipient (or buyer, if none is specified) and the Ether to the seller.

An additional cancel function has also been provided. The buyer, seller and recipient are all able to cancel a Swap at any time before it is concluded. Any tokens that have been approved will be refunded.

1. Install truffle and openzeppelin-solidity by running npm i.
2. Compile the contracts using truffle compile.
3. Run the test by installing and launching ganache, then running truffle test.

MIT © Luke Mitchell