swap.cash

pragma cashscript ^0.4.0;

contract Swap() {
    function claimToken(sig selfSig, pubkey selfPk, pubkey otherPk, datasig selfDatasig, datasig otherDatasig, bytes message) {
        // Check that the message was signed by both parts
        require(checkDataSig(selfDatasig, message, otherPk));
        require(checkDataSig(otherDatasig, message, selfPk));
        
        // check itself sig
        require(checkSig(selfSig, selfPk));

        pubkey mSelfPk = int(message.split(?)[?]);
        bytes? mSelfToken = int(message.split(?)[?]);
        bytes? mSelfAmount = int(message.split(?)[?]);
        pubkey mOtherPk = int(message.split(?)[?]);
        bytes? mOtherToken = int(message.split(?)[?]);
        bytes? mOtherAmount = int(message.split(?)[?]);
        int minerFee = 1000;

        if (mSelfPk === selfPk) {
            bytes swap = new OutputNullData([mSelfToken, mSelfAmount]);
            int changeAmount = int(bytes(tx.value)) - minerFee;
            bytes32 change = new OutputP2SH(bytes8(changeAmount), hash160(selfPk));
            require(tx.hashOutputs == hash256(swap + change));
        } else {
            bytes swap = new OutputNullData([mOtherToken, mOtherAmount]);
            int changeAmount = int(bytes(tx.value)) - minerFee;
            bytes32 change = new OutputP2SH(bytes8(changeAmount), hash160(otherPk));
            require(tx.hashOutputs == hash256(swap + change));
        }
    }
}