Topic: 2 BTC Bounty: PHP / JSON-RPC Sweep Key Function (Read 1978 times)

/**
 * Take the entire Balance of Address A and send it to Address B
 *
 * @param jsonRPCClient $jsonrpc A valid jsonRPCClient connected to bitcoind
 * @param string $addrA Address to sweep
 * @param string $addrB Address to receive swept funds
 * @param int $fee Fee to be applied (satoshis), is computed as ($perkb * size in kb) if $fee == -1
 *  else it is applied directly
 * @param int $perkb Fee (satoshis) to be applied per kb of transaction size
 * @param int $minconf Minimum number of confirmations required to be swept
 * @return array Result contains 2 elements, success and either message or txid.
 *  If success == true then txid contains the transaction id else message contains the error
 */
function sweepBTC($jsonrpc, $addrA, $addrB, $fee = -1, $perkb = 10000, $minconf = 0) {
    $unspent = $jsonrpc->listunspent($minconf);
    $txinputs = array();
    $addrbalance = 0;
 
    foreach ($unspent as $value) {
        if ($value["address"] == $addrA) {
            $txinputs[] = array("txid" => $value["txid"],
                "vout" => $value["vout"]);
            $addrbalance += (int) round($value["amount"] * 1e8);
        }
    }
 
    if (count($txinputs) < 1) {
        return array("success" => false, "message" => "No unspent outputs available");
    }
 
// fee calculate by ($perkb * size in kb) following the formula at:
// http://bitcoin.stackexchange.com/questions/1195/how-to-calculate-transaction-size-before-sending
    if ($fee == -1)
        $fee = (int) max($perkb * floor((count($txinputs) * 148 + 44) / 1024), $perkb);
    else if ($fee < 0) {
        return array("succes" => false, "message" => "Fee must be non-negative");
    }
 
    $btcToSend = ($addrbalance - $fee);
    if ($btcToSend < 0) {
        return array("success" => false, "message" => "Not enough funds to cover fee");
    }
    $rawtx = $jsonrpc->createrawtransaction(
            $txinputs, array(
        $addrB => ($btcToSend / 1e8)));
 
    $signedtx = $jsonrpc->signrawtransaction($rawtx);
    if ($signedtx["Complete"] == 1) {
        $txid = $jsonrpc->sendrawtransaction($signedtx["hex"]);
    } else {
        return array("success" => false, "message" => "Oddly the transaction did not sign completely...");
    }
    return array("success" => true, "txid" => $txid);
}