PHP Bot

php_bot.php

<?php

$input = json_decode(file_get_contents("php://input"), true);
$source = $input["events"][0]["message"]["text"];

define("PHP_SIGN", "<?");
define("LLEVAL_ENDPOINT", "http://api.dan.co.jp/lleval.cgi");

if (0 === strpos($source, PHP_SIGN)) {
    echo prep($source);
    $resp = json_decode(file_get_contents(LLEVAL_ENDPOINT . "?s=" . urlencode(prep($source))), true);
    if (isset($resp["stderr"]) && "" !== $resp["stderr"]) {
        echo $resp["stderr"] . "\n";
    } else {
        echo $resp["stdout"] . "\n";
    }
}

function prep($source) {
    return "#!/usr/bin/php\n<?php " . trim(substr($source, strlen(PHP_SIGN))) . " ?>\n";
}