root/antispam/trunk/plugin/antispam.php

<?php

# Default configuration
$DEFAULT_ANTISPAM_CONFIG = Array(
    'program' => "python antispam.py %s", # --verbose --config=YOURCONFIG.conf
    'mail_to' => null, # => "your_mail@example.com"
    'email_min_score' => 0.0,
    'email_max_score' => 10.0,
    'mail_headers' => "Content-type: text/plain; charset=utf-8\r\n",
    'filename_prefix' => "spam-",
);

function antispam($message)
{
    global $DEFAULT_ANTISPAM_CONFIG, $ANTISPAM_CONFIG;
    $config = array_merge($DEFAULT_ANTISPAM_CONFIG, $ANTISPAM_CONFIG);

    // Create filename
    do {
        $filename = uniqid(null, true);
        $filename = $config['filename_prefix'].$filename.'.txt';
    } while (file_exists($filename));

    // Write message to temporary file
    $file = fopen($filename, "w");
    if (!$file) {
        die("ANTISPAM FATAL ERROR: Unable to create file $filename!");
    }
    fwrite($file, $message);
    fclose($file);

    // Run antispam program
    $command = sprintf($config['program'], escapeshellarg($filename));
    ob_start();
    passthru($command, $exitcode);
    $output = ob_get_contents();
    ob_end_clean();

    // Remove temporary file
    unlink($filename);

    // Read output to check if it's a spam
    if (ereg("score: ([+-][0-9]+\.[0-9]{2})", $output, $regs)) {
        $score = $regs[1];
        $score = (float)$score;
        $is_spam = (0 < $score);
        $send_email = (($config['email_min_score'] <= $score) and ($score <= $config['email_max_score']));
    } else {
        $score = null;
        $is_spam = ($exitcode == 2) or (strpos($output, "***SPAM***") !== false);
        $send_email = true;
    }

    if (!$config['mail_to']) {
        # Email address not configured!
        $send_email = false;
    }

    if ($send_email) {
        // Email subject
        if ($is_spam) {
            $subject = "Antispam result: SPAM!";
        } else {
            $subject = "Antispam result: ok";
        }
        if (!is_null($score)) {
            $subject .= sprintf(" (score: %+.2f)", $score);
        } else {
            $subject .= " (error: unable to parse score!)";
        }

        // Email content
        $email  = "$command\n";
        $email .= "Timestamp: ".date('l dS F Y h:i:s A')."\n";
        $email .= "Exit code: ".(int)$exitcode."\n";
        $email .= sprintf("Score: min=%.1f <= %.1f <= max=%.1f\n",
                $config['email_min_score'],
                $score,
                $config['email_max_score']);
        $email .= "\n";
        $email .= "$output";
        $email .= str_repeat("-", 70)."\n";
        $email .= $message;

        // Send email
        mail($config['mail_to'], $subject, $email, $config['mail_headers']);
    }

    // Return result
    return $is_spam;
}

?>