iprange-to-iptables.php

<?php

$name = 'POWERBI-AZURE';
$label = 'Allow Power BI Azure';
$port = '3306';

$ipAddresses = array_map('rtrim', file('ipaddresses'));
$maxIpLength = max(array_map('strlen', $ipAddresses));

$output = "    iptables_rules_v4:\n";
foreach ($ipAddresses as $index => $ip) {
    $pattern = "{$name}-" . str_pad($index + 1, 3, "0", STR_PAD_LEFT);

    $padding = str_repeat(" ", $maxIpLength - strlen($ip));

    $rule = "-A INPUT -s {$ip}{$padding} -p tcp -m multiport --dports {$port} -m comment --comment \"{$label} " . str_pad($index + 1, 3, "0", STR_PAD_LEFT) . "\" -j ACCEPT";
    
    $output .= "      - pattern: \"$pattern\"\n";
    $output .= "        rule: $rule\n";
}

echo $output;