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BookStack/app/Actions/IpFormatter.php

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<?php
namespace BookStack\Actions;
class IpFormatter
{
protected string $ip;
protected int $precision;
public function __construct(string $ip, int $precision)
{
$this->ip = trim($ip);
$this->precision = max(0, min($precision, 4));
}
public function format(): string
{
if (empty($this->ip) || $this->precision === 4) {
return $this->ip;
}
return $this->isIpv6() ? $this->maskIpv6() : $this->maskIpv4();
}
protected function maskIpv4(): string
{
$exploded = $this->explodeAndExpandIp('.', 4);
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$maskGroupCount = min(4 - $this->precision, count($exploded));
for ($i = 0; $i < $maskGroupCount; $i++) {
$exploded[3 - $i] = 'x';
}
return implode('.', $exploded);
}
protected function maskIpv6(): string
{
$exploded = $this->explodeAndExpandIp(':', 8);
$maskGroupCount = min(8 - ($this->precision * 2), count($exploded));
for ($i = 0; $i < $maskGroupCount; $i++) {
$exploded[7 - $i] = 'x';
}
return implode(':', $exploded);
}
protected function isIpv6(): bool
{
return strpos($this->ip, ':') !== false;
}
protected function explodeAndExpandIp(string $separator, int $targetLength): array
{
$exploded = explode($separator, $this->ip);
while (count($exploded) < $targetLength) {
$emptyIndex = array_search('', $exploded) ?: count($exploded) - 1;
array_splice($exploded, $emptyIndex, 0, '0');
}
$emptyIndex = array_search('', $exploded);
if ($emptyIndex !== false) {
$exploded[$emptyIndex] = '0';
}
return $exploded;
}
public static function fromCurrentRequest(): self
{
$ip = request()->ip() ?? '';
if (config('app.env') === 'demo') {
$ip = '127.0.0.1';
}
return new self($ip, config('app.ip_address_precision'));
}
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}