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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of Badcow DNS Library. |
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* |
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* (c) Samuel Williams <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Badcow\DNS; |
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use Badcow\DNS\Parser\Tokens; |
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use Badcow\DNS\Rdata\A; |
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use Badcow\DNS\Rdata\AAAA; |
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use Badcow\DNS\Rdata\CNAME; |
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use Badcow\DNS\Rdata\DNAME; |
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use Badcow\DNS\Rdata\HINFO; |
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use Badcow\DNS\Rdata\LOC; |
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use Badcow\DNS\Rdata\MX; |
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use Badcow\DNS\Rdata\NS; |
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use Badcow\DNS\Rdata\PTR; |
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use Badcow\DNS\Rdata\RdataInterface; |
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use Badcow\DNS\Rdata\SOA; |
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use Badcow\DNS\Rdata\SRV; |
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use Badcow\DNS\Rdata\TXT; |
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class AlignedBuilder |
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{ |
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/** |
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* The order in which Resource Records should appear in a zone. |
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* |
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* @var array |
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*/ |
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private static $order = [ |
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SOA::TYPE, |
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NS::TYPE, |
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A::TYPE, |
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AAAA::TYPE, |
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CNAME::TYPE, |
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DNAME::TYPE, |
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MX::TYPE, |
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LOC::TYPE, |
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HINFO::TYPE, |
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TXT::TYPE, |
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PTR::TYPE, |
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SRV::TYPE, |
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]; |
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/** |
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* @param Zone $zone |
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* |
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* @return string |
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*/ |
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public static function build(Zone $zone): string |
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{ |
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3 |
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$master = self::generateControlEntries($zone); |
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3 |
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$resourceRecords = $zone->getResourceRecords(); |
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3 |
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$current = SOA::TYPE; |
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3 |
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usort($resourceRecords, [__CLASS__, 'compareResourceRecords']); |
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list($namePadding, $ttlPadding, $typePadding, $rdataPadding) = self::getPadding($zone); |
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foreach ($resourceRecords as $resourceRecord) { |
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$rdata = $resourceRecord->getRdata(); |
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if (null == $rdata) { |
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1 |
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continue; |
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} |
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if ($resourceRecord->getType() !== $current) { |
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$master .= Tokens::LINE_FEED.Tokens::SEMICOLON.Tokens::SPACE.$resourceRecord->getType().' RECORDS'.Tokens::LINE_FEED; |
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$current = $resourceRecord->getType(); |
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} |
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$master .= sprintf('%s %s %s %s %s', |
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str_pad((string) $resourceRecord->getName(), $namePadding, ' ', STR_PAD_RIGHT), |
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str_pad((string) $resourceRecord->getTtl(), $ttlPadding, ' ', STR_PAD_RIGHT), |
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str_pad((string) $resourceRecord->getClass(), 2, ' ', STR_PAD_RIGHT), |
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str_pad($rdata->getType(), $typePadding, ' ', STR_PAD_RIGHT), |
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self::generateRdataOutput($rdata, $rdataPadding) |
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); |
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$master .= self::generateComment($resourceRecord); |
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$master .= Tokens::LINE_FEED; |
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} |
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return $master; |
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} |
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private static function generateControlEntries(Zone $zone): string |
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{ |
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$master = '$ORIGIN '.$zone->getName().Tokens::LINE_FEED; |
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if (null !== $zone->getDefaultTtl()) { |
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$master .= '$TTL '.$zone->getDefaultTtl().Tokens::LINE_FEED; |
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} |
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return $master; |
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} |
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private static function generateComment(ResourceRecord $resourceRecord): string |
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{ |
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if (null !== $resourceRecord->getComment()) { |
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return Tokens::SEMICOLON.Tokens::SPACE.$resourceRecord->getComment(); |
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} |
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return ''; |
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} |
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/** |
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* Compares two ResourceRecords to determine which is the higher order. Used with the usort() function. |
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* |
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* @param ResourceRecord $a |
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* @param ResourceRecord $b |
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* |
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* @return int |
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*/ |
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public static function compareResourceRecords(ResourceRecord $a, ResourceRecord $b): int |
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{ |
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$a_rdata = (null === $a->getRdata()) ? '' : $a->getRdata()->toText(); |
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$b_rdata = (null === $b->getRdata()) ? '' : $b->getRdata()->toText(); |
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if ($a->getType() === $b->getType()) { |
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return strcmp($a->getName().$a_rdata, $b->getName().$b_rdata); |
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} |
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$_a = array_search($a->getType(), self::$order); |
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$_b = array_search($b->getType(), self::$order); |
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if (is_int($_a) && is_int($_b)) { |
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return $_a - $_b; |
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} |
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if (false === $_a) { |
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return 1; |
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} |
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return -1; |
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} |
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/** |
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* @param RdataInterface $rdata |
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* @param int $padding |
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* |
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* @return string |
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*/ |
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private static function generateRdataOutput(RdataInterface $rdata, int $padding): string |
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{ |
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$rdataFormatters = AlignedRdataFormatters::getRdataFormatters(); |
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if (array_key_exists($rdata->getType(), $rdataFormatters)) { |
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return call_user_func($rdataFormatters[$rdata->getType()], $rdata, $padding); |
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} |
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return $rdata->toText(); |
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} |
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/** |
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* Get the padding required for a zone. |
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* |
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* @param Zone $zone |
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* |
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* @return int[] Array order: name, ttl, type, rdata |
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*/ |
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private static function getPadding(Zone $zone): array |
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{ |
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$name = $ttl = $type = 0; |
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foreach ($zone as $resourceRecord) { |
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$name = max($name, strlen($resourceRecord->getName() ?? '')); |
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$ttl = max($ttl, strlen((string) $resourceRecord->getTtl())); |
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$type = max($type, strlen($resourceRecord->getType() ?? '')); |
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} |
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return [ |
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$name, |
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$ttl, |
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$type, |
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$name + $ttl + $type + 6, |
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]; |
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} |
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} |
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Badcow /
DNS
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