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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\NSEC3; |
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use Badcow\DNS\Rdata\NSEC3PARAM; |
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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\RRSIG; |
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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 $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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NSEC3::TYPE, |
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NSEC3PARAM::TYPE, |
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RRSIG::TYPE, |
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]; |
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/** |
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* @var callable[] array of Rdata type indexed, callables that handle the output formatting of Rdata |
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*/ |
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private $rdataFormatters = []; |
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public function __construct() |
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{ |
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$this->rdataFormatters = AlignedRdataFormatters::$rdataFormatters; |
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} |
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/** |
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* Adds or changes an Rdata output formatter. |
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* |
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* @param string $type the Rdata type to be handled by the $formatter |
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* @param callable $formatter callable that will handle the output formatting of the Rdata |
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*/ |
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public function addRdataFormatter(string $type, callable $formatter): void |
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{ |
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$this->rdataFormatters[$type] = $formatter; |
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} |
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public function getRdataFormatters(): array |
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{ |
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return $this->rdataFormatters; |
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} |
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/** |
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* @return string[] |
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*/ |
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public function getOrder(): array |
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{ |
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return $this->order; |
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} |
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/** |
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* Set the order in which Resource Records should appear in a zone.. |
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* |
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* @param string[] $order Simple string array of Rdata types |
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*/ |
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public function setOrder(array $order): void |
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{ |
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$this->order = $order; |
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} |
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/** |
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* Build an aligned BIND zone file. |
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*/ |
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public function build(Zone $zone): string |
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{ |
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$master = self::generateControlEntries($zone); |
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$resourceRecords = $zone->getResourceRecords(); |
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$current = SOA::TYPE; |
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usort($resourceRecords, [__CLASS__, 'compareResourceRecords']); |
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list($namePadding, $ttlPadding, $typePadding, $classPadding, $rdataPadding) = self::getPadding($zone); |
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foreach ($resourceRecords as $resourceRecord) { |
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$rdata = $resourceRecord->getRdata(); |
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if (null == $rdata) { |
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continue; |
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} |
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if ($rdata->getType() !== $current) { |
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$master .= Tokens::LINE_FEED.Tokens::SEMICOLON.Tokens::SPACE.$rdata->getType().' RECORDS'.Tokens::LINE_FEED; |
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$current = $rdata->getType(); |
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} |
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$master .= sprintf('%s %s %s %s %s', |
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str_pad((string) $resourceRecord->getName(), $namePadding, Tokens::SPACE, STR_PAD_RIGHT), |
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str_pad((string) $resourceRecord->getTtl(), $ttlPadding, Tokens::SPACE, STR_PAD_RIGHT), |
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str_pad((string) $resourceRecord->getClass(), $classPadding, Tokens::SPACE, STR_PAD_RIGHT), |
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str_pad($rdata->getType(), $typePadding, Tokens::SPACE, STR_PAD_RIGHT), |
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$this->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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/** |
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* Returns the control entries as strings. |
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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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/** |
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* Returns a comment string if the comments are not null, returns empty string otherwise. |
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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 The first ResourceRecord |
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* @param ResourceRecord $b The second ResourceRecord |
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* |
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* @return int $a is higher precedence than $b if return value is less than 0. |
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* $b is higher precedence than $a if return value is greater than 0. |
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* $a and $b have the same precedence if the return value is 0. |
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*/ |
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public 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()) ? '' : $b->getRdata()->toText(); |
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//If the types are the same, do a simple alphabetical comparison. |
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if ($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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//Find the precedence (if any) for the two types. |
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$_a = array_search($a->getType(), $this->order); |
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$_b = array_search($b->getType(), $this->order); |
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//If neither types have defined precedence. |
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if (!is_int($_a) && !is_int($_b)) { |
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return strcmp($a->getType() ?? '', $b->getType() ?? ''); |
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} |
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//If both types have defined precedence. |
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if (is_int($_a) && is_int($_b)) { |
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return $_a - $_b; |
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} |
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//If only $b has defined precedence. |
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if (false === $_a) { |
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return 1; |
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} |
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//If only $a has defined precedence. |
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return -1; |
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} |
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/** |
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* Composes the RDATA of the Resource Record. |
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* |
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* @param RdataInterface $rdata the Rdata to be formatted |
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* @param int $padding the number of spaces before the Rdata column |
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*/ |
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private function generateRdataOutput(RdataInterface $rdata, int $padding): string |
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{ |
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if (array_key_exists($rdata->getType(), $this->rdataFormatters)) { |
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return call_user_func($this->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 the DNS Zone being processed |
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* |
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* @return int[] Array order: [name, ttl, type, class, 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 = $type = 0; |
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$class = 2; |
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/** @var ResourceRecord $resourceRecord */ |
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foreach ($zone as $resourceRecord) { |
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$name = max($name, strlen($resourceRecord->getName() ?? '')); |
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$ttl = max($ttl, strlen((string) $resourceRecord->getTtl())); |
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$class = max($class, strlen($resourceRecord->getClass() ?? '')); |
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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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$class, |
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$name + $ttl + $class + $type + 4, |
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]; |
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} |
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} |
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