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<?php |
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namespace Badcow\DNS\Parser; |
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use Badcow\DNS\Rdata; |
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class RdataHandlers |
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{ |
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private static $handlers = [ |
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Rdata\LOC::TYPE => __CLASS__.'::handleLocRdata', |
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Rdata\TXT::TYPE => __CLASS__.'::handleTxtRdata', |
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Rdata\APL::TYPE => __CLASS__.'::handleAplRdata', |
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]; |
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public static function getHandlers(): array |
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{ |
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return static::$handlers; |
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} |
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/** |
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* Transform a DMS string to a decimal representation. Used for LOC records. |
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* |
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* @param int $deg Degrees |
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* @param int $min Minutes |
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* @param float $sec Seconds |
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* @param string $hemisphere Either 'N', 'S', 'E', or 'W' |
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* |
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* @return float |
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*/ |
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public static function dmsToDecimal(int $deg, int $min, float $sec, string $hemisphere): float |
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{ |
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$multiplier = ('S' === $hemisphere || 'W' === $hemisphere) ? -1 : 1; |
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return $multiplier * ($deg + ($min / 60) + ($sec / 3600)); |
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} |
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/** |
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* @param \ArrayIterator $iterator |
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* |
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* @return Rdata\LOC |
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*/ |
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public static function handleLocRdata(\ArrayIterator $iterator): Rdata\LOC |
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{ |
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$lat = self::dmsToDecimal((int) self::pop($iterator), (int) self::pop($iterator), (float) self::pop($iterator), self::pop($iterator)); |
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$lon = self::dmsToDecimal((int) self::pop($iterator), (int) self::pop($iterator), (float) self::pop($iterator), self::pop($iterator)); |
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return Rdata\Factory::Loc( |
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$lat, |
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$lon, |
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(float) self::pop($iterator), |
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(float) self::pop($iterator), |
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(float) self::pop($iterator), |
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(float) self::pop($iterator) |
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); |
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} |
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/** |
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* @param \ArrayIterator $iterator |
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* |
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* @return Rdata\APL |
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* |
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* @throws ParseException |
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*/ |
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public static function handleAplRdata(\ArrayIterator $iterator): Rdata\APL |
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{ |
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$rdata = new Rdata\APL(); |
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while ($iterator->valid()) { |
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$matches = []; |
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if (1 !== preg_match('/^(?<negate>!)?[1-2]:(?<block>.+)$/i', $iterator->current(), $matches)) { |
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throw new ParseException(sprintf('"%s" is not a valid IP range.', $iterator->current())); |
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} |
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$ipBlock = \IPBlock::create($matches['block']); |
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$rdata->addAddressRange($ipBlock, '!' !== $matches['negate']); |
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$iterator->next(); |
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} |
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return $rdata; |
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} |
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/** |
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* @param \ArrayIterator $iterator |
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* |
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* @return Rdata\TXT |
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*/ |
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public static function handleTxtRdata(\ArrayIterator $iterator): Rdata\TXT |
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{ |
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$string = new StringIterator(implode(Tokens::SPACE, self::getAllRemaining($iterator))); |
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$txt = new StringIterator(); |
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while ($string->valid()) { |
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self::handleTxt($string, $txt); |
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$string->next(); |
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} |
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return Rdata\Factory::txt((string) $txt); |
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} |
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public static function catchAll(string $type, \ArrayIterator $iterator): Rdata\RdataInterface |
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{ |
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if (!Rdata\Factory::isTypeImplemented($type)) { |
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return new PolymorphicRdata($type, implode(Tokens::SPACE, self::getAllRemaining($iterator))); |
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} |
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return call_user_func_array([Rdata\Factory::class, $type], self::getAllRemaining($iterator)); |
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} |
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/** |
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* @param StringIterator $string |
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* @param StringIterator $txt |
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*/ |
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private static function handleTxt(StringIterator $string, StringIterator $txt): void |
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{ |
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if ($string->isNot(Tokens::DOUBLE_QUOTES)) { |
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return; |
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} |
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$string->next(); |
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while ($string->isNot(Tokens::DOUBLE_QUOTES) && $string->valid()) { |
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if ($string->is(Tokens::BACKSLASH)) { |
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$string->next(); |
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} |
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$txt->append($string->current()); |
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$string->next(); |
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} |
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} |
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/** |
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* Return current entry and moves the iterator to the next entry. |
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* |
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* @param \ArrayIterator $iterator |
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* |
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* @return string |
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*/ |
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private static function pop(\ArrayIterator $iterator): string |
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{ |
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$current = $iterator->current(); |
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$iterator->next(); |
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return $current; |
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} |
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/** |
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* Get all the remaining values of an iterator as an array. |
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* |
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* @param \ArrayIterator $iterator |
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* |
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* @return array |
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*/ |
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private static function getAllRemaining(\ArrayIterator $iterator): array |
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{ |
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$values = []; |
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while ($iterator->valid()) { |
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$values[] = $iterator->current(); |
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$iterator->next(); |
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} |
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return $values; |
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} |
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} |
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