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Edit File : Resolver.php \| Size : 4.58 KB
<?php namespace React\Dns\Resolver; use React\Dns\Model\Message; use React\Dns\Query\ExecutorInterface; use React\Dns\Query\Query; use React\Dns\RecordNotFoundException; /** * @see ResolverInterface for the base interface / final class Resolver implements ResolverInterface { private $executor; public function __construct(ExecutorInterface $executor) { $this->executor = $executor; } public function resolve($domain) { return $this->resolveAll($domain, Message::TYPE_A)->then(function (array $ips) { return $ips[array_rand($ips)]; }); } public function resolveAll($domain, $type) { $query = new Query($domain, $type, Message::CLASS_IN); $that = $this; return $this->executor->query( $query )->then(function (Message $response) use ($query, $that) { return $that->extractValues($query, $response); }); } /* * [Internal] extract all resource record values from response for this query * * @param Query $query * @param Message $response * @return array * @throws RecordNotFoundException when response indicates an error or contains no data * @internal / public function extractValues(Query $query, Message $response) { // reject if response code indicates this is an error response message $code = $response->rcode; if ($code !== Message::RCODE_OK) { switch ($code) { case Message::RCODE_FORMAT_ERROR: $message = 'Format Error'; break; case Message::RCODE_SERVER_FAILURE: $message = 'Server Failure'; break; case Message::RCODE_NAME_ERROR: $message = 'Non-Existent Domain / NXDOMAIN'; break; case Message::RCODE_NOT_IMPLEMENTED: $message = 'Not Implemented'; break; case Message::RCODE_REFUSED: $message = 'Refused'; break; default: $message = 'Unknown error response code ' . $code; } throw new RecordNotFoundException( 'DNS query for ' . $query->describe() . ' returned an error response (' . $message . ')', $code ); } $answers = $response->answers; $addresses = $this->valuesByNameAndType($answers, $query->name, $query->type); // reject if we did not receive a valid answer (domain is valid, but no record for this type could be found) if (0 === count($addresses)) { throw new RecordNotFoundException( 'DNS query for ' . $query->describe() . ' did not return a valid answer (NOERROR / NODATA)' ); } return array_values($addresses); } /* * @param \React\Dns\Model\Record[] $answers * @param string $name * @param int $type * @return array */ private function valuesByNameAndType(array $answers, $name, $type) { // return all record values for this name and type (if any) $named = $this->filterByName($answers, $name); $records = $this->filterByType($named, $type); if ($records) { return $this->mapRecordData($records); } // no matching records found? check if there are any matching CNAMEs instead $cnameRecords = $this->filterByType($named, Message::TYPE_CNAME); if ($cnameRecords) { $cnames = $this->mapRecordData($cnameRecords); foreach ($cnames as $cname) { $records = array_merge( $records, $this->valuesByNameAndType($answers, $cname, $type) ); } } return $records; } private function filterByName(array $answers, $name) { return $this->filterByField($answers, 'name', $name); } private function filterByType(array $answers, $type) { return $this->filterByField($answers, 'type', $type); } private function filterByField(array $answers, $field, $value) { $value = strtolower($value); return array_filter($answers, function ($answer) use ($field, $value) { return $value === strtolower($answer->$field); }); } private function mapRecordData(array $records) { return array_map(function ($record) { return $record->data; }, $records); } } Back

Edit File : Resolver.php | Size : 4.58 KB

<?php

namespace React\Dns\Resolver;

use React\Dns\Model\Message;
use React\Dns\Query\ExecutorInterface;
use React\Dns\Query\Query;
use React\Dns\RecordNotFoundException;

/**
 * @see ResolverInterface for the base interface
 */
final class Resolver implements ResolverInterface
{
    private $executor;

public function __construct(ExecutorInterface $executor)
    {
        $this->executor = $executor;
    }

public function resolve($domain)
    {
        return $this->resolveAll($domain, Message::TYPE_A)->then(function (array $ips) {
            return $ips[array_rand($ips)];
        });
    }

public function resolveAll($domain, $type)
    {
        $query = new Query($domain, $type, Message::CLASS_IN);
        $that = $this;

return $this->executor->query(
            $query
        )->then(function (Message $response) use ($query, $that) {
            return $that->extractValues($query, $response);
        });
    }

/**
     * [Internal] extract all resource record values from response for this query
     *
     * @param Query   $query
     * @param Message $response
     * @return array
     * @throws RecordNotFoundException when response indicates an error or contains no data
     * @internal
     */
    public function extractValues(Query $query, Message $response)
    {
        // reject if response code indicates this is an error response message
        $code = $response->rcode;
        if ($code !== Message::RCODE_OK) {
            switch ($code) {
                case Message::RCODE_FORMAT_ERROR:
                    $message = 'Format Error';
                    break;
                case Message::RCODE_SERVER_FAILURE:
                    $message = 'Server Failure';
                    break;
                case Message::RCODE_NAME_ERROR:
                    $message = 'Non-Existent Domain / NXDOMAIN';
                    break;
                case Message::RCODE_NOT_IMPLEMENTED:
                    $message = 'Not Implemented';
                    break;
                case Message::RCODE_REFUSED:
                    $message = 'Refused';
                    break;
                default:
                    $message = 'Unknown error response code ' . $code;
            }
            throw new RecordNotFoundException(
                'DNS query for ' . $query->describe() . ' returned an error response (' . $message . ')',
                $code
            );
        }

$answers = $response->answers;
        $addresses = $this->valuesByNameAndType($answers, $query->name, $query->type);

// reject if we did not receive a valid answer (domain is valid, but no record for this type could be found)
        if (0 === count($addresses)) {
            throw new RecordNotFoundException(
                'DNS query for ' . $query->describe() . ' did not return a valid answer (NOERROR / NODATA)'
            );
        }

return array_values($addresses);
    }

/**
     * @param \React\Dns\Model\Record[] $answers
     * @param string                    $name
     * @param int                       $type
     * @return array
     */
    private function valuesByNameAndType(array $answers, $name, $type)
    {
        // return all record values for this name and type (if any)
        $named = $this->filterByName($answers, $name);
        $records = $this->filterByType($named, $type);
        if ($records) {
            return $this->mapRecordData($records);
        }

// no matching records found? check if there are any matching CNAMEs instead
        $cnameRecords = $this->filterByType($named, Message::TYPE_CNAME);
        if ($cnameRecords) {
            $cnames = $this->mapRecordData($cnameRecords);
            foreach ($cnames as $cname) {
                $records = array_merge(
                    $records,
                    $this->valuesByNameAndType($answers, $cname, $type)
                );
            }
        }

return $records;
    }

private function filterByName(array $answers, $name)
    {
        return $this->filterByField($answers, 'name', $name);
    }

private function filterByType(array $answers, $type)
    {
        return $this->filterByField($answers, 'type', $type);
    }

private function filterByField(array $answers, $field, $value)
    {
        $value = strtolower($value);
        return array_filter($answers, function ($answer) use ($field, $value) {
            return $value === strtolower($answer->$field);
        });
    }

private function mapRecordData(array $records)
    {
        return array_map(function ($record) {
            return $record->data;
        }, $records);
    }
}

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