DohMiddleware::resolve() - Code Metrics - Inspection of "refactoring" - Ne-Lexa/guzzle-doh-middleware - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — develop (033cda)

by Alexey

created 2022-03-04 08:01 UTC

DohMiddleware::resolve() A

↳ Parent: DohMiddleware

Complexity

Conditions	2
Paths	2

Size

Total Lines	16
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	3.1852

Importance

Changes

Metric	Value
cc	2
eloc	8
c	0
b	0
f	0
nc	2
nop	2
dl	0
loc	16
ccs	2
cts	6
cp	0.3333
crap	3.1852
rs	10

<?php

declare(strict_types=1);

/*
 * Copyright (c) Ne-Lexa
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 *
 * @see https://github.com/Ne-Lexa/guzzle-doh-middleware
 */

namespace Nelexa\Doh;

use GuzzleHttp\Exception\GuzzleException;
use GuzzleHttp\Promise\PromiseInterface;
use Nelexa\Doh\Storage\DnsRecord;
use Nelexa\Doh\Storage\StorageFactory;
use Nelexa\Doh\Storage\StorageInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;

class DohMiddleware
{
    public const OPTION_DOH_ENABLED = 'doh';

    public const OPTION_DOH_TTL = 'doh_ttl';

    public const OPTION_DOH_SHUFFLE = 'doh_shuffle';

    public const HEADER_RESPONSE_RESOLVED_IPS = 'X-DoH-Ips';

    public const HEADER_RESPONSE_CACHE_HIT = 'X-DoH-Cache-Hit';

    public const HEADER_RESPONSE_CACHE_TTL = 'X-DoH-Cache-TTL';

    private const DEFAULT_OPTIONS = [
        self::OPTION_DOH_ENABLED => true,
        self::OPTION_DOH_TTL => null,
        self::OPTION_DOH_SHUFFLE => false,
    ];

    /** @var \Closure(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface */
    private $nextHandler;

    /** @var \Nelexa\Doh\DomainResolver */
    private $domainResolver;

    /** @var \Psr\Log\LoggerInterface */
    private $logger;

    /**
     * @psalm-param \Closure(\Psr\Http\Message\RequestInterface, array $options): \GuzzleHttp\Promise\PromiseInterface $nextHandler
     *
     * @param \Closure                             $nextHandler
     * @param \Nelexa\Doh\Storage\StorageInterface $storage
     * @param string[]                             $dohServers
     * @param \Psr\Log\LoggerInterface             $logger
     * @param bool                                 $debug
     */
    private function __construct(
        \Closure $nextHandler,
        StorageInterface $storage,
        array $dohServers,
        LoggerInterface $logger,
        bool $debug = false
    ) {
        $this->nextHandler = $nextHandler;
        $this->domainResolver = new DomainResolver($storage, $dohServers, $debug);
        $this->logger = $logger;
    }

    /**
     * @param RequestInterface $request
     * @param array            $options
     *
     * @return PromiseInterface
     */
    public function __invoke(RequestInterface $request, array $options): PromiseInterface
    {
        $options += self::DEFAULT_OPTIONS;
        $domainName = $request->getUri()->getHost();

        if (
            !\function_exists('curl_init')
            || $options[self::OPTION_DOH_ENABLED] === false
            || $this->isIpOrLocalDomainName($domainName)
        ) {
            return ($this->nextHandler)($request, $options);
        }

        $dnsRecord = $this->resolve($domainName, $options);

        if ($dnsRecord !== null && $dnsRecord->count() > 0) {
            return $this->appendDnsRecord($request, $options, $dnsRecord);
        }

        $this->logger->warning(sprintf('DoH client could not resolve ip addresses for %s domain', $domainName));

        return ($this->nextHandler)($request, $options);
    }

    /**
     * @param \Psr\SimpleCache\CacheInterface|\Psr\Cache\CacheItemPoolInterface|StorageInterface|null $cache
     * @param string[]                                                                                $dohServers
     * @param \Psr\Log\LoggerInterface|null                                                           $logger
     * @param bool                                                                                    $debug
     *
     * @return callable
     */
    public static function create(
        $cache = null,
        array $dohServers = [],
        ?LoggerInterface $logger = null,
        bool $debug = false
    ): callable {
        $storage = StorageFactory::create($cache);

        return static function (\Closure $handler) use ($storage, $dohServers, $logger, $debug) {
            /** @psalm-var \Closure(\Psr\Http\Message\RequestInterface, array $options): \GuzzleHttp\Promise\PromiseInterface $handler */
            return new self($handler, $storage, $dohServers, $logger ?? new NullLogger(), $debug);
        };
    }

    private function resolve(string $domainName, array $options): ?DnsRecord
    {
        /** @psalm-suppress InvalidCatch */
        try {
            return $this->domainResolver->resolveDomain($domainName, $options);
        } catch (GuzzleException $e) {
            $this->logger->error(
                sprintf('[DoH] Error resolving %s domain', $domainName),
                [
                    'domain' => $domainName,
                    'exception' => $e,
                ]
            );
        }

        return null;
    }

    private function appendDnsRecord(RequestInterface $request, array $options, DnsRecord $dnsRecord): PromiseInterface
    {
        /** @var array<int, mixed> $curlOptions */
        $curlOptions = [
            \CURLOPT_DNS_USE_GLOBAL_CACHE => false, // disable global cache
        ];

        $ipAddresses = $dnsRecord->getData();

        if ($options[self::OPTION_DOH_SHUFFLE]) {
            if ($this->isSupportShuffleIps()) {
                /**
                 * @noinspection PhpElementIsNotAvailableInCurrentPhpVersionInspection
                 * @psalm-suppress UndefinedConstant
                 */
                $curlOptions[\CURLOPT_DNS_SHUFFLE_ADDRESSES] = true;
            } else {
                shuffle($ipAddresses);
            }
        }

        if (!$this->isSupportMultipleIps()) {
            $ipAddresses = \array_slice($ipAddresses, 0, 1);
        }

        $domainName = $dnsRecord->getDomainName();
        $ipAddressesString = implode(',', $ipAddresses);
        $curlOptions[\CURLOPT_RESOLVE] = [
            $domainName . ':80:' . $ipAddressesString,
            $domainName . ':443:' . $ipAddressesString,
        ];

        $port = $request->getUri()->getPort();

        if ($port !== null && $port !== 80 && $port !== 443) {
            $curlOptions[\CURLOPT_RESOLVE][] = $domainName . ':' . $port . ':' . $ipAddressesString;
        }

        $this->logger->debug(sprintf('[DoH] Set ip addresses %s for domain %s', $ipAddressesString, $domainName));

        $options['curl'] = $curlOptions;

        return ($this->nextHandler)($request, $options)->then(
            static function (ResponseInterface $response) use ($ipAddressesString, $dnsRecord) {
                if ($dnsRecord->cacheHit) {
                    $cacheTtl = max(0, $dnsRecord->getExpiredAt()->getTimestamp() - time());
                    $response = $response->withHeader(self::HEADER_RESPONSE_CACHE_TTL, (string) $cacheTtl);
                }

                return $response
                    ->withHeader(self::HEADER_RESPONSE_CACHE_HIT, var_export($dnsRecord->cacheHit, true))
                    ->withHeader(self::HEADER_RESPONSE_RESOLVED_IPS, $ipAddressesString)
                ;
            }
        );
    }

    /**
     * @see https://curl.haxx.se/libcurl/c/CURLOPT_RESOLVE.html Support for providing multiple IP
     *                                                          addresses per entry was added in 7.59.0.
     *
     * @return bool
     */
    private function isSupportMultipleIps(): bool
    {
        return version_compare((string) curl_version()['version'], '7.59.0', '>=');

    }

    private function isSupportShuffleIps(): bool
    {
        return \PHP_VERSION_ID >= 70300
            && version_compare(
                (string) curl_version()['version'],
                '7.60.0',
                '>='
            );
    }

    private function isIpOrLocalDomainName(string $domainName): bool
    {
        return filter_var($domainName, \FILTER_VALIDATE_IP)
            || strcasecmp($domainName, 'localhost') === 0;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		/*
6		* Copyright (c) Ne-Lexa
7		*
8		* For the full copyright and license information, please view
9		* the LICENSE file that was distributed with this source code.
10		*
11		* @see https://github.com/Ne-Lexa/guzzle-doh-middleware
12		*/
13
14		namespace Nelexa\Doh;
15
16		use GuzzleHttp\Exception\GuzzleException;
17		use GuzzleHttp\Promise\PromiseInterface;
18		use Nelexa\Doh\Storage\DnsRecord;
19		use Nelexa\Doh\Storage\StorageFactory;
20		use Nelexa\Doh\Storage\StorageInterface;
21		use Psr\Http\Message\RequestInterface;
22		use Psr\Http\Message\ResponseInterface;
23		use Psr\Log\LoggerInterface;
24		use Psr\Log\NullLogger;
25
26		class DohMiddleware
27		{
28		public const OPTION_DOH_ENABLED = 'doh';
29
30		public const OPTION_DOH_TTL = 'doh_ttl';
31
32		public const OPTION_DOH_SHUFFLE = 'doh_shuffle';
33
34		public const HEADER_RESPONSE_RESOLVED_IPS = 'X-DoH-Ips';
35
36		public const HEADER_RESPONSE_CACHE_HIT = 'X-DoH-Cache-Hit';
37
38		public const HEADER_RESPONSE_CACHE_TTL = 'X-DoH-Cache-TTL';
39
40		private const DEFAULT_OPTIONS = [
41		self::OPTION_DOH_ENABLED => true,
42		self::OPTION_DOH_TTL => null,
43		self::OPTION_DOH_SHUFFLE => false,
44		];
45
46		/** @var \Closure(\Psr\Http\Message\RequestInterface, array): \GuzzleHttp\Promise\PromiseInterface */
47		private $nextHandler;
48
49		/** @var \Nelexa\Doh\DomainResolver */
50		private $domainResolver;
51
52		/** @var \Psr\Log\LoggerInterface */
53		private $logger;
54
55		/**
56		* @psalm-param \Closure(\Psr\Http\Message\RequestInterface, array $options): \GuzzleHttp\Promise\PromiseInterface $nextHandler
57		*
58		* @param \Closure $nextHandler
59		* @param \Nelexa\Doh\Storage\StorageInterface $storage
60		* @param string[] $dohServers
61		* @param \Psr\Log\LoggerInterface $logger
62		* @param bool $debug
63		*/
64	14	private function __construct(
65		\Closure $nextHandler,
66		StorageInterface $storage,
67		array $dohServers,
68		LoggerInterface $logger,
69		bool $debug = false
70		) {
71	14	$this->nextHandler = $nextHandler;
72	14	$this->domainResolver = new DomainResolver($storage, $dohServers, $debug);
73	14	$this->logger = $logger;
74		}
75
76		/**
77		* @param RequestInterface $request
78		* @param array $options
79		*
80		* @return PromiseInterface
81		*/
82	14	public function __invoke(RequestInterface $request, array $options): PromiseInterface
83		{
84	14	$options += self::DEFAULT_OPTIONS;
85	14	$domainName = $request->getUri()->getHost();
86
87		if (
88	14	!\function_exists('curl_init')
89	14	\|\| $options[self::OPTION_DOH_ENABLED] === false
90	14	\|\| $this->isIpOrLocalDomainName($domainName)
91		) {
92	1	return ($this->nextHandler)($request, $options);
93		}
94
95	13	$dnsRecord = $this->resolve($domainName, $options);
96
97	13	if ($dnsRecord !== null && $dnsRecord->count() > 0) {
98	13	return $this->appendDnsRecord($request, $options, $dnsRecord);
99		}
100
101		$this->logger->warning(sprintf('DoH client could not resolve ip addresses for %s domain', $domainName));
102
103		return ($this->nextHandler)($request, $options);
104		}
105
106		/**
107		* @param \Psr\SimpleCache\CacheInterface\|\Psr\Cache\CacheItemPoolInterface\|StorageInterface\|null $cache
108		* @param string[] $dohServers
109		* @param \Psr\Log\LoggerInterface\|null $logger
110		* @param bool $debug
111		*
112		* @return callable
113		*/
114	14	public static function create(
115		$cache = null,
116		array $dohServers = [],
117		?LoggerInterface $logger = null,
118		bool $debug = false
119		): callable {
120	14	$storage = StorageFactory::create($cache);
121
122	14	return static function (\Closure $handler) use ($storage, $dohServers, $logger, $debug) {
123		/** @psalm-var \Closure(\Psr\Http\Message\RequestInterface, array $options): \GuzzleHttp\Promise\PromiseInterface $handler */
124	14	return new self($handler, $storage, $dohServers, $logger ?? new NullLogger(), $debug);
125		};
126		}
127
128	13	private function resolve(string $domainName, array $options): ?DnsRecord
129		{
130		/** @psalm-suppress InvalidCatch */
131		try {
132	13	return $this->domainResolver->resolveDomain($domainName, $options);
133		} catch (GuzzleException $e) {
134		$this->logger->error(
135		sprintf('[DoH] Error resolving %s domain', $domainName),
136		[
137		'domain' => $domainName,
138		'exception' => $e,
139		]
140		);
141		}
142
143		return null;
144		}
145
146	13	private function appendDnsRecord(RequestInterface $request, array $options, DnsRecord $dnsRecord): PromiseInterface
147		{
148		/** @var array<int, mixed> $curlOptions */
149		$curlOptions = [
150		\CURLOPT_DNS_USE_GLOBAL_CACHE => false, // disable global cache
151		];
152
153	13	$ipAddresses = $dnsRecord->getData();
154
155	13	if ($options[self::OPTION_DOH_SHUFFLE]) {
156		if ($this->isSupportShuffleIps()) {
157		/**
158		* @noinspection PhpElementIsNotAvailableInCurrentPhpVersionInspection
159		* @psalm-suppress UndefinedConstant
160		*/
161		$curlOptions[\CURLOPT_DNS_SHUFFLE_ADDRESSES] = true;
162		} else {
163		shuffle($ipAddresses);
164		}
165		}
166
167	13	if (!$this->isSupportMultipleIps()) {
168	13	$ipAddresses = \array_slice($ipAddresses, 0, 1);
169		}
170
171	13	$domainName = $dnsRecord->getDomainName();
172	13	$ipAddressesString = implode(',', $ipAddresses);
173	13	$curlOptions[\CURLOPT_RESOLVE] = [
174	13	$domainName . ':80:' . $ipAddressesString,
175	13	$domainName . ':443:' . $ipAddressesString,
176		];
177
178	13	$port = $request->getUri()->getPort();
179
180	13	if ($port !== null && $port !== 80 && $port !== 443) {
181		$curlOptions[\CURLOPT_RESOLVE][] = $domainName . ':' . $port . ':' . $ipAddressesString;
182		}
183
184	13	$this->logger->debug(sprintf('[DoH] Set ip addresses %s for domain %s', $ipAddressesString, $domainName));
185
186	13	$options['curl'] = $curlOptions;
187
188	13	return ($this->nextHandler)($request, $options)->then(
189	13	static function (ResponseInterface $response) use ($ipAddressesString, $dnsRecord) {
190	13	if ($dnsRecord->cacheHit) {
191	3	$cacheTtl = max(0, $dnsRecord->getExpiredAt()->getTimestamp() - time());
192	3	$response = $response->withHeader(self::HEADER_RESPONSE_CACHE_TTL, (string) $cacheTtl);
193		}
194
195		return $response
196	13	->withHeader(self::HEADER_RESPONSE_CACHE_HIT, var_export($dnsRecord->cacheHit, true))
197	13	->withHeader(self::HEADER_RESPONSE_RESOLVED_IPS, $ipAddressesString)
198		;
199		}
200		);
201		}
202
203		/**
204		* @see https://curl.haxx.se/libcurl/c/CURLOPT_RESOLVE.html Support for providing multiple IP
205		* addresses per entry was added in 7.59.0.
206		*
207		* @return bool
208		*/
209	13	private function isSupportMultipleIps(): bool
210		{
211	13	return version_compare((string) curl_version()['version'], '7.59.0', '>=');
		0 ignored issues – show Bug Best Practice introduced 2022-03-03 19:49 UTC by Report Bug Copy Issue Report The expression `return version_compare((...sion'], '7.59.0', '>=')` could return the type `integer` which is incompatible with the type-hinted return `boolean`. Consider adding an additional type-check to rule them out. Loading history...
212		}
213
214		private function isSupportShuffleIps(): bool
215		{
216		return \PHP_VERSION_ID >= 70300
217		&& version_compare(
218		(string) curl_version()['version'],
219		'7.60.0',
220		'>='
221		);
222		}
223
224	13	private function isIpOrLocalDomainName(string $domainName): bool
225		{
226	13	return filter_var($domainName, \FILTER_VALIDATE_IP)
227	13	\|\| strcasecmp($domainName, 'localhost') === 0;
228		}
229		}
230

Ne-Lexa / guzzle-doh-middleware

Branch — develop (033cda)

DohMiddleware::resolve() A

Complexity

Size

Duplication

Code Coverage

Importance

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