CachePlugin::createCacheKey() - Code Metrics - Inspection of "Implement caching types" - php-http/cache-plugin - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#26)

by Jeroen

created 2017-02-27 08:46 UTC

CachePlugin::createCacheKey() A

↳ Parent: CachePlugin

Complexity

Conditions	2
Paths	2

Size

Total Lines	9
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	9
ccs	6
cts	6
cp	1
rs	9.6666
c	0
b	0
f	0
cc	2
eloc	5
nc	2
nop	1
crap	2

<?php

namespace Http\Client\Common\Plugin;

use Http\Client\Common\Plugin;
use Http\Message\StreamFactory;
use Http\Promise\FulfilledPromise;
use Psr\Cache\CacheItemInterface;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Symfony\Component\OptionsResolver\Options;
use Symfony\Component\OptionsResolver\OptionsResolver;

/**
 * Allow for caching a response.
 *
 * @author Tobias Nyholm <[email protected]>
 */
final class CachePlugin implements Plugin
{
    /**
     * @var CacheItemPoolInterface
     */
    private $pool;

    /**
     * @var StreamFactory
     */
    private $streamFactory;

    /**
     * @var array
     */
    private $config;

    /**
     * Cache directives indicating if a response can not be cached.
     *
     * @var array
     */
    private $noCacheFlags = ['no-cache', 'private', 'no-store'];

    /**
     * @param CacheItemPoolInterface $pool
     * @param StreamFactory          $streamFactory
     * @param array                  $config        {
     *
     *     @var bool $respect_cache_headers Whether to look at the cache directives or ignore them
     *     @var int $default_ttl (seconds) If we do not respect cache headers or can't calculate a good ttl, use this
     *              value
     *     @var string $hash_algo The hashing algorithm to use when generating cache keys
     *     @var int $cache_lifetime (seconds) To support serving a previous stale response when the server answers 304
     *              we have to store the cache for a longer time than the server originally says it is valid for.
     *              We store a cache item for $cache_lifetime + max age of the response.
     *     @var array $methods list of request methods which can be cached
     *     @var array $respect_response_cache_directives list of cache directives this plugin will respect while caching responses.
     * }
     */
    public function __construct(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        $this->pool = $pool;
        $this->streamFactory = $streamFactory;

        if (isset($config['respect_cache_headers']) && isset($config['respect_response_cache_directives'])) {
            throw new \InvalidArgumentException(
                'You can\'t provide config option "respect_cache_headers" and "respect_response_cache_directives". '.
                'Use "respect_response_cache_directives" instead.'
            );
        }

        $optionsResolver = new OptionsResolver();
        $this->configureOptions($optionsResolver);
        $this->config = $optionsResolver->resolve($config);
    }

    /**
     * This method will setup the cachePlugin in client cache mode. When using the client cache mode the plugin will
     * cache responses with `private` cache directive.
     *
     * @param CacheItemPoolInterface $pool
     * @param StreamFactory          $streamFactory
     * @param array                  $config        For all possible config options see the constructor docs
     *
     * @return CachePlugin
     */
    public static function clientCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        // Allow caching of private requests
        if (isset($config['respect_response_cache_directives'])) {
            $config['respect_response_cache_directives'][] = 'no-cache';
            $config['respect_response_cache_directives'][] = 'max-age';
            $config['respect_response_cache_directives'] = array_unique($config['respect_response_cache_directives']);
        } else {
            $config['respect_response_cache_directives'] = ['no-cache', 'max-age'];
        }

        return new self($pool, $streamFactory, $config);
    }

    /**
     * This method will setup the cachePlugin in server cache mode. This is the default caching behavior it refuses to
     * cache responses with the `private`or `no-cache` directives.
     *
     * @param CacheItemPoolInterface $pool
     * @param StreamFactory          $streamFactory
     * @param array                  $config        For all possible config options see the constructor docs
     *
     * @return CachePlugin
     */
    public static function serverCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        return new self($pool, $streamFactory, $config);
    }

    /**
     * {@inheritdoc}
     */
    public function handleRequest(RequestInterface $request, callable $next, callable $first)
    {
        $method = strtoupper($request->getMethod());
        // if the request not is cachable, move to $next
        if (!in_array($method, $this->config['methods'])) {
            return $next($request);
        }

        // If we can cache the request
        $key = $this->createCacheKey($request);
        $cacheItem = $this->pool->getItem($key);

        if ($cacheItem->isHit()) {
            $data = $cacheItem->get();
            // The array_key_exists() is to be removed in 2.0.
            if (array_key_exists('expiresAt', $data) && ($data['expiresAt'] === null || time() < $data['expiresAt'])) {
                // This item is still valid according to previous cache headers
                return new FulfilledPromise($this->createResponseFromCacheItem($cacheItem));
            }

            // Add headers to ask the server if this cache is still valid
            if ($modifiedSinceValue = $this->getModifiedSinceHeaderValue($cacheItem)) {
                $request = $request->withHeader('If-Modified-Since', $modifiedSinceValue);
            }

            if ($etag = $this->getETag($cacheItem)) {
                $request = $request->withHeader('If-None-Match', $etag);
            }
        }

        return $next($request)->then(function (ResponseInterface $response) use ($cacheItem) {
            if (304 === $response->getStatusCode()) {
                if (!$cacheItem->isHit()) {
                    /*
                     * We do not have the item in cache. This plugin did not add If-Modified-Since
                     * or If-None-Match headers. Return the response from server.
                     */
                    return $response;
                }

                // The cached response we have is still valid
                $data = $cacheItem->get();
                $maxAge = $this->getMaxAge($response);
                $data['expiresAt'] = $this->calculateResponseExpiresAt($maxAge);
                $cacheItem->set($data)->expiresAfter($this->calculateCacheItemExpiresAfter($maxAge));
                $this->pool->save($cacheItem);

                return $this->createResponseFromCacheItem($cacheItem);
            }

            if ($this->isCacheable($response)) {
                $bodyStream = $response->getBody();
                $body = $bodyStream->__toString();
                if ($bodyStream->isSeekable()) {
                    $bodyStream->rewind();
                } else {
                    $response = $response->withBody($this->streamFactory->createStream($body));
                }

                $maxAge = $this->getMaxAge($response);
                $cacheItem
                    ->expiresAfter($this->calculateCacheItemExpiresAfter($maxAge))
                    ->set([
                        'response' => $response,
                        'body' => $body,
                        'expiresAt' => $this->calculateResponseExpiresAt($maxAge),
                        'createdAt' => time(),
                        'etag' => $response->getHeader('ETag'),
                    ]);
                $this->pool->save($cacheItem);
            }

            return $response;
        });
    }

    /**
     * Calculate the timestamp when this cache item should be dropped from the cache. The lowest value that can be
     * returned is $maxAge.
     *
     * @param int|null $maxAge
     *
     * @return int|null Unix system time passed to the PSR-6 cache
     */
    private function calculateCacheItemExpiresAfter($maxAge)
    {
        if ($this->config['cache_lifetime'] === null && $maxAge === null) {
            return;
        }

        return $this->config['cache_lifetime'] + $maxAge;
    }

    /**
     * Calculate the timestamp when a response expires. After that timestamp, we need to send a
     * If-Modified-Since / If-None-Match request to validate the response.
     *
     * @param int|null $maxAge
     *
     * @return int|null Unix system time. A null value means that the response expires when the cache item expires
     */
    private function calculateResponseExpiresAt($maxAge)
    {
        if ($maxAge === null) {
            return;
        }

        return time() + $maxAge;
    }

    /**
     * Verify that we can cache this response.
     *
     * @param ResponseInterface $response
     *
     * @return bool
     */
    protected function isCacheable(ResponseInterface $response)
    {
        if (!in_array($response->getStatusCode(), [200, 203, 300, 301, 302, 404, 410])) {
            return false;
        }

        $nocacheDirectives = array_intersect($this->config['respect_response_cache_directives'], $this->noCacheFlags);
        foreach ($nocacheDirectives as $nocacheDirective) {
            if ($this->getCacheControlDirective($response, $nocacheDirective)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Get the value of a parameter in the cache control header.
     *
     * @param ResponseInterface $response
     * @param string            $name     The field of Cache-Control to fetch
     *
     * @return bool|string The value of the directive, true if directive without value, false if directive not present
     */
    private function getCacheControlDirective(ResponseInterface $response, $name)
    {
        $headers = $response->getHeader('Cache-Control');
        foreach ($headers as $header) {
            if (preg_match(sprintf('|%s=?([0-9]+)?|i', $name), $header, $matches)) {
                // return the value for $name if it exists
                if (isset($matches[1])) {
                    return $matches[1];
                }

                return true;
            }
        }

        return false;
    }

    /**
     * @param RequestInterface $request
     *
     * @return string
     */
    private function createCacheKey(RequestInterface $request)
    {
        $body = (string) $request->getBody();
        if (!empty($body)) {
            $body = ' '.$body;
        }

        return hash($this->config['hash_algo'], $request->getMethod().' '.$request->getUri().$body);
    }

    /**
     * Get a ttl in seconds. It could return null if we do not respect cache headers and got no defaultTtl.
     *
     * @param ResponseInterface $response
     *
     * @return int|null
     */
    private function getMaxAge(ResponseInterface $response)
    {
        if (!in_array('max-age', $this->config['respect_response_cache_directives'], true)) {
            return $this->config['default_ttl'];
        }

        // check for max age in the Cache-Control header
        $maxAge = $this->getCacheControlDirective($response, 'max-age');
        if (!is_bool($maxAge)) {
            $ageHeaders = $response->getHeader('Age');
            foreach ($ageHeaders as $age) {
                return $maxAge - ((int) $age);
            }

            return (int) $maxAge;
        }

        // check for ttl in the Expires header
        $headers = $response->getHeader('Expires');
        foreach ($headers as $header) {
            return (new \DateTime($header))->getTimestamp() - (new \DateTime())->getTimestamp();
        }

        return $this->config['default_ttl'];
    }

    /**
     * Configure an options resolver.
     *
     * @param OptionsResolver $resolver
     */
    private function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'cache_lifetime' => 86400 * 30, // 30 days
            'default_ttl' => 0,
            //Deprecated as of v1.3, to be removed in v2.0. Use respect_response_cache_directives instead
            'respect_cache_headers' => true,
            'hash_algo' => 'sha1',
            'methods' => ['GET', 'HEAD'],
            'respect_response_cache_directives' => ['no-cache', 'private', 'max-age', 'no-store'],
        ]);

        $resolver->setAllowedTypes('cache_lifetime', ['int', 'null']);
        $resolver->setAllowedTypes('default_ttl', ['int', 'null']);
        $resolver->setAllowedTypes('respect_cache_headers', 'bool');
        $resolver->setAllowedTypes('methods', 'array');
        $resolver->setAllowedValues('hash_algo', hash_algos());
        $resolver->setAllowedValues('methods', function ($value) {
            /* RFC7230 sections 3.1.1 and 3.2.6 except limited to uppercase characters. */
            $matches = preg_grep('/[^A-Z0-9!#$%&\'*\/+\-.^_`|~]/', $value);

            return empty($matches);
        });

        $resolver->setNormalizer('respect_cache_headers', function (Options $options, $value) {
            if (null !== $value) {
                @trigger_error('The option "respect_cache_headers" is deprecated since version 1.3 and will be removed in 2.0. Use "respect_response_cache_directives" instead.', E_USER_DEPRECATED);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
            }

            return $value;
        });

        $resolver->setNormalizer('respect_response_cache_directives', function (Options $options, $value) {
            if (false === $options['respect_cache_headers']) {
                return [];
            }

            return $value;
        });
    }

    /**
     * @param CacheItemInterface $cacheItem
     *
     * @return ResponseInterface
     */
    private function createResponseFromCacheItem(CacheItemInterface $cacheItem)
    {
        $data = $cacheItem->get();

        /** @var ResponseInterface $response */
        $response = $data['response'];
        $response = $response->withBody($this->streamFactory->createStream($data['body']));

        return $response;
    }

    /**
     * Get the value of the "If-Modified-Since" header.
     *
     * @param CacheItemInterface $cacheItem
     *
     * @return string|null
     */
    private function getModifiedSinceHeaderValue(CacheItemInterface $cacheItem)
    {
        $data = $cacheItem->get();
        // The isset() is to be removed in 2.0.
        if (!isset($data['createdAt'])) {
            return;
        }

        $modified = new \DateTime('@'.$data['createdAt']);
        $modified->setTimezone(new \DateTimeZone('GMT'));

        return sprintf('%s GMT', $modified->format('l, d-M-y H:i:s'));
    }

    /**
     * Get the ETag from the cached response.
     *
     * @param CacheItemInterface $cacheItem
     *
     * @return string|null
     */
    private function getETag(CacheItemInterface $cacheItem)
    {
        $data = $cacheItem->get();
        // The isset() is to be removed in 2.0.
        if (!isset($data['etag'])) {
            return;
        }

        if (!is_array($data['etag'])) {
            return $data['etag'];
        }

        foreach ($data['etag'] as $etag) {
            if (!empty($etag)) {
                return $etag;
            }
        }
    }
}


1		<?php
2
3		namespace Http\Client\Common\Plugin;
4
5		use Http\Client\Common\Plugin;
6		use Http\Message\StreamFactory;
7		use Http\Promise\FulfilledPromise;
8		use Psr\Cache\CacheItemInterface;
9		use Psr\Cache\CacheItemPoolInterface;
10		use Psr\Http\Message\RequestInterface;
11		use Psr\Http\Message\ResponseInterface;
12		use Symfony\Component\OptionsResolver\Options;
13		use Symfony\Component\OptionsResolver\OptionsResolver;
14
15		/**
16		* Allow for caching a response.
17		*
18		* @author Tobias Nyholm <[email protected]>
19		*/
20		final class CachePlugin implements Plugin
21		{
22		/**
23		* @var CacheItemPoolInterface
24		*/
25		private $pool;
26
27		/**
28		* @var StreamFactory
29		*/
30		private $streamFactory;
31
32		/**
33		* @var array
34		*/
35		private $config;
36
37		/**
38		* Cache directives indicating if a response can not be cached.
39		*
40		* @var array
41		*/
42		private $noCacheFlags = ['no-cache', 'private', 'no-store'];
43
44		/**
45		* @param CacheItemPoolInterface $pool
46		* @param StreamFactory $streamFactory
47		* @param array $config {
48		*
49		* @var bool $respect_cache_headers Whether to look at the cache directives or ignore them
50		* @var int $default_ttl (seconds) If we do not respect cache headers or can't calculate a good ttl, use this
51		* value
52		* @var string $hash_algo The hashing algorithm to use when generating cache keys
53		* @var int $cache_lifetime (seconds) To support serving a previous stale response when the server answers 304
54		* we have to store the cache for a longer time than the server originally says it is valid for.
55		* We store a cache item for $cache_lifetime + max age of the response.
56		* @var array $methods list of request methods which can be cached
57		* @var array $respect_response_cache_directives list of cache directives this plugin will respect while caching responses.
58		* }
59		*/
60	13	public function __construct(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
61		{
62	13	$this->pool = $pool;
63	13	$this->streamFactory = $streamFactory;
64
65	13	if (isset($config['respect_cache_headers']) && isset($config['respect_response_cache_directives'])) {
66	1	throw new \InvalidArgumentException(
67		'You can\'t provide config option "respect_cache_headers" and "respect_response_cache_directives". '.
68		'Use "respect_response_cache_directives" instead.'
69		);
70		}
71
72	13	$optionsResolver = new OptionsResolver();
73	13	$this->configureOptions($optionsResolver);
74	13	$this->config = $optionsResolver->resolve($config);
75	12	}
76
77		/**
78		* This method will setup the cachePlugin in client cache mode. When using the client cache mode the plugin will
79		* cache responses with `private` cache directive.
80		*
81		* @param CacheItemPoolInterface $pool
82		* @param StreamFactory $streamFactory
83		* @param array $config For all possible config options see the constructor docs
84		*
85		* @return CachePlugin
86		*/
87	1	public static function clientCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
88		{
89		// Allow caching of private requests
90	1	if (isset($config['respect_response_cache_directives'])) {
91		$config['respect_response_cache_directives'][] = 'no-cache';
92		$config['respect_response_cache_directives'][] = 'max-age';
93		$config['respect_response_cache_directives'] = array_unique($config['respect_response_cache_directives']);
94		} else {
95	1	$config['respect_response_cache_directives'] = ['no-cache', 'max-age'];
96		}
97
98	1	return new self($pool, $streamFactory, $config);
99		}
100
101		/**
102		* This method will setup the cachePlugin in server cache mode. This is the default caching behavior it refuses to
103		* cache responses with the `private`or `no-cache` directives.
104		*
105		* @param CacheItemPoolInterface $pool
106		* @param StreamFactory $streamFactory
107		* @param array $config For all possible config options see the constructor docs
108		*
109		* @return CachePlugin
110		*/
111		public static function serverCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
112		{
113		return new self($pool, $streamFactory, $config);
114		}
115
116		/**
117		* {@inheritdoc}
118		*/
119	10	public function handleRequest(RequestInterface $request, callable $next, callable $first)
120		{
121	10	$method = strtoupper($request->getMethod());
122		// if the request not is cachable, move to $next
123	10	if (!in_array($method, $this->config['methods'])) {
124	1	return $next($request);
125		}
126
127		// If we can cache the request
128	9	$key = $this->createCacheKey($request);
129	9	$cacheItem = $this->pool->getItem($key);
130
131	9	if ($cacheItem->isHit()) {
132	3	$data = $cacheItem->get();
133		// The array_key_exists() is to be removed in 2.0.
134	3	if (array_key_exists('expiresAt', $data) && ($data['expiresAt'] === null \|\| time() < $data['expiresAt'])) {
135		// This item is still valid according to previous cache headers
136	1	return new FulfilledPromise($this->createResponseFromCacheItem($cacheItem));
137		}
138
139		// Add headers to ask the server if this cache is still valid
140	2	if ($modifiedSinceValue = $this->getModifiedSinceHeaderValue($cacheItem)) {
141	2	$request = $request->withHeader('If-Modified-Since', $modifiedSinceValue);
142	2	}
143
144	2	if ($etag = $this->getETag($cacheItem)) {
145	2	$request = $request->withHeader('If-None-Match', $etag);
146	2	}
147	2	}
148
149		return $next($request)->then(function (ResponseInterface $response) use ($cacheItem) {
150	8	if (304 === $response->getStatusCode()) {
151	2	if (!$cacheItem->isHit()) {
152		/*
153		* We do not have the item in cache. This plugin did not add If-Modified-Since
154		* or If-None-Match headers. Return the response from server.
155		*/
156	1	return $response;
157		}
158
159		// The cached response we have is still valid
160	1	$data = $cacheItem->get();
161	1	$maxAge = $this->getMaxAge($response);
162	1	$data['expiresAt'] = $this->calculateResponseExpiresAt($maxAge);
163	1	$cacheItem->set($data)->expiresAfter($this->calculateCacheItemExpiresAfter($maxAge));
164	1	$this->pool->save($cacheItem);
165
166	1	return $this->createResponseFromCacheItem($cacheItem);
167		}
168
169	6	if ($this->isCacheable($response)) {
170	5	$bodyStream = $response->getBody();
171	5	$body = $bodyStream->__toString();
172	5	if ($bodyStream->isSeekable()) {
173	5	$bodyStream->rewind();
174	5	} else {
175		$response = $response->withBody($this->streamFactory->createStream($body));
176		}
177
178	5	$maxAge = $this->getMaxAge($response);
179		$cacheItem
180	5	->expiresAfter($this->calculateCacheItemExpiresAfter($maxAge))
181	5	->set([
182	5	'response' => $response,
183	5	'body' => $body,
184	5	'expiresAt' => $this->calculateResponseExpiresAt($maxAge),
185	5	'createdAt' => time(),
186	5	'etag' => $response->getHeader('ETag'),
187	5	]);
188	5	$this->pool->save($cacheItem);
189	5	}
190
191	6	return $response;
192	8	});
193		}
194
195		/**
196		* Calculate the timestamp when this cache item should be dropped from the cache. The lowest value that can be
197		* returned is $maxAge.
198		*
199		* @param int\|null $maxAge
200		*
201		* @return int\|null Unix system time passed to the PSR-6 cache
202		*/
203	6	private function calculateCacheItemExpiresAfter($maxAge)
204		{
205	6	if ($this->config['cache_lifetime'] === null && $maxAge === null) {
206		return;
207		}
208
209	6	return $this->config['cache_lifetime'] + $maxAge;
210		}
211
212		/**
213		* Calculate the timestamp when a response expires. After that timestamp, we need to send a
214		* If-Modified-Since / If-None-Match request to validate the response.
215		*
216		* @param int\|null $maxAge
217		*
218		* @return int\|null Unix system time. A null value means that the response expires when the cache item expires
219		*/
220	6	private function calculateResponseExpiresAt($maxAge)
221		{
222	6	if ($maxAge === null) {
223		return;
224		}
225
226	6	return time() + $maxAge;
227		}
228
229		/**
230		* Verify that we can cache this response.
231		*
232		* @param ResponseInterface $response
233		*
234		* @return bool
235		*/
236	6	protected function isCacheable(ResponseInterface $response)
237		{
238	6	if (!in_array($response->getStatusCode(), [200, 203, 300, 301, 302, 404, 410])) {
239	1	return false;
240		}
241
242	5	$nocacheDirectives = array_intersect($this->config['respect_response_cache_directives'], $this->noCacheFlags);
243	5	foreach ($nocacheDirectives as $nocacheDirective) {
244	5	if ($this->getCacheControlDirective($response, $nocacheDirective)) {
245		return false;
246		}
247	5	}
248
249	5	return true;
250		}
251
252		/**
253		* Get the value of a parameter in the cache control header.
254		*
255		* @param ResponseInterface $response
256		* @param string $name The field of Cache-Control to fetch
257		*
258		* @return bool\|string The value of the directive, true if directive without value, false if directive not present
259		*/
260	6	private function getCacheControlDirective(ResponseInterface $response, $name)
261		{
262	6	$headers = $response->getHeader('Cache-Control');
263	6	foreach ($headers as $header) {
264	2	if (preg_match(sprintf('\|%s=?([0-9]+)?\|i', $name), $header, $matches)) {
265		// return the value for $name if it exists
266	1	if (isset($matches[1])) {
267	1	return $matches[1];
268		}
269
270		return true;
271		}
272	6	}
273
274	6	return false;
275		}
276
277		/**
278		* @param RequestInterface $request
279		*
280		* @return string
281		*/
282	9	private function createCacheKey(RequestInterface $request)
283		{
284	9	$body = (string) $request->getBody();
285	9	if (!empty($body)) {
286	1	$body = ' '.$body;
287	1	}
288
289	9	return hash($this->config['hash_algo'], $request->getMethod().' '.$request->getUri().$body);
290		}
291
292		/**
293		* Get a ttl in seconds. It could return null if we do not respect cache headers and got no defaultTtl.
294		*
295		* @param ResponseInterface $response
296		*
297		* @return int\|null
298		*/
299	6	private function getMaxAge(ResponseInterface $response)
300		{
301	6	if (!in_array('max-age', $this->config['respect_response_cache_directives'], true)) {
302		return $this->config['default_ttl'];
303		}
304
305		// check for max age in the Cache-Control header
306	6	$maxAge = $this->getCacheControlDirective($response, 'max-age');
307	6	if (!is_bool($maxAge)) {
308	1	$ageHeaders = $response->getHeader('Age');
309	1	foreach ($ageHeaders as $age) {
310	1	return $maxAge - ((int) $age);
311		}
312
313		return (int) $maxAge;
314		}
315
316		// check for ttl in the Expires header
317	5	$headers = $response->getHeader('Expires');
318	5	foreach ($headers as $header) {
319		return (new \DateTime($header))->getTimestamp() - (new \DateTime())->getTimestamp();
320	5	}
321
322	5	return $this->config['default_ttl'];
323		}
324
325		/**
326		* Configure an options resolver.
327		*
328		* @param OptionsResolver $resolver
329		*/
330	13	private function configureOptions(OptionsResolver $resolver)
331		{
332	13	$resolver->setDefaults([
333	13	'cache_lifetime' => 86400 * 30, // 30 days
334	13	'default_ttl' => 0,
335		//Deprecated as of v1.3, to be removed in v2.0. Use respect_response_cache_directives instead
336	13	'respect_cache_headers' => true,
337	13	'hash_algo' => 'sha1',
338	13	'methods' => ['GET', 'HEAD'],
339	13	'respect_response_cache_directives' => ['no-cache', 'private', 'max-age', 'no-store'],
340	13	]);
341
342	13	$resolver->setAllowedTypes('cache_lifetime', ['int', 'null']);
343	13	$resolver->setAllowedTypes('default_ttl', ['int', 'null']);
344	13	$resolver->setAllowedTypes('respect_cache_headers', 'bool');
345	13	$resolver->setAllowedTypes('methods', 'array');
346	13	$resolver->setAllowedValues('hash_algo', hash_algos());
347		$resolver->setAllowedValues('methods', function ($value) {
348		/* RFC7230 sections 3.1.1 and 3.2.6 except limited to uppercase characters. */
349	13	$matches = preg_grep('/[^A-Z0-9!#$%&\'*\/+\-.^_`\|~]/', $value);
350
351	13	return empty($matches);
352	13	});
353
354		$resolver->setNormalizer('respect_cache_headers', function (Options $options, $value) {
355	13	if (null !== $value) {
356	13	@trigger_error('The option "respect_cache_headers" is deprecated since version 1.3 and will be removed in 2.0. Use "respect_response_cache_directives" instead.', E_USER_DEPRECATED);
		0 ignored issues – show Security Best Practice introduced 2017-02-22 17:22 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
357	13	}
358
359	13	return $value;
360	13	});
361
362	13	$resolver->setNormalizer('respect_response_cache_directives', function (Options $options, $value) {
363	12	if (false === $options['respect_cache_headers']) {
364		return [];
365		}
366
367	12	return $value;
368	13	});
369	13	}
370
371		/**
372		* @param CacheItemInterface $cacheItem
373		*
374		* @return ResponseInterface
375		*/
376	2	private function createResponseFromCacheItem(CacheItemInterface $cacheItem)
377		{
378	2	$data = $cacheItem->get();
379
380		/** @var ResponseInterface $response */
381	2	$response = $data['response'];
382	2	$response = $response->withBody($this->streamFactory->createStream($data['body']));
383
384	2	return $response;
385		}
386
387		/**
388		* Get the value of the "If-Modified-Since" header.
389		*
390		* @param CacheItemInterface $cacheItem
391		*
392		* @return string\|null
393		*/
394	2	private function getModifiedSinceHeaderValue(CacheItemInterface $cacheItem)
395		{
396	2	$data = $cacheItem->get();
397		// The isset() is to be removed in 2.0.
398	2	if (!isset($data['createdAt'])) {
399		return;
400		}
401
402	2	$modified = new \DateTime('@'.$data['createdAt']);
403	2	$modified->setTimezone(new \DateTimeZone('GMT'));
404
405	2	return sprintf('%s GMT', $modified->format('l, d-M-y H:i:s'));
406		}
407
408		/**
409		* Get the ETag from the cached response.
410		*
411		* @param CacheItemInterface $cacheItem
412		*
413		* @return string\|null
414		*/
415	2	private function getETag(CacheItemInterface $cacheItem)
416		{
417	2	$data = $cacheItem->get();
418		// The isset() is to be removed in 2.0.
419	2	if (!isset($data['etag'])) {
420		return;
421		}
422
423	2	if (!is_array($data['etag'])) {
424		return $data['etag'];
425		}
426
427	2	foreach ($data['etag'] as $etag) {
428	2	if (!empty($etag)) {
429	2	return $etag;
430		}
431		}
432		}
433		}
434

php-http / cache-plugin

Pull Request — master (#26)

CachePlugin::createCacheKey() A

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