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

Completed

Pull Request — master (#26)

by Jeroen

created 2017-02-22 17:15 UTC

CachePlugin::clientCache() A

↳ Parent: CachePlugin

Complexity

Conditions	3
Paths	3

Size

Total Lines	13
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	3

Importance

Changes

Metric	Value
dl	0
loc	13
ccs	6
cts	6
cp	1
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	7
nc	3
nop	3
crap	3

<?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;

    /**
     * @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.
     * }
     */
    public function __construct(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        $this->pool = $pool;
        $this->streamFactory = $streamFactory;

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

    public static function clientCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        // Allow caching of private requests
        if (isset($config['respect_response_cache_directives'])) {
            if (!in_array('no-cache', $config['respect_response_cache_directives'], true)) {
                $config['respect_response_cache_directives'][] = ['no-cache'];
            }
        } else {
            $config['respect_response_cache_directives'] = ['no-cache'];
        }

        self::__construct($pool, $streamFactory, $config);
    }

    public static function serverCache(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        self::__construct($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;
        }
        if (!$this->config['respect_cache_headers']) {
            return true;
        }

        foreach ($this->config['respect_response_cache_directives'] as $cacheDirective) {
            if ($this->getCacheControlDirective($response, $cacheDirective)) {
                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 $response)
    {
        if (!$this->config['respect_cache_headers'] || !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'],
        ]);

        $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;
        });
    }

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

php-http / cache-plugin

Pull Request — master (#26)

CachePlugin::clientCache() A

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