first commit

modules/productcomments/vendor/guzzlehttp/cache-subscriber/CHANGELOG.md

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+# CHANGELOG
+
+## 0.2.0 - 2019-09-16
+
+* Improvement: Tests for expired items without must-revalidate #20
+* Improvement: Support for including Vary headers in cache keys #21
+* Improvement: Test for the can_cache option #23
+* Bugfix: Not adding timezone to dates #24
+* Improvement: Add $defaultTtl to CacheStorage constructor #25
+* Bugfix: Error caches responses for without vary headers #26
+* Bugfix: stale-if-header not being added to max-age #27
+* Bugfix: max-age and freshness confusing zero and null #28
+* Bugfix: Use date() method to fix missing GMT #29
+* Improvement: Tests for stale-if-error behaviour #30
+* Improvement: Delete cache entries on both 404 and 410 responses #33
+* Refactoring: Minor ValidationSubscriber.php cleanup #35
+* Refactoring: Minor ValidationSubscriber.php cleanup #35
+* Improvement: Extend caching ttl considerations #56
+* Improvement: Add purge method #57
+* Improvement: Integration test for the calculation of the "resident_time" #60
+* Improvement: Support for PHP 7.0 & 7.1 #73
+
+## 0.1.0 - 2014-10-29
+
+* Initial release.

modules/productcomments/vendor/guzzlehttp/cache-subscriber/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2014 Michael Dowling, https://github.com/mtdowling <mtdowling@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

modules/productcomments/vendor/guzzlehttp/cache-subscriber/Makefile

@@ -0,0 +1,14 @@
+all: clean coverage
+
+test:
+	vendor/bin/phpunit
+
+coverage:
+	vendor/bin/phpunit --coverage-html=artifacts/coverage
+	open artifacts/coverage/index.html
+
+view-coverage:
+	open artifacts/coverage/index.html
+
+clean:
+	rm -rf artifacts/*

modules/productcomments/vendor/guzzlehttp/cache-subscriber/README.rst

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+=======================
+Guzzle Cache Subscriber
+=======================
+
+.. important::
+
+    **This repo has not been updated for Guzzle 6 and only supports Guzzle 5.**
+
+    See https://github.com/Kevinrob/guzzle-cache-middleware for a nice Guzzle 6
+    compatible Cache middleware.
+
+Provides a private transparent proxy cache for caching HTTP responses.
+
+Here's a simple example of how it's used:
+
+.. code-block:: php
+
+    use GuzzleHttp\Client;
+    use GuzzleHttp\Subscriber\Cache\CacheSubscriber;
+
+    $client = new Client(['defaults' => ['debug' => true]]);
+
+    // Use the helper method to attach a cache to the client.
+    CacheSubscriber::attach($client);
+
+    // Send the first request
+    $a = $client->get('http://en.wikipedia.org/wiki/Main_Page');
+
+    // Send the second request. This will find a cache hit which must be
+    // validated. The validation request returns a 304, which yields the original
+    // cached response.
+    $b = $client->get('http://en.wikipedia.org/wiki/Main_Page');
+
+Running the above code sample should output verbose cURL information that looks
+something like this:
+
+::
+
+    > GET /wiki/Main_Page HTTP/1.1
+    Host: en.wikipedia.org
+    User-Agent: Guzzle/4.2.1 curl/7.37.0 PHP/5.5.13
+    Via: 1.1 GuzzleCache/4.2.1
+
+    < HTTP/1.1 200 OK
+    < Server: Apache
+    < X-Content-Type-Options: nosniff
+    < Content-language: en
+    < X-UA-Compatible: IE=Edge
+    < Vary: Accept-Encoding,Cookie
+    < Last-Modified: Thu, 21 Aug 2014 01:51:49 GMT
+    < Content-Type: text/html; charset=UTF-8
+    < X-Varnish: 2345493325, 1998949714 1994269567
+    < Via: 1.1 varnish, 1.1 varnish
+    < Transfer-Encoding: chunked
+    < Date: Thu, 21 Aug 2014 02:34:12 GMT
+    < Age: 2541
+    < Connection: keep-alive
+    < X-Cache: cp1055 hit (1), cp1068 frontend hit (25353)
+    < Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
+    < Set-Cookie: GeoIP=US:Seattle:47.6062:-122.3321:v4; Path=/; Domain=.wikipedia.org
+    <
+    * Connection #0 to host en.wikipedia.org left intact
+    * Re-using existing connection! (#0) with host en.wikipedia.org
+    > GET /wiki/Main_Page HTTP/1.1
+    Host: en.wikipedia.org
+    User-Agent: Guzzle/4.2.1 curl/7.37.0 PHP/5.5.13
+    Via: 1.1 GuzzleCache/4.2.1, 1.1 GuzzleCache/4.2.1
+    If-Modified-Since: Thu, 21 Aug 2014 01:51:49 GMT
+
+    < HTTP/1.1 304 Not Modified
+    < Server: Apache
+    < X-Content-Type-Options: nosniff
+    < Content-language: en
+    < X-UA-Compatible: IE=Edge
+    < Vary: Accept-Encoding,Cookie
+    < Last-Modified: Thu, 21 Aug 2014 01:51:49 GMT
+    < Content-Type: text/html; charset=UTF-8
+    < X-Varnish: 2345493325, 1998950450 1994269567
+    < Via: 1.1 varnish, 1.1 varnish
+    < Date: Thu, 21 Aug 2014 02:34:12 GMT
+    < Age: 2541
+    < Connection: keep-alive
+    < X-Cache: cp1055 hit (1), cp1068 frontend hit (25360)
+    < Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
+    < Set-Cookie: GeoIP=US:Seattle:47.6062:-122.3321:v4; Path=/; Domain=.wikipedia.org
+    <
+    * Connection #0 to host en.wikipedia.org left intact
+
+Installing
+----------
+
+Add the following to your composer.json:
+
+.. code-block:: javascript
+
+    {
+        "require": {
+            "guzzlehttp/cache-subscriber": "0.2.*@dev"
+        }
+    }
+
+or
+
+.. code-block:: console
+
+    $ composer require guzzlehttp/cache-subscriber
+
+Creating a CacheSubscriber
+--------------------------
+
+The easiest way to create a CacheSubscriber is using the ``attach()`` helper
+method of ``GuzzleHttp\Subscriber\Cache\CacheSubscriber``. This method accepts
+a request or client object and attaches the necessary subscribers used to
+perform cache lookups, validation requests, and automatic purging of resources.
+
+The ``attach()`` method accepts the following options:
+
+storage
+    A ``GuzzleHttp\Subscriber\Cache\CacheStorageInterface`` object used to
+    store cached responses. If no value is not provided, an in-memory array
+    cache will be used.
+validate
+    A Boolean value that determines if cached response are ever validated
+    against the origin server. This setting defaults to ``true`` but can be
+    disabled by passing ``false``.
+purge
+    A Boolean value that determines if cached responses are purged when
+    non-idempotent requests are sent to their URI. This setting defaults to
+    ``true`` but can be disabled by passing ``false``.
+can_cache
+    An optional callable used to determine if a request can be cached. The
+    callable accepts a ``GuzzleHttp\Message\RequestInterface`` and returns a
+    Boolean value. If no value is provided, the default behavior is utilized.
+
+.. warning::
+
+    This is a WIP update for Guzzle 5+. It hasn't been tested and is in
+    active development. Expect bugs and breaks.

modules/productcomments/vendor/guzzlehttp/cache-subscriber/composer.json

@@ -0,0 +1,30 @@
+{
+    "name": "guzzlehttp/cache-subscriber",
+    "description": "Guzzle HTTP cache subscriber",
+    "homepage": "http://guzzlephp.org/",
+    "keywords": ["cache", "guzzle"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Michael Dowling",
+            "email": "mtdowling@gmail.com",
+            "homepage": "https://github.com/mtdowling"
+        }
+    ],
+    "require": {
+        "php": ">=5.4.0",
+        "guzzlehttp/guzzle": "~5.0",
+        "doctrine/cache": "~1.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4.0"
+    },
+    "autoload": {
+        "psr-4": { "GuzzleHttp\\Subscriber\\Cache\\": "src" }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "0.2-dev"
+        }
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/phpunit.xml.dist

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+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="vendor/autoload.php"
+         colors="true">
+  <testsuites>
+    <testsuite>
+      <directory>tests</directory>
+    </testsuite>
+  </testsuites>
+  <filter>
+    <whitelist>
+      <directory suffix=".php">src</directory>
+    </whitelist>
+  </filter>
+</phpunit>

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/CacheStorage.php

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+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use Doctrine\Common\Cache\Cache;
+use GuzzleHttp\Message\AbstractMessage;
+use GuzzleHttp\Message\MessageInterface;
+use GuzzleHttp\Message\Request;
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\Response;
+use GuzzleHttp\Message\ResponseInterface;
+use GuzzleHttp\Stream;
+use GuzzleHttp\Stream\StreamInterface;
+
+/**
+ * Default cache storage implementation.
+ */
+class CacheStorage implements CacheStorageInterface
+{
+    /** @var string */
+    private $keyPrefix;
+
+    /** @var int Default cache TTL */
+    private $defaultTtl;
+
+    /** @var Cache */
+    private $cache;
+
+    /** @var array Headers are excluded from the caching (see RFC 2616:13.5.1) */
+    private static $noCache = [
+        'age' => true,
+        'connection' => true,
+        'keep-alive' => true,
+        'proxy-authenticate' => true,
+        'proxy-authorization' => true,
+        'te' => true,
+        'trailers' => true,
+        'transfer-encoding' => true,
+        'upgrade' => true,
+        'set-cookie' => true,
+        'set-cookie2' => true,
+    ];
+
+    /**
+     * @param Cache  $cache      Cache backend.
+     * @param string $keyPrefix  (optional) Key prefix to add to each key.
+     * @param int    $defaultTtl (optional) The default TTL to set, in seconds.
+     */
+    public function __construct(Cache $cache, $keyPrefix = null, $defaultTtl = 0)
+    {
+        $this->cache = $cache;
+        $this->keyPrefix = $keyPrefix;
+        $this->defaultTtl = $defaultTtl;
+    }
+
+    public function cache(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $ctime = time();
+        $ttl = $this->getTtl($response);
+        $key = $this->getCacheKey($request, $this->normalizeVary($response));
+        $headers = $this->persistHeaders($request);
+        $entries = $this->getManifestEntries($key, $ctime, $response, $headers);
+        $bodyDigest = null;
+
+        // Persist the Vary response header.
+        if ($response->hasHeader('vary')) {
+            $this->cacheVary($request, $response);
+        }
+
+        // Persist the response body if needed
+        if ($response->getBody() && $response->getBody()->getSize() > 0) {
+            $body = $response->getBody();
+            $bodyDigest = $this->getBodyKey($request->getUrl(), $body);
+            $this->cache->save($bodyDigest, (string) $body, $ttl);
+        }
+
+        array_unshift($entries, [
+            $headers,
+            $this->persistHeaders($response),
+            $response->getStatusCode(),
+            $bodyDigest,
+            $ctime + $ttl
+        ]);
+
+        $this->cache->save($key, serialize($entries));
+    }
+
+    public function delete(RequestInterface $request)
+    {
+        $vary = $this->fetchVary($request);
+        $key = $this->getCacheKey($request, $vary);
+        $entries = $this->cache->fetch($key);
+
+        if (!$entries) {
+            return;
+        }
+
+        // Delete each cached body
+        foreach (unserialize($entries) as $entry) {
+            if ($entry[3]) {
+                $this->cache->delete($entry[3]);
+            }
+        }
+
+        // Delete any cached Vary header responses.
+        $this->deleteVary($request);
+
+        $this->cache->delete($key);
+    }
+
+    public function purge($url)
+    {
+        foreach (['GET', 'HEAD', 'POST', 'PUT', 'DELETE', 'OPTIONS', 'PURGE'] as $m) {
+            $this->delete(new Request($m, $url));
+        }
+    }
+
+    public function fetch(RequestInterface $request)
+    {
+        $vary = $this->fetchVary($request);
+        if ($vary) {
+            $key = $this->getCacheKey($request, $vary);
+        } else {
+            $key = $this->getCacheKey($request);
+        }
+        $entries = $this->cache->fetch($key);
+
+        if (!$entries) {
+            return null;
+        }
+
+        $match = $matchIndex = null;
+        $headers = $this->persistHeaders($request);
+        $entries = unserialize($entries);
+
+        foreach ($entries as $index => $entry) {
+            $vary = isset($entry[1]['vary']) ? $entry[1]['vary'] : '';
+            if ($this->requestsMatch($vary, $headers, $entry[0])) {
+                $match = $entry;
+                $matchIndex = $index;
+                break;
+            }
+        }
+
+        if (!$match) {
+            return null;
+        }
+
+        // Ensure that the response is not expired
+        $response = null;
+        if ($match[4] < time()) {
+            $response = -1;
+        } else {
+            $response = new Response($match[2], $match[1]);
+            if ($match[3]) {
+                if ($body = $this->cache->fetch($match[3])) {
+                    $response->setBody(Stream\Utils::create($body));
+                } else {
+                    // The response is not valid because the body was somehow
+                    // deleted
+                    $response = -1;
+                }
+            }
+        }
+
+        if ($response === -1) {
+            // Remove the entry from the metadata and update the cache
+            unset($entries[$matchIndex]);
+            if ($entries) {
+                $this->cache->save($key, serialize($entries));
+            } else {
+                $this->cache->delete($key);
+            }
+
+            return null;
+        }
+
+        return $response;
+    }
+
+    /**
+     * Hash a request URL into a string that returns cache metadata.
+     *
+     * @param RequestInterface $request The Request to generate the cache key
+     *                                  for.
+     * @param array            $vary    (optional) An array of headers to vary
+     *                                  the cache key by.
+     *
+     * @return string
+     */
+    private function getCacheKey(RequestInterface $request, array $vary = [])
+    {
+        $key = $request->getMethod() . ' ' . $request->getUrl();
+
+        // If Vary headers have been passed in, fetch each header and add it to
+        // the cache key.
+        foreach ($vary as $header) {
+            $key .= " $header: " . $request->getHeader($header);
+        }
+
+        return $this->keyPrefix . md5($key);
+    }
+
+    /**
+     * Create a cache key for a response's body.
+     *
+     * @param string          $url  URL of the entry
+     * @param StreamInterface $body Response body
+     *
+     * @return string
+     */
+    private function getBodyKey($url, StreamInterface $body)
+    {
+        return $this->keyPrefix . md5($url) . Stream\Utils::hash($body, 'md5');
+    }
+
+    /**
+     * Determines whether two Request HTTP header sets are non-varying.
+     *
+     * @param string $vary Response vary header
+     * @param array  $r1   HTTP header array
+     * @param array  $r2   HTTP header array
+     *
+     * @return bool
+     */
+    private function requestsMatch($vary, $r1, $r2)
+    {
+        if ($vary) {
+            foreach (explode(',', $vary) as $header) {
+                $key = trim(strtolower($header));
+                $v1 = isset($r1[$key]) ? $r1[$key] : null;
+                $v2 = isset($r2[$key]) ? $r2[$key] : null;
+                if ($v1 !== $v2) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Creates an array of cacheable and normalized message headers.
+     *
+     * @param MessageInterface $message
+     *
+     * @return array
+     */
+    private function persistHeaders(MessageInterface $message)
+    {
+        // Clone the response to not destroy any necessary headers when caching
+        $headers = array_diff_key($message->getHeaders(), self::$noCache);
+
+        // Cast the headers to a string
+        foreach ($headers as &$value) {
+            $value = implode(', ', $value);
+        }
+
+        return $headers;
+    }
+
+    /**
+     * Return the TTL to use when caching a Response.
+     *
+     * @param ResponseInterface $response The response being cached.
+     *
+     * @return int The TTL in seconds.
+     */
+    private function getTtl(ResponseInterface $response)
+    {
+        $ttl = 0;
+
+        if ($cacheControl = $response->getHeader('Cache-Control')) {
+            $maxAge = Utils::getDirective($response, 'max-age');
+            if (is_numeric($maxAge)) {
+                $ttl += $maxAge;
+            }
+
+            // According to RFC5861 stale headers are *in addition* to any
+            // max-age values.
+            $stale = Utils::getDirective($response, 'stale-if-error');
+            if (is_numeric($stale)) {
+                $ttl += $stale;
+            }
+        } elseif ($expires = $response->getHeader('Expires')) {
+            $ttl += strtotime($expires) - time();
+        }
+
+        return $ttl ?: $this->defaultTtl;
+    }
+
+    private function getManifestEntries(
+        $key,
+        $currentTime,
+        ResponseInterface $response,
+        $persistedRequest
+    ) {
+        $entries = [];
+        $manifest = $this->cache->fetch($key);
+
+        if (!$manifest) {
+            return $entries;
+        }
+
+        // Determine which cache entries should still be in the cache
+        $vary = $response->getHeader('Vary');
+
+        foreach (unserialize($manifest) as $entry) {
+            // Check if the entry is expired
+            if ($entry[4] < $currentTime) {
+                continue;
+            }
+
+            $varyCmp = isset($entry[1]['vary']) ? $entries[1]['vary'] : '';
+
+            if ($vary != $varyCmp ||
+                !$this->requestsMatch($vary, $entry[0], $persistedRequest)
+            ) {
+                $entries[] = $entry;
+            }
+        }
+
+        return $entries;
+    }
+
+    /**
+     * Return a sorted list of Vary headers.
+     *
+     * While headers are case-insensitive, header values are not. We can only
+     * normalize the order of headers to combine cache entries.
+     *
+     * @param ResponseInterface $response The Response with Vary headers.
+     *
+     * @return array An array of sorted headers.
+     */
+    private function normalizeVary(ResponseInterface $response)
+    {
+        $parts = AbstractMessage::normalizeHeader($response, 'vary');
+        sort($parts);
+
+        return $parts;
+    }
+
+    /**
+     * Cache the Vary headers from a response.
+     *
+     * @param RequestInterface  $request  The Request that generated the Vary
+     *                                    headers.
+     * @param ResponseInterface $response The Response with Vary headers.
+     */
+    private function cacheVary(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $key = $this->getVaryKey($request);
+        $this->cache->save($key, $this->normalizeVary($response), $this->getTtl($response));
+    }
+
+    /**
+     * Fetch the Vary headers associated with a request, if they exist.
+     *
+     * Only responses, and not requests, contain Vary headers. However, we need
+     * to be able to determine what Vary headers were set for a given URL and
+     * request method on a future request.
+     *
+     * @param RequestInterface $request The Request to fetch headers for.
+     *
+     * @return array An array of headers.
+     */
+    private function fetchVary(RequestInterface $request)
+    {
+        $key = $this->getVaryKey($request);
+        $varyHeaders = $this->cache->fetch($key);
+
+        return is_array($varyHeaders) ? $varyHeaders : [];
+    }
+
+    /**
+     * Delete the headers associated with a Vary request.
+     *
+     * @param RequestInterface $request The Request to delete headers for.
+     */
+    private function deleteVary(RequestInterface $request)
+    {
+        $key = $this->getVaryKey($request);
+        $this->cache->delete($key);
+    }
+
+    /**
+     * Get the cache key for Vary headers.
+     *
+     * @param RequestInterface $request The Request to fetch the key for.
+     *
+     * @return string The generated key.
+     */
+    private function getVaryKey(RequestInterface $request)
+    {
+        $key = $this->keyPrefix . md5('vary ' . $this->getCacheKey($request));
+
+        return $key;
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/CacheStorageInterface.php

@@ -0,0 +1,45 @@
+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\ResponseInterface;
+
+/**
+ * Interface used to cache HTTP responses.
+ */
+interface CacheStorageInterface
+{
+    /**
+     * Get a Response from the cache for a request.
+     *
+     * @param RequestInterface $request
+     *
+     * @return null|ResponseInterface
+     */
+    public function fetch(RequestInterface $request);
+
+    /**
+     * Cache an HTTP request.
+     *
+     * @param RequestInterface  $request  Request being cached
+     * @param ResponseInterface $response Response to cache
+     */
+    public function cache(
+        RequestInterface $request,
+        ResponseInterface $response
+    );
+
+    /**
+     * Deletes cache entries that match a request.
+     *
+     * @param RequestInterface $request Request to delete from cache
+     */
+    public function delete(RequestInterface $request);
+
+    /**
+     * Purge all cache entries for a given URL.
+     *
+     * @param string $url
+     */
+    public function purge($url);
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/CacheSubscriber.php

@@ -0,0 +1,275 @@
+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use Doctrine\Common\Cache\ArrayCache;
+use GuzzleHttp\ClientInterface;
+use GuzzleHttp\Event\BeforeEvent;
+use GuzzleHttp\Event\CompleteEvent;
+use GuzzleHttp\Event\ErrorEvent;
+use GuzzleHttp\Event\HasEmitterInterface;
+use GuzzleHttp\Event\RequestEvents;
+use GuzzleHttp\Event\SubscriberInterface;
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\ResponseInterface;
+
+/**
+ * Plugin to enable the caching of GET and HEAD requests.
+ *
+ * Caching can be done on all requests passing through this plugin or only
+ * after retrieving resources with cacheable response headers.
+ *
+ * This is a simple implementation of RFC 2616 and should be considered a
+ * private transparent proxy cache, meaning authorization and private data can
+ * be cached.
+ *
+ * It also implements RFC 5861's `stale-if-error` Cache-Control extension,
+ * allowing stale cache responses to be used when an error is encountered
+ * (such as a `500 Internal Server Error` or DNS failure).
+ */
+class CacheSubscriber implements SubscriberInterface
+{
+    /** @var CacheStorageInterface $cache Object used to cache responses */
+    private $storage;
+
+    /** @var callable Determines if a request is cacheable */
+    private $canCache;
+
+    /**
+     * @param CacheStorageInterface $cache    Cache storage
+     * @param callable              $canCache Callable used to determine if a
+     *                                        request can be cached. Accepts a
+     *                                        RequestInterface and returns a
+     *                                        boolean value.
+     */
+    public function __construct(
+        CacheStorageInterface $cache,
+        callable $canCache
+    ) {
+        $this->storage = $cache;
+        $this->canCache = $canCache;
+    }
+
+    /**
+     * Helper method used to easily attach a cache to a request or client.
+     *
+     * This method accepts an array of options that are used to control the
+     * caching behavior:
+     *
+     * - storage: An optional GuzzleHttp\Subscriber\Cache\CacheStorageInterface.
+     *   If no value is not provided, an in-memory array cache will be used.
+     * - validate: Boolean value that determines if cached response are ever
+     *   validated against the origin server. Defaults to true but can be
+     *   disabled by passing false.
+     * - purge: Boolean value that determines if cached responses are purged
+     *   when non-idempotent requests are sent to their URI. Defaults to true
+     *   but can be disabled by passing false.
+     * - can_cache: An optional callable used to determine if a request can be
+     *   cached. The callable accepts a RequestInterface and returns a boolean
+     *   value. If no value is provided, the default behavior is utilized.
+     *
+     * @param HasEmitterInterface $subject Client or request to attach to,
+     * @param array               $options Options used to control the cache.
+     *
+     * @return array Returns an associative array containing a 'subscriber' key
+     *               that holds the created CacheSubscriber, and a 'storage'
+     *               key that contains the cache storage used by the subscriber.
+     */
+    public static function attach(
+        HasEmitterInterface $subject,
+        array $options = []
+    ) {
+        if (!isset($options['storage'])) {
+            $options['storage'] = new CacheStorage(new ArrayCache());
+        }
+
+        if (!isset($options['can_cache'])) {
+            $options['can_cache'] = [
+                'GuzzleHttp\Subscriber\Cache\Utils',
+                'canCacheRequest',
+            ];
+        }
+
+        $emitter = $subject->getEmitter();
+        $cache = new self($options['storage'], $options['can_cache']);
+        $emitter->attach($cache);
+
+        if (!isset($options['validate']) || $options['validate'] === true) {
+            $emitter->attach(new ValidationSubscriber(
+                $options['storage'],
+                $options['can_cache'])
+            );
+        }
+
+        if (!isset($options['purge']) || $options['purge'] === true) {
+            $emitter->attach(new PurgeSubscriber($options['storage']));
+        }
+
+        return ['subscriber' => $cache, 'storage' => $options['storage']];
+    }
+
+    public function getEvents()
+    {
+        return [
+            'before'   => ['onBefore', RequestEvents::LATE],
+            'complete' => ['onComplete', RequestEvents::EARLY],
+            'error'    => ['onError', RequestEvents::EARLY]
+        ];
+    }
+
+    /**
+     * Checks if a request can be cached, and if so, intercepts with a cached
+     * response is available.
+     *
+     * @param BeforeEvent $event
+     */
+    public function onBefore(BeforeEvent $event)
+    {
+        $request = $event->getRequest();
+
+        if (!$this->canCacheRequest($request)) {
+            $this->cacheMiss($request);
+            return;
+        }
+
+        if (!($response = $this->storage->fetch($request))) {
+            $this->cacheMiss($request);
+            return;
+        }
+
+        $response->setHeader('Age', Utils::getResponseAge($response));
+        $valid = $this->validate($request, $response);
+
+        // Validate that the response satisfies the request
+        if ($valid) {
+            $request->getConfig()->set('cache_lookup', 'HIT');
+            $request->getConfig()->set('cache_hit', true);
+            $event->intercept($response);
+        } else {
+            $this->cacheMiss($request);
+        }
+    }
+
+    /**
+     * Checks if the request and response can be cached, and if so, store it.
+     *
+     * @param CompleteEvent $event
+     */
+    public function onComplete(CompleteEvent $event)
+    {
+        $request = $event->getRequest();
+        $response = $event->getResponse();
+
+        // Cache the response if it can be cached and isn't already
+        if ($request->getConfig()->get('cache_lookup') === 'MISS'
+            && call_user_func($this->canCache, $request)
+            && Utils::canCacheResponse($response)
+        ) {
+            // Store the date when the response was cached
+            $response->setHeader('X-Guzzle-Cache-Date', gmdate('D, d M Y H:i:s T', time()));
+            $this->storage->cache($request, $response);
+        }
+
+        $this->addResponseHeaders($request, $response);
+    }
+
+    /**
+     * If the request failed, then check if a cached response would suffice.
+     *
+     * @param ErrorEvent $event
+     */
+    public function onError(ErrorEvent $event)
+    {
+        $request = $event->getRequest();
+
+        if (!call_user_func($this->canCache, $request)) {
+            return;
+        }
+
+        $response = $this->storage->fetch($request);
+
+        // Intercept the failed response if possible
+        if ($response && $this->validateFailed($request, $response)) {
+            $request->getConfig()->set('cache_hit', 'error');
+            $response->setHeader('Age', Utils::getResponseAge($response));
+            $event->intercept($response);
+        }
+    }
+
+    private function cacheMiss(RequestInterface $request)
+    {
+        $request->getConfig()->set('cache_lookup', 'MISS');
+    }
+
+    private function validate(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        // Validation is handled in another subscriber and can be optionally
+        // enabled/disabled.
+        if (Utils::getDirective($response, 'must-revalidate')) {
+            return true;
+        }
+
+        return Utils::isResponseValid($request, $response);
+    }
+
+    private function validateFailed(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $req = Utils::getDirective($request, 'stale-if-error');
+        $res = Utils::getDirective($response, 'stale-if-error');
+
+        if (!$req && !$res) {
+            return false;
+        }
+
+        $responseAge = Utils::getResponseAge($response);
+        $maxAge = Utils::getMaxAge($response);
+
+        if (($req && $responseAge - $maxAge > $req) ||
+            ($responseAge - $maxAge > $res)
+        ) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function canCacheRequest(RequestInterface $request)
+    {
+        return !$request->getConfig()->get('cache.disable')
+        && call_user_func($this->canCache, $request);
+    }
+
+    private function addResponseHeaders(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $params = $request->getConfig();
+        $lookup = $params['cache_lookup'] . ' from GuzzleCache';
+        $response->addHeader('X-Cache-Lookup', $lookup);
+
+        if ($params['cache_hit'] === true) {
+            $response->addHeader('X-Cache', 'HIT from GuzzleCache');
+        } elseif ($params['cache_hit'] == 'error') {
+            $response->addHeader('X-Cache', 'HIT_ERROR from GuzzleCache');
+        } else {
+            $response->addHeader('X-Cache', 'MISS from GuzzleCache');
+        }
+
+        $freshness = Utils::getFreshness($response);
+
+        // Only add a Warning header if we are returning a stale response.
+        if ($params['cache_hit'] && $freshness !== null && $freshness <= 0) {
+            $response->addHeader(
+                'Warning',
+                sprintf(
+                    '%d GuzzleCache/' . ClientInterface::VERSION . ' "%s"',
+                    110,
+                    'Response is stale'
+                )
+            );
+        }
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/PurgeSubscriber.php

@@ -0,0 +1,51 @@
+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use GuzzleHttp\Event\BeforeEvent;
+use GuzzleHttp\Event\RequestEvents;
+use GuzzleHttp\Event\SubscriberInterface;
+use GuzzleHttp\Message\Response;
+
+/**
+ * Automatically purges a URL when a non-idempotent request is made to it.
+ */
+class PurgeSubscriber implements SubscriberInterface
+{
+    /** @var CacheStorageInterface */
+    private $storage;
+
+    /** @var array */
+    private static $purgeMethods = [
+        'PUT'    => true,
+        'POST'   => true,
+        'DELETE' => true,
+        'PATCH'  => true,
+        'PURGE'  => true,
+    ];
+
+    /**
+     * @param CacheStorageInterface $storage Storage to modify if purging
+     */
+    public function __construct($storage)
+    {
+        $this->storage = $storage;
+    }
+
+    public function getEvents()
+    {
+        return ['before' => ['onBefore', RequestEvents::LATE]];
+    }
+
+    public function onBefore(BeforeEvent $event)
+    {
+        $request = $event->getRequest();
+
+        if (isset(self::$purgeMethods[$request->getMethod()])) {
+            $this->storage->purge($request->getUrl());
+
+            if ('PURGE' === $request->getMethod()) {
+                $event->intercept(new Response(204));
+            }
+        }
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/Utils.php

@@ -0,0 +1,202 @@
+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use GuzzleHttp\Message\AbstractMessage;
+use GuzzleHttp\Message\MessageInterface;
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\ResponseInterface;
+
+/**
+ * Cache utility functions.
+ */
+class Utils
+{
+    /**
+     * Get a cache control directive from a message.
+     *
+     * @param MessageInterface $message Message to retrieve
+     * @param string           $part    Cache directive to retrieve
+     *
+     * @return mixed|bool|null
+     */
+    public static function getDirective(MessageInterface $message, $part)
+    {
+        $parts = AbstractMessage::parseHeader($message, 'Cache-Control');
+
+        foreach ($parts as $line) {
+            if (isset($line[$part])) {
+                return $line[$part];
+            } elseif (in_array($part, $line)) {
+                return true;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Gets the age of a response in seconds.
+     *
+     * @param ResponseInterface $response
+     *
+     * @return int
+     */
+    public static function getResponseAge(ResponseInterface $response)
+    {
+        if ($response->hasHeader('Age')) {
+            return (int) $response->getHeader('Age');
+        }
+
+        $date = strtotime($response->getHeader('Date') ?: 'now');
+
+        return time() - $date;
+    }
+
+    /**
+     * Gets the number of seconds from the current time in which a response
+     * is still considered fresh.
+     *
+     * @param ResponseInterface $response
+     *
+     * @return int|null Returns the number of seconds
+     */
+    public static function getMaxAge(ResponseInterface $response)
+    {
+        $smaxage = Utils::getDirective($response, 's-maxage');
+        if (is_numeric($smaxage)) {
+            return (int) $smaxage;
+        }
+
+        $maxage = Utils::getDirective($response, 'max-age');
+        if (is_numeric($maxage)) {
+            return (int) $maxage;
+        }
+
+        if ($response->hasHeader('Expires')) {
+            return strtotime($response->getHeader('Expires')) - time();
+        }
+
+        return null;
+    }
+
+    /**
+     * Get the freshness of a response by returning the difference of the
+     * maximum lifetime of the response and the age of the response.
+     *
+     * Freshness values less than 0 mean that the response is no longer fresh
+     * and is ABS(freshness) seconds expired. Freshness values of greater than
+     * zero is the number of seconds until the response is no longer fresh.
+     * A NULL result means that no freshness information is available.
+     *
+     * @param ResponseInterface $response Response to get freshness of
+     *
+     * @return int|null
+     */
+    public static function getFreshness(ResponseInterface $response)
+    {
+        $maxAge = self::getMaxAge($response);
+        $age = self::getResponseAge($response);
+
+        return is_int($maxAge) && is_int($age) ? ($maxAge - $age) : null;
+    }
+
+    /**
+     * Default function used to determine if a request can be cached.
+     *
+     * @param RequestInterface $request Request to check
+     *
+     * @return bool
+     */
+    public static function canCacheRequest(RequestInterface $request)
+    {
+        $method = $request->getMethod();
+
+        // Only GET and HEAD requests can be cached
+        if ($method !== 'GET' && $method !== 'HEAD') {
+            return false;
+        }
+
+        // Don't fool with Range requests for now
+        if ($request->hasHeader('Range')) {
+            return false;
+        }
+
+        return self::getDirective($request, 'no-store') === null;
+    }
+
+    /**
+     * Determines if a response can be cached.
+     *
+     * @param ResponseInterface $response Response to check
+     *
+     * @return bool
+     */
+    public static function canCacheResponse(ResponseInterface $response)
+    {
+        static $cacheCodes = [200, 203, 300, 301, 410];
+
+        // Check if the response is cacheable based on the code
+        if (!in_array((int) $response->getStatusCode(), $cacheCodes)) {
+            return false;
+        }
+
+        // Make sure a valid body was returned and can be cached
+        $body = $response->getBody();
+        if ($body && (!$body->isReadable() || !$body->isSeekable())) {
+            return false;
+        }
+
+        // Never cache no-store resources (this is a private cache, so private
+        // can be cached)
+        if (self::getDirective($response, 'no-store')) {
+            return false;
+        }
+
+        // Don't fool with Content-Range requests for now
+        if ($response->hasHeader('Content-Range')) {
+            return false;
+        }
+
+        $freshness = self::getFreshness($response);
+
+        return $freshness === null                    // No freshness info.
+            || $freshness >= 0                        // It's fresh
+            || $response->hasHeader('ETag')           // Can validate
+            || $response->hasHeader('Last-Modified'); // Can validate
+    }
+
+    public static function isResponseValid(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $responseAge = Utils::getResponseAge($response);
+        $maxAge = Utils::getDirective($response, 'max-age');
+
+        // Increment the age based on the X-Guzzle-Cache-Date
+        if ($cacheDate = $response->getHeader('X-Guzzle-Cache-Date')) {
+            $responseAge += (time() - strtotime($cacheDate));
+            $response->setHeader('Age', $responseAge);
+        }
+
+        // Check the request's max-age header against the age of the response
+        if ($maxAge !== null && $responseAge > $maxAge) {
+            return false;
+        }
+
+        // Check the response's max-age header against the freshness level
+        $freshness = Utils::getFreshness($response);
+
+        if ($freshness !== null) {
+            $maxStale = Utils::getDirective($request, 'max-stale');
+            if ($maxStale !== null) {
+                if ($freshness < (-1 * $maxStale)) {
+                    return false;
+                }
+            } elseif ($maxAge !== null && $responseAge > $maxAge) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/src/ValidationSubscriber.php

@@ -0,0 +1,207 @@
+<?php
+namespace GuzzleHttp\Subscriber\Cache;
+
+use GuzzleHttp\Event\CompleteEvent;
+use GuzzleHttp\Event\RequestEvents;
+use GuzzleHttp\Event\SubscriberInterface;
+use GuzzleHttp\Exception\BadResponseException;
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\ResponseInterface;
+
+/**
+ * Validates cached responses as needed.
+ *
+ * @Link http://tools.ietf.org/html/rfc7234#section-4.3
+ */
+class ValidationSubscriber implements SubscriberInterface
+{
+    /** @var CacheStorageInterface Cache object storing cache data */
+    private $storage;
+
+    /** @var callable */
+    private $canCache;
+
+    /** @var array */
+    private static $gone = [404 => true, 410 => true];
+
+    /** @var array */
+    private static $replaceHeaders = [
+        'Date',
+        'Expires',
+        'Cache-Control',
+        'ETag',
+        'Last-Modified',
+    ];
+
+    /**
+     * @param CacheStorageInterface $cache    Cache storage
+     * @param callable              $canCache Callable used to determine if a
+     *                                        request can be cached. Accepts a
+     *                                        RequestInterface and returns a
+     *                                        boolean value.
+     */
+    public function __construct(
+        CacheStorageInterface $cache,
+        callable $canCache
+    ) {
+        $this->storage = $cache;
+        $this->canCache = $canCache;
+    }
+
+    public function getEvents()
+    {
+        return ['complete' => ['onComplete', RequestEvents::EARLY]];
+    }
+
+    public function onComplete(CompleteEvent $e)
+    {
+        $lookup = $e->getRequest()->getConfig()->get('cache_lookup');
+
+        if ($lookup == 'HIT' &&
+            $this->shouldvalidate($e->getRequest(), $e->getResponse())
+        ) {
+            $this->validate($e->getRequest(), $e->getResponse(), $e);
+        }
+    }
+
+    private function validate(
+        RequestInterface $request,
+        ResponseInterface $response,
+        CompleteEvent $event
+    ) {
+        try {
+            $validate = $this->createRevalidationRequest($request, $response);
+            $validated = $event->getClient()->send($validate);
+        } catch (BadResponseException $e) {
+            $this->handleBadResponse($e);
+        }
+
+        if ($validated->getStatusCode() == 200) {
+            $this->handle200Response($request, $validated, $event);
+        } elseif ($validated->getStatusCode() == 304) {
+            $this->handle304Response($request, $response, $validated, $event);
+        }
+    }
+
+    private function shouldValidate(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        if ($request->getMethod() != 'GET'
+            || $request->getConfig()->get('cache.disable')
+        ) {
+            return false;
+        }
+
+        $validate = Utils::getDirective($request, 'Pragma') === 'no-cache'
+            || Utils::getDirective($response, 'Pragma') === 'no-cache'
+            || Utils::getDirective($request, 'must-revalidate')
+            || Utils::getDirective($response, 'must-revalidate')
+            || Utils::getDirective($request, 'no-cache')
+            || Utils::getDirective($response, 'no-cache')
+            || Utils::getDirective($response, 'max-age') === '0'
+            || Utils::getDirective($response, 's-maxage') === '0';
+
+        // Use the strong ETag validator if available and the response contains
+        // no Cache-Control directive
+        if (!$validate
+            && !$response->hasHeader('Cache-Control')
+            && $response->hasHeader('ETag')
+        ) {
+            $validate = true;
+        }
+
+        return $validate;
+    }
+
+    /**
+     * Handles a bad response when attempting to validate.
+     *
+     * If the resource no longer exists, then remove from the cache.
+     *
+     * @param BadResponseException $e Exception encountered
+     *
+     * @throws BadResponseException
+     */
+    private function handleBadResponse(BadResponseException $e)
+    {
+        if (isset(self::$gone[$e->getResponse()->getStatusCode()])) {
+            $this->storage->delete($e->getRequest());
+        }
+
+        throw $e;
+    }
+
+    /**
+     * Creates a request to use for revalidation.
+     *
+     * @param RequestInterface  $request  Request
+     * @param ResponseInterface $response Response to validate
+     *
+     * @return RequestInterface returns a revalidation request
+     */
+    private function createRevalidationRequest(
+        RequestInterface $request,
+        ResponseInterface $response
+    ) {
+        $validate = clone $request;
+        $validate->getConfig()->set('cache.disable', true);
+        $validate->removeHeader('Pragma');
+        $validate->removeHeader('Cache-Control');
+        $responseDate = $response->getHeader('Last-Modified')
+            ?: $response->getHeader('Date');
+        $validate->setHeader('If-Modified-Since', $responseDate);
+
+        if ($etag = $response->getHeader('ETag')) {
+            $validate->setHeader('If-None-Match', $etag);
+        }
+
+        return $validate;
+    }
+
+    private function handle200Response(
+        RequestInterface $request,
+        ResponseInterface $validateResponse,
+        CompleteEvent $event
+    ) {
+        // Store the 200 response in the cache if possible
+        if (Utils::canCacheResponse($validateResponse)) {
+            $this->storage->cache($request, $validateResponse);
+        }
+
+        $event->intercept($validateResponse);
+    }
+
+    private function handle304Response(
+        RequestInterface $request,
+        ResponseInterface $response,
+        ResponseInterface $validated,
+        CompleteEvent $event
+    ) {
+        // Make sure that this response has the same ETag
+        if ($validated->getHeader('ETag') !== $response->getHeader('ETag')) {
+            // Revalidation failed, so remove from cache and retry.
+            $this->storage->delete($request);
+            $event->intercept($event->getClient()->send($request));
+
+            return;
+        }
+
+        // Replace cached headers with any of these headers from the
+        // origin server that might be more up to date
+        $modified = false;
+        foreach (self::$replaceHeaders as $name) {
+            if ($validated->hasHeader($name)
+                && $validated->getHeader($name) != $response->getHeader($name)
+            ) {
+                $modified = true;
+                $response->setHeader($name, $validated->getHeader($name));
+            }
+        }
+
+        // Store the updated response in cache
+        if ($modified) {
+            $this->storage->cache($request, $response);
+        }
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/tests/CacheStorageTest.php

@@ -0,0 +1,138 @@
+<?php
+
+namespace GuzzleHttp\Tests\Subscriber\Cache;
+
+use Doctrine\Common\Cache\ArrayCache;
+use GuzzleHttp\Message\Response;
+use GuzzleHttp\Subscriber\Cache\CacheStorage;
+
+/**
+ * Test the CacheStorage class.
+ *
+ * @class CacheStorageTest
+ */
+class CacheStorageTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Test that a Response's max-age returns the correct TTL.
+     */
+    public function testGetTtlMaxAge()
+    {
+        $response = new Response(200, [
+            'Cache-control' => 'max-age=10',
+        ]);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(10, $ttl);
+    }
+
+    /**
+     * Test that the default TTL for cachable responses with no max-age headers
+     * is zero.
+     */
+    public function testGetTtlDefault()
+    {
+        $response = new Response(200);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+
+        // assertSame() here to be specific about null / false returns.
+        $this->assertSame(0, $ttl);
+    }
+
+    /**
+     * Test setting the default TTL.
+     */
+    public function testSetTtlDefault()
+    {
+        $response = new Response(200);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache(), null, 10);
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(10, $ttl);
+    }
+
+    /**
+     * Test that stale-if-error is added to the max-age header.
+     */
+    public function testGetTtlMaxAgeStaleIfError()
+    {
+        $response = new Response(200, [
+            'Cache-control' => 'max-age=10, stale-if-error=10',
+        ]);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(20, $ttl);
+    }
+
+    /**
+     * Test that stale-if-error works without a max-age header.
+     */
+    public function testGetTtlStaleIfErrorAlone()
+    {
+        $response = new Response(200, [
+            'Cache-control' => 'stale-if-error=10',
+        ]);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(10, $ttl);
+    }
+
+    /**
+     * Test that expires is considered when cache-control is not available.
+     */
+    public function testGetTtlExpires()
+    {
+        $expires = new \DateTime('+100 seconds');
+        $response = new Response(200, [
+            'Expires' => $expires->format(DATE_RFC1123),
+        ]);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(100, $ttl);
+    }
+
+    /**
+     * Test that cache-control is considered before expires.
+     */
+    public function testGetTtlCacheControlExpires()
+    {
+        $expires = new \DateTime('+100 seconds');
+        $response = new Response(200, [
+            'Expires' => $expires->format(DATE_RFC1123),
+            'Cache-control' => 'max-age=10',
+        ]);
+
+        $getTtl = $this->getMethod('getTtl');
+        $cache = new CacheStorage(new ArrayCache());
+        $ttl = $getTtl->invokeArgs($cache, [$response]);
+        $this->assertEquals(10, $ttl);
+    }
+
+    /**
+     * Return a protected or private method.
+     *
+     * @param string $name The name of the method.
+     *
+     * @return \ReflectionMethod A method object.
+     */
+    protected static function getMethod($name)
+    {
+        $class = new \ReflectionClass('GuzzleHttp\Subscriber\Cache\CacheStorage');
+        $method = $class->getMethod($name);
+        $method->setAccessible(true);
+
+        return $method;
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/tests/CacheSubscriberTest.php

@@ -0,0 +1,25 @@
+<?php
+namespace GuzzleHttp\Tests\Subscriber\Cache;
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Subscriber\Cache\CacheSubscriber;
+
+class CacheSubscriberTest extends \PHPUnit_Framework_TestCase
+{
+    public function testCreatesAndAttachedDefaultSubscriber()
+    {
+        $client = new Client();
+        $cache = CacheSubscriber::attach($client);
+        $this->assertArrayHasKey('subscriber', $cache);
+        $this->assertArrayHasKey('storage', $cache);
+        $this->assertInstanceOf(
+            'GuzzleHttp\Subscriber\Cache\CacheStorage',
+            $cache['storage']
+        );
+        $this->assertInstanceOf(
+            'GuzzleHttp\Subscriber\Cache\CacheSubscriber',
+            $cache['subscriber']
+        );
+        $this->assertTrue($client->getEmitter()->hasListeners('error'));
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/tests/IntegrationTest.php

@@ -0,0 +1,768 @@
+<?php
+namespace GuzzleHttp\Tests\Subscriber\Cache;
+
+require_once __DIR__ . '/../vendor/guzzlehttp/ringphp/tests/Client/Server.php';
+require_once __DIR__ . '/../vendor/guzzlehttp/guzzle/tests/Server.php';
+
+use GuzzleHttp\Client;
+use GuzzleHttp\Exception\RequestException;
+use GuzzleHttp\Exception\ServerException;
+use GuzzleHttp\Message\RequestInterface;
+use GuzzleHttp\Message\Response;
+use GuzzleHttp\Stream\Stream;
+use GuzzleHttp\Subscriber\Cache\CacheSubscriber;
+use GuzzleHttp\Subscriber\History;
+use GuzzleHttp\Tests\Server;
+
+class IntegrationTest extends \PHPUnit_Framework_TestCase
+{
+    protected function setUp()
+    {
+        Server::start();
+    }
+
+    protected function tearDown()
+    {
+        Server::stop();
+    }
+
+    public function testCachesResponses()
+    {
+        Server::enqueue([
+            new Response(200, [
+                'Vary' => 'Accept-Encoding,Cookie,X-Use-HHVM',
+                'Date' => 'Wed, 29 Oct 2014 20:52:15 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0, must-revalidate',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+                'Age' => '1277'
+            ]),
+            new Response(304, [
+                'Content-Type' => 'text/html; charset=UTF-8',
+                'Vary' => 'Accept-Encoding,Cookie,X-Use-HHVM',
+                'Date' => 'Wed, 29 Oct 2014 20:52:16 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0, must-revalidate',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+                'Age' => '1278'
+            ]),
+            new Response(200, [
+                'Vary' => 'Accept-Encoding,Cookie,X-Use-HHVM',
+                'Date' => 'Wed, 29 Oct 2014 20:52:15 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+                'Age' => '1277'
+            ]),
+            new Response(200, [
+                'Vary' => 'Accept-Encoding,Cookie,X-Use-HHVM',
+                'Date' => 'Wed, 29 Oct 2014 20:53:15 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:53:00 GMT',
+                'Age' => '1277'
+            ]),
+        ]);
+
+        $history = new History();
+        $client = $this->setupClient($history);
+
+        $response1 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+        $response2 = $client->get('/foo');
+        $this->assertEquals(200, $response2->getStatusCode());
+        $last = $history->getLastResponse();
+        $this->assertEquals('HIT from GuzzleCache', $last->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('HIT from GuzzleCache', $last->getHeader('X-Cache'));
+
+        // Validate that expired requests without must-revalidate expire.
+        $response3 = $client->get('/foo');
+        $this->assertEquals(200, $response3->getStatusCode());
+        $response4 = $client->get('/foo');
+        $this->assertEquals(200, $response4->getStatusCode());
+        $last = $history->getLastResponse();
+        $this->assertEquals('MISS from GuzzleCache', $last->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('MISS from GuzzleCache', $last->getHeader('X-Cache'));
+
+        // Validate that all of our requests were received.
+        $this->assertCount(4, Server::received());
+    }
+
+    /**
+     * Test that Warning headers aren't added to cache misses.
+     */
+    public function testCacheMissNoWarning()
+    {
+        Server::enqueue([
+            new Response(200, [
+                'Vary' => 'Accept-Encoding,Cookie,X-Use-HHVM',
+                'Date' => 'Wed, 29 Oct 2014 20:52:15 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0, must-revalidate',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+                'Age' => '1277',
+            ]),
+        ]);
+
+        $client = $this->setupClient();
+        $response = $client->get('/foo');
+        $this->assertFalse($response->hasHeader('warning'));
+    }
+
+    /**
+     * Test that the Vary header creates unique cache entries.
+     *
+     * @throws \Exception
+     */
+    public function testVaryUniqueResponses()
+    {
+        $now = $this->date();
+
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Vary' => 'Accept',
+                    'Content-type' => 'text/html',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                    'Last-Modified' => $now,
+                ], Stream::factory('It works!')
+                ),
+                new Response(
+                    200, [
+                    'Vary' => 'Accept',
+                    'Content-type' => 'application/json',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                    'Last-Modified' => $now,
+                ], Stream::factory(json_encode(['body' => 'It works!']))
+                ),
+            ]
+        );
+
+        $client = $this->setupClient();
+
+        $response1 = $client->get(
+            '/foo',
+            ['headers' => ['Accept' => 'text/html']]
+        );
+        $this->assertEquals('It works!', $this->getResponseBody($response1));
+
+        $response2 = $client->get(
+            '/foo',
+            ['headers' => ['Accept' => 'application/json']]
+        );
+        $this->assertEquals(
+            'MISS from GuzzleCache',
+            $response2->getHeader('x-cache')
+        );
+
+        $decoded = json_decode($this->getResponseBody($response2));
+
+        if (!isset($decoded) || !isset($decoded->body)) {
+            $this->fail('JSON response could not be decoded.');
+        } else {
+            $this->assertEquals('It works!', $decoded->body);
+        }
+    }
+
+    public function testCachesResponsesForWithoutVaryHeader()
+    {
+        $now = $this->date();
+
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Content-type' => 'text/html',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                ], Stream::factory()
+                ),
+                new Response(
+                    200, [
+                    'Content-type' => 'text/html',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                    ], Stream::factory()
+                ),
+            ]
+        );
+
+        $client = $this->setupClient();
+
+        $response1 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+        $response2 = $client->get('/foo');
+        $this->assertEquals(200, $response2->getStatusCode());
+        $this->assertEquals('HIT from GuzzleCache', $response2->getHeader('X-Cache'));
+    }
+
+    /**
+     * Test that requests varying on both Accept and User-Agent properly split
+     * different User-Agents into different cache items.
+     */
+    public function testVaryUserAgent()
+    {
+        $this->setupMultipleVaryResponses();
+        $client = $this->setupClient();
+
+        $response1 = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/1.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'Test/1.0 request.',
+            $this->getResponseBody($response1)
+        );
+
+        $response2 = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'MISS from GuzzleCache',
+            $response2->getHeader('x-cache')
+        );
+        $this->assertEquals(
+            'Test/2.0 request.',
+            $this->getResponseBody($response2)
+        );
+
+        // Test that we get cache hits where both Vary headers match.
+        $response5 = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'HIT from GuzzleCache',
+            $response5->getHeader('x-cache')
+        );
+        $this->assertEquals(
+            'Test/2.0 request.',
+            $this->getResponseBody($response5)
+        );
+    }
+
+    /**
+     * Test that requests varying on Accept but not User-Agent return different responses.
+     */
+    public function testVaryAccept()
+    {
+        $this->setupMultipleVaryResponses();
+        $client = $this->setupClient();
+
+        // Prime the cache.
+        $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/1.0',
+                ]
+            ]
+        );
+        $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+
+        $response1 = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'application/json',
+                    'User-Agent' => 'Testing/1.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'MISS from GuzzleCache',
+            $response1->getHeader('x-cache')
+        );
+        $this->assertEquals(
+            'Test/1.0 request.',
+            json_decode($this->getResponseBody($response1))->body
+        );
+
+        $response2 = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'application/json',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'MISS from GuzzleCache',
+            $response2->getHeader('x-cache')
+        );
+        $this->assertEquals(
+            'Test/2.0 request.',
+            json_decode($this->getResponseBody($response2))->body
+        );
+    }
+
+    /**
+     * Test that we return cached responses when multiple Vary headers match.
+     */
+    public function testMultipleVaryMatch()
+    {
+        $this->setupMultipleVaryResponses();
+        $client = $this->setupClient();
+
+        // Prime the cache.
+        $client->get('/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/1.0',
+                ]
+            ]
+        );
+        $client->get('/foo',
+            [
+                'headers' => [
+                    'Accept' => 'text/html',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+        $client->get('/foo',
+            [
+                'headers' => [
+                    'Accept' => 'application/json',
+                    'User-Agent' => 'Testing/1.0',
+                ]
+            ]
+        );
+        $client->get('/foo',
+            [
+                'headers' => [
+                    'Accept' => 'application/json',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+
+        $response = $client->get(
+            '/foo',
+            [
+                'headers' => [
+                    'Accept' => 'application/json',
+                    'User-Agent' => 'Testing/2.0',
+                ]
+            ]
+        );
+        $this->assertEquals(
+            'HIT from GuzzleCache',
+            $response->getHeader('x-cache')
+        );
+        $this->assertEquals(
+            'Test/2.0 request.',
+            json_decode($this->getResponseBody($response))->body
+        );
+    }
+
+    /**
+     * Test that stale responses are used on errors if allowed.
+     */
+    public function testOnErrorStaleResponse()
+    {
+        $now = $this->date();
+
+        Server::enqueue([
+            new Response(200, [
+                'Date' => $now,
+                'Cache-Control' => 'private, max-age=0, must-revalidate, stale-if-error=666',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+            ], Stream::factory('It works!')),
+            new Response(503, [
+                'Date' => $now,
+                'Cache-Control' => 'private, s-maxage=0, max-age=0, must-revalidate',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+                'Age' => '1277'
+            ]),
+        ]);
+
+        $client = $this->setupClient();
+
+        // Prime the cache.
+        $response1 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+
+        // This should return the first request.
+        $response2 = $client->get('/foo');
+        $this->assertEquals(200, $response2->getStatusCode());
+        $this->assertEquals('It works!', $this->getResponseBody($response2));
+        $this->assertEquals('HIT_ERROR from GuzzleCache', $response2->getHeader('x-cache'));
+        $this->assertCount(2, Server::received());
+    }
+
+    /**
+     * Test that expired stale responses aren't returned.
+     */
+    public function testOnErrorStaleResponseExpired()
+    {
+        // These dates are in the past, so the responses will be expired.
+        Server::enqueue([
+            new Response(200, [
+                'Date' => 'Wed, 29 Oct 2014 20:52:15 GMT',
+                'Cache-Control' => 'private, max-age=0, must-revalidate, stale-if-error=10',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+            ]),
+            new Response(503, [
+                'Date' => 'Wed, 29 Oct 2014 20:55:15 GMT',
+                'Cache-Control' => 'private, s-maxage=0, max-age=0, must-revalidate',
+                'Last-Modified' => 'Wed, 29 Oct 2014 20:30:57 GMT',
+            ]),
+        ]);
+
+        $client = $this->setupClient();
+
+        // Prime the cache.
+        $response1 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+        $this->assertEquals('Wed, 29 Oct 2014 20:52:15 GMT', $response1->getHeader('Date'));
+
+        try {
+            $client->get('/foo');
+            $this->fail('503 was not thrown with an expired cache entry.');
+        } catch (ServerException $e) {
+            $this->assertEquals(503, $e->getCode());
+            $this->assertEquals('Wed, 29 Oct 2014 20:55:15 GMT', $e->getResponse()->getHeader('Date'));
+            $this->assertCount(2, Server::received());
+        }
+    }
+
+    /**
+     * Test that the can_cache option can modify cache behaviour.
+     */
+    public function testCanCache()
+    {
+        $now = $this->date();
+
+        // Return an uncacheable response, that is then cached by can_cache
+        // returning TRUE.
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Date' => $now,
+                    'Cache-Control' => 'private, max-age=0, no-cache',
+                    'Last-Modified' => $now,
+                ], Stream::factory('It works!')),
+                new Response(
+                    304, [
+                    'Date' => $now,
+                    'Cache-Control' => 'private, max-age=0, no-cache',
+                    'Last-Modified' => $now,
+                    'Age' => 0,
+                ]),
+            ]
+        );
+
+        $client = new Client(['base_url' => Server::$url]);
+        CacheSubscriber::attach(
+            $client,
+            [
+                'can_cache' => function (RequestInterface $request) {
+                    return true;
+                }
+            ]
+        );
+
+        $response1 = $client->get('/foo');
+        $this->assertEquals('MISS from GuzzleCache', $response1->getHeader('X-Cache-Lookup'));
+        $response2 = $client->get('/foo');
+        $this->assertEquals('HIT from GuzzleCache', $response2->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('It works!', $this->getResponseBody($response2));
+    }
+
+    /**
+     * Test that PURGE can delete cached responses.
+     */
+    public function testCanPurge()
+    {
+        $now = $this->date();
+
+        // Return a cached response that is then purged, and requested again
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=60',
+                    'Last-Modified' => $now,
+                ], Stream::factory('It is foo!')),
+                new Response(
+                    200, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=60',
+                    'Last-Modified' => $now,
+                ], Stream::factory('It is bar!')),
+            ]
+        );
+
+        $client = $this->setupClient();
+
+        $response1 = $client->get('/foo');
+        $this->assertEquals('MISS from GuzzleCache', $response1->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('It is foo!', $this->getResponseBody($response1));
+
+        $response2 = $client->get('/foo');
+        $this->assertEquals('HIT from GuzzleCache', $response2->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('It is foo!', $this->getResponseBody($response2));
+
+        $response3 = $client->send($client->createRequest('PURGE', '/foo'));
+        $this->assertEquals(204, $response3->getStatusCode());
+
+        $response4 = $client->get('/foo');
+        $this->assertEquals('MISS from GuzzleCache', $response4->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('It is bar!', $this->getResponseBody($response4));
+    }
+
+    /**
+     * Test that cache entries are deleted when a response 404s.
+     */
+    public function test404CacheDelete()
+    {
+        $this->fourXXCacheDelete(404);
+    }
+
+    /**
+     * Test that cache entries are deleted when a response 410s.
+     */
+    public function test410CacheDelete()
+    {
+        $this->fourXXCacheDelete(410);
+    }
+
+    /**
+     * Test the resident_time calculation (RFC7234 4.2.3)
+     */
+    public function testAgeIsIncremented()
+    {
+        Server::enqueue([
+            new Response(200, [
+                'Date' => $this->date(),
+                'Cache-Control' => 'public, max-age=60',
+                'Age' => '59'
+            ], Stream::factory('Age is 59!')),
+            new Response(200, [
+                'Date' => $this->date(),
+                'Cache-Control' => 'public, max-age=60',
+                'Age' => '0'
+            ], Stream::factory('It works!')),
+        ]);
+
+        $client = $this->setupClient();
+
+        // First request : the response is cached
+        $response1 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+        $this->assertEquals('MISS from GuzzleCache', $response1->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('Age is 59!', $this->getResponseBody($response1));
+
+        // Second request : cache hit, age is now 60
+        sleep(1);
+        $response2 = $client->get('/foo');
+        $this->assertEquals(200, $response1->getStatusCode());
+        $this->assertEquals('HIT from GuzzleCache', $response2->getHeader('X-Cache-Lookup'));
+
+        // This request should not be valid anymore : age is 59 + 2 = 61 which is strictly greater than 60
+        sleep(1);
+        $response3 = $client->get('/foo');
+        $this->assertEquals(200, $response3->getStatusCode());
+        $this->assertEquals('MISS from GuzzleCache', $response3->getHeader('X-Cache-Lookup'));
+        $this->assertEquals('It works!', $this->getResponseBody($response3));
+
+        $this->assertCount(2, Server::received());
+    }
+
+    /**
+     * Decode a response body from TestServer.
+     *
+     * TestServer encodes all responses with base64, so we need to decode them
+     * before we can do any assert's on them.
+     *
+     * @param Response $response The response with a body to decode.
+     *
+     * @return string
+     */
+    private function getResponseBody($response)
+    {
+        return base64_decode($response->getBody());
+    }
+
+    /**
+     * Set up responses used by our Vary tests.
+     *
+     * @throws \Exception
+     */
+    private function setupMultipleVaryResponses()
+    {
+        $now = $this->date();
+
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Vary' => 'Accept, User-Agent',
+                    'Content-type' => 'text/html',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                    'Last-Modified' => $now,
+                ], Stream::factory('Test/1.0 request.')
+                ),
+                new Response(
+                    200,
+                    [
+                        'Vary' => 'Accept, User-Agent',
+                        'Content-type' => 'text/html',
+                        'Date' => $now,
+                        'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                        'Last-Modified' => $now,
+                    ],
+                    Stream::factory('Test/2.0 request.')
+                ),
+                new Response(
+                    200, [
+                    'Vary' => 'Accept, User-Agent',
+                    'Content-type' => 'application/json',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                    'Last-Modified' => $now,
+                ], Stream::factory(json_encode(['body' => 'Test/1.0 request.']))
+                ),
+                new Response(
+                    200, [
+                    'Vary' => 'Accept, User-Agent',
+                    'Content-type' => 'application/json',
+                    'Date' => $now,
+                    'Cache-Control' => 'public, s-maxage=1000, max-age=1000',
+                    'Last-Modified' => $now,
+                ], Stream::factory(json_encode(['body' => 'Test/2.0 request.']))
+                ),
+            ]
+        );
+    }
+
+    /**
+     * Setup a Guzzle client for testing.
+     *
+     * @param History $history (optional) parameter of a History to track
+     *                         requests in.
+     *
+     * @return Client A client ready to run test requests against.
+     */
+    private function setupClient(History $history = null)
+    {
+        $client = new Client(['base_url' => Server::$url]);
+        CacheSubscriber::attach($client);
+        if ($history) {
+            $client->getEmitter()->attach($history);
+        }
+
+        return $client;
+    }
+
+    /**
+     * Return a date string suitable for using in an HTTP header.
+     *
+     * @param int $timestamp (optional) A Unix timestamp to generate the date.
+     *
+     * @return string The generated date string.
+     */
+    private function date($timestamp = null)
+    {
+        if (!$timestamp) {
+            $timestamp = time();
+        }
+
+        return gmdate("D, d M Y H:i:s", $timestamp) . ' GMT';
+    }
+
+    /**
+     * Helper to test that a 400 response deletes cache entries.
+     *
+     * @param int $errorCode The error code to test, such as 404 or 410.
+     *
+     * @throws \Exception
+     */
+    private function fourXXCacheDelete($errorCode)
+    {
+        $now = $this->date();
+
+        Server::enqueue(
+            [
+                new Response(
+                    200, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                ]
+                ),
+                new Response(
+                    304, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                    'Age' => 0,
+                ]
+                ),
+                new Response(
+                    $errorCode, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                ]
+                ),
+                new Response(
+                    200, [
+                    'Date' => $now,
+                    'Cache-Control' => 'public, max-age=1000, must-revalidate',
+                    'Last-Modified' => $now,
+                ]
+                ),
+            ]
+        );
+
+        $client = $this->setupClient();
+        $response1 = $client->get('/foo');
+        $this->assertEquals('MISS from GuzzleCache', $response1->getHeader('X-Cache-Lookup'));
+        $response2 = $client->get('/foo');
+        $this->assertEquals('HIT from GuzzleCache', $response2->getHeader('X-Cache-Lookup'));
+
+        try {
+            $client->get('/foo');
+            $this->fail($errorCode . ' was not thrown.');
+        } catch (RequestException $e) {
+            $response3 = $e->getResponse();
+            $this->assertEquals($errorCode, $response3->getStatusCode());
+            $this->assertEquals('MISS from GuzzleCache', $response3->getHeader('X-Cache-Lookup'));
+        }
+
+        $response4 = $client->get('/foo');
+        $this->assertEquals('MISS from GuzzleCache', $response4->getHeader('X-Cache-Lookup'));
+    }
+}

modules/productcomments/vendor/guzzlehttp/cache-subscriber/tests/UtilsTest.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace GuzzleHttp\Subscriber\Cache;
+
+use GuzzleHttp\Message\MessageFactory;
+use PHPUnit_Framework_TestCase;
+
+/**
+ * Test the Utils class.
+ *
+ * @class UtilsTest
+ */
+class UtilsTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * Test that a max-age of zero isn't returned as null.
+     */
+    public function testGetMaxAgeZero()
+    {
+        $messageFactory = new MessageFactory();
+        $response = $messageFactory->createResponse(200, ['Cache-Control' => 's-maxage=0']);
+        $this->assertSame(0, Utils::getMaxAge($response));
+
+        $response = $messageFactory->createResponse(200, ['Cache-Control' => 'max-age=0']);
+        $this->assertSame(0, Utils::getMaxAge($response));
+
+        $response = $messageFactory->createResponse(200, ['Expires' => gmdate('D, d M Y H:i:s') . ' GMT']);
+        $this->assertLessThanOrEqual(0, Utils::getMaxAge($response));
+    }
+
+    /**
+     * Test that a response with no max-age information returns null.
+     */
+    public function testGetMaxAgeNull()
+    {
+        $messageFactory = new MessageFactory();
+        $response = $messageFactory->createResponse(200);
+        $this->assertSame(null, Utils::getMaxAge($response));
+    }
+
+    /**
+     * Test that a response that is zero fresh returns zero and not null.
+     */
+    public function testGetFreshnessZero()
+    {
+        $messageFactory = new MessageFactory();
+        $response = $messageFactory->createResponse(200,
+            [
+                'Cache-Control' => 'max-age=0',
+                'Age' => 0,
+            ]);
+
+        $this->assertSame(0, Utils::getFreshness($response));
+    }
+
+    /**
+     * Test that responses that can't have freshness determined return null.
+     */
+    public function testGetFreshnessNull()
+    {
+        $messageFactory = new MessageFactory();
+        $response = $messageFactory->createResponse(200);
+        $this->assertSame(null, Utils::getFreshness($response));
+    }
+}