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<?php |
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namespace BringYourOwnIdeas\Maintenance\Util; |
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use BringYourOwnIdeas\Maintenance\Model\Package; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Exception\GuzzleException; |
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use GuzzleHttp\Psr7\Request; |
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use GuzzleHttp\Psr7\Response; |
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use Psr\SimpleCache\CacheInterface; |
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use RuntimeException; |
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use SilverStripe\Core\Convert; |
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use SilverStripe\Core\Extensible; |
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use SilverStripe\Core\Injector\Injector; |
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/** |
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* Handles fetching supported addon details from addons.silverstripe.org |
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*/ |
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abstract class ApiLoader |
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{ |
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use Extensible; |
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private static $dependencies = [ |
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'GuzzleClient' => '%$' . Client::class, |
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]; |
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/** |
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* @var Client |
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*/ |
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protected $guzzleClient; |
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/** |
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* @var CacheInterface |
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*/ |
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protected $cache; |
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/** |
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* Define a unique cache key for results to be saved for each request (subclass) |
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* |
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* @return string |
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*/ |
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abstract protected function getCacheKey(); |
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/** |
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* Perform an HTTP request for module health information |
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* |
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* @param string $endpoint API endpoint to check for results |
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* @param callable $callback Function to return the result of after loading the API data |
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* @return array |
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* @throws RuntimeException When the API responds with something that's not module health information |
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*/ |
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public function doRequest($endpoint, callable $callback) |
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{ |
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// Check for a cached value and return if one is available |
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if ($result = $this->getFromCache()) { |
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return $result; |
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} |
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// Otherwise go and request data from the API |
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$request = new Request('GET', $endpoint); |
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$failureMessage = 'Could not obtain information about module. '; |
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try { |
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/** @var Response $response */ |
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$response = $this->getGuzzleClient()->send($request, $this->getClientOptions()); |
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} catch (GuzzleException $exception) { |
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throw new RuntimeException($failureMessage); |
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} |
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if ($response->getStatusCode() !== 200) { |
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throw new RuntimeException($failureMessage . 'Error code ' . $response->getStatusCode()); |
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} |
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if (!in_array('application/json', $response->getHeader('Content-Type'))) { |
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throw new RuntimeException($failureMessage . 'Response is not JSON'); |
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} |
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$responseBody = Convert::json2array($response->getBody()->getContents()); |
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if (empty($responseBody)) { |
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throw new RuntimeException($failureMessage . 'Response could not be parsed'); |
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} |
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if (!isset($responseBody['success']) || !$responseBody['success']) { |
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throw new RuntimeException($failureMessage . 'Response returned unsuccessfully'); |
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} |
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// Allow callback to handle processing of the response body |
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$result = $callback($responseBody); |
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// Setting the value to the cache for subsequent requests |
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$this->handleCacheFromResponse($response, $result); |
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return $result; |
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} |
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/** |
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* @return Client |
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*/ |
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public function getGuzzleClient() |
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{ |
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return $this->guzzleClient; |
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} |
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/** |
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* @param Client $guzzleClient |
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* @return $this |
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*/ |
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public function setGuzzleClient(Client $guzzleClient) |
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{ |
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$this->guzzleClient = $guzzleClient; |
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return $this; |
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} |
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/** |
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* Get Guzzle client options |
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* |
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* @return array |
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*/ |
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public function getClientOptions() |
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{ |
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$options = [ |
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'http_errors' => false, |
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]; |
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$this->extend('updateClientOptions', $options); |
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return $options; |
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} |
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/** |
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* Attempts to load something from the cache and deserializes from JSON if successful |
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* |
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* @return array|bool |
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* @throws \Psr\SimpleCache\InvalidArgumentException |
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*/ |
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protected function getFromCache() |
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{ |
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$cacheKey = $this->getCacheKey(); |
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$result = $this->getCache()->get($cacheKey, false); |
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if ($result === false) { |
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return false; |
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} |
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// Deserialize JSON object and return as an array |
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return Convert::json2array($result); |
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} |
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/** |
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* Given a value, set it to the cache with the given key after serializing the value as JSON |
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* |
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* @param string $cacheKey |
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* @param mixed $value |
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* @param int $ttl |
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* @return bool |
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* @throws \Psr\SimpleCache\InvalidArgumentException |
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*/ |
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protected function setToCache($cacheKey, $value, $ttl = null) |
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{ |
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// Seralize as JSON to ensure array etc can be stored |
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$value = Convert::raw2json($value); |
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return $this->getCache()->set($cacheKey, $value, $ttl); |
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} |
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/** |
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* Check the API response for cache control headers and respect them internally in the SilverStripe |
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* cache if found |
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* |
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* @param Response $response |
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* @param array|string $result |
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* @throws \Psr\SimpleCache\InvalidArgumentException |
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*/ |
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protected function handleCacheFromResponse(Response $response, $result) |
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{ |
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// Handle caching if requested |
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if ($cacheControl = $response->getHeader('Cache-Control')) { |
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// Combine separate header rows |
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$cacheControl = implode(', ', $cacheControl); |
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if (strpos($cacheControl, 'no-store') === false |
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&& preg_match('/(?:max-age=)(\d+)/i', $cacheControl, $matches) |
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) { |
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$duration = (int) $matches[1]; |
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$cacheKey = $this->getCacheKey(); |
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$this->setToCache($cacheKey, $result, $duration); |
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} |
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} |
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} |
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/** |
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* @return CacheInterface |
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*/ |
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public function getCache() |
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{ |
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if (!$this->cache) { |
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$this->cache = Injector::inst()->get(CacheInterface::class . '.silverstripeMaintenance'); |
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} |
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return $this->cache; |
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} |
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/** |
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* @param CacheInterface $cache |
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* @return $this |
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*/ |
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public function setCache(CacheInterface $cache) |
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{ |
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$this->cache = $cache; |
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return $this; |
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} |
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/** |
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* Create a request with some standard headers |
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* |
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* @param string $uri |
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* @param string $method |
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* @return Request |
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*/ |
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protected function createRequest($uri, $method = 'GET') |
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{ |
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$headers = []; |
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$version = $this->resolveVersion(); |
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if (!empty($version)) { |
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$headers['Silverstripe-Framework-Version'] = $version; |
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} |
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return new Request($method, $uri, $headers); |
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} |
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/** |
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* Resolve the framework version of SilverStripe. |
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* |
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* @return string|null |
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*/ |
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protected function resolveVersion() |
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{ |
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$frameworkPackage = Package::get()->find('Name', 'silverstripe/framework'); |
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if (!$frameworkPackage) { |
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return null; |
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} |
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return $frameworkPackage->Version; |
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} |
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} |
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