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<?php // ini_set('display_errors', 1); // error_reporting((E_ALL \| E_STRICT) ^ E_NOTICE); define('VARNISH_DEVELOPER_MODE', false); define('VARNISH_GENERIC_CONTROLLER_VERSION', '0.0.1'); $currentUser = get_current_user(); $currentDirectory = sprintf('%s/', rtrim(dirname(__FILE__), '/')); $settingsFile = sprintf('%s/settings.json', rtrim($currentDirectory, '/')); $logDirectory = sprintf('/home/%s/logs/varnish-cache/', $currentUser); $varnishPurgeLogfile = sprintf('%s/purge.log', rtrim($logDirectory, '/')); class ClpVarnish { private $enabled = false; private $developerMode = false; private $purgeLogfile = ''; private $server = ''; private $isCacheable = true; static private $cacheTagPrefix = ''; static private $cacheLifetime = 0; static private $cacheTags = []; private $excludes = []; private $excludedParams = []; static private $queuedPurges = []; public function setEnabled($flag): void { $this->enabled = (bool)$flag; } public function isEnabled(): bool { return $this->enabled; } public function setDeveloperMode($flag): void { $this->developerMode = (bool)$flag; } public function isDeveloperMode(): bool { return $this->developerMode; } public function setPurgeLogfile($purgeLogfile): void { $this->purgeLogfile = $purgeLogfile; } public function getPurgeLogfile(): string { return $this->purgeLogfile; } static public function setCacheTagPrefix($cacheTagPrefix): void { self::$cacheTagPrefix = $cacheTagPrefix; } static public function getCacheTagPrefix(): string { return self::$cacheTagPrefix; } static public function setCacheLifetime($cacheLifetime): void { self::$cacheLifetime = $cacheLifetime; } static public function getCacheLifetime(): int { return self::$cacheLifetime; } static public function addCacheTag($cacheTag): void { self::$cacheTags[] = $cacheTag; } public function getCacheTags(): array { return self::$cacheTags; } public function setServer($server): void { $this->server = $server; } public function getServer(): ?string { return $this->server; } public function setExcludes(array $excludes): void { $this->excludes = $excludes; } public function getExcludes(): array { return $this->excludes; } public function setExcludedParams(array $excludedParams): void { $this->excludedParams = $excludedParams; } public function getExcludedParams(): array { return $this->excludedParams; } public function setIsCacheable($flag): void { $this->isCacheable = $flag; } public function isCacheable(): bool { if (true === $this->isCacheable) { $isEnabled = $this->isEnabled(); if (false === $isEnabled) { return false; } $cacheLifetime = self::getCacheLifetime(); if (0 === $cacheLifetime) { return false; } if (false === empty($_POST)) { return false; } $excludedParams = (array)$this->getExcludedParams(); if (false === empty($excludedParams)) { foreach ($excludedParams as $excludedParam) { if (true === isset($_GET[$excludedParam])) { return false; } } } $excludes = $this->getExcludes(); $requestUri = (true === isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : ''); if (false === empty($excludes) && false === empty($requestUri)) { foreach ($excludes as $exclude) { $exclude = trim($exclude); if (true === isset($exclude[0]) && '^' == $exclude[0]) { $exclude = substr($exclude, 1); if (substr($requestUri, 0, strlen($exclude)) === $exclude) { return false; } } else { if (strpos($requestUri, $exclude) !== false) { return false; } } } } return true; } return false; } public function addTagsToPurge(array $tags) { if (count($tags)) { foreach ($tags as $tag) { self::$queuedPurges['tags'][] = $tag; } } } private function purge(array $headers): void { try { $server = $this->getServer(); $curlOptionList = [ CURLOPT_URL => $server, CURLOPT_HTTPHEADER => $headers, CURLOPT_CUSTOMREQUEST => 'PURGE', CURLOPT_VERBOSE => true, CURLOPT_RETURNTRANSFER => true, CURLOPT_NOBODY => true, CURLOPT_CONNECTTIMEOUT_MS => 2000, ]; $curlHandler = curl_init(); curl_setopt_array($curlHandler, $curlOptionList); curl_exec($curlHandler); curl_close($curlHandler); } catch (\Exception $e) { $errorMessage = $e->getMessage(); echo sprintf('Varnish Cache Purge Failed, Error Message: %s', $errorMessage); } } public function sendCacheHeaders(): void { $isCacheable = $this->isCacheable(); if (true === $isCacheable) { $cacheTagPrefix = $this->getCacheTagPrefix(); $cacheLifetime = $this->getCacheLifetime(); $cacheTags = array_merge([$cacheTagPrefix], self::getCacheTags()); $cacheTags = array_unique($cacheTags); if (count($cacheTags)) { header(sprintf('X-Cache-Lifetime: %s', $cacheLifetime)); header(sprintf('X-Cache-Tags: %s', implode(',', $cacheTags))); header(sprintf('Pragma: %s', 'cache')); header(sprintf('Cache-Control: public, max-age=%s, s-maxage=%s', $cacheLifetime, $cacheLifetime)); } } } public function shutdownPurge(): void { if (count(self::$queuedPurges)) { if (true === isset(self::$queuedPurges['tags']) && false === empty(self::$queuedPurges['tags'])) { $tags = array_filter(array_unique(self::$queuedPurges['tags'])); $headers = [ sprintf('X-Cache-Tags: %s', implode(',', $tags)) ]; $this->purge($headers); $this->logPurge($tags); } } } private function logPurge(array $data) { $isDeveloperMode = $this->isDeveloperMode(); if (true === $isDeveloperMode) { $dateTime = new \DateTime('now', new \DateTimeZone('UTC')); $logMessage = sprintf('%s, %s', $dateTime->format('Y-m-d H:i:s'), print_r($data, true)); $purgeLogfile = $this->getPurgeLogfile(); file_put_contents($purgeLogfile, $logMessage.PHP_EOL, FILE_APPEND \| LOCK_EX); } } } if (true === file_exists($settingsFile)) { if (false === file_exists($logDirectory)) { @mkdir($logDirectory, 0770, true); } $settings = json_decode(file_get_contents($settingsFile), true); $varnishEnabled = (true === isset($settings['enabled']) && true === $settings['enabled'] ? true : false); $varnishServer = (true === isset($settings['server']) ? $settings['server'] : ''); $varnishCacheTagPrefix = (true === isset($settings['cacheTagPrefix']) ? $settings['cacheTagPrefix'] : ''); $varnishCacheLifetime = (true === isset($settings['cacheLifetime']) ? (int)$settings['cacheLifetime'] : 0); $varnishCacheExcludes = (true === isset($settings['excludes']) && true === is_array($settings['excludes']) ? $settings['excludes'] : []); $varnishCacheExcludedParams = (true === isset($settings['excludedParams']) && true === is_array($settings['excludedParams']) ? $settings['excludedParams'] : []); $clpVarnish = new ClpVarnish(); $clpVarnish->setEnabled($varnishEnabled); $clpVarnish->setDeveloperMode(VARNISH_DEVELOPER_MODE); $clpVarnish->setPurgeLogfile($varnishPurgeLogfile); $clpVarnish->setServer($varnishServer); $clpVarnish->setCacheTagPrefix($varnishCacheTagPrefix); $clpVarnish->setCacheLifetime($varnishCacheLifetime); $clpVarnish->setExcludes($varnishCacheExcludes); $clpVarnish->setExcludedParams($varnishCacheExcludedParams); $headerRegisterCallback = function() use ($clpVarnish) { $cacheTagPrefix = $clpVarnish->getCacheTagPrefix(); $clpVarnish->sendCacheHeaders(); }; $registerShutdownCallback = function() use ($clpVarnish) { $cacheTagPrefix = $clpVarnish->getCacheTagPrefix(); $clpVarnish->shutdownPurge(); }; header_register_callback($headerRegisterCallback); register_shutdown_function($registerShutdownCallback); }

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