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<?php |
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/* |
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* janitor (http://juliangut.com/janitor). |
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* Effortless maintenance management. |
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* |
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* @license BSD-3-Clause |
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* @link https://github.com/juliangut/janitor |
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* @author Julián Gutiérrez <[email protected]> |
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*/ |
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namespace Janitor\Handler; |
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use Janitor\Watcher\ScheduledWatcherInterface; |
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use Janitor\Watcher\WatcherInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Zend\Diactoros\Stream; |
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/** |
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* HTML render maintenance handler. |
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*/ |
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class Render implements HandlerInterface |
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{ |
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/** |
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* Known handled content types. |
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* |
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* @var array |
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*/ |
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protected $knownContentTypes = [ |
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'text/html', |
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'text/json', |
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'application/json', |
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'text/xml', |
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'application/xml', |
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]; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, WatcherInterface $watcher) |
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{ |
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$content = ''; |
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$contentType = $this->determineContentType($request); |
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switch ($contentType) { |
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case 'text/json': |
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case 'application/json': |
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$content = $this->renderJson($watcher); |
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break; |
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case 'text/xml': |
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case 'application/xml': |
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$content = $this->renderXml($watcher); |
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break; |
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case 'text/html': |
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$content = $this->renderHtml($watcher); |
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break; |
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} |
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$body = new Stream('php://temp', 'r+'); |
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$body->write($content); |
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if ($watcher instanceof ScheduledWatcherInterface) { |
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$response = $response |
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->withHeader('Expires', $watcher->getEnd()->format('D, d M Y H:i:s e')) |
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->withHeader('Retry-After', $watcher->getEnd()->format('D, d M Y H:i:s e')); |
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} else { |
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$response = $response->withHeader('Cache-Control', 'max-age=0') |
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->withHeader('Cache-Control', 'no-cache, must-revalidate') |
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->withHeader('Pragma', 'no-cache'); |
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} |
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return $response->withStatus(503) |
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->withHeader('Content-Type', $contentType) |
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->withBody($body); |
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} |
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/** |
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* Render HTML maintenance message. |
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* |
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* @param WatcherInterface $watcher |
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* |
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* @return string |
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*/ |
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protected function renderHtml(WatcherInterface $watcher) |
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{ |
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$title = 'Maintenance'; |
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$message = $this->getMaintenanceMessage($watcher); |
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return sprintf( |
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'<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">' . |
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'<title>%s</title><style>body{margin:0;padding:30px;font:12px/1.5 Helvetica,Arial,Verdana,' . |
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'sans-serif;}h1{margin:0;font-size:48px;font-weight:normal;line-height:48px;}strong{' . |
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'display:inline-block;width:65px;}</style></head><body><h1>%s</h1>%s</body></html>', |
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$title, |
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$title, |
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$message |
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); |
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} |
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/** |
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* Render JSON maintenance message. |
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* |
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* @param WatcherInterface $watcher |
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* |
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* @return string |
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*/ |
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protected function renderJson(WatcherInterface $watcher) |
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{ |
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return json_encode(['message' => $this->getMaintenanceMessage($watcher)]); |
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} |
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/** |
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* Render XML maintenance message. |
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* |
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* @param WatcherInterface $watcher |
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* |
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* @return string |
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*/ |
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protected function renderXml(WatcherInterface $watcher) |
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{ |
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return sprintf( |
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'<maintenance><message>%s</message></maintenance>', |
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$this->getMaintenanceMessage($watcher) |
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); |
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} |
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/** |
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* Retrieve custom maintenance message. |
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* |
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* @param WatcherInterface $watcher |
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* |
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* @return string |
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*/ |
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protected function getMaintenanceMessage(WatcherInterface $watcher) |
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{ |
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$message = 'Maintenance mode is not active!'; |
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if ($watcher->isActive()) { |
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$message = $watcher instanceof ScheduledWatcherInterface |
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? 'Undergoing maintenance tasks until ' . $watcher->getEnd()->format('Y/m/d H:i:s') |
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: 'Undergoing maintenance tasks'; |
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} |
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return $message; |
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} |
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/** |
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* Determine content type using Accept header. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return string |
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*/ |
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protected function determineContentType(ServerRequestInterface $request) |
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{ |
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$acceptHeader = $request->getHeaderLine('Accept'); |
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$selectedContentTypes = array_intersect(explode(',', $acceptHeader), $this->knownContentTypes); |
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if (count($selectedContentTypes)) { |
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return current($selectedContentTypes); |
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} |
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if (preg_match('/\+(json|xml)/', $acceptHeader, $matches)) { |
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$mediaType = 'application/' . $matches[1]; |
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if (in_array($mediaType, $this->knownContentTypes, true)) { |
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return $mediaType; |
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} |
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} |
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return $this->knownContentTypes[0]; |
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} |
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} |
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juliangut /
janitor
