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<?php |
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namespace Krenor\Http2Pusher; |
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use Illuminate\Http\Request; |
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use Illuminate\Support\Collection; |
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use Symfony\Component\HttpFoundation\Cookie; |
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class Builder |
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{ |
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/** |
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* The current request to read the cookie from. |
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* |
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* @var Request |
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*/ |
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protected $request; |
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/** |
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* Additional cookie and global pushable resources settings. |
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* |
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* @var array |
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*/ |
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protected $settings; |
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/** |
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* The supported extensions to push. |
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* |
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* @var array |
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*/ |
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protected $extensionTypes = [ |
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'css' => 'style', |
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'js' => 'script', |
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'ttf' => 'font', |
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'otf' => 'font', |
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'woff' => 'font', |
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'woff2' => 'font', |
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'eot' => 'font', |
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'jpeg' => 'image', |
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'jpg' => 'image', |
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'png' => 'image', |
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'gif' => 'image', |
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'bmp' => 'image', |
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'svg' => 'image', |
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]; |
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/** |
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* Builder constructor. |
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* |
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* @param Request $request |
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* @param array $settings |
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*/ |
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public function __construct(Request $request, array $settings) |
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{ |
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$this->request = $request; |
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$this->settings = $settings; |
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} |
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/** |
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* Build the HTTP2 Push link and cache digest cookie. |
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* |
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* @see https://w3c.github.io/preload/#server-push-(http/2) |
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* |
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* @param array $resources |
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* |
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* @return Http2Push|null |
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*/ |
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public function prepare(array $resources) |
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{ |
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$supported = collect($resources) |
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->merge($this->settings['global_pushes']) |
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->filter(function ($resource) { |
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return array_key_exists($this->getExtension($resource), $this->extensionTypes); |
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}); |
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if ($supported->count() < 1) { |
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return null; |
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} |
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$transformed = $this->transform($supported); |
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$cookie = $this->request->cookie($this->settings['cookie']['name']); |
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$pushable = $this->processCookieCache($transformed, $cookie); |
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if ($pushable->count() < 1) { |
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return null; |
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} |
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$link = $this->buildLink($pushable); |
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$cookie = new Cookie( |
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$this->settings['cookie']['name'], |
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$transformed->toJson(), |
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strtotime("+{$this->settings['cookie']['duration']}") |
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); |
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return new Http2Push($pushable, $cookie, $link); |
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} |
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/** |
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* Transform the resources to include a pushable type. |
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* |
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* @param Collection $collection |
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* |
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* @return Collection |
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*/ |
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private function transform(Collection $collection): Collection |
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{ |
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return $collection->map(function ($path) { |
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$hash = $this->retrieveHash($path); |
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$extension = $this->getExtension($path); |
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$type = $this->extensionTypes[$extension]; |
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return compact('path', 'type', 'hash'); |
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}); |
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} |
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/** |
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* Generate or get a hash of a file. |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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private function retrieveHash(string $path): string |
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{ |
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$pieces = parse_url($path); |
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// External url |
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if (isset($pieces['host'])) { |
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return substr(hash_file('md5', $path), 0, 12); |
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} |
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// TODO: Might want to check for additional version strings other than Mixs'. |
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preg_match('/id=([a-f0-9]{20})/', $path, $matches); |
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if (last($matches)) { |
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return substr(last($matches), 0, 12); |
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} |
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return substr(hash_file('md5', public_path($path)), 0, 12); |
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} |
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/** |
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* Get the extension of a file and remove query parameters. |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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private function getExtension($path): string |
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{ |
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return strtok( |
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pathinfo($path, PATHINFO_EXTENSION), |
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'?' |
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); |
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} |
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/** |
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* Check which resources already are cached. |
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* |
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* @param Collection $pushable |
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* @param string|null $cache |
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* |
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* @return Collection |
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*/ |
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private function processCookieCache(Collection $pushable, $cache = null): Collection |
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{ |
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if ($cache === null) { |
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return $pushable; |
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} |
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if ($cache === $pushable->toJson()) { |
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return collect(); |
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} |
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$cached = json_decode($cache, true); |
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return $pushable->filter(function ($item) use ($cached) { |
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return !in_array($item, $cached); |
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}); |
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} |
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/** |
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* Create the HTTP2 Server Push link. |
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* |
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* @param Collection $pushable |
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* |
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* @return string |
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*/ |
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private function buildLink(Collection $pushable): string |
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{ |
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return $pushable->map(function ($item) { |
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$push = "<{$item['path']}>; rel=preload; as={$item['type']}"; |
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if ($item['type'] === 'font') { |
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return "{$push}; crossorigin"; |
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} |
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return $push; |
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})->implode(','); |
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} |
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} |
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krenor /
http2-pusher
