<?php namespace Common\Core\Middleware;
use Closure;
use Common\Core\Controllers\HomeController;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
class PrerenderIfCrawler
{
protected array $crawlerUserAgents = [
'Yahoo! Slurp',
'bingbot',
'yandex',
'baiduspider',
'facebookexternalhit',
'twitterbot',
'rogerbot',
'linkedinbot',
'embedly',
'quora link preview',
'showyoubot',
'outbrain',
'pinterest/0.',
'slackbot',
'vkShare',
'W3C_Validator',
'redditbot',
'Applebot',
'WhatsApp',
'flipboard',
'tumblr',
'bitlybot',
'SkypeUriPreview',
'nuzzel',
'Discordbot',
'Qwantify',
'pinterestbot',
'Bitrix link preview',
'XING-contenttabreceiver',
'developers.google.com/+/web/snippet',
];
public function handle(
Request $request,
Closure $next,
string $routeName = null
) {
if ($this->shouldPrerender($request)) {
define('SHOULD_PRERENDER', true);
// Always fallback to client routes if not prerendering
// otherwise prerender routes will override client side routing
} elseif ($routeName !== 'homepage') {
return app(HomeController::class)->show();
}
return $next($request);
}
protected function shouldPrerender(Request $request): bool
{
$userAgent = strtolower($request->server->get('HTTP_USER_AGENT'));
$bufferAgent = $request->server->get('X-BUFFERBOT');
$shouldPrerender = false;
if (!$userAgent) {
return false;
}
if (!$request->isMethod('GET')) {
return false;
}
// prerender if _escaped_fragment_ is in the query string
if ($request->query->has('_escaped_fragment_')) {
$shouldPrerender = true;
}
// prerender if a crawler is detected
foreach ($this->crawlerUserAgents as $crawlerUserAgent) {
if (Str::contains($userAgent, strtolower($crawlerUserAgent))) {
$shouldPrerender = true;
}
}
if ($bufferAgent) {
$shouldPrerender = true;
}
return $shouldPrerender;
}
}