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<?php |
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namespace Werk365\EtagConditionals\Middleware; |
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use Closure; |
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use Illuminate\Http\Request; |
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use Illuminate\Http\Response; |
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use Werk365\EtagConditionals\EtagConditionals; |
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class IfMatch extends Middleware |
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{ |
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public string $middleware = 'ifMatch'; |
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/** |
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* Handle an incoming request. |
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* |
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* @param \Illuminate\Http\Request $request |
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* @param \Closure $next |
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* @return mixed |
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*/ |
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public function handle(Request $request, Closure $next) |
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{ |
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// Next unless method is PATCH and If-Match header is set |
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if (! ($request->isMethod('PATCH') && $request->hasHeader('If-Match'))) { |
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return $next($request); |
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} |
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// Create new GET request to same endpoint, |
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// copy headers and add header that allows you to ignore this request in middlewares |
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$getRequest = Request::create($request->getRequestUri(), 'GET'); |
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$getRequest->headers = $request->headers; |
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$getRequest->headers->set('X-From-Middleware', 'IfMatch'); |
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$getResponse = app()->handle($getRequest); |
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// Get content from response object and get hashes from content and etag |
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$getEtag = EtagConditionals::getEtag($request, $getResponse); |
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$ifMatch = $request->header('If-Match'); |
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if ($ifMatch === null) { |
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return response(null, 412); |
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} |
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$ifMatchArray = (is_string($ifMatch)) ? |
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explode(',', $ifMatch) : |
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$ifMatch; |
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// Strip W/ if weak comparison algorithm can be used |
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if (config('etagconditionals.if_match_weak')) { |
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foreach ($ifMatchArray as &$match) { |
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$match = str_replace('W/', '', $match); |
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} |
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unset($match); |
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} |
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foreach ($ifMatchArray as &$match) { |
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$match = trim($match); |
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} |
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unset($match); |
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// Compare current and request hashes |
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// Also allow wildcard (*) values |
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if (! (in_array($getEtag, $ifMatchArray) || in_array('"*"', $ifMatchArray))) { |
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return response(null, 412); |
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} |
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// Before continuing, prepare the application to receive our request |
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// This is for Laravel Octane support |
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app()->instance('request', $request); |
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return $next($request); |
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} |
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} |
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