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<?php $accept = [ 'application/ld+json', 'application/json', 'text/html', ]; $selector = new HeaderSelector(); $headers = $selector->selectHeaders($accept, 'application/json', false); $accept = $headers['Accept']; var_dump($accept); /** * HeaderSelector Class Doc Comment * * @category Class * @package OpenAPI\Client * @author OpenAPI Generator team * @link https://openapi-generator.tech */ class HeaderSelector { /** * @param string[] $accept * @param string $contentType * @param bool $isMultipart * @return string[] */ public function selectHeaders(array $accept, string $contentType, bool $isMultipart): array { $headers = []; $accept = $this->selectAcceptHeader($accept); if ($accept !== null) { $headers['Accept'] = $accept; } if (!$isMultipart) { if($contentType === '') { $contentType = 'application/json'; } $headers['Content-Type'] = $contentType; } return $headers; } /** * Return the header 'Accept' based on an array of Accept provided. * * @param string[] $accept Array of header * * @return null|string Accept (e.g. application/json) */ private function selectAcceptHeader(array $accept): ?string { # filter out empty entries $accept = array_filter($accept); if (count($accept) === 0) { return null; } # If there's only one Accept header, just use it if (count($accept) === 1) { return reset($accept); } # If none of the available Accept headers is of type "json", then just use all them $headersWithJson = preg_grep('~(?i)^(application/json|[^;/ \t]+/[^;/ \t]+[+]json)[ \t]*(;.*)?$~', $accept); if (count($headersWithJson) === 0) { return implode(',', $accept); } # If we got here, then we need add quality values (weight), as described in IETF RFC 9110, Items 12.4.2/12.5.1, # to give the highest priority to json-like headers - recalculating the existing ones, if needed return $this->getAcceptHeaderWithAdjustedWeight($accept, $headersWithJson); } /** * Create an Accept header string from the given "Accept" headers array, recalculating all weights * * @param string[] $accept Array of Accept Headers * @param string[] $headersWithJson Array of Accept Headers of type "json" * * @return string "Accept" Header (e.g. "application/json, text/html; q=0.9") */ private function getAcceptHeaderWithAdjustedWeight(array $accept, array $headersWithJson): string { $processedHeaders = [ 'withApplicationJson' => [], 'withJson' => [], 'withoutJson' => [], ]; foreach ($accept as $header) { $headerData = $this->getHeaderAndWeight($header); if (stripos($headerData['header'], 'application/json') === 0) { $processedHeaders['withApplicationJson'][] = $headerData; } elseif (in_array($header, $headersWithJson, true)) { $processedHeaders['withJson'][] = $headerData; } else { $processedHeaders['withoutJson'][] = $headerData; } } $acceptHeaders = []; $currentWeight = 1000; $hasMoreThan28Headers = count($accept) > 28; foreach($processedHeaders as $headers) { if (count($headers) > 0) { $acceptHeaders[] = $this->adjustWeight($headers, $currentWeight, $hasMoreThan28Headers); } } $acceptHeaders = array_merge(...$acceptHeaders); return implode(',', $acceptHeaders); } /** * Given an Accept header, returns an associative array splitting the header and its weight * * @param string $header "Accept" Header * * @return array with the header and its weight */ private function getHeaderAndWeight(string $header): array { # matches headers with weight, splitting the header and the weight in $outputArray if (preg_match('/(.*);\s*q=(1(?:\.0+)?|0\.\d+)$/', $header, $outputArray) === 1) { $headerData = [ 'header' => $outputArray[1], 'weight' => (int)($outputArray[2] * 1000), ]; } else { $headerData = [ 'header' => trim($header), 'weight' => 1000, ]; } return $headerData; } /** * @param array[] $headers * @param float $currentWeight * @param bool $hasMoreThan28Headers * @return string[] array of adjusted "Accept" headers */ private function adjustWeight(array $headers, float &$currentWeight, bool $hasMoreThan28Headers): array { usort($headers, function (array $a, array $b) { return $b['weight'] - $a['weight']; }); $acceptHeaders = []; foreach ($headers as $index => $header) { if($index > 0 && $headers[$index - 1]['weight'] > $header['weight']) { $currentWeight = $this->getNextWeight($currentWeight, $hasMoreThan28Headers); } $weight = $currentWeight; $acceptHeaders[] = $this->buildAcceptHeader($header['header'], $weight); } $currentWeight = $this->getNextWeight($currentWeight, $hasMoreThan28Headers); return $acceptHeaders; } /** * @param string $header * @param int $weight * @return string */ private function buildAcceptHeader(string $header, int $weight): string { if($weight === 1000) { return $header; } return trim($header, '; ') . ';q=' . rtrim(sprintf('%0.3f', $weight / 1000), '0'); } /** * Calculate the next weight, based on the current one. * * If there are less than 28 "Accept" headers, the weights will be decreased by 1 on its highest significant digit, using the * following formula: * * next weight = current weight - 10 ^ (floor(log(current weight - 1))) * * ( current weight minus ( 10 raised to the power of ( floor of (log to the base 10 of ( current weight minus 1 ) ) ) ) ) * * Starting from 1000, this generates the following series: * * 1000, 900, 800, 700, 600, 500, 400, 300, 200, 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 * * The resulting quality codes are closer to the average "normal" usage of them (like "q=0.9", "q=0.8" and so on), but it only works * if there is a maximum of 28 "Accept" headers. If we have more than that (which is extremely unlikely), then we fall back to a 1-by-1 * decrement rule, which will result in quality codes like "q=0.999", "q=0.998" etc. * * @param int $currentWeight varying from 1 to 1000 (will be divided by 1000 to build the quality value) * @param bool $hasMoreThan28Headers * @return int */ public function getNextWeight(int $currentWeight, bool $hasMoreThan28Headers): int { if ($currentWeight <= 1) { return 1; } if ($hasMoreThan28Headers) { return $currentWeight - 1; } return $currentWeight - 10 ** floor( log10($currentWeight - 1) ); } }