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<?php |
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declare(strict_types=1); |
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namespace Chubbyphp\ApiHttp\Negotiation; |
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final class ContentNegotiator implements ContentNegotiatorInterface |
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{ |
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/** |
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* @param string $header |
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* @param array $supportedContentTypes |
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* |
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* @return Content|null |
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*/ |
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public function negotiate(string $header, array $supportedContentTypes) |
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{ |
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$aggregatedValues = $this->aggregatedValues($header); |
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return $this->compareAgainstSupportedTypes($aggregatedValues, $supportedContentTypes); |
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} |
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/** |
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* @param string $header |
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* |
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* @return array |
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*/ |
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private function aggregatedValues(string $header): array |
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{ |
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$values = []; |
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foreach (explode(',', $header) as $headerValue) { |
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$headerValueParts = explode(';', $headerValue); |
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$contentType = trim(array_shift($headerValueParts)); |
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$attributes = []; |
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foreach ($headerValueParts as $attribute) { |
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list($attributeKey, $attributeValue) = explode('=', $attribute); |
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$attributes[trim($attributeKey)] = trim($attributeValue); |
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} |
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if (!isset($attributes['q'])) { |
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$attributes['q'] = '1.0'; |
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} |
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$values[$contentType] = $attributes; |
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} |
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uasort($values, function (array $a, array $b) { |
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return $b['q'] <=> $a['q']; |
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}); |
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return $values; |
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} |
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/** |
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* @param array $aggregatedValues |
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* @param array $supportedContentTypes |
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* |
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* @return Content|null |
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*/ |
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private function compareAgainstSupportedTypes(array $aggregatedValues, array $supportedContentTypes) |
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{ |
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foreach ($aggregatedValues as $contentType => $attributes) { |
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list($type, $subType) = explode('/', $contentType); |
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$typePattern = '*' !== $type ? preg_quote($type) : '[^\/]+'; |
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$subTypePattern = '*' !== $subType ? preg_quote($subType) : '[^\/]+'; |
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foreach ($supportedContentTypes as $supportedContentType) { |
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if (1 === preg_match('/^'.$typePattern.'\/'.$subTypePattern.'$/', $supportedContentType)) { |
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return new Content($supportedContentType, $attributes); |
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} |
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} |
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} |
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return null; |
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} |
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} |
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chubbyphp /
chubbyphp-api-http
