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<?php |
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declare(strict_types=1); |
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/** |
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* Caridea |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not |
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* use this file except in compliance with the License. You may obtain a copy of |
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* the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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* License for the specific language governing permissions and limitations under |
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* the License. |
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* |
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* @copyright 2015-2018 LibreWorks contributors |
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* @license Apache-2.0 |
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*/ |
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namespace Caridea\Http; |
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/** |
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* Provides utilities for working with the HTTP Accept header. |
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* |
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* @copyright 2015-2018 LibreWorks contributors |
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* @license Apache-2.0 |
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*/ |
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class AcceptTypes |
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{ |
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/** |
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* @var \SplPriorityQueue |
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*/ |
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private $types; |
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/** |
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* Creates a new AcceptTypes. |
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* |
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* @param array $server The server variables. (e.g. `$_SERVER`) |
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*/ |
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public function __construct(array $server) |
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{ |
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$this->types = new \SplPriorityQueue(); |
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if (isset($server['HTTP_ACCEPT'])) { |
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foreach (preg_split('#,\s*#', $server['HTTP_ACCEPT']) as $accept) { |
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$split = array_pad(preg_split('#;\s*q=#', $accept, 2), 2, 1.0); |
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$this->types->insert($split[0], (float)$split[1]); |
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} |
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} |
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} |
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/** |
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* Returns the most preferred MIME type out of the provided list. |
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* |
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* This method will iterate through the stored MIME types in preferred order |
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* and attempt to match them to those provided. |
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* |
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* Say for example the HTTP Accept header was: |
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* `text/html,application/xhtml+xml,application/xml;q=0.9,text/*;q=0.8`. |
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* |
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* ```php |
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* // will return 'text/html' |
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* $types->preferred(['text/css', 'text/html', 'application/javascript']); |
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* // will return 'application/xml' |
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* $types->preferred(['application/xml', 'text/css', 'application/json']); |
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* // will return 'text/plain' |
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* $types->preferred(['text/plain', 'text/css', 'application/json']); |
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* // will return null |
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* $types->preferred(['application/json', 'application/octet-stream']); |
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* // will return null |
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* $types->preferred([]); |
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* ``` |
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* |
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* @param string[] $types The MIME types to compare |
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* @return string|null The most preferred MIME type or null |
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*/ |
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public function preferred(array $types): ?string |
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{ |
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if (empty($types)) { |
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return null; |
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} |
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foreach ($this->types as $type) { |
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if (in_array($type, $types, true)) { |
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return $type; |
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} elseif ('*/*' == $type) { |
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return current($types); |
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} elseif (strlen($type) > 2 && substr($type, -2, 2) == '/*') { |
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$prefix = substr($type, 0, strpos($type, '/') + 1); |
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$plen = strlen($prefix); |
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foreach ($types as $t) { |
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if (strncmp($prefix, $t, $plen) === 0) { |
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return $t; |
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} |
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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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libreworks /
caridea-http
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