117 lines
3.5 KiB
PHP
117 lines
3.5 KiB
PHP
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<?php
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/**
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* Note : Code is released under the GNU LGPL
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*
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* Please do not change the header of this file
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*
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* This library is free software; you can redistribute it and/or modify it under the terms of the GNU
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* Lesser General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* See the GNU Lesser General Public License for more details.
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*/
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/**
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* The AcceptHeader page will parse and sort the different
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* allowed types for the content negociations
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*
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* @author Pierrick Charron <pierrick@webstart.fr>
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*/
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class AcceptHeader extends \ArrayObject
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{
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/**
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* Constructor
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*
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* @param string $header Value of the Accept header
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* @return void
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*/
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public function __construct($header)
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{
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$acceptedTypes = $this->_parse($header);
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usort($acceptedTypes, [$this, '_compare']);
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parent::__construct($acceptedTypes);
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}
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/**
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* Parse the accept header and return an array containing
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* all the informations about the Accepted types
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*
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* @param string $data Value of the Accept header
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* @return array
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*/
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private function _parse($data)
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{
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$array = [];
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$items = explode(',', $data);
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foreach ($items as $item) {
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$elems = explode(';', $item);
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$acceptElement = [];
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$mime = current($elems);
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list($type, $subtype) = explode('/', $mime);
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$acceptElement['type'] = trim($type);
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$acceptElement['subtype'] = trim($subtype);
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$acceptElement['raw'] = $mime;
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$acceptElement['params'] = [];
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while (next($elems)) {
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list($name, $value) = explode('=', current($elems));
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$acceptElement['params'][trim($name)] = trim($value);
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}
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$array[] = $acceptElement;
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}
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return $array;
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}
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/**
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* Compare two Accepted types with their parameters to know
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* if one media type should be used instead of an other
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*
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* @param array $a The first media type and its parameters
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* @param array $b The second media type and its parameters
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* @return int
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*/
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private function _compare($a, $b)
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{
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$a_q = isset($a['params']['q']) ? floatval($a['params']['q']) : 1.0;
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$b_q = isset($b['params']['q']) ? floatval($b['params']['q']) : 1.0;
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if ($a_q === $b_q) {
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$a_count = count($a['params']);
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$b_count = count($b['params']);
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if ($a_count === $b_count) {
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if ($r = $this->_compareSubType($a['subtype'], $b['subtype'])) {
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return $r;
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} else {
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return $this->_compareSubType($a['type'], $b['type']);
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}
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} else {
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return $a_count < $b_count;
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}
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} else {
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return $a_q < $b_q;
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}
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}
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/**
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* Compare two subtypes
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*
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* @param string $a First subtype to compare
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* @param string $b Second subtype to compare
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* @return int
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*/
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private function _compareSubType($a, $b)
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{
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if ($a === '*' && $b !== '*') {
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return 1;
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} elseif ($b === '*' && $a !== '*') {
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return -1;
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} else {
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return 0;
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}
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}
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}
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