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- 28.08.2024
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AcceptHeader.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation;
013
014 /**
015 * Represents an Accept-* header.
016 *
017 * An accept header is compound with a list of items,
018 * sorted by descending quality.
019 *
020 * @author Jean-François Simon <contact@jfsimon.fr>
021 */
022 class AcceptHeader
023 {
024 /**
025 * @var AcceptHeaderItem[]
026 */
027 private $items = [];
028
029 /**
030 * @var bool
031 */
032 private $sorted = true;
033
034 /**
035 * @param AcceptHeaderItem[] $items
036 */
037 public function __construct(array $items)
038 {
039 foreach ($items as $item) {
040 $this->add($item);
041 }
042 }
043
044 /**
045 * Builds an AcceptHeader instance from a string.
046 *
047 * @param string $headerValue
048 *
049 * @return self
050 */
051 public static function fromString($headerValue)
052 {
053 $index = 0;
054
055 return new self(array_map(function ($itemValue) use (&$index) {
056 $item = AcceptHeaderItem::fromString($itemValue);
057 $item->setIndex($index++);
058
059 return $item;
060 }, preg_split('/\s*(?:,*("[^"]+"),*|,*(\'[^\']+\'),*|,+)\s*/', $headerValue, 0, \PREG_SPLIT_NO_EMPTY | \PREG_SPLIT_DELIM_CAPTURE)));
061 }
062
063 /**
064 * Returns header value's string representation.
065 *
066 * @return string
067 */
068 public function __toString()
069 {
070 return implode(',', $this->items);
071 }
072
073 /**
074 * Tests if header has given value.
075 *
076 * @param string $value
077 *
078 * @return bool
079 */
080 public function has($value)
081 {
082 return isset($this->items[$value]);
083 }
084
085 /**
086 * Returns given value's item, if exists.
087 *
088 * @param string $value
089 *
090 * @return AcceptHeaderItem|null
091 */
092 public function get($value)
093 {
094 return isset($this->items[$value]) ? $this->items[$value] : null;
095 }
096
097 /**
098 * Adds an item.
099 *
100 * @return $this
101 */
102 public function add(AcceptHeaderItem $item)
103 {
104 $this->items[$item->getValue()] = $item;
105 $this->sorted = false;
106
107 return $this;
108 }
109
110 /**
111 * Returns all items.
112 *
113 * @return AcceptHeaderItem[]
114 */
115 public function all()
116 {
117 $this->sort();
118
119 return $this->items;
120 }
121
122 /**
123 * Filters items on their value using given regex.
124 *
125 * @param string $pattern
126 *
127 * @return self
128 */
129 public function filter($pattern)
130 {
131 return new self(array_filter($this->items, function (AcceptHeaderItem $item) use ($pattern) {
132 return preg_match($pattern, $item->getValue());
133 }));
134 }
135
136 /**
137 * Returns first item.
138 *
139 * @return AcceptHeaderItem|null
140 */
141 public function first()
142 {
143 $this->sort();
144
145 return !empty($this->items) ? reset($this->items) : null;
146 }
147
148 /**
149 * Sorts items by descending quality.
150 */
151 private function sort()
152 {
153 if (!$this->sorted) {
154 uasort($this->items, function (AcceptHeaderItem $a, AcceptHeaderItem $b) {
155 $qA = $a->getQuality();
156 $qB = $b->getQuality();
157
158 if ($qA === $qB) {
159 return $a->getIndex() > $b->getIndex() ? 1 : -1;
160 }
161
162 return $qA > $qB ? -1 : 1;
163 });
164
165 $this->sorted = true;
166 }
167 }
168 }
169