审查视图

vendor/symfony/http-foundation/AcceptHeader.php 3.6 KB
郭盛 authored
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpFoundation;

/**
 * Represents an Accept-* header.
 *
 * An accept header is compound with a list of items,
 * sorted by descending quality.
 *
 * @author Jean-François Simon <contact@jfsimon.fr>
 */
class AcceptHeader
{
    /**
     * @var AcceptHeaderItem[]
     */
    private $items = [];

    /**
     * @var bool
     */
    private $sorted = true;

    /**
     * @param AcceptHeaderItem[] $items
     */
    public function __construct(array $items)
    {
        foreach ($items as $item) {
            $this->add($item);
        }
    }

    /**
     * Builds an AcceptHeader instance from a string.
     *
     * @param string $headerValue
     *
     * @return self
     */
    public static function fromString($headerValue)
    {
        $index = 0;
55 56 57 58 59 60 61
        $parts = HeaderUtils::split((string) $headerValue, ',;=');

        return new self(array_map(function ($subParts) use (&$index) {
            $part = array_shift($subParts);
            $attributes = HeaderUtils::combine($subParts);

            $item = new AcceptHeaderItem($part[0], $attributes);
郭盛 authored
62 63 64
            $item->setIndex($index++);

            return $item;
65
        }, $parts));
郭盛 authored
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
    }

    /**
     * Returns header value's string representation.
     *
     * @return string
     */
    public function __toString()
    {
        return implode(',', $this->items);
    }

    /**
     * Tests if header has given value.
     *
     * @param string $value
     *
     * @return bool
     */
    public function has($value)
    {
        return isset($this->items[$value]);
    }

    /**
     * Returns given value's item, if exists.
     *
     * @param string $value
     *
     * @return AcceptHeaderItem|null
     */
    public function get($value)
    {
99
        return $this->items[$value] ?? $this->items[explode('/', $value)[0].'/*'] ?? $this->items['*/*'] ?? $this->items['*'] ?? null;
郭盛 authored
100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173
    }

    /**
     * Adds an item.
     *
     * @return $this
     */
    public function add(AcceptHeaderItem $item)
    {
        $this->items[$item->getValue()] = $item;
        $this->sorted = false;

        return $this;
    }

    /**
     * Returns all items.
     *
     * @return AcceptHeaderItem[]
     */
    public function all()
    {
        $this->sort();

        return $this->items;
    }

    /**
     * Filters items on their value using given regex.
     *
     * @param string $pattern
     *
     * @return self
     */
    public function filter($pattern)
    {
        return new self(array_filter($this->items, function (AcceptHeaderItem $item) use ($pattern) {
            return preg_match($pattern, $item->getValue());
        }));
    }

    /**
     * Returns first item.
     *
     * @return AcceptHeaderItem|null
     */
    public function first()
    {
        $this->sort();

        return !empty($this->items) ? reset($this->items) : null;
    }

    /**
     * Sorts items by descending quality.
     */
    private function sort()
    {
        if (!$this->sorted) {
            uasort($this->items, function (AcceptHeaderItem $a, AcceptHeaderItem $b) {
                $qA = $a->getQuality();
                $qB = $b->getQuality();

                if ($qA === $qB) {
                    return $a->getIndex() > $b->getIndex() ? 1 : -1;
                }

                return $qA > $qB ? -1 : 1;
            });

            $this->sorted = true;
        }
    }
}