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<?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;
// Help opcache.preload discover always-needed symbols
class_exists(AcceptHeaderItem::class);
/**
* 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 array<string, AcceptHeaderItem>
*/
private array $items = [];
private bool $sorted = true;
/**
* @param AcceptHeaderItem[] $items
*/
public function __construct(array $items)
{
foreach ($items as $item) {
$this->add($item);
}
}
/**
* Builds an AcceptHeader instance from a string.
*/
public static function fromString(?string $headerValue): self
{
$items = [];
foreach (HeaderUtils::split($headerValue ?? '', ',;=') as $i => $parts) {
$part = array_shift($parts);
$item = new AcceptHeaderItem($part[0], HeaderUtils::combine($parts));
$items[] = $item->setIndex($i);
}
return new self($items);
}
/**
* Returns header value's string representation.
*/
public function __toString(): string
{
return implode(',', $this->items);
}
/**
* Tests if header has given value.
*/
public function has(string $value): bool
{
$canonicalKey = $this->getCanonicalKey(AcceptHeaderItem::fromString($value));
return isset($this->items[$canonicalKey]);
}
/**
* Returns given value's item, if exists.
*/
public function get(string $value): ?AcceptHeaderItem
{
$queryItem = AcceptHeaderItem::fromString($value.';q=1');
$canonicalKey = $this->getCanonicalKey($queryItem);
if (isset($this->items[$canonicalKey])) {
return $this->items[$canonicalKey];
}
// Collect and filter matching candidates
if (!$candidates = array_filter($this->items, fn (AcceptHeaderItem $item) => $this->matches($item, $queryItem))) {
return null;
}
usort(
$candidates,
fn ($a, $b) => $this->getSpecificity($b, $queryItem) <=> $this->getSpecificity($a, $queryItem) // Descending specificity
?: $b->getQuality() <=> $a->getQuality() // Descending quality
?: $a->getIndex() <=> $b->getIndex() // Ascending index (stability)
);
return reset($candidates);
}
/**
* Adds an item.
*
* @return $this
*/
public function add(AcceptHeaderItem $item): static
{
$this->items[$this->getCanonicalKey($item)] = $item;
$this->sorted = false;
return $this;
}
/**
* Returns all items.
*
* @return AcceptHeaderItem[]
*/
public function all(): array
{
$this->sort();
return $this->items;
}
/**
* Filters items on their value using given regex.
*/
public function filter(string $pattern): self
{
return new self(array_filter($this->items, static fn ($item) => preg_match($pattern, $item->getValue())));
}
/**
* Returns first item.
*/
public function first(): ?AcceptHeaderItem
{
$this->sort();
return $this->items ? reset($this->items) : null;
}
/**
* Sorts items by descending quality.
*/
private function sort(): void
{
if (!$this->sorted) {
uasort($this->items, static fn ($a, $b) => $b->getQuality() <=> $a->getQuality() ?: $a->getIndex() <=> $b->getIndex());
$this->sorted = true;
}
}
/**
* Generates the canonical key for storing/retrieving an item.
*/
private function getCanonicalKey(AcceptHeaderItem $item): string
{
$parts = [];
// Normalize and sort attributes for consistent key generation
$attributes = $this->getMediaParams($item);
ksort($attributes);
foreach ($attributes as $name => $value) {
if (null === $value) {
$parts[] = $name; // Flag parameter (e.g., "flowed")
continue;
}
// Quote values containing spaces, commas, semicolons, or equals per RFC 9110
// This handles cases like 'format="value with space"' or similar.
$quotedValue = \is_string($value) && preg_match('/[\s;,=]/', $value) ? '"'.addcslashes($value, '"\\').'"' : $value;
$parts[] = $name.'='.$quotedValue;
}
return $item->getValue().($parts ? ';'.implode(';', $parts) : '');
}
/**
* Checks if a given header item (range) matches a queried item (value).
*
* @param AcceptHeaderItem $rangeItem The item from the Accept header (e.g., text/*;format=flowed)
* @param AcceptHeaderItem $queryItem The item being queried (e.g., text/plain;format=flowed;charset=utf-8)
*/
private function matches(AcceptHeaderItem $rangeItem, AcceptHeaderItem $queryItem): bool
{
$rangeValue = strtolower($rangeItem->getValue());
$queryValue = strtolower($queryItem->getValue());
// Handle universal wildcard ranges
if ('*' === $rangeValue || '*/*' === $rangeValue) {
return $this->rangeParametersMatch($rangeItem, $queryItem);
}
// Queries for '*' only match wildcard ranges (handled above)
if ('*' === $queryValue) {
return false;
}
// Ensure media vs. non-media consistency
$isQueryMedia = str_contains($queryValue, '/');
$isRangeMedia = str_contains($rangeValue, '/');
if ($isQueryMedia !== $isRangeMedia) {
return false;
}
// Non-media: exact match only (wildcards handled above)
if (!$isQueryMedia) {
return $rangeValue === $queryValue && $this->rangeParametersMatch($rangeItem, $queryItem);
}
// Media type: type/subtype with wildcards
[$queryType, $querySubtype] = explode('/', $queryValue, 2);
[$rangeType, $rangeSubtype] = explode('/', $rangeValue, 2) + [1 => '*'];
if ('*' !== $rangeType && $rangeType !== $queryType) {
return false;
}
if ('*' !== $rangeSubtype && $rangeSubtype !== $querySubtype) {
return false;
}
// Parameters must match
return $this->rangeParametersMatch($rangeItem, $queryItem);
}
/**
* Checks if the parameters of a range item are satisfied by the query item.
*
* Parameters are case-insensitive; range params must be a subset of query params.
*/
private function rangeParametersMatch(AcceptHeaderItem $rangeItem, AcceptHeaderItem $queryItem): bool
{
$queryAttributes = $this->getMediaParams($queryItem);
$rangeAttributes = $this->getMediaParams($rangeItem);
foreach ($rangeAttributes as $name => $rangeValue) {
if (!\array_key_exists($name, $queryAttributes)) {
return false; // Missing required param
}
$queryValue = $queryAttributes[$name];
if (null === $rangeValue) {
return null === $queryValue; // Both flags or neither
}
if (null === $queryValue || strtolower($queryValue) !== strtolower($rangeValue)) {
return false;
}
}
return true;
}
/**
* Calculates a specificity score for sorting: media precision + param count.
*/
private function getSpecificity(AcceptHeaderItem $item, AcceptHeaderItem $queryItem): int
{
$rangeValue = strtolower($item->getValue());
$queryValue = strtolower($queryItem->getValue());
$paramCount = \count($this->getMediaParams($item));
$isQueryMedia = str_contains($queryValue, '/');
$isRangeMedia = str_contains($rangeValue, '/');
if (!$isQueryMedia && !$isRangeMedia) {
return ('*' !== $rangeValue ? 2000 : 1000) + $paramCount;
}
[$rangeType, $rangeSubtype] = explode('/', $rangeValue, 2) + [1 => '*'];
$specificity = match (true) {
'*' !== $rangeSubtype => 3000, // Exact subtype (text/plain)
'*' !== $rangeType => 2000, // Type wildcard (text/*)
default => 1000, // Full wildcard (*/* or *)
};
return $specificity + $paramCount;
}
/**
* Returns normalized attributes: keys lowercased, excluding 'q'.
*/
private function getMediaParams(AcceptHeaderItem $item): array
{
$attributes = array_change_key_case($item->getAttributes(), \CASE_LOWER);
unset($attributes['q']);
return $attributes;
}
}