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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;
/**
* HeaderBag is a container for HTTP headers.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @implements \IteratorAggregate<string, list<string|null>>
*/
class HeaderBag implements \IteratorAggregate, \Countable, \Stringable
{
protected const UPPER = '_ABCDEFGHIJKLMNOPQRSTUVWXYZ';
protected const LOWER = '-abcdefghijklmnopqrstuvwxyz';
/**
* @var array<string, list<string|null>>
*/
protected array $headers = [];
protected array $cacheControl = [];
public function __construct(array $headers = [])
{
foreach ($headers as $key => $values) {
$this->set($key, $values);
}
}
/**
* Returns the headers as a string.
*/
public function __toString(): string
{
if (!$headers = $this->all()) {
return '';
}
ksort($headers);
$max = max(array_map('strlen', array_keys($headers))) + 1;
$content = '';
foreach ($headers as $name => $values) {
$name = ucwords($name, '-');
foreach ($values as $value) {
$content .= \sprintf("%-{$max}s %s\r\n", $name.':', $value);
}
}
return $content;
}
/**
* Returns the headers.
*
* @param string|null $key The name of the headers to return or null to get them all
*
* @return ($key is null ? array<string, list<string|null>> : list<string|null>)
*/
public function all(?string $key = null): array
{
if (null !== $key) {
return $this->headers[strtr($key, self::UPPER, self::LOWER)] ?? [];
}
return $this->headers;
}
/**
* Returns the parameter keys.
*
* @return string[]
*/
public function keys(): array
{
return array_keys($this->all());
}
/**
* Replaces the current HTTP headers by a new set.
*/
public function replace(array $headers = []): void
{
$this->headers = [];
$this->add($headers);
}
/**
* Adds new headers the current HTTP headers set.
*/
public function add(array $headers): void
{
foreach ($headers as $key => $values) {
$this->set($key, $values);
}
}
/**
* Returns the first header by name or the default one.
*/
public function get(string $key, ?string $default = null): ?string
{
$headers = $this->all($key);
if (!$headers) {
return $default;
}
if (null === $headers[0]) {
return null;
}
return $headers[0];
}
/**
* Sets a header by name.
*
* @param string|string[]|null $values The value or an array of values
* @param bool $replace Whether to replace the actual value or not (true by default)
*/
public function set(string $key, string|array|null $values, bool $replace = true): void
{
$key = strtr($key, self::UPPER, self::LOWER);
if (\is_array($values)) {
$values = array_values($values);
if (true === $replace || !isset($this->headers[$key])) {
$this->headers[$key] = $values;
} else {
$this->headers[$key] = array_merge($this->headers[$key], $values);
}
} else {
if (true === $replace || !isset($this->headers[$key])) {
$this->headers[$key] = [$values];
} else {
$this->headers[$key][] = $values;
}
}
if ('cache-control' === $key) {
$this->cacheControl = $this->parseCacheControl(implode(', ', $this->headers[$key]));
}
}
/**
* Returns true if the HTTP header is defined.
*/
public function has(string $key): bool
{
return \array_key_exists(strtr($key, self::UPPER, self::LOWER), $this->all());
}
/**
* Returns true if the given HTTP header contains the given value.
*/
public function contains(string $key, string $value): bool
{
return \in_array($value, $this->all($key), true);
}
/**
* Removes a header.
*/
public function remove(string $key): void
{
$key = strtr($key, self::UPPER, self::LOWER);
unset($this->headers[$key]);
if ('cache-control' === $key) {
$this->cacheControl = [];
}
}
/**
* Returns the HTTP header value converted to a date.
*
* @throws \RuntimeException When the HTTP header is not parseable
*/
public function getDate(string $key, ?\DateTimeInterface $default = null): ?\DateTimeImmutable
{
if (null === $value = $this->get($key)) {
return null !== $default ? \DateTimeImmutable::createFromInterface($default) : null;
}
if (false === $date = \DateTimeImmutable::createFromFormat(\DATE_RFC2822, $value)) {
throw new \RuntimeException(\sprintf('The "%s" HTTP header is not parseable (%s).', $key, $value));
}
return $date;
}
/**
* Adds a custom Cache-Control directive.
*/
public function addCacheControlDirective(string $key, bool|string $value = true): void
{
$this->cacheControl[$key] = $value;
$this->set('Cache-Control', $this->getCacheControlHeader());
}
/**
* Returns true if the Cache-Control directive is defined.
*/
public function hasCacheControlDirective(string $key): bool
{
return \array_key_exists($key, $this->cacheControl);
}
/**
* Returns a Cache-Control directive value by name.
*/
public function getCacheControlDirective(string $key): bool|string|null
{
return $this->cacheControl[$key] ?? null;
}
/**
* Removes a Cache-Control directive.
*/
public function removeCacheControlDirective(string $key): void
{
unset($this->cacheControl[$key]);
$this->set('Cache-Control', $this->getCacheControlHeader());
}
/**
* Returns an iterator for headers.
*
* @return \ArrayIterator<string, list<string|null>>
*/
public function getIterator(): \ArrayIterator
{
return new \ArrayIterator($this->headers);
}
/**
* Returns the number of headers.
*/
public function count(): int
{
return \count($this->headers);
}
protected function getCacheControlHeader(): string
{
ksort($this->cacheControl);
return HeaderUtils::toString($this->cacheControl, ',');
}
/**
* Parses a Cache-Control HTTP header.
*/
protected function parseCacheControl(string $header): array
{
$parts = HeaderUtils::split($header, ',=');
return HeaderUtils::combine($parts);
}
}