<?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
{
protected const UPPER = '_ABCDEFGHIJKLMNOPQRSTUVWXYZ';
protected const LOWER = '-abcdefghijklmnopqrstuvwxyz';
/**
* @var array<string, list<string|null>>
*/
protected $headers = [];
protected $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 array<string, array<int, string|null>>|array<int, 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 = [])
{
$this->headers = [];
$this->add($headers);
}
/**
* Adds new headers the current HTTP headers set.
*/
public function add(array $headers)
{
foreach ($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 (string) $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)
{
$key = strtr($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));
}
/**
* Removes a header.
*/
public function remove(string $key)
{
$key = strtr($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, \DateTime $default = null): ?\DateTimeInterface
{
if (null === $value = $this->get($key)) {
return $default;
}
if (false === $date = \DateTime::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)
{
$this->cacheControl[$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 $key)
{
unset($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($this->headers);
}
protected function getCacheControlHeader()
{
ksort($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);
}
}
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1. Information We Collect
2. How We Use Your Information
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We take the security of your personal information seriously and implement a variety of security measures, including encryption, secure servers, and access controls, to protect your data from unauthorized access, disclosure, alteration, or destruction. However, no method of transmission over the internet or electronic storage is completely secure, and we cannot guarantee its absolute security.
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