<?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>
*/
class HeaderBag implements \IteratorAggregate, \Countable
{
protected $headers = array();
protected $cacheControl = array();
/**
* Constructor.
*
* @param array $headers An array of HTTP headers
*/
public function __construct(array $headers = array())
{
foreach ($headers as $key => $values) {
$this->set($key, $values);
}
}
/**
* Returns the headers as a string.
*
* @return string The headers
*/
public function __toString()
{
if (!$headers = $this->all()) {
return '';
}
ksort($headers);
$max = max(array_map('strlen', array_keys($headers))) + 1;
$content = '';
foreach ($headers as $name => $values) {
$name = implode('-', array_map('ucfirst', explode('-', $name)));
foreach ($values as $value) {
$content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);
}
}
return $content;
}
/**
* Returns the headers.
*
* @return array An array of headers
*/
public function all()
{
return $this->headers;
}
/**
* Returns the parameter keys.
*
* @return array An array of parameter keys
*/
public function keys()
{
return array_keys($this->all());
}
/**
* Replaces the current HTTP headers by a new set.
*
* @param array $headers An array of HTTP headers
*/
public function replace(array $headers = array())
{
$this->headers = array();
$this->add($headers);
}
/**
* Adds new headers the current HTTP headers set.
*
* @param array $headers An array of HTTP headers
*/
public function add(array $headers)
{
foreach ($headers as $key => $values) {
$this->set($key, $values);
}
}
/**
* Returns a header value by name.
*
* @param string $key The header name
* @param mixed $default The default value
* @param bool $first Whether to return the first value or all header values
*
* @return string|array The first header value if $first is true, an array of values otherwise
*/
public function get($key, $default = null, $first = true)
{
$key = str_replace('_', '-', strtolower($key));
$headers = $this->all();
if (!array_key_exists($key, $headers)) {
if (null === $default) {
return $first ? null : array();
}
return $first ? $default : array($default);
}
if ($first) {
return count($headers[$key]) ? $headers[$key][0] : $default;
}
return $headers[$key];
}
/**
* Sets a header by name.
*
* @param string $key The key
* @param string|array $values The value or an array of values
* @param bool $replace Whether to replace the actual value or not (true by default)
*/
public function set($key, $values, $replace = true)
{
$key = str_replace('_', '-', strtolower($key));
$values = array_values((array) $values);
if (true === $replace || !isset($this->headers[$key])) {
$this->headers[$key] = $values;
} else {
$this->headers[$key] = array_merge($this->headers[$key], $values);
}
if ('cache-control' === $key) {
$this->cacheControl = $this->parseCacheControl($values[0]);
}
}
/**
* Returns true if the HTTP header is defined.
*
* @param string $key The HTTP header
*
* @return bool true if the parameter exists, false otherwise
*/
public function has($key)
{
return array_key_exists(str_replace('_', '-', strtolower($key)), $this->all());
}
/**
* Returns true if the given HTTP header contains the given value.
*
* @param string $key The HTTP header name
* @param string $value The HTTP value
*
* @return bool true if the value is contained in the header, false otherwise
*/
public function contains($key, $value)
{
return in_array($value, $this->get($key, null, false));
}
/**
* Removes a header.
*
* @param string $key The HTTP header name
*/
public function remove($key)
{
$key = str_replace('_', '-', strtolower($key));
unset($this->headers[$key]);
if ('cache-control' === $key) {
$this->cacheControl = array();
}
}
/**
* Returns the HTTP header value converted to a date.
*
* @param string $key The parameter key
* @param \DateTime $default The default value
*
* @return null|\DateTime The parsed DateTime or the default value if the header does not exist
*
* @throws \RuntimeException When the HTTP header is not parseable
*/
public function getDate($key, \DateTime $default = null)
{
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.
*
* @param string $key The Cache-Control directive name
* @param mixed $value The Cache-Control directive value
*/
public function addCacheControlDirective($key, $value = true)
{
$this->cacheControl[$key] = $value;
$this->set('Cache-Control', $this->getCacheControlHeader());
}
/**
* Returns true if the Cache-Control directive is defined.
*
* @param string $key The Cache-Control directive
*
* @return bool true if the directive exists, false otherwise
*/
public function hasCacheControlDirective($key)
{
return array_key_exists($key, $this->cacheControl);
}
/**
* Returns a Cache-Control directive value by name.
*
* @param string $key The directive name
*
* @return mixed|null The directive value if defined, null otherwise
*/
public function getCacheControlDirective($key)
{
return array_key_exists($key, $this->cacheControl) ? $this->cacheControl[$key] : null;
}
/**
* Removes a Cache-Control directive.
*
* @param string $key The Cache-Control directive
*/
public function removeCacheControlDirective($key)
{
unset($this->cacheControl[$key]);
$this->set('Cache-Control', $this->getCacheControlHeader());
}
/**
* Returns an iterator for headers.
*
* @return \ArrayIterator An \ArrayIterator instance
*/
public function getIterator()
{
return new \ArrayIterator($this->headers);
}
/**
* Returns the number of headers.
*
* @return int The number of headers
*/
public function count()
{
return count($this->headers);
}
protected function getCacheControlHeader()
{
$parts = array();
ksort($this->cacheControl);
foreach ($this->cacheControl as $key => $value) {
if (true === $value) {
$parts[] = $key;
} else {
if (preg_match('#[^a-zA-Z0-9._-]#', $value)) {
$value = '"'.$value.'"';
}
$parts[] = "$key=$value";
}
}
return implode(', ', $parts);
}
/**
* Parses a Cache-Control HTTP header.
*
* @param string $header The value of the Cache-Control HTTP header
*
* @return array An array representing the attribute values
*/
protected function parseCacheControl($header)
{
$cacheControl = array();
preg_match_all('#([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?#', $header, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$cacheControl[strtolower($match[1])] = isset($match[3]) ? $match[3] : (isset($match[2]) ? $match[2] : true);
}
return $cacheControl;
}
}
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