325 lines
8.5 KiB
PHP
325 lines
8.5 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpFoundation;
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/**
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* HeaderBag is a container for HTTP headers.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class HeaderBag implements \IteratorAggregate, \Countable
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{
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protected $headers = array();
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protected $cacheControl = array();
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/**
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* Constructor.
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*
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* @param array $headers An array of HTTP headers
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*/
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public function __construct(array $headers = array())
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{
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foreach ($headers as $key => $values) {
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$this->set($key, $values);
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}
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}
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/**
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* Returns the headers as a string.
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*
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* @return string The headers
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*/
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public function __toString()
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{
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if (!$this->headers) {
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return '';
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}
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$max = max(array_map('strlen', array_keys($this->headers))) + 1;
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$content = '';
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ksort($this->headers);
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foreach ($this->headers as $name => $values) {
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$name = implode('-', array_map('ucfirst', explode('-', $name)));
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foreach ($values as $value) {
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$content .= sprintf("%-{$max}s %s\r\n", $name.':', $value);
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}
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}
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return $content;
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}
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/**
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* Returns the headers.
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*
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* @return array An array of headers
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*/
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public function all()
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{
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return $this->headers;
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}
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/**
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* Returns the parameter keys.
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*
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* @return array An array of parameter keys
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*/
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public function keys()
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{
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return array_keys($this->headers);
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}
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/**
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* Replaces the current HTTP headers by a new set.
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*
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* @param array $headers An array of HTTP headers
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*/
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public function replace(array $headers = array())
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{
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$this->headers = array();
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$this->add($headers);
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}
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/**
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* Adds new headers the current HTTP headers set.
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*
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* @param array $headers An array of HTTP headers
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*/
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public function add(array $headers)
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{
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foreach ($headers as $key => $values) {
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$this->set($key, $values);
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}
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}
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/**
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* Returns a header value by name.
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*
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* @param string $key The header name
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* @param mixed $default The default value
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* @param bool $first Whether to return the first value or all header values
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*
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* @return string|array The first header value if $first is true, an array of values otherwise
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*/
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public function get($key, $default = null, $first = true)
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{
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$key = str_replace('_', '-', strtolower($key));
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if (!array_key_exists($key, $this->headers)) {
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if (null === $default) {
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return $first ? null : array();
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}
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return $first ? $default : array($default);
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}
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if ($first) {
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return count($this->headers[$key]) ? $this->headers[$key][0] : $default;
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}
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return $this->headers[$key];
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}
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/**
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* Sets a header by name.
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*
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* @param string $key The key
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* @param string|array $values The value or an array of values
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* @param bool $replace Whether to replace the actual value or not (true by default)
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*/
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public function set($key, $values, $replace = true)
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{
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$key = str_replace('_', '-', strtolower($key));
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$values = array_values((array) $values);
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if (true === $replace || !isset($this->headers[$key])) {
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$this->headers[$key] = $values;
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} else {
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$this->headers[$key] = array_merge($this->headers[$key], $values);
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}
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if ('cache-control' === $key) {
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$this->cacheControl = $this->parseCacheControl($values[0]);
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}
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}
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/**
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* Returns true if the HTTP header is defined.
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*
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* @param string $key The HTTP header
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*
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* @return bool true if the parameter exists, false otherwise
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*/
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public function has($key)
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{
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return array_key_exists(str_replace('_', '-', strtolower($key)), $this->headers);
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}
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/**
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* Returns true if the given HTTP header contains the given value.
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*
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* @param string $key The HTTP header name
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* @param string $value The HTTP value
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*
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* @return bool true if the value is contained in the header, false otherwise
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*/
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public function contains($key, $value)
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{
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return in_array($value, $this->get($key, null, false));
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}
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/**
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* Removes a header.
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*
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* @param string $key The HTTP header name
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*/
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public function remove($key)
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{
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$key = str_replace('_', '-', strtolower($key));
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unset($this->headers[$key]);
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if ('cache-control' === $key) {
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$this->cacheControl = array();
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}
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}
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/**
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* Returns the HTTP header value converted to a date.
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*
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* @param string $key The parameter key
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* @param \DateTime $default The default value
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*
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* @return null|\DateTime The parsed DateTime or the default value if the header does not exist
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*
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* @throws \RuntimeException When the HTTP header is not parseable
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*/
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public function getDate($key, \DateTime $default = null)
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{
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if (null === $value = $this->get($key)) {
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return $default;
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}
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if (false === $date = \DateTime::createFromFormat(DATE_RFC2822, $value)) {
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throw new \RuntimeException(sprintf('The %s HTTP header is not parseable (%s).', $key, $value));
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}
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return $date;
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}
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/**
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* Adds a custom Cache-Control directive.
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*
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* @param string $key The Cache-Control directive name
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* @param mixed $value The Cache-Control directive value
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*/
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public function addCacheControlDirective($key, $value = true)
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{
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$this->cacheControl[$key] = $value;
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$this->set('Cache-Control', $this->getCacheControlHeader());
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}
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/**
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* Returns true if the Cache-Control directive is defined.
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*
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* @param string $key The Cache-Control directive
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*
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* @return bool true if the directive exists, false otherwise
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*/
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public function hasCacheControlDirective($key)
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{
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return array_key_exists($key, $this->cacheControl);
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}
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/**
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* Returns a Cache-Control directive value by name.
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*
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* @param string $key The directive name
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*
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* @return mixed|null The directive value if defined, null otherwise
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*/
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public function getCacheControlDirective($key)
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{
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return array_key_exists($key, $this->cacheControl) ? $this->cacheControl[$key] : null;
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}
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/**
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* Removes a Cache-Control directive.
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*
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* @param string $key The Cache-Control directive
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*/
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public function removeCacheControlDirective($key)
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{
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unset($this->cacheControl[$key]);
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$this->set('Cache-Control', $this->getCacheControlHeader());
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}
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/**
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* Returns an iterator for headers.
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*
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* @return \ArrayIterator An \ArrayIterator instance
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*/
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public function getIterator()
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{
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return new \ArrayIterator($this->headers);
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}
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/**
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* Returns the number of headers.
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*
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* @return int The number of headers
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*/
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public function count()
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{
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return count($this->headers);
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}
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protected function getCacheControlHeader()
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{
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$parts = array();
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ksort($this->cacheControl);
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foreach ($this->cacheControl as $key => $value) {
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if (true === $value) {
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$parts[] = $key;
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} else {
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if (preg_match('#[^a-zA-Z0-9._-]#', $value)) {
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$value = '"'.$value.'"';
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}
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$parts[] = "$key=$value";
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}
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}
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return implode(', ', $parts);
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}
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/**
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* Parses a Cache-Control HTTP header.
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*
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* @param string $header The value of the Cache-Control HTTP header
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*
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* @return array An array representing the attribute values
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*/
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protected function parseCacheControl($header)
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{
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$cacheControl = array();
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preg_match_all('#([a-zA-Z][a-zA-Z_-]*)\s*(?:=(?:"([^"]*)"|([^ \t",;]*)))?#', $header, $matches, PREG_SET_ORDER);
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foreach ($matches as $match) {
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$cacheControl[strtolower($match[1])] = isset($match[3]) ? $match[3] : (isset($match[2]) ? $match[2] : true);
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}
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return $cacheControl;
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}
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}
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