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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>
- */
- 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, $values);
- }
- }
- /**
- * Returns the headers as a string.
- *
- * @return string The headers
- */
- public function __toString()
- {
- if (!$this->headers) {
- return '';
- }
- $max = max(array_map('strlen', array_keys($this->headers))) + 1;
- $content = '';
- ksort($this->headers);
- foreach ($this->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->headers);
- }
- /**
- * 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));
- if (!array_key_exists($key, $this->headers)) {
- if (null === $default) {
- return $first ? null : array();
- }
- return $first ? $default : array($default);
- }
- if ($first) {
- return count($this->headers[$key]) ? $this->headers[$key][0] : $default;
- }
- return $this->headers[$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->headers);
- }
- /**
- * 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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