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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\Http\Header;
use Zend\Http\Request;
/**
* Allow Header
*
* @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.7
*/
class Allow implements HeaderInterface
{
/**
* List of request methods
* true states that method is allowed, false - disallowed
* By default GET and POST are allowed
*
* @var array
*/
protected $methods = array(
Request::METHOD_OPTIONS => false,
Request::METHOD_GET => true,
Request::METHOD_HEAD => false,
Request::METHOD_POST => true,
Request::METHOD_PUT => false,
Request::METHOD_DELETE => false,
Request::METHOD_TRACE => false,
Request::METHOD_CONNECT => false,
Request::METHOD_PATCH => false,
);
/**
* Create Allow header from header line
*
* @param string $headerLine
* @return Allow
* @throws Exception\InvalidArgumentException
*/
public static function fromString($headerLine)
{
list($name, $value) = GenericHeader::splitHeaderLine($headerLine);
// check to ensure proper header type for this factory
if (strtolower($name) !== 'allow') {
throw new Exception\InvalidArgumentException('Invalid header line for Allow string: "' . $name . '"');
}
$header = new static();
$header->disallowMethods(array_keys($header->getAllMethods()));
$header->allowMethods(explode(',', $value));
return $header;
}
/**
* Get header name
*
* @return string
*/
public function getFieldName()
{
return 'Allow';
}
/**
* Get comma-separated list of allowed methods
*
* @return string
*/
public function getFieldValue()
{
return implode(', ', array_keys($this->methods, true, true));
}
/**
* Get list of all defined methods
*
* @return array
*/
public function getAllMethods()
{
return $this->methods;
}
/**
* Get list of allowed methods
*
* @return array
*/
public function getAllowedMethods()
{
return array_keys($this->methods, true, true);
}
/**
* Allow methods or list of methods
*
* @param array|string $allowedMethods
* @return Allow
*/
public function allowMethods($allowedMethods)
{
foreach ((array) $allowedMethods as $method) {
$method = trim(strtoupper($method));
if (preg_match('/\s/', $method)) {
throw new Exception\InvalidArgumentException(sprintf(
'Unable to whitelist method; "%s" is not a valid method',
$method
));
}
$this->methods[$method] = true;
}
return $this;
}
/**
* Disallow methods or list of methods
*
* @param array|string $disallowedMethods
* @return Allow
*/
public function disallowMethods($disallowedMethods)
{
foreach ((array) $disallowedMethods as $method) {
$method = trim(strtoupper($method));
if (preg_match('/\s/', $method)) {
throw new Exception\InvalidArgumentException(sprintf(
'Unable to blacklist method; "%s" is not a valid method',
$method
));
}
$this->methods[$method] = false;
}
return $this;
}
/**
* Convenience alias for @see disallowMethods()
*
* @param array|string $disallowedMethods
* @return Allow
*/
public function denyMethods($disallowedMethods)
{
return $this->disallowMethods($disallowedMethods);
}
/**
* Check whether method is allowed
*
* @param string $method
* @return bool
*/
public function isAllowedMethod($method)
{
$method = trim(strtoupper($method));
// disallow unknown method
if (! isset($this->methods[$method])) {
$this->methods[$method] = false;
}
return $this->methods[$method];
}
/**
* Return header as string
*
* @return string
*/
public function toString()
{
return 'Allow: ' . $this->getFieldValue();
}
}