1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 <?php
namespace Riimu\Kit\CSRF\Source;
/**
* Looks for the token sent in request headers.
* @author Riikka Kalliomäki <riikka.kalliomaki@gmail.com>
* @copyright Copyright (c) 2014, Riikka Kalliomäki
* @license http://opensource.org/licenses/mit-license.php MIT License
*/
class HeaderSource implements TokenSource
{
/** @var string Name of the custom header used to send the csrf token */
private $header;
/**
* Creates a new instance of HeaderSource.
* @param string $headerName Case insensitive name of the header
*/
public function __construct($headerName = 'X-CSRF-Token')
{
$this->header = $headerName;
}
public function getRequestToken()
{
$token = $this->getHeader($this->header, $this->getRequestHeaders());
if ($token === false) {
$header = 'HTTP_' . str_replace('-', '_', $this->header);
$token = $this->getHeader($header, $this->getServerHeaders());
}
return $token;
}
/**
* Returns headers provided in the request as is.
* @return array Associative array of request headers
*/
protected function getRequestHeaders()
{
$headers = function_exists('apache_request_headers')
? apache_request_headers() : [];
return is_array($headers) ? $headers : [];
}
/**
* Returns the server data array with header information.
* @return array Server data array
*/
protected function getServerHeaders()
{
return isset($_SERVER) ? $_SERVER : [];
}
/**
* Returns the case insensitive header from the list of headers.
* @param string $name name of the header
* @param string[] $headers List of headers
* @return string|false Contents of the header or false if it does not exist
*/
private function getHeader($name, $headers)
{
$headers = array_change_key_case($headers);
$name = strtolower($name);
return isset($headers[$name]) ? (string) $headers[$name] : false;
}
}