silverstripe-framework/core/startup/ParameterConfirmationToken.php

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<?php
/**
* Class ParameterConfirmationToken
*
* When you need to use a dangerous GET parameter that needs to be set before core/Core.php is
* established, this class takes care of allowing some other code of confirming the parameter,
* by generating a one-time-use token & redirecting with that token included in the redirected URL
*
* WARNING: This class is experimental and designed specifically for use pre-startup in main.php
* It will likely be heavily refactored before the release of 3.2
*/
class ParameterConfirmationToken {
protected $parameterName = null;
protected $parameter = null;
protected $token = null;
protected function pathForToken($token) {
return TEMP_FOLDER.'/token_'.preg_replace('/[^a-z0-9]+/', '', $token);
}
protected function genToken() {
// Generate a new random token (as random as possible)
require_once(dirname(dirname(dirname(__FILE__))).'/security/RandomGenerator.php');
$rg = new RandomGenerator();
$token = $rg->randomToken('md5');
// Store a file in the session save path (safer than /tmp, as open_basedir might limit that)
file_put_contents($this->pathForToken($token), $token);
return $token;
}
protected function checkToken($token) {
$file = $this->pathForToken($token);
$content = null;
if (file_exists($file)) {
$content = file_get_contents($file);
unlink($file);
}
return $content == $token;
}
public function __construct($parameterName) {
// Store the parameter name
$this->parameterName = $parameterName;
// Store the parameter value
$this->parameter = isset($_GET[$parameterName]) ? $_GET[$parameterName] : null;
// Store the token
$this->token = isset($_GET[$parameterName.'token']) ? $_GET[$parameterName.'token'] : null;
// If a token was provided, but isn't valid, ignore it
if ($this->token && (!$this->checkToken($this->token))) $this->token = null;
}
public function parameterProvided() {
return $this->parameter !== null;
}
public function tokenProvided() {
return $this->token !== null;
}
public function params() {
return array(
$this->parameterName => $this->parameter,
$this->parameterName.'token' => $this->genToken()
);
}
public function reloadWithToken() {
global $url;
// Are we http or https?
$proto = 'http';
if(isset($_SERVER['HTTP_X_FORWARDED_PROTOCOL'])) {
if(strtolower($_SERVER['HTTP_X_FORWARDED_PROTOCOL']) == 'https') $proto = 'https';
}
if((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off')) $proto = 'https';
if(isset($_SERVER['SSL'])) $proto = 'https';
// What's our host
$host = $_SERVER['HTTP_HOST'];
// What's our GET params (ensuring they include the original parameter + a new token)
$params = array_merge($_GET, $this->params());
unset($params['url']);
// Join them all together into the original URL
$location = "$proto://" . $host . BASE_URL . $url . ($params ? '?'.http_build_query($params) : '');
// And redirect
if (headers_sent()) {
echo "
<script>location.href='$location';</script>
<noscript><meta http-equiv='refresh' content='0; url=$location'></noscript>
You are being redirected. If you are not redirected soon, <a href='$location'>click here to continue the flush</a>
";
}
else header('location: '.$location, true, 302);
die;
}
}