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mirror of https://git.d3data.de/3rdParty/captcha-module.git synced 2024-12-22 20:36:16 +01:00
captcha-module/core/oecaptcha.php

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<?php
/**
* #PHPHEADER_OECAPTCHA_LICENSE_INFORMATION#
*/
/**
* Class handling CAPTCHA image
* This class requires utility file utils/verificationimg.php as image generator
*
*/
class oeCaptcha extends oxSuperCfg
{
/**
* CAPTCHA length
*
* @var int
*/
protected $macLength = 5;
/**
* Captcha text
*
* @var string
*/
protected $text = null;
/**
* Possible CAPTCHA chars, no ambiguities
*
* @var string
*/
protected $macChars = 'abcdefghijkmnpqrstuvwxyz23456789';
/**
* Captcha timeout 60 * 5 = 5 minutes
*
* @var int
*/
protected $timeout = 300;
/**
* Returns text
*
* @return string
*/
public function getText()
{
if (!$this->text) {
$this->text = '';
for ($i = 0; $i < $this->macLength; $i++) {
$this->text .= strtolower($this->macChars{rand(0, strlen($this->macChars) - 1)});
}
}
return $this->text;
}
/**
* Returns text hash
*
* @param string $text User supplie text
*
* @return string
*/
public function getHash($text = null)
{
// inserting captcha record
$time = time() + $this->timeout;
$textHash = $this->getTextHash($text);
// if session is started - storing captcha info here
$session = $this->getSession();
if ($session->isSessionStarted()) {
$hash = oxUtilsObject::getInstance()->generateUID();
$hashArray = $session->getVariable('captchaHashes');
$hashArray[$hash] = array($textHash => $time);
$session->setVariable('captchaHashes', $hashArray);
} else {
$database = oxDb::getDb();
$query = "insert into oecaptcha (oxhash, oxtime) values (" .
$database->quote($textHash) . ", " . $database->quote($time) . ")";
$database->execute($query);
$hash = $database->getOne('select LAST_INSERT_ID()', false, false);
}
return $hash;
}
/**
* Returns given string captcha hash
*
* @param string $text string to hash
*
* @return string
*/
public function getTextHash($text)
{
if (!$text) {
$text = $this->getText();
}
$text = strtolower($text);
return md5('ox' . $text);
}
/**
* Returns url to CAPTCHA image generator.
*
* @return string
*/
public function getImageUrl()
{
$url = $this->getConfig()->getCurrentShopUrl() . 'modules/oe/captcha/core/utils/verificationimg.php?e_mac=';
$key = $this->getConfig()->getConfigParam('oecaptchakey');
$key = empty($key) ? null : $key;
$url .= oxRegistry::getUtils()->strMan($this->getText(), $key);
return $url;
}
/**
* Checks if image could be generated
*
* @return bool
*/
public function isImageVisible()
{
return ((function_exists('imagecreatetruecolor') || function_exists('imagecreate')) && $this->getConfig()->getConfigParam('iUseGDVersion') > 1);
}
/**
* Check if captcha is passed.
*
* @return bool
*/
public function passCaptcha($displayError = true)
{
$return = true;
// spam spider prevention
$mac = $this->getConfig()->getRequestParameter('c_mac');
$macHash = $this->getConfig()->getRequestParameter('c_mach');
if (!$this->pass($mac, $macHash)) {
$return = false;
}
if (!$return && $displayError) {
// even if there is no exception, use this as a default display method
oxRegistry::get('oxUtilsView')->addErrorToDisplay('MESSAGE_WRONG_VERIFICATION_CODE');
}
return $return;
}
/**
* Verifies captcha input vs supplied hash. Returns true on success.
*
* @param string $mac User supplied text
* @param string $macHash Generated hash
*
* @return bool
*/
protected function pass($mac, $macHash)
{
$time = time();
$hash = $this->getTextHash($mac);
$pass = $this->passFromSession($macHash, $hash, $time);
// if captcha info was NOT stored in session
if ($pass === null) {
$pass = $this->passFromDb((int) $macHash, $hash, $time);
}
return (bool) $pass;
}
/**
* Checks for session captcha hash validity
*
* @param string $macHash hash key
* @param string $hash captcha hash
* @param int $time check time
*
* @return bool
*/
protected function passFromSession($macHash, $hash, $time)
{
$pass = null;
$session = $this->getSession();
if (($hashArray = $session->getVariable('captchaHashes'))) {
$pass = (isset($hashArray[$macHash][$hash]) && $hashArray[$macHash][$hash] >= $time) ? true : false;
unset($hashArray[$macHash]);
if (!empty($hashArray)) {
$session->setVariable('captchaHashes', $hashArray);
} else {
$session->deleteVariable('captchaHashes');
}
}
return $pass;
}
/**
* Checks for DB captcha hash validity
*
* @param int $macHash hash key
* @param string $hash captcha hash
* @param int $time check time
*
* @return bool
*/
protected function passFromDb($macHash, $hash, $time)
{
$database = oxDb::getDb();
$where = "where oxid = " . $database->quote($macHash) . " and oxhash = " . $database->quote($hash);
$query = "select 1 from oecaptcha " . $where;
$pass = (bool) $database->getOne($query, false, false);
if ($pass) {
// cleanup
$query = "delete from oecaptcha " . $where;
$database->execute($query);
}
// garbage cleanup
$query = "delete from oecaptcha where oxtime < $time";
$database->execute($query);
return $pass;
}
}