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<?php
/**
* PasswordAdmission.class.php
*
* Represents a rule for course access with a given password.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author Thomas Hackl <thomas.hackl@uni-passau.de>
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
*/
require_once 'vendor/phpass/PasswordHash.php';
class PasswordAdmission extends AdmissionRule
{
// --- ATTRIBUTES ---
/*
* Password hasher (phpass library)
*/
public $hasher = null;
/*
* Crypted password.
*/
public $password = '';
// --- OPERATIONS ---
public $new = false;
/**
* Standard constructor.
*
* @param String ruleId
*/
public function __construct($ruleId='', $courseSetId = '')
{
parent::__construct($ruleId, $courseSetId);
$this->default_message = _('Das eingegebene Passwort ist falsch.');
// Create a new bcrypt password hasher (exclude weaker algorithms).
$this->hasher = new PasswordHash(8, false);
if ($ruleId) {
$this->load();
} else {
$this->id = $this->generateId('passwordadmissions');
$this->new = true;
}
}
/**
* Deletes the admission rule and all associated data.
*/
public function delete() {
parent::delete();
// Delete rule data.
$stmt = DBManager::get()->prepare("DELETE FROM `passwordadmissions`
WHERE `rule_id`=?");
$stmt->execute([$this->id]);
}
/**
* Gets some text that describes what this AdmissionRule (or respective
* subclass) does.
*/
public static function getDescription() {
return _("Mit dieser Anmelderegel können Sie ein Passwort für Zugang ".
"zu den zugeordneten Veranstaltungen vergeben. Die Anmeldung ist ".
"dann nur für Personen möglich, die dieses Passwort kennen.");
}
/**
* Shows an input form where the user can enter a password and try to get
* past the holy gates.
*
* @return String A template-based input form.
*/
public function getInput() {
$factory = new Flexi\Factory(dirname(__FILE__).'/templates/');
$tpl = $factory->open('input');
$tpl->set_attribute('rule', $this);
return $tpl->render();
}
/**
* Return this rule's name.
*/
public static function getName() {
return _("Anmeldung mit Passwort");
}
/**
* Gets the bcrypted hash of the current password.
*
* @return String
*/
public function getPassword() {
return $this->password;
}
/**
* Gets the template that provides a configuration GUI for this rule.
*
* @return String
*/
public function getTemplate() {
// Open generic admission rule template.
$tpl = $GLOBALS['template_factory']->open('admission/rules/configure');
$tpl->set_attribute('rule', $this);
$factory = new Flexi\Factory(dirname(__FILE__).'/templates/');
// Now open specific template for this rule and insert base template.
$tpl2 = $factory->open('configure');
$tpl2->set_attribute('rule', $this);
$tpl2->set_attribute('tpl', $tpl->render());
return $tpl2->render();
}
/**
* Internal helper function for loading rule definition from database.
*/
public function load() {
$stmt = DBManager::get()->prepare("SELECT * FROM `passwordadmissions`
WHERE `rule_id`=? LIMIT 1");
$stmt->execute([$this->id]);
if ($current = $stmt->fetch(PDO::FETCH_ASSOC)) {
$this->message = $current['message'];
$this->startTime = $current['start_time'];
$this->endTime = $current['end_time'];
$this->password = $current['password'];
}
}
/**
* Does the current rule allow the given user to register as participant
* in the given course? Here, a given password (via the getInput method) is
* compared to the stored encrypted one.
*
* @param String userId
* @param String courseId
* @return array
*/
public function ruleApplies($userId, $courseId)
{
$errors = [];
if ($this->checkTimeFrame()) {
if (Request::get('pwarule_password') === null) {
$errors[] = _('Die Eingabe eines Passwortes ist erforderlich.');
} else {
CSRFProtection::verifyUnsafeRequest();
$pwcheck = $this->hasher->CheckPassword(Request::get('pwarule_password'),
$this->getPassword());
//migrated passwords
$pwcheck_m = $this->hasher->CheckPassword(md5(Request::get('pwarule_password')),
$this->getPassword());
if (!($pwcheck || $pwcheck_m)) {
$errors[] = $this->getMessage();
}
}
}
return $errors;
}
/**
* Uses the given data to fill the object values. This can be used
* as a generic function for storing data if the concrete rule type
* isn't known in advance.
*
* @param Array $data
* @return AdmissionRule This object.
*/
public function setAllData($data) {
parent::setAllData($data);
if ($this->new || $data['password1'] !== '') {
$this->setPassword($data['password1']);
}
return $this;
}
/**
* Sets the password by bcrypting the given clear text password.
*
* @param String $clearText The clear text password to be set.
* @return PasswordAdmission
*/
public function setPassword($clearText) {
$this->password = $this->hasher->HashPassword($clearText);
return $this;
}
/**
* Helper function for storing data to DB.
*/
public function store() {
// Store data.
$stmt = DBManager::get()->prepare("INSERT INTO `passwordadmissions`
(`rule_id`, `message`, `start_time`, `end_time`, `password`,
`mkdate`, `chdate`)
VALUES (?, ?, ?, ?, ?, ?, ?) ON DUPLICATE KEY UPDATE
`message`=VALUES(`message`), `start_time`=VALUES(`start_time`),
`end_time`=VALUES(`end_time`), `password`=VALUES(`password`),
`chdate`=VALUES(`chdate`)");
$stmt->execute([$this->id, $this->message, (int)$this->startTime, (int)$this->endTime, $this->password,
time(), time()]);
return $this;
}
/**
* A textual description of the current rule.
*
* @return String
*/
public function toString() {
$factory = new Flexi\Factory(dirname(__FILE__).'/templates/');
$tpl = $factory->open('info');
$tpl->set_attribute('rule', $this);
return $tpl->render();
}
/**
* Validates if the given request data is sufficient to configure this rule
* (e.g. if required values are present).
*
* @param Array Request data
* @return Array Error messages.
*/
public function validate($data)
{
$errors = parent::validate($data);
if ($data['password1'] === '' && $this->new) {
$errors[] = _('Das Passwort darf nicht leer sein.');
}
if ($data['password1'] !== $data['password2']) {
$errors[] = _('Das Passwort stimmt nicht mit der Wiederholung überein.');
}
return $errors;
}
}
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