MDL-80948: Launch to SEB continues session.

mod/quiz/accessrule/seb/classes/continue_session.php

@@ -0,0 +1,81 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle 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 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+namespace quizaccess_seb;
+
+/**
+ * Class continue_session
+ *
+ * @package    quizaccess_seb
+ * @copyright  2024 Michael Kotlyar <[email protected]>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class continue_session {
+
+    const SCRIPT = 'seb';
+
+    public static function create_sessionkey($userid) {
+        global $CFG;
+
+        // Security checks.
+        require_login();
+
+        // Generate URL.
+        $user = get_complete_user_data('id', $userid, $CFG->mnet_localhost_id, true);
+
+        $userid = $user->id;
+        $iprestriction = $user->lastip ?: getremoteaddr();
+        $validuntil = time() + 60;
+
+        return create_user_key(self::SCRIPT, $userid, $userid, $iprestriction, $validuntil);
+    }
+
+
+    /**
+     * Logs a user in using userkey and redirects after.
+     *
+     * @throws \moodle_exception If something went wrong.
+     */
+    public static function handle_sessionkey($key, $userid) {
+        global $CFG;
+
+        // Validate key.
+        try {
+            $key = validate_user_key($key, self::SCRIPT, $userid);
+        } catch (\moodle_exception $exception) {
+            // If user is logged in and key is not valid, we'd like to logout a user.
+            if (isloggedin()) {
+                require_logout();
+            }
+            throw $exception;
+        }
+
+        // Validate and login user.
+        if (isloggedin()) {
+            global $USER;
+            if ($USER->id != $key->userid) {
+                // Logout the current user if it's different to one that associated to the valid key.
+                require_logout();
+            }
+        } else {
+            $user = get_complete_user_data('id', $key->userid, $CFG->mnet_localhost_id, true);
+            complete_user_login($user);
+        }
+
+        // Delete keys.
+        delete_user_key(self::SCRIPT, $userid);
+    }
+}

mod/quiz/accessrule/seb/lang/en/quizaccess_seb.php

@@ -187,6 +187,8 @@
 $string['sebrequired'] = "This quiz has been configured so that students may only attempt it using the Safe Exam Browser.";
 $string['setting:autoreconfigureseb'] = 'Auto-configure SEB';
 $string['setting:autoreconfigureseb_desc'] = 'If enabled, users who navigate to the quiz using the Safe Exam Browser will be automatically forced to reconfigure their Safe Exam Browser.';
+$string['setting:continuesessionwhenlaunchseb'] = 'Continue session when launching Safe Exam Browser';
+$string['setting:continuesessionwhenlaunchseb_desc'] = 'If enabled, users will not have to re-login when launching the quiz in their Safe Exam Browser';
 $string['setting:displayblocksbeforestart'] = 'Display blocks before starting quiz';
 $string['setting:displayblocksbeforestart_desc'] = 'If enabled, blocks will be displayed before a user attempts the quiz.';
 $string['setting:displayblockswhenfinished'] = 'Display blocks after finishing quiz';

mod/quiz/accessrule/seb/redirect.php

@@ -0,0 +1,41 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle 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 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * TODO describe file redirect
+ *
+ * @package    quizaccess_seb
+ * @copyright  2024 Michael Kotlyar <[email protected]>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+require('../../../../config.php');
+
+use \quizaccess_seb\continue_session;
+
+$key = required_param('key', PARAM_TEXT);
+$userid = required_param('userid', PARAM_INT);
+$cmid = required_param('cmid', PARAM_INT);
+
+// Verify and login.
+try {
+    continue_session::handle_sessionkey($key, $userid);
+} catch (exception $e) {
+    header("Location: {$CFG->wwwroot}");
+    exit;
+}
+
+redirect(new \moodle_url('/mod/quiz/accessrule/seb/config.php', ['cmid' => $cmid]));

mod/quiz/accessrule/seb/rule.php

@@ -547,7 +547,18 @@ private function get_download_seb_button(): string {
      */
     private function get_launch_seb_button(): string {
         // Rendering as a href and not as button in a form to circumvent browser warnings for sending to URL with unknown protocol.
-        $seblink = \quizaccess_seb\link_generator::get_link($this->quiz->cmid, true, is_https());
+        $continuesession = get_config('quizaccess_seb', 'continuesessionwhenlaunchseb');
+        if ($continuesession) {
+            global $USER;
+            $key = \quizaccess_seb\continue_session::create_sessionkey($USER->id, $this->quiz->cmid);
+            $seblink = new moodle_url(
+                '/mod/quiz/accessrule/seb/redirect.php',
+                ['key' => $key, 'userid' => $USER->id, 'cmid' => $this->quiz->cmid],
+            );
+            $seblink->set_scheme('sebs');
+        } else {
+            $seblink = \quizaccess_seb\link_generator::get_link($this->quiz->cmid, false, is_https());
+        }
 
         $buttonlink = html_writer::start_tag('div', ['class' => 'singlebutton']);
         $buttonlink .= html_writer::link($seblink, get_string('seblinkbutton', 'quizaccess_seb'),

mod/quiz/accessrule/seb/settings.php

@@ -69,6 +69,12 @@
         get_string('setting:displayblockswhenfinished', 'quizaccess_seb'),
         get_string('setting:displayblockswhenfinished_desc', 'quizaccess_seb'),
         '1'));
+
+    $settings->add(new admin_setting_configcheckbox('quizaccess_seb/continuesessionwhenlaunchseb',
+        get_string('setting:continuesessionwhenlaunchseb', 'quizaccess_seb'),
+        get_string('setting:continuesessionwhenlaunchseb_desc', 'quizaccess_seb'),
+        '1'));
+
 }
 
 if (has_capability('quizaccess/seb:managetemplates', context_system::instance())) {

mod/quiz/accessrule/seb/version.php

@@ -25,7 +25,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version = 2024100700;
+$plugin->version = 2024110700;
 $plugin->requires = 2024100100;
 $plugin->component = 'quizaccess_seb';
 $plugin->maturity = MATURITY_STABLE;