moodle/mod/quiz/attempt.php

<?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/>.

/**
 * This script displays a particular page of a quiz attempt that is in progress.
 *
 * @package    mod
 * @subpackage quiz
 * @copyright  1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(dirname(__FILE__) . '/../../config.php');
require_once($CFG->dirroot . '/mod/quiz/locallib.php');

// Look for old-style URLs, such as may be in the logs, and redirect them to startattemtp.php
if ($id = optional_param('id', 0, PARAM_INTEGER)) {
    redirect($CFG->wwwroot . '/mod/quiz/startattempt.php?cmid=' . $id . '&sesskey=' . sesskey());
} else if ($qid = optional_param('q', 0, PARAM_INTEGER)) {
    if (!$cm = get_coursemodule_from_instance('quiz', $qid)) {
        print_error('invalidquizid', 'quiz');
    }
    redirect($CFG->wwwroot . '/mod/quiz/startattempt.php?cmid=' . $cm->id . '&sesskey=' . sesskey());
}

// Get submitted parameters.
$attemptid = required_param('attempt', PARAM_INT);
$page = optional_param('page', 0, PARAM_INT);

$attemptobj = quiz_attempt::create($attemptid);
$PAGE->set_url($attemptobj->attempt_url(0, $page));

// Check login.
require_login($attemptobj->get_course(), false, $attemptobj->get_cm());

// Check that this attempt belongs to this user.
if ($attemptobj->get_userid() != $USER->id) {
    if ($attemptobj->has_capability('mod/quiz:viewreports')) {
        redirect($attemptobj->review_url(0, $page));
    } else {
        throw new moodle_quiz_exception($attemptobj->get_quizobj(), 'notyourattempt');
    }
}

// Check capabilities and block settings
if (!$attemptobj->is_preview_user()) {
    $attemptobj->require_capability('mod/quiz:attempt');
    if (empty($attemptobj->get_quiz()->showblocks)) {
        $PAGE->blocks->show_only_fake_blocks();
    }

} else {
    navigation_node::override_active_url($attemptobj->start_attempt_url());
}

// If the attempt is already closed, send them to the review page.
if ($attemptobj->is_finished()) {
    redirect($attemptobj->review_url(0, $page));
}

// Check the access rules.
$accessmanager = $attemptobj->get_access_manager(time());
$messages = $accessmanager->prevent_access();
if (!$attemptobj->is_preview_user() && $messages) {
    print_error('attempterror', 'quiz', $attemptobj->view_url(),
            $accessmanager->print_messages($messages, true));
}
$accessmanager->do_password_check($attemptobj->is_preview_user());

add_to_log($attemptobj->get_courseid(), 'quiz', 'continue attempt',
        'review.php?attempt=' . $attemptobj->get_attemptid(),
        $attemptobj->get_quizid(), $attemptobj->get_cmid());

// Get the list of questions needed by this page.
$slots = $attemptobj->get_slots($page);

// Check.
if (empty($slots)) {
    throw new moodle_quiz_exception($attemptobj->get_quizobj(), 'noquestionsfound');
}

// Initialise the JavaScript.
$headtags = $attemptobj->get_html_head_contributions($page);
$PAGE->requires->js_init_call('M.mod_quiz.init_attempt_form', null, false, quiz_get_js_module());

// Arrange for the navigation to be displayed.
$navbc = $attemptobj->get_navigation_panel('quiz_attempt_nav_panel', $page);
$firstregion = reset($PAGE->blocks->get_regions());
$PAGE->blocks->add_fake_block($navbc, $firstregion);

// Print the page header
$title = get_string('attempt', 'quiz', $attemptobj->get_attempt_number());
$headtags = $attemptobj->get_html_head_contributions($page);
$PAGE->set_heading($attemptobj->get_course()->fullname);
if ($accessmanager->securewindow_required($attemptobj->is_preview_user())) {
    $accessmanager->setup_secure_page($attemptobj->get_course()->shortname . ': ' .
            format_string($attemptobj->get_quiz_name()));

} else if ($accessmanager->safebrowser_required($attemptobj->is_preview_user())) {
    $PAGE->set_title($attemptobj->get_course()->shortname . ': '.format_string($attemptobj->get_quiz_name()));
    $PAGE->set_cacheable(false);
    echo $OUTPUT->header();

} else {
    $PAGE->set_title(format_string($attemptobj->get_quiz_name()));
    echo $OUTPUT->header();
}

if ($attemptobj->is_preview_user() && $messages) {
    // Inform teachers of any restrictions that would apply to students at this point.
    echo $OUTPUT->box_start('quizaccessnotices');
    echo $OUTPUT->heading(get_string('accessnoticesheader', 'quiz'), 3);
    $accessmanager->print_messages($messages);
    echo $OUTPUT->box_end();
}

// Start the form
echo '<form id="responseform" method="post" action="', s($attemptobj->processattempt_url()),
        '" enctype="multipart/form-data" accept-charset="utf-8">', "\n";
echo '<div>';

// Print all the questions
foreach ($slots as $slot) {
    echo $attemptobj->render_question($slot, false, $attemptobj->attempt_url($id, $page));
}

// Print a link to the next page.
echo '<div class="submitbtns">';
if ($attemptobj->is_last_page($page)) {
    $nextpage = -1;
} else {
    $nextpage = $page + 1;
}
echo '<input type="submit" name="next" value="' . get_string('next') . '" />';
echo "</div>";

// Some hidden fields to trach what is going on.
echo '<input type="hidden" name="attempt" value="' . $attemptobj->get_attemptid() . '" />';
echo '<input type="hidden" name="thispage" value="' . $page . '" />';
echo '<input type="hidden" name="nextpage" id="nextpagehiddeninput" value="' . $nextpage . '" />';
echo '<input type="hidden" name="timeup" id="timeup" value="0" />';
echo '<input type="hidden" name="sesskey" value="' . sesskey() . '" />';
echo '<input type="hidden" name="scrollpos" id="scrollpos" value="" />';

// Add a hidden field with questionids. Do this at the end of the form, so
// if you navigate before the form has finished loading, it does not wipe all
// the student's answers.
echo '<input type="hidden" name="slots" value="' .
        implode(',', $slots) . "\" />\n";

// Finish the form
echo '</div>';
echo "</form>\n";

// Finish the page
$accessmanager->show_attempt_timer_if_needed($attemptobj->get_attempt(), time());
echo $OUTPUT->footer();