view.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/>.

/**
 * Prints an instance of mod_gcanvas.
 *
 * @package     mod_gcanvas
 * @copyright   2018 Luuk Verhoeven - LdesignMedia.nl / MFreak.nl <luuk@ldesignmedia.nl>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

use mod_gcanvas\helper;

require(__DIR__ . '/../../config.php');
require_once(__DIR__ . '/lib.php');
require_once(__DIR__ . "/../../repository/lib.php");
require_once("$CFG->libdir/filelib.php");

defined('MOODLE_INTERNAL') || die;

// Course_module ID.
$id = optional_param('id', 0, PARAM_INT);
$g = optional_param('g', 0, PARAM_INT);
$action = optional_param('action', '', PARAM_ALPHA);

if ($id) {
    $cm = get_coursemodule_from_id('gcanvas', $id, 0, false, MUST_EXIST);
    $course = $DB->get_record('course', ['id' => $cm->course], '*', MUST_EXIST);
    $canvas = $DB->get_record('gcanvas', ['id' => $cm->instance], '*', MUST_EXIST);
} else if ($g) {
    $canvas = $DB->get_record('gcanvas', ['id' => $g], '*', MUST_EXIST);
    $course = $DB->get_record('course', ['id' => $canvas->course], '*', MUST_EXIST);
    $cm = get_coursemodule_from_instance('gcanvas', $canvas->id, $course->id, false, MUST_EXIST);
} else {
    throw new moodle_exception('missingidandcmid', mod_gcanvas);
}

require_login($course, true, $cm);

$modulecontext = context_module::instance($cm->id);

$event = \mod_gcanvas\event\course_module_viewed::create([
    'objectid' => $canvas->id,
    'context' => $modulecontext,
]);
$event->add_record_snapshot('course', $course);
$event->add_record_snapshot('gcanvas', $canvas);
$event->trigger();

$PAGE->requires->css('/mod/gcanvas/css/spectrum.css');
$PAGE->set_url('/mod/gcanvas/view.php', [
    'id' => $cm->id,
    'action' => $action,
    'g' => $g,
]);
$PAGE->set_title(format_string($canvas->name));
$PAGE->set_heading(format_string($course->fullname));
$PAGE->set_context($modulecontext);

$fileoptions = [
    'subdirs' => 1,
    'maxbytes' => $CFG->maxbytes,
    'maxfiles' => -1,
    'changeformat' => 1,
    'context' => $modulecontext,
    'noclean' => 1,
    'trusttext' => 0,
];

$renderer = $PAGE->get_renderer('mod_gcanvas');

switch ($action) {

    case 'intro':
        has_capability('mod/gcanvas:teacher', $PAGE->context);

        $form = new \mod_gcanvas\form\intro($PAGE->url);
        $draftitemid = file_get_submitted_draft_itemid('helptext');
        $form->set_data((object) [
            'helptext' => [
                'text' => file_prepare_draft_area($draftitemid, $PAGE->context->id, 'mod_gcanvas',
                    'helptext', 0, $fileoptions, $canvas->helptext),
                'format' => FORMAT_HTML,
                'itemid' => $draftitemid,
            ],
        ]);

        if ($form->is_cancelled()) {
            redirect(new moodle_url($PAGE->url, ['id' => $id, 'action' => '']));
        }

        if (($data = $form->get_data())) {

            // Convert draft to final.
            $draftitemid = $data->helptext['itemid'];
            $data->helptext['text'] = file_save_draft_area_files($draftitemid, $modulecontext->id,
                'mod_gcanvas', 'helptext', 0, $fileoptions, $data->helptext['text']);

            $DB->update_record('gcanvas', (object) [
                'id' => $canvas->id,
                'helptext' => $data->helptext['text'],
            ]);

            redirect(new moodle_url($PAGE->url, [
                'id' => $id,
                'action' => '',
            ]));
        }

        echo $OUTPUT->header();
        $form->display();
        echo $OUTPUT->footer();

        break;

    default:

        $renderer->add_javascript_helper($canvas);

        // Handle file uploads directly.
        if (($data = data_submitted()) && confirm_sesskey()) {

            $filearea = $data->filearea;
            helper::upload_file($data->filearea, $data->$filearea);

            // Prevent resubmission.
            redirect($PAGE->url);
        }

        echo $OUTPUT->header();

        if (get_config('moodle', 'version') < helper::MOODLE_40) {
            // Info box, only needs to show before Moodle 4.0.
            $content = format_module_intro('gcanvas', $canvas, $cm->id);
            if (!empty($content)) {
                echo $OUTPUT->box($content, 'generalbox', 'intro');
            }
        }

        echo $renderer->render_canvas($canvas);
        echo $renderer->render_uploader('background', $canvas);
        echo $renderer->render_uploader('student_image', $canvas);
        echo $renderer->render_uploader('toolbar_shape', $canvas);
        echo $OUTPUT->footer();
}