Lesson.php — Tutor LMS – eLearning and online course solution 3.9.8

tutor / classes / Lesson.php

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Lesson.php

755 lines

1	<?php
2	/**
3	* Manage Lesson
4	*
5	* @package Tutor
6	* @author Themeum <support@themeum.com>
7	* @link https://themeum.com
8	* @since 1.0.0
9	*/
10
11	namespace TUTOR;
12
13	if ( ! defined( 'ABSPATH' ) ) {
14	exit;
15	}
16
17	use Tutor\Helpers\HttpHelper;
18	use Tutor\Helpers\ValidationHelper;
19	use Tutor\Models\LessonModel;
20	use Tutor\Traits\JsonResponse;
21
22	/**
23	* Lesson class
24	*
25	* @since 1.0.0
26	*/
27	class Lesson extends Tutor_Base {
28	use JsonResponse;
29
30	/**
31	* Register hooks
32	*
33	* @since 1.0.0
34	* @since 3.7.0 param register hook added.
35	*
36	* @param bool $register_hooks register hooks or not.
37	*
38	* @return void
39	*/
40	public function __construct( $register_hooks = true ) {
41	parent::__construct();
42
43	if ( ! $register_hooks ) {
44	return;
45	}
46
47	add_action( 'save_post_' . $this->lesson_post_type, array( $this, 'save_lesson_meta' ) );
48
49	add_action( 'wp_ajax_tutor_lesson_details', array( $this, 'ajax_lesson_details' ) );
50	add_action( 'wp_ajax_tutor_save_lesson', array( $this, 'ajax_save_lesson' ) );
51	add_action( 'wp_ajax_tutor_delete_lesson', array( $this, 'ajax_delete_lesson' ) );
52
53	add_filter( 'get_sample_permalink', array( $this, 'change_lesson_permalink' ), 10, 2 );
54
55	/**
56	* Frontend Action
57	*/
58	add_action( 'template_redirect', array( $this, 'mark_lesson_complete' ) );
59
60	add_action( 'wp_ajax_tutor_render_lesson_content', array( $this, 'tutor_render_lesson_content' ) );
61
62	/**
63	* For public course access
64	*/
65	add_action( 'wp_ajax_nopriv_tutor_render_lesson_content', array( $this, 'tutor_render_lesson_content' ) );
66
67	/**
68	* Autoplay next video
69	*
70	* @since 1.4.9
71	*/
72	add_action( 'wp_ajax_autoload_next_course_content', array( $this, 'autoload_next_course_content' ) );
73
74	/**
75	* Load next course item after click complete button
76	*
77	* @since 1.5.3
78	*/
79	add_action( 'tutor_lesson_completed_after', array( $this, 'tutor_lesson_completed_after' ), 999 );
80
81	/**
82	* Lesson comment & reply ajax handler
83	*
84	* @since 2.0.0
85	*/
86	add_action( 'wp_ajax_tutor_single_course_lesson_load_more', array( $this, 'tutor_single_course_lesson_load_more' ) );
87	add_action( 'wp_ajax_tutor_create_lesson_comment', array( $this, 'tutor_single_course_lesson_load_more' ) );
88	add_action( 'wp_ajax_tutor_reply_lesson_comment', array( $this, 'reply_lesson_comment' ) );
89	}
90
91	/**
92	* Manage load more & comment create
93	*
94	* @since 2.0.6
95	* @return void send wp json data
96	*/
97	public function tutor_single_course_lesson_load_more() {
98	tutor_utils()->checking_nonce();
99	$comment = Input::post( 'comment', '', Input::TYPE_KSES_POST );
100	if ( 'tutor_create_lesson_comment' === Input::post( 'action' ) && strlen( $comment ) > 0 ) {
101	$comment_data = array(
102	'comment_content' => $comment,
103	'comment_post_ID' => Input::post( 'comment_post_ID', 0, Input::TYPE_INT ),
104	'comment_parent' => Input::post( 'comment_parent', 0, Input::TYPE_INT ),
105	);
106	self::create_comment( $comment_data );
107	do_action( 'tutor_new_comment_added', $comment_data );
108	}
109	ob_start();
110	tutor_load_template( 'single.lesson.comment' );
111	$html = ob_get_clean();
112	wp_send_json_success( array( 'html' => $html ) );
113	}
114
115	/**
116	* Saving lesson meta and assets
117	*
118	* @since 1.0.0
119	*
120	* @param integer $post_ID post ID.
121	*
122	* @return void
123	*/
124	public function save_lesson_meta( $post_ID ) {
125	$thumbnail_id = Input::post( 'thumbnail_id', 0, Input::TYPE_INT );
126	if ( $thumbnail_id ) {
127	update_post_meta( $post_ID, '_thumbnail_id', $thumbnail_id );
128	} else {
129	delete_post_meta( $post_ID, '_thumbnail_id' );
130	}
131
132	$video_source = sanitize_text_field( tutor_utils()->array_get( 'video.source', $_POST ) ); //phpcs:ignore
133	if ( '-1' === $video_source ) {
134	delete_post_meta( $post_ID, '_video' );
135	} elseif ( $video_source ) {
136
137	// Sanitize data through helper method.
138	$video = Input::sanitize_array(
139	$_POST['video'] ?? array(), //phpcs:ignore
140	array(
141	'source_external_url' => 'esc_url',
142	'source_embedded' => 'wp_kses_post',
143	),
144	true
145	);
146	update_post_meta( $post_ID, '_video', $video );
147	}
148
149	// Attachments.
150	$attachments = array();
151	// phpcs:disable WordPress.Security.NonceVerification.Missing
152	if ( ! empty( $_POST['tutor_attachments'] ) ) {
153	//phpcs:ignore -- data sanitized through helper method.
154	$attachments = tutor_utils()->sanitize_array( wp_unslash( $_POST['tutor_attachments'] ) );
155	$attachments = array_unique( $attachments );
156	}
157
158	/**
159	* If !empty attachment then update meta else
160	* delete meta key to prevent empty data in db
161	*
162	* @since 1.8.9
163	*/
164	if ( ! empty( $attachments ) ) {
165	update_post_meta( $post_ID, '_tutor_attachments', $attachments );
166	} else {
167	delete_post_meta( $post_ID, '_tutor_attachments' );
168	}
169	}
170
171	/**
172	* Get lesson details data.
173	*
174	* @since 3.0.0
175	*
176	* @return void
177	*/
178	public function ajax_lesson_details() {
179	if ( ! tutor_utils()->is_nonce_verified() ) {
180	$this->json_response( tutor_utils()->error_message( 'nonce' ), null, HttpHelper::STATUS_BAD_REQUEST );
181	}
182
183	$topic_id = Input::post( 'topic_id', 0, Input::TYPE_INT );
184	$lesson_id = Input::post( 'lesson_id', 0, Input::TYPE_INT );
185
186	if ( ! tutor_utils()->can_user_manage( 'topic', $topic_id ) ) {
187	$this->json_response(
188	tutor_utils()->error_message(),
189	null,
190	HttpHelper::STATUS_FORBIDDEN
191	);
192	}
193
194	if ( 0 !== $lesson_id ) {
195	if ( ! tutor_utils()->can_user_manage( 'lesson', $lesson_id ) ) {
196	$this->json_response(
197	tutor_utils()->error_message(),
198	null,
199	HttpHelper::STATUS_FORBIDDEN
200	);
201	}
202	}
203
204	$data = LessonModel::get_lesson_details( $lesson_id );
205
206	$this->json_response(
207	__( 'Lesson data fetched successfully', 'tutor' ),
208	$data
209	);
210	}
211
212	/**
213	* Create or update lesson.
214	*
215	* @since 1.0.0
216	* @since 1.5.1 updated
217	* @since 3.0.0 refactor and response updated.
218	*
219	* @return void
220	*/
221	public function ajax_save_lesson() {
222	if ( ! tutor_utils()->is_nonce_verified() ) {
223	$this->json_response( tutor_utils()->error_message( 'nonce' ), null, HttpHelper::STATUS_BAD_REQUEST );
224	}
225
226	/**
227	* Allow iframe inside lesson content to support
228	* embed video & other stuff
229	*
230	* @since 2.1.6
231	*/
232	add_filter( 'wp_kses_allowed_html', Input::class . '::allow_iframe', 10, 2 );
233
234	$is_update = false;
235
236	$lesson_id = Input::post( 'lesson_id', 0, Input::TYPE_INT );
237	$topic_id = Input::post( 'topic_id', 0, Input::TYPE_INT );
238
239	if ( $lesson_id ) {
240	$is_update = true;
241	}
242
243	if ( ! tutor_utils()->can_user_manage( 'topic', $topic_id ) ) {
244	$this->json_response(
245	tutor_utils()->error_message(),
246	null,
247	HttpHelper::STATUS_FORBIDDEN
248	);
249	}
250
251	$title = Input::post( 'title' );
252	$description = Input::post( 'description', '', Input::TYPE_KSES_POST );
253	$is_html_active = Input::post( 'is_html_active' ) === 'true' ? true : false;
254	$raw_html_content = Input::post( 'tutor_lesson_modal_editor', '', Input::TYPE_KSES_POST );
255	$post_content = $is_html_active ? $raw_html_content : $description;
256
257	$rules = array(
258	'topic_id' => 'required\|numeric',
259	'lesson_id' => 'if_input\|numeric',
260	);
261
262	//phpcs:ignore WordPress.Security.NonceVerification.Missing
263	$params = Input::sanitize_array( $_POST, array( 'description' => 'wp_kses_post' ) );
264
265	$validation = ValidationHelper::validate( $rules, $params );
266	if ( ! $validation->success ) {
267	$this->json_response(
268	__( 'Invalid inputs', 'tutor' ),
269	$validation->errors,
270	HttpHelper::STATUS_UNPROCESSABLE_ENTITY
271	);
272	}
273
274	$lesson_data = array(
275	'post_type' => $this->lesson_post_type,
276	'post_title' => wp_slash( $title ), // Note: Added wp_slash to support latex syntaxes.
277	'post_name' => sanitize_title( $title ),
278	'post_content' => wp_slash( $post_content ),
279	'post_status' => 'publish',
280	'comment_status' => 'open',
281	'post_author' => get_current_user_id(),
282	'post_parent' => $topic_id,
283	);
284
285	if ( ! $is_update ) {
286	$lesson_data['menu_order'] = tutor_utils()->get_next_course_content_order_id( $topic_id );
287	$lesson_id = wp_insert_post( $lesson_data );
288
289	if ( $lesson_id ) {
290	do_action( 'tutor/lesson/created', $lesson_id );
291	} else {
292	$this->json_response(
293	tutor_utils()->error_message(),
294	null,
295	HttpHelper::STATUS_INTERNAL_SERVER_ERROR
296	);
297	}
298	} else {
299	$lesson_data['ID'] = $lesson_id;
300
301	if ( ! tutor_utils()->can_user_manage( 'lesson', $lesson_id ) ) {
302	$this->json_response(
303	tutor_utils()->error_message(),
304	null,
305	HttpHelper::STATUS_FORBIDDEN
306	);
307	}
308
309	do_action( 'tutor/lesson_update/before', $lesson_id );
310	wp_update_post( $lesson_data );
311	do_action( 'tutor/lesson_update/after', $lesson_id );
312	}
313
314	if ( $is_update ) {
315	$this->json_response(
316	__( 'Lesson updated successfully', 'tutor' ),
317	$lesson_id
318	);
319	} else {
320	$this->json_response(
321	__( 'Lesson created successfully', 'tutor' ),
322	$lesson_id,
323	HttpHelper::STATUS_CREATED
324	);
325	}
326	}
327
328	/**
329	* Delete Lesson from course builder by ID
330	*
331	* @since 1.0.0
332	* @since 3.0.0 refactor and update response.
333	*
334	* @return void
335	*/
336	public function ajax_delete_lesson() {
337	tutor_utils()->check_nonce();
338
339	$lesson_id = Input::post( 'lesson_id', 0, Input::TYPE_INT );
340
341	if ( ! tutor_utils()->can_user_manage( 'lesson', $lesson_id ) ) {
342	$this->json_response(
343	tutor_utils()->error_message(),
344	null,
345	HttpHelper::STATUS_FORBIDDEN
346	);
347	}
348
349	$content = __( 'Lesson', 'tutor' );
350	$post_type = get_post_type( $lesson_id );
351	if ( tutor()->assignment_post_type === $post_type ) {
352	$content = __( 'Assignment', 'tutor' );
353	}
354
355	do_action( 'tutor_before_delete_course_content', 0, $lesson_id );
356
357	wp_delete_post( $lesson_id, true );
358	/* translators: %s refers to the name of the content being deleted */
359	$this->json_response( sprintf( __( '%s deleted successfully', 'tutor' ), $content ) );
360	}
361
362
363	/**
364	* Changed the URI based
365	*
366	* @since 1.0.0
367	*
368	* @param string $uri URI.
369	* @param integer $lesson_id lesson ID.
370	*
371	* @return string
372	*/
373	public function change_lesson_permalink( $uri, $lesson_id ) {
374	$post = get_post( $lesson_id );
375
376	if ( $post && $post->post_type === $this->lesson_post_type ) {
377	$uri_base = trailingslashit( site_url() );
378
379	$sample_course = 'sample-course';
380	$is_course = tutor_utils()->get_course_id_by( 'lesson', get_the_ID() );
381	if ( $is_course ) {
382	$course = get_post( $is_course );
383	if ( $course ) {
384	$sample_course = $course->post_name;
385	}
386	}
387
388	$new_course_base = $uri_base . "course/{$sample_course}/lesson/%pagename%/";
389	$uri[0] = $new_course_base;
390	}
391
392	return $uri;
393	}
394
395	/**
396	* Mark lesson completed
397	*
398	* @since 1.0.0
399	*
400	* @return void
401	*/
402	public function mark_lesson_complete() {
403	if ( 'tutor_complete_lesson' !== Input::post( 'tutor_action' ) ) {
404	return;
405	}
406	// Checking nonce.
407	tutor_utils()->checking_nonce();
408
409	$user_id = get_current_user_id();
410
411	// TODO: need to show view if not signed_in.
412	if ( ! $user_id ) {
413	die( esc_html__( 'Please Sign-In', 'tutor' ) );
414	}
415
416	$lesson_id = Input::post( 'lesson_id', 0, Input::TYPE_INT );
417
418	if ( ! $lesson_id ) {
419	return;
420	}
421
422	$validated = apply_filters( 'tutor_validate_lesson_complete', true, $user_id, $lesson_id );
423	if ( ! $validated ) {
424	return;
425	}
426
427	do_action( 'tutor_lesson_completed_before', $lesson_id );
428	/**
429	* Marking lesson at user meta, meta format, _tutor_completed_lesson_id_{id} and value = tutor_time();
430	*/
431	LessonModel::mark_lesson_complete( $lesson_id );
432
433	do_action( 'tutor_lesson_completed_email_after', $lesson_id, $user_id );
434	do_action( 'tutor_lesson_completed_after', $lesson_id, $user_id );
435	}
436
437	/**
438	* Render the lesson content
439	*
440	* @since 1.0.0
441	*
442	* @return void
443	*/
444	public function tutor_render_lesson_content() {
445	tutor_utils()->checking_nonce();
446
447	$lesson_id = Input::post( 'lesson_id', 0, Input::TYPE_INT );
448
449	$ancestors = get_post_ancestors( $lesson_id );
450	$course_id = ! empty( $ancestors ) ? array_pop( $ancestors ) : $lesson_id;
451
452	// Course must be public or current user must be enrolled to access this lesson.
453	if ( get_post_meta( $course_id, '_tutor_is_public_course', true ) !== 'yes' && ! tutor_utils()->is_enrolled( $course_id ) ) {
454
455	$is_admin = tutor_utils()->has_user_role( 'administrator' );
456	$allowed = $is_admin ? true : tutor_utils()->is_instructor_of_this_course( get_current_user_id(), $course_id );
457
458	if ( ! $allowed ) {
459	http_response_code( 400 );
460	exit;
461	}
462	}
463
464	ob_start();
465	global $post;
466
467	$post = get_post( $lesson_id ); //phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
468	setup_postdata( $post );
469	tutor_lesson_content();
470	wp_reset_postdata();
471
472	$html = ob_get_clean();
473
474	wp_send_json_success( array( 'html' => $html ) );
475	}
476
477	/**
478	* Load next course item automatically
479	*
480	* @since 1.4.9
481	*
482	* @return void
483	*/
484	public function autoload_next_course_content() {
485	tutor_utils()->checking_nonce();
486
487	$post_id = Input::post( 'post_id', 0, Input::TYPE_INT );
488	$content_id = tutor_utils()->get_post_id( $post_id );
489	$contents = tutor_utils()->get_course_prev_next_contents_by_id( $content_id );
490
491	$autoload_course_content = (bool) get_tutor_option( 'autoload_next_course_content' );
492	$next_url = false;
493	if ( $autoload_course_content ) {
494	$next_url = get_the_permalink( $contents->next_id );
495	}
496	wp_send_json_success( array( 'next_url' => $next_url ) );
497	}
498
499	/**
500	* Load next course item after click complete button
501	*
502	* @since 1.5.3
503	*
504	* @param integer $content_id content ID.
505	* @return void
506	*/
507	public function tutor_lesson_completed_after( $content_id ) {
508	$contents = tutor_utils()->get_course_prev_next_contents_by_id( $content_id );
509	$autoload_course_content = (bool) get_tutor_option( 'autoload_next_course_content' );
510	if ( $autoload_course_content ) {
511	wp_safe_redirect( get_the_permalink( $contents->next_id ) );
512	} else {
513	wp_safe_redirect( get_the_permalink( $content_id ) );
514	}
515	die();
516	}
517
518	/**
519	* Replay lesson comment
520	*
521	* @since 1.0.0
522	*
523	* @return void\|null
524	*/
525	public function reply_lesson_comment() {
526	tutor_utils()->checking_nonce();
527	$comment = Input::post( 'comment', '', Input::TYPE_KSES_POST );
528	if ( 0 === strlen( $comment ) ) {
529	wp_send_json_error();
530	return;
531	}
532
533	$comment_data = array(
534	'comment_content' => $comment,
535	'comment_post_ID' => Input::post( 'comment_post_ID', 0, Input::TYPE_INT ),
536	'comment_parent' => Input::post( 'comment_parent', 0, Input::TYPE_INT ),
537	);
538	$comment_id = self::create_comment( $comment_data );
539	if ( false === $comment_id ) {
540	wp_send_json_error();
541	return;
542	}
543	$reply = get_comment( $comment_id );
544	do_action( 'tutor_reply_lesson_comment_thread', $comment_id, $comment_data );
545
546	ob_start();
547	?>
548	<div class="tutor-comments-list tutor-child-comment tutor-mt-32" id="lesson-comment-<?php echo esc_attr( $reply->comment_ID ); ?>">
549	<div class="comment-avatar">
550	<img src="<?php echo esc_url( get_avatar_url( $reply->user_id ) ); ?>" alt="">
551	</div>
552	<div class="tutor-single-comment">
553	<div class="tutor-actual-comment tutor-mb-12">
554	<div class="tutor-comment-author">
555	<span class="tutor-fs-6 tutor-fw-bold">
556	<?php echo esc_html( $reply->comment_author ); ?>
557	</span>
558	<span class="tutor-fs-7 tutor-ml-0 tutor-ml-sm-10">
559	<?php echo esc_html( human_time_diff( strtotime( $reply->comment_date ), tutor_time() ) . __( ' ago', 'tutor' ) ); ?>
560	</span>
561	</div>
562	<div class="tutor-comment-text tutor-fs-6 tutor-mt-4">
563	<?php echo esc_html( $reply->comment_content ); ?>
564	</div>
565	</div>
566	</div>
567	</div>
568	<?php
569	$html = ob_get_clean();
570	wp_send_json_success( array( 'html' => $html ) );
571	}
572
573	/**
574	* Get comments
575	*
576	* @since 2.0.6
577	* @see Checkout arguments details: https://developer.wordpress.org/reference/classes/wp_comment_query/__construct/
578	*
579	* @param array $args arguments.
580	* @return mixed based on arguments
581	*/
582	public static function get_comments( array $args ) {
583	$args['type'] = 'comment';
584	$comments = get_comments( $args );
585	return $comments;
586	}
587
588	/**
589	* Create comment
590	*
591	* @since 1.0.0
592	*
593	* @param array $request request.
594	* @return mixed comment id on success, false on failure
595	*/
596	public static function create_comment( array $request ) {
597	$current_user = wp_get_current_user();
598	$default_data = array(
599	'comment_content' => '',
600	'comment_post_ID' => '',
601	'comment_parent' => '',
602	'user_id' => $current_user->ID,
603	'comment_author' => $current_user->user_login,
604	'comment_author_email' => $current_user->user_email,
605	'comment_author_url' => $current_user->user_url,
606	'comment_agent' => 'Tutor',
607	);
608	$comment_data = wp_parse_args( $request, $default_data );
609	return wp_insert_comment( $comment_data );
610	}
611
612	/**
613	* Check if lesson has content
614	*
615	* @since 3.9.0
616	*
617	* @param int $lesson_id Lesson ID.
618	*
619	* @return bool True if lesson has content, false otherwise.
620	*/
621	public static function has_lesson_content( $lesson_id ) {
622	/**
623	* If lesson has no content, lesson tab will be hidden.
624	* To enable elementor and SCORM, only admin can see lesson tab.
625	*
626	* @since 2.2.2
627	*/
628	return apply_filters(
629	'tutor_has_lesson_content',
630	User::is_admin() \|\| ! in_array( trim( get_the_content() ), array( null, '', ' ' ), true ),
631	$lesson_id
632	);
633	}
634
635	/**
636	* Check if lesson has attachments
637	*
638	* @since 3.9.0
639	*
640	* @param int $lesson_id Lesson ID.
641	*
642	* @return bool True if lesson has attachments, false otherwise.
643	*/
644	public static function has_lesson_attachment( $lesson_id ) {
645	return count( tutor_utils()->get_attachments( $lesson_id ) ) > 0;
646	}
647
648	/**
649	* Check if comments are enabled for lessons
650	*
651	* @since 3.9.0
652	*
653	* @return bool True if comments are enabled, false otherwise.
654	*/
655	public static function is_comment_enabled() {
656	return tutor_utils()->get_option( 'enable_comment_for_lesson' ) && comments_open() && is_user_logged_in();
657	}
658
659	/**
660	* Check if lesson has comments
661	*
662	* @since 3.9.0
663	*
664	* @param int $lesson_id Lesson ID.
665	*
666	* @return int Number of comments for the lesson.
667	*/
668	public static function has_lesson_comment( $lesson_id ) {
669	return (int) get_comments_number( $lesson_id );
670	}
671
672	/**
673	* Get navigation items for lesson single page
674	*
675	* @since 3.9.0
676	*
677	* @param int $lesson_id Lesson ID.
678	*
679	* @return array navigation items array
680	*/
681	public static function get_nav_items( $lesson_id ) {
682	$nav_items = array();
683
684	if ( self::has_lesson_content( $lesson_id ) ) {
685	$nav_items['overview'] = array(
686	'label' => __( 'Overview', 'tutor' ),
687	'value' => 'overview',
688	'icon' => 'document-text',
689	);
690	}
691
692	if ( self::has_lesson_attachment( $lesson_id ) ) {
693	$nav_items['files'] = array(
694	'label' => __( 'Exercise Files', 'tutor' ),
695	'value' => 'files',
696	'icon' => 'paperclip',
697	);
698	}
699
700	if ( self::is_comment_enabled() ) {
701	$nav_items['comments'] = array(
702	'label' => __( 'Comments', 'tutor' ),
703	'value' => 'comments',
704	'icon' => 'comment',
705	);
706	}
707
708	$nav_items = apply_filters( 'tutor_lesson_single_nav_items', $nav_items );
709	$nav_items = array_values( $nav_items );
710
711	return $nav_items;
712	}
713
714	/**
715	* Get navigation contents for lesson single page
716	*
717	* @since 3.9.0
718	*
719	* @param int $lesson_id Lesson ID.
720	*
721	* @return array navigation contents array
722	*/
723	public static function get_nav_contents( $lesson_id ) {
724	$nav_contents = array();
725
726	if ( self::has_lesson_content( $lesson_id ) ) {
727	$nav_contents['overview'] = array(
728	'label' => __( 'Overview', 'tutor' ),
729	'value' => 'overview',
730	'template_path' => 'single.lesson.parts.overview',
731	);
732	}
733
734	if ( self::has_lesson_attachment( $lesson_id ) ) {
735	$nav_contents['files'] = array(
736	'label' => __( 'Files', 'tutor' ),
737	'value' => 'files',
738	'template_path' => 'single.lesson.parts.files',
739	);
740	}
741
742	if ( self::is_comment_enabled() ) {
743	$nav_contents['comments'] = array(
744	'label' => __( 'Comments', 'tutor' ),
745	'value' => 'comments',
746	'template_path' => 'single.lesson.parts.comments',
747	);
748	}
749
750	$nav_contents = apply_filters( 'tutor_lesson_single_nav_contents', $nav_contents );
751
752	return $nav_contents;
753	}
754	}
755