jetpack / jetpack_vendor / automattic / jetpack-videopress / src / class-caption-tracks.php

class-caption-tracks.php in Jetpack – WP Security, Backup, Speed, & Growth 16.3-beta, at jetpack_vendor/automattic/jetpack-videopress/src/class-caption-tracks.php

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1	<?php
2	/**
3	* VideoPress caption track post type and helpers.
4	*
5	* @package automattic/jetpack-videopress
6	*/
7
8	namespace Automattic\Jetpack\VideoPress;
9
10	/**
11	* Stores editable caption track documents as private WordPress posts.
12	*
13	* Track content is stored as serialized `videopress/caption-cue` block markup,
14	* matching the block-based editor that produces it. This is a deliberate
15	* trade-off: it keeps the draft round-trippable through the editor without a
16	* bespoke format, at the cost of coupling stored drafts to the block markup
17	* (sanitization re-parses blocks, and replacing the editor later means
18	* migrating stored content).
19	*
20	* The REST routes serving this store live in
21	* {@see WPCOM_REST_API_V2_Endpoint_VideoPress_Caption_Tracks}.
22	*/
23	class Caption_Tracks {
24
25	const POST_TYPE = 'vp_caption_track';
26
27	const CUE_BLOCK_NAME = 'videopress/caption-cue';
28
29	const META_GUID = '_videopress_guid';
30	const META_KIND = '_videopress_caption_kind';
31	const META_SRC_LANG = '_videopress_caption_src_lang';
32	const META_LABEL = '_videopress_caption_label';
33	const META_SOURCE_TRACK_KIND = '_videopress_source_track_kind';
34	const META_SOURCE_TRACK_SRC_LANG = '_videopress_source_track_src_lang';
35	const META_SOURCE_TRACK_SRC = '_videopress_source_track_src';
36
37	/**
38	* Initialize the caption track post type.
39	*
40	* @return void
41	*/
42	public static function init() {
43	add_action( 'init', array( __CLASS__, 'register_post_type' ) );
44	add_action( 'init', array( __CLASS__, 'register_meta' ) );
45	}
46
47	/**
48	* Register the private caption track post type.
49	*
50	* @return void
51	*/
52	public static function register_post_type() {
53	register_post_type(
54	self::POST_TYPE,
55	array(
56	'labels' => array(
57	'name' => __( 'VideoPress caption tracks', 'jetpack-videopress-pkg' ),
58	'singular_name' => __( 'VideoPress caption track', 'jetpack-videopress-pkg' ),
59	),
60	'public' => false,
61	'exclude_from_search' => true,
62	'publicly_queryable' => false,
63	'show_ui' => false,
64	'show_in_menu' => false,
65	'show_in_rest' => false,
66	// No revisions: there is no restore UI, and each one would copy up to 1MB of content.
67	'supports' => array( 'title', 'editor' ),
68
69	/*
70	* Caption tracks are an internal store reached only through the
71	* /wpcom/v2/videopress/caption-tracks routes, which authorize
72	* each request against the video it targets. The post type itself
73	* is not exposed (no REST, no admin UI), so standard post
74	* capabilities are sufficient.
75	*/
76	'capability_type' => 'post',
77	'map_meta_cap' => true,
78	)
79	);
80	}
81
82	/**
83	* Register caption track metadata so values are sanitized when saved.
84	*
85	* @return void
86	*/
87	public static function register_meta() {
88	$string_meta = array(
89	self::META_GUID => array( __CLASS__, 'sanitize_guid' ),
90	self::META_KIND => array( __CLASS__, 'sanitize_kind' ),
91	self::META_SRC_LANG => array( __CLASS__, 'sanitize_manual_language' ),
92	self::META_LABEL => 'sanitize_text_field',
93	self::META_SOURCE_TRACK_KIND => array( __CLASS__, 'sanitize_kind' ),
94	self::META_SOURCE_TRACK_SRC_LANG => 'sanitize_text_field',
95	self::META_SOURCE_TRACK_SRC => 'esc_url_raw',
96	);
97
98	foreach ( $string_meta as $key => $sanitize_callback ) {
99	register_post_meta(
100	self::POST_TYPE,
101	$key,
102	array(
103	'type' => 'string',
104	'single' => true,
105	'sanitize_callback' => $sanitize_callback,
106	)
107	);
108	}
109	}
110
111	/**
112	* Sanitize a VideoPress GUID.
113	*
114	* @param string $value Raw value.
115	* @return string
116	*/
117	public static function sanitize_guid( $value ) {
118	$value = sanitize_text_field( $value );
119	return preg_match( '/^[a-z0-9]{8}$/i', $value ) ? $value : '';
120	}
121
122	/**
123	* Sanitize a text track kind.
124	*
125	* @param string $value Raw value.
126	* @return string
127	*/
128	public static function sanitize_kind( $value ) {
129	$value = sanitize_key( $value );
130	$valid = array( 'subtitles', 'captions', 'descriptions', 'chapters', 'metadata' );
131	return in_array( $value, $valid, true ) ? $value : '';
132	}
133
134	/**
135	* Validate a caption track's BCP-47 language tag.
136	*
137	* The client canonicalizes tags with `Intl.getCanonicalLocales` before
138	* saving, and the "one track per language" lookup matches stored tags by
139	* exact string, so this is a validation gate only: it rejects generated
140	* source keys such as `auto_en` and malformed tags, then keeps the client's
141	* canonical value verbatim. Re-casing here would risk diverging from the
142	* client's canonical form and silently create duplicate tracks.
143	*
144	* @param string $value Raw value.
145	* @return string Validated tag, or empty string when invalid.
146	*/
147	public static function sanitize_manual_language( $value ) {
148	$value = trim( sanitize_text_field( $value ) );
149
150	if ( preg_match( '/^auto[_-]/i', $value ) ) {
151	return '';
152	}
153
154	if ( ! preg_match( '/^[a-z]{2,3}(?:-[a-z0-9]{2,8})*$/i', $value ) ) {
155	return '';
156	}
157
158	return $value;
159	}
160	}
161