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| 1 | <?php |
| 2 | /** |
| 3 | * Site-wide index of the Video Playlist blocks in published content. |
| 4 | * |
| 5 | * @package automattic/jetpack-videopress |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\VideoPress; |
| 9 | |
| 10 | use WP_Post; |
| 11 | use WP_Query; |
| 12 | |
| 13 | /** |
| 14 | * Keeps the `videopress_playlist_index` option in sync with the Video Playlist |
| 15 | * blocks found in published content, so the All Playlists block can list them |
| 16 | * without scanning the site on every render. |
| 17 | * |
| 18 | * The option is an object keyed by playlist key; every record holds the |
| 19 | * playlist title, description, videos, and the id of the post it lives in. |
| 20 | */ |
| 21 | class Playlist_Index { |
| 22 | |
| 23 | /** |
| 24 | * Option holding the index. Never autoloaded: it grows with the site. |
| 25 | * |
| 26 | * @var string |
| 27 | */ |
| 28 | const OPTION_NAME = 'videopress_playlist_index'; |
| 29 | |
| 30 | /** |
| 31 | * Option recording which index schema the site has been fully scanned for. |
| 32 | * Bump INDEX_VERSION to have every site rescanned on its next update. |
| 33 | * |
| 34 | * @var string |
| 35 | */ |
| 36 | const VERSION_OPTION_NAME = 'videopress_playlist_index_version'; |
| 37 | |
| 38 | /** |
| 39 | * Current index schema version. |
| 40 | * |
| 41 | * @var int |
| 42 | */ |
| 43 | const INDEX_VERSION = 1; |
| 44 | |
| 45 | /** |
| 46 | * Cron hook that runs the initial full scan. |
| 47 | * |
| 48 | * @var string |
| 49 | */ |
| 50 | const BUILD_HOOK = 'videopress_build_playlist_index'; |
| 51 | |
| 52 | /** |
| 53 | * Name of the block the index tracks. |
| 54 | * |
| 55 | * @var string |
| 56 | */ |
| 57 | const BLOCK_NAME = 'videopress/playlist'; |
| 58 | |
| 59 | /** |
| 60 | * Blocks that build a playlist dynamically and wrap a Video Playlist block |
| 61 | * as their canvas. They are not playlists of their own, so the scan skips |
| 62 | * them and everything inside them. |
| 63 | * |
| 64 | * @var string[] |
| 65 | */ |
| 66 | const DYNAMIC_PLAYLIST_BLOCKS = array( 'videopress/latest-videos-playlist' ); |
| 67 | |
| 68 | /** |
| 69 | * Posts fetched per query during a full scan. |
| 70 | * |
| 71 | * @var int |
| 72 | */ |
| 73 | const SCAN_BATCH_SIZE = 100; |
| 74 | |
| 75 | /** |
| 76 | * Hook the index into the post lifecycle and schedule the initial scan. |
| 77 | * |
| 78 | * @return void |
| 79 | */ |
| 80 | public static function init() { |
| 81 | add_action( 'wp_after_insert_post', array( __CLASS__, 'index_post' ), 10, 2 ); |
| 82 | add_action( 'deleted_post', array( __CLASS__, 'remove_post' ) ); |
| 83 | add_action( 'admin_init', array( __CLASS__, 'maybe_schedule_build' ) ); |
| 84 | add_action( self::BUILD_HOOK, array( __CLASS__, 'build' ) ); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Get every indexed playlist, keyed by playlist key. |
| 89 | * |
| 90 | * @return array<string, array{title: string, description: string, videos: array, post_id: int}> |
| 91 | */ |
| 92 | public static function get_playlists() { |
| 93 | $index = get_option( self::OPTION_NAME, array() ); |
| 94 | |
| 95 | return is_array( $index ) ? $index : array(); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Schedule the one-off full scan when the site has never been indexed for the |
| 100 | * current schema, e.g. right after the plugin update that shipped the index. |
| 101 | * |
| 102 | * @return void |
| 103 | */ |
| 104 | public static function maybe_schedule_build() { |
| 105 | if ( (int) get_option( self::VERSION_OPTION_NAME, 0 ) >= self::INDEX_VERSION ) { |
| 106 | return; |
| 107 | } |
| 108 | |
| 109 | if ( ! wp_next_scheduled( self::BUILD_HOOK ) ) { |
| 110 | wp_schedule_single_event( time(), self::BUILD_HOOK ); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Rebuild the whole index from the published content that contains a |
| 116 | * Video Playlist block, then record the schema version it was built for. |
| 117 | * |
| 118 | * @return void |
| 119 | */ |
| 120 | public static function build() { |
| 121 | $index = array(); |
| 122 | $paged = 1; |
| 123 | |
| 124 | $add_content_clause = function ( $where ) { |
| 125 | global $wpdb; |
| 126 | |
| 127 | return $where . $wpdb->prepare( |
| 128 | " AND {$wpdb->posts}.post_content LIKE %s", |
| 129 | '%' . $wpdb->esc_like( '<!-- wp:' . self::BLOCK_NAME ) . '%' |
| 130 | ); |
| 131 | }; |
| 132 | |
| 133 | add_filter( 'posts_where', $add_content_clause ); |
| 134 | |
| 135 | do { |
| 136 | $query = new WP_Query( |
| 137 | array( |
| 138 | 'post_type' => self::indexed_post_types(), |
| 139 | 'post_status' => 'publish', |
| 140 | 'posts_per_page' => self::SCAN_BATCH_SIZE, |
| 141 | 'paged' => $paged, |
| 142 | 'orderby' => 'ID', |
| 143 | 'order' => 'ASC', |
| 144 | 'no_found_rows' => true, |
| 145 | 'ignore_sticky_posts' => true, |
| 146 | 'update_post_meta_cache' => false, |
| 147 | 'update_post_term_cache' => false, |
| 148 | ) |
| 149 | ); |
| 150 | |
| 151 | foreach ( $query->posts as $post ) { |
| 152 | if ( $post instanceof WP_Post ) { |
| 153 | self::add_post_records( $index, $post ); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | $batch_size = count( $query->posts ); |
| 158 | ++$paged; |
| 159 | } while ( self::SCAN_BATCH_SIZE === $batch_size ); |
| 160 | |
| 161 | remove_filter( 'posts_where', $add_content_clause ); |
| 162 | |
| 163 | self::save( $index ); |
| 164 | update_option( self::VERSION_OPTION_NAME, self::INDEX_VERSION ); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Re-index one post after it is saved: its previous records are replaced by |
| 169 | * the playlists its content holds now, or dropped when it is no longer public. |
| 170 | * |
| 171 | * @param int $post_id Post id. |
| 172 | * @param WP_Post|null $post The post; looked up when omitted. |
| 173 | * |
| 174 | * @return void |
| 175 | */ |
| 176 | public static function index_post( $post_id, $post = null ) { |
| 177 | $post_id = absint( $post_id ); |
| 178 | if ( ! $post_id || wp_is_post_revision( $post_id ) || wp_is_post_autosave( $post_id ) ) { |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | if ( ! $post instanceof WP_Post ) { |
| 183 | $post = get_post( $post_id ); |
| 184 | } |
| 185 | if ( ! $post instanceof WP_Post ) { |
| 186 | return; |
| 187 | } |
| 188 | |
| 189 | $index = self::without_post( self::get_playlists(), $post_id ); |
| 190 | |
| 191 | if ( 'publish' === $post->post_status && in_array( $post->post_type, self::indexed_post_types(), true ) ) { |
| 192 | self::add_post_records( $index, $post ); |
| 193 | } |
| 194 | |
| 195 | self::save( $index ); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Drop a deleted post's playlists from the index. |
| 200 | * |
| 201 | * @param int $post_id Post id. |
| 202 | * |
| 203 | * @return void |
| 204 | */ |
| 205 | public static function remove_post( $post_id ) { |
| 206 | $post_id = absint( $post_id ); |
| 207 | if ( ! $post_id ) { |
| 208 | return; |
| 209 | } |
| 210 | |
| 211 | self::save( self::without_post( self::get_playlists(), $post_id ) ); |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Extract the playlist records from a post's content. |
| 216 | * |
| 217 | * Keys come from the block's `playlistId` attribute. Blocks saved before the |
| 218 | * attribute existed fall back to `{post id}-{ordinal}`, and a key another |
| 219 | * post already owns (a block copied between posts) is suffixed with the post |
| 220 | * id so both playlists stay listed. |
| 221 | * |
| 222 | * @param WP_Post $post The post. |
| 223 | * |
| 224 | * @return array<string, array> Records keyed by playlist key. |
| 225 | */ |
| 226 | public static function extract_records( WP_Post $post ) { |
| 227 | $records = array(); |
| 228 | if ( ! has_block( self::BLOCK_NAME, $post ) ) { |
| 229 | return $records; |
| 230 | } |
| 231 | |
| 232 | $ordinal = 0; |
| 233 | foreach ( self::find_playlist_blocks( parse_blocks( $post->post_content ) ) as $attrs ) { |
| 234 | ++$ordinal; |
| 235 | |
| 236 | $key = isset( $attrs['playlistId'] ) && is_string( $attrs['playlistId'] ) |
| 237 | ? sanitize_key( $attrs['playlistId'] ) |
| 238 | : ''; |
| 239 | if ( '' === $key ) { |
| 240 | $key = $post->ID . '-' . $ordinal; |
| 241 | } |
| 242 | |
| 243 | $records[ $key ] = array( |
| 244 | 'title' => isset( $attrs['playlistTitle'] ) && is_string( $attrs['playlistTitle'] ) |
| 245 | ? sanitize_text_field( $attrs['playlistTitle'] ) |
| 246 | : '', |
| 247 | 'description' => isset( $attrs['playlistDescription'] ) && is_string( $attrs['playlistDescription'] ) |
| 248 | ? sanitize_textarea_field( $attrs['playlistDescription'] ) |
| 249 | : '', |
| 250 | 'videos' => Initializer::sanitize_playlist_entries( $attrs['videos'] ?? null ), |
| 251 | 'post_id' => (int) $post->ID, |
| 252 | ); |
| 253 | } |
| 254 | |
| 255 | return $records; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * Merge a post's playlist records into an index being built. |
| 260 | * |
| 261 | * @param array $index The index, modified in place. |
| 262 | * @param WP_Post $post The post. |
| 263 | * |
| 264 | * @return void |
| 265 | */ |
| 266 | private static function add_post_records( array &$index, WP_Post $post ) { |
| 267 | foreach ( self::extract_records( $post ) as $key => $record ) { |
| 268 | if ( isset( $index[ $key ] ) && (int) $index[ $key ]['post_id'] !== (int) $post->ID ) { |
| 269 | $key .= '-' . $post->ID; |
| 270 | } |
| 271 | $index[ $key ] = $record; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Collect the attributes of every standalone Video Playlist block in a parsed |
| 277 | * block tree; dynamic playlist blocks and their inner blocks are skipped. |
| 278 | * |
| 279 | * @param array $blocks Parsed blocks. |
| 280 | * |
| 281 | * @return array[] Attribute arrays, in document order. |
| 282 | */ |
| 283 | private static function find_playlist_blocks( array $blocks ) { |
| 284 | $found = array(); |
| 285 | |
| 286 | foreach ( $blocks as $block ) { |
| 287 | if ( in_array( $block['blockName'] ?? null, self::DYNAMIC_PLAYLIST_BLOCKS, true ) ) { |
| 288 | continue; |
| 289 | } |
| 290 | |
| 291 | if ( self::BLOCK_NAME === ( $block['blockName'] ?? null ) ) { |
| 292 | $found[] = isset( $block['attrs'] ) && is_array( $block['attrs'] ) ? $block['attrs'] : array(); |
| 293 | } |
| 294 | |
| 295 | if ( ! empty( $block['innerBlocks'] ) && is_array( $block['innerBlocks'] ) ) { |
| 296 | $found = array_merge( $found, self::find_playlist_blocks( $block['innerBlocks'] ) ); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | return $found; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Return the index without the records that belong to a post. |
| 305 | * |
| 306 | * @param array $index The index. |
| 307 | * @param int $post_id Post id. |
| 308 | * |
| 309 | * @return array |
| 310 | */ |
| 311 | private static function without_post( array $index, $post_id ) { |
| 312 | return array_filter( |
| 313 | $index, |
| 314 | function ( $record ) use ( $post_id ) { |
| 315 | return ! is_array( $record ) || (int) ( $record['post_id'] ?? 0 ) !== (int) $post_id; |
| 316 | } |
| 317 | ); |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * Post types whose content the index covers: everything a visitor can open. |
| 322 | * |
| 323 | * @return string[] |
| 324 | */ |
| 325 | private static function indexed_post_types() { |
| 326 | return array_values( |
| 327 | array_filter( |
| 328 | get_post_types( array( 'public' => true ) ), |
| 329 | function ( $post_type ) { |
| 330 | return 'attachment' !== $post_type; |
| 331 | } |
| 332 | ) |
| 333 | ); |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Persist the index, without autoloading it. |
| 338 | * |
| 339 | * @param array $index The index. |
| 340 | * |
| 341 | * @return void |
| 342 | */ |
| 343 | private static function save( array $index ) { |
| 344 | if ( false === get_option( self::OPTION_NAME ) ) { |
| 345 | add_option( self::OPTION_NAME, $index, '', false ); |
| 346 | return; |
| 347 | } |
| 348 | |
| 349 | update_option( self::OPTION_NAME, $index, false ); |
| 350 | } |
| 351 | } |