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| 1 | <?php |
| 2 | /** |
| 3 | * REST API endpoint for managing VideoPress caption tracks. |
| 4 | * |
| 5 | * @package automattic/jetpack-videopress |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\VideoPress; |
| 9 | |
| 10 | if ( ! defined( 'ABSPATH' ) ) { |
| 11 | exit( 0 ); |
| 12 | } |
| 13 | |
| 14 | /** |
| 15 | * VideoPress caption tracks wpcom api v2 endpoint. Registered under `wpcom/v2` |
| 16 | * (rather than `jetpack/v4`) so the same routes serve WordPress.com Simple |
| 17 | * sites, which don't load the Jetpack namespace. |
| 18 | * |
| 19 | * @phan-constructor-used-for-side-effects |
| 20 | */ |
| 21 | class WPCOM_REST_API_V2_Endpoint_VideoPress_Caption_Tracks extends \WP_REST_Controller { |
| 22 | |
| 23 | /** |
| 24 | * Upper bound on caption-cue blocks accepted in a single save. |
| 25 | * |
| 26 | * @var int |
| 27 | */ |
| 28 | const MAX_CUE_BLOCKS = 5000; |
| 29 | |
| 30 | /** |
| 31 | * Upper bound, in bytes, on submitted caption track content. |
| 32 | * |
| 33 | * @var int |
| 34 | */ |
| 35 | const MAX_CONTENT_BYTES = 1048576; |
| 36 | |
| 37 | /** |
| 38 | * Upper bound on tracks returned when listing a video's caption tracks. |
| 39 | * |
| 40 | * @var int |
| 41 | */ |
| 42 | const TRACK_LIST_LIMIT = 500; |
| 43 | |
| 44 | /** |
| 45 | * The namespace of this controller's route. |
| 46 | * |
| 47 | * @var string |
| 48 | */ |
| 49 | protected $namespace = 'wpcom/v2'; |
| 50 | |
| 51 | /** |
| 52 | * The base of this controller's route. |
| 53 | * |
| 54 | * @var string |
| 55 | */ |
| 56 | protected $rest_base = 'videopress/caption-tracks'; |
| 57 | |
| 58 | /** |
| 59 | * Metadata keys exposed in the REST payload. |
| 60 | * |
| 61 | * @var string[] |
| 62 | */ |
| 63 | private static $meta_keys = array( |
| 64 | Caption_Tracks::META_GUID, |
| 65 | Caption_Tracks::META_KIND, |
| 66 | Caption_Tracks::META_SRC_LANG, |
| 67 | Caption_Tracks::META_LABEL, |
| 68 | Caption_Tracks::META_SOURCE_TRACK_KIND, |
| 69 | Caption_Tracks::META_SOURCE_TRACK_SRC_LANG, |
| 70 | Caption_Tracks::META_SOURCE_TRACK_SRC, |
| 71 | ); |
| 72 | |
| 73 | /** |
| 74 | * Constructor. |
| 75 | */ |
| 76 | public function __construct() { |
| 77 | add_action( 'rest_api_init', array( $this, 'register_routes' ) ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Register the routes. |
| 82 | */ |
| 83 | public function register_routes() { |
| 84 | register_rest_route( |
| 85 | $this->namespace, |
| 86 | '/' . $this->rest_base, |
| 87 | array( |
| 88 | array( |
| 89 | 'methods' => \WP_REST_Server::READABLE, |
| 90 | 'callback' => array( __CLASS__, 'rest_list_tracks' ), |
| 91 | 'permission_callback' => array( __CLASS__, 'rest_permission_check' ), |
| 92 | 'args' => array( |
| 93 | 'guid' => array( |
| 94 | 'description' => __( 'VideoPress GUID.', 'jetpack-videopress-pkg' ), |
| 95 | 'type' => 'string', |
| 96 | 'required' => true, |
| 97 | ), |
| 98 | ), |
| 99 | ), |
| 100 | array( |
| 101 | 'methods' => \WP_REST_Server::CREATABLE, |
| 102 | 'callback' => array( __CLASS__, 'rest_save_track' ), |
| 103 | 'permission_callback' => array( __CLASS__, 'rest_permission_check' ), |
| 104 | 'args' => $this->save_track_args(), |
| 105 | ), |
| 106 | ) |
| 107 | ); |
| 108 | |
| 109 | register_rest_route( |
| 110 | $this->namespace, |
| 111 | '/' . $this->rest_base . '/(?P<id>\d+)', |
| 112 | array( |
| 113 | array( |
| 114 | // @phan-suppress-next-line PhanPluginMixedKeyNoKey -- register_rest_route() supports a shared `args` key alongside endpoint arrays. |
| 115 | 'methods' => \WP_REST_Server::EDITABLE, |
| 116 | 'callback' => array( __CLASS__, 'rest_save_track' ), |
| 117 | 'permission_callback' => array( __CLASS__, 'rest_permission_check' ), |
| 118 | 'args' => $this->save_track_args(), |
| 119 | ), |
| 120 | array( |
| 121 | 'methods' => \WP_REST_Server::DELETABLE, |
| 122 | 'callback' => array( __CLASS__, 'rest_delete_track' ), |
| 123 | 'permission_callback' => array( __CLASS__, 'rest_permission_check' ), |
| 124 | ), |
| 125 | 'args' => array( |
| 126 | 'id' => array( |
| 127 | 'description' => __( 'Caption track ID.', 'jetpack-videopress-pkg' ), |
| 128 | 'type' => 'integer', |
| 129 | 'required' => true, |
| 130 | ), |
| 131 | ), |
| 132 | ) |
| 133 | ); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Request schema for the caption track create/update routes. |
| 138 | * |
| 139 | * Type and shape validation only; the save handler still owns the semantic |
| 140 | * checks (GUID format, language tag, kind) so it can return specific errors. |
| 141 | * |
| 142 | * @return array |
| 143 | */ |
| 144 | private function save_track_args() { |
| 145 | $meta_properties = array(); |
| 146 | foreach ( self::$meta_keys as $key ) { |
| 147 | $meta_properties[ $key ] = array( 'type' => 'string' ); |
| 148 | } |
| 149 | |
| 150 | return array( |
| 151 | 'guid' => array( |
| 152 | 'description' => __( 'VideoPress GUID.', 'jetpack-videopress-pkg' ), |
| 153 | 'type' => 'string', |
| 154 | ), |
| 155 | 'title' => array( |
| 156 | 'description' => __( 'Caption track title.', 'jetpack-videopress-pkg' ), |
| 157 | 'type' => 'string', |
| 158 | ), |
| 159 | 'content' => array( |
| 160 | 'description' => __( 'Serialized caption-cue block content.', 'jetpack-videopress-pkg' ), |
| 161 | 'type' => 'string', |
| 162 | ), |
| 163 | 'status' => array( |
| 164 | 'description' => __( 'Caption track status.', 'jetpack-videopress-pkg' ), |
| 165 | 'type' => 'string', |
| 166 | 'enum' => array( 'draft', 'publish' ), |
| 167 | ), |
| 168 | 'meta' => array( |
| 169 | 'description' => __( 'Caption track metadata.', 'jetpack-videopress-pkg' ), |
| 170 | 'type' => 'object', |
| 171 | 'required' => true, |
| 172 | 'properties' => $meta_properties, |
| 173 | 'additionalProperties' => false, |
| 174 | ), |
| 175 | ); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * The caption-track ID from the request's URL path, if any. |
| 180 | * |
| 181 | * Only the `(?P<id>\d+)` item routes supply one. Reading it from the URL |
| 182 | * params rather than `get_param()` — which also exposes query-string and body |
| 183 | * values regardless of a route's declared args — stops a spoofed `?id=` on the |
| 184 | * list/create routes from re-targeting the request at another video's track. |
| 185 | * |
| 186 | * @param \WP_REST_Request $request Incoming request. |
| 187 | * @return int Track ID, or 0 when the route path has none. |
| 188 | */ |
| 189 | private static function url_track_id( \WP_REST_Request $request ) { |
| 190 | $url_params = $request->get_url_params(); |
| 191 | return isset( $url_params['id'] ) ? (int) $url_params['id'] : 0; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * REST permission callback for the caption track routes. |
| 196 | * |
| 197 | * Authorizes against the video the request targets: an existing track is |
| 198 | * authorized against the video it already belongs to, while a new track is |
| 199 | * authorized against the GUID supplied in the request. |
| 200 | * |
| 201 | * @param \WP_REST_Request $request Incoming request. |
| 202 | * @return bool |
| 203 | */ |
| 204 | public static function rest_permission_check( \WP_REST_Request $request ) { |
| 205 | $track_id = self::url_track_id( $request ); |
| 206 | if ( $track_id ) { |
| 207 | $existing = get_post( $track_id ); |
| 208 | if ( $existing instanceof \WP_Post && Caption_Tracks::POST_TYPE === $existing->post_type ) { |
| 209 | /* |
| 210 | * An existing track stays pinned to the video it already belongs |
| 211 | * to; the request body can never re-target it. A track whose |
| 212 | * stored GUID is empty is malformed and cannot be authorized, so |
| 213 | * `current_user_can_edit_video` denies it rather than falling back |
| 214 | * to the (attacker-controlled) body GUID. |
| 215 | */ |
| 216 | return self::current_user_can_edit_video( |
| 217 | (string) get_post_meta( $track_id, Caption_Tracks::META_GUID, true ) |
| 218 | ); |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | $meta = (array) $request->get_param( 'meta' ); |
| 223 | $guid = isset( $meta[ Caption_Tracks::META_GUID ] ) ? (string) $meta[ Caption_Tracks::META_GUID ] : (string) $request->get_param( 'guid' ); |
| 224 | |
| 225 | return self::current_user_can_edit_video( $guid ); |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * List caption tracks for a VideoPress GUID. |
| 230 | * |
| 231 | * Responses include each track's full content so the editor can open a |
| 232 | * draft without a second fetch, so payload size scales with the number of |
| 233 | * languages times their content size (capped per track by MAX_CONTENT_BYTES). |
| 234 | * |
| 235 | * @param \WP_REST_Request $request Incoming request. |
| 236 | * @return \WP_REST_Response|\WP_Error |
| 237 | */ |
| 238 | public static function rest_list_tracks( \WP_REST_Request $request ) { |
| 239 | $guid = Caption_Tracks::sanitize_guid( $request->get_param( 'guid' ) ); |
| 240 | if ( empty( $guid ) ) { |
| 241 | return new \WP_Error( |
| 242 | 'videopress_caption_track_invalid_guid', |
| 243 | esc_html__( 'A valid VideoPress GUID is required.', 'jetpack-videopress-pkg' ), |
| 244 | array( 'status' => 400 ) |
| 245 | ); |
| 246 | } |
| 247 | |
| 248 | $query = new \WP_Query( |
| 249 | array( |
| 250 | 'post_type' => Caption_Tracks::POST_TYPE, |
| 251 | 'post_status' => 'any', |
| 252 | // Safety cap against unbounded queries, not pagination; no video should approach this many tracks. |
| 253 | 'posts_per_page' => self::TRACK_LIST_LIMIT, |
| 254 | 'orderby' => 'modified', |
| 255 | 'order' => 'DESC', |
| 256 | 'meta_key' => Caption_Tracks::META_GUID, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key |
| 257 | 'meta_value' => $guid, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value |
| 258 | 'no_found_rows' => true, |
| 259 | 'update_post_term_cache' => false, |
| 260 | ) |
| 261 | ); |
| 262 | |
| 263 | $tracks = array_map( array( __CLASS__, 'prepare_track_response' ), $query->posts ); |
| 264 | return rest_ensure_response( $tracks ); |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Create or update a caption track. |
| 269 | * |
| 270 | * @param \WP_REST_Request $request Incoming request. |
| 271 | * @return \WP_REST_Response|\WP_Error |
| 272 | */ |
| 273 | public static function rest_save_track( \WP_REST_Request $request ) { |
| 274 | $track_id = self::url_track_id( $request ); |
| 275 | $existing = $track_id ? get_post( $track_id ) : null; |
| 276 | |
| 277 | if ( $track_id && ( ! $existing || Caption_Tracks::POST_TYPE !== $existing->post_type ) ) { |
| 278 | return new \WP_Error( |
| 279 | 'videopress_caption_track_not_found', |
| 280 | esc_html__( 'Caption track not found.', 'jetpack-videopress-pkg' ), |
| 281 | array( 'status' => 404 ) |
| 282 | ); |
| 283 | } |
| 284 | |
| 285 | $meta = (array) $request->get_param( 'meta' ); |
| 286 | |
| 287 | $existing_guid = $existing ? (string) get_post_meta( $track_id, Caption_Tracks::META_GUID, true ) : ''; |
| 288 | $guid = Caption_Tracks::sanitize_guid( |
| 289 | '' !== $existing_guid ? $existing_guid : ( $meta[ Caption_Tracks::META_GUID ] ?? $request->get_param( 'guid' ) ) |
| 290 | ); |
| 291 | |
| 292 | if ( empty( $guid ) ) { |
| 293 | return new \WP_Error( |
| 294 | 'videopress_caption_track_invalid_guid', |
| 295 | esc_html__( 'A valid VideoPress GUID is required.', 'jetpack-videopress-pkg' ), |
| 296 | array( 'status' => 400 ) |
| 297 | ); |
| 298 | } |
| 299 | |
| 300 | $src_lang = Caption_Tracks::sanitize_manual_language( $meta[ Caption_Tracks::META_SRC_LANG ] ?? '' ); |
| 301 | if ( empty( $src_lang ) ) { |
| 302 | return new \WP_Error( |
| 303 | 'videopress_caption_track_invalid_language', |
| 304 | esc_html__( 'A valid BCP-47 language tag is required.', 'jetpack-videopress-pkg' ), |
| 305 | array( 'status' => 400 ) |
| 306 | ); |
| 307 | } |
| 308 | |
| 309 | $kind = Caption_Tracks::sanitize_kind( $meta[ Caption_Tracks::META_KIND ] ?? '' ); |
| 310 | if ( empty( $kind ) ) { |
| 311 | return new \WP_Error( |
| 312 | 'videopress_caption_track_invalid_kind', |
| 313 | esc_html__( 'A valid caption track kind is required.', 'jetpack-videopress-pkg' ), |
| 314 | array( 'status' => 400 ) |
| 315 | ); |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Preserve an existing track's status when the request omits `status` |
| 320 | * (e.g. a label-only edit): treating a missing value as `draft` would |
| 321 | * silently unpublish a published caption track. |
| 322 | */ |
| 323 | $requested_status = $request->get_param( 'status' ); |
| 324 | if ( in_array( $requested_status, array( 'publish', 'draft' ), true ) ) { |
| 325 | $post_status = $requested_status; |
| 326 | } else { |
| 327 | $post_status = $existing ? $existing->post_status : 'draft'; |
| 328 | } |
| 329 | |
| 330 | $post_content = self::sanitize_track_content( $request->get_param( 'content' ) ); |
| 331 | if ( is_wp_error( $post_content ) ) { |
| 332 | return $post_content; |
| 333 | } |
| 334 | |
| 335 | $postarr = array( |
| 336 | 'post_type' => Caption_Tracks::POST_TYPE, |
| 337 | 'post_title' => sanitize_text_field( $request->get_param( 'title' ) ), |
| 338 | 'post_content' => $post_content, |
| 339 | 'post_status' => $post_status, |
| 340 | ); |
| 341 | |
| 342 | if ( $track_id ) { |
| 343 | $postarr['ID'] = $track_id; |
| 344 | $result = wp_update_post( wp_slash( $postarr ), true ); |
| 345 | } else { |
| 346 | $result = wp_insert_post( wp_slash( $postarr ), true ); |
| 347 | } |
| 348 | |
| 349 | if ( is_wp_error( $result ) ) { |
| 350 | return $result; |
| 351 | } |
| 352 | |
| 353 | $post_id = (int) $result; |
| 354 | $meta[ Caption_Tracks::META_GUID ] = $guid; |
| 355 | $meta[ Caption_Tracks::META_SRC_LANG ] = $src_lang; |
| 356 | $meta[ Caption_Tracks::META_KIND ] = $kind; |
| 357 | |
| 358 | /* |
| 359 | * REST params arrive unslashed while the metadata layer unslashes on |
| 360 | * write, so slash the values to keep literal backslashes intact. |
| 361 | */ |
| 362 | foreach ( self::$meta_keys as $key ) { |
| 363 | if ( array_key_exists( $key, $meta ) ) { |
| 364 | update_post_meta( $post_id, $key, wp_slash( $meta[ $key ] ) ); |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | return rest_ensure_response( self::prepare_track_response( get_post( $post_id ) ) ); |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * Delete a caption track. |
| 373 | * |
| 374 | * @param \WP_REST_Request $request Incoming request. |
| 375 | * @return \WP_REST_Response|\WP_Error |
| 376 | */ |
| 377 | public static function rest_delete_track( \WP_REST_Request $request ) { |
| 378 | $track_id = self::url_track_id( $request ); |
| 379 | $existing = $track_id ? get_post( $track_id ) : null; |
| 380 | |
| 381 | if ( ! $existing || Caption_Tracks::POST_TYPE !== $existing->post_type ) { |
| 382 | return new \WP_Error( |
| 383 | 'videopress_caption_track_not_found', |
| 384 | esc_html__( 'Caption track not found.', 'jetpack-videopress-pkg' ), |
| 385 | array( 'status' => 404 ) |
| 386 | ); |
| 387 | } |
| 388 | |
| 389 | if ( ! wp_delete_post( $track_id, true ) ) { |
| 390 | return new \WP_Error( |
| 391 | 'videopress_caption_track_delete_failed', |
| 392 | esc_html__( 'Unable to delete the caption track.', 'jetpack-videopress-pkg' ), |
| 393 | array( 'status' => 500 ) |
| 394 | ); |
| 395 | } |
| 396 | |
| 397 | return rest_ensure_response( |
| 398 | array( |
| 399 | 'deleted' => true, |
| 400 | 'id' => $track_id, |
| 401 | ) |
| 402 | ); |
| 403 | } |
| 404 | |
| 405 | /** |
| 406 | * Prepare a caption track REST response. |
| 407 | * |
| 408 | * @param \WP_Post $post Caption track post. |
| 409 | * @return array |
| 410 | */ |
| 411 | public static function prepare_track_response( \WP_Post $post ) { |
| 412 | $meta = array(); |
| 413 | foreach ( self::$meta_keys as $key ) { |
| 414 | $meta[ $key ] = (string) get_post_meta( $post->ID, $key, true ); |
| 415 | } |
| 416 | |
| 417 | return array( |
| 418 | 'id' => (int) $post->ID, |
| 419 | 'title' => $post->post_title, |
| 420 | 'content' => $post->post_content, |
| 421 | 'status' => $post->post_status, |
| 422 | 'meta' => $meta, |
| 423 | ); |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * Sanitize serialized caption-cue block content. |
| 428 | * |
| 429 | * The client canonicalizes cue text before saving, but a direct API call |
| 430 | * could embed a WebVTT/comment terminator (`-->`) in a cue's text and corrupt |
| 431 | * block parsing or the WebVTT the track is later serialized to. Re-parse the |
| 432 | * blocks, keep only caption-cue blocks, neutralize the terminator in each |
| 433 | * cue's text, and rebuild each cue as a void block from its name and |
| 434 | * attributes only, so no submitted inner HTML survives into stored content. |
| 435 | * |
| 436 | * @param string $content Raw serialized block content. |
| 437 | * @return string|\WP_Error Sanitized block content, or an error when the payload exceeds the size caps. |
| 438 | */ |
| 439 | private static function sanitize_track_content( $content ) { |
| 440 | $content = (string) $content; |
| 441 | if ( '' === trim( $content ) ) { |
| 442 | return ''; |
| 443 | } |
| 444 | |
| 445 | if ( strlen( $content ) > self::MAX_CONTENT_BYTES ) { |
| 446 | return self::track_too_large_error(); |
| 447 | } |
| 448 | |
| 449 | $sanitized = array(); |
| 450 | foreach ( parse_blocks( $content ) as $block ) { |
| 451 | if ( Caption_Tracks::CUE_BLOCK_NAME !== ( $block['blockName'] ?? '' ) ) { |
| 452 | continue; |
| 453 | } |
| 454 | |
| 455 | $attrs = isset( $block['attrs'] ) && is_array( $block['attrs'] ) ? $block['attrs'] : array(); |
| 456 | if ( isset( $attrs['text'] ) ) { |
| 457 | $attrs['text'] = str_replace( |
| 458 | array( '--!>', '-->' ), |
| 459 | '->', |
| 460 | (string) $attrs['text'] |
| 461 | ); |
| 462 | } |
| 463 | |
| 464 | $sanitized[] = array( |
| 465 | 'blockName' => Caption_Tracks::CUE_BLOCK_NAME, |
| 466 | 'attrs' => $attrs, |
| 467 | 'innerBlocks' => array(), |
| 468 | 'innerHTML' => '', |
| 469 | 'innerContent' => array(), |
| 470 | ); |
| 471 | } |
| 472 | |
| 473 | if ( count( $sanitized ) > self::MAX_CUE_BLOCKS ) { |
| 474 | return self::track_too_large_error(); |
| 475 | } |
| 476 | |
| 477 | return serialize_blocks( $sanitized ); |
| 478 | } |
| 479 | |
| 480 | /** |
| 481 | * Error returned when submitted track content exceeds the size caps. |
| 482 | * |
| 483 | * @return \WP_Error |
| 484 | */ |
| 485 | private static function track_too_large_error() { |
| 486 | return new \WP_Error( |
| 487 | 'videopress_caption_track_too_large', |
| 488 | esc_html__( 'The caption track content is too large.', 'jetpack-videopress-pkg' ), |
| 489 | array( 'status' => 400 ) |
| 490 | ); |
| 491 | } |
| 492 | |
| 493 | /** |
| 494 | * Whether the current user may manage caption tracks for a VideoPress GUID. |
| 495 | * |
| 496 | * Editing a video's captions requires the ability to edit that video. Where |
| 497 | * the GUID resolver is unavailable (an environment without a local |
| 498 | * attachment store, e.g. WordPress.com) ownership can't be verified, so the |
| 499 | * fallback requires `edit_others_posts` rather than the far broader |
| 500 | * `upload_files`: without it any author could manage another author's video |
| 501 | * captions. The resolver ships with this package, so this fallback is a rare |
| 502 | * last resort. |
| 503 | * |
| 504 | * @param string $guid VideoPress GUID. |
| 505 | * @return bool |
| 506 | */ |
| 507 | private static function current_user_can_edit_video( $guid ) { |
| 508 | $guid = Caption_Tracks::sanitize_guid( $guid ); |
| 509 | |
| 510 | if ( '' === $guid ) { |
| 511 | return false; |
| 512 | } |
| 513 | |
| 514 | if ( function_exists( 'videopress_get_post_by_guid' ) ) { |
| 515 | $attachment = videopress_get_post_by_guid( $guid ); |
| 516 | |
| 517 | return $attachment instanceof \WP_Post && current_user_can( 'edit_post', $attachment->ID ); |
| 518 | } |
| 519 | |
| 520 | return current_user_can( 'edit_others_posts' ); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | if ( defined( 'IS_WPCOM' ) && IS_WPCOM ) { |
| 525 | wpcom_rest_api_v2_load_plugin( 'Automattic\Jetpack\VideoPress\WPCOM_REST_API_V2_Endpoint_VideoPress_Caption_Tracks' ); |
| 526 | } |