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| 1 | <?php |
| 2 | /** |
| 3 | * Adds podcast tags + tracked enclosure URLs to the RSS feed for the |
| 4 | * configured podcast category. |
| 5 | * |
| 6 | * @package automattic/jetpack-podcast |
| 7 | */ |
| 8 | |
| 9 | declare( strict_types = 1 ); |
| 10 | |
| 11 | namespace Automattic\Jetpack\Podcast\Feed; |
| 12 | |
| 13 | use Automattic\Jetpack\Connection\Manager as Connection_Manager; |
| 14 | use Automattic\Jetpack\Podcast\Settings; |
| 15 | use WP_Post; |
| 16 | |
| 17 | /** |
| 18 | * Hooks into RSS2 rendering when the current request is the podcast category |
| 19 | * feed, adding `<itunes:*>` + `<podcast:*>` tags at channel and item level |
| 20 | * and rewriting `<enclosure>` URLs through the WPCOM stats endpoint. |
| 21 | */ |
| 22 | class Customize_Feed { |
| 23 | |
| 24 | /** |
| 25 | * Whether `init()` has wired its hooks. |
| 26 | * |
| 27 | * @var bool |
| 28 | */ |
| 29 | private static $registered = false; |
| 30 | |
| 31 | /** |
| 32 | * Wire the late-binding `wp` action that decides whether to register the |
| 33 | * feed-modification hooks for this request. Idempotent. |
| 34 | */ |
| 35 | public static function init() { |
| 36 | if ( self::$registered ) { |
| 37 | return; |
| 38 | } |
| 39 | self::$registered = true; |
| 40 | |
| 41 | add_action( 'wp', array( __CLASS__, 'maybe_register_feed_hooks' ) ); |
| 42 | |
| 43 | // `the_posts` fires during query execution — before the `wp` action — |
| 44 | // so it has to be registered up-front and self-gated to the podcast |
| 45 | // feed query, rather than wired conditionally in `maybe_register_feed_hooks`. |
| 46 | add_filter( 'the_posts', array( __CLASS__, 'filter_posts_with_enclosure' ), 10, 2 ); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Register the RSS2 hooks if this request is the configured podcast feed. |
| 51 | * Also fires `Feed_Detection` while we're here — same gating, no need to |
| 52 | * walk the post query twice. |
| 53 | */ |
| 54 | public static function maybe_register_feed_hooks() { |
| 55 | if ( ! is_feed() ) { |
| 56 | return; |
| 57 | } |
| 58 | $category_id = self::resolve_category_id(); |
| 59 | if ( 0 === $category_id || ! is_category( $category_id ) ) { |
| 60 | return; |
| 61 | } |
| 62 | |
| 63 | // Strip channel-level tags that conflict with the iTunes-compliant |
| 64 | // header: blavatar / site-icon `<image>` duplicates `<itunes:image>`, |
| 65 | // and `<cloud …/>` from rsscloud isn't part of the podcast spec. |
| 66 | remove_action( 'rss2_head', 'rss2_blavatar' ); |
| 67 | remove_action( 'rss2_head', 'rss2_site_icon' ); |
| 68 | remove_action( 'rss2_head', 'rsscloud_add_rss_cloud_element' ); |
| 69 | |
| 70 | add_action( 'rss2_ns', array( __CLASS__, 'output_namespaces' ) ); |
| 71 | add_filter( 'wp_title_rss', array( __CLASS__, 'feed_title' ) ); |
| 72 | add_filter( 'bloginfo_rss', array( __CLASS__, 'feed_description' ), 10, 2 ); |
| 73 | add_action( 'rss2_head', array( __CLASS__, 'output_channel_tags' ) ); |
| 74 | add_action( 'rss2_item', array( __CLASS__, 'output_item_tags' ) ); |
| 75 | add_filter( 'rss_enclosure', array( __CLASS__, 'rewrite_enclosure' ) ); |
| 76 | |
| 77 | // Prune RSS chrome that podcatchers don't read. Cuts payload size and |
| 78 | // keeps incidental post data (body content, gravatar URLs, image EXIF, |
| 79 | // comments metadata) out of a feed whose only job is to deliver |
| 80 | // podcast episode metadata + the audio enclosure. |
| 81 | // |
| 82 | // - option_rss_use_excerpt -> suppresses content:encoded (full post body, incl. EXIF in image attrs). |
| 83 | // - comments_open + get_comments_number -> together suppress per-item comments / wfw:commentRss / slash:comments. |
| 84 | // - the_category_rss -> suppresses per-item category tags (channel itunes:category is the podcatcher signal). |
| 85 | // - removing wpcom mrss.php hooks -> suppresses media:content for author gravatar + post images. |
| 86 | add_filter( 'option_rss_use_excerpt', '__return_true' ); |
| 87 | add_filter( 'comments_open', '__return_false' ); |
| 88 | add_filter( 'get_comments_number', '__return_zero' ); |
| 89 | add_filter( 'the_category_rss', '__return_empty_string' ); |
| 90 | remove_action( 'rss2_item', 'mrss_item', 10 ); |
| 91 | remove_action( 'rss2_item', 'mrss_news_item' ); |
| 92 | |
| 93 | Feed_Detection::detect_and_record(); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Add iTunes and Podcasting 2.0 XML namespaces to the `<rss>` open tag. |
| 98 | */ |
| 99 | public static function output_namespaces() { |
| 100 | echo "\n\t" . 'xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd"' . "\n"; |
| 101 | echo "\t" . 'xmlns:podcast="https://podcastindex.org/namespace/1.0"' . "\n"; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Override the feed title with `podcasting_title`, falling back to |
| 106 | * `Blog Name » Category Name`. |
| 107 | * |
| 108 | * @param string $title Existing title. |
| 109 | * @return string |
| 110 | */ |
| 111 | public static function feed_title( $title ) { |
| 112 | $override = (string) get_option( 'podcasting_title', '' ); |
| 113 | if ( '' !== $override ) { |
| 114 | return esc_xml( $override ); |
| 115 | } |
| 116 | |
| 117 | $category = get_category( self::resolve_category_id() ); |
| 118 | if ( $category && ! is_wp_error( $category ) ) { |
| 119 | return esc_xml( get_bloginfo( 'name' ) ) . ' » ' . esc_xml( $category->name ); |
| 120 | } |
| 121 | return esc_xml( $title ); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Replace the `bloginfo_rss('description')` value with `podcasting_summary`. |
| 126 | * |
| 127 | * `bloginfo_rss()` echoes the filter return value directly, so we strip and |
| 128 | * escape here — matches the channel-level `<itunes:summary>` treatment and |
| 129 | * keeps stray markup in the option from leaking into `<description>`. |
| 130 | * |
| 131 | * @param string $value Existing value. |
| 132 | * @param string $field Field being requested. |
| 133 | * @return string |
| 134 | */ |
| 135 | public static function feed_description( $value, $field ) { |
| 136 | if ( 'description' !== $field ) { |
| 137 | return $value; |
| 138 | } |
| 139 | return esc_xml( wp_strip_all_tags( (string) get_option( 'podcasting_summary', '' ) ) ); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Channel-level podcast tags (rss2_head). |
| 144 | */ |
| 145 | public static function output_channel_tags() { |
| 146 | $summary = (string) get_option( 'podcasting_summary', '' ); |
| 147 | if ( '' !== $summary ) { |
| 148 | echo '<itunes:summary>' . esc_xml( wp_strip_all_tags( $summary ) ) . "</itunes:summary>\n"; |
| 149 | } |
| 150 | |
| 151 | $author = (string) get_option( 'podcasting_talent_name', '' ); |
| 152 | if ( '' !== $author ) { |
| 153 | echo '<itunes:author>' . esc_xml( wp_strip_all_tags( $author ) ) . "</itunes:author>\n"; |
| 154 | } |
| 155 | |
| 156 | $email = wp_strip_all_tags( (string) get_option( 'podcasting_email', '' ) ); |
| 157 | if ( '' !== $email ) { |
| 158 | echo '<itunes:owner><itunes:email>' . esc_xml( $email ) . "</itunes:email></itunes:owner>\n"; |
| 159 | } |
| 160 | |
| 161 | $copyright = (string) get_option( 'podcasting_copyright', '' ); |
| 162 | if ( '' !== $copyright ) { |
| 163 | echo '<copyright>' . esc_xml( wp_strip_all_tags( $copyright ) ) . "</copyright>\n"; |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Explicit content flag |
| 168 | */ |
| 169 | echo '<itunes:explicit>' . esc_html( self::explicit_string() ) . "</itunes:explicit>\n"; |
| 170 | |
| 171 | $image = self::show_image_url(); |
| 172 | if ( '' !== $image ) { |
| 173 | echo '<itunes:image href="' . esc_url( $image ) . '" />' . "\n"; |
| 174 | } |
| 175 | |
| 176 | echo self::category_tag( (string) get_option( 'podcasting_category_1', '' ) ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Pre-escaped XML fragment. |
| 177 | echo self::category_tag( (string) get_option( 'podcasting_category_2', '' ) ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Pre-escaped XML fragment. |
| 178 | echo self::category_tag( (string) get_option( 'podcasting_category_3', '' ) ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Pre-escaped XML fragment. |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Item-level podcast tags (rss2_item). |
| 183 | */ |
| 184 | public static function output_item_tags() { |
| 185 | global $post; |
| 186 | |
| 187 | if ( ! $post instanceof WP_Post ) { |
| 188 | return; |
| 189 | } |
| 190 | |
| 191 | $author = get_the_author(); |
| 192 | if ( '' === $author ) { |
| 193 | $author = (string) get_option( 'podcasting_talent_name', '' ); |
| 194 | } |
| 195 | if ( '' !== $author ) { |
| 196 | echo '<itunes:author>' . esc_xml( wp_strip_all_tags( $author ) ) . "</itunes:author>\n"; |
| 197 | } |
| 198 | |
| 199 | // Re-applying `the_excerpt_rss` so `<itunes:summary>` matches whatever |
| 200 | // the item's `<description>` ends up emitting — `get_the_excerpt()` |
| 201 | // doesn't run the filter chain itself. |
| 202 | $excerpt = (string) apply_filters( 'the_excerpt_rss', get_the_excerpt() ); |
| 203 | if ( '' !== $excerpt ) { |
| 204 | echo '<itunes:summary>' . esc_xml( wp_strip_all_tags( $excerpt ) ) . "</itunes:summary>\n"; |
| 205 | } |
| 206 | |
| 207 | // Per-item cover art: prefer the block's `coverArt`, fall back to the |
| 208 | // post's featured image. Either way, photon-resize to 3000×3000 to |
| 209 | // honour Apple's square-cover requirement. When neither is present |
| 210 | // the channel-level `<itunes:image>` applies as default per spec. |
| 211 | $attrs = Episode_Block_Tags::get_block_attrs( $post ); |
| 212 | $cover_url = isset( $attrs['coverArt']['url'] ) ? trim( (string) $attrs['coverArt']['url'] ) : ''; |
| 213 | $item_image = '' !== $cover_url ? self::maybe_photon( $cover_url ) : self::episode_image_url( $post->ID ); |
| 214 | if ( '' !== $item_image ) { |
| 215 | echo '<itunes:image href="' . esc_url( $item_image ) . '" />' . "\n"; |
| 216 | } |
| 217 | |
| 218 | // Block-driven iTunes + Podcasting 2.0 tags. Legacy audio posts |
| 219 | // without the block contribute nothing — they keep their pre-block |
| 220 | // behavior intact aside from the cover art handled above. |
| 221 | if ( ! empty( $attrs ) ) { |
| 222 | Episode_Block_Tags::render_from_attrs( $attrs ); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Rewrite the enclosure URL through the WPCOM stats endpoint and append |
| 228 | * `<itunes:duration>` when resolvable. Duration is looked up against the |
| 229 | * *original* attachment URL — the stats URL is synthetic. |
| 230 | * |
| 231 | * @param string $enclosure Generated enclosure markup. |
| 232 | * @return string |
| 233 | */ |
| 234 | public static function rewrite_enclosure( $enclosure ) { |
| 235 | global $post; |
| 236 | |
| 237 | if ( ! preg_match( '/url="([^"]*)"/i', $enclosure, $match ) ) { |
| 238 | return $enclosure; |
| 239 | } |
| 240 | |
| 241 | $original_url = $match[1]; |
| 242 | $post_obj = $post instanceof WP_Post ? $post : null; |
| 243 | |
| 244 | /** |
| 245 | * Whether to rewrite the enclosure through the WPCOM stats endpoint. |
| 246 | * Token-gated feeds (notably WPCOM's `private-podcasts.php`) opt out |
| 247 | * — the stats URL is a deterministic public endpoint that would |
| 248 | * bypass any token gating on the feed itself. |
| 249 | * |
| 250 | * @param bool $enable Default true. |
| 251 | * @param WP_Post|null $post The post being rendered. |
| 252 | */ |
| 253 | $enable = (bool) apply_filters( 'wpcom_podcasting_enable_play_tracking', true, $post_obj ); |
| 254 | |
| 255 | // Skip rewrite for externally hosted enclosures — the stats endpoint 404s anything that isn't a local attachment. |
| 256 | $attachment_id = attachment_url_to_postid( $original_url ); |
| 257 | |
| 258 | if ( null !== $post_obj && $enable && $attachment_id > 0 ) { |
| 259 | // `null` when the site isn't connected; passed through so the filter can still inject a value. |
| 260 | $default_blog_id = Connection_Manager::get_site_id( true ); |
| 261 | |
| 262 | /** |
| 263 | * Override the blog ID baked into the stats URL. |
| 264 | * |
| 265 | * @param int|null $blog_id Default Jetpack connection site ID, or null when unavailable. |
| 266 | * @param WP_Post $post The post being rendered. |
| 267 | */ |
| 268 | $blog_id = (int) apply_filters( 'wpcom_podcasting_tracked_blog_id', $default_blog_id, $post_obj ); |
| 269 | |
| 270 | // Bail when we can't resolve a real blog ID — emit the original URL rather than a guaranteed-404 stats URL. |
| 271 | if ( $blog_id > 0 ) { |
| 272 | $stats_url = self::build_stats_url( $blog_id, (int) $post_obj->ID, $original_url ); |
| 273 | $enclosure = preg_replace_callback( |
| 274 | '/url="[^"]*"/i', |
| 275 | /** |
| 276 | * Replace the matched `url="…"` attribute with the stats URL. |
| 277 | * `$matches` is required by `preg_replace_callback`'s callable |
| 278 | * signature but ignored — we always emit the same value. |
| 279 | * |
| 280 | * @param array $matches Regex matches. |
| 281 | * @return string |
| 282 | */ |
| 283 | static function ( array $matches ) use ( $stats_url ) { |
| 284 | unset( $matches ); |
| 285 | return 'url="' . esc_url( $stats_url ) . '"'; |
| 286 | }, |
| 287 | $enclosure, |
| 288 | 1 |
| 289 | ); |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | if ( 0 === $attachment_id ) { |
| 294 | return $enclosure; |
| 295 | } |
| 296 | |
| 297 | $metadata = wp_get_attachment_metadata( $attachment_id ); |
| 298 | $duration = is_array( $metadata ) ? absint( $metadata['length'] ?? 0 ) : 0; |
| 299 | |
| 300 | return 0 === $duration |
| 301 | ? $enclosure |
| 302 | : $enclosure . '<itunes:duration>' . $duration . "</itunes:duration>\n"; |
| 303 | } |
| 304 | |
| 305 | /** |
| 306 | * A podcast item without an enclosure is invalid per Apple's spec and can |
| 307 | * take down the whole submission. The `enclosure` post meta is what |
| 308 | * `rss_enclosure()` reads, so it's the authoritative signal here too. |
| 309 | * |
| 310 | * @param WP_Post[] $posts Posts about to be looped over. |
| 311 | * @param \WP_Query $query Query that produced them. |
| 312 | * @return WP_Post[] |
| 313 | */ |
| 314 | public static function filter_posts_with_enclosure( $posts, $query ) { |
| 315 | if ( ! $query->is_main_query() || ! $query->is_feed() || ! $query->is_category() ) { |
| 316 | return $posts; |
| 317 | } |
| 318 | $category_id = self::resolve_category_id(); |
| 319 | if ( 0 === $category_id ) { |
| 320 | return $posts; |
| 321 | } |
| 322 | $queried = $query->get_queried_object(); |
| 323 | if ( ! $queried || ! isset( $queried->term_id ) || (int) $queried->term_id !== $category_id ) { |
| 324 | return $posts; |
| 325 | } |
| 326 | return array_values( |
| 327 | array_filter( |
| 328 | $posts, |
| 329 | static function ( $post ) { |
| 330 | return $post instanceof WP_Post |
| 331 | && ! empty( get_post_meta( $post->ID, 'enclosure', false ) ); |
| 332 | } |
| 333 | ) |
| 334 | ); |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * Stored explicit value, normalized to the `'true'`/`'false'` strings the |
| 339 | * iTunes spec requires. Reuses `Settings::sanitize_explicit` |
| 340 | * so legacy `'yes'`/`'no'`/`'clean'` and modern boolean storage both work. |
| 341 | * |
| 342 | * @return string |
| 343 | */ |
| 344 | public static function explicit_string(): string { |
| 345 | return Settings::sanitize_explicit( get_option( 'podcasting_explicit', false ) ) ? 'true' : 'false'; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Show-level cover image URL — `Settings::raw_show_image_url()` routed |
| 350 | * through Photon at 3000×3000 when available. |
| 351 | * |
| 352 | * @return string |
| 353 | */ |
| 354 | private static function show_image_url(): string { |
| 355 | $url = Settings::raw_show_image_url(); |
| 356 | return '' === $url ? '' : self::maybe_photon( $url ); |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Build the WPCOM stats URL for a given episode. The endpoint redirects |
| 361 | * to the audio file after recording the play — the package never serves |
| 362 | * it, only points at it. Audio extensions outside the recognized set |
| 363 | * fall back to `mp3` to keep the URL shape uniform (matches the Podtrac |
| 364 | * / Megaphone / Art19 convention). |
| 365 | * |
| 366 | * @param int $blog_id WPCOM blog ID (Atomic should override via the |
| 367 | * `wpcom_podcasting_tracked_blog_id` filter). |
| 368 | * @param int $post_id Episode post ID. |
| 369 | * @param string $original_url Original enclosure URL — extension is pulled from here. |
| 370 | * @return string |
| 371 | */ |
| 372 | private static function build_stats_url( int $blog_id, int $post_id, string $original_url ): string { |
| 373 | $path = (string) wp_parse_url( $original_url, PHP_URL_PATH ); |
| 374 | $ext = (string) preg_replace( '/[^a-z0-9]/', '', strtolower( (string) pathinfo( $path, PATHINFO_EXTENSION ) ) ); |
| 375 | if ( ! in_array( $ext, array( 'mp3', 'm4a', 'm4b', 'aac', 'ogg', 'oga', 'opus', 'wav', 'flac', 'mp4', 'm4v', 'mov' ), true ) ) { |
| 376 | $ext = 'mp3'; |
| 377 | } |
| 378 | return sprintf( |
| 379 | 'https://public-api.wordpress.com/wpcom/v2/sites/%d/podcast-play/%d.%s', |
| 380 | $blog_id, |
| 381 | $post_id, |
| 382 | $ext |
| 383 | ); |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Resolve the configured podcast category ID. Prefers the numeric |
| 388 | * `podcasting_category_id`, falling back to a slug lookup against the |
| 389 | * legacy `podcasting_archive` option — older sites pre-date numeric |
| 390 | * storage and only have the slug. Returns 0 when neither resolves. |
| 391 | * |
| 392 | * A numeric ID whose term was deleted means "not configured" — the slug |
| 393 | * is not consulted in that case. |
| 394 | * |
| 395 | * @return int |
| 396 | */ |
| 397 | public static function resolve_category_id(): int { |
| 398 | $category_id = (int) get_option( 'podcasting_category_id', 0 ); |
| 399 | if ( $category_id > 0 ) { |
| 400 | $category = get_category( $category_id ); |
| 401 | return ( $category && ! is_wp_error( $category ) && isset( $category->term_id ) ) ? (int) $category->term_id : 0; |
| 402 | } |
| 403 | |
| 404 | $slug = (string) get_option( 'podcasting_archive', '' ); |
| 405 | if ( '' === $slug ) { |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | $term = get_term_by( 'slug', $slug, 'category' ); |
| 410 | return ( $term && ! is_wp_error( $term ) && isset( $term->term_id ) ) ? (int) $term->term_id : 0; |
| 411 | } |
| 412 | |
| 413 | /** |
| 414 | * Episode-level image URL — the post's featured image, Photon-resized, |
| 415 | * or `''` when no featured image is set. Used as the fallback per-item |
| 416 | * cover when the block doesn't supply its own. |
| 417 | * |
| 418 | * @param int $post_id Episode post ID. |
| 419 | * @return string |
| 420 | */ |
| 421 | private static function episode_image_url( int $post_id ): string { |
| 422 | if ( ! has_post_thumbnail( $post_id ) ) { |
| 423 | return ''; |
| 424 | } |
| 425 | $src = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), 'full' ); |
| 426 | if ( ! is_array( $src ) || empty( $src[0] ) ) { |
| 427 | return ''; |
| 428 | } |
| 429 | return self::maybe_photon( $src[0] ); |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * Route through Photon at exactly 3000×3000 so the feed always serves a |
| 434 | * square cover, regardless of the source aspect ratio. `resize` center-crops |
| 435 | * (unlike `fit`, which only constrains within the box); Apple's spec wants |
| 436 | * 1400–3000 px square art and rejects non-square covers. |
| 437 | * |
| 438 | * @param string $url Image URL. |
| 439 | * @return string |
| 440 | */ |
| 441 | public static function maybe_photon( string $url ): string { |
| 442 | if ( ! function_exists( 'jetpack_photon_url' ) ) { |
| 443 | return $url; |
| 444 | } |
| 445 | // @phan-suppress-next-line PhanUndeclaredFunction -- Provided by Jetpack's Photon module at runtime; guarded by `function_exists` above. |
| 446 | return (string) jetpack_photon_url( $url, array( 'resize' => '3000,3000' ), 'https' ); |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Build a single `<itunes:category>` tag from a stored option value. The |
| 451 | * stored format is one of: |
| 452 | * - `''` (no category) |
| 453 | * - `'Foo'` → single category |
| 454 | * - `'Foo,Bar'` → category Foo with subcategory Bar |
| 455 | * |
| 456 | * Includes a back-compat translation pass for a few legacy values that were |
| 457 | * stored in non-canonical shapes before validation tightened. |
| 458 | * |
| 459 | * @param string $stored Raw option value. |
| 460 | * @return string Empty string if no category, otherwise an XML fragment. |
| 461 | */ |
| 462 | public static function category_tag( string $stored ): string { |
| 463 | static $legacy_aliases = array( |
| 464 | 'Education,Education' => 'Education', |
| 465 | 'Education,Education Technology' => 'Education,Educational Technology', |
| 466 | 'Tech News' => 'Technology,Tech News', |
| 467 | 'Sports & Recreation,Technology' => 'Technology', |
| 468 | 'Sports & Recreation,Gadgets' => 'Technology,Gadgets', |
| 469 | 'Sports,Football' => 'Sports,American Football', |
| 470 | 'Sports,Soccer' => 'Sports,Football (Soccer)', |
| 471 | ); |
| 472 | $category = $legacy_aliases[ $stored ] ?? $stored; |
| 473 | |
| 474 | if ( '' === $category ) { |
| 475 | return ''; |
| 476 | } |
| 477 | |
| 478 | // `ent2ncr()` normalises named HTML entities (e.g. ` `, `©`) into |
| 479 | // numeric character references so an attribute value containing them stays |
| 480 | // well-formed XML after esc_attr(). |
| 481 | $splits = explode( ',', $category ); |
| 482 | if ( 2 === count( $splits ) ) { |
| 483 | return '<itunes:category text="' . ent2ncr( esc_attr( $splits[0] ) ) . '">' . "\n" |
| 484 | . "\t" . '<itunes:category text="' . ent2ncr( esc_attr( $splits[1] ) ) . '" />' . "\n" |
| 485 | . "</itunes:category>\n"; |
| 486 | } |
| 487 | return '<itunes:category text="' . ent2ncr( esc_attr( $category ) ) . '" />' . "\n"; |
| 488 | } |
| 489 | } |