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| 1 | <?php |
| 2 | /** |
| 3 | * Generation and serving of the site's llms.txt. |
| 4 | * |
| 5 | * Serves a root-level `/llms.txt` — the emerging convention (llmstxt.org) for |
| 6 | * giving AI assistants a curated, Markdown map of a site's key content. Gated on |
| 7 | * the durable option `jetpack_seo_llms_txt_enabled` (round-tripped through core's |
| 8 | * `/wp/v2/settings` endpoint by the GEO tab). |
| 9 | * |
| 10 | * Serving approach: this hooks `template_redirect` and inspects the raw request |
| 11 | * path rather than registering a rewrite rule, so it needs no rewrite flush and |
| 12 | * works under any permalink structure. The tradeoff — it matches a root-level |
| 13 | * request only, and like robots.txt won't apply on a multisite subdirectory or |
| 14 | * a site fronted by a static file. Hardening the serving path (a rewrite rule, |
| 15 | * caching) is tracked separately in JETPACK-1830. |
| 16 | * |
| 17 | * @package automattic/jetpack-seo-package |
| 18 | */ |
| 19 | |
| 20 | namespace Automattic\Jetpack\SEO; |
| 21 | |
| 22 | /** |
| 23 | * Builds and serves the site's llms.txt. |
| 24 | */ |
| 25 | class Llms_Txt { |
| 26 | |
| 27 | /** |
| 28 | * Option recording whether llms.txt generation is enabled. Mirrored as a |
| 29 | * literal in the plugin's settings endpoint whitelist (`jp_group => |
| 30 | * 'seo-tools'`). |
| 31 | * |
| 32 | * @var string |
| 33 | */ |
| 34 | const OPTION = 'jetpack_seo_llms_txt_enabled'; |
| 35 | |
| 36 | /** |
| 37 | * Max items listed per supported content type, so a large site doesn't dump |
| 38 | * its whole tree. Pages in the main menu are listed even past it. |
| 39 | */ |
| 40 | const MAX_POSTS_PER_TYPE = 50; |
| 41 | |
| 42 | /** |
| 43 | * Max main-menu pages listed, so a mega menu can't list a whole site. |
| 44 | */ |
| 45 | const MAX_MAIN_MENU_PAGES = 100; |
| 46 | |
| 47 | /** |
| 48 | * Page meta an owner sets to always list a page in llms.txt. |
| 49 | * |
| 50 | * @var string |
| 51 | */ |
| 52 | const META_ALWAYS_INCLUDE = 'jetpack_seo_llms_txt_always_include'; |
| 53 | |
| 54 | /** |
| 55 | * Wire the front-end request handler. |
| 56 | * |
| 57 | * @return void |
| 58 | */ |
| 59 | public static function init() { |
| 60 | add_action( 'template_redirect', array( __CLASS__, 'maybe_serve' ) ); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Register the always-include page meta, so the Content tab can read and save it |
| 65 | * through core REST like the page's other SEO fields, and keep it off on hidden pages. |
| 66 | * |
| 67 | * @return void |
| 68 | */ |
| 69 | public static function register_always_include() { |
| 70 | register_post_meta( |
| 71 | 'page', |
| 72 | self::META_ALWAYS_INCLUDE, |
| 73 | array( |
| 74 | 'type' => 'boolean', |
| 75 | // Not translated: this runs before `init`, too early to load the text domain. |
| 76 | 'description' => 'Whether to always list the page in llms.txt.', |
| 77 | 'single' => true, |
| 78 | 'default' => false, |
| 79 | 'show_in_rest' => true, |
| 80 | ) |
| 81 | ); |
| 82 | foreach ( array( 'added_post_meta', 'updated_post_meta' ) as $hook ) { |
| 83 | add_action( $hook, array( __CLASS__, 'clear_always_include_on_hide' ), 10, 4 ); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Switch "Always include" off when a page is hidden from search engines, from any editor, |
| 89 | * so un-hiding the page doesn't bring it back. |
| 90 | * |
| 91 | * @param int $meta_id Meta ID. |
| 92 | * @param int $post_id Post ID. |
| 93 | * @param string $meta_key Meta key. |
| 94 | * @param mixed $meta_value Meta value. |
| 95 | * @return void |
| 96 | */ |
| 97 | public static function clear_always_include_on_hide( $meta_id, $post_id, $meta_key, $meta_value ) { |
| 98 | if ( Content_Coverage::META_NOINDEX === $meta_key && $meta_value && 'page' === get_post_type( $post_id ) ) { |
| 99 | delete_post_meta( $post_id, self::META_ALWAYS_INCLUDE ); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Whether llms.txt generation is currently switched on. |
| 105 | * |
| 106 | * @return bool |
| 107 | */ |
| 108 | public static function is_enabled() { |
| 109 | return (bool) get_option( self::OPTION, false ); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Whether Jetpack can serve llms.txt without a plugin, static-file or hosting conflict. |
| 114 | * |
| 115 | * Hosts can signal path restrictions through the jetpack_seo_llms_txt_can_serve filter. |
| 116 | * |
| 117 | * @return bool |
| 118 | */ |
| 119 | public static function can_serve() { |
| 120 | if ( Seo_Tools::is_disabled() ) { |
| 121 | return false; |
| 122 | } |
| 123 | |
| 124 | $has_static_file = defined( 'ABSPATH' ) && Static_Files::exists( 'llms.txt' ); |
| 125 | |
| 126 | /** |
| 127 | * Filters whether WordPress can serve the dynamic `/llms.txt`. Hosts that |
| 128 | * intercept root-level paths before WordPress runs can return false to |
| 129 | * surface the honest "can't take effect" state in the SEO dashboard. |
| 130 | * |
| 131 | * @since 0.7.0 |
| 132 | * |
| 133 | * @param bool $can_serve Whether WordPress can serve `/llms.txt`. |
| 134 | */ |
| 135 | return (bool) apply_filters( 'jetpack_seo_llms_txt_can_serve', ! $has_static_file ); |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * The site-root-relative request path, normalized without surrounding |
| 140 | * slashes (e.g. `llms.txt`). |
| 141 | * |
| 142 | * @return string |
| 143 | */ |
| 144 | private static function request_path() { |
| 145 | if ( empty( $_SERVER['REQUEST_URI'] ) ) { |
| 146 | return ''; |
| 147 | } |
| 148 | $uri = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ); |
| 149 | $path = (string) wp_parse_url( $uri, PHP_URL_PATH ); |
| 150 | return trim( $path, '/' ); |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Serve llms.txt when enabled and the request is for it; otherwise no-op. |
| 155 | * |
| 156 | * @return void |
| 157 | */ |
| 158 | public static function maybe_serve() { |
| 159 | if ( ! self::is_enabled() || 'llms.txt' !== self::request_path() || ! self::can_serve() ) { |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | // Respect the site's "discourage search engines" setting. When indexing is |
| 164 | // discouraged, WordPress emits `Disallow: /` in robots.txt — serving an AI |
| 165 | // content map would contradict that signal, and would expose a content map |
| 166 | // on staging/private sites, so we don't serve it. |
| 167 | if ( ! get_option( 'blog_public' ) ) { |
| 168 | return; |
| 169 | } |
| 170 | |
| 171 | nocache_headers(); |
| 172 | status_header( 200 ); |
| 173 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 174 | |
| 175 | // Content is plain-text Markdown; not HTML, so it's emitted as-is. |
| 176 | echo self::generate(); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped |
| 177 | exit; |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Build the llms.txt Markdown document from site identity and published |
| 182 | * supported content types. |
| 183 | * |
| 184 | * @return string |
| 185 | */ |
| 186 | public static function generate() { |
| 187 | $name = wp_strip_all_tags( get_bloginfo( 'name' ) ); |
| 188 | $description = wp_strip_all_tags( get_bloginfo( 'description' ) ); |
| 189 | |
| 190 | $blocks = array(); |
| 191 | |
| 192 | $blocks[] = '# ' . ( '' !== $name ? $name : home_url() ); |
| 193 | if ( '' !== $description ) { |
| 194 | $blocks[] = '> ' . $description; |
| 195 | } |
| 196 | |
| 197 | foreach ( self::get_llms_post_type_objects() as $post_type ) { |
| 198 | $list = self::link_list( self::get_posts_for_type( $post_type->name ) ); |
| 199 | if ( '' !== $list ) { |
| 200 | $blocks[] = '## ' . self::section_title( $post_type ) . "\n\n" . $list; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | return implode( "\n\n", $blocks ) . "\n"; |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Return supported post types in llms.txt reading order. |
| 209 | * |
| 210 | * @return \WP_Post_Type[] |
| 211 | */ |
| 212 | private static function get_llms_post_type_objects() { |
| 213 | $post_types = Post_Types::get_supported_content_type_objects(); |
| 214 | $ordered = array(); |
| 215 | |
| 216 | foreach ( array( 'page', 'post' ) as $post_type ) { |
| 217 | if ( isset( $post_types[ $post_type ] ) ) { |
| 218 | $ordered[ $post_type ] = $post_types[ $post_type ]; |
| 219 | unset( $post_types[ $post_type ] ); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | return array_merge( $ordered, $post_types ); |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * Fetch published content for a supported post type. |
| 228 | * |
| 229 | * @param string $post_type Post type slug. |
| 230 | * @return \WP_Post[] |
| 231 | */ |
| 232 | private static function get_posts_for_type( $post_type ) { |
| 233 | if ( 'page' === $post_type ) { |
| 234 | return self::get_pages(); |
| 235 | } |
| 236 | |
| 237 | $args = self::query_args( $post_type ); |
| 238 | $args['posts_per_page'] = self::MAX_POSTS_PER_TYPE; |
| 239 | $args['orderby'] = 'date'; |
| 240 | $args['order'] = 'DESC'; |
| 241 | |
| 242 | return get_posts( $args ); |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Pages ranked: the ones the owner always includes, then the main menu, then other |
| 247 | * displayed menus, then the rest by {@see get_pages_by_order()}. |
| 248 | * |
| 249 | * @return \WP_Post[] |
| 250 | */ |
| 251 | private static function get_pages() { |
| 252 | $always_included = self::get_always_included_pages(); |
| 253 | $skip = wp_list_pluck( $always_included, 'ID' ); |
| 254 | $menus = Nav_Menu_Pages::get(); |
| 255 | $main = self::get_pages_in_order( array_values( array_diff( $menus['main'], $skip ) ), self::MAX_MAIN_MENU_PAGES ); |
| 256 | $room = max( 0, self::MAX_POSTS_PER_TYPE - count( $always_included ) - count( $main ) ); |
| 257 | $other = self::get_pages_in_order( array_values( array_diff( $menus['other'], $skip ) ), $room ); |
| 258 | $room -= count( $other ); |
| 259 | if ( $room <= 0 ) { |
| 260 | return array_merge( $always_included, $main, $other ); |
| 261 | } |
| 262 | |
| 263 | $args = self::query_args( 'page' ); |
| 264 | $args['posts_per_page'] = $room; |
| 265 | $args['post__not_in'] = array_merge( $skip, $menus['main'], $menus['other'] ); |
| 266 | |
| 267 | return array_merge( $always_included, $main, $other, self::get_pages_by_order( $args ) ); |
| 268 | } |
| 269 | |
| 270 | /** |
| 271 | * Listable pages the owner switched on to always include, sorted by {@see get_pages_by_order()}. |
| 272 | * |
| 273 | * @return \WP_Post[] |
| 274 | */ |
| 275 | private static function get_always_included_pages() { |
| 276 | $args = self::query_args( 'page' ); |
| 277 | $args['meta_query'] = array( |
| 278 | // @phan-suppress-next-line PhanPluginMixedKeyNoKey |
| 279 | 'relation' => 'AND', |
| 280 | $args['meta_query'], |
| 281 | array( |
| 282 | 'key' => self::META_ALWAYS_INCLUDE, |
| 283 | 'value' => '1', |
| 284 | ), |
| 285 | ); |
| 286 | $args['posts_per_page'] = -1; |
| 287 | |
| 288 | return self::get_pages_by_order( $args ); |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Run a page query sorted by the page Order, lowest first, with pages whose Order was |
| 293 | * set ahead of untouched ones (Order 0), then by title. |
| 294 | * |
| 295 | * @param array $args Query arguments. |
| 296 | * @return \WP_Post[] |
| 297 | */ |
| 298 | private static function get_pages_by_order( array $args ) { |
| 299 | $flag = 'jetpack_seo_llms_txt_order'; |
| 300 | $args[ $flag ] = true; |
| 301 | $orderby = static function ( $sql, $query ) use ( $flag ) { |
| 302 | global $wpdb; |
| 303 | if ( ! $query->get( $flag ) ) { |
| 304 | return $sql; |
| 305 | } |
| 306 | // `menu_order = 0` is 0 for pages with an Order set and 1 for untouched ones, so ASC lists |
| 307 | // pages with an Order first; each group then sorts by Order, then title. |
| 308 | return "({$wpdb->posts}.menu_order = 0) ASC, {$wpdb->posts}.menu_order ASC, {$wpdb->posts}.post_title ASC"; |
| 309 | }; |
| 310 | |
| 311 | add_filter( 'posts_orderby', $orderby, 10, 2 ); |
| 312 | $posts = get_posts( $args ); |
| 313 | remove_filter( 'posts_orderby', $orderby, 10 ); |
| 314 | |
| 315 | return $posts; |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Fetch listable pages by ID, keeping the given order. |
| 320 | * |
| 321 | * @param int[] $ids Page IDs. |
| 322 | * @param int $limit Max pages to return. |
| 323 | * @return \WP_Post[] |
| 324 | */ |
| 325 | private static function get_pages_in_order( array $ids, $limit ) { |
| 326 | if ( empty( $ids ) || $limit <= 0 ) { |
| 327 | return array(); |
| 328 | } |
| 329 | |
| 330 | $args = self::query_args( 'page' ); |
| 331 | $args['post__in'] = $ids; |
| 332 | $args['orderby'] = 'post__in'; |
| 333 | $args['posts_per_page'] = $limit; |
| 334 | |
| 335 | return get_posts( $args ); |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * Query arguments for published content that isn't password protected or hidden from |
| 340 | * search engines. |
| 341 | * |
| 342 | * @param string $post_type Post type slug. |
| 343 | * @return array |
| 344 | */ |
| 345 | private static function query_args( $post_type ) { |
| 346 | return array( |
| 347 | 'post_type' => $post_type, |
| 348 | 'post_status' => 'publish', |
| 349 | 'has_password' => false, |
| 350 | 'suppress_filters' => false, |
| 351 | 'meta_query' => array( |
| 352 | // WP_Query's meta_query takes its `relation` as a keyed entry alongside |
| 353 | // the positional clauses below; the mixed shape is required, not a slip. |
| 354 | // @phan-suppress-next-line PhanPluginMixedKeyNoKey |
| 355 | 'relation' => 'OR', |
| 356 | array( |
| 357 | 'key' => Content_Coverage::META_NOINDEX, |
| 358 | 'compare' => 'NOT EXISTS', |
| 359 | ), |
| 360 | array( |
| 361 | 'key' => Content_Coverage::META_NOINDEX, |
| 362 | 'value' => '1', |
| 363 | 'compare' => '!=', |
| 364 | ), |
| 365 | ), |
| 366 | ); |
| 367 | } |
| 368 | |
| 369 | /** |
| 370 | * Section title for a supported post type. |
| 371 | * |
| 372 | * @param \WP_Post_Type $post_type Post type object. |
| 373 | * @return string |
| 374 | */ |
| 375 | private static function section_title( $post_type ) { |
| 376 | if ( 'page' === $post_type->name ) { |
| 377 | return __( 'Pages', 'jetpack-seo' ); |
| 378 | } |
| 379 | if ( 'post' === $post_type->name ) { |
| 380 | return __( 'Posts', 'jetpack-seo' ); |
| 381 | } |
| 382 | return wp_strip_all_tags( $post_type->label ); |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * Render a list of posts as llms.txt link lines: |
| 387 | * `- [Title](url): summary`. |
| 388 | * |
| 389 | * @param \WP_Post[] $posts Posts to render. |
| 390 | * @return string Newline-joined link lines, or '' when there are none. |
| 391 | */ |
| 392 | private static function link_list( $posts ) { |
| 393 | $lines = array(); |
| 394 | foreach ( $posts as $post ) { |
| 395 | // Password-protected posts are `publish` status but their content is |
| 396 | // intentionally gated; keep them out of the public llms.txt entirely. |
| 397 | if ( ! empty( $post->post_password ) ) { |
| 398 | continue; |
| 399 | } |
| 400 | |
| 401 | // Collapse whitespace (incl. newlines) so each entry stays on one line. |
| 402 | $title = trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( get_the_title( $post ) ) ) ); |
| 403 | if ( '' === $title ) { |
| 404 | $title = __( '(untitled)', 'jetpack-seo' ); |
| 405 | } |
| 406 | // Escape brackets so a title can't break the `[title](url)` link syntax. |
| 407 | $title = str_replace( array( '[', ']' ), array( '\[', '\]' ), $title ); |
| 408 | $url = esc_url_raw( (string) get_permalink( $post ) ); |
| 409 | $line = '- [' . $title . '](' . $url . ')'; |
| 410 | |
| 411 | $summary = self::summary( $post ); |
| 412 | if ( '' !== $summary ) { |
| 413 | $line .= ': ' . $summary; |
| 414 | } |
| 415 | $lines[] = $line; |
| 416 | } |
| 417 | return implode( "\n", $lines ); |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * A short, single-line summary for a post: its excerpt when set, otherwise a |
| 422 | * trimmed slice of the content. |
| 423 | * |
| 424 | * @param \WP_Post $post Post to summarize. |
| 425 | * @return string |
| 426 | */ |
| 427 | private static function summary( $post ) { |
| 428 | if ( has_excerpt( $post ) ) { |
| 429 | // A manual excerpt is a deliberate public summary; a body gate does not withhold it. |
| 430 | $raw = get_the_excerpt( $post ); |
| 431 | } elseif ( Content_Gate::is_gated( $post ) ) { |
| 432 | $teaser = Content_Gate::public_teaser( $post ); |
| 433 | if ( '' === $teaser ) { |
| 434 | return ''; |
| 435 | } |
| 436 | $raw = wp_trim_words( wp_strip_all_tags( strip_shortcodes( $teaser ) ), 30, '' ); |
| 437 | } else { |
| 438 | $raw = wp_trim_words( wp_strip_all_tags( strip_shortcodes( get_the_excerpt( $post ) ) ), 30, '' ); |
| 439 | } |
| 440 | |
| 441 | // Collapse whitespace so a link line stays on one row. |
| 442 | return trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( $raw ) ) ); |
| 443 | } |
| 444 | } |