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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 | * Wire the front-end request handler. |
| 49 | * |
| 50 | * @return void |
| 51 | */ |
| 52 | public static function init() { |
| 53 | add_action( 'template_redirect', array( __CLASS__, 'maybe_serve' ) ); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Whether llms.txt generation is currently switched on. |
| 58 | * |
| 59 | * @return bool |
| 60 | */ |
| 61 | public static function is_enabled() { |
| 62 | return (bool) get_option( self::OPTION, false ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Whether Jetpack can serve llms.txt without a plugin, static-file or hosting conflict. |
| 67 | * |
| 68 | * Hosts can signal path restrictions through the jetpack_seo_llms_txt_can_serve filter. |
| 69 | * |
| 70 | * @return bool |
| 71 | */ |
| 72 | public static function can_serve() { |
| 73 | if ( Seo_Tools::is_disabled() ) { |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | $has_static_file = defined( 'ABSPATH' ) && Static_Files::exists( 'llms.txt' ); |
| 78 | |
| 79 | /** |
| 80 | * Filters whether WordPress can serve the dynamic `/llms.txt`. Hosts that |
| 81 | * intercept root-level paths before WordPress runs can return false to |
| 82 | * surface the honest "can't take effect" state in the SEO dashboard. |
| 83 | * |
| 84 | * @since 0.7.0 |
| 85 | * |
| 86 | * @param bool $can_serve Whether WordPress can serve `/llms.txt`. |
| 87 | */ |
| 88 | return (bool) apply_filters( 'jetpack_seo_llms_txt_can_serve', ! $has_static_file ); |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * The site-root-relative request path, normalized without surrounding |
| 93 | * slashes (e.g. `llms.txt`). |
| 94 | * |
| 95 | * @return string |
| 96 | */ |
| 97 | private static function request_path() { |
| 98 | if ( empty( $_SERVER['REQUEST_URI'] ) ) { |
| 99 | return ''; |
| 100 | } |
| 101 | $uri = esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ); |
| 102 | $path = (string) wp_parse_url( $uri, PHP_URL_PATH ); |
| 103 | return trim( $path, '/' ); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Serve llms.txt when enabled and the request is for it; otherwise no-op. |
| 108 | * |
| 109 | * @return void |
| 110 | */ |
| 111 | public static function maybe_serve() { |
| 112 | if ( ! self::is_enabled() || 'llms.txt' !== self::request_path() || ! self::can_serve() ) { |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | // Respect the site's "discourage search engines" setting. When indexing is |
| 117 | // discouraged, WordPress emits `Disallow: /` in robots.txt — serving an AI |
| 118 | // content map would contradict that signal, and would expose a content map |
| 119 | // on staging/private sites, so we don't serve it. |
| 120 | if ( ! get_option( 'blog_public' ) ) { |
| 121 | return; |
| 122 | } |
| 123 | |
| 124 | nocache_headers(); |
| 125 | status_header( 200 ); |
| 126 | header( 'Content-Type: text/plain; charset=utf-8' ); |
| 127 | |
| 128 | // Content is plain-text Markdown; not HTML, so it's emitted as-is. |
| 129 | echo self::generate(); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped |
| 130 | exit; |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Build the llms.txt Markdown document from site identity and published |
| 135 | * supported content types. |
| 136 | * |
| 137 | * @return string |
| 138 | */ |
| 139 | public static function generate() { |
| 140 | $name = wp_strip_all_tags( get_bloginfo( 'name' ) ); |
| 141 | $description = wp_strip_all_tags( get_bloginfo( 'description' ) ); |
| 142 | |
| 143 | $blocks = array(); |
| 144 | |
| 145 | $blocks[] = '# ' . ( '' !== $name ? $name : home_url() ); |
| 146 | if ( '' !== $description ) { |
| 147 | $blocks[] = '> ' . $description; |
| 148 | } |
| 149 | |
| 150 | foreach ( self::get_llms_post_type_objects() as $post_type ) { |
| 151 | $list = self::link_list( self::get_posts_for_type( $post_type->name ) ); |
| 152 | if ( '' !== $list ) { |
| 153 | $blocks[] = '## ' . self::section_title( $post_type ) . "\n\n" . $list; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | return implode( "\n\n", $blocks ) . "\n"; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Return supported post types in llms.txt reading order. |
| 162 | * |
| 163 | * @return \WP_Post_Type[] |
| 164 | */ |
| 165 | private static function get_llms_post_type_objects() { |
| 166 | $post_types = Post_Types::get_supported_content_type_objects(); |
| 167 | $ordered = array(); |
| 168 | |
| 169 | foreach ( array( 'page', 'post' ) as $post_type ) { |
| 170 | if ( isset( $post_types[ $post_type ] ) ) { |
| 171 | $ordered[ $post_type ] = $post_types[ $post_type ]; |
| 172 | unset( $post_types[ $post_type ] ); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | return array_merge( $ordered, $post_types ); |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * Fetch published content for a supported post type. |
| 181 | * |
| 182 | * @param string $post_type Post type slug. |
| 183 | * @return \WP_Post[] |
| 184 | */ |
| 185 | private static function get_posts_for_type( $post_type ) { |
| 186 | if ( 'page' === $post_type ) { |
| 187 | return self::get_pages(); |
| 188 | } |
| 189 | |
| 190 | $args = self::query_args( $post_type ); |
| 191 | $args['posts_per_page'] = self::MAX_POSTS_PER_TYPE; |
| 192 | $args['orderby'] = 'date'; |
| 193 | $args['order'] = 'DESC'; |
| 194 | |
| 195 | return get_posts( $args ); |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Pages ranked main menu first, then other displayed menus, then the rest by |
| 200 | * {@see get_pages_by_order()}. |
| 201 | * |
| 202 | * @return \WP_Post[] |
| 203 | */ |
| 204 | private static function get_pages() { |
| 205 | $menus = Nav_Menu_Pages::get(); |
| 206 | $main = self::get_pages_in_order( $menus['main'], self::MAX_MAIN_MENU_PAGES ); |
| 207 | $room = max( 0, self::MAX_POSTS_PER_TYPE - count( $main ) ); |
| 208 | $other = self::get_pages_in_order( $menus['other'], $room ); |
| 209 | $room -= count( $other ); |
| 210 | if ( $room <= 0 ) { |
| 211 | return array_merge( $main, $other ); |
| 212 | } |
| 213 | |
| 214 | $args = self::query_args( 'page' ); |
| 215 | $args['posts_per_page'] = $room; |
| 216 | $args['post__not_in'] = array_merge( $menus['main'], $menus['other'] ); |
| 217 | |
| 218 | return array_merge( $main, $other, self::get_pages_by_order( $args ) ); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Run a page query sorted by the page Order, lowest first, with pages whose Order was |
| 223 | * set ahead of untouched ones (Order 0), then by title. |
| 224 | * |
| 225 | * @param array $args Query arguments. |
| 226 | * @return \WP_Post[] |
| 227 | */ |
| 228 | private static function get_pages_by_order( array $args ) { |
| 229 | $flag = 'jetpack_seo_llms_txt_order'; |
| 230 | $args[ $flag ] = true; |
| 231 | $orderby = static function ( $sql, $query ) use ( $flag ) { |
| 232 | global $wpdb; |
| 233 | if ( ! $query->get( $flag ) ) { |
| 234 | return $sql; |
| 235 | } |
| 236 | // `menu_order = 0` is 0 for pages with an Order set and 1 for untouched ones, so ASC lists |
| 237 | // pages with an Order first; each group then sorts by Order, then title. |
| 238 | return "({$wpdb->posts}.menu_order = 0) ASC, {$wpdb->posts}.menu_order ASC, {$wpdb->posts}.post_title ASC"; |
| 239 | }; |
| 240 | |
| 241 | add_filter( 'posts_orderby', $orderby, 10, 2 ); |
| 242 | $posts = get_posts( $args ); |
| 243 | remove_filter( 'posts_orderby', $orderby, 10 ); |
| 244 | |
| 245 | return $posts; |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Fetch listable pages by ID, keeping the given order. |
| 250 | * |
| 251 | * @param int[] $ids Page IDs. |
| 252 | * @param int $limit Max pages to return. |
| 253 | * @return \WP_Post[] |
| 254 | */ |
| 255 | private static function get_pages_in_order( array $ids, $limit ) { |
| 256 | if ( empty( $ids ) || $limit <= 0 ) { |
| 257 | return array(); |
| 258 | } |
| 259 | |
| 260 | $args = self::query_args( 'page' ); |
| 261 | $args['post__in'] = $ids; |
| 262 | $args['orderby'] = 'post__in'; |
| 263 | $args['posts_per_page'] = $limit; |
| 264 | |
| 265 | return get_posts( $args ); |
| 266 | } |
| 267 | |
| 268 | /** |
| 269 | * Query arguments for published content that isn't password protected or hidden from |
| 270 | * search engines. |
| 271 | * |
| 272 | * @param string $post_type Post type slug. |
| 273 | * @return array |
| 274 | */ |
| 275 | private static function query_args( $post_type ) { |
| 276 | return array( |
| 277 | 'post_type' => $post_type, |
| 278 | 'post_status' => 'publish', |
| 279 | 'has_password' => false, |
| 280 | 'suppress_filters' => false, |
| 281 | 'meta_query' => array( |
| 282 | // WP_Query's meta_query takes its `relation` as a keyed entry alongside |
| 283 | // the positional clauses below; the mixed shape is required, not a slip. |
| 284 | // @phan-suppress-next-line PhanPluginMixedKeyNoKey |
| 285 | 'relation' => 'OR', |
| 286 | array( |
| 287 | 'key' => Content_Coverage::META_NOINDEX, |
| 288 | 'compare' => 'NOT EXISTS', |
| 289 | ), |
| 290 | array( |
| 291 | 'key' => Content_Coverage::META_NOINDEX, |
| 292 | 'value' => '1', |
| 293 | 'compare' => '!=', |
| 294 | ), |
| 295 | ), |
| 296 | ); |
| 297 | } |
| 298 | |
| 299 | /** |
| 300 | * Section title for a supported post type. |
| 301 | * |
| 302 | * @param \WP_Post_Type $post_type Post type object. |
| 303 | * @return string |
| 304 | */ |
| 305 | private static function section_title( $post_type ) { |
| 306 | if ( 'page' === $post_type->name ) { |
| 307 | return __( 'Pages', 'jetpack-seo' ); |
| 308 | } |
| 309 | if ( 'post' === $post_type->name ) { |
| 310 | return __( 'Posts', 'jetpack-seo' ); |
| 311 | } |
| 312 | return wp_strip_all_tags( $post_type->label ); |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Render a list of posts as llms.txt link lines: |
| 317 | * `- [Title](url): summary`. |
| 318 | * |
| 319 | * @param \WP_Post[] $posts Posts to render. |
| 320 | * @return string Newline-joined link lines, or '' when there are none. |
| 321 | */ |
| 322 | private static function link_list( $posts ) { |
| 323 | $lines = array(); |
| 324 | foreach ( $posts as $post ) { |
| 325 | // Password-protected posts are `publish` status but their content is |
| 326 | // intentionally gated; keep them out of the public llms.txt entirely. |
| 327 | if ( ! empty( $post->post_password ) ) { |
| 328 | continue; |
| 329 | } |
| 330 | |
| 331 | // Collapse whitespace (incl. newlines) so each entry stays on one line. |
| 332 | $title = trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( get_the_title( $post ) ) ) ); |
| 333 | if ( '' === $title ) { |
| 334 | $title = __( '(untitled)', 'jetpack-seo' ); |
| 335 | } |
| 336 | // Escape brackets so a title can't break the `[title](url)` link syntax. |
| 337 | $title = str_replace( array( '[', ']' ), array( '\[', '\]' ), $title ); |
| 338 | $url = esc_url_raw( (string) get_permalink( $post ) ); |
| 339 | $line = '- [' . $title . '](' . $url . ')'; |
| 340 | |
| 341 | $summary = self::summary( $post ); |
| 342 | if ( '' !== $summary ) { |
| 343 | $line .= ': ' . $summary; |
| 344 | } |
| 345 | $lines[] = $line; |
| 346 | } |
| 347 | return implode( "\n", $lines ); |
| 348 | } |
| 349 | |
| 350 | /** |
| 351 | * A short, single-line summary for a post: its excerpt when set, otherwise a |
| 352 | * trimmed slice of the content. |
| 353 | * |
| 354 | * @param \WP_Post $post Post to summarize. |
| 355 | * @return string |
| 356 | */ |
| 357 | private static function summary( $post ) { |
| 358 | if ( has_excerpt( $post ) ) { |
| 359 | // A manual excerpt is a deliberate public summary; a body gate does not withhold it. |
| 360 | $raw = get_the_excerpt( $post ); |
| 361 | } elseif ( Content_Gate::is_gated( $post ) ) { |
| 362 | $teaser = Content_Gate::public_teaser( $post ); |
| 363 | if ( '' === $teaser ) { |
| 364 | return ''; |
| 365 | } |
| 366 | $raw = wp_trim_words( wp_strip_all_tags( strip_shortcodes( $teaser ) ), 30, '' ); |
| 367 | } else { |
| 368 | $raw = wp_trim_words( wp_strip_all_tags( strip_shortcodes( get_the_excerpt( $post ) ) ), 30, '' ); |
| 369 | } |
| 370 | |
| 371 | // Collapse whitespace so a link line stays on one row. |
| 372 | return trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( $raw ) ) ); |
| 373 | } |
| 374 | } |