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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 the |
| 8 | * existing `/jetpack/v4/settings` endpoint by the AI 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 pages and posts listed, so a large site doesn't dump its whole tree. |
| 38 | */ |
| 39 | const MAX_PAGES = 50; |
| 40 | const MAX_POSTS = 50; |
| 41 | |
| 42 | /** |
| 43 | * Wire the front-end request handler. |
| 44 | * |
| 45 | * @return void |
| 46 | */ |
| 47 | public static function init() { |
| 48 | add_action( 'template_redirect', array( __CLASS__, 'maybe_serve' ) ); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Whether llms.txt generation is currently switched on. |
| 53 | * |
| 54 | * @return bool |
| 55 | */ |
| 56 | public static function is_enabled() { |
| 57 | return (bool) get_option( self::OPTION, false ); |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Whether WordPress can actually serve the dynamic `/llms.txt` on this site. |
| 62 | * |
| 63 | * Two ways it can't, and the toggle then silently does nothing: |
| 64 | * - A physical `llms.txt` sits at the site root, so the web server delivers |
| 65 | * that file directly and WordPress never runs for the request. Detected |
| 66 | * here. |
| 67 | * - The host fronts WordPress for root-level paths (some managed hosts / |
| 68 | * static-file setups). PHP can't see that, so hosts can signal it via the |
| 69 | * `jetpack_seo_llms_txt_can_serve` filter. |
| 70 | * |
| 71 | * When this returns false the GEO tab shows an honest "can't take effect" |
| 72 | * notice instead of letting the admin believe the file is live. |
| 73 | * |
| 74 | * @return bool |
| 75 | */ |
| 76 | public static function can_serve() { |
| 77 | $has_static_file = defined( 'ABSPATH' ) && file_exists( ABSPATH . '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 0.1.0 |
| 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() ) { |
| 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, published pages, |
| 135 | * and recent posts. |
| 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 | $pages = self::link_list( |
| 151 | get_posts( |
| 152 | array( |
| 153 | 'post_type' => 'page', |
| 154 | 'post_status' => 'publish', |
| 155 | 'has_password' => false, |
| 156 | 'posts_per_page' => self::MAX_PAGES, |
| 157 | 'orderby' => 'menu_order title', |
| 158 | 'order' => 'ASC', |
| 159 | ) |
| 160 | ) |
| 161 | ); |
| 162 | if ( '' !== $pages ) { |
| 163 | $blocks[] = "## Pages\n\n" . $pages; |
| 164 | } |
| 165 | |
| 166 | $posts = self::link_list( |
| 167 | get_posts( |
| 168 | array( |
| 169 | 'post_type' => 'post', |
| 170 | 'post_status' => 'publish', |
| 171 | 'has_password' => false, |
| 172 | 'posts_per_page' => self::MAX_POSTS, |
| 173 | 'orderby' => 'date', |
| 174 | 'order' => 'DESC', |
| 175 | ) |
| 176 | ) |
| 177 | ); |
| 178 | if ( '' !== $posts ) { |
| 179 | $blocks[] = "## Posts\n\n" . $posts; |
| 180 | } |
| 181 | |
| 182 | return implode( "\n\n", $blocks ) . "\n"; |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Render a list of posts as llms.txt link lines: |
| 187 | * `- [Title](url): summary`. |
| 188 | * |
| 189 | * @param \WP_Post[] $posts Posts to render. |
| 190 | * @return string Newline-joined link lines, or '' when there are none. |
| 191 | */ |
| 192 | private static function link_list( $posts ) { |
| 193 | $lines = array(); |
| 194 | foreach ( $posts as $post ) { |
| 195 | // Password-protected posts are `publish` status but their content is |
| 196 | // intentionally gated; keep them out of the public llms.txt entirely. |
| 197 | if ( ! empty( $post->post_password ) ) { |
| 198 | continue; |
| 199 | } |
| 200 | |
| 201 | // Collapse whitespace (incl. newlines) so each entry stays on one line. |
| 202 | $title = trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( get_the_title( $post ) ) ) ); |
| 203 | if ( '' === $title ) { |
| 204 | $title = __( '(untitled)', 'jetpack-seo' ); |
| 205 | } |
| 206 | // Escape brackets so a title can't break the `[title](url)` link syntax. |
| 207 | $title = str_replace( array( '[', ']' ), array( '\[', '\]' ), $title ); |
| 208 | $url = esc_url_raw( (string) get_permalink( $post ) ); |
| 209 | $line = '- [' . $title . '](' . $url . ')'; |
| 210 | |
| 211 | $summary = self::summary( $post ); |
| 212 | if ( '' !== $summary ) { |
| 213 | $line .= ': ' . $summary; |
| 214 | } |
| 215 | $lines[] = $line; |
| 216 | } |
| 217 | return implode( "\n", $lines ); |
| 218 | } |
| 219 | |
| 220 | /** |
| 221 | * A short, single-line summary for a post: its excerpt when set, otherwise a |
| 222 | * trimmed slice of the content. |
| 223 | * |
| 224 | * @param \WP_Post $post Post to summarize. |
| 225 | * @return string |
| 226 | */ |
| 227 | private static function summary( $post ) { |
| 228 | $raw = has_excerpt( $post ) |
| 229 | ? get_the_excerpt( $post ) |
| 230 | : wp_trim_words( wp_strip_all_tags( strip_shortcodes( $post->post_content ) ), 30, '' ); |
| 231 | |
| 232 | // Collapse whitespace so a link line stays on one row. |
| 233 | return trim( preg_replace( '/\s+/', ' ', wp_strip_all_tags( $raw ) ) ); |
| 234 | } |
| 235 | } |