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| 1 | <?php |
| 2 | /** |
| 3 | * Jetpack Reader Chat — Agents Manager CDN loader for blog readers. |
| 4 | * |
| 5 | * Loads a self-contained reader-chat bundle from the widgets.wp.com CDN |
| 6 | * and renders a floating chat UI on singular posts for logged-out visitors. |
| 7 | * |
| 8 | * The reader-chat bundle inlines all WP dependencies (built without |
| 9 | * DependencyExtractionWebpackPlugin) so it works on the frontend |
| 10 | * without WordPress's script loader. |
| 11 | * |
| 12 | * Enable via filter: |
| 13 | * add_filter( 'jetpack_reader_chat_enabled', '__return_true' ); |
| 14 | * |
| 15 | * @package automattic/jetpack |
| 16 | */ |
| 17 | |
| 18 | namespace Automattic\Jetpack\Extensions\AiAssistantPlugin; |
| 19 | |
| 20 | use Automattic\Jetpack\Connection\Manager as Connection_Manager; |
| 21 | use Automattic\Jetpack\Search\Plan; |
| 22 | use Automattic\Jetpack\Status; |
| 23 | use Automattic\Jetpack\Status\Host; |
| 24 | use Jetpack_Options; |
| 25 | |
| 26 | const READER_CHAT_JS_URL = 'https://widgets.wp.com/agents-manager/reader-chat.min.js'; |
| 27 | const READER_CHAT_ASSET_TRANSIENT = 'jetpack_reader_chat_asset'; |
| 28 | const READER_CHAT_ASSET_FAILURE_CACHE_TTL = 5 * MINUTE_IN_SECONDS; |
| 29 | |
| 30 | /** |
| 31 | * Handles loading the reader chat UI on the frontend. |
| 32 | */ |
| 33 | class Jetpack_Reader_Chat { |
| 34 | |
| 35 | /** |
| 36 | * Initialize hooks. |
| 37 | * |
| 38 | * @return void |
| 39 | */ |
| 40 | public static function init(): void { |
| 41 | // Register the setting unconditionally so the Search REST endpoint can |
| 42 | // flip it even when the feature is currently disabled. |
| 43 | add_action( 'init', array( __CLASS__, 'register_settings' ) ); |
| 44 | add_filter( 'jetpack_sync_options_whitelist', array( __CLASS__, 'add_sync_options_whitelist' ) ); |
| 45 | |
| 46 | /** |
| 47 | * Filter to enable or disable the Jetpack Reader Chat feature. |
| 48 | * |
| 49 | * Defaults to the value of the reader_chat site option (false when |
| 50 | * unset). Override programmatically with: |
| 51 | * add_filter( 'jetpack_reader_chat_enabled', '__return_true' ); |
| 52 | * |
| 53 | * @since 15.9 |
| 54 | * |
| 55 | * @param bool $enabled Whether the reader chat is enabled. |
| 56 | */ |
| 57 | if ( ! apply_filters( 'jetpack_reader_chat_enabled', (bool) get_option( 'reader_chat', false ) ) ) { |
| 58 | return; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Filter whether Reader Chat should hook its public frontend loader. |
| 63 | * |
| 64 | * @since 15.9 |
| 65 | * |
| 66 | * @param bool $enabled Whether the reader chat frontend loader should be hooked. |
| 67 | */ |
| 68 | if ( ! apply_filters( 'jetpack_reader_chat_enqueue_enabled', true ) ) { |
| 69 | return; |
| 70 | } |
| 71 | |
| 72 | add_action( 'wp_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) ); |
| 73 | add_action( 'wp_footer', array( __CLASS__, 'render_mount_div' ) ); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Register the reader_chat option so Search settings can read and write it. |
| 78 | * |
| 79 | * @since 15.9 |
| 80 | * |
| 81 | * @return void |
| 82 | */ |
| 83 | public static function register_settings(): void { |
| 84 | register_setting( |
| 85 | 'general', |
| 86 | 'reader_chat', |
| 87 | array( |
| 88 | 'type' => 'boolean', |
| 89 | 'description' => __( 'Whether Reader Chat is enabled on this site.', 'jetpack' ), |
| 90 | 'sanitize_callback' => 'rest_sanitize_boolean', |
| 91 | 'default' => false, |
| 92 | ) |
| 93 | ); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Add Reader Chat's setting to Jetpack Sync's option whitelist. |
| 98 | * |
| 99 | * Atomic and Jurassic Ninja sites write `reader_chat` locally via |
| 100 | * Search settings, while the wpcom-hosted agent reads the wpcom-side option |
| 101 | * before serving public chat requests. Syncing the option keeps |
| 102 | * the local toggle and agent permission gate aligned. |
| 103 | * |
| 104 | * @since 15.9 |
| 105 | * |
| 106 | * @param array $options Option names allowed to sync. |
| 107 | * @return array Updated option names. |
| 108 | */ |
| 109 | public static function add_sync_options_whitelist( array $options ): array { |
| 110 | $options[] = 'reader_chat'; |
| 111 | return array_values( array_unique( $options ) ); |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Enqueue the reader chat script on the frontend. |
| 116 | * |
| 117 | * Loads on every public-facing page (home, archives, pages, singular |
| 118 | * posts). Skips admin, feeds, and AJAX to keep the bundle off contexts |
| 119 | * where the chat UI doesn't belong. currentPost in the config is only |
| 120 | * populated on singular views — stream views get general suggestions. |
| 121 | * |
| 122 | * @return void |
| 123 | */ |
| 124 | public static function enqueue_scripts(): void { |
| 125 | if ( is_admin() || is_feed() || wp_doing_ajax() ) { |
| 126 | return; |
| 127 | } |
| 128 | |
| 129 | if ( self::is_site_coming_soon_or_unlaunched() ) { |
| 130 | return; |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Filter to override the AI features check. |
| 135 | * |
| 136 | * Set to true to load reader chat regardless of Jetpack connection |
| 137 | * status, or false to force-disable. Defaults to null, meaning use |
| 138 | * the built-in check. Useful for testing on dev sites. |
| 139 | * |
| 140 | * @param bool|null $override null = use default check, true/false = override. |
| 141 | */ |
| 142 | $has_features = apply_filters( 'jetpack_reader_chat_has_ai_features', null ); |
| 143 | if ( ! ( $has_features ?? self::has_ai_features() ) ) { |
| 144 | return; |
| 145 | } |
| 146 | |
| 147 | if ( ! self::has_search_plan_access() ) { |
| 148 | return; |
| 149 | } |
| 150 | |
| 151 | $version = self::get_asset_version(); |
| 152 | |
| 153 | // The reader-chat bundle is self-contained — no WP script dependencies. |
| 154 | wp_enqueue_script( |
| 155 | 'jetpack-reader-chat', |
| 156 | READER_CHAT_JS_URL, |
| 157 | array(), |
| 158 | $version, |
| 159 | true |
| 160 | ); |
| 161 | |
| 162 | wp_enqueue_style( |
| 163 | 'jetpack-reader-chat', |
| 164 | 'https://widgets.wp.com/agents-manager/reader-chat.css', |
| 165 | array(), |
| 166 | $version |
| 167 | ); |
| 168 | |
| 169 | // Inject config for the JS bundle (before the script tag). |
| 170 | wp_add_inline_script( |
| 171 | 'jetpack-reader-chat', |
| 172 | 'window.JetpackReaderChatConfig = ' . wp_json_encode( |
| 173 | self::get_reader_chat_config(), |
| 174 | JSON_UNESCAPED_SLASHES | JSON_HEX_TAG | JSON_HEX_AMP |
| 175 | ) . ';', |
| 176 | 'before' |
| 177 | ); |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * Check whether the current site is Coming Soon or unlaunched. |
| 182 | * |
| 183 | * Reader Chat is a public frontend widget, so it should not mount on sites |
| 184 | * that are still hidden behind launch or Coming Soon visibility. |
| 185 | * |
| 186 | * @return bool Whether the site is hidden by launch or Coming Soon visibility. |
| 187 | */ |
| 188 | private static function is_site_coming_soon_or_unlaunched(): bool { |
| 189 | $status = new Status(); |
| 190 | if ( $status->is_coming_soon() ) { |
| 191 | return true; |
| 192 | } |
| 193 | |
| 194 | return 'unlaunched' === get_option( 'launch-status' ); |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Render the mount div in the footer. |
| 199 | * |
| 200 | * Only outputs the div when the script was successfully enqueued. |
| 201 | * |
| 202 | * @return void |
| 203 | */ |
| 204 | public static function render_mount_div(): void { |
| 205 | if ( ! wp_script_is( 'jetpack-reader-chat' ) ) { |
| 206 | return; |
| 207 | } |
| 208 | |
| 209 | echo '<div id="jetpack-reader-chat"></div>'; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Build the config object for the reader chat JS bundle. |
| 214 | * |
| 215 | * @return array The config array for JSON encoding. |
| 216 | */ |
| 217 | private static function get_reader_chat_config(): array { |
| 218 | $host = new Host(); |
| 219 | if ( $host->is_wpcom_simple() ) { |
| 220 | $site_id = get_current_blog_id(); |
| 221 | } else { |
| 222 | $site_id = (int) Jetpack_Options::get_option( 'id' ); |
| 223 | } |
| 224 | |
| 225 | $config = array( |
| 226 | 'siteId' => $site_id, |
| 227 | 'siteUrl' => home_url(), |
| 228 | 'siteName' => get_bloginfo( 'name' ), |
| 229 | 'isDevMode' => self::is_dev_mode(), |
| 230 | 'agentId' => 'reader-chat', |
| 231 | ); |
| 232 | |
| 233 | $current_post = self::get_current_post_context(); |
| 234 | if ( null !== $current_post ) { |
| 235 | $config['currentPost'] = $current_post; |
| 236 | } |
| 237 | |
| 238 | return $config; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Build the current post context for the reader chat config. |
| 243 | * |
| 244 | * Returns null on non-singular views or when no post is available. |
| 245 | * |
| 246 | * @return array|null Post context, or null when not on a singular view. |
| 247 | */ |
| 248 | private static function get_current_post_context(): ?array { |
| 249 | if ( ! is_singular() ) { |
| 250 | return null; |
| 251 | } |
| 252 | |
| 253 | $post = get_post(); |
| 254 | if ( ! $post ) { |
| 255 | return null; |
| 256 | } |
| 257 | |
| 258 | // Only expose current post context for content that is publicly |
| 259 | // viewable. Draft/private/future/trash posts can be visible to |
| 260 | // editors through previews, but reader chat is public-facing and |
| 261 | // should not receive non-public post content in its inline config. |
| 262 | if ( is_preview() || ! is_post_publicly_viewable( $post ) ) { |
| 263 | return null; |
| 264 | } |
| 265 | |
| 266 | // Respect password-protected posts: do not leak body content to |
| 267 | // visitors who have not entered the password. Omit the whole |
| 268 | // currentPost envelope so the chat doesn't imply it "knows" the |
| 269 | // post's content either. |
| 270 | if ( post_password_required( $post ) ) { |
| 271 | return null; |
| 272 | } |
| 273 | |
| 274 | $context = array( |
| 275 | 'id' => $post->ID, |
| 276 | 'title' => get_the_title( $post ), |
| 277 | 'url' => get_permalink( $post ), |
| 278 | 'excerpt' => wp_trim_words( wp_strip_all_tags( $post->post_content ), 120 ), |
| 279 | 'author' => get_the_author_meta( 'display_name', (int) $post->post_author ), |
| 280 | 'date' => get_the_date( 'F j, Y', $post ), |
| 281 | ); |
| 282 | |
| 283 | $categories = get_the_category( $post->ID ); |
| 284 | if ( $categories ) { |
| 285 | $context['categories'] = wp_list_pluck( $categories, 'name' ); |
| 286 | } |
| 287 | |
| 288 | $tags = get_the_tags( $post->ID ); |
| 289 | if ( $tags ) { |
| 290 | $context['tags'] = wp_list_pluck( $tags, 'name' ); |
| 291 | } |
| 292 | |
| 293 | return $context; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Get the version string for the CDN bundle. |
| 298 | * |
| 299 | * Attempts to read the version from the remote asset manifest. |
| 300 | * Falls back to a timestamp in dev mode, or null in production. |
| 301 | * |
| 302 | * @return string|false|null The version string, or null to omit the query param. |
| 303 | */ |
| 304 | private static function get_asset_version() { |
| 305 | $skip_cache = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG; |
| 306 | |
| 307 | if ( ! $skip_cache ) { |
| 308 | $cached = get_transient( READER_CHAT_ASSET_TRANSIENT ); |
| 309 | if ( false !== $cached ) { |
| 310 | return $cached['version'] ?? null; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | $json_path = 'widgets.wp.com/agents-manager/reader-chat.asset.json'; |
| 315 | |
| 316 | // Try local filesystem first (available on WordPress.com). |
| 317 | $data = self::read_local_asset_json( ABSPATH . $json_path ); |
| 318 | |
| 319 | // Fallback to HTTP fetch. |
| 320 | if ( false === $data ) { |
| 321 | $data = self::fetch_remote_asset_json( 'https://' . $json_path ); |
| 322 | } |
| 323 | |
| 324 | if ( false === $data ) { |
| 325 | // Dev mode: return a cache-busting version so the sandbox bundle loads. |
| 326 | if ( self::is_dev_mode() ) { |
| 327 | return 'dev-' . time(); |
| 328 | } |
| 329 | if ( ! $skip_cache ) { |
| 330 | set_transient( |
| 331 | READER_CHAT_ASSET_TRANSIENT, |
| 332 | array( |
| 333 | 'version' => null, |
| 334 | ), |
| 335 | READER_CHAT_ASSET_FAILURE_CACHE_TTL |
| 336 | ); |
| 337 | } |
| 338 | return null; |
| 339 | } |
| 340 | |
| 341 | if ( ! $skip_cache ) { |
| 342 | set_transient( READER_CHAT_ASSET_TRANSIENT, $data, HOUR_IN_SECONDS ); |
| 343 | } |
| 344 | |
| 345 | return $data['version'] ?? null; |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Read and decode a local asset manifest JSON file. |
| 350 | * |
| 351 | * @param string $path Absolute filesystem path to the JSON file. |
| 352 | * @return array|false Decoded data or false on failure. |
| 353 | */ |
| 354 | private static function read_local_asset_json( string $path ) { |
| 355 | if ( ! file_exists( $path ) ) { |
| 356 | return false; |
| 357 | } |
| 358 | |
| 359 | // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents -- Local file, not remote URL. |
| 360 | $contents = file_get_contents( $path ); |
| 361 | if ( false === $contents ) { |
| 362 | return false; |
| 363 | } |
| 364 | |
| 365 | return self::decode_asset_json( $contents ); |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Fetch and decode a remote asset manifest JSON file. |
| 370 | * |
| 371 | * @param string $url URL to fetch. |
| 372 | * @return array|false Decoded data or false on failure. |
| 373 | */ |
| 374 | private static function fetch_remote_asset_json( string $url ) { |
| 375 | $response = wp_safe_remote_get( $url ); |
| 376 | if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) { |
| 377 | return false; |
| 378 | } |
| 379 | |
| 380 | return self::decode_asset_json( wp_remote_retrieve_body( $response ) ); |
| 381 | } |
| 382 | |
| 383 | /** |
| 384 | * Decode a JSON asset manifest string and validate the result is an array. |
| 385 | * |
| 386 | * @param string $contents Raw JSON string. |
| 387 | * @return array|false Decoded array or false on decode failure / non-array. |
| 388 | */ |
| 389 | private static function decode_asset_json( string $contents ) { |
| 390 | $data = json_decode( $contents, true ); |
| 391 | if ( JSON_ERROR_NONE !== json_last_error() || ! is_array( $data ) ) { |
| 392 | return false; |
| 393 | } |
| 394 | return $data; |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * Check whether AI features are available for this site. |
| 399 | * |
| 400 | * @return bool |
| 401 | */ |
| 402 | private static function has_ai_features(): bool { |
| 403 | $host = new Host(); |
| 404 | |
| 405 | if ( $host->is_wpcom_simple() ) { |
| 406 | return true; |
| 407 | } |
| 408 | |
| 409 | return ( new Connection_Manager( 'jetpack' ) )->has_connected_owner() |
| 410 | && ! ( new Status() )->is_offline_mode() |
| 411 | && apply_filters( 'jetpack_ai_enabled', true ); |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * Check whether the current site can serve Reader Chat under its Search plan. |
| 416 | * |
| 417 | * Uses WordPress.com's local Search plan source on Simple sites. Elsewhere, |
| 418 | * uses the cached Jetpack Search plan option instead of forcing a remote |
| 419 | * refresh on public frontend requests. |
| 420 | * |
| 421 | * @return bool |
| 422 | */ |
| 423 | private static function has_search_plan_access(): bool { |
| 424 | $plan_access = apply_filters( 'jetpack_reader_chat_has_search_plan_access', null ); |
| 425 | if ( null !== $plan_access ) { |
| 426 | return (bool) $plan_access; |
| 427 | } |
| 428 | |
| 429 | $host = new Host(); |
| 430 | if ( $host->is_wpcom_simple() ) { |
| 431 | $blog_id = get_current_blog_id(); |
| 432 | if ( $blog_id <= 0 ) { |
| 433 | return false; |
| 434 | } |
| 435 | |
| 436 | if ( function_exists( 'require_lib' ) ) { |
| 437 | require_lib( 'jetpack-search' ); |
| 438 | } |
| 439 | |
| 440 | $wpcom_plan_info_class = '\Jetpack\Search\Plan_Info'; |
| 441 | if ( class_exists( $wpcom_plan_info_class ) ) { |
| 442 | $plan_info = new $wpcom_plan_info_class( $blog_id ); |
| 443 | return $plan_info->supports_search() && ! $plan_info->is_disabled_due_to_overage(); |
| 444 | } |
| 445 | } |
| 446 | |
| 447 | if ( ! class_exists( Plan::class ) ) { |
| 448 | return false; |
| 449 | } |
| 450 | |
| 451 | $plan_info = get_option( Plan::JETPACK_SEARCH_PLAN_INFO_OPTION_KEY ); |
| 452 | if ( ! is_array( $plan_info ) ) { |
| 453 | return false; |
| 454 | } |
| 455 | |
| 456 | return ! empty( $plan_info['supports_search'] ) |
| 457 | && empty( $plan_info['plan_usage']['must_upgrade'] ); |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * Check if the current request is from a development environment. |
| 462 | * |
| 463 | * Matches the pattern used in Jetpack_AI_Sidebar::is_dev_mode(). |
| 464 | * IMPORTANT: Only use for feature gating, not authorization. |
| 465 | * |
| 466 | * @return bool |
| 467 | */ |
| 468 | private static function is_dev_mode(): bool { |
| 469 | $domain = wp_parse_url( get_site_url(), PHP_URL_HOST ); |
| 470 | if ( ! is_string( $domain ) ) { |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | if ( |
| 475 | 'localhost' === $domain || |
| 476 | '.jurassic.tube' === stristr( $domain, '.jurassic.tube' ) || |
| 477 | '.jurassic.ninja' === stristr( $domain, '.jurassic.ninja' ) |
| 478 | ) { |
| 479 | return true; |
| 480 | } |
| 481 | |
| 482 | if ( function_exists( 'wpcom_is_proxied_request' ) && wpcom_is_proxied_request() ) { |
| 483 | return true; |
| 484 | } |
| 485 | |
| 486 | if ( |
| 487 | ( isset( $_SERVER['A8C_PROXIED_REQUEST'] ) && (bool) sanitize_text_field( wp_unslash( $_SERVER['A8C_PROXIED_REQUEST'] ) ) ) || |
| 488 | ( defined( 'A8C_PROXIED_REQUEST' ) && A8C_PROXIED_REQUEST ) |
| 489 | ) { |
| 490 | return true; |
| 491 | } |
| 492 | |
| 493 | if ( defined( 'AT_PROXIED_REQUEST' ) && AT_PROXIED_REQUEST && defined( 'ATOMIC_CLIENT_ID' ) ) { |
| 494 | switch ( ATOMIC_CLIENT_ID ) { |
| 495 | case 1: |
| 496 | case 2: |
| 497 | case 3: // Pressable |
| 498 | case 32: |
| 499 | case 118: // Commerce garden client (ciab) |
| 500 | return true; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | return false; |
| 505 | } |
| 506 | } |