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1 <?php 2 /** 3 * API for easily embedding rich media such as videos and images into content. 4 * 5 * @package WordPress 6 * @subpackage Embed 7 * @since 2.9.0 8 */ 9 #[AllowDynamicProperties] 10 class WP_Embed { 11 public $handlers = array(); 12 public $post_ID; 13 public $usecache = true; 14 public $linkifunknown = true; 15 public $last_attr = array(); 16 public $last_url = ''; 17 18 /** 19 * When a URL cannot be embedded, return false instead of returning a link 20 * or the URL. 21 * 22 * Bypasses the {@see 'embed_maybe_make_link'} filter. 23 * 24 * @var bool 25 */ 26 public $return_false_on_fail = false; 27 28 /** 29 * Constructor 30 */ 31 public function __construct() { 32 // Hack to get the [embed] shortcode to run before wpautop(). 33 add_filter( 'the_content', array( $this, 'run_shortcode' ), 8 ); 34 add_filter( 'widget_text_content', array( $this, 'run_shortcode' ), 8 ); 35 add_filter( 'widget_block_content', array( $this, 'run_shortcode' ), 8 ); 36 37 // Shortcode placeholder for strip_shortcodes(). 38 add_shortcode( 'embed', '__return_false' ); 39 40 // Attempts to embed all URLs in a post. 41 add_filter( 'the_content', array( $this, 'autoembed' ), 8 ); 42 add_filter( 'widget_text_content', array( $this, 'autoembed' ), 8 ); 43 add_filter( 'widget_block_content', array( $this, 'autoembed' ), 8 ); 44 45 // After a post is saved, cache oEmbed items via Ajax. 46 add_action( 'edit_form_advanced', array( $this, 'maybe_run_ajax_cache' ) ); 47 add_action( 'edit_page_form', array( $this, 'maybe_run_ajax_cache' ) ); 48 } 49 50 /** 51 * Processes the [embed] shortcode. 52 * 53 * Since the [embed] shortcode needs to be run earlier than other shortcodes, 54 * this function removes all existing shortcodes, registers the [embed] shortcode, 55 * calls do_shortcode(), and then re-registers the old shortcodes. 56 * 57 * @global array $shortcode_tags 58 * 59 * @param string $content Content to parse. 60 * @return string Content with shortcode parsed. 61 */ 62 public function run_shortcode( $content ) { 63 global $shortcode_tags; 64 65 // Back up current registered shortcodes and clear them all out. 66 $orig_shortcode_tags = $shortcode_tags; 67 remove_all_shortcodes(); 68 69 add_shortcode( 'embed', array( $this, 'shortcode' ) ); 70 71 // Do the shortcode (only the [embed] one is registered). 72 $content = do_shortcode( $content, true ); 73 74 // Put the original shortcodes back. 75 $shortcode_tags = $orig_shortcode_tags; 76 77 return $content; 78 } 79 80 /** 81 * If a post/page was saved, then output JavaScript to make 82 * an Ajax request that will call WP_Embed::cache_oembed(). 83 */ 84 public function maybe_run_ajax_cache() { 85 $post = get_post(); 86 87 if ( ! $post || empty( $_GET['message'] ) ) { 88 return; 89 } 90 ?> 91 <script type="text/javascript"> 92 jQuery( function($) { 93 $.get("<?php echo esc_url( admin_url( 'admin-ajax.php', 'relative' ) ) . '?action=oembed-cache&post=' . $post->ID; ?>"); 94 } ); 95 </script> 96 <?php 97 } 98 99 /** 100 * Registers an embed handler. 101 * 102 * Do not use this function directly, use wp_embed_register_handler() instead. 103 * 104 * This function should probably also only be used for sites that do not support oEmbed. 105 * 106 * @param string $id An internal ID/name for the handler. Needs to be unique. 107 * @param string $regex The regex that will be used to see if this handler should be used for a URL. 108 * @param callable $callback The callback function that will be called if the regex is matched. 109 * @param int $priority Optional. Used to specify the order in which the registered handlers will be tested. 110 * Lower numbers correspond with earlier testing, and handlers with the same priority are 111 * tested in the order in which they were added to the action. Default 10. 112 */ 113 public function register_handler( $id, $regex, $callback, $priority = 10 ) { 114 $this->handlers[ $priority ][ $id ] = array( 115 'regex' => $regex, 116 'callback' => $callback, 117 ); 118 } 119 120 /** 121 * Unregisters a previously-registered embed handler. 122 * 123 * Do not use this function directly, use wp_embed_unregister_handler() instead. 124 * 125 * @param string $id The handler ID that should be removed. 126 * @param int $priority Optional. The priority of the handler to be removed (default: 10). 127 */ 128 public function unregister_handler( $id, $priority = 10 ) { 129 unset( $this->handlers[ $priority ][ $id ] ); 130 } 131 132 /** 133 * Returns embed HTML for a given URL from embed handlers. 134 * 135 * Attempts to convert a URL into embed HTML by checking the URL 136 * against the regex of the registered embed handlers. 137 * 138 * @since 5.5.0 139 * 140 * @param array $attr { 141 * Shortcode attributes. Optional. 142 * 143 * @type int $width Width of the embed in pixels. 144 * @type int $height Height of the embed in pixels. 145 * } 146 * @param string $url The URL attempting to be embedded. 147 * @return string|false The embed HTML on success, false otherwise. 148 */ 149 public function get_embed_handler_html( $attr, $url ) { 150 $rawattr = $attr; 151 $attr = wp_parse_args( $attr, wp_embed_defaults( $url ) ); 152 153 ksort( $this->handlers ); 154 foreach ( $this->handlers as $priority => $handlers ) { 155 foreach ( $handlers as $id => $handler ) { 156 if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) { 157 $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ); 158 if ( false !== $return ) { 159 /** 160 * Filters the returned embed HTML. 161 * 162 * @since 2.9.0 163 * 164 * @see WP_Embed::shortcode() 165 * 166 * @param string|false $return The HTML result of the shortcode, or false on failure. 167 * @param string $url The embed URL. 168 * @param array $attr An array of shortcode attributes. 169 */ 170 return apply_filters( 'embed_handler_html', $return, $url, $attr ); 171 } 172 } 173 } 174 } 175 176 return false; 177 } 178 179 /** 180 * The do_shortcode() callback function. 181 * 182 * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of 183 * the registered embed handlers. If none of the regex matches and it's enabled, then the URL 184 * will be given to the WP_oEmbed class. 185 * 186 * @param array $attr { 187 * Shortcode attributes. Optional. 188 * 189 * @type int $width Width of the embed in pixels. 190 * @type int $height Height of the embed in pixels. 191 * } 192 * @param string $url The URL attempting to be embedded. 193 * @return string|false The embed HTML on success, otherwise the original URL. 194 * `->maybe_make_link()` can return false on failure. 195 */ 196 public function shortcode( $attr, $url = '' ) { 197 $post = get_post(); 198 199 if ( empty( $url ) && ! empty( $attr['src'] ) ) { 200 $url = $attr['src']; 201 } 202 203 $this->last_url = $url; 204 205 if ( empty( $url ) ) { 206 $this->last_attr = $attr; 207 return ''; 208 } 209 210 $rawattr = $attr; 211 $attr = wp_parse_args( $attr, wp_embed_defaults( $url ) ); 212 213 $this->last_attr = $attr; 214 215 /* 216 * KSES converts & into & and we need to undo this. 217 * See https://core.trac.wordpress.org/ticket/11311 218 */ 219 $url = str_replace( '&', '&', $url ); 220 221 // Look for known internal handlers. 222 $embed_handler_html = $this->get_embed_handler_html( $rawattr, $url ); 223 if ( false !== $embed_handler_html ) { 224 return $embed_handler_html; 225 } 226 227 $post_id = ( ! empty( $post->ID ) ) ? $post->ID : null; 228 229 // Potentially set by WP_Embed::cache_oembed(). 230 if ( ! empty( $this->post_ID ) ) { 231 $post_id = $this->post_ID; 232 } 233 234 // Check for a cached result (stored as custom post or in the post meta). 235 $key_suffix = md5( $url . serialize( $attr ) ); 236 $cachekey = '_oembed_' . $key_suffix; 237 $cachekey_time = '_oembed_time_' . $key_suffix; 238 239 /** 240 * Filters the oEmbed TTL value (time to live). 241 * 242 * @since 4.0.0 243 * 244 * @param int $time Time to live (in seconds). 245 * @param string $url The attempted embed URL. 246 * @param array $attr An array of shortcode attributes. 247 * @param int $post_id Post ID. 248 */ 249 $ttl = apply_filters( 'oembed_ttl', DAY_IN_SECONDS, $url, $attr, $post_id ); 250 251 $cache = ''; 252 $cache_time = 0; 253 254 $cached_post_id = $this->find_oembed_post_id( $key_suffix ); 255 256 if ( $post_id ) { 257 $cache = get_post_meta( $post_id, $cachekey, true ); 258 $cache_time = get_post_meta( $post_id, $cachekey_time, true ); 259 260 if ( ! $cache_time ) { 261 $cache_time = 0; 262 } 263 } elseif ( $cached_post_id ) { 264 $cached_post = get_post( $cached_post_id ); 265 266 $cache = $cached_post->post_content; 267 $cache_time = strtotime( $cached_post->post_modified_gmt ); 268 } 269 270 $cached_recently = ( time() - $cache_time ) < $ttl; 271 272 if ( $this->usecache || $cached_recently ) { 273 // Failures are cached. Serve one if we're using the cache. 274 if ( '{{unknown}}' === $cache ) { 275 return $this->maybe_make_link( $url ); 276 } 277 278 if ( ! empty( $cache ) ) { 279 /** 280 * Filters the cached oEmbed HTML. 281 * 282 * @since 2.9.0 283 * 284 * @see WP_Embed::shortcode() 285 * 286 * @param string|false $cache The cached HTML result, stored in post meta. 287 * @param string $url The attempted embed URL. 288 * @param array $attr An array of shortcode attributes. 289 * @param int $post_id Post ID. 290 */ 291 return apply_filters( 'embed_oembed_html', $cache, $url, $attr, $post_id ); 292 } 293 } 294 295 /** 296 * Filters whether to inspect the given URL for discoverable link tags. 297 * 298 * @since 2.9.0 299 * @since 4.4.0 The default value changed to true. 300 * 301 * @see WP_oEmbed::discover() 302 * 303 * @param bool $enable Whether to enable `<link>` tag discovery. Default true. 304 */ 305 $attr['discover'] = apply_filters( 'embed_oembed_discover', true ); 306 307 // Use oEmbed to get the HTML. 308 $html = wp_oembed_get( $url, $attr ); 309 310 if ( $post_id ) { 311 if ( $html ) { 312 update_post_meta( $post_id, $cachekey, $html ); 313 update_post_meta( $post_id, $cachekey_time, time() ); 314 } elseif ( ! $cache ) { 315 update_post_meta( $post_id, $cachekey, '{{unknown}}' ); 316 } 317 } else { 318 $has_kses = false !== has_filter( 'content_save_pre', 'wp_filter_post_kses' ); 319 320 if ( $has_kses ) { 321 // Prevent KSES from corrupting JSON in post_content. 322 kses_remove_filters(); 323 } 324 325 $insert_post_args = array( 326 'post_name' => $key_suffix, 327 'post_status' => 'publish', 328 'post_type' => 'oembed_cache', 329 ); 330 331 if ( $html ) { 332 if ( $cached_post_id ) { 333 wp_update_post( 334 wp_slash( 335 array( 336 'ID' => $cached_post_id, 337 'post_content' => $html, 338 ) 339 ) 340 ); 341 } else { 342 wp_insert_post( 343 wp_slash( 344 array_merge( 345 $insert_post_args, 346 array( 347 'post_content' => $html, 348 ) 349 ) 350 ) 351 ); 352 } 353 } elseif ( ! $cache ) { 354 wp_insert_post( 355 wp_slash( 356 array_merge( 357 $insert_post_args, 358 array( 359 'post_content' => '{{unknown}}', 360 ) 361 ) 362 ) 363 ); 364 } 365 366 if ( $has_kses ) { 367 kses_init_filters(); 368 } 369 } 370 371 // If there was a result, return it. 372 if ( $html ) { 373 /** This filter is documented in wp-includes/class-wp-embed.php */ 374 return apply_filters( 'embed_oembed_html', $html, $url, $attr, $post_id ); 375 } 376 377 // Still unknown. 378 return $this->maybe_make_link( $url ); 379 } 380 381 /** 382 * Deletes all oEmbed caches. Unused by core as of 4.0.0. 383 * 384 * @param int $post_id Post ID to delete the caches for. 385 */ 386 public function delete_oembed_caches( $post_id ) { 387 $post_metas = get_post_custom_keys( $post_id ); 388 if ( empty( $post_metas ) ) { 389 return; 390 } 391 392 foreach ( $post_metas as $post_meta_key ) { 393 if ( str_starts_with( $post_meta_key, '_oembed_' ) ) { 394 delete_post_meta( $post_id, $post_meta_key ); 395 } 396 } 397 } 398 399 /** 400 * Triggers a caching of all oEmbed results. 401 * 402 * @param int $post_id Post ID to do the caching for. 403 */ 404 public function cache_oembed( $post_id ) { 405 $post = get_post( $post_id ); 406 407 $post_types = get_post_types( array( 'show_ui' => true ) ); 408 409 /** 410 * Filters the array of post types to cache oEmbed results for. 411 * 412 * @since 2.9.0 413 * 414 * @param string[] $post_types Array of post type names to cache oEmbed results for. Defaults to post types with `show_ui` set to true. 415 */ 416 $cache_oembed_types = apply_filters( 'embed_cache_oembed_types', $post_types ); 417 418 if ( empty( $post->ID ) || ! in_array( $post->post_type, $cache_oembed_types, true ) ) { 419 return; 420 } 421 422 // Trigger a caching. 423 if ( ! empty( $post->post_content ) ) { 424 $this->post_ID = $post->ID; 425 $this->usecache = false; 426 427 $content = $this->run_shortcode( $post->post_content ); 428 $this->autoembed( $content ); 429 430 $this->usecache = true; 431 } 432 } 433 434 /** 435 * Passes any unlinked URLs that are on their own line to WP_Embed::shortcode() for potential embedding. 436 * 437 * @see WP_Embed::autoembed_callback() 438 * 439 * @param string $content The content to be searched. 440 * @return string Potentially modified $content. 441 */ 442 public function autoembed( $content ) { 443 // Replace line breaks from all HTML elements with placeholders. 444 $content = wp_replace_in_html_tags( $content, array( "\n" => '<!-- wp-line-break -->' ) ); 445 446 if ( preg_match( '#(^|\s|>)https?://#i', $content ) ) { 447 // Find URLs on their own line. 448 $content = preg_replace_callback( '|^(\s*)(https?://[^\s<>"]+)(\s*)$|im', array( $this, 'autoembed_callback' ), $content ); 449 // Find URLs in their own paragraph. 450 $content = preg_replace_callback( '|(<p(?: [^>]*)?>\s*)(https?://[^\s<>"]+)(\s*<\/p>)|i', array( $this, 'autoembed_callback' ), $content ); 451 } 452 453 // Put the line breaks back. 454 return str_replace( '<!-- wp-line-break -->', "\n", $content ); 455 } 456 457 /** 458 * Callback function for WP_Embed::autoembed(). 459 * 460 * @param array $matches A regex match array. 461 * @return string The embed HTML on success, otherwise the original URL. 462 */ 463 public function autoembed_callback( $matches ) { 464 $oldval = $this->linkifunknown; 465 $this->linkifunknown = false; 466 $return = $this->shortcode( array(), $matches[2] ); 467 $this->linkifunknown = $oldval; 468 469 return $matches[1] . $return . $matches[3]; 470 } 471 472 /** 473 * Conditionally makes a hyperlink based on an internal class variable. 474 * 475 * @param string $url URL to potentially be linked. 476 * @return string|false Linked URL or the original URL. False if 'return_false_on_fail' is true. 477 */ 478 public function maybe_make_link( $url ) { 479 if ( $this->return_false_on_fail ) { 480 return false; 481 } 482 483 $output = ( $this->linkifunknown ) ? '<a href="' . esc_url( $url ) . '">' . esc_html( $url ) . '</a>' : $url; 484 485 /** 486 * Filters the returned, maybe-linked embed URL. 487 * 488 * @since 2.9.0 489 * 490 * @param string $output The linked or original URL. 491 * @param string $url The original URL. 492 */ 493 return apply_filters( 'embed_maybe_make_link', $output, $url ); 494 } 495 496 /** 497 * Finds the oEmbed cache post ID for a given cache key. 498 * 499 * @since 4.9.0 500 * 501 * @param string $cache_key oEmbed cache key. 502 * @return int|null Post ID on success, null on failure. 503 */ 504 public function find_oembed_post_id( $cache_key ) { 505 $cache_group = 'oembed_cache_post'; 506 $oembed_post_id = wp_cache_get( $cache_key, $cache_group ); 507 508 if ( $oembed_post_id && 'oembed_cache' === get_post_type( $oembed_post_id ) ) { 509 return $oembed_post_id; 510 } 511 512 $oembed_post_query = new WP_Query( 513 array( 514 'post_type' => 'oembed_cache', 515 'post_status' => 'publish', 516 'name' => $cache_key, 517 'posts_per_page' => 1, 518 'no_found_rows' => true, 519 'cache_results' => true, 520 'update_post_meta_cache' => false, 521 'update_post_term_cache' => false, 522 'lazy_load_term_meta' => false, 523 ) 524 ); 525 526 if ( ! empty( $oembed_post_query->posts ) ) { 527 // Note: 'fields' => 'ids' is not being used in order to cache the post object as it will be needed. 528 $oembed_post_id = $oembed_post_query->posts[0]->ID; 529 wp_cache_set( $cache_key, $oembed_post_id, $cache_group ); 530 531 return $oembed_post_id; 532 } 533 534 return null; 535 } 536 }
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