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