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<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName /** * Class with methods to extract metadata from a post/page about videos, images, links, mentions embedded * in or attached to the post/page. * * @package automattic/jetpack / /* * Class with methods to extract metadata from a post/page about videos, images, links, mentions embedded * in or attached to the post/page. * * @todo Additionally, have some filters on number of items in each field / class Jetpack_Media_Meta_Extractor { // Some consts for what to extract. const ALL = 255; const LINKS = 1; const MENTIONS = 2; const IMAGES = 4; const SHORTCODES = 8; // Only the keeper shortcodes below. const EMBEDS = 16; const HASHTAGS = 32; /* * Shortcodes to keep. * * For these, we try to extract some data from the shortcode, rather than just recording its presence (which we do for all) * There should be a function get_{shortcode}_id( $atts ) or static method SomethingShortcode::get_{shortcode}_id( $atts ) for these. * * @var string[] / private static $keeper_shortcodes = array( 'audio', 'youtube', 'vimeo', 'hulu', 'ted', 'video', 'wpvideo', 'videopress', ); /* * Gets the specified media and meta info from the given post. * NOTE: If you have the post's HTML content already and don't need image data, use extract_from_content() instead. * * @param int $blog_id The ID of the blog. * @param int $post_id The ID of the post. * @param int $what_to_extract A mask of things to extract, e.g. Jetpack_Media_Meta_Extractor::IMAGES \| Jetpack_Media_Meta_Extractor::MENTIONS. * @param boolean $extract_alt_text Should alt_text be extracted, defaults to false. * * @return array\|WP_Error a structure containing metadata about the embedded things, or empty array if nothing found, or WP_Error on error. / public static function extract( $blog_id, $post_id, $what_to_extract = self::ALL, $extract_alt_text = false ) { // multisite? if ( function_exists( 'switch_to_blog' ) ) { switch_to_blog( $blog_id ); } $post = get_post( $post_id ); if ( ! $post instanceof WP_Post ) { if ( function_exists( 'restore_current_blog' ) ) { restore_current_blog(); } return array(); } $content = $post->post_title . "\n\n" . $post->post_content; $char_cnt = strlen( $content ); // prevent running extraction on really huge amounts of content. if ( $char_cnt > 100000 ) { // about 20k English words. $content = substr( $content, 0, 100000 ); } $extracted = array(); // Get images first, we need the full post for that. if ( self::IMAGES & $what_to_extract ) { $extracted = self::get_image_fields( $post, array(), $extract_alt_text ); // Turn off images so we can safely call extract_from_content() below. $what_to_extract = $what_to_extract - self::IMAGES; } if ( function_exists( 'restore_current_blog' ) ) { restore_current_blog(); } // All of the other things besides images can be extracted from just the content. $extracted = self::extract_from_content( $content, $what_to_extract, $extracted ); return $extracted; } /* * Gets the specified meta info from the given post content. * NOTE: If you want IMAGES, call extract( $blog_id, $post_id, ...) which will give you more/better image extraction * This method will give you an error if you ask for IMAGES. * * @param string $content The HTML post_content of a post. * @param int $what_to_extract A mask of things to extract, e.g. Jetpack_Media_Meta_Extractor::IMAGES \| Jetpack_Media_Meta_Extractor::MENTIONS. * @param array $already_extracted Previously extracted things, e.g. images from extract(), which can be used for x-referencing here. * * @return array a structure containing metadata about the embedded things, or empty array if nothing found, or WP_Error on error. / public static function extract_from_content( $content, $what_to_extract = self::ALL, $already_extracted = array() ) { $stripped_content = self::get_stripped_content( $content ); // Maybe start with some previously extracted things (e.g. images from extract(). $extracted = $already_extracted; // Embedded media objects will have already been converted to shortcodes by pre_kses hooks on save. if ( self::IMAGES & $what_to_extract ) { $images = self::extract_images_from_content( $stripped_content, array() ); $extracted = array_merge( $extracted, $images ); } // ----------------------------------- MENTIONS ------------------------------ if ( self::MENTIONS & $what_to_extract ) { if ( preg_match_all( '/(^\|\s)@(\w+)/u', $stripped_content, $matches ) ) { $mentions = array_values( array_unique( $matches[2] ) ); // array_unique() retains the keys! $mentions = array_map( 'strtolower', $mentions ); $extracted['mention'] = array( 'name' => $mentions ); if ( ! isset( $extracted['has'] ) ) { $extracted['has'] = array(); } $extracted['has']['mention'] = count( $mentions ); } } // ----------------------------------- HASHTAGS ------------------------------ /* * Some hosts may not compile with --enable-unicode-properties and kick a warning: * Warning: preg_match_all() [function.preg-match-all]: Compilation failed: support for \P, \p, and \X has not been compiled * Therefore, we only run this code block on wpcom, not in Jetpack. / if ( ( defined( 'IS_WPCOM' ) && IS_WPCOM ) && ( self::HASHTAGS & $what_to_extract ) ) { // This regex does not exactly match Twitter's // if there are problems/complaints we should implement this: // https://github.com/twitter/twitter-text/blob/master/java/src/com/twitter/Regex.java . if ( preg_match_all( '/(?:^\|\s)#(\w\p{L}+\w)/u', $stripped_content, $matches ) ) { $hashtags = array_values( array_unique( $matches[1] ) ); // array_unique() retains the keys! $hashtags = array_map( 'strtolower', $hashtags ); $extracted['hashtag'] = array( 'name' => $hashtags ); if ( ! isset( $extracted['has'] ) ) { $extracted['has'] = array(); } $extracted['has']['hashtag'] = count( $hashtags ); } } // ----------------------------------- SHORTCODES ------------------------------ // Always look for shortcodes. // If we don't want them, we'll just remove them, so we don't grab them as links below. $shortcode_pattern = '/' . get_shortcode_regex() . '/s'; if ( preg_match_all( $shortcode_pattern, $content, $matches ) ) { $shortcode_total_count = 0; $shortcode_type_counts = array(); $shortcode_types = array(); $shortcode_details = array(); if ( self::SHORTCODES & $what_to_extract ) { foreach ( $matches[2] as $key => $shortcode ) { // Elasticsearch (and probably other things) doesn't deal well with some chars as key names. $shortcode_name = preg_replace( '/[.,"\'\/\\\\#+ ]/', '_', $shortcode ); $attr = shortcode_parse_atts( $matches[3][ $key ] ); ++$shortcode_total_count; if ( ! isset( $shortcode_type_counts[ $shortcode_name ] ) ) { $shortcode_type_counts[ $shortcode_name ] = 0; } ++$shortcode_type_counts[ $shortcode_name ]; // Store (uniquely) presence of all shortcode regardless of whether it's a keeper (for those, get ID below) // @todo Store number of occurrences? if ( ! in_array( $shortcode_name, $shortcode_types, true ) ) { $shortcode_types[] = $shortcode_name; } // For keeper shortcodes, also store the id/url of the object (e.g. youtube video, TED talk, etc.). if ( in_array( $shortcode, self::$keeper_shortcodes, true ) ) { // Clear shortcode ID data left from the last shortcode. $id = null; // We'll try to get the salient ID from the function jetpack_shortcode_get_xyz_id(). // If the shortcode is a class, we'll call XyzShortcode::get_xyz_id(). $shortcode_get_id_func = "jetpack_shortcode_get_{$shortcode}_id"; $shortcode_class_name = ucfirst( $shortcode ) . 'Shortcode'; $shortcode_get_id_method = "get_{$shortcode}_id"; if ( function_exists( $shortcode_get_id_func ) ) { $id = call_user_func( $shortcode_get_id_func, $attr ); } elseif ( method_exists( $shortcode_class_name, $shortcode_get_id_method ) ) { $id = call_user_func( array( $shortcode_class_name, $shortcode_get_id_method ), $attr ); } elseif ( 'video' === $shortcode ) { $id = $attr['src'] ?? $attr['url'] ?? $attr['mp4'] ?? $attr['m4v'] ?? $attr['webm'] ?? $attr['ogv'] ?? $attr['wmv'] ?? $attr['flv'] ?? null; } elseif ( 'audio' === $shortcode ) { preg_match( '#(https?://(?:[^\s"\|\']+)\.(?:mp3\|ogg\|flac\|m4a\|wav))([ "\'\|]\|$)#', implode( ' ', $attr ), $audio_matches ); $id = $audio_matches[1] ?? null; } if ( ! empty( $id ) && ( ! isset( $shortcode_details[ $shortcode_name ] ) \|\| ! in_array( $id, $shortcode_details[ $shortcode_name ], true ) ) ) { $shortcode_details[ $shortcode_name ][] = $id; } } } if ( $shortcode_total_count > 0 ) { // Add the shortcode info to the $extracted array. if ( ! isset( $extracted['has'] ) ) { $extracted['has'] = array(); } $extracted['has']['shortcode'] = $shortcode_total_count; $extracted['shortcode'] = array(); foreach ( $shortcode_type_counts as $type => $count ) { $extracted['shortcode'][ $type ] = array( 'count' => $count ); } if ( ! empty( $shortcode_types ) ) { $extracted['shortcode_types'] = $shortcode_types; } foreach ( $shortcode_details as $type => $id ) { $extracted['shortcode'][ $type ]['id'] = $id; } } } // Remove the shortcodes form our copy of $content, so we don't count links in them as links below. $content = preg_replace( $shortcode_pattern, ' ', $content ); } // ----------------------------------- LINKS ------------------------------ if ( self::LINKS & $what_to_extract ) { // To hold the extracted stuff we find. $links = array(); // @todo Get the text inside the links? // Grab any links, whether in <a href="..." or not, but subtract those from shortcodes and images. // (we treat embed links as just another link). if ( preg_match_all( '#(?:^\|\s\|"\|\')(https?://([^\s()<>]+(?:$[\w\d]+$\|([^[:punct:]\s]\|/))))#', $content, $matches ) ) { foreach ( $matches[1] as $link_raw ) { $url = wp_parse_url( $link_raw ); // Data URI links. if ( ! isset( $url['scheme'] ) \|\| 'data' === $url['scheme'] ) { continue; } // Reject invalid URLs. if ( ! isset( $url['host'] ) ) { continue; } // Remove large (and likely invalid) links. if ( 4096 < strlen( $link_raw ) ) { continue; } // Build a simple form of the URL so we can compare it to ones we found in IMAGES or SHORTCODES and exclude those. $simple_url = $url['scheme'] . '://' . $url['host'] . ( ! empty( $url['path'] ) ? $url['path'] : '' ); if ( isset( $extracted['image']['url'] ) ) { if ( in_array( $simple_url, (array) $extracted['image']['url'], true ) ) { continue; } } list( $proto, $link_all_but_proto ) = explode( '://', $link_raw ); // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable // Build a reversed hostname. $host_parts = array_reverse( explode( '.', $url['host'] ) ); $host_reversed = ''; foreach ( $host_parts as $part ) { $host_reversed .= ( ! empty( $host_reversed ) ? '.' : '' ) . $part; } $link_analyzed = ''; if ( ! empty( $url['path'] ) ) { // The whole path (no query args or fragments). $path = substr( $url['path'], 1 ); // strip the leading '/'. $link_analyzed .= ( ! empty( $link_analyzed ) ? ' ' : '' ) . $path; // The path split by /. $path_split = explode( '/', $path ); if ( count( $path_split ) > 1 ) { $link_analyzed .= ' ' . implode( ' ', $path_split ); } // The fragment. if ( ! empty( $url['fragment'] ) ) { $link_analyzed .= ( ! empty( $link_analyzed ) ? ' ' : '' ) . $url['fragment']; } } $link = array( 'url' => $link_all_but_proto, 'host_reversed' => $host_reversed, 'host' => $url['host'], ); if ( ! in_array( $link, $links, true ) ) { $links[] = $link; } } } $link_count = count( $links ); if ( $link_count ) { $extracted['link'] = $links; if ( ! isset( $extracted['has'] ) ) { $extracted['has'] = array(); } $extracted['has']['link'] = $link_count; } } // ----------------------------------- EMBEDS ------------------------------ // Embeds are just individual links on their own line. if ( self::EMBEDS & $what_to_extract ) { if ( ! function_exists( '_wp_oembed_get_object' ) ) { include ABSPATH . WPINC . '/class-oembed.php'; } // get an oembed object. $oembed = _wp_oembed_get_object(); // Grab any links on their own lines that may be embeds. if ( preg_match_all( '\|^\s(https?://[^\s"]+)\s$\|im', $content, $matches ) ) { // To hold the extracted stuff we find. $embeds = array(); foreach ( $matches[1] as $link_raw ) { $url = wp_parse_url( $link_raw ); list( $proto, $link_all_but_proto ) = explode( '://', $link_raw ); // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable // Check whether this "link" is really an embed. foreach ( $oembed->providers as $matchmask => $data ) { list( $providerurl, $regex ) = $data; // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable // Turn the asterisk-type provider URLs into regex. if ( ! $regex ) { $matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '', '___wildcard___', $matchmask ), '#' ) ) . '#i'; $matchmask = preg_replace( '\|^#http\\\://\|', '#https?\://', $matchmask ); } if ( preg_match( $matchmask, $link_raw ) ) { $embeds[] = $link_all_but_proto; // @todo Check unique before adding // @todo Try to get ID's for the ones we care about (shortcode_keepers) break; } } } if ( ! empty( $embeds ) ) { if ( ! isset( $extracted['has'] ) ) { $extracted['has'] = array(); } $extracted['has']['embed'] = count( $embeds ); $extracted['embed'] = array( 'url' => array() ); foreach ( $embeds as $e ) { $extracted['embed']['url'][] = $e; } } } } return $extracted; } /* * Get image fields for matching images. * * @uses Jetpack_PostImages * * @param WP_Post $post A post object. * @param array $args Optional args, see defaults list for details. * @param boolean $extract_alt_text Should alt_text be extracted, defaults to false. * * @return array Returns an array of all images meeting the specified criteria in $args. / private static function get_image_fields( $post, $args = array(), $extract_alt_text = false ) { if ( ! $post instanceof WP_Post ) { return array(); } $defaults = array( 'width' => 200, // Required minimum width (if possible to determine). 'height' => 200, // Required minimum height (if possible to determine). ); $args = wp_parse_args( $args, $defaults ); $image_list = array(); $image_booleans = array(); $image_booleans['gallery'] = 0; $from_featured_image = Jetpack_PostImages::from_thumbnail( $post->ID, $args['width'], $args['height'] ); if ( ! empty( $from_featured_image ) ) { if ( $extract_alt_text ) { $image_list = array_merge( $image_list, self::reduce_extracted_images( $from_featured_image ) ); } else { $srcs = wp_list_pluck( $from_featured_image, 'src' ); $image_list = array_merge( $image_list, $srcs ); } } $from_slideshow = Jetpack_PostImages::from_slideshow( $post->ID, $args['width'], $args['height'] ); if ( ! empty( $from_slideshow ) ) { if ( $extract_alt_text ) { $image_list = array_merge( $image_list, self::reduce_extracted_images( $from_slideshow ) ); } else { $srcs = wp_list_pluck( $from_slideshow, 'src' ); $image_list = array_merge( $image_list, $srcs ); } } $from_gallery = Jetpack_PostImages::from_gallery( $post->ID ); if ( ! empty( $from_gallery ) ) { if ( $extract_alt_text ) { $image_list = array_merge( $image_list, self::reduce_extracted_images( $from_gallery ) ); } else { $srcs = wp_list_pluck( $from_gallery, 'src' ); $image_list = array_merge( $image_list, $srcs ); } ++$image_booleans['gallery']; // @todo This count isn't correct, will only every count 1 } // @todo Can we check width/height of these efficiently? Could maybe use query args at least, before we strip them out $image_list = self::get_images_from_html( $post->post_content, $image_list, $extract_alt_text ); return self::build_image_struct( $image_list, $image_booleans ); } /* * Given an extracted image array reduce to src, alt_text, src_width, and src_height. * * @param array $images extracted image array. * * @return array reduced image array / protected static function reduce_extracted_images( $images ) { $ret_images = array(); foreach ( $images as $image ) { // skip if src isn't set. if ( empty( $image['src'] ) ) { continue; } $ret_image = array( 'url' => $image['src'], ); if ( ! empty( $image['src_height'] ) \|\| ! empty( $image['src_width'] ) ) { $ret_image['src_width'] = $image['src_width'] ?? ''; $ret_image['src_height'] = $image['src_height'] ?? ''; } if ( ! empty( $image['alt_text'] ) ) { $ret_image['alt_text'] = $image['alt_text']; } else { $ret_image = $image['src']; } $ret_images[] = $ret_image; } return $ret_images; } /* * Helper function to get images from HTML and return it with the set sturcture. * * @param string $content HTML content. * @param array $image_list Array of already found images. * @param string $extract_alt_text Whether or not to extract the alt text. * * @return array\|array[] Array of images. / public static function extract_images_from_content( $content, $image_list, $extract_alt_text = false ) { $image_list = self::get_images_from_html( $content, $image_list, $extract_alt_text ); return self::build_image_struct( $image_list, array() ); } /* * Produces a set structure for extracted media items. * * @param array $image_list Array of images. * @param array $image_booleans Image booleans. * * @return array\|array[] / public static function build_image_struct( $image_list, $image_booleans ) { if ( ! empty( $image_list ) ) { $retval = array( 'image' => array() ); $image_list = array_unique( $image_list, SORT_REGULAR ); foreach ( $image_list as $img ) { if ( is_string( $img ) ) { $retval['image'][] = array( 'url' => $img ); } else { $retval['image'][] = $img; } } $image_booleans['image'] = count( $retval['image'] ); if ( ! empty( $image_booleans ) ) { $retval['has'] = $image_booleans; } return $retval; } else { return array(); } } /* * Extracts images from html. * * @param string $html Some markup, possibly containing image tags. * @param array $images_already_extracted (just an array of image URLs without query strings, no special structure), used for de-duplication. * @param boolean $extract_alt_text Should alt_text be extracted, defaults to false. * * @return array Image URLs extracted from the HTML, stripped of query params and de-duped / public static function get_images_from_html( $html, $images_already_extracted, $extract_alt_text = false ) { $image_list = $images_already_extracted; $from_html = Jetpack_PostImages::from_html( $html ); // early return if no image in html. if ( empty( $from_html ) ) { return $image_list; } // process images. foreach ( $from_html as $extracted_image ) { $image_url = $extracted_image['src']; $length = strpos( $image_url, '?' ); $src = wp_parse_url( $image_url ); if ( $src && isset( $src['scheme'] ) && isset( $src['host'] ) && isset( $src['path'] ) ) { // Rebuild the URL without the query string. $queryless = $src['scheme'] . '://' . $src['host'] . $src['path']; } elseif ( $length ) { // If wp_parse_url() didn't work, strip off the query string the old fashioned way. $queryless = substr( $image_url, 0, $length ); } else { // Failing that, there was no spoon! Err ... query string! $queryless = $image_url; } // Discard URLs that are longer then 4KB, these are likely data URIs or malformed HTML. if ( 4096 < strlen( $queryless ) ) { continue; } if ( ! in_array( $queryless, $image_list, true ) ) { $image_to_add = array( 'url' => $queryless, ); if ( $extract_alt_text ) { if ( ! empty( $extracted_image['alt_text'] ) ) { $image_to_add['alt_text'] = $extracted_image['alt_text']; } if ( ! empty( $extracted_image['src_width'] ) \|\| ! empty( $extracted_image['src_height'] ) ) { $image_to_add['src_width'] = $extracted_image['src_width']; $image_to_add['src_height'] = $extracted_image['src_height']; } } else { $image_to_add = $queryless; } $image_list[] = $image_to_add; } } return $image_list; } /* * Strips concents of all tags, shortcodes, and decodes HTML entities. * * @param string $content Original content. * * @return string Cleaned content. */ private static function get_stripped_content( $content ) { $clean_content = wp_strip_all_tags( $content ); $clean_content = html_entity_decode( $clean_content, ENT_QUOTES \| ENT_SUBSTITUTE \| ENT_HTML401 ); // completely strip shortcodes and any content they enclose. $clean_content = strip_shortcodes( $clean_content ); return $clean_content; } }

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