437 lines
17 KiB
PHP
437 lines
17 KiB
PHP
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<?php
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/**
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* Class with methods to extract metadata from a post/page about videos, images, links, mentions embedded
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* in or attached to the post/page.
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*
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* @todo Additionally, have some filters on number of items in each field
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*/
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class Jetpack_Media_Meta_Extractor {
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// Some consts for what to extract
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const ALL = 255;
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const LINKS = 1;
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const MENTIONS = 2;
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const IMAGES = 4;
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const SHORTCODES = 8; // Only the keeper shortcodes below
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const EMBEDS = 16;
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const HASHTAGS = 32;
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// For these, we try to extract some data from the shortcode, rather than just recording its presence (which we do for all)
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// There should be a function get_{shortcode}_id( $atts ) or static method SomethingShortcode::get_{shortcode}_id( $atts ) for these.
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private static $KEEPER_SHORTCODES = array(
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'youtube',
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'vimeo',
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'hulu',
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'ted',
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'wpvideo',
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'audio',
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);
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/**
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* Gets the specified media and meta info from the given post.
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* NOTE: If you have the post's HTML content already and don't need image data, use extract_from_content() instead.
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*
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* @param $blog_id The ID of the blog
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* @param $post_id The ID of the post
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* @param $what_to_extract (int) A mask of things to extract, e.g. Jetpack_Media_Meta_Extractor::IMAGES | Jetpack_Media_Meta_Extractor::MENTIONS
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* @returns a structure containing metadata about the embedded things, or empty array if nothing found, or WP_Error on error
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*/
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static public function extract( $blog_id, $post_id, $what_to_extract = self::ALL ) {
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// multisite?
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if ( function_exists( 'switch_to_blog') )
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switch_to_blog( $blog_id );
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$post = get_post( $post_id );
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$content = $post->post_title . "\n\n" . $post->post_content;
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$char_cnt = strlen( $content );
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//prevent running extraction on really huge amounts of content
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if ( $char_cnt > 100000 ) //about 20k English words
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$content = substr( $content, 0, 100000 );
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$extracted = array();
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// Get images first, we need the full post for that
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if ( self::IMAGES & $what_to_extract ) {
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$extracted = self::get_image_fields( $post );
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// Turn off images so we can safely call extract_from_content() below
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$what_to_extract = $what_to_extract - self::IMAGES;
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}
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if ( function_exists( 'switch_to_blog') )
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restore_current_blog();
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// All of the other things besides images can be extracted from just the content
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$extracted = self::extract_from_content( $content, $what_to_extract, $extracted );
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return $extracted;
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}
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/**
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* Gets the specified meta info from the given post content.
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* NOTE: If you want IMAGES, call extract( $blog_id, $post_id, ...) which will give you more/better image extraction
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* This method will give you an error if you ask for IMAGES.
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*
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* @param $content The HTML post_content of a post
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* @param $what_to_extract (int) A mask of things to extract, e.g. Jetpack_Media_Meta_Extractor::IMAGES | Jetpack_Media_Meta_Extractor::MENTIONS
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* @param $already_extracted (array) Previously extracted things, e.g. images from extract(), which can be used for x-referencing here
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* @returns a structure containing metadata about the embedded things, or empty array if nothing found, or WP_Error on error
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*/
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static public function extract_from_content( $content, $what_to_extract = self::ALL, $already_extracted = array() ) {
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$stripped_content = self::get_stripped_content( $content );
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// Maybe start with some previously extracted things (e.g. images from extract()
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$extracted = $already_extracted;
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// Embedded media objects will have already been converted to shortcodes by pre_kses hooks on save.
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if ( self::IMAGES & $what_to_extract ) {
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$images = Jetpack_Media_Meta_Extractor::extract_images_from_content( $stripped_content, array() );
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$extracted = array_merge( $extracted, $images );
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}
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// ----------------------------------- MENTIONS ------------------------------
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if ( self::MENTIONS & $what_to_extract ) {
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if ( preg_match_all( '/(^|\s)@(\w+)/u', $stripped_content, $matches ) ) {
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$mentions = array_values( array_unique( $matches[2] ) ); //array_unique() retains the keys!
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$mentions = array_map( 'strtolower', $mentions );
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$extracted['mention'] = array( 'name' => $mentions );
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if ( !isset( $extracted['has'] ) )
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$extracted['has'] = array();
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$extracted['has']['mention'] = count( $mentions );
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}
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}
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// ----------------------------------- HASHTAGS ------------------------------
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/** Some hosts may not compile with --enable-unicode-properties and kick a warning:
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* Warning: preg_match_all() [function.preg-match-all]: Compilation failed: support for \P, \p, and \X has not been compiled
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* Therefore, we only run this code block on wpcom, not in Jetpack.
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*/
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if ( ( defined( 'IS_WPCOM' ) && IS_WPCOM ) && ( self::HASHTAGS & $what_to_extract ) ) {
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//This regex does not exactly match Twitter's
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// if there are problems/complaints we should implement this:
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// https://github.com/twitter/twitter-text/blob/master/java/src/com/twitter/Regex.java
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if ( preg_match_all( '/(?:^|\s)#(\w*\p{L}+\w*)/u', $stripped_content, $matches ) ) {
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$hashtags = array_values( array_unique( $matches[1] ) ); //array_unique() retains the keys!
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$hashtags = array_map( 'strtolower', $hashtags );
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$extracted['hashtag'] = array( 'name' => $hashtags );
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if ( !isset( $extracted['has'] ) )
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$extracted['has'] = array();
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$extracted['has']['hashtag'] = count( $hashtags );
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}
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}
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// ----------------------------------- SHORTCODES ------------------------------
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// Always look for shortcodes.
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// If we don't want them, we'll just remove them, so we don't grab them as links below
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$shortcode_pattern = '/' . get_shortcode_regex() . '/s';
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if ( preg_match_all( $shortcode_pattern, $content, $matches ) ) {
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$shortcode_total_count = 0;
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$shortcode_type_counts = array();
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$shortcode_types = array();
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$shortcode_details = array();
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if ( self::SHORTCODES & $what_to_extract ) {
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foreach( $matches[2] as $key => $shortcode ) {
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//Elasticsearch (and probably other things) doesn't deal well with some chars as key names
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$shortcode_name = preg_replace( '/[.,*"\'\/\\\\#+ ]/', '_', $shortcode );
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$attr = shortcode_parse_atts( $matches[3][ $key ] );
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$shortcode_total_count++;
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if ( ! isset( $shortcode_type_counts[$shortcode_name] ) )
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$shortcode_type_counts[$shortcode_name] = 0;
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$shortcode_type_counts[$shortcode_name]++;
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// Store (uniquely) presence of all shortcode regardless of whether it's a keeper (for those, get ID below)
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// @todo Store number of occurrences?
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if ( ! in_array( $shortcode_name, $shortcode_types ) )
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$shortcode_types[] = $shortcode_name;
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// For keeper shortcodes, also store the id/url of the object (e.g. youtube video, TED talk, etc.)
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if ( in_array( $shortcode, self::$KEEPER_SHORTCODES ) ) {
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unset( $id ); // Clear shortcode ID data left from the last shortcode
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// We'll try to get the salient ID from the function jetpack_shortcode_get_xyz_id()
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// If the shortcode is a class, we'll call XyzShortcode::get_xyz_id()
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$shortcode_get_id_func = "jetpack_shortcode_get_{$shortcode}_id";
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$shortcode_class_name = ucfirst( $shortcode ) . 'Shortcode';
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$shortcode_get_id_method = "get_{$shortcode}_id";
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if ( function_exists( $shortcode_get_id_func ) ) {
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$id = call_user_func( $shortcode_get_id_func, $attr );
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} else if ( method_exists( $shortcode_class_name, $shortcode_get_id_method ) ) {
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$id = call_user_func( array( $shortcode_class_name, $shortcode_get_id_method ), $attr );
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}
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if ( ! empty( $id )
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&& ( ! isset( $shortcode_details[$shortcode_name] ) || ! in_array( $id, $shortcode_details[$shortcode_name] ) ) )
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$shortcode_details[$shortcode_name][] = $id;
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}
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}
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if ( $shortcode_total_count > 0 ) {
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// Add the shortcode info to the $extracted array
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if ( !isset( $extracted['has'] ) )
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$extracted['has'] = array();
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$extracted['has']['shortcode'] = $shortcode_total_count;
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$extracted['shortcode'] = array();
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foreach ( $shortcode_type_counts as $type => $count )
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$extracted['shortcode'][$type] = array( 'count' => $count );
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if ( ! empty( $shortcode_types ) )
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$extracted['shortcode_types'] = $shortcode_types;
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foreach ( $shortcode_details as $type => $id )
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$extracted['shortcode'][$type]['id'] = $id;
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}
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}
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// Remove the shortcodes form our copy of $content, so we don't count links in them as links below.
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$content = preg_replace( $shortcode_pattern, ' ', $content );
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}
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// ----------------------------------- LINKS ------------------------------
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if ( self::LINKS & $what_to_extract ) {
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// To hold the extracted stuff we find
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$links = array();
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// @todo Get the text inside the links?
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// Grab any links, whether in <a href="..." or not, but subtract those from shortcodes and images
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// (we treat embed links as just another link)
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if ( preg_match_all( '#(?:^|\s|"|\')(https?://([^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))))#', $content, $matches ) ) {
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foreach ( $matches[1] as $link_raw ) {
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$url = parse_url( $link_raw );
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// Data URI links
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if ( isset( $url['scheme'] ) && 'data' === $url['scheme'] )
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continue;
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// Remove large (and likely invalid) links
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if ( 4096 < strlen( $link_raw ) )
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continue;
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// Build a simple form of the URL so we can compare it to ones we found in IMAGES or SHORTCODES and exclude those
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$simple_url = $url['scheme'] . '://' . $url['host'] . ( ! empty( $url['path'] ) ? $url['path'] : '' );
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if ( isset( $extracted['image']['url'] ) ) {
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if ( in_array( $simple_url, (array) $extracted['image']['url'] ) )
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continue;
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}
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list( $proto, $link_all_but_proto ) = explode( '://', $link_raw );
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// Build a reversed hostname
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$host_parts = array_reverse( explode( '.', $url['host'] ) );
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$host_reversed = '';
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foreach ( $host_parts as $part ) {
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$host_reversed .= ( ! empty( $host_reversed ) ? '.' : '' ) . $part;
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}
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$link_analyzed = '';
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if ( !empty( $url['path'] ) ) {
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// The whole path (no query args or fragments)
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$path = substr( $url['path'], 1 ); // strip the leading '/'
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$link_analyzed .= ( ! empty( $link_analyzed ) ? ' ' : '' ) . $path;
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// The path split by /
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$path_split = explode( '/', $path );
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if ( count( $path_split ) > 1 ) {
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$link_analyzed .= ' ' . implode( ' ', $path_split );
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}
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// The fragment
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if ( ! empty( $url['fragment'] ) )
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$link_analyzed .= ( ! empty( $link_analyzed ) ? ' ' : '' ) . $url['fragment'];
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}
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// @todo Check unique before adding
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$links[] = array(
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'url' => $link_all_but_proto,
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'host_reversed' => $host_reversed,
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'host' => $url['host'],
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);
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}
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}
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$link_count = count( $links );
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if ( $link_count ) {
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$extracted[ 'link' ] = $links;
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if ( !isset( $extracted['has'] ) )
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$extracted['has'] = array();
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$extracted['has']['link'] = $link_count;
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}
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}
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// ----------------------------------- EMBEDS ------------------------------
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//Embeds are just individual links on their own line
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if ( self::EMBEDS & $what_to_extract ) {
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if ( !function_exists( '_wp_oembed_get_object' ) )
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include( ABSPATH . WPINC . '/class-oembed.php' );
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// get an oembed object
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$oembed = _wp_oembed_get_object();
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// Grab any links on their own lines that may be embeds
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if ( preg_match_all( '|^\s*(https?://[^\s"]+)\s*$|im', $content, $matches ) ) {
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// To hold the extracted stuff we find
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$embeds = array();
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foreach ( $matches[1] as $link_raw ) {
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$url = parse_url( $link_raw );
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list( $proto, $link_all_but_proto ) = explode( '://', $link_raw );
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// Check whether this "link" is really an embed.
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foreach ( $oembed->providers as $matchmask => $data ) {
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list( $providerurl, $regex ) = $data;
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// Turn the asterisk-type provider URLs into regex
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if ( !$regex ) {
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$matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
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$matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
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}
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if ( preg_match( $matchmask, $link_raw ) ) {
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$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
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$embeds[] = $link_all_but_proto; // @todo Check unique before adding
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// @todo Try to get ID's for the ones we care about (shortcode_keepers)
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break;
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}
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}
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}
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if ( ! empty( $embeds ) ) {
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if ( !isset( $extracted['has'] ) )
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$extracted['has'] = array();
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$extracted['has']['embed'] = count( $embeds );
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$extracted['embed'] = array( 'url' => array() );
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foreach ( $embeds as $e )
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$extracted['embed']['url'][] = $e;
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}
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}
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}
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return $extracted;
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}
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/**
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* @param $post A post object
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* @param $args (array) Optional args, see defaults list for details
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* @returns array Returns an array of all images meeting the specified criteria in $args
|
||
|
|
*
|
||
|
|
* Uses Jetpack Post Images
|
||
|
|
*/
|
||
|
|
private static function get_image_fields( $post, $args = array() ) {
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||
|
|
|
||
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|
$defaults = array(
|
||
|
|
'width' => 200, // Required minimum width (if possible to determine)
|
||
|
|
'height' => 200, // Required minimum height (if possible to determine)
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|
);
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||
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|
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||
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|
$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 ) ) {
|
||
|
|
$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 ) ) {
|
||
|
|
$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 ) ) {
|
||
|
|
$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 = Jetpack_Media_Meta_Extractor::get_images_from_html( $post->post_content, $image_list );
|
||
|
|
|
||
|
|
return Jetpack_Media_Meta_Extractor::build_image_struct( $image_list );
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function extract_images_from_content( $content, $image_list ) {
|
||
|
|
$image_list = Jetpack_Media_Meta_Extractor::get_images_from_html( $content, $image_list );
|
||
|
|
return Jetpack_Media_Meta_Extractor::build_image_struct( $image_list );
|
||
|
|
}
|
||
|
|
|
||
|
|
public static function build_image_struct( $image_list ) {
|
||
|
|
if ( ! empty( $image_list ) ) {
|
||
|
|
$retval = array( 'image' => array() );
|
||
|
|
$image_list = array_unique( $image_list );
|
||
|
|
foreach ( $image_list as $img ) {
|
||
|
|
$retval['image'][] = array( 'url' => $img );
|
||
|
|
}
|
||
|
|
$image_booleans['image'] = count( $retval['image'] );
|
||
|
|
if ( ! empty( $image_booleans ) )
|
||
|
|
$retval['has'] = $image_booleans;
|
||
|
|
return $retval;
|
||
|
|
} else {
|
||
|
|
return array();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
*
|
||
|
|
* @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
|
||
|
|
* @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 ) {
|
||
|
|
$image_list = $images_already_extracted;
|
||
|
|
$from_html = Jetpack_PostImages::from_html( $html );
|
||
|
|
if ( !empty( $from_html ) ) {
|
||
|
|
$srcs = wp_list_pluck( $from_html, 'src' );
|
||
|
|
foreach( $srcs as $image_url ) {
|
||
|
|
if ( ( $src = parse_url( $image_url ) ) && isset( $src['scheme'], $src['host'], $src['path'] ) ) {
|
||
|
|
// Rebuild the URL without the query string
|
||
|
|
$queryless = $src['scheme'] . '://' . $src['host'] . $src['path'];
|
||
|
|
} elseif ( $length = strpos( $image_url, '?' ) ) {
|
||
|
|
// If 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 ) ) {
|
||
|
|
$image_list[] = $queryless;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return $image_list;
|
||
|
|
}
|
||
|
|
|
||
|
|
private static function get_stripped_content( $content ) {
|
||
|
|
$clean_content = strip_tags( $content );
|
||
|
|
$clean_content = html_entity_decode( $clean_content );
|
||
|
|
//completely strip shortcodes and any content they enclose
|
||
|
|
$clean_content = strip_shortcodes( $clean_content );
|
||
|
|
return $clean_content;
|
||
|
|
}
|
||
|
|
}
|