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<?php |
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/** |
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* OpenStation — My WordPress: per-post attached-media REST field. |
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* |
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* Registers `openstation_attached_media` on every public post |
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* type. Returns the canonical set of attachment ids referenced by |
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* the post — featured image + everything in `post_content` — |
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* computed server-side where `attachment_url_to_postid()` is |
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* available. |
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* |
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* Why server-side: a client regex over `content.rendered` catches |
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* the common `class="wp-image-N"` Gutenberg case, but misses: |
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* - Raw `<img src="…">` inserted via cross-window drag-bridge, |
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* plugin importers, or hand-edits with no `wp-image-N` class. |
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* - Gallery items that store the id in `data-id` / `data- |
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* attachment-id`. |
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* - Classic-editor `[caption id="attachment_N"]` shortcodes |
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* that render through `the_content` without re-emitting an |
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* `wp-image-N` class. |
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* |
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* Server has the full post object + WP core's URL→id resolver, so |
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* one round-trip per detail-view fetches an authoritative list. |
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* |
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* Filterable via `openstation_my_wordpress_attached_media` for |
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* plugins (page builders, ACF, custom field handlers) to append |
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* their own references. |
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* |
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* @package OpenStation |
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*/ |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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/** |
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* Register `openstation_attached_media` on every post type the site |
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* window can browse. |
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*/ |
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function openstation_my_wordpress_register_attached_media_field() { |
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$types = openstation_my_wordpress_rest_field_post_types(); |
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foreach ( $types as $type ) { |
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if ( 'attachment' === $type ) { |
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continue; |
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} |
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register_rest_field( |
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$type, |
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'openstation_attached_media', |
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array( |
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'get_callback' => static function ( $post ) { |
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$id = isset( $post['id'] ) ? (int) $post['id'] : 0; |
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return openstation_my_wordpress_post_attached_media( $id ); |
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}, |
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'schema' => array( |
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'description' => __( 'Attachment ids referenced by this post — featured image plus every attachment found in post_content (block-class scan + raw `<img src>` URL resolution).', 'desktop-mode' ), |
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'type' => 'array', |
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'items' => array( 'type' => 'integer' ), |
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'context' => array( 'view', 'edit' ), |
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'readonly' => true, |
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), |
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) |
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); |
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} |
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} |
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add_action( 'rest_api_init', 'openstation_my_wordpress_register_attached_media_field' ); |
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|
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/** |
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* Resolve every attachment referenced by `$post_id`. Featured |
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* image + a multi-pass scan of `post_content`: |
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* |
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* 1. `wp-image-N` class on any element. |
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* 2. `id="attachment_N"` (classic-editor caption shortcode). |
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* 3. `data-id="N"` and `data-attachment-id="N"` (gallery |
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* formats, Jetpack tiled-gallery, several SEO plugins). |
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* 4. Raw `<img src="…">` URLs resolved via `attachment_url_to_postid()`. |
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* Resolver results are cached in-process so a post embedding |
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* the same image twice only takes one DB hit per URL. |
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* |
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* @param int $post_id Post id. |
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* @return int[] Attachment ids, deduped, no order guarantee. |
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*/ |
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function openstation_my_wordpress_post_attached_media( $post_id ) { |
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$post_id = (int) $post_id; |
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if ( $post_id <= 0 ) { |
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return array(); |
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} |
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$post = get_post( $post_id ); |
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if ( ! $post ) { |
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return array(); |
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} |
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|
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$ids = array(); |
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|
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// Featured image. |
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$thumb = (int) get_post_thumbnail_id( $post_id ); |
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if ( $thumb > 0 ) { |
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$ids[ $thumb ] = true; |
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} |
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|
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$content = isset( $post->post_content ) ? (string) $post->post_content : ''; |
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if ( '' !== $content ) { |
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// Pass 1: explicit class / id / data-attribute patterns. |
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$patterns = array( |
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'/wp-image-(\d+)/', |
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'/id="attachment_(\d+)"/', |
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"/data-id=['\"](\d+)['\"]/", |
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"/data-attachment-id=['\"](\d+)['\"]/", |
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); |
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foreach ( $patterns as $pattern ) { |
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if ( preg_match_all( $pattern, $content, $m ) ) { |
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foreach ( $m[1] as $raw ) { |
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$id = (int) $raw; |
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if ( $id > 0 ) { |
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$ids[ $id ] = true; |
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} |
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} |
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} |
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} |
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|
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// Pass 2: resolve `<img src="…">` URLs. Catches images that |
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// none of the above patterns tagged — the cross-window |
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// drag-bridge insertion path being the canonical example. |
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if ( preg_match_all( '/<img[^>]+src=["\']([^"\']+)["\']/', $content, $m ) ) { |
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$seen_urls = array(); |
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foreach ( $m[1] as $url ) { |
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$url = (string) $url; |
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if ( '' === $url || isset( $seen_urls[ $url ] ) ) { |
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continue; |
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} |
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$seen_urls[ $url ] = true; |
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$resolved = openstation_my_wordpress_resolve_attachment_url( $url ); |
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if ( $resolved > 0 ) { |
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$ids[ $resolved ] = true; |
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} |
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} |
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} |
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} |
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|
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$out = array_map( 'intval', array_keys( $ids ) ); |
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|
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/** |
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* Filter the per-post attached-media id list. |
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* |
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* Plugins that store attachment references outside `post_content` |
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* (ACF image fields, page-builder block storage, post-meta |
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* galleries) can append their ids here. |
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* |
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* @param int[] $out Attachment ids resolved by the core scan. |
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* @param int $post_id Subject post id. |
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*/ |
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$filtered = apply_filters( 'openstation_my_wordpress_attached_media', $out, $post_id ); |
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|
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if ( ! is_array( $filtered ) ) { |
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return $out; |
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} |
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// Sanitize: positive integers, deduped. |
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$dedup = array(); |
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foreach ( $filtered as $id ) { |
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$id = (int) $id; |
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if ( $id > 0 ) { |
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$dedup[ $id ] = true; |
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} |
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} |
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return array_map( 'intval', array_keys( $dedup ) ); |
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} |
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|
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/** |
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* In-request URL→attachment-id cache. `attachment_url_to_postid` |
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* runs a SQL query per call; a post that embeds the same image |
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* multiple times (gallery + cover + content) would otherwise pay |
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* for each occurrence. |
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* |
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* @param string $url Image URL pulled from `<img src>`. |
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* @return int Attachment id, or 0 when no match. |
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*/ |
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function openstation_my_wordpress_resolve_attachment_url( $url ) { |
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static $cache = array(); |
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$url = (string) $url; |
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if ( '' === $url ) { |
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return 0; |
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} |
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if ( isset( $cache[ $url ] ) ) { |
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return (int) $cache[ $url ]; |
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} |
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// `attachment_url_to_postid()` does a literal `_wp_attached_file` |
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// meta lookup — it doesn't account for WP-generated variants: |
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// |
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// - Sized intermediates `image-300x200.jpg` — strip `-WxH`. |
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// - `-scaled.jpg` WP autogenerates this for uploads |
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// past the big-image threshold and |
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// stores it as `_wp_attached_file`, |
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// while editors emit the original |
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// URL in `<img src>`. Try BOTH the |
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// scaled→original strip AND the |
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// original→scaled append. |
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// |
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// Strip query strings from every candidate so cache-buster URLs |
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// (`?ver=…`) still resolve. |
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$strip_query = static function ( $u ) { |
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$pos = strpos( $u, '?' ); |
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return false === $pos ? $u : substr( $u, 0, $pos ); |
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}; |
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|
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$clean = $strip_query( $url ); |
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$candidates = array( $clean ); |
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|
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// `image-300x200.jpg` → `image.jpg` |
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if ( preg_match( '/^(.*)-\d+x\d+(\.[a-zA-Z0-9]+)$/', $clean, $m ) ) { |
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$candidates[] = $m[1] . $m[2]; |
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} |
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// `image-scaled.jpg` → `image.jpg` |
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if ( preg_match( '/^(.*)-scaled(\.[a-zA-Z0-9]+)$/', $clean, $m ) ) { |
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$candidates[] = $m[1] . $m[2]; |
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} |
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// `image.jpg` → `image-scaled.jpg` (post emits original, meta |
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// stores scaled — the most common drag-bridge insertion path). |
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if ( preg_match( '/^(.*)(\.[a-zA-Z0-9]+)$/', $clean, $m ) |
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&& ! preg_match( '/-scaled$/', $m[1] ) |
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) { |
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$candidates[] = $m[1] . '-scaled' . $m[2]; |
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} |
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|
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$resolved = 0; |
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foreach ( $candidates as $candidate ) { |
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$id = (int) attachment_url_to_postid( $candidate ); |
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if ( $id > 0 ) { |
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$resolved = $id; |
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break; |
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} |
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} |
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$cache[ $url ] = $resolved; |
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return $resolved; |
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} |
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|
