When setting the poster image for a video shortcode, set that image as the featured image for that attachment (if found) in the background. This AJAX functionality could be used for audio as well.

Introduces `attachment_url_to_postid()` to attempt to turn URLs into post IDs.

Fixes #27891.


git-svn-id: https://develop.svn.wordpress.org/trunk@29029 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/admin-ajax.php

@@ -60,7 +60,7 @@ $core_actions_post = array(
 	'wp-remove-post-lock', 'dismiss-wp-pointer', 'upload-attachment', 'get-attachment',
 	'query-attachments', 'save-attachment', 'save-attachment-compat', 'send-link-to-editor',
 	'send-attachment-to-editor', 'save-attachment-order', 'heartbeat', 'get-revision-diffs',
-	'save-user-color-scheme', 'update-widget', 'query-themes', 'parse-embed'
+	'save-user-color-scheme', 'update-widget', 'query-themes', 'parse-embed', 'set-attachment-thumbnail'
 );
 
 // Register core Ajax calls.

src/wp-admin/includes/ajax-actions.php

@@ -1946,6 +1946,55 @@ function wp_ajax_set_post_thumbnail() {
 	wp_die( 0 );
 }
 
+/**
+ * Ajax handler for setting the featured image for an attachment.
+ *
+ * @since 4.0.0
+ */
+function wp_ajax_set_attachment_thumbnail() {
+	if ( empty( $_POST['urls'] ) || ! is_array( $_POST['urls'] ) ) {
+		wp_send_json_error();
+	}
+
+	$thumbnail_id = (int) $_POST['thumbnail_id'];
+	if ( empty( $thumbnail_id ) ) {
+		wp_send_json_error();
+	}
+
+	$post_ids = array();
+	// For each URL, try to find its corresponding post ID.
+	foreach ( $_POST['urls'] as $url ) {
+		$post_id = attachment_url_to_postid( $url );
+		if ( ! empty( $post_id ) ) {
+			$post_ids[] = $post_id;
+		}
+	}
+
+	if ( empty( $post_ids ) ) {
+		wp_send_json_error();
+	}
+
+	$success = 0;
+	// For each found attachment, set its thumbnail.
+	foreach ( $post_ids as $post_id ) {
+		if ( ! current_user_can( 'edit_post', $post_id ) ) {
+			continue;
+		}
+
+		if ( set_post_thumbnail( $post_id, $thumbnail_id ) ) {
+			$success++;
+		}
+	}
+
+	if ( 0 === $success ) {
+		wp_send_json_error();
+	} else {
+		wp_send_json_success();
+	}
+
+	wp_send_json_error();
+}
+
 /**
  * Ajax handler for date formatting.
  *

src/wp-admin/includes/media.php

@@ -2642,6 +2642,11 @@ function edit_form_image_editor( $post ) {
 			$attr['height'] = $h;
 		}
 
+		$thumb_id = get_post_thumbnail_id( $attachment_id );
+		if ( ! empty( $thumb_id ) ) {
+			$attr['poster'] = wp_get_attachment_url( $thumb_id );
+		}
+
 		echo wp_video_shortcode( $attr );
 
 	endif; ?>