Changeset 46564 for trunk/src/wp-includes/formatting.php

Timestamp:

10/21/2019 08:39:16 PM (4 years ago)

Author:

SergeyBiryukov

Message:

Comments: Add rel="nofollow ugc" attribute when converting plain URLs to <a> tags in comments via make_clickable().

Introduce make_clickable_rel filter for the rel value that is added to URL matches converted to links.

This is a follow-up to [46349], which added the rel="nofollow ugc" attribute to existing <a> tags in comments via wp_rel_ugc().

UGC stands for User Generated Content, and the ugc attribute value is recommended for links within user generated content, such as comments and forum posts.

See ​https://webmasters.googleblog.com/2019/09/evolving-nofollow-new-ways-to-identify.html.

Props blogginglife, SergeyBiryukov.
Reviewed by desrosj, audrasjb.
Fixes #48022.

File:

• trunk/src/wp-includes/formatting.php (modified) (3 diffs)

trunk/src/wp-includes/formatting.php

@@ -2836 +2836 @@
     }
 
-    return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix;
+    if ( 'comment_text' === current_filter() ) {
+        $rel = 'nofollow ugc';
+    } else {
+        $rel = 'nofollow';
+    }
+
+    /**
+     * Filters the rel value that is added to URL matches converted to links.
+     *
+     * @since 5.3.0
+     *
+     * @param string $rel The rel value.
+     * @param string $url The matched URL being converted to a link tag.
+     */
+    $rel = apply_filters( 'make_clickable_rel', $rel, $url );
+    $rel = esc_attr( $rel );
+
+    return $matches[1] . "<a href=\"$url\" rel=\"$rel\">$url</a>" . $suffix;
 }
 
@@ -2866 +2883 @@
     }
 
-    return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";
+    if ( 'comment_text' === current_filter() ) {
+        $rel = 'nofollow ugc';
+    } else {
+        $rel = 'nofollow';
+    }
+
+    /** This filter is documented in wp-includes/formatting.php */
+    $rel = apply_filters( 'make_clickable_rel', $rel, $dest );
+    $rel = esc_attr( $rel );
+
+    return $matches[1] . "<a href=\"$dest\" rel=\"$rel\">$dest</a>$ret";
 }
 
@@ -3149 +3176 @@
      * @since 5.1.0
      *
-     * @param string The rel values.
+     * @param string $rel       The rel values.
      * @param string $link_html The matched content of the link tag including all HTML attributes.
      */