Comments: Improve rel attribute usage in comments.
Internal links should be followed and it should be easier to modify other rel attributes on comments. This adds a helper function for determining if a URL is internal and also adds some new filters to make it easy to modify rel attributes in comments. Props thomasplevy, desrosj, sabernhardt, benish74, samiamnot, galbaras, jorbin. Fixes #53290, #56444. Built from https://develop.svn.wordpress.org/trunk@55289 git-svn-id: http://core.svn.wordpress.org/trunk@54822 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Aaron Jorbin
parent
ed511681a8
commit
6d179f0d90
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@ -219,13 +219,44 @@ function get_comment_author_email_link( $linktext = '', $before = '', $after = '
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*/
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function get_comment_author_link( $comment_ID = 0 ) {
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$comment = get_comment( $comment_ID );
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$comment_ID = ! empty( $comment->comment_ID ) ? $comment->comment_ID : (string) $comment_ID;
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$url = get_comment_author_url( $comment );
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$author = get_comment_author( $comment );
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if ( empty( $url ) || 'http://' === $url ) {
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$return = $author;
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} else {
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$return = "<a href='$url' rel='external nofollow ugc' class='url'>$author</a>";
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$rel_parts = array( 'ugc' );
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if ( ! wp_is_internal_link( $url ) ) {
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$rel_parts = array_merge(
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$rel_parts,
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array( 'external', 'nofollow' )
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);
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}
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/**
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* Filters the rel attributes of the comment author's link.
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*
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* @since 6.2.0
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*
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* @param string[] $rel_parts An array of strings representing the rel
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* tags which will be joined into the anchor's
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* rel attribute.
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* @param WP_Comment $comment The comment object
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*/
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$rel_parts = apply_filters( 'comment_author_link_rel', $rel_parts, $comment );
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$rel = implode( ' ', $rel_parts );
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$rel = esc_attr( $rel );
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// empty space before rel necessary for later sprintf.
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$rel = ! empty( $rel ) ? sprintf( ' rel="%s"', $rel ) : '';
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$return = sprintf(
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'<a href="%1$s" class="url"%2$s>%3$s</a>',
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$url,
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$rel,
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$author
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);
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}
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/**
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@ -239,7 +270,7 @@ function get_comment_author_link( $comment_ID = 0 ) {
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* @param string $author The comment author's username.
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* @param string $comment_ID The comment ID as a numeric string.
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*/
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return apply_filters( 'get_comment_author_link', $return, $author, $comment->comment_ID );
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return apply_filters( 'get_comment_author_link', $return, $author, $comment_ID );
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}
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/**
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@ -2917,24 +2917,9 @@ function _make_url_clickable_cb( $matches ) {
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return $matches[0];
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}
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if ( 'comment_text' === current_filter() ) {
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$rel = 'nofollow ugc';
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} else {
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$rel = 'nofollow';
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}
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$rel_attr = _make_clickable_rel_attr( $url );
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return $matches[1] . "<a href=\"$url\"$rel_attr>$url</a>" . $suffix;
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/**
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* Filters the rel value that is added to URL matches converted to links.
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*
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* @since 5.3.0
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*
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* @param string $rel The rel value.
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* @param string $url The matched URL being converted to a link tag.
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*/
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$rel = apply_filters( 'make_clickable_rel', $rel, $url );
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$rel = esc_attr( $rel );
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return $matches[1] . "<a href=\"$url\" rel=\"$rel\">$url</a>" . $suffix;
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}
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/**
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@ -2965,17 +2950,8 @@ function _make_web_ftp_clickable_cb( $matches ) {
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return $matches[0];
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}
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if ( 'comment_text' === current_filter() ) {
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$rel = 'nofollow ugc';
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} else {
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$rel = 'nofollow';
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}
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/** This filter is documented in wp-includes/formatting.php */
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$rel = apply_filters( 'make_clickable_rel', $rel, $dest );
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$rel = esc_attr( $rel );
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return $matches[1] . "<a href=\"$dest\" rel=\"$rel\">$dest</a>$ret";
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$rel_attr = _make_clickable_rel_attr( $dest );
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return $matches[1] . "<a href='{$dest}'{$rel_attr}>{$dest}</a>{$ret}";
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}
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/**
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@ -2994,6 +2970,48 @@ function _make_email_clickable_cb( $matches ) {
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return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
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}
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/**
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* Helper function used to build the "rel" attribute for a URL when creating an anchor using make_clickable().
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*
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* @since 6.2.0
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*
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* @param string $url The URL.
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* @return string The rel attribute for the anchor or an empty string if no rel attribute should be added.
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*/
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function _make_clickable_rel_attr( $url ) {
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$rel_parts = array();
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$scheme = strtolower( wp_parse_url( $url, PHP_URL_SCHEME ) );
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$nofollow_schemes = array_intersect( wp_allowed_protocols(), array( 'https', 'http' ) );
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// Apply "nofollow" to external links with qualifying URL schemes (mailto:, tel:, etc... shouldn't be followed).
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if ( ! wp_is_internal_link( $url ) && in_array( $scheme, $nofollow_schemes, true ) ) {
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$rel_parts[] = 'nofollow';
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}
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// Apply "ugc" when in comment context.
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if ( 'comment_text' === current_filter() ) {
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$rel_parts[] = 'ugc';
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}
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$rel = implode( ' ', $rel_parts );
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/**
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* Filters the rel value that is added to URL matches converted to links.
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*
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* @since 5.3.0
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*
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* @param string $rel The rel value.
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* @param string $url The matched URL being converted to a link tag.
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*/
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$rel = apply_filters( 'make_clickable_rel', $rel, $url );
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$rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : '';
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return $rel_attr;
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}
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/**
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* Converts plaintext URI to HTML links.
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*
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@ -3137,12 +3155,8 @@ function wp_rel_callback( $matches, $rel ) {
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$text = $matches[1];
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$atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );
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if ( ! empty( $atts['href'] ) ) {
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if ( in_array( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_SCHEME ) ), array( 'http', 'https' ), true ) ) {
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if ( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_HOST ) ) === strtolower( wp_parse_url( home_url(), PHP_URL_HOST ) ) ) {
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return "<a $text>";
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}
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}
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if ( ! empty( $atts['href'] ) && wp_is_internal_link( $atts['href']['value'] ) ) {
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$rel = trim( str_replace( 'nofollow', '', $rel ) );
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}
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if ( ! empty( $atts['rel'] ) ) {
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@ -3162,7 +3176,10 @@ function wp_rel_callback( $matches, $rel ) {
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}
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$text = trim( $html );
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}
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return "<a $text rel=\"" . esc_attr( $rel ) . '">';
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$rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : '';
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return "<a {$text}{$rel_attr}>";
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}
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/**
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@ -4688,3 +4688,63 @@ function get_the_privacy_policy_link( $before = '', $after = '' ) {
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return '';
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}
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/**
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* Returns an array of URL hosts which are considered to be internal hosts.
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*
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* By default the list of internal hosts is comproside of the PHP_URL_HOST of
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* the site's home_url() (as parsed by wp_parse_url()).
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*
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* This list is used when determining if a specificed URL is a link to a page on
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* the site itself or a link offsite (to an external host). This is used, for
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* example, when determining if the "nofollow" attribute should be applied to a
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* link.
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*
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* @see wp_is_internal_link
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*
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* @since 6.2.0
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*
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* @return string[] An array of URL hosts.
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*/
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function wp_internal_hosts() {
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static $internal_hosts;
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if ( empty( $internal_hosts ) ) {
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/**
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* Filters the array of URL hosts which are considered internal.
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*
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* @since 6.2.9
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*
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* @param array $internal_hosts An array of internal URL hostnames.
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*/
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$internal_hosts = apply_filters(
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'wp_internal_hosts',
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array(
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wp_parse_url( home_url(), PHP_URL_HOST ),
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)
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);
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$internal_hosts = array_unique(
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array_map( 'strtolower', (array) $internal_hosts )
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);
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}
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return $internal_hosts;
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}
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/**
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* Determines whether or not the specified URL is of a host included in the internal hosts list.
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*
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* @see wp_internal_hosts()
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*
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* @since 6.2.0
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*
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* @param string $link The URL to test.
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* @return bool Returns true for internal URLs and false for all other URLs.
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*/
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function wp_is_internal_link( $link ) {
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$link = strtolower( $link );
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if ( in_array( wp_parse_url( $link, PHP_URL_SCHEME ), wp_allowed_protocols(), true ) ) {
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return in_array( wp_parse_url( $link, PHP_URL_HOST ), wp_internal_hosts(), true );
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}
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return false;
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}
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@ -16,7 +16,7 @@
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*
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* @global string $wp_version
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*/
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$wp_version = '6.2-alpha-55288';
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$wp_version = '6.2-alpha-55289';
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/**
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* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
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