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<title>[10520] sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/open-links-in-new-window.php: Theme Preview: Prevent navigation to external urls that are not WordPress.org hosted.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/10520">10520</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/10520","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dd32</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-12-16 07:30:13 +0000 (Wed, 16 Dec 2020)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Theme Preview: Prevent navigation to external urls that are not WordPress.org hosted.
As these previews are used within iframes on WordPress sites we need to ensure that only sites we control can be loaded within the iframe.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwpthemescompublic_htmlwpcontentmupluginspubopenlinksinnewwindowphp">sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/open-links-in-new-window.php</a></li>
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<h3>Diff</h3>
<a id="sitestrunkwpthemescompublic_htmlwpcontentmupluginspubopenlinksinnewwindowphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/open-links-in-new-window.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/open-links-in-new-window.php 2020-12-16 00:48:30 UTC (rev 10519)
+++ sites/trunk/wp-themes.com/public_html/wp-content/mu-plugins/pub/open-links-in-new-window.php 2020-12-16 07:30:13 UTC (rev 10520)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2,19 +2,47 @@
</span><span class="cx" style="display: block; padding: 0 10px"> namespace WordPressdotorg\Theme_Preview;
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Plugin Name: Open external links in new window/tab.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * Description: Injects some JS to cause all external links to open in a new tab, to work around X-Frame-Options (and presenting something as WordPress.org that isn't).
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * Description: Injects some JS to WordPress.org links to open in a new tab, and prevent navigation to other hostnames breaking preview iframes.
</ins><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'wp_footer', function() {
</span><span class="cx" style="display: block; padding: 0 10px"> echo '<script>
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-( function( base ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+( function() {
</ins><span class="cx" style="display: block; padding: 0 10px"> var links = document.getElementsByTagName( "a" );
</span><span class="cx" style="display: block; padding: 0 10px"> for ( var i = 0; i < links.length; i++ ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- var href = links[i].href.split( "#" )[0];
- if ( href && base !== href.substring( 0, base.length ) ) {
- links[i].target = "_blank";
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ var link = links[i],
+ url,
+ hostname;
+
+ try {
+ url = new URL( link.href, document.location.href );
+ hostname = url.hostname;
+ if ( "mailto:" === url.protocol ) {
+ hostname = "mailto"; // not whitelisted hostname to fall through.
+ }
+ } catch( e ) {
+ // Internet Explorer and invalid links, fall back to regex.
+ if ( hostname = link.href.match( /^\s*(?:(?:https?:)?\/\/)([^/]+)(\/|$)/ ) ) {
+ hostname = hostname[0];
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ // Self links are allowed.
+ if ( ! hostname || "wp-themes.com" === hostname ) {
+ continue;
+ }
+
+ // Links to WordPress.org should be allowed, but open in a new window.
+ if ( "wordpress.org" === hostname || ".wordpress.org" === hostname.substr(-14) ) {
+ link.target = "_blank";
+ continue;
+ }
+
+ // The link should not be followed, but the href is kept to allow for a[href^=] based styling.
+ link.addEventListener( "click", function( e ) {
+ e.preventDefault();
+ } );
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-} )( ' . wp_json_encode( home_url( '/' ) ) . ')
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+} )();
</ins><span class="cx" style="display: block; padding: 0 10px"> </script>';
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-} );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+}, 9999 );
</ins></span></pre>
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