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<title>[55261] trunk: Privacy: Add `rel="privacy-policy"` to the Privacy Policy link.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/55261">55261</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/55261","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>audrasjb</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-02-07 14:03:26 +0000 (Tue, 07 Feb 2023)</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'>Privacy: Add `rel="privacy-policy"` to the Privacy Policy link.

This changeset adds a `rel="privacy-policy"` attribute to user-facing links to the Privacy Policy of the website, when a privacy policy page is set and available. While this `rel` value is still a RFC of the Link Types HTML specification, this changeset helps to make Privacy Policy link more discoverable for user agents and HTML parsers. 

Props dshanske, audrasjb, bhavz-10, bookwyrm, faisal03, JeffPaul, peterwilsoncc, paapst, davidbaumwald, costdev, robinwpdeveloper, kawserz.
Fixes <a href="https://core.trac.wordpress.org/ticket/56345">#56345</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswalkernavmenuphp">trunk/src/wp-includes/class-walker-nav-menu.php</a></li>
<li><a href="#trunksrcwpincludeslinktemplatephp">trunk/src/wp-includes/link-template.php</a></li>
<li><a href="#trunktestsphpunittestslinkgetThePrivacyPolicyLinkphp">trunk/tests/phpunit/tests/link/getThePrivacyPolicyLink.php</a></li>
<li><a href="#trunktestsphpunittestsmenuwalkernavmenuphp">trunk/tests/phpunit/tests/menu/walker-nav-menu.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswalkernavmenuphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-walker-nav-menu.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-walker-nav-menu.php   2023-02-07 13:51:39 UTC (rev 55260)
+++ trunk/src/wp-includes/class-walker-nav-menu.php     2023-02-07 14:03:26 UTC (rev 55261)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -182,7 +182,17 @@
</span><span class="cx" style="display: block; padding: 0 10px">                } else {
</span><span class="cx" style="display: block; padding: 0 10px">                        $atts['rel'] = $menu_item->xfn;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $atts['href']         = ! empty( $menu_item->url ) ? $menu_item->url : '';
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+               if ( ! empty( $menu_item->url ) ) {
+                       if ( get_privacy_policy_url() === $menu_item->url ) {
+                               $atts['rel'] = empty( $atts['rel'] ) ? 'privacy-policy' : $atts['rel'] . ' privacy-policy';
+                       }
+
+                       $atts['href'] = $menu_item->url;
+               } else {
+                       $atts['href'] = '';
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $atts['aria-current'] = $menu_item->current ? 'page' : '';
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                /**
</span></span></pre></div>
<a id="trunksrcwpincludeslinktemplatephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/link-template.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/link-template.php   2023-02-07 13:51:39 UTC (rev 55260)
+++ trunk/src/wp-includes/link-template.php     2023-02-07 14:03:26 UTC (rev 55261)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4664,7 +4664,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        if ( $privacy_policy_url && $page_title ) {
</span><span class="cx" style="display: block; padding: 0 10px">                $link = sprintf(
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        '<a class="privacy-policy-link" href="%s">%s</a>',
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 '<a class="privacy-policy-link" href="%s" rel="privacy-policy">%s</a>',
</ins><span class="cx" style="display: block; padding: 0 10px">                         esc_url( $privacy_policy_url ),
</span><span class="cx" style="display: block; padding: 0 10px">                        esc_html( $page_title )
</span><span class="cx" style="display: block; padding: 0 10px">                );
</span></span></pre></div>
<a id="trunktestsphpunittestslinkgetThePrivacyPolicyLinkphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/link/getThePrivacyPolicyLink.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/link/getThePrivacyPolicyLink.php        2023-02-07 13:51:39 UTC (rev 55260)
+++ trunk/tests/phpunit/tests/link/getThePrivacyPolicyLink.php  2023-02-07 14:03:26 UTC (rev 55261)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -160,4 +160,15 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public static function modify_link_markup( $link, $privacy_policy_url ) {
</span><span class="cx" style="display: block; padding: 0 10px">                return 'Policy: ' . $privacy_policy_url;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * Tests that `get_the_privacy_policy_link()` adds `rel="privacy-policy"`.
+        *
+        * @ticket 56345
+        */
+       public function test_get_the_privacy_policy_link_should_add_rel_privacy_policy() {
+               update_option( 'wp_page_for_privacy_policy', self::$privacy_policy_page_id );
+
+               $this->assertStringContainsString( 'rel="privacy-policy"', get_the_privacy_policy_link() );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="trunktestsphpunittestsmenuwalkernavmenuphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/menu/walker-nav-menu.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/menu/walker-nav-menu.php        2023-02-07 13:51:39 UTC (rev 55260)
+++ trunk/tests/phpunit/tests/menu/walker-nav-menu.php  2023-02-07 14:03:26 UTC (rev 55261)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -152,4 +152,217 @@
</span><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">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * Tests that `Walker_Nav_Menu::start_el()` adds `rel="privacy-policy"`.
+        *
+        * @ticket 56345
+        *
+        * @covers Walker_Nav_Menu::start_el
+        *
+        * @dataProvider data_walker_nav_menu_start_el_should_add_rel_privacy_policy_to_privacy_policy_url
+        *
+        * @param string $expected The expected substring containing the "rel" attribute and value.
+        * @param string $xfn      Optional. The XFN value. Default empty string.
+        * @param string $target   Optional. The target value. Default empty string.
+        */
+       public function test_walker_nav_menu_start_el_should_add_rel_privacy_policy_to_privacy_policy_url( $expected, $xfn = '', $target = '' ) {
+               $post_id = self::factory()->post->create(
+                       array(
+                               'post_type'   => 'page',
+                               'post_title'  => 'Test Privacy Policy',
+                               'post_status' => 'publish',
+                       )
+               );
+
+               // Set the privacy policy page.
+               update_option( 'wp_page_for_privacy_policy', $post_id );
+               $privacy_policy_id = (int) get_option( 'wp_page_for_privacy_policy' );
+
+               $output = '';
+
+               $item = array(
+                       'ID'        => $privacy_policy_id,
+                       'object_id' => $privacy_policy_id,
+                       'title'     => 'Privacy Policy',
+                       'target'    => $target,
+                       'xfn'       => $xfn,
+                       'current'   => false,
+                       'url'       => get_privacy_policy_url(),
+               );
+
+               $args = array(
+                       'before'      => '',
+                       'after'       => '',
+                       'link_before' => '',
+                       'link_after'  => '',
+               );
+
+               $this->walker->start_el( $output, (object) $item, 0, (object) $args );
+
+               $this->assertStringContainsString( $expected, $output );
+       }
+
+       /**
+        * Data provider.
+        *
+        * @return array[]
+        */
+       public function data_walker_nav_menu_start_el_should_add_rel_privacy_policy_to_privacy_policy_url() {
+               return array(
+                       'no xfn value'                          => array(
+                               'expected' => 'rel="privacy-policy"',
+                       ),
+                       'an xfn value'                          => array(
+                               'expected' => 'rel="nofollow privacy-policy"',
+                               'xfn'      => 'nofollow',
+                       ),
+                       'no xfn value and a target of "_blank"' => array(
+                               'expected' => 'rel="noopener privacy-policy"',
+                               'xfn'      => '',
+                               'target'   => '_blank',
+                       ),
+                       'an xfn value and a target of "_blank"' => array(
+                               'expected' => 'rel="nofollow privacy-policy"',
+                               'xfn'      => 'nofollow',
+                               'target'   => '_blank',
+                       ),
+               );
+       }
+
+       /**
+        * Tests that `Walker_Nav_Menu::start_el()` does not add `rel="privacy-policy"` when no
+        * privacy policy page exists.
+        *
+        * @ticket 56345
+        *
+        * @covers Walker_Nav_Menu::start_el
+        */
+       public function test_walker_nav_menu_start_el_should_not_add_rel_privacy_policy_when_no_privacy_policy_exists() {
+               $post_id = self::factory()->post->create(
+                       array(
+                               'post_type'   => 'page',
+                               'post_title'  => 'Test Privacy Policy',
+                               'post_status' => 'publish',
+                       )
+               );
+
+               // Do not set the privacy policy page.
+
+               $output = '';
+
+               $item = array(
+                       'ID'        => $post_id,
+                       'object_id' => $post_id,
+                       'title'     => 'Privacy Policy',
+                       'target'    => '',
+                       'xfn'       => '',
+                       'current'   => false,
+                       'url'       => get_the_permalink( $post_id ),
+               );
+
+               $args = array(
+                       'before'      => '',
+                       'after'       => '',
+                       'link_before' => '',
+                       'link_after'  => '',
+               );
+
+               $this->walker->start_el( $output, (object) $item, 0, (object) $args );
+
+               $this->assertStringNotContainsString( 'rel="privacy-policy"', $output );
+       }
+
+       /**
+        * Tests that `Walker_Nav_Menu::start_el()` does not add `rel="privacy-policy"` when no URL
+        * is passed in the menu item object.
+        *
+        * @ticket 56345
+        *
+        * @covers Walker_Nav_Menu::start_el
+        */
+       public function test_walker_nav_menu_start_el_should_not_add_rel_privacy_policy_when_no_url_is_passed() {
+               $post_id = self::factory()->post->create(
+                       array(
+                               'post_type'   => 'page',
+                               'post_title'  => 'Test Privacy Policy',
+                               'post_status' => 'publish',
+                       )
+               );
+
+               // Set the privacy policy page.
+               update_option( 'wp_page_for_privacy_policy', $post_id );
+               $privacy_policy_id = (int) get_option( 'wp_page_for_privacy_policy' );
+
+               $output = '';
+
+               $item = array(
+                       'ID'        => $privacy_policy_id,
+                       'object_id' => $privacy_policy_id,
+                       'title'     => 'Privacy Policy',
+                       'target'    => '',
+                       'xfn'       => '',
+                       'current'   => false,
+                       // Do not pass URL.
+               );
+
+               $args = array(
+                       'before'      => '',
+                       'after'       => '',
+                       'link_before' => '',
+                       'link_after'  => '',
+               );
+
+               $this->walker->start_el( $output, (object) $item, 0, (object) $args );
+
+               $this->assertStringNotContainsString( 'rel="privacy-policy"', $output );
+       }
+
+       /**
+        * Tests that `Walker_Nav_Menu::start_el()` does not add `rel="privacy-policy"` when the
+        * menu item's ID does not match the privacy policy page, but the URL does.
+        *
+        * @ticket 56345
+        *
+        * @covers Walker_Nav_Menu::start_el
+        */
+       public function test_walker_nav_menu_start_el_should_add_rel_privacy_policy_when_id_does_not_match_but_url_does() {
+               $post_id = self::factory()->post->create(
+                       array(
+                               'post_type'   => 'page',
+                               'post_title'  => 'Test Privacy Policy',
+                               'post_status' => 'publish',
+                       )
+               );
+
+               // Set the privacy policy page.
+               update_option( 'wp_page_for_privacy_policy', $post_id );
+               $privacy_policy_id = (int) get_option( 'wp_page_for_privacy_policy' );
+
+               $output = '';
+
+               // Ensure the ID does not match the privacy policy.
+               $not_privacy_policy_id = $privacy_policy_id - 1;
+
+               $item = array(
+                       'ID'        => $not_privacy_policy_id,
+                       'object_id' => $not_privacy_policy_id,
+                       'title'     => 'Privacy Policy',
+                       'target'    => '',
+                       'xfn'       => '',
+                       'current'   => false,
+                       'url'       => get_privacy_policy_url(),
+               );
+
+               $args = array(
+                       'before'      => '',
+                       'after'       => '',
+                       'link_before' => '',
+                       'link_after'  => '',
+               );
+
+               $this->walker->start_el( $output, (object) $item, 0, (object) $args );
+
+               $this->assertStringContainsString( 'rel="privacy-policy"', $output );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre>
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