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<title>[56758] branches/6.3: Editor: Prevent possibility of a fatal error when previewing block themes.</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/56758">56758</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/56758","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>danielbachhuber</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2023-10-02 22:54:29 +0000 (Mon, 02 Oct 2023)</dd>
</dl>
<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Editor: Prevent possibility of a fatal error when previewing block themes.
Ensures that preview callbacks attached to the `stylesheet` and `template` filters do not run before `pluggable.php` has been included. These callbacks need functionality from `pluggable.php`.
Props scruffian, johnbillion, SergeyBiryukov, okat, azaozz.
Merges <a href="https://core.trac.wordpress.org/changeset/56529">[56529]</a> and <a href="https://core.trac.wordpress.org/changeset/56757">[56757]</a> to the 6.3 branch.
Fixes <a href="https://core.trac.wordpress.org/ticket/59000">#59000</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches63srcwpincludesdefaultfiltersphp">branches/6.3/src/wp-includes/default-filters.php</a></li>
<li><a href="#branches63srcwpincludesthemepreviewsphp">branches/6.3/src/wp-includes/theme-previews.php</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#branches63testsphpunitteststhemepreviewsphp">branches/6.3/tests/phpunit/tests/theme-previews.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches63">branches/6.3/</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/6.3
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/6.3 2023-10-02 22:40:36 UTC (rev 56757)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/6.3 2023-10-02 22:54:29 UTC (rev 56758)
</ins><a id="branches63"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/6.3</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/5.0:43681-43682,43684-43688,43719-43720,43723,43726-43727,43729-43731,43734-43744,43747,43751-43754,43758,43760-43765,43767-43770,43772,43774-43781,43783,43785,43790-43806,43808-43821,43825,43828,43830-43834,43836-43843,43846-43863,43867-43889,43891-43894,43897-43905,43908-43909,43911-43929,43931-43942,43946-43947,43949-43956,43959-43964,43967-43969,43988,43994,44014,44017,44047,44183,44185,44187-44206,44208-44213,44231-44232,44235,44248,44284,44287-44288
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.5:49373-49379,49381
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/5.8:51889
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56308-56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56381,56386,56401,56417,56422,56463,56490-56491,56503,56524,56550,56622
</del><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/trunk:56268,56272,56277,56279,56282,56284,56287,56290-56292,56296,56298,56300,56302,56308-56309,56311,56315,56320,56327,56329,56332,56335,56337,56339,56341,56350,56358,56365,56381,56386,56401,56417,56422,56463,56490-56491,56503,56524,56529,56550,56622,56757
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches63srcwpincludesdefaultfiltersphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/src/wp-includes/default-filters.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/src/wp-includes/default-filters.php 2023-10-02 22:40:36 UTC (rev 56757)
+++ branches/6.3/src/wp-includes/default-filters.php 2023-10-02 22:54:29 UTC (rev 56758)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -533,6 +533,9 @@
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'delete_attachment', '_delete_attachment_theme_mod' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'transition_post_status', '_wp_keep_alive_customize_changeset_dependent_auto_drafts', 20, 3 );
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+// Block Theme Previews.
+add_action( 'plugins_loaded', 'wp_initialize_theme_preview_hooks', 1 );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> // Calendar widget cache.
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'save_post', 'delete_get_calendar_cache' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'delete_post', 'delete_get_calendar_cache' );
</span></span></pre></div>
<a id="branches63srcwpincludesthemepreviewsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/6.3/src/wp-includes/theme-previews.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/src/wp-includes/theme-previews.php 2023-10-02 22:40:36 UTC (rev 56757)
+++ branches/6.3/src/wp-includes/theme-previews.php 2023-10-02 22:54:29 UTC (rev 56758)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -75,10 +75,19 @@
</span><span class="cx" style="display: block; padding: 0 10px"> <?php
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-// Attaches filters to enable theme previews in the Site Editor.
-if ( ! empty( $_GET['wp_theme_preview'] ) ) {
- add_filter( 'stylesheet', 'wp_get_theme_preview_path' );
- add_filter( 'template', 'wp_get_theme_preview_path' );
- add_action( 'init', 'wp_attach_theme_preview_middleware' );
- add_action( 'admin_head', 'wp_block_theme_activate_nonce' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/**
+ * Add filters and actions to enable Block Theme Previews in the Site Editor.
+ *
+ * The filters and actions should be added after `pluggable.php` is included as they may
+ * trigger code that uses `current_user_can()` which requires functionality from `pluggable.php`.
+ *
+ * @since 6.3.2
+ */
+function wp_initialize_theme_preview_hooks() {
+ if ( ! empty( $_GET['wp_theme_preview'] ) ) {
+ add_filter( 'stylesheet', 'wp_get_theme_preview_path' );
+ add_filter( 'template', 'wp_get_theme_preview_path' );
+ add_action( 'init', 'wp_attach_theme_preview_middleware' );
+ add_action( 'admin_head', 'wp_block_theme_activate_nonce' );
+ }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="branches63testsphpunitteststhemepreviewsphpfromrev56529trunktestsphpunitteststhemepreviewsphp"></a>
<div class="copfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Copied: branches/6.3/tests/phpunit/tests/theme-previews.php (from rev 56529, trunk/tests/phpunit/tests/theme-previews.php)</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/6.3/tests/phpunit/tests/theme-previews.php (rev 0)
+++ branches/6.3/tests/phpunit/tests/theme-previews.php 2023-10-02 22:54:29 UTC (rev 56758)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,27 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+
+/**
+ * test wp-includes/theme-previews.php
+ *
+ * @group themes
+ */
+class Tests_Theme_Previews extends WP_UnitTestCase {
+ public function set_up() {
+ parent::set_up();
+ }
+
+ public function tear_down() {
+ unset( $_GET['wp_theme_preview'] );
+ parent::tear_down();
+ }
+
+ public function test_initialize_theme_preview_hooks() {
+ $_GET['wp_theme_preview'] = 'twentytwentythree';
+ do_action( 'plugins_loaded' ); // Ensure `plugins_loaded` triggers `wp_initialize_theme_preview_hooks`.
+
+ $this->assertEquals( has_filter( 'stylesheet', 'wp_get_theme_preview_path' ), 10 );
+ $this->assertEquals( has_filter( 'template', 'wp_get_theme_preview_path' ), 10 );
+ $this->assertEquals( has_action( 'init', 'wp_attach_theme_preview_middleware' ), 10 );
+ $this->assertEquals( has_action( 'admin_head', 'wp_block_theme_activate_nonce' ), 10 );
+ }
+}
</ins></span></pre>
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