From 0b16d7a71acef1222d08c114adddb0766f3261bc Mon Sep 17 00:00:00 2001
From: wppoland <szatkowski.mariusz+github@gmail.com>
Date: Sun, 3 May 2026 16:58:44 +0200
Subject: [PATCH] REST API: Allow `null` `origin` in the templates schema.

`WP_REST_Templates_Controller::prepare_item_for_response()` can return
`origin: null` for templates that do not come from a customizer/theme/plugin source.

The schema previously declared `origin` as `string`, so responses with `origin: null`
failed schema validation under strict-mode REST clients.

This commit widens the schema to match the runtime behavior:

* `origin` becomes `[ string, null ]`.

Adds tests covering:

* The `origin` schema accepts `null`.
* A theme template returns `null` for `origin` against the new schema.

(Note: `modified` returning `null` was separately resolved in [62941] / #65728).

See #64168.
---
 .../class-wp-rest-templates-controller.php    |  2 +-
 .../rest-api/wpRestTemplatesController.php    | 32 +++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
index 190eea6b203bb..eabf907590b99 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-templates-controller.php
@@ -1106,7 +1106,7 @@ public function get_item_schema() {
 				),
 				'origin'          => array(
 					'description' => __( 'Source of a customized template' ),
-					'type'        => 'string',
+					'type'        => array( 'string', 'null' ),
 					'context'     => array( 'embed', 'view', 'edit' ),
 					'readonly'    => true,
 				),
diff --git a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
index 3eee1426ecb87..0f1fd1f5928ad 100644
--- a/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
+++ b/tests/phpunit/tests/rest-api/wpRestTemplatesController.php
@@ -1039,6 +1039,38 @@ public function test_get_item_schema() {
 		$this->assertArrayHasKey( 'plugin', $properties );
 	}
 
+	/**
+	 * @ticket 64168
+	 * @covers WP_REST_Templates_Controller::get_item_schema
+	 */
+	public function test_get_item_schema_origin_allows_null() {
+		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/templates' );
+		$response   = rest_get_server()->dispatch( $request );
+		$data       = $response->get_data();
+		$properties = $data['schema']['properties'];
+
+		$this->assertArrayHasKey( 'origin', $properties );
+		$this->assertSame(
+			array( 'string', 'null' ),
+			$properties['origin']['type'],
+			'The origin property type should allow string and null.'
+		);
+	}
+
+
+	/**
+	 * @ticket 64168
+	 * @covers WP_REST_Templates_Controller::prepare_item_for_response
+	 */
+	public function test_get_item_with_theme_template_returns_null_origin() {
+		wp_set_current_user( self::$admin_id );
+		$request  = new WP_REST_Request( 'GET', '/wp/v2/templates/default//my_template' );
+		$response = rest_get_server()->dispatch( $request );
+		$data     = $response->get_data();
+
+		$this->assertNull( $data['origin'], 'Theme template origin should be null.' );
+	}
+
 	protected function find_and_normalize_template_by_id( $templates, $id ) {
 		foreach ( $templates as $template ) {
 			if ( $template['id'] === $id ) {