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<title>[59032] trunk: REST API: Automatically populate targetHints for the Allow header.</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/59032">59032</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/59032","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>TimothyBlynJacobs</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-09-17 21:50:38 +0000 (Tue, 17 Sep 2024)</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'>REST API: Automatically populate targetHints for the Allow header.
The REST API uses the "Allow" header to communicate what methods a user is authorized to perform on a resource. This works great when operating on a single item route, but can break down when needing to determine authorization over a collection of items.
This commit uses the "targetHints" property of JSON Hyper Schema to provide access to the "allow" header for "self" links. This alleviates needing to make a separate network request for each item in a collection.
Props mamaduka, noisysocks, peterwilsoncc, spacedmonkey, swissspidy, timothyblynjacobs, tyxla, youknowriad.
Fixes <a href="https://core.trac.wordpress.org/ticket/61739">#61739</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesrestapiclasswprestserverphp">trunk/src/wp-includes/rest-api/class-wp-rest-server.php</a></li>
<li><a href="#trunktestsphpunittestsrestapirestserverphp">trunk/tests/phpunit/tests/rest-api/rest-server.php</a></li>
<li><a href="#trunktestsqunitfixtureswpapigeneratedjs">trunk/tests/qunit/fixtures/wp-api-generated.js</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesrestapiclasswprestserverphp"></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/rest-api/class-wp-rest-server.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/rest-api/class-wp-rest-server.php 2024-09-17 21:31:14 UTC (rev 59031)
+++ trunk/src/wp-includes/rest-api/class-wp-rest-server.php 2024-09-17 21:50:38 UTC (rev 59032)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -636,7 +636,18 @@
</span><span class="cx" style="display: block; padding: 0 10px"> foreach ( $items as $item ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $attributes = $item['attributes'];
</span><span class="cx" style="display: block; padding: 0 10px"> $attributes['href'] = $item['href'];
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $data[ $rel ][] = $attributes;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ if ( 'self' !== $rel ) {
+ $data[ $rel ][] = $attributes;
+ continue;
+ }
+
+ $target_hints = self::get_target_hints_for_link( $attributes );
+ if ( $target_hints ) {
+ $attributes['targetHints'] = $target_hints;
+ }
+
+ $data[ $rel ][] = $attributes;
</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">
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -644,6 +655,57 @@
</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">+ * Gets the target links for a REST API Link.
+ *
+ * @since 6.7.0
+ *
+ * @param array $link
+ *
+ * @return array|null
+ */
+ protected static function get_target_hints_for_link( $link ) {
+ // Prefer targetHints that were specifically designated by the developer.
+ if ( isset( $link['targetHints']['allow'] ) ) {
+ return null;
+ }
+
+ $request = WP_REST_Request::from_url( $link['href'] );
+ if ( ! $request ) {
+ return null;
+ }
+
+ $server = rest_get_server();
+ $match = $server->match_request_to_handler( $request );
+
+ if ( is_wp_error( $match ) ) {
+ return null;
+ }
+
+ if ( is_wp_error( $request->has_valid_params() ) ) {
+ return null;
+ }
+
+ if ( is_wp_error( $request->sanitize_params() ) ) {
+ return null;
+ }
+
+ $target_hints = array();
+
+ $response = new WP_REST_Response();
+ $response->set_matched_route( $match[0] );
+ $response->set_matched_handler( $match[1] );
+ $headers = rest_send_allow_header( $response, $server, $request )->get_headers();
+
+ foreach ( $headers as $name => $value ) {
+ $name = WP_REST_Request::canonicalize_header_name( $name );
+
+ $target_hints[ $name ] = array_map( 'trim', explode( ',', $value ) );
+ }
+
+ return $target_hints;
+ }
+
+ /**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Retrieves the CURIEs (compact URIs) used for relations.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * Extracts the links from a response into a structured hash, suitable for
</span></span></pre></div>
<a id="trunktestsphpunittestsrestapirestserverphp"></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/rest-api/rest-server.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/rest-api/rest-server.php 2024-09-17 21:31:14 UTC (rev 59031)
+++ trunk/tests/phpunit/tests/rest-api/rest-server.php 2024-09-17 21:50:38 UTC (rev 59032)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -9,6 +9,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> */
</span><span class="cx" style="display: block; padding: 0 10px"> class Tests_REST_Server extends WP_Test_REST_TestCase {
</span><span class="cx" style="display: block; padding: 0 10px"> protected static $icon_id;
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ protected static $admin_id;
+ protected static $post_id;
</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"> * Called before setting up all tests.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -21,12 +23,20 @@
</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"> public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- $filename = DIR_TESTDATA . '/images/test-image-large.jpg';
- self::$icon_id = $factory->attachment->create_upload_object( $filename );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $filename = DIR_TESTDATA . '/images/test-image-large.jpg';
+ self::$icon_id = $factory->attachment->create_upload_object( $filename );
+ self::$admin_id = $factory->user->create(
+ array(
+ 'role' => 'administrator',
+ )
+ );
+ self::$post_id = $factory->post->create();
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> public static function tear_down_after_class() {
</span><span class="cx" style="display: block; padding: 0 10px"> wp_delete_attachment( self::$icon_id, true );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ self::delete_user( self::$admin_id );
+ wp_delete_post( self::$post_id );
</ins><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> parent::tear_down_after_class();
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2431,6 +2441,147 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertSame( '/test-allowed-cors-headers', $mock_hook->get_events()[0]['args'][1]->get_route() );
</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">+ /**
+ * @ticket 61739
+ */
+ public function test_validates_request_when_building_target_hints() {
+ register_rest_route(
+ 'test-ns/v1',
+ '/test/(?P<id>\d+)',
+ array(
+ array(
+ 'methods' => \WP_REST_Server::READABLE,
+ 'callback' => static function () {
+ return new \WP_REST_Response();
+ },
+ 'permission_callback' => '__return_true',
+ 'args' => array(
+ 'id' => array(
+ 'type' => 'integer',
+ ),
+ ),
+ ),
+ )
+ );
+
+ $response = new WP_REST_Response();
+ $response->add_link( 'self', rest_url( 'test-ns/v1/test/garbage' ) );
+
+ $links = rest_get_server()::get_response_links( $response );
+
+ $this->assertArrayHasKey( 'self', $links );
+ $this->assertArrayNotHasKey( 'targetHints', $links['self'][0] );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_sanitizes_request_when_building_target_hints() {
+ $validated_param = null;
+ register_rest_route(
+ 'test-ns/v1',
+ '/test/(?P<id>\d+)',
+ array(
+ array(
+ 'methods' => \WP_REST_Server::READABLE,
+ 'callback' => static function () {
+ return new \WP_REST_Response();
+ },
+ 'permission_callback' => function ( WP_REST_Request $request ) use ( &$validated_param ) {
+ $validated_param = $request['id'];
+
+ return true;
+ },
+ 'args' => array(
+ 'id' => array(
+ 'type' => 'integer',
+ ),
+ ),
+ ),
+ )
+ );
+
+ $response = new WP_REST_Response();
+ $response->add_link( 'self', rest_url( 'test-ns/v1/test/5' ) );
+
+ $links = rest_get_server()::get_response_links( $response );
+
+ $this->assertArrayHasKey( 'self', $links );
+ $this->assertArrayHasKey( 'targetHints', $links['self'][0] );
+ $this->assertIsInt( $validated_param );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_populates_target_hints_for_administrator() {
+ wp_set_current_user( self::$admin_id );
+ $response = rest_do_request( '/wp/v2/posts' );
+ $post = $response->get_data()[0];
+
+ $link = $post['_links']['self'][0];
+ $this->assertArrayHasKey( 'targetHints', $link );
+ $this->assertArrayHasKey( 'allow', $link['targetHints'] );
+ $this->assertSame( array( 'GET', 'POST', 'PUT', 'PATCH', 'DELETE' ), $link['targetHints']['allow'] );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_populates_target_hints_for_logged_out_user() {
+ $response = rest_do_request( '/wp/v2/posts' );
+ $post = $response->get_data()[0];
+
+ $link = $post['_links']['self'][0];
+ $this->assertArrayHasKey( 'targetHints', $link );
+ $this->assertArrayHasKey( 'allow', $link['targetHints'] );
+ $this->assertSame( array( 'GET' ), $link['targetHints']['allow'] );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_does_not_error_on_invalid_urls() {
+ $response = new WP_REST_Response();
+ $response->add_link( 'self', 'this is not a real URL' );
+
+ $links = rest_get_server()::get_response_links( $response );
+ $this->assertArrayNotHasKey( 'targetHints', $links['self'][0] );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_does_not_error_on_bad_rest_api_routes() {
+ $response = new WP_REST_Response();
+ $response->add_link( 'self', rest_url( '/this/is/not/a/real/route' ) );
+
+ $links = rest_get_server()::get_response_links( $response );
+ $this->assertArrayNotHasKey( 'targetHints', $links['self'][0] );
+ }
+
+ /**
+ * @ticket 61739
+ */
+ public function test_prefers_developer_defined_target_hints() {
+ $response = new WP_REST_Response();
+ $response->add_link(
+ 'self',
+ '/wp/v2/posts/' . self::$post_id,
+ array(
+ 'targetHints' => array(
+ 'allow' => array( 'GET', 'PUT' ),
+ ),
+ )
+ );
+
+ $links = rest_get_server()::get_response_links( $response );
+ $link = $links['self'][0];
+ $this->assertArrayHasKey( 'targetHints', $link );
+ $this->assertArrayHasKey( 'allow', $link['targetHints'] );
+ $this->assertSame( array( 'GET', 'PUT' ), $link['targetHints']['allow'] );
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> public function _validate_as_integer_123( $value, $request, $key ) {
</span><span class="cx" style="display: block; padding: 0 10px"> if ( ! is_int( $value ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> return new WP_Error( 'some-error', 'This is not valid!' );
</span></span></pre></div>
<a id="trunktestsqunitfixtureswpapigeneratedjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/qunit/fixtures/wp-api-generated.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/qunit/fixtures/wp-api-generated.js 2024-09-17 21:31:14 UTC (rev 59031)
+++ trunk/tests/qunit/fixtures/wp-api-generated.js 2024-09-17 21:50:38 UTC (rev 59032)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -12334,7 +12334,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/posts/4"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/posts/4",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -12641,7 +12650,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/pages/7"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/pages/7",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -12932,7 +12950,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/media/10"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/media/10",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13629,7 +13656,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/categories/1"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/categories/1",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13694,7 +13729,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/tags/2"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/tags/2",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13758,7 +13802,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/users/1"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/users/1",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13786,7 +13839,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/users/2"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/users/2",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -13859,7 +13921,16 @@
</span><span class="cx" style="display: block; padding: 0 10px"> "_links": {
</span><span class="cx" style="display: block; padding: 0 10px"> "self": [
</span><span class="cx" style="display: block; padding: 0 10px"> {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- "href": "http://example.org/index.php?rest_route=/wp/v2/comments/2"
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ "href": "http://example.org/index.php?rest_route=/wp/v2/comments/2",
+ "targetHints": {
+ "allow": [
+ "GET",
+ "POST",
+ "PUT",
+ "PATCH",
+ "DELETE"
+ ]
+ }
</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"> "collection": [
</span></span></pre>
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