Interactivity API - Fix SSR if parsed block changes in a filter.

src/wp-includes/interactivity-api/interactivity-api.php

@@ -57,16 +57,20 @@ function wp_interactivity_process_directives_of_interactive_blocks( array $parse
 			};
 
 			/*
-			 * Uses a priority of 20 to ensure that other filters can add additional
+			 * Uses a priority of 100 to ensure that other filters can add additional
 			 * directives before the processing starts.
 			 */
-			add_filter( 'render_block_' . $block_name, $process_interactive_blocks, 20, 2 );
+			add_filter( 'render_block_' . $block_name, $process_interactive_blocks, 100, 2 );
 		}
 	}
 
 	return $parsed_block;
 }
-add_filter( 'render_block_data', 'wp_interactivity_process_directives_of_interactive_blocks' );
+/*
+ * Uses a priority of 100 to ensure that other filters can add additional attributes to
+ * $parsed_block before the processing starts.
+ */
+add_filter( 'render_block_data', 'wp_interactivity_process_directives_of_interactive_blocks', 100, 1 );
 
 /**
  * Retrieves the main WP_Interactivity_API instance.

tests/phpunit/tests/interactivity-api/wpInteractivityAPIFunctions.php

@@ -308,11 +308,44 @@ public function test_process_directives_only_process_the_root_interactive_blocks
 		';
 		$this->data_wp_test_processor_count = 0;
 		do_blocks( $post_content );
-		$this->assertEquals( 2, $this->data_wp_test_processor_count );
 		unregister_block_type( 'test/custom-directive-block' );
+		$this->assertEquals( 2, $this->data_wp_test_processor_count );
 		$directive_processors->setValue( null, $old_directive_processors );
 	}
 
+	/**
+	 * Tests that directives are server side processing even if the $parsed_block variable is edited by a filter.
+	 *
+	 * @ticket 60743
+	 *
+	 * @covers ::wp_interactivity_process_directives_of_interactive_blocks
+	 */
+	public function test_process_directives_when_block_is_filtered() {
+		register_block_type(
+			'test/custom-directive-block',
+			array(
+				'render_callback' => function () {
+					return '<input data-wp-interactive="nameSpace" ' . wp_interactivity_data_wp_context( array( 'text' => 'test' ) ) . ' data-wp-bind--value="context.text" />';
+				},
+				'supports'        => array(
+					'interactivity' => true,
+				),
+			)
+		);
+		function test_render_block_data( $parsed_block ) {
+			$parsed_block['testKey'] = true;
+			return $parsed_block;
+		}
+		add_filter( 'render_block_data', 'test_render_block_data' );
+		$post_content      = '<!-- wp:test/custom-directive-block /-->';
+		$processed_content = do_blocks( $post_content );
+		$processor         = new WP_HTML_Tag_Processor( $processed_content );
+		$processor->next_tag( array( 'data-wp-interactive' => 'nameSpace' ) );
+		remove_filter( 'render_block_data', 'test_render_block_data' );
+		unregister_block_type( 'test/custom-directive-block' );
+		$this->assertEquals( 'test', $processor->get_attribute( 'value' ) );
+	}
+
 	/**
 	 * Tests that wp_interactivity_data_wp_context function correctly converts different array
 	 * structures to a JSON string.