fix: Multi-layer protection against Twig rendering recursion

- Added render depth tracking in Plugin::render() with max depth of 5
- Strip shortcodes from content when in shortcode context
- Prevents any later do_shortcode() calls from triggering recursion

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.4.5] - 2026-02-02
+
+### Fixed
+
+- **Multi-layer recursion protection** - Added additional safeguards against infinite Twig rendering
+  - Added render depth tracking in `Plugin::render()` with max depth of 5
+  - Strip shortcodes from content when in shortcode context (prevents any later `do_shortcode()` calls from triggering recursion)
+  - This addresses the Twig StagingExtension.php recursion error
+
+## [0.4.4] - 2026-02-02
+
+### Fixed
+
+- **Fix excerpt-triggered recursion** - `get_the_excerpt()` internally calls `the_content` filter when generating auto-excerpts
+  - When in shortcode context, now uses raw `$post->post_excerpt` or generates simple excerpt with `wp_trim_words()` instead
+  - This was the remaining recursion path causing memory exhaustion in `class-wp-hook.php`
+
 ## [0.4.3] - 2026-02-02
 
 ### Fixed
@@ -226,7 +243,9 @@ Initial release of WP FediStream - a WordPress plugin for streaming music over A
 
 ---
 
-[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.3...HEAD
+[Unreleased]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.5...HEAD
+[0.4.5]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.4...v0.4.5
+[0.4.4]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.3...v0.4.4
 [0.4.3]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.2...v0.4.3
 [0.4.2]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.1...v0.4.2
 [0.4.1]: https://src.bundespruefstelle.ch/magdev/wp-fedistream/compare/v0.4.0...v0.4.1

includes/Frontend/TemplateLoader.php

@@ -258,11 +258,32 @@ class TemplateLoader {
         // 2. We're at depth > 1 (nested data loading)
         $skip_content_filter = self::$shortcode_context_depth > 0 || self::$recursion_depth > 1;
 
+        // When skipping content filter, also use raw excerpt to avoid get_the_excerpt()
+        // triggering the_content filter internally when generating auto-excerpts.
+        if ( $skip_content_filter ) {
+            $excerpt = $post->post_excerpt;
+            if ( empty( $excerpt ) ) {
+                // Generate a simple excerpt without triggering the_content filter.
+                $excerpt = wp_trim_words( wp_strip_all_tags( $post->post_content ), 55, '…' );
+            }
+        } else {
+            $excerpt = get_the_excerpt( $post );
+        }
+
+        // When skipping content filter, also strip shortcodes to prevent them from
+        // being processed by anything else that might call do_shortcode on the output.
+        if ( $skip_content_filter ) {
+            $content = strip_shortcodes( $post->post_content );
+            $content = wp_kses_post( $content );
+        } else {
+            $content = apply_filters( 'the_content', $post->post_content );
+        }
+
         $data = array(
             'id'        => $post->ID,
             'title'     => get_the_title( $post ),
-            'content'   => $skip_content_filter ? wp_kses_post( $post->post_content ) : apply_filters( 'the_content', $post->post_content ),
-            'excerpt'   => get_the_excerpt( $post ),
+            'content'   => $content,
+            'excerpt'   => $excerpt,
             'permalink' => get_permalink( $post ),
             'thumbnail' => get_the_post_thumbnail_url( $post->ID, 'large' ),
             'date'      => get_the_date( '', $post ),

includes/Plugin.php

@@ -55,6 +55,20 @@ final class Plugin {
      */
     private ?\Twig\Environment $twig = null;
 
+    /**
+     * Current Twig render depth to prevent infinite recursion.
+     *
+     * @var int
+     */
+    private static int $render_depth = 0;
+
+    /**
+     * Maximum allowed Twig render depth.
+     *
+     * @var int
+     */
+    private const MAX_RENDER_DEPTH = 5;
+
     /**
      * Post type instances.
      *
@@ -843,7 +857,20 @@ final class Plugin {
      * @return string Rendered template.
      */
     public function render( string $template, array $context = array() ): string {
-        return $this->twig->render( $template . '.twig', $context );
+        // Prevent infinite recursion in Twig rendering.
+        if ( self::$render_depth >= self::MAX_RENDER_DEPTH ) {
+            return '<!-- FediStream: render depth exceeded -->';
+        }
+
+        ++self::$render_depth;
+
+        try {
+            $result = $this->twig->render( $template . '.twig', $context );
+        } finally {
+            --self::$render_depth;
+        }
+
+        return $result;
     }
 
     /**

wp-fedistream.php

@@ -3,7 +3,7 @@
  * Plugin Name: WP FediStream
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wp-fedistream
  * Description: Stream music over ActivityPub - Build your own music streaming platform for Musicians and Labels.
- * Version: 0.4.3
+ * Version: 0.4.5
  * Requires at least: 6.4
  * Requires PHP: 8.3
  * Author: Marco Graetsch
@@ -26,7 +26,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @var string
  */
-define( 'WP_FEDISTREAM_VERSION', '0.4.3' );
+define( 'WP_FEDISTREAM_VERSION', '0.4.5' );
 
 /**
  * Plugin file path.