feat: Divi read tools accept library entries (library access, E1/E3)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/Abilities/ExposurePolicy.php

@@ -181,6 +181,15 @@ final class ExposurePolicy
         return isset($this->readonlyGroups[$group]);
     }
 
+    /**
+     * Whether $group is switched on at all: not disabled as a whole ("nur lesen" still reads). The
+     * group "Divi-Bibliothek" disabled hides library entries from the Divi read tools (ruling P9).
+     */
+    public function groupEnabled(string $group): bool
+    {
+        return $this->groupMode($group) !== self::DISABLED;
+    }
+
     public function defaultMode(Ability $ability): string
     {
         return $ability->isDirect() ? self::DIRECT : self::INDIRECT;

src/Integrations/Divi/DiviIntegration.php

@@ -6,8 +6,12 @@ namespace LIT\MCP\Integrations\Divi;
 
 use Closure;
 use LIT\MCP\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\Divi\BlockTree\Parser;
 use LIT\MCP\Integrations\Divi\Design\DesignSystemReader;
 use LIT\MCP\Integrations\Divi\Design\DiviDesignSystemAbility;
+use LIT\MCP\Integrations\Divi\Library\DiviLibraryStore;
+use LIT\MCP\Integrations\Divi\Library\DiviRoles;
+use LIT\MCP\Integrations\Divi\Library\LibraryAccess;
 use LIT\MCP\Integrations\Divi\Pages\DiviComposition;
 use LIT\MCP\Integrations\Divi\Pages\DiviContentComposer;
 use LIT\MCP\Integrations\Divi\Pages\DiviDeleteAbility;
@@ -39,11 +43,23 @@ final class DiviIntegration implements Integration
 {
     private DiviModules $modules;
     private DesignSystemReader $design;
+    private LibraryAccess $access;
 
-    public function __construct(private ContentSchema $schema, private ChangeLog $log)
-    {
+    /**
+     * @param (Closure(): bool)|null $libraryWritable Tools-tab gate for writes to library entries
+     *        (group "Divi-Bibliothek" writable); null = always.
+     * @param (Closure(): bool)|null $libraryVisible Tools-tab gate for library entries at all (group
+     *        "Divi-Bibliothek" not disabled, ruling P9); null = always.
+     */
+    public function __construct(
+        private ContentSchema $schema,
+        private ChangeLog $log,
+        ?Closure $libraryWritable = null,
+        ?Closure $libraryVisible = null
+    ) {
         $this->modules = new DiviModules();
         $this->design = new DesignSystemReader();
+        $this->access = new LibraryAccess(new DiviLibraryStore(), new DiviRoles(), $libraryWritable, $libraryVisible);
     }
 
     public function id(): string
@@ -80,7 +96,7 @@ final class DiviIntegration implements Integration
 
     public function abilities(): array
     {
-        $loader = new DiviPageLoader($this->schema);
+        $loader = new DiviPageLoader($this->schema, new Parser(), $this->access);
         $composition = new DiviComposition($this->modules, $this->design);
         $writer = new DiviWriter($loader, new DiviSaver(), $this->log, $this->design, $composition);
 

src/Integrations/Divi/Library/LibraryAccess.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Integrations\Divi\Library;
+
+use Closure;
+use LIT\MCP\Abilities\Errors;
+use LIT\MCP\Integrations\WordPress\PostGuard;
+use WP_Error;
+use WP_Post;
+
+defined('ABSPATH') || exit;
+
+/**
+ * Rights on Divi Library entries (spec §4.5, E3 – never laxer than Divi): the library at all needs
+ * edit_posts and the Divi role option divi_library; one entry additionally edit_post on it (Divi's
+ * builder routes do not check that, F9). The Divi tools reach library entries only through
+ * item(); every other ID goes on to PostGuard unchanged.
+ * Not final so abilities can be tested with a mock.
+ */
+class LibraryAccess
+{
+    /** Tool group "Divi-Bibliothek" (Tools tab); its switches gate library entries (E9, ruling P9). */
+    public const GROUP = 'divi-library';
+
+    /**
+     * @param (Closure(): bool)|null $writable Whether the Tools tab lets this connection write to the
+     *        library (group "Divi-Bibliothek" not read-only or disabled); null = always.
+     * @param (Closure(): bool)|null $visible Whether library entries exist for this connection at all
+     *        (group "Divi-Bibliothek" not disabled, ruling P9); null = always.
+     */
+    public function __construct(
+        private DiviLibraryStore $store,
+        private DiviRoles $roles,
+        private ?Closure $writable = null,
+        private ?Closure $visible = null
+    ) {
+    }
+
+    public function store(): DiviLibraryStore
+    {
+        return $this->store;
+    }
+
+    public function roles(): DiviRoles
+    {
+        return $this->roles;
+    }
+
+    /**
+     * The library entry $postId after the checks for reading, or their refusal; null when $postId
+     * names no library entry (the caller goes on with PostGuard). With the library hidden (ruling
+     * P9), an entry is refused exactly like an ID that does not exist – before any rights check.
+     */
+    public function item(mixed $postId, bool $forWrite): WP_Post|WP_Error|null
+    {
+        $id = PostGuard::id($postId);
+        $post = $id === null ? null : get_post($id);
+        if (! $post instanceof WP_Post || $post->post_type !== DiviLibraryStore::POST_TYPE) {
+            return null;
+        }
+
+        if ($this->visible !== null && ! ($this->visible)()) {
+            return PostGuard::notFound((int) $post->ID);
+        }
+
+        return $this->canRead($post) ?? $post;
+    }
+
+    /** Listing the library: edit_posts and the Divi role option divi_library. */
+    public function canList(): ?WP_Error
+    {
+        if (! current_user_can('edit_posts')) {
+            return Errors::forbidden('Keine Berechtigung, die Divi-Bibliothek zu nutzen.');
+        }
+
+        return $this->roles->refusal('divi_library');
+    }
+
+    /** Reading one entry: canList() and edit_post on the entry. */
+    public function canRead(WP_Post $item): ?WP_Error
+    {
+        $refusal = $this->canList();
+        if ($refusal !== null) {
+            return $refusal;
+        }
+
+        return current_user_can('edit_post', (int) $item->ID)
+            ? null
+            : Errors::forbidden(sprintf('Keine Berechtigung, Bibliothekseintrag %d zu bearbeiten.', (int) $item->ID));
+    }
+
+    public function isGlobal(WP_Post $item): bool
+    {
+        return $this->store->isGlobal((int) $item->ID);
+    }
+}

src/Integrations/Divi/Pages/DiviPage.php

@@ -21,10 +21,17 @@ final class DiviPage
     public function __construct(
         public readonly WP_Post $post,
         public readonly Document $document,
-        public readonly NodeIndex $index
+        public readonly NodeIndex $index,
+        private bool $libraryItem = false
     ) {
     }
 
+    /** Whether the entry is a Divi Library entry (et_pb_layout), loaded through LibraryAccess. */
+    public function isLibraryItem(): bool
+    {
+        return $this->libraryItem;
+    }
+
     public function treeRev(): string
     {
         return Rev::of((string) $this->post->post_content);
@@ -40,7 +47,10 @@ final class DiviPage
 
     public function editUrl(): string
     {
-        return self::builderUrl($this->post);
+        // A library entry has no public permalink (public: false); Divi's library list opens it here.
+        return $this->libraryItem
+            ? (string) get_edit_post_link($this->post, 'raw')
+            : self::builderUrl($this->post);
     }
 
     /** The entry opened in the Divi Visual Builder – the edit_url of every Divi write (review I-1). */

src/Integrations/Divi/Pages/DiviPageLoader.php

@@ -8,31 +8,45 @@ use LIT\MCP\Abilities\Errors;
 use LIT\MCP\Integrations\Divi\BlockTree\MalformedMarkup;
 use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
 use LIT\MCP\Integrations\Divi\BlockTree\Parser;
+use LIT\MCP\Integrations\Divi\Library\LibraryAccess;
 use LIT\MCP\Integrations\WordPress\PostGuard;
 use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
 use LIT\MCP\Log;
 use WP_Error;
+use WP_Post;
 
 defined('ABSPATH') || exit;
 
 /**
- * Loads an entry for the Divi tools: rights and status via PostGuard (spec §4.5), then the
- * block tree. Divi 4 shortcode content and unbalanced markup are refused with a hint –
- * spec §3.4: Divi 4 content is kept, never edited.
+ * Loads an entry for the Divi tools: Divi Library entries via LibraryAccess (E1/E3), every other
+ * entry with its rights and status via PostGuard (spec §4.5), then the block tree. Divi 4
+ * shortcode content and unbalanced markup are refused with a hint – spec §3.4: Divi 4 content
+ * is kept, never edited.
  */
 final class DiviPageLoader
 {
     public const OUTLINE_HINT = 'Aktuellen Stand mit lit/divi-outline (direkt: lit-divi-outline) neu lesen und die '
         . 'Änderung mit der neuen tree_rev wiederholen.';
 
-    public function __construct(private ContentSchema $schema, private Parser $parser = new Parser())
+    public function __construct(
+        private ContentSchema $schema,
+        private Parser $parser = new Parser(),
+        private ?LibraryAccess $library = null
+    ) {
+    }
+
+    /** The library access the Divi tools use, null when library entries are not reachable. */
+    public function library(): ?LibraryAccess
     {
+        return $this->library;
     }
 
     /** Readers pass $forWrite = false (trashed entries may be read, like lit-content-get). */
     public function load(mixed $postId, bool $forWrite): DiviPage|WP_Error
     {
-        $post = PostGuard::editable($postId, $this->schema, 'post_id', ! $forWrite);
+        // Library entries (E1): only for reading so far, and only with a library access.
+        $item = $forWrite ? null : $this->library?->item($postId, false);
+        $post = $item ?? PostGuard::editable($postId, $this->schema, 'post_id', ! $forWrite);
         if ($post instanceof WP_Error) {
             return $post;
         }
@@ -64,7 +78,7 @@ final class DiviPageLoader
             );
         }
 
-        return new DiviPage($post, $document, NodeIndex::build($document));
+        return new DiviPage($post, $document, NodeIndex::build($document), $item instanceof WP_Post);
     }
 
     /** The entry loaded for writing and checked by writable() – the refusal of either step. */

src/Integrations/WordPress/PostGuard.php

@@ -45,7 +45,7 @@ final class PostGuard
 
         $post = get_post($id);
         if (! $post instanceof WP_Post || ! $schema->isManaged((string) $post->post_type)) {
-            return Errors::notFound(sprintf('Eintrag %d nicht gefunden (oder kein unterstützter Inhaltstyp).', $id));
+            return self::notFound($id);
         }
 
         if (! current_user_can('edit_post', $id)) {
@@ -63,6 +63,12 @@ final class PostGuard
         return $post;
     }
 
+    /** The refusal for an ID that names no entry the tools manage – the same for every such ID. */
+    public static function notFound(int $id): WP_Error
+    {
+        return Errors::notFound(sprintf('Eintrag %d nicht gefunden (oder kein unterstützter Inhaltstyp).', $id));
+    }
+
     /**
      * A scheduled entry whose publication time has passed (WordPress' cron missed it) or is
      * less than a minute away: wp_insert_post() turns "future" into "publish" on any save when

src/Plugin.php

@@ -23,6 +23,7 @@ use LIT\MCP\ChangeLog\ChangeLogInstaller;
 use LIT\MCP\Guides\InstructionsBuilder;
 use LIT\MCP\Integrations\Core\CoreIntegration;
 use LIT\MCP\Integrations\Divi\DiviIntegration;
+use LIT\MCP\Integrations\Divi\Library\LibraryAccess;
 use LIT\MCP\Integrations\IntegrationRegistry;
 use LIT\MCP\Integrations\Media\MediaIntegration;
 use LIT\MCP\Integrations\Pods\PodsFieldSource;
@@ -71,9 +72,13 @@ final class Plugin
         (new ChangeLogCleanup($changeLog, $limits))->register();
 
         $schema = self::contentSchema();
-        $divi = new DiviIntegration($schema, $changeLog);
         $registry = null;
         $policy = null;
+        // Ruling P9: with the group "Divi-Bibliothek" disabled, the Divi tools do not see library entries.
+        $libraryVisible = static function () use (&$policy): bool {
+            return $policy instanceof ExposurePolicy && $policy->groupEnabled(LibraryAccess::GROUP);
+        };
+        $divi = new DiviIntegration($schema, $changeLog, libraryVisible: $libraryVisible);
         // Security M2: content-create's divi input follows lit/divi-insert (asked at execute time,
         // when registry and policy exist), so the Divi group's switches stop every Divi layout write.
         $diviWritable = static function () use (&$registry, &$policy): bool {