Updated version and assets for release v25.12.2

Added Id to crowdin config for compatibility with upcoming change to
crowdin CLI process after switch to codeberg

.env.example

@@ -26,6 +26,13 @@ DB_DATABASE=database_database
 DB_USERNAME=database_username
 DB_PASSWORD=database_user_password
 
+# Storage system to use
+# By default files are stored on the local filesystem, with images being placed in
+# public web space so they can be efficiently served directly by the web-server.
+# For other options with different security levels & considerations, refer to:
+# https://www.bookstackapp.com/docs/admin/upload-config/
+STORAGE_TYPE=local
+
 # Mail system to use
 # Can be 'smtp' or 'sendmail'
 MAIL_DRIVER=smtp

.github/translators.txt

@@ -177,7 +177,7 @@ Alexander Predl (Harveyhase68) :: German
 Rem (Rem9000) :: Dutch
 Michał Stelmach (stelmach-web) :: Polish
 arniom :: French
-REMOVED_USER :: French; Dutch; Portuguese, Brazilian; Portuguese; Turkish; 
+REMOVED_USER :: French; German; Dutch; Portuguese, Brazilian; Portuguese; Turkish; 
 林祖年 (contagion) :: Chinese Traditional
 Siamak Guodarzi (siamakgoudarzi88) :: Persian
 Lis Maestrelo (lismtrl) :: Portuguese, Brazilian
@@ -222,7 +222,7 @@ SmokingCrop :: Dutch
 Maciej Lebiest (Szwendacz) :: Polish
 DiscordDigital :: German; German Informal
 Gábor Marton (dodver) :: Hungarian
-Jasell :: Swedish
+Jakob Åsell (Jasell) :: Swedish
 Ghost_chu (ghostchu) :: Chinese Simplified
 Ravid Shachar (ravidshachar) :: Hebrew
 Helga Guchshenskaya (guchshenskaya) :: Russian
@@ -509,3 +509,22 @@ iamwhoiamwhoami :: Swedish
 Grogui :: French
 MrCharlesIII :: Arabic
 David Olsen (dawin) :: Danish
+ltnzr :: French
+Frank Holler (holler.frank) :: German; German Informal
+Korab Arifi (korabidev) :: Albanian
+Petr Husák (petrhusak) :: Czech
+Bernardo Maia (bernardo.bmaia2) :: Portuguese, Brazilian
+Amr (amr3k) :: Arabic
+Tahsin Ahmed (tahsinahmed2012) :: Bengali
+bojan_che :: Serbian (Cyrillic)
+setiawan setiawan (culture.setiawan) :: Indonesian
+Donald Mac Kenzie (kiuman) :: Norwegian Bokmal
+Gabriel Silver (GabrielBSilver) :: Hebrew
+Tomas Darius Davainis (Tomasdd) :: Lithuanian
+CriedHero :: Chinese Simplified
+Henrik (henrik2105) :: Norwegian Bokmal
+FoW (fofwisdom) :: Korean
+serinf-lauza :: French
+Diyan Nikolaev (nikolaev.diyan) :: Bulgarian
+Shadluk Avan (quldosh) :: Uzbek
+Marci (MartonPoto) :: Hungarian

.github/workflows/test-migrations.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        php: ['8.2', '8.3', '8.4']
+        php: ['8.2', '8.3', '8.4', '8.5']
     steps:
       - uses: actions/checkout@v4
 

.github/workflows/test-php.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        php: ['8.2', '8.3', '8.4']
+        php: ['8.2', '8.3', '8.4', '8.5']
     steps:
     - uses: actions/checkout@v4
 

.gitignore

@@ -8,10 +8,10 @@ Homestead.yaml
 .idea
 npm-debug.log
 yarn-error.log
-/public/dist
+/public/dist/*.map
 /public/plugins
-/public/css
-/public/js
+/public/css/*.map
+/public/js/*.map
 /public/bower
 /public/build/
 /public/favicon.ico

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2015-2025, Dan Brown and the BookStack project contributors.
+Copyright (c) 2015-2026, Dan Brown and the BookStack project contributors.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

app/Access/Controllers/OidcController.php

@@ -9,11 +9,9 @@ use Illuminate\Http\Request;
 
 class OidcController extends Controller
 {
-    protected OidcService $oidcService;
-
-    public function __construct(OidcService $oidcService)
-    {
-        $this->oidcService = $oidcService;
+    public function __construct(
+        protected OidcService $oidcService
+    ) {
         $this->middleware('guard:oidc');
     }
 
@@ -30,7 +28,7 @@ class OidcController extends Controller
             return redirect('/login');
         }
 
-        session()->flash('oidc_state', $loginDetails['state']);
+        session()->put('oidc_state', time() . ':' . $loginDetails['state']);
 
         return redirect($loginDetails['url']);
     }
@@ -41,10 +39,16 @@ class OidcController extends Controller
      */
     public function callback(Request $request)
     {
-        $storedState = session()->pull('oidc_state');
         $responseState = $request->query('state');
+        $splitState =  explode(':', session()->pull('oidc_state', ':'), 2);
+        if (count($splitState) !== 2) {
+            $splitState = [null, null];
+        }
 
-        if ($storedState !== $responseState) {
+        [$storedStateTime, $storedState] = $splitState;
+        $threeMinutesAgo = time() - 3 * 60;
+
+        if (!$storedState || $storedState !== $responseState || intval($storedStateTime) < $threeMinutesAgo) {
             $this->showErrorNotification(trans('errors.oidc_fail_authed', ['system' => config('oidc.name')]));
 
             return redirect('/login');
@@ -62,7 +66,7 @@ class OidcController extends Controller
     }
 
     /**
-     * Log the user out then start the OIDC RP-initiated logout process.
+     * Log the user out, then start the OIDC RP-initiated logout process.
      */
     public function logout()
     {

app/Access/Mfa/MfaSession.php

@@ -11,7 +11,6 @@ class MfaSession
      */
     public function isRequiredForUser(User $user): bool
     {
-        // TODO - Test both these cases
         return $user->mfaValues()->exists() || $this->userRoleEnforcesMfa($user);
     }
 

app/Access/Mfa/MfaValue.php

@@ -4,6 +4,7 @@ namespace BookStack\Access\Mfa;
 
 use BookStack\Users\Models\User;
 use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
 /**
@@ -16,6 +17,8 @@ use Illuminate\Database\Eloquent\Model;
  */
 class MfaValue extends Model
 {
+    use HasFactory;
+
     protected static $unguarded = true;
 
     const METHOD_TOTP = 'totp';

app/Access/Mfa/TotpService.php

@@ -14,10 +14,9 @@ use PragmaRX\Google2FA\Support\Constants;
 
 class TotpService
 {
-    protected $google2fa;
-
-    public function __construct(Google2FA $google2fa)
-    {
+    public function __construct(
+        protected Google2FA $google2fa
+    ) {
         $this->google2fa = $google2fa;
         // Use SHA1 as a default, Personal testing of other options in 2021 found
         // many apps lack support for other algorithms yet still will scan
@@ -35,7 +34,7 @@ class TotpService
     }
 
     /**
-     * Generate a TOTP URL from secret key.
+     * Generate a TOTP URL from a secret key.
      */
     public function generateUrl(string $secret, User $user): string
     {

app/Access/SocialAccount.php

@@ -5,18 +5,23 @@ namespace BookStack\Access;
 use BookStack\Activity\Models\Loggable;
 use BookStack\App\Model;
 use BookStack\Users\Models\User;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
- * Class SocialAccount.
- *
  * @property string $driver
  * @property User   $user
  */
 class SocialAccount extends Model implements Loggable
 {
-    protected $fillable = ['user_id', 'driver', 'driver_id', 'timestamps'];
+    use HasFactory;
 
-    public function user()
+    protected $fillable = ['user_id', 'driver', 'driver_id'];
+
+    /**
+     * @return BelongsTo<User, $this>
+     */
+    public function user(): BelongsTo
     {
         return $this->belongsTo(User::class);
     }

app/Activity/CommentRepo.php

@@ -4,10 +4,11 @@ namespace BookStack\Activity;
 
 use BookStack\Activity\Models\Comment;
 use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\Page;
 use BookStack\Exceptions\NotifyException;
-use BookStack\Exceptions\PrettyException;
 use BookStack\Facades\Activity as ActivityService;
 use BookStack\Util\HtmlDescriptionFilter;
+use Illuminate\Database\Eloquent\Builder;
 
 class CommentRepo
 {
@@ -19,11 +20,46 @@ class CommentRepo
         return Comment::query()->findOrFail($id);
     }
 
+    /**
+     * Get a comment by ID, ensuring it is visible to the user based upon access to the page
+     * which the comment is attached to.
+     */
+    public function getVisibleById(int $id): Comment
+    {
+        return $this->getQueryForVisible()->findOrFail($id);
+    }
+
+    /**
+     * Start a query for comments visible to the user.
+     * @return Builder<Comment>
+     */
+    public function getQueryForVisible(): Builder
+    {
+        return Comment::query()->scopes('visible');
+    }
+
     /**
      * Create a new comment on an entity.
      */
     public function create(Entity $entity, string $html, ?int $parentId, string $contentRef): Comment
     {
+        // Prevent comments being added to draft pages
+        if ($entity instanceof Page && $entity->draft) {
+            throw new \Exception(trans('errors.cannot_add_comment_to_draft'));
+        }
+
+        // Validate parent ID
+        if ($parentId !== null) {
+            $parentCommentExists = Comment::query()
+                ->where('commentable_id', '=', $entity->id)
+                ->where('commentable_type', '=', $entity->getMorphClass())
+                ->where('local_id', '=', $parentId)
+                ->exists();
+            if (!$parentCommentExists) {
+                $parentId = null;
+            }
+        }
+
         $userId = user()->id;
         $comment = new Comment();
 
@@ -38,6 +74,7 @@ class CommentRepo
         ActivityService::add(ActivityType::COMMENT_CREATE, $comment);
         ActivityService::add(ActivityType::COMMENTED_ON, $entity);
 
+        $comment->refresh()->unsetRelations();
         return $comment;
     }
 
@@ -59,7 +96,7 @@ class CommentRepo
     /**
      * Archive an existing comment.
      */
-    public function archive(Comment $comment): Comment
+    public function archive(Comment $comment, bool $log = true): Comment
     {
         if ($comment->parent_id) {
             throw new NotifyException('Only top-level comments can be archived.', '/', 400);
@@ -68,7 +105,9 @@ class CommentRepo
         $comment->archived = true;
         $comment->save();
 
-        ActivityService::add(ActivityType::COMMENT_UPDATE, $comment);
+        if ($log) {
+            ActivityService::add(ActivityType::COMMENT_UPDATE, $comment);
+        }
 
         return $comment;
     }
@@ -76,7 +115,7 @@ class CommentRepo
     /**
      * Un-archive an existing comment.
      */
-    public function unarchive(Comment $comment): Comment
+    public function unarchive(Comment $comment, bool $log = true): Comment
     {
         if ($comment->parent_id) {
             throw new NotifyException('Only top-level comments can be un-archived.', '/', 400);
@@ -85,7 +124,9 @@ class CommentRepo
         $comment->archived = false;
         $comment->save();
 
-        ActivityService::add(ActivityType::COMMENT_UPDATE, $comment);
+        if ($log) {
+            ActivityService::add(ActivityType::COMMENT_UPDATE, $comment);
+        }
 
         return $comment;
     }

app/Activity/Controllers/CommentApiController.php

@@ -0,0 +1,148 @@
+<?php
+
+declare(strict_types=1);
+
+namespace BookStack\Activity\Controllers;
+
+use BookStack\Activity\CommentRepo;
+use BookStack\Activity\Models\Comment;
+use BookStack\Entities\Queries\PageQueries;
+use BookStack\Http\ApiController;
+use BookStack\Permissions\Permission;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+
+/**
+ * The comment data model has a 'local_id' property, which is a unique integer ID
+ * scoped to the page which the comment is on. The 'parent_id' is used for replies
+ * and refers to the 'local_id' of the parent comment on the same page, not the main
+ * globally unique 'id'.
+ *
+ * If you want to get all comments for a page in a tree-like structure, as reflected in
+ * the UI, then that is provided on pages-read API responses.
+ */
+class CommentApiController extends ApiController
+{
+    protected array $rules = [
+        'create' => [
+            'page_id' => ['required', 'integer'],
+            'reply_to' => ['nullable', 'integer'],
+            'html' => ['required', 'string'],
+            'content_ref' => ['string'],
+        ],
+        'update' => [
+            'html' => ['string'],
+            'archived' => ['boolean'],
+        ]
+    ];
+
+    public function __construct(
+        protected CommentRepo $commentRepo,
+        protected PageQueries $pageQueries,
+    ) {
+    }
+
+    /**
+     * Get a listing of comments visible to the user.
+     */
+    public function list(): JsonResponse
+    {
+        $query = $this->commentRepo->getQueryForVisible();
+
+        return $this->apiListingResponse($query, [
+            'id', 'commentable_id', 'commentable_type', 'parent_id', 'local_id', 'content_ref', 'created_by', 'updated_by', 'created_at', 'updated_at'
+        ]);
+    }
+
+    /**
+     * Create a new comment on a page.
+     * If commenting as a reply to an existing comment, the 'reply_to' parameter
+     * should be provided, set to the 'local_id' of the comment being replied to.
+     */
+    public function create(Request $request): JsonResponse
+    {
+        $this->checkPermission(Permission::CommentCreateAll);
+
+        $input = $this->validate($request, $this->rules()['create']);
+        $page = $this->pageQueries->findVisibleByIdOrFail($input['page_id']);
+
+        $comment = $this->commentRepo->create(
+            $page,
+            $input['html'],
+            $input['reply_to'] ?? null,
+            $input['content_ref'] ?? '',
+        );
+
+        return response()->json($comment);
+    }
+
+    /**
+     * Read the details of a single comment, along with its direct replies.
+     */
+    public function read(string $id): JsonResponse
+    {
+        $comment = $this->commentRepo->getVisibleById(intval($id));
+        $comment->load('createdBy', 'updatedBy');
+
+        $replies = $this->commentRepo->getQueryForVisible()
+            ->where('parent_id', '=', $comment->local_id)
+            ->where('commentable_id', '=', $comment->commentable_id)
+            ->where('commentable_type', '=', $comment->commentable_type)
+            ->get();
+
+        /** @var Comment[] $toProcess */
+        $toProcess = [$comment, ...$replies];
+        foreach ($toProcess as $commentToProcess) {
+            $commentToProcess->setAttribute('html', $commentToProcess->safeHtml());
+            $commentToProcess->makeVisible('html');
+        }
+
+        $comment->setRelation('replies', $replies);
+
+        return response()->json($comment);
+    }
+
+
+    /**
+     * Update the content or archived status of an existing comment.
+     *
+     * Only provide a new archived status if needing to actively change the archive state.
+     * Only top-level comments (non-replies) can be archived or unarchived.
+     */
+    public function update(Request $request, string $id): JsonResponse
+    {
+        $comment = $this->commentRepo->getVisibleById(intval($id));
+        $this->checkOwnablePermission(Permission::CommentUpdate, $comment);
+
+        $input = $this->validate($request, $this->rules()['update']);
+        $hasHtml = isset($input['html']);
+
+        if (isset($input['archived'])) {
+            if ($input['archived']) {
+                $this->commentRepo->archive($comment, !$hasHtml);
+            } else {
+                $this->commentRepo->unarchive($comment, !$hasHtml);
+            }
+        }
+
+        if ($hasHtml) {
+            $comment = $this->commentRepo->update($comment, $input['html']);
+        }
+
+        return response()->json($comment);
+    }
+
+    /**
+     * Delete a single comment from the system.
+     */
+    public function delete(string $id): Response
+    {
+        $comment = $this->commentRepo->getVisibleById(intval($id));
+        $this->checkOwnablePermission(Permission::CommentDelete, $comment);
+
+        $this->commentRepo->delete($comment);
+
+        return response('', 204);
+    }
+}

app/Activity/Controllers/CommentController.php

@@ -22,7 +22,7 @@ class CommentController extends Controller
     /**
      * Save a new comment for a Page.
      *
-     * @throws ValidationException
+     * @throws ValidationException|\Exception
      */
     public function savePageComment(Request $request, int $pageId)
     {
@@ -37,11 +37,6 @@ class CommentController extends Controller
             return response('Not found', 404);
         }
 
-        // Prevent adding comments to draft pages
-        if ($page->draft) {
-            return $this->jsonError(trans('errors.cannot_add_comment_to_draft'), 400);
-        }
-
         // Create a new comment.
         $this->checkPermission(Permission::CommentCreateAll);
         $contentRef = $input['content_ref'] ?? '';

app/Activity/Models/Activity.php

@@ -6,6 +6,7 @@ use BookStack\App\Model;
 use BookStack\Entities\Models\Entity;
 use BookStack\Permissions\Models\JointPermission;
 use BookStack\Users\Models\User;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
@@ -24,6 +25,8 @@ use Illuminate\Support\Str;
  */
 class Activity extends Model
 {
+    use HasFactory;
+
     /**
      * Get the loggable model related to this activity.
      * Currently only used for entities (previously entity_[id/type] columns).

app/Activity/Models/Comment.php

@@ -3,22 +3,24 @@
 namespace BookStack\Activity\Models;
 
 use BookStack\App\Model;
+use BookStack\Permissions\Models\JointPermission;
+use BookStack\Permissions\PermissionApplicator;
 use BookStack\Users\Models\HasCreatorAndUpdater;
 use BookStack\Users\Models\OwnableInterface;
-use BookStack\Users\Models\User;
 use BookStack\Util\HtmlContentFilter;
+use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
 
 /**
  * @property int      $id
- * @property string   $text - Deprecated & now unused (#4821)
  * @property string   $html
  * @property int|null $parent_id  - Relates to local_id, not id
  * @property int      $local_id
- * @property string   $entity_type
- * @property int      $entity_id
+ * @property string   $commentable_type
+ * @property int      $commentable_id
  * @property string   $content_ref
  * @property bool     $archived
  */
@@ -28,13 +30,30 @@ class Comment extends Model implements Loggable, OwnableInterface
     use HasCreatorAndUpdater;
 
     protected $fillable = ['parent_id'];
+    protected $hidden = ['html'];
+
+    protected $casts = [
+        'archived' => 'boolean',
+    ];
 
     /**
      * Get the entity that this comment belongs to.
      */
     public function entity(): MorphTo
     {
-        return $this->morphTo('entity');
+        // We specifically define null here to avoid the different name (commentable)
+        // being used by Laravel eager loading instead of the method name, which it was doing
+        // in some scenarios like when deserialized when going through the queue system.
+        // So we instead specify the type and id column names to use.
+        // Related to:
+        // https://github.com/laravel/framework/pull/24815
+        // https://github.com/laravel/framework/issues/27342
+        // https://github.com/laravel/framework/issues/47953
+        // (and probably more)
+
+        // Ultimately, we could just align the method name to 'commentable' but that would be a potential
+        // breaking change and not really worthwhile in a patch due to the risk of creating extra problems.
+        return $this->morphTo(null, 'commentable_type', 'commentable_id');
     }
 
     /**
@@ -44,8 +63,8 @@ class Comment extends Model implements Loggable, OwnableInterface
     public function parent(): BelongsTo
     {
         return $this->belongsTo(Comment::class, 'parent_id', 'local_id', 'parent')
-            ->where('entity_type', '=', $this->entity_type)
-            ->where('entity_id', '=', $this->entity_id);
+            ->where('commentable_type', '=', $this->commentable_type)
+            ->where('commentable_id', '=', $this->commentable_id);
     }
 
     /**
@@ -58,11 +77,27 @@ class Comment extends Model implements Loggable, OwnableInterface
 
     public function logDescriptor(): string
     {
-        return "Comment #{$this->local_id} (ID: {$this->id}) for {$this->entity_type} (ID: {$this->entity_id})";
+        return "Comment #{$this->local_id} (ID: {$this->id}) for {$this->commentable_type} (ID: {$this->commentable_id})";
     }
 
     public function safeHtml(): string
     {
         return HtmlContentFilter::removeScriptsFromHtmlString($this->html ?? '');
     }
+
+    public function jointPermissions(): HasMany
+    {
+        return $this->hasMany(JointPermission::class, 'entity_id', 'commentable_id')
+            ->whereColumn('joint_permissions.entity_type', '=', 'comments.commentable_type');
+    }
+
+    /**
+     * Scope the query to just the comments visible to the user based upon the
+     * user visibility of what has been commented on.
+     */
+    public function scopeVisible(Builder $query): Builder
+    {
+        return app()->make(PermissionApplicator::class)
+            ->restrictEntityRelationQuery($query, 'comments', 'commentable_id', 'commentable_type');
+    }
 }

app/Activity/Models/Favourite.php

@@ -4,11 +4,14 @@ namespace BookStack\Activity\Models;
 
 use BookStack\App\Model;
 use BookStack\Permissions\Models\JointPermission;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
 
 class Favourite extends Model
 {
+    use HasFactory;
+
     protected $fillable = ['user_id'];
 
     /**

app/Activity/Models/MentionHistory.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace BookStack\Activity\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Carbon;
+
+/**
+ * @property int $id
+ * @property string $mentionable_type
+ * @property int $mentionable_id
+ * @property int $from_user_id
+ * @property int $to_user_id
+ * @property Carbon $created_at
+ * @property Carbon $updated_at
+ */
+class MentionHistory extends Model
+{
+    protected $table = 'mention_history';
+}

app/Activity/Models/Watch.php

@@ -5,6 +5,7 @@ namespace BookStack\Activity\Models;
 use BookStack\Activity\WatchLevels;
 use BookStack\Permissions\Models\JointPermission;
 use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
@@ -20,6 +21,8 @@ use Illuminate\Database\Eloquent\Relations\MorphTo;
  */
 class Watch extends Model
 {
+    use HasFactory;
+
     protected $guarded = [];
 
     public function watchable(): MorphTo

app/Activity/Notifications/Handlers/BaseNotificationHandler.php

@@ -20,6 +20,7 @@ abstract class BaseNotificationHandler implements NotificationHandler
     {
         $users = User::query()->whereIn('id', array_unique($userIds))->get();
 
+        /** @var User $user */
         foreach ($users as $user) {
             // Prevent sending to the user that initiated the activity
             if ($user->id === $initiator->id) {

app/Activity/Notifications/Handlers/CommentCreationNotificationHandler.php

@@ -27,7 +27,7 @@ class CommentCreationNotificationHandler extends BaseNotificationHandler
         $watcherIds = $watchers->getWatcherUserIds();
 
         // Page owner if user preferences allow
-        if (!$watchers->isUserIgnoring($page->owned_by) && $page->ownedBy) {
+        if ($page->owned_by && !$watchers->isUserIgnoring($page->owned_by) && $page->ownedBy) {
             $userNotificationPrefs = new UserNotificationPreferences($page->ownedBy);
             if ($userNotificationPrefs->notifyOnOwnPageComments()) {
                 $watcherIds[] = $page->owned_by;
@@ -36,7 +36,7 @@ class CommentCreationNotificationHandler extends BaseNotificationHandler
 
         // Parent comment creator if preferences allow
         $parentComment = $detail->parent()->first();
-        if ($parentComment && !$watchers->isUserIgnoring($parentComment->created_by) && $parentComment->createdBy) {
+        if ($parentComment && $parentComment->created_by && !$watchers->isUserIgnoring($parentComment->created_by) && $parentComment->createdBy) {
             $parentCommenterNotificationsPrefs = new UserNotificationPreferences($parentComment->createdBy);
             if ($parentCommenterNotificationsPrefs->notifyOnCommentReplies()) {
                 $watcherIds[] = $parentComment->created_by;

app/Activity/Notifications/Handlers/CommentMentionNotificationHandler.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace BookStack\Activity\Notifications\Handlers;
+
+use BookStack\Activity\ActivityType;
+use BookStack\Activity\Models\Activity;
+use BookStack\Activity\Models\Comment;
+use BookStack\Activity\Models\Loggable;
+use BookStack\Activity\Models\MentionHistory;
+use BookStack\Activity\Notifications\Messages\CommentMentionNotification;
+use BookStack\Activity\Tools\MentionParser;
+use BookStack\Entities\Models\Page;
+use BookStack\Settings\UserNotificationPreferences;
+use BookStack\Users\Models\User;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Support\Carbon;
+
+class CommentMentionNotificationHandler extends BaseNotificationHandler
+{
+    public function handle(Activity $activity, Loggable|string $detail, User $user): void
+    {
+        if (!($detail instanceof Comment) || !($detail->entity instanceof Page)) {
+            throw new \InvalidArgumentException("Detail for comment mention notifications must be a comment on a page");
+        }
+
+        /** @var Page $page */
+        $page = $detail->entity;
+
+        $parser = new MentionParser();
+        $mentionedUserIds = $parser->parseUserIdsFromHtml($detail->html);
+        $realMentionedUsers = User::whereIn('id', $mentionedUserIds)->get();
+
+        $receivingNotifications = $realMentionedUsers->filter(function (User $user) {
+            $prefs = new UserNotificationPreferences($user);
+            return $prefs->notifyOnCommentMentions();
+        });
+        $receivingNotificationsUserIds = $receivingNotifications->pluck('id')->toArray();
+
+        $userMentionsToLog = $realMentionedUsers;
+
+        // When an edit, we check our history to see if we've already notified the user about this comment before
+        // so that we can filter them out to avoid double notifications.
+        if ($activity->type === ActivityType::COMMENT_UPDATE) {
+            $previouslyNotifiedUserIds = $this->getPreviouslyNotifiedUserIds($detail);
+            $receivingNotificationsUserIds = array_values(array_diff($receivingNotificationsUserIds, $previouslyNotifiedUserIds));
+            $userMentionsToLog = $userMentionsToLog->filter(function (User $user) use ($previouslyNotifiedUserIds) {
+                return !in_array($user->id, $previouslyNotifiedUserIds);
+            });
+        }
+
+        $this->logMentions($userMentionsToLog, $detail, $user);
+        $this->sendNotificationToUserIds(CommentMentionNotification::class, $receivingNotificationsUserIds, $user, $detail, $page);
+    }
+
+    /**
+     * @param Collection<User> $mentionedUsers
+     */
+    protected function logMentions(Collection $mentionedUsers, Comment $comment, User $fromUser): void
+    {
+        $mentions = [];
+        $now = Carbon::now();
+
+        foreach ($mentionedUsers as $mentionedUser) {
+            $mentions[] = [
+                'mentionable_type' => $comment->getMorphClass(),
+                'mentionable_id' => $comment->id,
+                'from_user_id' => $fromUser->id,
+                'to_user_id' => $mentionedUser->id,
+                'created_at' => $now,
+                'updated_at' => $now,
+            ];
+        }
+
+        MentionHistory::query()->insert($mentions);
+    }
+
+    protected function getPreviouslyNotifiedUserIds(Comment $comment): array
+    {
+        return MentionHistory::query()
+            ->where('mentionable_id', $comment->id)
+            ->where('mentionable_type', $comment->getMorphClass())
+            ->pluck('to_user_id')
+            ->toArray();
+    }
+}

app/Activity/Notifications/Handlers/PageUpdateNotificationHandler.php

@@ -39,8 +39,8 @@ class PageUpdateNotificationHandler extends BaseNotificationHandler
         $watchers = new EntityWatchers($detail, WatchLevels::UPDATES);
         $watcherIds = $watchers->getWatcherUserIds();
 
-        // Add page owner if preferences allow
-        if (!$watchers->isUserIgnoring($detail->owned_by) && $detail->ownedBy) {
+        // Add the page owner if preferences allow
+        if ($detail->owned_by && !$watchers->isUserIgnoring($detail->owned_by) && $detail->ownedBy) {
             $userNotificationPrefs = new UserNotificationPreferences($detail->ownedBy);
             if ($userNotificationPrefs->notifyOnOwnPageChanges()) {
                 $watcherIds[] = $detail->owned_by;

app/Activity/Notifications/Messages/CommentMentionNotification.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace BookStack\Activity\Notifications\Messages;
+
+use BookStack\Activity\Models\Comment;
+use BookStack\Activity\Notifications\MessageParts\EntityLinkMessageLine;
+use BookStack\Activity\Notifications\MessageParts\ListMessageLine;
+use BookStack\Entities\Models\Page;
+use BookStack\Users\Models\User;
+use Illuminate\Notifications\Messages\MailMessage;
+
+class CommentMentionNotification extends BaseActivityNotification
+{
+    public function toMail(User $notifiable): MailMessage
+    {
+        /** @var Comment $comment */
+        $comment = $this->detail;
+        /** @var Page $page */
+        $page = $comment->entity;
+
+        $locale = $notifiable->getLocale();
+
+        $listLines = array_filter([
+            $locale->trans('notifications.detail_page_name') => new EntityLinkMessageLine($page),
+            $locale->trans('notifications.detail_page_path') => $this->buildPagePathLine($page, $notifiable),
+            $locale->trans('notifications.detail_commenter') => $this->user->name,
+            $locale->trans('notifications.detail_comment') => strip_tags($comment->html),
+        ]);
+
+        return $this->newMailMessage($locale)
+            ->subject($locale->trans('notifications.comment_mention_subject', ['pageName' => $page->getShortName()]))
+            ->line($locale->trans('notifications.comment_mention_intro', ['appName' => setting('app-name')]))
+            ->line(new ListMessageLine($listLines))
+            ->action($locale->trans('notifications.action_view_comment'), $page->getUrl('#comment' . $comment->local_id))
+            ->line($this->buildReasonFooterLine($locale));
+    }
+}

app/Activity/Notifications/NotificationManager.php

@@ -6,6 +6,7 @@ use BookStack\Activity\ActivityType;
 use BookStack\Activity\Models\Activity;
 use BookStack\Activity\Models\Loggable;
 use BookStack\Activity\Notifications\Handlers\CommentCreationNotificationHandler;
+use BookStack\Activity\Notifications\Handlers\CommentMentionNotificationHandler;
 use BookStack\Activity\Notifications\Handlers\NotificationHandler;
 use BookStack\Activity\Notifications\Handlers\PageCreationNotificationHandler;
 use BookStack\Activity\Notifications\Handlers\PageUpdateNotificationHandler;
@@ -48,5 +49,7 @@ class NotificationManager
         $this->registerHandler(ActivityType::PAGE_CREATE, PageCreationNotificationHandler::class);
         $this->registerHandler(ActivityType::PAGE_UPDATE, PageUpdateNotificationHandler::class);
         $this->registerHandler(ActivityType::COMMENT_CREATE, CommentCreationNotificationHandler::class);
+        $this->registerHandler(ActivityType::COMMENT_CREATE, CommentMentionNotificationHandler::class);
+        $this->registerHandler(ActivityType::COMMENT_UPDATE, CommentMentionNotificationHandler::class);
     }
 }

app/Activity/Tools/CommentTree.php

@@ -13,6 +13,11 @@ class CommentTree
      * @var CommentTreeNode[]
      */
     protected array $tree;
+
+    /**
+     * A linear array of loaded comments.
+     * @var Comment[]
+     */
     protected array $comments;
 
     public function __construct(
@@ -39,7 +44,7 @@ class CommentTree
 
     public function getActive(): array
     {
-        return array_filter($this->tree, fn (CommentTreeNode $node) => !$node->comment->archived);
+        return array_values(array_filter($this->tree, fn (CommentTreeNode $node) => !$node->comment->archived));
     }
 
     public function activeThreadCount(): int
@@ -49,7 +54,7 @@ class CommentTree
 
     public function getArchived(): array
     {
-        return array_filter($this->tree, fn (CommentTreeNode $node) => $node->comment->archived);
+        return array_values(array_filter($this->tree, fn (CommentTreeNode $node) => $node->comment->archived));
     }
 
     public function archivedThreadCount(): int
@@ -79,6 +84,14 @@ class CommentTree
         return false;
     }
 
+    public function loadVisibleHtml(): void
+    {
+        foreach ($this->comments as $comment) {
+            $comment->setAttribute('html', $comment->safeHtml());
+            $comment->makeVisible('html');
+        }
+    }
+
     /**
      * @param Comment[] $comments
      * @return CommentTreeNode[]
@@ -123,6 +136,9 @@ class CommentTree
         return new CommentTreeNode($byId[$id], $depth, $children);
     }
 
+    /**
+     * @return Comment[]
+     */
     protected function loadComments(): array
     {
         if (!$this->enabled()) {

app/Activity/Tools/MentionParser.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace BookStack\Activity\Tools;
+
+use BookStack\Util\HtmlDocument;
+use DOMElement;
+
+class MentionParser
+{
+    public function parseUserIdsFromHtml(string $html): array
+    {
+        $doc = new HtmlDocument($html);
+
+        $ids = [];
+        $mentionLinks = $doc->queryXPath('//a[@data-mention-user-id]');
+
+        foreach ($mentionLinks as $link) {
+            if ($link instanceof DOMElement) {
+                $id = intval($link->getAttribute('data-mention-user-id'));
+                if ($id > 0) {
+                    $ids[] = $id;
+                }
+            }
+        }
+
+        return array_values(array_unique($ids));
+    }
+}

app/Api/ApiDocsGenerator.php

@@ -83,11 +83,19 @@ class ApiDocsGenerator
     protected function loadDetailsFromControllers(Collection $routes): Collection
     {
         return $routes->map(function (array $route) {
+            $class = $this->getReflectionClass($route['controller']);
             $method = $this->getReflectionMethod($route['controller'], $route['controller_method']);
             $comment = $method->getDocComment();
-            $route['description'] = $comment ? $this->parseDescriptionFromMethodComment($comment) : null;
+            $route['description'] = $comment ? $this->parseDescriptionFromDocBlockComment($comment) : null;
             $route['body_params'] = $this->getBodyParamsFromClass($route['controller'], $route['controller_method']);
 
+            // Load class description for the model
+            // Not ideal to have it here on each route, but adding it in a more structured manner would break
+            // docs resulting JSON format and therefore be an API break.
+            // Save refactoring for a more significant set of changes.
+            $classComment = $class->getDocComment();
+            $route['model_description'] = $classComment ? $this->parseDescriptionFromDocBlockComment($classComment) : null;
+
             return $route;
         });
     }
@@ -140,7 +148,7 @@ class ApiDocsGenerator
     /**
      * Parse out the description text from a class method comment.
      */
-    protected function parseDescriptionFromMethodComment(string $comment): string
+    protected function parseDescriptionFromDocBlockComment(string $comment): string
     {
         $matches = [];
         preg_match_all('/^\s*?\*\s?($|((?![\/@\s]).*?))$/m', $comment, $matches);
@@ -155,6 +163,16 @@ class ApiDocsGenerator
      * @throws ReflectionException
      */
     protected function getReflectionMethod(string $className, string $methodName): ReflectionMethod
+    {
+        return $this->getReflectionClass($className)->getMethod($methodName);
+    }
+
+    /**
+     * Get a reflection class from the given class name.
+     *
+     * @throws ReflectionException
+     */
+    protected function getReflectionClass(string $className): ReflectionClass
     {
         $class = $this->reflectionClasses[$className] ?? null;
         if ($class === null) {
@@ -162,7 +180,7 @@ class ApiDocsGenerator
             $this->reflectionClasses[$className] = $class;
         }
 
-        return $class->getMethod($methodName);
+        return $class;
     }
 
     /**

app/App/HomeController.php

@@ -83,7 +83,7 @@ class HomeController extends Controller
         if ($homepageOption === 'bookshelves') {
             $shelves = $this->queries->shelves->visibleForListWithCover()
                 ->orderBy($commonData['listOptions']->getSort(), $commonData['listOptions']->getOrder())
-                ->paginate(18);
+                ->paginate(setting()->getInteger('lists-page-count-shelves', 18, 1, 1000));
             $data = array_merge($commonData, ['shelves' => $shelves]);
 
             return view('home.shelves', $data);
@@ -92,7 +92,7 @@ class HomeController extends Controller
         if ($homepageOption === 'books') {
             $books = $this->queries->books->visibleForListWithCover()
                 ->orderBy($commonData['listOptions']->getSort(), $commonData['listOptions']->getOrder())
-                ->paginate(18);
+                ->paginate(setting()->getInteger('lists-page-count-books', 18, 1, 1000));
             $data = array_merge($commonData, ['books' => $books]);
 
             return view('home.books', $data);

app/App/Providers/AppServiceProvider.php

@@ -3,6 +3,7 @@
 namespace BookStack\App\Providers;
 
 use BookStack\Access\SocialDriverManager;
+use BookStack\Activity\Models\Comment;
 use BookStack\Activity\Tools\ActivityLogger;
 use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Bookshelf;
@@ -73,6 +74,7 @@ class AppServiceProvider extends ServiceProvider
             'book'      => Book::class,
             'chapter'   => Chapter::class,
             'page'      => Page::class,
+            'comment'   => Comment::class,
         ]);
     }
 }

app/App/SluggableInterface.php

@@ -5,11 +5,9 @@ namespace BookStack\App;
 /**
  * Assigned to models that can have slugs.
  * Must have the below properties.
+ *
+ * @property string $slug
  */
 interface SluggableInterface
 {
-    /**
-     * Regenerate the slug for this model.
-     */
-    public function refreshSlug(): string;
 }

app/Config/database.php

@@ -81,7 +81,8 @@ return [
             'strict'         => false,
             'engine'         => null,
             'options'        => extension_loaded('pdo_mysql') ? array_filter([
-                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
+                // @phpstan-ignore class.notFound
+                (PHP_VERSION_ID >= 80500 ? \Pdo\Mysql::ATTR_SSL_CA : \PDO::MYSQL_ATTR_SSL_CA) => env('MYSQL_ATTR_SSL_CA'),
             ]) : [],
         ],
 

app/Config/filesystems.php

@@ -11,7 +11,7 @@
 return [
 
     // Default Filesystem Disk
-    // Options: local, local_secure, s3
+    // Options: local, local_secure, local_secure_restricted, s3
     'default' => env('STORAGE_TYPE', 'local'),
 
     // Filesystem to use specifically for image uploads.

app/Config/setting-defaults.php

@@ -41,6 +41,7 @@ return [
         'bookshelves_view_type' => env('APP_VIEWS_BOOKSHELVES', 'grid'),
         'bookshelf_view_type'   => env('APP_VIEWS_BOOKSHELF', 'grid'),
         'books_view_type'       => env('APP_VIEWS_BOOKS', 'grid'),
+        'notifications#comment-mentions' => true,
     ],
 
 ];

app/Console/Commands/UpdateUrlCommand.php

@@ -45,10 +45,8 @@ class UpdateUrlCommand extends Command
 
         $columnsToUpdateByTable = [
             'attachments' => ['path'],
-            'pages'       => ['html', 'text', 'markdown'],
-            'chapters'    => ['description_html'],
-            'books'       => ['description_html'],
-            'bookshelves' => ['description_html'],
+            'entity_page_data' => ['html', 'text', 'markdown'],
+            'entity_container_data' => ['description_html'],
             'page_revisions' => ['html', 'text', 'markdown'],
             'images'      => ['url'],
             'settings'    => ['value'],

app/Entities/Controllers/BookApiController.php

@@ -58,7 +58,7 @@ class BookApiController extends ApiController
 
     /**
      * View the details of a single book.
-     * The response data will contain 'content' property listing the chapter and pages directly within, in
+     * The response data will contain a 'content' property listing the chapter and pages directly within, in
      * the same structure as you'd see within the BookStack interface when viewing a book. Top-level
      * contents will have a 'type' property to distinguish between pages & chapters.
      */
@@ -122,9 +122,10 @@ class BookApiController extends ApiController
         $book = clone $book;
         $book->unsetRelations()->refresh();
 
-        $book->load(['tags', 'cover']);
-        $book->makeVisible('description_html')
-            ->setAttribute('description_html', $book->descriptionHtml());
+        $book->load(['tags']);
+        $book->makeVisible(['cover', 'description_html'])
+            ->setAttribute('description_html', $book->descriptionInfo()->getHtml())
+            ->setAttribute('cover', $book->coverInfo()->getImage());
 
         return $book;
     }

app/Entities/Controllers/BookController.php

@@ -8,6 +8,7 @@ use BookStack\Activity\Models\View;
 use BookStack\Activity\Tools\UserEntityWatchOptions;
 use BookStack\Entities\Queries\BookQueries;
 use BookStack\Entities\Queries\BookshelfQueries;
+use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Entities\Repos\BookRepo;
 use BookStack\Entities\Tools\BookContents;
 use BookStack\Entities\Tools\Cloner;
@@ -31,6 +32,7 @@ class BookController extends Controller
         protected ShelfContext $shelfContext,
         protected BookRepo $bookRepo,
         protected BookQueries $queries,
+        protected EntityQueries $entityQueries,
         protected BookshelfQueries $shelfQueries,
         protected ReferenceFetcher $referenceFetcher,
     ) {
@@ -50,7 +52,7 @@ class BookController extends Controller
 
         $books = $this->queries->visibleForListWithCover()
             ->orderBy($listOptions->getSort(), $listOptions->getOrder())
-            ->paginate(18);
+            ->paginate(setting()->getInteger('lists-page-count-books', 18, 1, 1000));
         $recents = $this->isSignedIn() ? $this->queries->recentlyViewedForCurrentUser()->take(4)->get() : false;
         $popular = $this->queries->popularForList()->take(4)->get();
         $new = $this->queries->visibleForList()->orderBy('created_at', 'desc')->take(4)->get();
@@ -127,7 +129,16 @@ class BookController extends Controller
      */
     public function show(Request $request, ActivityQueries $activities, string $slug)
     {
-        $book = $this->queries->findVisibleBySlugOrFail($slug);
+        try {
+            $book = $this->queries->findVisibleBySlugOrFail($slug);
+        } catch (NotFoundException $exception) {
+            $book = $this->entityQueries->findVisibleByOldSlugs('book', $slug);
+            if (is_null($book)) {
+                throw $exception;
+            }
+            return redirect($book->getUrl());
+        }
+
         $bookChildren = (new BookContents($book))->getTree(true);
         $bookParentShelves = $book->shelves()->scopes('visible')->get();
 

app/Entities/Controllers/BookshelfApiController.php

@@ -116,9 +116,10 @@ class BookshelfApiController extends ApiController
         $shelf = clone $shelf;
         $shelf->unsetRelations()->refresh();
 
-        $shelf->load(['tags', 'cover']);
-        $shelf->makeVisible('description_html')
-            ->setAttribute('description_html', $shelf->descriptionHtml());
+        $shelf->load(['tags']);
+        $shelf->makeVisible(['cover', 'description_html'])
+            ->setAttribute('description_html', $shelf->descriptionInfo()->getHtml())
+            ->setAttribute('cover', $shelf->coverInfo()->getImage());
 
         return $shelf;
     }

app/Entities/Controllers/BookshelfController.php

@@ -6,6 +6,7 @@ use BookStack\Activity\ActivityQueries;
 use BookStack\Activity\Models\View;
 use BookStack\Entities\Queries\BookQueries;
 use BookStack\Entities\Queries\BookshelfQueries;
+use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Entities\Repos\BookshelfRepo;
 use BookStack\Entities\Tools\ShelfContext;
 use BookStack\Exceptions\ImageUploadException;
@@ -23,6 +24,7 @@ class BookshelfController extends Controller
     public function __construct(
         protected BookshelfRepo $shelfRepo,
         protected BookshelfQueries $queries,
+        protected EntityQueries $entityQueries,
         protected BookQueries $bookQueries,
         protected ShelfContext $shelfContext,
         protected ReferenceFetcher $referenceFetcher,
@@ -43,7 +45,7 @@ class BookshelfController extends Controller
 
         $shelves = $this->queries->visibleForListWithCover()
             ->orderBy($listOptions->getSort(), $listOptions->getOrder())
-            ->paginate(18);
+            ->paginate(setting()->getInteger('lists-page-count-shelves', 18, 1, 1000));
         $recents = $this->isSignedIn() ? $this->queries->recentlyViewedForCurrentUser()->get() : false;
         $popular = $this->queries->popularForList()->get();
         $new = $this->queries->visibleForList()
@@ -105,7 +107,16 @@ class BookshelfController extends Controller
      */
     public function show(Request $request, ActivityQueries $activities, string $slug)
     {
-        $shelf = $this->queries->findVisibleBySlugOrFail($slug);
+        try {
+            $shelf = $this->queries->findVisibleBySlugOrFail($slug);
+        } catch (NotFoundException $exception) {
+            $shelf = $this->entityQueries->findVisibleByOldSlugs('bookshelf', $slug);
+            if (is_null($shelf)) {
+                throw $exception;
+            }
+            return redirect($shelf->getUrl());
+        }
+
         $this->checkOwnablePermission(Permission::BookshelfView, $shelf);
 
         $listOptions = SimpleListOptions::fromRequest($request, 'shelf_books')->withSortOptions([
@@ -116,6 +127,7 @@ class BookshelfController extends Controller
         ]);
 
         $sort = $listOptions->getSort();
+
         $sortedVisibleShelfBooks = $shelf->visibleBooks()
             ->reorder($sort === 'default' ? 'order' : $sort, $listOptions->getOrder())
             ->get()

app/Entities/Controllers/ChapterApiController.php

@@ -104,7 +104,7 @@ class ChapterApiController extends ApiController
         $chapter = $this->queries->findVisibleByIdOrFail(intval($id));
         $this->checkOwnablePermission(Permission::ChapterUpdate, $chapter);
 
-        if ($request->has('book_id') && $chapter->book_id !== intval($requestData['book_id'])) {
+        if ($request->has('book_id') && $chapter->book_id !== (intval($requestData['book_id']) ?: null)) {
             $this->checkOwnablePermission(Permission::ChapterDelete, $chapter);
 
             try {
@@ -144,7 +144,7 @@ class ChapterApiController extends ApiController
 
         $chapter->load(['tags']);
         $chapter->makeVisible('description_html');
-        $chapter->setAttribute('description_html', $chapter->descriptionHtml());
+        $chapter->setAttribute('description_html', $chapter->descriptionInfo()->getHtml());
 
         /** @var Book $book */
         $book = $chapter->book()->first();

app/Entities/Controllers/ChapterController.php

@@ -77,7 +77,15 @@ class ChapterController extends Controller
      */
     public function show(string $bookSlug, string $chapterSlug)
     {
-        $chapter = $this->queries->findVisibleBySlugsOrFail($bookSlug, $chapterSlug);
+        try {
+            $chapter = $this->queries->findVisibleBySlugsOrFail($bookSlug, $chapterSlug);
+        } catch (NotFoundException $exception) {
+            $chapter = $this->entityQueries->findVisibleByOldSlugs('chapter', $chapterSlug, $bookSlug);
+            if (is_null($chapter)) {
+                throw $exception;
+            }
+            return redirect($chapter->getUrl());
+        }
 
         $sidebarTree = (new BookContents($chapter->book))->getTree();
         $pages = $this->entityQueries->pages->visibleForChapterList($chapter->id)->get();
@@ -130,7 +138,7 @@ class ChapterController extends Controller
         $chapter = $this->queries->findVisibleBySlugsOrFail($bookSlug, $chapterSlug);
         $this->checkOwnablePermission(Permission::ChapterUpdate, $chapter);
 
-        $this->chapterRepo->update($chapter, $validated);
+        $chapter = $this->chapterRepo->update($chapter, $validated);
 
         return redirect($chapter->getUrl());
     }

app/Entities/Controllers/PageApiController.php

@@ -2,6 +2,7 @@
 
 namespace BookStack\Entities\Controllers;
 
+use BookStack\Activity\Tools\CommentTree;
 use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Entities\Queries\PageQueries;
 use BookStack\Entities\Repos\PageRepo;
@@ -88,21 +89,32 @@ class PageApiController extends ApiController
     /**
      * View the details of a single page.
      * Pages will always have HTML content. They may have markdown content
-     * if the markdown editor was used to last update the page.
+     * if the Markdown editor was used to last update the page.
      *
-     * The 'html' property is the fully rendered & escaped HTML content that BookStack
+     * The 'html' property is the fully rendered and escaped HTML content that BookStack
      * would show on page view, with page includes handled.
      * The 'raw_html' property is the direct database stored HTML content, which would be
      * what BookStack shows on page edit.
      *
      * See the "Content Security" section of these docs for security considerations when using
      * the page content returned from this endpoint.
+     *
+     * Comments for the page are provided in a tree-structure representing the hierarchy of top-level
+     * comments and replies, for both archived and active comments.
      */
     public function read(string $id)
     {
         $page = $this->queries->findVisibleByIdOrFail($id);
 
-        return response()->json($page->forJsonDisplay());
+        $page = $page->forJsonDisplay();
+        $commentTree = (new CommentTree($page));
+        $commentTree->loadVisibleHtml();
+        $page->setAttribute('comments', [
+            'active' => $commentTree->getActive(),
+            'archived' => $commentTree->getArchived(),
+        ]);
+
+        return response()->json($page);
     }
 
     /**

app/Entities/Controllers/PageController.php

@@ -17,7 +17,6 @@ use BookStack\Entities\Tools\PageContent;
 use BookStack\Entities\Tools\PageEditActivity;
 use BookStack\Entities\Tools\PageEditorData;
 use BookStack\Exceptions\NotFoundException;
-use BookStack\Exceptions\NotifyException;
 use BookStack\Exceptions\PermissionsException;
 use BookStack\Http\Controller;
 use BookStack\Permissions\Permission;
@@ -120,6 +119,7 @@ class PageController extends Controller
         $this->validate($request, [
             'name' => ['required', 'string', 'max:255'],
         ]);
+
         $draftPage = $this->queries->findVisibleByIdOrFail($pageId);
         $this->checkOwnablePermission(Permission::PageCreate, $draftPage->getParent());
 
@@ -139,9 +139,7 @@ class PageController extends Controller
         try {
             $page = $this->queries->findVisibleBySlugsOrFail($bookSlug, $pageSlug);
         } catch (NotFoundException $e) {
-            $revision = $this->entityQueries->revisions->findLatestVersionBySlugs($bookSlug, $pageSlug);
-            $page = $revision->page ?? null;
-
+            $page = $this->entityQueries->findVisibleByOldSlugs('page', $pageSlug, $bookSlug);
             if (is_null($page)) {
                 throw $e;
             }

app/Entities/EntityExistsRule.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace BookStack\Entities;
+
+use Illuminate\Validation\Rules\Exists;
+
+class EntityExistsRule implements \Stringable
+{
+    public function __construct(
+        protected string $type,
+    ) {
+    }
+
+    public function __toString()
+    {
+        $existsRule = (new Exists('entities', 'id'))
+            ->where('type', $this->type);
+        return $existsRule->__toString();
+    }
+}

app/Entities/Models/Book.php

@@ -2,9 +2,10 @@
 
 namespace BookStack\Entities\Models;
 
+use BookStack\Entities\Tools\EntityCover;
+use BookStack\Entities\Tools\EntityDefaultTemplate;
 use BookStack\Sorting\SortRule;
 use BookStack\Uploads\Image;
-use Exception;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
@@ -15,26 +16,25 @@ use Illuminate\Support\Collection;
  * Class Book.
  *
  * @property string                                   $description
+ * @property string                                   $description_html
  * @property int                                      $image_id
  * @property ?int                                     $default_template_id
  * @property ?int                                     $sort_rule_id
- * @property Image|null                               $cover
  * @property \Illuminate\Database\Eloquent\Collection $chapters
  * @property \Illuminate\Database\Eloquent\Collection $pages
  * @property \Illuminate\Database\Eloquent\Collection $directPages
  * @property \Illuminate\Database\Eloquent\Collection $shelves
- * @property ?Page                                    $defaultTemplate
- * @property ?SortRule                                 $sortRule
+ * @property ?SortRule                                $sortRule
  */
-class Book extends Entity implements CoverImageInterface, HtmlDescriptionInterface
+class Book extends Entity implements HasDescriptionInterface, HasCoverInterface, HasDefaultTemplateInterface
 {
     use HasFactory;
-    use HtmlDescriptionTrait;
+    use ContainerTrait;
 
     public float $searchFactor = 1.2;
 
+    protected $hidden = ['pivot', 'deleted_at', 'description_html', 'entity_id', 'entity_type', 'chapter_id', 'book_id', 'priority'];
     protected $fillable = ['name'];
-    protected $hidden = ['pivot', 'image_id', 'deleted_at', 'description_html'];
 
     /**
      * Get the url for this book.
@@ -44,55 +44,6 @@ class Book extends Entity implements CoverImageInterface, HtmlDescriptionInterfa
         return url('/books/' . implode('/', [urlencode($this->slug), trim($path, '/')]));
     }
 
-    /**
-     * Returns book cover image, if book cover not exists return default cover image.
-     */
-    public function getBookCover(int $width = 440, int $height = 250): string
-    {
-        $default = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
-        if (!$this->image_id || !$this->cover) {
-            return $default;
-        }
-
-        try {
-            return $this->cover->getThumb($width, $height, false) ?? $default;
-        } catch (Exception $err) {
-            return $default;
-        }
-    }
-
-    /**
-     * Get the cover image of the book.
-     */
-    public function cover(): BelongsTo
-    {
-        return $this->belongsTo(Image::class, 'image_id');
-    }
-
-    /**
-     * Get the type of the image model that is used when storing a cover image.
-     */
-    public function coverImageTypeKey(): string
-    {
-        return 'cover_book';
-    }
-
-    /**
-     * Get the Page that is used as default template for newly created pages within this Book.
-     */
-    public function defaultTemplate(): BelongsTo
-    {
-        return $this->belongsTo(Page::class, 'default_template_id');
-    }
-
-    /**
-     * Get the sort set assigned to this book, if existing.
-     */
-    public function sortRule(): BelongsTo
-    {
-        return $this->belongsTo(SortRule::class);
-    }
-
     /**
      * Get all pages within this book.
      * @return HasMany<Page, $this>
@@ -107,7 +58,7 @@ class Book extends Entity implements CoverImageInterface, HtmlDescriptionInterfa
      */
     public function directPages(): HasMany
     {
-        return $this->pages()->where('chapter_id', '=', '0');
+        return $this->pages()->whereNull('chapter_id');
     }
 
     /**
@@ -137,4 +88,27 @@ class Book extends Entity implements CoverImageInterface, HtmlDescriptionInterfa
 
         return $pages->concat($chapters)->sortBy('priority')->sortByDesc('draft');
     }
+
+    public function defaultTemplate(): EntityDefaultTemplate
+    {
+        return new EntityDefaultTemplate($this);
+    }
+
+    public function cover(): BelongsTo
+    {
+        return $this->belongsTo(Image::class, 'image_id');
+    }
+
+    public function coverInfo(): EntityCover
+    {
+        return new EntityCover($this);
+    }
+
+    /**
+     * Get the sort rule assigned to this container, if existing.
+     */
+    public function sortRule(): BelongsTo
+    {
+        return $this->belongsTo(SortRule::class);
+    }
 }

app/Entities/Models/BookChild.php

@@ -2,8 +2,6 @@
 
 namespace BookStack\Entities\Models;
 
-use BookStack\References\ReferenceUpdater;
-use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
@@ -18,34 +16,10 @@ abstract class BookChild extends Entity
 {
     /**
      * Get the book this page sits in.
+     * @return BelongsTo<Book, $this>
      */
     public function book(): BelongsTo
     {
         return $this->belongsTo(Book::class)->withTrashed();
     }
-
-    /**
-     * Change the book that this entity belongs to.
-     */
-    public function changeBook(int $newBookId): Entity
-    {
-        $oldUrl = $this->getUrl();
-        $this->book_id = $newBookId;
-        $this->refreshSlug();
-        $this->save();
-        $this->refresh();
-
-        if ($oldUrl !== $this->getUrl()) {
-            app()->make(ReferenceUpdater::class)->updateEntityReferences($this, $oldUrl);
-        }
-
-        // Update all child pages if a chapter
-        if ($this instanceof Chapter) {
-            foreach ($this->pages()->withTrashed()->get() as $page) {
-                $page->changeBook($newBookId);
-            }
-        }
-
-        return $this;
-    }
 }

app/Entities/Models/Bookshelf.php

@@ -2,34 +2,34 @@
 
 namespace BookStack\Entities\Models;
 
+use BookStack\Entities\Tools\EntityCover;
 use BookStack\Uploads\Image;
-use Exception;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 
-class Bookshelf extends Entity implements CoverImageInterface, HtmlDescriptionInterface
+/**
+ * @property string $description
+ * @property string $description_html
+ */
+class Bookshelf extends Entity implements HasDescriptionInterface, HasCoverInterface
 {
     use HasFactory;
-    use HtmlDescriptionTrait;
-
-    protected $table = 'bookshelves';
+    use ContainerTrait;
 
     public float $searchFactor = 1.2;
 
-    protected $fillable = ['name', 'description', 'image_id'];
-
-    protected $hidden = ['image_id', 'deleted_at', 'description_html'];
+    protected $hidden = ['image_id', 'deleted_at', 'description_html', 'priority', 'default_template_id', 'sort_rule_id', 'entity_id', 'entity_type', 'chapter_id', 'book_id'];
+    protected $fillable = ['name'];
 
     /**
      * Get the books in this shelf.
-     * Should not be used directly since does not take into account permissions.
-     *
-     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
+     * Should not be used directly since it does not take into account permissions.
      */
-    public function books()
+    public function books(): BelongsToMany
     {
         return $this->belongsToMany(Book::class, 'bookshelves_books', 'bookshelf_id', 'book_id')
+            ->select(['entities.*', 'entity_container_data.*'])
             ->withPivot('order')
             ->orderBy('order', 'asc');
     }
@@ -50,41 +50,6 @@ class Bookshelf extends Entity implements CoverImageInterface, HtmlDescriptionIn
         return url('/shelves/' . implode('/', [urlencode($this->slug), trim($path, '/')]));
     }
 
-    /**
-     * Returns shelf cover image, if cover not exists return default cover image.
-     */
-    public function getBookCover(int $width = 440, int $height = 250): string
-    {
-        // TODO - Make generic, focused on books right now, Perhaps set-up a better image
-        $default = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
-        if (!$this->image_id || !$this->cover) {
-            return $default;
-        }
-
-        try {
-            return $this->cover->getThumb($width, $height, false) ?? $default;
-        } catch (Exception $err) {
-            return $default;
-        }
-    }
-
-    /**
-     * Get the cover image of the shelf.
-     * @return BelongsTo<Image, $this>
-     */
-    public function cover(): BelongsTo
-    {
-        return $this->belongsTo(Image::class, 'image_id');
-    }
-
-    /**
-     * Get the type of the image model that is used when storing a cover image.
-     */
-    public function coverImageTypeKey(): string
-    {
-        return 'cover_bookshelf';
-    }
-
     /**
      * Check if this shelf contains the given book.
      */
@@ -96,7 +61,7 @@ class Bookshelf extends Entity implements CoverImageInterface, HtmlDescriptionIn
     /**
      * Add a book to the end of this shelf.
      */
-    public function appendBook(Book $book)
+    public function appendBook(Book $book): void
     {
         if ($this->contains($book)) {
             return;
@@ -106,12 +71,13 @@ class Bookshelf extends Entity implements CoverImageInterface, HtmlDescriptionIn
         $this->books()->attach($book->id, ['order' => $maxOrder + 1]);
     }
 
-    /**
-     * Get a visible shelf by its slug.
-     * @throws \Illuminate\Database\Eloquent\ModelNotFoundException
-     */
-    public static function getBySlug(string $slug): self
+    public function coverInfo(): EntityCover
     {
-        return static::visible()->where('slug', '=', $slug)->firstOrFail();
+        return new EntityCover($this);
+    }
+
+    public function cover(): BelongsTo
+    {
+        return $this->belongsTo(Image::class, 'image_id');
     }
 }

app/Entities/Models/Chapter.php

@@ -2,27 +2,25 @@
 
 namespace BookStack\Entities\Models;
 
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use BookStack\Entities\Tools\EntityDefaultTemplate;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Support\Collection;
 
 /**
- * Class Chapter.
- *
  * @property Collection<Page> $pages
  * @property ?int             $default_template_id
- * @property ?Page            $defaultTemplate
+ * @property string           $description
+ * @property string           $description_html
  */
-class Chapter extends BookChild implements HtmlDescriptionInterface
+class Chapter extends BookChild implements HasDescriptionInterface, HasDefaultTemplateInterface
 {
     use HasFactory;
-    use HtmlDescriptionTrait;
+    use ContainerTrait;
 
     public float $searchFactor = 1.2;
-
-    protected $fillable = ['name', 'description', 'priority'];
-    protected $hidden = ['pivot', 'deleted_at', 'description_html'];
+    protected $hidden = ['pivot', 'deleted_at', 'description_html', 'sort_rule_id', 'image_id', 'entity_id', 'entity_type', 'chapter_id'];
+    protected $fillable = ['name', 'priority'];
 
     /**
      * Get the pages that this chapter contains.
@@ -50,14 +48,6 @@ class Chapter extends BookChild implements HtmlDescriptionInterface
         return url('/' . implode('/', $parts));
     }
 
-    /**
-     * Get the Page that is used as default template for newly created pages within this Chapter.
-     */
-    public function defaultTemplate(): BelongsTo
-    {
-        return $this->belongsTo(Page::class, 'default_template_id');
-    }
-
     /**
      * Get the visible pages in this chapter.
      * @return Collection<Page>
@@ -70,4 +60,9 @@ class Chapter extends BookChild implements HtmlDescriptionInterface
         ->orderBy('priority', 'asc')
         ->get();
     }
+
+    public function defaultTemplate(): EntityDefaultTemplate
+    {
+        return new EntityDefaultTemplate($this);
+    }
 }

app/Entities/Models/ContainerTrait.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\Entities\Tools\EntityHtmlDescription;
+use Illuminate\Database\Eloquent\Relations\HasOne;
+
+/**
+ * @mixin Entity
+ */
+trait ContainerTrait
+{
+    public function descriptionInfo(): EntityHtmlDescription
+    {
+        return new EntityHtmlDescription($this);
+    }
+
+    /**
+     * @return HasOne<EntityContainerData, $this>
+     */
+    public function relatedData(): HasOne
+    {
+        return $this->hasOne(EntityContainerData::class, 'entity_id', 'id')
+            ->where('entity_type', '=', $this->getMorphClass());
+    }
+}

app/Entities/Models/CoverImageInterface.php

@@ -1,18 +0,0 @@
-<?php
-
-namespace BookStack\Entities\Models;
-
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
-
-interface CoverImageInterface
-{
-    /**
-     * Get the cover image for this item.
-     */
-    public function cover(): BelongsTo;
-
-    /**
-     * Get the type of the image model that is used when storing a cover image.
-     */
-    public function coverImageTypeKey(): string;
-}

app/Entities/Models/Deletion.php

@@ -4,6 +4,7 @@ namespace BookStack\Entities\Models;
 
 use BookStack\Activity\Models\Loggable;
 use BookStack\Users\Models\User;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
@@ -17,6 +18,8 @@ use Illuminate\Database\Eloquent\Relations\MorphTo;
  */
 class Deletion extends Model implements Loggable
 {
+    use HasFactory;
+
     protected $hidden = [];
 
     /**

app/Entities/Models/Entity.php

@@ -13,7 +13,6 @@ use BookStack\Activity\Models\Viewable;
 use BookStack\Activity\Models\Watch;
 use BookStack\App\Model;
 use BookStack\App\SluggableInterface;
-use BookStack\Entities\Tools\SlugGenerator;
 use BookStack\Permissions\JointPermissionBuilder;
 use BookStack\Permissions\Models\EntityPermission;
 use BookStack\Permissions\Models\JointPermission;
@@ -28,23 +27,25 @@ use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 use Illuminate\Database\Eloquent\Relations\MorphMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 /**
  * Class Entity
- * The base class for book-like items such as pages, chapters & books.
+ * The base class for book-like items such as pages, chapters and books.
  * This is not a database model in itself but extended.
  *
  * @property int        $id
+ * @property string     $type
  * @property string     $name
  * @property string     $slug
  * @property Carbon     $created_at
  * @property Carbon     $updated_at
  * @property Carbon     $deleted_at
- * @property int        $created_by
- * @property int        $updated_by
- * @property int        $owned_by
+ * @property int|null   $created_by
+ * @property int|null   $updated_by
+ * @property int|null   $owned_by
  * @property Collection $tags
  *
  * @method static Entity|Builder visible()
@@ -77,6 +78,72 @@ abstract class Entity extends Model implements
      */
     public float $searchFactor = 1.0;
 
+    /**
+     * Set the table to be that used by all entities.
+     */
+    protected $table = 'entities';
+
+    /**
+     * Set a custom query builder for entities.
+     */
+    protected static string $builder = EntityQueryBuilder::class;
+
+    public static array $commonFields = [
+        'id',
+        'type',
+        'name',
+        'slug',
+        'book_id',
+        'chapter_id',
+        'priority',
+        'created_at',
+        'updated_at',
+        'deleted_at',
+        'created_by',
+        'updated_by',
+        'owned_by',
+    ];
+
+    /**
+     * Override the save method to also save the contents for convenience.
+     */
+    public function save(array $options = []): bool
+    {
+        /** @var EntityPageData|EntityContainerData $contents */
+        $contents = $this->relatedData()->firstOrNew();
+        $contentFields = $this->getContentsAttributes();
+
+        foreach ($contentFields as $key => $value) {
+            $contents->setAttribute($key, $value);
+            unset($this->attributes[$key]);
+        }
+
+        $this->setAttribute('type', $this->getMorphClass());
+        $result = parent::save($options);
+        $contentsResult = true;
+
+        if ($result && $contents->isDirty()) {
+            $contentsFillData = $contents instanceof EntityPageData ? ['page_id' => $this->id] : ['entity_id' => $this->id, 'entity_type' => $this->getMorphClass()];
+            $contents->forceFill($contentsFillData);
+            $contentsResult = $contents->save();
+            $this->touch();
+        }
+
+        $this->forceFill($contentFields);
+
+        return $result && $contentsResult;
+    }
+
+    /**
+     * Check if this item is a container item.
+     */
+    public function isContainer(): bool
+    {
+        return $this instanceof Bookshelf ||
+            $this instanceof Book ||
+            $this instanceof Chapter;
+    }
+
     /**
      * Get the entities that are visible to the current user.
      */
@@ -91,8 +158,8 @@ abstract class Entity extends Model implements
     public function scopeWithLastView(Builder $query)
     {
         $viewedAtQuery = View::query()->select('updated_at')
-            ->whereColumn('viewable_id', '=', $this->getTable() . '.id')
-            ->where('viewable_type', '=', $this->getMorphClass())
+            ->whereColumn('viewable_id', '=', 'entities.id')
+            ->whereColumn('viewable_type', '=', 'entities.type')
             ->where('user_id', '=', user()->id)
             ->take(1);
 
@@ -102,11 +169,12 @@ abstract class Entity extends Model implements
     /**
      * Query scope to get the total view count of the entities.
      */
-    public function scopeWithViewCount(Builder $query)
+    public function scopeWithViewCount(Builder $query): void
     {
         $viewCountQuery = View::query()->selectRaw('SUM(views) as view_count')
-            ->whereColumn('viewable_id', '=', $this->getTable() . '.id')
-            ->where('viewable_type', '=', $this->getMorphClass())->take(1);
+            ->whereColumn('viewable_id', '=', 'entities.id')
+            ->whereColumn('viewable_type', '=', 'entities.type')
+            ->take(1);
 
         $query->addSelect(['view_count' => $viewCountQuery]);
     }
@@ -162,15 +230,17 @@ abstract class Entity extends Model implements
      */
     public function tags(): MorphMany
     {
-        return $this->morphMany(Tag::class, 'entity')->orderBy('order', 'asc');
+        return $this->morphMany(Tag::class, 'entity')
+            ->orderBy('order', 'asc');
     }
 
     /**
      * Get the comments for an entity.
+     * @return MorphMany<Comment, $this>
      */
     public function comments(bool $orderByCreated = true): MorphMany
     {
-        $query = $this->morphMany(Comment::class, 'entity');
+        $query = $this->morphMany(Comment::class, 'commentable');
 
         return $orderByCreated ? $query->orderBy('created_at', 'asc') : $query;
     }
@@ -184,7 +254,7 @@ abstract class Entity extends Model implements
     }
 
     /**
-     * Get this entities restrictions.
+     * Get this entities assigned permissions.
      */
     public function permissions(): MorphMany
     {
@@ -267,7 +337,7 @@ abstract class Entity extends Model implements
     }
 
     /**
-     * Gets a limited-length version of the entities name.
+     * Gets a limited-length version of the entity name.
      */
     public function getShortName(int $length = 25): string
     {
@@ -334,16 +404,6 @@ abstract class Entity extends Model implements
         app()->make(SearchIndex::class)->indexEntity(clone $this);
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function refreshSlug(): string
-    {
-        $this->slug = app()->make(SlugGenerator::class)->generate($this, $this->name);
-
-        return $this->slug;
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -370,6 +430,14 @@ abstract class Entity extends Model implements
         return $this->morphMany(Watch::class, 'watchable');
     }
 
+    /**
+     * Get the related slug history for this entity.
+     */
+    public function slugHistory(): MorphMany
+    {
+        return $this->morphMany(SlugHistory::class, 'sluggable');
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -377,4 +445,40 @@ abstract class Entity extends Model implements
     {
         return "({$this->id}) {$this->name}";
     }
+
+    /**
+     * @return HasOne<covariant (EntityContainerData|EntityPageData), $this>
+     */
+    abstract public function relatedData(): HasOne;
+
+    /**
+     * Get the attributes that are intended for the related contents model.
+     * @return array<string, mixed>
+     */
+    protected function getContentsAttributes(): array
+    {
+        $contentFields = [];
+        $contentModel = $this instanceof Page ? EntityPageData::class : EntityContainerData::class;
+
+        foreach ($this->attributes as $key => $value) {
+            if (in_array($key, $contentModel::$fields)) {
+                $contentFields[$key] = $value;
+            }
+        }
+
+        return $contentFields;
+    }
+
+    /**
+     * Create a new instance for the given entity type.
+     */
+    public static function instanceFromType(string $type): self
+    {
+        return match ($type) {
+            'page' => new Page(),
+            'chapter' => new Chapter(),
+            'book' => new Book(),
+            'bookshelf' => new Bookshelf(),
+        };
+    }
 }

app/Entities/Models/EntityContainerData.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property int     $entity_id
+ * @property string  $entity_type
+ * @property string  $description
+ * @property string  $description_html
+ * @property ?int    $default_template_id
+ * @property ?int    $image_id
+ * @property ?int    $sort_rule_id
+ */
+class EntityContainerData extends Model
+{
+    public $timestamps = false;
+    protected $primaryKey = 'entity_id';
+    public $incrementing = false;
+
+    public static array $fields = [
+        'description',
+        'description_html',
+        'default_template_id',
+        'image_id',
+        'sort_rule_id',
+    ];
+
+    /**
+     * Override the default set keys for save query method to make it work with composite keys.
+     */
+    public function setKeysForSaveQuery($query): Builder
+    {
+        $query->where($this->getKeyName(), '=', $this->getKeyForSaveQuery())
+            ->where('entity_type', '=', $this->entity_type);
+
+        return $query;
+    }
+
+    /**
+     * Override the default set keys for a select query method to make it work with composite keys.
+     */
+    protected function setKeysForSelectQuery($query): Builder
+    {
+        $query->where($this->getKeyName(), '=', $this->getKeyForSelectQuery())
+            ->where('entity_type', '=', $this->entity_type);
+
+        return $query;
+    }
+}

app/Entities/Models/EntityPageData.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * @property int    $page_id
+ */
+class EntityPageData extends Model
+{
+    public $timestamps = false;
+    protected $primaryKey = 'page_id';
+    public $incrementing = false;
+
+    public static array $fields = [
+        'draft',
+        'template',
+        'revision_count',
+        'editor',
+        'html',
+        'text',
+        'markdown',
+    ];
+}

app/Entities/Models/EntityQueryBuilder.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Query\Builder as QueryBuilder;
+
+class EntityQueryBuilder extends Builder
+{
+    /**
+     * Create a new Eloquent query builder instance.
+     */
+    public function __construct(QueryBuilder $query)
+    {
+        parent::__construct($query);
+
+        $this->withGlobalScope('entity', new EntityScope());
+    }
+
+    public function withoutGlobalScope($scope): static
+    {
+        // Prevent removal of the entity scope
+        if ($scope === 'entity') {
+            return $this;
+        }
+
+        return parent::withoutGlobalScope($scope);
+    }
+
+    /**
+     * Override the default forceDelete method to add type filter onto the query
+     * since it specifically ignores scopes by default.
+     */
+    public function forceDelete()
+    {
+        return $this->query->where('type', '=', $this->model->getMorphClass())->delete();
+    }
+}

app/Entities/Models/EntityScope.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Scope;
+use Illuminate\Database\Query\JoinClause;
+
+class EntityScope implements Scope
+{
+    /**
+     * Apply the scope to a given Eloquent query builder.
+     */
+    public function apply(Builder $builder, Model $model): void
+    {
+        $builder = $builder->where('type', '=', $model->getMorphClass());
+        $table = $model->getTable();
+        if ($model instanceof Page) {
+            $builder->leftJoin('entity_page_data', 'entity_page_data.page_id', '=', "{$table}.id");
+        } else {
+            $builder->leftJoin('entity_container_data', function (JoinClause $join) use ($model, $table) {
+                $join->on('entity_container_data.entity_id', '=', "{$table}.id")
+                    ->where('entity_container_data.entity_type', '=', $model->getMorphClass());
+            });
+        }
+    }
+}

app/Entities/Models/EntityTable.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\Activity\Models\Tag;
+use BookStack\Activity\Models\View;
+use BookStack\App\Model;
+use BookStack\Permissions\Models\EntityPermission;
+use BookStack\Permissions\Models\JointPermission;
+use BookStack\Permissions\PermissionApplicator;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * This is a simplistic model interpretation of a generic Entity used to query and represent
+ * that database abstractly. Generally, this should rarely be used outside queries.
+ */
+class EntityTable extends Model
+{
+    use SoftDeletes;
+
+    protected $table = 'entities';
+
+    /**
+     * Get the entities that are visible to the current user.
+     */
+    public function scopeVisible(Builder $query): Builder
+    {
+        return app()->make(PermissionApplicator::class)->restrictEntityQuery($query);
+    }
+
+    /**
+     * Get the entity jointPermissions this is connected to.
+     */
+    public function jointPermissions(): HasMany
+    {
+        return $this->hasMany(JointPermission::class, 'entity_id')
+            ->whereColumn('entity_type', '=', 'entities.type');
+    }
+
+    /**
+     * Get the Tags that have been assigned to entities.
+     */
+    public function tags(): HasMany
+    {
+        return $this->hasMany(Tag::class, 'entity_id')
+            ->whereColumn('entity_type', '=', 'entities.type');
+    }
+
+    /**
+     * Get the assigned permissions.
+     */
+    public function permissions(): HasMany
+    {
+        return $this->hasMany(EntityPermission::class, 'entity_id')
+            ->whereColumn('entity_type', '=', 'entities.type');
+    }
+
+    /**
+     * Get View objects for this entity.
+     */
+    public function views(): HasMany
+    {
+        return $this->hasMany(View::class, 'viewable_id')
+            ->whereColumn('viewable_type', '=', 'entities.type');
+    }
+}

app/Entities/Models/HasCoverInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\Entities\Tools\EntityCover;
+use BookStack\Uploads\Image;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+interface HasCoverInterface
+{
+    public function coverInfo(): EntityCover;
+
+    /**
+     * The cover image of this entity.
+     * @return BelongsTo<Image, covariant Entity>
+     */
+    public function cover(): BelongsTo;
+}

app/Entities/Models/HasDefaultTemplateInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\Entities\Tools\EntityDefaultTemplate;
+
+interface HasDefaultTemplateInterface
+{
+    public function defaultTemplate(): EntityDefaultTemplate;
+}

app/Entities/Models/HasDescriptionInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\Entities\Tools\EntityHtmlDescription;
+
+interface HasDescriptionInterface
+{
+    public function descriptionInfo(): EntityHtmlDescription;
+}

app/Entities/Models/HtmlDescriptionInterface.php

@@ -1,17 +0,0 @@
-<?php
-
-namespace BookStack\Entities\Models;
-
-interface HtmlDescriptionInterface
-{
-    /**
-     * Get the HTML-based description for this item.
-     * By default, the content should be sanitised unless raw is set to true.
-     */
-    public function descriptionHtml(bool $raw = false): string;
-
-    /**
-     * Set the HTML-based description for this item.
-     */
-    public function setDescriptionHtml(string $html, string|null $plaintext = null): void;
-}

app/Entities/Models/HtmlDescriptionTrait.php

@@ -1,35 +0,0 @@
-<?php
-
-namespace BookStack\Entities\Models;
-
-use BookStack\Util\HtmlContentFilter;
-
-/**
- * @property string $description
- * @property string $description_html
- */
-trait HtmlDescriptionTrait
-{
-    public function descriptionHtml(bool $raw = false): string
-    {
-        $html = $this->description_html ?: '<p>' . nl2br(e($this->description)) . '</p>';
-        if ($raw) {
-            return $html;
-        }
-
-        return HtmlContentFilter::removeScriptsFromHtmlString($html);
-    }
-
-    public function setDescriptionHtml(string $html, string|null $plaintext = null): void
-    {
-        $this->description_html = $html;
-
-        if ($plaintext !== null) {
-            $this->description = $plaintext;
-        }
-
-        if (empty($html) && !empty($plaintext)) {
-            $this->description_html = $this->descriptionHtml();
-        }
-    }
-}

app/Entities/Models/Page.php

@@ -3,7 +3,6 @@
 namespace BookStack\Entities\Models;
 
 use BookStack\Entities\Tools\PageContent;
-use BookStack\Entities\Tools\PageEditorType;
 use BookStack\Permissions\PermissionApplicator;
 use BookStack\Uploads\Attachment;
 use Illuminate\Database\Eloquent\Builder;
@@ -15,7 +14,7 @@ use Illuminate\Database\Eloquent\Relations\HasOne;
 
 /**
  * Class Page.
- *
+ * @property EntityPageData $pageData
  * @property int          $chapter_id
  * @property string       $html
  * @property string       $markdown
@@ -33,12 +32,10 @@ class Page extends BookChild
 {
     use HasFactory;
 
-    protected $fillable = ['name', 'priority'];
-
     public string $textField = 'text';
     public string $htmlField = 'html';
-
-    protected $hidden = ['html', 'markdown', 'text', 'pivot', 'deleted_at'];
+    protected $hidden = ['html', 'markdown', 'text', 'pivot', 'deleted_at',  'entity_id', 'entity_type'];
+    protected $fillable = ['name', 'priority'];
 
     protected $casts = [
         'draft'    => 'boolean',
@@ -57,10 +54,8 @@ class Page extends BookChild
 
     /**
      * Get the chapter that this page is in, If applicable.
-     *
-     * @return BelongsTo
      */
-    public function chapter()
+    public function chapter(): BelongsTo
     {
         return $this->belongsTo(Chapter::class);
     }
@@ -107,10 +102,8 @@ class Page extends BookChild
 
     /**
      * Get the attachments assigned to this page.
-     *
-     * @return HasMany
      */
-    public function attachments()
+    public function attachments(): HasMany
     {
         return $this->hasMany(Attachment::class, 'uploaded_to')->orderBy('order', 'asc');
     }
@@ -131,6 +124,14 @@ class Page extends BookChild
         return url('/' . implode('/', $parts));
     }
 
+    /**
+     * Get the ID-based permalink for this page.
+     */
+    public function getPermalink(): string
+    {
+        return url("/link/{$this->id}");
+    }
+
     /**
      * Get this page for JSON display.
      */
@@ -139,8 +140,16 @@ class Page extends BookChild
         $refreshed = $this->refresh()->unsetRelations()->load(['tags', 'createdBy', 'updatedBy', 'ownedBy']);
         $refreshed->setHidden(array_diff($refreshed->getHidden(), ['html', 'markdown']));
         $refreshed->setAttribute('raw_html', $refreshed->html);
-        $refreshed->html = (new PageContent($refreshed))->render();
+        $refreshed->setAttribute('html', (new PageContent($refreshed))->render());
 
         return $refreshed;
     }
+
+    /**
+     * @return HasOne<EntityPageData, $this>
+     */
+    public function relatedData(): HasOne
+    {
+        return $this->hasOne(EntityPageData::class, 'page_id', 'id');
+    }
 }

app/Entities/Models/PageRevision.php

@@ -6,6 +6,7 @@ use BookStack\Activity\Models\Loggable;
 use BookStack\App\Model;
 use BookStack\Users\Models\User;
 use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
@@ -30,6 +31,8 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
  */
 class PageRevision extends Model implements Loggable
 {
+    use HasFactory;
+
     protected $fillable = ['name', 'text', 'summary'];
     protected $hidden = ['html', 'markdown', 'text'];
 

app/Entities/Models/SlugHistory.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace BookStack\Entities\Models;
+
+use BookStack\App\Model;
+use BookStack\Permissions\Models\JointPermission;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+/**
+ * @property int $id
+ * @property int $sluggable_id
+ * @property string $sluggable_type
+ * @property string $slug
+ * @property ?string $parent_slug
+ */
+class SlugHistory extends Model
+{
+    use HasFactory;
+
+    protected $table = 'slug_history';
+
+    public function jointPermissions(): HasMany
+    {
+        return $this->hasMany(JointPermission::class, 'entity_id', 'sluggable_id')
+            ->whereColumn('joint_permissions.entity_type', '=', 'slug_history.sluggable_type');
+    }
+}

app/Entities/Queries/BookQueries.php

@@ -55,6 +55,11 @@ class BookQueries implements ProvidesEntityQueries
             ->select(static::$listAttributes);
     }
 
+    public function visibleForContent(): Builder
+    {
+        return $this->start()->scopes('visible');
+    }
+
     public function visibleForListWithCover(): Builder
     {
         return $this->visibleForList()->with('cover');

app/Entities/Queries/BookshelfQueries.php

@@ -60,6 +60,11 @@ class BookshelfQueries implements ProvidesEntityQueries
         return $this->start()->scopes('visible')->select(static::$listAttributes);
     }
 
+    public function visibleForContent(): Builder
+    {
+        return $this->start()->scopes('visible');
+    }
+
     public function visibleForListWithCover(): Builder
     {
         return $this->visibleForList()->with('cover');

app/Entities/Queries/ChapterQueries.php

@@ -65,8 +65,14 @@ class ChapterQueries implements ProvidesEntityQueries
             ->scopes('visible')
             ->select(array_merge(static::$listAttributes, ['book_slug' => function ($builder) {
                 $builder->select('slug')
-                    ->from('books')
-                    ->whereColumn('books.id', '=', 'chapters.book_id');
+                    ->from('entities as books')
+                    ->where('type', '=', 'book')
+                    ->whereColumn('books.id', '=', 'entities.book_id');
             }]));
     }
+
+    public function visibleForContent(): Builder
+    {
+        return $this->start()->scopes('visible');
+    }
 }

app/Entities/Queries/EntityQueries.php

@@ -3,7 +3,12 @@
 namespace BookStack\Entities\Queries;
 
 use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\EntityTable;
+use BookStack\Entities\Tools\SlugHistory;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Query\Builder as QueryBuilder;
+use Illuminate\Database\Query\JoinClause;
+use Illuminate\Support\Facades\DB;
 use InvalidArgumentException;
 
 class EntityQueries
@@ -14,6 +19,7 @@ class EntityQueries
         public ChapterQueries $chapters,
         public PageQueries $pages,
         public PageRevisionQueries $revisions,
+        protected SlugHistory $slugHistory,
     ) {
     }
 
@@ -27,9 +33,55 @@ class EntityQueries
         $explodedId = explode(':', $identifier);
         $entityType = $explodedId[0];
         $entityId = intval($explodedId[1]);
-        $queries = $this->getQueriesForType($entityType);
 
-        return $queries->findVisibleById($entityId);
+        return $this->findVisibleById($entityType, $entityId);
+    }
+
+    /**
+     * Find an entity by its ID.
+     */
+    public function findVisibleById(string $type, int $id): ?Entity
+    {
+        $queries = $this->getQueriesForType($type);
+        return $queries->findVisibleById($id);
+    }
+
+    /**
+     * Find an entity by looking up old slugs in the slug history.
+     */
+    public function findVisibleByOldSlugs(string $type, string $slug, string $parentSlug = ''): ?Entity
+    {
+        $id = $this->slugHistory->lookupEntityIdUsingSlugs($type, $slug, $parentSlug);
+        if ($id === null) {
+            return null;
+        }
+
+        return $this->findVisibleById($type, $id);
+    }
+
+    /**
+     * Start a query across all entity types.
+     * Combines the description/text fields into a single 'description' field.
+     * @return Builder<EntityTable>
+     */
+    public function visibleForList(): Builder
+    {
+        $rawDescriptionField = DB::raw('COALESCE(description, text) as description');
+        $bookSlugSelect = function (QueryBuilder $query) {
+            return $query->select('slug')->from('entities as books')
+                ->whereColumn('books.id', '=', 'entities.book_id')
+                ->where('type', '=', 'book');
+        };
+
+        return EntityTable::query()->scopes('visible')
+            ->select(['id', 'type', 'name', 'slug', 'book_id', 'chapter_id', 'created_at', 'updated_at', 'draft', 'book_slug' => $bookSlugSelect, $rawDescriptionField])
+            ->leftJoin('entity_container_data', function (JoinClause $join) {
+                $join->on('entity_container_data.entity_id', '=', 'entities.id')
+                    ->on('entity_container_data.entity_type', '=', 'entities.type');
+            })->leftJoin('entity_page_data', function (JoinClause $join) {
+                $join->on('entity_page_data.page_id', '=', 'entities.id')
+                    ->where('entities.type', '=', 'page');
+            });
     }
 
     /**
@@ -37,12 +89,23 @@ class EntityQueries
      * suitable for listing display.
      * @return Builder<Entity>
      */
-    public function visibleForList(string $entityType): Builder
+    public function visibleForListForType(string $entityType): Builder
     {
         $queries = $this->getQueriesForType($entityType);
         return $queries->visibleForList();
     }
 
+    /**
+     * Start a query of visible entities of the given type,
+     * suitable for using the contents of the items.
+     * @return Builder<Entity>
+     */
+    public function visibleForContentForType(string $entityType): Builder
+    {
+        $queries = $this->getQueriesForType($entityType);
+        return $queries->visibleForContent();
+    }
+
     protected function getQueriesForType(string $type): ProvidesEntityQueries
     {
         $queries = match ($type) {

app/Entities/Queries/PageQueries.php

@@ -13,7 +13,7 @@ class PageQueries implements ProvidesEntityQueries
 {
     protected static array $contentAttributes = [
         'name', 'id', 'slug', 'book_id', 'chapter_id', 'draft',
-        'template', 'html', 'text', 'created_at', 'updated_at', 'priority',
+        'template', 'html', 'markdown', 'text', 'created_at', 'updated_at', 'priority',
         'created_by', 'updated_by', 'owned_by',
     ];
     protected static array $listAttributes = [
@@ -82,6 +82,14 @@ class PageQueries implements ProvidesEntityQueries
             ->select($this->mergeBookSlugForSelect(static::$listAttributes));
     }
 
+    /**
+     * @return Builder<Page>
+     */
+    public function visibleForContent(): Builder
+    {
+        return $this->start()->scopes('visible');
+    }
+
     public function visibleForChapterList(int $chapterId): Builder
     {
         return $this->visibleForList()
@@ -104,18 +112,19 @@ class PageQueries implements ProvidesEntityQueries
             ->where('created_by', '=', user()->id);
     }
 
-    public function visibleTemplates(): Builder
+    public function visibleTemplates(bool $includeContents = false): Builder
     {
-        return $this->visibleForList()
-            ->where('template', '=', true);
+        $base = $includeContents ? $this->visibleWithContents() : $this->visibleForList();
+        return $base->where('template', '=', true);
     }
 
     protected function mergeBookSlugForSelect(array $columns): array
     {
         return array_merge($columns, ['book_slug' => function ($builder) {
             $builder->select('slug')
-                ->from('books')
-                ->whereColumn('books.id', '=', 'pages.book_id');
+                ->from('entities as books')
+                ->where('type', '=', 'book')
+                ->whereColumn('books.id', '=', 'entities.book_id');
         }]);
     }
 }

app/Entities/Queries/ProvidesEntityQueries.php

@@ -35,4 +35,11 @@ interface ProvidesEntityQueries
      * @return Builder<TModel>
      */
     public function visibleForList(): Builder;
+
+    /**
+     * Start a query for items that are visible, with selection
+     * configured for using the content of the items found.
+     * @return Builder<TModel>
+     */
+    public function visibleForContent(): Builder;
 }

app/Entities/Repos/BaseRepo.php

@@ -3,14 +3,13 @@
 namespace BookStack\Entities\Repos;
 
 use BookStack\Activity\TagRepo;
-use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\BookChild;
-use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\HasCoverInterface;
+use BookStack\Entities\Models\HasDescriptionInterface;
 use BookStack\Entities\Models\Entity;
-use BookStack\Entities\Models\CoverImageInterface;
-use BookStack\Entities\Models\HtmlDescriptionInterface;
-use BookStack\Entities\Models\HtmlDescriptionTrait;
 use BookStack\Entities\Queries\PageQueries;
+use BookStack\Entities\Tools\SlugGenerator;
+use BookStack\Entities\Tools\SlugHistory;
 use BookStack\Exceptions\ImageUploadException;
 use BookStack\References\ReferenceStore;
 use BookStack\References\ReferenceUpdater;
@@ -28,22 +27,32 @@ class BaseRepo
         protected ReferenceStore $referenceStore,
         protected PageQueries $pageQueries,
         protected BookSorter $bookSorter,
+        protected SlugGenerator $slugGenerator,
+        protected SlugHistory $slugHistory,
     ) {
     }
 
     /**
      * Create a new entity in the system.
+     * @template T of Entity
+     * @param T $entity
+     * @return T
      */
-    public function create(Entity $entity, array $input)
+    public function create(Entity $entity, array $input): Entity
     {
+        $entity = (clone $entity)->refresh();
         $entity->fill($input);
-        $this->updateDescription($entity, $input);
         $entity->forceFill([
             'created_by' => user()->id,
             'updated_by' => user()->id,
             'owned_by'   => user()->id,
         ]);
-        $entity->refreshSlug();
+        $this->refreshSlug($entity);
+
+        if ($entity instanceof HasDescriptionInterface) {
+            $this->updateDescription($entity, $input);
+        }
+
         $entity->save();
 
         if (isset($input['tags'])) {
@@ -53,22 +62,31 @@ class BaseRepo
         $entity->refresh();
         $entity->rebuildPermissions();
         $entity->indexForSearch();
+
         $this->referenceStore->updateForEntity($entity);
+
+        return $entity;
     }
 
     /**
      * Update the given entity.
+     * @template T of Entity
+     * @param T $entity
+     * @return T
      */
-    public function update(Entity $entity, array $input)
+    public function update(Entity $entity, array $input): Entity
     {
         $oldUrl = $entity->getUrl();
 
         $entity->fill($input);
-        $this->updateDescription($entity, $input);
         $entity->updated_by = user()->id;
 
         if ($entity->isDirty('name') || empty($entity->slug)) {
-            $entity->refreshSlug();
+            $this->refreshSlug($entity);
+        }
+
+        if ($entity instanceof HasDescriptionInterface) {
+            $this->updateDescription($entity, $input);
         }
 
         $entity->save();
@@ -84,59 +102,35 @@ class BaseRepo
         if ($oldUrl !== $entity->getUrl()) {
             $this->referenceUpdater->updateEntityReferences($entity, $oldUrl);
         }
+
+        return $entity;
     }
 
     /**
-     * Update the given items' cover image, or clear it.
+     * Update the given items' cover image or clear it.
      *
      * @throws ImageUploadException
      * @throws \Exception
      */
-    public function updateCoverImage(Entity&CoverImageInterface $entity, ?UploadedFile $coverImage, bool $removeImage = false)
+    public function updateCoverImage(Entity&HasCoverInterface $entity, ?UploadedFile $coverImage, bool $removeImage = false): void
     {
         if ($coverImage) {
-            $imageType = $entity->coverImageTypeKey();
-            $this->imageRepo->destroyImage($entity->cover()->first());
+            $imageType = 'cover_' . $entity->type;
+            $this->imageRepo->destroyImage($entity->coverInfo()->getImage());
             $image = $this->imageRepo->saveNew($coverImage, $imageType, $entity->id, 512, 512, true);
-            $entity->cover()->associate($image);
+            $entity->coverInfo()->setImage($image);
             $entity->save();
         }
 
         if ($removeImage) {
-            $this->imageRepo->destroyImage($entity->cover()->first());
-            $entity->cover()->dissociate();
+            $this->imageRepo->destroyImage($entity->coverInfo()->getImage());
+            $entity->coverInfo()->setImage(null);
             $entity->save();
         }
     }
 
     /**
-     * Update the default page template used for this item.
-     * Checks that, if changing, the provided value is a valid template and the user
-     * has visibility of the provided page template id.
-     */
-    public function updateDefaultTemplate(Book|Chapter $entity, int $templateId): void
-    {
-        $changing = $templateId !== intval($entity->default_template_id);
-        if (!$changing) {
-            return;
-        }
-
-        if ($templateId === 0) {
-            $entity->default_template_id = null;
-            $entity->save();
-            return;
-        }
-
-        $templateExists = $this->pageQueries->visibleTemplates()
-            ->where('id', '=', $templateId)
-            ->exists();
-
-        $entity->default_template_id = $templateExists ? $templateId : null;
-        $entity->save();
-    }
-
-    /**
-     * Sort the parent of the given entity, if any auto sort actions are set for it.
+     * Sort the parent of the given entity if any auto sort actions are set for it.
      * Typically ran during create/update/insert events.
      */
     public function sortParent(Entity $entity): void
@@ -147,19 +141,31 @@ class BaseRepo
         }
     }
 
+    /**
+     * Update the description of the given entity from input data.
+     */
     protected function updateDescription(Entity $entity, array $input): void
     {
-        if (!($entity instanceof HtmlDescriptionInterface)) {
+        if (!$entity instanceof HasDescriptionInterface) {
             return;
         }
 
         if (isset($input['description_html'])) {
-            $entity->setDescriptionHtml(
+            $entity->descriptionInfo()->set(
                 HtmlDescriptionFilter::filterFromString($input['description_html']),
                 html_entity_decode(strip_tags($input['description_html']))
             );
         } else if (isset($input['description'])) {
-            $entity->setDescriptionHtml('', $input['description']);
+            $entity->descriptionInfo()->set('', $input['description']);
         }
     }
+
+    /**
+     * Refresh the slug for the given entity.
+     */
+    public function refreshSlug(Entity $entity): void
+    {
+        $this->slugHistory->recordForEntity($entity);
+        $this->slugGenerator->regenerateForEntity($entity);
+    }
 }

app/Entities/Repos/BookRepo.php

@@ -30,19 +30,18 @@ class BookRepo
     public function create(array $input): Book
     {
         return (new DatabaseTransaction(function () use ($input) {
-            $book = new Book();
-
-            $this->baseRepo->create($book, $input);
+            $book = $this->baseRepo->create(new Book(), $input);
             $this->baseRepo->updateCoverImage($book, $input['image'] ?? null);
-            $this->baseRepo->updateDefaultTemplate($book, intval($input['default_template_id'] ?? null));
+            $book->defaultTemplate()->setFromId(intval($input['default_template_id'] ?? null));
             Activity::add(ActivityType::BOOK_CREATE, $book);
 
             $defaultBookSortSetting = intval(setting('sorting-book-default', '0'));
             if ($defaultBookSortSetting && SortRule::query()->find($defaultBookSortSetting)) {
                 $book->sort_rule_id = $defaultBookSortSetting;
-                $book->save();
             }
 
+            $book->save();
+
             return $book;
         }))->run();
     }
@@ -52,28 +51,29 @@ class BookRepo
      */
     public function update(Book $book, array $input): Book
     {
-        $this->baseRepo->update($book, $input);
+        $book = $this->baseRepo->update($book, $input);
 
         if (array_key_exists('default_template_id', $input)) {
-            $this->baseRepo->updateDefaultTemplate($book, intval($input['default_template_id']));
+            $book->defaultTemplate()->setFromId(intval($input['default_template_id']));
         }
 
         if (array_key_exists('image', $input)) {
             $this->baseRepo->updateCoverImage($book, $input['image'], $input['image'] === null);
         }
 
+        $book->save();
         Activity::add(ActivityType::BOOK_UPDATE, $book);
 
         return $book;
     }
 
     /**
-     * Update the given book's cover image, or clear it.
+     * Update the given book's cover image or clear it.
      *
      * @throws ImageUploadException
      * @throws Exception
      */
-    public function updateCoverImage(Book $book, ?UploadedFile $coverImage, bool $removeImage = false)
+    public function updateCoverImage(Book $book, ?UploadedFile $coverImage, bool $removeImage = false): void
     {
         $this->baseRepo->updateCoverImage($book, $coverImage, $removeImage);
     }
@@ -83,7 +83,7 @@ class BookRepo
      *
      * @throws Exception
      */
-    public function destroy(Book $book)
+    public function destroy(Book $book): void
     {
         $this->trashCan->softDestroyBook($book);
         Activity::add(ActivityType::BOOK_DELETE, $book);

app/Entities/Repos/BookshelfRepo.php

@@ -25,8 +25,7 @@ class BookshelfRepo
     public function create(array $input, array $bookIds): Bookshelf
     {
         return (new DatabaseTransaction(function () use ($input, $bookIds) {
-            $shelf = new Bookshelf();
-            $this->baseRepo->create($shelf, $input);
+            $shelf = $this->baseRepo->create(new Bookshelf(), $input);
             $this->baseRepo->updateCoverImage($shelf, $input['image'] ?? null);
             $this->updateBooks($shelf, $bookIds);
             Activity::add(ActivityType::BOOKSHELF_CREATE, $shelf);
@@ -39,7 +38,7 @@ class BookshelfRepo
      */
     public function update(Bookshelf $shelf, array $input, ?array $bookIds): Bookshelf
     {
-        $this->baseRepo->update($shelf, $input);
+        $shelf = $this->baseRepo->update($shelf, $input);
 
         if (!is_null($bookIds)) {
             $this->updateBooks($shelf, $bookIds);
@@ -96,7 +95,7 @@ class BookshelfRepo
      *
      * @throws Exception
      */
-    public function destroy(Bookshelf $shelf)
+    public function destroy(Bookshelf $shelf): void
     {
         $this->trashCan->softDestroyShelf($shelf);
         Activity::add(ActivityType::BOOKSHELF_DELETE, $shelf);

app/Entities/Repos/ChapterRepo.php

@@ -7,6 +7,7 @@ use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Chapter;
 use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Entities\Tools\BookContents;
+use BookStack\Entities\Tools\ParentChanger;
 use BookStack\Entities\Tools\TrashCan;
 use BookStack\Exceptions\MoveOperationException;
 use BookStack\Exceptions\PermissionsException;
@@ -21,6 +22,7 @@ class ChapterRepo
         protected BaseRepo $baseRepo,
         protected EntityQueries $entityQueries,
         protected TrashCan $trashCan,
+        protected ParentChanger $parentChanger,
     ) {
     }
 
@@ -33,8 +35,11 @@ class ChapterRepo
             $chapter = new Chapter();
             $chapter->book_id = $parentBook->id;
             $chapter->priority = (new BookContents($parentBook))->getLastPriority() + 1;
-            $this->baseRepo->create($chapter, $input);
-            $this->baseRepo->updateDefaultTemplate($chapter, intval($input['default_template_id'] ?? null));
+
+            $chapter = $this->baseRepo->create($chapter, $input);
+            $chapter->defaultTemplate()->setFromId(intval($input['default_template_id'] ?? null));
+
+            $chapter->save();
             Activity::add(ActivityType::CHAPTER_CREATE, $chapter);
 
             $this->baseRepo->sortParent($chapter);
@@ -48,12 +53,13 @@ class ChapterRepo
      */
     public function update(Chapter $chapter, array $input): Chapter
     {
-        $this->baseRepo->update($chapter, $input);
+        $chapter = $this->baseRepo->update($chapter, $input);
 
         if (array_key_exists('default_template_id', $input)) {
-            $this->baseRepo->updateDefaultTemplate($chapter, intval($input['default_template_id']));
+            $chapter->defaultTemplate()->setFromId(intval($input['default_template_id']));
         }
 
+        $chapter->save();
         Activity::add(ActivityType::CHAPTER_UPDATE, $chapter);
 
         $this->baseRepo->sortParent($chapter);
@@ -66,7 +72,7 @@ class ChapterRepo
      *
      * @throws Exception
      */
-    public function destroy(Chapter $chapter)
+    public function destroy(Chapter $chapter): void
     {
         $this->trashCan->softDestroyChapter($chapter);
         Activity::add(ActivityType::CHAPTER_DELETE, $chapter);
@@ -93,7 +99,7 @@ class ChapterRepo
         }
 
         return (new DatabaseTransaction(function () use ($chapter, $parent) {
-            $chapter->changeBook($parent->id);
+            $this->parentChanger->changeBook($chapter, $parent->id);
             $chapter->rebuildPermissions();
             Activity::add(ActivityType::CHAPTER_MOVE, $chapter);
 

app/Entities/Repos/DeletionRepo.php

@@ -9,11 +9,9 @@ use BookStack\Facades\Activity;
 
 class DeletionRepo
 {
-    private TrashCan $trashCan;
-
-    public function __construct(TrashCan $trashCan)
-    {
-        $this->trashCan = $trashCan;
+    public function __construct(
+        protected TrashCan $trashCan
+    ) {
     }
 
     public function restore(int $id): int

app/Entities/Repos/PageRepo.php

@@ -12,6 +12,7 @@ use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Entities\Tools\BookContents;
 use BookStack\Entities\Tools\PageContent;
 use BookStack\Entities\Tools\PageEditorType;
+use BookStack\Entities\Tools\ParentChanger;
 use BookStack\Entities\Tools\TrashCan;
 use BookStack\Exceptions\MoveOperationException;
 use BookStack\Exceptions\PermissionsException;
@@ -31,13 +32,14 @@ class PageRepo
         protected ReferenceStore $referenceStore,
         protected ReferenceUpdater $referenceUpdater,
         protected TrashCan $trashCan,
+        protected ParentChanger $parentChanger,
     ) {
     }
 
     /**
      * Get a new draft page belonging to the given parent entity.
      */
-    public function getNewDraftPage(Entity $parent)
+    public function getNewDraftPage(Entity $parent): Page
     {
         $page = (new Page())->forceFill([
             'name'       => trans('entities.pages_initial_name'),
@@ -46,6 +48,9 @@ class PageRepo
             'updated_by' => user()->id,
             'draft'      => true,
             'editor'     => PageEditorType::getSystemDefault()->value,
+            'html'       => '',
+            'markdown'   => '',
+            'text'       => '',
         ]);
 
         if ($parent instanceof Chapter) {
@@ -55,17 +60,18 @@ class PageRepo
             $page->book_id = $parent->id;
         }
 
-        $defaultTemplate = $page->chapter->defaultTemplate ?? $page->book->defaultTemplate;
-        if ($defaultTemplate && userCan(Permission::PageView, $defaultTemplate)) {
+        $defaultTemplate = $page->chapter?->defaultTemplate()->get() ?? $page->book?->defaultTemplate()->get();
+        if ($defaultTemplate) {
             $page->forceFill([
                 'html'  => $defaultTemplate->html,
                 'markdown' => $defaultTemplate->markdown,
             ]);
+            $page->text = (new PageContent($page))->toPlainText();
         }
 
         (new DatabaseTransaction(function () use ($page) {
             $page->save();
-            $page->refresh()->rebuildPermissions();
+            $page->rebuildPermissions();
         }))->run();
 
         return $page;
@@ -81,7 +87,8 @@ class PageRepo
             $draft->revision_count = 1;
             $draft->priority = $this->getNewPriority($draft);
             $this->updateTemplateStatusAndContentFromInput($draft, $input);
-            $this->baseRepo->update($draft, $input);
+
+            $draft = $this->baseRepo->update($draft, $input);
             $draft->rebuildPermissions();
 
             $summary = trim($input['summary'] ?? '') ?: trans('entities.pages_initial_revision');
@@ -112,12 +119,12 @@ class PageRepo
     public function update(Page $page, array $input): Page
     {
         // Hold the old details to compare later
-        $oldHtml = $page->html;
         $oldName = $page->name;
+        $oldHtml = $page->html;
         $oldMarkdown = $page->markdown;
 
         $this->updateTemplateStatusAndContentFromInput($page, $input);
-        $this->baseRepo->update($page, $input);
+        $page = $this->baseRepo->update($page, $input);
 
         // Update with new details
         $page->revision_count++;
@@ -176,12 +183,12 @@ class PageRepo
     /**
      * Save a page update draft.
      */
-    public function updatePageDraft(Page $page, array $input)
+    public function updatePageDraft(Page $page, array $input): Page|PageRevision
     {
-        // If the page itself is a draft simply update that
+        // If the page itself is a draft, simply update that
         if ($page->draft) {
             $this->updateTemplateStatusAndContentFromInput($page, $input);
-            $page->fill($input);
+            $page->forceFill(array_intersect_key($input, array_flip(['name'])))->save();
             $page->save();
 
             return $page;
@@ -209,7 +216,7 @@ class PageRepo
      *
      * @throws Exception
      */
-    public function destroy(Page $page)
+    public function destroy(Page $page): void
     {
         $this->trashCan->softDestroyPage($page);
         Activity::add(ActivityType::PAGE_DELETE, $page);
@@ -237,7 +244,7 @@ class PageRepo
         }
 
         $page->updated_by = user()->id;
-        $page->refreshSlug();
+        $this->baseRepo->refreshSlug($page);
         $page->save();
         $page->indexForSearch();
         $this->referenceStore->updateForEntity($page);
@@ -279,7 +286,7 @@ class PageRepo
         return (new DatabaseTransaction(function () use ($page, $parent) {
             $page->chapter_id = ($parent instanceof Chapter) ? $parent->id : null;
             $newBookId = ($parent instanceof Chapter) ? $parent->book->id : $parent->id;
-            $page->changeBook($newBookId);
+            $this->parentChanger->changeBook($page, $newBookId);
             $page->rebuildPermissions();
 
             Activity::add(ActivityType::PAGE_MOVE, $page);

app/Entities/Repos/RevisionRepo.php

@@ -23,7 +23,7 @@ class RevisionRepo
 
     /**
      * Get a user update_draft page revision to update for the given page.
-     * Checks for an existing revisions before providing a fresh one.
+     * Checks for an existing revision before providing a fresh one.
      */
     public function getNewDraftForCurrentUser(Page $page): PageRevision
     {
@@ -72,7 +72,7 @@ class RevisionRepo
     /**
      * Delete old revisions, for the given page, from the system.
      */
-    protected function deleteOldRevisions(Page $page)
+    protected function deleteOldRevisions(Page $page): void
     {
         $revisionLimit = config('app.revision_limit');
         if ($revisionLimit === false) {

app/Entities/Tools/BookContents.php

@@ -3,13 +3,10 @@
 namespace BookStack\Entities\Tools;
 
 use BookStack\Entities\Models\Book;
-use BookStack\Entities\Models\BookChild;
 use BookStack\Entities\Models\Chapter;
 use BookStack\Entities\Models\Entity;
 use BookStack\Entities\Models\Page;
 use BookStack\Entities\Queries\EntityQueries;
-use BookStack\Sorting\BookSortMap;
-use BookStack\Sorting\BookSortMapItem;
 use Illuminate\Support\Collection;
 
 class BookContents
@@ -29,7 +26,7 @@ class BookContents
     {
         $maxPage = $this->book->pages()
             ->where('draft', '=', false)
-            ->where('chapter_id', '=', 0)
+            ->whereDoesntHave('chapter')
             ->max('priority');
 
         $maxChapter = $this->book->chapters()
@@ -80,11 +77,11 @@ class BookContents
     protected function bookChildSortFunc(): callable
     {
         return function (Entity $entity) {
-            if (isset($entity['draft']) && $entity['draft']) {
+            if ($entity->getAttribute('draft') ?? false) {
                 return -100;
             }
 
-            return $entity['priority'] ?? 0;
+            return $entity->getAttribute('priority') ?? 0;
         };
     }
 

app/Entities/Tools/Cloner.php

@@ -6,37 +6,54 @@ use BookStack\Activity\Models\Tag;
 use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Bookshelf;
 use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\HasCoverInterface;
 use BookStack\Entities\Models\Entity;
-use BookStack\Entities\Models\CoverImageInterface;
 use BookStack\Entities\Models\Page;
 use BookStack\Entities\Repos\BookRepo;
 use BookStack\Entities\Repos\ChapterRepo;
 use BookStack\Entities\Repos\PageRepo;
 use BookStack\Permissions\Permission;
+use BookStack\References\ReferenceChangeContext;
+use BookStack\References\ReferenceUpdater;
 use BookStack\Uploads\Image;
 use BookStack\Uploads\ImageService;
 use Illuminate\Http\UploadedFile;
 
 class Cloner
 {
+    protected ReferenceChangeContext $referenceChangeContext;
+
     public function __construct(
         protected PageRepo $pageRepo,
         protected ChapterRepo $chapterRepo,
         protected BookRepo $bookRepo,
         protected ImageService $imageService,
+        protected ReferenceUpdater $referenceUpdater,
     ) {
+        $this->referenceChangeContext = new ReferenceChangeContext();
     }
 
     /**
      * Clone the given page into the given parent using the provided name.
      */
     public function clonePage(Page $original, Entity $parent, string $newName): Page
+    {
+        $context = $this->newReferenceChangeContext();
+        $page = $this->createPageClone($original, $parent, $newName);
+        $this->referenceUpdater->changeReferencesUsingContext($context);
+        return $page;
+    }
+
+    protected function createPageClone(Page $original, Entity $parent, string $newName): Page
     {
         $copyPage = $this->pageRepo->getNewDraftPage($parent);
         $pageData = $this->entityToInputData($original);
         $pageData['name'] = $newName;
 
-        return $this->pageRepo->publishDraft($copyPage, $pageData);
+        $newPage = $this->pageRepo->publishDraft($copyPage, $pageData);
+        $this->referenceChangeContext->add($original, $newPage);
+
+        return $newPage;
     }
 
     /**
@@ -44,6 +61,14 @@ class Cloner
      * Clones all child pages.
      */
     public function cloneChapter(Chapter $original, Book $parent, string $newName): Chapter
+    {
+        $context = $this->newReferenceChangeContext();
+        $chapter = $this->createChapterClone($original, $parent, $newName);
+        $this->referenceUpdater->changeReferencesUsingContext($context);
+        return $chapter;
+    }
+
+    protected function createChapterClone(Chapter $original, Book $parent, string $newName): Chapter
     {
         $chapterDetails = $this->entityToInputData($original);
         $chapterDetails['name'] = $newName;
@@ -53,10 +78,12 @@ class Cloner
         if (userCan(Permission::PageCreate, $copyChapter)) {
             /** @var Page $page */
             foreach ($original->getVisiblePages() as $page) {
-                $this->clonePage($page, $copyChapter, $page->name);
+                $this->createPageClone($page, $copyChapter, $page->name);
             }
         }
 
+        $this->referenceChangeContext->add($original, $copyChapter);
+
         return $copyChapter;
     }
 
@@ -65,6 +92,14 @@ class Cloner
      * Clones all child chapters and pages.
      */
     public function cloneBook(Book $original, string $newName): Book
+    {
+        $context = $this->newReferenceChangeContext();
+        $book = $this->createBookClone($original, $newName);
+        $this->referenceUpdater->changeReferencesUsingContext($context);
+        return $book;
+    }
+
+    protected function createBookClone(Book $original, string $newName): Book
     {
         $bookDetails = $this->entityToInputData($original);
         $bookDetails['name'] = $newName;
@@ -76,11 +111,11 @@ class Cloner
         $directChildren = $original->getDirectVisibleChildren();
         foreach ($directChildren as $child) {
             if ($child instanceof Chapter && userCan(Permission::ChapterCreate, $copyBook)) {
-                $this->cloneChapter($child, $copyBook, $child->name);
+                $this->createChapterClone($child, $copyBook, $child->name);
             }
 
             if ($child instanceof Page && !$child->draft && userCan(Permission::PageCreate, $copyBook)) {
-                $this->clonePage($child, $copyBook, $child->name);
+                $this->createPageClone($child, $copyBook, $child->name);
             }
         }
 
@@ -92,6 +127,8 @@ class Cloner
             }
         }
 
+        $this->referenceChangeContext->add($original, $copyBook);
+
         return $copyBook;
     }
 
@@ -106,8 +143,8 @@ class Cloner
         $inputData['tags'] = $this->entityTagsToInputArray($entity);
 
         // Add a cover to the data if existing on the original entity
-        if ($entity instanceof CoverImageInterface) {
-            $cover = $entity->cover()->first();
+        if ($entity instanceof HasCoverInterface) {
+            $cover = $entity->coverInfo()->getImage();
             if ($cover) {
                 $inputData['image'] = $this->imageToUploadedFile($cover);
             }
@@ -155,4 +192,10 @@ class Cloner
 
         return $tags;
     }
+
+    protected function newReferenceChangeContext(): ReferenceChangeContext
+    {
+        $this->referenceChangeContext = new ReferenceChangeContext();
+        return $this->referenceChangeContext;
+    }
 }

app/Entities/Tools/EntityCover.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\Book;
+use BookStack\Entities\Models\Bookshelf;
+use BookStack\Uploads\Image;
+use Exception;
+use Illuminate\Database\Eloquent\Builder;
+
+class EntityCover
+{
+    public function __construct(
+        protected Book|Bookshelf $entity,
+    ) {
+    }
+
+    protected function imageQuery(): Builder
+    {
+        return Image::query()->where('id', '=', $this->entity->image_id);
+    }
+
+    /**
+     * Check if a cover image exists for this entity.
+     */
+    public function exists(): bool
+    {
+        return $this->entity->image_id !== null && $this->imageQuery()->exists();
+    }
+
+    /**
+     * Get the assigned cover image model.
+     */
+    public function getImage(): Image|null
+    {
+        if ($this->entity->image_id === null) {
+            return null;
+        }
+
+        $cover = $this->imageQuery()->first();
+        if ($cover instanceof Image) {
+            return $cover;
+        }
+
+        return null;
+    }
+
+    /**
+     * Returns a cover image URL, or the given default if none assigned/existing.
+     */
+    public function getUrl(int $width = 440, int $height = 250, string|null $default = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=='): string|null
+    {
+        if (!$this->entity->image_id) {
+            return $default;
+        }
+
+        try {
+            return $this->getImage()?->getThumb($width, $height, false) ?? $default;
+        } catch (Exception $err) {
+            return $default;
+        }
+    }
+
+    /**
+     * Set the image to use as the cover for this entity.
+     */
+    public function setImage(Image|null $image): void
+    {
+        if ($image === null) {
+            $this->entity->image_id = null;
+        } else {
+            $this->entity->image_id = $image->id;
+        }
+    }
+}

app/Entities/Tools/EntityDefaultTemplate.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\Book;
+use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\Page;
+use BookStack\Entities\Queries\PageQueries;
+
+class EntityDefaultTemplate
+{
+    public function __construct(
+        protected Book|Chapter $entity,
+    ) {
+    }
+
+    /**
+     * Set the default template ID for this entity.
+     */
+    public function setFromId(int $templateId): void
+    {
+        $changing = $templateId !== intval($this->entity->default_template_id);
+        if (!$changing) {
+            return;
+        }
+
+        if ($templateId === 0) {
+            $this->entity->default_template_id = null;
+            return;
+        }
+
+        $pageQueries = app()->make(PageQueries::class);
+        $templateExists = $pageQueries->visibleTemplates()
+            ->where('id', '=', $templateId)
+            ->exists();
+
+        $this->entity->default_template_id = $templateExists ? $templateId : null;
+    }
+
+    /**
+     * Get the default template for this entity (if visible).
+     */
+    public function get(): Page|null
+    {
+        if (!$this->entity->default_template_id) {
+            return null;
+        }
+
+        $pageQueries = app()->make(PageQueries::class);
+        $page = $pageQueries->visibleTemplates(true)
+            ->where('id', '=', $this->entity->default_template_id)
+            ->first();
+
+        if ($page instanceof Page) {
+            return $page;
+        }
+
+        return null;
+    }
+}

app/Entities/Tools/EntityHtmlDescription.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\Book;
+use BookStack\Entities\Models\Bookshelf;
+use BookStack\Entities\Models\Chapter;
+use BookStack\Util\HtmlContentFilter;
+
+class EntityHtmlDescription
+{
+    protected string $html = '';
+    protected string $plain = '';
+
+    public function __construct(
+        protected Book|Chapter|Bookshelf $entity,
+    ) {
+        $this->html = $this->entity->description_html ?? '';
+        $this->plain = $this->entity->description ?? '';
+    }
+
+    /**
+     * Update the description from HTML code.
+     * Optionally takes plaintext to use for the model also.
+     */
+    public function set(string $html, string|null $plaintext = null): void
+    {
+        $this->html = $html;
+        $this->entity->description_html = $this->html;
+
+        if ($plaintext !== null) {
+            $this->plain = $plaintext;
+            $this->entity->description = $this->plain;
+        }
+
+        if (empty($html) && !empty($plaintext)) {
+            $this->html = $this->getHtml();
+            $this->entity->description_html = $this->html;
+        }
+    }
+
+    /**
+     * Get the description as HTML.
+     * Optionally returns the raw HTML if requested.
+     */
+    public function getHtml(bool $raw = false): string
+    {
+        $html = $this->html ?: '<p>' . nl2br(e($this->plain)) . '</p>';
+        if ($raw) {
+            return $html;
+        }
+
+        return HtmlContentFilter::removeScriptsFromHtmlString($html);
+    }
+
+    public function getPlain(): string
+    {
+        return $this->plain;
+    }
+}

app/Entities/Tools/EntityHydrator.php

@@ -0,0 +1,140 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Activity\Models\Tag;
+use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\EntityTable;
+use BookStack\Entities\Models\Page;
+use BookStack\Entities\Queries\EntityQueries;
+use Illuminate\Database\Eloquent\Collection;
+
+class EntityHydrator
+{
+    public function __construct(
+        protected EntityQueries $entityQueries,
+    ) {
+    }
+
+    /**
+     * Hydrate the entities of this hydrator to return a list of entities represented
+     * in their original intended models.
+     * @param EntityTable[] $entities
+     * @return Entity[]
+     */
+    public function hydrate(array $entities, bool $loadTags = false, bool $loadParents = false): array
+    {
+        $hydrated = [];
+
+        foreach ($entities as $entity) {
+            $data = $entity->getRawOriginal();
+            $instance = Entity::instanceFromType($entity->type);
+
+            if ($instance instanceof Page) {
+                $data['text'] = $data['description'];
+                unset($data['description']);
+            }
+
+            $instance = $instance->setRawAttributes($data, true);
+            $hydrated[] = $instance;
+        }
+
+        if ($loadTags) {
+            $this->loadTagsIntoModels($hydrated);
+        }
+
+        if ($loadParents) {
+            $this->loadParentsIntoModels($hydrated);
+        }
+
+        return $hydrated;
+    }
+
+    /**
+     * @param Entity[] $entities
+     */
+    protected function loadTagsIntoModels(array $entities): void
+    {
+        $idsByType = [];
+        $entityMap = [];
+        foreach ($entities as $entity) {
+            if (!isset($idsByType[$entity->type])) {
+                $idsByType[$entity->type] = [];
+            }
+            $idsByType[$entity->type][] = $entity->id;
+            $entityMap[$entity->type . ':' . $entity->id] = $entity;
+        }
+
+        $query = Tag::query();
+        foreach ($idsByType as $type => $ids) {
+            $query->orWhere(function ($query) use ($type, $ids) {
+                $query->where('entity_type', '=', $type)
+                    ->whereIn('entity_id', $ids);
+            });
+        }
+
+        $tags = empty($idsByType) ? [] : $query->get()->all();
+        $tagMap = [];
+        foreach ($tags as $tag) {
+            $key = $tag->entity_type . ':' . $tag->entity_id;
+            if (!isset($tagMap[$key])) {
+                $tagMap[$key] = [];
+            }
+            $tagMap[$key][] = $tag;
+        }
+
+        foreach ($entityMap as $key => $entity) {
+            $entityTags = new Collection($tagMap[$key] ?? []);
+            $entity->setRelation('tags', $entityTags);
+        }
+    }
+
+    /**
+     * @param Entity[] $entities
+     */
+    protected function loadParentsIntoModels(array $entities): void
+    {
+        $parentsByType = ['book' => [], 'chapter' => []];
+
+        foreach ($entities as $entity) {
+            if ($entity->getAttribute('book_id') !== null) {
+                $parentsByType['book'][] = $entity->getAttribute('book_id');
+            }
+            if ($entity->getAttribute('chapter_id') !== null) {
+                $parentsByType['chapter'][] = $entity->getAttribute('chapter_id');
+            }
+        }
+
+        $parentQuery = $this->entityQueries->visibleForList();
+        $filtered = count($parentsByType['book']) > 0 || count($parentsByType['chapter']) > 0;
+        $parentQuery = $parentQuery->where(function ($query) use ($parentsByType) {
+            foreach ($parentsByType as $type => $ids) {
+                if (count($ids) > 0) {
+                    $query = $query->orWhere(function ($query) use ($type, $ids) {
+                        $query->where('type', '=', $type)
+                            ->whereIn('id', $ids);
+                    });
+                }
+            }
+        });
+
+        $parentModels = $filtered ? $parentQuery->get()->all() : [];
+        $parents = $this->hydrate($parentModels);
+        $parentMap = [];
+        foreach ($parents as $parent) {
+            $parentMap[$parent->type . ':' . $parent->id] = $parent;
+        }
+
+        foreach ($entities as $entity) {
+            if ($entity instanceof Page || $entity instanceof Chapter) {
+                $key = 'book:' . $entity->getRawAttribute('book_id');
+                $entity->setRelation('book', $parentMap[$key] ?? null);
+            }
+            if ($entity instanceof Page) {
+                $key = 'chapter:' . $entity->getRawAttribute('chapter_id');
+                $entity->setRelation('chapter', $parentMap[$key] ?? null);
+            }
+        }
+    }
+}

app/Entities/Tools/HierarchyTransformer.php

@@ -17,7 +17,8 @@ class HierarchyTransformer
         protected BookRepo $bookRepo,
         protected BookshelfRepo $shelfRepo,
         protected Cloner $cloner,
-        protected TrashCan $trashCan
+        protected TrashCan $trashCan,
+        protected ParentChanger $parentChanger,
     ) {
     }
 
@@ -34,7 +35,8 @@ class HierarchyTransformer
         /** @var Page $page */
         foreach ($chapter->pages as $page) {
             $page->chapter_id = 0;
-            $page->changeBook($book->id);
+            $page->save();
+            $this->parentChanger->changeBook($page, $book->id);
         }
 
         $this->trashCan->destroyEntity($chapter);

app/Entities/Tools/MixedEntityListLoader.php

@@ -19,7 +19,7 @@ class MixedEntityListLoader
      * This will look for a model id and type via 'name_id' and 'name_type'.
      * @param Model[] $relations
      */
-    public function loadIntoRelations(array $relations, string $relationName, bool $loadParents): void
+    public function loadIntoRelations(array $relations, string $relationName, bool $loadParents, bool $withContents = false): void
     {
         $idsByType = [];
         foreach ($relations as $relation) {
@@ -33,7 +33,7 @@ class MixedEntityListLoader
             $idsByType[$type][] = $id;
         }
 
-        $modelMap = $this->idsByTypeToModelMap($idsByType, $loadParents);
+        $modelMap = $this->idsByTypeToModelMap($idsByType, $loadParents, $withContents);
 
         foreach ($relations as $relation) {
             $type = $relation->getAttribute($relationName . '_type');
@@ -49,13 +49,13 @@ class MixedEntityListLoader
      * @param array<string, int[]> $idsByType
      * @return array<string, array<int, Model>>
      */
-    protected function idsByTypeToModelMap(array $idsByType, bool $eagerLoadParents): array
+    protected function idsByTypeToModelMap(array $idsByType, bool $eagerLoadParents, bool $withContents): array
     {
         $modelMap = [];
 
         foreach ($idsByType as $type => $ids) {
-            $models = $this->queries->visibleForList($type)
-                ->whereIn('id', $ids)
+            $base = $withContents ? $this->queries->visibleForContentForType($type) : $this->queries->visibleForListForType($type);
+            $models = $base->whereIn('id', $ids)
                 ->with($eagerLoadParents ? $this->getRelationsToEagerLoad($type) : [])
                 ->get();
 

app/Entities/Tools/PageContent.php

@@ -284,7 +284,7 @@ class PageContent
     /**
      * Get a plain-text visualisation of this page.
      */
-    protected function toPlainText(): string
+    public function toPlainText(): string
     {
         $html = $this->render(true);
 

app/Entities/Tools/ParentChanger.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\BookChild;
+use BookStack\Entities\Models\Chapter;
+use BookStack\References\ReferenceUpdater;
+
+class ParentChanger
+{
+    public function __construct(
+        protected SlugGenerator $slugGenerator,
+        protected ReferenceUpdater $referenceUpdater
+    ) {
+    }
+
+    /**
+     * Change the parent book of a chapter or page.
+     */
+    public function changeBook(BookChild $child, int $newBookId): void
+    {
+        $oldUrl = $child->getUrl();
+
+        $child->book_id = $newBookId;
+        $child->unsetRelation('book');
+        $this->slugGenerator->regenerateForEntity($child);
+        $child->save();
+
+        if ($oldUrl !== $child->getUrl()) {
+            $this->referenceUpdater->updateEntityReferences($child, $oldUrl);
+        }
+
+        // Update all child pages if a chapter
+        if ($child instanceof Chapter) {
+            foreach ($child->pages()->withTrashed()->get() as $page) {
+                $this->changeBook($page, $newBookId);
+            }
+        }
+    }
+}

app/Entities/Tools/SlugGenerator.php

@@ -5,12 +5,14 @@ namespace BookStack\Entities\Tools;
 use BookStack\App\Model;
 use BookStack\App\SluggableInterface;
 use BookStack\Entities\Models\BookChild;
+use BookStack\Entities\Models\Entity;
+use BookStack\Users\Models\User;
 use Illuminate\Support\Str;
 
 class SlugGenerator
 {
     /**
-     * Generate a fresh slug for the given entity.
+     * Generate a fresh slug for the given item.
      * The slug will be generated so that it doesn't conflict within the same parent item.
      */
     public function generate(SluggableInterface&Model $model, string $slugSource): string
@@ -23,6 +25,26 @@ class SlugGenerator
         return $slug;
     }
 
+    /**
+     * Regenerate the slug for the given entity.
+     */
+    public function regenerateForEntity(Entity $entity): string
+    {
+        $entity->slug = $this->generate($entity, $entity->name);
+
+        return $entity->slug;
+    }
+
+    /**
+     * Regenerate the slug for a user.
+     */
+    public function regenerateForUser(User $user): string
+    {
+        $user->slug = $this->generate($user, $user->name);
+
+        return $user->slug;
+    }
+
     /**
      * Format a name as a URL slug.
      */

app/Entities/Tools/SlugHistory.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace BookStack\Entities\Tools;
+
+use BookStack\Entities\Models\Book;
+use BookStack\Entities\Models\BookChild;
+use BookStack\Entities\Models\Entity;
+use BookStack\Entities\Models\EntityTable;
+use BookStack\Entities\Models\SlugHistory as SlugHistoryModel;
+use BookStack\Permissions\PermissionApplicator;
+use Illuminate\Support\Facades\DB;
+
+class SlugHistory
+{
+    public function __construct(
+        protected PermissionApplicator $permissions,
+    ) {
+    }
+
+    /**
+     * Record the current slugs for the given entity.
+     */
+    public function recordForEntity(Entity $entity): void
+    {
+        if (!$entity->id || !$entity->slug) {
+            return;
+        }
+
+        $parentSlug = null;
+        if ($entity instanceof BookChild) {
+            $parentSlug = $entity->book()->first()?->slug;
+        }
+
+        $latest = $this->getLatestEntryForEntity($entity);
+        if ($latest && $latest->slug === $entity->slug && $latest->parent_slug === $parentSlug) {
+            return;
+        }
+
+        $info = [
+            'sluggable_type' => $entity->getMorphClass(),
+            'sluggable_id'   => $entity->id,
+            'slug'           => $entity->slug,
+            'parent_slug'    => $parentSlug,
+        ];
+
+        $entry = new SlugHistoryModel();
+        $entry->forceFill($info);
+        $entry->save();
+
+        if ($entity instanceof Book) {
+            $this->recordForBookChildren($entity);
+        }
+    }
+
+    protected function recordForBookChildren(Book $book): void
+    {
+        $query = EntityTable::query()
+            ->select(['type', 'id', 'slug', DB::raw("'{$book->slug}' as parent_slug"), DB::raw('now() as created_at'), DB::raw('now() as updated_at')])
+            ->where('book_id', '=', $book->id)
+            ->whereNotNull('book_id');
+
+        SlugHistoryModel::query()->insertUsing(
+            ['sluggable_type', 'sluggable_id', 'slug', 'parent_slug', 'created_at', 'updated_at'],
+            $query
+        );
+    }
+
+    /**
+     * Find the latest visible entry for an entity which uses the given slug(s) in the history.
+     */
+    public function lookupEntityIdUsingSlugs(string $type, string $slug, string $parentSlug = ''): ?int
+    {
+        $query = SlugHistoryModel::query()
+            ->where('sluggable_type', '=', $type)
+            ->where('slug', '=', $slug);
+
+        if ($parentSlug) {
+            $query->where('parent_slug', '=', $parentSlug);
+        }
+
+        $query = $this->permissions->restrictEntityRelationQuery($query, 'slug_history', 'sluggable_id', 'sluggable_type');
+
+        /** @var SlugHistoryModel|null $result */
+        $result = $query->orderBy('created_at', 'desc')->first();
+
+        return $result?->sluggable_id;
+    }
+
+    protected function getLatestEntryForEntity(Entity $entity): SlugHistoryModel|null
+    {
+        return SlugHistoryModel::query()
+            ->where('sluggable_type', '=', $entity->getMorphClass())
+            ->where('sluggable_id', '=', $entity->id)
+            ->orderBy('created_at', 'desc')
+            ->first();
+    }
+}

app/Entities/Tools/TrashCan.php

@@ -6,14 +6,16 @@ use BookStack\Entities\EntityProvider;
 use BookStack\Entities\Models\Book;
 use BookStack\Entities\Models\Bookshelf;
 use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\EntityContainerData;
+use BookStack\Entities\Models\HasCoverInterface;
 use BookStack\Entities\Models\Deletion;
 use BookStack\Entities\Models\Entity;
-use BookStack\Entities\Models\CoverImageInterface;
 use BookStack\Entities\Models\Page;
 use BookStack\Entities\Queries\EntityQueries;
 use BookStack\Exceptions\NotifyException;
 use BookStack\Facades\Activity;
 use BookStack\Uploads\AttachmentService;
+use BookStack\Uploads\Image;
 use BookStack\Uploads\ImageService;
 use BookStack\Util\DatabaseTransaction;
 use Exception;
@@ -140,6 +142,7 @@ class TrashCan
     protected function destroyShelf(Bookshelf $shelf): int
     {
         $this->destroyCommonRelations($shelf);
+        $shelf->books()->detach();
         $shelf->forceDelete();
 
         return 1;
@@ -167,6 +170,7 @@ class TrashCan
         }
 
         $this->destroyCommonRelations($book);
+        $book->shelves()->detach();
         $book->forceDelete();
 
         return $count + 1;
@@ -209,15 +213,16 @@ class TrashCan
             $attachmentService->deleteFile($attachment);
         }
 
-        // Remove book template usages
-        $this->queries->books->start()
+        // Remove use as a template
+        EntityContainerData::query()
             ->where('default_template_id', '=', $page->id)
             ->update(['default_template_id' => null]);
 
-        // Remove chapter template usages
-        $this->queries->chapters->start()
-            ->where('default_template_id', '=', $page->id)
-            ->update(['default_template_id' => null]);
+        // Nullify uploaded image relations
+        Image::query()
+            ->whereIn('type', ['gallery', 'drawio'])
+            ->where('uploaded_to', '=', $page->id)
+            ->update(['uploaded_to' => null]);
 
         $page->forceDelete();
 
@@ -268,8 +273,8 @@ class TrashCan
         // exists in the event it has already been destroyed during this request.
         $entity = $deletion->deletable()->first();
         $count = 0;
-        if ($entity) {
-            $count = $this->destroyEntity($deletion->deletable);
+        if ($entity instanceof Entity) {
+            $count = $this->destroyEntity($entity);
         }
         $deletion->delete();
 
@@ -383,7 +388,7 @@ class TrashCan
     /**
      * Update entity relations to remove or update outstanding connections.
      */
-    protected function destroyCommonRelations(Entity $entity)
+    protected function destroyCommonRelations(Entity $entity): void
     {
         Activity::removeEntity($entity);
         $entity->views()->delete();
@@ -397,10 +402,13 @@ class TrashCan
         $entity->watches()->delete();
         $entity->referencesTo()->delete();
         $entity->referencesFrom()->delete();
+        $entity->slugHistory()->delete();
 
-        if ($entity instanceof CoverImageInterface && $entity->cover()->exists()) {
+        if ($entity instanceof HasCoverInterface && $entity->coverInfo()->exists()) {
             $imageService = app()->make(ImageService::class);
-            $imageService->destroy($entity->cover()->first());
+            $imageService->destroy($entity->coverInfo()->getImage());
         }
+
+        $entity->relatedData()->delete();
     }
 }

app/Exports/ExportFormatter.php

@@ -284,7 +284,7 @@ class ExportFormatter
     public function bookToPlainText(Book $book): string
     {
         $bookTree = (new BookContents($book))->getTree(false, true);
-        $text = $book->name . "\n" . $book->description;
+        $text = $book->name . "\n" . $book->descriptionInfo()->getPlain();
         $text = rtrim($text) . "\n\n";
 
         $parts = [];
@@ -318,7 +318,7 @@ class ExportFormatter
     {
         $text = '# ' . $chapter->name . "\n\n";
 
-        $description = (new HtmlToMarkdown($chapter->descriptionHtml()))->convert();
+        $description = (new HtmlToMarkdown($chapter->descriptionInfo()->getHtml()))->convert();
         if ($description) {
             $text .= $description . "\n\n";
         }
@@ -338,7 +338,7 @@ class ExportFormatter
         $bookTree = (new BookContents($book))->getTree(false, true);
         $text = '# ' . $book->name . "\n\n";
 
-        $description = (new HtmlToMarkdown($book->descriptionHtml()))->convert();
+        $description = (new HtmlToMarkdown($book->descriptionInfo()->getHtml()))->convert();
         if ($description) {
             $text .= $description . "\n\n";
         }

app/Exports/ZipExports/Models/ZipExportBook.php

@@ -55,10 +55,10 @@ final class ZipExportBook extends ZipExportModel
         $instance = new self();
         $instance->id = $model->id;
         $instance->name = $model->name;
-        $instance->description_html = $model->descriptionHtml();
+        $instance->description_html = $model->descriptionInfo()->getHtml();
 
-        if ($model->cover) {
-            $instance->cover = $files->referenceForImage($model->cover);
+        if ($model->coverInfo()->exists()) {
+            $instance->cover = $files->referenceForImage($model->coverInfo()->getImage());
         }
 
         $instance->tags = ZipExportTag::fromModelArray($model->tags()->get()->all());

app/Exports/ZipExports/Models/ZipExportChapter.php

@@ -40,7 +40,7 @@ final class ZipExportChapter extends ZipExportModel
         $instance = new self();
         $instance->id = $model->id;
         $instance->name = $model->name;
-        $instance->description_html = $model->descriptionHtml();
+        $instance->description_html = $model->descriptionInfo()->getHtml();
         $instance->priority = $model->priority;
         $instance->tags = ZipExportTag::fromModelArray($model->tags()->get()->all());
 

app/Exports/ZipExports/ZipExportReader.php

@@ -58,6 +58,16 @@ class ZipExportReader
     {
         $this->open();
 
+        $info = $this->zip->statName('data.json');
+        if ($info === false) {
+            throw new ZipExportException(trans('errors.import_zip_cant_decode_data'));
+        }
+
+        $maxSize = max(intval(config()->get('app.upload_limit')), 1) * 1000000;
+        if ($info['size'] > $maxSize) {
+            throw new ZipExportException(trans('errors.import_zip_data_too_large'));
+        }
+
         // Validate json data exists, including metadata
         $jsonData = $this->zip->getFromName('data.json') ?: '';
         $importData = json_decode($jsonData, true);
@@ -73,6 +83,17 @@ class ZipExportReader
         return $this->zip->statName("files/{$fileName}") !== false;
     }
 
+    public function fileWithinSizeLimit(string $fileName): bool
+    {
+        $fileInfo = $this->zip->statName("files/{$fileName}");
+        if ($fileInfo === false) {
+            return false;
+        }
+
+        $maxSize = max(intval(config()->get('app.upload_limit')), 1) * 1000000;
+        return $fileInfo['size'] <= $maxSize;
+    }
+
     /**
      * @return false|resource
      */

app/Exports/ZipExports/ZipExportReferences.php

@@ -15,6 +15,7 @@ use BookStack\Exports\ZipExports\Models\ZipExportPage;
 use BookStack\Permissions\Permission;
 use BookStack\Uploads\Attachment;
 use BookStack\Uploads\Image;
+use BookStack\Uploads\ImageService;
 
 class ZipExportReferences
 {
@@ -33,6 +34,7 @@ class ZipExportReferences
 
     public function __construct(
         protected ZipReferenceParser $parser,
+        protected ImageService $imageService,
     ) {
     }
 
@@ -133,10 +135,17 @@ class ZipExportReferences
                 return "[[bsexport:image:{$model->id}]]";
             }
 
-            // Find and include images if in visibility
+            // Get the page which we'll reference this image upon
             $page = $model->getPage();
-            $pageExportModel = $this->pages[$page->id] ?? ($exportModel instanceof ZipExportPage ? $exportModel : null);
-            if (isset($this->images[$model->id]) || ($page && $pageExportModel && userCan(Permission::PageView, $page))) {
+            $pageExportModel = null;
+            if ($page && isset($this->pages[$page->id])) {
+                $pageExportModel = $this->pages[$page->id];
+            } elseif ($exportModel instanceof ZipExportPage) {
+                $pageExportModel = $exportModel;
+            }
+
+            // Add the image to the export if it's accessible or just return the existing reference if already added
+            if (isset($this->images[$model->id]) || ($pageExportModel && $this->imageService->imageAccessible($model))) {
                 if (!isset($this->images[$model->id])) {
                     $exportImage = ZipExportImage::fromModel($model, $files);
                     $this->images[$model->id] = $exportImage;
@@ -144,6 +153,7 @@ class ZipExportReferences
                 }
                 return "[[bsexport:image:{$model->id}]]";
             }
+
             return null;
         }
 

app/Exports/ZipExports/ZipFileReferenceRule.php

@@ -13,7 +13,6 @@ class ZipFileReferenceRule implements ValidationRule
     ) {
     }
 
-
     /**
      * @inheritDoc
      */
@@ -23,6 +22,13 @@ class ZipFileReferenceRule implements ValidationRule
             $fail('validation.zip_file')->translate();
         }
 
+        if (!$this->context->zipReader->fileWithinSizeLimit($value)) {
+            $fail('validation.zip_file_size')->translate([
+                'attribute' => $value,
+                'size' => config('app.upload_limit'),
+            ]);
+        }
+
         if (!empty($this->acceptedMimes)) {
             $fileMime = $this->context->zipReader->sniffFileMime($value);
             if (!in_array($fileMime, $this->acceptedMimes)) {

app/Exports/ZipExports/ZipImportRunner.php

@@ -135,8 +135,8 @@ class ZipImportRunner
             'tags' => $this->exportTagsToInputArray($exportBook->tags ?? []),
         ]);
 
-        if ($book->cover) {
-            $this->references->addImage($book->cover, null);
+        if ($book->coverInfo()->getImage()) {
+            $this->references->addImage($book->coverInfo()->getImage(), null);
         }
 
         $children = [
@@ -197,8 +197,8 @@ class ZipImportRunner
 
         $this->pageRepo->publishDraft($page, [
             'name' => $exportPage->name,
-            'markdown' => $exportPage->markdown,
-            'html' => $exportPage->html,
+            'markdown' => $exportPage->markdown ?? '',
+            'html' => $exportPage->html ?? '',
             'tags' => $this->exportTagsToInputArray($exportPage->tags ?? []),
         ]);
 
@@ -265,6 +265,12 @@ class ZipImportRunner
 
     protected function zipFileToUploadedFile(string $fileName, ZipExportReader $reader): UploadedFile
     {
+        if (!$reader->fileWithinSizeLimit($fileName)) {
+            throw new ZipImportException([
+                "File $fileName exceeds app upload limit."
+            ]);
+        }
+
         $tempPath = tempnam(sys_get_temp_dir(), 'bszipextract');
         $fileStream = $reader->streamFile($fileName);
         $tempStream = fopen($tempPath, 'wb');

app/Http/ApiController.php

@@ -8,6 +8,12 @@ use Illuminate\Http\JsonResponse;
 
 abstract class ApiController extends Controller
 {
+    /**
+     * The validation rules for this controller.
+     * Can alternative be defined in a rules() method is they need to be dynamic.
+     *
+     * @var array<string, array<string, string[]>>
+     */
     protected array $rules = [];
 
     /**

app/Http/Middleware/StartSessionExtended.php

@@ -14,7 +14,10 @@ use Illuminate\Session\Middleware\StartSession as Middleware;
 class StartSessionExtended extends Middleware
 {
     protected static array $pathPrefixesExcludedFromHistory = [
-        'uploads/images/'
+        'uploads/images/',
+        'dist/',
+        'manifest.json',
+        'opensearch.xml',
     ];
 
     /**