app/Entities/Tools/TrashCan.php
<?php
namespace BookStack\Entities\Tools;
use BookStack\Entities\EntityProvider;
use BookStack\Entities\Models\Book;
use BookStack\Entities\Models\Bookshelf;
use BookStack\Entities\Models\Chapter;
use BookStack\Entities\Models\Deletion;
use BookStack\Entities\Models\Entity;
use BookStack\Entities\Models\HasCoverImage;
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\ImageService;
use Exception;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Carbon;
class TrashCan
{
public function __construct(
protected EntityQueries $queries,
) {
}
/**
* Send a shelf to the recycle bin.
*
* @throws NotifyException
*/
public function softDestroyShelf(Bookshelf $shelf)
{
$this->ensureDeletable($shelf);
Deletion::createForEntity($shelf);
$shelf->delete();
}
/**
* Send a book to the recycle bin.
*
* @throws Exception
*/
public function softDestroyBook(Book $book)
{
$this->ensureDeletable($book);
Deletion::createForEntity($book);
foreach ($book->pages as $page) {
$this->softDestroyPage($page, false);
}
foreach ($book->chapters as $chapter) {
$this->softDestroyChapter($chapter, false);
}
$book->delete();
}
/**
* Send a chapter to the recycle bin.
*
* @throws Exception
*/
public function softDestroyChapter(Chapter $chapter, bool $recordDelete = true)
{
if ($recordDelete) {
$this->ensureDeletable($chapter);
Deletion::createForEntity($chapter);
}
if (count($chapter->pages) > 0) {
foreach ($chapter->pages as $page) {
$this->softDestroyPage($page, false);
}
}
$chapter->delete();
}
/**
* Send a page to the recycle bin.
*
* @throws Exception
*/
public function softDestroyPage(Page $page, bool $recordDelete = true)
{
if ($recordDelete) {
$this->ensureDeletable($page);
Deletion::createForEntity($page);
}
$page->delete();
}
/**
* Ensure the given entity is deletable.
* Is not for permissions, but logical conditions within the application.
* Will throw if not deletable.
*
* @throws NotifyException
*/
protected function ensureDeletable(Entity $entity): void
{
$customHomeId = intval(explode(':', setting('app-homepage', '0:'))[0]);
$customHomeActive = setting('app-homepage-type') === 'page';
$removeCustomHome = false;
// Check custom homepage usage for pages
if ($entity instanceof Page && $entity->id === $customHomeId) {
if ($customHomeActive) {
throw new NotifyException(trans('errors.page_custom_home_deletion'), $entity->getUrl());
}
$removeCustomHome = true;
}
// Check custom homepage usage within chapters or books
if ($entity instanceof Chapter || $entity instanceof Book) {
if ($entity->pages()->where('id', '=', $customHomeId)->exists()) {
if ($customHomeActive) {
throw new NotifyException(trans('errors.page_custom_home_deletion'), $entity->getUrl());
}
$removeCustomHome = true;
}
}
if ($removeCustomHome) {
setting()->remove('app-homepage');
}
}
/**
* Remove a bookshelf from the system.
*
* @throws Exception
*/
protected function destroyShelf(Bookshelf $shelf): int
{
$this->destroyCommonRelations($shelf);
$shelf->forceDelete();
return 1;
}
/**
* Remove a book from the system.
* Destroys any child chapters and pages.
*
* @throws Exception
*/
protected function destroyBook(Book $book): int
{
$count = 0;
$pages = $book->pages()->withTrashed()->get();
foreach ($pages as $page) {
$this->destroyPage($page);
$count++;
}
$chapters = $book->chapters()->withTrashed()->get();
foreach ($chapters as $chapter) {
$this->destroyChapter($chapter);
$count++;
}
$this->destroyCommonRelations($book);
$book->forceDelete();
return $count + 1;
}
/**
* Remove a chapter from the system.
* Destroys all pages within.
*
* @throws Exception
*/
protected function destroyChapter(Chapter $chapter): int
{
$count = 0;
$pages = $chapter->pages()->withTrashed()->get();
foreach ($pages as $page) {
$this->destroyPage($page);
$count++;
}
$this->destroyCommonRelations($chapter);
$chapter->forceDelete();
return $count + 1;
}
/**
* Remove a page from the system.
*
* @throws Exception
*/
protected function destroyPage(Page $page): int
{
$this->destroyCommonRelations($page);
$page->allRevisions()->delete();
// Delete Attached Files
$attachmentService = app()->make(AttachmentService::class);
foreach ($page->attachments as $attachment) {
$attachmentService->deleteFile($attachment);
}
// Remove book template usages
$this->queries->books->start()
->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]);
$page->forceDelete();
return 1;
}
/**
* Get the total counts of those that have been trashed
* but not yet fully deleted (In recycle bin).
*/
public function getTrashedCounts(): array
{
$counts = [];
foreach ((new EntityProvider())->all() as $key => $instance) {
/** @var Builder<Entity> $query */
$query = $instance->newQuery();
$counts[$key] = $query->onlyTrashed()->count();
}
return $counts;
}
/**
* Destroy all items that have pending deletions.
*
* @throws Exception
*/
public function empty(): int
{
$deletions = Deletion::all();
$deleteCount = 0;
foreach ($deletions as $deletion) {
$deleteCount += $this->destroyFromDeletion($deletion);
}
return $deleteCount;
}
/**
* Destroy an element from the given deletion model.
*
* @throws Exception
*/
public function destroyFromDeletion(Deletion $deletion): int
{
// We directly load the deletable element here just to ensure it still
// 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);
}
$deletion->delete();
return $count;
}
/**
* Restore the content within the given deletion.
*
* @throws Exception
*/
public function restoreFromDeletion(Deletion $deletion): int
{
$shouldRestore = true;
$restoreCount = 0;
if ($deletion->deletable instanceof Entity) {
$parent = $deletion->deletable->getParent();
if ($parent && $parent->trashed()) {
$shouldRestore = false;
}
}
if ($deletion->deletable instanceof Entity && $shouldRestore) {
$restoreCount = $this->restoreEntity($deletion->deletable);
}
$deletion->delete();
return $restoreCount;
}
/**
* Automatically clear old content from the recycle bin
* depending on the configured lifetime.
* Returns the total number of deleted elements.
*
* @throws Exception
*/
public function autoClearOld(): int
{
$lifetime = intval(config('app.recycle_bin_lifetime'));
if ($lifetime < 0) {
return 0;
}
$clearBeforeDate = Carbon::now()->addSeconds(10)->subDays($lifetime);
$deleteCount = 0;
$deletionsToRemove = Deletion::query()->where('created_at', '<', $clearBeforeDate)->get();
foreach ($deletionsToRemove as $deletion) {
$deleteCount += $this->destroyFromDeletion($deletion);
}
return $deleteCount;
}
/**
* Restore an entity so it is essentially un-deleted.
* Deletions on restored child elements will be removed during this restoration.
*/
protected function restoreEntity(Entity $entity): int
{
$count = 1;
$entity->restore();
$restoreAction = function ($entity) use (&$count) {
if ($entity->deletions_count > 0) {
$entity->deletions()->delete();
}
$entity->restore();
$count++;
};
if ($entity instanceof Chapter || $entity instanceof Book) {
$entity->pages()->withTrashed()->withCount('deletions')->get()->each($restoreAction);
}
if ($entity instanceof Book) {
$entity->chapters()->withTrashed()->withCount('deletions')->get()->each($restoreAction);
}
return $count;
}
/**
* Destroy the given entity.
*
* @throws Exception
*/
public function destroyEntity(Entity $entity): int
{
if ($entity instanceof Page) {
return $this->destroyPage($entity);
}
if ($entity instanceof Chapter) {
return $this->destroyChapter($entity);
}
if ($entity instanceof Book) {
return $this->destroyBook($entity);
}
if ($entity instanceof Bookshelf) {
return $this->destroyShelf($entity);
}
return 0;
}
/**
* Update entity relations to remove or update outstanding connections.
*/
protected function destroyCommonRelations(Entity $entity)
{
Activity::removeEntity($entity);
$entity->views()->delete();
$entity->permissions()->delete();
$entity->tags()->delete();
$entity->comments()->delete();
$entity->jointPermissions()->delete();
$entity->searchTerms()->delete();
$entity->deletions()->delete();
$entity->favourites()->delete();
$entity->watches()->delete();
$entity->referencesTo()->delete();
$entity->referencesFrom()->delete();
if ($entity instanceof HasCoverImage && $entity->cover()->exists()) {
$imageService = app()->make(ImageService::class);
$imageService->destroy($entity->cover()->first());
}
}
}