mirror of
https://github.com/BookStackApp/BookStack.git
synced 2024-10-01 01:36:00 -04:00
492 lines
17 KiB
PHP
492 lines
17 KiB
PHP
<?php
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namespace BookStack\Uploads;
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use BookStack\Entities\Models\Book;
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use BookStack\Entities\Models\Bookshelf;
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use BookStack\Entities\Models\Page;
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use BookStack\Exceptions\ImageUploadException;
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use ErrorException;
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use Exception;
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use Illuminate\Contracts\Cache\Repository as Cache;
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use Illuminate\Contracts\Filesystem\FileNotFoundException;
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use Illuminate\Contracts\Filesystem\Filesystem as StorageDisk;
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use Illuminate\Filesystem\FilesystemAdapter;
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use Illuminate\Filesystem\FilesystemManager;
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use Illuminate\Support\Facades\DB;
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use Illuminate\Support\Facades\Log;
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use Illuminate\Support\Str;
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use Intervention\Image\Exception\NotSupportedException;
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use Intervention\Image\ImageManager;
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use Symfony\Component\HttpFoundation\File\UploadedFile;
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use Symfony\Component\HttpFoundation\StreamedResponse;
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class ImageService
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{
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protected static array $supportedExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
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public function __construct(
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protected ImageManager $imageTool,
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protected FilesystemManager $fileSystem,
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protected Cache $cache,
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protected ImageStorage $storage,
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) {
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}
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/**
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* Saves a new image from an upload.
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*
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* @throws ImageUploadException
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*/
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public function saveNewFromUpload(
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UploadedFile $uploadedFile,
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string $type,
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int $uploadedTo = 0,
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int $resizeWidth = null,
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int $resizeHeight = null,
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bool $keepRatio = true
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): Image {
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$imageName = $uploadedFile->getClientOriginalName();
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$imageData = file_get_contents($uploadedFile->getRealPath());
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if ($resizeWidth !== null || $resizeHeight !== null) {
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$imageData = $this->resizeImage($imageData, $resizeWidth, $resizeHeight, $keepRatio);
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}
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return $this->saveNew($imageName, $imageData, $type, $uploadedTo);
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}
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/**
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* Save a new image from a uri-encoded base64 string of data.
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*
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* @throws ImageUploadException
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*/
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public function saveNewFromBase64Uri(string $base64Uri, string $name, string $type, int $uploadedTo = 0): Image
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{
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$splitData = explode(';base64,', $base64Uri);
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if (count($splitData) < 2) {
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throw new ImageUploadException('Invalid base64 image data provided');
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}
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$data = base64_decode($splitData[1]);
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return $this->saveNew($name, $data, $type, $uploadedTo);
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}
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/**
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* Save a new image into storage.
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*
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* @throws ImageUploadException
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*/
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public function saveNew(string $imageName, string $imageData, string $type, int $uploadedTo = 0): Image
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{
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$disk = $this->storage->getDisk($type);
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$secureUploads = setting('app-secure-images');
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$fileName = $this->storage->cleanImageFileName($imageName);
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$imagePath = '/uploads/images/' . $type . '/' . date('Y-m') . '/';
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while ($disk->exists($this->storage->adjustPathForDisk($imagePath . $fileName, $type))) {
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$fileName = Str::random(3) . $fileName;
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}
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$fullPath = $imagePath . $fileName;
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if ($secureUploads) {
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$fullPath = $imagePath . Str::random(16) . '-' . $fileName;
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}
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try {
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$this->storage->storeInPublicSpace($disk, $this->storage->adjustPathForDisk($fullPath, $type), $imageData);
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} catch (Exception $e) {
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Log::error('Error when attempting image upload:' . $e->getMessage());
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throw new ImageUploadException(trans('errors.path_not_writable', ['filePath' => $fullPath]));
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}
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$imageDetails = [
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'name' => $imageName,
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'path' => $fullPath,
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'url' => $this->storage->getPublicUrl($fullPath),
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'type' => $type,
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'uploaded_to' => $uploadedTo,
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];
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if (user()->id !== 0) {
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$userId = user()->id;
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$imageDetails['created_by'] = $userId;
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$imageDetails['updated_by'] = $userId;
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}
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$image = (new Image())->forceFill($imageDetails);
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$image->save();
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return $image;
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}
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/**
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* Replace an existing image file in the system using the given file.
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*/
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public function replaceExistingFromUpload(string $path, string $type, UploadedFile $file): void
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{
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$imageData = file_get_contents($file->getRealPath());
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$disk = $this->storage->getDisk($type);
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$adjustedPath = $this->storage->adjustPathForDisk($path, $type);
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$disk->put($adjustedPath, $imageData);
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}
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/**
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* Checks if the image is a gif. Returns true if it is, else false.
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*/
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protected function isGif(Image $image): bool
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{
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return strtolower(pathinfo($image->path, PATHINFO_EXTENSION)) === 'gif';
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}
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/**
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* Check if the given image and image data is apng.
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*/
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protected function isApngData(Image $image, string &$imageData): bool
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{
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$isPng = strtolower(pathinfo($image->path, PATHINFO_EXTENSION)) === 'png';
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if (!$isPng) {
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return false;
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}
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$initialHeader = substr($imageData, 0, strpos($imageData, 'IDAT'));
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return str_contains($initialHeader, 'acTL');
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}
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/**
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* Get the thumbnail for an image.
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* If $keepRatio is true only the width will be used.
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* Checks the cache then storage to avoid creating / accessing the filesystem on every check.
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*
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* @throws Exception
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*/
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public function getThumbnail(
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Image $image,
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?int $width,
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?int $height,
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bool $keepRatio = false,
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bool $shouldCreate = false,
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bool $canCreate = false,
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): ?string {
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// Do not resize GIF images where we're not cropping
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if ($keepRatio && $this->isGif($image)) {
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return $this->storage->getPublicUrl($image->path);
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}
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$thumbDirName = '/' . ($keepRatio ? 'scaled-' : 'thumbs-') . $width . '-' . $height . '/';
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$imagePath = $image->path;
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$thumbFilePath = dirname($imagePath) . $thumbDirName . basename($imagePath);
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$thumbCacheKey = 'images::' . $image->id . '::' . $thumbFilePath;
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// Return path if in cache
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$cachedThumbPath = $this->cache->get($thumbCacheKey);
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if ($cachedThumbPath && !$shouldCreate) {
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return $this->storage->getPublicUrl($cachedThumbPath);
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}
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// If thumbnail has already been generated, serve that and cache path
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$disk = $this->storage->getDisk($image->type);
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if (!$shouldCreate && $disk->exists($this->storage->adjustPathForDisk($thumbFilePath, $image->type))) {
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$this->cache->put($thumbCacheKey, $thumbFilePath, 60 * 60 * 72);
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return $this->storage->getPublicUrl($thumbFilePath);
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}
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$imageData = $disk->get($this->storage->adjustPathForDisk($imagePath, $image->type));
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// Do not resize apng images where we're not cropping
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if ($keepRatio && $this->isApngData($image, $imageData)) {
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$this->cache->put($thumbCacheKey, $image->path, 60 * 60 * 72);
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return $this->storage->getPublicUrl($image->path);
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}
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if (!$shouldCreate && !$canCreate) {
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return null;
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}
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// If not in cache and thumbnail does not exist, generate thumb and cache path
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$thumbData = $this->resizeImage($imageData, $width, $height, $keepRatio);
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$this->storage->storeInPublicSpace($disk, $this->storage->adjustPathForDisk($thumbFilePath, $image->type), $thumbData);
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$this->cache->put($thumbCacheKey, $thumbFilePath, 60 * 60 * 72);
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return $this->storage->getPublicUrl($thumbFilePath);
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}
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/**
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* Resize the image of given data to the specified size, and return the new image data.
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*
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* @throws ImageUploadException
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*/
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protected function resizeImage(string $imageData, ?int $width, ?int $height, bool $keepRatio): string
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{
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try {
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$thumb = $this->imageTool->make($imageData);
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} catch (ErrorException | NotSupportedException $e) {
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throw new ImageUploadException(trans('errors.cannot_create_thumbs'));
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}
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$this->orientImageToOriginalExif($thumb, $imageData);
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if ($keepRatio) {
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$thumb->resize($width, $height, function ($constraint) {
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$constraint->aspectRatio();
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$constraint->upsize();
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});
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} else {
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$thumb->fit($width, $height);
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}
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$thumbData = (string) $thumb->encode();
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// Use original image data if we're keeping the ratio
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// and the resizing does not save any space.
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if ($keepRatio && strlen($thumbData) > strlen($imageData)) {
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return $imageData;
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}
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return $thumbData;
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}
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/**
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* Get the raw data content from an image.
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*
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* @throws Exception
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*/
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public function getImageData(Image $image): string
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{
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$disk = $this->storage->getDisk();
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return $disk->get($this->storage->adjustPathForDisk($image->path, $image->type));
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}
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/**
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* Destroy an image along with its revisions, thumbnails and remaining folders.
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*
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* @throws Exception
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*/
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public function destroy(Image $image)
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{
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$this->destroyImagesFromPath($image->path, $image->type);
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$image->delete();
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}
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/**
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* Destroys an image at the given path.
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* Searches for image thumbnails in addition to main provided path.
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*/
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protected function destroyImagesFromPath(string $path, string $imageType): bool
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{
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$path = $this->storage->adjustPathForDisk($path, $imageType);
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$disk = $this->storage->getDisk($imageType);
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$imageFolder = dirname($path);
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$imageFileName = basename($path);
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$allImages = collect($disk->allFiles($imageFolder));
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// Delete image files
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$imagesToDelete = $allImages->filter(function ($imagePath) use ($imageFileName) {
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return basename($imagePath) === $imageFileName;
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});
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$disk->delete($imagesToDelete->all());
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// Cleanup of empty folders
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$foldersInvolved = array_merge([$imageFolder], $disk->directories($imageFolder));
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foreach ($foldersInvolved as $directory) {
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if ($this->isFolderEmpty($disk, $directory)) {
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$disk->deleteDirectory($directory);
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}
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}
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return true;
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}
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/**
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* Check whether a folder is empty.
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*/
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protected function isFolderEmpty(StorageDisk $storage, string $path): bool
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{
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$files = $storage->files($path);
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$folders = $storage->directories($path);
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return count($files) === 0 && count($folders) === 0;
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}
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/**
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* Delete gallery and drawings that are not within HTML content of pages or page revisions.
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* Checks based off of only the image name.
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* Could be much improved to be more specific but kept it generic for now to be safe.
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*
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* Returns the path of the images that would be/have been deleted.
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*/
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public function deleteUnusedImages(bool $checkRevisions = true, bool $dryRun = true)
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{
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$types = ['gallery', 'drawio'];
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$deletedPaths = [];
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Image::query()->whereIn('type', $types)
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->chunk(1000, function ($images) use ($checkRevisions, &$deletedPaths, $dryRun) {
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/** @var Image $image */
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foreach ($images as $image) {
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$searchQuery = '%' . basename($image->path) . '%';
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$inPage = DB::table('pages')
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->where('html', 'like', $searchQuery)->count() > 0;
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$inRevision = false;
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if ($checkRevisions) {
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$inRevision = DB::table('page_revisions')
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->where('html', 'like', $searchQuery)->count() > 0;
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}
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if (!$inPage && !$inRevision) {
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$deletedPaths[] = $image->path;
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if (!$dryRun) {
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$this->destroy($image);
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}
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}
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}
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});
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return $deletedPaths;
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}
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/**
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* Convert an image URI to a Base64 encoded string.
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* Attempts to convert the URL to a system storage url then
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* fetch the data from the disk or storage location.
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* Returns null if the image data cannot be fetched from storage.
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*
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* @throws FileNotFoundException
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*/
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public function imageUrlToBase64(string $url): ?string
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{
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$storagePath = $this->storage->urlToPath($url);
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if (empty($url) || is_null($storagePath)) {
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return null;
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}
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$storagePath = $this->storage->adjustPathForDisk($storagePath);
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// Apply access control when local_secure_restricted images are active
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if ($this->storage->usingSecureRestrictedImages()) {
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if (!$this->checkUserHasAccessToRelationOfImageAtPath($storagePath)) {
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return null;
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}
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}
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$disk = $this->storage->getDisk();
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$imageData = null;
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if ($disk->exists($storagePath)) {
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$imageData = $disk->get($storagePath);
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}
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if (is_null($imageData)) {
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return null;
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}
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$extension = pathinfo($url, PATHINFO_EXTENSION);
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if ($extension === 'svg') {
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$extension = 'svg+xml';
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}
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return 'data:image/' . $extension . ';base64,' . base64_encode($imageData);
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}
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/**
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* Check if the given path exists and is accessible in the local secure image system.
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* Returns false if local_secure is not in use, if the file does not exist, if the
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* file is likely not a valid image, or if permission does not allow access.
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*/
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public function pathAccessibleInLocalSecure(string $imagePath): bool
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{
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$disk = $this->storage->getDisk('gallery');
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if ($this->storage->usingSecureRestrictedImages() && !$this->checkUserHasAccessToRelationOfImageAtPath($imagePath)) {
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return false;
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}
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// Check local_secure is active
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return $this->storage->usingSecureImages()
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&& $disk instanceof FilesystemAdapter
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// Check the image file exists
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&& $disk->exists($imagePath)
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// Check the file is likely an image file
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&& str_starts_with($disk->mimeType($imagePath), 'image/');
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}
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/**
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* Check that the current user has access to the relation
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* of the image at the given path.
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*/
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protected function checkUserHasAccessToRelationOfImageAtPath(string $path): bool
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{
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if (str_starts_with($path, '/uploads/images/')) {
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$path = substr($path, 15);
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}
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// Strip thumbnail element from path if existing
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$originalPathSplit = array_filter(explode('/', $path), function (string $part) {
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$resizedDir = (str_starts_with($part, 'thumbs-') || str_starts_with($part, 'scaled-'));
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$missingExtension = !str_contains($part, '.');
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return !($resizedDir && $missingExtension);
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});
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// Build a database-format image path and search for the image entry
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$fullPath = '/uploads/images/' . ltrim(implode('/', $originalPathSplit), '/');
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$image = Image::query()->where('path', '=', $fullPath)->first();
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if (is_null($image)) {
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return false;
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}
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$imageType = $image->type;
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// Allow user or system (logo) images
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// (No specific relation control but may still have access controlled by auth)
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if ($imageType === 'user' || $imageType === 'system') {
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return true;
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}
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if ($imageType === 'gallery' || $imageType === 'drawio') {
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return Page::visible()->where('id', '=', $image->uploaded_to)->exists();
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}
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if ($imageType === 'cover_book') {
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return Book::visible()->where('id', '=', $image->uploaded_to)->exists();
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}
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if ($imageType === 'cover_bookshelf') {
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return Bookshelf::visible()->where('id', '=', $image->uploaded_to)->exists();
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}
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return false;
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}
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/**
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* For the given path, if existing, provide a response that will stream the image contents.
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*/
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public function streamImageFromStorageResponse(string $imageType, string $path): StreamedResponse
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{
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$disk = $this->storage->getDisk($imageType);
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return $disk->response($path);
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}
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/**
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* Check if the given image extension is supported by BookStack.
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* The extension must not be altered in this function. This check should provide a guarantee
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* that the provided extension is safe to use for the image to be saved.
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*/
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public static function isExtensionSupported(string $extension): bool
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{
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return in_array($extension, static::$supportedExtensions);
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}
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}
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