BookStack/app/Uploads/ImageService.php
Dan Brown e703009d7f
Images: Added thin wrapper around image filesystem instances
Extracts duplicated required handling (Like path adjustment) out to
simpler storage disk instance which can be passed around.
2023-09-30 19:12:22 +01:00

440 lines
15 KiB
PHP

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