BookStack/app/Services/ImageService.php

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<?php namespace BookStack\Services;
use BookStack\Exceptions\ImageUploadException;
use BookStack\Image;
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use BookStack\User;
use Exception;
use Intervention\Image\Exception\NotSupportedException;
use Intervention\Image\ImageManager;
use Illuminate\Contracts\Filesystem\Factory as FileSystem;
use Illuminate\Contracts\Filesystem\Filesystem as FileSystemInstance;
use Illuminate\Contracts\Cache\Repository as Cache;
use Setting;
use Symfony\Component\HttpFoundation\File\UploadedFile;
class ImageService
{
protected $imageTool;
protected $fileSystem;
protected $cache;
/**
* @var FileSystemInstance
*/
protected $storageInstance;
protected $storageUrl;
/**
* ImageService constructor.
* @param $imageTool
* @param $fileSystem
* @param $cache
*/
public function __construct(ImageManager $imageTool, FileSystem $fileSystem, Cache $cache)
{
$this->imageTool = $imageTool;
$this->fileSystem = $fileSystem;
$this->cache = $cache;
}
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/**
* Saves a new image from an upload.
* @param UploadedFile $uploadedFile
* @param string $type
* @param int $uploadedTo
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* @return mixed
* @throws ImageUploadException
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*/
public function saveNewFromUpload(UploadedFile $uploadedFile, $type, $uploadedTo = 0)
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{
$imageName = $uploadedFile->getClientOriginalName();
$imageData = file_get_contents($uploadedFile->getRealPath());
return $this->saveNew($imageName, $imageData, $type, $uploadedTo);
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}
/**
* Gets an image from url and saves it to the database.
* @param $url
* @param string $type
* @param bool|string $imageName
* @return mixed
* @throws \Exception
*/
private function saveNewFromUrl($url, $type, $imageName = false)
{
$imageName = $imageName ? $imageName : basename($url);
$imageData = file_get_contents($url);
if($imageData === false) throw new \Exception('Cannot get image from ' . $url);
return $this->saveNew($imageName, $imageData, $type);
}
/**
* Saves a new image
* @param string $imageName
* @param string $imageData
* @param string $type
* @param int $uploadedTo
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* @return Image
* @throws ImageUploadException
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*/
private function saveNew($imageName, $imageData, $type, $uploadedTo = 0)
{
$storage = $this->getStorage();
$secureUploads = setting('app-secure-images');
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$imageName = str_replace(' ', '-', $imageName);
if ($secureUploads) $imageName = str_random(16) . '-' . $imageName;
$imagePath = '/uploads/images/' . $type . '/' . Date('Y-m-M') . '/';
while ($storage->exists($imagePath . $imageName)) {
$imageName = str_random(3) . $imageName;
}
$fullPath = $imagePath . $imageName;
try {
$storage->put($fullPath, $imageData);
$storage->setVisibility($fullPath, 'public');
} catch (Exception $e) {
throw new ImageUploadException('Image Path ' . $fullPath . ' is not writable by the server.');
}
$imageDetails = [
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'name' => $imageName,
'path' => $fullPath,
'url' => $this->getPublicUrl($fullPath),
'type' => $type,
'uploaded_to' => $uploadedTo
];
if (auth()->user() && auth()->user()->id !== 0) {
$userId = auth()->user()->id;
$imageDetails['created_by'] = $userId;
$imageDetails['updated_by'] = $userId;
}
$image = Image::forceCreate($imageDetails);
return $image;
}
/**
* 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.
*
* @param Image $image
* @param int $width
* @param int $height
* @param bool $keepRatio
* @return string
* @throws Exception
* @throws ImageUploadException
*/
public function getThumbnail(Image $image, $width = 220, $height = 220, $keepRatio = false)
{
$thumbDirName = '/' . ($keepRatio ? 'scaled-' : 'thumbs-') . $width . '-' . $height . '/';
$thumbFilePath = dirname($image->path) . $thumbDirName . basename($image->path);
if ($this->cache->has('images-' . $image->id . '-' . $thumbFilePath) && $this->cache->get('images-' . $thumbFilePath)) {
return $this->getPublicUrl($thumbFilePath);
}
$storage = $this->getStorage();
if ($storage->exists($thumbFilePath)) {
return $this->getPublicUrl($thumbFilePath);
}
try {
$thumb = $this->imageTool->make($storage->get($image->path));
} catch (Exception $e) {
if ($e instanceof \ErrorException || $e instanceof NotSupportedException) {
throw new ImageUploadException('The server cannot create thumbnails. Please check you have the GD PHP extension installed.');
} else {
throw $e;
}
}
if ($keepRatio) {
$thumb->resize($width, null, function ($constraint) {
$constraint->aspectRatio();
$constraint->upsize();
});
} else {
$thumb->fit($width, $height);
}
$thumbData = (string)$thumb->encode();
$storage->put($thumbFilePath, $thumbData);
$storage->setVisibility($thumbFilePath, 'public');
$this->cache->put('images-' . $image->id . '-' . $thumbFilePath, $thumbFilePath, 60 * 72);
return $this->getPublicUrl($thumbFilePath);
}
/**
* Destroys an Image object along with its files and thumbnails.
* @param Image $image
* @return bool
*/
public function destroyImage(Image $image)
{
$storage = $this->getStorage();
$imageFolder = dirname($image->path);
$imageFileName = basename($image->path);
$allImages = collect($storage->allFiles($imageFolder));
$imagesToDelete = $allImages->filter(function ($imagePath) use ($imageFileName) {
$expectedIndex = strlen($imagePath) - strlen($imageFileName);
return strpos($imagePath, $imageFileName) === $expectedIndex;
});
$storage->delete($imagesToDelete->all());
// Cleanup of empty folders
foreach ($storage->directories($imageFolder) as $directory) {
if ($this->isFolderEmpty($directory)) $storage->deleteDirectory($directory);
}
if ($this->isFolderEmpty($imageFolder)) $storage->deleteDirectory($imageFolder);
$image->delete();
return true;
}
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/**
* Save a gravatar image and set a the profile image for a user.
* @param User $user
* @param int $size
* @return mixed
*/
public function saveUserGravatar(User $user, $size = 500)
{
$emailHash = md5(strtolower(trim($user->email)));
$url = 'http://www.gravatar.com/avatar/' . $emailHash . '?s=' . $size . '&d=identicon';
$imageName = str_replace(' ', '-', $user->name . '-gravatar.png');
$image = $this->saveNewFromUrl($url, 'user', $imageName);
$image->created_by = $user->id;
$image->updated_by = $user->id;
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$image->save();
return $image;
}
/**
* Get the storage that will be used for storing images.
* @return FileSystemInstance
*/
private function getStorage()
{
if ($this->storageInstance !== null) return $this->storageInstance;
$storageType = config('filesystems.default');
$this->storageInstance = $this->fileSystem->disk($storageType);
return $this->storageInstance;
}
/**
* Check whether or not a folder is empty.
* @param $path
* @return int
*/
private function isFolderEmpty($path)
{
$files = $this->getStorage()->files($path);
$folders = $this->getStorage()->directories($path);
return count($files) === 0 && count($folders) === 0;
}
/**
* Gets a public facing url for an image by checking relevant environment variables.
* @param $filePath
* @return string
*/
private function getPublicUrl($filePath)
{
if ($this->storageUrl === null) {
$storageUrl = config('filesystems.url');
// Get the standard public s3 url if s3 is set as storage type
if ($storageUrl == false && config('filesystems.default') === 's3') {
$storageDetails = config('filesystems.disks.s3');
$storageUrl = 'https://s3-' . $storageDetails['region'] . '.amazonaws.com/' . $storageDetails['bucket'];
}
$this->storageUrl = $storageUrl;
}
return ($this->storageUrl == false ? '' : rtrim($this->storageUrl, '/')) . $filePath;
}
}