Merge pull request #15870 from nextcloud/preview-provider-v2

Add new Provider interface for preview providers

lib/composer/composer/autoload_classmap.php

@@ -354,6 +354,7 @@ return array(
     'OCP\\OCS\\IDiscoveryService' => $baseDir . '/lib/public/OCS/IDiscoveryService.php',
     'OCP\\PreConditionNotMetException' => $baseDir . '/lib/public/PreConditionNotMetException.php',
     'OCP\\Preview\\IProvider' => $baseDir . '/lib/public/Preview/IProvider.php',
+    'OCP\\Preview\\IProviderV2' => $baseDir . '/lib/public/Preview/IProviderV2.php',
     'OCP\\Remote\\Api\\IApiCollection' => $baseDir . '/lib/public/Remote/Api/IApiCollection.php',
     'OCP\\Remote\\Api\\IApiFactory' => $baseDir . '/lib/public/Remote/Api/IApiFactory.php',
     'OCP\\Remote\\Api\\ICapabilitiesApi' => $baseDir . '/lib/public/Remote/Api/ICapabilitiesApi.php',
@@ -1022,6 +1023,8 @@ return array(
     'OC\\Preview\\Photoshop' => $baseDir . '/lib/private/Preview/Photoshop.php',
     'OC\\Preview\\Postscript' => $baseDir . '/lib/private/Preview/Postscript.php',
     'OC\\Preview\\Provider' => $baseDir . '/lib/private/Preview/Provider.php',
+    'OC\\Preview\\ProviderV1Adapter' => $baseDir . '/lib/private/Preview/ProviderV1Adapter.php',
+    'OC\\Preview\\ProviderV2' => $baseDir . '/lib/private/Preview/ProviderV2.php',
     'OC\\Preview\\SVG' => $baseDir . '/lib/private/Preview/SVG.php',
     'OC\\Preview\\StarOffice' => $baseDir . '/lib/private/Preview/StarOffice.php',
     'OC\\Preview\\TIFF' => $baseDir . '/lib/private/Preview/TIFF.php',

lib/composer/composer/autoload_static.php

@@ -388,6 +388,7 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OCP\\OCS\\IDiscoveryService' => __DIR__ . '/../../..' . '/lib/public/OCS/IDiscoveryService.php',
         'OCP\\PreConditionNotMetException' => __DIR__ . '/../../..' . '/lib/public/PreConditionNotMetException.php',
         'OCP\\Preview\\IProvider' => __DIR__ . '/../../..' . '/lib/public/Preview/IProvider.php',
+        'OCP\\Preview\\IProviderV2' => __DIR__ . '/../../..' . '/lib/public/Preview/IProviderV2.php',
         'OCP\\Remote\\Api\\IApiCollection' => __DIR__ . '/../../..' . '/lib/public/Remote/Api/IApiCollection.php',
         'OCP\\Remote\\Api\\IApiFactory' => __DIR__ . '/../../..' . '/lib/public/Remote/Api/IApiFactory.php',
         'OCP\\Remote\\Api\\ICapabilitiesApi' => __DIR__ . '/../../..' . '/lib/public/Remote/Api/ICapabilitiesApi.php',
@@ -1056,6 +1057,8 @@ class ComposerStaticInit53792487c5a8370acc0b06b1a864ff4c
         'OC\\Preview\\Photoshop' => __DIR__ . '/../../..' . '/lib/private/Preview/Photoshop.php',
         'OC\\Preview\\Postscript' => __DIR__ . '/../../..' . '/lib/private/Preview/Postscript.php',
         'OC\\Preview\\Provider' => __DIR__ . '/../../..' . '/lib/private/Preview/Provider.php',
+        'OC\\Preview\\ProviderV1Adapter' => __DIR__ . '/../../..' . '/lib/private/Preview/ProviderV1Adapter.php',
+        'OC\\Preview\\ProviderV2' => __DIR__ . '/../../..' . '/lib/private/Preview/ProviderV2.php',
         'OC\\Preview\\SVG' => __DIR__ . '/../../..' . '/lib/private/Preview/SVG.php',
         'OC\\Preview\\StarOffice' => __DIR__ . '/../../..' . '/lib/private/Preview/StarOffice.php',
         'OC\\Preview\\TIFF' => __DIR__ . '/../../..' . '/lib/private/Preview/TIFF.php',

lib/private/Preview/BMP.php

@@ -26,7 +26,7 @@ class BMP extends Image {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/bmp/';
 	}
 }

lib/private/Preview/Bitmap.php

@@ -26,44 +26,43 @@
 namespace OC\Preview;
 
 use Imagick;
+use OCP\IImage;
 use OCP\ILogger;
+use OCP\Files\File;
 
 /**
  * Creates a PNG preview using ImageMagick via the PECL extension
  *
  * @package OC\Preview
  */
-abstract class Bitmap extends Provider {
+abstract class Bitmap extends ProviderV2 {
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 
-		$tmpPath = $fileview->toTmpFile($path);
-		if (!$tmpPath) {
-			return false;
-		}
+		$tmpPath = $this->getLocalFile($file);
 
 		// Creates \Imagick object from bitmap or vector file
 		try {
 			$bp = $this->getResizedPreview($tmpPath, $maxX, $maxY);
 		} catch (\Exception $e) {
 			\OC::$server->getLogger()->logException($e, [
-				'message' => 'File: ' . $fileview->getAbsolutePath($path) . ' Imagick says:',
+				'message' => 'File: ' . $file->getPath() . ' Imagick says:',
 				'level' => ILogger::ERROR,
 				'app' => 'core',
 			]);
-			return false;
+			return null;
 		}
 
-		unlink($tmpPath);
+		$this->cleanTmpFiles();
 
 		//new bitmap image object
 		$image = new \OC_Image();
 		$image->loadFromData($bp);
 		//check if image object is valid
-		return $image->valid() ? $image : false;
+		return $image->valid() ? $image : null;
 	}
 
 	/**

lib/private/Preview/Font.php

@@ -27,7 +27,7 @@ class Font extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/(?:font-sfnt|x-font$)/';
 	}
-}
+}

lib/private/Preview/GIF.php

@@ -26,7 +26,7 @@ class GIF extends Image {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/gif/';
 	}
 }

lib/private/Preview/Generator.php

@@ -35,6 +35,8 @@ use OCP\IConfig;
 use OCP\IImage;
 use OCP\IPreview;
 use OCP\Preview\IProvider;
+use OCP\Preview\IProviderV2;
+use OCP\Preview\IVersionedPreviewFile;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
 
@@ -178,9 +180,9 @@ class Generator {
 				continue;
 			}
 
-			foreach ($providers as $provider) {
-				$provider = $this->helper->getProvider($provider);
-				if (!($provider instanceof IProvider)) {
+			foreach ($providers as $providerClosure) {
+				$provider = $this->helper->getProvider($providerClosure);
+				if (!($provider instanceof IProviderV2)) {
 					continue;
 				}
 

lib/private/Preview/GeneratorHelper.php

@@ -30,6 +30,7 @@ use OCP\IConfig;
 use OCP\IImage;
 use OCP\Image as OCPImage;
 use OCP\Preview\IProvider;
+use OCP\Preview\IProviderV2;
 
 /**
  * Very small wrapper class to make the generator fully unit testable
@@ -54,21 +55,8 @@ class GeneratorHelper {
 	 * @param int $maxHeight
 	 * @return bool|IImage
 	 */
-	public function getThumbnail(IProvider $provider, File $file, $maxWidth, $maxHeight) {
-		list($view, $path) = $this->getViewAndPath($file);
-		return $provider->getThumbnail($path, $maxWidth, $maxHeight, false, $view);
-	}
-
-	/**
-	 * @param File $file
-	 * @return array
-	 * This is required to create the old view and path
-	 */
-	private function getViewAndPath(File $file) {
-		$view = new View($file->getParent()->getPath());
-		$path = $file->getName();
-
-		return [$view, $path];
+	public function getThumbnail(IProviderV2 $provider, File $file, $maxWidth, $maxHeight) {
+		return $provider->getThumbnail($file, $maxWidth, $maxHeight);
 	}
 
 	/**
@@ -82,10 +70,14 @@ class GeneratorHelper {
 	}
 
 	/**
-	 * @param $provider
-	 * @return IProvider
+	 * @param callable $providerClosure
+	 * @return IProviderV2
 	 */
-	public function getProvider($provider) {
-		return $provider();
+	public function getProvider($providerClosure) {
+		$provider = $providerClosure();
+		if ($provider instanceof IProvider) {
+			$provider = new ProviderV1Adapter($provider);
+		}
+		return $provider;
 	}
 }

lib/private/Preview/HEIC.php

@@ -23,14 +23,16 @@ declare(strict_types=1);
 
 namespace OC\Preview;
 
+use OCP\IImage;
 use OCP\ILogger;
+use OCP\Files\File;
 
 /**
  * Creates a JPG preview using ImageMagick via the PECL extension
  *
  * @package OC\Preview
  */
-class HEIC extends Provider {
+class HEIC extends ProviderV2 {
 	/**
 	 * {@inheritDoc}
 	 */
@@ -48,11 +50,8 @@ class HEIC extends Provider {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
-		$tmpPath = $fileview->toTmpFile($path);
-		if (!$tmpPath) {
-			return false;
-		}
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		$tmpPath = $this->getLocalFile($file);
 
 		// Creates \Imagick object from the heic file
 		try {
@@ -60,20 +59,20 @@ class HEIC extends Provider {
 			$bp->setFormat('jpg');
 		} catch (\Exception $e) {
 			\OC::$server->getLogger()->logException($e, [
-				'message' => 'File: ' . $fileview->getAbsolutePath($path) . ' Imagick says:',
+				'message' => 'File: ' . $file->getPath() . ' Imagick says:',
 				'level' => ILogger::ERROR,
 				'app' => 'core',
 			]);
-			return false;
+			return null;
 		}
 
-		unlink($tmpPath);
+		$this->cleanTmpFiles();
 
 		//new bitmap image object
 		$image = new \OC_Image();
 		$image->loadFromData($bp);
 		//check if image object is valid
-		return $image->valid() ? $image : false;
+		return $image->valid() ? $image : null;
 	}
 
 	/**

lib/private/Preview/Illustrator.php

@@ -28,7 +28,7 @@ class Illustrator extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/illustrator/';
 	}
 }

lib/private/Preview/Image.php

@@ -27,44 +27,37 @@
  */
 namespace OC\Preview;
 
-abstract class Image extends Provider {
+use OCP\Files\File;
+use OCP\IImage;
+
+abstract class Image extends ProviderV2 {
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
-		//get fileinfo
-		$fileInfo = $fileview->getFileInfo($path);
-		if (!$fileInfo) {
-			return false;
-		}
-
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 		$maxSizeForImages = \OC::$server->getConfig()->getSystemValue('preview_max_filesize_image', 50);
-		$size = $fileInfo->getSize();
+		$size = $file->getSize();
 
 		if ($maxSizeForImages !== -1 && $size > ($maxSizeForImages * 1024 * 1024)) {
-			return false;
+			return null;
 		}
 
 		$image = new \OC_Image();
 
-		$useTempFile = $fileInfo->isEncrypted() || !$fileInfo->getStorage()->isLocal();
-		if ($useTempFile) {
-			$fileName = $fileview->toTmpFile($path);
-		} else {
-			$fileName = $fileview->getLocalFile($path);
-		}
+		$fileName = $this->getLocalFile($file);
+
 		$image->loadFromFile($fileName);
 		$image->fixOrientation();
-		if ($useTempFile) {
-			unlink($fileName);
-		}
+
+		$this->cleanTmpFiles();
+
 		if ($image->valid()) {
 			$image->scaleDownToFit($maxX, $maxY);
 
 			return $image;
 		}
-		return false;
+		return null;
 	}
 
 }

lib/private/Preview/JPEG.php

@@ -26,7 +26,7 @@ class JPEG extends Image {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/jpeg/';
 	}
 }

lib/private/Preview/MP3.php

@@ -28,23 +28,26 @@ namespace OC\Preview;
 
 use ID3Parser\ID3Parser;
 
-class MP3 extends Provider {
+use OCP\Files\File;
+use OCP\IImage;
+
+class MP3 extends ProviderV2 {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/audio\/mpeg/';
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 		$getID3 = new ID3Parser();
 
-		$tmpPath = $fileview->toTmpFile($path);
+		$tmpPath = $this->getLocalFile($file);
 		$tags = $getID3->analyze($tmpPath);
-		unlink($tmpPath);
+		$this->cleanTmpFiles();
 		$picture = isset($tags['id3v2']['APIC'][0]['data']) ? $tags['id3v2']['APIC'][0]['data'] : null;
 		if(is_null($picture) && isset($tags['id3v2']['PIC'][0]['data'])) {
 			$picture = $tags['id3v2']['PIC'][0]['data'];
@@ -61,6 +64,6 @@ class MP3 extends Provider {
 			}
 		}
 
-		return false;
+		return null;
 	}
 }

lib/private/Preview/MSOffice2003.php

@@ -26,7 +26,7 @@ class MSOffice2003 extends Office {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/vnd.ms-.*/';
 	}
 }

lib/private/Preview/MSOffice2007.php

@@ -26,7 +26,7 @@ class MSOffice2007 extends Office {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/vnd.openxmlformats-officedocument.*/';
 	}
 }

lib/private/Preview/MSOfficeDoc.php

@@ -26,7 +26,7 @@ class MSOfficeDoc extends Office {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/msword/';
 	}
 }

lib/private/Preview/MarkDown.php

@@ -25,7 +25,7 @@ class MarkDown extends TXT {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/text\/(x-)?markdown/';
 	}
 

lib/private/Preview/Movie.php

@@ -25,38 +25,27 @@
  */
 namespace OC\Preview;
 
-class Movie extends Provider {
+use OCP\Files\File;
+use OCP\IImage;
+
+class Movie extends ProviderV2 {
 	public static $avconvBinary;
 	public static $ffmpegBinary;
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/video\/.*/';
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 		// TODO: use proc_open() and stream the source file ?
 
-		$fileInfo = $fileview->getFileInfo($path);
-		$useFileDirectly = (!$fileInfo->isEncrypted() && !$fileInfo->isMounted());
-
-		if ($useFileDirectly) {
-			$absPath = $fileview->getLocalFile($path);
-		} else {
-			$absPath = \OC::$server->getTempManager()->getTemporaryFile();
-
-			$handle = $fileview->fopen($path, 'rb');
-
-			// we better use 5MB (1024 * 1024 * 5 = 5242880) instead of 1MB.
-			// in some cases 1MB was no enough to generate thumbnail
-			$firstmb = stream_get_contents($handle, 5242880);
-			file_put_contents($absPath, $firstmb);
-		}
+		$absPath = $this->getLocalFile($file, 5242880); // only use the first 5MB
 
 		$result = $this->generateThumbNail($maxX, $maxY, $absPath, 5);
 		if ($result === false) {
@@ -66,9 +55,7 @@ class Movie extends Provider {
 			}
 		}
 
-		if (!$useFileDirectly) {
-			unlink($absPath);
-		}
+		$this->cleanTmpFiles();
 
 		return $result;
 	}
@@ -78,9 +65,9 @@ class Movie extends Provider {
 	 * @param int $maxY
 	 * @param string $absPath
 	 * @param int $second
-	 * @return bool|\OCP\IImage
+	 * @return null|\OCP\IImage
 	 */
-	private function generateThumbNail($maxX, $maxY, $absPath, $second) {
+	private function generateThumbNail($maxX, $maxY, $absPath, $second): ?IImage {
 		$tmpPath = \OC::$server->getTempManager()->getTemporaryFile();
 
 		if (self::$avconvBinary) {
@@ -109,6 +96,6 @@ class Movie extends Provider {
 			}
 		}
 		unlink($tmpPath);
-		return false;
+		return null;
 	}
 }

lib/private/Preview/Office.php

@@ -25,21 +25,23 @@
  */
 namespace OC\Preview;
 
+use OCP\IImage;
 use OCP\ILogger;
+use OCP\Files\File;
 
-abstract class Office extends Provider {
+abstract class Office extends ProviderV2 {
 	private $cmd;
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 		$this->initCmd();
 		if (is_null($this->cmd)) {
-			return false;
+			return null;
 		}
 
-		$absPath = $fileview->toTmpFile($path);
+		$absPath = $this->getLocalFile($file);
 
 		$tmpDir = \OC::$server->getTempManager()->getTempBaseDir();
 
@@ -59,19 +61,19 @@ abstract class Office extends Provider {
 			$png = new \imagick($pngPreview . '[0]');
 			$png->setImageFormat('jpg');
 		} catch (\Exception $e) {
-			unlink($absPath);
+			$this->cleanTmpFiles();
 			unlink($pngPreview);
 			\OC::$server->getLogger()->logException($e, [
 				'level' => ILogger::ERROR,
 				'app' => 'core',
 			]);
-			return false;
+			return null;
 		}
 
 		$image = new \OC_Image();
 		$image->loadFromData($png);
 
-		unlink($absPath);
+		$this->cleanTmpFiles();
 		unlink($pngPreview);
 
 		if ($image->valid()) {
@@ -79,7 +81,7 @@ abstract class Office extends Provider {
 
 			return $image;
 		}
-		return false;
+		return null;
 
 	}
 

lib/private/Preview/OpenDocument.php

@@ -26,7 +26,7 @@ class OpenDocument extends Office {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/vnd.oasis.opendocument.*/';
 	}
 }

lib/private/Preview/PDF.php

@@ -28,7 +28,7 @@ class PDF extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/pdf/';
 	}
 }

lib/private/Preview/PNG.php

@@ -26,7 +26,7 @@ class PNG extends Image {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/png/';
 	}
 }

lib/private/Preview/Photoshop.php

@@ -28,7 +28,7 @@ class Photoshop extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/x-photoshop/';
 	}
 }

lib/private/Preview/Postscript.php

@@ -28,7 +28,7 @@ class Postscript extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/postscript/';
 	}
 }

lib/private/Preview/ProviderV1Adapter.php

@@ -0,0 +1,59 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Preview;
+
+use OC\Files\View;
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+use OCP\Preview\IProvider;
+use OCP\Preview\IProviderV2;
+
+class ProviderV1Adapter implements IProviderV2 {
+	private $providerV1;
+
+	public function __construct(IProvider $providerV1) {
+		$this->providerV1 = $providerV1;
+	}
+
+	public function getMimeType(): string {
+		return $this->providerV1->getMimeType();
+	}
+
+	public function isAvailable(FileInfo $file): bool {
+		return $this->isAvailable($file);
+	}
+
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		list($view, $path) = $this->getViewAndPath($file);
+		$thumbnail = $this->providerV1->getThumbnail($path, $maxX, $maxY, false, $view);
+		return $thumbnail === false ? null: $thumbnail;
+	}
+
+	private function getViewAndPath(File $file) {
+		$view = new View($file->getParent()->getPath());
+		$path = $file->getName();
+
+		return [$view, $path];
+	}
+
+}

lib/private/Preview/ProviderV2.php

@@ -0,0 +1,105 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OC\Preview;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+use OCP\Preview\IProviderV2;
+
+abstract class ProviderV2 implements IProviderV2 {
+	private $options;
+
+	private $tmpFiles = [];
+
+	/**
+	 * Constructor
+	 *
+	 * @param array $options
+	 */
+	public function __construct(array $options = []) {
+		$this->options = $options;
+	}
+
+	/**
+	 * @return string Regex with the mimetypes that are supported by this provider
+	 */
+	abstract public function getMimeType(): string ;
+
+	/**
+	 * Check if a preview can be generated for $path
+	 *
+	 * @param FileInfo $file
+	 * @return bool
+	 */
+	public function isAvailable(FileInfo $file): bool {
+		return true;
+	}
+
+	/**
+	 * get thumbnail for file at path $path
+	 *
+	 * @param File $file
+	 * @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
+	 * @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
+	 * @return null|\OCP\IImage false if no preview was generated
+	 * @since 17.0.0
+	 */
+	abstract public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage;
+
+	/**
+	 * Get a path to either the local file or temporary file
+	 *
+	 * @param File $file
+	 * @param int $maxSize maximum size for temporary files
+	 * @return string
+	 */
+	protected function getLocalFile(File $file, int $maxSize = null): string {
+		$useTempFile = $file->isEncrypted() || !$file->getStorage()->isLocal();
+		if ($useTempFile) {
+			$absPath = \OC::$server->getTempManager()->getTemporaryFile();
+
+			$content = $file->fopen('r');
+
+			if ($maxSize) {
+				$content = stream_get_contents($content, $maxSize);
+			}
+
+			file_put_contents($absPath, $content);
+			$this->tmpFiles[] = $absPath;
+			return $absPath;
+		} else {
+			return $file->getStorage()->getLocalFile($file->getInternalPath());
+		}
+	}
+
+	/**
+	 * Clean any generated temporary files
+	 */
+	protected function cleanTmpFiles() {
+		foreach ($this->tmpFiles as $tmpFile) {
+			unlink($tmpFile);
+		}
+
+		$this->tmpFiles = [];
+	}
+}

lib/private/Preview/SVG.php

@@ -24,32 +24,34 @@
  */
 namespace OC\Preview;
 
+use OCP\IImage;
 use OCP\ILogger;
+use OCP\Files\File;
 
-class SVG extends Provider {
+class SVG extends ProviderV2 {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/svg\+xml/';
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
 		try {
 			$svg = new \Imagick();
 			$svg->setBackgroundColor(new \ImagickPixel('transparent'));
 
-			$content = stream_get_contents($fileview->fopen($path, 'r'));
+			$content = stream_get_contents($file->fopen('r'));
 			if (substr($content, 0, 5) !== '<?xml') {
 				$content = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>' . $content;
 			}
 
 			// Do not parse SVG files with references
 			if (stripos($content, 'xlink:href') !== false) {
-				return false;
+				return null;
 			}
 
 			$svg->readImageBlob($content);
@@ -59,7 +61,7 @@ class SVG extends Provider {
 				'level' => ILogger::ERROR,
 				'app' => 'core',
 			]);
-			return false;
+			return null;
 		}
 
 		//new image object
@@ -71,6 +73,6 @@ class SVG extends Provider {
 
 			return $image;
 		}
-		return false;
+		return null;
 	}
 }

lib/private/Preview/StarOffice.php

@@ -26,7 +26,7 @@ class StarOffice extends Office {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/application\/vnd.sun.xml.*/';
 	}
 }

lib/private/Preview/TIFF.php

@@ -28,7 +28,7 @@ class TIFF extends Bitmap {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/tiff/';
 	}
 }

lib/private/Preview/TXT.php

@@ -26,36 +26,40 @@
  */
 namespace OC\Preview;
 
-class TXT extends Provider {
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+
+class TXT extends ProviderV2 {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/text\/plain/';
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function isAvailable(\OCP\Files\FileInfo $file) {
+	public function isAvailable(FileInfo $file): bool {
 		return $file->getSize() > 0;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getThumbnail($path, $maxX, $maxY, $scalingup, $fileview) {
-		$content = $fileview->fopen($path, 'r');
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage {
+		$content = $file->fopen('r');
 
 		if ($content === false) {
-			return false;
+			return null;
 		}
 
 		$content = stream_get_contents($content,3000);
 
 		//don't create previews of empty text files
 		if(trim($content) === '') {
-			return false;
+			return null;
 		}
 
 		$lines = preg_split("/\r\n|\n|\r/", $content);
@@ -95,6 +99,6 @@ class TXT extends Provider {
 		$imageObject = new \OC_Image();
 		$imageObject->setResource($image);
 
-		return $imageObject->valid() ? $imageObject : false;
+		return $imageObject->valid() ? $imageObject : null;
 	}
 }

lib/private/Preview/XBitmap.php

@@ -26,7 +26,7 @@ class XBitmap extends Image {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getMimeType() {
+	public function getMimeType(): string {
 		return '/image\/x-xbitmap/';
 	}
 }

lib/private/PreviewManager.php

@@ -97,7 +97,7 @@ class PreviewManager implements IPreview {
 	 * In order to improve lazy loading a closure can be registered which will be
 	 * called in case preview providers are actually requested
 	 *
-	 * $callable has to return an instance of \OCP\Preview\IProvider
+	 * $callable has to return an instance of \OCP\Preview\IProvider or \OCP\Preview\IProviderV2
 	 *
 	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
 	 * @param \Closure $callable

lib/public/Preview/IProvider.php

@@ -27,6 +27,7 @@ namespace OCP\Preview;
  *
  * @package OCP\Preview
  * @since 8.1.0
+ * @deprecated 17.0.0 use IProviderV2 instead
  */
 interface IProvider {
 	/**

lib/public/Preview/IProviderV2.php

@@ -0,0 +1,57 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\Preview;
+
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\IImage;
+
+/**
+ * @since 17.0.0
+ */
+interface IProviderV2 {
+	/**
+	 * @return string Regex with the mimetypes that are supported by this provider
+	 * @since 17.0.0
+	 */
+	public function getMimeType(): string;
+
+	/**
+	 * Check if a preview can be generated for $path
+	 *
+	 * @param FileInfo $file
+	 * @return bool
+	 * @since 17.0.0
+	 */
+	public function isAvailable(FileInfo $file): bool;
+
+	/**
+	 * get thumbnail for file at path $path
+	 *
+	 * @param File $file
+	 * @param int $maxX The maximum X size of the thumbnail. It can be smaller depending on the shape of the image
+	 * @param int $maxY The maximum Y size of the thumbnail. It can be smaller depending on the shape of the image
+	 * @return null|\OCP\IImage null if no preview was generated
+	 * @since 17.0.0
+	 */
+	public function getThumbnail(File $file, int $maxX, int $maxY): ?IImage;
+}

tests/lib/Preview/GeneratorTest.php

@@ -33,6 +33,7 @@ use OCP\IConfig;
 use OCP\IImage;
 use OCP\IPreview;
 use OCP\Preview\IProvider;
+use OCP\Preview\IProviderV2;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
 
@@ -149,13 +150,13 @@ class GeneratorTest extends \Test\TestCase {
 				return $defult;
 			}));
 
-		$invalidProvider = $this->createMock(IProvider::class);
+		$invalidProvider = $this->createMock(IProviderV2::class);
 		$invalidProvider->method('isAvailable')
 			->willReturn(true);
-		$unavailableProvider = $this->createMock(IProvider::class);
+		$unavailableProvider = $this->createMock(IProviderV2::class);
 		$unavailableProvider->method('isAvailable')
 			->willReturn(false);
-		$validProvider = $this->createMock(IProvider::class);
+		$validProvider = $this->createMock(IProviderV2::class);
 		$validProvider->method('isAvailable')
 			->with($file)
 			->willReturn(true);

tests/lib/Preview/Provider.php

@@ -21,6 +21,8 @@
 
 namespace Test\Preview;
 
+use OC\Files\Node\File;
+
 abstract class Provider extends \Test\TestCase {
 
 	/** @var string */
@@ -136,7 +138,8 @@ abstract class Provider extends \Test\TestCase {
 	 * @return bool|\OCP\IImage
 	 */
 	private function getPreview($provider) {
-		$preview = $provider->getThumbnail($this->imgPath, $this->maxWidth, $this->maxHeight, $this->scalingUp, $this->rootView);
+		$file = new File(\OC::$server->getRootFolder(), $this->rootView, $this->imgPath);
+		$preview = $provider->getThumbnail($file, $this->maxWidth, $this->maxHeight, $this->scalingUp);
 
 		$this->assertNotEquals(false, $preview);
 		$this->assertEquals(true, $preview->valid());