Generator::getExtention() - Code Metrics - Inspection of "Merge pull request #10712 from nextcloud/fix/noid/..." - nextcloud/server - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( c260e4...4b92a0 )

by Blizzz

created 2018-08-20 11:21 UTC

Generator::getExtention() A

↳ Parent: Generator

Complexity

Conditions	4
Paths	4

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	4
nc	4
nop	1
dl	0
loc	12
rs	9.8666
c	0
b	0
f	0

<?php
/**
 * @copyright Copyright (c) 2016, Roeland Jago Douma <[email protected]>
 *
 * @author Morris Jobke <[email protected]>
 * @author Robin Appelman <[email protected]>
 * @author Roeland Jago Douma <[email protected]>
 *
 * @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\IAppData;
use OCP\Files\NotFoundException;
use OCP\Files\NotPermittedException;
use OCP\Files\SimpleFS\ISimpleFile;
use OCP\Files\SimpleFS\ISimpleFolder;
use OCP\IConfig;
use OCP\IImage;
use OCP\IPreview;
use OCP\Preview\IProvider;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\GenericEvent;

class Generator {

	/** @var IPreview */
	private $previewManager;
	/** @var IConfig */
	private $config;
	/** @var IAppData */
	private $appData;
	/** @var GeneratorHelper */
	private $helper;
	/** @var EventDispatcherInterface */
	private $eventDispatcher;

	/**
	 * @param IConfig $config
	 * @param IPreview $previewManager
	 * @param IAppData $appData
	 * @param GeneratorHelper $helper
	 * @param EventDispatcherInterface $eventDispatcher
	 */
	public function __construct(
		IConfig $config,
		IPreview $previewManager,
		IAppData $appData,
		GeneratorHelper $helper,
		EventDispatcherInterface $eventDispatcher
	) {
		$this->config = $config;
		$this->previewManager = $previewManager;
		$this->appData = $appData;
		$this->helper = $helper;
		$this->eventDispatcher = $eventDispatcher;
	}

	/**
	 * Returns a preview of a file
	 *
	 * The cache is searched first and if nothing usable was found then a preview is
	 * generated by one of the providers
	 *
	 * @param File $file
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param string $mode
	 * @param string $mimeType
	 * @return ISimpleFile
	 * @throws NotFoundException
	 * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
	 */
	public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
		//Make sure that we can read the file
		if (!$file->isReadable()) {
			throw new NotFoundException('Cannot read file');
		}


		$this->eventDispatcher->dispatch(
			IPreview::EVENT,
			new GenericEvent($file,[
				'width' => $width,
				'height' => $height,
				'crop' => $crop,
				'mode' => $mode
			])
		);

		if ($mimeType === null) {
			$mimeType = $file->getMimeType();
		}
		if (!$this->previewManager->isMimeSupported($mimeType)) {
			throw new NotFoundException();
		}

		$previewFolder = $this->getPreviewFolder($file);

		// Get the max preview and infer the max preview sizes from that
		$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
		if ($maxPreview->getSize() === 0) {
			$maxPreview->delete();
			throw new NotFoundException('Max preview size 0, invalid!');
		}

		list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);

		// If both width and heigth are -1 we just want the max preview
		if ($width === -1 && $height === -1) {
			$width = $maxWidth;
			$height = $maxHeight;
		}

		// Calculate the preview size
		list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);

		// No need to generate a preview that is just the max preview
		if ($width === $maxWidth && $height === $maxHeight) {
			return $maxPreview;
		}

		// Try to get a cached preview. Else generate (and store) one
		try {
			try {
				$preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType());
			} catch (NotFoundException $e) {
				$preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight);
			}
		} catch (\InvalidArgumentException $e) {
			throw new NotFoundException();
		}

		if ($preview->getSize() === 0) {
			$preview->delete();
			throw new NotFoundException('Cached preview size 0, invalid!');
		}

		return $preview;
	}

	/**
	 * @param ISimpleFolder $previewFolder
	 * @param File $file
	 * @param string $mimeType
	 * @return ISimpleFile
	 * @throws NotFoundException
	 */
	private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType) {
		$nodes = $previewFolder->getDirectoryListing();

		foreach ($nodes as $node) {
			if (strpos($node->getName(), 'max')) {
				return $node;
			}
		}

		$previewProviders = $this->previewManager->getProviders();
		foreach ($previewProviders as $supportedMimeType => $providers) {
			if (!preg_match($supportedMimeType, $mimeType)) {
				continue;
			}

			foreach ($providers as $provider) {
				$provider = $this->helper->getProvider($provider);
				if (!($provider instanceof IProvider)) {
					continue;
				}

				if (!$provider->isAvailable($file)) {
					continue;
				}

				$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
				$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);

				$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);

				if (!($preview instanceof IImage)) {
					continue;
				}

				// Try to get the extention.
				try {
					$ext = $this->getExtention($preview->dataMimeType());
				} catch (\InvalidArgumentException $e) {
					// Just continue to the next iteration if this preview doesn't have a valid mimetype
					continue;
				}

				$path = (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
				try {
					$file = $previewFolder->newFile($path);
					$file->putContent($preview->data());
				} catch (NotPermittedException $e) {
					throw new NotFoundException();
				}

				return $file;
			}
		}

		throw new NotFoundException();
	}

	/**
	 * @param ISimpleFile $file
	 * @return int[]
	 */
	private function getPreviewSize(ISimpleFile $file) {
		$size = explode('-', $file->getName());
		return [(int)$size[0], (int)$size[1]];
	}

	/**
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param string $mimeType
	 * @return string
	 */
	private function generatePath($width, $height, $crop, $mimeType) {
		$path = (string)$width . '-' . (string)$height;
		if ($crop) {
			$path .= '-crop';
		}

		$ext = $this->getExtention($mimeType);
		$path .= '.' . $ext;
		return $path;
	}



	/**
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param string $mode
	 * @param int $maxWidth
	 * @param int $maxHeight
	 * @return int[]
	 */
	private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {

		/*
		 * If we are not cropping we have to make sure the requested image
		 * respects the aspect ratio of the original.
		 */
		if (!$crop) {
			$ratio = $maxHeight / $maxWidth;

			if ($width === -1) {
				$width = $height / $ratio;
			}
			if ($height === -1) {
				$height = $width * $ratio;
			}

			$ratioH = $height / $maxHeight;
			$ratioW = $width / $maxWidth;

			/*
			 * Fill means that the $height and $width are the max
			 * Cover means min.
			 */
			if ($mode === IPreview::MODE_FILL) {
				if ($ratioH > $ratioW) {
					$height = $width * $ratio;
				} else {
					$width = $height / $ratio;
				}
			} else if ($mode === IPreview::MODE_COVER) {
				if ($ratioH > $ratioW) {
					$width = $height / $ratio;
				} else {
					$height = $width * $ratio;
				}
			}
		}

		if ($height !== $maxHeight && $width !== $maxWidth) {
			/*
			 * Scale to the nearest power of two
			 */
			$pow2height = 2 ** ceil(log($height) / log(2));
			$pow2width = 2 ** ceil(log($width) / log(2));

			$ratioH = $height / $pow2height;
			$ratioW = $width / $pow2width;

			if ($ratioH < $ratioW) {
				$width = $pow2width;
				$height /= $ratioW;
			} else {
				$height = $pow2height;
				$width /= $ratioH;
			}
		}

		/*
 		 * Make sure the requested height and width fall within the max
 		 * of the preview.
 		 */
		if ($height > $maxHeight) {
			$ratio = $height / $maxHeight;
			$height = $maxHeight;
			$width /= $ratio;
		}
		if ($width > $maxWidth) {
			$ratio = $width / $maxWidth;
			$width = $maxWidth;
			$height /= $ratio;
		}

		return [(int)round($width), (int)round($height)];
	}

	/**
	 * @param ISimpleFolder $previewFolder
	 * @param ISimpleFile $maxPreview
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param int $maxWidth
	 * @param int $maxHeight
	 * @return ISimpleFile
	 * @throws NotFoundException
	 * @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
	 */
	private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight) {
		$preview = $this->helper->getImage($maxPreview);

		if (!$preview->valid()) {
			throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
		}

		if ($crop) {
			if ($height !== $preview->height() && $width !== $preview->width()) {
				//Resize
				$widthR = $preview->width() / $width;
				$heightR = $preview->height() / $height;

				if ($widthR > $heightR) {
					$scaleH = $height;
					$scaleW = $maxWidth / $heightR;
				} else {
					$scaleH = $maxHeight / $widthR;
					$scaleW = $width;
				}
				$preview->preciseResize((int)round($scaleW), (int)round($scaleH));
			}
			$cropX = (int)floor(abs($width - $preview->width()) * 0.5);
			$cropY = 0;
			$preview->crop($cropX, $cropY, $width, $height);
		} else {
			$preview->resize(max($width, $height));
		}


		$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType());
		try {
			$file = $previewFolder->newFile($path);
			$file->putContent($preview->data());
		} catch (NotPermittedException $e) {
			throw new NotFoundException();
		}

		return $file;
	}

	/**
	 * @param ISimpleFolder $previewFolder
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param string $mimeType
	 * @return ISimpleFile
	 *
	 * @throws NotFoundException
	 */
	private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType) {
		$path = $this->generatePath($width, $height, $crop, $mimeType);

		return $previewFolder->getFile($path);
	}

	/**
	 * Get the specific preview folder for this file
	 *
	 * @param File $file
	 * @return ISimpleFolder
	 */
	private function getPreviewFolder(File $file) {
		try {
			$folder = $this->appData->getFolder($file->getId());
		} catch (NotFoundException $e) {
			$folder = $this->appData->newFolder($file->getId());
		}

		return $folder;
	}

	/**
	 * @param string $mimeType
	 * @return null|string
	 * @throws \InvalidArgumentException
	 */
	private function getExtention($mimeType) {
		switch ($mimeType) {
			case 'image/png':
				return 'png';
			case 'image/jpeg':
				return 'jpg';
			case 'image/gif':
				return 'gif';
			default:
				throw new \InvalidArgumentException('Not a valid mimetype');
		}
	}
}


1			<?php
2			/**
3			* @copyright Copyright (c) 2016, Roeland Jago Douma <[email protected]>
4			*
5			* @author Morris Jobke <[email protected]>
6			* @author Robin Appelman <[email protected]>
7			* @author Roeland Jago Douma <[email protected]>
8			*
9			* @license GNU AGPL version 3 or any later version
10			*
11			* This program is free software: you can redistribute it and/or modify
12			* it under the terms of the GNU Affero General Public License as
13			* published by the Free Software Foundation, either version 3 of the
14			* License, or (at your option) any later version.
15			*
16			* This program is distributed in the hope that it will be useful,
17			* but WITHOUT ANY WARRANTY; without even the implied warranty of
18			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19			* GNU Affero General Public License for more details.
20			*
21			* You should have received a copy of the GNU Affero General Public License
22			* along with this program. If not, see <http://www.gnu.org/licenses/>.
23			*
24			*/
25
26			namespace OC\Preview;
27
28			use OCP\Files\File;
29			use OCP\Files\IAppData;
30			use OCP\Files\NotFoundException;
31			use OCP\Files\NotPermittedException;
32			use OCP\Files\SimpleFS\ISimpleFile;
33			use OCP\Files\SimpleFS\ISimpleFolder;
34			use OCP\IConfig;
35			use OCP\IImage;
36			use OCP\IPreview;
37			use OCP\Preview\IProvider;
38			use Symfony\Component\EventDispatcher\EventDispatcherInterface;
39			use Symfony\Component\EventDispatcher\GenericEvent;
40
41			class Generator {
42
43			/** @var IPreview */
44			private $previewManager;
45			/** @var IConfig */
46			private $config;
47			/** @var IAppData */
48			private $appData;
49			/** @var GeneratorHelper */
50			private $helper;
51			/** @var EventDispatcherInterface */
52			private $eventDispatcher;
53
54			/**
55			* @param IConfig $config
56			* @param IPreview $previewManager
57			* @param IAppData $appData
58			* @param GeneratorHelper $helper
59			* @param EventDispatcherInterface $eventDispatcher
60			*/
61			public function __construct(
62			IConfig $config,
63			IPreview $previewManager,
64			IAppData $appData,
65			GeneratorHelper $helper,
66			EventDispatcherInterface $eventDispatcher
67			) {
68			$this->config = $config;
69			$this->previewManager = $previewManager;
70			$this->appData = $appData;
71			$this->helper = $helper;
72			$this->eventDispatcher = $eventDispatcher;
73			}
74
75			/**
76			* Returns a preview of a file
77			*
78			* The cache is searched first and if nothing usable was found then a preview is
79			* generated by one of the providers
80			*
81			* @param File $file
82			* @param int $width
83			* @param int $height
84			* @param bool $crop
85			* @param string $mode
86			* @param string $mimeType
87			* @return ISimpleFile
88			* @throws NotFoundException
89			* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
90			*/
91			public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
92			//Make sure that we can read the file
93			if (!$file->isReadable()) {
94			throw new NotFoundException('Cannot read file');
95			}
96
97
98			$this->eventDispatcher->dispatch(
99			IPreview::EVENT,
100			new GenericEvent($file,[
101			'width' => $width,
102			'height' => $height,
103			'crop' => $crop,
104			'mode' => $mode
105			])
106			);
107
108			if ($mimeType === null) {
109			$mimeType = $file->getMimeType();
110			}
111			if (!$this->previewManager->isMimeSupported($mimeType)) {
112			throw new NotFoundException();
113			}
114
115			$previewFolder = $this->getPreviewFolder($file);
116
117			// Get the max preview and infer the max preview sizes from that
118			$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType);
119			if ($maxPreview->getSize() === 0) {
120			$maxPreview->delete();
121			throw new NotFoundException('Max preview size 0, invalid!');
122			}
123
124			list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview);
125
126			// If both width and heigth are -1 we just want the max preview
127			if ($width === -1 && $height === -1) {
128			$width = $maxWidth;
129			$height = $maxHeight;
130			}
131
132			// Calculate the preview size
133			list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
134
135			// No need to generate a preview that is just the max preview
136			if ($width === $maxWidth && $height === $maxHeight) {
137			return $maxPreview;
138			}
139
140			// Try to get a cached preview. Else generate (and store) one
141			try {
142			try {
143			$preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType());
144			} catch (NotFoundException $e) {
145			$preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight);
146			}
147			} catch (\InvalidArgumentException $e) {
148			throw new NotFoundException();
149			}
150
151			if ($preview->getSize() === 0) {
152			$preview->delete();
153			throw new NotFoundException('Cached preview size 0, invalid!');
154			}
155
156			return $preview;
157			}
158
159			/**
160			* @param ISimpleFolder $previewFolder
161			* @param File $file
162			* @param string $mimeType
163			* @return ISimpleFile
164			* @throws NotFoundException
165			*/
166			private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType) {
167			$nodes = $previewFolder->getDirectoryListing();
168
169			foreach ($nodes as $node) {
170			if (strpos($node->getName(), 'max')) {
171			return $node;
172			}
173			}
174
175			$previewProviders = $this->previewManager->getProviders();
176			foreach ($previewProviders as $supportedMimeType => $providers) {
177			if (!preg_match($supportedMimeType, $mimeType)) {
178			continue;
179			}
180
181			foreach ($providers as $provider) {
182			$provider = $this->helper->getProvider($provider);
183			if (!($provider instanceof IProvider)) {
184			continue;
185			}
186
187			if (!$provider->isAvailable($file)) {
188			continue;
189			}
190
191			$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
192			$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);
193
194			$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
195
196			if (!($preview instanceof IImage)) {
197			continue;
198			}
199
200			// Try to get the extention.
201			try {
202			$ext = $this->getExtention($preview->dataMimeType());
203			} catch (\InvalidArgumentException $e) {
204			// Just continue to the next iteration if this preview doesn't have a valid mimetype
205			continue;
206			}
207
208			$path = (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
209			try {
210			$file = $previewFolder->newFile($path);
211			$file->putContent($preview->data());
212			} catch (NotPermittedException $e) {
213			throw new NotFoundException();
214			}
215
216			return $file;
217			}
218			}
219
220			throw new NotFoundException();
221			}
222
223			/**
224			* @param ISimpleFile $file
225			* @return int[]
226			*/
227			private function getPreviewSize(ISimpleFile $file) {
228			$size = explode('-', $file->getName());
229			return [(int)$size[0], (int)$size[1]];
230			}
231
232			/**
233			* @param int $width
234			* @param int $height
235			* @param bool $crop
236			* @param string $mimeType
237			* @return string
238			*/
239			private function generatePath($width, $height, $crop, $mimeType) {
240			$path = (string)$width . '-' . (string)$height;
241			if ($crop) {
242			$path .= '-crop';
243			}
244
245			$ext = $this->getExtention($mimeType);
246			$path .= '.' . $ext;
247			return $path;
248			}
249
250
251
252			/**
253			* @param int $width
254			* @param int $height
255			* @param bool $crop
256			* @param string $mode
257			* @param int $maxWidth
258			* @param int $maxHeight
259			* @return int[]
260			*/
261			private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {
262
263			/*
264			* If we are not cropping we have to make sure the requested image
265			* respects the aspect ratio of the original.
266			*/
267			if (!$crop) {
268			$ratio = $maxHeight / $maxWidth;
269
270			if ($width === -1) {
271			$width = $height / $ratio;
272			}
273			if ($height === -1) {
274			$height = $width * $ratio;
275			}
276
277			$ratioH = $height / $maxHeight;
278			$ratioW = $width / $maxWidth;
279
280			/*
281			* Fill means that the $height and $width are the max
282			* Cover means min.
283			*/
284			if ($mode === IPreview::MODE_FILL) {
285			if ($ratioH > $ratioW) {
286			$height = $width * $ratio;
287			} else {
288			$width = $height / $ratio;
289			}
290			} else if ($mode === IPreview::MODE_COVER) {
291			if ($ratioH > $ratioW) {
292			$width = $height / $ratio;
293			} else {
294			$height = $width * $ratio;
295			}
296			}
297			}
298
299			if ($height !== $maxHeight && $width !== $maxWidth) {
300			/*
301			* Scale to the nearest power of two
302			*/
303			$pow2height = 2 ** ceil(log($height) / log(2));
304			$pow2width = 2 ** ceil(log($width) / log(2));
305
306			$ratioH = $height / $pow2height;
307			$ratioW = $width / $pow2width;
308
309			if ($ratioH < $ratioW) {
310			$width = $pow2width;
311			$height /= $ratioW;
312			} else {
313			$height = $pow2height;
314			$width /= $ratioH;
315			}
316			}
317
318			/*
319			* Make sure the requested height and width fall within the max
320			* of the preview.
321			*/
322			if ($height > $maxHeight) {
323			$ratio = $height / $maxHeight;
324			$height = $maxHeight;
325			$width /= $ratio;
326			}
327			if ($width > $maxWidth) {
328			$ratio = $width / $maxWidth;
329			$width = $maxWidth;
330			$height /= $ratio;
331			}
332
333			return [(int)round($width), (int)round($height)];
334			}
335
336			/**
337			* @param ISimpleFolder $previewFolder
338			* @param ISimpleFile $maxPreview
339			* @param int $width
340			* @param int $height
341			* @param bool $crop
342			* @param int $maxWidth
343			* @param int $maxHeight
344			* @return ISimpleFile
345			* @throws NotFoundException
346			* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
347			*/
348			private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight) {
349			$preview = $this->helper->getImage($maxPreview);
350
351			if (!$preview->valid()) {
352			throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
353			}
354
355			if ($crop) {
356			if ($height !== $preview->height() && $width !== $preview->width()) {
357			//Resize
358			$widthR = $preview->width() / $width;
359			$heightR = $preview->height() / $height;
360
361			if ($widthR > $heightR) {
362			$scaleH = $height;
363			$scaleW = $maxWidth / $heightR;
364			} else {
365			$scaleH = $maxHeight / $widthR;
366			$scaleW = $width;
367			}
368			$preview->preciseResize((int)round($scaleW), (int)round($scaleH));
369			}
370			$cropX = (int)floor(abs($width - $preview->width()) * 0.5);
371			$cropY = 0;
372			$preview->crop($cropX, $cropY, $width, $height);
373			} else {
374			$preview->resize(max($width, $height));
375			}
376
377
378			$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType());
379			try {
380			$file = $previewFolder->newFile($path);
381			$file->putContent($preview->data());
382			} catch (NotPermittedException $e) {
383			throw new NotFoundException();
384			}
385
386			return $file;
387			}
388
389			/**
390			* @param ISimpleFolder $previewFolder
391			* @param int $width
392			* @param int $height
393			* @param bool $crop
394			* @param string $mimeType
395			* @return ISimpleFile
396			*
397			* @throws NotFoundException
398			*/
399			private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType) {
400			$path = $this->generatePath($width, $height, $crop, $mimeType);
401
402			return $previewFolder->getFile($path);
403			}
404
405			/**
406			* Get the specific preview folder for this file
407			*
408			* @param File $file
409			* @return ISimpleFolder
410			*/
411			private function getPreviewFolder(File $file) {
412			try {
413			$folder = $this->appData->getFolder($file->getId());
414			} catch (NotFoundException $e) {
415			$folder = $this->appData->newFolder($file->getId());
416			}
417
418			return $folder;
419			}
420
421			/**
422			* @param string $mimeType
423			* @return null\|string
424			* @throws \InvalidArgumentException
425			*/
426			private function getExtention($mimeType) {
427			switch ($mimeType) {
428			case 'image/png':
429			return 'png';
430			case 'image/jpeg':
431			return 'jpg';
432			case 'image/gif':
433			return 'gif';
434			default:
435			throw new \InvalidArgumentException('Not a valid mimetype');
436			}
437			}
438			}
439

nextcloud / server

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