Generator::generatePreview() - Code Metrics - Inspection of "Merge pull request #15867 from nextcloud/preview-v..." - nextcloud/server - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 5cef89...027486 )

by Roeland

created 2019-07-09 09:07 UTC

Generator::generatePreview() B

↳ Parent: Generator

Complexity

Conditions	7
Paths	13

Size

Total Lines	39
Code Lines	26

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	7
eloc	26
nc	13
nop	8
dl	0
loc	39
rs	8.5706
c	0
b	0
f	0

How to fix Many Parameters

<?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 OC\Preview\GeneratorHelper;
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 OCP\Preview\IVersionedPreviewFile;
use OCP\Preview\IProviderV2;
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);

		$previewVersion = '';
		if ($file instanceof IVersionedPreviewFile) {
			$previewVersion = $file->getPreviewVersion() . '-';
		}

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

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

		// 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(), $previewVersion);
			} catch (NotFoundException $e) {
				$preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $previewVersion);
			}
		} 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
	 * @param string $prefix
	 * @return ISimpleFile
	 * @throws NotFoundException
	 */
	private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType, $prefix) {
		$nodes = $previewFolder->getDirectoryListing();

		foreach ($nodes as $node) {
			$name = $node->getName();
			if (($prefix === '' || strpos($name, $prefix) === 0) && strpos($name, 'max')) {
				return $node;
			}
		}

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

			foreach ($providers as $providerClosure) {
				$provider = $this->helper->getProvider($providerClosure);
				if (!($provider instanceof IProviderV2)) {
					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 = $prefix . (string)$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
	 * @param string $prefix
	 * @return int[]
	 */
	private function getPreviewSize(ISimpleFile $file, string $prefix = '') {
		$size = explode('-', substr($file->getName(), strlen($prefix)));
		return [(int)$size[0], (int)$size[1]];
	}

	/**
	 * @param int $width
	 * @param int $height
	 * @param bool $crop
	 * @param string $mimeType
	 * @param string $prefix
	 * @return string
	 */
	private function generatePath($width, $height, $crop, $mimeType, $prefix) {
		$path = $prefix . (string)$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 four
			 */
			$pow4height = 4 ** ceil(log($height) / log(4));
			$pow4width = 4 ** ceil(log($width) / log(4));

			// Minimum size is 64
			$pow4height = max($pow4height, 64);
			$pow4width = max($pow4width, 64);

			$ratioH = $height / $pow4height;
			$ratioW = $width / $pow4width;

			if ($ratioH < $ratioW) {
				$width = $pow4width;
				$height /= $ratioW;
			} else {
				$height = $pow4height;
				$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
	 * @param string $prefix
	 * @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, $prefix) {
		$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(), $prefix);
		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
	 * @param string $prefix
	 * @return ISimpleFile
	 *
	 * @throws NotFoundException
	 */
	private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType, $prefix) {
		$path = $this->generatePath($width, $height, $crop, $mimeType, $prefix);

		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 OC\Preview\GeneratorHelper;
29			use OCP\Files\File;
30			use OCP\Files\IAppData;
31			use OCP\Files\NotFoundException;
32			use OCP\Files\NotPermittedException;
33			use OCP\Files\SimpleFS\ISimpleFile;
34			use OCP\Files\SimpleFS\ISimpleFolder;
35			use OCP\IConfig;
36			use OCP\IImage;
37			use OCP\IPreview;
38			use OCP\Preview\IProvider;
39			use OCP\Preview\IVersionedPreviewFile;
40			use OCP\Preview\IProviderV2;
41			use Symfony\Component\EventDispatcher\EventDispatcherInterface;
42			use Symfony\Component\EventDispatcher\GenericEvent;
43
44			class Generator {
45
46			/** @var IPreview */
47			private $previewManager;
48			/** @var IConfig */
49			private $config;
50			/** @var IAppData */
51			private $appData;
52			/** @var GeneratorHelper */
53			private $helper;
54			/** @var EventDispatcherInterface */
55			private $eventDispatcher;
56
57			/**
58			* @param IConfig $config
59			* @param IPreview $previewManager
60			* @param IAppData $appData
61			* @param GeneratorHelper $helper
62			* @param EventDispatcherInterface $eventDispatcher
63			*/
64			public function __construct(
65			IConfig $config,
66			IPreview $previewManager,
67			IAppData $appData,
68			GeneratorHelper $helper,
69			EventDispatcherInterface $eventDispatcher
70			) {
71			$this->config = $config;
72			$this->previewManager = $previewManager;
73			$this->appData = $appData;
74			$this->helper = $helper;
75			$this->eventDispatcher = $eventDispatcher;
76			}
77
78			/**
79			* Returns a preview of a file
80			*
81			* The cache is searched first and if nothing usable was found then a preview is
82			* generated by one of the providers
83			*
84			* @param File $file
85			* @param int $width
86			* @param int $height
87			* @param bool $crop
88			* @param string $mode
89			* @param string $mimeType
90			* @return ISimpleFile
91			* @throws NotFoundException
92			* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
93			*/
94			public function getPreview(File $file, $width = -1, $height = -1, $crop = false, $mode = IPreview::MODE_FILL, $mimeType = null) {
95			//Make sure that we can read the file
96			if (!$file->isReadable()) {
97			throw new NotFoundException('Cannot read file');
98			}
99
100
101			$this->eventDispatcher->dispatch(
102			IPreview::EVENT,
103			new GenericEvent($file, [
104			'width' => $width,
105			'height' => $height,
106			'crop' => $crop,
107			'mode' => $mode
108			])
109			);
110
111			if ($mimeType === null) {
112			$mimeType = $file->getMimeType();
113			}
114			if (!$this->previewManager->isMimeSupported($mimeType)) {
115			throw new NotFoundException();
116			}
117
118			$previewFolder = $this->getPreviewFolder($file);
119
120			$previewVersion = '';
121			if ($file instanceof IVersionedPreviewFile) {
122			$previewVersion = $file->getPreviewVersion() . '-';
123			}
124
125			// Get the max preview and infer the max preview sizes from that
126			$maxPreview = $this->getMaxPreview($previewFolder, $file, $mimeType, $previewVersion);
127			if ($maxPreview->getSize() === 0) {
128			$maxPreview->delete();
129			throw new NotFoundException('Max preview size 0, invalid!');
130			}
131
132			list($maxWidth, $maxHeight) = $this->getPreviewSize($maxPreview, $previewVersion);
133
134			// If both width and heigth are -1 we just want the max preview
135			if ($width === -1 && $height === -1) {
136			$width = $maxWidth;
137			$height = $maxHeight;
138			}
139
140			// Calculate the preview size
141			list($width, $height) = $this->calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight);
142
143			// No need to generate a preview that is just the max preview
144			if ($width === $maxWidth && $height === $maxHeight) {
145			return $maxPreview;
146			}
147
148			// Try to get a cached preview. Else generate (and store) one
149			try {
150			try {
151			$preview = $this->getCachedPreview($previewFolder, $width, $height, $crop, $maxPreview->getMimeType(), $previewVersion);
152			} catch (NotFoundException $e) {
153			$preview = $this->generatePreview($previewFolder, $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $previewVersion);
154			}
155			} catch (\InvalidArgumentException $e) {
156			throw new NotFoundException();
157			}
158
159			if ($preview->getSize() === 0) {
160			$preview->delete();
161			throw new NotFoundException('Cached preview size 0, invalid!');
162			}
163
164			return $preview;
165			}
166
167			/**
168			* @param ISimpleFolder $previewFolder
169			* @param File $file
170			* @param string $mimeType
171			* @param string $prefix
172			* @return ISimpleFile
173			* @throws NotFoundException
174			*/
175			private function getMaxPreview(ISimpleFolder $previewFolder, File $file, $mimeType, $prefix) {
176			$nodes = $previewFolder->getDirectoryListing();
177
178			foreach ($nodes as $node) {
179			$name = $node->getName();
180			if (($prefix === '' \|\| strpos($name, $prefix) === 0) && strpos($name, 'max')) {
181			return $node;
182			}
183			}
184
185			$previewProviders = $this->previewManager->getProviders();
186			foreach ($previewProviders as $supportedMimeType => $providers) {
187			if (!preg_match($supportedMimeType, $mimeType)) {
188			continue;
189			}
190
191			foreach ($providers as $providerClosure) {
192			$provider = $this->helper->getProvider($providerClosure);
193			if (!($provider instanceof IProviderV2)) {
194			continue;
195			}
196
197			if (!$provider->isAvailable($file)) {
198			continue;
199			}
200
201			$maxWidth = (int)$this->config->getSystemValue('preview_max_x', 4096);
202			$maxHeight = (int)$this->config->getSystemValue('preview_max_y', 4096);
203
204			$preview = $this->helper->getThumbnail($provider, $file, $maxWidth, $maxHeight);
205
206			if (!($preview instanceof IImage)) {
207			continue;
208			}
209
210			// Try to get the extention.
211			try {
212			$ext = $this->getExtention($preview->dataMimeType());
213			} catch (\InvalidArgumentException $e) {
214			// Just continue to the next iteration if this preview doesn't have a valid mimetype
215			continue;
216			}
217
218			$path = $prefix . (string)$preview->width() . '-' . (string)$preview->height() . '-max.' . $ext;
219			try {
220			$file = $previewFolder->newFile($path);
221			$file->putContent($preview->data());
222			} catch (NotPermittedException $e) {
223			throw new NotFoundException();
224			}
225
226			return $file;
227			}
228			}
229
230			throw new NotFoundException();
231			}
232
233			/**
234			* @param ISimpleFile $file
235			* @param string $prefix
236			* @return int[]
237			*/
238			private function getPreviewSize(ISimpleFile $file, string $prefix = '') {
239			$size = explode('-', substr($file->getName(), strlen($prefix)));
240			return [(int)$size[0], (int)$size[1]];
241			}
242
243			/**
244			* @param int $width
245			* @param int $height
246			* @param bool $crop
247			* @param string $mimeType
248			* @param string $prefix
249			* @return string
250			*/
251			private function generatePath($width, $height, $crop, $mimeType, $prefix) {
252			$path = $prefix . (string)$width . '-' . (string)$height;
253			if ($crop) {
254			$path .= '-crop';
255			}
256
257			$ext = $this->getExtention($mimeType);
258			$path .= '.' . $ext;
259			return $path;
260			}
261
262
263			/**
264			* @param int $width
265			* @param int $height
266			* @param bool $crop
267			* @param string $mode
268			* @param int $maxWidth
269			* @param int $maxHeight
270			* @return int[]
271			*/
272			private function calculateSize($width, $height, $crop, $mode, $maxWidth, $maxHeight) {
273
274			/*
275			* If we are not cropping we have to make sure the requested image
276			* respects the aspect ratio of the original.
277			*/
278			if (!$crop) {
279			$ratio = $maxHeight / $maxWidth;
280
281			if ($width === -1) {
282			$width = $height / $ratio;
283			}
284			if ($height === -1) {
285			$height = $width * $ratio;
286			}
287
288			$ratioH = $height / $maxHeight;
289			$ratioW = $width / $maxWidth;
290
291			/*
292			* Fill means that the $height and $width are the max
293			* Cover means min.
294			*/
295			if ($mode === IPreview::MODE_FILL) {
296			if ($ratioH > $ratioW) {
297			$height = $width * $ratio;
298			} else {
299			$width = $height / $ratio;
300			}
301			} else if ($mode === IPreview::MODE_COVER) {
302			if ($ratioH > $ratioW) {
303			$width = $height / $ratio;
304			} else {
305			$height = $width * $ratio;
306			}
307			}
308			}
309
310			if ($height !== $maxHeight && $width !== $maxWidth) {
311			/*
312			* Scale to the nearest power of four
313			*/
314			$pow4height = 4 ** ceil(log($height) / log(4));
315			$pow4width = 4 ** ceil(log($width) / log(4));
316
317			// Minimum size is 64
318			$pow4height = max($pow4height, 64);
319			$pow4width = max($pow4width, 64);
320
321			$ratioH = $height / $pow4height;
322			$ratioW = $width / $pow4width;
323
324			if ($ratioH < $ratioW) {
325			$width = $pow4width;
326			$height /= $ratioW;
327			} else {
328			$height = $pow4height;
329			$width /= $ratioH;
330			}
331			}
332
333			/*
334			* Make sure the requested height and width fall within the max
335			* of the preview.
336			*/
337			if ($height > $maxHeight) {
338			$ratio = $height / $maxHeight;
339			$height = $maxHeight;
340			$width /= $ratio;
341			}
342			if ($width > $maxWidth) {
343			$ratio = $width / $maxWidth;
344			$width = $maxWidth;
345			$height /= $ratio;
346			}
347
348			return [(int)round($width), (int)round($height)];
349			}
350
351			/**
352			* @param ISimpleFolder $previewFolder
353			* @param ISimpleFile $maxPreview
354			* @param int $width
355			* @param int $height
356			* @param bool $crop
357			* @param int $maxWidth
358			* @param int $maxHeight
359			* @param string $prefix
360			* @return ISimpleFile
361			* @throws NotFoundException
362			* @throws \InvalidArgumentException if the preview would be invalid (in case the original image is invalid)
363			*/
364			private function generatePreview(ISimpleFolder $previewFolder, ISimpleFile $maxPreview, $width, $height, $crop, $maxWidth, $maxHeight, $prefix) {
365			$preview = $this->helper->getImage($maxPreview);
366
367			if (!$preview->valid()) {
368			throw new \InvalidArgumentException('Failed to generate preview, failed to load image');
369			}
370
371			if ($crop) {
372			if ($height !== $preview->height() && $width !== $preview->width()) {
373			//Resize
374			$widthR = $preview->width() / $width;
375			$heightR = $preview->height() / $height;
376
377			if ($widthR > $heightR) {
378			$scaleH = $height;
379			$scaleW = $maxWidth / $heightR;
380			} else {
381			$scaleH = $maxHeight / $widthR;
382			$scaleW = $width;
383			}
384			$preview->preciseResize((int)round($scaleW), (int)round($scaleH));
385			}
386			$cropX = (int)floor(abs($width - $preview->width()) * 0.5);
387			$cropY = 0;
388			$preview->crop($cropX, $cropY, $width, $height);
389			} else {
390			$preview->resize(max($width, $height));
391			}
392
393
394			$path = $this->generatePath($width, $height, $crop, $preview->dataMimeType(), $prefix);
395			try {
396			$file = $previewFolder->newFile($path);
397			$file->putContent($preview->data());
398			} catch (NotPermittedException $e) {
399			throw new NotFoundException();
400			}
401
402			return $file;
403			}
404
405			/**
406			* @param ISimpleFolder $previewFolder
407			* @param int $width
408			* @param int $height
409			* @param bool $crop
410			* @param string $mimeType
411			* @param string $prefix
412			* @return ISimpleFile
413			*
414			* @throws NotFoundException
415			*/
416			private function getCachedPreview(ISimpleFolder $previewFolder, $width, $height, $crop, $mimeType, $prefix) {
417			$path = $this->generatePath($width, $height, $crop, $mimeType, $prefix);
418
419			return $previewFolder->getFile($path);
420			}
421
422			/**
423			* Get the specific preview folder for this file
424			*
425			* @param File $file
426			* @return ISimpleFolder
427			*/
428			private function getPreviewFolder(File $file) {
429			try {
430			$folder = $this->appData->getFolder($file->getId());
431			} catch (NotFoundException $e) {
432			$folder = $this->appData->newFolder($file->getId());
433			}
434
435			return $folder;
436			}
437
438			/**
439			* @param string $mimeType
440			* @return null\|string
441			* @throws \InvalidArgumentException
442			*/
443			private function getExtention($mimeType) {
444			switch ($mimeType) {
445			case 'image/png':
446			return 'png';
447			case 'image/jpeg':
448			return 'jpg';
449			case 'image/gif':
450			return 'gif';
451			default:
452			throw new \InvalidArgumentException('Not a valid mimetype');
453			}
454			}
455			}
456

nextcloud / server

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Generator::generatePreview() B

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