options/license/PHP-3.0


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

The PHP License, version 3.0 

Copyright (c) 1999 - 2006 The PHP Group. All rights reserved. 

Redistribution and use in source and binary forms, with or without modification, is permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 

3. The name "PHP" must not be used to endorse or promote products derived from this software without prior written permission. For written permission, please contact group@php.net. 

4. Products derived from this software may not be called "PHP", nor may "PHP" appear in their name, without prior written permission from group@php.net. You may indicate that your software works in conjunction with PHP by saying "Foo for PHP" instead of calling it "PHP Foo" or "phpfoo" 

5. The PHP Group may publish revised and/or new versions of the license from time to time. Each version will be given a distinguishing version number. Once covered code has been published under a particular version of the license, you may always continue to use it under the terms of that version. You may also choose to use such covered code under the terms of any subsequent version of the license published by the PHP Group. No one other than the PHP Group has the right to modify the terms applicable to covered code created under this License.

6. Redistributions of any form whatsoever must retain the following acknowledgment: "This product includes PHP, freely available from <http://www.php.net/>".

THIS SOFTWARE IS PROVIDED BY THE PHP DEVELOPMENT TEAM ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PHP DEVELOPMENT TEAM OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


This software consists of voluntary contributions made by many individuals on behalf of the PHP Group.

The PHP Group can be contacted via Email at group@php.net.

For more information on the PHP Group and the PHP project, please see <http://www.php.net>.

This product includes the Zend Engine, freely available at <http://www.zend.com>.

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342

<?php
/**
 * @author Joas Schilling <nickvergessen@owncloud.com>
 * @author Morris Jobke <hey@morrisjobke.de>
 * @author Olivier Paroz <github@oparoz.com>
 * @author Robin Appelman <icewind@owncloud.com>
 * @author Thomas Müller <thomas.mueller@tmit.eu>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OC;

use OCP\IPreview;
use OCP\Preview\IProvider;

class PreviewManager implements IPreview {
	/** @var \OCP\IConfig */
	protected $config;

	/** @var bool */
	protected $providerListDirty = false;

	/** @var bool */
	protected $registeredCoreProviders = false;

	/** @var array */
	protected $providers = [];

	/** @var array mime type => support status */
	protected $mimeTypeSupportMap = [];

	/** @var array */
	protected $defaultProviders;

	/**
	 * Constructor
	 *
	 * @param \OCP\IConfig $config
	 */
	public function __construct(\OCP\IConfig $config) {
		$this->config = $config;
	}

	/**
	 * 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
	 *
	 * @param string $mimeTypeRegex Regex with the mime types that are supported by this provider
	 * @param \Closure $callable
	 * @return void
	 */
	public function registerProvider($mimeTypeRegex, \Closure $callable) {
		if (!$this->config->getSystemValue('enable_previews', true)) {
			return;
		}

		if (!isset($this->providers[$mimeTypeRegex])) {
			$this->providers[$mimeTypeRegex] = [];
		}
		$this->providers[$mimeTypeRegex][] = $callable;
		$this->providerListDirty = true;
	}

	/**
	 * Get all providers
	 * @return array
	 */
	public function getProviders() {
		if (!$this->config->getSystemValue('enable_previews', true)) {
			return [];
		}

		$this->registerCoreProviders();
		if ($this->providerListDirty) {
			$keys = array_map('strlen', array_keys($this->providers));
			array_multisort($keys, SORT_DESC, $this->providers);
			$this->providerListDirty = false;
		}

		return $this->providers;
	}

	/**
	 * Does the manager have any providers
	 * @return bool
	 */
	public function hasProviders() {
		$this->registerCoreProviders();
		return !empty($this->providers);
	}

	/**
	 * return a preview of a file
	 *
	 * @param string $file The path to the file where you want a thumbnail from
	 * @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
	 * @param boolean $scaleUp Scale smaller images up to the thumbnail size or not. Might look ugly
	 * @return \OCP\IImage
	 */
	public function createPreview($file, $maxX = 100, $maxY = 75, $scaleUp = false) {
		$preview = new \OC\Preview('', '/', $file, $maxX, $maxY, $scaleUp);
		return $preview->getPreview();
	}

	/**
	 * returns true if the passed mime type is supported
	 *
	 * @param string $mimeType
	 * @return boolean
	 */
	public function isMimeSupported($mimeType = '*') {
		if (!$this->config->getSystemValue('enable_previews', true)) {
			return false;
		}

		if (isset($this->mimeTypeSupportMap[$mimeType])) {
			return $this->mimeTypeSupportMap[$mimeType];
		}

		$this->registerCoreProviders();
		$providerMimeTypes = array_keys($this->providers);
		foreach ($providerMimeTypes as $supportedMimeType) {
			if (preg_match($supportedMimeType, $mimeType)) {
				$this->mimeTypeSupportMap[$mimeType] = true;
				return true;
			}
		}
		$this->mimeTypeSupportMap[$mimeType] = false;
		return false;
	}

	/**
	 * Check if a preview can be generated for a file
	 *
	 * @param \OCP\Files\FileInfo $file
	 * @return bool
	 */
	public function isAvailable(\OCP\Files\FileInfo $file) {
		if (!$this->config->getSystemValue('enable_previews', true)) {
			return false;
		}

		$this->registerCoreProviders();
		if (!$this->isMimeSupported($file->getMimetype())) {
			return false;
		}

		$mount = $file->getMountPoint();
		if ($mount and !$mount->getOption('previews', true)){
			return false;
		}

		foreach ($this->providers as $supportedMimeType => $providers) {
			if (preg_match($supportedMimeType, $file->getMimetype())) {
				foreach ($providers as $closure) {
					$provider = $closure();
					if (!($provider instanceof IProvider)) {
						continue;
					}

					/** @var $provider IProvider */
					if ($provider->isAvailable($file)) {
						return true;
					}
				}
			}
		}
		return false;
	}

	/**
	 * List of enabled default providers
	 *
	 * The following providers are enabled by default:
	 *  - OC\Preview\PNG
	 *  - OC\Preview\JPEG
	 *  - OC\Preview\GIF
	 *  - OC\Preview\BMP
	 *  - OC\Preview\XBitmap
	 *  - OC\Preview\MarkDown
	 *  - OC\Preview\MP3
	 *  - OC\Preview\TXT
	 *
	 * The following providers are disabled by default due to performance or privacy concerns:
	 *  - OC\Preview\Font
	 *  - OC\Preview\Illustrator
	 *  - OC\Preview\Movie
	 *  - OC\Preview\MSOfficeDoc
	 *  - OC\Preview\MSOffice2003
	 *  - OC\Preview\MSOffice2007
	 *  - OC\Preview\OpenDocument
	 *  - OC\Preview\PDF
	 *  - OC\Preview\Photoshop
	 *  - OC\Preview\Postscript
	 *  - OC\Preview\StarOffice
	 *  - OC\Preview\SVG
	 *  - OC\Preview\TIFF
	 *
	 * @return array
	 */
	protected function getEnabledDefaultProvider() {
		if ($this->defaultProviders !== null) {
			return $this->defaultProviders;
		}

		$imageProviders = [
			'OC\Preview\PNG',
			'OC\Preview\JPEG',
			'OC\Preview\GIF',
			'OC\Preview\BMP',
			'OC\Preview\XBitmap'
		];

		$this->defaultProviders = $this->config->getSystemValue('enabledPreviewProviders', array_merge([
			'OC\Preview\MarkDown',
			'OC\Preview\MP3',
			'OC\Preview\TXT',
		], $imageProviders));

		if (in_array('OC\Preview\Image', $this->defaultProviders)) {
			$this->defaultProviders = array_merge($this->defaultProviders, $imageProviders);
		}
		$this->defaultProviders = array_unique($this->defaultProviders);
		return $this->defaultProviders;
	}

	/**
	 * Register the default providers (if enabled)
	 *
	 * @param string $class
	 * @param string $mimeType
	 */
	protected function registerCoreProvider($class, $mimeType, $options = []) {
		if (in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
			$this->registerProvider($mimeType, function () use ($class, $options) {
				return new $class($options);
			});
		}
	}

	/**
	 * Register the default providers (if enabled)
	 */
	protected function registerCoreProviders() {
		if ($this->registeredCoreProviders) {
			return;
		}
		$this->registeredCoreProviders = true;

		$this->registerCoreProvider('OC\Preview\TXT', '/text\/plain/');
		$this->registerCoreProvider('OC\Preview\MarkDown', '/text\/(x-)?markdown/');
		$this->registerCoreProvider('OC\Preview\PNG', '/image\/png/');
		$this->registerCoreProvider('OC\Preview\JPEG', '/image\/jpeg/');
		$this->registerCoreProvider('OC\Preview\GIF', '/image\/gif/');
		$this->registerCoreProvider('OC\Preview\BMP', '/image\/bmp/');
		$this->registerCoreProvider('OC\Preview\XBitmap', '/image\/x-xbitmap/');
		$this->registerCoreProvider('OC\Preview\MP3', '/audio\/mpeg/');

		// SVG, Office and Bitmap require imagick
		if (extension_loaded('imagick')) {
			$checkImagick = new \Imagick();

			$imagickProviders = [
				'SVG'	=> ['mimetype' => '/image\/svg\+xml/', 'class' => '\OC\Preview\SVG'],
				'TIFF'	=> ['mimetype' => '/image\/tiff/', 'class' => '\OC\Preview\TIFF'],
				'PDF'	=> ['mimetype' => '/application\/pdf/', 'class' => '\OC\Preview\PDF'],
				'AI'	=> ['mimetype' => '/application\/illustrator/', 'class' => '\OC\Preview\Illustrator'],
				'PSD'	=> ['mimetype' => '/application\/x-photoshop/', 'class' => '\OC\Preview\Photoshop'],
				'EPS'	=> ['mimetype' => '/application\/postscript/', 'class' => '\OC\Preview\Postscript'],
				'TTF'	=> ['mimetype' => '/application\/(?:font-sfnt|x-font$)/', 'class' => '\OC\Preview\Font'],
			];

			foreach ($imagickProviders as $queryFormat => $provider) {
				$class = $provider['class'];
				if (!in_array(trim($class, '\\'), $this->getEnabledDefaultProvider())) {
					continue;
				}

				if (count($checkImagick->queryFormats($queryFormat)) === 1) {
					$this->registerCoreProvider($class, $provider['mimetype']);
				}
			}

			if (count($checkImagick->queryFormats('PDF')) === 1) {
				// Office previews are currently not supported on Windows
				if (!\OC_Util::runningOnWindows() && \OC_Helper::is_function_enabled('shell_exec')) {
					$officeFound = is_string($this->config->getSystemValue('preview_libreoffice_path', null));

					if (!$officeFound) {
						//let's see if there is libreoffice or openoffice on this machine
						$whichLibreOffice = shell_exec('command -v libreoffice');
						$officeFound = !empty($whichLibreOffice);
						if (!$officeFound) {
							$whichOpenOffice = shell_exec('command -v openoffice');
							$officeFound = !empty($whichOpenOffice);
						}
					}

					if ($officeFound) {
						$this->registerCoreProvider('\OC\Preview\MSOfficeDoc', '/application\/msword/');
						$this->registerCoreProvider('\OC\Preview\MSOffice2003', '/application\/vnd.ms-.*/');
						$this->registerCoreProvider('\OC\Preview\MSOffice2007', '/application\/vnd.openxmlformats-officedocument.*/');
						$this->registerCoreProvider('\OC\Preview\OpenDocument', '/application\/vnd.oasis.opendocument.*/');
						$this->registerCoreProvider('\OC\Preview\StarOffice', '/application\/vnd.sun.xml.*/');
					}
				}
			}
		}

		// Video requires avconv or ffmpeg and is therefor
		// currently not supported on Windows.
		if (in_array('OC\Preview\Movie', $this->getEnabledDefaultProvider()) && !\OC_Util::runningOnWindows()) {
			$avconvBinary = \OC_Helper::findBinaryPath('avconv');
			$ffmpegBinary = ($avconvBinary) ? null : \OC_Helper::findBinaryPath('ffmpeg');

			if ($avconvBinary || $ffmpegBinary) {
				// FIXME // a bit hacky but didn't want to use subclasses
				\OC\Preview\Movie::$avconvBinary = $avconvBinary;
				\OC\Preview\Movie::$ffmpegBinary = $ffmpegBinary;

				$this->registerCoreProvider('\OC\Preview\Movie', '/video\/.*/');
			}
		}
	}
}