summaryrefslogtreecommitdiffstats
path: root/apps/files_sharing/lib/sharedstorage.php
blob: 2252ec6a1a6af9ff9a82fce6b530e8d7bbc27876 (plain)
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
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
<?php
/**
 * ownCloud
 *
 * @author Bjoern Schiessle, Michael Gapczynski
 * @copyright 2011 Michael Gapczynski <mtgap@owncloud.com>
 *            2014 Bjoern Schiessle <schiessle@owncloud.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OC\Files\Storage;

/**
 * Convert target path to source path and pass the function call to the correct storage provider
 */
class Shared extends \OC\Files\Storage\Common {

	private $share;   // the shared resource
	private $files = array();

	public function __construct($arguments) {
		$this->share = $arguments['share'];
	}

	/**
	 * @breif get id of the mount point
	 * @return string
	 */
	public function getId() {
		return 'shared::' . $this->getMountPoint();
	}

	/**
	 * @breif get file cache of the shared item source
	 * @return string
	 */
	public function getSourceId() {
		return $this->share['file_source'];
	}

	/**
	 * @brief Get the source file path, permissions, and owner for a shared file
	 * @param string Shared target file path
	 * @param string $target
	 * @return Returns array with the keys path, permissions, and owner or false if not found
	 */
	public function getFile($target) {
		if (!isset($this->files[$target])) {
			// Check for partial files
			if (pathinfo($target, PATHINFO_EXTENSION) === 'part') {
				$source = \OC_Share_Backend_File::getSource(substr($target, 0, -5), $this->getMountPoint(), $this->getItemType());
				if ($source) {
					$source['path'] .= '.part';
					// All partial files have delete permission
					$source['permissions'] |= \OCP\PERMISSION_DELETE;
				}
			} else {
				$source = \OC_Share_Backend_File::getSource($target, $this->getMountPoint(), $this->getItemType());
			}
			$this->files[$target] = $source;
		}
		return $this->files[$target];
	}

	/**
	 * @brief Get the source file path for a shared file
	 * @param string Shared target file path
	 * @param string $target
	 * @return string source file path or false if not found
	 */
	public function getSourcePath($target) {
		$source = $this->getFile($target);
		if ($source) {
			if (!isset($source['fullPath'])) {
				\OC\Files\Filesystem::initMountPoints($source['fileOwner']);
				$mount = \OC\Files\Filesystem::getMountByNumericId($source['storage']);
				if (is_array($mount) && !empty($mount)) {
					$this->files[$target]['fullPath'] = $mount[key($mount)]->getMountPoint() . $source['path'];
				} else {
					$this->files[$target]['fullPath'] = false;
					\OCP\Util::writeLog('files_sharing', "Unable to get mount for shared storage '" . $source['storage'] . "' user '" . $source['fileOwner'] . "'", \OCP\Util::ERROR);
				}
			}
			return $this->files[$target]['fullPath'];
		}
		return false;
	}

	/**
	 * @brief Get the permissions granted for a shared file
	 * @param string Shared target file path
	 * @return int CRUDS permissions granted or false if not found
	 */
	public function getPermissions($target) {
		$source = $this->getFile($target);
		if ($source) {
			return $source['permissions'];
		}
		return false;
	}

	public function mkdir($path) {
		if ($path == '' || $path == '/' || !$this->isCreatable(dirname($path))) {
			return false;
		} else if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->mkdir($internalPath);
		}
		return false;
	}

	public function rmdir($path) {
		if (($source = $this->getSourcePath($path)) && $this->isDeletable($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->rmdir($internalPath);
		}
		return false;
	}

	public function opendir($path) {
		$source = $this->getSourcePath($path);
		list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
		return $storage->opendir($internalPath);
	}

	public function is_dir($path) {
		$source = $this->getSourcePath($path);
		list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
		return $storage->is_dir($internalPath);
	}

	public function is_file($path) {
		if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->is_file($internalPath);
		}
		return false;
	}

	public function stat($path) {
		if ($path == '' || $path == '/') {
			$stat['size'] = $this->filesize($path);
			$stat['mtime'] = $this->filemtime($path);
			return $stat;
		} else if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->stat($internalPath);
		}
		return false;
	}

	public function filetype($path) {
		if ($path == '' || $path == '/') {
			return 'dir';
		} else if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->filetype($internalPath);
		}
		return false;
	}

	public function filesize($path) {
		if ($path == '' || $path == '/' || $this->is_dir($path)) {
			return 0;
		} else if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->filesize($internalPath);
		}
		return false;
	}

	public function isCreatable($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		return ($this->getPermissions($path) & \OCP\PERMISSION_CREATE);
	}

	public function isReadable($path) {
		return $this->file_exists($path);
	}

	public function isUpdatable($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		return ($this->getPermissions($path) & \OCP\PERMISSION_UPDATE);
	}

	public function isDeletable($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		return ($this->getPermissions($path) & \OCP\PERMISSION_DELETE);
	}

	public function isSharable($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		return ($this->getPermissions($path) & \OCP\PERMISSION_SHARE);
	}

	public function file_exists($path) {
		if ($path == '' || $path == '/') {
			return true;
		} else if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->file_exists($internalPath);
		}
		return false;
	}

	public function filemtime($path) {
		$source = $this->getSourcePath($path);
		list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
		return $storage->filemtime($internalPath);
	}

	public function file_get_contents($path) {
		$source = $this->getSourcePath($path);
		if ($source) {
			$info = array(
				'target' => $this->getMountPoint() . $path,
				'source' => $source,
			);
			\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_get_contents', $info);
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->file_get_contents($internalPath);
		}
	}

	public function file_put_contents($path, $data) {
		if ($source = $this->getSourcePath($path)) {
			// Check if permission is granted
			if (($this->file_exists($path) && !$this->isUpdatable($path))
				|| ($this->is_dir($path) && !$this->isCreatable($path))
			) {
				return false;
			}
			$info = array(
				'target' => $this->getMountPoint() . '/' . $path,
				'source' => $source,
			);
			\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_put_contents', $info);
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			$result = $storage->file_put_contents($internalPath, $data);
			return $result;
		}
		return false;
	}

	public function unlink($path) {
		// Delete the file if DELETE permission is granted
		$path = ($path === false) ? '' : $path;
		if ($source = $this->getSourcePath($path)) {
			if ($this->isDeletable($path)) {
				list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
				return $storage->unlink($internalPath);
			}
		}
		return false;
	}

	/**
	 * @brief Format a path to be relative to the /user/files/ directory
	 * @param string $path the absolute path
	 * @return string e.g. turns '/admin/files/test.txt' into '/test.txt'
	 */
	private static function stripUserFilesPath($path) {
		$trimmed = ltrim($path, '/');
		$split = explode('/', $trimmed);

		// it is not a file relative to data/user/files
		if (count($split) < 3 || $split[1] !== 'files') {
			\OCP\Util::writeLog('file sharing',
					'Can not strip userid and "files/" from path: ' . $path,
					\OCP\Util::DEBUG);
			return false;
		}

		// skip 'user' and 'files'
		$sliced = array_slice($split, 2);
		$relPath = implode('/', $sliced);

		return '/' . $relPath;
	}

	/**
	 * @brief rename a shared folder/file
	 * @param string $sourcePath
	 * @param string $targetPath
	 * @return bool
	 */
	private function renameMountPoint($sourcePath, $targetPath) {

		// it shouldn't be possible to move a Shared storage into another one
		list($targetStorage, ) = \OC\Files\Filesystem::resolvePath($targetPath);
		if ($targetStorage instanceof \OC\Files\Storage\Shared) {
			\OCP\Util::writeLog('file sharing',
					'It is not allowed to move one mount point into another one',
					\OCP\Util::DEBUG);
			return false;
		}

		$relTargetPath = $this->stripUserFilesPath($targetPath);

		// if the user renames a mount point from a group share we need to create a new db entry
		// for the unique name
		if ($this->getShareType() === \OCP\Share::SHARE_TYPE_GROUP && $this->uniqueNameSet() === false) {
			$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`,'
			.' `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`,'
			.' `file_target`, `token`, `parent`) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)');
			$arguments = array($this->share['item_type'], $this->share['item_source'], $this->share['item_target'],
				2, \OCP\User::getUser(), $this->share['uid_owner'], $this->share['permissions'], $this->share['stime'], $this->share['file_source'],
				$relTargetPath, $this->share['token'], $this->share['id']);

		} else {
			// rename mount point
			$query = \OC_DB::prepare(
					'Update `*PREFIX*share`
						SET `file_target` = ?
						WHERE `id` = ?'
					);
			$arguments = array($relTargetPath, $this->getShareId());
		}

		$result = $query->execute($arguments);

		if ($result) {
			// update the mount manager with the new paths
			$mountManager = \OC\Files\Filesystem::getMountManager();
			$mount = $mountManager->find($sourcePath);
			$mount->setMountPoint($targetPath . '/');
			$mountManager->addMount($mount);
			$mountManager->removeMount($sourcePath . '/');
			$this->setUniqueName();
			$this->setMountPoint($relTargetPath);

		} else {
			\OCP\Util::writeLog('file sharing',
					'Could not rename mount point for shared folder "' . $sourcePath . '" to "' . $targetPath . '"',
					\OCP\Util::ERROR);
		}

		return $result;
	}


	public function rename($path1, $path2) {

		$sourceMountPoint = \OC\Files\Filesystem::getMountPoint($path1);
		$targetMountPoint = \OC\Files\Filesystem::getMountPoint($path2);
		$relPath1 = \OCA\Files_Sharing\Helper::stripUserFilesPath($path1);
		$relPath2 = \OCA\Files_Sharing\Helper::stripUserFilesPath($path2);

		// if we renamed the mount point we need to adjust the file_target in the
		// database
		if (\OC\Files\Filesystem::normalizePath($sourceMountPoint) === \OC\Files\Filesystem::normalizePath($path1)) {
			return $this->renameMountPoint($path1, $path2);
		}


		if (	// Within the same mount point, we only need UPDATE permissions
				($sourceMountPoint === $targetMountPoint && $this->isUpdatable($sourceMountPoint)) ||
				// otherwise DELETE and CREATE permissions required
				($this->isDeletable($path1) && $this->isCreatable(dirname($path2)))) {

			list($user1, $path1) = \OCA\Files_Sharing\Helper::getUidAndFilename($relPath1);
			$targetFilename = basename($relPath2);
			list($user2, $path2) = \OCA\Files_Sharing\Helper::getUidAndFilename(dirname($relPath2));
			$rootView = new \OC\Files\View('');
			return $rootView->rename('/' . $user1 . '/files/' . $path1, '/' . $user2 . '/files/' . $path2 . '/' . $targetFilename);
		}

		return false;
	}

	public function copy($path1, $path2) {
		// Copy the file if CREATE permission is granted
		if ($this->isCreatable(dirname($path2))) {
			$oldSource = $this->getSourcePath($path1);
			$newSource = $this->getSourcePath(dirname($path2)) . '/' . basename($path2);
			$rootView = new \OC\Files\View('');
			return $rootView->copy($oldSource, $newSource);
		}
		return false;
	}

	public function fopen($path, $mode) {
		if ($source = $this->getSourcePath($path)) {
			switch ($mode) {
				case 'r+':
				case 'rb+':
				case 'w+':
				case 'wb+':
				case 'x+':
				case 'xb+':
				case 'a+':
				case 'ab+':
				case 'w':
				case 'wb':
				case 'x':
				case 'xb':
				case 'a':
				case 'ab':
					$exists = $this->file_exists($path);
					if ($exists && !$this->isUpdatable($path)) {
						return false;
					}
					if (!$exists && !$this->isCreatable(dirname($path))) {
						return false;
					}
			}
			$info = array(
				'target' => $this->getMountPoint() . $path,
				'source' => $source,
				'mode' => $mode,
			);
			\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'fopen', $info);
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->fopen($internalPath, $mode);
		}
		return false;
	}

	public function getMimeType($path) {
		if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->getMimeType($internalPath);
		}
		return false;
	}

	public function free_space($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		$source = $this->getSourcePath($path);
		if ($source) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->free_space($internalPath);
		}
		return \OC\Files\SPACE_UNKNOWN;
	}

	public function getLocalFile($path) {
		if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->getLocalFile($internalPath);
		}
		return false;
	}

	public function touch($path, $mtime = null) {
		if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->touch($internalPath, $mtime);
		}
		return false;
	}

	public static function setup($options) {
		$shares = \OCP\Share::getItemsSharedWith('file');
		if (!\OCP\User::isLoggedIn() || \OCP\User::getUser() != $options['user']
			|| $shares
		) {
			foreach ($shares as $share) {
				\OC\Files\Filesystem::mount('\OC\Files\Storage\Shared',
						array(
							'share' => $share,
							),
						$options['user_dir'] . '/' . $share['file_target']);
			}
		}
	}

	/**
	 * @brief return mount point of share, relative to data/user/files
	 * @return string
	 */
	public function getMountPoint() {
		return $this->share['file_target'];
	}

	/**
	 * @brief get share type
	 * @return integer can be single user share (0) group share (1), unique group share name (2)
	 */
	private function getShareType() {
		return $this->share['share_type'];
	}

	private function setMountPoint($path) {
		$this->share['file_target'] = $path;
	}

	/**
	 * @brief does the group share already has a user specific unique name
	 * @return bool
	 */
	private function uniqueNameSet() {
		return (isset($this->share['unique_name']) && $this->share['unique_name']);
	}

	/**
	 * @brief the share now uses a unique name of this user
	 */
	private function setUniqueName() {
		$this->share['unique_name'] = true;
	}

	/**
	 * @brief get share ID
	 * @return integer unique share ID
	 */
	private function getShareId() {
		return $this->share['id'];
	}

	/**
	 * @brief get the user who shared the file
	 * @return string
	 */
	public function getSharedFrom() {
		return $this->share['uid_owner'];
	}

	/**
	 * @brief return share type, can be "file" or "folder"
	 * @return string
	 */
	public function getItemType() {
		return $this->share['item_type'];
	}

	public function hasUpdated($path, $time) {
		return $this->filemtime($path) > $time;
	}

	public function getCache($path = '') {
		return new \OC\Files\Cache\Shared_Cache($this);
	}

	public function getScanner($path = '') {
		return new \OC\Files\Cache\Scanner($this);
	}

	public function getPermissionsCache($path = '') {
		return new \OC\Files\Cache\Shared_Permissions($this);
	}

	public function getWatcher($path = '') {
		return new \OC\Files\Cache\Shared_Watcher($this);
	}

	public function getOwner($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		$source = $this->getFile($path);
		if ($source) {
			return $source['fileOwner'];
		}
		return false;
	}

	public function getETag($path) {
		if ($path == '') {
			$path = $this->getMountPoint();
		}
		if ($source = $this->getSourcePath($path)) {
			list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
			return $storage->getETag($internalPath);
		}
		return null;
	}

}