aboutsummaryrefslogblamecommitdiffstats
path: root/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
blob: 4855b707635e0a355a047219042670dbb26431b1 (plain) (tree)
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












































































































































































































































































































































































































































































































































































































                                                                                                                                                 
<?php

namespace Sabre\DAV\Locks;

use Sabre\DAV;
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;

/**
 * Locking plugin
 *
 * This plugin provides locking support to a WebDAV server.
 * The easiest way to get started, is by hooking it up as such:
 *
 * $lockBackend = new Sabre\DAV\Locks\Backend\File('./mylockdb');
 * $lockPlugin = new Sabre\DAV\Locks\Plugin($lockBackend);
 * $server->addPlugin($lockPlugin);
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class Plugin extends DAV\ServerPlugin {

    /**
     * locksBackend
     *
     * @var Backend\Backend\Interface
     */
    protected $locksBackend;

    /**
     * server
     *
     * @var Sabre\DAV\Server
     */
    protected $server;

    /**
     * __construct
     *
     * @param Backend\BackendInterface $locksBackend
     */
    function __construct(Backend\BackendInterface $locksBackend) {

        $this->locksBackend = $locksBackend;

    }

    /**
     * Initializes the plugin
     *
     * This method is automatically called by the Server class after addPlugin.
     *
     * @param DAV\Server $server
     * @return void
     */
    function initialize(DAV\Server $server) {

        $this->server = $server;

        $this->server->xml->elementMap['{DAV:}lockinfo'] = 'Sabre\\DAV\\Xml\\Request\\Lock';

        $server->on('method:LOCK',    [$this, 'httpLock']);
        $server->on('method:UNLOCK',  [$this, 'httpUnlock']);
        $server->on('validateTokens', [$this, 'validateTokens']);
        $server->on('propFind',       [$this, 'propFind']);
        $server->on('afterUnbind',    [$this, 'afterUnbind']);

    }

    /**
     * Returns a plugin name.
     *
     * Using this name other plugins will be able to access other plugins
     * using Sabre\DAV\Server::getPlugin
     *
     * @return string
     */
    function getPluginName() {

        return 'locks';

    }

    /**
     * This method is called after most properties have been found
     * it allows us to add in any Lock-related properties
     *
     * @param DAV\PropFind $propFind
     * @param DAV\INode $node
     * @return void
     */
    function propFind(DAV\PropFind $propFind, DAV\INode $node) {

        $propFind->handle('{DAV:}supportedlock', function() {
            return new DAV\Xml\Property\SupportedLock();
        });
        $propFind->handle('{DAV:}lockdiscovery', function() use ($propFind) {
            return new DAV\Xml\Property\LockDiscovery(
                $this->getLocks($propFind->getPath())
            );
        });

    }

    /**
     * Use this method to tell the server this plugin defines additional
     * HTTP methods.
     *
     * This method is passed a uri. It should only return HTTP methods that are
     * available for the specified uri.
     *
     * @param string $uri
     * @return array
     */
    function getHTTPMethods($uri) {

        return ['LOCK','UNLOCK'];

    }

    /**
     * Returns a list of features for the HTTP OPTIONS Dav: header.
     *
     * In this case this is only the number 2. The 2 in the Dav: header
     * indicates the server supports locks.
     *
     * @return array
     */
    function getFeatures() {

        return [2];

    }

    /**
     * Returns all lock information on a particular uri
     *
     * This function should return an array with Sabre\DAV\Locks\LockInfo objects. If there are no locks on a file, return an empty array.
     *
     * Additionally there is also the possibility of locks on parent nodes, so we'll need to traverse every part of the tree
     * If the $returnChildLocks argument is set to true, we'll also traverse all the children of the object
     * for any possible locks and return those as well.
     *
     * @param string $uri
     * @param bool $returnChildLocks
     * @return array
     */
    function getLocks($uri, $returnChildLocks = false) {

        return $this->locksBackend->getLocks($uri, $returnChildLocks);

    }

    /**
     * Locks an uri
     *
     * The WebDAV lock request can be operated to either create a new lock on a file, or to refresh an existing lock
     * If a new lock is created, a full XML body should be supplied, containing information about the lock such as the type
     * of lock (shared or exclusive) and the owner of the lock
     *
     * If a lock is to be refreshed, no body should be supplied and there should be a valid If header containing the lock
     *
     * Additionally, a lock can be requested for a non-existent file. In these case we're obligated to create an empty file as per RFC4918:S7.3
     *
     * @param RequestInterface $request
     * @param ResponseInterface $response
     * @return bool
     */
    function httpLock(RequestInterface $request, ResponseInterface $response) {

        $uri = $request->getPath();

        $existingLocks = $this->getLocks($uri);

        if ($body = $request->getBodyAsString()) {
            // This is a new lock request

            $existingLock = null;
            // Checking if there's already non-shared locks on the uri.
            foreach ($existingLocks as $existingLock) {
                if ($existingLock->scope === LockInfo::EXCLUSIVE) {
                    throw new DAV\Exception\ConflictingLock($existingLock);
                }
            }

            $lockInfo = $this->parseLockRequest($body);
            $lockInfo->depth = $this->server->getHTTPDepth();
            $lockInfo->uri = $uri;
            if ($existingLock && $lockInfo->scope != LockInfo::SHARED)
                throw new DAV\Exception\ConflictingLock($existingLock);

        } else {

            // Gonna check if this was a lock refresh.
            $existingLocks = $this->getLocks($uri);
            $conditions = $this->server->getIfConditions($request);
            $found = null;

            foreach ($existingLocks as $existingLock) {
                foreach ($conditions as $condition) {
                    foreach ($condition['tokens'] as $token) {
                        if ($token['token'] === 'opaquelocktoken:' . $existingLock->token) {
                            $found = $existingLock;
                            break 3;
                        }
                    }
                }
            }

            // If none were found, this request is in error.
            if (is_null($found)) {
                if ($existingLocks) {
                    throw new DAV\Exception\Locked(reset($existingLocks));
                } else {
                    throw new DAV\Exception\BadRequest('An xml body is required for lock requests');
                }

            }

            // This must have been a lock refresh
            $lockInfo = $found;

            // The resource could have been locked through another uri.
            if ($uri != $lockInfo->uri) $uri = $lockInfo->uri;

        }

        if ($timeout = $this->getTimeoutHeader()) $lockInfo->timeout = $timeout;

        $newFile = false;

        // If we got this far.. we should go check if this node actually exists. If this is not the case, we need to create it first
        try {
            $this->server->tree->getNodeForPath($uri);

            // We need to call the beforeWriteContent event for RFC3744
            // Edit: looks like this is not used, and causing problems now.
            //
            // See Issue 222
            // $this->server->emit('beforeWriteContent',array($uri));

        } catch (DAV\Exception\NotFound $e) {

            // It didn't, lets create it
            $this->server->createFile($uri, fopen('php://memory', 'r'));
            $newFile = true;

        }

        $this->lockNode($uri, $lockInfo);

        $response->setHeader('Content-Type', 'application/xml; charset=utf-8');
        $response->setHeader('Lock-Token', '<opaquelocktoken:' . $lockInfo->token . '>');
        $response->setStatus($newFile ? 201 : 200);
        $response->setBody($this->generateLockResponse($lockInfo));

        // Returning false will interupt the event chain and mark this method
        // as 'handled'.
        return false;

    }

    /**
     * Unlocks a uri
     *
     * This WebDAV method allows you to remove a lock from a node. The client should provide a valid locktoken through the Lock-token http header
     * The server should return 204 (No content) on success
     *
     * @param RequestInterface $request
     * @param ResponseInterface $response
     * @return void
     */
    function httpUnlock(RequestInterface $request, ResponseInterface $response) {

        $lockToken = $request->getHeader('Lock-Token');

        // If the locktoken header is not supplied, we need to throw a bad request exception
        if (!$lockToken) throw new DAV\Exception\BadRequest('No lock token was supplied');

        $path = $request->getPath();
        $locks = $this->getLocks($path);

        // Windows sometimes forgets to include < and > in the Lock-Token
        // header
        if ($lockToken[0] !== '<') $lockToken = '<' . $lockToken . '>';

        foreach ($locks as $lock) {

            if ('<opaquelocktoken:' . $lock->token . '>' == $lockToken) {

                $this->unlockNode($path, $lock);
                $response->setHeader('Content-Length', '0');
                $response->setStatus(204);

                // Returning false will break the method chain, and mark the
                // method as 'handled'.
                return false;

            }

        }

        // If we got here, it means the locktoken was invalid
        throw new DAV\Exception\LockTokenMatchesRequestUri();

    }

    /**
     * This method is called after a node is deleted.
     *
     * We use this event to clean up any locks that still exist on the node.
     *
     * @param string $path
     * @return void
     */
    function afterUnbind($path) {

        $locks = $this->getLocks($path, $includeChildren = true);
        foreach ($locks as $lock) {
            $this->unlockNode($path, $lock);
        }

    }

    /**
     * Locks a uri
     *
     * All the locking information is supplied in the lockInfo object. The object has a suggested timeout, but this can be safely ignored
     * It is important that if the existing timeout is ignored, the property is overwritten, as this needs to be sent back to the client
     *
     * @param string $uri
     * @param LockInfo $lockInfo
     * @return bool
     */
    function lockNode($uri, LockInfo $lockInfo) {

        if (!$this->server->emit('beforeLock', [$uri, $lockInfo])) return;
        return $this->locksBackend->lock($uri, $lockInfo);

    }

    /**
     * Unlocks a uri
     *
     * This method removes a lock from a uri. It is assumed all the supplied information is correct and verified
     *
     * @param string $uri
     * @param LockInfo $lockInfo
     * @return bool
     */
    function unlockNode($uri, LockInfo $lockInfo) {

        if (!$this->server->emit('beforeUnlock', [$uri, $lockInfo])) return;
        return $this->locksBackend->unlock($uri, $lockInfo);

    }


    /**
     * Returns the contents of the HTTP Timeout header.
     *
     * The method formats the header into an integer.
     *
     * @return int
     */
    function getTimeoutHeader() {

        $header = $this->server->httpRequest->getHeader('Timeout');

        if ($header) {

            if (stripos($header, 'second-') === 0) $header = (int)(substr($header, 7));
            elseif (stripos($header, 'infinite') === 0) $header = LockInfo::TIMEOUT_INFINITE;
            else throw new DAV\Exception\BadRequest('Invalid HTTP timeout header');

        } else {

            $header = 0;

        }

        return $header;

    }

    /**
     * Generates the response for successful LOCK requests
     *
     * @param LockInfo $lockInfo
     * @return string
     */
    protected function generateLockResponse(LockInfo $lockInfo) {

        return $this->server->xml->write('{DAV:}prop', [
            '{DAV:}lockdiscovery' =>
                new DAV\Xml\Property\LockDiscovery([$lockInfo])
        ]);
    }

    /**
     * The validateTokens event is triggered before every request.
     *
     * It's a moment where this plugin can check all the supplied lock tokens
     * in the If: header, and check if they are valid.
     *
     * In addition, it will also ensure that it checks any missing lokens that
     * must be present in the request, and reject requests without the proper
     * tokens.
     *
     * @param RequestInterface $request
     * @param mixed $conditions
     * @return void
     */
    function validateTokens(RequestInterface $request, &$conditions) {

        // First we need to gather a list of locks that must be satisfied.
        $mustLocks = [];
        $method = $request->getMethod();

        // Methods not in that list are operations that doesn't alter any
        // resources, and we don't need to check the lock-states for.
        switch ($method) {

            case 'DELETE' :
                $mustLocks = array_merge($mustLocks, $this->getLocks(
                    $request->getPath(),
                    true
                ));
                break;
            case 'MKCOL' :
            case 'MKCALENDAR' :
            case 'PROPPATCH' :
            case 'PUT' :
            case 'PATCH' :
                $mustLocks = array_merge($mustLocks, $this->getLocks(
                    $request->getPath(),
                    false
                ));
                break;
            case 'MOVE' :
                $mustLocks = array_merge($mustLocks, $this->getLocks(
                    $request->getPath(),
                    true
                ));
                $mustLocks = array_merge($mustLocks, $this->getLocks(
                    $this->server->calculateUri($request->getHeader('Destination')),
                    false
                ));
                break;
            case 'COPY' :
                $mustLocks = array_merge($mustLocks, $this->getLocks(
                    $this->server->calculateUri($request->getHeader('Destination')),
                    false
                ));
                break;
            case 'LOCK' :
                //Temporary measure.. figure out later why this is needed
                // Here we basically ignore all incoming tokens...
                foreach ($conditions as $ii => $condition) {
                    foreach ($condition['tokens'] as $jj => $token) {
                        $conditions[$ii]['tokens'][$jj]['validToken'] = true;
                    }
                }
                return;

        }

        // It's possible that there's identical locks, because of shared
        // parents. We're removing the duplicates here.
        $tmp = [];
        foreach ($mustLocks as $lock) $tmp[$lock->token] = $lock;
        $mustLocks = array_values($tmp);

        foreach ($conditions as $kk => $condition) {

            foreach ($condition['tokens'] as $ii => $token) {

                // Lock tokens always start with opaquelocktoken:
                if (substr($token['token'], 0, 16) !== 'opaquelocktoken:') {
                    continue;
                }

                $checkToken = substr($token['token'], 16);
                // Looping through our list with locks.
                foreach ($mustLocks as $jj => $mustLock) {

                    if ($mustLock->token == $checkToken) {

                        // We have a match!
                        // Removing this one from mustlocks
                        unset($mustLocks[$jj]);

                        // Marking the condition as valid.
                        $conditions[$kk]['tokens'][$ii]['validToken'] = true;

                        // Advancing to the next token
                        continue 2;

                    }

                }

                // If we got here, it means that there was a
                // lock-token, but it was not in 'mustLocks'.
                //
                // This is an edge-case, as it could mean that token
                // was specified with a url that was not 'required' to
                // check. So we're doing one extra lookup to make sure
                // we really don't know this token.
                //
                // This also gets triggered when the user specified a
                // lock-token that was expired.
                $oddLocks = $this->getLocks($condition['uri']);
                foreach ($oddLocks as $oddLock) {

                    if ($oddLock->token === $checkToken) {

                        // We have a hit!
                        $conditions[$kk]['tokens'][$ii]['validToken'] = true;
                        continue 2;

                    }
                }

                // If we get all the way here, the lock-token was
                // really unknown.


            }

        }

        // If there's any locks left in the 'mustLocks' array, it means that
        // the resource was locked and we must block it.
        if ($mustLocks) {

            throw new DAV\Exception\Locked(reset($mustLocks));

        }

    }

    /**
     * Parses a webdav lock xml body, and returns a new Sabre\DAV\Locks\LockInfo object
     *
     * @param string $body
     * @return LockInfo
     */
    protected function parseLockRequest($body) {

        $result = $this->server->xml->expect(
            '{DAV:}lockinfo',
            $body
        );

        $lockInfo = new LockInfo();

        $lockInfo->owner = $result->owner;
        $lockInfo->token = DAV\UUIDUtil::getUUID();
        $lockInfo->scope = $result->scope;

        return $lockInfo;

    }

    /**
     * Returns a bunch of meta-data about the plugin.
     *
     * Providing this information is optional, and is mainly displayed by the
     * Browser plugin.
     *
     * The description key in the returned array may contain html and will not
     * be sanitized.
     *
     * @return array
     */
    function getPluginInfo() {

        return [
            'name'        => $this->getPluginName(),
            'description' => 'The locks plugin turns this server into a class-2 WebDAV server and adds support for LOCK and UNLOCK',
            'link'        => 'http://sabre.io/dav/locks/',
        ];

    }

}