aboutsummaryrefslogtreecommitdiffstats
path: root/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/Plugin.php
blob: cc06c83692f69a5251c57fb79e6afbe357e74dd3 (plain) (blame)
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
<?php

namespace Sabre\DAV\PartialUpdate;

use Sabre\DAV;

/**
 * Partial update plugin (Patch method)
 *
 * This plugin provides a way to modify only part of a target resource
 * It may bu used to update a file chunk, upload big a file into smaller
 * chunks or resume an upload.
 *
 * $patchPlugin = new \Sabre\DAV\PartialUpdate\Plugin();
 * $server->addPlugin($patchPlugin);
 *
 * @copyright Copyright (C) 2007-2013 fruux GmbH (https://fruux.com/).
 * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
 * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
 */
class Plugin extends DAV\ServerPlugin {

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

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

        $this->server = $server;
        $server->subscribeEvent('unknownMethod',array($this,'unknownMethod'));

    }

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

        return 'partialupdate';

    }

    /**
     * This method is called by the Server if the user used an HTTP method
     * the server didn't recognize.
     *
     * This plugin intercepts the PATCH methods.
     *
     * @param string $method
     * @param string $uri
     * @return bool|null
     */
    public function unknownMethod($method, $uri) {

        switch($method) {
            
            case 'PATCH':
                return $this->httpPatch($uri);

        }

    }

    /**
     * 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.
     * 
     * We claim to support PATCH method (partial update) if and only if
     *     - the node exist
     *     - the node implements our partial update interface
     *
     * @param string $uri
     * @return array
     */
    public function getHTTPMethods($uri) {
        
        $tree = $this->server->tree;
        
        if ($tree->nodeExists($uri) && 
            $tree->getNodeForPath($uri) instanceof IFile) {
            return array('PATCH');
         }
         
         return array();

    }

    /**
     * Returns a list of features for the HTTP OPTIONS Dav: header.
     *
     * @return array
     */
    public function getFeatures() {

        return array('sabredav-partialupdate');

    }

    /**
     * Patch an uri
     *
     * The WebDAV patch request can be used to modify only a part of an 
     * existing resource. If the resource does not exist yet and the first
     * offset is not 0, the request fails
     *
     * @param string $uri
     * @return void
     */
    protected function httpPatch($uri) {

        // Get the node. Will throw a 404 if not found
        $node = $this->server->tree->getNodeForPath($uri);
        if (!($node instanceof IFile)) {
            throw new DAV\Exception\MethodNotAllowed('The target resource does not support the PATCH method.');
        }

        $range = $this->getHTTPUpdateRange();

        if (!$range) {
            throw new DAV\Exception\BadRequest('No valid "X-Update-Range" found in the headers');
        }
        
        $contentType = strtolower(
            $this->server->httpRequest->getHeader('Content-Type')
        );
        
        if ($contentType != 'application/x-sabredav-partialupdate') {
            throw new DAV\Exception\UnsupportedMediaType('Unknown Content-Type header "' . $contentType . '"');
        }

        $len = $this->server->httpRequest->getHeader('Content-Length');

        // Load the begin and end data
        $start = ($range[0])?$range[0]:0;
        $end   = ($range[1])?$range[1]:$len-1;

        // Check consistency
        if($end < $start)
            throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[1] . ') is lower than the start offset (' . $range[0] . ')');
        if($end - $start + 1 != $len)
            throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length (' . $len . ') is not consistent with begin (' . $range[0] . ') and end (' . $range[1] . ') offsets');

        // Checking If-None-Match and related headers.
        if (!$this->server->checkPreconditions()) return;

        if (!$this->server->broadcastEvent('beforeWriteContent',array($uri, $node, null)))
            return;

        $body = $this->server->httpRequest->getBody();
        $etag = $node->putRange($body, $start-1);

        $this->server->broadcastEvent('afterWriteContent',array($uri, $node));

        $this->server->httpResponse->setHeader('Content-Length','0');
        if ($etag) $this->server->httpResponse->setHeader('ETag',$etag);
        $this->server->httpResponse->sendStatus(204);

        return false;

    }
    
   /**
     * Returns the HTTP custom range update header
     *
     * This method returns null if there is no well-formed HTTP range request
     * header or array($start, $end).
     *
     * The first number is the offset of the first byte in the range.
     * The second number is the offset of the last byte in the range.
     *
     * If the second offset is null, it should be treated as the offset of the last byte of the entity
     * If the first offset is null, the second offset should be used to retrieve the last x bytes of the entity
     *
     * @return array|null
     */
    public function getHTTPUpdateRange() {

        $range = $this->server->httpRequest->getHeader('X-Update-Range');
        if (is_null($range)) return null;

        // Matching "Range: bytes=1234-5678: both numbers are optional

        if (!preg_match('/^bytes=([0-9]*)-([0-9]*)$/i',$range,$matches)) return null;

        if ($matches[1]==='' && $matches[2]==='') return null;

        return array(
            $matches[1]!==''?$matches[1]:null,
            $matches[2]!==''?$matches[2]:null,
        );

    }
}