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
|
<?php
/**
* Copyright (c) 2011 Bart Visscher bartv@thisnet.nl
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
class OC_Response {
const STATUS_FOUND = 304;
const STATUS_NOT_MODIFIED = 304;
const STATUS_TEMPORARY_REDIRECT = 307;
const STATUS_BAD_REQUEST = 400;
const STATUS_NOT_FOUND = 404;
const STATUS_INTERNAL_SERVER_ERROR = 500;
const STATUS_SERVICE_UNAVAILABLE = 503;
/**
* Enable response caching by sending correct HTTP headers
* @param integer $cache_time time to cache the response
* >0 cache time in seconds
* 0 and <0 enable default browser caching
* null cache indefinitly
*/
static public function enableCaching($cache_time = null) {
if (is_numeric($cache_time)) {
header('Pragma: public');// enable caching in IE
if ($cache_time > 0) {
self::setExpiresHeader('PT'.$cache_time.'S');
header('Cache-Control: max-age='.$cache_time.', must-revalidate');
}
else {
self::setExpiresHeader(0);
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
}
}
else {
header('Cache-Control: cache');
header('Pragma: cache');
}
}
/**
* disable browser caching
* @see enableCaching with cache_time = 0
*/
static public function disableCaching() {
self::enableCaching(0);
}
/**
* Set response status
* @param int $status a HTTP status code, see also the STATUS constants
*/
static public function setStatus($status) {
$protocol = $_SERVER['SERVER_PROTOCOL'];
switch($status) {
case self::STATUS_NOT_MODIFIED:
$status = $status . ' Not Modified';
break;
case self::STATUS_TEMPORARY_REDIRECT:
if ($protocol == 'HTTP/1.1') {
$status = $status . ' Temporary Redirect';
break;
} else {
$status = self::STATUS_FOUND;
// fallthrough
}
case self::STATUS_FOUND;
$status = $status . ' Found';
break;
case self::STATUS_NOT_FOUND;
$status = $status . ' Not Found';
break;
case self::STATUS_INTERNAL_SERVER_ERROR;
$status = $status . ' Internal Server Error';
break;
case self::STATUS_SERVICE_UNAVAILABLE;
$status = $status . ' Service Unavailable';
break;
}
header($protocol.' '.$status);
}
/**
* Send redirect response
* @param string $location to redirect to
*/
static public function redirect($location) {
self::setStatus(self::STATUS_TEMPORARY_REDIRECT);
header('Location: '.$location);
}
/**
* Set reponse expire time
* @param string|DateTime $expires date-time when the response expires
* string for DateInterval from now
* DateTime object when to expire response
*/
static public function setExpiresHeader($expires) {
if (is_string($expires) && $expires[0] == 'P') {
$interval = $expires;
$expires = new DateTime('now');
$expires->add(new DateInterval($interval));
}
if ($expires instanceof DateTime) {
$expires->setTimezone(new DateTimeZone('GMT'));
$expires = $expires->format(DateTime::RFC2822);
}
header('Expires: '.$expires);
}
/**
* Checks and set ETag header, when the request matches sends a
* 'not modified' response
* @param string $etag token to use for modification check
*/
static public function setETagHeader($etag) {
if (empty($etag)) {
return;
}
$etag = '"'.$etag.'"';
if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag) {
self::setStatus(self::STATUS_NOT_MODIFIED);
exit;
}
header('ETag: '.$etag);
}
/**
* Checks and set Last-Modified header, when the request matches sends a
* 'not modified' response
* @param int|DateTime|string $lastModified time when the reponse was last modified
*/
static public function setLastModifiedHeader($lastModified) {
if (empty($lastModified)) {
return;
}
if (is_int($lastModified)) {
$lastModified = gmdate(DateTime::RFC2822, $lastModified);
}
if ($lastModified instanceof DateTime) {
$lastModified = $lastModified->format(DateTime::RFC2822);
}
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
trim($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $lastModified) {
self::setStatus(self::STATUS_NOT_MODIFIED);
exit;
}
header('Last-Modified: '.$lastModified);
}
/**
* Sets the content disposition header (with possible workarounds)
* @param string $filename file name
* @param string $type disposition type, either 'attachment' or 'inline'
*/
static public function setContentDispositionHeader( $filename, $type = 'attachment' ) {
if (\OC::$server->getRequest()->isUserAgent(
[
\OC\AppFramework\Http\Request::USER_AGENT_IE,
\OC\AppFramework\Http\Request::USER_AGENT_ANDROID_MOBILE_CHROME,
\OC\AppFramework\Http\Request::USER_AGENT_FREEBOX,
])) {
header( 'Content-Disposition: ' . rawurlencode($type) . '; filename="' . rawurlencode( $filename ) . '"' );
} else {
header( 'Content-Disposition: ' . rawurlencode($type) . '; filename*=UTF-8\'\'' . rawurlencode( $filename )
. '; filename="' . rawurlencode( $filename ) . '"' );
}
}
/**
* Send file as response, checking and setting caching headers
* @param string $filepath of file to send
*/
static public function sendFile($filepath) {
$fp = fopen($filepath, 'rb');
if ($fp) {
self::setLastModifiedHeader(filemtime($filepath));
self::setETagHeader(md5_file($filepath));
header('Content-Length: '.filesize($filepath));
fpassthru($fp);
}
else {
self::setStatus(self::STATUS_NOT_FOUND);
}
}
/**
* This function adds some security related headers to all requests served via base.php
* The implementation of this function has to happen here to ensure that all third-party
* components (e.g. SabreDAV) also benefit from this headers.
*/
public static function addSecurityHeaders() {
header('X-XSS-Protection: 1; mode=block'); // Enforce browser based XSS filters
header('X-Content-Type-Options: nosniff'); // Disable sniffing the content type for IE
// iFrame Restriction Policy
$xFramePolicy = OC_Config::getValue('xframe_restriction', true);
if ($xFramePolicy) {
header('X-Frame-Options: Sameorigin'); // Disallow iFraming from other domains
}
/**
* FIXME: Content Security Policy for legacy ownCloud components. This
* can be removed once \OCP\AppFramework\Http\Response from the AppFramework
* is used everywhere.
* @see \OCP\AppFramework\Http\Response::getHeaders
*/
$policy = 'default-src \'self\'; '
. 'script-src \'self\' \'unsafe-eval\'; '
. 'style-src \'self\' \'unsafe-inline\'; '
. 'frame-src *; '
. 'img-src *; '
. 'font-src \'self\' data:; '
. 'media-src *; '
. 'connect-src *';
header('Content-Security-Policy:' . $policy);
// https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag
header('X-Robots-Tag: none');
}
}
|
