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
|
<?php
namespace MediaWiki;
class HeaderCallback {
private static $headersSentException;
private static $messageSent = false;
/**
* Register a callback to be called when headers are sent. There can only
* be one of these handlers active, so all relevant actions have to be in
* here.
*/
public static function register() {
header_register_callback( [ __CLASS__, 'callback' ] );
}
/**
* The callback, which is called by the transport
*/
public static function callback() {
// Prevent caching of responses with cookies (T127993)
$headers = [];
foreach ( headers_list() as $header ) {
list( $name, $value ) = explode( ':', $header, 2 );
$headers[strtolower( trim( $name ) )][] = trim( $value );
}
if ( isset( $headers['set-cookie'] ) ) {
$cacheControl = isset( $headers['cache-control'] )
? implode( ', ', $headers['cache-control'] )
: '';
if ( !preg_match( '/(?:^|,)\s*(?:private|no-cache|no-store)\s*(?:$|,)/i',
$cacheControl )
) {
header( 'Expires: Thu, 01 Jan 1970 00:00:00 GMT' );
header( 'Cache-Control: private, max-age=0, s-maxage=0' );
\MediaWiki\Logger\LoggerFactory::getInstance( 'cache-cookies' )->warning(
'Cookies set on {url} with Cache-Control "{cache-control}"', [
'url' => \WebRequest::getGlobalRequestURL(),
'cookies' => $headers['set-cookie'],
'cache-control' => $cacheControl ?: '<not set>',
]
);
}
}
// Save a backtrace for logging in case it turns out that headers were sent prematurely
self::$headersSentException = new \Exception( 'Headers already sent from this point' );
}
/**
* Log a warning message if headers have already been sent. This can be
* called before flushing the output.
*/
public static function warnIfHeadersSent() {
if ( headers_sent() && !self::$messageSent ) {
self::$messageSent = true;
\MWDebug::warning( 'Headers already sent, should send headers earlier than ' .
wfGetCaller( 3 ) );
$logger = \MediaWiki\Logger\LoggerFactory::getInstance( 'headers-sent' );
$logger->error( 'Warning: headers were already sent from the location below', [
'exception' => self::$headersSentException,
'detection-trace' => new \Exception( 'Detected here' ),
] );
}
}
}
|
