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<?php
namespace MediaWiki\Request;
use MediaWiki\Debug\MWDebug;
use MediaWiki\Http\Telemetry;
use MediaWiki\Logger\LoggerFactory;
use RuntimeException;
/**
* @since 1.29
*/
class HeaderCallback {
/** @var RuntimeException */
private static $headersSentException;
/** @var bool */
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.
*
* @since 1.29
*/
public static function register() {
// T261260 load the WebRequest class, which will be needed in callback().
// Autoloading seems unreliable in header callbacks, and in the case of a web
// request (ie. in all cases where the request might be performance-sensitive)
// it will have to be loaded at some point anyway.
// This can be removed once we require PHP 8.0+.
class_exists( WebRequest::class );
class_exists( Telemetry::class );
header_register_callback( [ __CLASS__, 'callback' ] );
}
/**
* The callback, which is called by the transport
*
* @since 1.29
*/
public static function callback() {
// Prevent caching of responses with cookies (T127993)
$headers = [];
foreach ( headers_list() as $header ) {
$header = explode( ':', $header, 2 );
// Note: The code below (currently) does not care about value-less headers
if ( isset( $header[1] ) ) {
$headers[ strtolower( trim( $header[0] ) ) ][] = trim( $header[1] );
}
}
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' );
LoggerFactory::getInstance( 'cache-cookies' )->warning(
'Cookies set on {url} with Cache-Control "{cache-control}"', [
'url' => WebRequest::getGlobalRequestURL(),
'set-cookie' => self::sanitizeSetCookie( $headers['set-cookie'] ),
'cache-control' => $cacheControl ?: '<not set>',
]
);
}
}
$telemetryHeaders = Telemetry::getInstance()->getRequestHeaders();
// Set the request ID/trace prams on the response, so edge infrastructure can log it.
// FIXME this is not an ideal place to do it, but the most reliable for now.
foreach ( $telemetryHeaders as $header => $value ) {
if ( !isset( $headers[strtolower( $header )] ) ) {
header( "$header: $value" );
}
}
// Save a backtrace for logging in case it turns out that headers were sent prematurely
self::$headersSentException = new RuntimeException( 'Headers already sent from this point' );
}
/**
* Log a warning message if headers have already been sent. This can be
* called before flushing the output.
*
* @since 1.29
*/
public static function warnIfHeadersSent() {
if ( !self::$messageSent && headers_sent( $filename, $line ) ) {
self::$messageSent = true;
MWDebug::warning( 'Headers already sent, should send headers earlier than ' .
wfGetCaller( 3 ) );
$logger = LoggerFactory::getInstance( 'headers-sent' );
$logger->error( 'Warning: headers were already sent (output started at ' . $filename . ':' . $line . ')', [
'exception' => self::$headersSentException,
'detection-trace' => new RuntimeException( 'Detected here' ),
] );
}
}
/**
* Sanitize Set-Cookie headers for logging.
* @param array $values List of header values.
* @return string
*/
public static function sanitizeSetCookie( array $values ) {
$sanitizedValues = [];
foreach ( $values as $value ) {
// Set-Cookie header format: <cookie-name>=<cookie-value>; <non-sensitive attributes>
$parts = explode( ';', $value );
[ $name, $value ] = explode( '=', $parts[0], 2 );
if ( strlen( $value ) > 8 ) {
$value = substr( $value, 0, 8 ) . '...';
$parts[0] = "$name=$value";
}
$sanitizedValues[] = implode( ';', $parts );
}
return implode( "\n", $sanitizedValues );
}
}