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<?php
/**
* Classes used to send headers and cookies back to the user
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
namespace MediaWiki\Request;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use RuntimeException;
use Wikimedia\Http\HttpStatus;
/**
* Allow programs to request this object from WebRequest::response()
* and handle all outputting (or lack of outputting) via it.
* @ingroup HTTP
*/
class WebResponse {
/** @var array Used to record set cookies, because PHP's setcookie() will
* happily send an identical Set-Cookie to the client.
*/
protected static $setCookies = [];
/** @var bool Used to disable setters before running jobs post-request (T191537) */
protected $disableForPostSend = false;
/**
* Disable setters for post-send processing
*
* After this call, self::setCookie(), self::header(), and
* self::statusHeader() will log a warning and return without
* setting cookies or headers.
*
* @since 1.32 (non-static since 1.42)
*/
public function disableForPostSend() {
$this->disableForPostSend = true;
}
/**
* Output an HTTP header, wrapper for PHP's header()
* @param string $string Header to output
* @param bool $replace Replace current similar header
* @param null|int $http_response_code Forces the HTTP response code to the specified value.
*/
public function header( $string, $replace = true, $http_response_code = null ) {
if ( $this->disableForPostSend ) {
wfDebugLog( 'header', 'ignored post-send header {header}', 'all', [
'header' => $string,
'replace' => $replace,
'http_response_code' => $http_response_code,
'exception' => new RuntimeException( 'Ignored post-send header' ),
] );
return;
}
\MediaWiki\Request\HeaderCallback::warnIfHeadersSent();
if ( $http_response_code ) {
header( $string, $replace, $http_response_code );
} else {
header( $string, $replace );
}
}
/**
* @see http_response_code
* @return int|bool
* @since 1.42
*/
public function getStatusCode() {
return http_response_code();
}
/**
* Get a response header
* @param string $key The name of the header to get (case insensitive).
* @return string|null The header value (if set); null otherwise.
* @since 1.25
*/
public function getHeader( $key ) {
foreach ( headers_list() as $header ) {
[ $name, $val ] = explode( ':', $header, 2 );
if ( !strcasecmp( $name, $key ) ) {
return trim( $val );
}
}
return null;
}
/**
* Output an HTTP status code header
* @since 1.26
* @param int $code Status code
*/
public function statusHeader( $code ) {
if ( $this->disableForPostSend ) {
wfDebugLog( 'header', 'ignored post-send status header {code}', 'all', [
'code' => $code,
'exception' => new RuntimeException( 'Ignored post-send status header' ),
] );
return;
}
HttpStatus::header( $code );
}
/**
* Test if headers have been sent
* @since 1.27
* @return bool
*/
public function headersSent() {
return headers_sent();
}
/**
* Set the browser cookie
*
* @param string $name The name of the cookie.
* @param string $value The value to be stored in the cookie.
* @param int|null $expire Unix timestamp (in seconds) when the cookie should expire.
* - 0 (the default) causes it to expire $wgCookieExpiration seconds from now.
* - null causes it to be a session cookie.
* @param array $options Assoc of additional cookie options:
* - prefix: string, name prefix ($wgCookiePrefix)
* - domain: string, cookie domain ($wgCookieDomain)
* - path: string, cookie path ($wgCookiePath)
* - secure: bool, secure attribute ($wgCookieSecure)
* - httpOnly: bool, httpOnly attribute ($wgCookieHttpOnly)
* - raw: bool, true to suppress encoding of the value
* - sameSite: string|null, SameSite attribute. May be "strict", "lax",
* "none", or null or "" for no attribute. (default absent)
* - sameSiteLegacy: bool|null, this option is now ignored
* @since 1.22 Replaced $prefix, $domain, and $forceSecure with $options
*/
public function setCookie( $name, $value, $expire = 0, $options = [] ) {
$services = MediaWikiServices::getInstance();
$mainConfig = $services->getMainConfig();
$cookiePath = $mainConfig->get( MainConfigNames::CookiePath );
$cookiePrefix = $mainConfig->get( MainConfigNames::CookiePrefix );
$cookieDomain = $mainConfig->get( MainConfigNames::CookieDomain );
$cookieSecure = $mainConfig->get( MainConfigNames::CookieSecure );
$cookieExpiration = $mainConfig->get( MainConfigNames::CookieExpiration );
$cookieHttpOnly = $mainConfig->get( MainConfigNames::CookieHttpOnly );
$options = array_filter( $options, static function ( $a ) {
return $a !== null;
} ) + [
'prefix' => $cookiePrefix,
'domain' => $cookieDomain,
'path' => $cookiePath,
'secure' => $cookieSecure,
'httpOnly' => $cookieHttpOnly,
'raw' => false,
'sameSite' => '',
];
if ( $expire === null ) {
$expire = 0; // Session cookie
} elseif ( $expire == 0 && $cookieExpiration != 0 ) {
$expire = time() + $cookieExpiration;
}
if ( $this->disableForPostSend ) {
$prefixedName = $options['prefix'] . $name;
wfDebugLog( 'cookie', 'ignored post-send cookie {cookie}', 'all', [
'cookie' => $prefixedName,
'data' => [
'name' => $prefixedName,
'value' => (string)$value,
'expire' => (int)$expire,
'path' => (string)$options['path'],
'domain' => (string)$options['domain'],
'secure' => (bool)$options['secure'],
'httpOnly' => (bool)$options['httpOnly'],
'sameSite' => (string)$options['sameSite']
],
'exception' => new RuntimeException( 'Ignored post-send cookie' ),
] );
return;
}
$hookRunner = new HookRunner( $services->getHookContainer() );
if ( !$hookRunner->onWebResponseSetCookie( $name, $value, $expire, $options ) ) {
return;
}
// Note: Don't try to move this earlier to reuse it for $this->disableForPostSend,
// we need to use the altered values from the hook here. (T198525)
$prefixedName = $options['prefix'] . $name;
$value = (string)$value;
$func = $options['raw'] ? 'setrawcookie' : 'setcookie';
$setOptions = [
'expires' => (int)$expire,
'path' => (string)$options['path'],
'domain' => (string)$options['domain'],
'secure' => (bool)$options['secure'],
'httponly' => (bool)$options['httpOnly'],
'samesite' => (string)$options['sameSite'],
];
// Per RFC 6265, key is name + domain + path
$key = "{$prefixedName}\n{$setOptions['domain']}\n{$setOptions['path']}";
// If this cookie name was in the request, fake an entry in
// self::$setCookies for it so the deleting check works right.
if ( isset( $_COOKIE[$prefixedName] ) && !array_key_exists( $key, self::$setCookies ) ) {
self::$setCookies[$key] = [];
}
// PHP deletes if value is the empty string; also, a past expiry is deleting
$deleting = ( $value === '' || ( $setOptions['expires'] > 0 && $setOptions['expires'] <= time() ) );
$logDesc = "$func: \"$prefixedName\", \"$value\", \"" .
implode( '", "', array_map( 'strval', $setOptions ) ) . '"';
$optionsForDeduplication = [ $func, $prefixedName, $value, $setOptions ];
if ( $deleting && !isset( self::$setCookies[$key] ) ) { // isset( null ) is false
wfDebugLog( 'cookie', "already deleted $logDesc" );
return;
} elseif ( !$deleting && isset( self::$setCookies[$key] ) &&
self::$setCookies[$key] === $optionsForDeduplication
) {
wfDebugLog( 'cookie', "already set $logDesc" );
return;
}
wfDebugLog( 'cookie', $logDesc );
if ( $func === 'setrawcookie' ) {
setrawcookie( $prefixedName, $value, $setOptions );
} else {
setcookie( $prefixedName, $value, $setOptions );
}
self::$setCookies[$key] = $deleting ? null : $optionsForDeduplication;
}
/**
* Unset a browser cookie.
* This sets the cookie with an empty value and an expiry set to a time in the past,
* which will cause the browser to remove any cookie with the given name, domain and
* path from its cookie store. Options other than these (and prefix) have no effect.
* @param string $name Cookie name
* @param array $options Cookie options, see {@link setCookie()}
* @since 1.27
*/
public function clearCookie( $name, $options = [] ) {
$this->setCookie( $name, '', time() - 31_536_000 /* 1 year */, $options );
}
/**
* Checks whether this request is performing cookie operations
*
* @return bool
* @since 1.27
*/
public function hasCookies() {
return (bool)self::$setCookies;
}
}