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<?php
/**
* 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
*
* @since 1.18
*
* @author Alexandre Emsenhuber
* @author Daniel Friesen
* @file
*/
use Liuggio\StatsdClient\Factory\StatsdDataFactory;
use MediaWiki\Logger\LoggerFactory;
use MediaWiki\MediaWikiServices;
/**
* Group all the pieces relevant to the context of a request into one instance
*/
class RequestContext implements IContextSource, MutableContext {
/**
* @var WebRequest
*/
private $request;
/**
* @var Title
*/
private $title;
/**
* @var WikiPage
*/
private $wikipage;
/**
* @var OutputPage
*/
private $output;
/**
* @var User
*/
private $user;
/**
* @var Language
*/
private $lang;
/**
* @var Skin
*/
private $skin;
/**
* @var Timing
*/
private $timing;
/**
* @var Config
*/
private $config;
/**
* @var RequestContext
*/
private static $instance = null;
/**
* Set the Config object
*
* @param Config $c
*/
public function setConfig( Config $c ) {
$this->config = $c;
}
/**
* Get the Config object
*
* @return Config
*/
public function getConfig() {
if ( $this->config === null ) {
// @todo In the future, we could move this to WebStart.php so
// the Config object is ready for when initialization happens
$this->config = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
}
return $this->config;
}
/**
* Set the WebRequest object
*
* @param WebRequest $r
*/
public function setRequest( WebRequest $r ) {
$this->request = $r;
}
/**
* Get the WebRequest object
*
* @return WebRequest
*/
public function getRequest() {
if ( $this->request === null ) {
global $wgCommandLineMode;
// create the WebRequest object on the fly
if ( $wgCommandLineMode ) {
$this->request = new FauxRequest( [] );
} else {
$this->request = new WebRequest();
}
}
return $this->request;
}
/**
* Get the Stats object
*
* @deprecated since 1.27 use a StatsdDataFactory from MediaWikiServices (preferably injected)
*
* @return StatsdDataFactory
*/
public function getStats() {
return MediaWikiServices::getInstance()->getStatsdDataFactory();
}
/**
* Get the timing object
*
* @return Timing
*/
public function getTiming() {
if ( $this->timing === null ) {
$this->timing = new Timing( [
'logger' => LoggerFactory::getInstance( 'Timing' )
] );
}
return $this->timing;
}
/**
* Set the Title object
*
* @param Title $title
*/
public function setTitle( Title $title = null ) {
$this->title = $title;
// Erase the WikiPage so a new one with the new title gets created.
$this->wikipage = null;
}
/**
* Get the Title object
*
* @return Title|null
*/
public function getTitle() {
if ( $this->title === null ) {
global $wgTitle; # fallback to $wg till we can improve this
$this->title = $wgTitle;
wfDebugLog(
'GlobalTitleFail',
__METHOD__ . ' called by ' . wfGetAllCallers( 5 ) . ' with no title set.'
);
}
return $this->title;
}
/**
* Check, if a Title object is set
*
* @since 1.25
* @return bool
*/
public function hasTitle() {
return $this->title !== null;
}
/**
* Check whether a WikiPage object can be get with getWikiPage().
* Callers should expect that an exception is thrown from getWikiPage()
* if this method returns false.
*
* @since 1.19
* @return bool
*/
public function canUseWikiPage() {
if ( $this->wikipage ) {
// If there's a WikiPage object set, we can for sure get it
return true;
}
// Only pages with legitimate titles can have WikiPages.
// That usually means pages in non-virtual namespaces.
$title = $this->getTitle();
return $title ? $title->canExist() : false;
}
/**
* Set the WikiPage object
*
* @since 1.19
* @param WikiPage $p
*/
public function setWikiPage( WikiPage $p ) {
$pageTitle = $p->getTitle();
if ( !$this->hasTitle() || !$pageTitle->equals( $this->getTitle() ) ) {
$this->setTitle( $pageTitle );
}
// Defer this to the end since setTitle sets it to null.
$this->wikipage = $p;
}
/**
* Get the WikiPage object.
* May throw an exception if there's no Title object set or the Title object
* belongs to a special namespace that doesn't have WikiPage, so use first
* canUseWikiPage() to check whether this method can be called safely.
*
* @since 1.19
* @throws MWException
* @return WikiPage
*/
public function getWikiPage() {
if ( $this->wikipage === null ) {
$title = $this->getTitle();
if ( $title === null ) {
throw new MWException( __METHOD__ . ' called without Title object set' );
}
$this->wikipage = WikiPage::factory( $title );
}
return $this->wikipage;
}
/**
* @param OutputPage $o
*/
public function setOutput( OutputPage $o ) {
$this->output = $o;
}
/**
* Get the OutputPage object
*
* @return OutputPage
*/
public function getOutput() {
if ( $this->output === null ) {
$this->output = new OutputPage( $this );
}
return $this->output;
}
/**
* Set the User object
*
* @param User $u
*/
public function setUser( User $u ) {
$this->user = $u;
}
/**
* Get the User object
*
* @return User
*/
public function getUser() {
if ( $this->user === null ) {
$this->user = User::newFromSession( $this->getRequest() );
}
return $this->user;
}
/**
* Accepts a language code and ensures it's sane. Outputs a cleaned up language
* code and replaces with $wgLanguageCode if not sane.
* @param string $code Language code
* @return string
*/
public static function sanitizeLangCode( $code ) {
global $wgLanguageCode;
// BCP 47 - letter case MUST NOT carry meaning
$code = strtolower( $code );
# Validate $code
if ( !$code || !Language::isValidCode( $code ) || $code === 'qqq' ) {
wfDebug( "Invalid user language code\n" );
$code = $wgLanguageCode;
}
return $code;
}
/**
* Set the Language object
*
* @param Language|string $l Language instance or language code
* @throws MWException
* @since 1.19
*/
public function setLanguage( $l ) {
if ( $l instanceof Language ) {
$this->lang = $l;
} elseif ( is_string( $l ) ) {
$l = self::sanitizeLangCode( $l );
$obj = Language::factory( $l );
$this->lang = $obj;
} else {
throw new MWException( __METHOD__ . " was passed an invalid type of data." );
}
}
/**
* Get the Language object.
* Initialization of user or request objects can depend on this.
* @return Language
* @throws Exception
* @since 1.19
*/
public function getLanguage() {
if ( isset( $this->recursion ) ) {
trigger_error( "Recursion detected in " . __METHOD__, E_USER_WARNING );
$e = new Exception;
wfDebugLog( 'recursion-guard', "Recursion detected:\n" . $e->getTraceAsString() );
$code = $this->getConfig()->get( 'LanguageCode' ) ?: 'en';
$this->lang = Language::factory( $code );
} elseif ( $this->lang === null ) {
$this->recursion = true;
global $wgContLang;
try {
$request = $this->getRequest();
$user = $this->getUser();
$code = $request->getVal( 'uselang', 'user' );
if ( $code === 'user' ) {
$code = $user->getOption( 'language' );
}
$code = self::sanitizeLangCode( $code );
Hooks::run( 'UserGetLanguageObject', [ $user, &$code, $this ] );
if ( $code === $this->getConfig()->get( 'LanguageCode' ) ) {
$this->lang = $wgContLang;
} else {
$obj = Language::factory( $code );
$this->lang = $obj;
}
unset( $this->recursion );
}
catch ( Exception $ex ) {
unset( $this->recursion );
throw $ex;
}
}
return $this->lang;
}
/**
* Set the Skin object
*
* @param Skin $s
*/
public function setSkin( Skin $s ) {
$this->skin = clone $s;
$this->skin->setContext( $this );
}
/**
* Get the Skin object
*
* @return Skin
*/
public function getSkin() {
if ( $this->skin === null ) {
$skin = null;
Hooks::run( 'RequestContextCreateSkin', [ $this, &$skin ] );
$factory = SkinFactory::getDefaultInstance();
// If the hook worked try to set a skin from it
if ( $skin instanceof Skin ) {
$this->skin = $skin;
} elseif ( is_string( $skin ) ) {
// Normalize the key, just in case the hook did something weird.
$normalized = Skin::normalizeKey( $skin );
$this->skin = $factory->makeSkin( $normalized );
}
// If this is still null (the hook didn't run or didn't work)
// then go through the normal processing to load a skin
if ( $this->skin === null ) {
if ( !in_array( 'skin', $this->getConfig()->get( 'HiddenPrefs' ) ) ) {
# get the user skin
$userSkin = $this->getUser()->getOption( 'skin' );
$userSkin = $this->getRequest()->getVal( 'useskin', $userSkin );
} else {
# if we're not allowing users to override, then use the default
$userSkin = $this->getConfig()->get( 'DefaultSkin' );
}
// Normalize the key in case the user is passing gibberish
// or has old preferences (bug 69566).
$normalized = Skin::normalizeKey( $userSkin );
// Skin::normalizeKey will also validate it, so
// this won't throw an exception
$this->skin = $factory->makeSkin( $normalized );
}
// After all that set a context on whatever skin got created
$this->skin->setContext( $this );
}
return $this->skin;
}
/** Helpful methods **/
/**
* Get a Message object with context set
* Parameters are the same as wfMessage()
*
* @param mixed ...
* @return Message
*/
public function msg() {
$args = func_get_args();
return call_user_func_array( 'wfMessage', $args )->setContext( $this );
}
/** Static methods **/
/**
* Get the RequestContext object associated with the main request
*
* @return RequestContext
*/
public static function getMain() {
if ( self::$instance === null ) {
self::$instance = new self;
}
return self::$instance;
}
/**
* Get the RequestContext object associated with the main request
* and gives a warning to the log, to find places, where a context maybe is missing.
*
* @param string $func
* @return RequestContext
* @since 1.24
*/
public static function getMainAndWarn( $func = __METHOD__ ) {
wfDebug( $func . ' called without context. ' .
"Using RequestContext::getMain() for sanity\n" );
return self::getMain();
}
/**
* Resets singleton returned by getMain(). Should be called only from unit tests.
*/
public static function resetMain() {
if ( !( defined( 'MW_PHPUNIT_TEST' ) || defined( 'MW_PARSER_TEST' ) ) ) {
throw new MWException( __METHOD__ . '() should be called only from unit tests!' );
}
self::$instance = null;
}
/**
* Export the resolved user IP, HTTP headers, user ID, and session ID.
* The result will be reasonably sized to allow for serialization.
*
* @return array
* @since 1.21
*/
public function exportSession() {
$session = MediaWiki\Session\SessionManager::getGlobalSession();
return [
'ip' => $this->getRequest()->getIP(),
'headers' => $this->getRequest()->getAllHeaders(),
'sessionId' => $session->isPersistent() ? $session->getId() : '',
'userId' => $this->getUser()->getId()
];
}
/**
* Import an client IP address, HTTP headers, user ID, and session ID
*
* This sets the current session, $wgUser, and $wgRequest from $params.
* Once the return value falls out of scope, the old context is restored.
* This method should only be called in contexts where there is no session
* ID or end user receiving the response (CLI or HTTP job runners). This
* is partly enforced, and is done so to avoid leaking cookies if certain
* error conditions arise.
*
* This is useful when background scripts inherit context when acting on
* behalf of a user. In general the 'sessionId' parameter should be set
* to an empty string unless session importing is *truly* needed. This
* feature is somewhat deprecated.
*
* @note suhosin.session.encrypt may interfere with this method.
*
* @param array $params Result of RequestContext::exportSession()
* @return ScopedCallback
* @throws MWException
* @since 1.21
*/
public static function importScopedSession( array $params ) {
if ( strlen( $params['sessionId'] ) &&
MediaWiki\Session\SessionManager::getGlobalSession()->isPersistent()
) {
// Sanity check to avoid sending random cookies for the wrong users.
// This method should only called by CLI scripts or by HTTP job runners.
throw new MWException( "Sessions can only be imported when none is active." );
} elseif ( !IP::isValid( $params['ip'] ) ) {
throw new MWException( "Invalid client IP address '{$params['ip']}'." );
}
if ( $params['userId'] ) { // logged-in user
$user = User::newFromId( $params['userId'] );
$user->load();
if ( !$user->getId() ) {
throw new MWException( "No user with ID '{$params['userId']}'." );
}
} else { // anon user
$user = User::newFromName( $params['ip'], false );
}
$importSessionFunc = function ( User $user, array $params ) {
global $wgRequest, $wgUser;
$context = RequestContext::getMain();
// Commit and close any current session
if ( MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
session_write_close(); // persist
session_id( '' ); // detach
$_SESSION = []; // clear in-memory array
}
// Get new session, if applicable
$session = null;
if ( strlen( $params['sessionId'] ) ) { // don't make a new random ID
$manager = MediaWiki\Session\SessionManager::singleton();
$session = $manager->getSessionById( $params['sessionId'], true )
?: $manager->getEmptySession();
}
// Remove any user IP or agent information, and attach the request
// with the new session.
$context->setRequest( new FauxRequest( [], false, $session ) );
$wgRequest = $context->getRequest(); // b/c
// Now that all private information is detached from the user, it should
// be safe to load the new user. If errors occur or an exception is thrown
// and caught (leaving the main context in a mixed state), there is no risk
// of the User object being attached to the wrong IP, headers, or session.
$context->setUser( $user );
$wgUser = $context->getUser(); // b/c
if ( $session && MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
session_id( $session->getId() );
MediaWiki\quietCall( 'session_start' );
}
$request = new FauxRequest( [], false, $session );
$request->setIP( $params['ip'] );
foreach ( $params['headers'] as $name => $value ) {
$request->setHeader( $name, $value );
}
// Set the current context to use the new WebRequest
$context->setRequest( $request );
$wgRequest = $context->getRequest(); // b/c
};
// Stash the old session and load in the new one
$oUser = self::getMain()->getUser();
$oParams = self::getMain()->exportSession();
$oRequest = self::getMain()->getRequest();
$importSessionFunc( $user, $params );
// Set callback to save and close the new session and reload the old one
return new ScopedCallback(
function () use ( $importSessionFunc, $oUser, $oParams, $oRequest ) {
global $wgRequest;
$importSessionFunc( $oUser, $oParams );
// Restore the exact previous Request object (instead of leaving FauxRequest)
RequestContext::getMain()->setRequest( $oRequest );
$wgRequest = RequestContext::getMain()->getRequest(); // b/c
}
);
}
/**
* Create a new extraneous context. The context is filled with information
* external to the current session.
* - Title is specified by argument
* - Request is a FauxRequest, or a FauxRequest can be specified by argument
* - User is an anonymous user, for separation IPv4 localhost is used
* - Language will be based on the anonymous user and request, may be content
* language or a uselang param in the fauxrequest data may change the lang
* - Skin will be based on the anonymous user, should be the wiki's default skin
*
* @param Title $title Title to use for the extraneous request
* @param WebRequest|array $request A WebRequest or data to use for a FauxRequest
* @return RequestContext
*/
public static function newExtraneousContext( Title $title, $request = [] ) {
$context = new self;
$context->setTitle( $title );
if ( $request instanceof WebRequest ) {
$context->setRequest( $request );
} else {
$context->setRequest( new FauxRequest( $request ) );
}
$context->user = User::newFromName( '127.0.0.1', false );
return $context;
}
}