includes/context/RequestContext.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @since 1.18
  19  *
  20  * @author Alexandre Emsenhuber
  21  * @author Daniel Friesen
  22  * @file
  23  */
  24
  25 use Wikimedia\AtEase\AtEase;
  26 use MediaWiki\Logger\LoggerFactory;
  27 use MediaWiki\MediaWikiServices;
  28 use Wikimedia\ScopedCallback;
  29
  30 /**
  31  * Group all the pieces relevant to the context of a request into one instance
  32  */
  33 class RequestContext implements IContextSource, MutableContext {
  34         /**
  35          * @var WebRequest
  36          */
  37         private $request;
  38
  39         /**
  40          * @var Title
  41          */
  42         private $title;
  43
  44         /**
  45          * @var WikiPage
  46          */
  47         private $wikipage;
  48
  49         /**
  50          * @var OutputPage
  51          */
  52         private $output;
  53
  54         /**
  55          * @var User
  56          */
  57         private $user;
  58
  59         /**
  60          * @var Language
  61          */
  62         private $lang;
  63
  64         /**
  65          * @var Skin
  66          */
  67         private $skin;
  68
  69         /**
  70          * @var Timing
  71          */
  72         private $timing;
  73
  74         /**
  75          * @var Config
  76          */
  77         private $config;
  78
  79         /**
  80          * @var RequestContext
  81          */
  82         private static $instance = null;
  83
  84         /**
  85          * Boolean flag to guard against recursion in getLanguage
  86          * @var bool
  87          */
  88         private $languageRecursion = false;
  89
  90         /**
  91          * @param Config $config
  92          */
  93         public function setConfig( Config $config ) {
  94                 $this->config = $config;
  95         }
  96
  97         /**
  98          * @return Config
  99          */
 100         public function getConfig() {
 101                 if ( $this->config === null ) {
 102                         // @todo In the future, we could move this to WebStart.php so
 103                         // the Config object is ready for when initialization happens
 104                         $this->config = MediaWikiServices::getInstance()->getMainConfig();
 105                 }
 106
 107                 return $this->config;
 108         }
 109
 110         /**
 111          * @param WebRequest $request
 112          */
 113         public function setRequest( WebRequest $request ) {
 114                 $this->request = $request;
 115         }
 116
 117         /**
 118          * @return WebRequest
 119          */
 120         public function getRequest() {
 121                 if ( $this->request === null ) {
 122                         global $wgCommandLineMode;
 123                         // create the WebRequest object on the fly
 124                         if ( $wgCommandLineMode ) {
 125                                 $this->request = new FauxRequest( [] );
 126                         } else {
 127                                 $this->request = new WebRequest();
 128                         }
 129                 }
 130
 131                 return $this->request;
 132         }
 133
 134         /**
 135          * @deprecated since 1.27 use a StatsdDataFactory from MediaWikiServices (preferably injected)
 136          *
 137          * @return IBufferingStatsdDataFactory
 138          */
 139         public function getStats() {
 140                 return MediaWikiServices::getInstance()->getStatsdDataFactory();
 141         }
 142
 143         /**
 144          * @return Timing
 145          */
 146         public function getTiming() {
 147                 if ( $this->timing === null ) {
 148                         $this->timing = new Timing( [
 149                                 'logger' => LoggerFactory::getInstance( 'Timing' )
 150                         ] );
 151                 }
 152                 return $this->timing;
 153         }
 154
 155         /**
 156          * @param Title|null $title
 157          */
 158         public function setTitle( Title $title = null ) {
 159                 $this->title = $title;
 160                 // Erase the WikiPage so a new one with the new title gets created.
 161                 $this->wikipage = null;
 162         }
 163
 164         /**
 165          * @return Title|null
 166          */
 167         public function getTitle() {
 168                 if ( $this->title === null ) {
 169                         global $wgTitle; # fallback to $wg till we can improve this
 170                         $this->title = $wgTitle;
 171                         wfDebugLog(
 172                                 'GlobalTitleFail',
 173                                 __METHOD__ . ' called by ' . wfGetAllCallers( 5 ) . ' with no title set.'
 174                         );
 175                 }
 176
 177                 return $this->title;
 178         }
 179
 180         /**
 181          * Check, if a Title object is set
 182          *
 183          * @since 1.25
 184          * @return bool
 185          */
 186         public function hasTitle() {
 187                 return $this->title !== null;
 188         }
 189
 190         /**
 191          * Check whether a WikiPage object can be get with getWikiPage().
 192          * Callers should expect that an exception is thrown from getWikiPage()
 193          * if this method returns false.
 194          *
 195          * @since 1.19
 196          * @return bool
 197          */
 198         public function canUseWikiPage() {
 199                 if ( $this->wikipage ) {
 200                         // If there's a WikiPage object set, we can for sure get it
 201                         return true;
 202                 }
 203                 // Only pages with legitimate titles can have WikiPages.
 204                 // That usually means pages in non-virtual namespaces.
 205                 $title = $this->getTitle();
 206                 return $title ? $title->canExist() : false;
 207         }
 208
 209         /**
 210          * @since 1.19
 211          * @param WikiPage $wikiPage
 212          */
 213         public function setWikiPage( WikiPage $wikiPage ) {
 214                 $pageTitle = $wikiPage->getTitle();
 215                 if ( !$this->hasTitle() || !$pageTitle->equals( $this->getTitle() ) ) {
 216                         $this->setTitle( $pageTitle );
 217                 }
 218                 // Defer this to the end since setTitle sets it to null.
 219                 $this->wikipage = $wikiPage;
 220         }
 221
 222         /**
 223          * Get the WikiPage object.
 224          * May throw an exception if there's no Title object set or the Title object
 225          * belongs to a special namespace that doesn't have WikiPage, so use first
 226          * canUseWikiPage() to check whether this method can be called safely.
 227          *
 228          * @since 1.19
 229          * @throws MWException
 230          * @return WikiPage
 231          */
 232         public function getWikiPage() {
 233                 if ( $this->wikipage === null ) {
 234                         $title = $this->getTitle();
 235                         if ( $title === null ) {
 236                                 throw new MWException( __METHOD__ . ' called without Title object set' );
 237                         }
 238                         $this->wikipage = WikiPage::factory( $title );
 239                 }
 240
 241                 return $this->wikipage;
 242         }
 243
 244         /**
 245          * @param OutputPage $output
 246          */
 247         public function setOutput( OutputPage $output ) {
 248                 $this->output = $output;
 249         }
 250
 251         /**
 252          * @return OutputPage
 253          */
 254         public function getOutput() {
 255                 if ( $this->output === null ) {
 256                         $this->output = new OutputPage( $this );
 257                 }
 258
 259                 return $this->output;
 260         }
 261
 262         /**
 263          * @param User $user
 264          */
 265         public function setUser( User $user ) {
 266                 $this->user = $user;
 267                 // Invalidate cached user interface language
 268                 $this->lang = null;
 269         }
 270
 271         /**
 272          * @return User
 273          */
 274         public function getUser() {
 275                 if ( $this->user === null ) {
 276                         $this->user = User::newFromSession( $this->getRequest() );
 277                 }
 278
 279                 return $this->user;
 280         }
 281
 282         /**
 283          * Accepts a language code and ensures it's sane. Outputs a cleaned up language
 284          * code and replaces with $wgLanguageCode if not sane.
 285          * @param string $code Language code
 286          * @return string
 287          */
 288         public static function sanitizeLangCode( $code ) {
 289                 global $wgLanguageCode;
 290
 291                 // BCP 47 - letter case MUST NOT carry meaning
 292                 $code = strtolower( $code );
 293
 294                 # Validate $code
 295                 if ( !$code || !Language::isValidCode( $code ) || $code === 'qqq' ) {
 296                         $code = $wgLanguageCode;
 297                 }
 298
 299                 return $code;
 300         }
 301
 302         /**
 303          * @param Language|string $language Language instance or language code
 304          * @throws MWException
 305          * @since 1.19
 306          */
 307         public function setLanguage( $language ) {
 308                 if ( $language instanceof Language ) {
 309                         $this->lang = $language;
 310                 } elseif ( is_string( $language ) ) {
 311                         $language = self::sanitizeLangCode( $language );
 312                         $obj = Language::factory( $language );
 313                         $this->lang = $obj;
 314                 } else {
 315                         throw new MWException( __METHOD__ . " was passed an invalid type of data." );
 316                 }
 317         }
 318
 319         /**
 320          * Get the Language object.
 321          * Initialization of user or request objects can depend on this.
 322          * @return Language
 323          * @throws Exception
 324          * @since 1.19
 325          */
 326         public function getLanguage() {
 327                 if ( $this->languageRecursion === true ) {
 328                         trigger_error( "Recursion detected in " . __METHOD__, E_USER_WARNING );
 329                         $e = new Exception;
 330                         wfDebugLog( 'recursion-guard', "Recursion detected:\n" . $e->getTraceAsString() );
 331
 332                         $code = $this->getConfig()->get( 'LanguageCode' ) ?: 'en';
 333                         $this->lang = Language::factory( $code );
 334                 } elseif ( $this->lang === null ) {
 335                         $this->languageRecursion = true;
 336
 337                         try {
 338                                 $request = $this->getRequest();
 339                                 $user = $this->getUser();
 340
 341                                 // Optimisation: Avoid slow getVal(), this isn't user-generated content.
 342                                 $code = $request->getRawVal( 'uselang', 'user' );
 343                                 if ( $code === 'user' ) {
 344                                         $code = $user->getOption( 'language' );
 345                                 }
 346                                 $code = self::sanitizeLangCode( $code );
 347
 348                                 Hooks::run( 'UserGetLanguageObject', [ $user, &$code, $this ] );
 349
 350                                 if ( $code === $this->getConfig()->get( 'LanguageCode' ) ) {
 351                                         $this->lang = MediaWikiServices::getInstance()->getContentLanguage();
 352                                 } else {
 353                                         $obj = Language::factory( $code );
 354                                         $this->lang = $obj;
 355                                 }
 356                         } finally {
 357                                 $this->languageRecursion = false;
 358                         }
 359                 }
 360
 361                 return $this->lang;
 362         }
 363
 364         /**
 365          * @param Skin $skin
 366          */
 367         public function setSkin( Skin $skin ) {
 368                 $this->skin = clone $skin;
 369                 $this->skin->setContext( $this );
 370         }
 371
 372         /**
 373          * @return Skin
 374          */
 375         public function getSkin() {
 376                 if ( $this->skin === null ) {
 377                         $skin = null;
 378                         Hooks::run( 'RequestContextCreateSkin', [ $this, &$skin ] );
 379                         $factory = MediaWikiServices::getInstance()->getSkinFactory();
 380
 381                         if ( $skin instanceof Skin ) {
 382                                 // The hook provided a skin object
 383                                 $this->skin = $skin;
 384                         } elseif ( is_string( $skin ) ) {
 385                                 // The hook provided a skin name
 386                                 // Normalize the key, just in case the hook did something weird.
 387                                 $normalized = Skin::normalizeKey( $skin );
 388                                 $this->skin = $factory->makeSkin( $normalized );
 389                         } else {
 390                                 // No hook override, go through normal processing
 391                                 if ( !in_array( 'skin', $this->getConfig()->get( 'HiddenPrefs' ) ) ) {
 392                                         $userSkin = $this->getUser()->getOption( 'skin' );
 393                                         // Optimisation: Avoid slow getVal(), this isn't user-generated content.
 394                                         $userSkin = $this->getRequest()->getRawVal( 'useskin', $userSkin );
 395                                 } else {
 396                                         $userSkin = $this->getConfig()->get( 'DefaultSkin' );
 397                                 }
 398
 399                                 // Normalize the key in case the user is passing gibberish query params
 400                                 // or has old user preferences (T71566).
 401                                 // Skin::normalizeKey will also validate it, so makeSkin() won't throw.
 402                                 $normalized = Skin::normalizeKey( $userSkin );
 403                                 $this->skin = $factory->makeSkin( $normalized );
 404                         }
 405
 406                         // After all that set a context on whatever skin got created
 407                         $this->skin->setContext( $this );
 408                 }
 409
 410                 return $this->skin;
 411         }
 412
 413         /**
 414          * Get a Message object with context set
 415          * Parameters are the same as wfMessage()
 416          *
 417          * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
 418          *   or a MessageSpecifier.
 419          * @param mixed $args,...
 420          * @suppress PhanCommentParamWithoutRealParam HHVM bug T228695#5450847
 421          * @return Message
 422          */
 423         public function msg( $key ) {
 424                 $args = func_get_args();
 425
 426                 return wfMessage( ...$args )->setContext( $this );
 427         }
 428
 429         /**
 430          * Get the RequestContext object associated with the main request
 431          *
 432          * @return RequestContext
 433          */
 434         public static function getMain() {
 435                 if ( self::$instance === null ) {
 436                         self::$instance = new self;
 437                 }
 438
 439                 return self::$instance;
 440         }
 441
 442         /**
 443          * Get the RequestContext object associated with the main request
 444          * and gives a warning to the log, to find places, where a context maybe is missing.
 445          *
 446          * @param string $func
 447          * @return RequestContext
 448          * @since 1.24
 449          */
 450         public static function getMainAndWarn( $func = __METHOD__ ) {
 451                 wfDebug( $func . ' called without context. ' .
 452                         "Using RequestContext::getMain() for sanity\n" );
 453
 454                 return self::getMain();
 455         }
 456
 457         /**
 458          * Resets singleton returned by getMain(). Should be called only from unit tests.
 459          */
 460         public static function resetMain() {
 461                 if ( !( defined( 'MW_PHPUNIT_TEST' ) || defined( 'MW_PARSER_TEST' ) ) ) {
 462                         throw new MWException( __METHOD__ . '() should be called only from unit tests!' );
 463                 }
 464                 self::$instance = null;
 465         }
 466
 467         /**
 468          * Export the resolved user IP, HTTP headers, user ID, and session ID.
 469          * The result will be reasonably sized to allow for serialization.
 470          *
 471          * @return array
 472          * @since 1.21
 473          */
 474         public function exportSession() {
 475                 $session = MediaWiki\Session\SessionManager::getGlobalSession();
 476                 return [
 477                         'ip' => $this->getRequest()->getIP(),
 478                         'headers' => $this->getRequest()->getAllHeaders(),
 479                         'sessionId' => $session->isPersistent() ? $session->getId() : '',
 480                         'userId' => $this->getUser()->getId()
 481                 ];
 482         }
 483
 484         /**
 485          * Import an client IP address, HTTP headers, user ID, and session ID
 486          *
 487          * This sets the current session, $wgUser, and $wgRequest from $params.
 488          * Once the return value falls out of scope, the old context is restored.
 489          * This method should only be called in contexts where there is no session
 490          * ID or end user receiving the response (CLI or HTTP job runners). This
 491          * is partly enforced, and is done so to avoid leaking cookies if certain
 492          * error conditions arise.
 493          *
 494          * This is useful when background scripts inherit context when acting on
 495          * behalf of a user. In general the 'sessionId' parameter should be set
 496          * to an empty string unless session importing is *truly* needed. This
 497          * feature is somewhat deprecated.
 498          *
 499          * @note suhosin.session.encrypt may interfere with this method.
 500          *
 501          * @param array $params Result of RequestContext::exportSession()
 502          * @return ScopedCallback
 503          * @throws MWException
 504          * @since 1.21
 505          */
 506         public static function importScopedSession( array $params ) {
 507                 if ( strlen( $params['sessionId'] ) &&
 508                         MediaWiki\Session\SessionManager::getGlobalSession()->isPersistent()
 509                 ) {
 510                         // Sanity check to avoid sending random cookies for the wrong users.
 511                         // This method should only called by CLI scripts or by HTTP job runners.
 512                         throw new MWException( "Sessions can only be imported when none is active." );
 513                 } elseif ( !IP::isValid( $params['ip'] ) ) {
 514                         throw new MWException( "Invalid client IP address '{$params['ip']}'." );
 515                 }
 516
 517                 if ( $params['userId'] ) { // logged-in user
 518                         $user = User::newFromId( $params['userId'] );
 519                         $user->load();
 520                         if ( !$user->getId() ) {
 521                                 throw new MWException( "No user with ID '{$params['userId']}'." );
 522                         }
 523                 } else { // anon user
 524                         $user = User::newFromName( $params['ip'], false );
 525                 }
 526
 527                 $importSessionFunc = function ( User $user, array $params ) {
 528                         global $wgRequest, $wgUser;
 529
 530                         $context = RequestContext::getMain();
 531
 532                         // Commit and close any current session
 533                         if ( MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
 534                                 session_write_close(); // persist
 535                                 session_id( '' ); // detach
 536                                 $_SESSION = []; // clear in-memory array
 537                         }
 538
 539                         // Get new session, if applicable
 540                         $session = null;
 541                         if ( strlen( $params['sessionId'] ) ) { // don't make a new random ID
 542                                 $manager = MediaWiki\Session\SessionManager::singleton();
 543                                 $session = $manager->getSessionById( $params['sessionId'], true )
 544                                         ?: $manager->getEmptySession();
 545                         }
 546
 547                         // Remove any user IP or agent information, and attach the request
 548                         // with the new session.
 549                         $context->setRequest( new FauxRequest( [], false, $session ) );
 550                         $wgRequest = $context->getRequest(); // b/c
 551
 552                         // Now that all private information is detached from the user, it should
 553                         // be safe to load the new user. If errors occur or an exception is thrown
 554                         // and caught (leaving the main context in a mixed state), there is no risk
 555                         // of the User object being attached to the wrong IP, headers, or session.
 556                         $context->setUser( $user );
 557                         $wgUser = $context->getUser(); // b/c
 558                         if ( $session && MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
 559                                 session_id( $session->getId() );
 560                                 AtEase::quietCall( 'session_start' );
 561                         }
 562                         $request = new FauxRequest( [], false, $session );
 563                         $request->setIP( $params['ip'] );
 564                         foreach ( $params['headers'] as $name => $value ) {
 565                                 $request->setHeader( $name, $value );
 566                         }
 567                         // Set the current context to use the new WebRequest
 568                         $context->setRequest( $request );
 569                         $wgRequest = $context->getRequest(); // b/c
 570                 };
 571
 572                 // Stash the old session and load in the new one
 573                 $oUser = self::getMain()->getUser();
 574                 $oParams = self::getMain()->exportSession();
 575                 $oRequest = self::getMain()->getRequest();
 576                 $importSessionFunc( $user, $params );
 577
 578                 // Set callback to save and close the new session and reload the old one
 579                 return new ScopedCallback(
 580                         function () use ( $importSessionFunc, $oUser, $oParams, $oRequest ) {
 581                                 global $wgRequest;
 582                                 $importSessionFunc( $oUser, $oParams );
 583                                 // Restore the exact previous Request object (instead of leaving FauxRequest)
 584                                 RequestContext::getMain()->setRequest( $oRequest );
 585                                 $wgRequest = RequestContext::getMain()->getRequest(); // b/c
 586                         }
 587                 );
 588         }
 589
 590         /**
 591          * Create a new extraneous context. The context is filled with information
 592          * external to the current session.
 593          * - Title is specified by argument
 594          * - Request is a FauxRequest, or a FauxRequest can be specified by argument
 595          * - User is an anonymous user, for separation IPv4 localhost is used
 596          * - Language will be based on the anonymous user and request, may be content
 597          *   language or a uselang param in the fauxrequest data may change the lang
 598          * - Skin will be based on the anonymous user, should be the wiki's default skin
 599          *
 600          * @param Title $title Title to use for the extraneous request
 601          * @param WebRequest|array $request A WebRequest or data to use for a FauxRequest
 602          * @return RequestContext
 603          */
 604         public static function newExtraneousContext( Title $title, $request = [] ) {
 605                 $context = new self;
 606                 $context->setTitle( $title );
 607                 if ( $request instanceof WebRequest ) {
 608                         $context->setRequest( $request );
 609                 } else {
 610                         $context->setRequest( new FauxRequest( $request ) );
 611                 }
 612                 $context->user = User::newFromName( '127.0.0.1', false );
 613
 614                 return $context;
 615         }
 616 }