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 MediaWiki\Logger\LoggerFactory;
  26
  27 /**
  28  * Group all the pieces relevant to the context of a request into one instance
  29  */
  30 class RequestContext implements IContextSource, MutableContext {
  31         /**
  32          * @var WebRequest
  33          */
  34         private $request;
  35
  36         /**
  37          * @var Title
  38          */
  39         private $title;
  40
  41         /**
  42          * @var WikiPage
  43          */
  44         private $wikipage;
  45
  46         /**
  47          * @var OutputPage
  48          */
  49         private $output;
  50
  51         /**
  52          * @var User
  53          */
  54         private $user;
  55
  56         /**
  57          * @var Language
  58          */
  59         private $lang;
  60
  61         /**
  62          * @var Skin
  63          */
  64         private $skin;
  65
  66         /**
  67          * @var \Liuggio\StatsdClient\Factory\StatsdDataFactory
  68          */
  69         private $stats;
  70
  71         /**
  72          * @var Timing
  73          */
  74         private $timing;
  75
  76         /**
  77          * @var Config
  78          */
  79         private $config;
  80
  81         /**
  82          * @var RequestContext
  83          */
  84         private static $instance = null;
  85
  86         /**
  87          * Set the Config object
  88          *
  89          * @param Config $c
  90          */
  91         public function setConfig( Config $c ) {
  92                 $this->config = $c;
  93         }
  94
  95         /**
  96          * Get the Config object
  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 = ConfigFactory::getDefaultInstance()->makeConfig( 'main' );
 105                 }
 106
 107                 return $this->config;
 108         }
 109
 110         /**
 111          * Set the WebRequest object
 112          *
 113          * @param WebRequest $r
 114          */
 115         public function setRequest( WebRequest $r ) {
 116                 $this->request = $r;
 117         }
 118
 119         /**
 120          * Get the WebRequest object
 121          *
 122          * @return WebRequest
 123          */
 124         public function getRequest() {
 125                 if ( $this->request === null ) {
 126                         global $wgCommandLineMode;
 127                         // create the WebRequest object on the fly
 128                         if ( $wgCommandLineMode ) {
 129                                 $this->request = new FauxRequest( [] );
 130                         } else {
 131                                 $this->request = new WebRequest();
 132                         }
 133                 }
 134
 135                 return $this->request;
 136         }
 137
 138         /**
 139          * Get the Stats object
 140          *
 141          * @return BufferingStatsdDataFactory
 142          */
 143         public function getStats() {
 144                 if ( $this->stats === null ) {
 145                         $prefix = rtrim( $this->getConfig()->get( 'StatsdMetricPrefix' ), '.' );
 146                         $this->stats = new BufferingStatsdDataFactory( $prefix );
 147                 }
 148                 return $this->stats;
 149         }
 150
 151         /**
 152          * Get the timing object
 153          *
 154          * @return Timing
 155          */
 156         public function getTiming() {
 157                 if ( $this->timing === null ) {
 158                         $this->timing = new Timing( [
 159                                 'logger' => LoggerFactory::getInstance( 'Timing' )
 160                         ] );
 161                 }
 162                 return $this->timing;
 163         }
 164
 165         /**
 166          * Set the Title object
 167          *
 168          * @param Title $title
 169          */
 170         public function setTitle( Title $title = null ) {
 171                 $this->title = $title;
 172                 // Erase the WikiPage so a new one with the new title gets created.
 173                 $this->wikipage = null;
 174         }
 175
 176         /**
 177          * Get the Title object
 178          *
 179          * @return Title|null
 180          */
 181         public function getTitle() {
 182                 if ( $this->title === null ) {
 183                         global $wgTitle; # fallback to $wg till we can improve this
 184                         $this->title = $wgTitle;
 185                         wfDebugLog(
 186                                 'GlobalTitleFail',
 187                                 __METHOD__ . ' called by ' . wfGetAllCallers( 5 ) . ' with no title set.'
 188                         );
 189                 }
 190
 191                 return $this->title;
 192         }
 193
 194         /**
 195          * Check, if a Title object is set
 196          *
 197          * @since 1.25
 198          * @return bool
 199          */
 200         public function hasTitle() {
 201                 return $this->title !== null;
 202         }
 203
 204         /**
 205          * Check whether a WikiPage object can be get with getWikiPage().
 206          * Callers should expect that an exception is thrown from getWikiPage()
 207          * if this method returns false.
 208          *
 209          * @since 1.19
 210          * @return bool
 211          */
 212         public function canUseWikiPage() {
 213                 if ( $this->wikipage ) {
 214                         // If there's a WikiPage object set, we can for sure get it
 215                         return true;
 216                 }
 217                 // Only pages with legitimate titles can have WikiPages.
 218                 // That usually means pages in non-virtual namespaces.
 219                 $title = $this->getTitle();
 220                 return $title ? $title->canExist() : false;
 221         }
 222
 223         /**
 224          * Set the WikiPage object
 225          *
 226          * @since 1.19
 227          * @param WikiPage $p
 228          */
 229         public function setWikiPage( WikiPage $p ) {
 230                 $pageTitle = $p->getTitle();
 231                 if ( !$this->hasTitle() || !$pageTitle->equals( $this->getTitle() ) ) {
 232                         $this->setTitle( $pageTitle );
 233                 }
 234                 // Defer this to the end since setTitle sets it to null.
 235                 $this->wikipage = $p;
 236         }
 237
 238         /**
 239          * Get the WikiPage object.
 240          * May throw an exception if there's no Title object set or the Title object
 241          * belongs to a special namespace that doesn't have WikiPage, so use first
 242          * canUseWikiPage() to check whether this method can be called safely.
 243          *
 244          * @since 1.19
 245          * @throws MWException
 246          * @return WikiPage
 247          */
 248         public function getWikiPage() {
 249                 if ( $this->wikipage === null ) {
 250                         $title = $this->getTitle();
 251                         if ( $title === null ) {
 252                                 throw new MWException( __METHOD__ . ' called without Title object set' );
 253                         }
 254                         $this->wikipage = WikiPage::factory( $title );
 255                 }
 256
 257                 return $this->wikipage;
 258         }
 259
 260         /**
 261          * @param OutputPage $o
 262          */
 263         public function setOutput( OutputPage $o ) {
 264                 $this->output = $o;
 265         }
 266
 267         /**
 268          * Get the OutputPage object
 269          *
 270          * @return OutputPage
 271          */
 272         public function getOutput() {
 273                 if ( $this->output === null ) {
 274                         $this->output = new OutputPage( $this );
 275                 }
 276
 277                 return $this->output;
 278         }
 279
 280         /**
 281          * Set the User object
 282          *
 283          * @param User $u
 284          */
 285         public function setUser( User $u ) {
 286                 $this->user = $u;
 287         }
 288
 289         /**
 290          * Get the User object
 291          *
 292          * @return User
 293          */
 294         public function getUser() {
 295                 if ( $this->user === null ) {
 296                         $this->user = User::newFromSession( $this->getRequest() );
 297                 }
 298
 299                 return $this->user;
 300         }
 301
 302         /**
 303          * Accepts a language code and ensures it's sane. Outputs a cleaned up language
 304          * code and replaces with $wgLanguageCode if not sane.
 305          * @param string $code Language code
 306          * @return string
 307          */
 308         public static function sanitizeLangCode( $code ) {
 309                 global $wgLanguageCode;
 310
 311                 // BCP 47 - letter case MUST NOT carry meaning
 312                 $code = strtolower( $code );
 313
 314                 # Validate $code
 315                 if ( !$code || !Language::isValidCode( $code ) || $code === 'qqq' ) {
 316                         wfDebug( "Invalid user language code\n" );
 317                         $code = $wgLanguageCode;
 318                 }
 319
 320                 return $code;
 321         }
 322
 323         /**
 324          * Set the Language object
 325          *
 326          * @param Language|string $l Language instance or language code
 327          * @throws MWException
 328          * @since 1.19
 329          */
 330         public function setLanguage( $l ) {
 331                 if ( $l instanceof Language ) {
 332                         $this->lang = $l;
 333                 } elseif ( is_string( $l ) ) {
 334                         $l = self::sanitizeLangCode( $l );
 335                         $obj = Language::factory( $l );
 336                         $this->lang = $obj;
 337                 } else {
 338                         throw new MWException( __METHOD__ . " was passed an invalid type of data." );
 339                 }
 340         }
 341
 342         /**
 343          * Get the Language object.
 344          * Initialization of user or request objects can depend on this.
 345          * @return Language
 346          * @throws Exception
 347          * @since 1.19
 348          */
 349         public function getLanguage() {
 350                 if ( isset( $this->recursion ) ) {
 351                         trigger_error( "Recursion detected in " . __METHOD__, E_USER_WARNING );
 352                         $e = new Exception;
 353                         wfDebugLog( 'recursion-guard', "Recursion detected:\n" . $e->getTraceAsString() );
 354
 355                         $code = $this->getConfig()->get( 'LanguageCode' ) ?: 'en';
 356                         $this->lang = Language::factory( $code );
 357                 } elseif ( $this->lang === null ) {
 358                         $this->recursion = true;
 359
 360                         global $wgContLang;
 361
 362                         try {
 363                                 $request = $this->getRequest();
 364                                 $user = $this->getUser();
 365
 366                                 $code = $request->getVal( 'uselang', 'user' );
 367                                 if ( $code === 'user' ) {
 368                                         $code = $user->getOption( 'language' );
 369                                 }
 370                                 $code = self::sanitizeLangCode( $code );
 371
 372                                 Hooks::run( 'UserGetLanguageObject', [ $user, &$code, $this ] );
 373
 374                                 if ( $code === $this->getConfig()->get( 'LanguageCode' ) ) {
 375                                         $this->lang = $wgContLang;
 376                                 } else {
 377                                         $obj = Language::factory( $code );
 378                                         $this->lang = $obj;
 379                                 }
 380
 381                                 unset( $this->recursion );
 382                         }
 383                         catch ( Exception $ex ) {
 384                                 unset( $this->recursion );
 385                                 throw $ex;
 386                         }
 387                 }
 388
 389                 return $this->lang;
 390         }
 391
 392         /**
 393          * Set the Skin object
 394          *
 395          * @param Skin $s
 396          */
 397         public function setSkin( Skin $s ) {
 398                 $this->skin = clone $s;
 399                 $this->skin->setContext( $this );
 400         }
 401
 402         /**
 403          * Get the Skin object
 404          *
 405          * @return Skin
 406          */
 407         public function getSkin() {
 408                 if ( $this->skin === null ) {
 409                         $skin = null;
 410                         Hooks::run( 'RequestContextCreateSkin', [ $this, &$skin ] );
 411                         $factory = SkinFactory::getDefaultInstance();
 412
 413                         // If the hook worked try to set a skin from it
 414                         if ( $skin instanceof Skin ) {
 415                                 $this->skin = $skin;
 416                         } elseif ( is_string( $skin ) ) {
 417                                 // Normalize the key, just in case the hook did something weird.
 418                                 $normalized = Skin::normalizeKey( $skin );
 419                                 $this->skin = $factory->makeSkin( $normalized );
 420                         }
 421
 422                         // If this is still null (the hook didn't run or didn't work)
 423                         // then go through the normal processing to load a skin
 424                         if ( $this->skin === null ) {
 425                                 if ( !in_array( 'skin', $this->getConfig()->get( 'HiddenPrefs' ) ) ) {
 426                                         # get the user skin
 427                                         $userSkin = $this->getUser()->getOption( 'skin' );
 428                                         $userSkin = $this->getRequest()->getVal( 'useskin', $userSkin );
 429                                 } else {
 430                                         # if we're not allowing users to override, then use the default
 431                                         $userSkin = $this->getConfig()->get( 'DefaultSkin' );
 432                                 }
 433
 434                                 // Normalize the key in case the user is passing gibberish
 435                                 // or has old preferences (bug 69566).
 436                                 $normalized = Skin::normalizeKey( $userSkin );
 437
 438                                 // Skin::normalizeKey will also validate it, so
 439                                 // this won't throw an exception
 440                                 $this->skin = $factory->makeSkin( $normalized );
 441                         }
 442
 443                         // After all that set a context on whatever skin got created
 444                         $this->skin->setContext( $this );
 445                 }
 446
 447                 return $this->skin;
 448         }
 449
 450         /** Helpful methods **/
 451
 452         /**
 453          * Get a Message object with context set
 454          * Parameters are the same as wfMessage()
 455          *
 456          * @param mixed ...
 457          * @return Message
 458          */
 459         public function msg() {
 460                 $args = func_get_args();
 461
 462                 return call_user_func_array( 'wfMessage', $args )->setContext( $this );
 463         }
 464
 465         /** Static methods **/
 466
 467         /**
 468          * Get the RequestContext object associated with the main request
 469          *
 470          * @return RequestContext
 471          */
 472         public static function getMain() {
 473                 if ( self::$instance === null ) {
 474                         self::$instance = new self;
 475                 }
 476
 477                 return self::$instance;
 478         }
 479
 480         /**
 481          * Get the RequestContext object associated with the main request
 482          * and gives a warning to the log, to find places, where a context maybe is missing.
 483          *
 484          * @param string $func
 485          * @return RequestContext
 486          * @since 1.24
 487          */
 488         public static function getMainAndWarn( $func = __METHOD__ ) {
 489                 wfDebug( $func . ' called without context. ' .
 490                         "Using RequestContext::getMain() for sanity\n" );
 491
 492                 return self::getMain();
 493         }
 494
 495         /**
 496          * Resets singleton returned by getMain(). Should be called only from unit tests.
 497          */
 498         public static function resetMain() {
 499                 if ( !( defined( 'MW_PHPUNIT_TEST' ) || defined( 'MW_PARSER_TEST' ) ) ) {
 500                         throw new MWException( __METHOD__ . '() should be called only from unit tests!' );
 501                 }
 502                 self::$instance = null;
 503         }
 504
 505         /**
 506          * Export the resolved user IP, HTTP headers, user ID, and session ID.
 507          * The result will be reasonably sized to allow for serialization.
 508          *
 509          * @return array
 510          * @since 1.21
 511          */
 512         public function exportSession() {
 513                 $session = MediaWiki\Session\SessionManager::getGlobalSession();
 514                 return [
 515                         'ip' => $this->getRequest()->getIP(),
 516                         'headers' => $this->getRequest()->getAllHeaders(),
 517                         'sessionId' => $session->isPersistent() ? $session->getId() : '',
 518                         'userId' => $this->getUser()->getId()
 519                 ];
 520         }
 521
 522         /**
 523          * Import an client IP address, HTTP headers, user ID, and session ID
 524          *
 525          * This sets the current session, $wgUser, and $wgRequest from $params.
 526          * Once the return value falls out of scope, the old context is restored.
 527          * This method should only be called in contexts where there is no session
 528          * ID or end user receiving the response (CLI or HTTP job runners). This
 529          * is partly enforced, and is done so to avoid leaking cookies if certain
 530          * error conditions arise.
 531          *
 532          * This is useful when background scripts inherit context when acting on
 533          * behalf of a user. In general the 'sessionId' parameter should be set
 534          * to an empty string unless session importing is *truly* needed. This
 535          * feature is somewhat deprecated.
 536          *
 537          * @note suhosin.session.encrypt may interfere with this method.
 538          *
 539          * @param array $params Result of RequestContext::exportSession()
 540          * @return ScopedCallback
 541          * @throws MWException
 542          * @since 1.21
 543          */
 544         public static function importScopedSession( array $params ) {
 545                 if ( strlen( $params['sessionId'] ) &&
 546                         MediaWiki\Session\SessionManager::getGlobalSession()->isPersistent()
 547                 ) {
 548                         // Sanity check to avoid sending random cookies for the wrong users.
 549                         // This method should only called by CLI scripts or by HTTP job runners.
 550                         throw new MWException( "Sessions can only be imported when none is active." );
 551                 } elseif ( !IP::isValid( $params['ip'] ) ) {
 552                         throw new MWException( "Invalid client IP address '{$params['ip']}'." );
 553                 }
 554
 555                 if ( $params['userId'] ) { // logged-in user
 556                         $user = User::newFromId( $params['userId'] );
 557                         $user->load();
 558                         if ( !$user->getId() ) {
 559                                 throw new MWException( "No user with ID '{$params['userId']}'." );
 560                         }
 561                 } else { // anon user
 562                         $user = User::newFromName( $params['ip'], false );
 563                 }
 564
 565                 $importSessionFunc = function ( User $user, array $params ) {
 566                         global $wgRequest, $wgUser;
 567
 568                         $context = RequestContext::getMain();
 569
 570                         // Commit and close any current session
 571                         if ( MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
 572                                 session_write_close(); // persist
 573                                 session_id( '' ); // detach
 574                                 $_SESSION = []; // clear in-memory array
 575                         }
 576
 577                         // Get new session, if applicable
 578                         $session = null;
 579                         if ( strlen( $params['sessionId'] ) ) { // don't make a new random ID
 580                                 $manager = MediaWiki\Session\SessionManager::singleton();
 581                                 $session = $manager->getSessionById( $params['sessionId'], true )
 582                                         ?: $manager->getEmptySession();
 583                         }
 584
 585                         // Remove any user IP or agent information, and attach the request
 586                         // with the new session.
 587                         $context->setRequest( new FauxRequest( [], false, $session ) );
 588                         $wgRequest = $context->getRequest(); // b/c
 589
 590                         // Now that all private information is detached from the user, it should
 591                         // be safe to load the new user. If errors occur or an exception is thrown
 592                         // and caught (leaving the main context in a mixed state), there is no risk
 593                         // of the User object being attached to the wrong IP, headers, or session.
 594                         $context->setUser( $user );
 595                         $wgUser = $context->getUser(); // b/c
 596                         if ( $session && MediaWiki\Session\PHPSessionHandler::isEnabled() ) {
 597                                 session_id( $session->getId() );
 598                                 MediaWiki\quietCall( 'session_start' );
 599                         }
 600                         $request = new FauxRequest( [], false, $session );
 601                         $request->setIP( $params['ip'] );
 602                         foreach ( $params['headers'] as $name => $value ) {
 603                                 $request->setHeader( $name, $value );
 604                         }
 605                         // Set the current context to use the new WebRequest
 606                         $context->setRequest( $request );
 607                         $wgRequest = $context->getRequest(); // b/c
 608                 };
 609
 610                 // Stash the old session and load in the new one
 611                 $oUser = self::getMain()->getUser();
 612                 $oParams = self::getMain()->exportSession();
 613                 $oRequest = self::getMain()->getRequest();
 614                 $importSessionFunc( $user, $params );
 615
 616                 // Set callback to save and close the new session and reload the old one
 617                 return new ScopedCallback(
 618                         function () use ( $importSessionFunc, $oUser, $oParams, $oRequest ) {
 619                                 global $wgRequest;
 620                                 $importSessionFunc( $oUser, $oParams );
 621                                 // Restore the exact previous Request object (instead of leaving FauxRequest)
 622                                 RequestContext::getMain()->setRequest( $oRequest );
 623                                 $wgRequest = RequestContext::getMain()->getRequest(); // b/c
 624                         }
 625                 );
 626         }
 627
 628         /**
 629          * Create a new extraneous context. The context is filled with information
 630          * external to the current session.
 631          * - Title is specified by argument
 632          * - Request is a FauxRequest, or a FauxRequest can be specified by argument
 633          * - User is an anonymous user, for separation IPv4 localhost is used
 634          * - Language will be based on the anonymous user and request, may be content
 635          *   language or a uselang param in the fauxrequest data may change the lang
 636          * - Skin will be based on the anonymous user, should be the wiki's default skin
 637          *
 638          * @param Title $title Title to use for the extraneous request
 639          * @param WebRequest|array $request A WebRequest or data to use for a FauxRequest
 640          * @return RequestContext
 641          */
 642         public static function newExtraneousContext( Title $title, $request = [] ) {
 643                 $context = new self;
 644                 $context->setTitle( $title );
 645                 if ( $request instanceof WebRequest ) {
 646                         $context->setRequest( $request );
 647                 } else {
 648                         $context->setRequest( new FauxRequest( $request ) );
 649                 }
 650                 $context->user = User::newFromName( '127.0.0.1', false );
 651
 652                 return $context;
 653         }
 654 }