includes/api/ApiMain.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 4, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  * @defgroup API API
  26  */
  27
  28 /**
  29  * This is the main API class, used for both external and internal processing.
  30  * When executed, it will create the requested formatter object,
  31  * instantiate and execute an object associated with the needed action,
  32  * and use formatter to print results.
  33  * In case of an exception, an error message will be printed using the same formatter.
  34  *
  35  * To use API from another application, run it using FauxRequest object, in which
  36  * case any internal exceptions will not be handled but passed up to the caller.
  37  * After successful execution, use getResult() for the resulting data.
  38  *
  39  * @ingroup API
  40  */
  41 class ApiMain extends ApiBase {
  42         /**
  43          * When no format parameter is given, this format will be used
  44          */
  45         const API_DEFAULT_FORMAT = 'jsonfm';
  46
  47         /**
  48          * List of available modules: action name => module class
  49          */
  50         private static $Modules = array(
  51                 'login' => 'ApiLogin',
  52                 'logout' => 'ApiLogout',
  53                 'createaccount' => 'ApiCreateAccount',
  54                 'query' => 'ApiQuery',
  55                 'expandtemplates' => 'ApiExpandTemplates',
  56                 'parse' => 'ApiParse',
  57                 'stashedit' => 'ApiStashEdit',
  58                 'opensearch' => 'ApiOpenSearch',
  59                 'feedcontributions' => 'ApiFeedContributions',
  60                 'feedrecentchanges' => 'ApiFeedRecentChanges',
  61                 'feedwatchlist' => 'ApiFeedWatchlist',
  62                 'help' => 'ApiHelp',
  63                 'paraminfo' => 'ApiParamInfo',
  64                 'rsd' => 'ApiRsd',
  65                 'compare' => 'ApiComparePages',
  66                 'tokens' => 'ApiTokens',
  67
  68                 // Write modules
  69                 'purge' => 'ApiPurge',
  70                 'setnotificationtimestamp' => 'ApiSetNotificationTimestamp',
  71                 'rollback' => 'ApiRollback',
  72                 'delete' => 'ApiDelete',
  73                 'undelete' => 'ApiUndelete',
  74                 'protect' => 'ApiProtect',
  75                 'block' => 'ApiBlock',
  76                 'unblock' => 'ApiUnblock',
  77                 'move' => 'ApiMove',
  78                 'edit' => 'ApiEditPage',
  79                 'upload' => 'ApiUpload',
  80                 'filerevert' => 'ApiFileRevert',
  81                 'emailuser' => 'ApiEmailUser',
  82                 'watch' => 'ApiWatch',
  83                 'patrol' => 'ApiPatrol',
  84                 'import' => 'ApiImport',
  85                 'clearhasmsg' => 'ApiClearHasMsg',
  86                 'userrights' => 'ApiUserrights',
  87                 'options' => 'ApiOptions',
  88                 'imagerotate' => 'ApiImageRotate',
  89                 'revisiondelete' => 'ApiRevisionDelete',
  90         );
  91
  92         /**
  93          * List of available formats: format name => format class
  94          */
  95         private static $Formats = array(
  96                 'json' => 'ApiFormatJson',
  97                 'jsonfm' => 'ApiFormatJson',
  98                 'php' => 'ApiFormatPhp',
  99                 'phpfm' => 'ApiFormatPhp',
 100                 'wddx' => 'ApiFormatWddx',
 101                 'wddxfm' => 'ApiFormatWddx',
 102                 'xml' => 'ApiFormatXml',
 103                 'xmlfm' => 'ApiFormatXml',
 104                 'yaml' => 'ApiFormatYaml',
 105                 'yamlfm' => 'ApiFormatYaml',
 106                 'rawfm' => 'ApiFormatJson',
 107                 'txt' => 'ApiFormatTxt',
 108                 'txtfm' => 'ApiFormatTxt',
 109                 'dbg' => 'ApiFormatDbg',
 110                 'dbgfm' => 'ApiFormatDbg',
 111                 'dump' => 'ApiFormatDump',
 112                 'dumpfm' => 'ApiFormatDump',
 113                 'none' => 'ApiFormatNone',
 114         );
 115
 116         // @codingStandardsIgnoreStart String contenation on "msg" not allowed to break long line
 117         /**
 118          * List of user roles that are specifically relevant to the API.
 119          * array( 'right' => array ( 'msg'    => 'Some message with a $1',
 120          *                           'params' => array ( $someVarToSubst ) ),
 121          *                          );
 122          */
 123         private static $mRights = array(
 124                 'writeapi' => array(
 125                         'msg' => 'right-writeapi',
 126                         'params' => array()
 127                 ),
 128                 'apihighlimits' => array(
 129                         'msg' => 'api-help-right-apihighlimits',
 130                         'params' => array( ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 )
 131                 )
 132         );
 133         // @codingStandardsIgnoreEnd
 134
 135         /**
 136          * @var ApiFormatBase
 137          */
 138         private $mPrinter;
 139
 140         private $mModuleMgr, $mResult;
 141         private $mAction;
 142         private $mEnableWrite;
 143         private $mInternalMode, $mSquidMaxage, $mModule;
 144
 145         private $mCacheMode = 'private';
 146         private $mCacheControl = array();
 147         private $mParamsUsed = array();
 148
 149         /**
 150          * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
 151          *
 152          * @param IContextSource|WebRequest $context If this is an instance of
 153          *    FauxRequest, errors are thrown and no printing occurs
 154          * @param bool $enableWrite Should be set to true if the api may modify data
 155          */
 156         public function __construct( $context = null, $enableWrite = false ) {
 157                 if ( $context === null ) {
 158                         $context = RequestContext::getMain();
 159                 } elseif ( $context instanceof WebRequest ) {
 160                         // BC for pre-1.19
 161                         $request = $context;
 162                         $context = RequestContext::getMain();
 163                 }
 164                 // We set a derivative context so we can change stuff later
 165                 $this->setContext( new DerivativeContext( $context ) );
 166
 167                 if ( isset( $request ) ) {
 168                         $this->getContext()->setRequest( $request );
 169                 }
 170
 171                 $this->mInternalMode = ( $this->getRequest() instanceof FauxRequest );
 172
 173                 // Special handling for the main module: $parent === $this
 174                 parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
 175
 176                 if ( !$this->mInternalMode ) {
 177                         // Impose module restrictions.
 178                         // If the current user cannot read,
 179                         // Remove all modules other than login
 180                         global $wgUser;
 181
 182                         if ( $this->getVal( 'callback' ) !== null ) {
 183                                 // JSON callback allows cross-site reads.
 184                                 // For safety, strip user credentials.
 185                                 wfDebug( "API: stripping user credentials for JSON callback\n" );
 186                                 $wgUser = new User();
 187                                 $this->getContext()->setUser( $wgUser );
 188                         }
 189                 }
 190
 191                 $uselang = $this->getParameter( 'uselang' );
 192                 if ( $uselang === 'user' ) {
 193                         $uselang = $this->getUser()->getOption( 'language' );
 194                         $uselang = RequestContext::sanitizeLangCode( $uselang );
 195                         Hooks::run( 'UserGetLanguageObject', array( $this->getUser(), &$uselang, $this ) );
 196                 } elseif ( $uselang === 'content' ) {
 197                         global $wgContLang;
 198                         $uselang = $wgContLang->getCode();
 199                 }
 200                 $code = RequestContext::sanitizeLangCode( $uselang );
 201                 $this->getContext()->setLanguage( $code );
 202                 if ( !$this->mInternalMode ) {
 203                         global $wgLang;
 204                         $wgLang = $this->getContext()->getLanguage();
 205                         RequestContext::getMain()->setLanguage( $wgLang );
 206                 }
 207
 208                 $config = $this->getConfig();
 209                 $this->mModuleMgr = new ApiModuleManager( $this );
 210                 $this->mModuleMgr->addModules( self::$Modules, 'action' );
 211                 $this->mModuleMgr->addModules( $config->get( 'APIModules' ), 'action' );
 212                 $this->mModuleMgr->addModules( self::$Formats, 'format' );
 213                 $this->mModuleMgr->addModules( $config->get( 'APIFormatModules' ), 'format' );
 214
 215                 $this->mResult = new ApiResult( $this );
 216                 $this->mEnableWrite = $enableWrite;
 217
 218                 $this->mSquidMaxage = -1; // flag for executeActionWithErrorHandling()
 219                 $this->mCommit = false;
 220         }
 221
 222         /**
 223          * Return true if the API was started by other PHP code using FauxRequest
 224          * @return bool
 225          */
 226         public function isInternalMode() {
 227                 return $this->mInternalMode;
 228         }
 229
 230         /**
 231          * Get the ApiResult object associated with current request
 232          *
 233          * @return ApiResult
 234          */
 235         public function getResult() {
 236                 return $this->mResult;
 237         }
 238
 239         /**
 240          * Get the API module object. Only works after executeAction()
 241          *
 242          * @return ApiBase
 243          */
 244         public function getModule() {
 245                 return $this->mModule;
 246         }
 247
 248         /**
 249          * Get the result formatter object. Only works after setupExecuteAction()
 250          *
 251          * @return ApiFormatBase
 252          */
 253         public function getPrinter() {
 254                 return $this->mPrinter;
 255         }
 256
 257         /**
 258          * Set how long the response should be cached.
 259          *
 260          * @param int $maxage
 261          */
 262         public function setCacheMaxAge( $maxage ) {
 263                 $this->setCacheControl( array(
 264                         'max-age' => $maxage,
 265                         's-maxage' => $maxage
 266                 ) );
 267         }
 268
 269         /**
 270          * Set the type of caching headers which will be sent.
 271          *
 272          * @param string $mode One of:
 273          *    - 'public':     Cache this object in public caches, if the maxage or smaxage
 274          *         parameter is set, or if setCacheMaxAge() was called. If a maximum age is
 275          *         not provided by any of these means, the object will be private.
 276          *    - 'private':    Cache this object only in private client-side caches.
 277          *    - 'anon-public-user-private': Make this object cacheable for logged-out
 278          *         users, but private for logged-in users. IMPORTANT: If this is set, it must be
 279          *         set consistently for a given URL, it cannot be set differently depending on
 280          *         things like the contents of the database, or whether the user is logged in.
 281          *
 282          *  If the wiki does not allow anonymous users to read it, the mode set here
 283          *  will be ignored, and private caching headers will always be sent. In other words,
 284          *  the "public" mode is equivalent to saying that the data sent is as public as a page
 285          *  view.
 286          *
 287          *  For user-dependent data, the private mode should generally be used. The
 288          *  anon-public-user-private mode should only be used where there is a particularly
 289          *  good performance reason for caching the anonymous response, but where the
 290          *  response to logged-in users may differ, or may contain private data.
 291          *
 292          *  If this function is never called, then the default will be the private mode.
 293          */
 294         public function setCacheMode( $mode ) {
 295                 if ( !in_array( $mode, array( 'private', 'public', 'anon-public-user-private' ) ) ) {
 296                         wfDebug( __METHOD__ . ": unrecognised cache mode \"$mode\"\n" );
 297
 298                         // Ignore for forwards-compatibility
 299                         return;
 300                 }
 301
 302                 if ( !User::isEveryoneAllowed( 'read' ) ) {
 303                         // Private wiki, only private headers
 304                         if ( $mode !== 'private' ) {
 305                                 wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki\n" );
 306
 307                                 return;
 308                         }
 309                 }
 310
 311                 if ( $mode === 'public' && $this->getParameter( 'uselang' ) === 'user' ) {
 312                         // User language is used for i18n, so we don't want to publicly
 313                         // cache. Anons are ok, because if they have non-default language
 314                         // then there's an appropriate Vary header set by whatever set
 315                         // their non-default language.
 316                         wfDebug( __METHOD__ . ": downgrading cache mode 'public' to " .
 317                                 "'anon-public-user-private' due to uselang=user\n" );
 318                         $mode = 'anon-public-user-private';
 319                 }
 320
 321                 wfDebug( __METHOD__ . ": setting cache mode $mode\n" );
 322                 $this->mCacheMode = $mode;
 323         }
 324
 325         /**
 326          * Set directives (key/value pairs) for the Cache-Control header.
 327          * Boolean values will be formatted as such, by including or omitting
 328          * without an equals sign.
 329          *
 330          * Cache control values set here will only be used if the cache mode is not
 331          * private, see setCacheMode().
 332          *
 333          * @param array $directives
 334          */
 335         public function setCacheControl( $directives ) {
 336                 $this->mCacheControl = $directives + $this->mCacheControl;
 337         }
 338
 339         /**
 340          * Create an instance of an output formatter by its name
 341          *
 342          * @param string $format
 343          *
 344          * @return ApiFormatBase
 345          */
 346         public function createPrinterByName( $format ) {
 347                 $printer = $this->mModuleMgr->getModule( $format, 'format' );
 348                 if ( $printer === null ) {
 349                         $this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
 350                 }
 351
 352                 return $printer;
 353         }
 354
 355         /**
 356          * Execute api request. Any errors will be handled if the API was called by the remote client.
 357          */
 358         public function execute() {
 359                 $this->profileIn();
 360                 if ( $this->mInternalMode ) {
 361                         $this->executeAction();
 362                 } else {
 363                         $this->executeActionWithErrorHandling();
 364                 }
 365
 366                 $this->profileOut();
 367         }
 368
 369         /**
 370          * Execute an action, and in case of an error, erase whatever partial results
 371          * have been accumulated, and replace it with an error message and a help screen.
 372          */
 373         protected function executeActionWithErrorHandling() {
 374                 // Verify the CORS header before executing the action
 375                 if ( !$this->handleCORS() ) {
 376                         // handleCORS() has sent a 403, abort
 377                         return;
 378                 }
 379
 380                 // Exit here if the request method was OPTIONS
 381                 // (assume there will be a followup GET or POST)
 382                 if ( $this->getRequest()->getMethod() === 'OPTIONS' ) {
 383                         return;
 384                 }
 385
 386                 // In case an error occurs during data output,
 387                 // clear the output buffer and print just the error information
 388                 ob_start();
 389
 390                 $t = microtime( true );
 391                 try {
 392                         $this->executeAction();
 393                 } catch ( Exception $e ) {
 394                         $this->handleException( $e );
 395                 }
 396
 397                 // Log the request whether or not there was an error
 398                 $this->logRequest( microtime( true ) - $t );
 399
 400                 // Send cache headers after any code which might generate an error, to
 401                 // avoid sending public cache headers for errors.
 402                 $this->sendCacheHeaders();
 403
 404                 ob_end_flush();
 405         }
 406
 407         /**
 408          * Handle an exception as an API response
 409          *
 410          * @since 1.23
 411          * @param Exception $e
 412          */
 413         protected function handleException( Exception $e ) {
 414                 // Bug 63145: Rollback any open database transactions
 415                 if ( !( $e instanceof UsageException ) ) {
 416                         // UsageExceptions are intentional, so don't rollback if that's the case
 417                         MWExceptionHandler::rollbackMasterChangesAndLog( $e );
 418                 }
 419
 420                 // Allow extra cleanup and logging
 421                 Hooks::run( 'ApiMain::onException', array( $this, $e ) );
 422
 423                 // Log it
 424                 if ( !( $e instanceof UsageException ) ) {
 425                         MWExceptionHandler::logException( $e );
 426                 }
 427
 428                 // Handle any kind of exception by outputting properly formatted error message.
 429                 // If this fails, an unhandled exception should be thrown so that global error
 430                 // handler will process and log it.
 431
 432                 $errCode = $this->substituteResultWithError( $e );
 433
 434                 // Error results should not be cached
 435                 $this->setCacheMode( 'private' );
 436
 437                 $response = $this->getRequest()->response();
 438                 $headerStr = 'MediaWiki-API-Error: ' . $errCode;
 439                 if ( $e->getCode() === 0 ) {
 440                         $response->header( $headerStr );
 441                 } else {
 442                         $response->header( $headerStr, true, $e->getCode() );
 443                 }
 444
 445                 // Reset and print just the error message
 446                 ob_clean();
 447
 448                 // If the error occurred during printing, do a printer->profileOut()
 449                 $this->mPrinter->safeProfileOut();
 450                 $this->printResult( true );
 451         }
 452
 453         /**
 454          * Handle an exception from the ApiBeforeMain hook.
 455          *
 456          * This tries to print the exception as an API response, to be more
 457          * friendly to clients. If it fails, it will rethrow the exception.
 458          *
 459          * @since 1.23
 460          * @param Exception $e
 461          * @throws Exception
 462          */
 463         public static function handleApiBeforeMainException( Exception $e ) {
 464                 ob_start();
 465
 466                 try {
 467                         $main = new self( RequestContext::getMain(), false );
 468                         $main->handleException( $e );
 469                 } catch ( Exception $e2 ) {
 470                         // Nope, even that didn't work. Punt.
 471                         throw $e;
 472                 }
 473
 474                 // Log the request and reset cache headers
 475                 $main->logRequest( 0 );
 476                 $main->sendCacheHeaders();
 477
 478                 ob_end_flush();
 479         }
 480
 481         /**
 482          * Check the &origin= query parameter against the Origin: HTTP header and respond appropriately.
 483          *
 484          * If no origin parameter is present, nothing happens.
 485          * If an origin parameter is present but doesn't match the Origin header, a 403 status code
 486          * is set and false is returned.
 487          * If the parameter and the header do match, the header is checked against $wgCrossSiteAJAXdomains
 488          * and $wgCrossSiteAJAXdomainExceptions, and if the origin qualifies, the appropriate CORS
 489          * headers are set.
 490          * http://www.w3.org/TR/cors/#resource-requests
 491          * http://www.w3.org/TR/cors/#resource-preflight-requests
 492          *
 493          * @return bool False if the caller should abort (403 case), true otherwise (all other cases)
 494          */
 495         protected function handleCORS() {
 496                 $originParam = $this->getParameter( 'origin' ); // defaults to null
 497                 if ( $originParam === null ) {
 498                         // No origin parameter, nothing to do
 499                         return true;
 500                 }
 501
 502                 $request = $this->getRequest();
 503                 $response = $request->response();
 504
 505                 // Origin: header is a space-separated list of origins, check all of them
 506                 $originHeader = $request->getHeader( 'Origin' );
 507                 if ( $originHeader === false ) {
 508                         $origins = array();
 509                 } else {
 510                         $originHeader = trim( $originHeader );
 511                         $origins = preg_split( '/\s+/', $originHeader );
 512                 }
 513
 514                 if ( !in_array( $originParam, $origins ) ) {
 515                         // origin parameter set but incorrect
 516                         // Send a 403 response
 517                         $message = HttpStatus::getMessage( 403 );
 518                         $response->header( "HTTP/1.1 403 $message", true, 403 );
 519                         $response->header( 'Cache-Control: no-cache' );
 520                         echo "'origin' parameter does not match Origin header\n";
 521
 522                         return false;
 523                 }
 524
 525                 $config = $this->getConfig();
 526                 $matchOrigin = count( $origins ) === 1 && self::matchOrigin(
 527                         $originParam,
 528                         $config->get( 'CrossSiteAJAXdomains' ),
 529                         $config->get( 'CrossSiteAJAXdomainExceptions' )
 530                 );
 531
 532                 if ( $matchOrigin ) {
 533                         $requestedMethod = $request->getHeader( 'Access-Control-Request-Method' );
 534                         $preflight = $request->getMethod() === 'OPTIONS' && $requestedMethod !== false;
 535                         if ( $preflight ) {
 536                                 // This is a CORS preflight request
 537                                 if ( $requestedMethod !== 'POST' && $requestedMethod !== 'GET' ) {
 538                                         // If method is not a case-sensitive match, do not set any additional headers and terminate.
 539                                         return true;
 540                                 }
 541                                 // We allow the actual request to send the following headers
 542                                 $requestedHeaders = $request->getHeader( 'Access-Control-Request-Headers' );
 543                                 if ( $requestedHeaders !== false ) {
 544                                         if ( !self::matchRequestedHeaders( $requestedHeaders ) ) {
 545                                                 return true;
 546                                         }
 547                                         $response->header( 'Access-Control-Allow-Headers: ' . $requestedHeaders );
 548                                 }
 549
 550                                 // We only allow the actual request to be GET or POST
 551                                 $response->header( 'Access-Control-Allow-Methods: POST, GET' );
 552                         }
 553
 554                         $response->header( "Access-Control-Allow-Origin: $originHeader" );
 555                         $response->header( 'Access-Control-Allow-Credentials: true' );
 556
 557                         if ( !$preflight ) {
 558                                 $response->header( 'Access-Control-Expose-Headers: MediaWiki-API-Error, Retry-After, X-Database-Lag' );
 559                         }
 560                 }
 561
 562                 $this->getOutput()->addVaryHeader( 'Origin' );
 563                 return true;
 564         }
 565
 566         /**
 567          * Attempt to match an Origin header against a set of rules and a set of exceptions
 568          * @param string $value Origin header
 569          * @param array $rules Set of wildcard rules
 570          * @param array $exceptions Set of wildcard rules
 571          * @return bool True if $value matches a rule in $rules and doesn't match
 572          *    any rules in $exceptions, false otherwise
 573          */
 574         protected static function matchOrigin( $value, $rules, $exceptions ) {
 575                 foreach ( $rules as $rule ) {
 576                         if ( preg_match( self::wildcardToRegex( $rule ), $value ) ) {
 577                                 // Rule matches, check exceptions
 578                                 foreach ( $exceptions as $exc ) {
 579                                         if ( preg_match( self::wildcardToRegex( $exc ), $value ) ) {
 580                                                 return false;
 581                                         }
 582                                 }
 583
 584                                 return true;
 585                         }
 586                 }
 587
 588                 return false;
 589         }
 590
 591         /**
 592          * Attempt to validate the value of Access-Control-Request-Headers against a list
 593          * of headers that we allow the follow up request to send.
 594          *
 595          * @param string $requestedHeaders Comma seperated list of HTTP headers
 596          * @return bool True if all requested headers are in the list of allowed headers
 597          */
 598         protected static function matchRequestedHeaders( $requestedHeaders ) {
 599                 if ( trim( $requestedHeaders ) === '' ) {
 600                         return true;
 601                 }
 602                 $requestedHeaders = explode( ',', $requestedHeaders );
 603                 $allowedAuthorHeaders = array_flip( array(
 604                         /* simple headers (see spec) */
 605                         'accept',
 606                         'accept-language',
 607                         'content-language',
 608                         'content-type',
 609                         /* non-authorable headers in XHR, which are however requested by some UAs */
 610                         'accept-encoding',
 611                         'dnt',
 612                         'origin',
 613                         /* MediaWiki whitelist */
 614                         'api-user-agent',
 615                 ) );
 616                 foreach ( $requestedHeaders as $rHeader ) {
 617                         $rHeader = strtolower( trim( $rHeader ) );
 618                         if ( !isset( $allowedAuthorHeaders[$rHeader] ) ) {
 619                                 wfDebugLog( 'api', 'CORS preflight failed on requested header: ' . $rHeader );
 620                                 return false;
 621                         }
 622                 }
 623                 return true;
 624         }
 625
 626         /**
 627          * Helper function to convert wildcard string into a regex
 628          * '*' => '.*?'
 629          * '?' => '.'
 630          *
 631          * @param string $wildcard String with wildcards
 632          * @return string Regular expression
 633          */
 634         protected static function wildcardToRegex( $wildcard ) {
 635                 $wildcard = preg_quote( $wildcard, '/' );
 636                 $wildcard = str_replace(
 637                         array( '\*', '\?' ),
 638                         array( '.*?', '.' ),
 639                         $wildcard
 640                 );
 641
 642                 return "/^https?:\/\/$wildcard$/";
 643         }
 644
 645         protected function sendCacheHeaders() {
 646                 $response = $this->getRequest()->response();
 647                 $out = $this->getOutput();
 648
 649                 $config = $this->getConfig();
 650
 651                 if ( $config->get( 'VaryOnXFP' ) ) {
 652                         $out->addVaryHeader( 'X-Forwarded-Proto' );
 653                 }
 654
 655                 if ( $this->mCacheMode == 'private' ) {
 656                         $response->header( 'Cache-Control: private' );
 657                         return;
 658                 }
 659
 660                 $useXVO = $config->get( 'UseXVO' );
 661                 if ( $this->mCacheMode == 'anon-public-user-private' ) {
 662                         $out->addVaryHeader( 'Cookie' );
 663                         $response->header( $out->getVaryHeader() );
 664                         if ( $useXVO ) {
 665                                 $response->header( $out->getXVO() );
 666                                 if ( $out->haveCacheVaryCookies() ) {
 667                                         // Logged in, mark this request private
 668                                         $response->header( 'Cache-Control: private' );
 669                                         return;
 670                                 }
 671                                 // Logged out, send normal public headers below
 672                         } elseif ( session_id() != '' ) {
 673                                 // Logged in or otherwise has session (e.g. anonymous users who have edited)
 674                                 // Mark request private
 675                                 $response->header( 'Cache-Control: private' );
 676
 677                                 return;
 678                         } // else no XVO and anonymous, send public headers below
 679                 }
 680
 681                 // Send public headers
 682                 $response->header( $out->getVaryHeader() );
 683                 if ( $useXVO ) {
 684                         $response->header( $out->getXVO() );
 685                 }
 686
 687                 // If nobody called setCacheMaxAge(), use the (s)maxage parameters
 688                 if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
 689                         $this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
 690                 }
 691                 if ( !isset( $this->mCacheControl['max-age'] ) ) {
 692                         $this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
 693                 }
 694
 695                 if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
 696                         // Public cache not requested
 697                         // Sending a Vary header in this case is harmless, and protects us
 698                         // against conditional calls of setCacheMaxAge().
 699                         $response->header( 'Cache-Control: private' );
 700
 701                         return;
 702                 }
 703
 704                 $this->mCacheControl['public'] = true;
 705
 706                 // Send an Expires header
 707                 $maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
 708                 $expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
 709                 $response->header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );
 710
 711                 // Construct the Cache-Control header
 712                 $ccHeader = '';
 713                 $separator = '';
 714                 foreach ( $this->mCacheControl as $name => $value ) {
 715                         if ( is_bool( $value ) ) {
 716                                 if ( $value ) {
 717                                         $ccHeader .= $separator . $name;
 718                                         $separator = ', ';
 719                                 }
 720                         } else {
 721                                 $ccHeader .= $separator . "$name=$value";
 722                                 $separator = ', ';
 723                         }
 724                 }
 725
 726                 $response->header( "Cache-Control: $ccHeader" );
 727         }
 728
 729         /**
 730          * Replace the result data with the information about an exception.
 731          * Returns the error code
 732          * @param Exception $e
 733          * @return string
 734          */
 735         protected function substituteResultWithError( $e ) {
 736                 $result = $this->getResult();
 737
 738                 // Printer may not be initialized if the extractRequestParams() fails for the main module
 739                 if ( !isset( $this->mPrinter ) ) {
 740                         // The printer has not been created yet. Try to manually get formatter value.
 741                         $value = $this->getRequest()->getVal( 'format', self::API_DEFAULT_FORMAT );
 742                         if ( !$this->mModuleMgr->isDefined( $value, 'format' ) ) {
 743                                 $value = self::API_DEFAULT_FORMAT;
 744                         }
 745
 746                         $this->mPrinter = $this->createPrinterByName( $value );
 747                 }
 748
 749                 // Printer may not be able to handle errors. This is particularly
 750                 // likely if the module returns something for getCustomPrinter().
 751                 if ( !$this->mPrinter->canPrintErrors() ) {
 752                         $this->mPrinter->safeProfileOut();
 753                         $this->mPrinter = $this->createPrinterByName( self::API_DEFAULT_FORMAT );
 754                 }
 755
 756                 // Update raw mode flag for the selected printer.
 757                 $result->setRawMode( $this->mPrinter->getNeedsRawData() );
 758
 759                 $config = $this->getConfig();
 760
 761                 if ( $e instanceof UsageException ) {
 762                         // User entered incorrect parameters - generate error response
 763                         $errMessage = $e->getMessageArray();
 764                         $link = wfExpandUrl( wfScript( 'api' ) );
 765                         ApiResult::setContent( $errMessage, "See $link for API usage" );
 766                 } else {
 767                         // Something is seriously wrong
 768                         if ( ( $e instanceof DBQueryError ) && !$config->get( 'ShowSQLErrors' ) ) {
 769                                 $info = 'Database query error';
 770                         } else {
 771                                 $info = "Exception Caught: {$e->getMessage()}";
 772                         }
 773
 774                         $errMessage = array(
 775                                 'code' => 'internal_api_error_' . get_class( $e ),
 776                                 'info' => '[' . MWExceptionHandler::getLogId( $e ) . '] ' . $info,
 777                         );
 778                         if ( $config->get( 'ShowExceptionDetails' ) ) {
 779                                 ApiResult::setContent(
 780                                         $errMessage,
 781                                         MWExceptionHandler::getRedactedTraceAsString( $e )
 782                                 );
 783                         }
 784                 }
 785
 786                 // Remember all the warnings to re-add them later
 787                 $oldResult = $result->getData();
 788                 $warnings = isset( $oldResult['warnings'] ) ? $oldResult['warnings'] : null;
 789
 790                 $result->reset();
 791                 // Re-add the id
 792                 $requestid = $this->getParameter( 'requestid' );
 793                 if ( !is_null( $requestid ) ) {
 794                         $result->addValue( null, 'requestid', $requestid, ApiResult::NO_SIZE_CHECK );
 795                 }
 796                 if ( $config->get( 'ShowHostnames' ) ) {
 797                         // servedby is especially useful when debugging errors
 798                         $result->addValue( null, 'servedby', wfHostName(), ApiResult::NO_SIZE_CHECK );
 799                 }
 800                 if ( $warnings !== null ) {
 801                         $result->addValue( null, 'warnings', $warnings, ApiResult::NO_SIZE_CHECK );
 802                 }
 803
 804                 $result->addValue( null, 'error', $errMessage, ApiResult::NO_SIZE_CHECK );
 805
 806                 return $errMessage['code'];
 807         }
 808
 809         /**
 810          * Set up for the execution.
 811          * @return array
 812          */
 813         protected function setupExecuteAction() {
 814                 // First add the id to the top element
 815                 $result = $this->getResult();
 816                 $requestid = $this->getParameter( 'requestid' );
 817                 if ( !is_null( $requestid ) ) {
 818                         $result->addValue( null, 'requestid', $requestid );
 819                 }
 820
 821                 if ( $this->getConfig()->get( 'ShowHostnames' ) ) {
 822                         $servedby = $this->getParameter( 'servedby' );
 823                         if ( $servedby ) {
 824                                 $result->addValue( null, 'servedby', wfHostName() );
 825                         }
 826                 }
 827
 828                 if ( $this->getParameter( 'curtimestamp' ) ) {
 829                         $result->addValue( null, 'curtimestamp', wfTimestamp( TS_ISO_8601, time() ),
 830                                 ApiResult::NO_SIZE_CHECK );
 831                 }
 832
 833                 $params = $this->extractRequestParams();
 834
 835                 $this->mAction = $params['action'];
 836
 837                 if ( !is_string( $this->mAction ) ) {
 838                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 839                 }
 840
 841                 return $params;
 842         }
 843
 844         /**
 845          * Set up the module for response
 846          * @return ApiBase The module that will handle this action
 847          * @throws MWException
 848          * @throws UsageException
 849          */
 850         protected function setupModule() {
 851                 // Instantiate the module requested by the user
 852                 $module = $this->mModuleMgr->getModule( $this->mAction, 'action' );
 853                 if ( $module === null ) {
 854                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 855                 }
 856                 $moduleParams = $module->extractRequestParams();
 857
 858                 // Check token, if necessary
 859                 if ( $module->needsToken() === true ) {
 860                         throw new MWException(
 861                                 "Module '{$module->getModuleName()}' must be updated for the new token handling. " .
 862                                 "See documentation for ApiBase::needsToken for details."
 863                         );
 864                 }
 865                 if ( $module->needsToken() ) {
 866                         if ( !$module->mustBePosted() ) {
 867                                 throw new MWException(
 868                                         "Module '{$module->getModuleName()}' must require POST to use tokens."
 869                                 );
 870                         }
 871
 872                         if ( !isset( $moduleParams['token'] ) ) {
 873                                 $this->dieUsageMsg( array( 'missingparam', 'token' ) );
 874                         }
 875
 876                         if ( !$this->getConfig()->get( 'DebugAPI' ) &&
 877                                 array_key_exists(
 878                                         $module->encodeParamName( 'token' ),
 879                                         $this->getRequest()->getQueryValues()
 880                                 )
 881                         ) {
 882                                 $this->dieUsage(
 883                                         "The '{$module->encodeParamName( 'token' )}' parameter was found in the query string, but must be in the POST body",
 884                                         'mustposttoken'
 885                                 );
 886                         }
 887
 888                         if ( !$module->validateToken( $moduleParams['token'], $moduleParams ) ) {
 889                                 $this->dieUsageMsg( 'sessionfailure' );
 890                         }
 891                 }
 892
 893                 return $module;
 894         }
 895
 896         /**
 897          * Check the max lag if necessary
 898          * @param ApiBase $module Api module being used
 899          * @param array $params Array an array containing the request parameters.
 900          * @return bool True on success, false should exit immediately
 901          */
 902         protected function checkMaxLag( $module, $params ) {
 903                 if ( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
 904                         // Check for maxlag
 905                         $maxLag = $params['maxlag'];
 906                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 907                         if ( $lag > $maxLag ) {
 908                                 $response = $this->getRequest()->response();
 909
 910                                 $response->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 911                                 $response->header( 'X-Database-Lag: ' . intval( $lag ) );
 912
 913                                 if ( $this->getConfig()->get( 'ShowHostnames' ) ) {
 914                                         $this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
 915                                 }
 916
 917                                 $this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
 918                         }
 919                 }
 920
 921                 return true;
 922         }
 923
 924         /**
 925          * Check for sufficient permissions to execute
 926          * @param ApiBase $module An Api module
 927          */
 928         protected function checkExecutePermissions( $module ) {
 929                 $user = $this->getUser();
 930                 if ( $module->isReadMode() && !User::isEveryoneAllowed( 'read' ) &&
 931                         !$user->isAllowed( 'read' )
 932                 ) {
 933                         $this->dieUsageMsg( 'readrequired' );
 934                 }
 935                 if ( $module->isWriteMode() ) {
 936                         if ( !$this->mEnableWrite ) {
 937                                 $this->dieUsageMsg( 'writedisabled' );
 938                         }
 939                         if ( !$user->isAllowed( 'writeapi' ) ) {
 940                                 $this->dieUsageMsg( 'writerequired' );
 941                         }
 942                         if ( wfReadOnly() ) {
 943                                 $this->dieReadOnly();
 944                         }
 945                 }
 946
 947                 // Allow extensions to stop execution for arbitrary reasons.
 948                 $message = false;
 949                 if ( !Hooks::run( 'ApiCheckCanExecute', array( $module, $user, &$message ) ) ) {
 950                         $this->dieUsageMsg( $message );
 951                 }
 952         }
 953
 954         /**
 955          * Check asserts of the user's rights
 956          * @param array $params
 957          */
 958         protected function checkAsserts( $params ) {
 959                 if ( isset( $params['assert'] ) ) {
 960                         $user = $this->getUser();
 961                         switch ( $params['assert'] ) {
 962                                 case 'user':
 963                                         if ( $user->isAnon() ) {
 964                                                 $this->dieUsage( 'Assertion that the user is logged in failed', 'assertuserfailed' );
 965                                         }
 966                                         break;
 967                                 case 'bot':
 968                                         if ( !$user->isAllowed( 'bot' ) ) {
 969                                                 $this->dieUsage( 'Assertion that the user has the bot right failed', 'assertbotfailed' );
 970                                         }
 971                                         break;
 972                         }
 973                 }
 974         }
 975
 976         /**
 977          * Check POST for external response and setup result printer
 978          * @param ApiBase $module An Api module
 979          * @param array $params An array with the request parameters
 980          */
 981         protected function setupExternalResponse( $module, $params ) {
 982                 if ( !$this->getRequest()->wasPosted() && $module->mustBePosted() ) {
 983                         // Module requires POST. GET request might still be allowed
 984                         // if $wgDebugApi is true, otherwise fail.
 985                         $this->dieUsageMsgOrDebug( array( 'mustbeposted', $this->mAction ) );
 986                 }
 987
 988                 // See if custom printer is used
 989                 $this->mPrinter = $module->getCustomPrinter();
 990                 if ( is_null( $this->mPrinter ) ) {
 991                         // Create an appropriate printer
 992                         $this->mPrinter = $this->createPrinterByName( $params['format'] );
 993                 }
 994
 995                 if ( $this->mPrinter->getNeedsRawData() ) {
 996                         $this->getResult()->setRawMode();
 997                 }
 998         }
 999
1000         /**
1001          * Execute the actual module, without any error handling
1002          */
1003         protected function executeAction() {
1004                 $params = $this->setupExecuteAction();
1005                 $module = $this->setupModule();
1006                 $this->mModule = $module;
1007
1008                 $this->checkExecutePermissions( $module );
1009
1010                 if ( !$this->checkMaxLag( $module, $params ) ) {
1011                         return;
1012                 }
1013
1014                 if ( !$this->mInternalMode ) {
1015                         $this->setupExternalResponse( $module, $params );
1016                 }
1017
1018                 $this->checkAsserts( $params );
1019
1020                 // Execute
1021                 $module->profileIn();
1022                 $module->execute();
1023                 Hooks::run( 'APIAfterExecute', array( &$module ) );
1024                 $module->profileOut();
1025
1026                 $this->reportUnusedParams();
1027
1028                 if ( !$this->mInternalMode ) {
1029                         //append Debug information
1030                         MWDebug::appendDebugInfoToApiResult( $this->getContext(), $this->getResult() );
1031
1032                         // Print result data
1033                         $this->printResult( false );
1034                 }
1035         }
1036
1037         /**
1038          * Log the preceding request
1039          * @param int $time Time in seconds
1040          */
1041         protected function logRequest( $time ) {
1042                 $request = $this->getRequest();
1043                 $milliseconds = $time === null ? '?' : round( $time * 1000 );
1044                 $s = 'API' .
1045                         ' ' . $request->getMethod() .
1046                         ' ' . wfUrlencode( str_replace( ' ', '_', $this->getUser()->getName() ) ) .
1047                         ' ' . $request->getIP() .
1048                         ' T=' . $milliseconds . 'ms';
1049                 foreach ( $this->getParamsUsed() as $name ) {
1050                         $value = $request->getVal( $name );
1051                         if ( $value === null ) {
1052                                 continue;
1053                         }
1054                         $s .= ' ' . $name . '=';
1055                         if ( strlen( $value ) > 256 ) {
1056                                 $encValue = $this->encodeRequestLogValue( substr( $value, 0, 256 ) );
1057                                 $s .= $encValue . '[...]';
1058                         } else {
1059                                 $s .= $this->encodeRequestLogValue( $value );
1060                         }
1061                 }
1062                 $s .= "\n";
1063                 wfDebugLog( 'api', $s, 'private' );
1064         }
1065
1066         /**
1067          * Encode a value in a format suitable for a space-separated log line.
1068          * @param string $s
1069          * @return string
1070          */
1071         protected function encodeRequestLogValue( $s ) {
1072                 static $table;
1073                 if ( !$table ) {
1074                         $chars = ';@$!*(),/:';
1075                         $numChars = strlen( $chars );
1076                         for ( $i = 0; $i < $numChars; $i++ ) {
1077                                 $table[rawurlencode( $chars[$i] )] = $chars[$i];
1078                         }
1079                 }
1080
1081                 return strtr( rawurlencode( $s ), $table );
1082         }
1083
1084         /**
1085          * Get the request parameters used in the course of the preceding execute() request
1086          * @return array
1087          */
1088         protected function getParamsUsed() {
1089                 return array_keys( $this->mParamsUsed );
1090         }
1091
1092         /**
1093          * Get a request value, and register the fact that it was used, for logging.
1094          * @param string $name
1095          * @param mixed $default
1096          * @return mixed
1097          */
1098         public function getVal( $name, $default = null ) {
1099                 $this->mParamsUsed[$name] = true;
1100
1101                 $ret = $this->getRequest()->getVal( $name );
1102                 if ( $ret === null ) {
1103                         if ( $this->getRequest()->getArray( $name ) !== null ) {
1104                                 // See bug 10262 for why we don't just join( '|', ... ) the
1105                                 // array.
1106                                 $this->setWarning(
1107                                         "Parameter '$name' uses unsupported PHP array syntax"
1108                                 );
1109                         }
1110                         $ret = $default;
1111                 }
1112                 return $ret;
1113         }
1114
1115         /**
1116          * Get a boolean request value, and register the fact that the parameter
1117          * was used, for logging.
1118          * @param string $name
1119          * @return bool
1120          */
1121         public function getCheck( $name ) {
1122                 return $this->getVal( $name, null ) !== null;
1123         }
1124
1125         /**
1126          * Get a request upload, and register the fact that it was used, for logging.
1127          *
1128          * @since 1.21
1129          * @param string $name Parameter name
1130          * @return WebRequestUpload
1131          */
1132         public function getUpload( $name ) {
1133                 $this->mParamsUsed[$name] = true;
1134
1135                 return $this->getRequest()->getUpload( $name );
1136         }
1137
1138         /**
1139          * Report unused parameters, so the client gets a hint in case it gave us parameters we don't know,
1140          * for example in case of spelling mistakes or a missing 'g' prefix for generators.
1141          */
1142         protected function reportUnusedParams() {
1143                 $paramsUsed = $this->getParamsUsed();
1144                 $allParams = $this->getRequest()->getValueNames();
1145
1146                 if ( !$this->mInternalMode ) {
1147                         // Printer has not yet executed; don't warn that its parameters are unused
1148                         $printerParams = array_map(
1149                                 array( $this->mPrinter, 'encodeParamName' ),
1150                                 array_keys( $this->mPrinter->getFinalParams() ?: array() )
1151                         );
1152                         $unusedParams = array_diff( $allParams, $paramsUsed, $printerParams );
1153                 } else {
1154                         $unusedParams = array_diff( $allParams, $paramsUsed );
1155                 }
1156
1157                 if ( count( $unusedParams ) ) {
1158                         $s = count( $unusedParams ) > 1 ? 's' : '';
1159                         $this->setWarning( "Unrecognized parameter$s: '" . implode( $unusedParams, "', '" ) . "'" );
1160                 }
1161         }
1162
1163         /**
1164          * Print results using the current printer
1165          *
1166          * @param bool $isError
1167          */
1168         protected function printResult( $isError ) {
1169                 if ( $this->getConfig()->get( 'DebugAPI' ) !== false ) {
1170                         $this->setWarning( 'SECURITY WARNING: $wgDebugAPI is enabled' );
1171                 }
1172
1173                 $this->getResult()->cleanUpUTF8();
1174                 $printer = $this->mPrinter;
1175                 $printer->profileIn();
1176
1177                 $printer->initPrinter( false );
1178
1179                 $printer->execute();
1180                 $printer->closePrinter();
1181                 $printer->profileOut();
1182         }
1183
1184         /**
1185          * @return bool
1186          */
1187         public function isReadMode() {
1188                 return false;
1189         }
1190
1191         /**
1192          * See ApiBase for description.
1193          *
1194          * @return array
1195          */
1196         public function getAllowedParams() {
1197                 return array(
1198                         'action' => array(
1199                                 ApiBase::PARAM_DFLT => 'help',
1200                                 ApiBase::PARAM_TYPE => 'submodule',
1201                         ),
1202                         'format' => array(
1203                                 ApiBase::PARAM_DFLT => ApiMain::API_DEFAULT_FORMAT,
1204                                 ApiBase::PARAM_TYPE => 'submodule',
1205                         ),
1206                         'maxlag' => array(
1207                                 ApiBase::PARAM_TYPE => 'integer'
1208                         ),
1209                         'smaxage' => array(
1210                                 ApiBase::PARAM_TYPE => 'integer',
1211                                 ApiBase::PARAM_DFLT => 0
1212                         ),
1213                         'maxage' => array(
1214                                 ApiBase::PARAM_TYPE => 'integer',
1215                                 ApiBase::PARAM_DFLT => 0
1216                         ),
1217                         'assert' => array(
1218                                 ApiBase::PARAM_TYPE => array( 'user', 'bot' )
1219                         ),
1220                         'requestid' => null,
1221                         'servedby' => false,
1222                         'curtimestamp' => false,
1223                         'origin' => null,
1224                         'uselang' => array(
1225                                 ApiBase::PARAM_DFLT => 'user',
1226                         ),
1227                 );
1228         }
1229
1230         /** @see ApiBase::getExamplesMessages() */
1231         protected function getExamplesMessages() {
1232                 return array(
1233                         'action=help'
1234                                 => 'apihelp-help-example-main',
1235                         'action=help&recursivesubmodules=1'
1236                                 => 'apihelp-help-example-recursive',
1237                 );
1238         }
1239
1240         public function modifyHelp( array &$help, array $options ) {
1241                 // Wish PHP had an "array_insert_before". Instead, we have to manually
1242                 // reindex the array to get 'permissions' in the right place.
1243                 $oldHelp = $help;
1244                 $help = array();
1245                 foreach ( $oldHelp as $k => $v ) {
1246                         if ( $k === 'submodules' ) {
1247                                 $help['permissions'] = '';
1248                         }
1249                         $help[$k] = $v;
1250                 }
1251                 $help['credits'] = '';
1252
1253                 // Fill 'permissions'
1254                 $help['permissions'] .= Html::openElement( 'div',
1255                         array( 'class' => 'apihelp-block apihelp-permissions' ) );
1256                 $m = $this->msg( 'api-help-permissions' );
1257                 if ( !$m->isDisabled() ) {
1258                         $help['permissions'] .= Html::rawElement( 'div', array( 'class' => 'apihelp-block-head' ),
1259                                 $m->numParams( count( self::$mRights ) )->parse()
1260                         );
1261                 }
1262                 $help['permissions'] .= Html::openElement( 'dl' );
1263                 foreach ( self::$mRights as $right => $rightMsg ) {
1264                         $help['permissions'] .= Html::element( 'dt', null, $right );
1265
1266                         $rightMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )->parse();
1267                         $help['permissions'] .= Html::rawElement( 'dd', null, $rightMsg );
1268
1269                         $groups = array_map( function ( $group ) {
1270                                 return $group == '*' ? 'all' : $group;
1271                         }, User::getGroupsWithPermission( $right ) );
1272
1273                         $help['permissions'] .= Html::rawElement( 'dd', null,
1274                                 $this->msg( 'api-help-permissions-granted-to' )
1275                                         ->numParams( count( $groups ) )
1276                                         ->params( $this->getLanguage()->commaList( $groups ) )
1277                                         ->parse()
1278                         );
1279                 }
1280                 $help['permissions'] .= Html::closeElement( 'dl' );
1281                 $help['permissions'] .= Html::closeElement( 'div' );
1282
1283                 // Fill 'credits', if applicable
1284                 if ( empty( $options['nolead'] ) ) {
1285                         $help['credits'] .= Html::element( 'h' . min( 6, $options['headerlevel'] + 1 ),
1286                                 array( 'id' => '+credits', 'class' => 'apihelp-header' ),
1287                                 $this->msg( 'api-credits-header' )->parse()
1288                         );
1289                         $help['credits'] .= $this->msg( 'api-credits' )->useDatabase( false )->parseAsBlock();
1290                 }
1291         }
1292
1293         private $mCanApiHighLimits = null;
1294
1295         /**
1296          * Check whether the current user is allowed to use high limits
1297          * @return bool
1298          */
1299         public function canApiHighLimits() {
1300                 if ( !isset( $this->mCanApiHighLimits ) ) {
1301                         $this->mCanApiHighLimits = $this->getUser()->isAllowed( 'apihighlimits' );
1302                 }
1303
1304                 return $this->mCanApiHighLimits;
1305         }
1306
1307         /**
1308          * Overrides to return this instance's module manager.
1309          * @return ApiModuleManager
1310          */
1311         public function getModuleManager() {
1312                 return $this->mModuleMgr;
1313         }
1314
1315         /**
1316          * Fetches the user agent used for this request
1317          *
1318          * The value will be the combination of the 'Api-User-Agent' header (if
1319          * any) and the standard User-Agent header (if any).
1320          *
1321          * @return string
1322          */
1323         public function getUserAgent() {
1324                 return trim(
1325                         $this->getRequest()->getHeader( 'Api-user-agent' ) . ' ' .
1326                         $this->getRequest()->getHeader( 'User-agent' )
1327                 );
1328         }
1329
1330         /************************************************************************//**
1331          * @name   Deprecated
1332          * @{
1333          */
1334
1335         /**
1336          * Sets whether the pretty-printer should format *bold* and $italics$
1337          *
1338          * @deprecated since 1.25
1339          * @param bool $help
1340          */
1341         public function setHelp( $help = true ) {
1342                 wfDeprecated( __METHOD__, '1.25' );
1343                 $this->mPrinter->setHelp( $help );
1344         }
1345
1346         /**
1347          * Override the parent to generate help messages for all available modules.
1348          *
1349          * @deprecated since 1.25
1350          * @return string
1351          */
1352         public function makeHelpMsg() {
1353                 wfDeprecated( __METHOD__, '1.25' );
1354                 global $wgMemc;
1355                 $this->setHelp();
1356                 // Get help text from cache if present
1357                 $key = wfMemcKey( 'apihelp', $this->getModuleName(),
1358                         str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
1359
1360                 $cacheHelpTimeout = $this->getConfig()->get( 'APICacheHelpTimeout' );
1361                 if ( $cacheHelpTimeout > 0 ) {
1362                         $cached = $wgMemc->get( $key );
1363                         if ( $cached ) {
1364                                 return $cached;
1365                         }
1366                 }
1367                 $retval = $this->reallyMakeHelpMsg();
1368                 if ( $cacheHelpTimeout > 0 ) {
1369                         $wgMemc->set( $key, $retval, $cacheHelpTimeout );
1370                 }
1371
1372                 return $retval;
1373         }
1374
1375         /**
1376          * @deprecated since 1.25
1377          * @return mixed|string
1378          */
1379         public function reallyMakeHelpMsg() {
1380                 wfDeprecated( __METHOD__, '1.25' );
1381                 $this->setHelp();
1382
1383                 // Use parent to make default message for the main module
1384                 $msg = parent::makeHelpMsg();
1385
1386                 $astriks = str_repeat( '*** ', 14 );
1387                 $msg .= "\n\n$astriks Modules  $astriks\n\n";
1388
1389                 foreach ( $this->mModuleMgr->getNames( 'action' ) as $name ) {
1390                         $module = $this->mModuleMgr->getModule( $name );
1391                         $msg .= self::makeHelpMsgHeader( $module, 'action' );
1392
1393                         $msg2 = $module->makeHelpMsg();
1394                         if ( $msg2 !== false ) {
1395                                 $msg .= $msg2;
1396                         }
1397                         $msg .= "\n";
1398                 }
1399
1400                 $msg .= "\n$astriks Permissions $astriks\n\n";
1401                 foreach ( self::$mRights as $right => $rightMsg ) {
1402                         $rightsMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )
1403                                 ->useDatabase( false )
1404                                 ->inLanguage( 'en' )
1405                                 ->text();
1406                         $groups = User::getGroupsWithPermission( $right );
1407                         $msg .= "* " . $right . " *\n  $rightsMsg" .
1408                                 "\nGranted to:\n  " . str_replace( '*', 'all', implode( ', ', $groups ) ) . "\n\n";
1409                 }
1410
1411                 $msg .= "\n$astriks Formats  $astriks\n\n";
1412                 foreach ( $this->mModuleMgr->getNames( 'format' ) as $name ) {
1413                         $module = $this->mModuleMgr->getModule( $name );
1414                         $msg .= self::makeHelpMsgHeader( $module, 'format' );
1415                         $msg2 = $module->makeHelpMsg();
1416                         if ( $msg2 !== false ) {
1417                                 $msg .= $msg2;
1418                         }
1419                         $msg .= "\n";
1420                 }
1421
1422                 $credits = $this->msg( 'api-credits' )->useDatabase( 'false' )->inLanguage( 'en' )->text();
1423                 $credits = str_replace( "\n", "\n   ", $credits );
1424                 $msg .= "\n*** Credits: ***\n   $credits\n";
1425
1426                 return $msg;
1427         }
1428
1429         /**
1430          * @deprecated since 1.25
1431          * @param ApiBase $module
1432          * @param string $paramName What type of request is this? e.g. action,
1433          *    query, list, prop, meta, format
1434          * @return string
1435          */
1436         public static function makeHelpMsgHeader( $module, $paramName ) {
1437                 wfDeprecated( __METHOD__, '1.25' );
1438                 $modulePrefix = $module->getModulePrefix();
1439                 if ( strval( $modulePrefix ) !== '' ) {
1440                         $modulePrefix = "($modulePrefix) ";
1441                 }
1442
1443                 return "* $paramName={$module->getModuleName()} $modulePrefix*";
1444         }
1445
1446         /**
1447          * Check whether the user wants us to show version information in the API help
1448          * @return bool
1449          * @deprecated since 1.21, always returns false
1450          */
1451         public function getShowVersions() {
1452                 wfDeprecated( __METHOD__, '1.21' );
1453
1454                 return false;
1455         }
1456
1457         /**
1458          * Add or overwrite a module in this ApiMain instance. Intended for use by extending
1459          * classes who wish to add their own modules to their lexicon or override the
1460          * behavior of inherent ones.
1461          *
1462          * @deprecated since 1.21, Use getModuleManager()->addModule() instead.
1463          * @param string $name The identifier for this module.
1464          * @param ApiBase $class The class where this module is implemented.
1465          */
1466         protected function addModule( $name, $class ) {
1467                 $this->getModuleManager()->addModule( $name, 'action', $class );
1468         }
1469
1470         /**
1471          * Add or overwrite an output format for this ApiMain. Intended for use by extending
1472          * classes who wish to add to or modify current formatters.
1473          *
1474          * @deprecated since 1.21, Use getModuleManager()->addModule() instead.
1475          * @param string $name The identifier for this format.
1476          * @param ApiFormatBase $class The class implementing this format.
1477          */
1478         protected function addFormat( $name, $class ) {
1479                 $this->getModuleManager()->addModule( $name, 'format', $class );
1480         }
1481
1482         /**
1483          * Get the array mapping module names to class names
1484          * @deprecated since 1.21, Use getModuleManager()'s methods instead.
1485          * @return array
1486          */
1487         function getModules() {
1488                 return $this->getModuleManager()->getNamesWithClasses( 'action' );
1489         }
1490
1491         /**
1492          * Returns the list of supported formats in form ( 'format' => 'ClassName' )
1493          *
1494          * @since 1.18
1495          * @deprecated since 1.21, Use getModuleManager()'s methods instead.
1496          * @return array
1497          */
1498         public function getFormats() {
1499                 return $this->getModuleManager()->getNamesWithClasses( 'format' );
1500         }
1501
1502         /**@}*/
1503
1504 }
1505
1506 /**
1507  * This exception will be thrown when dieUsage is called to stop module execution.
1508  *
1509  * @ingroup API
1510  */
1511 class UsageException extends MWException {
1512
1513         private $mCodestr;
1514
1515         /**
1516          * @var null|array
1517          */
1518         private $mExtraData;
1519
1520         /**
1521          * @param string $message
1522          * @param string $codestr
1523          * @param int $code
1524          * @param array|null $extradata
1525          */
1526         public function __construct( $message, $codestr, $code = 0, $extradata = null ) {
1527                 parent::__construct( $message, $code );
1528                 $this->mCodestr = $codestr;
1529                 $this->mExtraData = $extradata;
1530         }
1531
1532         /**
1533          * @return string
1534          */
1535         public function getCodeString() {
1536                 return $this->mCodestr;
1537         }
1538
1539         /**
1540          * @return array
1541          */
1542         public function getMessageArray() {
1543                 $result = array(
1544                         'code' => $this->mCodestr,
1545                         'info' => $this->getMessage()
1546                 );
1547                 if ( is_array( $this->mExtraData ) ) {
1548                         $result = array_merge( $result, $this->mExtraData );
1549                 }
1550
1551                 return $result;
1552         }
1553
1554         /**
1555          * @return string
1556          */
1557         public function __toString() {
1558                 return "{$this->getCodeString()}: {$this->getMessage()}";
1559         }
1560 }
1561
1562 /**
1563  * For really cool vim folding this needs to be at the end:
1564  * vim: foldmarker=@{,@} foldmethod=marker
1565  */