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                 'checktoken' => 'ApiCheckToken',
  68
  69                 // Write modules
  70                 'purge' => 'ApiPurge',
  71                 'setnotificationtimestamp' => 'ApiSetNotificationTimestamp',
  72                 'rollback' => 'ApiRollback',
  73                 'delete' => 'ApiDelete',
  74                 'undelete' => 'ApiUndelete',
  75                 'protect' => 'ApiProtect',
  76                 'block' => 'ApiBlock',
  77                 'unblock' => 'ApiUnblock',
  78                 'move' => 'ApiMove',
  79                 'edit' => 'ApiEditPage',
  80                 'upload' => 'ApiUpload',
  81                 'filerevert' => 'ApiFileRevert',
  82                 'emailuser' => 'ApiEmailUser',
  83                 'watch' => 'ApiWatch',
  84                 'patrol' => 'ApiPatrol',
  85                 'import' => 'ApiImport',
  86                 'clearhasmsg' => 'ApiClearHasMsg',
  87                 'userrights' => 'ApiUserrights',
  88                 'options' => 'ApiOptions',
  89                 'imagerotate' => 'ApiImageRotate',
  90                 'revisiondelete' => 'ApiRevisionDelete',
  91                 'managetags' => 'ApiManageTags',
  92         );
  93
  94         /**
  95          * List of available formats: format name => format class
  96          */
  97         private static $Formats = array(
  98                 'json' => 'ApiFormatJson',
  99                 'jsonfm' => 'ApiFormatJson',
 100                 'php' => 'ApiFormatPhp',
 101                 'phpfm' => 'ApiFormatPhp',
 102                 'wddx' => 'ApiFormatWddx',
 103                 'wddxfm' => 'ApiFormatWddx',
 104                 'xml' => 'ApiFormatXml',
 105                 'xmlfm' => 'ApiFormatXml',
 106                 'yaml' => 'ApiFormatYaml',
 107                 'yamlfm' => 'ApiFormatYaml',
 108                 'rawfm' => 'ApiFormatJson',
 109                 'txt' => 'ApiFormatTxt',
 110                 'txtfm' => 'ApiFormatTxt',
 111                 'dbg' => 'ApiFormatDbg',
 112                 'dbgfm' => 'ApiFormatDbg',
 113                 'dump' => 'ApiFormatDump',
 114                 'dumpfm' => 'ApiFormatDump',
 115                 'none' => 'ApiFormatNone',
 116         );
 117
 118         // @codingStandardsIgnoreStart String contenation on "msg" not allowed to break long line
 119         /**
 120          * List of user roles that are specifically relevant to the API.
 121          * array( 'right' => array ( 'msg'    => 'Some message with a $1',
 122          *                           'params' => array ( $someVarToSubst ) ),
 123          *                          );
 124          */
 125         private static $mRights = array(
 126                 'writeapi' => array(
 127                         'msg' => 'right-writeapi',
 128                         'params' => array()
 129                 ),
 130                 'apihighlimits' => array(
 131                         'msg' => 'api-help-right-apihighlimits',
 132                         'params' => array( ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 )
 133                 )
 134         );
 135         // @codingStandardsIgnoreEnd
 136
 137         /**
 138          * @var ApiFormatBase
 139          */
 140         private $mPrinter;
 141
 142         private $mModuleMgr, $mResult;
 143         private $mAction;
 144         private $mEnableWrite;
 145         private $mInternalMode, $mSquidMaxage, $mModule;
 146
 147         private $mCacheMode = 'private';
 148         private $mCacheControl = array();
 149         private $mParamsUsed = array();
 150
 151         /**
 152          * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
 153          *
 154          * @param IContextSource|WebRequest $context If this is an instance of
 155          *    FauxRequest, errors are thrown and no printing occurs
 156          * @param bool $enableWrite Should be set to true if the api may modify data
 157          */
 158         public function __construct( $context = null, $enableWrite = false ) {
 159                 if ( $context === null ) {
 160                         $context = RequestContext::getMain();
 161                 } elseif ( $context instanceof WebRequest ) {
 162                         // BC for pre-1.19
 163                         $request = $context;
 164                         $context = RequestContext::getMain();
 165                 }
 166                 // We set a derivative context so we can change stuff later
 167                 $this->setContext( new DerivativeContext( $context ) );
 168
 169                 if ( isset( $request ) ) {
 170                         $this->getContext()->setRequest( $request );
 171                 }
 172
 173                 $this->mInternalMode = ( $this->getRequest() instanceof FauxRequest );
 174
 175                 // Special handling for the main module: $parent === $this
 176                 parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
 177
 178                 if ( !$this->mInternalMode ) {
 179                         // Impose module restrictions.
 180                         // If the current user cannot read,
 181                         // Remove all modules other than login
 182                         global $wgUser;
 183
 184                         if ( $this->lacksSameOriginSecurity() ) {
 185                                 // If we're in a mode that breaks the same-origin policy, strip
 186                                 // user credentials for security.
 187                                 wfDebug( "API: stripping user credentials when the same-origin policy is not applied\n" );
 188                                 $wgUser = new User();
 189                                 $this->getContext()->setUser( $wgUser );
 190                         }
 191                 }
 192
 193                 $uselang = $this->getParameter( 'uselang' );
 194                 if ( $uselang === 'user' ) {
 195                         // Assume the parent context is going to return the user language
 196                         // for uselang=user (see T85635).
 197                 } else {
 198                         if ( $uselang === 'content' ) {
 199                                 global $wgContLang;
 200                                 $uselang = $wgContLang->getCode();
 201                         }
 202                         $code = RequestContext::sanitizeLangCode( $uselang );
 203                         $this->getContext()->setLanguage( $code );
 204                         if ( !$this->mInternalMode ) {
 205                                 global $wgLang;
 206                                 $wgLang = $this->getContext()->getLanguage();
 207                                 RequestContext::getMain()->setLanguage( $wgLang );
 208                         }
 209                 }
 210
 211                 $config = $this->getConfig();
 212                 $this->mModuleMgr = new ApiModuleManager( $this );
 213                 $this->mModuleMgr->addModules( self::$Modules, 'action' );
 214                 $this->mModuleMgr->addModules( $config->get( 'APIModules' ), 'action' );
 215                 $this->mModuleMgr->addModules( self::$Formats, 'format' );
 216                 $this->mModuleMgr->addModules( $config->get( 'APIFormatModules' ), 'format' );
 217
 218                 Hooks::run( 'ApiMain::moduleManager', array( $this->mModuleMgr ) );
 219
 220                 $this->mResult = new ApiResult( $this );
 221                 $this->mEnableWrite = $enableWrite;
 222
 223                 $this->mSquidMaxage = -1; // flag for executeActionWithErrorHandling()
 224                 $this->mCommit = false;
 225         }
 226
 227         /**
 228          * Return true if the API was started by other PHP code using FauxRequest
 229          * @return bool
 230          */
 231         public function isInternalMode() {
 232                 return $this->mInternalMode;
 233         }
 234
 235         /**
 236          * Get the ApiResult object associated with current request
 237          *
 238          * @return ApiResult
 239          */
 240         public function getResult() {
 241                 return $this->mResult;
 242         }
 243
 244         /**
 245          * Get the API module object. Only works after executeAction()
 246          *
 247          * @return ApiBase
 248          */
 249         public function getModule() {
 250                 return $this->mModule;
 251         }
 252
 253         /**
 254          * Get the result formatter object. Only works after setupExecuteAction()
 255          *
 256          * @return ApiFormatBase
 257          */
 258         public function getPrinter() {
 259                 return $this->mPrinter;
 260         }
 261
 262         /**
 263          * Set how long the response should be cached.
 264          *
 265          * @param int $maxage
 266          */
 267         public function setCacheMaxAge( $maxage ) {
 268                 $this->setCacheControl( array(
 269                         'max-age' => $maxage,
 270                         's-maxage' => $maxage
 271                 ) );
 272         }
 273
 274         /**
 275          * Set the type of caching headers which will be sent.
 276          *
 277          * @param string $mode One of:
 278          *    - 'public':     Cache this object in public caches, if the maxage or smaxage
 279          *         parameter is set, or if setCacheMaxAge() was called. If a maximum age is
 280          *         not provided by any of these means, the object will be private.
 281          *    - 'private':    Cache this object only in private client-side caches.
 282          *    - 'anon-public-user-private': Make this object cacheable for logged-out
 283          *         users, but private for logged-in users. IMPORTANT: If this is set, it must be
 284          *         set consistently for a given URL, it cannot be set differently depending on
 285          *         things like the contents of the database, or whether the user is logged in.
 286          *
 287          *  If the wiki does not allow anonymous users to read it, the mode set here
 288          *  will be ignored, and private caching headers will always be sent. In other words,
 289          *  the "public" mode is equivalent to saying that the data sent is as public as a page
 290          *  view.
 291          *
 292          *  For user-dependent data, the private mode should generally be used. The
 293          *  anon-public-user-private mode should only be used where there is a particularly
 294          *  good performance reason for caching the anonymous response, but where the
 295          *  response to logged-in users may differ, or may contain private data.
 296          *
 297          *  If this function is never called, then the default will be the private mode.
 298          */
 299         public function setCacheMode( $mode ) {
 300                 if ( !in_array( $mode, array( 'private', 'public', 'anon-public-user-private' ) ) ) {
 301                         wfDebug( __METHOD__ . ": unrecognised cache mode \"$mode\"\n" );
 302
 303                         // Ignore for forwards-compatibility
 304                         return;
 305                 }
 306
 307                 if ( !User::isEveryoneAllowed( 'read' ) ) {
 308                         // Private wiki, only private headers
 309                         if ( $mode !== 'private' ) {
 310                                 wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki\n" );
 311
 312                                 return;
 313                         }
 314                 }
 315
 316                 if ( $mode === 'public' && $this->getParameter( 'uselang' ) === 'user' ) {
 317                         // User language is used for i18n, so we don't want to publicly
 318                         // cache. Anons are ok, because if they have non-default language
 319                         // then there's an appropriate Vary header set by whatever set
 320                         // their non-default language.
 321                         wfDebug( __METHOD__ . ": downgrading cache mode 'public' to " .
 322                                 "'anon-public-user-private' due to uselang=user\n" );
 323                         $mode = 'anon-public-user-private';
 324                 }
 325
 326                 wfDebug( __METHOD__ . ": setting cache mode $mode\n" );
 327                 $this->mCacheMode = $mode;
 328         }
 329
 330         /**
 331          * Set directives (key/value pairs) for the Cache-Control header.
 332          * Boolean values will be formatted as such, by including or omitting
 333          * without an equals sign.
 334          *
 335          * Cache control values set here will only be used if the cache mode is not
 336          * private, see setCacheMode().
 337          *
 338          * @param array $directives
 339          */
 340         public function setCacheControl( $directives ) {
 341                 $this->mCacheControl = $directives + $this->mCacheControl;
 342         }
 343
 344         /**
 345          * Create an instance of an output formatter by its name
 346          *
 347          * @param string $format
 348          *
 349          * @return ApiFormatBase
 350          */
 351         public function createPrinterByName( $format ) {
 352                 $printer = $this->mModuleMgr->getModule( $format, 'format' );
 353                 if ( $printer === null ) {
 354                         $this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
 355                 }
 356
 357                 return $printer;
 358         }
 359
 360         /**
 361          * Execute api request. Any errors will be handled if the API was called by the remote client.
 362          */
 363         public function execute() {
 364                 $this->profileIn();
 365                 if ( $this->mInternalMode ) {
 366                         $this->executeAction();
 367                 } else {
 368                         $this->executeActionWithErrorHandling();
 369                 }
 370
 371                 $this->profileOut();
 372         }
 373
 374         /**
 375          * Execute an action, and in case of an error, erase whatever partial results
 376          * have been accumulated, and replace it with an error message and a help screen.
 377          */
 378         protected function executeActionWithErrorHandling() {
 379                 // Verify the CORS header before executing the action
 380                 if ( !$this->handleCORS() ) {
 381                         // handleCORS() has sent a 403, abort
 382                         return;
 383                 }
 384
 385                 // Exit here if the request method was OPTIONS
 386                 // (assume there will be a followup GET or POST)
 387                 if ( $this->getRequest()->getMethod() === 'OPTIONS' ) {
 388                         return;
 389                 }
 390
 391                 // In case an error occurs during data output,
 392                 // clear the output buffer and print just the error information
 393                 ob_start();
 394
 395                 $t = microtime( true );
 396                 try {
 397                         $this->executeAction();
 398                 } catch ( Exception $e ) {
 399                         $this->handleException( $e );
 400                 }
 401
 402                 // Log the request whether or not there was an error
 403                 $this->logRequest( microtime( true ) - $t );
 404
 405                 // Send cache headers after any code which might generate an error, to
 406                 // avoid sending public cache headers for errors.
 407                 $this->sendCacheHeaders();
 408
 409                 ob_end_flush();
 410         }
 411
 412         /**
 413          * Handle an exception as an API response
 414          *
 415          * @since 1.23
 416          * @param Exception $e
 417          */
 418         protected function handleException( Exception $e ) {
 419                 // Bug 63145: Rollback any open database transactions
 420                 if ( !( $e instanceof UsageException ) ) {
 421                         // UsageExceptions are intentional, so don't rollback if that's the case
 422                         MWExceptionHandler::rollbackMasterChangesAndLog( $e );
 423                 }
 424
 425                 // Allow extra cleanup and logging
 426                 Hooks::run( 'ApiMain::onException', array( $this, $e ) );
 427
 428                 // Log it
 429                 if ( !( $e instanceof UsageException ) ) {
 430                         MWExceptionHandler::logException( $e );
 431                 }
 432
 433                 // Handle any kind of exception by outputting properly formatted error message.
 434                 // If this fails, an unhandled exception should be thrown so that global error
 435                 // handler will process and log it.
 436
 437                 $errCode = $this->substituteResultWithError( $e );
 438
 439                 // Error results should not be cached
 440                 $this->setCacheMode( 'private' );
 441
 442                 $response = $this->getRequest()->response();
 443                 $headerStr = 'MediaWiki-API-Error: ' . $errCode;
 444                 if ( $e->getCode() === 0 ) {
 445                         $response->header( $headerStr );
 446                 } else {
 447                         $response->header( $headerStr, true, $e->getCode() );
 448                 }
 449
 450                 // Reset and print just the error message
 451                 ob_clean();
 452
 453                 // If the error occurred during printing, do a printer->profileOut()
 454                 $this->mPrinter->safeProfileOut();
 455                 $this->printResult( true );
 456         }
 457
 458         /**
 459          * Handle an exception from the ApiBeforeMain hook.
 460          *
 461          * This tries to print the exception as an API response, to be more
 462          * friendly to clients. If it fails, it will rethrow the exception.
 463          *
 464          * @since 1.23
 465          * @param Exception $e
 466          * @throws Exception
 467          */
 468         public static function handleApiBeforeMainException( Exception $e ) {
 469                 ob_start();
 470
 471                 try {
 472                         $main = new self( RequestContext::getMain(), false );
 473                         $main->handleException( $e );
 474                 } catch ( Exception $e2 ) {
 475                         // Nope, even that didn't work. Punt.
 476                         throw $e;
 477                 }
 478
 479                 // Log the request and reset cache headers
 480                 $main->logRequest( 0 );
 481                 $main->sendCacheHeaders();
 482
 483                 ob_end_flush();
 484         }
 485
 486         /**
 487          * Check the &origin= query parameter against the Origin: HTTP header and respond appropriately.
 488          *
 489          * If no origin parameter is present, nothing happens.
 490          * If an origin parameter is present but doesn't match the Origin header, a 403 status code
 491          * is set and false is returned.
 492          * If the parameter and the header do match, the header is checked against $wgCrossSiteAJAXdomains
 493          * and $wgCrossSiteAJAXdomainExceptions, and if the origin qualifies, the appropriate CORS
 494          * headers are set.
 495          * http://www.w3.org/TR/cors/#resource-requests
 496          * http://www.w3.org/TR/cors/#resource-preflight-requests
 497          *
 498          * @return bool False if the caller should abort (403 case), true otherwise (all other cases)
 499          */
 500         protected function handleCORS() {
 501                 $originParam = $this->getParameter( 'origin' ); // defaults to null
 502                 if ( $originParam === null ) {
 503                         // No origin parameter, nothing to do
 504                         return true;
 505                 }
 506
 507                 $request = $this->getRequest();
 508                 $response = $request->response();
 509
 510                 // Origin: header is a space-separated list of origins, check all of them
 511                 $originHeader = $request->getHeader( 'Origin' );
 512                 if ( $originHeader === false ) {
 513                         $origins = array();
 514                 } else {
 515                         $originHeader = trim( $originHeader );
 516                         $origins = preg_split( '/\s+/', $originHeader );
 517                 }
 518
 519                 if ( !in_array( $originParam, $origins ) ) {
 520                         // origin parameter set but incorrect
 521                         // Send a 403 response
 522                         $message = HttpStatus::getMessage( 403 );
 523                         $response->header( "HTTP/1.1 403 $message", true, 403 );
 524                         $response->header( 'Cache-Control: no-cache' );
 525                         echo "'origin' parameter does not match Origin header\n";
 526
 527                         return false;
 528                 }
 529
 530                 $config = $this->getConfig();
 531                 $matchOrigin = count( $origins ) === 1 && self::matchOrigin(
 532                         $originParam,
 533                         $config->get( 'CrossSiteAJAXdomains' ),
 534                         $config->get( 'CrossSiteAJAXdomainExceptions' )
 535                 );
 536
 537                 if ( $matchOrigin ) {
 538                         $requestedMethod = $request->getHeader( 'Access-Control-Request-Method' );
 539                         $preflight = $request->getMethod() === 'OPTIONS' && $requestedMethod !== false;
 540                         if ( $preflight ) {
 541                                 // This is a CORS preflight request
 542                                 if ( $requestedMethod !== 'POST' && $requestedMethod !== 'GET' ) {
 543                                         // If method is not a case-sensitive match, do not set any additional headers and terminate.
 544                                         return true;
 545                                 }
 546                                 // We allow the actual request to send the following headers
 547                                 $requestedHeaders = $request->getHeader( 'Access-Control-Request-Headers' );
 548                                 if ( $requestedHeaders !== false ) {
 549                                         if ( !self::matchRequestedHeaders( $requestedHeaders ) ) {
 550                                                 return true;
 551                                         }
 552                                         $response->header( 'Access-Control-Allow-Headers: ' . $requestedHeaders );
 553                                 }
 554
 555                                 // We only allow the actual request to be GET or POST
 556                                 $response->header( 'Access-Control-Allow-Methods: POST, GET' );
 557                         }
 558
 559                         $response->header( "Access-Control-Allow-Origin: $originHeader" );
 560                         $response->header( 'Access-Control-Allow-Credentials: true' );
 561                         $response->header( "Timing-Allow-Origin: $originHeader" ); # http://www.w3.org/TR/resource-timing/#timing-allow-origin
 562
 563                         if ( !$preflight ) {
 564                                 $response->header( 'Access-Control-Expose-Headers: MediaWiki-API-Error, Retry-After, X-Database-Lag' );
 565                         }
 566                 }
 567
 568                 $this->getOutput()->addVaryHeader( 'Origin' );
 569                 return true;
 570         }
 571
 572         /**
 573          * Attempt to match an Origin header against a set of rules and a set of exceptions
 574          * @param string $value Origin header
 575          * @param array $rules Set of wildcard rules
 576          * @param array $exceptions Set of wildcard rules
 577          * @return bool True if $value matches a rule in $rules and doesn't match
 578          *    any rules in $exceptions, false otherwise
 579          */
 580         protected static function matchOrigin( $value, $rules, $exceptions ) {
 581                 foreach ( $rules as $rule ) {
 582                         if ( preg_match( self::wildcardToRegex( $rule ), $value ) ) {
 583                                 // Rule matches, check exceptions
 584                                 foreach ( $exceptions as $exc ) {
 585                                         if ( preg_match( self::wildcardToRegex( $exc ), $value ) ) {
 586                                                 return false;
 587                                         }
 588                                 }
 589
 590                                 return true;
 591                         }
 592                 }
 593
 594                 return false;
 595         }
 596
 597         /**
 598          * Attempt to validate the value of Access-Control-Request-Headers against a list
 599          * of headers that we allow the follow up request to send.
 600          *
 601          * @param string $requestedHeaders Comma seperated list of HTTP headers
 602          * @return bool True if all requested headers are in the list of allowed headers
 603          */
 604         protected static function matchRequestedHeaders( $requestedHeaders ) {
 605                 if ( trim( $requestedHeaders ) === '' ) {
 606                         return true;
 607                 }
 608                 $requestedHeaders = explode( ',', $requestedHeaders );
 609                 $allowedAuthorHeaders = array_flip( array(
 610                         /* simple headers (see spec) */
 611                         'accept',
 612                         'accept-language',
 613                         'content-language',
 614                         'content-type',
 615                         /* non-authorable headers in XHR, which are however requested by some UAs */
 616                         'accept-encoding',
 617                         'dnt',
 618                         'origin',
 619                         /* MediaWiki whitelist */
 620                         'api-user-agent',
 621                 ) );
 622                 foreach ( $requestedHeaders as $rHeader ) {
 623                         $rHeader = strtolower( trim( $rHeader ) );
 624                         if ( !isset( $allowedAuthorHeaders[$rHeader] ) ) {
 625                                 wfDebugLog( 'api', 'CORS preflight failed on requested header: ' . $rHeader );
 626                                 return false;
 627                         }
 628                 }
 629                 return true;
 630         }
 631
 632         /**
 633          * Helper function to convert wildcard string into a regex
 634          * '*' => '.*?'
 635          * '?' => '.'
 636          *
 637          * @param string $wildcard String with wildcards
 638          * @return string Regular expression
 639          */
 640         protected static function wildcardToRegex( $wildcard ) {
 641                 $wildcard = preg_quote( $wildcard, '/' );
 642                 $wildcard = str_replace(
 643                         array( '\*', '\?' ),
 644                         array( '.*?', '.' ),
 645                         $wildcard
 646                 );
 647
 648                 return "/^https?:\/\/$wildcard$/";
 649         }
 650
 651         protected function sendCacheHeaders() {
 652                 $response = $this->getRequest()->response();
 653                 $out = $this->getOutput();
 654
 655                 $config = $this->getConfig();
 656
 657                 if ( $config->get( 'VaryOnXFP' ) ) {
 658                         $out->addVaryHeader( 'X-Forwarded-Proto' );
 659                 }
 660
 661                 if ( $this->mCacheMode == 'private' ) {
 662                         $response->header( 'Cache-Control: private' );
 663                         return;
 664                 }
 665
 666                 $useXVO = $config->get( 'UseXVO' );
 667                 if ( $this->mCacheMode == 'anon-public-user-private' ) {
 668                         $out->addVaryHeader( 'Cookie' );
 669                         $response->header( $out->getVaryHeader() );
 670                         if ( $useXVO ) {
 671                                 $response->header( $out->getXVO() );
 672                                 if ( $out->haveCacheVaryCookies() ) {
 673                                         // Logged in, mark this request private
 674                                         $response->header( 'Cache-Control: private' );
 675                                         return;
 676                                 }
 677                                 // Logged out, send normal public headers below
 678                         } elseif ( session_id() != '' ) {
 679                                 // Logged in or otherwise has session (e.g. anonymous users who have edited)
 680                                 // Mark request private
 681                                 $response->header( 'Cache-Control: private' );
 682
 683                                 return;
 684                         } // else no XVO and anonymous, send public headers below
 685                 }
 686
 687                 // Send public headers
 688                 $response->header( $out->getVaryHeader() );
 689                 if ( $useXVO ) {
 690                         $response->header( $out->getXVO() );
 691                 }
 692
 693                 // If nobody called setCacheMaxAge(), use the (s)maxage parameters
 694                 if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
 695                         $this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
 696                 }
 697                 if ( !isset( $this->mCacheControl['max-age'] ) ) {
 698                         $this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
 699                 }
 700
 701                 if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
 702                         // Public cache not requested
 703                         // Sending a Vary header in this case is harmless, and protects us
 704                         // against conditional calls of setCacheMaxAge().
 705                         $response->header( 'Cache-Control: private' );
 706
 707                         return;
 708                 }
 709
 710                 $this->mCacheControl['public'] = true;
 711
 712                 // Send an Expires header
 713                 $maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
 714                 $expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
 715                 $response->header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );
 716
 717                 // Construct the Cache-Control header
 718                 $ccHeader = '';
 719                 $separator = '';
 720                 foreach ( $this->mCacheControl as $name => $value ) {
 721                         if ( is_bool( $value ) ) {
 722                                 if ( $value ) {
 723                                         $ccHeader .= $separator . $name;
 724                                         $separator = ', ';
 725                                 }
 726                         } else {
 727                                 $ccHeader .= $separator . "$name=$value";
 728                                 $separator = ', ';
 729                         }
 730                 }
 731
 732                 $response->header( "Cache-Control: $ccHeader" );
 733         }
 734
 735         /**
 736          * Replace the result data with the information about an exception.
 737          * Returns the error code
 738          * @param Exception $e
 739          * @return string
 740          */
 741         protected function substituteResultWithError( $e ) {
 742                 $result = $this->getResult();
 743
 744                 // Printer may not be initialized if the extractRequestParams() fails for the main module
 745                 if ( !isset( $this->mPrinter ) ) {
 746                         // The printer has not been created yet. Try to manually get formatter value.
 747                         $value = $this->getRequest()->getVal( 'format', self::API_DEFAULT_FORMAT );
 748                         if ( !$this->mModuleMgr->isDefined( $value, 'format' ) ) {
 749                                 $value = self::API_DEFAULT_FORMAT;
 750                         }
 751
 752                         $this->mPrinter = $this->createPrinterByName( $value );
 753                 }
 754
 755                 // Printer may not be able to handle errors. This is particularly
 756                 // likely if the module returns something for getCustomPrinter().
 757                 if ( !$this->mPrinter->canPrintErrors() ) {
 758                         $this->mPrinter->safeProfileOut();
 759                         $this->mPrinter = $this->createPrinterByName( self::API_DEFAULT_FORMAT );
 760                 }
 761
 762                 // Update raw mode flag for the selected printer.
 763                 $result->setRawMode( $this->mPrinter->getNeedsRawData() );
 764
 765                 $config = $this->getConfig();
 766
 767                 if ( $e instanceof UsageException ) {
 768                         // User entered incorrect parameters - generate error response
 769                         $errMessage = $e->getMessageArray();
 770                         $link = wfExpandUrl( wfScript( 'api' ) );
 771                         ApiResult::setContent( $errMessage, "See $link for API usage" );
 772                 } else {
 773                         // Something is seriously wrong
 774                         if ( ( $e instanceof DBQueryError ) && !$config->get( 'ShowSQLErrors' ) ) {
 775                                 $info = 'Database query error';
 776                         } else {
 777                                 $info = "Exception Caught: {$e->getMessage()}";
 778                         }
 779
 780                         $errMessage = array(
 781                                 'code' => 'internal_api_error_' . get_class( $e ),
 782                                 'info' => '[' . MWExceptionHandler::getLogId( $e ) . '] ' . $info,
 783                         );
 784                         if ( $config->get( 'ShowExceptionDetails' ) ) {
 785                                 ApiResult::setContent(
 786                                         $errMessage,
 787                                         MWExceptionHandler::getRedactedTraceAsString( $e )
 788                                 );
 789                         }
 790                 }
 791
 792                 // Remember all the warnings to re-add them later
 793                 $oldResult = $result->getData();
 794                 $warnings = isset( $oldResult['warnings'] ) ? $oldResult['warnings'] : null;
 795
 796                 $result->reset();
 797                 // Re-add the id
 798                 $requestid = $this->getParameter( 'requestid' );
 799                 if ( !is_null( $requestid ) ) {
 800                         $result->addValue( null, 'requestid', $requestid, ApiResult::NO_SIZE_CHECK );
 801                 }
 802                 if ( $config->get( 'ShowHostnames' ) ) {
 803                         // servedby is especially useful when debugging errors
 804                         $result->addValue( null, 'servedby', wfHostName(), ApiResult::NO_SIZE_CHECK );
 805                 }
 806                 if ( $warnings !== null ) {
 807                         $result->addValue( null, 'warnings', $warnings, ApiResult::NO_SIZE_CHECK );
 808                 }
 809
 810                 $result->addValue( null, 'error', $errMessage, ApiResult::NO_SIZE_CHECK );
 811
 812                 return $errMessage['code'];
 813         }
 814
 815         /**
 816          * Set up for the execution.
 817          * @return array
 818          */
 819         protected function setupExecuteAction() {
 820                 // First add the id to the top element
 821                 $result = $this->getResult();
 822                 $requestid = $this->getParameter( 'requestid' );
 823                 if ( !is_null( $requestid ) ) {
 824                         $result->addValue( null, 'requestid', $requestid );
 825                 }
 826
 827                 if ( $this->getConfig()->get( 'ShowHostnames' ) ) {
 828                         $servedby = $this->getParameter( 'servedby' );
 829                         if ( $servedby ) {
 830                                 $result->addValue( null, 'servedby', wfHostName() );
 831                         }
 832                 }
 833
 834                 if ( $this->getParameter( 'curtimestamp' ) ) {
 835                         $result->addValue( null, 'curtimestamp', wfTimestamp( TS_ISO_8601, time() ),
 836                                 ApiResult::NO_SIZE_CHECK );
 837                 }
 838
 839                 $params = $this->extractRequestParams();
 840
 841                 $this->mAction = $params['action'];
 842
 843                 if ( !is_string( $this->mAction ) ) {
 844                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 845                 }
 846
 847                 return $params;
 848         }
 849
 850         /**
 851          * Set up the module for response
 852          * @return ApiBase The module that will handle this action
 853          * @throws MWException
 854          * @throws UsageException
 855          */
 856         protected function setupModule() {
 857                 // Instantiate the module requested by the user
 858                 $module = $this->mModuleMgr->getModule( $this->mAction, 'action' );
 859                 if ( $module === null ) {
 860                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 861                 }
 862                 $moduleParams = $module->extractRequestParams();
 863
 864                 // Check token, if necessary
 865                 if ( $module->needsToken() === true ) {
 866                         throw new MWException(
 867                                 "Module '{$module->getModuleName()}' must be updated for the new token handling. " .
 868                                 "See documentation for ApiBase::needsToken for details."
 869                         );
 870                 }
 871                 if ( $module->needsToken() ) {
 872                         if ( !$module->mustBePosted() ) {
 873                                 throw new MWException(
 874                                         "Module '{$module->getModuleName()}' must require POST to use tokens."
 875                                 );
 876                         }
 877
 878                         if ( !isset( $moduleParams['token'] ) ) {
 879                                 $this->dieUsageMsg( array( 'missingparam', 'token' ) );
 880                         }
 881
 882                         if ( !$this->getConfig()->get( 'DebugAPI' ) &&
 883                                 array_key_exists(
 884                                         $module->encodeParamName( 'token' ),
 885                                         $this->getRequest()->getQueryValues()
 886                                 )
 887                         ) {
 888                                 $this->dieUsage(
 889                                         "The '{$module->encodeParamName( 'token' )}' parameter was found in the query string, but must be in the POST body",
 890                                         'mustposttoken'
 891                                 );
 892                         }
 893
 894                         if ( !$module->validateToken( $moduleParams['token'], $moduleParams ) ) {
 895                                 $this->dieUsageMsg( 'sessionfailure' );
 896                         }
 897                 }
 898
 899                 return $module;
 900         }
 901
 902         /**
 903          * Check the max lag if necessary
 904          * @param ApiBase $module Api module being used
 905          * @param array $params Array an array containing the request parameters.
 906          * @return bool True on success, false should exit immediately
 907          */
 908         protected function checkMaxLag( $module, $params ) {
 909                 if ( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
 910                         // Check for maxlag
 911                         $maxLag = $params['maxlag'];
 912                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 913                         if ( $lag > $maxLag ) {
 914                                 $response = $this->getRequest()->response();
 915
 916                                 $response->header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 917                                 $response->header( 'X-Database-Lag: ' . intval( $lag ) );
 918
 919                                 if ( $this->getConfig()->get( 'ShowHostnames' ) ) {
 920                                         $this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
 921                                 }
 922
 923                                 $this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
 924                         }
 925                 }
 926
 927                 return true;
 928         }
 929
 930         /**
 931          * Check for sufficient permissions to execute
 932          * @param ApiBase $module An Api module
 933          */
 934         protected function checkExecutePermissions( $module ) {
 935                 $user = $this->getUser();
 936                 if ( $module->isReadMode() && !User::isEveryoneAllowed( 'read' ) &&
 937                         !$user->isAllowed( 'read' )
 938                 ) {
 939                         $this->dieUsageMsg( 'readrequired' );
 940                 }
 941                 if ( $module->isWriteMode() ) {
 942                         if ( !$this->mEnableWrite ) {
 943                                 $this->dieUsageMsg( 'writedisabled' );
 944                         }
 945                         if ( !$user->isAllowed( 'writeapi' ) ) {
 946                                 $this->dieUsageMsg( 'writerequired' );
 947                         }
 948                         if ( wfReadOnly() ) {
 949                                 $this->dieReadOnly();
 950                         }
 951                 }
 952
 953                 // Allow extensions to stop execution for arbitrary reasons.
 954                 $message = false;
 955                 if ( !Hooks::run( 'ApiCheckCanExecute', array( $module, $user, &$message ) ) ) {
 956                         $this->dieUsageMsg( $message );
 957                 }
 958         }
 959
 960         /**
 961          * Check asserts of the user's rights
 962          * @param array $params
 963          */
 964         protected function checkAsserts( $params ) {
 965                 if ( isset( $params['assert'] ) ) {
 966                         $user = $this->getUser();
 967                         switch ( $params['assert'] ) {
 968                                 case 'user':
 969                                         if ( $user->isAnon() ) {
 970                                                 $this->dieUsage( 'Assertion that the user is logged in failed', 'assertuserfailed' );
 971                                         }
 972                                         break;
 973                                 case 'bot':
 974                                         if ( !$user->isAllowed( 'bot' ) ) {
 975                                                 $this->dieUsage( 'Assertion that the user has the bot right failed', 'assertbotfailed' );
 976                                         }
 977                                         break;
 978                         }
 979                 }
 980         }
 981
 982         /**
 983          * Check POST for external response and setup result printer
 984          * @param ApiBase $module An Api module
 985          * @param array $params An array with the request parameters
 986          */
 987         protected function setupExternalResponse( $module, $params ) {
 988                 if ( !$this->getRequest()->wasPosted() && $module->mustBePosted() ) {
 989                         // Module requires POST. GET request might still be allowed
 990                         // if $wgDebugApi is true, otherwise fail.
 991                         $this->dieUsageMsgOrDebug( array( 'mustbeposted', $this->mAction ) );
 992                 }
 993
 994                 // See if custom printer is used
 995                 $this->mPrinter = $module->getCustomPrinter();
 996                 if ( is_null( $this->mPrinter ) ) {
 997                         // Create an appropriate printer
 998                         $this->mPrinter = $this->createPrinterByName( $params['format'] );
 999                 }
1000
1001                 if ( $this->mPrinter->getNeedsRawData() ) {
1002                         $this->getResult()->setRawMode();
1003                 }
1004         }
1005
1006         /**
1007          * Execute the actual module, without any error handling
1008          */
1009         protected function executeAction() {
1010                 $params = $this->setupExecuteAction();
1011                 $module = $this->setupModule();
1012                 $this->mModule = $module;
1013
1014                 $this->checkExecutePermissions( $module );
1015
1016                 if ( !$this->checkMaxLag( $module, $params ) ) {
1017                         return;
1018                 }
1019
1020                 if ( !$this->mInternalMode ) {
1021                         $this->setupExternalResponse( $module, $params );
1022                 }
1023
1024                 $this->checkAsserts( $params );
1025
1026                 // Execute
1027                 $module->profileIn();
1028                 $module->execute();
1029                 Hooks::run( 'APIAfterExecute', array( &$module ) );
1030                 $module->profileOut();
1031
1032                 $this->reportUnusedParams();
1033
1034                 if ( !$this->mInternalMode ) {
1035                         //append Debug information
1036                         MWDebug::appendDebugInfoToApiResult( $this->getContext(), $this->getResult() );
1037
1038                         // Print result data
1039                         $this->printResult( false );
1040                 }
1041         }
1042
1043         /**
1044          * Log the preceding request
1045          * @param int $time Time in seconds
1046          */
1047         protected function logRequest( $time ) {
1048                 $request = $this->getRequest();
1049                 $milliseconds = $time === null ? '?' : round( $time * 1000 );
1050                 $s = 'API' .
1051                         ' ' . $request->getMethod() .
1052                         ' ' . wfUrlencode( str_replace( ' ', '_', $this->getUser()->getName() ) ) .
1053                         ' ' . $request->getIP() .
1054                         ' T=' . $milliseconds . 'ms';
1055                 foreach ( $this->getParamsUsed() as $name ) {
1056                         $value = $request->getVal( $name );
1057                         if ( $value === null ) {
1058                                 continue;
1059                         }
1060                         $s .= ' ' . $name . '=';
1061                         if ( strlen( $value ) > 256 ) {
1062                                 $encValue = $this->encodeRequestLogValue( substr( $value, 0, 256 ) );
1063                                 $s .= $encValue . '[...]';
1064                         } else {
1065                                 $s .= $this->encodeRequestLogValue( $value );
1066                         }
1067                 }
1068                 $s .= "\n";
1069                 wfDebugLog( 'api', $s, 'private' );
1070         }
1071
1072         /**
1073          * Encode a value in a format suitable for a space-separated log line.
1074          * @param string $s
1075          * @return string
1076          */
1077         protected function encodeRequestLogValue( $s ) {
1078                 static $table;
1079                 if ( !$table ) {
1080                         $chars = ';@$!*(),/:';
1081                         $numChars = strlen( $chars );
1082                         for ( $i = 0; $i < $numChars; $i++ ) {
1083                                 $table[rawurlencode( $chars[$i] )] = $chars[$i];
1084                         }
1085                 }
1086
1087                 return strtr( rawurlencode( $s ), $table );
1088         }
1089
1090         /**
1091          * Get the request parameters used in the course of the preceding execute() request
1092          * @return array
1093          */
1094         protected function getParamsUsed() {
1095                 return array_keys( $this->mParamsUsed );
1096         }
1097
1098         /**
1099          * Get a request value, and register the fact that it was used, for logging.
1100          * @param string $name
1101          * @param mixed $default
1102          * @return mixed
1103          */
1104         public function getVal( $name, $default = null ) {
1105                 $this->mParamsUsed[$name] = true;
1106
1107                 $ret = $this->getRequest()->getVal( $name );
1108                 if ( $ret === null ) {
1109                         if ( $this->getRequest()->getArray( $name ) !== null ) {
1110                                 // See bug 10262 for why we don't just join( '|', ... ) the
1111                                 // array.
1112                                 $this->setWarning(
1113                                         "Parameter '$name' uses unsupported PHP array syntax"
1114                                 );
1115                         }
1116                         $ret = $default;
1117                 }
1118                 return $ret;
1119         }
1120
1121         /**
1122          * Get a boolean request value, and register the fact that the parameter
1123          * was used, for logging.
1124          * @param string $name
1125          * @return bool
1126          */
1127         public function getCheck( $name ) {
1128                 return $this->getVal( $name, null ) !== null;
1129         }
1130
1131         /**
1132          * Get a request upload, and register the fact that it was used, for logging.
1133          *
1134          * @since 1.21
1135          * @param string $name Parameter name
1136          * @return WebRequestUpload
1137          */
1138         public function getUpload( $name ) {
1139                 $this->mParamsUsed[$name] = true;
1140
1141                 return $this->getRequest()->getUpload( $name );
1142         }
1143
1144         /**
1145          * Report unused parameters, so the client gets a hint in case it gave us parameters we don't know,
1146          * for example in case of spelling mistakes or a missing 'g' prefix for generators.
1147          */
1148         protected function reportUnusedParams() {
1149                 $paramsUsed = $this->getParamsUsed();
1150                 $allParams = $this->getRequest()->getValueNames();
1151
1152                 if ( !$this->mInternalMode ) {
1153                         // Printer has not yet executed; don't warn that its parameters are unused
1154                         $printerParams = array_map(
1155                                 array( $this->mPrinter, 'encodeParamName' ),
1156                                 array_keys( $this->mPrinter->getFinalParams() ?: array() )
1157                         );
1158                         $unusedParams = array_diff( $allParams, $paramsUsed, $printerParams );
1159                 } else {
1160                         $unusedParams = array_diff( $allParams, $paramsUsed );
1161                 }
1162
1163                 if ( count( $unusedParams ) ) {
1164                         $s = count( $unusedParams ) > 1 ? 's' : '';
1165                         $this->setWarning( "Unrecognized parameter$s: '" . implode( $unusedParams, "', '" ) . "'" );
1166                 }
1167         }
1168
1169         /**
1170          * Print results using the current printer
1171          *
1172          * @param bool $isError
1173          */
1174         protected function printResult( $isError ) {
1175                 if ( $this->getConfig()->get( 'DebugAPI' ) !== false ) {
1176                         $this->setWarning( 'SECURITY WARNING: $wgDebugAPI is enabled' );
1177                 }
1178
1179                 $this->getResult()->cleanUpUTF8();
1180                 $printer = $this->mPrinter;
1181                 $printer->profileIn();
1182
1183                 $printer->initPrinter( false );
1184
1185                 $printer->execute();
1186                 $printer->closePrinter();
1187                 $printer->profileOut();
1188         }
1189
1190         /**
1191          * @return bool
1192          */
1193         public function isReadMode() {
1194                 return false;
1195         }
1196
1197         /**
1198          * See ApiBase for description.
1199          *
1200          * @return array
1201          */
1202         public function getAllowedParams() {
1203                 return array(
1204                         'action' => array(
1205                                 ApiBase::PARAM_DFLT => 'help',
1206                                 ApiBase::PARAM_TYPE => 'submodule',
1207                         ),
1208                         'format' => array(
1209                                 ApiBase::PARAM_DFLT => ApiMain::API_DEFAULT_FORMAT,
1210                                 ApiBase::PARAM_TYPE => 'submodule',
1211                         ),
1212                         'maxlag' => array(
1213                                 ApiBase::PARAM_TYPE => 'integer'
1214                         ),
1215                         'smaxage' => array(
1216                                 ApiBase::PARAM_TYPE => 'integer',
1217                                 ApiBase::PARAM_DFLT => 0
1218                         ),
1219                         'maxage' => array(
1220                                 ApiBase::PARAM_TYPE => 'integer',
1221                                 ApiBase::PARAM_DFLT => 0
1222                         ),
1223                         'assert' => array(
1224                                 ApiBase::PARAM_TYPE => array( 'user', 'bot' )
1225                         ),
1226                         'requestid' => null,
1227                         'servedby' => false,
1228                         'curtimestamp' => false,
1229                         'origin' => null,
1230                         'uselang' => array(
1231                                 ApiBase::PARAM_DFLT => 'user',
1232                         ),
1233                 );
1234         }
1235
1236         /** @see ApiBase::getExamplesMessages() */
1237         protected function getExamplesMessages() {
1238                 return array(
1239                         'action=help'
1240                                 => 'apihelp-help-example-main',
1241                         'action=help&recursivesubmodules=1'
1242                                 => 'apihelp-help-example-recursive',
1243                 );
1244         }
1245
1246         public function modifyHelp( array &$help, array $options ) {
1247                 // Wish PHP had an "array_insert_before". Instead, we have to manually
1248                 // reindex the array to get 'permissions' in the right place.
1249                 $oldHelp = $help;
1250                 $help = array();
1251                 foreach ( $oldHelp as $k => $v ) {
1252                         if ( $k === 'submodules' ) {
1253                                 $help['permissions'] = '';
1254                         }
1255                         $help[$k] = $v;
1256                 }
1257                 $help['credits'] = '';
1258
1259                 // Fill 'permissions'
1260                 $help['permissions'] .= Html::openElement( 'div',
1261                         array( 'class' => 'apihelp-block apihelp-permissions' ) );
1262                 $m = $this->msg( 'api-help-permissions' );
1263                 if ( !$m->isDisabled() ) {
1264                         $help['permissions'] .= Html::rawElement( 'div', array( 'class' => 'apihelp-block-head' ),
1265                                 $m->numParams( count( self::$mRights ) )->parse()
1266                         );
1267                 }
1268                 $help['permissions'] .= Html::openElement( 'dl' );
1269                 foreach ( self::$mRights as $right => $rightMsg ) {
1270                         $help['permissions'] .= Html::element( 'dt', null, $right );
1271
1272                         $rightMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )->parse();
1273                         $help['permissions'] .= Html::rawElement( 'dd', null, $rightMsg );
1274
1275                         $groups = array_map( function ( $group ) {
1276                                 return $group == '*' ? 'all' : $group;
1277                         }, User::getGroupsWithPermission( $right ) );
1278
1279                         $help['permissions'] .= Html::rawElement( 'dd', null,
1280                                 $this->msg( 'api-help-permissions-granted-to' )
1281                                         ->numParams( count( $groups ) )
1282                                         ->params( $this->getLanguage()->commaList( $groups ) )
1283                                         ->parse()
1284                         );
1285                 }
1286                 $help['permissions'] .= Html::closeElement( 'dl' );
1287                 $help['permissions'] .= Html::closeElement( 'div' );
1288
1289                 // Fill 'credits', if applicable
1290                 if ( empty( $options['nolead'] ) ) {
1291                         $help['credits'] .= Html::element( 'h' . min( 6, $options['headerlevel'] + 1 ),
1292                                 array( 'id' => '+credits', 'class' => 'apihelp-header' ),
1293                                 $this->msg( 'api-credits-header' )->parse()
1294                         );
1295                         $help['credits'] .= $this->msg( 'api-credits' )->useDatabase( false )->parseAsBlock();
1296                 }
1297         }
1298
1299         private $mCanApiHighLimits = null;
1300
1301         /**
1302          * Check whether the current user is allowed to use high limits
1303          * @return bool
1304          */
1305         public function canApiHighLimits() {
1306                 if ( !isset( $this->mCanApiHighLimits ) ) {
1307                         $this->mCanApiHighLimits = $this->getUser()->isAllowed( 'apihighlimits' );
1308                 }
1309
1310                 return $this->mCanApiHighLimits;
1311         }
1312
1313         /**
1314          * Overrides to return this instance's module manager.
1315          * @return ApiModuleManager
1316          */
1317         public function getModuleManager() {
1318                 return $this->mModuleMgr;
1319         }
1320
1321         /**
1322          * Fetches the user agent used for this request
1323          *
1324          * The value will be the combination of the 'Api-User-Agent' header (if
1325          * any) and the standard User-Agent header (if any).
1326          *
1327          * @return string
1328          */
1329         public function getUserAgent() {
1330                 return trim(
1331                         $this->getRequest()->getHeader( 'Api-user-agent' ) . ' ' .
1332                         $this->getRequest()->getHeader( 'User-agent' )
1333                 );
1334         }
1335
1336         /************************************************************************//**
1337          * @name   Deprecated
1338          * @{
1339          */
1340
1341         /**
1342          * Sets whether the pretty-printer should format *bold* and $italics$
1343          *
1344          * @deprecated since 1.25
1345          * @param bool $help
1346          */
1347         public function setHelp( $help = true ) {
1348                 wfDeprecated( __METHOD__, '1.25' );
1349                 $this->mPrinter->setHelp( $help );
1350         }
1351
1352         /**
1353          * Override the parent to generate help messages for all available modules.
1354          *
1355          * @deprecated since 1.25
1356          * @return string
1357          */
1358         public function makeHelpMsg() {
1359                 wfDeprecated( __METHOD__, '1.25' );
1360                 global $wgMemc;
1361                 $this->setHelp();
1362                 // Get help text from cache if present
1363                 $key = wfMemcKey( 'apihelp', $this->getModuleName(),
1364                         str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
1365
1366                 $cacheHelpTimeout = $this->getConfig()->get( 'APICacheHelpTimeout' );
1367                 if ( $cacheHelpTimeout > 0 ) {
1368                         $cached = $wgMemc->get( $key );
1369                         if ( $cached ) {
1370                                 return $cached;
1371                         }
1372                 }
1373                 $retval = $this->reallyMakeHelpMsg();
1374                 if ( $cacheHelpTimeout > 0 ) {
1375                         $wgMemc->set( $key, $retval, $cacheHelpTimeout );
1376                 }
1377
1378                 return $retval;
1379         }
1380
1381         /**
1382          * @deprecated since 1.25
1383          * @return mixed|string
1384          */
1385         public function reallyMakeHelpMsg() {
1386                 wfDeprecated( __METHOD__, '1.25' );
1387                 $this->setHelp();
1388
1389                 // Use parent to make default message for the main module
1390                 $msg = parent::makeHelpMsg();
1391
1392                 $astriks = str_repeat( '*** ', 14 );
1393                 $msg .= "\n\n$astriks Modules  $astriks\n\n";
1394
1395                 foreach ( $this->mModuleMgr->getNames( 'action' ) as $name ) {
1396                         $module = $this->mModuleMgr->getModule( $name );
1397                         $msg .= self::makeHelpMsgHeader( $module, 'action' );
1398
1399                         $msg2 = $module->makeHelpMsg();
1400                         if ( $msg2 !== false ) {
1401                                 $msg .= $msg2;
1402                         }
1403                         $msg .= "\n";
1404                 }
1405
1406                 $msg .= "\n$astriks Permissions $astriks\n\n";
1407                 foreach ( self::$mRights as $right => $rightMsg ) {
1408                         $rightsMsg = $this->msg( $rightMsg['msg'], $rightMsg['params'] )
1409                                 ->useDatabase( false )
1410                                 ->inLanguage( 'en' )
1411                                 ->text();
1412                         $groups = User::getGroupsWithPermission( $right );
1413                         $msg .= "* " . $right . " *\n  $rightsMsg" .
1414                                 "\nGranted to:\n  " . str_replace( '*', 'all', implode( ', ', $groups ) ) . "\n\n";
1415                 }
1416
1417                 $msg .= "\n$astriks Formats  $astriks\n\n";
1418                 foreach ( $this->mModuleMgr->getNames( 'format' ) as $name ) {
1419                         $module = $this->mModuleMgr->getModule( $name );
1420                         $msg .= self::makeHelpMsgHeader( $module, 'format' );
1421                         $msg2 = $module->makeHelpMsg();
1422                         if ( $msg2 !== false ) {
1423                                 $msg .= $msg2;
1424                         }
1425                         $msg .= "\n";
1426                 }
1427
1428                 $credits = $this->msg( 'api-credits' )->useDatabase( 'false' )->inLanguage( 'en' )->text();
1429                 $credits = str_replace( "\n", "\n   ", $credits );
1430                 $msg .= "\n*** Credits: ***\n   $credits\n";
1431
1432                 return $msg;
1433         }
1434
1435         /**
1436          * @deprecated since 1.25
1437          * @param ApiBase $module
1438          * @param string $paramName What type of request is this? e.g. action,
1439          *    query, list, prop, meta, format
1440          * @return string
1441          */
1442         public static function makeHelpMsgHeader( $module, $paramName ) {
1443                 wfDeprecated( __METHOD__, '1.25' );
1444                 $modulePrefix = $module->getModulePrefix();
1445                 if ( strval( $modulePrefix ) !== '' ) {
1446                         $modulePrefix = "($modulePrefix) ";
1447                 }
1448
1449                 return "* $paramName={$module->getModuleName()} $modulePrefix*";
1450         }
1451
1452         /**
1453          * Check whether the user wants us to show version information in the API help
1454          * @return bool
1455          * @deprecated since 1.21, always returns false
1456          */
1457         public function getShowVersions() {
1458                 wfDeprecated( __METHOD__, '1.21' );
1459
1460                 return false;
1461         }
1462
1463         /**
1464          * Add or overwrite a module in this ApiMain instance. Intended for use by extending
1465          * classes who wish to add their own modules to their lexicon or override the
1466          * behavior of inherent ones.
1467          *
1468          * @deprecated since 1.21, Use getModuleManager()->addModule() instead.
1469          * @param string $name The identifier for this module.
1470          * @param ApiBase $class The class where this module is implemented.
1471          */
1472         protected function addModule( $name, $class ) {
1473                 $this->getModuleManager()->addModule( $name, 'action', $class );
1474         }
1475
1476         /**
1477          * Add or overwrite an output format for this ApiMain. Intended for use by extending
1478          * classes who wish to add to or modify current formatters.
1479          *
1480          * @deprecated since 1.21, Use getModuleManager()->addModule() instead.
1481          * @param string $name The identifier for this format.
1482          * @param ApiFormatBase $class The class implementing this format.
1483          */
1484         protected function addFormat( $name, $class ) {
1485                 $this->getModuleManager()->addModule( $name, 'format', $class );
1486         }
1487
1488         /**
1489          * Get the array mapping module names to class names
1490          * @deprecated since 1.21, Use getModuleManager()'s methods instead.
1491          * @return array
1492          */
1493         function getModules() {
1494                 return $this->getModuleManager()->getNamesWithClasses( 'action' );
1495         }
1496
1497         /**
1498          * Returns the list of supported formats in form ( 'format' => 'ClassName' )
1499          *
1500          * @since 1.18
1501          * @deprecated since 1.21, Use getModuleManager()'s methods instead.
1502          * @return array
1503          */
1504         public function getFormats() {
1505                 return $this->getModuleManager()->getNamesWithClasses( 'format' );
1506         }
1507
1508         /**@}*/
1509
1510 }
1511
1512 /**
1513  * This exception will be thrown when dieUsage is called to stop module execution.
1514  *
1515  * @ingroup API
1516  */
1517 class UsageException extends MWException {
1518
1519         private $mCodestr;
1520
1521         /**
1522          * @var null|array
1523          */
1524         private $mExtraData;
1525
1526         /**
1527          * @param string $message
1528          * @param string $codestr
1529          * @param int $code
1530          * @param array|null $extradata
1531          */
1532         public function __construct( $message, $codestr, $code = 0, $extradata = null ) {
1533                 parent::__construct( $message, $code );
1534                 $this->mCodestr = $codestr;
1535                 $this->mExtraData = $extradata;
1536         }
1537
1538         /**
1539          * @return string
1540          */
1541         public function getCodeString() {
1542                 return $this->mCodestr;
1543         }
1544
1545         /**
1546          * @return array
1547          */
1548         public function getMessageArray() {
1549                 $result = array(
1550                         'code' => $this->mCodestr,
1551                         'info' => $this->getMessage()
1552                 );
1553                 if ( is_array( $this->mExtraData ) ) {
1554                         $result = array_merge( $result, $this->mExtraData );
1555                 }
1556
1557                 return $result;
1558         }
1559
1560         /**
1561          * @return string
1562          */
1563         public function __toString() {
1564                 return "{$this->getCodeString()}: {$this->getMessage()}";
1565         }
1566 }
1567
1568 /**
1569  * For really cool vim folding this needs to be at the end:
1570  * vim: foldmarker=@{,@} foldmethod=marker
1571  */