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 if ( !defined( 'MEDIAWIKI' ) ) {
  29         // Eclipse helper - will be ignored in production
  30         require_once( 'ApiBase.php' );
  31 }
  32
  33 /**
  34  * This is the main API class, used for both external and internal processing.
  35  * When executed, it will create the requested formatter object,
  36  * instantiate and execute an object associated with the needed action,
  37  * and use formatter to print results.
  38  * In case of an exception, an error message will be printed using the same formatter.
  39  *
  40  * To use API from another application, run it using FauxRequest object, in which
  41  * case any internal exceptions will not be handled but passed up to the caller.
  42  * After successful execution, use getResult() for the resulting data.
  43  *
  44  * @ingroup API
  45  */
  46 class ApiMain extends ApiBase {
  47
  48         /**
  49          * When no format parameter is given, this format will be used
  50          */
  51         const API_DEFAULT_FORMAT = 'xmlfm';
  52
  53         /**
  54          * List of available modules: action name => module class
  55          */
  56         private static $Modules = array(
  57                 'login' => 'ApiLogin',
  58                 'logout' => 'ApiLogout',
  59                 'query' => 'ApiQuery',
  60                 'expandtemplates' => 'ApiExpandTemplates',
  61                 'parse' => 'ApiParse',
  62                 'opensearch' => 'ApiOpenSearch',
  63                 'feedwatchlist' => 'ApiFeedWatchlist',
  64                 'help' => 'ApiHelp',
  65                 'paraminfo' => 'ApiParamInfo',
  66                 'rsd' => 'ApiRsd',
  67
  68                 // Write modules
  69                 'purge' => 'ApiPurge',
  70                 'rollback' => 'ApiRollback',
  71                 'delete' => 'ApiDelete',
  72                 'undelete' => 'ApiUndelete',
  73                 'protect' => 'ApiProtect',
  74                 'block' => 'ApiBlock',
  75                 'unblock' => 'ApiUnblock',
  76                 'move' => 'ApiMove',
  77                 'edit' => 'ApiEditPage',
  78                 'upload' => 'ApiUpload',
  79                 'emailuser' => 'ApiEmailUser',
  80                 'watch' => 'ApiWatch',
  81                 'patrol' => 'ApiPatrol',
  82                 'import' => 'ApiImport',
  83                 'userrights' => 'ApiUserrights',
  84         );
  85
  86         /**
  87          * List of available formats: format name => format class
  88          */
  89         private static $Formats = array(
  90                 'json' => 'ApiFormatJson',
  91                 'jsonfm' => 'ApiFormatJson',
  92                 'php' => 'ApiFormatPhp',
  93                 'phpfm' => 'ApiFormatPhp',
  94                 'wddx' => 'ApiFormatWddx',
  95                 'wddxfm' => 'ApiFormatWddx',
  96                 'xml' => 'ApiFormatXml',
  97                 'xmlfm' => 'ApiFormatXml',
  98                 'yaml' => 'ApiFormatYaml',
  99                 'yamlfm' => 'ApiFormatYaml',
 100                 'rawfm' => 'ApiFormatJson',
 101                 'txt' => 'ApiFormatTxt',
 102                 'txtfm' => 'ApiFormatTxt',
 103                 'dbg' => 'ApiFormatDbg',
 104                 'dbgfm' => 'ApiFormatDbg',
 105                 'dump' => 'ApiFormatDump',
 106                 'dumpfm' => 'ApiFormatDump',
 107         );
 108
 109         /**
 110          * List of user roles that are specifically relevant to the API.
 111          * array( 'right' => array ( 'msg'    => 'Some message with a $1',
 112          *                           'params' => array ( $someVarToSubst ) ),
 113          *                          );
 114          */
 115         private static $mRights = array(
 116                 'writeapi' => array(
 117                         'msg' => 'Use of the write API',
 118                         'params' => array()
 119                 ),
 120                 'apihighlimits' => array(
 121                         'msg' => 'Use higher limits in API queries (Slow queries: $1 results; Fast queries: $2 results). The limits for slow queries also apply to multivalue parameters.',
 122                         'params' => array( ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 )
 123                 )
 124         );
 125
 126         private $mPrinter, $mModules, $mModuleNames, $mFormats, $mFormatNames;
 127         private $mResult, $mAction, $mShowVersions, $mEnableWrite, $mRequest;
 128         private $mInternalMode, $mSquidMaxage, $mModule;
 129
 130         private $mCacheMode = 'private';
 131         private $mCacheControl = array();
 132
 133         /**
 134          * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
 135          *
 136          * @param $request WebRequest - if this is an instance of FauxRequest, errors are thrown and no printing occurs
 137          * @param $enableWrite bool should be set to true if the api may modify data
 138          */
 139         public function __construct( $request, $enableWrite = false ) {
 140                 $this->mInternalMode = ( $request instanceof FauxRequest );
 141
 142                 // Special handling for the main module: $parent === $this
 143                 parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
 144
 145                 if ( !$this->mInternalMode ) {
 146                         // Impose module restrictions.
 147                         // If the current user cannot read,
 148                         // Remove all modules other than login
 149                         global $wgUser;
 150
 151                         if ( $request->getVal( 'callback' ) !== null ) {
 152                                 // JSON callback allows cross-site reads.
 153                                 // For safety, strip user credentials.
 154                                 wfDebug( "API: stripping user credentials for JSON callback\n" );
 155                                 $wgUser = new User();
 156                         }
 157                 }
 158
 159                 global $wgAPIModules; // extension modules
 160                 $this->mModules = $wgAPIModules + self::$Modules;
 161
 162                 $this->mModuleNames = array_keys( $this->mModules );
 163                 $this->mFormats = self::$Formats;
 164                 $this->mFormatNames = array_keys( $this->mFormats );
 165
 166                 $this->mResult = new ApiResult( $this );
 167                 $this->mShowVersions = false;
 168                 $this->mEnableWrite = $enableWrite;
 169
 170                 $this->mRequest = &$request;
 171
 172                 $this->mSquidMaxage = - 1; // flag for executeActionWithErrorHandling()
 173                 $this->mCommit = false;
 174         }
 175
 176         /**
 177          * Return true if the API was started by other PHP code using FauxRequest
 178          */
 179         public function isInternalMode() {
 180                 return $this->mInternalMode;
 181         }
 182
 183         /**
 184          * Return the request object that contains client's request
 185          * @return WebRequest
 186          */
 187         public function getRequest() {
 188                 return $this->mRequest;
 189         }
 190
 191         /**
 192          * Get the ApiResult object associated with current request
 193          *
 194          * @return ApiResult
 195          */
 196         public function getResult() {
 197                 return $this->mResult;
 198         }
 199
 200         /**
 201          * Get the API module object. Only works after executeAction()
 202          */
 203         public function getModule() {
 204                 return $this->mModule;
 205         }
 206
 207         /**
 208          * Get the result formatter object. Only works after setupExecuteAction()
 209          *
 210          * @return ApiFormatBase
 211          */
 212         public function getPrinter() {
 213                 return $this->mPrinter;
 214         }
 215
 216         /**
 217          * Set how long the response should be cached.
 218          */
 219         public function setCacheMaxAge( $maxage ) {
 220                 $this->setCacheControl( array(
 221                         'max-age' => $maxage,
 222                         's-maxage' => $maxage
 223                 ) );
 224         }
 225
 226         /**
 227          * Set the type of caching headers which will be sent.
 228          *
 229          * @param $mode String One of:
 230          *    - 'public':     Cache this object in public caches, if the maxage or smaxage
 231          *         parameter is set, or if setCacheMaxAge() was called. If a maximum age is
 232          *         not provided by any of these means, the object will be private.
 233          *    - 'private':    Cache this object only in private client-side caches.
 234          *    - 'anon-public-user-private': Make this object cacheable for logged-out
 235          *         users, but private for logged-in users. IMPORTANT: If this is set, it must be
 236          *         set consistently for a given URL, it cannot be set differently depending on
 237          *         things like the contents of the database, or whether the user is logged in.
 238          *
 239          *  If the wiki does not allow anonymous users to read it, the mode set here
 240          *  will be ignored, and private caching headers will always be sent. In other words,
 241          *  the "public" mode is equivalent to saying that the data sent is as public as a page
 242          *  view.
 243          *
 244          *  For user-dependent data, the private mode should generally be used. The
 245          *  anon-public-user-private mode should only be used where there is a particularly
 246          *  good performance reason for caching the anonymous response, but where the
 247          *  response to logged-in users may differ, or may contain private data.
 248          *
 249          *  If this function is never called, then the default will be the private mode.
 250          */
 251         public function setCacheMode( $mode ) {
 252                 if ( !in_array( $mode, array( 'private', 'public', 'anon-public-user-private' ) ) ) {
 253                         wfDebug( __METHOD__ . ": unrecognised cache mode \"$mode\"\n" );
 254                         // Ignore for forwards-compatibility
 255                         return;
 256                 }
 257
 258                 if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
 259                         // Private wiki, only private headers
 260                         if ( $mode !== 'private' ) {
 261                                 wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki\n" );
 262                                 return;
 263                         }
 264                 }
 265
 266                 wfDebug( __METHOD__ . ": setting cache mode $mode\n" );
 267                 $this->mCacheMode = $mode;
 268         }
 269
 270         /**
 271          * @deprecated Private caching is now the default, so there is usually no
 272          * need to call this function. If there is a need, you can use
 273          * $this->setCacheMode('private')
 274          */
 275         public function setCachePrivate() {
 276                 $this->setCacheMode( 'private' );
 277         }
 278
 279         /**
 280          * Set directives (key/value pairs) for the Cache-Control header.
 281          * Boolean values will be formatted as such, by including or omitting
 282          * without an equals sign.
 283          *
 284          * Cache control values set here will only be used if the cache mode is not
 285          * private, see setCacheMode().
 286          */
 287         public function setCacheControl( $directives ) {
 288                 $this->mCacheControl = $directives + $this->mCacheControl;
 289         }
 290
 291         /**
 292          * Make sure Vary: Cookie and friends are set. Use this when the output of a request
 293          * may be cached for anons but may not be cached for logged-in users.
 294          *
 295          * WARNING: This function must be called CONSISTENTLY for a given URL. This means that a
 296          * given URL must either always or never call this function; if it sometimes does and
 297          * sometimes doesn't, stuff will break.
 298          *
 299          * @deprecated Use setCacheMode( 'anon-public-user-private' )
 300          */
 301         public function setVaryCookie() {
 302                 $this->setCacheMode( 'anon-public-user-private' );
 303         }
 304
 305         /**
 306          * Create an instance of an output formatter by its name
 307          */
 308         public function createPrinterByName( $format ) {
 309                 if ( !isset( $this->mFormats[$format] ) ) {
 310                         $this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
 311                 }
 312                 return new $this->mFormats[$format] ( $this, $format );
 313         }
 314
 315         /**
 316          * Execute api request. Any errors will be handled if the API was called by the remote client.
 317          */
 318         public function execute() {
 319                 $this->profileIn();
 320                 if ( $this->mInternalMode ) {
 321                         $this->executeAction();
 322                 } else {
 323                         $this->executeActionWithErrorHandling();
 324                 }
 325
 326                 $this->profileOut();
 327         }
 328
 329         /**
 330          * Execute an action, and in case of an error, erase whatever partial results
 331          * have been accumulated, and replace it with an error message and a help screen.
 332          */
 333         protected function executeActionWithErrorHandling() {
 334                 // In case an error occurs during data output,
 335                 // clear the output buffer and print just the error information
 336                 ob_start();
 337
 338                 try {
 339                         $this->executeAction();
 340                 } catch ( Exception $e ) {
 341                         // Log it
 342                         if ( $e instanceof MWException ) {
 343                                 wfDebugLog( 'exception', $e->getLogMessage() );
 344                         }
 345
 346                         //
 347                         // Handle any kind of exception by outputing properly formatted error message.
 348                         // If this fails, an unhandled exception should be thrown so that global error
 349                         // handler will process and log it.
 350                         //
 351
 352                         $errCode = $this->substituteResultWithError( $e );
 353
 354                         // Error results should not be cached
 355                         $this->setCacheMode( 'private' );
 356
 357                         $headerStr = 'MediaWiki-API-Error: ' . $errCode;
 358                         if ( $e->getCode() === 0 ) {
 359                                 header( $headerStr );
 360                         } else {
 361                                 header( $headerStr, true, $e->getCode() );
 362                         }
 363
 364                         // Reset and print just the error message
 365                         ob_clean();
 366
 367                         // If the error occured during printing, do a printer->profileOut()
 368                         $this->mPrinter->safeProfileOut();
 369                         $this->printResult( true );
 370                 }
 371
 372                 // Send cache headers after any code which might generate an error, to
 373                 // avoid sending public cache headers for errors.
 374                 $this->sendCacheHeaders();
 375
 376                 if ( $this->mPrinter->getIsHtml() && !$this->mPrinter->isDisabled() ) {
 377                         echo wfReportTime();
 378                 }
 379
 380                 ob_end_flush();
 381         }
 382
 383         protected function sendCacheHeaders() {
 384                 if ( $this->mCacheMode == 'private' ) {
 385                         header( 'Cache-Control: private' );
 386                         return;
 387                 }
 388
 389                 if ( $this->mCacheMode == 'anon-public-user-private' ) {
 390                         global $wgUseXVO, $wgOut;
 391                         header( 'Vary: Accept-Encoding, Cookie' );
 392                         if ( $wgUseXVO ) {
 393                                 header( $wgOut->getXVO() );
 394                                 if ( $wgOut->haveCacheVaryCookies() ) {
 395                                         // Logged in, mark this request private
 396                                         header( 'Cache-Control: private' );
 397                                         return;
 398                                 }
 399                                 // Logged out, send normal public headers below
 400                         } elseif ( session_id() != '' ) {
 401                                 // Logged in or otherwise has session (e.g. anonymous users who have edited)
 402                                 // Mark request private
 403                                 header( 'Cache-Control: private' );
 404                                 return;
 405                         } // else no XVO and anonymous, send public headers below
 406                 }
 407
 408                 // If nobody called setCacheMaxAge(), use the (s)maxage parameters
 409                 if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
 410                         $this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
 411                 }
 412                 if ( !isset( $this->mCacheControl['max-age'] ) ) {
 413                         $this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
 414                 }
 415
 416                 if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
 417                         // Public cache not requested
 418                         // Sending a Vary header in this case is harmless, and protects us
 419                         // against conditional calls of setCacheMaxAge().
 420                         header( 'Cache-Control: private' );
 421                         return;
 422                 }
 423
 424                 $this->mCacheControl['public'] = true;
 425
 426                 // Send an Expires header
 427                 $maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
 428                 $expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
 429                 header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );
 430
 431                 // Construct the Cache-Control header
 432                 $ccHeader = '';
 433                 $separator = '';
 434                 foreach ( $this->mCacheControl as $name => $value ) {
 435                         if ( is_bool( $value ) ) {
 436                                 if ( $value ) {
 437                                         $ccHeader .= $separator . $name;
 438                                         $separator = ', ';
 439                                 }
 440                         } else {
 441                                 $ccHeader .= $separator . "$name=$value";
 442                                 $separator = ', ';
 443                         }
 444                 }
 445
 446                 header( "Cache-Control: $ccHeader" );
 447         }
 448
 449         /**
 450          * Replace the result data with the information about an exception.
 451          * Returns the error code
 452          * @param $e Exception
 453          */
 454         protected function substituteResultWithError( $e ) {
 455                 // Printer may not be initialized if the extractRequestParams() fails for the main module
 456                 if ( !isset ( $this->mPrinter ) ) {
 457                         // The printer has not been created yet. Try to manually get formatter value.
 458                         $value = $this->getRequest()->getVal( 'format', self::API_DEFAULT_FORMAT );
 459                         if ( !in_array( $value, $this->mFormatNames ) ) {
 460                                 $value = self::API_DEFAULT_FORMAT;
 461                         }
 462
 463                         $this->mPrinter = $this->createPrinterByName( $value );
 464                         if ( $this->mPrinter->getNeedsRawData() ) {
 465                                 $this->getResult()->setRawMode();
 466                         }
 467                 }
 468
 469                 if ( $e instanceof UsageException ) {
 470                         //
 471                         // User entered incorrect parameters - print usage screen
 472                         //
 473                         $errMessage = $e->getMessageArray();
 474
 475                         // Only print the help message when this is for the developer, not runtime
 476                         if ( $this->mPrinter->getWantsHelp() || $this->mAction == 'help' ) {
 477                                 ApiResult::setContent( $errMessage, $this->makeHelpMsg() );
 478                         }
 479
 480                 } else {
 481                         global $wgShowSQLErrors, $wgShowExceptionDetails;
 482                         //
 483                         // Something is seriously wrong
 484                         //
 485                         if ( ( $e instanceof DBQueryError ) && !$wgShowSQLErrors ) {
 486                                 $info = 'Database query error';
 487                         } else {
 488                                 $info = "Exception Caught: {$e->getMessage()}";
 489                         }
 490
 491                         $errMessage = array(
 492                                 'code' => 'internal_api_error_' . get_class( $e ),
 493                                 'info' => $info,
 494                         );
 495                         ApiResult::setContent( $errMessage, $wgShowExceptionDetails ? "\n\n{$e->getTraceAsString()}\n\n" : '' );
 496                 }
 497
 498                 $this->getResult()->reset();
 499                 $this->getResult()->disableSizeCheck();
 500                 // Re-add the id
 501                 $requestid = $this->getParameter( 'requestid' );
 502                 if ( !is_null( $requestid ) ) {
 503                         $this->getResult()->addValue( null, 'requestid', $requestid );
 504                 }
 505                 // servedby is especially useful when debugging errors
 506                 $this->getResult()->addValue( null, 'servedby', wfHostName() );
 507                 $this->getResult()->addValue( null, 'error', $errMessage );
 508
 509                 return $errMessage['code'];
 510         }
 511
 512         /**
 513          * Set up for the execution.
 514          */
 515         protected function setupExecuteAction() {
 516                 // First add the id to the top element
 517                 $requestid = $this->getParameter( 'requestid' );
 518                 if ( !is_null( $requestid ) ) {
 519                         $this->getResult()->addValue( null, 'requestid', $requestid );
 520                 }
 521                 $servedby = $this->getParameter( 'servedby' );
 522                 if ( $servedby ) {
 523                         $this->getResult()->addValue( null, 'servedby', wfHostName() );
 524                 }
 525
 526                 $params = $this->extractRequestParams();
 527
 528                 $this->mShowVersions = $params['version'];
 529                 $this->mAction = $params['action'];
 530
 531                 if ( !is_string( $this->mAction ) ) {
 532                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 533                 }
 534
 535                 return $params;
 536         }
 537
 538         /**
 539          * Set up the module for response
 540          * @return ApiBase The module that will handle this action
 541          */
 542         protected function setupModule() {
 543                 // Instantiate the module requested by the user
 544                 $module = new $this->mModules[$this->mAction] ( $this, $this->mAction );
 545                 $this->mModule = $module;
 546
 547                 $moduleParams = $module->extractRequestParams();
 548
 549                 // Die if token required, but not provided (unless there is a gettoken parameter)
 550                 $salt = $module->getTokenSalt();
 551                 if ( $salt !== false && !isset( $moduleParams['gettoken'] ) ) {
 552                         if ( !isset( $moduleParams['token'] ) ) {
 553                                 $this->dieUsageMsg( array( 'missingparam', 'token' ) );
 554                         } else {
 555                                 global $wgUser;
 556                                 if ( !$wgUser->matchEditToken( $moduleParams['token'], $salt ) ) {
 557                                         $this->dieUsageMsg( array( 'sessionfailure' ) );
 558                                 }
 559                         }
 560                 }
 561                 return $module;
 562         }
 563
 564         /**
 565          * Check the max lag if necessary
 566          * @param $module ApiBase object: Api module being used
 567          * @param $params Array an array containing the request parameters.
 568          * @return boolean True on success, false should exit immediately
 569          */
 570         protected function checkMaxLag( $module, $params ) {
 571                 if ( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
 572                         // Check for maxlag
 573                         global $wgShowHostnames;
 574                         $maxLag = $params['maxlag'];
 575                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 576                         if ( $lag > $maxLag ) {
 577                                 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 578                                 header( 'X-Database-Lag: ' . intval( $lag ) );
 579                                 if ( $wgShowHostnames ) {
 580                                         $this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
 581                                 } else {
 582                                         $this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
 583                                 }
 584                                 return false;
 585                         }
 586                 }
 587                 return true;
 588         }
 589
 590
 591         /**
 592          * Check for sufficient permissions to execute
 593          * @param $module ApiBase An Api module
 594          */
 595         protected function checkExecutePermissions( $module ) {
 596                 global $wgUser;
 597                 if ( $module->isReadMode() && !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) &&
 598                         !$wgUser->isAllowed( 'read' ) )
 599                 {
 600                         $this->dieUsageMsg( array( 'readrequired' ) );
 601                 }
 602                 if ( $module->isWriteMode() ) {
 603                         if ( !$this->mEnableWrite ) {
 604                                 $this->dieUsageMsg( array( 'writedisabled' ) );
 605                         }
 606                         if ( !$wgUser->isAllowed( 'writeapi' ) ) {
 607                                 $this->dieUsageMsg( array( 'writerequired' ) );
 608                         }
 609                         if ( wfReadOnly() ) {
 610                                 $this->dieReadOnly();
 611                         }
 612                 }
 613         }
 614
 615         /**
 616          * Check POST for external response and setup result printer
 617          * @param $module ApiBase An Api module
 618          * @param $params Array an array with the request parameters
 619          */
 620         protected function setupExternalResponse( $module, $params ) {
 621                 // Ignore mustBePosted() for internal calls
 622                 if ( $module->mustBePosted() && !$this->mRequest->wasPosted() ) {
 623                         $this->dieUsageMsg( array( 'mustbeposted', $this->mAction ) );
 624                 }
 625
 626                 // See if custom printer is used
 627                 $this->mPrinter = $module->getCustomPrinter();
 628                 if ( is_null( $this->mPrinter ) ) {
 629                         // Create an appropriate printer
 630                         $this->mPrinter = $this->createPrinterByName( $params['format'] );
 631                 }
 632
 633                 if ( $this->mPrinter->getNeedsRawData() ) {
 634                         $this->getResult()->setRawMode();
 635                 }
 636         }
 637
 638         /**
 639          * Execute the actual module, without any error handling
 640          */
 641         protected function executeAction() {
 642                 $params = $this->setupExecuteAction();
 643                 $module = $this->setupModule();
 644
 645                 $this->checkExecutePermissions( $module );
 646
 647                 if ( !$this->checkMaxLag( $module, $params ) ) {
 648                         return;
 649                 }
 650
 651                 if ( !$this->mInternalMode ) {
 652                         $this->setupExternalResponse( $module, $params );
 653                 }
 654
 655                 // Execute
 656                 $module->profileIn();
 657                 $module->execute();
 658                 wfRunHooks( 'APIAfterExecute', array( &$module ) );
 659                 $module->profileOut();
 660
 661                 if ( !$this->mInternalMode ) {
 662                         // Print result data
 663                         $this->printResult( false );
 664                 }
 665         }
 666
 667         /**
 668          * Print results using the current printer
 669          */
 670         protected function printResult( $isError ) {
 671                 $this->getResult()->cleanUpUTF8();
 672                 $printer = $this->mPrinter;
 673                 $printer->profileIn();
 674
 675                 /**
 676                  * If the help message is requested in the default (xmlfm) format,
 677                  * tell the printer not to escape ampersands so that our links do
 678                  * not break.
 679                  */
 680                 $printer->setUnescapeAmps( ( $this->mAction == 'help' || $isError )
 681                                 && $printer->getFormat() == 'XML' && $printer->getIsHtml() );
 682
 683                 $printer->initPrinter( $isError );
 684
 685                 $printer->execute();
 686                 $printer->closePrinter();
 687                 $printer->profileOut();
 688         }
 689
 690         public function isReadMode() {
 691                 return false;
 692         }
 693
 694         /**
 695          * See ApiBase for description.
 696          */
 697         public function getAllowedParams() {
 698                 return array(
 699                         'format' => array(
 700                                 ApiBase::PARAM_DFLT => ApiMain::API_DEFAULT_FORMAT,
 701                                 ApiBase::PARAM_TYPE => $this->mFormatNames
 702                         ),
 703                         'action' => array(
 704                                 ApiBase::PARAM_DFLT => 'help',
 705                                 ApiBase::PARAM_TYPE => $this->mModuleNames
 706                         ),
 707                         'version' => false,
 708                         'maxlag'  => array(
 709                                 ApiBase::PARAM_TYPE => 'integer'
 710                         ),
 711                         'smaxage' => array(
 712                                 ApiBase::PARAM_TYPE => 'integer',
 713                                 ApiBase::PARAM_DFLT => 0
 714                         ),
 715                         'maxage' => array(
 716                                 ApiBase::PARAM_TYPE => 'integer',
 717                                 ApiBase::PARAM_DFLT => 0
 718                         ),
 719                         'requestid' => null,
 720                         'servedby'  => false,
 721                 );
 722         }
 723
 724         /**
 725          * See ApiBase for description.
 726          */
 727         public function getParamDescription() {
 728                 return array(
 729                         'format' => 'The format of the output',
 730                         'action' => 'What action you would like to perform. See below for module help',
 731                         'version' => 'When showing help, include version for each module',
 732                         'maxlag' => 'Maximum lag',
 733                         'smaxage' => 'Set the s-maxage header to this many seconds. Errors are never cached',
 734                         'maxage' => 'Set the max-age header to this many seconds. Errors are never cached',
 735                         'requestid' => 'Request ID to distinguish requests. This will just be output back to you',
 736                         'servedby' => 'Include the hostname that served the request in the results. Unconditionally shown on error',
 737                 );
 738         }
 739
 740         /**
 741          * See ApiBase for description.
 742          */
 743         public function getDescription() {
 744                 return array(
 745                         '',
 746                         '',
 747                         '******************************************************************************************',
 748                         '**                                                                                      **',
 749                         '**              This is an auto-generated MediaWiki API documentation page              **',
 750                         '**                                                                                      **',
 751                         '**                            Documentation and Examples:                               **',
 752                         '**                         http://www.mediawiki.org/wiki/API                            **',
 753                         '**                                                                                      **',
 754                         '******************************************************************************************',
 755                         '',
 756                         'Status:                All features shown on this page should be working, but the API',
 757                         '                       is still in active development, and  may change at any time.',
 758                         '                       Make sure to monitor our mailing list for any updates',
 759                         '',
 760                         'Documentation:         http://www.mediawiki.org/wiki/API',
 761                         'Mailing list:          http://lists.wikimedia.org/mailman/listinfo/mediawiki-api',
 762                         'Api Announcements:     http://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce',
 763                         'Bugs & Requests:       http://bugzilla.wikimedia.org/buglist.cgi?component=API&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&order=bugs.delta_ts',
 764                         '',
 765                         '',
 766                         '',
 767                         '',
 768                         '',
 769                 );
 770         }
 771
 772         public function getPossibleErrors() {
 773                 return array_merge( parent::getPossibleErrors(), array(
 774                         array( 'readonlytext' ),
 775                         array( 'code' => 'unknown_format', 'info' => 'Unrecognized format: format' ),
 776                         array( 'code' => 'unknown_action', 'info' => 'The API requires a valid action parameter' ),
 777                         array( 'code' => 'maxlag', 'info' => 'Waiting for host: x seconds lagged' ),
 778                         array( 'code' => 'maxlag', 'info' => 'Waiting for a database server: x seconds lagged' ),
 779                 ) );
 780         }
 781
 782         /**
 783          * Returns an array of strings with credits for the API
 784          */
 785         protected function getCredits() {
 786                 return array(
 787                         'API developers:',
 788                         '    Roan Kattouw <Firstname>.<Lastname>@gmail.com (lead developer Sep 2007-present)',
 789                         '    Victor Vasiliev - vasilvv at gee mail dot com',
 790                         '    Bryan Tong Minh - bryan . tongminh @ gmail . com',
 791                         '    Sam Reed - sam @ reedyboy . net',
 792                         '    Yuri Astrakhan <Firstname><Lastname>@gmail.com (creator, lead developer Sep 2006-Sep 2007)',
 793                         '',
 794                         'Please send your comments, suggestions and questions to mediawiki-api@lists.wikimedia.org',
 795                         'or file a bug report at http://bugzilla.wikimedia.org/'
 796                 );
 797         }
 798         /**
 799          * Sets whether the pretty-printer should format *bold* and $italics$
 800          */
 801         public function setHelp( $help = true ) {
 802                 $this->mPrinter->setHelp( $help );
 803         }
 804
 805         /**
 806          * Override the parent to generate help messages for all available modules.
 807          */
 808         public function makeHelpMsg() {
 809                 global $wgMemc, $wgAPICacheHelp, $wgAPICacheHelpTimeout;
 810                 $this->setHelp();
 811                 // Get help text from cache if present
 812                 $key = wfMemcKey( 'apihelp', $this->getModuleName(),
 813                         SpecialVersion::getVersion( 'nodb' ) .
 814                         $this->getMain()->getShowVersions() );
 815                 if ( $wgAPICacheHelp ) {
 816                         $cached = $wgMemc->get( $key );
 817                         if ( $cached ) {
 818                                 return $cached;
 819                         }
 820                 }
 821                 $retval = $this->reallyMakeHelpMsg();
 822                 if ( $wgAPICacheHelp ) {
 823                         $wgMemc->set( $key, $retval, $wgAPICacheHelpTimeout );
 824                 }
 825                 return $retval;
 826         }
 827
 828         public function reallyMakeHelpMsg() {
 829                 $this->setHelp();
 830
 831                 // Use parent to make default message for the main module
 832                 $msg = parent::makeHelpMsg();
 833
 834                 $astriks = str_repeat( '*** ', 10 );
 835                 $msg .= "\n\n$astriks Modules  $astriks\n\n";
 836                 foreach ( array_keys( $this->mModules ) as $moduleName ) {
 837                         $module = new $this->mModules[$moduleName] ( $this, $moduleName );
 838                         $msg .= self::makeHelpMsgHeader( $module, 'action' );
 839                         $msg2 = $module->makeHelpMsg();
 840                         if ( $msg2 !== false ) {
 841                                 $msg .= $msg2;
 842                         }
 843                         $msg .= "\n";
 844                 }
 845
 846                 $msg .= "\n$astriks Permissions $astriks\n\n";
 847                 foreach ( self::$mRights as $right => $rightMsg ) {
 848                         $groups = User::getGroupsWithPermission( $right );
 849                         $msg .= "* " . $right . " *\n  " . wfMsgReplaceArgs( $rightMsg[ 'msg' ], $rightMsg[ 'params' ] ) .
 850                                                 "\nGranted to:\n  " . str_replace( '*', 'all', implode( ', ', $groups ) ) . "\n\n";
 851
 852                 }
 853
 854                 $msg .= "\n$astriks Formats  $astriks\n\n";
 855                 foreach ( array_keys( $this->mFormats ) as $formatName ) {
 856                         $module = $this->createPrinterByName( $formatName );
 857                         $msg .= self::makeHelpMsgHeader( $module, 'format' );
 858                         $msg2 = $module->makeHelpMsg();
 859                         if ( $msg2 !== false ) {
 860                                 $msg .= $msg2;
 861                         }
 862                         $msg .= "\n";
 863                 }
 864
 865                 $msg .= "\n*** Credits: ***\n   " . implode( "\n   ", $this->getCredits() ) . "\n";
 866
 867                 return $msg;
 868         }
 869
 870         public static function makeHelpMsgHeader( $module, $paramName ) {
 871                 $modulePrefix = $module->getModulePrefix();
 872                 if ( strval( $modulePrefix ) !== '' ) {
 873                         $modulePrefix = "($modulePrefix) ";
 874                 }
 875
 876                 return "* $paramName={$module->getModuleName()} $modulePrefix*";
 877         }
 878
 879         private $mIsBot = null;
 880         private $mIsSysop = null;
 881         private $mCanApiHighLimits = null;
 882
 883         /**
 884          * Returns true if the currently logged in user is a bot, false otherwise
 885          * OBSOLETE, use canApiHighLimits() instead
 886          */
 887         public function isBot() {
 888                 if ( !isset( $this->mIsBot ) ) {
 889                         global $wgUser;
 890                         $this->mIsBot = $wgUser->isAllowed( 'bot' );
 891                 }
 892                 return $this->mIsBot;
 893         }
 894
 895         /**
 896          * Similar to isBot(), this method returns true if the logged in user is
 897          * a sysop, and false if not.
 898          * OBSOLETE, use canApiHighLimits() instead
 899          */
 900         public function isSysop() {
 901                 if ( !isset( $this->mIsSysop ) ) {
 902                         global $wgUser;
 903                         $this->mIsSysop = in_array( 'sysop', $wgUser->getGroups() );
 904                 }
 905
 906                 return $this->mIsSysop;
 907         }
 908
 909         /**
 910          * Check whether the current user is allowed to use high limits
 911          * @return bool
 912          */
 913         public function canApiHighLimits() {
 914                 if ( !isset( $this->mCanApiHighLimits ) ) {
 915                         global $wgUser;
 916                         $this->mCanApiHighLimits = $wgUser->isAllowed( 'apihighlimits' );
 917                 }
 918
 919                 return $this->mCanApiHighLimits;
 920         }
 921
 922         /**
 923          * Check whether the user wants us to show version information in the API help
 924          * @return bool
 925          */
 926         public function getShowVersions() {
 927                 return $this->mShowVersions;
 928         }
 929
 930         /**
 931          * Returns the version information of this file, plus it includes
 932          * the versions for all files that are not callable proper API modules
 933          */
 934         public function getVersion() {
 935                 $vers = array ();
 936                 $vers[] = 'MediaWiki: ' . SpecialVersion::getVersion() . "\n    http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/";
 937                 $vers[] = __CLASS__ . ': $Id$';
 938                 $vers[] = ApiBase::getBaseVersion();
 939                 $vers[] = ApiFormatBase::getBaseVersion();
 940                 $vers[] = ApiQueryBase::getBaseVersion();
 941                 return $vers;
 942         }
 943
 944         /**
 945          * Add or overwrite a module in this ApiMain instance. Intended for use by extending
 946          * classes who wish to add their own modules to their lexicon or override the
 947          * behavior of inherent ones.
 948          *
 949          * @param $mdlName String The identifier for this module.
 950          * @param $mdlClass String The class where this module is implemented.
 951          */
 952         protected function addModule( $mdlName, $mdlClass ) {
 953                 $this->mModules[$mdlName] = $mdlClass;
 954         }
 955
 956         /**
 957          * Add or overwrite an output format for this ApiMain. Intended for use by extending
 958          * classes who wish to add to or modify current formatters.
 959          *
 960          * @param $fmtName The identifier for this format.
 961          * @param $fmtClass The class implementing this format.
 962          */
 963         protected function addFormat( $fmtName, $fmtClass ) {
 964                 $this->mFormats[$fmtName] = $fmtClass;
 965         }
 966
 967         /**
 968          * Get the array mapping module names to class names
 969          */
 970         function getModules() {
 971                 return $this->mModules;
 972         }
 973 }
 974
 975 /**
 976  * This exception will be thrown when dieUsage is called to stop module execution.
 977  * The exception handling code will print a help screen explaining how this API may be used.
 978  *
 979  * @ingroup API
 980  */
 981 class UsageException extends Exception {
 982
 983         private $mCodestr;
 984         private $mExtraData;
 985
 986         public function __construct( $message, $codestr, $code = 0, $extradata = null ) {
 987                 parent::__construct( $message, $code );
 988                 $this->mCodestr = $codestr;
 989                 $this->mExtraData = $extradata;
 990         }
 991
 992         public function getCodeString() {
 993                 return $this->mCodestr;
 994         }
 995
 996         public function getMessageArray() {
 997                 $result = array(
 998                         'code' => $this->mCodestr,
 999                         'info' => $this->getMessage()
1000                 );
1001                 if ( is_array( $this->mExtraData ) ) {
1002                         $result = array_merge( $result, $this->mExtraData );
1003                 }
1004                 return $result;
1005         }
1006
1007         public function __toString() {
1008                 return "{$this->getCodeString()}: {$this->getMessage()}";
1009         }
1010 }