includes/api/ApiMain.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.8+
   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
  67                 // Write modules
  68                 'purge' => 'ApiPurge',
  69                 'rollback' => 'ApiRollback',
  70                 'delete' => 'ApiDelete',
  71                 'undelete' => 'ApiUndelete',
  72                 'protect' => 'ApiProtect',
  73                 'block' => 'ApiBlock',
  74                 'unblock' => 'ApiUnblock',
  75                 'move' => 'ApiMove',
  76                 'edit' => 'ApiEditPage',
  77                 'upload' => 'ApiUpload',
  78                 'emailuser' => 'ApiEmailUser',
  79                 'watch' => 'ApiWatch',
  80                 'patrol' => 'ApiPatrol',
  81                 'import' => 'ApiImport',
  82                 'userrights' => 'ApiUserrights',
  83         );
  84
  85         /**
  86          * List of available formats: format name => format class
  87          */
  88         private static $Formats = array(
  89                 'json' => 'ApiFormatJson',
  90                 'jsonfm' => 'ApiFormatJson',
  91                 'php' => 'ApiFormatPhp',
  92                 'phpfm' => 'ApiFormatPhp',
  93                 'wddx' => 'ApiFormatWddx',
  94                 'wddxfm' => 'ApiFormatWddx',
  95                 'xml' => 'ApiFormatXml',
  96                 'xmlfm' => 'ApiFormatXml',
  97                 'yaml' => 'ApiFormatYaml',
  98                 'yamlfm' => 'ApiFormatYaml',
  99                 'rawfm' => 'ApiFormatJson',
 100                 'txt' => 'ApiFormatTxt',
 101                 'txtfm' => 'ApiFormatTxt',
 102                 'dbg' => 'ApiFormatDbg',
 103                 'dbgfm' => 'ApiFormatDbg',
 104                 'dump' => 'ApiFormatDump',
 105                 'dumpfm' => 'ApiFormatDump',
 106         );
 107
 108         /**
 109          * List of user roles that are specifically relevant to the API.
 110          * array( 'right' => array ( 'msg'    => 'Some message with a $1',
 111          *                           'params' => array ( $someVarToSubst ) ),
 112          *                          );
 113          */
 114         private static $mRights = array(
 115                 'writeapi' => array(
 116                         'msg' => 'Use of the write API',
 117                         'params' => array()
 118                 ),
 119                 'apihighlimits' => array(
 120                         '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.',
 121                         'params' => array( ApiBase::LIMIT_SML2, ApiBase::LIMIT_BIG2 )
 122                 )
 123         );
 124
 125         private $mPrinter, $mModules, $mModuleNames, $mFormats, $mFormatNames;
 126         private $mResult, $mAction, $mShowVersions, $mEnableWrite, $mRequest;
 127         private $mInternalMode, $mSquidMaxage, $mModule;
 128
 129         private $mCacheMode = 'private';
 130         private $mCacheControl = array();
 131
 132         /**
 133          * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
 134          *
 135          * @param $request object - if this is an instance of FauxRequest, errors are thrown and no printing occurs
 136          * @param $enableWrite bool should be set to true if the api may modify data
 137          */
 138         public function __construct( $request, $enableWrite = false ) {
 139                 $this->mInternalMode = ( $request instanceof FauxRequest );
 140
 141                 // Special handling for the main module: $parent === $this
 142                 parent::__construct( $this, $this->mInternalMode ? 'main_int' : 'main' );
 143
 144                 if ( !$this->mInternalMode ) {
 145                         // Impose module restrictions.
 146                         // If the current user cannot read,
 147                         // Remove all modules other than login
 148                         global $wgUser;
 149
 150                         if ( $request->getVal( 'callback' ) !== null ) {
 151                                 // JSON callback allows cross-site reads.
 152                                 // For safety, strip user credentials.
 153                                 wfDebug( "API: stripping user credentials for JSON callback\n" );
 154                                 $wgUser = new User();
 155                         }
 156                 }
 157
 158                 global $wgAPIModules; // extension modules
 159                 $this->mModules = $wgAPIModules + self::$Modules;
 160
 161                 $this->mModuleNames = array_keys( $this->mModules );
 162                 $this->mFormats = self::$Formats;
 163                 $this->mFormatNames = array_keys( $this->mFormats );
 164
 165                 $this->mResult = new ApiResult( $this );
 166                 $this->mShowVersions = false;
 167                 $this->mEnableWrite = $enableWrite;
 168
 169                 $this->mRequest = &$request;
 170
 171                 $this->mSquidMaxage = - 1; // flag for executeActionWithErrorHandling()
 172                 $this->mCommit = false;
 173         }
 174
 175         /**
 176          * Return true if the API was started by other PHP code using FauxRequest
 177          */
 178         public function isInternalMode() {
 179                 return $this->mInternalMode;
 180         }
 181
 182         /**
 183          * Return the request object that contains client's request
 184          */
 185         public function getRequest() {
 186                 return $this->mRequest;
 187         }
 188
 189         /**
 190          * Get the ApiResult object associated with current request
 191          */
 192         public function getResult() {
 193                 return $this->mResult;
 194         }
 195
 196         /**
 197          * Get the API module object. Only works after executeAction()
 198          */
 199         public function getModule() {
 200                 return $this->mModule;
 201         }
 202
 203         /**
 204          * Get the result formatter object. Only works after setupExecuteAction()
 205          */
 206         public function getPrinter() {
 207                 return $this->mPrinter;
 208         }
 209
 210         /**
 211          * Set how long the response should be cached.
 212          */
 213         public function setCacheMaxAge( $maxage ) {
 214                 $this->setCacheControl( array(
 215                         'max-age' => $maxage,
 216                         's-maxage' => $maxage
 217                 ) );
 218         }
 219
 220         /**
 221          * Set the type of caching headers which will be sent.
 222          *
 223          * @param $mode String One of:
 224          *    - 'public':     Cache this object in public caches, if the maxage or smaxage
 225          *         parameter is set, or if setCacheMaxAge() was called. If a maximum age is
 226          *         not provided by any of these means, the object will be private.
 227          *    - 'private':    Cache this object only in private client-side caches.
 228          *    - 'anon-public-user-private': Make this object cacheable for logged-out
 229          *         users, but private for logged-in users. IMPORTANT: If this is set, it must be
 230          *         set consistently for a given URL, it cannot be set differently depending on
 231          *         things like the contents of the database, or whether the user is logged in.
 232          *
 233          *  If the wiki does not allow anonymous users to read it, the mode set here
 234          *  will be ignored, and private caching headers will always be sent. In other words,
 235          *  the "public" mode is equivalent to saying that the data sent is as public as a page
 236          *  view.
 237          *
 238          *  For user-dependent data, the private mode should generally be used. The
 239          *  anon-public-user-private mode should only be used where there is a particularly
 240          *  good performance reason for caching the anonymous response, but where the
 241          *  response to logged-in users may differ, or may contain private data.
 242          *
 243          *  If this function is never called, then the default will be the private mode.
 244          */
 245         public function setCacheMode( $mode ) {
 246                 if ( !in_array( $mode, array( 'private', 'public', 'anon-public-user-private' ) ) ) {
 247                         wfDebug( __METHOD__ . ": unrecognised cache mode \"$mode\"\n" );
 248                         // Ignore for forwards-compatibility
 249                         return;
 250                 }
 251
 252                 if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
 253                         // Private wiki, only private headers
 254                         if ( $mode !== 'private' ) {
 255                                 wfDebug( __METHOD__ . ": ignoring request for $mode cache mode, private wiki\n" );
 256                                 return;
 257                         }
 258                 }
 259
 260                 wfDebug( __METHOD__ . ": setting cache mode $mode\n" );
 261                 $this->mCacheMode = $mode;
 262         }
 263
 264         /**
 265          * @deprecated Private caching is now the default, so there is usually no
 266          * need to call this function. If there is a need, you can use
 267          * $this->setCacheMode('private')
 268          */
 269         public function setCachePrivate() {
 270                 $this->setCacheMode( 'private' );
 271         }
 272
 273         /**
 274          * Set directives (key/value pairs) for the Cache-Control header.
 275          * Boolean values will be formatted as such, by including or omitting
 276          * without an equals sign.
 277          *
 278          * Cache control values set here will only be used if the cache mode is not
 279          * private, see setCacheMode().
 280          */
 281         public function setCacheControl( $directives ) {
 282                 $this->mCacheControl = $directives + $this->mCacheControl;
 283         }
 284
 285         /**
 286          * Make sure Vary: Cookie and friends are set. Use this when the output of a request
 287          * may be cached for anons but may not be cached for logged-in users.
 288          *
 289          * WARNING: This function must be called CONSISTENTLY for a given URL. This means that a
 290          * given URL must either always or never call this function; if it sometimes does and
 291          * sometimes doesn't, stuff will break.
 292          *
 293          * @deprecated Use setCacheMode( 'anon-public-user-private' )
 294          */
 295         public function setVaryCookie() {
 296                 $this->setCacheMode( 'anon-public-user-private' );
 297         }
 298
 299         /**
 300          * Create an instance of an output formatter by its name
 301          */
 302         public function createPrinterByName( $format ) {
 303                 if ( !isset( $this->mFormats[$format] ) ) {
 304                         $this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
 305                 }
 306                 return new $this->mFormats[$format] ( $this, $format );
 307         }
 308
 309         /**
 310          * Execute api request. Any errors will be handled if the API was called by the remote client.
 311          */
 312         public function execute() {
 313                 $this->profileIn();
 314                 if ( $this->mInternalMode ) {
 315                         $this->executeAction();
 316                 } else {
 317                         $this->executeActionWithErrorHandling();
 318                 }
 319
 320                 $this->profileOut();
 321         }
 322
 323         /**
 324          * Execute an action, and in case of an error, erase whatever partial results
 325          * have been accumulated, and replace it with an error message and a help screen.
 326          */
 327         protected function executeActionWithErrorHandling() {
 328                 // In case an error occurs during data output,
 329                 // clear the output buffer and print just the error information
 330                 ob_start();
 331
 332                 try {
 333                         $this->executeAction();
 334                 } catch ( Exception $e ) {
 335                         // Log it
 336                         if ( $e instanceof MWException ) {
 337                                 wfDebugLog( 'exception', $e->getLogMessage() );
 338                         }
 339
 340                         //
 341                         // Handle any kind of exception by outputing properly formatted error message.
 342                         // If this fails, an unhandled exception should be thrown so that global error
 343                         // handler will process and log it.
 344                         //
 345
 346                         $errCode = $this->substituteResultWithError( $e );
 347
 348                         // Error results should not be cached
 349                         $this->setCacheMode( 'private' );
 350
 351                         $headerStr = 'MediaWiki-API-Error: ' . $errCode;
 352                         if ( $e->getCode() === 0 ) {
 353                                 header( $headerStr );
 354                         } else {
 355                                 header( $headerStr, true, $e->getCode() );
 356                         }
 357
 358                         // Reset and print just the error message
 359                         ob_clean();
 360
 361                         // If the error occured during printing, do a printer->profileOut()
 362                         $this->mPrinter->safeProfileOut();
 363                         $this->printResult( true );
 364                 }
 365
 366                 // Send cache headers after any code which might generate an error, to
 367                 // avoid sending public cache headers for errors.
 368                 $this->sendCacheHeaders();
 369
 370                 if ( $this->mPrinter->getIsHtml() && !$this->mPrinter->isDisabled() ) {
 371                         echo wfReportTime();
 372                 }
 373
 374                 ob_end_flush();
 375         }
 376
 377         protected function sendCacheHeaders() {
 378                 if ( $this->mCacheMode == 'private' ) {
 379                         header( 'Cache-Control: private' );
 380                         return;
 381                 }
 382
 383                 if ( $this->mCacheMode == 'anon-public-user-private' ) {
 384                         global $wgUseXVO, $wgOut;
 385                         header( 'Vary: Accept-Encoding, Cookie' );
 386                         if ( $wgUseXVO ) {
 387                                 header( $wgOut->getXVO() );
 388                                 if ( $wgOut->haveCacheVaryCookies() ) {
 389                                         // Logged in, mark this request private
 390                                         header( 'Cache-Control: private' );
 391                                         return;
 392                                 }
 393                                 // Logged out, send normal public headers below
 394                         } elseif ( session_id() != '' ) {
 395                                 // Logged in or otherwise has session (e.g. anonymous users who have edited)
 396                                 // Mark request private
 397                                 header( 'Cache-Control: private' );
 398                                 return;
 399                         } // else no XVO and anonymous, send public headers below
 400                 }
 401
 402                 // If nobody called setCacheMaxAge(), use the (s)maxage parameters
 403                 if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
 404                         $this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
 405                 }
 406                 if ( !isset( $this->mCacheControl['max-age'] ) ) {
 407                         $this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
 408                 }
 409
 410                 if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
 411                         // Public cache not requested
 412                         // Sending a Vary header in this case is harmless, and protects us
 413                         // against conditional calls of setCacheMaxAge().
 414                         header( 'Cache-Control: private' );
 415                         return;
 416                 }
 417
 418                 $this->mCacheControl['public'] = true;
 419
 420                 // Send an Expires header
 421                 $maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
 422                 $expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
 423                 header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );
 424
 425                 // Construct the Cache-Control header
 426                 $ccHeader = '';
 427                 $separator = '';
 428                 foreach ( $this->mCacheControl as $name => $value ) {
 429                         if ( is_bool( $value ) ) {
 430                                 if ( $value ) {
 431                                         $ccHeader .= $separator . $name;
 432                                         $separator = ', ';
 433                                 }
 434                         } else {
 435                                 $ccHeader .= $separator . "$name=$value";
 436                                 $separator = ', ';
 437                         }
 438                 }
 439
 440                 header( "Cache-Control: $ccHeader" );
 441         }
 442
 443         /**
 444          * Replace the result data with the information about an exception.
 445          * Returns the error code
 446          */
 447         protected function substituteResultWithError( $e ) {
 448                 // Printer may not be initialized if the extractRequestParams() fails for the main module
 449                 if ( !isset ( $this->mPrinter ) ) {
 450                         // The printer has not been created yet. Try to manually get formatter value.
 451                         $value = $this->getRequest()->getVal( 'format', self::API_DEFAULT_FORMAT );
 452                         if ( !in_array( $value, $this->mFormatNames ) ) {
 453                                 $value = self::API_DEFAULT_FORMAT;
 454                         }
 455
 456                         $this->mPrinter = $this->createPrinterByName( $value );
 457                         if ( $this->mPrinter->getNeedsRawData() ) {
 458                                 $this->getResult()->setRawMode();
 459                         }
 460                 }
 461
 462                 if ( $e instanceof UsageException ) {
 463                         //
 464                         // User entered incorrect parameters - print usage screen
 465                         //
 466                         $errMessage = $e->getMessageArray();
 467
 468                         // Only print the help message when this is for the developer, not runtime
 469                         if ( $this->mPrinter->getWantsHelp() || $this->mAction == 'help' ) {
 470                                 ApiResult::setContent( $errMessage, $this->makeHelpMsg() );
 471                         }
 472
 473                 } else {
 474                         global $wgShowSQLErrors, $wgShowExceptionDetails;
 475                         //
 476                         // Something is seriously wrong
 477                         //
 478                         if ( ( $e instanceof DBQueryError ) && !$wgShowSQLErrors ) {
 479                                 $info = 'Database query error';
 480                         } else {
 481                                 $info = "Exception Caught: {$e->getMessage()}";
 482                         }
 483
 484                         $errMessage = array(
 485                                 'code' => 'internal_api_error_' . get_class( $e ),
 486                                 'info' => $info,
 487                         );
 488                         ApiResult::setContent( $errMessage, $wgShowExceptionDetails ? "\n\n{$e->getTraceAsString()}\n\n" : '' );
 489                 }
 490
 491                 $this->getResult()->reset();
 492                 $this->getResult()->disableSizeCheck();
 493                 // Re-add the id
 494                 $requestid = $this->getParameter( 'requestid' );
 495                 if ( !is_null( $requestid ) ) {
 496                         $this->getResult()->addValue( null, 'requestid', $requestid );
 497                 }
 498                 // servedby is especially useful when debugging errors
 499                 $this->getResult()->addValue( null, 'servedby', wfHostName() );
 500                 $this->getResult()->addValue( null, 'error', $errMessage );
 501
 502                 return $errMessage['code'];
 503         }
 504
 505         /**
 506          * Set up for the execution.
 507          */
 508         protected function setupExecuteAction() {
 509                 // First add the id to the top element
 510                 $requestid = $this->getParameter( 'requestid' );
 511                 if ( !is_null( $requestid ) ) {
 512                         $this->getResult()->addValue( null, 'requestid', $requestid );
 513                 }
 514                 $servedby = $this->getParameter( 'servedby' );
 515                 if ( $servedby ) {
 516                         $this->getResult()->addValue( null, 'servedby', wfHostName() );
 517                 }
 518
 519                 $params = $this->extractRequestParams();
 520
 521                 $this->mShowVersions = $params['version'];
 522                 $this->mAction = $params['action'];
 523
 524                 if ( !is_string( $this->mAction ) ) {
 525                         $this->dieUsage( 'The API requires a valid action parameter', 'unknown_action' );
 526                 }
 527
 528                 return $params;
 529         }
 530
 531         /**
 532          * Set up the module for response
 533          * @return ApiBase The module that will handle this action
 534          */
 535         protected function setupModule() {
 536                 // Instantiate the module requested by the user
 537                 $module = new $this->mModules[$this->mAction] ( $this, $this->mAction );
 538                 $this->mModule = $module;
 539
 540                 $moduleParams = $module->extractRequestParams();
 541
 542                 // Die if token required, but not provided (unless there is a gettoken parameter)
 543                 $salt = $module->getTokenSalt();
 544                 if ( $salt !== false && !isset( $moduleParams['gettoken'] ) ) {
 545                         if ( !isset( $moduleParams['token'] ) ) {
 546                                 $this->dieUsageMsg( array( 'missingparam', 'token' ) );
 547                         } else {
 548                                 global $wgUser;
 549                                 if ( !$wgUser->matchEditToken( $moduleParams['token'], $salt ) ) {
 550                                         $this->dieUsageMsg( array( 'sessionfailure' ) );
 551                                 }
 552                         }
 553                 }
 554                 return $module;
 555         }
 556
 557         /**
 558          * Check the max lag if necessary
 559          * @param $module ApiBase object: Api module being used
 560          * @param $params Array an array containing the request parameters.
 561          * @return boolean True on success, false should exit immediately
 562          */
 563         protected function checkMaxLag( $module, $params ) {
 564                 if ( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
 565                         // Check for maxlag
 566                         global $wgShowHostnames;
 567                         $maxLag = $params['maxlag'];
 568                         list( $host, $lag ) = wfGetLB()->getMaxLag();
 569                         if ( $lag > $maxLag ) {
 570                                 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
 571                                 header( 'X-Database-Lag: ' . intval( $lag ) );
 572                                 if ( $wgShowHostnames ) {
 573                                         $this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
 574                                 } else {
 575                                         $this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
 576                                 }
 577                                 return false;
 578                         }
 579                 }
 580                 return true;
 581         }
 582
 583
 584         /**
 585          * Check for sufficient permissions to execute
 586          * @param $module ApiBase An Api module
 587          */
 588         protected function checkExecutePermissions( $module ) {
 589                 global $wgUser;
 590                 if ( $module->isReadMode() && !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) &&
 591                         !$wgUser->isAllowed( 'read' ) )
 592                 {
 593                         $this->dieUsageMsg( array( 'readrequired' ) );
 594                 }
 595                 if ( $module->isWriteMode() ) {
 596                         if ( !$this->mEnableWrite ) {
 597                                 $this->dieUsageMsg( array( 'writedisabled' ) );
 598                         }
 599                         if ( !$wgUser->isAllowed( 'writeapi' ) ) {
 600                                 $this->dieUsageMsg( array( 'writerequired' ) );
 601                         }
 602                         if ( wfReadOnly() ) {
 603                                 $this->dieReadOnly();
 604                         }
 605                 }
 606         }
 607
 608         /**
 609          * Check POST for external response and setup result printer
 610          * @param $module ApiBase An Api module
 611          * @param $params Array an array with the request parameters
 612          */
 613         protected function setupExternalResponse( $module, $params ) {
 614                 // Ignore mustBePosted() for internal calls
 615                 if ( $module->mustBePosted() && !$this->mRequest->wasPosted() ) {
 616                         $this->dieUsageMsg( array( 'mustbeposted', $this->mAction ) );
 617                 }
 618
 619                 // See if custom printer is used
 620                 $this->mPrinter = $module->getCustomPrinter();
 621                 if ( is_null( $this->mPrinter ) ) {
 622                         // Create an appropriate printer
 623                         $this->mPrinter = $this->createPrinterByName( $params['format'] );
 624                 }
 625
 626                 if ( $this->mPrinter->getNeedsRawData() ) {
 627                         $this->getResult()->setRawMode();
 628                 }
 629         }
 630
 631         /**
 632          * Execute the actual module, without any error handling
 633          */
 634         protected function executeAction() {
 635                 $params = $this->setupExecuteAction();
 636                 $module = $this->setupModule();
 637
 638                 $this->checkExecutePermissions( $module );
 639
 640                 if ( !$this->checkMaxLag( $module, $params ) ) {
 641                         return;
 642                 }
 643
 644                 if ( !$this->mInternalMode ) {
 645                         $this->setupExternalResponse( $module, $params );
 646                 }
 647
 648                 // Execute
 649                 $module->profileIn();
 650                 $module->execute();
 651                 wfRunHooks( 'APIAfterExecute', array( &$module ) );
 652                 $module->profileOut();
 653
 654                 if ( !$this->mInternalMode ) {
 655                         // Print result data
 656                         $this->printResult( false );
 657                 }
 658         }
 659
 660         /**
 661          * Print results using the current printer
 662          */
 663         protected function printResult( $isError ) {
 664                 $this->getResult()->cleanUpUTF8();
 665                 $printer = $this->mPrinter;
 666                 $printer->profileIn();
 667
 668                 /**
 669                  * If the help message is requested in the default (xmlfm) format,
 670                  * tell the printer not to escape ampersands so that our links do
 671                  * not break.
 672                  */
 673                 $printer->setUnescapeAmps( ( $this->mAction == 'help' || $isError )
 674                                 && $printer->getFormat() == 'XML' && $printer->getIsHtml() );
 675
 676                 $printer->initPrinter( $isError );
 677
 678                 $printer->execute();
 679                 $printer->closePrinter();
 680                 $printer->profileOut();
 681         }
 682
 683         public function isReadMode() {
 684                 return false;
 685         }
 686
 687         /**
 688          * See ApiBase for description.
 689          */
 690         public function getAllowedParams() {
 691                 return array(
 692                         'format' => array(
 693                                 ApiBase::PARAM_DFLT => ApiMain::API_DEFAULT_FORMAT,
 694                                 ApiBase::PARAM_TYPE => $this->mFormatNames
 695                         ),
 696                         'action' => array(
 697                                 ApiBase::PARAM_DFLT => 'help',
 698                                 ApiBase::PARAM_TYPE => $this->mModuleNames
 699                         ),
 700                         'version' => false,
 701                         'maxlag'  => array(
 702                                 ApiBase::PARAM_TYPE => 'integer'
 703                         ),
 704                         'smaxage' => array(
 705                                 ApiBase::PARAM_TYPE => 'integer',
 706                                 ApiBase::PARAM_DFLT => 0
 707                         ),
 708                         'maxage' => array(
 709                                 ApiBase::PARAM_TYPE => 'integer',
 710                                 ApiBase::PARAM_DFLT => 0
 711                         ),
 712                         'requestid' => null,
 713                         'servedby'  => false,
 714                 );
 715         }
 716
 717         /**
 718          * See ApiBase for description.
 719          */
 720         public function getParamDescription() {
 721                 return array(
 722                         'format' => 'The format of the output',
 723                         'action' => 'What action you would like to perform. See below for module help',
 724                         'version' => 'When showing help, include version for each module',
 725                         'maxlag' => 'Maximum lag',
 726                         'smaxage' => 'Set the s-maxage header to this many seconds. Errors are never cached',
 727                         'maxage' => 'Set the max-age header to this many seconds. Errors are never cached',
 728                         'requestid' => 'Request ID to distinguish requests. This will just be output back to you',
 729                         'servedby' => 'Include the hostname that served the request in the results. Unconditionally shown on error',
 730                 );
 731         }
 732
 733         /**
 734          * See ApiBase for description.
 735          */
 736         public function getDescription() {
 737                 return array(
 738                         '',
 739                         '',
 740                         '******************************************************************************************',
 741                         '**                                                                                      **',
 742                         '**              This is an auto-generated MediaWiki API documentation page              **',
 743                         '**                                                                                      **',
 744                         '**                            Documentation and Examples:                               **',
 745                         '**                         http://www.mediawiki.org/wiki/API                            **',
 746                         '**                                                                                      **',
 747                         '******************************************************************************************',
 748                         '',
 749                         'Status:                All features shown on this page should be working, but the API',
 750                         '                       is still in active development, and  may change at any time.',
 751                         '                       Make sure to monitor our mailing list for any updates',
 752                         '',
 753                         'Documentation:         http://www.mediawiki.org/wiki/API',
 754                         'Mailing list:          http://lists.wikimedia.org/mailman/listinfo/mediawiki-api',
 755                         'Api Announcements:     http://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce',
 756                         'Bugs & Requests:       http://bugzilla.wikimedia.org/buglist.cgi?component=API&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&order=bugs.delta_ts',
 757                         '',
 758                         '',
 759                         '',
 760                         '',
 761                         '',
 762                 );
 763         }
 764
 765         public function getPossibleErrors() {
 766                 return array_merge( parent::getPossibleErrors(), array(
 767                         array( 'readonlytext' ),
 768                         array( 'code' => 'unknown_format', 'info' => 'Unrecognized format: format' ),
 769                         array( 'code' => 'unknown_action', 'info' => 'The API requires a valid action parameter' ),
 770                         array( 'code' => 'maxlag', 'info' => 'Waiting for host: x seconds lagged' ),
 771                         array( 'code' => 'maxlag', 'info' => 'Waiting for a database server: x seconds lagged' ),
 772                 ) );
 773         }
 774
 775         /**
 776          * Returns an array of strings with credits for the API
 777          */
 778         protected function getCredits() {
 779                 return array(
 780                         'API developers:',
 781                         '    Roan Kattouw <Firstname>.<Lastname>@home.nl (lead developer Sep 2007-present)',
 782                         '    Victor Vasiliev - vasilvv at gee mail dot com',
 783                         '    Bryan Tong Minh - bryan . tongminh @ gmail . com',
 784                         '    Sam Reed - sam @ reedyboy . net',
 785                         '    Yuri Astrakhan <Firstname><Lastname>@gmail.com (creator, lead developer Sep 2006-Sep 2007)',
 786                         '',
 787                         'Please send your comments, suggestions and questions to mediawiki-api@lists.wikimedia.org',
 788                         'or file a bug report at http://bugzilla.wikimedia.org/'
 789                 );
 790         }
 791         /**
 792          * Sets whether the pretty-printer should format *bold* and $italics$
 793          */
 794         public function setHelp( $help = true ) {
 795                 $this->mPrinter->setHelp( $help );
 796         }
 797
 798         /**
 799          * Override the parent to generate help messages for all available modules.
 800          */
 801         public function makeHelpMsg() {
 802                 global $wgMemc, $wgAPICacheHelp, $wgAPICacheHelpTimeout;
 803                 $this->setHelp();
 804                 // Get help text from cache if present
 805                 $key = wfMemcKey( 'apihelp', $this->getModuleName(),
 806                         SpecialVersion::getVersion( 'nodb' ) .
 807                         $this->getMain()->getShowVersions() );
 808                 if ( $wgAPICacheHelp ) {
 809                         $cached = $wgMemc->get( $key );
 810                         if ( $cached ) {
 811                                 return $cached;
 812                         }
 813                 }
 814                 $retval = $this->reallyMakeHelpMsg();
 815                 if ( $wgAPICacheHelp ) {
 816                         $wgMemc->set( $key, $retval, $wgAPICacheHelpTimeout );
 817                 }
 818                 return $retval;
 819         }
 820
 821         public function reallyMakeHelpMsg() {
 822                 $this->setHelp();
 823
 824                 // Use parent to make default message for the main module
 825                 $msg = parent::makeHelpMsg();
 826
 827                 $astriks = str_repeat( '*** ', 10 );
 828                 $msg .= "\n\n$astriks Modules  $astriks\n\n";
 829                 foreach ( $this->mModules as $moduleName => $unused ) {
 830                         $module = new $this->mModules[$moduleName] ( $this, $moduleName );
 831                         $msg .= self::makeHelpMsgHeader( $module, 'action' );
 832                         $msg2 = $module->makeHelpMsg();
 833                         if ( $msg2 !== false ) {
 834                                 $msg .= $msg2;
 835                         }
 836                         $msg .= "\n";
 837                 }
 838
 839                 $msg .= "\n$astriks Permissions $astriks\n\n";
 840                 foreach ( self::$mRights as $right => $rightMsg ) {
 841                         $groups = User::getGroupsWithPermission( $right );
 842                         $msg .= "* " . $right . " *\n  " . wfMsgReplaceArgs( $rightMsg[ 'msg' ], $rightMsg[ 'params' ] ) .
 843                                                 "\nGranted to:\n  " . str_replace( '*', 'all', implode( ', ', $groups ) ) . "\n\n";
 844
 845                 }
 846
 847                 $msg .= "\n$astriks Formats  $astriks\n\n";
 848                 foreach ( $this->mFormats as $formatName => $unused ) {
 849                         $module = $this->createPrinterByName( $formatName );
 850                         $msg .= self::makeHelpMsgHeader( $module, 'format' );
 851                         $msg2 = $module->makeHelpMsg();
 852                         if ( $msg2 !== false ) {
 853                                 $msg .= $msg2;
 854                         }
 855                         $msg .= "\n";
 856                 }
 857
 858                 $msg .= "\n*** Credits: ***\n   " . implode( "\n   ", $this->getCredits() ) . "\n";
 859
 860                 return $msg;
 861         }
 862
 863         public static function makeHelpMsgHeader( $module, $paramName ) {
 864                 $modulePrefix = $module->getModulePrefix();
 865                 if ( strval( $modulePrefix ) !== '' ) {
 866                         $modulePrefix = "($modulePrefix) ";
 867                 }
 868
 869                 return "* $paramName={$module->getModuleName()} $modulePrefix*";
 870         }
 871
 872         private $mIsBot = null;
 873         private $mIsSysop = null;
 874         private $mCanApiHighLimits = null;
 875
 876         /**
 877          * Returns true if the currently logged in user is a bot, false otherwise
 878          * OBSOLETE, use canApiHighLimits() instead
 879          */
 880         public function isBot() {
 881                 if ( !isset( $this->mIsBot ) ) {
 882                         global $wgUser;
 883                         $this->mIsBot = $wgUser->isAllowed( 'bot' );
 884                 }
 885                 return $this->mIsBot;
 886         }
 887
 888         /**
 889          * Similar to isBot(), this method returns true if the logged in user is
 890          * a sysop, and false if not.
 891          * OBSOLETE, use canApiHighLimits() instead
 892          */
 893         public function isSysop() {
 894                 if ( !isset( $this->mIsSysop ) ) {
 895                         global $wgUser;
 896                         $this->mIsSysop = in_array( 'sysop', $wgUser->getGroups() );
 897                 }
 898
 899                 return $this->mIsSysop;
 900         }
 901
 902         /**
 903          * Check whether the current user is allowed to use high limits
 904          * @return bool
 905          */
 906         public function canApiHighLimits() {
 907                 if ( !isset( $this->mCanApiHighLimits ) ) {
 908                         global $wgUser;
 909                         $this->mCanApiHighLimits = $wgUser->isAllowed( 'apihighlimits' );
 910                 }
 911
 912                 return $this->mCanApiHighLimits;
 913         }
 914
 915         /**
 916          * Check whether the user wants us to show version information in the API help
 917          * @return bool
 918          */
 919         public function getShowVersions() {
 920                 return $this->mShowVersions;
 921         }
 922
 923         /**
 924          * Returns the version information of this file, plus it includes
 925          * the versions for all files that are not callable proper API modules
 926          */
 927         public function getVersion() {
 928                 $vers = array ();
 929                 $vers[] = 'MediaWiki: ' . SpecialVersion::getVersion() . "\n    http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/";
 930                 $vers[] = __CLASS__ . ': $Id$';
 931                 $vers[] = ApiBase::getBaseVersion();
 932                 $vers[] = ApiFormatBase::getBaseVersion();
 933                 $vers[] = ApiQueryBase::getBaseVersion();
 934                 return $vers;
 935         }
 936
 937         /**
 938          * Add or overwrite a module in this ApiMain instance. Intended for use by extending
 939          * classes who wish to add their own modules to their lexicon or override the
 940          * behavior of inherent ones.
 941          *
 942          * @param $mdlName String The identifier for this module.
 943          * @param $mdlClass String The class where this module is implemented.
 944          */
 945         protected function addModule( $mdlName, $mdlClass ) {
 946                 $this->mModules[$mdlName] = $mdlClass;
 947         }
 948
 949         /**
 950          * Add or overwrite an output format for this ApiMain. Intended for use by extending
 951          * classes who wish to add to or modify current formatters.
 952          *
 953          * @param $fmtName The identifier for this format.
 954          * @param $fmtClass The class implementing this format.
 955          */
 956         protected function addFormat( $fmtName, $fmtClass ) {
 957                 $this->mFormats[$fmtName] = $fmtClass;
 958         }
 959
 960         /**
 961          * Get the array mapping module names to class names
 962          */
 963         function getModules() {
 964                 return $this->mModules;
 965         }
 966 }
 967
 968 /**
 969  * This exception will be thrown when dieUsage is called to stop module execution.
 970  * The exception handling code will print a help screen explaining how this API may be used.
 971  *
 972  * @ingroup API
 973  */
 974 class UsageException extends Exception {
 975
 976         private $mCodestr;
 977         private $mExtraData;
 978
 979         public function __construct( $message, $codestr, $code = 0, $extradata = null ) {
 980                 parent::__construct( $message, $code );
 981                 $this->mCodestr = $codestr;
 982                 $this->mExtraData = $extradata;
 983         }
 984
 985         public function getCodeString() {
 986                 return $this->mCodestr;
 987         }
 988
 989         public function getMessageArray() {
 990                 $result = array(
 991                         'code' => $this->mCodestr,
 992                         'info' => $this->getMessage()
 993                 );
 994                 if ( is_array( $this->mExtraData ) ) {
 995                         $result = array_merge( $result, $this->mExtraData );
 996                 }
 997                 return $result;
 998         }
 999
1000         public function __toString() {
1001                 return "{$this->getCodeString()}: {$this->getMessage()}";
1002         }
1003 }