includes/api/ApiBase.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.8+
   4  *
   5  * Created on Sep 5, 2006
   6  *
   7  * Copyright © 2006, 2010 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  */
  26
  27 /**
  28  * This abstract class implements many basic API functions, and is the base of
  29  * all API classes.
  30  * The class functions are divided into several areas of functionality:
  31  *
  32  * Module parameters: Derived classes can define getAllowedParams() to specify
  33  *      which parameters to expect,h ow to parse and validate them.
  34  *
  35  * Profiling: various methods to allow keeping tabs on various tasks and their
  36  *      time costs
  37  *
  38  * Self-documentation: code to allow the API to document its own state
  39  *
  40  * @ingroup API
  41  */
  42 abstract class ApiBase {
  43
  44         // These constants allow modules to specify exactly how to treat incoming parameters.
  45
  46         const PARAM_DFLT = 0; // Default value of the parameter
  47         const PARAM_ISMULTI = 1; // Boolean, do we accept more than one item for this parameter (e.g.: titles)?
  48         const PARAM_TYPE = 2; // Can be either a string type (e.g.: 'integer') or an array of allowed values
  49         const PARAM_MAX = 3; // Max value allowed for a parameter. Only applies if TYPE='integer'
  50         const PARAM_MAX2 = 4; // Max value allowed for a parameter for bots and sysops. Only applies if TYPE='integer'
  51         const PARAM_MIN = 5; // Lowest value allowed for a parameter. Only applies if TYPE='integer'
  52         const PARAM_ALLOW_DUPLICATES = 6; // Boolean, do we allow the same value to be set more than once when ISMULTI=true
  53         const PARAM_DEPRECATED = 7; // Boolean, is the parameter deprecated (will show a warning)
  54         const PARAM_REQUIRED = 8; // Boolean, is the parameter required?
  55
  56         const LIMIT_BIG1 = 500; // Fast query, std user limit
  57         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  58         const LIMIT_SML1 = 50; // Slow query, std user limit
  59         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  60
  61         private $mMainModule, $mModuleName, $mModulePrefix;
  62         private $mParamCache = array();
  63
  64         /**
  65          * Constructor
  66          * @param $mainModule ApiMain object
  67          * @param $moduleName string Name of this module
  68          * @param $modulePrefix string Prefix to use for parameter names
  69          */
  70         public function __construct( $mainModule, $moduleName, $modulePrefix = '' ) {
  71                 $this->mMainModule = $mainModule;
  72                 $this->mModuleName = $moduleName;
  73                 $this->mModulePrefix = $modulePrefix;
  74         }
  75
  76         /*****************************************************************************
  77          * ABSTRACT METHODS                                                          *
  78          *****************************************************************************/
  79
  80         /**
  81          * Evaluates the parameters, performs the requested query, and sets up
  82          * the result. Concrete implementations of ApiBase must override this
  83          * method to provide whatever functionality their module offers.
  84          * Implementations must not produce any output on their own and are not
  85          * expected to handle any errors.
  86          *
  87          * The execute() method will be invoked directly by ApiMain immediately
  88          * before the result of the module is output. Aside from the
  89          * constructor, implementations should assume that no other methods
  90          * will be called externally on the module before the result is
  91          * processed.
  92          *
  93          * The result data should be stored in the ApiResult object available
  94          * through getResult().
  95          */
  96         public abstract function execute();
  97
  98         /**
  99          * Returns a string that identifies the version of the extending class.
 100          * Typically includes the class name, the svn revision, timestamp, and
 101          * last author. Usually done with SVN's Id keyword
 102          * @return string
 103          */
 104         public abstract function getVersion();
 105
 106         /**
 107          * Get the name of the module being executed by this instance
 108          * @return string
 109          */
 110         public function getModuleName() {
 111                 return $this->mModuleName;
 112         }
 113
 114         /**
 115          * Get parameter prefix (usually two letters or an empty string).
 116          * @return string
 117          */
 118         public function getModulePrefix() {
 119                 return $this->mModulePrefix;
 120         }
 121
 122         /**
 123          * Get the name of the module as shown in the profiler log
 124          * @return string
 125          */
 126         public function getModuleProfileName( $db = false ) {
 127                 if ( $db ) {
 128                         return 'API:' . $this->mModuleName . '-DB';
 129                 } else {
 130                         return 'API:' . $this->mModuleName;
 131                 }
 132         }
 133
 134         /**
 135          * Get the main module
 136          * @return ApiMain object
 137          */
 138         public function getMain() {
 139                 return $this->mMainModule;
 140         }
 141
 142         /**
 143          * Returns true if this module is the main module ($this === $this->mMainModule),
 144          * false otherwise.
 145          * @return bool
 146          */
 147         public function isMain() {
 148                 return $this === $this->mMainModule;
 149         }
 150
 151         /**
 152          * Get the result object
 153          * @return ApiResult
 154          */
 155         public function getResult() {
 156                 // Main module has getResult() method overriden
 157                 // Safety - avoid infinite loop:
 158                 if ( $this->isMain() ) {
 159                         ApiBase::dieDebug( __METHOD__, 'base method was called on main module. ' );
 160                 }
 161                 return $this->getMain()->getResult();
 162         }
 163
 164         /**
 165          * Get the result data array (read-only)
 166          * @return array
 167          */
 168         public function getResultData() {
 169                 return $this->getResult()->getData();
 170         }
 171
 172         /**
 173          * Set warning section for this module. Users should monitor this
 174          * section to notice any changes in API. Multiple calls to this
 175          * function will result in the warning messages being separated by
 176          * newlines
 177          * @param $warning string Warning message
 178          */
 179         public function setWarning( $warning ) {
 180                 $data = $this->getResult()->getData();
 181                 if ( isset( $data['warnings'][$this->getModuleName()] ) ) {
 182                         // Don't add duplicate warnings
 183                         $warn_regex = preg_quote( $warning, '/' );
 184                         if ( preg_match( "/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*'] ) )
 185                         {
 186                                 return;
 187                         }
 188                         $oldwarning = $data['warnings'][$this->getModuleName()]['*'];
 189                         // If there is a warning already, append it to the existing one
 190                         $warning = "$oldwarning\n$warning";
 191                         $this->getResult()->unsetValue( 'warnings', $this->getModuleName() );
 192                 }
 193                 $msg = array();
 194                 ApiResult::setContent( $msg, $warning );
 195                 $this->getResult()->disableSizeCheck();
 196                 $this->getResult()->addValue( 'warnings', $this->getModuleName(), $msg );
 197                 $this->getResult()->enableSizeCheck();
 198         }
 199
 200         /**
 201          * If the module may only be used with a certain format module,
 202          * it should override this method to return an instance of that formatter.
 203          * A value of null means the default format will be used.
 204          * @return mixed instance of a derived class of ApiFormatBase, or null
 205          */
 206         public function getCustomPrinter() {
 207                 return null;
 208         }
 209
 210         /**
 211          * Generates help message for this module, or false if there is no description
 212          * @return mixed string or false
 213          */
 214         public function makeHelpMsg() {
 215                 static $lnPrfx = "\n  ";
 216
 217                 $msg = $this->getDescription();
 218
 219                 if ( $msg !== false ) {
 220
 221                         if ( !is_array( $msg ) ) {
 222                                 $msg = array(
 223                                         $msg
 224                                 );
 225                         }
 226                         $msg = $lnPrfx . implode( $lnPrfx, $msg ) . "\n";
 227
 228                         if ( $this->isReadMode() ) {
 229                                 $msg .= "\nThis module requires read rights";
 230                         }
 231                         if ( $this->isWriteMode() ) {
 232                                 $msg .= "\nThis module requires write rights";
 233                         }
 234                         if ( $this->mustBePosted() ) {
 235                                 $msg .= "\nThis module only accepts POST requests";
 236                         }
 237                         if ( $this->isReadMode() || $this->isWriteMode() ||
 238                                         $this->mustBePosted() )
 239                         {
 240                                 $msg .= "\n";
 241                         }
 242
 243                         // Parameters
 244                         $paramsMsg = $this->makeHelpMsgParameters();
 245                         if ( $paramsMsg !== false ) {
 246                                 $msg .= "Parameters:\n$paramsMsg";
 247                         }
 248
 249                         // Examples
 250                         $examples = $this->getExamples();
 251                         if ( $examples !== false ) {
 252                                 if ( !is_array( $examples ) ) {
 253                                         $examples = array(
 254                                                 $examples
 255                                         );
 256                                 }
 257
 258                                 if ( count( $examples ) > 0 ) {
 259                                         $msg .= 'Example' . ( count( $examples ) > 1 ? 's' : '' ) . ":\n  ";
 260                                         $msg .= implode( $lnPrfx, $examples ) . "\n";
 261                                 }
 262                         }
 263
 264                         if ( $this->getMain()->getShowVersions() ) {
 265                                 $versions = $this->getVersion();
 266                                 $pattern = '/(\$.*) ([0-9a-z_]+\.php) (.*\$)/i';
 267                                 $callback = array( $this, 'makeHelpMsg_callback' );
 268
 269                                 if ( is_array( $versions ) ) {
 270                                         foreach ( $versions as &$v ) {
 271                                                 $v = preg_replace_callback( $pattern, $callback, $v );
 272                                         }
 273                                         $versions = implode( "\n  ", $versions );
 274                                 } else {
 275                                         $versions = preg_replace_callback( $pattern, $callback, $versions );
 276                                 }
 277
 278                                 $msg .= "Version:\n  $versions\n";
 279                         }
 280                 }
 281
 282                 return $msg;
 283         }
 284
 285         /**
 286          * Generates the parameter descriptions for this module, to be displayed in the
 287          * module's help.
 288          * @return string
 289          */
 290         public function makeHelpMsgParameters() {
 291                 $params = $this->getFinalParams();
 292                 if ( $params ) {
 293
 294                         $paramsDescription = $this->getFinalParamDescription();
 295                         $msg = '';
 296                         $paramPrefix = "\n" . str_repeat( ' ', 19 );
 297                         foreach ( $params as $paramName => $paramSettings ) {
 298                                 $desc = isset( $paramsDescription[$paramName] ) ? $paramsDescription[$paramName] : '';
 299                                 if ( is_array( $desc ) ) {
 300                                         $desc = implode( $paramPrefix, $desc );
 301                                 }
 302
 303                                 if ( !is_array( $paramSettings ) ) {
 304                                         $paramSettings = array(
 305                                                 self::PARAM_DFLT => $paramSettings,
 306                                         );
 307                                 }
 308
 309                                 $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ?
 310                                         $paramSettings[self::PARAM_DEPRECATED] : false;
 311                                 if ( $deprecated ) {
 312                                         $desc = "DEPRECATED! $desc";
 313                                 }
 314
 315                                 $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ?
 316                                         $paramSettings[self::PARAM_REQUIRED] : false;
 317                                 if ( $required ) {
 318                                         $desc .= $paramPrefix . "This parameter is required";
 319                                 }
 320
 321                                 $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 322                                 if ( isset( $type ) ) {
 323                                         if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 324                                                 $prompt = 'Values (separate with \'|\'): ';
 325                                         } else {
 326                                                 $prompt = 'One value: ';
 327                                         }
 328
 329                                         if ( is_array( $type ) ) {
 330                                                 $choices = array();
 331                                                 $nothingPrompt = false;
 332                                                 foreach ( $type as $t ) {
 333                                                         if ( $t === '' ) {
 334                                                                 $nothingPrompt = 'Can be empty, or ';
 335                                                         } else {
 336                                                                 $choices[] =  $t;
 337                                                         }
 338                                                 }
 339                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt . implode( ', ', $choices );
 340                                         } else {
 341                                                 switch ( $type ) {
 342                                                         case 'namespace':
 343                                                                 // Special handling because namespaces are type-limited, yet they are not given
 344                                                                 $desc .= $paramPrefix . $prompt . implode( ', ', MWNamespace::getValidNamespaces() );
 345                                                                 break;
 346                                                         case 'limit':
 347                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]}";
 348                                                                 if ( isset( $paramSettings[self::PARAM_MAX2] ) ) {
 349                                                                         $desc .= " ({$paramSettings[self::PARAM_MAX2]} for bots)";
 350                                                                 }
 351                                                                 $desc .= ' allowed';
 352                                                                 break;
 353                                                         case 'integer':
 354                                                                 $hasMin = isset( $paramSettings[self::PARAM_MIN] );
 355                                                                 $hasMax = isset( $paramSettings[self::PARAM_MAX] );
 356                                                                 if ( $hasMin || $hasMax ) {
 357                                                                         if ( !$hasMax ) {
 358                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self::PARAM_MIN]}";
 359                                                                         } elseif ( !$hasMin ) {
 360                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self::PARAM_MAX]}";
 361                                                                         } else {
 362                                                                                 $intRangeStr = "The value must be between {$paramSettings[self::PARAM_MIN]} and {$paramSettings[self::PARAM_MAX]}";
 363                                                                         }
 364
 365                                                                         $desc .= $paramPrefix . $intRangeStr;
 366                                                                 }
 367                                                                 break;
 368                                                 }
 369                                         }
 370                                 }
 371
 372                                 $default = is_array( $paramSettings ) ? ( isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null ) : $paramSettings;
 373                                 if ( !is_null( $default ) && $default !== false ) {
 374                                         $desc .= $paramPrefix . "Default: $default";
 375                                 }
 376
 377                                 $msg .= sprintf( "  %-14s - %s\n", $this->encodeParamName( $paramName ), $desc );
 378                         }
 379                         return $msg;
 380
 381                 } else {
 382                         return false;
 383                 }
 384         }
 385
 386         /**
 387          * Callback for preg_replace_callback() call in makeHelpMsg().
 388          * Replaces a source file name with a link to ViewVC
 389          */
 390         public function makeHelpMsg_callback( $matches ) {
 391                 global $wgAutoloadClasses, $wgAutoloadLocalClasses;
 392                 if ( isset( $wgAutoloadLocalClasses[get_class( $this )] ) ) {
 393                         $file = $wgAutoloadLocalClasses[get_class( $this )];
 394                 } elseif ( isset( $wgAutoloadClasses[get_class( $this )] ) ) {
 395                         $file = $wgAutoloadClasses[get_class( $this )];
 396                 }
 397
 398                 // Do some guesswork here
 399                 $path = strstr( $file, 'includes/api/' );
 400                 if ( $path === false ) {
 401                         $path = strstr( $file, 'extensions/' );
 402                 } else {
 403                         $path = 'phase3/' . $path;
 404                 }
 405
 406                 // Get the filename from $matches[2] instead of $file
 407                 // If they're not the same file, they're assumed to be in the
 408                 // same directory
 409                 // This is necessary to make stuff like ApiMain::getVersion()
 410                 // returning the version string for ApiBase work
 411                 if ( $path ) {
 412                         return "{$matches[0]}\n   http://svn.wikimedia.org/" .
 413                                 "viewvc/mediawiki/trunk/" . dirname( $path ) .
 414                                 "/{$matches[2]}";
 415                 }
 416                 return $matches[0];
 417         }
 418
 419         /**
 420          * Returns the description string for this module
 421          * @return mixed string or array of strings
 422          */
 423         protected function getDescription() {
 424                 return false;
 425         }
 426
 427         /**
 428          * Returns usage examples for this module. Return null if no examples are available.
 429          * @return mixed string or array of strings
 430          */
 431         protected function getExamples() {
 432                 return false;
 433         }
 434
 435         /**
 436          * Returns an array of allowed parameters (parameter name) => (default
 437          * value) or (parameter name) => (array with PARAM_* constants as keys)
 438          * Don't call this function directly: use getFinalParams() to allow
 439          * hooks to modify parameters as needed.
 440          * @return array
 441          */
 442         protected function getAllowedParams() {
 443                 return false;
 444         }
 445
 446         /**
 447          * Returns an array of parameter descriptions.
 448          * Don't call this functon directly: use getFinalParamDescription() to
 449          * allow hooks to modify descriptions as needed.
 450          * @return array
 451          */
 452         protected function getParamDescription() {
 453                 return false;
 454         }
 455
 456         /**
 457          * Get final list of parameters, after hooks have had a chance to
 458          * tweak it as needed.
 459          * @return array
 460          */
 461         public function getFinalParams() {
 462                 $params = $this->getAllowedParams();
 463                 wfRunHooks( 'APIGetAllowedParams', array( &$this, &$params ) );
 464                 return $params;
 465         }
 466
 467         /**
 468          * Get final description, after hooks have had a chance to tweak it as
 469          * needed.
 470          * @return array
 471          */
 472         public function getFinalParamDescription() {
 473                 $desc = $this->getParamDescription();
 474                 wfRunHooks( 'APIGetParamDescription', array( &$this, &$desc ) );
 475                 return $desc;
 476         }
 477
 478         /**
 479          * This method mangles parameter name based on the prefix supplied to the constructor.
 480          * Override this method to change parameter name during runtime
 481          * @param $paramName string Parameter name
 482          * @return string Prefixed parameter name
 483          */
 484         public function encodeParamName( $paramName ) {
 485                 return $this->mModulePrefix . $paramName;
 486         }
 487
 488         /**
 489          * Using getAllowedParams(), this function makes an array of the values
 490          * provided by the user, with key being the name of the variable, and
 491          * value - validated value from user or default. limits will not be
 492          * parsed if $parseLimit is set to false; use this when the max
 493          * limit is not definitive yet, e.g. when getting revisions.
 494          * @param $parseLimit Boolean: true by default
 495          * @return array
 496          */
 497         public function extractRequestParams( $parseLimit = true ) {
 498                 // Cache parameters, for performance and to avoid bug 24564.
 499                 if ( !isset( $this->mParamCache[$parseLimit] ) ) {
 500                         $params = $this->getFinalParams();
 501                         $results = array();
 502
 503                         if ( $params ) { // getFinalParams() can return false
 504                                 foreach ( $params as $paramName => $paramSettings ) {
 505                                         $results[$paramName] = $this->getParameterFromSettings(
 506                                                 $paramName, $paramSettings, $parseLimit );
 507                                 }
 508                         }
 509                         $this->mParamCache[$parseLimit] = $results;
 510                 }
 511                 return $this->mParamCache[$parseLimit];
 512         }
 513
 514         /**
 515          * Get a value for the given parameter
 516          * @param $paramName string Parameter name
 517          * @param $parseLimit bool see extractRequestParams()
 518          * @return mixed Parameter value
 519          */
 520         protected function getParameter( $paramName, $parseLimit = true ) {
 521                 $params = $this->getFinalParams();
 522                 $paramSettings = $params[$paramName];
 523                 return $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 524         }
 525
 526         /**
 527          * Die if none or more than one of a certain set of parameters is set and not false.
 528          * @param $params array of parameter names
 529          */
 530         public function requireOnlyOneParameter( $params ) {
 531                 $required = func_get_args();
 532                 array_shift( $required );
 533
 534                 $intersection = array_intersect( array_keys( array_filter( $params,
 535                                 create_function( '$x', 'return !is_null($x) && $x !== false;' )
 536                         ) ), $required );
 537                 if ( count( $intersection ) > 1 ) {
 538                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 539                 } elseif ( count( $intersection ) == 0 ) {
 540                         $this->dieUsage( 'One of the parameters ' . implode( ', ', $required ) . ' is required', 'missingparam' );
 541                 }
 542         }
 543
 544         /**
 545          * @deprecated use MWNamespace::getValidNamespaces()
 546          */
 547         public static function getValidNamespaces() {
 548                 return MWNamespace::getValidNamespaces();
 549         }
 550
 551         /**
 552          * Return true if we're to watch the page, false if not, null if no change.
 553          * @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 554          * @param $titleObj Title the page under consideration
 555          * @param $userOption The user option to consider when $watchlist=preferences.
 556          *      If not set will magically default to either watchdefault or watchcreations
 557          * @returns mixed
 558          */
 559         protected function getWatchlistValue ( $watchlist, $titleObj, $userOption = null ) {
 560                 global $wgUser;
 561                 switch ( $watchlist ) {
 562                         case 'watch':
 563                                 return true;
 564
 565                         case 'unwatch':
 566                                 return false;
 567
 568                         case 'preferences':
 569                                 # If the user is already watching, don't bother checking
 570                                 if ( $titleObj->userIsWatching() ) {
 571                                         return null;
 572                                 }
 573                                 # If no user option was passed, use watchdefault or watchcreation
 574                                 if ( is_null( $userOption ) ) {
 575                                         $userOption = $titleObj->exists()
 576                                                 ? 'watchdefault' : 'watchcreations';
 577                                 }
 578                                 # If the corresponding user option is true, watch, else no change
 579                                 return $wgUser->getOption( $userOption ) ? true : null;
 580
 581                         case 'nochange':
 582                                 return null;
 583
 584                         default:
 585                                 return null;
 586                 }
 587         }
 588
 589         /**
 590          * Set a watch (or unwatch) based the based on a watchlist parameter.
 591          * @param $watch String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 592          * @param $titleObj Title the article's title to change
 593          * @param $userOption The user option to consider when $watch=preferences
 594          */
 595         protected function setWatch ( $watch, $titleObj, $userOption = null ) {
 596                 $value = $this->getWatchlistValue( $watch, $titleObj, $userOption );
 597                 if ( $value === null ) {
 598                         return;
 599                 }
 600
 601                 $articleObj = new Article( $titleObj );
 602                 if ( $value ) {
 603                         $articleObj->doWatch();
 604                 } else {
 605                         $articleObj->doUnwatch();
 606                 }
 607         }
 608
 609         /**
 610          * Using the settings determine the value for the given parameter
 611          *
 612          * @param $paramName String: parameter name
 613          * @param $paramSettings Mixed: default value or an array of settings
 614          *  using PARAM_* constants.
 615          * @param $parseLimit Boolean: parse limit?
 616          * @return mixed Parameter value
 617          */
 618         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 619                 // Some classes may decide to change parameter names
 620                 $encParamName = $this->encodeParamName( $paramName );
 621
 622                 if ( !is_array( $paramSettings ) ) {
 623                         $default = $paramSettings;
 624                         $multi = false;
 625                         $type = gettype( $paramSettings );
 626                         $dupes = false;
 627                         $deprecated = false;
 628                         $required = false;
 629                 } else {
 630                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 631                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 632                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 633                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 634                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 635                         $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ? $paramSettings[self::PARAM_REQUIRED] : false;
 636
 637                         // When type is not given, and no choices, the type is the same as $default
 638                         if ( !isset( $type ) ) {
 639                                 if ( isset( $default ) ) {
 640                                         $type = gettype( $default );
 641                                 } else {
 642                                         $type = 'NULL'; // allow everything
 643                                 }
 644                         }
 645                 }
 646
 647                 if ( $type == 'boolean' ) {
 648                         if ( isset( $default ) && $default !== false ) {
 649                                 // Having a default value of anything other than 'false' is pointless
 650                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 651                         }
 652
 653                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 654                 } else {
 655                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 656
 657                         if ( isset( $value ) && $type == 'namespace' ) {
 658                                 $type = MWNamespace::getValidNamespaces();
 659                         }
 660                 }
 661
 662                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 663                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 664                 }
 665
 666                 // More validation only when choices were not given
 667                 // choices were validated in parseMultiValue()
 668                 if ( isset( $value ) ) {
 669                         if ( !is_array( $type ) ) {
 670                                 switch ( $type ) {
 671                                         case 'NULL': // nothing to do
 672                                                 break;
 673                                         case 'string':
 674                                                 if ( $required && $value === '' ) {
 675                                                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 676                                                 }
 677
 678                                                 break;
 679                                         case 'integer': // Force everything using intval() and optionally validate limits
 680
 681                                                 $value = is_array( $value ) ? array_map( 'intval', $value ) : intval( $value );
 682                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 683                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 684
 685                                                 if ( !is_null( $min ) || !is_null( $max ) ) {
 686                                                         $values = is_array( $value ) ? $value : array( $value );
 687                                                         foreach ( $values as &$v ) {
 688                                                                 $this->validateLimit( $paramName, $v, $min, $max );
 689                                                         }
 690                                                 }
 691                                                 break;
 692                                         case 'limit':
 693                                                 if ( !$parseLimit ) {
 694                                                         // Don't do any validation whatsoever
 695                                                         break;
 696                                                 }
 697                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 698                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 699                                                 }
 700                                                 if ( $multi ) {
 701                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 702                                                 }
 703                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 704                                                 if ( $value == 'max' ) {
 705                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 706                                                         $this->getResult()->setParsedLimit( $this->getModuleName(), $value );
 707                                                 } else {
 708                                                         $value = intval( $value );
 709                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 710                                                 }
 711                                                 break;
 712                                         case 'boolean':
 713                                                 if ( $multi ) {
 714                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 715                                                 }
 716                                                 break;
 717                                         case 'timestamp':
 718                                                 if ( $multi ) {
 719                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 720                                                 }
 721                                                 $value = wfTimestamp( TS_UNIX, $value );
 722                                                 if ( $value === 0 ) {
 723                                                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}" );
 724                                                 }
 725                                                 $value = wfTimestamp( TS_MW, $value );
 726                                                 break;
 727                                         case 'user':
 728                                                 if ( !is_array( $value ) ) {
 729                                                         $value = array( $value );
 730                                                 }
 731
 732                                                 foreach ( $value as $key => $val ) {
 733                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 734                                                         if ( is_null( $title ) ) {
 735                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 736                                                         }
 737                                                         $value[$key] = $title->getText();
 738                                                 }
 739
 740                                                 if ( !$multi ) {
 741                                                         $value = $value[0];
 742                                                 }
 743                                                 break;
 744                                         default:
 745                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 746                                 }
 747                         }
 748
 749                         // Throw out duplicates if requested
 750                         if ( is_array( $value ) && !$dupes ) {
 751                                 $value = array_unique( $value );
 752                         }
 753
 754                         // Set a warning if a deprecated parameter has been passed
 755                         if ( $deprecated && $value !== false ) {
 756                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 757                         }
 758                 } else if ( $required ) {
 759                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 760                 }
 761
 762                 return $value;
 763         }
 764
 765         /**
 766          * Return an array of values that were given in a 'a|b|c' notation,
 767          * after it optionally validates them against the list allowed values.
 768          *
 769          * @param $valueName string The name of the parameter (for error
 770          *  reporting)
 771          * @param $value mixed The value being parsed
 772          * @param $allowMultiple bool Can $value contain more than one value
 773          *  separated by '|'?
 774          * @param $allowedValues mixed An array of values to check against. If
 775          *  null, all values are accepted.
 776          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 777          */
 778         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 779                 if ( trim( $value ) === '' && $allowMultiple ) {
 780                         return array();
 781                 }
 782
 783                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 784                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 785                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 786                         self::LIMIT_SML2 : self::LIMIT_SML1;
 787
 788                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 789                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 790                 }
 791
 792                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 793                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 794                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 795                 }
 796
 797                 if ( is_array( $allowedValues ) ) {
 798                         // Check for unknown values
 799                         $unknown = array_diff( $valuesList, $allowedValues );
 800                         if ( count( $unknown ) ) {
 801                                 if ( $allowMultiple ) {
 802                                         $s = count( $unknown ) > 1 ? 's' : '';
 803                                         $vals = implode( ", ", $unknown );
 804                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 805                                 } else {
 806                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 807                                 }
 808                         }
 809                         // Now throw them out
 810                         $valuesList = array_intersect( $valuesList, $allowedValues );
 811                 }
 812
 813                 return $allowMultiple ? $valuesList : $valuesList[0];
 814         }
 815
 816         /**
 817          * Validate the value against the minimum and user/bot maximum limits.
 818          * Prints usage info on failure.
 819          * @param $paramName string Parameter name
 820          * @param $value int Parameter value
 821          * @param $min int Minimum value
 822          * @param $max int Maximum value for users
 823          * @param $botMax int Maximum value for sysops/bots
 824          */
 825         function validateLimit( $paramName, &$value, $min, $max, $botMax = null ) {
 826                 if ( !is_null( $min ) && $value < $min ) {
 827                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)" );
 828                         $value = $min;
 829                 }
 830
 831                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 832                 if ( $this->getMain()->isInternalMode() ) {
 833                         return;
 834                 }
 835
 836                 // Optimization: do not check user's bot status unless really needed -- skips db query
 837                 // assumes $botMax >= $max
 838                 if ( !is_null( $max ) && $value > $max ) {
 839                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 840                                 if ( $value > $botMax ) {
 841                                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops" );
 842                                         $value = $botMax;
 843                                 }
 844                         } else {
 845                                 $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users" );
 846                                 $value = $max;
 847                         }
 848                 }
 849         }
 850
 851         /**
 852          * Truncate an array to a certain length.
 853          * @param $arr array Array to truncate
 854          * @param $limit int Maximum length
 855          * @return bool True if the array was truncated, false otherwise
 856          */
 857         public static function truncateArray( &$arr, $limit ) {
 858                 $modified = false;
 859                 while ( count( $arr ) > $limit ) {
 860                         array_pop( $arr );
 861                         $modified = true;
 862                 }
 863                 return $modified;
 864         }
 865
 866         /**
 867          * Throw a UsageException, which will (if uncaught) call the main module's
 868          * error handler and die with an error message.
 869          *
 870          * @param $description string One-line human-readable description of the
 871          *   error condition, e.g., "The API requires a valid action parameter"
 872          * @param $errorCode string Brief, arbitrary, stable string to allow easy
 873          *   automated identification of the error, e.g., 'unknown_action'
 874          * @param $httpRespCode int HTTP response code
 875          * @param $extradata array Data to add to the <error> element; array in ApiResult format
 876          */
 877         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
 878                 wfProfileClose();
 879                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
 880         }
 881
 882         /**
 883          * Array that maps message keys to error messages. $1 and friends are replaced.
 884          */
 885         public static $messageMap = array(
 886                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 887                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
 888                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
 889
 890                 // Messages from Title::getUserPermissionsErrors()
 891                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
 892                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
 893                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
 894                 'customcssjsprotected' => array( 'code' => 'customcssjsprotected', 'info' => "You're not allowed to edit custom CSS and JavaScript pages" ),
 895                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
 896                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
 897                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
 898                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
 899                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
 900                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
 901                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
 902                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
 903                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
 904                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
 905                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
 906                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
 907                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
 908
 909                 // Miscellaneous interface messages
 910                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
 911                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
 912                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
 913                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
 914                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
 915                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
 916                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
 917                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
 918                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
 919                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
 920                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
 921                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
 922                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
 923                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
 924                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
 925                 // 'badarticleerror' => shouldn't happen
 926                 // 'badtitletext' => shouldn't happen
 927                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
 928                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
 929                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
 930                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
 931                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
 932                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
 933                 'ipb_blocked_as_range' => array( 'code' => 'blockedasrange', 'info' => "IP address ``\$1'' was blocked as part of range ``\$2''. You can't unblock the IP invidually, but you can unblock the range as a whole." ),
 934                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
 935                 'mailnologin' => array( 'code' => 'cantsend', 'info' => "You are not logged in, you do not have a confirmed e-mail address, or you are not allowed to send e-mail to other users, so you cannot send e-mail" ),
 936                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
 937                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
 938                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
 939                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
 940                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
 941                 'noemail' => array( 'code' => 'noemail', 'info' => "The user has not specified a valid e-mail address, or has chosen not to receive e-mail from other users" ),
 942                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
 943                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
 944                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
 945                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
 946                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
 947                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
 948                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 949                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 950                 'summaryrequired' => array( 'code' => 'summaryrequired', 'info' => 'Summary required' ),
 951
 952                 // API-specific messages
 953                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
 954                 'writedisabled' => array( 'code' => 'noapiwrite', 'info' => "Editing of this wiki through the API is disabled. Make sure the \$wgEnableWriteAPI=true; statement is included in the wiki's LocalSettings.php file" ),
 955                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
 956                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
 957                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
 958                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
 959                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
 960                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
 961                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 962                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
 963                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
 964                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
 965                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
 966                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
 967                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
 968                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
 969                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
 970                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
 971                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
 972                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
 973                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
 974                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
 975                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
 976                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
 977                 'cantpurge' => array( 'code' => 'cantpurge', 'info' => "Only users with the 'purge' right can purge pages via the API" ),
 978                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
 979                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
 980                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
 981                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
 982                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
 983                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
 984                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
 985                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
 986                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
 987                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
 988                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
 989                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 990                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 991                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
 992                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
 993                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
 994                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
 995                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
 996
 997                 // ApiEditPage messages
 998                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
 999                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
1000                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
1001                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
1002                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
1003                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
1004                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
1005                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
1006                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
1007                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
1008                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
1009                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
1010                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
1011                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
1012                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
1013
1014                 // uploadMsgs
1015                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
1016                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
1017                 'uploaddisabled' => array( 'code' => 'uploaddisabled', 'info' => 'Uploads are not enabled.  Make sure $wgEnableUploads is set to true in LocalSettings.php and the PHP ini setting file_uploads is true' ),
1018                 'copyuploaddisabled' => array( 'code' => 'copyuploaddisabled', 'info' => 'Uploads by URL is not enabled.  Make sure $wgAllowCopyUploads is set to true in LocalSettings.php.' ),
1019         );
1020
1021         /**
1022          * Helper function for readonly errors
1023          */
1024         public function dieReadOnly() {
1025                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
1026                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
1027                         array( 'readonlyreason' => wfReadOnlyReason() ) );
1028         }
1029
1030         /**
1031          * Output the error message related to a certain array
1032          * @param $error array Element of a getUserPermissionsErrors()-style array
1033          */
1034         public function dieUsageMsg( $error ) {
1035                 $parsed = $this->parseMsg( $error );
1036                 $this->dieUsage( $parsed['info'], $parsed['code'] );
1037         }
1038
1039         /**
1040          * Return the error message related to a certain array
1041          * @param $error array Element of a getUserPermissionsErrors()-style array
1042          * @return array('code' => code, 'info' => info)
1043          */
1044         public function parseMsg( $error ) {
1045                 $key = array_shift( $error );
1046                 if ( isset( self::$messageMap[$key] ) ) {
1047                         return array( 'code' =>
1048                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
1049                                         'info' =>
1050                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
1051                         );
1052                 }
1053                 // If the key isn't present, throw an "unknown error"
1054                 return $this->parseMsg( array( 'unknownerror', $key ) );
1055         }
1056
1057         /**
1058          * Internal code errors should be reported with this method
1059          * @param $method string Method or function name
1060          * @param $message string Error message
1061          */
1062         protected static function dieDebug( $method, $message ) {
1063                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1064         }
1065
1066         /**
1067          * Indicates if this module needs maxlag to be checked
1068          * @return bool
1069          */
1070         public function shouldCheckMaxlag() {
1071                 return true;
1072         }
1073
1074         /**
1075          * Indicates whether this module requires read rights
1076          * @return bool
1077          */
1078         public function isReadMode() {
1079                 return true;
1080         }
1081         /**
1082          * Indicates whether this module requires write mode
1083          * @return bool
1084          */
1085         public function isWriteMode() {
1086                 return false;
1087         }
1088
1089         /**
1090          * Indicates whether this module must be called with a POST request
1091          * @return bool
1092          */
1093         public function mustBePosted() {
1094                 return false;
1095         }
1096
1097         /**
1098          * Returns the token salt if there is one, '' if the module doesn't require a salt, else false if the module doesn't need a token
1099          * @returns bool
1100          */
1101         public function getTokenSalt() {
1102                 return false;
1103         }
1104
1105         /**
1106         * Gets the user for whom to get the watchlist
1107         *
1108         * @returns User
1109         */
1110         public function getWatchlistUser( $params ) {
1111                 global $wgUser;
1112                 if ( !is_null( $params['owner'] ) && !is_null( $params['token'] ) ) {
1113                         $user = User::newFromName( $params['owner'], false );
1114                         if ( !$user->getId() ) {
1115                                 $this->dieUsage( 'Specified user does not exist', 'bad_wlowner' );
1116                         }
1117                         $token = $user->getOption( 'watchlisttoken' );
1118                         if ( $token == '' || $token != $params['token'] ) {
1119                                 $this->dieUsage( 'Incorrect watchlist token provided -- please set a correct token in Special:Preferences', 'bad_wltoken' );
1120                         }
1121                 } else {
1122                         if ( !$wgUser->isLoggedIn() ) {
1123                                 $this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
1124                         }
1125                         $user = $wgUser;
1126                 }
1127                 return $user;
1128         }
1129
1130         /**
1131          * Returns a list of all possible errors returned by the module
1132          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1133          */
1134         public function getPossibleErrors() {
1135                 $ret = array();
1136
1137                 $params = $this->getFinalParams();
1138                 if ( $params ) {
1139                         foreach ( $params as $paramName => $paramSettings ) {
1140                                 if ( isset( $paramSettings[ApiBase::PARAM_REQUIRED] ) ) {
1141                                         $ret[] = array( 'missingparam', $paramName );
1142                                 }
1143                         }
1144                 }
1145
1146                 if ( $this->mustBePosted() ) {
1147                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1148                 }
1149
1150                 if ( $this->isReadMode() ) {
1151                         $ret[] = array( 'readrequired' );
1152                 }
1153
1154                 if ( $this->isWriteMode() ) {
1155                         $ret[] = array( 'writerequired' );
1156                         $ret[] = array( 'writedisabled' );
1157                 }
1158
1159                 if ( $this->getTokenSalt() !== false ) {
1160                         $ret[] = array( 'missingparam', 'token' );
1161                         $ret[] = array( 'sessionfailure' );
1162                 }
1163
1164                 return $ret;
1165         }
1166
1167         /**
1168          * Parses a list of errors into a standardised format
1169          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1170          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1171          */
1172         public function parseErrors( $errors ) {
1173                 $ret = array();
1174
1175                 foreach ( $errors as $row ) {
1176                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1177                                 $ret[] = $row;
1178                         } else {
1179                                 $ret[] = $this->parseMsg( $row );
1180                         }
1181                 }
1182                 return $ret;
1183         }
1184
1185         /**
1186          * Profiling: total module execution time
1187          */
1188         private $mTimeIn = 0, $mModuleTime = 0;
1189
1190         /**
1191          * Start module profiling
1192          */
1193         public function profileIn() {
1194                 if ( $this->mTimeIn !== 0 ) {
1195                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1196                 }
1197                 $this->mTimeIn = microtime( true );
1198                 wfProfileIn( $this->getModuleProfileName() );
1199         }
1200
1201         /**
1202          * End module profiling
1203          */
1204         public function profileOut() {
1205                 if ( $this->mTimeIn === 0 ) {
1206                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1207                 }
1208                 if ( $this->mDBTimeIn !== 0 ) {
1209                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1210                 }
1211
1212                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1213                 $this->mTimeIn = 0;
1214                 wfProfileOut( $this->getModuleProfileName() );
1215         }
1216
1217         /**
1218          * When modules crash, sometimes it is needed to do a profileOut() regardless
1219          * of the profiling state the module was in. This method does such cleanup.
1220          */
1221         public function safeProfileOut() {
1222                 if ( $this->mTimeIn !== 0 ) {
1223                         if ( $this->mDBTimeIn !== 0 ) {
1224                                 $this->profileDBOut();
1225                         }
1226                         $this->profileOut();
1227                 }
1228         }
1229
1230         /**
1231          * Total time the module was executed
1232          * @return float
1233          */
1234         public function getProfileTime() {
1235                 if ( $this->mTimeIn !== 0 ) {
1236                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1237                 }
1238                 return $this->mModuleTime;
1239         }
1240
1241         /**
1242          * Profiling: database execution time
1243          */
1244         private $mDBTimeIn = 0, $mDBTime = 0;
1245
1246         /**
1247          * Start module profiling
1248          */
1249         public function profileDBIn() {
1250                 if ( $this->mTimeIn === 0 ) {
1251                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1252                 }
1253                 if ( $this->mDBTimeIn !== 0 ) {
1254                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1255                 }
1256                 $this->mDBTimeIn = microtime( true );
1257                 wfProfileIn( $this->getModuleProfileName( true ) );
1258         }
1259
1260         /**
1261          * End database profiling
1262          */
1263         public function profileDBOut() {
1264                 if ( $this->mTimeIn === 0 ) {
1265                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1266                 }
1267                 if ( $this->mDBTimeIn === 0 ) {
1268                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1269                 }
1270
1271                 $time = microtime( true ) - $this->mDBTimeIn;
1272                 $this->mDBTimeIn = 0;
1273
1274                 $this->mDBTime += $time;
1275                 $this->getMain()->mDBTime += $time;
1276                 wfProfileOut( $this->getModuleProfileName( true ) );
1277         }
1278
1279         /**
1280          * Total time the module used the database
1281          * @return float
1282          */
1283         public function getProfileDBTime() {
1284                 if ( $this->mDBTimeIn !== 0 ) {
1285                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1286                 }
1287                 return $this->mDBTime;
1288         }
1289
1290         /**
1291          * Debugging function that prints a value and an optional backtrace
1292          * @param $value mixed Value to print
1293          * @param $name string Description of the printed value
1294          * @param $backtrace bool If true, print a backtrace
1295          */
1296         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1297                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1298                 var_export( $value );
1299                 if ( $backtrace ) {
1300                         print "\n" . wfBacktrace();
1301                 }
1302                 print "\n</pre>\n";
1303         }
1304
1305         /**
1306          * Returns a string that identifies the version of this class.
1307          * @return string
1308          */
1309         public static function getBaseVersion() {
1310                 return __CLASS__ . ': $Id$';
1311         }
1312 }