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