includes/api/ApiBase.php

   1 <?php
   2
   3 /**
   4  * Created on Sep 5, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright © 2006, 2010 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 /**
  27  * This abstract class implements many basic API functions, and is the base of
  28  * all API classes.
  29  * The class functions are divided into several areas of functionality:
  30  *
  31  * Module parameters: Derived classes can define getAllowedParams() to specify
  32  *      which parameters to expect,h ow to parse and validate them.
  33  *
  34  * Profiling: various methods to allow keeping tabs on various tasks and their
  35  *      time costs
  36  *
  37  * Self-documentation: code to allow the API to document its own state
  38  *
  39  * @ingroup API
  40  */
  41 abstract class ApiBase {
  42
  43         // These constants allow modules to specify exactly how to treat incoming parameters.
  44
  45         const PARAM_DFLT = 0; // Default value of the parameter
  46         const PARAM_ISMULTI = 1; // Boolean, do we accept more than one item for this parameter (e.g.: titles)?
  47         const PARAM_TYPE = 2; // Can be either a string type (e.g.: 'integer') or an array of allowed values
  48         const PARAM_MAX = 3; // Max value allowed for a parameter. Only applies if TYPE='integer'
  49         const PARAM_MAX2 = 4; // Max value allowed for a parameter for bots and sysops. Only applies if TYPE='integer'
  50         const PARAM_MIN = 5; // Lowest value allowed for a parameter. Only applies if TYPE='integer'
  51         const PARAM_ALLOW_DUPLICATES = 6; // Boolean, do we allow the same value to be set more than once when ISMULTI=true
  52         const PARAM_DEPRECATED = 7; // Boolean, is the parameter deprecated (will show a warning)
  53
  54         const LIMIT_BIG1 = 500; // Fast query, std user limit
  55         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  56         const LIMIT_SML1 = 50; // Slow query, std user limit
  57         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  58
  59         private $mMainModule, $mModuleName, $mModulePrefix;
  60
  61         /**
  62          * Constructor
  63          * @param $mainModule ApiMain object
  64          * @param $moduleName string Name of this module
  65          * @param $modulePrefix string Prefix to use for parameter names
  66          */
  67         public function __construct( $mainModule, $moduleName, $modulePrefix = '' ) {
  68                 $this->mMainModule = $mainModule;
  69                 $this->mModuleName = $moduleName;
  70                 $this->mModulePrefix = $modulePrefix;
  71         }
  72
  73         /*****************************************************************************
  74          * ABSTRACT METHODS                                                          *
  75          *****************************************************************************/
  76
  77         /**
  78          * Evaluates the parameters, performs the requested query, and sets up
  79          * the result. Concrete implementations of ApiBase must override this
  80          * method to provide whatever functionality their module offers.
  81          * Implementations must not produce any output on their own and are not
  82          * expected to handle any errors.
  83          *
  84          * The execute() method will be invoked directly by ApiMain immediately
  85          * before the result of the module is output. Aside from the
  86          * constructor, implementations should assume that no other methods
  87          * will be called externally on the module before the result is
  88          * processed.
  89          *
  90          * The result data should be stored in the ApiResult object available
  91          * through getResult().
  92          */
  93         public abstract function execute();
  94
  95         /**
  96          * Returns a string that identifies the version of the extending class.
  97          * Typically includes the class name, the svn revision, timestamp, and
  98          * last author. Usually done with SVN's Id keyword
  99          * @return string
 100          */
 101         public abstract function getVersion();
 102
 103         /**
 104          * Get the name of the module being executed by this instance
 105          * @return string
 106          */
 107         public function getModuleName() {
 108                 return $this->mModuleName;
 109         }
 110
 111         /**
 112          * Get parameter prefix (usually two letters or an empty string).
 113          * @return string
 114          */
 115         public function getModulePrefix() {
 116                 return $this->mModulePrefix;
 117         }
 118
 119         /**
 120          * Get the name of the module as shown in the profiler log
 121          * @return string
 122          */
 123         public function getModuleProfileName( $db = false ) {
 124                 if ( $db ) {
 125                         return 'API:' . $this->mModuleName . '-DB';
 126                 } else {
 127                         return 'API:' . $this->mModuleName;
 128                 }
 129         }
 130
 131         /**
 132          * Get the main module
 133          * @return ApiMain object
 134          */
 135         public function getMain() {
 136                 return $this->mMainModule;
 137         }
 138
 139         /**
 140          * Returns true if this module is the main module ($this === $this->mMainModule),
 141          * false otherwise.
 142          * @return bool
 143          */
 144         public function isMain() {
 145                 return $this === $this->mMainModule;
 146         }
 147
 148         /**
 149          * Get the result object
 150          * @return ApiResult
 151          */
 152         public function getResult() {
 153                 // Main module has getResult() method overriden
 154                 // Safety - avoid infinite loop:
 155                 if ( $this->isMain() ) {
 156                         ApiBase::dieDebug( __METHOD__, 'base method was called on main module. ' );
 157                 }
 158                 return $this->getMain()->getResult();
 159         }
 160
 161         /**
 162          * Get the result data array (read-only)
 163          * @return array
 164          */
 165         public function getResultData() {
 166                 return $this->getResult()->getData();
 167         }
 168
 169         /**
 170          * Set warning section for this module. Users should monitor this
 171          * section to notice any changes in API. Multiple calls to this
 172          * function will result in the warning messages being separated by
 173          * newlines
 174          * @param $warning string Warning message
 175          */
 176         public function setWarning( $warning ) {
 177                 $data = $this->getResult()->getData();
 178                 if ( isset( $data['warnings'][$this->getModuleName()] ) ) {
 179                         // Don't add duplicate warnings
 180                         $warn_regex = preg_quote( $warning, '/' );
 181                         if ( preg_match( "/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*'] ) )
 182                         {
 183                                 return;
 184                         }
 185                         $oldwarning = $data['warnings'][$this->getModuleName()]['*'];
 186                         // If there is a warning already, append it to the existing one
 187                         $warning = "$oldwarning\n$warning";
 188                         $this->getResult()->unsetValue( 'warnings', $this->getModuleName() );
 189                 }
 190                 $msg = array();
 191                 ApiResult::setContent( $msg, $warning );
 192                 $this->getResult()->disableSizeCheck();
 193                 $this->getResult()->addValue( 'warnings', $this->getModuleName(), $msg );
 194                 $this->getResult()->enableSizeCheck();
 195         }
 196
 197         /**
 198          * If the module may only be used with a certain format module,
 199          * it should override this method to return an instance of that formatter.
 200          * A value of null means the default format will be used.
 201          * @return mixed instance of a derived class of ApiFormatBase, or null
 202          */
 203         public function getCustomPrinter() {
 204                 return null;
 205         }
 206
 207         /**
 208          * Generates help message for this module, or false if there is no description
 209          * @return mixed string or false
 210          */
 211         public function makeHelpMsg() {
 212                 static $lnPrfx = "\n  ";
 213
 214                 $msg = $this->getDescription();
 215
 216                 if ( $msg !== false ) {
 217
 218                         if ( !is_array( $msg ) ) {
 219                                 $msg = array(
 220                                         $msg
 221                                 );
 222                         }
 223                         $msg = $lnPrfx . implode( $lnPrfx, $msg ) . "\n";
 224
 225                         if ( $this->isReadMode() ) {
 226                                 $msg .= "\nThis module requires read rights.";
 227                         }
 228                         if ( $this->isWriteMode() ) {
 229                                 $msg .= "\nThis module requires write rights.";
 230                         }
 231                         if ( $this->mustBePosted() ) {
 232                                 $msg .= "\nThis module only accepts POST requests.";
 233                         }
 234                         if ( $this->isReadMode() || $this->isWriteMode() ||
 235                                         $this->mustBePosted() )
 236                         {
 237                                 $msg .= "\n";
 238                         }
 239
 240                         // Parameters
 241                         $paramsMsg = $this->makeHelpMsgParameters();
 242                         if ( $paramsMsg !== false ) {
 243                                 $msg .= "Parameters:\n$paramsMsg";
 244                         }
 245
 246                         // Examples
 247                         $examples = $this->getExamples();
 248                         if ( $examples !== false ) {
 249                                 if ( !is_array( $examples ) ) {
 250                                         $examples = array(
 251                                                 $examples
 252                                         );
 253                                 }
 254                                 $msg .= 'Example' . ( count( $examples ) > 1 ? 's' : '' ) . ":\n  ";
 255                                 $msg .= implode( $lnPrfx, $examples ) . "\n";
 256                         }
 257
 258                         if ( $this->getMain()->getShowVersions() ) {
 259                                 $versions = $this->getVersion();
 260                                 $pattern = '/(\$.*) ([0-9a-z_]+\.php) (.*\$)/i';
 261                                 $callback = array( $this, 'makeHelpMsg_callback' );
 262
 263                                 if ( is_array( $versions ) ) {
 264                                         foreach ( $versions as &$v ) {
 265                                                 $v = preg_replace_callback( $pattern, $callback, $v );
 266                                         }
 267                                         $versions = implode( "\n  ", $versions );
 268                                 } else {
 269                                         $versions = preg_replace_callback( $pattern, $callback, $versions );
 270                                 }
 271
 272                                 $msg .= "Version:\n  $versions\n";
 273                         }
 274                 }
 275
 276                 return $msg;
 277         }
 278
 279         /**
 280          * Generates the parameter descriptions for this module, to be displayed in the
 281          * module's help.
 282          * @return string
 283          */
 284         public function makeHelpMsgParameters() {
 285                 $params = $this->getFinalParams();
 286                 if ( $params ) {
 287
 288                         $paramsDescription = $this->getFinalParamDescription();
 289                         $msg = '';
 290                         $paramPrefix = "\n" . str_repeat( ' ', 19 );
 291                         foreach ( $params as $paramName => $paramSettings ) {
 292                                 $desc = isset( $paramsDescription[$paramName] ) ? $paramsDescription[$paramName] : '';
 293                                 if ( is_array( $desc ) ) {
 294                                         $desc = implode( $paramPrefix, $desc );
 295                                 }
 296
 297                                 $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ?
 298                                         $paramSettings[self::PARAM_DEPRECATED] : false;
 299                                 if ( $deprecated ) {
 300                                         $desc = "DEPRECATED! $desc";
 301                                 }
 302
 303                                 $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 304                                 if ( isset( $type ) ) {
 305                                         if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 306                                                 $prompt = 'Values (separate with \'|\'): ';
 307                                         } else {
 308                                                 $prompt = 'One value: ';
 309                                         }
 310
 311                                         if ( is_array( $type ) ) {
 312                                                 $choices = array();
 313                                                 $nothingPrompt = false;
 314                                                 foreach ( $type as $t )
 315                                                         if ( $t === '' ) {
 316                                                                 $nothingPrompt = 'Can be empty, or ';
 317                                                         } else {
 318                                                                 $choices[] =  $t;
 319                                                         }
 320                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt . implode( ', ', $choices );
 321                                         } else {
 322                                                 switch ( $type ) {
 323                                                         case 'namespace':
 324                                                                 // Special handling because namespaces are type-limited, yet they are not given
 325                                                                 $desc .= $paramPrefix . $prompt . implode( ', ', ApiBase::getValidNamespaces() );
 326                                                                 break;
 327                                                         case 'limit':
 328                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]} ({$paramSettings[self::PARAM_MAX2]} for bots) allowed.";
 329                                                                 break;
 330                                                         case 'integer':
 331                                                                 $hasMin = isset( $paramSettings[self::PARAM_MIN] );
 332                                                                 $hasMax = isset( $paramSettings[self::PARAM_MAX] );
 333                                                                 if ( $hasMin || $hasMax ) {
 334                                                                         if ( !$hasMax ) {
 335                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self::PARAM_MIN]}";
 336                                                                         } elseif ( !$hasMin ) {
 337                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self::PARAM_MAX]}";
 338                                                                         } else {
 339                                                                                 $intRangeStr = "The value must be between {$paramSettings[self::PARAM_MIN]} and {$paramSettings[self::PARAM_MAX]}";
 340                                                                         }
 341
 342                                                                         $desc .= $paramPrefix . $intRangeStr;
 343                                                                 }
 344                                                                 break;
 345                                                 }
 346                                         }
 347                                 }
 348
 349                                 $default = is_array( $paramSettings ) ? ( isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null ) : $paramSettings;
 350                                 if ( !is_null( $default ) && $default !== false ) {
 351                                         $desc .= $paramPrefix . "Default: $default";
 352                                 }
 353
 354                                 $msg .= sprintf( "  %-14s - %s\n", $this->encodeParamName( $paramName ), $desc );
 355                         }
 356                         return $msg;
 357
 358                 } else {
 359                         return false;
 360                 }
 361         }
 362
 363         /**
 364          * Callback for preg_replace_callback() call in makeHelpMsg().
 365          * Replaces a source file name with a link to ViewVC
 366          */
 367         public function makeHelpMsg_callback( $matches ) {
 368                 global $wgAutoloadClasses, $wgAutoloadLocalClasses;
 369                 if ( isset( $wgAutoloadLocalClasses[get_class( $this )] ) ) {
 370                         $file = $wgAutoloadLocalClasses[get_class( $this )];
 371                 } elseif ( isset( $wgAutoloadClasses[get_class( $this )] ) ) {
 372                         $file = $wgAutoloadClasses[get_class( $this )];
 373                 }
 374
 375                 // Do some guesswork here
 376                 $path = strstr( $file, 'includes/api/' );
 377                 if ( $path === false ) {
 378                         $path = strstr( $file, 'extensions/' );
 379                 } else {
 380                         $path = 'phase3/' . $path;
 381                 }
 382
 383                 // Get the filename from $matches[2] instead of $file
 384                 // If they're not the same file, they're assumed to be in the
 385                 // same directory
 386                 // This is necessary to make stuff like ApiMain::getVersion()
 387                 // returning the version string for ApiBase work
 388                 if ( $path ) {
 389                         return "{$matches[0]}\n   http://svn.wikimedia.org/" .
 390                                 "viewvc/mediawiki/trunk/" . dirname( $path ) .
 391                                 "/{$matches[2]}";
 392                 }
 393                 return $matches[0];
 394         }
 395
 396         /**
 397          * Returns the description string for this module
 398          * @return mixed string or array of strings
 399          */
 400         protected function getDescription() {
 401                 return false;
 402         }
 403
 404         /**
 405          * Returns usage examples for this module. Return null if no examples are available.
 406          * @return mixed string or array of strings
 407          */
 408         protected function getExamples() {
 409                 return false;
 410         }
 411
 412         /**
 413          * Returns an array of allowed parameters (parameter name) => (default
 414          * value) or (parameter name) => (array with PARAM_* constants as keys)
 415          * Don't call this function directly: use getFinalParams() to allow
 416          * hooks to modify parameters as needed.
 417          * @return array
 418          */
 419         protected function getAllowedParams() {
 420                 return false;
 421         }
 422
 423         /**
 424          * Returns an array of parameter descriptions.
 425          * Don't call this functon directly: use getFinalParamDescription() to
 426          * allow hooks to modify descriptions as needed.
 427          * @return array
 428          */
 429         protected function getParamDescription() {
 430                 return false;
 431         }
 432
 433         /**
 434          * Get final list of parameters, after hooks have had a chance to
 435          * tweak it as needed.
 436          * @return array
 437          */
 438         public function getFinalParams() {
 439                 $params = $this->getAllowedParams();
 440                 wfRunHooks( 'APIGetAllowedParams', array( &$this, &$params ) );
 441                 return $params;
 442         }
 443
 444         /**
 445          * Get final description, after hooks have had a chance to tweak it as
 446          * needed.
 447          * @return array
 448          */
 449         public function getFinalParamDescription() {
 450                 $desc = $this->getParamDescription();
 451                 wfRunHooks( 'APIGetParamDescription', array( &$this, &$desc ) );
 452                 return $desc;
 453         }
 454
 455         /**
 456          * This method mangles parameter name based on the prefix supplied to the constructor.
 457          * Override this method to change parameter name during runtime
 458          * @param $paramName string Parameter name
 459          * @return string Prefixed parameter name
 460          */
 461         public function encodeParamName( $paramName ) {
 462                 return $this->mModulePrefix . $paramName;
 463         }
 464
 465         /**
 466          * Using getAllowedParams(), this function makes an array of the values
 467          * provided by the user, with key being the name of the variable, and
 468          * value - validated value from user or default. limits will not be
 469          * parsed if $parseLimit is set to false; use this when the max
 470          * limit is not definitive yet, e.g. when getting revisions.
 471          * @param $parseLimit Boolean: true by default
 472          * @return array
 473          */
 474         public function extractRequestParams( $parseLimit = true ) {
 475                 $params = $this->getFinalParams();
 476                 $results = array();
 477
 478                 if( $params ) { // getFinalParams() can return false
 479                         foreach ( $params as $paramName => $paramSettings ) {
 480                                 $results[$paramName] = $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 481                         }
 482                 }
 483
 484                 return $results;
 485         }
 486
 487         /**
 488          * Get a value for the given parameter
 489          * @param $paramName string Parameter name
 490          * @param $parseLimit bool see extractRequestParams()
 491          * @return mixed Parameter value
 492          */
 493         protected function getParameter( $paramName, $parseLimit = true ) {
 494                 $params = $this->getFinalParams();
 495                 $paramSettings = $params[$paramName];
 496                 return $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 497         }
 498
 499         /**
 500          * Die if none or more than one of a certain set of parameters is set and not false.
 501          * @param $params array of parameter names
 502          */
 503         public function requireOnlyOneParameter( $params ) {
 504                 $required = func_get_args();
 505                 array_shift( $required );
 506
 507                 $intersection = array_intersect( array_keys( array_filter( $params,
 508                                 create_function( '$x', 'return !is_null($x) && $x !== false;' )
 509                         ) ), $required );
 510                 if ( count( $intersection ) > 1 ) {
 511                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 512                 } elseif ( count( $intersection ) == 0 ) {
 513                         $this->dieUsage( 'One of the parameters ' . implode( ', ', $required ) . ' is required', 'missingparam' );
 514                 }
 515         }
 516
 517         /**
 518          * Returns an array of the namespaces (by integer id) that exist on the
 519          * wiki. Used primarily in help documentation.
 520          * @return array
 521          */
 522         public static function getValidNamespaces() {
 523                 static $mValidNamespaces = null;
 524
 525                 if ( is_null( $mValidNamespaces ) ) {
 526                         global $wgCanonicalNamespaceNames;
 527                         $mValidNamespaces = array( NS_MAIN ); // Doesn't appear in $wgCanonicalNamespaceNames for some reason
 528                         foreach ( array_keys( $wgCanonicalNamespaceNames ) as $ns ) {
 529                                 if ( $ns > 0 ) {
 530                                         $mValidNamespaces[] = $ns;
 531                                 }
 532                         }
 533                 }
 534
 535                 return $mValidNamespaces;
 536         }
 537
 538         /**
 539         * Handle watchlist settings
 540         */
 541         protected function getWatchlistValue ( $watchlist, $titleObj = null ) {
 542                 switch ( $watchlist ) {
 543                         case 'watch':
 544                                 return true;
 545                         case 'unwatch':
 546                                 return false;
 547                         case 'preferences':
 548                                 global $wgUser;
 549                                 if ( isset($titleObj)
 550                                          && $titleObj->exists()
 551                                          && $wgUser->getOption( 'watchdefault' )
 552                                          && !$titleObj->userIsWatching() ) {
 553                                         return true;
 554                                 }
 555                                 return null;
 556                         case 'nochange':
 557                         default:
 558                                 return null;
 559                 }
 560         }
 561
 562         /**
 563          * Using the settings determine the value for the given parameter
 564          *
 565          * @param $paramName String: parameter name
 566          * @param $paramSettings Mixed: default value or an array of settings
 567          *  using PARAM_* constants.
 568          * @param $parseLimit Boolean: parse limit?
 569          * @return mixed Parameter value
 570          */
 571         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 572                 // Some classes may decide to change parameter names
 573                 $encParamName = $this->encodeParamName( $paramName );
 574
 575                 if ( !is_array( $paramSettings ) ) {
 576                         $default = $paramSettings;
 577                         $multi = false;
 578                         $type = gettype( $paramSettings );
 579                         $dupes = false;
 580                         $deprecated = false;
 581                 } else {
 582                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 583                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 584                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 585                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 586                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 587
 588                         // When type is not given, and no choices, the type is the same as $default
 589                         if ( !isset( $type ) ) {
 590                                 if ( isset( $default ) ) {
 591                                         $type = gettype( $default );
 592                                 } else {
 593                                         $type = 'NULL'; // allow everything
 594                                 }
 595                         }
 596                 }
 597
 598                 if ( $type == 'boolean' ) {
 599                         if ( isset( $default ) && $default !== false ) {
 600                                 // Having a default value of anything other than 'false' is pointless
 601                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 602                         }
 603
 604                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 605                 } else {
 606                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 607
 608                         if ( isset( $value ) && $type == 'namespace' ) {
 609                                 $type = ApiBase::getValidNamespaces();
 610                         }
 611                 }
 612
 613                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 614                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 615                 }
 616
 617                 // More validation only when choices were not given
 618                 // choices were validated in parseMultiValue()
 619                 if ( isset( $value ) ) {
 620                         if ( !is_array( $type ) ) {
 621                                 switch ( $type ) {
 622                                         case 'NULL': // nothing to do
 623                                                 break;
 624                                         case 'string': // nothing to do
 625                                                 break;
 626                                         case 'integer': // Force everything using intval() and optionally validate limits
 627
 628                                                 $value = is_array( $value ) ? array_map( 'intval', $value ) : intval( $value );
 629                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 630                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 631
 632                                                 if ( !is_null( $min ) || !is_null( $max ) ) {
 633                                                         $values = is_array( $value ) ? $value : array( $value );
 634                                                         foreach ( $values as &$v ) {
 635                                                                 $this->validateLimit( $paramName, $v, $min, $max );
 636                                                         }
 637                                                 }
 638                                                 break;
 639                                         case 'limit':
 640                                                 if ( !$parseLimit ) {
 641                                                         // Don't do any validation whatsoever
 642                                                         break;
 643                                                 }
 644                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 645                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 646                                                 }
 647                                                 if ( $multi ) {
 648                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 649                                                 }
 650                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 651                                                 if ( $value == 'max' ) {
 652                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 653                                                         $this->getResult()->addValue( 'limits', $this->getModuleName(), $value );
 654                                                 } else {
 655                                                         $value = intval( $value );
 656                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 657                                                 }
 658                                                 break;
 659                                         case 'boolean':
 660                                                 if ( $multi )
 661                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 662                                                 break;
 663                                         case 'timestamp':
 664                                                 if ( $multi ) {
 665                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 666                                                 }
 667                                                 $value = wfTimestamp( TS_UNIX, $value );
 668                                                 if ( $value === 0 ) {
 669                                                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}" );
 670                                                 }
 671                                                 $value = wfTimestamp( TS_MW, $value );
 672                                                 break;
 673                                         case 'user':
 674                                                 if( !is_array( $value ) ) $value = array( $value );
 675
 676                                                 foreach( $value as $key => $val ) {
 677                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 678                                                         if ( is_null( $title ) ) {
 679                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 680                                                         }
 681                                                         $value[$key] = $title->getText();
 682                                                 }
 683
 684                                                 if( !$multi ) $value = $value[0];
 685
 686                                                 break;
 687                                         default:
 688                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 689                                 }
 690                         }
 691
 692                         // Throw out duplicates if requested
 693                         if ( is_array( $value ) && !$dupes ) {
 694                                 $value = array_unique( $value );
 695                         }
 696
 697                         // Set a warning if a deprecated parameter has been passed
 698                         if ( $deprecated && $value !== false ) {
 699                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 700                         }
 701                 }
 702
 703                 return $value;
 704         }
 705
 706         /**
 707          * Return an array of values that were given in a 'a|b|c' notation,
 708          * after it optionally validates them against the list allowed values.
 709          *
 710          * @param $valueName string The name of the parameter (for error
 711          *  reporting)
 712          * @param $value mixed The value being parsed
 713          * @param $allowMultiple bool Can $value contain more than one value
 714          *  separated by '|'?
 715          * @param $allowedValues mixed An array of values to check against. If
 716          *  null, all values are accepted.
 717          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 718          */
 719         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 720                 if ( trim( $value ) === '' && $allowMultiple ) {
 721                         return array();
 722                 }
 723
 724                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 725                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 726                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 727                         self::LIMIT_SML2 : self::LIMIT_SML1;
 728
 729                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 730                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 731                 }
 732
 733                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 734                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 735                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 736                 }
 737
 738                 if ( is_array( $allowedValues ) ) {
 739                         // Check for unknown values
 740                         $unknown = array_diff( $valuesList, $allowedValues );
 741                         if ( count( $unknown ) ) {
 742                                 if ( $allowMultiple ) {
 743                                         $s = count( $unknown ) > 1 ? 's' : '';
 744                                         $vals = implode( ", ", $unknown );
 745                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 746                                 } else {
 747                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 748                                 }
 749                         }
 750                         // Now throw them out
 751                         $valuesList = array_intersect( $valuesList, $allowedValues );
 752                 }
 753
 754                 return $allowMultiple ? $valuesList : $valuesList[0];
 755         }
 756
 757         /**
 758          * Validate the value against the minimum and user/bot maximum limits.
 759          * Prints usage info on failure.
 760          * @param $paramName string Parameter name
 761          * @param $value int Parameter value
 762          * @param $min int Minimum value
 763          * @param $max int Maximum value for users
 764          * @param $botMax int Maximum value for sysops/bots
 765          */
 766         function validateLimit( $paramName, &$value, $min, $max, $botMax = null ) {
 767                 if ( !is_null( $min ) && $value < $min ) {
 768                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)" );
 769                         $value = $min;
 770                 }
 771
 772                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 773                 if ( $this->getMain()->isInternalMode() ) {
 774                         return;
 775                 }
 776
 777                 // Optimization: do not check user's bot status unless really needed -- skips db query
 778                 // assumes $botMax >= $max
 779                 if ( !is_null( $max ) && $value > $max ) {
 780                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 781                                 if ( $value > $botMax ) {
 782                                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops" );
 783                                         $value = $botMax;
 784                                 }
 785                         } else {
 786                                 $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users" );
 787                                 $value = $max;
 788                         }
 789                 }
 790         }
 791
 792         /**
 793          * Truncate an array to a certain length.
 794          * @param $arr array Array to truncate
 795          * @param $limit int Maximum length
 796          * @return bool True if the array was truncated, false otherwise
 797          */
 798         public static function truncateArray( &$arr, $limit ) {
 799                 $modified = false;
 800                 while ( count( $arr ) > $limit ) {
 801                         $junk = array_pop( $arr );
 802                         $modified = true;
 803                 }
 804                 return $modified;
 805         }
 806
 807         /**
 808          * Throw a UsageException, which will (if uncaught) call the main module's
 809          * error handler and die with an error message.
 810          *
 811          * @param $description string One-line human-readable description of the
 812          *   error condition, e.g., "The API requires a valid action parameter"
 813          * @param $errorCode string Brief, arbitrary, stable string to allow easy
 814          *   automated identification of the error, e.g., 'unknown_action'
 815          * @param $httpRespCode int HTTP response code
 816          * @param $extradata array Data to add to the <error> element; array in ApiResult format
 817          */
 818         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
 819                 wfProfileClose();
 820                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
 821         }
 822
 823         /**
 824          * Array that maps message keys to error messages. $1 and friends are replaced.
 825          */
 826         public static $messageMap = array(
 827                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 828                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
 829                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
 830
 831                 // Messages from Title::getUserPermissionsErrors()
 832                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
 833                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
 834                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
 835                 'customcssjsprotected' => array( 'code' => 'customcssjsprotected', 'info' => "You're not allowed to edit custom CSS and JavaScript pages" ),
 836                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
 837                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
 838                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
 839                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
 840                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
 841                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
 842                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
 843                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
 844                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
 845                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
 846                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
 847                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
 848                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
 849
 850                 // Miscellaneous interface messages
 851                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
 852                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
 853                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
 854                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
 855                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
 856                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
 857                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
 858                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
 859                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
 860                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
 861                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
 862                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
 863                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
 864                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
 865                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
 866                 // 'badarticleerror' => shouldn't happen
 867                 // 'badtitletext' => shouldn't happen
 868                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
 869                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
 870                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
 871                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
 872                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
 873                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
 874                 '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." ),
 875                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
 876                 '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" ),
 877                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
 878                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
 879                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
 880                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
 881                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
 882                 '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" ),
 883                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
 884                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
 885                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
 886                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
 887                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
 888                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
 889                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 890                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 891
 892                 // API-specific messages
 893                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
 894                 '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" ),
 895                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
 896                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
 897                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
 898                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
 899                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
 900                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
 901                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 902                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
 903                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
 904                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
 905                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
 906                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
 907                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
 908                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
 909                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
 910                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
 911                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
 912                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
 913                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
 914                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
 915                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
 916                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
 917                 'cantpurge' => array( 'code' => 'cantpurge', 'info' => "Only users with the 'purge' right can purge pages via the API" ),
 918                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
 919                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
 920                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
 921                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
 922                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
 923                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
 924                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
 925                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
 926                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
 927                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
 928                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
 929                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 930                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 931                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
 932                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
 933                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
 934                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
 935                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
 936
 937                 // ApiEditPage messages
 938                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
 939                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
 940                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
 941                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
 942                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
 943                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
 944                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
 945                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
 946                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
 947                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
 948                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
 949                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
 950                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
 951                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
 952                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
 953
 954                 // uploadMsgs
 955                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
 956                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
 957                 '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' ),
 958         );
 959
 960         /**
 961          * Helper function for readonly errors
 962          */
 963         public function dieReadOnly() {
 964                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
 965                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
 966                         array( 'readonlyreason' => wfReadOnlyReason() ) );
 967         }
 968
 969         /**
 970          * Output the error message related to a certain array
 971          * @param $error array Element of a getUserPermissionsErrors()-style array
 972          */
 973         public function dieUsageMsg( $error ) {
 974                 $parsed = $this->parseMsg( $error );
 975                 $this->dieUsage( $parsed['info'], $parsed['code'] );
 976         }
 977
 978         /**
 979          * Return the error message related to a certain array
 980          * @param $error array Element of a getUserPermissionsErrors()-style array
 981          * @return array('code' => code, 'info' => info)
 982          */
 983         public function parseMsg( $error ) {
 984                 $key = array_shift( $error );
 985                 if ( isset( self::$messageMap[$key] ) ) {
 986                         return array( 'code' =>
 987                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
 988                                         'info' =>
 989                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
 990                         );
 991                 }
 992                 // If the key isn't present, throw an "unknown error"
 993                 return $this->parseMsg( array( 'unknownerror', $key ) );
 994         }
 995
 996         /**
 997          * Internal code errors should be reported with this method
 998          * @param $method string Method or function name
 999          * @param $message string Error message
1000          */
1001         protected static function dieDebug( $method, $message ) {
1002                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1003         }
1004
1005         /**
1006          * Indicates if this module needs maxlag to be checked
1007          * @return bool
1008          */
1009         public function shouldCheckMaxlag() {
1010                 return true;
1011         }
1012
1013         /**
1014          * Indicates whether this module requires read rights
1015          * @return bool
1016          */
1017         public function isReadMode() {
1018                 return true;
1019         }
1020         /**
1021          * Indicates whether this module requires write mode
1022          * @return bool
1023          */
1024         public function isWriteMode() {
1025                 return false;
1026         }
1027
1028         /**
1029          * Indicates whether this module must be called with a POST request
1030          * @return bool
1031          */
1032         public function mustBePosted() {
1033                 return false;
1034         }
1035
1036         /**
1037          * 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
1038          * @returns bool
1039          */
1040         public function getTokenSalt() {
1041                 return false;
1042         }
1043
1044         /**
1045          * Returns a list of all possible errors returned by the module
1046          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1047          */
1048         public function getPossibleErrors() {
1049                 $ret = array();
1050
1051                 if ( $this->mustBePosted() ) {
1052                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1053                 }
1054
1055                 if ( $this->isReadMode() ) {
1056                         $ret[] = array( 'readrequired' );
1057                 }
1058
1059                 if ( $this->isWriteMode() ) {
1060                         $ret[] = array( 'writerequired' );
1061                         $ret[] = array( 'writedisabled' );
1062                 }
1063
1064                 if ( $this->getTokenSalt() !== false ) {
1065                         $ret[] = array( 'missingparam', 'token' );
1066                         $ret[] = array( 'sessionfailure' );
1067                 }
1068
1069                 return $ret;
1070         }
1071
1072         /**
1073          * Parses a list of errors into a standardised format
1074          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1075          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1076          */
1077         public function parseErrors( $errors ) {
1078                 $ret = array();
1079
1080                 foreach ( $errors as $row ) {
1081                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1082                                 $ret[] = $row;
1083                         } else {
1084                                 $ret[] = $this->parseMsg( $row );
1085                         }
1086                 }
1087                 return $ret;
1088         }
1089
1090         /**
1091          * Profiling: total module execution time
1092          */
1093         private $mTimeIn = 0, $mModuleTime = 0;
1094
1095         /**
1096          * Start module profiling
1097          */
1098         public function profileIn() {
1099                 if ( $this->mTimeIn !== 0 ) {
1100                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1101                 }
1102                 $this->mTimeIn = microtime( true );
1103                 wfProfileIn( $this->getModuleProfileName() );
1104         }
1105
1106         /**
1107          * End module profiling
1108          */
1109         public function profileOut() {
1110                 if ( $this->mTimeIn === 0 ) {
1111                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1112                 }
1113                 if ( $this->mDBTimeIn !== 0 ) {
1114                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1115                 }
1116
1117                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1118                 $this->mTimeIn = 0;
1119                 wfProfileOut( $this->getModuleProfileName() );
1120         }
1121
1122         /**
1123          * When modules crash, sometimes it is needed to do a profileOut() regardless
1124          * of the profiling state the module was in. This method does such cleanup.
1125          */
1126         public function safeProfileOut() {
1127                 if ( $this->mTimeIn !== 0 ) {
1128                         if ( $this->mDBTimeIn !== 0 ) {
1129                                 $this->profileDBOut();
1130                         }
1131                         $this->profileOut();
1132                 }
1133         }
1134
1135         /**
1136          * Total time the module was executed
1137          * @return float
1138          */
1139         public function getProfileTime() {
1140                 if ( $this->mTimeIn !== 0 ) {
1141                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1142                 }
1143                 return $this->mModuleTime;
1144         }
1145
1146         /**
1147          * Profiling: database execution time
1148          */
1149         private $mDBTimeIn = 0, $mDBTime = 0;
1150
1151         /**
1152          * Start module profiling
1153          */
1154         public function profileDBIn() {
1155                 if ( $this->mTimeIn === 0 ) {
1156                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1157                 }
1158                 if ( $this->mDBTimeIn !== 0 ) {
1159                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1160                 }
1161                 $this->mDBTimeIn = microtime( true );
1162                 wfProfileIn( $this->getModuleProfileName( true ) );
1163         }
1164
1165         /**
1166          * End database profiling
1167          */
1168         public function profileDBOut() {
1169                 if ( $this->mTimeIn === 0 ) {
1170                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1171                 }
1172                 if ( $this->mDBTimeIn === 0 ) {
1173                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1174                 }
1175
1176                 $time = microtime( true ) - $this->mDBTimeIn;
1177                 $this->mDBTimeIn = 0;
1178
1179                 $this->mDBTime += $time;
1180                 $this->getMain()->mDBTime += $time;
1181                 wfProfileOut( $this->getModuleProfileName( true ) );
1182         }
1183
1184         /**
1185          * Total time the module used the database
1186          * @return float
1187          */
1188         public function getProfileDBTime() {
1189                 if ( $this->mDBTimeIn !== 0 ) {
1190                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1191                 }
1192                 return $this->mDBTime;
1193         }
1194
1195         /**
1196          * Debugging function that prints a value and an optional backtrace
1197          * @param $value mixed Value to print
1198          * @param $name string Description of the printed value
1199          * @param $backtrace bool If true, print a backtrace
1200          */
1201         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1202                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1203                 var_export( $value );
1204                 if ( $backtrace ) {
1205                         print "\n" . wfBacktrace();
1206                 }
1207                 print "\n</pre>\n";
1208         }
1209
1210         /**
1211          * Returns a string that identifies the version of this class.
1212          * @return string
1213          */
1214         public static function getBaseVersion() {
1215                 return __CLASS__ . ': $Id$';
1216         }
1217 }