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  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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         const PARAM_REQUIRED = 8; // Boolean, is the parameter required?
  54
  55         const LIMIT_BIG1 = 500; // Fast query, std user limit
  56         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  57         const LIMIT_SML1 = 50; // Slow query, std user limit
  58         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  59
  60         private $mMainModule, $mModuleName, $mModulePrefix;
  61         private $mParamCache = array();
  62
  63         /**
  64          * Constructor
  65          * @param $mainModule ApiMain object
  66          * @param $moduleName string Name of this module
  67          * @param $modulePrefix string Prefix to use for parameter names
  68          */
  69         public function __construct( $mainModule, $moduleName, $modulePrefix = '' ) {
  70                 $this->mMainModule = $mainModule;
  71                 $this->mModuleName = $moduleName;
  72                 $this->mModulePrefix = $modulePrefix;
  73         }
  74
  75         /*****************************************************************************
  76          * ABSTRACT METHODS                                                          *
  77          *****************************************************************************/
  78
  79         /**
  80          * Evaluates the parameters, performs the requested query, and sets up
  81          * the result. Concrete implementations of ApiBase must override this
  82          * method to provide whatever functionality their module offers.
  83          * Implementations must not produce any output on their own and are not
  84          * expected to handle any errors.
  85          *
  86          * The execute() method will be invoked directly by ApiMain immediately
  87          * before the result of the module is output. Aside from the
  88          * constructor, implementations should assume that no other methods
  89          * will be called externally on the module before the result is
  90          * processed.
  91          *
  92          * The result data should be stored in the ApiResult object available
  93          * through getResult().
  94          */
  95         public abstract function execute();
  96
  97         /**
  98          * Returns a string that identifies the version of the extending class.
  99          * Typically includes the class name, the svn revision, timestamp, and
 100          * last author. Usually done with SVN's Id keyword
 101          * @return string
 102          */
 103         public abstract function getVersion();
 104
 105         /**
 106          * Get the name of the module being executed by this instance
 107          * @return string
 108          */
 109         public function getModuleName() {
 110                 return $this->mModuleName;
 111         }
 112
 113         /**
 114          * Get parameter prefix (usually two letters or an empty string).
 115          * @return string
 116          */
 117         public function getModulePrefix() {
 118                 return $this->mModulePrefix;
 119         }
 120
 121         /**
 122          * Get the name of the module as shown in the profiler log
 123          * @return string
 124          */
 125         public function getModuleProfileName( $db = false ) {
 126                 if ( $db ) {
 127                         return 'API:' . $this->mModuleName . '-DB';
 128                 } else {
 129                         return 'API:' . $this->mModuleName;
 130                 }
 131         }
 132
 133         /**
 134          * Get the main module
 135          * @return ApiMain object
 136          */
 137         public function getMain() {
 138                 return $this->mMainModule;
 139         }
 140
 141         /**
 142          * Returns true if this module is the main module ($this === $this->mMainModule),
 143          * false otherwise.
 144          * @return bool
 145          */
 146         public function isMain() {
 147                 return $this === $this->mMainModule;
 148         }
 149
 150         /**
 151          * Get the result object
 152          * @return ApiResult
 153          */
 154         public function getResult() {
 155                 // Main module has getResult() method overriden
 156                 // Safety - avoid infinite loop:
 157                 if ( $this->isMain() ) {
 158                         ApiBase::dieDebug( __METHOD__, 'base method was called on main module. ' );
 159                 }
 160                 return $this->getMain()->getResult();
 161         }
 162
 163         /**
 164          * Get the result data array (read-only)
 165          * @return array
 166          */
 167         public function getResultData() {
 168                 return $this->getResult()->getData();
 169         }
 170
 171         /**
 172          * Set warning section for this module. Users should monitor this
 173          * section to notice any changes in API. Multiple calls to this
 174          * function will result in the warning messages being separated by
 175          * newlines
 176          * @param $warning string Warning message
 177          */
 178         public function setWarning( $warning ) {
 179                 $data = $this->getResult()->getData();
 180                 if ( isset( $data['warnings'][$this->getModuleName()] ) ) {
 181                         // Don't add duplicate warnings
 182                         $warn_regex = preg_quote( $warning, '/' );
 183                         if ( preg_match( "/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*'] ) )
 184                         {
 185                                 return;
 186                         }
 187                         $oldwarning = $data['warnings'][$this->getModuleName()]['*'];
 188                         // If there is a warning already, append it to the existing one
 189                         $warning = "$oldwarning\n$warning";
 190                         $this->getResult()->unsetValue( 'warnings', $this->getModuleName() );
 191                 }
 192                 $msg = array();
 193                 ApiResult::setContent( $msg, $warning );
 194                 $this->getResult()->disableSizeCheck();
 195                 $this->getResult()->addValue( 'warnings', $this->getModuleName(), $msg );
 196                 $this->getResult()->enableSizeCheck();
 197         }
 198
 199         /**
 200          * If the module may only be used with a certain format module,
 201          * it should override this method to return an instance of that formatter.
 202          * A value of null means the default format will be used.
 203          * @return mixed instance of a derived class of ApiFormatBase, or null
 204          */
 205         public function getCustomPrinter() {
 206                 return null;
 207         }
 208
 209         /**
 210          * Generates help message for this module, or false if there is no description
 211          * @return mixed string or false
 212          */
 213         public function makeHelpMsg() {
 214                 static $lnPrfx = "\n  ";
 215
 216                 $msg = $this->getDescription();
 217
 218                 if ( $msg !== false ) {
 219
 220                         if ( !is_array( $msg ) ) {
 221                                 $msg = array(
 222                                         $msg
 223                                 );
 224                         }
 225                         $msg = $lnPrfx . implode( $lnPrfx, $msg ) . "\n";
 226
 227                         if ( $this->isReadMode() ) {
 228                                 $msg .= "\nThis module requires read rights";
 229                         }
 230                         if ( $this->isWriteMode() ) {
 231                                 $msg .= "\nThis module requires write rights";
 232                         }
 233                         if ( $this->mustBePosted() ) {
 234                                 $msg .= "\nThis module only accepts POST requests";
 235                         }
 236                         if ( $this->isReadMode() || $this->isWriteMode() ||
 237                                         $this->mustBePosted() )
 238                         {
 239                                 $msg .= "\n";
 240                         }
 241
 242                         // Parameters
 243                         $paramsMsg = $this->makeHelpMsgParameters();
 244                         if ( $paramsMsg !== false ) {
 245                                 $msg .= "Parameters:\n$paramsMsg";
 246                         }
 247
 248                         // Examples
 249                         $examples = $this->getExamples();
 250                         if ( $examples !== false ) {
 251                                 if ( !is_array( $examples ) ) {
 252                                         $examples = array(
 253                                                 $examples
 254                                         );
 255                                 }
 256                                 $msg .= 'Example' . ( count( $examples ) > 1 ? 's' : '' ) . ":\n  ";
 257                                 $msg .= implode( $lnPrfx, $examples ) . "\n";
 258                         }
 259
 260                         if ( $this->getMain()->getShowVersions() ) {
 261                                 $versions = $this->getVersion();
 262                                 $pattern = '/(\$.*) ([0-9a-z_]+\.php) (.*\$)/i';
 263                                 $callback = array( $this, 'makeHelpMsg_callback' );
 264
 265                                 if ( is_array( $versions ) ) {
 266                                         foreach ( $versions as &$v ) {
 267                                                 $v = preg_replace_callback( $pattern, $callback, $v );
 268                                         }
 269                                         $versions = implode( "\n  ", $versions );
 270                                 } else {
 271                                         $versions = preg_replace_callback( $pattern, $callback, $versions );
 272                                 }
 273
 274                                 $msg .= "Version:\n  $versions\n";
 275                         }
 276                 }
 277
 278                 return $msg;
 279         }
 280
 281         /**
 282          * Generates the parameter descriptions for this module, to be displayed in the
 283          * module's help.
 284          * @return string
 285          */
 286         public function makeHelpMsgParameters() {
 287                 $params = $this->getFinalParams();
 288                 if ( $params ) {
 289
 290                         $paramsDescription = $this->getFinalParamDescription();
 291                         $msg = '';
 292                         $paramPrefix = "\n" . str_repeat( ' ', 19 );
 293                         foreach ( $params as $paramName => $paramSettings ) {
 294                                 $desc = isset( $paramsDescription[$paramName] ) ? $paramsDescription[$paramName] : '';
 295                                 if ( is_array( $desc ) ) {
 296                                         $desc = implode( $paramPrefix, $desc );
 297                                 }
 298
 299                                 if ( !is_array( $paramSettings ) ) {
 300                                         $paramSettings = array(
 301                                                 self::PARAM_DFLT => $paramSettings,
 302                                         );
 303                                 }
 304
 305                                 $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ?
 306                                         $paramSettings[self::PARAM_DEPRECATED] : false;
 307                                 if ( $deprecated ) {
 308                                         $desc = "DEPRECATED! $desc";
 309                                 }
 310
 311                                 $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ?
 312                                         $paramSettings[self::PARAM_REQUIRED] : false;
 313                                 if ( $required ) {
 314                                         $desc .= $paramPrefix . "This parameter is required";
 315                                 }
 316
 317                                 $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 318                                 if ( isset( $type ) ) {
 319                                         if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 320                                                 $prompt = 'Values (separate with \'|\'): ';
 321                                         } else {
 322                                                 $prompt = 'One value: ';
 323                                         }
 324
 325                                         if ( is_array( $type ) ) {
 326                                                 $choices = array();
 327                                                 $nothingPrompt = false;
 328                                                 foreach ( $type as $t ) {
 329                                                         if ( $t === '' ) {
 330                                                                 $nothingPrompt = 'Can be empty, or ';
 331                                                         } else {
 332                                                                 $choices[] =  $t;
 333                                                         }
 334                                                 }
 335                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt . implode( ', ', $choices );
 336                                         } else {
 337                                                 switch ( $type ) {
 338                                                         case 'namespace':
 339                                                                 // Special handling because namespaces are type-limited, yet they are not given
 340                                                                 $desc .= $paramPrefix . $prompt . implode( ', ', MWNamespace::getValidNamespaces() );
 341                                                                 break;
 342                                                         case 'limit':
 343                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]} ({$paramSettings[self::PARAM_MAX2]} for bots) allowed";
 344                                                                 break;
 345                                                         case 'integer':
 346                                                                 $hasMin = isset( $paramSettings[self::PARAM_MIN] );
 347                                                                 $hasMax = isset( $paramSettings[self::PARAM_MAX] );
 348                                                                 if ( $hasMin || $hasMax ) {
 349                                                                         if ( !$hasMax ) {
 350                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self::PARAM_MIN]}";
 351                                                                         } elseif ( !$hasMin ) {
 352                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self::PARAM_MAX]}";
 353                                                                         } else {
 354                                                                                 $intRangeStr = "The value must be between {$paramSettings[self::PARAM_MIN]} and {$paramSettings[self::PARAM_MAX]}";
 355                                                                         }
 356
 357                                                                         $desc .= $paramPrefix . $intRangeStr;
 358                                                                 }
 359                                                                 break;
 360                                                 }
 361                                         }
 362                                 }
 363
 364                                 $default = is_array( $paramSettings ) ? ( isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null ) : $paramSettings;
 365                                 if ( !is_null( $default ) && $default !== false ) {
 366                                         $desc .= $paramPrefix . "Default: $default";
 367                                 }
 368
 369                                 $msg .= sprintf( "  %-14s - %s\n", $this->encodeParamName( $paramName ), $desc );
 370                         }
 371                         return $msg;
 372
 373                 } else {
 374                         return false;
 375                 }
 376         }
 377
 378         /**
 379          * Callback for preg_replace_callback() call in makeHelpMsg().
 380          * Replaces a source file name with a link to ViewVC
 381          */
 382         public function makeHelpMsg_callback( $matches ) {
 383                 global $wgAutoloadClasses, $wgAutoloadLocalClasses;
 384                 if ( isset( $wgAutoloadLocalClasses[get_class( $this )] ) ) {
 385                         $file = $wgAutoloadLocalClasses[get_class( $this )];
 386                 } elseif ( isset( $wgAutoloadClasses[get_class( $this )] ) ) {
 387                         $file = $wgAutoloadClasses[get_class( $this )];
 388                 }
 389
 390                 // Do some guesswork here
 391                 $path = strstr( $file, 'includes/api/' );
 392                 if ( $path === false ) {
 393                         $path = strstr( $file, 'extensions/' );
 394                 } else {
 395                         $path = 'phase3/' . $path;
 396                 }
 397
 398                 // Get the filename from $matches[2] instead of $file
 399                 // If they're not the same file, they're assumed to be in the
 400                 // same directory
 401                 // This is necessary to make stuff like ApiMain::getVersion()
 402                 // returning the version string for ApiBase work
 403                 if ( $path ) {
 404                         return "{$matches[0]}\n   http://svn.wikimedia.org/" .
 405                                 "viewvc/mediawiki/trunk/" . dirname( $path ) .
 406                                 "/{$matches[2]}";
 407                 }
 408                 return $matches[0];
 409         }
 410
 411         /**
 412          * Returns the description string for this module
 413          * @return mixed string or array of strings
 414          */
 415         protected function getDescription() {
 416                 return false;
 417         }
 418
 419         /**
 420          * Returns usage examples for this module. Return null if no examples are available.
 421          * @return mixed string or array of strings
 422          */
 423         protected function getExamples() {
 424                 return false;
 425         }
 426
 427         /**
 428          * Returns an array of allowed parameters (parameter name) => (default
 429          * value) or (parameter name) => (array with PARAM_* constants as keys)
 430          * Don't call this function directly: use getFinalParams() to allow
 431          * hooks to modify parameters as needed.
 432          * @return array
 433          */
 434         protected function getAllowedParams() {
 435                 return false;
 436         }
 437
 438         /**
 439          * Returns an array of parameter descriptions.
 440          * Don't call this functon directly: use getFinalParamDescription() to
 441          * allow hooks to modify descriptions as needed.
 442          * @return array
 443          */
 444         protected function getParamDescription() {
 445                 return false;
 446         }
 447
 448         /**
 449          * Get final list of parameters, after hooks have had a chance to
 450          * tweak it as needed.
 451          * @return array
 452          */
 453         public function getFinalParams() {
 454                 $params = $this->getAllowedParams();
 455                 wfRunHooks( 'APIGetAllowedParams', array( &$this, &$params ) );
 456                 return $params;
 457         }
 458
 459         /**
 460          * Get final description, after hooks have had a chance to tweak it as
 461          * needed.
 462          * @return array
 463          */
 464         public function getFinalParamDescription() {
 465                 $desc = $this->getParamDescription();
 466                 wfRunHooks( 'APIGetParamDescription', array( &$this, &$desc ) );
 467                 return $desc;
 468         }
 469
 470         /**
 471          * This method mangles parameter name based on the prefix supplied to the constructor.
 472          * Override this method to change parameter name during runtime
 473          * @param $paramName string Parameter name
 474          * @return string Prefixed parameter name
 475          */
 476         public function encodeParamName( $paramName ) {
 477                 return $this->mModulePrefix . $paramName;
 478         }
 479
 480         /**
 481          * Using getAllowedParams(), this function makes an array of the values
 482          * provided by the user, with key being the name of the variable, and
 483          * value - validated value from user or default. limits will not be
 484          * parsed if $parseLimit is set to false; use this when the max
 485          * limit is not definitive yet, e.g. when getting revisions.
 486          * @param $parseLimit Boolean: true by default
 487          * @return array
 488          */
 489         public function extractRequestParams( $parseLimit = true ) {
 490                 // Cache parameters, for performance and to avoid bug 24564.
 491                 if ( !isset( $this->mParamCache[$parseLimit] ) ) {
 492                         $params = $this->getFinalParams();
 493                         $results = array();
 494
 495                         if ( $params ) { // getFinalParams() can return false
 496                                 foreach ( $params as $paramName => $paramSettings ) {
 497                                         $results[$paramName] = $this->getParameterFromSettings(
 498                                                 $paramName, $paramSettings, $parseLimit );
 499                                 }
 500                         }
 501                         $this->mParamCache[$parseLimit] = $results;
 502                 }
 503                 return $this->mParamCache[$parseLimit];
 504         }
 505
 506         /**
 507          * Get a value for the given parameter
 508          * @param $paramName string Parameter name
 509          * @param $parseLimit bool see extractRequestParams()
 510          * @return mixed Parameter value
 511          */
 512         protected function getParameter( $paramName, $parseLimit = true ) {
 513                 $params = $this->getFinalParams();
 514                 $paramSettings = $params[$paramName];
 515                 return $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 516         }
 517
 518         /**
 519          * Die if none or more than one of a certain set of parameters is set and not false.
 520          * @param $params array of parameter names
 521          */
 522         public function requireOnlyOneParameter( $params ) {
 523                 $required = func_get_args();
 524                 array_shift( $required );
 525
 526                 $intersection = array_intersect( array_keys( array_filter( $params,
 527                                 create_function( '$x', 'return !is_null($x) && $x !== false;' )
 528                         ) ), $required );
 529                 if ( count( $intersection ) > 1 ) {
 530                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 531                 } elseif ( count( $intersection ) == 0 ) {
 532                         $this->dieUsage( 'One of the parameters ' . implode( ', ', $required ) . ' is required', 'missingparam' );
 533                 }
 534         }
 535
 536         /**
 537          * @deprecated use MWNamespace::getValidNamespaces()
 538          */
 539         public static function getValidNamespaces() {
 540                 return MWNamespace::getValidNamespaces();
 541         }
 542
 543         /**
 544          * Return true if we're to watch the page, false if not, null if no change.
 545          * @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 546          * @param $titleObj Title the page under consideration
 547          * @param $userOption The user option to consider when $watchlist=preferences.
 548          *      If not set will magically default to either watchdefault or watchcreations
 549          * @returns mixed
 550          */
 551         protected function getWatchlistValue ( $watchlist, $titleObj, $userOption = null ) {
 552                 switch ( $watchlist ) {
 553                         case 'watch':
 554                                 return true;
 555
 556                         case 'unwatch':
 557                                 return false;
 558
 559                         case 'preferences':
 560                                 global $wgUser;
 561                                 # If the user is already watching, don't bother checking
 562                                 if ( $titleObj->userIsWatching() ) {
 563                                         return null;
 564                                 }
 565                                 # If no user option was passed, use watchdefault or watchcreation
 566                                 if ( is_null( $userOption ) ) {
 567                                         $userOption = $titleObj->exists()
 568                                                 ? 'watchdefault' : 'watchcreations';
 569                                 }
 570                                 # If the corresponding user option is true, watch, else no change
 571                                 return $wgUser->getOption( $userOption ) ? true : null;
 572
 573                         case 'nochange':
 574                                 return null;
 575
 576                         default:
 577                                 return null;
 578                 }
 579         }
 580
 581         /**
 582          * Set a watch (or unwatch) based the based on a watchlist parameter.
 583          * @param $watch String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 584          * @param $titleObj Title the article's title to change
 585          * @param $userOption The user option to consider when $watch=preferences
 586          */
 587         protected function setWatch ( $watch, $titleObj, $userOption = null ) {
 588                 $value = $this->getWatchlistValue( $watch, $titleObj, $userOption );
 589                 if ( $value === null ) {
 590                         return;
 591                 }
 592
 593                 $articleObj = new Article( $titleObj );
 594                 if ( $value ) {
 595                         $articleObj->doWatch();
 596                 } else {
 597                         $articleObj->doUnwatch();
 598                 }
 599         }
 600
 601         /**
 602          * Using the settings determine the value for the given parameter
 603          *
 604          * @param $paramName String: parameter name
 605          * @param $paramSettings Mixed: default value or an array of settings
 606          *  using PARAM_* constants.
 607          * @param $parseLimit Boolean: parse limit?
 608          * @return mixed Parameter value
 609          */
 610         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 611                 // Some classes may decide to change parameter names
 612                 $encParamName = $this->encodeParamName( $paramName );
 613
 614                 if ( !is_array( $paramSettings ) ) {
 615                         $default = $paramSettings;
 616                         $multi = false;
 617                         $type = gettype( $paramSettings );
 618                         $dupes = false;
 619                         $deprecated = false;
 620                         $required = false;
 621                 } else {
 622                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 623                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 624                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 625                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 626                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 627                         $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ? $paramSettings[self::PARAM_REQUIRED] : false;
 628
 629                         // When type is not given, and no choices, the type is the same as $default
 630                         if ( !isset( $type ) ) {
 631                                 if ( isset( $default ) ) {
 632                                         $type = gettype( $default );
 633                                 } else {
 634                                         $type = 'NULL'; // allow everything
 635                                 }
 636                         }
 637                 }
 638
 639                 if ( $type == 'boolean' ) {
 640                         if ( isset( $default ) && $default !== false ) {
 641                                 // Having a default value of anything other than 'false' is pointless
 642                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 643                         }
 644
 645                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 646                 } else {
 647                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 648
 649                         if ( isset( $value ) && $type == 'namespace' ) {
 650                                 $type = MWNamespace::getValidNamespaces();
 651                         }
 652                 }
 653
 654                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 655                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 656                 }
 657
 658                 // More validation only when choices were not given
 659                 // choices were validated in parseMultiValue()
 660                 if ( isset( $value ) ) {
 661                         if ( !is_array( $type ) ) {
 662                                 switch ( $type ) {
 663                                         case 'NULL': // nothing to do
 664                                                 break;
 665                                         case 'string':
 666                                                 if ( $value === '' ) {
 667                                                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 668                                                 }
 669
 670                                                 break;
 671                                         case 'integer': // Force everything using intval() and optionally validate limits
 672
 673                                                 $value = is_array( $value ) ? array_map( 'intval', $value ) : intval( $value );
 674                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 675                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 676
 677                                                 if ( !is_null( $min ) || !is_null( $max ) ) {
 678                                                         $values = is_array( $value ) ? $value : array( $value );
 679                                                         foreach ( $values as &$v ) {
 680                                                                 $this->validateLimit( $paramName, $v, $min, $max );
 681                                                         }
 682                                                 }
 683                                                 break;
 684                                         case 'limit':
 685                                                 if ( !$parseLimit ) {
 686                                                         // Don't do any validation whatsoever
 687                                                         break;
 688                                                 }
 689                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 690                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 691                                                 }
 692                                                 if ( $multi ) {
 693                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 694                                                 }
 695                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 696                                                 if ( $value == 'max' ) {
 697                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 698                                                         $this->getResult()->setParsedLimit( $this->getModuleName(), $value );
 699                                                 } else {
 700                                                         $value = intval( $value );
 701                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 702                                                 }
 703                                                 break;
 704                                         case 'boolean':
 705                                                 if ( $multi ) {
 706                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 707                                                 }
 708                                                 break;
 709                                         case 'timestamp':
 710                                                 if ( $multi ) {
 711                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 712                                                 }
 713                                                 $value = wfTimestamp( TS_UNIX, $value );
 714                                                 if ( $value === 0 ) {
 715                                                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}" );
 716                                                 }
 717                                                 $value = wfTimestamp( TS_MW, $value );
 718                                                 break;
 719                                         case 'user':
 720                                                 if ( !is_array( $value ) ) {
 721                             $value = array( $value );
 722                         }
 723
 724                                                 foreach ( $value as $key => $val ) {
 725                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 726                                                         if ( is_null( $title ) ) {
 727                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 728                                                         }
 729                                                         $value[$key] = $title->getText();
 730                                                 }
 731
 732                                                 if ( !$multi ) {
 733                             $value = $value[0];
 734                         }
 735                         break;
 736                                         default:
 737                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 738                                 }
 739                         } else if ( !$dupes ) {
 740                                 // Throw out duplicates if requested
 741                                 $value = array_unique( $value );
 742                         }
 743
 744                         // Set a warning if a deprecated parameter has been passed
 745                         if ( $deprecated && $value !== false ) {
 746                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 747                         }
 748                 } else if ( $required ) {
 749                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 750                 }
 751
 752                 return $value;
 753         }
 754
 755         /**
 756          * Return an array of values that were given in a 'a|b|c' notation,
 757          * after it optionally validates them against the list allowed values.
 758          *
 759          * @param $valueName string The name of the parameter (for error
 760          *  reporting)
 761          * @param $value mixed The value being parsed
 762          * @param $allowMultiple bool Can $value contain more than one value
 763          *  separated by '|'?
 764          * @param $allowedValues mixed An array of values to check against. If
 765          *  null, all values are accepted.
 766          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 767          */
 768         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 769                 if ( trim( $value ) === '' && $allowMultiple ) {
 770                         return array();
 771                 }
 772
 773                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 774                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 775                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 776                         self::LIMIT_SML2 : self::LIMIT_SML1;
 777
 778                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 779                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 780                 }
 781
 782                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 783                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 784                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 785                 }
 786
 787                 if ( is_array( $allowedValues ) ) {
 788                         // Check for unknown values
 789                         $unknown = array_diff( $valuesList, $allowedValues );
 790                         if ( count( $unknown ) ) {
 791                                 if ( $allowMultiple ) {
 792                                         $s = count( $unknown ) > 1 ? 's' : '';
 793                                         $vals = implode( ", ", $unknown );
 794                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 795                                 } else {
 796                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 797                                 }
 798                         }
 799                         // Now throw them out
 800                         $valuesList = array_intersect( $valuesList, $allowedValues );
 801                 }
 802
 803                 return $allowMultiple ? $valuesList : $valuesList[0];
 804         }
 805
 806         /**
 807          * Validate the value against the minimum and user/bot maximum limits.
 808          * Prints usage info on failure.
 809          * @param $paramName string Parameter name
 810          * @param $value int Parameter value
 811          * @param $min int Minimum value
 812          * @param $max int Maximum value for users
 813          * @param $botMax int Maximum value for sysops/bots
 814          */
 815         function validateLimit( $paramName, &$value, $min, $max, $botMax = null ) {
 816                 if ( !is_null( $min ) && $value < $min ) {
 817                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)" );
 818                         $value = $min;
 819                 }
 820
 821                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 822                 if ( $this->getMain()->isInternalMode() ) {
 823                         return;
 824                 }
 825
 826                 // Optimization: do not check user's bot status unless really needed -- skips db query
 827                 // assumes $botMax >= $max
 828                 if ( !is_null( $max ) && $value > $max ) {
 829                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 830                                 if ( $value > $botMax ) {
 831                                         $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops" );
 832                                         $value = $botMax;
 833                                 }
 834                         } else {
 835                                 $this->setWarning( $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users" );
 836                                 $value = $max;
 837                         }
 838                 }
 839         }
 840
 841         /**
 842          * Truncate an array to a certain length.
 843          * @param $arr array Array to truncate
 844          * @param $limit int Maximum length
 845          * @return bool True if the array was truncated, false otherwise
 846          */
 847         public static function truncateArray( &$arr, $limit ) {
 848                 $modified = false;
 849                 while ( count( $arr ) > $limit ) {
 850                         array_pop( $arr );
 851                         $modified = true;
 852                 }
 853                 return $modified;
 854         }
 855
 856         /**
 857          * Throw a UsageException, which will (if uncaught) call the main module's
 858          * error handler and die with an error message.
 859          *
 860          * @param $description string One-line human-readable description of the
 861          *   error condition, e.g., "The API requires a valid action parameter"
 862          * @param $errorCode string Brief, arbitrary, stable string to allow easy
 863          *   automated identification of the error, e.g., 'unknown_action'
 864          * @param $httpRespCode int HTTP response code
 865          * @param $extradata array Data to add to the <error> element; array in ApiResult format
 866          */
 867         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
 868                 wfProfileClose();
 869                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
 870         }
 871
 872         /**
 873          * Array that maps message keys to error messages. $1 and friends are replaced.
 874          */
 875         public static $messageMap = array(
 876                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 877                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
 878                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
 879
 880                 // Messages from Title::getUserPermissionsErrors()
 881                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
 882                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
 883                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
 884                 'customcssjsprotected' => array( 'code' => 'customcssjsprotected', 'info' => "You're not allowed to edit custom CSS and JavaScript pages" ),
 885                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
 886                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
 887                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
 888                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
 889                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
 890                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
 891                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
 892                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
 893                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
 894                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
 895                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
 896                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
 897                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
 898
 899                 // Miscellaneous interface messages
 900                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
 901                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
 902                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
 903                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
 904                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
 905                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
 906                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
 907                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
 908                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
 909                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
 910                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
 911                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
 912                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
 913                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
 914                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
 915                 // 'badarticleerror' => shouldn't happen
 916                 // 'badtitletext' => shouldn't happen
 917                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
 918                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
 919                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
 920                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
 921                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
 922                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
 923                 '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." ),
 924                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
 925                 '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" ),
 926                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
 927                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
 928                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
 929                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
 930                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
 931                 '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" ),
 932                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
 933                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
 934                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
 935                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
 936                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
 937                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
 938                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 939                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 940                 'summaryrequired' => array( 'code' => 'summaryrequired', 'info' => 'Summary required' ),
 941
 942                 // API-specific messages
 943                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
 944                 '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" ),
 945                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
 946                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
 947                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
 948                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
 949                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
 950                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
 951                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
 952                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
 953                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
 954                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
 955                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
 956                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
 957                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
 958                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
 959                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
 960                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
 961                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
 962                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
 963                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
 964                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
 965                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
 966                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
 967                 'cantpurge' => array( 'code' => 'cantpurge', 'info' => "Only users with the 'purge' right can purge pages via the API" ),
 968                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
 969                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
 970                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
 971                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
 972                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
 973                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
 974                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
 975                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
 976                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
 977                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
 978                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
 979                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 980                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
 981                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
 982                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
 983                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
 984                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
 985                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
 986
 987                 // ApiEditPage messages
 988                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
 989                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
 990                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
 991                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
 992                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
 993                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
 994                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
 995                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
 996                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
 997                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
 998                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
 999                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
1000                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
1001                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
1002                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
1003
1004                 // uploadMsgs
1005                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
1006                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
1007                 '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' ),
1008                 'copyuploaddisabled' => array( 'code' => 'copyuploaddisabled', 'info' => 'Uploads by URL is not enabled.  Make sure $wgAllowCopyUploads is set to true in LocalSettings.php.' ),
1009         );
1010
1011         /**
1012          * Helper function for readonly errors
1013          */
1014         public function dieReadOnly() {
1015                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
1016                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
1017                         array( 'readonlyreason' => wfReadOnlyReason() ) );
1018         }
1019
1020         /**
1021          * Output the error message related to a certain array
1022          * @param $error array Element of a getUserPermissionsErrors()-style array
1023          */
1024         public function dieUsageMsg( $error ) {
1025                 $parsed = $this->parseMsg( $error );
1026                 $this->dieUsage( $parsed['info'], $parsed['code'] );
1027         }
1028
1029         /**
1030          * Return the error message related to a certain array
1031          * @param $error array Element of a getUserPermissionsErrors()-style array
1032          * @return array('code' => code, 'info' => info)
1033          */
1034         public function parseMsg( $error ) {
1035                 $key = array_shift( $error );
1036                 if ( isset( self::$messageMap[$key] ) ) {
1037                         return array( 'code' =>
1038                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
1039                                         'info' =>
1040                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
1041                         );
1042                 }
1043                 // If the key isn't present, throw an "unknown error"
1044                 return $this->parseMsg( array( 'unknownerror', $key ) );
1045         }
1046
1047         /**
1048          * Internal code errors should be reported with this method
1049          * @param $method string Method or function name
1050          * @param $message string Error message
1051          */
1052         protected static function dieDebug( $method, $message ) {
1053                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1054         }
1055
1056         /**
1057          * Indicates if this module needs maxlag to be checked
1058          * @return bool
1059          */
1060         public function shouldCheckMaxlag() {
1061                 return true;
1062         }
1063
1064         /**
1065          * Indicates whether this module requires read rights
1066          * @return bool
1067          */
1068         public function isReadMode() {
1069                 return true;
1070         }
1071         /**
1072          * Indicates whether this module requires write mode
1073          * @return bool
1074          */
1075         public function isWriteMode() {
1076                 return false;
1077         }
1078
1079         /**
1080          * Indicates whether this module must be called with a POST request
1081          * @return bool
1082          */
1083         public function mustBePosted() {
1084                 return false;
1085         }
1086
1087         /**
1088          * 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
1089          * @returns bool
1090          */
1091         public function getTokenSalt() {
1092                 return false;
1093         }
1094
1095         /**
1096         * Gets the user for whom to get the watchlist
1097         *
1098         * @returns User
1099         */
1100         public function getWatchlistUser( $params ) {
1101                 global $wgUser;
1102                 if ( !is_null( $params['owner'] ) && !is_null( $params['token'] ) ) {
1103                         $user = User::newFromName( $params['owner'], false );
1104                         if ( !$user->getId() ) {
1105                                 $this->dieUsage( 'Specified user does not exist', 'bad_wlowner' );
1106                         }
1107                         $token = $user->getOption( 'watchlisttoken' );
1108                         if ( $token == '' || $token != $params['token'] ) {
1109                                 $this->dieUsage( 'Incorrect watchlist token provided -- please set a correct token in Special:Preferences', 'bad_wltoken' );
1110                         }
1111                 } else {
1112                         if ( !$wgUser->isLoggedIn() ) {
1113                                 $this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
1114                         }
1115                         $user = $wgUser;
1116                 }
1117                 return $user;
1118         }
1119
1120         /**
1121          * Returns a list of all possible errors returned by the module
1122          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1123          */
1124         public function getPossibleErrors() {
1125                 $ret = array();
1126
1127                 $params = $this->getFinalParams();
1128                 if ( $params ) {
1129                         foreach ( $params as $paramName => $paramSettings ) {
1130                                 if( isset( $paramSettings[ApiBase::PARAM_REQUIRED] ) ) {
1131                                         $ret[] = array( 'missingparam', $paramName );
1132                                 }
1133                         }
1134                 }
1135
1136                 if ( $this->mustBePosted() ) {
1137                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1138                 }
1139
1140                 if ( $this->isReadMode() ) {
1141                         $ret[] = array( 'readrequired' );
1142                 }
1143
1144                 if ( $this->isWriteMode() ) {
1145                         $ret[] = array( 'writerequired' );
1146                         $ret[] = array( 'writedisabled' );
1147                 }
1148
1149                 if ( $this->getTokenSalt() !== false ) {
1150                         $ret[] = array( 'missingparam', 'token' );
1151                         $ret[] = array( 'sessionfailure' );
1152                 }
1153
1154                 return $ret;
1155         }
1156
1157         /**
1158          * Parses a list of errors into a standardised format
1159          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1160          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1161          */
1162         public function parseErrors( $errors ) {
1163                 $ret = array();
1164
1165                 foreach ( $errors as $row ) {
1166                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1167                                 $ret[] = $row;
1168                         } else {
1169                                 $ret[] = $this->parseMsg( $row );
1170                         }
1171                 }
1172                 return $ret;
1173         }
1174
1175         /**
1176          * Profiling: total module execution time
1177          */
1178         private $mTimeIn = 0, $mModuleTime = 0;
1179
1180         /**
1181          * Start module profiling
1182          */
1183         public function profileIn() {
1184                 if ( $this->mTimeIn !== 0 ) {
1185                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1186                 }
1187                 $this->mTimeIn = microtime( true );
1188                 wfProfileIn( $this->getModuleProfileName() );
1189         }
1190
1191         /**
1192          * End module profiling
1193          */
1194         public function profileOut() {
1195                 if ( $this->mTimeIn === 0 ) {
1196                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1197                 }
1198                 if ( $this->mDBTimeIn !== 0 ) {
1199                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1200                 }
1201
1202                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1203                 $this->mTimeIn = 0;
1204                 wfProfileOut( $this->getModuleProfileName() );
1205         }
1206
1207         /**
1208          * When modules crash, sometimes it is needed to do a profileOut() regardless
1209          * of the profiling state the module was in. This method does such cleanup.
1210          */
1211         public function safeProfileOut() {
1212                 if ( $this->mTimeIn !== 0 ) {
1213                         if ( $this->mDBTimeIn !== 0 ) {
1214                                 $this->profileDBOut();
1215                         }
1216                         $this->profileOut();
1217                 }
1218         }
1219
1220         /**
1221          * Total time the module was executed
1222          * @return float
1223          */
1224         public function getProfileTime() {
1225                 if ( $this->mTimeIn !== 0 ) {
1226                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1227                 }
1228                 return $this->mModuleTime;
1229         }
1230
1231         /**
1232          * Profiling: database execution time
1233          */
1234         private $mDBTimeIn = 0, $mDBTime = 0;
1235
1236         /**
1237          * Start module profiling
1238          */
1239         public function profileDBIn() {
1240                 if ( $this->mTimeIn === 0 ) {
1241                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1242                 }
1243                 if ( $this->mDBTimeIn !== 0 ) {
1244                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1245                 }
1246                 $this->mDBTimeIn = microtime( true );
1247                 wfProfileIn( $this->getModuleProfileName( true ) );
1248         }
1249
1250         /**
1251          * End database profiling
1252          */
1253         public function profileDBOut() {
1254                 if ( $this->mTimeIn === 0 ) {
1255                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1256                 }
1257                 if ( $this->mDBTimeIn === 0 ) {
1258                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1259                 }
1260
1261                 $time = microtime( true ) - $this->mDBTimeIn;
1262                 $this->mDBTimeIn = 0;
1263
1264                 $this->mDBTime += $time;
1265                 $this->getMain()->mDBTime += $time;
1266                 wfProfileOut( $this->getModuleProfileName( true ) );
1267         }
1268
1269         /**
1270          * Total time the module used the database
1271          * @return float
1272          */
1273         public function getProfileDBTime() {
1274                 if ( $this->mDBTimeIn !== 0 ) {
1275                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1276                 }
1277                 return $this->mDBTime;
1278         }
1279
1280         /**
1281          * Debugging function that prints a value and an optional backtrace
1282          * @param $value mixed Value to print
1283          * @param $name string Description of the printed value
1284          * @param $backtrace bool If true, print a backtrace
1285          */
1286         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1287                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1288                 var_export( $value );
1289                 if ( $backtrace ) {
1290                         print "\n" . wfBacktrace();
1291                 }
1292                 print "\n</pre>\n";
1293         }
1294
1295         /**
1296          * Returns a string that identifies the version of this class.
1297          * @return string
1298          */
1299         public static function getBaseVersion() {
1300                 return __CLASS__ . ': $Id$';
1301         }
1302 }