includes/api/ApiBase.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 5, 2006
   6  *
   7  * Copyright © 2006, 2010 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This abstract class implements many basic API functions, and is the base of
  29  * all API classes.
  30  * The class functions are divided into several areas of functionality:
  31  *
  32  * Module parameters: Derived classes can define getAllowedParams() to specify
  33  *      which parameters to expect, how to parse and validate them.
  34  *
  35  * Profiling: various methods to allow keeping tabs on various tasks and their
  36  *      time costs
  37  *
  38  * Self-documentation: code to allow the API to document its own state
  39  *
  40  * @ingroup API
  41  */
  42 abstract class ApiBase {
  43
  44         // These constants allow modules to specify exactly how to treat incoming parameters.
  45
  46         const PARAM_DFLT = 0; // Default value of the parameter
  47         const PARAM_ISMULTI = 1; // Boolean, do we accept more than one item for this parameter (e.g.: titles)?
  48         const PARAM_TYPE = 2; // Can be either a string type (e.g.: 'integer') or an array of allowed values
  49         const PARAM_MAX = 3; // Max value allowed for a parameter. Only applies if TYPE='integer'
  50         const PARAM_MAX2 = 4; // Max value allowed for a parameter for bots and sysops. Only applies if TYPE='integer'
  51         const PARAM_MIN = 5; // Lowest value allowed for a parameter. Only applies if TYPE='integer'
  52         const PARAM_ALLOW_DUPLICATES = 6; // Boolean, do we allow the same value to be set more than once when ISMULTI=true
  53         const PARAM_DEPRECATED = 7; // Boolean, is the parameter deprecated (will show a warning)
  54         const PARAM_REQUIRED = 8; // Boolean, is the parameter required?
  55         const PARAM_RANGE_ENFORCE = 9; // Boolean, if MIN/MAX are set, enforce (die) these? Only applies if TYPE='integer' Use with extreme caution
  56
  57         const LIMIT_BIG1 = 500; // Fast query, std user limit
  58         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  59         const LIMIT_SML1 = 50; // Slow query, std user limit
  60         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  61
  62         private $mMainModule, $mModuleName, $mModulePrefix;
  63         private $mParamCache = array();
  64
  65         /**
  66          * Constructor
  67          * @param $mainModule ApiMain object
  68          * @param $moduleName string Name of this module
  69          * @param $modulePrefix string Prefix to use for parameter names
  70          */
  71         public function __construct( $mainModule, $moduleName, $modulePrefix = '' ) {
  72                 $this->mMainModule = $mainModule;
  73                 $this->mModuleName = $moduleName;
  74                 $this->mModulePrefix = $modulePrefix;
  75         }
  76
  77         /*****************************************************************************
  78          * ABSTRACT METHODS                                                          *
  79          *****************************************************************************/
  80
  81         /**
  82          * Evaluates the parameters, performs the requested query, and sets up
  83          * the result. Concrete implementations of ApiBase must override this
  84          * method to provide whatever functionality their module offers.
  85          * Implementations must not produce any output on their own and are not
  86          * expected to handle any errors.
  87          *
  88          * The execute() method will be invoked directly by ApiMain immediately
  89          * before the result of the module is output. Aside from the
  90          * constructor, implementations should assume that no other methods
  91          * will be called externally on the module before the result is
  92          * processed.
  93          *
  94          * The result data should be stored in the ApiResult object available
  95          * through getResult().
  96          */
  97         public abstract function execute();
  98
  99         /**
 100          * Returns a string that identifies the version of the extending class.
 101          * Typically includes the class name, the svn revision, timestamp, and
 102          * last author. Usually done with SVN's Id keyword
 103          * @return string
 104          */
 105         public abstract function getVersion();
 106
 107         /**
 108          * Get the name of the module being executed by this instance
 109          * @return string
 110          */
 111         public function getModuleName() {
 112                 return $this->mModuleName;
 113         }
 114
 115         /**
 116          * Get parameter prefix (usually two letters or an empty string).
 117          * @return string
 118          */
 119         public function getModulePrefix() {
 120                 return $this->mModulePrefix;
 121         }
 122
 123         /**
 124          * Get the name of the module as shown in the profiler log
 125          *
 126          * @param $db DatabaseBase
 127          *
 128          * @return string
 129          */
 130         public function getModuleProfileName( $db = false ) {
 131                 if ( $db ) {
 132                         return 'API:' . $this->mModuleName . '-DB';
 133                 } else {
 134                         return 'API:' . $this->mModuleName;
 135                 }
 136         }
 137
 138         /**
 139          * Get the main module
 140          * @return ApiMain object
 141          */
 142         public function getMain() {
 143                 return $this->mMainModule;
 144         }
 145
 146         /**
 147          * Returns true if this module is the main module ($this === $this->mMainModule),
 148          * false otherwise.
 149          * @return bool
 150          */
 151         public function isMain() {
 152                 return $this === $this->mMainModule;
 153         }
 154
 155         /**
 156          * Get the result object
 157          * @return ApiResult
 158          */
 159         public function getResult() {
 160                 // Main module has getResult() method overriden
 161                 // Safety - avoid infinite loop:
 162                 if ( $this->isMain() ) {
 163                         ApiBase::dieDebug( __METHOD__, 'base method was called on main module. ' );
 164                 }
 165                 return $this->getMain()->getResult();
 166         }
 167
 168         /**
 169          * Get the result data array (read-only)
 170          * @return array
 171          */
 172         public function getResultData() {
 173                 return $this->getResult()->getData();
 174         }
 175
 176         /**
 177          * Set warning section for this module. Users should monitor this
 178          * section to notice any changes in API. Multiple calls to this
 179          * function will result in the warning messages being separated by
 180          * newlines
 181          * @param $warning string Warning message
 182          */
 183         public function setWarning( $warning ) {
 184                 $data = $this->getResult()->getData();
 185                 if ( isset( $data['warnings'][$this->getModuleName()] ) ) {
 186                         // Don't add duplicate warnings
 187                         $warn_regex = preg_quote( $warning, '/' );
 188                         if ( preg_match( "/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*'] ) ) {
 189                                 return;
 190                         }
 191                         $oldwarning = $data['warnings'][$this->getModuleName()]['*'];
 192                         // If there is a warning already, append it to the existing one
 193                         $warning = "$oldwarning\n$warning";
 194                         $this->getResult()->unsetValue( 'warnings', $this->getModuleName() );
 195                 }
 196                 $msg = array();
 197                 ApiResult::setContent( $msg, $warning );
 198                 $this->getResult()->disableSizeCheck();
 199                 $this->getResult()->addValue( 'warnings', $this->getModuleName(), $msg );
 200                 $this->getResult()->enableSizeCheck();
 201         }
 202
 203         /**
 204          * If the module may only be used with a certain format module,
 205          * it should override this method to return an instance of that formatter.
 206          * A value of null means the default format will be used.
 207          * @return mixed instance of a derived class of ApiFormatBase, or null
 208          */
 209         public function getCustomPrinter() {
 210                 return null;
 211         }
 212
 213         /**
 214          * Generates help message for this module, or false if there is no description
 215          * @return mixed string or false
 216          */
 217         public function makeHelpMsg() {
 218                 static $lnPrfx = "\n  ";
 219
 220                 $msg = $this->getDescription();
 221
 222                 if ( $msg !== false ) {
 223
 224                         if ( !is_array( $msg ) ) {
 225                                 $msg = array(
 226                                         $msg
 227                                 );
 228                         }
 229                         $msg = $lnPrfx . implode( $lnPrfx, $msg ) . "\n";
 230
 231                         if ( $this->isReadMode() ) {
 232                                 $msg .= "\nThis module requires read rights";
 233                         }
 234                         if ( $this->isWriteMode() ) {
 235                                 $msg .= "\nThis module requires write rights";
 236                         }
 237                         if ( $this->mustBePosted() ) {
 238                                 $msg .= "\nThis module only accepts POST requests";
 239                         }
 240                         if ( $this->isReadMode() || $this->isWriteMode() ||
 241                                         $this->mustBePosted() )
 242                         {
 243                                 $msg .= "\n";
 244                         }
 245
 246                         // Parameters
 247                         $paramsMsg = $this->makeHelpMsgParameters();
 248                         if ( $paramsMsg !== false ) {
 249                                 $msg .= "Parameters:\n$paramsMsg";
 250                         }
 251
 252                         // Examples
 253                         $examples = $this->getExamples();
 254                         if ( $examples !== false ) {
 255                                 if ( !is_array( $examples ) ) {
 256                                         $examples = array(
 257                                                 $examples
 258                                         );
 259                                 }
 260
 261                                 if ( count( $examples ) > 0 ) {
 262                                         $msg .= 'Example' . ( count( $examples ) > 1 ? 's' : '' ) . ":\n  ";
 263                                         $msg .= implode( $lnPrfx, $examples ) . "\n";
 264                                 }
 265                         }
 266
 267                         if ( $this->getMain()->getShowVersions() ) {
 268                                 $versions = $this->getVersion();
 269                                 $pattern = '/(\$.*) ([0-9a-z_]+\.php) (.*\$)/i';
 270                                 $callback = array( $this, 'makeHelpMsg_callback' );
 271
 272                                 if ( is_array( $versions ) ) {
 273                                         foreach ( $versions as &$v ) {
 274                                                 $v = preg_replace_callback( $pattern, $callback, $v );
 275                                         }
 276                                         $versions = implode( "\n  ", $versions );
 277                                 } else {
 278                                         $versions = preg_replace_callback( $pattern, $callback, $versions );
 279                                 }
 280
 281                                 $msg .= "Version:\n  $versions\n";
 282                         }
 283                 }
 284
 285                 return $msg;
 286         }
 287
 288         /**
 289          * Generates the parameter descriptions for this module, to be displayed in the
 290          * module's help.
 291          * @return string or false
 292          */
 293         public function makeHelpMsgParameters() {
 294                 $params = $this->getFinalParams();
 295                 if ( $params ) {
 296
 297                         $paramsDescription = $this->getFinalParamDescription();
 298                         $msg = '';
 299                         $paramPrefix = "\n" . str_repeat( ' ', 24 );
 300                         $descWordwrap = "\n" . str_repeat( ' ', 28 );
 301                         foreach ( $params as $paramName => $paramSettings ) {
 302                                 $desc = isset( $paramsDescription[$paramName] ) ? $paramsDescription[$paramName] : '';
 303                                 if ( is_array( $desc ) ) {
 304                                         $desc = implode( $paramPrefix, $desc );
 305                                 }
 306
 307                                 if ( !is_array( $paramSettings ) ) {
 308                                         $paramSettings = array(
 309                                                 self::PARAM_DFLT => $paramSettings,
 310                                         );
 311                                 }
 312
 313                                 $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ?
 314                                         $paramSettings[self::PARAM_DEPRECATED] : false;
 315                                 if ( $deprecated ) {
 316                                         $desc = "DEPRECATED! $desc";
 317                                 }
 318
 319                                 $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ?
 320                                         $paramSettings[self::PARAM_REQUIRED] : false;
 321                                 if ( $required ) {
 322                                         $desc .= $paramPrefix . "This parameter is required";
 323                                 }
 324
 325                                 $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 326                                 if ( isset( $type ) ) {
 327                                         if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 328                                                 $prompt = 'Values (separate with \'|\'): ';
 329                                         } else {
 330                                                 $prompt = 'One value: ';
 331                                         }
 332
 333                                         if ( is_array( $type ) ) {
 334                                                 $choices = array();
 335                                                 $nothingPrompt = false;
 336                                                 foreach ( $type as $t ) {
 337                                                         if ( $t === '' ) {
 338                                                                 $nothingPrompt = 'Can be empty, or ';
 339                                                         } else {
 340                                                                 $choices[] =  $t;
 341                                                         }
 342                                                 }
 343                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt;
 344                                                 $choicesstring = implode( ', ', $choices );
 345                                                 $desc .= wordwrap( $choicesstring, 100, $descWordwrap );
 346                                         } else {
 347                                                 switch ( $type ) {
 348                                                         case 'namespace':
 349                                                                 // Special handling because namespaces are type-limited, yet they are not given
 350                                                                 $desc .= $paramPrefix . $prompt;
 351                                                                 $desc .= wordwrap( implode( ', ', MWNamespace::getValidNamespaces() ),
 352                                                                         100, $descWordwrap );
 353                                                                 break;
 354                                                         case 'limit':
 355                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]}";
 356                                                                 if ( isset( $paramSettings[self::PARAM_MAX2] ) ) {
 357                                                                         $desc .= " ({$paramSettings[self::PARAM_MAX2]} for bots)";
 358                                                                 }
 359                                                                 $desc .= ' allowed';
 360                                                                 break;
 361                                                         case 'integer':
 362                                                                 $hasMin = isset( $paramSettings[self::PARAM_MIN] );
 363                                                                 $hasMax = isset( $paramSettings[self::PARAM_MAX] );
 364                                                                 if ( $hasMin || $hasMax ) {
 365                                                                         if ( !$hasMax ) {
 366                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self::PARAM_MIN]}";
 367                                                                         } elseif ( !$hasMin ) {
 368                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self::PARAM_MAX]}";
 369                                                                         } else {
 370                                                                                 $intRangeStr = "The value must be between {$paramSettings[self::PARAM_MIN]} and {$paramSettings[self::PARAM_MAX]}";
 371                                                                         }
 372
 373                                                                         $desc .= $paramPrefix . $intRangeStr;
 374                                                                 }
 375                                                                 break;
 376                                                 }
 377
 378                                                 if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 379                                                         $isArray = is_array( $paramSettings[self::PARAM_TYPE] );
 380
 381                                                         if ( !$isArray
 382                                                                         || $isArray && count( $paramSettings[self::PARAM_TYPE] ) > self::LIMIT_SML1 ) {
 383                                                                 $desc .= $paramPrefix . "Maximum number of values " .
 384                                                                         self::LIMIT_SML1 . " (" . self::LIMIT_SML2 . " for bots)";
 385                                                         }
 386                                                 }
 387                                         }
 388                                 }
 389
 390                                 $default = is_array( $paramSettings )
 391                                                 ? ( isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null )
 392                                                 : $paramSettings;
 393                                 if ( !is_null( $default ) && $default !== false ) {
 394                                         $desc .= $paramPrefix . "Default: $default";
 395                                 }
 396
 397                                 $msg .= sprintf( "  %-19s - %s\n", $this->encodeParamName( $paramName ), $desc );
 398                         }
 399                         return $msg;
 400
 401                 } else {
 402                         return false;
 403                 }
 404         }
 405
 406         /**
 407          * Callback for preg_replace_callback() call in makeHelpMsg().
 408          * Replaces a source file name with a link to ViewVC
 409          *
 410          * @return string
 411          */
 412         public function makeHelpMsg_callback( $matches ) {
 413                 global $wgAutoloadClasses, $wgAutoloadLocalClasses;
 414
 415                 $file = '';
 416                 if ( isset( $wgAutoloadLocalClasses[get_class( $this )] ) ) {
 417                         $file = $wgAutoloadLocalClasses[get_class( $this )];
 418                 } elseif ( isset( $wgAutoloadClasses[get_class( $this )] ) ) {
 419                         $file = $wgAutoloadClasses[get_class( $this )];
 420                 }
 421
 422                 // Do some guesswork here
 423                 $path = strstr( $file, 'includes/api/' );
 424                 if ( $path === false ) {
 425                         $path = strstr( $file, 'extensions/' );
 426                 } else {
 427                         $path = 'phase3/' . $path;
 428                 }
 429
 430                 // Get the filename from $matches[2] instead of $file
 431                 // If they're not the same file, they're assumed to be in the
 432                 // same directory
 433                 // This is necessary to make stuff like ApiMain::getVersion()
 434                 // returning the version string for ApiBase work
 435                 if ( $path ) {
 436                         return "{$matches[0]}\n   http://svn.wikimedia.org/" .
 437                                 "viewvc/mediawiki/trunk/" . dirname( $path ) .
 438                                 "/{$matches[2]}";
 439                 }
 440                 return $matches[0];
 441         }
 442
 443         /**
 444          * Returns the description string for this module
 445          * @return mixed string or array of strings
 446          */
 447         protected function getDescription() {
 448                 return false;
 449         }
 450
 451         /**
 452          * Returns usage examples for this module. Return null if no examples are available.
 453          * @return mixed string or array of strings
 454          */
 455         protected function getExamples() {
 456                 return false;
 457         }
 458
 459         /**
 460          * Returns an array of allowed parameters (parameter name) => (default
 461          * value) or (parameter name) => (array with PARAM_* constants as keys)
 462          * Don't call this function directly: use getFinalParams() to allow
 463          * hooks to modify parameters as needed.
 464          * @return array or false
 465          */
 466         protected function getAllowedParams() {
 467                 return false;
 468         }
 469
 470         /**
 471          * Returns an array of parameter descriptions.
 472          * Don't call this functon directly: use getFinalParamDescription() to
 473          * allow hooks to modify descriptions as needed.
 474          * @return array or false
 475          */
 476         protected function getParamDescription() {
 477                 return false;
 478         }
 479
 480         /**
 481          * Get final list of parameters, after hooks have had a chance to
 482          * tweak it as needed.
 483          * @return array or false
 484          */
 485         public function getFinalParams() {
 486                 $params = $this->getAllowedParams();
 487                 wfRunHooks( 'APIGetAllowedParams', array( &$this, &$params ) );
 488                 return $params;
 489         }
 490
 491         /**
 492          * Get final description, after hooks have had a chance to tweak it as
 493          * needed.
 494          * @return array
 495          */
 496         public function getFinalParamDescription() {
 497                 $desc = $this->getParamDescription();
 498                 wfRunHooks( 'APIGetParamDescription', array( &$this, &$desc ) );
 499                 return $desc;
 500         }
 501
 502         /**
 503          * This method mangles parameter name based on the prefix supplied to the constructor.
 504          * Override this method to change parameter name during runtime
 505          * @param $paramName string Parameter name
 506          * @return string Prefixed parameter name
 507          */
 508         public function encodeParamName( $paramName ) {
 509                 return $this->mModulePrefix . $paramName;
 510         }
 511
 512         /**
 513          * Using getAllowedParams(), this function makes an array of the values
 514          * provided by the user, with key being the name of the variable, and
 515          * value - validated value from user or default. limits will not be
 516          * parsed if $parseLimit is set to false; use this when the max
 517          * limit is not definitive yet, e.g. when getting revisions.
 518          * @param $parseLimit Boolean: true by default
 519          * @return array
 520          */
 521         public function extractRequestParams( $parseLimit = true ) {
 522                 // Cache parameters, for performance and to avoid bug 24564.
 523                 if ( !isset( $this->mParamCache[$parseLimit] ) ) {
 524                         $params = $this->getFinalParams();
 525                         $results = array();
 526
 527                         if ( $params ) { // getFinalParams() can return false
 528                                 foreach ( $params as $paramName => $paramSettings ) {
 529                                         $results[$paramName] = $this->getParameterFromSettings(
 530                                                 $paramName, $paramSettings, $parseLimit );
 531                                 }
 532                         }
 533                         $this->mParamCache[$parseLimit] = $results;
 534                 }
 535                 return $this->mParamCache[$parseLimit];
 536         }
 537
 538         /**
 539          * Get a value for the given parameter
 540          * @param $paramName string Parameter name
 541          * @param $parseLimit bool see extractRequestParams()
 542          * @return mixed Parameter value
 543          */
 544         protected function getParameter( $paramName, $parseLimit = true ) {
 545                 $params = $this->getFinalParams();
 546                 $paramSettings = $params[$paramName];
 547                 return $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 548         }
 549
 550         /**
 551          * Die if none or more than one of a certain set of parameters is set and not false.
 552          * @param $params array of parameter names
 553          */
 554         public function requireOnlyOneParameter( $params ) {
 555                 $required = func_get_args();
 556                 array_shift( $required );
 557
 558                 $intersection = array_intersect( array_keys( array_filter( $params,
 559                                 array( $this, "parameterNotEmpty" ) ) ), $required );
 560
 561                 if ( count( $intersection ) > 1 ) {
 562                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 563                 } elseif ( count( $intersection ) == 0 ) {
 564                         $this->dieUsage( 'One of the parameters ' . implode( ', ', $required ) . ' is required', 'missingparam' );
 565                 }
 566         }
 567
 568         /**
 569          * Generates the possible errors requireOnlyOneParameter() can die with
 570          *
 571          * @param $params array
 572          * @return array
 573          */
 574         public function getRequireOnlyOneParameterErrorMessages( $params ) {
 575                 $p = $this->getModulePrefix();
 576                 $params = implode( ", {$p}", $params );
 577
 578                 return array(
 579                         array( 'code' => "{$p}missingparam", 'info' => "One of the parameters {$p}{$params} is required" ),
 580                         array( 'code' => "{$p}invalidparammix", 'info' => "The parameters {$p}{$params} can not be used together" )
 581                 );
 582         }
 583
 584         /**
 585          * Callback function used in requireOnlyOneParameter to check whether reequired parameters are set
 586          *
 587          * @param  $x object Parameter to check is not null/false
 588          * @return bool
 589          */
 590         private function parameterNotEmpty( $x ) {
 591                 return !is_null( $x ) && $x !== false;
 592         }
 593
 594         /**
 595          * @deprecated since 1.17 use MWNamespace::getValidNamespaces()
 596          */
 597         public static function getValidNamespaces() {
 598                 return MWNamespace::getValidNamespaces();
 599         }
 600
 601         /**
 602          * Return true if we're to watch the page, false if not, null if no change.
 603          * @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 604          * @param $titleObj Title the page under consideration
 605          * @param $userOption String The user option to consider when $watchlist=preferences.
 606          *      If not set will magically default to either watchdefault or watchcreations
 607          * @return bool
 608          */
 609         protected function getWatchlistValue ( $watchlist, $titleObj, $userOption = null ) {
 610
 611                 $userWatching = $titleObj->userIsWatching();
 612
 613                 global $wgUser;
 614                 switch ( $watchlist ) {
 615                         case 'watch':
 616                                 return true;
 617
 618                         case 'unwatch':
 619                                 return false;
 620
 621                         case 'preferences':
 622                                 # If the user is already watching, don't bother checking
 623                                 if ( $userWatching ) {
 624                                         return true;
 625                                 }
 626                                 # If no user option was passed, use watchdefault or watchcreation
 627                                 if ( is_null( $userOption ) ) {
 628                                         $userOption = $titleObj->exists()
 629                                                 ? 'watchdefault' : 'watchcreations';
 630                                 }
 631                                 # Watch the article based on the user preference
 632                                 return (bool)$wgUser->getOption( $userOption );
 633
 634                         case 'nochange':
 635                                 return $userWatching;
 636
 637                         default:
 638                                 return $userWatching;
 639                 }
 640         }
 641
 642         /**
 643          * Set a watch (or unwatch) based the based on a watchlist parameter.
 644          * @param $watch String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 645          * @param $titleObj Title the article's title to change
 646          * @param $userOption String The user option to consider when $watch=preferences
 647          */
 648         protected function setWatch ( $watch, $titleObj, $userOption = null ) {
 649                 $value = $this->getWatchlistValue( $watch, $titleObj, $userOption );
 650                 if ( $value === null ) {
 651                         return;
 652                 }
 653
 654                 $articleObj = new Article( $titleObj );
 655                 if ( $value ) {
 656                         Action::factory( 'watch', $articleObj )->execute();
 657                 } else {
 658                         Action::factory( 'unwatch', $articleObj )->execute();
 659                 }
 660         }
 661
 662         /**
 663          * Using the settings determine the value for the given parameter
 664          *
 665          * @param $paramName String: parameter name
 666          * @param $paramSettings Mixed: default value or an array of settings
 667          *  using PARAM_* constants.
 668          * @param $parseLimit Boolean: parse limit?
 669          * @return mixed Parameter value
 670          */
 671         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 672                 // Some classes may decide to change parameter names
 673                 $encParamName = $this->encodeParamName( $paramName );
 674
 675                 if ( !is_array( $paramSettings ) ) {
 676                         $default = $paramSettings;
 677                         $multi = false;
 678                         $type = gettype( $paramSettings );
 679                         $dupes = false;
 680                         $deprecated = false;
 681                         $required = false;
 682                 } else {
 683                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 684                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 685                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 686                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 687                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 688                         $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ? $paramSettings[self::PARAM_REQUIRED] : false;
 689
 690                         // When type is not given, and no choices, the type is the same as $default
 691                         if ( !isset( $type ) ) {
 692                                 if ( isset( $default ) ) {
 693                                         $type = gettype( $default );
 694                                 } else {
 695                                         $type = 'NULL'; // allow everything
 696                                 }
 697                         }
 698                 }
 699
 700                 if ( $type == 'boolean' ) {
 701                         if ( isset( $default ) && $default !== false ) {
 702                                 // Having a default value of anything other than 'false' is pointless
 703                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 704                         }
 705
 706                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 707                 } else {
 708                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 709
 710                         if ( isset( $value ) && $type == 'namespace' ) {
 711                                 $type = MWNamespace::getValidNamespaces();
 712                         }
 713                 }
 714
 715                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 716                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 717                 }
 718
 719                 // More validation only when choices were not given
 720                 // choices were validated in parseMultiValue()
 721                 if ( isset( $value ) ) {
 722                         if ( !is_array( $type ) ) {
 723                                 switch ( $type ) {
 724                                         case 'NULL': // nothing to do
 725                                                 break;
 726                                         case 'string':
 727                                                 if ( $required && $value === '' ) {
 728                                                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 729                                                 }
 730
 731                                                 break;
 732                                         case 'integer': // Force everything using intval() and optionally validate limits
 733                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 734                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 735                                                 $enforceLimits = isset ( $paramSettings[self::PARAM_RANGE_ENFORCE] )
 736                                                                 ? $paramSettings[self::PARAM_RANGE_ENFORCE] : false;
 737
 738                                                 if ( is_array( $value ) ) {
 739                                                         $value = array_map( 'intval', $value );
 740                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 741                                                                 foreach ( $value as &$v ) {
 742                                                                         $this->validateLimit( $paramName, $v, $min, $max, null, $enforceLimits );
 743                                                                 }
 744                                                         }
 745                                                 } else {
 746                                                         $value = intval( $value );
 747                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 748                                                                 $this->validateLimit( $paramName, $value, $min, $max, null, $enforceLimits );
 749                                                         }
 750                                                 }
 751                                                 break;
 752                                         case 'limit':
 753                                                 if ( !$parseLimit ) {
 754                                                         // Don't do any validation whatsoever
 755                                                         break;
 756                                                 }
 757                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 758                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 759                                                 }
 760                                                 if ( $multi ) {
 761                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 762                                                 }
 763                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 764                                                 if ( $value == 'max' ) {
 765                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 766                                                         $this->getResult()->setParsedLimit( $this->getModuleName(), $value );
 767                                                 } else {
 768                                                         $value = intval( $value );
 769                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 770                                                 }
 771                                                 break;
 772                                         case 'boolean':
 773                                                 if ( $multi ) {
 774                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 775                                                 }
 776                                                 break;
 777                                         case 'timestamp':
 778                                                 if ( $multi ) {
 779                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 780                                                 }
 781                                                 $value = wfTimestamp( TS_UNIX, $value );
 782                                                 if ( $value === 0 ) {
 783                                                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}" );
 784                                                 }
 785                                                 $value = wfTimestamp( TS_MW, $value );
 786                                                 break;
 787                                         case 'user':
 788                                                 if ( !is_array( $value ) ) {
 789                                                         $value = array( $value );
 790                                                 }
 791
 792                                                 foreach ( $value as $key => $val ) {
 793                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 794                                                         if ( is_null( $title ) ) {
 795                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 796                                                         }
 797                                                         $value[$key] = $title->getText();
 798                                                 }
 799
 800                                                 if ( !$multi ) {
 801                                                         $value = $value[0];
 802                                                 }
 803                                                 break;
 804                                         default:
 805                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 806                                 }
 807                         }
 808
 809                         // Throw out duplicates if requested
 810                         if ( is_array( $value ) && !$dupes ) {
 811                                 $value = array_unique( $value );
 812                         }
 813
 814                         // Set a warning if a deprecated parameter has been passed
 815                         if ( $deprecated && $value !== false ) {
 816                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 817                         }
 818                 } else if ( $required ) {
 819                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 820                 }
 821
 822                 return $value;
 823         }
 824
 825         /**
 826          * Return an array of values that were given in a 'a|b|c' notation,
 827          * after it optionally validates them against the list allowed values.
 828          *
 829          * @param $valueName string The name of the parameter (for error
 830          *  reporting)
 831          * @param $value mixed The value being parsed
 832          * @param $allowMultiple bool Can $value contain more than one value
 833          *  separated by '|'?
 834          * @param $allowedValues mixed An array of values to check against. If
 835          *  null, all values are accepted.
 836          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 837          */
 838         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 839                 if ( trim( $value ) === '' && $allowMultiple ) {
 840                         return array();
 841                 }
 842
 843                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 844                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 845                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 846                         self::LIMIT_SML2 : self::LIMIT_SML1;
 847
 848                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 849                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 850                 }
 851
 852                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 853                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 854                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 855                 }
 856
 857                 if ( is_array( $allowedValues ) ) {
 858                         // Check for unknown values
 859                         $unknown = array_diff( $valuesList, $allowedValues );
 860                         if ( count( $unknown ) ) {
 861                                 if ( $allowMultiple ) {
 862                                         $s = count( $unknown ) > 1 ? 's' : '';
 863                                         $vals = implode( ", ", $unknown );
 864                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 865                                 } else {
 866                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 867                                 }
 868                         }
 869                         // Now throw them out
 870                         $valuesList = array_intersect( $valuesList, $allowedValues );
 871                 }
 872
 873                 return $allowMultiple ? $valuesList : $valuesList[0];
 874         }
 875
 876         /**
 877          * Validate the value against the minimum and user/bot maximum limits.
 878          * Prints usage info on failure.
 879          * @param $paramName string Parameter name
 880          * @param $value int Parameter value
 881          * @param $min int|null Minimum value
 882          * @param $max int|null Maximum value for users
 883          * @param $botMax int Maximum value for sysops/bots
 884          * @param $enforceLimits Boolean Whether to enforce (die) if value is outside limits
 885          */
 886         function validateLimit( $paramName, &$value, $min, $max, $botMax = null, $enforceLimits = false ) {
 887                 if ( !is_null( $min ) && $value < $min ) {
 888
 889                         $msg = $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)";
 890                         $this->warnOrDie( $msg, $enforceLimits );
 891                         $value = $min;
 892                 }
 893
 894                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 895                 if ( $this->getMain()->isInternalMode() ) {
 896                         return;
 897                 }
 898
 899                 // Optimization: do not check user's bot status unless really needed -- skips db query
 900                 // assumes $botMax >= $max
 901                 if ( !is_null( $max ) && $value > $max ) {
 902                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 903                                 if ( $value > $botMax ) {
 904                                         $msg = $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops";
 905                                         $this->warnOrDie( $msg, $enforceLimits );
 906                                         $value = $botMax;
 907                                 }
 908                         } else {
 909                                 $msg = $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users";
 910                                 $this->warnOrDie( $msg, $enforceLimits );
 911                                 $value = $max;
 912                         }
 913                 }
 914         }
 915
 916         /**
 917          * Adds a warning to the output, else dies
 918          *
 919          * @param  $msg String Message to show as a warning, or error message if dying
 920          * @param  $enforceLimits Boolean Whether this is an enforce (die)
 921          */
 922         private function warnOrDie( $msg, $enforceLimits = false ) {
 923                 if ( $enforceLimits ) {
 924                         $this->dieUsage( $msg, 'integeroutofrange' );
 925                 } else {
 926                         $this->setWarning( $msg );
 927                 }
 928         }
 929
 930         /**
 931          * Truncate an array to a certain length.
 932          * @param $arr array Array to truncate
 933          * @param $limit int Maximum length
 934          * @return bool True if the array was truncated, false otherwise
 935          */
 936         public static function truncateArray( &$arr, $limit ) {
 937                 $modified = false;
 938                 while ( count( $arr ) > $limit ) {
 939                         array_pop( $arr );
 940                         $modified = true;
 941                 }
 942                 return $modified;
 943         }
 944
 945         /**
 946          * Throw a UsageException, which will (if uncaught) call the main module's
 947          * error handler and die with an error message.
 948          *
 949          * @param $description string One-line human-readable description of the
 950          *   error condition, e.g., "The API requires a valid action parameter"
 951          * @param $errorCode string Brief, arbitrary, stable string to allow easy
 952          *   automated identification of the error, e.g., 'unknown_action'
 953          * @param $httpRespCode int HTTP response code
 954          * @param $extradata array Data to add to the <error> element; array in ApiResult format
 955          */
 956         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
 957                 Profiler::instance()->close();
 958                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
 959         }
 960
 961         /**
 962          * Array that maps message keys to error messages. $1 and friends are replaced.
 963          */
 964         public static $messageMap = array(
 965                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 966                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
 967                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
 968
 969                 // Messages from Title::getUserPermissionsErrors()
 970                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
 971                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
 972                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
 973                 'customcssprotected' => array( 'code' => 'customcssprotected', 'info' => "You're not allowed to edit custom CSS  pages" ),
 974                 'customjsprotected' => array( 'code' => 'customjsprotected', 'info' => "You're not allowed to edit custom JavaScript pages" ),
 975                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
 976                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
 977                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
 978                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
 979                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
 980                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
 981                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
 982                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
 983                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
 984                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
 985                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
 986                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
 987                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
 988
 989                 // Miscellaneous interface messages
 990                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
 991                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
 992                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
 993                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
 994                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
 995                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
 996                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
 997                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
 998                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
 999                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
1000                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
1001                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
1002                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
1003                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
1004                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
1005                 // 'badarticleerror' => shouldn't happen
1006                 // 'badtitletext' => shouldn't happen
1007                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
1008                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
1009                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
1010                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
1011                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
1012                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
1013                 '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." ),
1014                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
1015                 '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" ),
1016                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
1017                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
1018                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
1019                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
1020                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
1021                 '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" ),
1022                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
1023                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
1024                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
1025                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
1026                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
1027                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
1028                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1029                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1030                 'summaryrequired' => array( 'code' => 'summaryrequired', 'info' => 'Summary required' ),
1031
1032                 // API-specific messages
1033                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
1034                 '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" ),
1035                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
1036                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
1037                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
1038                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
1039                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
1040                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
1041                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1042                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
1043                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
1044                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
1045                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
1046                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
1047                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
1048                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
1049                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
1050                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
1051                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
1052                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
1053                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
1054                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
1055                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
1056                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
1057                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
1058                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
1059                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
1060                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
1061                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
1062                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
1063                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
1064                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
1065                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
1066                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
1067                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
1068                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1069                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1070                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
1071                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
1072                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
1073                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
1074                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
1075                 'specialpage-cantexecute' => array( 'code' => 'specialpage-cantexecute', 'info' => "You don't have permission to view the results of this special page" ),
1076
1077                 // ApiEditPage messages
1078                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
1079                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
1080                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
1081                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
1082                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
1083                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
1084                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
1085                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
1086                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
1087                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
1088                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
1089                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
1090                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
1091                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
1092                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
1093
1094                 // uploadMsgs
1095                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
1096                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
1097                 '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' ),
1098                 'copyuploaddisabled' => array( 'code' => 'copyuploaddisabled', 'info' => 'Uploads by URL is not enabled.  Make sure $wgAllowCopyUploads is set to true in LocalSettings.php.' ),
1099
1100                 'filename-tooshort' => array( 'code' => 'filename-tooshort', 'info' => 'The filename is too short' ),
1101                 'illegal-filename' => array( 'code' => 'illegal-filename', 'info' => 'The filename is not allowed' ),
1102                 'filetype-missing' => array( 'code' => 'filetype-missing', 'info' => 'The file is missing an extension' ),
1103         );
1104
1105         /**
1106          * Helper function for readonly errors
1107          */
1108         public function dieReadOnly() {
1109                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
1110                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
1111                         array( 'readonlyreason' => wfReadOnlyReason() ) );
1112         }
1113
1114         /**
1115          * Output the error message related to a certain array
1116          * @param $error (array|string) Element of a getUserPermissionsErrors()-style array
1117          */
1118         public function dieUsageMsg( $error ) {
1119                 # most of the time we send a 1 element, so we might as well send it as
1120                 # a string and make this an array here.
1121                 if( is_string( $error ) ) {
1122                         $error = array( $error );
1123                 }
1124                 $parsed = $this->parseMsg( $error );
1125                 $this->dieUsage( $parsed['info'], $parsed['code'] );
1126         }
1127
1128         /**
1129          * Return the error message related to a certain array
1130          * @param $error array Element of a getUserPermissionsErrors()-style array
1131          * @return array('code' => code, 'info' => info)
1132          */
1133         public function parseMsg( $error ) {
1134                 $key = array_shift( $error );
1135
1136                 // Check whether the error array was nested
1137                 // array( array( <code>, <params> ), array( <another_code>, <params> ) )
1138                 if( is_array( $key ) ){
1139                         $error = $key;
1140                         $key = array_shift( $error );
1141                 }
1142
1143                 if ( isset( self::$messageMap[$key] ) ) {
1144                         return array( 'code' =>
1145                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
1146                                         'info' =>
1147                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
1148                         );
1149                 }
1150
1151                 // If the key isn't present, throw an "unknown error"
1152                 return $this->parseMsg( array( 'unknownerror', $key ) );
1153         }
1154
1155         /**
1156          * Internal code errors should be reported with this method
1157          * @param $method string Method or function name
1158          * @param $message string Error message
1159          */
1160         protected static function dieDebug( $method, $message ) {
1161                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1162         }
1163
1164         /**
1165          * Indicates if this module needs maxlag to be checked
1166          * @return bool
1167          */
1168         public function shouldCheckMaxlag() {
1169                 return true;
1170         }
1171
1172         /**
1173          * Indicates whether this module requires read rights
1174          * @return bool
1175          */
1176         public function isReadMode() {
1177                 return true;
1178         }
1179         /**
1180          * Indicates whether this module requires write mode
1181          * @return bool
1182          */
1183         public function isWriteMode() {
1184                 return false;
1185         }
1186
1187         /**
1188          * Indicates whether this module must be called with a POST request
1189          * @return bool
1190          */
1191         public function mustBePosted() {
1192                 return false;
1193         }
1194
1195         /**
1196          * Returns whether this module requires a Token to execute
1197          * @return bool
1198          */
1199         public function needsToken() {
1200                 return false;
1201         }
1202
1203         /**
1204          * 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
1205          * @return bool
1206          */
1207         public function getTokenSalt() {
1208                 return false;
1209         }
1210
1211         /**
1212          * Gets the user for whom to get the watchlist
1213          *
1214          * @param $params array
1215          * @return User
1216          */
1217         public function getWatchlistUser( $params ) {
1218                 global $wgUser;
1219                 if ( !is_null( $params['owner'] ) && !is_null( $params['token'] ) ) {
1220                         $user = User::newFromName( $params['owner'], false );
1221                         if ( !$user->getId() ) {
1222                                 $this->dieUsage( 'Specified user does not exist', 'bad_wlowner' );
1223                         }
1224                         $token = $user->getOption( 'watchlisttoken' );
1225                         if ( $token == '' || $token != $params['token'] ) {
1226                                 $this->dieUsage( 'Incorrect watchlist token provided -- please set a correct token in Special:Preferences', 'bad_wltoken' );
1227                         }
1228                 } else {
1229                         if ( !$wgUser->isLoggedIn() ) {
1230                                 $this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
1231                         }
1232                         $user = $wgUser;
1233                 }
1234                 return $user;
1235         }
1236
1237         /**
1238          * Returns a list of all possible errors returned by the module
1239          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1240          */
1241         public function getPossibleErrors() {
1242                 $ret = array();
1243
1244                 $params = $this->getFinalParams();
1245                 if ( $params ) {
1246                         foreach ( $params as $paramName => $paramSettings ) {
1247                                 if ( isset( $paramSettings[ApiBase::PARAM_REQUIRED] ) ) {
1248                                         $ret[] = array( 'missingparam', $paramName );
1249                                 }
1250                         }
1251                 }
1252
1253                 if ( $this->mustBePosted() ) {
1254                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1255                 }
1256
1257                 if ( $this->isReadMode() ) {
1258                         $ret[] = array( 'readrequired' );
1259                 }
1260
1261                 if ( $this->isWriteMode() ) {
1262                         $ret[] = array( 'writerequired' );
1263                         $ret[] = array( 'writedisabled' );
1264                 }
1265
1266                 if ( $this->needsToken() ) {
1267                         $ret[] = array( 'missingparam', 'token' );
1268                         $ret[] = array( 'sessionfailure' );
1269                 }
1270
1271                 return $ret;
1272         }
1273
1274         /**
1275          * Parses a list of errors into a standardised format
1276          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1277          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1278          */
1279         public function parseErrors( $errors ) {
1280                 $ret = array();
1281
1282                 foreach ( $errors as $row ) {
1283                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1284                                 $ret[] = $row;
1285                         } else {
1286                                 $ret[] = $this->parseMsg( $row );
1287                         }
1288                 }
1289                 return $ret;
1290         }
1291
1292         /**
1293          * Profiling: total module execution time
1294          */
1295         private $mTimeIn = 0, $mModuleTime = 0;
1296
1297         /**
1298          * Start module profiling
1299          */
1300         public function profileIn() {
1301                 if ( $this->mTimeIn !== 0 ) {
1302                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1303                 }
1304                 $this->mTimeIn = microtime( true );
1305                 wfProfileIn( $this->getModuleProfileName() );
1306         }
1307
1308         /**
1309          * End module profiling
1310          */
1311         public function profileOut() {
1312                 if ( $this->mTimeIn === 0 ) {
1313                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1314                 }
1315                 if ( $this->mDBTimeIn !== 0 ) {
1316                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1317                 }
1318
1319                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1320                 $this->mTimeIn = 0;
1321                 wfProfileOut( $this->getModuleProfileName() );
1322         }
1323
1324         /**
1325          * When modules crash, sometimes it is needed to do a profileOut() regardless
1326          * of the profiling state the module was in. This method does such cleanup.
1327          */
1328         public function safeProfileOut() {
1329                 if ( $this->mTimeIn !== 0 ) {
1330                         if ( $this->mDBTimeIn !== 0 ) {
1331                                 $this->profileDBOut();
1332                         }
1333                         $this->profileOut();
1334                 }
1335         }
1336
1337         /**
1338          * Total time the module was executed
1339          * @return float
1340          */
1341         public function getProfileTime() {
1342                 if ( $this->mTimeIn !== 0 ) {
1343                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1344                 }
1345                 return $this->mModuleTime;
1346         }
1347
1348         /**
1349          * Profiling: database execution time
1350          */
1351         private $mDBTimeIn = 0, $mDBTime = 0;
1352
1353         /**
1354          * Start module profiling
1355          */
1356         public function profileDBIn() {
1357                 if ( $this->mTimeIn === 0 ) {
1358                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1359                 }
1360                 if ( $this->mDBTimeIn !== 0 ) {
1361                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1362                 }
1363                 $this->mDBTimeIn = microtime( true );
1364                 wfProfileIn( $this->getModuleProfileName( true ) );
1365         }
1366
1367         /**
1368          * End database profiling
1369          */
1370         public function profileDBOut() {
1371                 if ( $this->mTimeIn === 0 ) {
1372                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1373                 }
1374                 if ( $this->mDBTimeIn === 0 ) {
1375                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1376                 }
1377
1378                 $time = microtime( true ) - $this->mDBTimeIn;
1379                 $this->mDBTimeIn = 0;
1380
1381                 $this->mDBTime += $time;
1382                 $this->getMain()->mDBTime += $time;
1383                 wfProfileOut( $this->getModuleProfileName( true ) );
1384         }
1385
1386         /**
1387          * Total time the module used the database
1388          * @return float
1389          */
1390         public function getProfileDBTime() {
1391                 if ( $this->mDBTimeIn !== 0 ) {
1392                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1393                 }
1394                 return $this->mDBTime;
1395         }
1396
1397         /**
1398          * Debugging function that prints a value and an optional backtrace
1399          * @param $value mixed Value to print
1400          * @param $name string Description of the printed value
1401          * @param $backtrace bool If true, print a backtrace
1402          */
1403         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1404                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1405                 var_export( $value );
1406                 if ( $backtrace ) {
1407                         print "\n" . wfBacktrace();
1408                 }
1409                 print "\n</pre>\n";
1410         }
1411
1412         /**
1413          * Returns a string that identifies the version of this class.
1414          * @return string
1415          */
1416         public static function getBaseVersion() {
1417                 return __CLASS__ . ': $Id$';
1418         }
1419 }