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