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          * Die if more than one of a certain set of parameters is set and not false.
 586          *
 587          * @param $params array
 588          */
 589         public function requireMaxOneParameter( $params ) {
 590                 $required = func_get_args();
 591                 array_shift( $required );
 592
 593                 $intersection = array_intersect( array_keys( array_filter( $params,
 594                                 array( $this, "parameterNotEmpty" ) ) ), $required );
 595
 596                 if ( count( $intersection ) > 1 ) {
 597                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 598                 }
 599         }
 600
 601         /**
 602          * Generates the possible error requireMaxOneParameter() can die with
 603          *
 604          * @param $params array
 605          * @return array
 606          */
 607         public function getRequireMaxOneParameterErrorMessages( $params ) {
 608                 $p = $this->getModulePrefix();
 609                 $params = implode( ", {$p}", $params );
 610
 611                 return array(
 612                         array( 'code' => "{$p}invalidparammix", 'info' => "The parameters {$p}{$params} can not be used together" )
 613                 );
 614         }
 615
 616         /**
 617          * Callback function used in requireOnlyOneParameter to check whether reequired parameters are set
 618          *
 619          * @param  $x object Parameter to check is not null/false
 620          * @return bool
 621          */
 622         private function parameterNotEmpty( $x ) {
 623                 return !is_null( $x ) && $x !== false;
 624         }
 625
 626         /**
 627          * @deprecated since 1.17 use MWNamespace::getValidNamespaces()
 628          */
 629         public static function getValidNamespaces() {
 630                 return MWNamespace::getValidNamespaces();
 631         }
 632
 633         /**
 634          * Return true if we're to watch the page, false if not, null if no change.
 635          * @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 636          * @param $titleObj Title the page under consideration
 637          * @param $userOption String The user option to consider when $watchlist=preferences.
 638          *      If not set will magically default to either watchdefault or watchcreations
 639          * @return bool
 640          */
 641         protected function getWatchlistValue ( $watchlist, $titleObj, $userOption = null ) {
 642
 643                 $userWatching = $titleObj->userIsWatching();
 644
 645                 global $wgUser;
 646                 switch ( $watchlist ) {
 647                         case 'watch':
 648                                 return true;
 649
 650                         case 'unwatch':
 651                                 return false;
 652
 653                         case 'preferences':
 654                                 # If the user is already watching, don't bother checking
 655                                 if ( $userWatching ) {
 656                                         return true;
 657                                 }
 658                                 # If no user option was passed, use watchdefault or watchcreation
 659                                 if ( is_null( $userOption ) ) {
 660                                         $userOption = $titleObj->exists()
 661                                                 ? 'watchdefault' : 'watchcreations';
 662                                 }
 663                                 # Watch the article based on the user preference
 664                                 return (bool)$wgUser->getOption( $userOption );
 665
 666                         case 'nochange':
 667                                 return $userWatching;
 668
 669                         default:
 670                                 return $userWatching;
 671                 }
 672         }
 673
 674         /**
 675          * Set a watch (or unwatch) based the based on a watchlist parameter.
 676          * @param $watch String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 677          * @param $titleObj Title the article's title to change
 678          * @param $userOption String The user option to consider when $watch=preferences
 679          */
 680         protected function setWatch( $watch, $titleObj, $userOption = null ) {
 681                 $value = $this->getWatchlistValue( $watch, $titleObj, $userOption );
 682                 if ( $value === null ) {
 683                         return;
 684                 }
 685
 686                 global $wgUser;
 687                 if ( $value ) {
 688                         WatchAction::doWatch( $titleObj, $wgUser );
 689                 } else {
 690                         WatchAction::doUnwatch( $titleObj, $wgUser );
 691                 }
 692         }
 693
 694         /**
 695          * Using the settings determine the value for the given parameter
 696          *
 697          * @param $paramName String: parameter name
 698          * @param $paramSettings Mixed: default value or an array of settings
 699          *  using PARAM_* constants.
 700          * @param $parseLimit Boolean: parse limit?
 701          * @return mixed Parameter value
 702          */
 703         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 704                 // Some classes may decide to change parameter names
 705                 $encParamName = $this->encodeParamName( $paramName );
 706
 707                 if ( !is_array( $paramSettings ) ) {
 708                         $default = $paramSettings;
 709                         $multi = false;
 710                         $type = gettype( $paramSettings );
 711                         $dupes = false;
 712                         $deprecated = false;
 713                         $required = false;
 714                 } else {
 715                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 716                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 717                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 718                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 719                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 720                         $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ? $paramSettings[self::PARAM_REQUIRED] : false;
 721
 722                         // When type is not given, and no choices, the type is the same as $default
 723                         if ( !isset( $type ) ) {
 724                                 if ( isset( $default ) ) {
 725                                         $type = gettype( $default );
 726                                 } else {
 727                                         $type = 'NULL'; // allow everything
 728                                 }
 729                         }
 730                 }
 731
 732                 if ( $type == 'boolean' ) {
 733                         if ( isset( $default ) && $default !== false ) {
 734                                 // Having a default value of anything other than 'false' is pointless
 735                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 736                         }
 737
 738                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 739                 } else {
 740                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 741
 742                         if ( isset( $value ) && $type == 'namespace' ) {
 743                                 $type = MWNamespace::getValidNamespaces();
 744                         }
 745                 }
 746
 747                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 748                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 749                 }
 750
 751                 // More validation only when choices were not given
 752                 // choices were validated in parseMultiValue()
 753                 if ( isset( $value ) ) {
 754                         if ( !is_array( $type ) ) {
 755                                 switch ( $type ) {
 756                                         case 'NULL': // nothing to do
 757                                                 break;
 758                                         case 'string':
 759                                                 if ( $required && $value === '' ) {
 760                                                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 761                                                 }
 762
 763                                                 break;
 764                                         case 'integer': // Force everything using intval() and optionally validate limits
 765                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 766                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 767                                                 $enforceLimits = isset ( $paramSettings[self::PARAM_RANGE_ENFORCE] )
 768                                                                 ? $paramSettings[self::PARAM_RANGE_ENFORCE] : false;
 769
 770                                                 if ( is_array( $value ) ) {
 771                                                         $value = array_map( 'intval', $value );
 772                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 773                                                                 foreach ( $value as &$v ) {
 774                                                                         $this->validateLimit( $paramName, $v, $min, $max, null, $enforceLimits );
 775                                                                 }
 776                                                         }
 777                                                 } else {
 778                                                         $value = intval( $value );
 779                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 780                                                                 $this->validateLimit( $paramName, $value, $min, $max, null, $enforceLimits );
 781                                                         }
 782                                                 }
 783                                                 break;
 784                                         case 'limit':
 785                                                 if ( !$parseLimit ) {
 786                                                         // Don't do any validation whatsoever
 787                                                         break;
 788                                                 }
 789                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 790                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 791                                                 }
 792                                                 if ( $multi ) {
 793                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 794                                                 }
 795                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 796                                                 if ( $value == 'max' ) {
 797                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 798                                                         $this->getResult()->setParsedLimit( $this->getModuleName(), $value );
 799                                                 } else {
 800                                                         $value = intval( $value );
 801                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 802                                                 }
 803                                                 break;
 804                                         case 'boolean':
 805                                                 if ( $multi ) {
 806                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 807                                                 }
 808                                                 break;
 809                                         case 'timestamp':
 810                                                 if ( is_array( $value ) ) {
 811                                                         foreach ( $value as $key => $val ) {
 812                                                                 $value[$key] = $this->validateTimestamp( $val, $encParamName );
 813                                                         }
 814                                                 } else {
 815                                                         $value = $this->validateTimestamp( $value, $encParamName );
 816                                                 }
 817                                                 break;
 818                                         case 'user':
 819                                                 if ( !is_array( $value ) ) {
 820                                                         $value = array( $value );
 821                                                 }
 822
 823                                                 foreach ( $value as $key => $val ) {
 824                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 825                                                         if ( is_null( $title ) ) {
 826                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 827                                                         }
 828                                                         $value[$key] = $title->getText();
 829                                                 }
 830
 831                                                 if ( !$multi ) {
 832                                                         $value = $value[0];
 833                                                 }
 834                                                 break;
 835                                         default:
 836                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 837                                 }
 838                         }
 839
 840                         // Throw out duplicates if requested
 841                         if ( is_array( $value ) && !$dupes ) {
 842                                 $value = array_unique( $value );
 843                         }
 844
 845                         // Set a warning if a deprecated parameter has been passed
 846                         if ( $deprecated && $value !== false ) {
 847                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 848                         }
 849                 } else if ( $required ) {
 850                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 851                 }
 852
 853                 return $value;
 854         }
 855
 856         /**
 857          * Return an array of values that were given in a 'a|b|c' notation,
 858          * after it optionally validates them against the list allowed values.
 859          *
 860          * @param $valueName string The name of the parameter (for error
 861          *  reporting)
 862          * @param $value mixed The value being parsed
 863          * @param $allowMultiple bool Can $value contain more than one value
 864          *  separated by '|'?
 865          * @param $allowedValues mixed An array of values to check against. If
 866          *  null, all values are accepted.
 867          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 868          */
 869         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 870                 if ( trim( $value ) === '' && $allowMultiple ) {
 871                         return array();
 872                 }
 873
 874                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 875                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 876                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 877                         self::LIMIT_SML2 : self::LIMIT_SML1;
 878
 879                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 880                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 881                 }
 882
 883                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 884                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 885                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 886                 }
 887
 888                 if ( is_array( $allowedValues ) ) {
 889                         // Check for unknown values
 890                         $unknown = array_diff( $valuesList, $allowedValues );
 891                         if ( count( $unknown ) ) {
 892                                 if ( $allowMultiple ) {
 893                                         $s = count( $unknown ) > 1 ? 's' : '';
 894                                         $vals = implode( ", ", $unknown );
 895                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 896                                 } else {
 897                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 898                                 }
 899                         }
 900                         // Now throw them out
 901                         $valuesList = array_intersect( $valuesList, $allowedValues );
 902                 }
 903
 904                 return $allowMultiple ? $valuesList : $valuesList[0];
 905         }
 906
 907         /**
 908          * Validate the value against the minimum and user/bot maximum limits.
 909          * Prints usage info on failure.
 910          * @param $paramName string Parameter name
 911          * @param $value int Parameter value
 912          * @param $min int|null Minimum value
 913          * @param $max int|null Maximum value for users
 914          * @param $botMax int Maximum value for sysops/bots
 915          * @param $enforceLimits Boolean Whether to enforce (die) if value is outside limits
 916          */
 917         function validateLimit( $paramName, &$value, $min, $max, $botMax = null, $enforceLimits = false ) {
 918                 if ( !is_null( $min ) && $value < $min ) {
 919
 920                         $msg = $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)";
 921                         $this->warnOrDie( $msg, $enforceLimits );
 922                         $value = $min;
 923                 }
 924
 925                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 926                 if ( $this->getMain()->isInternalMode() ) {
 927                         return;
 928                 }
 929
 930                 // Optimization: do not check user's bot status unless really needed -- skips db query
 931                 // assumes $botMax >= $max
 932                 if ( !is_null( $max ) && $value > $max ) {
 933                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 934                                 if ( $value > $botMax ) {
 935                                         $msg = $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops";
 936                                         $this->warnOrDie( $msg, $enforceLimits );
 937                                         $value = $botMax;
 938                                 }
 939                         } else {
 940                                 $msg = $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users";
 941                                 $this->warnOrDie( $msg, $enforceLimits );
 942                                 $value = $max;
 943                         }
 944                 }
 945         }
 946
 947         /**
 948          * @param $value string
 949          * @param $paramName string
 950          * @return string
 951          */
 952         function validateTimestamp( $value, $paramName ) {
 953                 $value = wfTimestamp( TS_UNIX, $value );
 954                 if ( $value === 0 ) {
 955                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $paramName", "badtimestamp_{$paramName}" );
 956                 }
 957                 return wfTimestamp( TS_MW, $value );
 958         }
 959
 960         /**
 961          * Adds a warning to the output, else dies
 962          *
 963          * @param  $msg String Message to show as a warning, or error message if dying
 964          * @param  $enforceLimits Boolean Whether this is an enforce (die)
 965          */
 966         private function warnOrDie( $msg, $enforceLimits = false ) {
 967                 if ( $enforceLimits ) {
 968                         $this->dieUsage( $msg, 'integeroutofrange' );
 969                 } else {
 970                         $this->setWarning( $msg );
 971                 }
 972         }
 973
 974         /**
 975          * Truncate an array to a certain length.
 976          * @param $arr array Array to truncate
 977          * @param $limit int Maximum length
 978          * @return bool True if the array was truncated, false otherwise
 979          */
 980         public static function truncateArray( &$arr, $limit ) {
 981                 $modified = false;
 982                 while ( count( $arr ) > $limit ) {
 983                         array_pop( $arr );
 984                         $modified = true;
 985                 }
 986                 return $modified;
 987         }
 988
 989         /**
 990          * Throw a UsageException, which will (if uncaught) call the main module's
 991          * error handler and die with an error message.
 992          *
 993          * @param $description string One-line human-readable description of the
 994          *   error condition, e.g., "The API requires a valid action parameter"
 995          * @param $errorCode string Brief, arbitrary, stable string to allow easy
 996          *   automated identification of the error, e.g., 'unknown_action'
 997          * @param $httpRespCode int HTTP response code
 998          * @param $extradata array Data to add to the <error> element; array in ApiResult format
 999          */
1000         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
1001                 Profiler::instance()->close();
1002                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
1003         }
1004
1005         /**
1006          * Array that maps message keys to error messages. $1 and friends are replaced.
1007          */
1008         public static $messageMap = array(
1009                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
1010                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
1011                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
1012
1013                 // Messages from Title::getUserPermissionsErrors()
1014                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
1015                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
1016                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
1017                 'customcssprotected' => array( 'code' => 'customcssprotected', 'info' => "You're not allowed to edit custom CSS pages" ),
1018                 'customjsprotected' => array( 'code' => 'customjsprotected', 'info' => "You're not allowed to edit custom JavaScript pages" ),
1019                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
1020                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
1021                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
1022                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
1023                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
1024                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
1025                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
1026                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
1027                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
1028                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
1029                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
1030                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
1031                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
1032
1033                 // Miscellaneous interface messages
1034                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
1035                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
1036                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
1037                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
1038                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
1039                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
1040                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
1041                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
1042                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
1043                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
1044                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
1045                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
1046                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
1047                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
1048                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
1049                 // 'badarticleerror' => shouldn't happen
1050                 // 'badtitletext' => shouldn't happen
1051                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
1052                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
1053                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
1054                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
1055                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
1056                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
1057                 '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." ),
1058                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
1059                 '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" ),
1060                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
1061                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
1062                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
1063                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
1064                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
1065                 '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" ),
1066                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
1067                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
1068                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
1069                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
1070                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
1071                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
1072                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1073                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1074                 'summaryrequired' => array( 'code' => 'summaryrequired', 'info' => 'Summary required' ),
1075
1076                 // API-specific messages
1077                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
1078                 '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" ),
1079                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
1080                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
1081                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
1082                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
1083                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
1084                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
1085                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1086                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
1087                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
1088                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
1089                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
1090                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
1091                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
1092                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
1093                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
1094                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
1095                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
1096                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
1097                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
1098                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
1099                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
1100                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
1101                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
1102                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
1103                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
1104                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
1105                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
1106                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
1107                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
1108                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
1109                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
1110                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
1111                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
1112                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1113                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1114                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
1115                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
1116                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
1117                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
1118                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
1119                 'specialpage-cantexecute' => array( 'code' => 'specialpage-cantexecute', 'info' => "You don't have permission to view the results of this special page" ),
1120
1121                 // ApiEditPage messages
1122                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
1123                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
1124                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
1125                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
1126                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
1127                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
1128                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
1129                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
1130                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
1131                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
1132                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
1133                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
1134                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
1135                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
1136                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
1137
1138                 // uploadMsgs
1139                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
1140                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
1141                 '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' ),
1142                 'copyuploaddisabled' => array( 'code' => 'copyuploaddisabled', 'info' => 'Uploads by URL is not enabled.  Make sure $wgAllowCopyUploads is set to true in LocalSettings.php.' ),
1143
1144                 'filename-tooshort' => array( 'code' => 'filename-tooshort', 'info' => 'The filename is too short' ),
1145                 'illegal-filename' => array( 'code' => 'illegal-filename', 'info' => 'The filename is not allowed' ),
1146                 'filetype-missing' => array( 'code' => 'filetype-missing', 'info' => 'The file is missing an extension' ),
1147         );
1148
1149         /**
1150          * Helper function for readonly errors
1151          */
1152         public function dieReadOnly() {
1153                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
1154                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
1155                         array( 'readonlyreason' => wfReadOnlyReason() ) );
1156         }
1157
1158         /**
1159          * Output the error message related to a certain array
1160          * @param $error (array|string) Element of a getUserPermissionsErrors()-style array
1161          */
1162         public function dieUsageMsg( $error ) {
1163                 # most of the time we send a 1 element, so we might as well send it as
1164                 # a string and make this an array here.
1165                 if( is_string( $error ) ) {
1166                         $error = array( $error );
1167                 }
1168                 $parsed = $this->parseMsg( $error );
1169                 $this->dieUsage( $parsed['info'], $parsed['code'] );
1170         }
1171
1172         /**
1173          * Return the error message related to a certain array
1174          * @param $error array Element of a getUserPermissionsErrors()-style array
1175          * @return array('code' => code, 'info' => info)
1176          */
1177         public function parseMsg( $error ) {
1178                 $key = array_shift( $error );
1179
1180                 // Check whether the error array was nested
1181                 // array( array( <code>, <params> ), array( <another_code>, <params> ) )
1182                 if( is_array( $key ) ){
1183                         $error = $key;
1184                         $key = array_shift( $error );
1185                 }
1186
1187                 if ( isset( self::$messageMap[$key] ) ) {
1188                         return array( 'code' =>
1189                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
1190                                         'info' =>
1191                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
1192                         );
1193                 }
1194
1195                 // If the key isn't present, throw an "unknown error"
1196                 return $this->parseMsg( array( 'unknownerror', $key ) );
1197         }
1198
1199         /**
1200          * Internal code errors should be reported with this method
1201          * @param $method string Method or function name
1202          * @param $message string Error message
1203          */
1204         protected static function dieDebug( $method, $message ) {
1205                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1206         }
1207
1208         /**
1209          * Indicates if this module needs maxlag to be checked
1210          * @return bool
1211          */
1212         public function shouldCheckMaxlag() {
1213                 return true;
1214         }
1215
1216         /**
1217          * Indicates whether this module requires read rights
1218          * @return bool
1219          */
1220         public function isReadMode() {
1221                 return true;
1222         }
1223         /**
1224          * Indicates whether this module requires write mode
1225          * @return bool
1226          */
1227         public function isWriteMode() {
1228                 return false;
1229         }
1230
1231         /**
1232          * Indicates whether this module must be called with a POST request
1233          * @return bool
1234          */
1235         public function mustBePosted() {
1236                 return false;
1237         }
1238
1239         /**
1240          * Returns whether this module requires a Token to execute
1241          * @return bool
1242          */
1243         public function needsToken() {
1244                 return false;
1245         }
1246
1247         /**
1248          * 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
1249          * @return bool
1250          */
1251         public function getTokenSalt() {
1252                 return false;
1253         }
1254
1255         /**
1256          * Gets the user for whom to get the watchlist
1257          *
1258          * @param $params array
1259          * @return User
1260          */
1261         public function getWatchlistUser( $params ) {
1262                 global $wgUser;
1263                 if ( !is_null( $params['owner'] ) && !is_null( $params['token'] ) ) {
1264                         $user = User::newFromName( $params['owner'], false );
1265                         if ( !$user->getId() ) {
1266                                 $this->dieUsage( 'Specified user does not exist', 'bad_wlowner' );
1267                         }
1268                         $token = $user->getOption( 'watchlisttoken' );
1269                         if ( $token == '' || $token != $params['token'] ) {
1270                                 $this->dieUsage( 'Incorrect watchlist token provided -- please set a correct token in Special:Preferences', 'bad_wltoken' );
1271                         }
1272                 } else {
1273                         if ( !$wgUser->isLoggedIn() ) {
1274                                 $this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
1275                         }
1276                         $user = $wgUser;
1277                 }
1278                 return $user;
1279         }
1280
1281         /**
1282          * Returns a list of all possible errors returned by the module
1283          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1284          */
1285         public function getPossibleErrors() {
1286                 $ret = array();
1287
1288                 $params = $this->getFinalParams();
1289                 if ( $params ) {
1290                         foreach ( $params as $paramName => $paramSettings ) {
1291                                 if ( isset( $paramSettings[ApiBase::PARAM_REQUIRED] ) ) {
1292                                         $ret[] = array( 'missingparam', $paramName );
1293                                 }
1294                         }
1295                 }
1296
1297                 if ( $this->mustBePosted() ) {
1298                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1299                 }
1300
1301                 if ( $this->isReadMode() ) {
1302                         $ret[] = array( 'readrequired' );
1303                 }
1304
1305                 if ( $this->isWriteMode() ) {
1306                         $ret[] = array( 'writerequired' );
1307                         $ret[] = array( 'writedisabled' );
1308                 }
1309
1310                 if ( $this->needsToken() ) {
1311                         $ret[] = array( 'missingparam', 'token' );
1312                         $ret[] = array( 'sessionfailure' );
1313                 }
1314
1315                 return $ret;
1316         }
1317
1318         /**
1319          * Parses a list of errors into a standardised format
1320          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1321          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1322          */
1323         public function parseErrors( $errors ) {
1324                 $ret = array();
1325
1326                 foreach ( $errors as $row ) {
1327                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1328                                 $ret[] = $row;
1329                         } else {
1330                                 $ret[] = $this->parseMsg( $row );
1331                         }
1332                 }
1333                 return $ret;
1334         }
1335
1336         /**
1337          * Profiling: total module execution time
1338          */
1339         private $mTimeIn = 0, $mModuleTime = 0;
1340
1341         /**
1342          * Start module profiling
1343          */
1344         public function profileIn() {
1345                 if ( $this->mTimeIn !== 0 ) {
1346                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1347                 }
1348                 $this->mTimeIn = microtime( true );
1349                 wfProfileIn( $this->getModuleProfileName() );
1350         }
1351
1352         /**
1353          * End module profiling
1354          */
1355         public function profileOut() {
1356                 if ( $this->mTimeIn === 0 ) {
1357                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1358                 }
1359                 if ( $this->mDBTimeIn !== 0 ) {
1360                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1361                 }
1362
1363                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1364                 $this->mTimeIn = 0;
1365                 wfProfileOut( $this->getModuleProfileName() );
1366         }
1367
1368         /**
1369          * When modules crash, sometimes it is needed to do a profileOut() regardless
1370          * of the profiling state the module was in. This method does such cleanup.
1371          */
1372         public function safeProfileOut() {
1373                 if ( $this->mTimeIn !== 0 ) {
1374                         if ( $this->mDBTimeIn !== 0 ) {
1375                                 $this->profileDBOut();
1376                         }
1377                         $this->profileOut();
1378                 }
1379         }
1380
1381         /**
1382          * Total time the module was executed
1383          * @return float
1384          */
1385         public function getProfileTime() {
1386                 if ( $this->mTimeIn !== 0 ) {
1387                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1388                 }
1389                 return $this->mModuleTime;
1390         }
1391
1392         /**
1393          * Profiling: database execution time
1394          */
1395         private $mDBTimeIn = 0, $mDBTime = 0;
1396
1397         /**
1398          * Start module profiling
1399          */
1400         public function profileDBIn() {
1401                 if ( $this->mTimeIn === 0 ) {
1402                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1403                 }
1404                 if ( $this->mDBTimeIn !== 0 ) {
1405                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1406                 }
1407                 $this->mDBTimeIn = microtime( true );
1408                 wfProfileIn( $this->getModuleProfileName( true ) );
1409         }
1410
1411         /**
1412          * End database profiling
1413          */
1414         public function profileDBOut() {
1415                 if ( $this->mTimeIn === 0 ) {
1416                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1417                 }
1418                 if ( $this->mDBTimeIn === 0 ) {
1419                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1420                 }
1421
1422                 $time = microtime( true ) - $this->mDBTimeIn;
1423                 $this->mDBTimeIn = 0;
1424
1425                 $this->mDBTime += $time;
1426                 $this->getMain()->mDBTime += $time;
1427                 wfProfileOut( $this->getModuleProfileName( true ) );
1428         }
1429
1430         /**
1431          * Total time the module used the database
1432          * @return float
1433          */
1434         public function getProfileDBTime() {
1435                 if ( $this->mDBTimeIn !== 0 ) {
1436                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1437                 }
1438                 return $this->mDBTime;
1439         }
1440
1441         /**
1442          * Debugging function that prints a value and an optional backtrace
1443          * @param $value mixed Value to print
1444          * @param $name string Description of the printed value
1445          * @param $backtrace bool If true, print a backtrace
1446          */
1447         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1448                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1449                 var_export( $value );
1450                 if ( $backtrace ) {
1451                         print "\n" . wfBacktrace();
1452                 }
1453                 print "\n</pre>\n";
1454         }
1455
1456         /**
1457          * Returns a string that identifies the version of this class.
1458          * @return string
1459          */
1460         public static function getBaseVersion() {
1461                 return __CLASS__ . ': $Id$';
1462         }
1463 }