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          * Create a new RequestContext object to use e.g. for calls to other parts
 178          * the software.
 179          * The object will have the WebRequest and the User object set to the ones
 180          * used in this instance.
 181          *
 182          * @return RequestContext
 183          */
 184         public function createContext() {
 185                 global $wgUser;
 186
 187                 $context = new RequestContext;
 188                 $context->setRequest( $this->getMain()->getRequest() );
 189                 $context->setUser( $wgUser ); /// @todo FIXME: we should store the User object
 190
 191                 return $context;
 192         }
 193
 194         /**
 195          * Set warning section for this module. Users should monitor this
 196          * section to notice any changes in API. Multiple calls to this
 197          * function will result in the warning messages being separated by
 198          * newlines
 199          * @param $warning string Warning message
 200          */
 201         public function setWarning( $warning ) {
 202                 $result = $this->getResult();
 203                 $data = $result->getData();
 204                 if ( isset( $data['warnings'][$this->getModuleName()] ) ) {
 205                         // Don't add duplicate warnings
 206                         $warn_regex = preg_quote( $warning, '/' );
 207                         if ( preg_match( "/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*'] ) ) {
 208                                 return;
 209                         }
 210                         $oldwarning = $data['warnings'][$this->getModuleName()]['*'];
 211                         // If there is a warning already, append it to the existing one
 212                         $warning = "$oldwarning\n$warning";
 213                         $result->unsetValue( 'warnings', $this->getModuleName() );
 214                 }
 215                 $msg = array();
 216                 ApiResult::setContent( $msg, $warning );
 217                 $result->disableSizeCheck();
 218                 $result->addValue( 'warnings', $this->getModuleName(), $msg );
 219                 $result->enableSizeCheck();
 220         }
 221
 222         /**
 223          * If the module may only be used with a certain format module,
 224          * it should override this method to return an instance of that formatter.
 225          * A value of null means the default format will be used.
 226          * @return mixed instance of a derived class of ApiFormatBase, or null
 227          */
 228         public function getCustomPrinter() {
 229                 return null;
 230         }
 231
 232         /**
 233          * Generates help message for this module, or false if there is no description
 234          * @return mixed string or false
 235          */
 236         public function makeHelpMsg() {
 237                 static $lnPrfx = "\n  ";
 238
 239                 $msg = $this->getDescription();
 240
 241                 if ( $msg !== false ) {
 242
 243                         if ( !is_array( $msg ) ) {
 244                                 $msg = array(
 245                                         $msg
 246                                 );
 247                         }
 248                         $msg = $lnPrfx . implode( $lnPrfx, $msg ) . "\n";
 249
 250                         if ( $this->isReadMode() ) {
 251                                 $msg .= "\nThis module requires read rights";
 252                         }
 253                         if ( $this->isWriteMode() ) {
 254                                 $msg .= "\nThis module requires write rights";
 255                         }
 256                         if ( $this->mustBePosted() ) {
 257                                 $msg .= "\nThis module only accepts POST requests";
 258                         }
 259                         if ( $this->isReadMode() || $this->isWriteMode() ||
 260                                         $this->mustBePosted() )
 261                         {
 262                                 $msg .= "\n";
 263                         }
 264
 265                         // Parameters
 266                         $paramsMsg = $this->makeHelpMsgParameters();
 267                         if ( $paramsMsg !== false ) {
 268                                 $msg .= "Parameters:\n$paramsMsg";
 269                         }
 270
 271                         // Examples
 272                         $examples = $this->getExamples();
 273                         if ( $examples !== false ) {
 274                                 if ( !is_array( $examples ) ) {
 275                                         $examples = array(
 276                                                 $examples
 277                                         );
 278                                 }
 279
 280                                 if ( count( $examples ) > 0 ) {
 281                                         $msg .= 'Example' . ( count( $examples ) > 1 ? 's' : '' ) . ":\n  ";
 282                                         $msg .= implode( $lnPrfx, $examples ) . "\n";
 283                                 }
 284                         }
 285
 286                         if ( $this->getMain()->getShowVersions() ) {
 287                                 $versions = $this->getVersion();
 288                                 $pattern = '/(\$.*) ([0-9a-z_]+\.php) (.*\$)/i';
 289                                 $callback = array( $this, 'makeHelpMsg_callback' );
 290
 291                                 if ( is_array( $versions ) ) {
 292                                         foreach ( $versions as &$v ) {
 293                                                 $v = preg_replace_callback( $pattern, $callback, $v );
 294                                         }
 295                                         $versions = implode( "\n  ", $versions );
 296                                 } else {
 297                                         $versions = preg_replace_callback( $pattern, $callback, $versions );
 298                                 }
 299
 300                                 $msg .= "Version:\n  $versions\n";
 301                         }
 302                 }
 303
 304                 return $msg;
 305         }
 306
 307         /**
 308          * Generates the parameter descriptions for this module, to be displayed in the
 309          * module's help.
 310          * @return string or false
 311          */
 312         public function makeHelpMsgParameters() {
 313                 $params = $this->getFinalParams();
 314                 if ( $params ) {
 315
 316                         $paramsDescription = $this->getFinalParamDescription();
 317                         $msg = '';
 318                         $paramPrefix = "\n" . str_repeat( ' ', 24 );
 319                         $descWordwrap = "\n" . str_repeat( ' ', 28 );
 320                         foreach ( $params as $paramName => $paramSettings ) {
 321                                 $desc = isset( $paramsDescription[$paramName] ) ? $paramsDescription[$paramName] : '';
 322                                 if ( is_array( $desc ) ) {
 323                                         $desc = implode( $paramPrefix, $desc );
 324                                 }
 325
 326                                 if ( !is_array( $paramSettings ) ) {
 327                                         $paramSettings = array(
 328                                                 self::PARAM_DFLT => $paramSettings,
 329                                         );
 330                                 }
 331
 332                                 $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ?
 333                                         $paramSettings[self::PARAM_DEPRECATED] : false;
 334                                 if ( $deprecated ) {
 335                                         $desc = "DEPRECATED! $desc";
 336                                 }
 337
 338                                 $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ?
 339                                         $paramSettings[self::PARAM_REQUIRED] : false;
 340                                 if ( $required ) {
 341                                         $desc .= $paramPrefix . "This parameter is required";
 342                                 }
 343
 344                                 $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 345                                 if ( isset( $type ) ) {
 346                                         if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 347                                                 $prompt = 'Values (separate with \'|\'): ';
 348                                         } else {
 349                                                 $prompt = 'One value: ';
 350                                         }
 351
 352                                         if ( is_array( $type ) ) {
 353                                                 $choices = array();
 354                                                 $nothingPrompt = false;
 355                                                 foreach ( $type as $t ) {
 356                                                         if ( $t === '' ) {
 357                                                                 $nothingPrompt = 'Can be empty, or ';
 358                                                         } else {
 359                                                                 $choices[] =  $t;
 360                                                         }
 361                                                 }
 362                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt;
 363                                                 $choicesstring = implode( ', ', $choices );
 364                                                 $desc .= wordwrap( $choicesstring, 100, $descWordwrap );
 365                                         } else {
 366                                                 switch ( $type ) {
 367                                                         case 'namespace':
 368                                                                 // Special handling because namespaces are type-limited, yet they are not given
 369                                                                 $desc .= $paramPrefix . $prompt;
 370                                                                 $desc .= wordwrap( implode( ', ', MWNamespace::getValidNamespaces() ),
 371                                                                         100, $descWordwrap );
 372                                                                 break;
 373                                                         case 'limit':
 374                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]}";
 375                                                                 if ( isset( $paramSettings[self::PARAM_MAX2] ) ) {
 376                                                                         $desc .= " ({$paramSettings[self::PARAM_MAX2]} for bots)";
 377                                                                 }
 378                                                                 $desc .= ' allowed';
 379                                                                 break;
 380                                                         case 'integer':
 381                                                                 $hasMin = isset( $paramSettings[self::PARAM_MIN] );
 382                                                                 $hasMax = isset( $paramSettings[self::PARAM_MAX] );
 383                                                                 if ( $hasMin || $hasMax ) {
 384                                                                         if ( !$hasMax ) {
 385                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self::PARAM_MIN]}";
 386                                                                         } elseif ( !$hasMin ) {
 387                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self::PARAM_MAX]}";
 388                                                                         } else {
 389                                                                                 $intRangeStr = "The value must be between {$paramSettings[self::PARAM_MIN]} and {$paramSettings[self::PARAM_MAX]}";
 390                                                                         }
 391
 392                                                                         $desc .= $paramPrefix . $intRangeStr;
 393                                                                 }
 394                                                                 break;
 395                                                 }
 396
 397                                                 if ( isset( $paramSettings[self::PARAM_ISMULTI] ) ) {
 398                                                         $isArray = is_array( $paramSettings[self::PARAM_TYPE] );
 399
 400                                                         if ( !$isArray
 401                                                                         || $isArray && count( $paramSettings[self::PARAM_TYPE] ) > self::LIMIT_SML1 ) {
 402                                                                 $desc .= $paramPrefix . "Maximum number of values " .
 403                                                                         self::LIMIT_SML1 . " (" . self::LIMIT_SML2 . " for bots)";
 404                                                         }
 405                                                 }
 406                                         }
 407                                 }
 408
 409                                 $default = is_array( $paramSettings )
 410                                                 ? ( isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null )
 411                                                 : $paramSettings;
 412                                 if ( !is_null( $default ) && $default !== false ) {
 413                                         $desc .= $paramPrefix . "Default: $default";
 414                                 }
 415
 416                                 $msg .= sprintf( "  %-19s - %s\n", $this->encodeParamName( $paramName ), $desc );
 417                         }
 418                         return $msg;
 419
 420                 } else {
 421                         return false;
 422                 }
 423         }
 424
 425         /**
 426          * Callback for preg_replace_callback() call in makeHelpMsg().
 427          * Replaces a source file name with a link to ViewVC
 428          *
 429          * @return string
 430          */
 431         public function makeHelpMsg_callback( $matches ) {
 432                 global $wgAutoloadClasses, $wgAutoloadLocalClasses;
 433
 434                 $file = '';
 435                 if ( isset( $wgAutoloadLocalClasses[get_class( $this )] ) ) {
 436                         $file = $wgAutoloadLocalClasses[get_class( $this )];
 437                 } elseif ( isset( $wgAutoloadClasses[get_class( $this )] ) ) {
 438                         $file = $wgAutoloadClasses[get_class( $this )];
 439                 }
 440
 441                 // Do some guesswork here
 442                 $path = strstr( $file, 'includes/api/' );
 443                 if ( $path === false ) {
 444                         $path = strstr( $file, 'extensions/' );
 445                 } else {
 446                         $path = 'phase3/' . $path;
 447                 }
 448
 449                 // Get the filename from $matches[2] instead of $file
 450                 // If they're not the same file, they're assumed to be in the
 451                 // same directory
 452                 // This is necessary to make stuff like ApiMain::getVersion()
 453                 // returning the version string for ApiBase work
 454                 if ( $path ) {
 455                         return "{$matches[0]}\n   http://svn.wikimedia.org/" .
 456                                 "viewvc/mediawiki/trunk/" . dirname( $path ) .
 457                                 "/{$matches[2]}";
 458                 }
 459                 return $matches[0];
 460         }
 461
 462         /**
 463          * Returns the description string for this module
 464          * @return mixed string or array of strings
 465          */
 466         protected function getDescription() {
 467                 return false;
 468         }
 469
 470         /**
 471          * Returns usage examples for this module. Return null if no examples are available.
 472          * @return mixed string or array of strings
 473          */
 474         protected function getExamples() {
 475                 return false;
 476         }
 477
 478         /**
 479          * Returns an array of allowed parameters (parameter name) => (default
 480          * value) or (parameter name) => (array with PARAM_* constants as keys)
 481          * Don't call this function directly: use getFinalParams() to allow
 482          * hooks to modify parameters as needed.
 483          * @return array or false
 484          */
 485         protected function getAllowedParams() {
 486                 return false;
 487         }
 488
 489         /**
 490          * Returns an array of parameter descriptions.
 491          * Don't call this functon directly: use getFinalParamDescription() to
 492          * allow hooks to modify descriptions as needed.
 493          * @return array or false
 494          */
 495         protected function getParamDescription() {
 496                 return false;
 497         }
 498
 499         /**
 500          * Get final list of parameters, after hooks have had a chance to
 501          * tweak it as needed.
 502          * @return array or false
 503          */
 504         public function getFinalParams() {
 505                 $params = $this->getAllowedParams();
 506                 wfRunHooks( 'APIGetAllowedParams', array( &$this, &$params ) );
 507                 return $params;
 508         }
 509
 510         /**
 511          * Get final description, after hooks have had a chance to tweak it as
 512          * needed.
 513          * @return array
 514          */
 515         public function getFinalParamDescription() {
 516                 $desc = $this->getParamDescription();
 517                 wfRunHooks( 'APIGetParamDescription', array( &$this, &$desc ) );
 518                 return $desc;
 519         }
 520
 521         /**
 522          * This method mangles parameter name based on the prefix supplied to the constructor.
 523          * Override this method to change parameter name during runtime
 524          * @param $paramName string Parameter name
 525          * @return string Prefixed parameter name
 526          */
 527         public function encodeParamName( $paramName ) {
 528                 return $this->mModulePrefix . $paramName;
 529         }
 530
 531         /**
 532          * Using getAllowedParams(), this function makes an array of the values
 533          * provided by the user, with key being the name of the variable, and
 534          * value - validated value from user or default. limits will not be
 535          * parsed if $parseLimit is set to false; use this when the max
 536          * limit is not definitive yet, e.g. when getting revisions.
 537          * @param $parseLimit Boolean: true by default
 538          * @return array
 539          */
 540         public function extractRequestParams( $parseLimit = true ) {
 541                 // Cache parameters, for performance and to avoid bug 24564.
 542                 if ( !isset( $this->mParamCache[$parseLimit] ) ) {
 543                         $params = $this->getFinalParams();
 544                         $results = array();
 545
 546                         if ( $params ) { // getFinalParams() can return false
 547                                 foreach ( $params as $paramName => $paramSettings ) {
 548                                         $results[$paramName] = $this->getParameterFromSettings(
 549                                                 $paramName, $paramSettings, $parseLimit );
 550                                 }
 551                         }
 552                         $this->mParamCache[$parseLimit] = $results;
 553                 }
 554                 return $this->mParamCache[$parseLimit];
 555         }
 556
 557         /**
 558          * Get a value for the given parameter
 559          * @param $paramName string Parameter name
 560          * @param $parseLimit bool see extractRequestParams()
 561          * @return mixed Parameter value
 562          */
 563         protected function getParameter( $paramName, $parseLimit = true ) {
 564                 $params = $this->getFinalParams();
 565                 $paramSettings = $params[$paramName];
 566                 return $this->getParameterFromSettings( $paramName, $paramSettings, $parseLimit );
 567         }
 568
 569         /**
 570          * Die if none or more than one of a certain set of parameters is set and not false.
 571          * @param $params array of parameter names
 572          */
 573         public function requireOnlyOneParameter( $params ) {
 574                 $required = func_get_args();
 575                 array_shift( $required );
 576
 577                 $intersection = array_intersect( array_keys( array_filter( $params,
 578                                 array( $this, "parameterNotEmpty" ) ) ), $required );
 579
 580                 if ( count( $intersection ) > 1 ) {
 581                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 582                 } elseif ( count( $intersection ) == 0 ) {
 583                         $this->dieUsage( 'One of the parameters ' . implode( ', ', $required ) . ' is required', 'missingparam' );
 584                 }
 585         }
 586
 587         /**
 588          * Generates the possible errors requireOnlyOneParameter() can die with
 589          *
 590          * @param $params array
 591          * @return array
 592          */
 593         public function getRequireOnlyOneParameterErrorMessages( $params ) {
 594                 $p = $this->getModulePrefix();
 595                 $params = implode( ", {$p}", $params );
 596
 597                 return array(
 598                         array( 'code' => "{$p}missingparam", 'info' => "One of the parameters {$p}{$params} is required" ),
 599                         array( 'code' => "{$p}invalidparammix", 'info' => "The parameters {$p}{$params} can not be used together" )
 600                 );
 601         }
 602
 603         /**
 604          * Die if more than one of a certain set of parameters is set and not false.
 605          *
 606          * @param $params array
 607          */
 608         public function requireMaxOneParameter( $params ) {
 609                 $required = func_get_args();
 610                 array_shift( $required );
 611
 612                 $intersection = array_intersect( array_keys( array_filter( $params,
 613                                 array( $this, "parameterNotEmpty" ) ) ), $required );
 614
 615                 if ( count( $intersection ) > 1 ) {
 616                         $this->dieUsage( 'The parameters ' . implode( ', ', $intersection ) . ' can not be used together', 'invalidparammix' );
 617                 }
 618         }
 619
 620         /**
 621          * Generates the possible error requireMaxOneParameter() can die with
 622          *
 623          * @param $params array
 624          * @return array
 625          */
 626         public function getRequireMaxOneParameterErrorMessages( $params ) {
 627                 $p = $this->getModulePrefix();
 628                 $params = implode( ", {$p}", $params );
 629
 630                 return array(
 631                         array( 'code' => "{$p}invalidparammix", 'info' => "The parameters {$p}{$params} can not be used together" )
 632                 );
 633         }
 634
 635         /**
 636          * Callback function used in requireOnlyOneParameter to check whether reequired parameters are set
 637          *
 638          * @param  $x object Parameter to check is not null/false
 639          * @return bool
 640          */
 641         private function parameterNotEmpty( $x ) {
 642                 return !is_null( $x ) && $x !== false;
 643         }
 644
 645         /**
 646          * @deprecated since 1.17 use MWNamespace::getValidNamespaces()
 647          */
 648         public static function getValidNamespaces() {
 649                 return MWNamespace::getValidNamespaces();
 650         }
 651
 652         /**
 653          * Return true if we're to watch the page, false if not, null if no change.
 654          * @param $watchlist String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 655          * @param $titleObj Title the page under consideration
 656          * @param $userOption String The user option to consider when $watchlist=preferences.
 657          *      If not set will magically default to either watchdefault or watchcreations
 658          * @return bool
 659          */
 660         protected function getWatchlistValue ( $watchlist, $titleObj, $userOption = null ) {
 661
 662                 $userWatching = $titleObj->userIsWatching();
 663
 664                 global $wgUser;
 665                 switch ( $watchlist ) {
 666                         case 'watch':
 667                                 return true;
 668
 669                         case 'unwatch':
 670                                 return false;
 671
 672                         case 'preferences':
 673                                 # If the user is already watching, don't bother checking
 674                                 if ( $userWatching ) {
 675                                         return true;
 676                                 }
 677                                 # If no user option was passed, use watchdefault or watchcreation
 678                                 if ( is_null( $userOption ) ) {
 679                                         $userOption = $titleObj->exists()
 680                                                 ? 'watchdefault' : 'watchcreations';
 681                                 }
 682                                 # Watch the article based on the user preference
 683                                 return (bool)$wgUser->getOption( $userOption );
 684
 685                         case 'nochange':
 686                                 return $userWatching;
 687
 688                         default:
 689                                 return $userWatching;
 690                 }
 691         }
 692
 693         /**
 694          * Set a watch (or unwatch) based the based on a watchlist parameter.
 695          * @param $watch String Valid values: 'watch', 'unwatch', 'preferences', 'nochange'
 696          * @param $titleObj Title the article's title to change
 697          * @param $userOption String The user option to consider when $watch=preferences
 698          */
 699         protected function setWatch( $watch, $titleObj, $userOption = null ) {
 700                 $value = $this->getWatchlistValue( $watch, $titleObj, $userOption );
 701                 if ( $value === null ) {
 702                         return;
 703                 }
 704
 705                 global $wgUser;
 706                 if ( $value ) {
 707                         WatchAction::doWatch( $titleObj, $wgUser );
 708                 } else {
 709                         WatchAction::doUnwatch( $titleObj, $wgUser );
 710                 }
 711         }
 712
 713         /**
 714          * Using the settings determine the value for the given parameter
 715          *
 716          * @param $paramName String: parameter name
 717          * @param $paramSettings Mixed: default value or an array of settings
 718          *  using PARAM_* constants.
 719          * @param $parseLimit Boolean: parse limit?
 720          * @return mixed Parameter value
 721          */
 722         protected function getParameterFromSettings( $paramName, $paramSettings, $parseLimit ) {
 723                 // Some classes may decide to change parameter names
 724                 $encParamName = $this->encodeParamName( $paramName );
 725
 726                 if ( !is_array( $paramSettings ) ) {
 727                         $default = $paramSettings;
 728                         $multi = false;
 729                         $type = gettype( $paramSettings );
 730                         $dupes = false;
 731                         $deprecated = false;
 732                         $required = false;
 733                 } else {
 734                         $default = isset( $paramSettings[self::PARAM_DFLT] ) ? $paramSettings[self::PARAM_DFLT] : null;
 735                         $multi = isset( $paramSettings[self::PARAM_ISMULTI] ) ? $paramSettings[self::PARAM_ISMULTI] : false;
 736                         $type = isset( $paramSettings[self::PARAM_TYPE] ) ? $paramSettings[self::PARAM_TYPE] : null;
 737                         $dupes = isset( $paramSettings[self::PARAM_ALLOW_DUPLICATES] ) ? $paramSettings[self::PARAM_ALLOW_DUPLICATES] : false;
 738                         $deprecated = isset( $paramSettings[self::PARAM_DEPRECATED] ) ? $paramSettings[self::PARAM_DEPRECATED] : false;
 739                         $required = isset( $paramSettings[self::PARAM_REQUIRED] ) ? $paramSettings[self::PARAM_REQUIRED] : false;
 740
 741                         // When type is not given, and no choices, the type is the same as $default
 742                         if ( !isset( $type ) ) {
 743                                 if ( isset( $default ) ) {
 744                                         $type = gettype( $default );
 745                                 } else {
 746                                         $type = 'NULL'; // allow everything
 747                                 }
 748                         }
 749                 }
 750
 751                 if ( $type == 'boolean' ) {
 752                         if ( isset( $default ) && $default !== false ) {
 753                                 // Having a default value of anything other than 'false' is pointless
 754                                 ApiBase::dieDebug( __METHOD__, "Boolean param $encParamName's default is set to '$default'" );
 755                         }
 756
 757                         $value = $this->getMain()->getRequest()->getCheck( $encParamName );
 758                 } else {
 759                         $value = $this->getMain()->getRequest()->getVal( $encParamName, $default );
 760
 761                         if ( isset( $value ) && $type == 'namespace' ) {
 762                                 $type = MWNamespace::getValidNamespaces();
 763                         }
 764                 }
 765
 766                 if ( isset( $value ) && ( $multi || is_array( $type ) ) ) {
 767                         $value = $this->parseMultiValue( $encParamName, $value, $multi, is_array( $type ) ? $type : null );
 768                 }
 769
 770                 // More validation only when choices were not given
 771                 // choices were validated in parseMultiValue()
 772                 if ( isset( $value ) ) {
 773                         if ( !is_array( $type ) ) {
 774                                 switch ( $type ) {
 775                                         case 'NULL': // nothing to do
 776                                                 break;
 777                                         case 'string':
 778                                                 if ( $required && $value === '' ) {
 779                                                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 780                                                 }
 781
 782                                                 break;
 783                                         case 'integer': // Force everything using intval() and optionally validate limits
 784                                                 $min = isset ( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : null;
 785                                                 $max = isset ( $paramSettings[self::PARAM_MAX] ) ? $paramSettings[self::PARAM_MAX] : null;
 786                                                 $enforceLimits = isset ( $paramSettings[self::PARAM_RANGE_ENFORCE] )
 787                                                                 ? $paramSettings[self::PARAM_RANGE_ENFORCE] : false;
 788
 789                                                 if ( is_array( $value ) ) {
 790                                                         $value = array_map( 'intval', $value );
 791                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 792                                                                 foreach ( $value as &$v ) {
 793                                                                         $this->validateLimit( $paramName, $v, $min, $max, null, $enforceLimits );
 794                                                                 }
 795                                                         }
 796                                                 } else {
 797                                                         $value = intval( $value );
 798                                                         if ( !is_null( $min ) || !is_null( $max ) ) {
 799                                                                 $this->validateLimit( $paramName, $value, $min, $max, null, $enforceLimits );
 800                                                         }
 801                                                 }
 802                                                 break;
 803                                         case 'limit':
 804                                                 if ( !$parseLimit ) {
 805                                                         // Don't do any validation whatsoever
 806                                                         break;
 807                                                 }
 808                                                 if ( !isset( $paramSettings[self::PARAM_MAX] ) || !isset( $paramSettings[self::PARAM_MAX2] ) ) {
 809                                                         ApiBase::dieDebug( __METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName" );
 810                                                 }
 811                                                 if ( $multi ) {
 812                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 813                                                 }
 814                                                 $min = isset( $paramSettings[self::PARAM_MIN] ) ? $paramSettings[self::PARAM_MIN] : 0;
 815                                                 if ( $value == 'max' ) {
 816                                                         $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self::PARAM_MAX2] : $paramSettings[self::PARAM_MAX];
 817                                                         $this->getResult()->setParsedLimit( $this->getModuleName(), $value );
 818                                                 } else {
 819                                                         $value = intval( $value );
 820                                                         $this->validateLimit( $paramName, $value, $min, $paramSettings[self::PARAM_MAX], $paramSettings[self::PARAM_MAX2] );
 821                                                 }
 822                                                 break;
 823                                         case 'boolean':
 824                                                 if ( $multi ) {
 825                                                         ApiBase::dieDebug( __METHOD__, "Multi-values not supported for $encParamName" );
 826                                                 }
 827                                                 break;
 828                                         case 'timestamp':
 829                                                 if ( is_array( $value ) ) {
 830                                                         foreach ( $value as $key => $val ) {
 831                                                                 $value[$key] = $this->validateTimestamp( $val, $encParamName );
 832                                                         }
 833                                                 } else {
 834                                                         $value = $this->validateTimestamp( $value, $encParamName );
 835                                                 }
 836                                                 break;
 837                                         case 'user':
 838                                                 if ( !is_array( $value ) ) {
 839                                                         $value = array( $value );
 840                                                 }
 841
 842                                                 foreach ( $value as $key => $val ) {
 843                                                         $title = Title::makeTitleSafe( NS_USER, $val );
 844                                                         if ( is_null( $title ) ) {
 845                                                                 $this->dieUsage( "Invalid value for user parameter $encParamName", "baduser_{$encParamName}" );
 846                                                         }
 847                                                         $value[$key] = $title->getText();
 848                                                 }
 849
 850                                                 if ( !$multi ) {
 851                                                         $value = $value[0];
 852                                                 }
 853                                                 break;
 854                                         default:
 855                                                 ApiBase::dieDebug( __METHOD__, "Param $encParamName's type is unknown - $type" );
 856                                 }
 857                         }
 858
 859                         // Throw out duplicates if requested
 860                         if ( is_array( $value ) && !$dupes ) {
 861                                 $value = array_unique( $value );
 862                         }
 863
 864                         // Set a warning if a deprecated parameter has been passed
 865                         if ( $deprecated && $value !== false ) {
 866                                 $this->setWarning( "The $encParamName parameter has been deprecated." );
 867                         }
 868                 } elseif ( $required ) {
 869                         $this->dieUsageMsg( array( 'missingparam', $paramName ) );
 870                 }
 871
 872                 return $value;
 873         }
 874
 875         /**
 876          * Return an array of values that were given in a 'a|b|c' notation,
 877          * after it optionally validates them against the list allowed values.
 878          *
 879          * @param $valueName string The name of the parameter (for error
 880          *  reporting)
 881          * @param $value mixed The value being parsed
 882          * @param $allowMultiple bool Can $value contain more than one value
 883          *  separated by '|'?
 884          * @param $allowedValues mixed An array of values to check against. If
 885          *  null, all values are accepted.
 886          * @return mixed (allowMultiple ? an_array_of_values : a_single_value)
 887          */
 888         protected function parseMultiValue( $valueName, $value, $allowMultiple, $allowedValues ) {
 889                 if ( trim( $value ) === '' && $allowMultiple ) {
 890                         return array();
 891                 }
 892
 893                 // This is a bit awkward, but we want to avoid calling canApiHighLimits() because it unstubs $wgUser
 894                 $valuesList = explode( '|', $value, self::LIMIT_SML2 + 1 );
 895                 $sizeLimit = count( $valuesList ) > self::LIMIT_SML1 && $this->mMainModule->canApiHighLimits() ?
 896                         self::LIMIT_SML2 : self::LIMIT_SML1;
 897
 898                 if ( self::truncateArray( $valuesList, $sizeLimit ) ) {
 899                         $this->setWarning( "Too many values supplied for parameter '$valueName': the limit is $sizeLimit" );
 900                 }
 901
 902                 if ( !$allowMultiple && count( $valuesList ) != 1 ) {
 903                         $possibleValues = is_array( $allowedValues ) ? "of '" . implode( "', '", $allowedValues ) . "'" : '';
 904                         $this->dieUsage( "Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName" );
 905                 }
 906
 907                 if ( is_array( $allowedValues ) ) {
 908                         // Check for unknown values
 909                         $unknown = array_diff( $valuesList, $allowedValues );
 910                         if ( count( $unknown ) ) {
 911                                 if ( $allowMultiple ) {
 912                                         $s = count( $unknown ) > 1 ? 's' : '';
 913                                         $vals = implode( ", ", $unknown );
 914                                         $this->setWarning( "Unrecognized value$s for parameter '$valueName': $vals" );
 915                                 } else {
 916                                         $this->dieUsage( "Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName" );
 917                                 }
 918                         }
 919                         // Now throw them out
 920                         $valuesList = array_intersect( $valuesList, $allowedValues );
 921                 }
 922
 923                 return $allowMultiple ? $valuesList : $valuesList[0];
 924         }
 925
 926         /**
 927          * Validate the value against the minimum and user/bot maximum limits.
 928          * Prints usage info on failure.
 929          * @param $paramName string Parameter name
 930          * @param $value int Parameter value
 931          * @param $min int|null Minimum value
 932          * @param $max int|null Maximum value for users
 933          * @param $botMax int Maximum value for sysops/bots
 934          * @param $enforceLimits Boolean Whether to enforce (die) if value is outside limits
 935          */
 936         function validateLimit( $paramName, &$value, $min, $max, $botMax = null, $enforceLimits = false ) {
 937                 if ( !is_null( $min ) && $value < $min ) {
 938
 939                         $msg = $this->encodeParamName( $paramName ) . " may not be less than $min (set to $value)";
 940                         $this->warnOrDie( $msg, $enforceLimits );
 941                         $value = $min;
 942                 }
 943
 944                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 945                 if ( $this->getMain()->isInternalMode() ) {
 946                         return;
 947                 }
 948
 949                 // Optimization: do not check user's bot status unless really needed -- skips db query
 950                 // assumes $botMax >= $max
 951                 if ( !is_null( $max ) && $value > $max ) {
 952                         if ( !is_null( $botMax ) && $this->getMain()->canApiHighLimits() ) {
 953                                 if ( $value > $botMax ) {
 954                                         $msg = $this->encodeParamName( $paramName ) . " may not be over $botMax (set to $value) for bots or sysops";
 955                                         $this->warnOrDie( $msg, $enforceLimits );
 956                                         $value = $botMax;
 957                                 }
 958                         } else {
 959                                 $msg = $this->encodeParamName( $paramName ) . " may not be over $max (set to $value) for users";
 960                                 $this->warnOrDie( $msg, $enforceLimits );
 961                                 $value = $max;
 962                         }
 963                 }
 964         }
 965
 966         /**
 967          * @param $value string
 968          * @param $paramName string
 969          * @return string
 970          */
 971         function validateTimestamp( $value, $paramName ) {
 972                 $value = wfTimestamp( TS_UNIX, $value );
 973                 if ( $value === 0 ) {
 974                         $this->dieUsage( "Invalid value '$value' for timestamp parameter $paramName", "badtimestamp_{$paramName}" );
 975                 }
 976                 return wfTimestamp( TS_MW, $value );
 977         }
 978
 979         /**
 980          * Adds a warning to the output, else dies
 981          *
 982          * @param  $msg String Message to show as a warning, or error message if dying
 983          * @param  $enforceLimits Boolean Whether this is an enforce (die)
 984          */
 985         private function warnOrDie( $msg, $enforceLimits = false ) {
 986                 if ( $enforceLimits ) {
 987                         $this->dieUsage( $msg, 'integeroutofrange' );
 988                 } else {
 989                         $this->setWarning( $msg );
 990                 }
 991         }
 992
 993         /**
 994          * Truncate an array to a certain length.
 995          * @param $arr array Array to truncate
 996          * @param $limit int Maximum length
 997          * @return bool True if the array was truncated, false otherwise
 998          */
 999         public static function truncateArray( &$arr, $limit ) {
1000                 $modified = false;
1001                 while ( count( $arr ) > $limit ) {
1002                         array_pop( $arr );
1003                         $modified = true;
1004                 }
1005                 return $modified;
1006         }
1007
1008         /**
1009          * Throw a UsageException, which will (if uncaught) call the main module's
1010          * error handler and die with an error message.
1011          *
1012          * @param $description string One-line human-readable description of the
1013          *   error condition, e.g., "The API requires a valid action parameter"
1014          * @param $errorCode string Brief, arbitrary, stable string to allow easy
1015          *   automated identification of the error, e.g., 'unknown_action'
1016          * @param $httpRespCode int HTTP response code
1017          * @param $extradata array Data to add to the <error> element; array in ApiResult format
1018          */
1019         public function dieUsage( $description, $errorCode, $httpRespCode = 0, $extradata = null ) {
1020                 Profiler::instance()->close();
1021                 throw new UsageException( $description, $this->encodeParamName( $errorCode ), $httpRespCode, $extradata );
1022         }
1023
1024         /**
1025          * Array that maps message keys to error messages. $1 and friends are replaced.
1026          */
1027         public static $messageMap = array(
1028                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
1029                 'unknownerror' => array( 'code' => 'unknownerror', 'info' => "Unknown error: ``\$1''" ),
1030                 'unknownerror-nocode' => array( 'code' => 'unknownerror', 'info' => 'Unknown error' ),
1031
1032                 // Messages from Title::getUserPermissionsErrors()
1033                 'ns-specialprotected' => array( 'code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited" ),
1034                 'protectedinterface' => array( 'code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages" ),
1035                 'namespaceprotected' => array( 'code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace" ),
1036                 'customcssprotected' => array( 'code' => 'customcssprotected', 'info' => "You're not allowed to edit custom CSS pages" ),
1037                 'customjsprotected' => array( 'code' => 'customjsprotected', 'info' => "You're not allowed to edit custom JavaScript pages" ),
1038                 'cascadeprotected' => array( 'code' => 'cascadeprotected', 'info' => "The page you're trying to edit is protected because it's included in a cascade-protected page" ),
1039                 'protectedpagetext' => array( 'code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page" ),
1040                 'protect-cantedit' => array( 'code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it" ),
1041                 'badaccess-group0' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ), // Generic permission denied message
1042                 'badaccess-groups' => array( 'code' => 'permissiondenied', 'info' => "Permission denied" ),
1043                 'titleprotected' => array( 'code' => 'protectedtitle', 'info' => "This title has been protected from creation" ),
1044                 'nocreate-loggedin' => array( 'code' => 'cantcreate', 'info' => "You don't have permission to create new pages" ),
1045                 'nocreatetext' => array( 'code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages" ),
1046                 'movenologintext' => array( 'code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages" ),
1047                 'movenotallowed' => array( 'code' => 'cantmove', 'info' => "You don't have permission to move pages" ),
1048                 'confirmedittext' => array( 'code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit" ),
1049                 'blockedtext' => array( 'code' => 'blocked', 'info' => "You have been blocked from editing" ),
1050                 'autoblockedtext' => array( 'code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user" ),
1051
1052                 // Miscellaneous interface messages
1053                 'actionthrottledtext' => array( 'code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again" ),
1054                 'alreadyrolled' => array( 'code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back" ),
1055                 'cantrollback' => array( 'code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author" ),
1056                 'readonlytext' => array( 'code' => 'readonly', 'info' => "The wiki is currently in read-only mode" ),
1057                 'sessionfailure' => array( 'code' => 'badtoken', 'info' => "Invalid token" ),
1058                 'cannotdelete' => array( 'code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else" ),
1059                 'notanarticle' => array( 'code' => 'missingtitle', 'info' => "The page you requested doesn't exist" ),
1060                 'selfmove' => array( 'code' => 'selfmove', 'info' => "Can't move a page to itself" ),
1061                 'immobile_namespace' => array( 'code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving" ),
1062                 'articleexists' => array( 'code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article" ),
1063                 'protectedpage' => array( 'code' => 'protectedpage', 'info' => "You don't have permission to perform this move" ),
1064                 'hookaborted' => array( 'code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook" ),
1065                 'cantmove-titleprotected' => array( 'code' => 'protectedtitle', 'info' => "The destination article has been protected from creation" ),
1066                 'imagenocrossnamespace' => array( 'code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace" ),
1067                 'imagetypemismatch' => array( 'code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type" ),
1068                 // 'badarticleerror' => shouldn't happen
1069                 // 'badtitletext' => shouldn't happen
1070                 'ip_range_invalid' => array( 'code' => 'invalidrange', 'info' => "Invalid IP range" ),
1071                 'range_block_disabled' => array( 'code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled" ),
1072                 'nosuchusershort' => array( 'code' => 'nosuchuser', 'info' => "The user you specified doesn't exist" ),
1073                 'badipaddress' => array( 'code' => 'invalidip', 'info' => "Invalid IP address specified" ),
1074                 'ipb_expiry_invalid' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time" ),
1075                 'ipb_already_blocked' => array( 'code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked" ),
1076                 '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." ),
1077                 'ipb_cant_unblock' => array( 'code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already" ),
1078                 '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" ),
1079                 'ipbblocked' => array( 'code' => 'ipbblocked', 'info' => 'You cannot block or unblock users while you are yourself blocked' ),
1080                 'ipbnounblockself' => array( 'code' => 'ipbnounblockself', 'info' => 'You are not allowed to unblock yourself' ),
1081                 'usermaildisabled' => array( 'code' => 'usermaildisabled', 'info' => "User email has been disabled" ),
1082                 'blockedemailuser' => array( 'code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail" ),
1083                 'notarget' => array( 'code' => 'notarget', 'info' => "You have not specified a valid target for this action" ),
1084                 '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" ),
1085                 'rcpatroldisabled' => array( 'code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki" ),
1086                 'markedaspatrollederror-noautopatrol' => array( 'code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes" ),
1087                 'delete-toobig' => array( 'code' => 'bigdelete', 'info' => "You can't delete this page because it has more than \$1 revisions" ),
1088                 'movenotallowedfile' => array( 'code' => 'cantmovefile', 'info' => "You don't have permission to move files" ),
1089                 'userrights-no-interwiki' => array( 'code' => 'nointerwikiuserrights', 'info' => "You don't have permission to change user rights on other wikis" ),
1090                 'userrights-nodatabase' => array( 'code' => 'nosuchdatabase', 'info' => "Database ``\$1'' does not exist or is not local" ),
1091                 'nouserspecified' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1092                 'noname' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1093                 'summaryrequired' => array( 'code' => 'summaryrequired', 'info' => 'Summary required' ),
1094
1095                 // API-specific messages
1096                 'readrequired' => array( 'code' => 'readapidenied', 'info' => "You need read permission to use this module" ),
1097                 '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" ),
1098                 'writerequired' => array( 'code' => 'writeapidenied', 'info' => "You're not allowed to edit this wiki through the API" ),
1099                 'missingparam' => array( 'code' => 'no$1', 'info' => "The \$1 parameter must be set" ),
1100                 'invalidtitle' => array( 'code' => 'invalidtitle', 'info' => "Bad title ``\$1''" ),
1101                 'nosuchpageid' => array( 'code' => 'nosuchpageid', 'info' => "There is no page with ID \$1" ),
1102                 'nosuchrevid' => array( 'code' => 'nosuchrevid', 'info' => "There is no revision with ID \$1" ),
1103                 'nosuchuser' => array( 'code' => 'nosuchuser', 'info' => "User ``\$1'' doesn't exist" ),
1104                 'invaliduser' => array( 'code' => 'invaliduser', 'info' => "Invalid username ``\$1''" ),
1105                 'invalidexpiry' => array( 'code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''" ),
1106                 'pastexpiry' => array( 'code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past" ),
1107                 'create-titleexists' => array( 'code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'" ),
1108                 'missingtitle-createonly' => array( 'code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'" ),
1109                 'cantblock' => array( 'code' => 'cantblock', 'info' => "You don't have permission to block users" ),
1110                 'canthide' => array( 'code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log" ),
1111                 'cantblock-email' => array( 'code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki" ),
1112                 'unblock-notarget' => array( 'code' => 'notarget', 'info' => "Either the id or the user parameter must be set" ),
1113                 'unblock-idanduser' => array( 'code' => 'idanduser', 'info' => "The id and user parameters can't be used together" ),
1114                 'cantunblock' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to unblock users" ),
1115                 'cannotundelete' => array( 'code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already" ),
1116                 'permdenied-undelete' => array( 'code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions" ),
1117                 'createonly-exists' => array( 'code' => 'articleexists', 'info' => "The article you tried to create has been created already" ),
1118                 'nocreate-missing' => array( 'code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist" ),
1119                 'nosuchrcid' => array( 'code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''" ),
1120                 'protect-invalidaction' => array( 'code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''" ),
1121                 'protect-invalidlevel' => array( 'code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''" ),
1122                 'toofewexpiries' => array( 'code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed" ),
1123                 'cantimport' => array( 'code' => 'cantimport', 'info' => "You don't have permission to import pages" ),
1124                 'cantimport-upload' => array( 'code' => 'cantimport-upload', 'info' => "You don't have permission to import uploaded pages" ),
1125                 'nouploadmodule' => array( 'code' => 'nomodule', 'info' => 'No upload module set' ),
1126                 'importnofile' => array( 'code' => 'nofile', 'info' => "You didn't upload a file" ),
1127                 'importuploaderrorsize' => array( 'code' => 'filetoobig', 'info' => 'The file you uploaded is bigger than the maximum upload size' ),
1128                 'importuploaderrorpartial' => array( 'code' => 'partialupload', 'info' => 'The file was only partially uploaded' ),
1129                 'importuploaderrortemp' => array( 'code' => 'notempdir', 'info' => 'The temporary upload directory is missing' ),
1130                 'importcantopen' => array( 'code' => 'cantopenfile', 'info' => "Couldn't open the uploaded file" ),
1131                 'import-noarticle' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1132                 'importbadinterwiki' => array( 'code' => 'badinterwiki', 'info' => 'Invalid interwiki title specified' ),
1133                 'import-unknownerror' => array( 'code' => 'import-unknownerror', 'info' => "Unknown error on import: ``\$1''" ),
1134                 'cantoverwrite-sharedfile' => array( 'code' => 'cantoverwrite-sharedfile', 'info' => 'The target file exists on a shared repository and you do not have permission to override it' ),
1135                 'sharedfile-exists' => array( 'code' => 'fileexists-sharedrepo-perm', 'info' => 'The target file exists on a shared repository. Use the ignorewarnings parameter to override it.' ),
1136                 'mustbeposted' => array( 'code' => 'mustbeposted', 'info' => "The \$1 module requires a POST request" ),
1137                 'show' => array( 'code' => 'show', 'info' => 'Incorrect parameter - mutually exclusive values may not be supplied' ),
1138                 'specialpage-cantexecute' => array( 'code' => 'specialpage-cantexecute', 'info' => "You don't have permission to view the results of this special page" ),
1139
1140                 // ApiEditPage messages
1141                 'noimageredirect-anon' => array( 'code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects" ),
1142                 'noimageredirect-logged' => array( 'code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects" ),
1143                 'spamdetected' => array( 'code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''" ),
1144                 'filtered' => array( 'code' => 'filtered', 'info' => "The filter callback function refused your edit" ),
1145                 'contenttoobig' => array( 'code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 kilobytes" ),
1146                 'noedit-anon' => array( 'code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages" ),
1147                 'noedit' => array( 'code' => 'noedit', 'info' => "You don't have permission to edit pages" ),
1148                 'wasdeleted' => array( 'code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp" ),
1149                 'blankpage' => array( 'code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed" ),
1150                 'editconflict' => array( 'code' => 'editconflict', 'info' => "Edit conflict detected" ),
1151                 'hashcheckfailed' => array( 'code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect" ),
1152                 'missingtext' => array( 'code' => 'notext', 'info' => "One of the text, appendtext, prependtext and undo parameters must be set" ),
1153                 'emptynewsection' => array( 'code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.' ),
1154                 'revwrongpage' => array( 'code' => 'revwrongpage', 'info' => "r\$1 is not a revision of ``\$2''" ),
1155                 'undo-failure' => array( 'code' => 'undofailure', 'info' => 'Undo failed due to conflicting intermediate edits' ),
1156
1157                 // uploadMsgs
1158                 'invalid-session-key' => array( 'code' => 'invalid-session-key', 'info' => 'Not a valid session key' ),
1159                 'nouploadmodule' => array( 'code' => 'nouploadmodule', 'info' => 'No upload module set' ),
1160                 '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' ),
1161                 'copyuploaddisabled' => array( 'code' => 'copyuploaddisabled', 'info' => 'Uploads by URL is not enabled.  Make sure $wgAllowCopyUploads is set to true in LocalSettings.php.' ),
1162
1163                 'filename-tooshort' => array( 'code' => 'filename-tooshort', 'info' => 'The filename is too short' ),
1164                 'illegal-filename' => array( 'code' => 'illegal-filename', 'info' => 'The filename is not allowed' ),
1165                 'filetype-missing' => array( 'code' => 'filetype-missing', 'info' => 'The file is missing an extension' ),
1166         );
1167
1168         /**
1169          * Helper function for readonly errors
1170          */
1171         public function dieReadOnly() {
1172                 $parsed = $this->parseMsg( array( 'readonlytext' ) );
1173                 $this->dieUsage( $parsed['info'], $parsed['code'], /* http error */ 0,
1174                         array( 'readonlyreason' => wfReadOnlyReason() ) );
1175         }
1176
1177         /**
1178          * Output the error message related to a certain array
1179          * @param $error (array|string) Element of a getUserPermissionsErrors()-style array
1180          */
1181         public function dieUsageMsg( $error ) {
1182                 # most of the time we send a 1 element, so we might as well send it as
1183                 # a string and make this an array here.
1184                 if( is_string( $error ) ) {
1185                         $error = array( $error );
1186                 }
1187                 $parsed = $this->parseMsg( $error );
1188                 $this->dieUsage( $parsed['info'], $parsed['code'] );
1189         }
1190
1191         /**
1192          * Return the error message related to a certain array
1193          * @param $error array Element of a getUserPermissionsErrors()-style array
1194          * @return array('code' => code, 'info' => info)
1195          */
1196         public function parseMsg( $error ) {
1197                 $key = array_shift( $error );
1198
1199                 // Check whether the error array was nested
1200                 // array( array( <code>, <params> ), array( <another_code>, <params> ) )
1201                 if( is_array( $key ) ){
1202                         $error = $key;
1203                         $key = array_shift( $error );
1204                 }
1205
1206                 if ( isset( self::$messageMap[$key] ) ) {
1207                         return array( 'code' =>
1208                                 wfMsgReplaceArgs( self::$messageMap[$key]['code'], $error ),
1209                                         'info' =>
1210                                 wfMsgReplaceArgs( self::$messageMap[$key]['info'], $error )
1211                         );
1212                 }
1213
1214                 // If the key isn't present, throw an "unknown error"
1215                 return $this->parseMsg( array( 'unknownerror', $key ) );
1216         }
1217
1218         /**
1219          * Internal code errors should be reported with this method
1220          * @param $method string Method or function name
1221          * @param $message string Error message
1222          */
1223         protected static function dieDebug( $method, $message ) {
1224                 wfDebugDieBacktrace( "Internal error in $method: $message" );
1225         }
1226
1227         /**
1228          * Indicates if this module needs maxlag to be checked
1229          * @return bool
1230          */
1231         public function shouldCheckMaxlag() {
1232                 return true;
1233         }
1234
1235         /**
1236          * Indicates whether this module requires read rights
1237          * @return bool
1238          */
1239         public function isReadMode() {
1240                 return true;
1241         }
1242         /**
1243          * Indicates whether this module requires write mode
1244          * @return bool
1245          */
1246         public function isWriteMode() {
1247                 return false;
1248         }
1249
1250         /**
1251          * Indicates whether this module must be called with a POST request
1252          * @return bool
1253          */
1254         public function mustBePosted() {
1255                 return false;
1256         }
1257
1258         /**
1259          * Returns whether this module requires a Token to execute
1260          * @return bool
1261          */
1262         public function needsToken() {
1263                 return false;
1264         }
1265
1266         /**
1267          * 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
1268          * @return bool
1269          */
1270         public function getTokenSalt() {
1271                 return false;
1272         }
1273
1274         /**
1275          * Gets the user for whom to get the watchlist
1276          *
1277          * @param $params array
1278          * @return User
1279          */
1280         public function getWatchlistUser( $params ) {
1281                 global $wgUser;
1282                 if ( !is_null( $params['owner'] ) && !is_null( $params['token'] ) ) {
1283                         $user = User::newFromName( $params['owner'], false );
1284                         if ( !$user->getId() ) {
1285                                 $this->dieUsage( 'Specified user does not exist', 'bad_wlowner' );
1286                         }
1287                         $token = $user->getOption( 'watchlisttoken' );
1288                         if ( $token == '' || $token != $params['token'] ) {
1289                                 $this->dieUsage( 'Incorrect watchlist token provided -- please set a correct token in Special:Preferences', 'bad_wltoken' );
1290                         }
1291                 } else {
1292                         if ( !$wgUser->isLoggedIn() ) {
1293                                 $this->dieUsage( 'You must be logged-in to have a watchlist', 'notloggedin' );
1294                         }
1295                         $user = $wgUser;
1296                 }
1297                 return $user;
1298         }
1299
1300         /**
1301          * Returns a list of all possible errors returned by the module
1302          * @return array in the format of array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1303          */
1304         public function getPossibleErrors() {
1305                 $ret = array();
1306
1307                 $params = $this->getFinalParams();
1308                 if ( $params ) {
1309                         foreach ( $params as $paramName => $paramSettings ) {
1310                                 if ( isset( $paramSettings[ApiBase::PARAM_REQUIRED] ) ) {
1311                                         $ret[] = array( 'missingparam', $paramName );
1312                                 }
1313                         }
1314                 }
1315
1316                 if ( $this->mustBePosted() ) {
1317                         $ret[] = array( 'mustbeposted', $this->getModuleName() );
1318                 }
1319
1320                 if ( $this->isReadMode() ) {
1321                         $ret[] = array( 'readrequired' );
1322                 }
1323
1324                 if ( $this->isWriteMode() ) {
1325                         $ret[] = array( 'writerequired' );
1326                         $ret[] = array( 'writedisabled' );
1327                 }
1328
1329                 if ( $this->needsToken() ) {
1330                         $ret[] = array( 'missingparam', 'token' );
1331                         $ret[] = array( 'sessionfailure' );
1332                 }
1333
1334                 return $ret;
1335         }
1336
1337         /**
1338          * Parses a list of errors into a standardised format
1339          * @param $errors array List of errors. Items can be in the for array( key, param1, param2, ... ) or array( 'code' => ..., 'info' => ... )
1340          * @return array Parsed list of errors with items in the form array( 'code' => ..., 'info' => ... )
1341          */
1342         public function parseErrors( $errors ) {
1343                 $ret = array();
1344
1345                 foreach ( $errors as $row ) {
1346                         if ( isset( $row['code'] ) && isset( $row['info'] ) ) {
1347                                 $ret[] = $row;
1348                         } else {
1349                                 $ret[] = $this->parseMsg( $row );
1350                         }
1351                 }
1352                 return $ret;
1353         }
1354
1355         /**
1356          * Profiling: total module execution time
1357          */
1358         private $mTimeIn = 0, $mModuleTime = 0;
1359
1360         /**
1361          * Start module profiling
1362          */
1363         public function profileIn() {
1364                 if ( $this->mTimeIn !== 0 ) {
1365                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileOut()' );
1366                 }
1367                 $this->mTimeIn = microtime( true );
1368                 wfProfileIn( $this->getModuleProfileName() );
1369         }
1370
1371         /**
1372          * End module profiling
1373          */
1374         public function profileOut() {
1375                 if ( $this->mTimeIn === 0 ) {
1376                         ApiBase::dieDebug( __METHOD__, 'called without calling profileIn() first' );
1377                 }
1378                 if ( $this->mDBTimeIn !== 0 ) {
1379                         ApiBase::dieDebug( __METHOD__, 'must be called after database profiling is done with profileDBOut()' );
1380                 }
1381
1382                 $this->mModuleTime += microtime( true ) - $this->mTimeIn;
1383                 $this->mTimeIn = 0;
1384                 wfProfileOut( $this->getModuleProfileName() );
1385         }
1386
1387         /**
1388          * When modules crash, sometimes it is needed to do a profileOut() regardless
1389          * of the profiling state the module was in. This method does such cleanup.
1390          */
1391         public function safeProfileOut() {
1392                 if ( $this->mTimeIn !== 0 ) {
1393                         if ( $this->mDBTimeIn !== 0 ) {
1394                                 $this->profileDBOut();
1395                         }
1396                         $this->profileOut();
1397                 }
1398         }
1399
1400         /**
1401          * Total time the module was executed
1402          * @return float
1403          */
1404         public function getProfileTime() {
1405                 if ( $this->mTimeIn !== 0 ) {
1406                         ApiBase::dieDebug( __METHOD__, 'called without calling profileOut() first' );
1407                 }
1408                 return $this->mModuleTime;
1409         }
1410
1411         /**
1412          * Profiling: database execution time
1413          */
1414         private $mDBTimeIn = 0, $mDBTime = 0;
1415
1416         /**
1417          * Start module profiling
1418          */
1419         public function profileDBIn() {
1420                 if ( $this->mTimeIn === 0 ) {
1421                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1422                 }
1423                 if ( $this->mDBTimeIn !== 0 ) {
1424                         ApiBase::dieDebug( __METHOD__, 'called twice without calling profileDBOut()' );
1425                 }
1426                 $this->mDBTimeIn = microtime( true );
1427                 wfProfileIn( $this->getModuleProfileName( true ) );
1428         }
1429
1430         /**
1431          * End database profiling
1432          */
1433         public function profileDBOut() {
1434                 if ( $this->mTimeIn === 0 ) {
1435                         ApiBase::dieDebug( __METHOD__, 'must be called while profiling the entire module with profileIn()' );
1436                 }
1437                 if ( $this->mDBTimeIn === 0 ) {
1438                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBIn() first' );
1439                 }
1440
1441                 $time = microtime( true ) - $this->mDBTimeIn;
1442                 $this->mDBTimeIn = 0;
1443
1444                 $this->mDBTime += $time;
1445                 $this->getMain()->mDBTime += $time;
1446                 wfProfileOut( $this->getModuleProfileName( true ) );
1447         }
1448
1449         /**
1450          * Total time the module used the database
1451          * @return float
1452          */
1453         public function getProfileDBTime() {
1454                 if ( $this->mDBTimeIn !== 0 ) {
1455                         ApiBase::dieDebug( __METHOD__, 'called without calling profileDBOut() first' );
1456                 }
1457                 return $this->mDBTime;
1458         }
1459
1460         /**
1461          * Debugging function that prints a value and an optional backtrace
1462          * @param $value mixed Value to print
1463          * @param $name string Description of the printed value
1464          * @param $backtrace bool If true, print a backtrace
1465          */
1466         public static function debugPrint( $value, $name = 'unknown', $backtrace = false ) {
1467                 print "\n\n<pre><b>Debugging value '$name':</b>\n\n";
1468                 var_export( $value );
1469                 if ( $backtrace ) {
1470                         print "\n" . wfBacktrace();
1471                 }
1472                 print "\n</pre>\n";
1473         }
1474
1475         /**
1476          * Returns a string that identifies the version of this class.
1477          * @return string
1478          */
1479         public static function getBaseVersion() {
1480                 return __CLASS__ . ': $Id$';
1481         }
1482 }