includes/api/ApiBase.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 5, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 /**
  27  * This abstract class implements many basic API functions, and is the base of all API classes.
  28  * The class functions are divided into several areas of functionality:
  29  *
  30  * Module parameters: Derived classes can define getAllowedParams() to specify which parameters to expect,
  31  *      how to parse and validate them.
  32  *
  33  * Profiling: various methods to allow keeping tabs on various tasks and their time costs
  34  *
  35  * Self-documentation: code to allow api to document its own state.
  36  *
  37  * @addtogroup API
  38  */
  39 abstract class ApiBase {
  40
  41         // These constants allow modules to specify exactly how to treat incomming parameters.
  42
  43         const PARAM_DFLT = 0;
  44         const PARAM_ISMULTI = 1;
  45         const PARAM_TYPE = 2;
  46         const PARAM_MAX = 3;
  47         const PARAM_MAX2 = 4;
  48         const PARAM_MIN = 5;
  49
  50         const LIMIT_BIG1 = 500; // Fast query, std user limit
  51         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  52         const LIMIT_SML1 = 50; // Slow query, std user limit
  53         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  54
  55         private $mMainModule, $mModuleName, $mModulePrefix;
  56
  57         /**
  58         * Constructor
  59         */
  60         public function __construct($mainModule, $moduleName, $modulePrefix = '') {
  61                 $this->mMainModule = $mainModule;
  62                 $this->mModuleName = $moduleName;
  63                 $this->mModulePrefix = $modulePrefix;
  64         }
  65
  66         /*****************************************************************************
  67          * ABSTRACT METHODS                                                          *
  68          *****************************************************************************/
  69
  70         /**
  71          * Evaluates the parameters, performs the requested query, and sets up the
  72          * result. Concrete implementations of ApiBase must override this method to
  73          * provide whatever functionality their module offers. Implementations must
  74          * not produce any output on their own and are not expected to handle any
  75          * errors.
  76          *
  77          * The execute method will be invoked directly by ApiMain immediately before
  78          * the result of the module is output. Aside from the constructor, implementations
  79          * should assume that no other methods will be called externally on the module
  80          * before the result is processed.
  81          *
  82          * The result data should be stored in the result object referred to by
  83          * "getResult()". Refer to ApiResult.php for details on populating a result
  84          * object.
  85          */
  86         public abstract function execute();
  87
  88         /**
  89          * Returns a String that identifies the version of the extending class. Typically
  90          * includes the class name, the svn revision, timestamp, and last author. May
  91          * be severely incorrect in many implementations!
  92          */
  93         public abstract function getVersion();
  94
  95         /**
  96          * Get the name of the module being executed by this instance
  97          */
  98         public function getModuleName() {
  99                 return $this->mModuleName;
 100         }
 101
 102         /**
 103          * Get parameter prefix (usually two letters or an empty string).
 104          */
 105         public function getModulePrefix() {
 106                 return $this->mModulePrefix;
 107         }
 108
 109         /**
 110          * Get the name of the module as shown in the profiler log
 111          */
 112         public function getModuleProfileName($db = false) {
 113                 if ($db)
 114                         return 'API:' . $this->mModuleName . '-DB';
 115                 else
 116                         return 'API:' . $this->mModuleName;
 117         }
 118
 119         /**
 120          * Get main module
 121          */
 122         public function getMain() {
 123                 return $this->mMainModule;
 124         }
 125
 126         /**
 127          * Returns true if this module is the main module ($this === $this->mMainModule),
 128          * false otherwise.
 129          */
 130         public function isMain() {
 131                 return $this === $this->mMainModule;
 132         }
 133
 134         /**
 135          * Get the result object. Please refer to the documentation in ApiResult.php
 136          * for details on populating and accessing data in a result object.
 137          */
 138         public function getResult() {
 139                 // Main module has getResult() method overriden
 140                 // Safety - avoid infinite loop:
 141                 if ($this->isMain())
 142                         ApiBase :: dieDebug(__METHOD__, 'base method was called on main module. ');
 143                 return $this->getMain()->getResult();
 144         }
 145
 146         /**
 147          * Get the result data array
 148          */
 149         public function & getResultData() {
 150                 return $this->getResult()->getData();
 151         }
 152
 153         /**
 154          * Set warning section for this module. Users should monitor this section to
 155          * notice any changes in API.
 156          */
 157         public function setWarning($warning) {
 158                 $msg = array();
 159                 ApiResult :: setContent($msg, $warning);
 160                 $this->getResult()->addValue('warnings', $this->getModuleName(), $msg);
 161         }
 162
 163         /**
 164          * If the module may only be used with a certain format module,
 165          * it should override this method to return an instance of that formatter.
 166          * A value of null means the default format will be used.
 167          */
 168         public function getCustomPrinter() {
 169                 return null;
 170         }
 171
 172         /**
 173          * Generates help message for this module, or false if there is no description
 174          */
 175         public function makeHelpMsg() {
 176
 177                 static $lnPrfx = "\n  ";
 178
 179                 $msg = $this->getDescription();
 180
 181                 if ($msg !== false) {
 182
 183                         if (!is_array($msg))
 184                                 $msg = array (
 185                                         $msg
 186                                 );
 187                         $msg = $lnPrfx . implode($lnPrfx, $msg) . "\n";
 188
 189                         if ($this->mustBePosted())
 190                                 $msg .= "\nThis module only accepts POST requests.\n";
 191
 192                         // Parameters
 193                         $paramsMsg = $this->makeHelpMsgParameters();
 194                         if ($paramsMsg !== false) {
 195                                 $msg .= "Parameters:\n$paramsMsg";
 196                         }
 197
 198                         // Examples
 199                         $examples = $this->getExamples();
 200                         if ($examples !== false) {
 201                                 if (!is_array($examples))
 202                                         $examples = array (
 203                                                 $examples
 204                                         );
 205                                 $msg .= 'Example' . (count($examples) > 1 ? 's' : '') . ":\n  ";
 206                                 $msg .= implode($lnPrfx, $examples) . "\n";
 207                         }
 208
 209                         if ($this->getMain()->getShowVersions()) {
 210                                 $versions = $this->getVersion();
 211                                 $pattern = '(\$.*) ([0-9a-z_]+\.php) (.*\$)';
 212                                 $replacement = '\\0' . "\n    " . 'http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/api/\\2';
 213
 214                                 if (is_array($versions)) {
 215                                         foreach ($versions as &$v)
 216                                                 $v = eregi_replace($pattern, $replacement, $v);
 217                                         $versions = implode("\n  ", $versions);
 218                                 }
 219                                 else
 220                                         $versions = eregi_replace($pattern, $replacement, $versions);
 221
 222                                 $msg .= "Version:\n  $versions\n";
 223                         }
 224                 }
 225
 226                 return $msg;
 227         }
 228
 229         /**
 230          * Generates the parameter descriptions for this module, to be displayed in the
 231          * module's help.
 232          */
 233         public function makeHelpMsgParameters() {
 234                 $params = $this->getAllowedParams();
 235                 if ($params !== false) {
 236
 237                         $paramsDescription = $this->getParamDescription();
 238                         $msg = '';
 239                         $paramPrefix = "\n" . str_repeat(' ', 19);
 240                         foreach ($params as $paramName => $paramSettings) {
 241                                 $desc = isset ($paramsDescription[$paramName]) ? $paramsDescription[$paramName] : '';
 242                                 if (is_array($desc))
 243                                         $desc = implode($paramPrefix, $desc);
 244
 245                                 $type = isset($paramSettings[self :: PARAM_TYPE])? $paramSettings[self :: PARAM_TYPE] : null;
 246                                 if (isset ($type)) {
 247                                         if (isset ($paramSettings[self :: PARAM_ISMULTI]))
 248                                                 $prompt = 'Values (separate with \'|\'): ';
 249                                         else
 250                                                 $prompt = 'One value: ';
 251
 252                                         if (is_array($type)) {
 253                                                 $choices = array();
 254                                                 $nothingPrompt = false;
 255                                                 foreach ($type as $t)
 256                                                         if ($t=='')
 257                                                                 $nothingPrompt = 'Can be empty, or ';
 258                                                         else
 259                                                                 $choices[] =  $t;
 260                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt . implode(', ', $choices);
 261                                         } else {
 262                                                 switch ($type) {
 263                                                         case 'namespace':
 264                                                                 // Special handling because namespaces are type-limited, yet they are not given
 265                                                                 $desc .= $paramPrefix . $prompt . implode(', ', ApiBase :: getValidNamespaces());
 266                                                                 break;
 267                                                         case 'limit':
 268                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]} ({$paramSettings[self :: PARAM_MAX2]} for bots) allowed.";
 269                                                                 break;
 270                                                         case 'integer':
 271                                                                 $hasMin = isset($paramSettings[self :: PARAM_MIN]);
 272                                                                 $hasMax = isset($paramSettings[self :: PARAM_MAX]);
 273                                                                 if ($hasMin || $hasMax) {
 274                                                                         if (!$hasMax)
 275                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self :: PARAM_MIN]}";
 276                                                                         elseif (!$hasMin)
 277                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self :: PARAM_MAX]}";
 278                                                                         else
 279                                                                                 $intRangeStr = "The value must be between {$paramSettings[self :: PARAM_MIN]} and {$paramSettings[self :: PARAM_MAX]}";
 280
 281                                                                         $desc .= $paramPrefix . $intRangeStr;
 282                                                                 }
 283                                                                 break;
 284                                                 }
 285                                         }
 286                                 }
 287
 288                                 $default = is_array($paramSettings) ? (isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null) : $paramSettings;
 289                                 if (!is_null($default) && $default !== false)
 290                                         $desc .= $paramPrefix . "Default: $default";
 291
 292                                 $msg .= sprintf("  %-14s - %s\n", $this->encodeParamName($paramName), $desc);
 293                         }
 294                         return $msg;
 295
 296                 } else
 297                         return false;
 298         }
 299
 300         /**
 301          * Returns the description string for this module
 302          */
 303         protected function getDescription() {
 304                 return false;
 305         }
 306
 307         /**
 308          * Returns usage examples for this module. Return null if no examples are available.
 309          */
 310         protected function getExamples() {
 311                 return false;
 312         }
 313
 314         /**
 315          * Returns an array of allowed parameters (keys) => default value for that parameter
 316          */
 317         protected function getAllowedParams() {
 318                 return false;
 319         }
 320
 321         /**
 322          * Returns the description string for the given parameter.
 323          */
 324         protected function getParamDescription() {
 325                 return false;
 326         }
 327
 328         /**
 329          * This method mangles parameter name based on the prefix supplied to the constructor.
 330          * Override this method to change parameter name during runtime
 331          */
 332         public function encodeParamName($paramName) {
 333                 return $this->mModulePrefix . $paramName;
 334         }
 335
 336         /**
 337         * Using getAllowedParams(), makes an array of the values provided by the user,
 338         * with key being the name of the variable, and value - validated value from user or default.
 339         * This method can be used to generate local variables using extract().
 340         * limit=max will not be parsed if $parseMaxLimit is set to false; use this
 341         * when the max limit is not definite, e.g. when getting revisions.
 342         */
 343         public function extractRequestParams($parseMaxLimit = true) {
 344                 $params = $this->getAllowedParams();
 345                 $results = array ();
 346
 347                 foreach ($params as $paramName => $paramSettings)
 348                         $results[$paramName] = $this->getParameterFromSettings($paramName, $paramSettings, $parseMaxLimit);
 349
 350                 return $results;
 351         }
 352
 353         /**
 354          * Get a value for the given parameter
 355          */
 356         protected function getParameter($paramName) {
 357                 $params = $this->getAllowedParams();
 358                 $paramSettings = $params[$paramName];
 359                 return $this->getParameterFromSettings($paramName, $paramSettings);
 360         }
 361
 362         /**
 363          * Returns an array of the namespaces (by integer id) that exist on the
 364          * wiki. Used primarily in help documentation.
 365          */
 366         public static function getValidNamespaces() {
 367                 static $mValidNamespaces = null;
 368                 if (is_null($mValidNamespaces)) {
 369
 370                         global $wgContLang;
 371                         $mValidNamespaces = array ();
 372                         foreach (array_keys($wgContLang->getNamespaces()) as $ns) {
 373                                 if ($ns >= 0)
 374                                         $mValidNamespaces[] = $ns;
 375                         }
 376                 }
 377                 return $mValidNamespaces;
 378         }
 379
 380         /**
 381          * Using the settings determine the value for the given parameter
 382          *
 383          * @param $paramName String: parameter name
 384          * @param $paramSettings Mixed: default value or an array of settings using PARAM_* constants.
 385          * @param $parseMaxLimit Boolean: parse limit when max is given?
 386          */
 387         protected function getParameterFromSettings($paramName, $paramSettings, $parseMaxLimit) {
 388
 389                 // Some classes may decide to change parameter names
 390                 $encParamName = $this->encodeParamName($paramName);
 391
 392                 if (!is_array($paramSettings)) {
 393                         $default = $paramSettings;
 394                         $multi = false;
 395                         $type = gettype($paramSettings);
 396                 } else {
 397                         $default = isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null;
 398                         $multi = isset ($paramSettings[self :: PARAM_ISMULTI]) ? $paramSettings[self :: PARAM_ISMULTI] : false;
 399                         $type = isset ($paramSettings[self :: PARAM_TYPE]) ? $paramSettings[self :: PARAM_TYPE] : null;
 400
 401                         // When type is not given, and no choices, the type is the same as $default
 402                         if (!isset ($type)) {
 403                                 if (isset ($default))
 404                                         $type = gettype($default);
 405                                 else
 406                                         $type = 'NULL'; // allow everything
 407                         }
 408                 }
 409
 410                 if ($type == 'boolean') {
 411                         if (isset ($default) && $default !== false) {
 412                                 // Having a default value of anything other than 'false' is pointless
 413                                 ApiBase :: dieDebug(__METHOD__, "Boolean param $encParamName's default is set to '$default'");
 414                         }
 415
 416                         $value = $this->getMain()->getRequest()->getCheck($encParamName);
 417                 } else {
 418                         $value = $this->getMain()->getRequest()->getVal($encParamName, $default);
 419
 420                         if (isset ($value) && $type == 'namespace')
 421                                 $type = ApiBase :: getValidNamespaces();
 422                 }
 423
 424                 if (isset ($value) && ($multi || is_array($type)))
 425                         $value = $this->parseMultiValue($encParamName, $value, $multi, is_array($type) ? $type : null);
 426
 427                 // More validation only when choices were not given
 428                 // choices were validated in parseMultiValue()
 429                 if (isset ($value)) {
 430                         if (!is_array($type)) {
 431                                 switch ($type) {
 432                                         case 'NULL' : // nothing to do
 433                                                 break;
 434                                         case 'string' : // nothing to do
 435                                                 break;
 436                                         case 'integer' : // Force everything using intval() and optionally validate limits
 437
 438                                                 $value = is_array($value) ? array_map('intval', $value) : intval($value);
 439                                                 $min = isset ($paramSettings[self :: PARAM_MIN]) ? $paramSettings[self :: PARAM_MIN] : null;
 440                                                 $max = isset ($paramSettings[self :: PARAM_MAX]) ? $paramSettings[self :: PARAM_MAX] : null;
 441
 442                                                 if (!is_null($min) || !is_null($max)) {
 443                                                         $values = is_array($value) ? $value : array($value);
 444                                                         foreach ($values as $v) {
 445                                                                 $this->validateLimit($paramName, $v, $min, $max);
 446                                                         }
 447                                                 }
 448                                                 break;
 449                                         case 'limit' :
 450                                                 if (!isset ($paramSettings[self :: PARAM_MAX]) || !isset ($paramSettings[self :: PARAM_MAX2]))
 451                                                         ApiBase :: dieDebug(__METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName");
 452                                                 if ($multi)
 453                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 454                                                 $min = isset ($paramSettings[self :: PARAM_MIN]) ? $paramSettings[self :: PARAM_MIN] : 0;
 455                                                 if( $value == 'max' ) {
 456                                                         if( $parseMaxLimit ) {
 457                                                                 $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self :: PARAM_MAX2] : $paramSettings[self :: PARAM_MAX];
 458                                                                 $this->getResult()->addValue( 'limits', $this->getModuleName(), $value );
 459                                                                 $this->validateLimit($paramName, $value, $min, $paramSettings[self :: PARAM_MAX], $paramSettings[self :: PARAM_MAX2]);
 460                                                         }
 461                                                 }
 462                                                 else {
 463                                                         $value = intval($value);
 464                                                         $this->validateLimit($paramName, $value, $min, $paramSettings[self :: PARAM_MAX], $paramSettings[self :: PARAM_MAX2]);
 465                                                 }
 466                                                 break;
 467                                         case 'boolean' :
 468                                                 if ($multi)
 469                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 470                                                 break;
 471                                         case 'timestamp' :
 472                                                 if ($multi)
 473                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 474                                                 $value = wfTimestamp(TS_UNIX, $value);
 475                                                 if ($value === 0)
 476                                                         $this->dieUsage("Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}");
 477                                                 $value = wfTimestamp(TS_MW, $value);
 478                                                 break;
 479                                         case 'user' :
 480                                                 $title = Title::makeTitleSafe( NS_USER, $value );
 481                                                 if ( is_null( $title ) )
 482                                                         $this->dieUsage("Invalid value for user parameter $encParamName", "baduser_{$encParamName}");
 483                                                 $value = $title->getText();
 484                                                 break;
 485                                         default :
 486                                                 ApiBase :: dieDebug(__METHOD__, "Param $encParamName's type is unknown - $type");
 487                                 }
 488                         }
 489
 490                         // There should never be any duplicate values in a list
 491                         if (is_array($value))
 492                                 $value = array_unique($value);
 493                 }
 494
 495                 return $value;
 496         }
 497
 498         /**
 499         * Return an array of values that were given in a 'a|b|c' notation,
 500         * after it optionally validates them against the list allowed values.
 501         *
 502         * @param valueName - The name of the parameter (for error reporting)
 503         * @param value - The value being parsed
 504         * @param allowMultiple - Can $value contain more than one value separated by '|'?
 505         * @param allowedValues - An array of values to check against. If null, all values are accepted.
 506         * @return (allowMultiple ? an_array_of_values : a_single_value)
 507         */
 508         protected function parseMultiValue($valueName, $value, $allowMultiple, $allowedValues) {
 509                 if( trim($value) === "" )
 510                         return array();
 511                 $valuesList = explode('|', $value);
 512                 if (!$allowMultiple && count($valuesList) != 1) {
 513                         $possibleValues = is_array($allowedValues) ? "of '" . implode("', '", $allowedValues) . "'" : '';
 514                         $this->dieUsage("Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName");
 515                 }
 516                 if (is_array($allowedValues)) {
 517                         $unknownValues = array_diff($valuesList, $allowedValues);
 518                         if ($unknownValues) {
 519                                 $this->dieUsage('Unrecognised value' . (count($unknownValues) > 1 ? "s" : "") . " for parameter '$valueName'", "unknown_$valueName");
 520                         }
 521                 }
 522
 523                 return $allowMultiple ? $valuesList : $valuesList[0];
 524         }
 525
 526         /**
 527         * Validate the value against the minimum and user/bot maximum limits. Prints usage info on failure.
 528         */
 529         function validateLimit($paramName, $value, $min, $max, $botMax = null) {
 530                 if (!is_null($min) && $value < $min) {
 531                         $this->dieUsage($this->encodeParamName($paramName) . " may not be less than $min (set to $value)", $paramName);
 532                 }
 533
 534                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 535                 if ($this->getMain()->isInternalMode())
 536                         return;
 537
 538                 // Optimization: do not check user's bot status unless really needed -- skips db query
 539                 // assumes $botMax >= $max
 540                 if (!is_null($max) && $value > $max) {
 541                         if (!is_null($botMax) && $this->getMain()->canApiHighLimits()) {
 542                                 if ($value > $botMax) {
 543                                         $this->dieUsage($this->encodeParamName($paramName) . " may not be over $botMax (set to $value) for bots or sysops", $paramName);
 544                                 }
 545                         } else {
 546                                 $this->dieUsage($this->encodeParamName($paramName) . " may not be over $max (set to $value) for users", $paramName);
 547                         }
 548                 }
 549         }
 550
 551         /**
 552          * Call main module's error handler
 553          */
 554         public function dieUsage($description, $errorCode, $httpRespCode = 0) {
 555                 throw new UsageException($description, $this->encodeParamName($errorCode), $httpRespCode);
 556         }
 557
 558         /**
 559          * Array that maps message keys to error messages. $1 and friends are replaced.
 560          */
 561         public static $messageMap = array(
 562                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 563                 'unknownerror' => array('code' => 'unknownerror', 'info' => "Unknown error: ``\$1''"),
 564                 'unknownerror-nocode' => array('code' => 'unknownerror', 'info' => 'Unknown error'),
 565
 566                 // Messages from Title::getUserPermissionsErrors()
 567                 'ns-specialprotected' => array('code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited"),
 568                 'protectedinterface' => array('code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages"),
 569                 'namespaceprotected' => array('code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace"),
 570                 'customcssjsprotected' => array('code' => 'customcssjsprotected', 'info' => "You're not allowed to edit custom CSS and JavaScript pages"),
 571                 'cascadeprotected' => array('code' => 'cascadeprotected', 'info' =>"The page you're trying to edit is protected because it's included in a cascade-protected page"),
 572                 'protectedpagetext' => array('code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page"),
 573                 'protect-cantedit' => array('code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it"),
 574                 'badaccess-group0' => array('code' => 'permissiondenied', 'info' => "Permission denied"), // Generic permission denied message
 575                 'badaccess-group1' => array('code' => 'permissiondenied', 'info' => "Permission denied"), // Can't use the parameter 'cause it's wikilinked
 576                 'badaccess-group2' => array('code' => 'permissiondenied', 'info' => "Permission denied"),
 577                 'badaccess-groups' => array('code' => 'permissiondenied', 'info' => "Permission denied"),
 578                 'titleprotected' => array('code' => 'protectedtitle', 'info' => "This title has been protected from creation"),
 579                 'nocreate-loggedin' => array('code' => 'cantcreate', 'info' => "You don't have permission to create new pages"),
 580                 'nocreatetext' => array('code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages"),
 581                 'movenologintext' => array('code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages"),
 582                 'movenotallowed' => array('code' => 'cantmove', 'info' => "You don't have permission to move pages"),
 583                 'confirmedittext' => array('code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit"),
 584                 'blockedtext' => array('code' => 'blocked', 'info' => "You have been blocked from editing"),
 585                 'autoblockedtext' => array('code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user"),
 586
 587                 // Miscellaneous interface messages
 588                 'actionthrottledtext' => array('code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again"),
 589                 'alreadyrolled' => array('code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back"),
 590                 'cantrollback' => array('code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author"),
 591                 'readonlytext' => array('code' => 'readonly', 'info' => "The wiki is currently in read-only mode"),
 592                 'sessionfailure' => array('code' => 'badtoken', 'info' => "Invalid token"),
 593                 'cannotdelete' => array('code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else"),
 594                 'notanarticle' => array('code' => 'missingtitle', 'info' => "The page you requested doesn't exist"),
 595                 'selfmove' => array('code' => 'selfmove', 'info' => "Can't move a page to itself"),
 596                 'immobile_namespace' => array('code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving"),
 597                 'articleexists' => array('code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article"),
 598                 'protectedpage' => array('code' => 'protectedpage', 'info' => "You don't have permission to perform this move"),
 599                 'hookaborted' => array('code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook"),
 600                 'cantmove-titleprotected' => array('code' => 'protectedtitle', 'info' => "The destination article has been protected from creation"),
 601                 // 'badarticleerror' => shouldn't happen
 602                 // 'badtitletext' => shouldn't happen
 603                 'ip_range_invalid' => array('code' => 'invalidrange', 'info' => "Invalid IP range"),
 604                 'range_block_disabled' => array('code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled"),
 605                 'nosuchusershort' => array('code' => 'nosuchuser', 'info' => "The user you specified doesn't exist"),
 606                 'badipaddress' => array('code' => 'invalidip', 'info' => "Invalid IP address specified"),
 607                 'ipb_expiry_invalid' => array('code' => 'invalidexpiry', 'info' => "Invalid expiry time"),
 608                 'ipb_already_blocked' => array('code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked"),
 609                 '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."),
 610                 'ipb_cant_unblock' => array('code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already"),
 611
 612                 // API-specific messages
 613                 'missingparam' => array('code' => 'no$1', 'info' => "The \$1 parameter must be set"),
 614                 'invalidtitle' => array('code' => 'invalidtitle', 'info' => "Bad title ``\$1''"),
 615                 'invaliduser' => array('code' => 'invaliduser', 'info' => "Invalid username ``\$1''"),
 616                 'invalidexpiry' => array('code' => 'invalidexpiry', 'info' => "Invalid expiry time"),
 617                 'pastexpiry' => array('code' => 'pastexpiry', 'info' => "Expiry time is in the past"),
 618                 'create-titleexists' => array('code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'"),
 619                 'missingtitle-createonly' => array('code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'"),
 620                 'cantblock' => array('code' => 'cantblock', 'info' => "You don't have permission to block users"),
 621                 'canthide' => array('code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log"),
 622                 'cantblock-email' => array('code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki"),
 623                 'unblock-notarget' => array('code' => 'notarget', 'info' => "Either the id or the user parameter must be set"),
 624                 'unblock-idanduser' => array('code' => 'idanduser', 'info' => "The id and user parameters can\'t be used together"),
 625                 'cantunblock' => array('code' => 'permissiondenied', 'info' => "You don't have permission to unblock users"),
 626                 'cannotundelete' => array('code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already"),
 627                 'permdenied-undelete' => array('code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions"),
 628                 'createonly-exists' => array('code' => 'articleexists', 'info' => "The article you tried to create has been created already"),
 629         );
 630
 631         /**
 632          * Output the error message related to a certain array
 633          * @param array $error Element of a getUserPermissionsErrors()
 634          */
 635         public function dieUsageMsg($error) {
 636                 $key = array_shift($error);
 637                 if(isset(self::$messageMap[$key]))
 638                         $this->dieUsage(wfMsgReplaceArgs(self::$messageMap[$key]['info'], $error), wfMsgReplaceArgs(self::$messageMap[$key]['code'], $error));
 639                 // If the key isn't present, throw an "unknown error"
 640                 $this->dieUsageMsg(array('unknownerror', $key));
 641         }
 642
 643         /**
 644          * Internal code errors should be reported with this method
 645          */
 646         protected static function dieDebug($method, $message) {
 647                 wfDebugDieBacktrace("Internal error in $method: $message");
 648         }
 649
 650         /**
 651          * Indicates if API needs to check maxlag
 652          */
 653         public function shouldCheckMaxlag() {
 654                 return true;
 655         }
 656
 657         /**
 658          * Indicates if this module requires edit mode
 659          */
 660         public function isEditMode() {
 661                 return false;
 662         }
 663
 664         /**
 665          * Indicates whether this module must be called with a POST request
 666          */
 667         public function mustBePosted() {
 668                 return false;
 669         }
 670
 671
 672         /**
 673          * Profiling: total module execution time
 674          */
 675         private $mTimeIn = 0, $mModuleTime = 0;
 676
 677         /**
 678          * Start module profiling
 679          */
 680         public function profileIn() {
 681                 if ($this->mTimeIn !== 0)
 682                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileOut()');
 683                 $this->mTimeIn = microtime(true);
 684                 wfProfileIn($this->getModuleProfileName());
 685         }
 686
 687         /**
 688          * End module profiling
 689          */
 690         public function profileOut() {
 691                 if ($this->mTimeIn === 0)
 692                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileIn() first');
 693                 if ($this->mDBTimeIn !== 0)
 694                         ApiBase :: dieDebug(__METHOD__, 'must be called after database profiling is done with profileDBOut()');
 695
 696                 $this->mModuleTime += microtime(true) - $this->mTimeIn;
 697                 $this->mTimeIn = 0;
 698                 wfProfileOut($this->getModuleProfileName());
 699         }
 700
 701         /**
 702          * When modules crash, sometimes it is needed to do a profileOut() regardless
 703          * of the profiling state the module was in. This method does such cleanup.
 704          */
 705         public function safeProfileOut() {
 706                 if ($this->mTimeIn !== 0) {
 707                         if ($this->mDBTimeIn !== 0)
 708                                 $this->profileDBOut();
 709                         $this->profileOut();
 710                 }
 711         }
 712
 713         /**
 714          * Total time the module was executed
 715          */
 716         public function getProfileTime() {
 717                 if ($this->mTimeIn !== 0)
 718                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileOut() first');
 719                 return $this->mModuleTime;
 720         }
 721
 722         /**
 723          * Profiling: database execution time
 724          */
 725         private $mDBTimeIn = 0, $mDBTime = 0;
 726
 727         /**
 728          * Start module profiling
 729          */
 730         public function profileDBIn() {
 731                 if ($this->mTimeIn === 0)
 732                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 733                 if ($this->mDBTimeIn !== 0)
 734                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileDBOut()');
 735                 $this->mDBTimeIn = microtime(true);
 736                 wfProfileIn($this->getModuleProfileName(true));
 737         }
 738
 739         /**
 740          * End database profiling
 741          */
 742         public function profileDBOut() {
 743                 if ($this->mTimeIn === 0)
 744                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 745                 if ($this->mDBTimeIn === 0)
 746                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBIn() first');
 747
 748                 $time = microtime(true) - $this->mDBTimeIn;
 749                 $this->mDBTimeIn = 0;
 750
 751                 $this->mDBTime += $time;
 752                 $this->getMain()->mDBTime += $time;
 753                 wfProfileOut($this->getModuleProfileName(true));
 754         }
 755
 756         /**
 757          * Total time the module used the database
 758          */
 759         public function getProfileDBTime() {
 760                 if ($this->mDBTimeIn !== 0)
 761                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBOut() first');
 762                 return $this->mDBTime;
 763         }
 764
 765         public static function debugPrint($value, $name = 'unknown', $backtrace = false) {
 766                 print "\n\n<pre><b>Debuging value '$name':</b>\n\n";
 767                 var_export($value);
 768                 if ($backtrace)
 769                         print "\n" . wfBacktrace();
 770                 print "\n</pre>\n";
 771         }
 772
 773
 774         /**
 775          * Returns a String that identifies the version of this class.
 776          */
 777         public static function getBaseVersion() {
 778                 return __CLASS__ . ': $Id$';
 779         }
 780 }
 781