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  * @ingroup 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         const PARAM_ALLOW_DUPLICATES = 6;
  50
  51         const LIMIT_BIG1 = 500; // Fast query, std user limit
  52         const LIMIT_BIG2 = 5000; // Fast query, bot/sysop limit
  53         const LIMIT_SML1 = 50; // Slow query, std user limit
  54         const LIMIT_SML2 = 500; // Slow query, bot/sysop limit
  55
  56         private $mMainModule, $mModuleName, $mModulePrefix;
  57
  58         /**
  59         * Constructor
  60         */
  61         public function __construct($mainModule, $moduleName, $modulePrefix = '') {
  62                 $this->mMainModule = $mainModule;
  63                 $this->mModuleName = $moduleName;
  64                 $this->mModulePrefix = $modulePrefix;
  65         }
  66
  67         /*****************************************************************************
  68          * ABSTRACT METHODS                                                          *
  69          *****************************************************************************/
  70
  71         /**
  72          * Evaluates the parameters, performs the requested query, and sets up the
  73          * result. Concrete implementations of ApiBase must override this method to
  74          * provide whatever functionality their module offers. Implementations must
  75          * not produce any output on their own and are not expected to handle any
  76          * errors.
  77          *
  78          * The execute method will be invoked directly by ApiMain immediately before
  79          * the result of the module is output. Aside from the constructor, implementations
  80          * should assume that no other methods will be called externally on the module
  81          * before the result is processed.
  82          *
  83          * The result data should be stored in the result object referred to by
  84          * "getResult()". Refer to ApiResult.php for details on populating a result
  85          * object.
  86          */
  87         public abstract function execute();
  88
  89         /**
  90          * Returns a String that identifies the version of the extending class. Typically
  91          * includes the class name, the svn revision, timestamp, and last author. May
  92          * be severely incorrect in many implementations!
  93          */
  94         public abstract function getVersion();
  95
  96         /**
  97          * Get the name of the module being executed by this instance
  98          */
  99         public function getModuleName() {
 100                 return $this->mModuleName;
 101         }
 102
 103         /**
 104          * Get parameter prefix (usually two letters or an empty string).
 105          */
 106         public function getModulePrefix() {
 107                 return $this->mModulePrefix;
 108         }
 109
 110         /**
 111          * Get the name of the module as shown in the profiler log
 112          */
 113         public function getModuleProfileName($db = false) {
 114                 if ($db)
 115                         return 'API:' . $this->mModuleName . '-DB';
 116                 else
 117                         return 'API:' . $this->mModuleName;
 118         }
 119
 120         /**
 121          * Get main module
 122          */
 123         public function getMain() {
 124                 return $this->mMainModule;
 125         }
 126
 127         /**
 128          * Returns true if this module is the main module ($this === $this->mMainModule),
 129          * false otherwise.
 130          */
 131         public function isMain() {
 132                 return $this === $this->mMainModule;
 133         }
 134
 135         /**
 136          * Get the result object. Please refer to the documentation in ApiResult.php
 137          * for details on populating and accessing data in a result object.
 138          */
 139         public function getResult() {
 140                 // Main module has getResult() method overriden
 141                 // Safety - avoid infinite loop:
 142                 if ($this->isMain())
 143                         ApiBase :: dieDebug(__METHOD__, 'base method was called on main module. ');
 144                 return $this->getMain()->getResult();
 145         }
 146
 147         /**
 148          * Get the result data array
 149          */
 150         public function & getResultData() {
 151                 return $this->getResult()->getData();
 152         }
 153
 154         /**
 155          * Set warning section for this module. Users should monitor this section to
 156          * notice any changes in API.
 157          */
 158         public function setWarning($warning) {
 159                 # If there is a warning already, append it to the existing one
 160                 $data =& $this->getResult()->getData();
 161                 if(isset($data['warnings'][$this->getModuleName()]))
 162                 {
 163                         # Don't add duplicate warnings
 164                         $warn_regex = preg_quote($warning, '/');
 165                         if(preg_match("/{$warn_regex}(\\n|$)/", $data['warnings'][$this->getModuleName()]['*']))
 166                                 return;
 167                         $warning = "{$data['warnings'][$this->getModuleName()]['*']}\n$warning";
 168                         unset($data['warnings'][$this->getModuleName()]);
 169                 }
 170                 $msg = array();
 171                 ApiResult :: setContent($msg, $warning);
 172                 $this->getResult()->addValue('warnings', $this->getModuleName(), $msg);
 173         }
 174
 175         /**
 176          * If the module may only be used with a certain format module,
 177          * it should override this method to return an instance of that formatter.
 178          * A value of null means the default format will be used.
 179          */
 180         public function getCustomPrinter() {
 181                 return null;
 182         }
 183
 184         /**
 185          * Generates help message for this module, or false if there is no description
 186          */
 187         public function makeHelpMsg() {
 188
 189                 static $lnPrfx = "\n  ";
 190
 191                 $msg = $this->getDescription();
 192
 193                 if ($msg !== false) {
 194
 195                         if (!is_array($msg))
 196                                 $msg = array (
 197                                         $msg
 198                                 );
 199                         $msg = $lnPrfx . implode($lnPrfx, $msg) . "\n";
 200
 201                         if ($this->mustBePosted())
 202                                 $msg .= "\nThis module only accepts POST requests.\n";
 203
 204                         // Parameters
 205                         $paramsMsg = $this->makeHelpMsgParameters();
 206                         if ($paramsMsg !== false) {
 207                                 $msg .= "Parameters:\n$paramsMsg";
 208                         }
 209
 210                         // Examples
 211                         $examples = $this->getExamples();
 212                         if ($examples !== false) {
 213                                 if (!is_array($examples))
 214                                         $examples = array (
 215                                                 $examples
 216                                         );
 217                                 $msg .= 'Example' . (count($examples) > 1 ? 's' : '') . ":\n  ";
 218                                 $msg .= implode($lnPrfx, $examples) . "\n";
 219                         }
 220
 221                         if ($this->getMain()->getShowVersions()) {
 222                                 $versions = $this->getVersion();
 223                                 $pattern = '(\$.*) ([0-9a-z_]+\.php) (.*\$)';
 224                                 $replacement = '\\0' . "\n    " . 'http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/api/\\2';
 225
 226                                 if (is_array($versions)) {
 227                                         foreach ($versions as &$v)
 228                                                 $v = eregi_replace($pattern, $replacement, $v);
 229                                         $versions = implode("\n  ", $versions);
 230                                 }
 231                                 else
 232                                         $versions = eregi_replace($pattern, $replacement, $versions);
 233
 234                                 $msg .= "Version:\n  $versions\n";
 235                         }
 236                 }
 237
 238                 return $msg;
 239         }
 240
 241         /**
 242          * Generates the parameter descriptions for this module, to be displayed in the
 243          * module's help.
 244          */
 245         public function makeHelpMsgParameters() {
 246                 $params = $this->getFinalParams();
 247                 if ($params !== false) {
 248
 249                         $paramsDescription = $this->getFinalParamDescription();
 250                         $msg = '';
 251                         $paramPrefix = "\n" . str_repeat(' ', 19);
 252                         foreach ($params as $paramName => $paramSettings) {
 253                                 $desc = isset ($paramsDescription[$paramName]) ? $paramsDescription[$paramName] : '';
 254                                 if (is_array($desc))
 255                                         $desc = implode($paramPrefix, $desc);
 256
 257                                 $type = isset($paramSettings[self :: PARAM_TYPE])? $paramSettings[self :: PARAM_TYPE] : null;
 258                                 if (isset ($type)) {
 259                                         if (isset ($paramSettings[self :: PARAM_ISMULTI]))
 260                                                 $prompt = 'Values (separate with \'|\'): ';
 261                                         else
 262                                                 $prompt = 'One value: ';
 263
 264                                         if (is_array($type)) {
 265                                                 $choices = array();
 266                                                 $nothingPrompt = false;
 267                                                 foreach ($type as $t)
 268                                                         if ($t=='')
 269                                                                 $nothingPrompt = 'Can be empty, or ';
 270                                                         else
 271                                                                 $choices[] =  $t;
 272                                                 $desc .= $paramPrefix . $nothingPrompt . $prompt . implode(', ', $choices);
 273                                         } else {
 274                                                 switch ($type) {
 275                                                         case 'namespace':
 276                                                                 // Special handling because namespaces are type-limited, yet they are not given
 277                                                                 $desc .= $paramPrefix . $prompt . implode(', ', ApiBase :: getValidNamespaces());
 278                                                                 break;
 279                                                         case 'limit':
 280                                                                 $desc .= $paramPrefix . "No more than {$paramSettings[self :: PARAM_MAX]} ({$paramSettings[self :: PARAM_MAX2]} for bots) allowed.";
 281                                                                 break;
 282                                                         case 'integer':
 283                                                                 $hasMin = isset($paramSettings[self :: PARAM_MIN]);
 284                                                                 $hasMax = isset($paramSettings[self :: PARAM_MAX]);
 285                                                                 if ($hasMin || $hasMax) {
 286                                                                         if (!$hasMax)
 287                                                                                 $intRangeStr = "The value must be no less than {$paramSettings[self :: PARAM_MIN]}";
 288                                                                         elseif (!$hasMin)
 289                                                                                 $intRangeStr = "The value must be no more than {$paramSettings[self :: PARAM_MAX]}";
 290                                                                         else
 291                                                                                 $intRangeStr = "The value must be between {$paramSettings[self :: PARAM_MIN]} and {$paramSettings[self :: PARAM_MAX]}";
 292
 293                                                                         $desc .= $paramPrefix . $intRangeStr;
 294                                                                 }
 295                                                                 break;
 296                                                 }
 297                                         }
 298                                 }
 299
 300                                 $default = is_array($paramSettings) ? (isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null) : $paramSettings;
 301                                 if (!is_null($default) && $default !== false)
 302                                         $desc .= $paramPrefix . "Default: $default";
 303
 304                                 $msg .= sprintf("  %-14s - %s\n", $this->encodeParamName($paramName), $desc);
 305                         }
 306                         return $msg;
 307
 308                 } else
 309                         return false;
 310         }
 311
 312         /**
 313          * Returns the description string for this module
 314          */
 315         protected function getDescription() {
 316                 return false;
 317         }
 318
 319         /**
 320          * Returns usage examples for this module. Return null if no examples are available.
 321          */
 322         protected function getExamples() {
 323                 return false;
 324         }
 325
 326         /**
 327          * Returns an array of allowed parameters (keys) => default value for that parameter.
 328          * Don't call this function directly: use getFinalParams() to allow hooks
 329          * to modify parameters as needed.
 330          */
 331         protected function getAllowedParams() {
 332                 return false;
 333         }
 334
 335         /**
 336          * Returns an array of parameter descriptions.
 337          * Don't call this functon directly: use getFinalParamDescription() to allow
 338          * hooks to modify descriptions as needed.
 339          */
 340         protected function getParamDescription() {
 341                 return false;
 342         }
 343
 344         /**
 345          * Get final list of parameters, after hooks have had
 346          * a chance to tweak it as needed.
 347          */
 348         public function getFinalParams() {
 349                 $params = $this->getAllowedParams();
 350                 wfRunHooks('APIGetAllowedParams', array(&$this, &$params));
 351                 return $params;
 352         }
 353
 354
 355         public function getFinalParamDescription() {
 356                 $desc = $this->getParamDescription();
 357                 wfRunHooks('APIGetParamDescription', array(&$this, &$desc));
 358                 return $desc;
 359         }
 360
 361         /**
 362          * This method mangles parameter name based on the prefix supplied to the constructor.
 363          * Override this method to change parameter name during runtime
 364          */
 365         public function encodeParamName($paramName) {
 366                 return $this->mModulePrefix . $paramName;
 367         }
 368
 369         /**
 370         * Using getAllowedParams(), makes an array of the values provided by the user,
 371         * with key being the name of the variable, and value - validated value from user or default.
 372         * This method can be used to generate local variables using extract().
 373         * limit=max will not be parsed if $parseMaxLimit is set to false; use this
 374         * when the max limit is not definite, e.g. when getting revisions.
 375         */
 376         public function extractRequestParams($parseMaxLimit = true) {
 377                 $params = $this->getFinalParams();
 378                 $results = array ();
 379
 380                 foreach ($params as $paramName => $paramSettings)
 381                         $results[$paramName] = $this->getParameterFromSettings($paramName, $paramSettings, $parseMaxLimit);
 382
 383                 return $results;
 384         }
 385
 386         /**
 387          * Get a value for the given parameter
 388          */
 389         protected function getParameter($paramName, $parseMaxLimit = true) {
 390                 $params = $this->getFinalParams();
 391                 $paramSettings = $params[$paramName];
 392                 return $this->getParameterFromSettings($paramName, $paramSettings, $parseMaxLimit);
 393         }
 394
 395         /**
 396          * Die if none or more than one of a certain set of parameters is set
 397          */
 398         public function requireOnlyOneParameter($params) {
 399                 $required = func_get_args();
 400                 array_shift($required);
 401
 402                 $intersection = array_intersect(array_keys(array_filter($params,
 403                                 create_function('$x', 'return !is_null($x);')
 404                         )), $required);
 405                 if (count($intersection) > 1) {
 406                         $this->dieUsage('The parameters '.implode(', ', $intersection).' can not be used together', 'invalidparammix');
 407                 } elseif (count($intersection) == 0) {
 408                         $this->dieUsage('One of the parameters '.implode(', ', $required).' is required', 'missingparam');
 409                 }
 410         }
 411
 412         /**
 413          * Returns an array of the namespaces (by integer id) that exist on the
 414          * wiki. Used primarily in help documentation.
 415          */
 416         public static function getValidNamespaces() {
 417                 static $mValidNamespaces = null;
 418                 if (is_null($mValidNamespaces)) {
 419
 420                         global $wgContLang;
 421                         $mValidNamespaces = array ();
 422                         foreach (array_keys($wgContLang->getNamespaces()) as $ns) {
 423                                 if ($ns >= 0)
 424                                         $mValidNamespaces[] = $ns;
 425                         }
 426                 }
 427                 return $mValidNamespaces;
 428         }
 429
 430         /**
 431          * Using the settings determine the value for the given parameter
 432          *
 433          * @param $paramName String: parameter name
 434          * @param $paramSettings Mixed: default value or an array of settings using PARAM_* constants.
 435          * @param $parseMaxLimit Boolean: parse limit when max is given?
 436          */
 437         protected function getParameterFromSettings($paramName, $paramSettings, $parseMaxLimit) {
 438
 439                 // Some classes may decide to change parameter names
 440                 $encParamName = $this->encodeParamName($paramName);
 441
 442                 if (!is_array($paramSettings)) {
 443                         $default = $paramSettings;
 444                         $multi = false;
 445                         $type = gettype($paramSettings);
 446                         $dupes = false;
 447                 } else {
 448                         $default = isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null;
 449                         $multi = isset ($paramSettings[self :: PARAM_ISMULTI]) ? $paramSettings[self :: PARAM_ISMULTI] : false;
 450                         $type = isset ($paramSettings[self :: PARAM_TYPE]) ? $paramSettings[self :: PARAM_TYPE] : null;
 451                         $dupes = isset ($paramSettings[self:: PARAM_ALLOW_DUPLICATES]) ? $paramSettings[self :: PARAM_ALLOW_DUPLICATES] : false;
 452
 453                         // When type is not given, and no choices, the type is the same as $default
 454                         if (!isset ($type)) {
 455                                 if (isset ($default))
 456                                         $type = gettype($default);
 457                                 else
 458                                         $type = 'NULL'; // allow everything
 459                         }
 460                 }
 461
 462                 if ($type == 'boolean') {
 463                         if (isset ($default) && $default !== false) {
 464                                 // Having a default value of anything other than 'false' is pointless
 465                                 ApiBase :: dieDebug(__METHOD__, "Boolean param $encParamName's default is set to '$default'");
 466                         }
 467
 468                         $value = $this->getMain()->getRequest()->getCheck($encParamName);
 469                 } else {
 470                         $value = $this->getMain()->getRequest()->getVal($encParamName, $default);
 471
 472                         if (isset ($value) && $type == 'namespace')
 473                                 $type = ApiBase :: getValidNamespaces();
 474                 }
 475
 476                 if (isset ($value) && ($multi || is_array($type)))
 477                         $value = $this->parseMultiValue($encParamName, $value, $multi, is_array($type) ? $type : null);
 478
 479                 // More validation only when choices were not given
 480                 // choices were validated in parseMultiValue()
 481                 if (isset ($value)) {
 482                         if (!is_array($type)) {
 483                                 switch ($type) {
 484                                         case 'NULL' : // nothing to do
 485                                                 break;
 486                                         case 'string' : // nothing to do
 487                                                 break;
 488                                         case 'integer' : // Force everything using intval() and optionally validate limits
 489
 490                                                 $value = is_array($value) ? array_map('intval', $value) : intval($value);
 491                                                 $min = isset ($paramSettings[self :: PARAM_MIN]) ? $paramSettings[self :: PARAM_MIN] : null;
 492                                                 $max = isset ($paramSettings[self :: PARAM_MAX]) ? $paramSettings[self :: PARAM_MAX] : null;
 493
 494                                                 if (!is_null($min) || !is_null($max)) {
 495                                                         $values = is_array($value) ? $value : array($value);
 496                                                         foreach ($values as $v) {
 497                                                                 $this->validateLimit($paramName, $v, $min, $max);
 498                                                         }
 499                                                 }
 500                                                 break;
 501                                         case 'limit' :
 502                                                 if (!isset ($paramSettings[self :: PARAM_MAX]) || !isset ($paramSettings[self :: PARAM_MAX2]))
 503                                                         ApiBase :: dieDebug(__METHOD__, "MAX1 or MAX2 are not defined for the limit $encParamName");
 504                                                 if ($multi)
 505                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 506                                                 $min = isset ($paramSettings[self :: PARAM_MIN]) ? $paramSettings[self :: PARAM_MIN] : 0;
 507                                                 if( $value == 'max' ) {
 508                                                         if( $parseMaxLimit ) {
 509                                                                 $value = $this->getMain()->canApiHighLimits() ? $paramSettings[self :: PARAM_MAX2] : $paramSettings[self :: PARAM_MAX];
 510                                                                 $this->getResult()->addValue( 'limits', $this->getModuleName(), $value );
 511                                                                 $this->validateLimit($paramName, $value, $min, $paramSettings[self :: PARAM_MAX], $paramSettings[self :: PARAM_MAX2]);
 512                                                         }
 513                                                 }
 514                                                 else {
 515                                                         $value = intval($value);
 516                                                         $this->validateLimit($paramName, $value, $min, $paramSettings[self :: PARAM_MAX], $paramSettings[self :: PARAM_MAX2]);
 517                                                 }
 518                                                 break;
 519                                         case 'boolean' :
 520                                                 if ($multi)
 521                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 522                                                 break;
 523                                         case 'timestamp' :
 524                                                 if ($multi)
 525                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $encParamName");
 526                                                 $value = wfTimestamp(TS_UNIX, $value);
 527                                                 if ($value === 0)
 528                                                         $this->dieUsage("Invalid value '$value' for timestamp parameter $encParamName", "badtimestamp_{$encParamName}");
 529                                                 $value = wfTimestamp(TS_MW, $value);
 530                                                 break;
 531                                         case 'user' :
 532                                                 $title = Title::makeTitleSafe( NS_USER, $value );
 533                                                 if ( is_null( $title ) )
 534                                                         $this->dieUsage("Invalid value for user parameter $encParamName", "baduser_{$encParamName}");
 535                                                 $value = $title->getText();
 536                                                 break;
 537                                         default :
 538                                                 ApiBase :: dieDebug(__METHOD__, "Param $encParamName's type is unknown - $type");
 539                                 }
 540                         }
 541
 542                         // Throw out duplicates if requested
 543                         if (is_array($value) && !$dupes)
 544                                 $value = array_unique($value);
 545                 }
 546
 547                 return $value;
 548         }
 549
 550         /**
 551         * Return an array of values that were given in a 'a|b|c' notation,
 552         * after it optionally validates them against the list allowed values.
 553         *
 554         * @param valueName - The name of the parameter (for error reporting)
 555         * @param value - The value being parsed
 556         * @param allowMultiple - Can $value contain more than one value separated by '|'?
 557         * @param allowedValues - An array of values to check against. If null, all values are accepted.
 558         * @return (allowMultiple ? an_array_of_values : a_single_value)
 559         */
 560         protected function parseMultiValue($valueName, $value, $allowMultiple, $allowedValues) {
 561                 if( trim($value) === "" )
 562                         return array();
 563                 $sizeLimit = $this->mMainModule->canApiHighLimits() ? self::LIMIT_SML2 : self::LIMIT_SML1;
 564                 $valuesList = explode('|', $value, $sizeLimit + 1);
 565                 if( count($valuesList) == $sizeLimit + 1 ) {
 566                         $junk = array_pop($valuesList); // kill last jumbled param
 567                         // Set a warning too
 568                         $this->setWarning("Too many values supplied for parameter '$valueName': the limit is $sizeLimit");
 569                 }
 570                 if (!$allowMultiple && count($valuesList) != 1) {
 571                         $possibleValues = is_array($allowedValues) ? "of '" . implode("', '", $allowedValues) . "'" : '';
 572                         $this->dieUsage("Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName");
 573                 }
 574                 if (is_array($allowedValues)) {
 575                         # Check for unknown values
 576                         $unknown = array_diff($valuesList, $allowedValues);
 577                         if(!empty($unknown))
 578                         {
 579                                 if($allowMultiple)
 580                                 {
 581                                         $s = count($unknown) > 1 ? "s" : "";
 582                                         $vals = implode(", ", $unknown);
 583                                         $this->setWarning("Unrecognized value$s for parameter '$valueName': $vals");
 584                                 }
 585                                 else
 586                                         $this->dieUsage("Unrecognized value for parameter '$valueName': {$valuesList[0]}", "unknown_$valueName");
 587                         }
 588                         # Now throw them out
 589                         $valuesList = array_intersect($valuesList, $allowedValues);
 590                 }
 591
 592                 return $allowMultiple ? $valuesList : $valuesList[0];
 593         }
 594
 595         /**
 596         * Validate the value against the minimum and user/bot maximum limits. Prints usage info on failure.
 597         */
 598         function validateLimit($paramName, $value, $min, $max, $botMax = null) {
 599                 if (!is_null($min) && $value < $min) {
 600                         $this->dieUsage($this->encodeParamName($paramName) . " may not be less than $min (set to $value)", $paramName);
 601                 }
 602
 603                 // Minimum is always validated, whereas maximum is checked only if not running in internal call mode
 604                 if ($this->getMain()->isInternalMode())
 605                         return;
 606
 607                 // Optimization: do not check user's bot status unless really needed -- skips db query
 608                 // assumes $botMax >= $max
 609                 if (!is_null($max) && $value > $max) {
 610                         if (!is_null($botMax) && $this->getMain()->canApiHighLimits()) {
 611                                 if ($value > $botMax) {
 612                                         $this->dieUsage($this->encodeParamName($paramName) . " may not be over $botMax (set to $value) for bots or sysops", $paramName);
 613                                 }
 614                         } else {
 615                                 $this->dieUsage($this->encodeParamName($paramName) . " may not be over $max (set to $value) for users", $paramName);
 616                         }
 617                 }
 618         }
 619
 620         /**
 621          * Call main module's error handler
 622          */
 623         public function dieUsage($description, $errorCode, $httpRespCode = 0) {
 624                 throw new UsageException($description, $this->encodeParamName($errorCode), $httpRespCode);
 625         }
 626
 627         /**
 628          * Array that maps message keys to error messages. $1 and friends are replaced.
 629          */
 630         public static $messageMap = array(
 631                 // This one MUST be present, or dieUsageMsg() will recurse infinitely
 632                 'unknownerror' => array('code' => 'unknownerror', 'info' => "Unknown error: ``\$1''"),
 633                 'unknownerror-nocode' => array('code' => 'unknownerror', 'info' => 'Unknown error'),
 634
 635                 // Messages from Title::getUserPermissionsErrors()
 636                 'ns-specialprotected' => array('code' => 'unsupportednamespace', 'info' => "Pages in the Special namespace can't be edited"),
 637                 'protectedinterface' => array('code' => 'protectednamespace-interface', 'info' => "You're not allowed to edit interface messages"),
 638                 'namespaceprotected' => array('code' => 'protectednamespace', 'info' => "You're not allowed to edit pages in the ``\$1'' namespace"),
 639                 'customcssjsprotected' => array('code' => 'customcssjsprotected', 'info' => "You're not allowed to edit custom CSS and JavaScript pages"),
 640                 'cascadeprotected' => array('code' => 'cascadeprotected', 'info' =>"The page you're trying to edit is protected because it's included in a cascade-protected page"),
 641                 'protectedpagetext' => array('code' => 'protectedpage', 'info' => "The ``\$1'' right is required to edit this page"),
 642                 'protect-cantedit' => array('code' => 'cantedit', 'info' => "You can't protect this page because you can't edit it"),
 643                 'badaccess-group0' => array('code' => 'permissiondenied', 'info' => "Permission denied"), // Generic permission denied message
 644                 'badaccess-groups' => array('code' => 'permissiondenied', 'info' => "Permission denied"),
 645                 'titleprotected' => array('code' => 'protectedtitle', 'info' => "This title has been protected from creation"),
 646                 'nocreate-loggedin' => array('code' => 'cantcreate', 'info' => "You don't have permission to create new pages"),
 647                 'nocreatetext' => array('code' => 'cantcreate-anon', 'info' => "Anonymous users can't create new pages"),
 648                 'movenologintext' => array('code' => 'cantmove-anon', 'info' => "Anonymous users can't move pages"),
 649                 'movenotallowed' => array('code' => 'cantmove', 'info' => "You don't have permission to move pages"),
 650                 'confirmedittext' => array('code' => 'confirmemail', 'info' => "You must confirm your e-mail address before you can edit"),
 651                 'blockedtext' => array('code' => 'blocked', 'info' => "You have been blocked from editing"),
 652                 'autoblockedtext' => array('code' => 'autoblocked', 'info' => "Your IP address has been blocked automatically, because it was used by a blocked user"),
 653
 654                 // Miscellaneous interface messages
 655                 'actionthrottledtext' => array('code' => 'ratelimited', 'info' => "You've exceeded your rate limit. Please wait some time and try again"),
 656                 'alreadyrolled' => array('code' => 'alreadyrolled', 'info' => "The page you tried to rollback was already rolled back"),
 657                 'cantrollback' => array('code' => 'onlyauthor', 'info' => "The page you tried to rollback only has one author"),
 658                 'readonlytext' => array('code' => 'readonly', 'info' => "The wiki is currently in read-only mode"),
 659                 'sessionfailure' => array('code' => 'badtoken', 'info' => "Invalid token"),
 660                 'cannotdelete' => array('code' => 'cantdelete', 'info' => "Couldn't delete ``\$1''. Maybe it was deleted already by someone else"),
 661                 'notanarticle' => array('code' => 'missingtitle', 'info' => "The page you requested doesn't exist"),
 662                 'selfmove' => array('code' => 'selfmove', 'info' => "Can't move a page to itself"),
 663                 'immobile_namespace' => array('code' => 'immobilenamespace', 'info' => "You tried to move pages from or to a namespace that is protected from moving"),
 664                 'articleexists' => array('code' => 'articleexists', 'info' => "The destination article already exists and is not a redirect to the source article"),
 665                 'protectedpage' => array('code' => 'protectedpage', 'info' => "You don't have permission to perform this move"),
 666                 'hookaborted' => array('code' => 'hookaborted', 'info' => "The modification you tried to make was aborted by an extension hook"),
 667                 'cantmove-titleprotected' => array('code' => 'protectedtitle', 'info' => "The destination article has been protected from creation"),
 668                 'imagenocrossnamespace' => array('code' => 'nonfilenamespace', 'info' => "Can't move a file to a non-file namespace"),
 669                 'imagetypemismatch' => array('code' => 'filetypemismatch', 'info' => "The new file extension doesn't match its type"),
 670                 // 'badarticleerror' => shouldn't happen
 671                 // 'badtitletext' => shouldn't happen
 672                 'ip_range_invalid' => array('code' => 'invalidrange', 'info' => "Invalid IP range"),
 673                 'range_block_disabled' => array('code' => 'rangedisabled', 'info' => "Blocking IP ranges has been disabled"),
 674                 'nosuchusershort' => array('code' => 'nosuchuser', 'info' => "The user you specified doesn't exist"),
 675                 'badipaddress' => array('code' => 'invalidip', 'info' => "Invalid IP address specified"),
 676                 'ipb_expiry_invalid' => array('code' => 'invalidexpiry', 'info' => "Invalid expiry time"),
 677                 'ipb_already_blocked' => array('code' => 'alreadyblocked', 'info' => "The user you tried to block was already blocked"),
 678                 '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."),
 679                 'ipb_cant_unblock' => array('code' => 'cantunblock', 'info' => "The block you specified was not found. It may have been unblocked already"),
 680                 'mailnologin' => array('code' => 'cantsend', 'info' => "You're not logged in or you don't have a confirmed e-mail address, so you can't send e-mail"),
 681                 'usermaildisabled' => array('code' => 'usermaildisabled', 'info' => "User email has been disabled"),
 682                 'blockedemailuser' => array('code' => 'blockedfrommail', 'info' => "You have been blocked from sending e-mail"),
 683                 'notarget' => array('code' => 'notarget', 'info' => "You have not specified a valid target for this action"),
 684                 '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"),
 685                 'rcpatroldisabled' => array('code' => 'patroldisabled', 'info' => "Patrolling is disabled on this wiki"),
 686                 'markedaspatrollederror-noautopatrol' => array('code' => 'noautopatrol', 'info' => "You don't have permission to patrol your own changes"),
 687
 688                 // API-specific messages
 689                 'missingparam' => array('code' => 'no$1', 'info' => "The \$1 parameter must be set"),
 690                 'invalidtitle' => array('code' => 'invalidtitle', 'info' => "Bad title ``\$1''"),
 691                 'nosuchpageid' => array('code' => 'nosuchpageid', 'info' => "There is no page with ID \$1"),
 692                 'invaliduser' => array('code' => 'invaliduser', 'info' => "Invalid username ``\$1''"),
 693                 'invalidexpiry' => array('code' => 'invalidexpiry', 'info' => "Invalid expiry time ``\$1''"),
 694                 'pastexpiry' => array('code' => 'pastexpiry', 'info' => "Expiry time ``\$1'' is in the past"),
 695                 'create-titleexists' => array('code' => 'create-titleexists', 'info' => "Existing titles can't be protected with 'create'"),
 696                 'missingtitle-createonly' => array('code' => 'missingtitle-createonly', 'info' => "Missing titles can only be protected with 'create'"),
 697                 'cantblock' => array('code' => 'cantblock', 'info' => "You don't have permission to block users"),
 698                 'canthide' => array('code' => 'canthide', 'info' => "You don't have permission to hide user names from the block log"),
 699                 'cantblock-email' => array('code' => 'cantblock-email', 'info' => "You don't have permission to block users from sending e-mail through the wiki"),
 700                 'unblock-notarget' => array('code' => 'notarget', 'info' => "Either the id or the user parameter must be set"),
 701                 'unblock-idanduser' => array('code' => 'idanduser', 'info' => "The id and user parameters can't be used together"),
 702                 'cantunblock' => array('code' => 'permissiondenied', 'info' => "You don't have permission to unblock users"),
 703                 'cannotundelete' => array('code' => 'cantundelete', 'info' => "Couldn't undelete: the requested revisions may not exist, or may have been undeleted already"),
 704                 'permdenied-undelete' => array('code' => 'permissiondenied', 'info' => "You don't have permission to restore deleted revisions"),
 705                 'createonly-exists' => array('code' => 'articleexists', 'info' => "The article you tried to create has been created already"),
 706                 'nocreate-missing' => array('code' => 'missingtitle', 'info' => "The article you tried to edit doesn't exist"),
 707                 'nosuchrcid' => array('code' => 'nosuchrcid', 'info' => "There is no change with rcid ``\$1''"),
 708                 'cantpurge' => array('code' => 'cantpurge', 'info' => "Only users with the 'purge' right can purge pages via the API"),
 709                 'protect-invalidaction' => array('code' => 'protect-invalidaction', 'info' => "Invalid protection type ``\$1''"),
 710                 'protect-invalidlevel' => array('code' => 'protect-invalidlevel', 'info' => "Invalid protection level ``\$1''"),
 711                 'toofewexpiries' => array('code' => 'toofewexpiries', 'info' => "\$1 expiry timestamps were provided where \$2 were needed"),
 712
 713
 714                 // ApiEditPage messages
 715                 'noimageredirect-anon' => array('code' => 'noimageredirect-anon', 'info' => "Anonymous users can't create image redirects"),
 716                 'noimageredirect-logged' => array('code' => 'noimageredirect', 'info' => "You don't have permission to create image redirects"),
 717                 'spamdetected' => array('code' => 'spamdetected', 'info' => "Your edit was refused because it contained a spam fragment: ``\$1''"),
 718                 'filtered' => array('code' => 'filtered', 'info' => "The filter callback function refused your edit"),
 719                 'contenttoobig' => array('code' => 'contenttoobig', 'info' => "The content you supplied exceeds the article size limit of \$1 bytes"),
 720                 'noedit-anon' => array('code' => 'noedit-anon', 'info' => "Anonymous users can't edit pages"),
 721                 'noedit' => array('code' => 'noedit', 'info' => "You don't have permission to edit pages"),
 722                 'wasdeleted' => array('code' => 'pagedeleted', 'info' => "The page has been deleted since you fetched its timestamp"),
 723                 'blankpage' => array('code' => 'emptypage', 'info' => "Creating new, empty pages is not allowed"),
 724                 'editconflict' => array('code' => 'editconflict', 'info' => "Edit conflict detected"),
 725                 'hashcheckfailed' => array('code' => 'badmd5', 'info' => "The supplied MD5 hash was incorrect"),
 726                 'missingtext' => array('code' => 'notext', 'info' => "One of the text, appendtext and prependtext parameters must be set"),
 727                 'emptynewsection' => array('code' => 'emptynewsection', 'info' => 'Creating empty new sections is not possible.'),
 728         );
 729
 730         /**
 731          * Output the error message related to a certain array
 732          * @param array $error Element of a getUserPermissionsErrors()
 733          */
 734         public function dieUsageMsg($error) {
 735                 $key = array_shift($error);
 736                 if(isset(self::$messageMap[$key]))
 737                         $this->dieUsage(wfMsgReplaceArgs(self::$messageMap[$key]['info'], $error), wfMsgReplaceArgs(self::$messageMap[$key]['code'], $error));
 738                 // If the key isn't present, throw an "unknown error"
 739                 $this->dieUsageMsg(array('unknownerror', $key));
 740         }
 741
 742         /**
 743          * Internal code errors should be reported with this method
 744          */
 745         protected static function dieDebug($method, $message) {
 746                 wfDebugDieBacktrace("Internal error in $method: $message");
 747         }
 748
 749         /**
 750          * Indicates if API needs to check maxlag
 751          */
 752         public function shouldCheckMaxlag() {
 753                 return true;
 754         }
 755
 756         /**
 757          * Indicates if this module requires edit mode
 758          */
 759         public function isEditMode() {
 760                 return false;
 761         }
 762
 763         /**
 764          * Indicates whether this module must be called with a POST request
 765          */
 766         public function mustBePosted() {
 767                 return false;
 768         }
 769
 770
 771         /**
 772          * Profiling: total module execution time
 773          */
 774         private $mTimeIn = 0, $mModuleTime = 0;
 775
 776         /**
 777          * Start module profiling
 778          */
 779         public function profileIn() {
 780                 if ($this->mTimeIn !== 0)
 781                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileOut()');
 782                 $this->mTimeIn = microtime(true);
 783                 wfProfileIn($this->getModuleProfileName());
 784         }
 785
 786         /**
 787          * End module profiling
 788          */
 789         public function profileOut() {
 790                 if ($this->mTimeIn === 0)
 791                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileIn() first');
 792                 if ($this->mDBTimeIn !== 0)
 793                         ApiBase :: dieDebug(__METHOD__, 'must be called after database profiling is done with profileDBOut()');
 794
 795                 $this->mModuleTime += microtime(true) - $this->mTimeIn;
 796                 $this->mTimeIn = 0;
 797                 wfProfileOut($this->getModuleProfileName());
 798         }
 799
 800         /**
 801          * When modules crash, sometimes it is needed to do a profileOut() regardless
 802          * of the profiling state the module was in. This method does such cleanup.
 803          */
 804         public function safeProfileOut() {
 805                 if ($this->mTimeIn !== 0) {
 806                         if ($this->mDBTimeIn !== 0)
 807                                 $this->profileDBOut();
 808                         $this->profileOut();
 809                 }
 810         }
 811
 812         /**
 813          * Total time the module was executed
 814          */
 815         public function getProfileTime() {
 816                 if ($this->mTimeIn !== 0)
 817                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileOut() first');
 818                 return $this->mModuleTime;
 819         }
 820
 821         /**
 822          * Profiling: database execution time
 823          */
 824         private $mDBTimeIn = 0, $mDBTime = 0;
 825
 826         /**
 827          * Start module profiling
 828          */
 829         public function profileDBIn() {
 830                 if ($this->mTimeIn === 0)
 831                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 832                 if ($this->mDBTimeIn !== 0)
 833                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileDBOut()');
 834                 $this->mDBTimeIn = microtime(true);
 835                 wfProfileIn($this->getModuleProfileName(true));
 836         }
 837
 838         /**
 839          * End database profiling
 840          */
 841         public function profileDBOut() {
 842                 if ($this->mTimeIn === 0)
 843                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 844                 if ($this->mDBTimeIn === 0)
 845                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBIn() first');
 846
 847                 $time = microtime(true) - $this->mDBTimeIn;
 848                 $this->mDBTimeIn = 0;
 849
 850                 $this->mDBTime += $time;
 851                 $this->getMain()->mDBTime += $time;
 852                 wfProfileOut($this->getModuleProfileName(true));
 853         }
 854
 855         /**
 856          * Total time the module used the database
 857          */
 858         public function getProfileDBTime() {
 859                 if ($this->mDBTimeIn !== 0)
 860                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBOut() first');
 861                 return $this->mDBTime;
 862         }
 863
 864         public static function debugPrint($value, $name = 'unknown', $backtrace = false) {
 865                 print "\n\n<pre><b>Debuging value '$name':</b>\n\n";
 866                 var_export($value);
 867                 if ($backtrace)
 868                         print "\n" . wfBacktrace();
 869                 print "\n</pre>\n";
 870         }
 871
 872
 873         /**
 874          * Returns a String that identifies the version of this class.
 875          */
 876         public static function getBaseVersion() {
 877                 return __CLASS__ . ': $Id$';
 878         }
 879 }