includes/api/ApiBase.php

   1 <?php
   2
   3
   4 /*
   5  * Created on Sep 5, 2006
   6  *
   7  * API for MediaWiki 1.8+
   8  *
   9  * Copyright (C) 2006 Yuri Astrakhan <FirstnameLastname@gmail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  * http://www.gnu.org/copyleft/gpl.html
  25  */
  26
  27 abstract class ApiBase {
  28
  29         // These constants allow modules to specify exactly how to treat incomming parameters.
  30
  31         const PARAM_DFLT = 0;
  32         const PARAM_ISMULTI = 1;
  33         const PARAM_TYPE = 2;
  34         const PARAM_MAX1 = 3;
  35         const PARAM_MAX2 = 4;
  36         const PARAM_MIN = 5;
  37
  38         const LIMIT_BIG1 = 500; // Fast query, user's limit
  39         const LIMIT_BIG2 = 5000; // Fast query, bot's limit
  40         const LIMIT_SML1 = 50; // Slow query, user's limit
  41         const LIMIT_SML2 = 500; // Slow query, bot's limit
  42
  43         private $mMainModule, $mModuleName, $mParamPrefix;
  44
  45         /**
  46         * Constructor
  47         */
  48         public function __construct($mainModule, $moduleName, $paramPrefix = '') {
  49                 $this->mMainModule = $mainModule;
  50                 $this->mModuleName = $moduleName;
  51                 $this->mParamPrefix = $paramPrefix;
  52         }
  53
  54         /**
  55          * Executes this module
  56          */
  57         public abstract function execute();
  58
  59         /**
  60          * Get the name of the module being executed by this instance
  61          */
  62         public function getModuleName() {
  63                 return $this->mModuleName;
  64         }
  65
  66         /**
  67          * Get the name of the module as shown in the profiler log
  68          */
  69         public function getModuleProfileName($db = false) {
  70                 if ($db)
  71                         return 'API:' . $this->mModuleName . '-DB';
  72                 else
  73                         return 'API:' . $this->mModuleName;
  74         }
  75
  76         /**
  77          * Get main module
  78          */
  79         public function getMain() {
  80                 return $this->mMainModule;
  81         }
  82
  83         /**
  84          * If this module's $this is the same as $this->mMainModule, its the root, otherwise no
  85          */
  86         public function isMain() {
  87                 return $this === $this->mMainModule;
  88         }
  89
  90         /**
  91          * Get result object
  92          */
  93         public function getResult() {
  94                 // Main module has getResult() method overriden
  95                 // Safety - avoid infinite loop:
  96                 if ($this->isMain())
  97                         ApiBase :: dieDebug(__METHOD__, 'base method was called on main module. ');
  98                 return $this->getMain()->getResult();
  99         }
 100
 101         /**
 102          * Get the result data array
 103          */
 104         public function & getResultData() {
 105                 return $this->getResult()->getData();
 106         }
 107
 108         /**
 109          * If the module may only be used with a certain format module,
 110          * it should override this method to return an instance of that formatter.
 111          * A value of null means the default format will be used.
 112          */
 113         public function getCustomPrinter() {
 114                 return null;
 115         }
 116
 117         /**
 118          * Generates help message for this module, or false if there is no description
 119          */
 120         public function makeHelpMsg() {
 121
 122                 static $lnPrfx = "\n  ";
 123
 124                 $msg = $this->getDescription();
 125
 126                 if ($msg !== false) {
 127
 128                         if (!is_array($msg))
 129                                 $msg = array (
 130                                         $msg
 131                                 );
 132                         $msg = $lnPrfx . implode($lnPrfx, $msg) . "\n";
 133
 134                         // Parameters
 135                         $paramsMsg = $this->makeHelpMsgParameters();
 136                         if ($paramsMsg !== false) {
 137                                 $msg .= "Parameters:\n$paramsMsg";
 138                         }
 139
 140                         // Examples
 141                         $examples = $this->getExamples();
 142                         if ($examples !== false) {
 143                                 if (!is_array($examples))
 144                                         $examples = array (
 145                                                 $examples
 146                                         );
 147                                 $msg .= 'Example' . (count($examples) > 1 ? 's' : '') . ":\n  ";
 148                                 $msg .= implode($lnPrfx, $examples) . "\n";
 149                         }
 150
 151                         if ($this->getMain()->getShowVersions()) {
 152                                 $versions = $this->getVersion();
 153                                 if (is_array($versions))
 154                                         $versions = implode("\n  ", $versions);
 155                                 $msg .= "Version:\n  $versions\n";
 156                         }
 157                 }
 158
 159                 return $msg;
 160         }
 161
 162         public function makeHelpMsgParameters() {
 163                 $params = $this->getAllowedParams();
 164                 if ($params !== false) {
 165
 166                         $paramsDescription = $this->getParamDescription();
 167                         $msg = '';
 168                         $paramPrefix = "\n" . str_repeat(' ', 19);
 169                         foreach ($params as $paramName => $paramSettings) {
 170                                 $desc = isset ($paramsDescription[$paramName]) ? $paramsDescription[$paramName] : '';
 171                                 if (is_array($desc))
 172                                         $desc = implode($paramPrefix, $desc);
 173
 174                                 @ $type = $paramSettings[self :: PARAM_TYPE];
 175                                 if (isset ($type)) {
 176                                         if (isset ($paramSettings[self :: PARAM_ISMULTI]))
 177                                                 $prompt = 'Values (separate with \'|\'): ';
 178                                         else
 179                                                 $prompt = 'One value: ';
 180
 181                                         if (is_array($type)) {
 182                                                 $desc .= $paramPrefix . $prompt . implode(', ', $type);
 183                                         }
 184                                         elseif ($type == 'namespace') {
 185                                                 // Special handling because namespaces are type-limited, yet they are not given
 186                                                 $desc .= $paramPrefix . $prompt . implode(', ', ApiBase :: getValidNamespaces());
 187                                         }
 188                                 }
 189
 190                                 $default = is_array($paramSettings) ? (isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null) : $paramSettings;
 191                                 if (!is_null($default) && $default !== false)
 192                                         $desc .= $paramPrefix . "Default: $default";
 193
 194                                 $msg .= sprintf("  %-14s - %s\n", $this->encodeParamName($paramName), $desc);
 195                         }
 196                         return $msg;
 197
 198                 } else
 199                         return false;
 200         }
 201
 202         /**
 203          * Returns the description string for this module
 204          */
 205         protected function getDescription() {
 206                 return false;
 207         }
 208
 209         /**
 210          * Returns usage examples for this module. Return null if no examples are available.
 211          */
 212         protected function getExamples() {
 213                 return false;
 214         }
 215
 216         /**
 217          * Returns an array of allowed parameters (keys) => default value for that parameter
 218          */
 219         protected function getAllowedParams() {
 220                 return false;
 221         }
 222
 223         /**
 224          * Returns the description string for the given parameter.
 225          */
 226         protected function getParamDescription() {
 227                 return false;
 228         }
 229
 230         /**
 231          * This method mangles parameter name based on the prefix supplied to the constructor.
 232          * Override this method to change parameter name during runtime
 233          */
 234         public function encodeParamName($paramName) {
 235                 return $this->mParamPrefix . $paramName;
 236         }
 237
 238         /**
 239         * Using getAllowedParams(), makes an array of the values provided by the user,
 240         * with key being the name of the variable, and value - validated value from user or default.
 241         * This method can be used to generate local variables using extract().
 242         */
 243         public function extractRequestParams() {
 244                 $params = $this->getAllowedParams();
 245                 $results = array ();
 246
 247                 foreach ($params as $paramName => $paramSettings)
 248                         $results[$paramName] = $this->getParameterFromSettings($paramName, $paramSettings);
 249
 250                 return $results;
 251         }
 252
 253         /**
 254          * Get a value for the given parameter
 255          */
 256         protected function getParameter($paramName) {
 257                 $params = $this->getAllowedParams();
 258                 $paramSettings = $params[$paramName];
 259                 return $this->getParameterFromSettings($paramName, $paramSettings);
 260         }
 261
 262         public static function getValidNamespaces() {
 263                 static $mValidNamespaces = null;
 264                 if (is_null($mValidNamespaces)) {
 265
 266                         global $wgContLang;
 267                         $mValidNamespaces = array ();
 268                         foreach (array_keys($wgContLang->getNamespaces()) as $ns) {
 269                                 if ($ns >= 0)
 270                                         $mValidNamespaces[] = $ns;
 271                         }
 272                 }
 273                 return $mValidNamespaces;
 274         }
 275
 276         /**
 277          * Using the settings determine the value for the given parameter
 278          * @param $paramName String: parameter name
 279          * @param $paramSettings Mixed: default value or an array of settings using PARAM_* constants.
 280          */
 281         protected function getParameterFromSettings($paramName, $paramSettings) {
 282
 283                 // Some classes may decide to change parameter names
 284                 $paramName = $this->encodeParamName($paramName);
 285
 286                 if (!is_array($paramSettings)) {
 287                         $default = $paramSettings;
 288                         $multi = false;
 289                         $type = gettype($paramSettings);
 290                 } else {
 291                         $default = isset ($paramSettings[self :: PARAM_DFLT]) ? $paramSettings[self :: PARAM_DFLT] : null;
 292                         $multi = isset ($paramSettings[self :: PARAM_ISMULTI]) ? $paramSettings[self :: PARAM_ISMULTI] : false;
 293                         $type = isset ($paramSettings[self :: PARAM_TYPE]) ? $paramSettings[self :: PARAM_TYPE] : null;
 294
 295                         // When type is not given, and no choices, the type is the same as $default
 296                         if (!isset ($type)) {
 297                                 if (isset ($default))
 298                                         $type = gettype($default);
 299                                 else
 300                                         $type = 'NULL'; // allow everything
 301                         }
 302                 }
 303
 304                 if ($type == 'boolean') {
 305                         if (isset ($default) && $default !== false) {
 306                                 // Having a default value of anything other than 'false' is pointless
 307                                 ApiBase :: dieDebug(__METHOD__, "Boolean param $paramName's default is set to '$default'");
 308                         }
 309
 310                         $value = $this->getMain()->getRequest()->getCheck($paramName);
 311                 } else {
 312                         $value = $this->getMain()->getRequest()->getVal($paramName, $default);
 313
 314                         if (isset ($value) && $type == 'namespace')
 315                                 $type = ApiBase :: getValidNamespaces();
 316                 }
 317
 318                 if (isset ($value) && ($multi || is_array($type)))
 319                         $value = $this->parseMultiValue($paramName, $value, $multi, is_array($type) ? $type : null);
 320
 321                 // More validation only when choices were not given
 322                 // choices were validated in parseMultiValue()
 323                 if (isset ($value)) {
 324                         if (!is_array($type)) {
 325                                 switch ($type) {
 326                                         case 'NULL' : // nothing to do
 327                                                 break;
 328                                         case 'string' : // nothing to do
 329                                                 break;
 330                                         case 'integer' : // Force everything using intval()
 331                                                 $value = is_array($value) ? array_map('intval', $value) : intval($value);
 332                                                 break;
 333                                         case 'limit' :
 334                                                 if (!isset ($paramSettings[self :: PARAM_MAX1]) || !isset ($paramSettings[self :: PARAM_MAX2]))
 335                                                         ApiBase :: dieDebug(__METHOD__, "MAX1 or MAX2 are not defined for the limit $paramName");
 336                                                 if ($multi)
 337                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $paramName");
 338                                                 $min = isset ($paramSettings[self :: PARAM_MIN]) ? $paramSettings[self :: PARAM_MIN] : 0;
 339                                                 $value = intval($value);
 340                                                 $this->validateLimit($paramName, $value, $min, $paramSettings[self :: PARAM_MAX1], $paramSettings[self :: PARAM_MAX2]);
 341                                                 break;
 342                                         case 'boolean' :
 343                                                 if ($multi)
 344                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $paramName");
 345                                                 break;
 346                                         case 'timestamp' :
 347                                                 if ($multi)
 348                                                         ApiBase :: dieDebug(__METHOD__, "Multi-values not supported for $paramName");
 349                                                 $value = wfTimestamp(TS_UNIX, $value);
 350                                                 if ($value === 0)
 351                                                         $this->dieUsage("Invalid value '$value' for timestamp parameter $paramName", "badtimestamp_{$paramName}");
 352                                                 $value = wfTimestamp(TS_MW, $value);
 353                                                 break;
 354                                         default :
 355                                                 ApiBase :: dieDebug(__METHOD__, "Param $paramName's type is unknown - $type");
 356                                 }
 357                         }
 358
 359                         // There should never be any duplicate values in a list
 360                         if (is_array($value))
 361                                 $value = array_unique($value);
 362                 }
 363
 364                 return $value;
 365         }
 366
 367         /**
 368         * Return an array of values that were given in a 'a|b|c' notation,
 369         * after it optionally validates them against the list allowed values.
 370         *
 371         * @param valueName - The name of the parameter (for error reporting)
 372         * @param value - The value being parsed
 373         * @param allowMultiple - Can $value contain more than one value separated by '|'?
 374         * @param allowedValues - An array of values to check against. If null, all values are accepted.
 375         * @return (allowMultiple ? an_array_of_values : a_single_value)
 376         */
 377         protected function parseMultiValue($valueName, $value, $allowMultiple, $allowedValues) {
 378                 $valuesList = explode('|', $value);
 379                 if (!$allowMultiple && count($valuesList) != 1) {
 380                         $possibleValues = is_array($allowedValues) ? "of '" . implode("', '", $allowedValues) . "'" : '';
 381                         $this->dieUsage("Only one $possibleValues is allowed for parameter '$valueName'", "multival_$valueName");
 382                 }
 383                 if (is_array($allowedValues)) {
 384                         $unknownValues = array_diff($valuesList, $allowedValues);
 385                         if ($unknownValues) {
 386                                 $this->dieUsage('Unrecognised value' . (count($unknownValues) > 1 ? "s" : "") . " for parameter '$valueName'", "unknown_$valueName");
 387                         }
 388                 }
 389
 390                 return $allowMultiple ? $valuesList : $valuesList[0];
 391         }
 392
 393         /**
 394         * Validate the value against the minimum and user/bot maximum limits. Prints usage info on failure.
 395         */
 396         function validateLimit($varname, $value, $min, $max, $botMax) {
 397                 if ($value < $min) {
 398                         $this->dieUsage("$varname may not be less than $min (set to $value)", $varname);
 399                 }
 400
 401                 if ($this->getMain()->isBot()) {
 402                         if ($value > $botMax) {
 403                                 $this->dieUsage("$varname may not be over $botMax (set to $value) for bots", $varname);
 404                         }
 405                 }
 406                 elseif ($value > $max) {
 407                         $this->dieUsage("$varname may not be over $max (set to $value) for users", $varname);
 408                 }
 409         }
 410
 411         /**
 412          * Call main module's error handler
 413          */
 414         public function dieUsage($description, $errorCode, $httpRespCode = 0) {
 415                 throw new UsageException($description, $this->encodeParamName($errorCode), $httpRespCode);
 416         }
 417
 418         /**
 419          * Internal code errors should be reported with this method
 420          */
 421         protected static function dieDebug($method, $message) {
 422                 wfDebugDieBacktrace("Internal error in $method: $message");
 423         }
 424
 425         /**
 426          * Profiling: total module execution time
 427          */
 428         private $mTimeIn = 0, $mModuleTime = 0;
 429
 430         /**
 431          * Start module profiling
 432          */
 433         public function profileIn() {
 434                 if ($this->mTimeIn !== 0)
 435                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileOut()');
 436                 $this->mTimeIn = microtime(true);
 437                 wfProfileIn($this->getModuleProfileName());
 438         }
 439
 440         /**
 441          * End module profiling
 442          */
 443         public function profileOut() {
 444                 if ($this->mTimeIn === 0)
 445                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileIn() first');
 446                 if ($this->mDBTimeIn !== 0)
 447                         ApiBase :: dieDebug(__METHOD__, 'must be called after database profiling is done with profileDBOut()');
 448
 449                 $this->mModuleTime += microtime(true) - $this->mTimeIn;
 450                 $this->mTimeIn = 0;
 451                 wfProfileOut($this->getModuleProfileName());
 452         }
 453
 454         /**
 455          * When modules crash, sometimes it is needed to do a profileOut() regardless
 456          * of the profiling state the module was in. This method does such cleanup.
 457          */
 458         public function safeProfileOut() {
 459                 if ($this->mTimeIn !== 0) {
 460                         if ($this->mDBTimeIn !== 0)
 461                                 $this->profileDBOut();
 462                         $this->profileOut();
 463                 }
 464         }
 465
 466         /**
 467          * Total time the module was executed
 468          */
 469         public function getProfileTime() {
 470                 if ($this->mTimeIn !== 0)
 471                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileOut() first');
 472                 return $this->mModuleTime;
 473         }
 474
 475         /**
 476          * Profiling: database execution time
 477          */
 478         private $mDBTimeIn = 0, $mDBTime = 0;
 479
 480         /**
 481          * Start module profiling
 482          */
 483         public function profileDBIn() {
 484                 if ($this->mTimeIn === 0)
 485                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 486                 if ($this->mDBTimeIn !== 0)
 487                         ApiBase :: dieDebug(__METHOD__, 'called twice without calling profileDBOut()');
 488                 $this->mDBTimeIn = microtime(true);
 489                 wfProfileIn($this->getModuleProfileName(true));
 490         }
 491
 492         /**
 493          * End database profiling
 494          */
 495         public function profileDBOut() {
 496                 if ($this->mTimeIn === 0)
 497                         ApiBase :: dieDebug(__METHOD__, 'must be called while profiling the entire module with profileIn()');
 498                 if ($this->mDBTimeIn === 0)
 499                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBIn() first');
 500
 501                 $time = microtime(true) - $this->mDBTimeIn;
 502                 $this->mDBTimeIn = 0;
 503
 504                 $this->mDBTime += $time;
 505                 $this->getMain()->mDBTime += $time;
 506                 wfProfileOut($this->getModuleProfileName(true));
 507         }
 508
 509         /**
 510          * Total time the module used the database
 511          */
 512         public function getProfileDBTime() {
 513                 if ($this->mDBTimeIn !== 0)
 514                         ApiBase :: dieDebug(__METHOD__, 'called without calling profileDBOut() first');
 515                 return $this->mDBTime;
 516         }
 517
 518         public abstract function getVersion();
 519
 520         public static function getBaseVersion() {
 521                 return __CLASS__ . ': $Id$';
 522         }
 523 }
 524 ?>