summaryrefslogtreecommitdiff
path: root/includes/api/ApiMain.php
blob: 063e357496f66d8ac488a7fe1d83875d693a2075 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
<?php

/*
 * Created on Sep 4, 2006
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if (!defined('MEDIAWIKI')) {
	// Eclipse helper - will be ignored in production
	require_once ('ApiBase.php');
}

/**
 * @defgroup API API
 */

/**
 * This is the main API class, used for both external and internal processing.
 * When executed, it will create the requested formatter object,
 * instantiate and execute an object associated with the needed action,
 * and use formatter to print results.
 * In case of an exception, an error message will be printed using the same formatter.
 *
 * To use API from another application, run it using FauxRequest object, in which
 * case any internal exceptions will not be handled but passed up to the caller.
 * After successful execution, use getResult() for the resulting data.
 *
 * @ingroup API
 */
class ApiMain extends ApiBase {

	/**
	 * When no format parameter is given, this format will be used
	 */
	const API_DEFAULT_FORMAT = 'xmlfm';

	/**
	 * List of available modules: action name => module class
	 */
	private static $Modules = array (
		'login' => 'ApiLogin',
		'logout' => 'ApiLogout',
		'query' => 'ApiQuery',
		'expandtemplates' => 'ApiExpandTemplates',
		'parse' => 'ApiParse',
		'opensearch' => 'ApiOpenSearch',
		'feedwatchlist' => 'ApiFeedWatchlist',
		'help' => 'ApiHelp',
		'paraminfo' => 'ApiParamInfo',

		// Write modules
		'purge' => 'ApiPurge',
		'rollback' => 'ApiRollback',
		'delete' => 'ApiDelete',
		'undelete' => 'ApiUndelete',
		'protect' => 'ApiProtect',
		'block' => 'ApiBlock',
		'unblock' => 'ApiUnblock',
		'move' => 'ApiMove',
		'edit' => 'ApiEditPage',
		'emailuser' => 'ApiEmailUser',
		'watch' => 'ApiWatch',
		'patrol' => 'ApiPatrol',
		'import' => 'ApiImport',
	);

	/**
	 * List of available formats: format name => format class
	 */
	private static $Formats = array (
		'json' => 'ApiFormatJson',
		'jsonfm' => 'ApiFormatJson',
		'php' => 'ApiFormatPhp',
		'phpfm' => 'ApiFormatPhp',
		'wddx' => 'ApiFormatWddx',
		'wddxfm' => 'ApiFormatWddx',
		'xml' => 'ApiFormatXml',
		'xmlfm' => 'ApiFormatXml',
		'yaml' => 'ApiFormatYaml',
		'yamlfm' => 'ApiFormatYaml',
		'rawfm' => 'ApiFormatJson',
		'txt' => 'ApiFormatTxt',
		'txtfm' => 'ApiFormatTxt',
		'dbg' => 'ApiFormatDbg',
		'dbgfm' => 'ApiFormatDbg'
	);
	
	/**
	 * List of user roles that are specifically relevant to the API.
	 * array( 'right' => array ( 'msg'    => 'Some message with a $1',
	 *                           'params' => array ( $someVarToSubst ) ),
	 *                          );
	 */
	private static $mRights = array('writeapi' => array(
						'msg' => 'Use of the write API',
						'params' => array()
					),
					'apihighlimits'	=> array(
						'msg' => 'Use higher limits in API queries (Slow queries: $1 results; Fast queries: $2 results). The limits for slow queries also apply to multivalue parameters.',
						'params' => array (ApiMain::LIMIT_SML2, ApiMain::LIMIT_BIG2)
					)
	);


	private $mPrinter, $mModules, $mModuleNames, $mFormats, $mFormatNames;
	private $mResult, $mAction, $mShowVersions, $mEnableWrite, $mRequest, $mInternalMode;
	private $mCacheMode = 'private';
	private $mCacheControl = array();

	/**
	* Constructs an instance of ApiMain that utilizes the module and format specified by $request.
	*
	* @param $request object - if this is an instance of FauxRequest, errors are thrown and no printing occurs
	* @param $enableWrite bool should be set to true if the api may modify data
	*/
	public function __construct($request, $enableWrite = false) {

		$this->mInternalMode = ($request instanceof FauxRequest);

		// Special handling for the main module: $parent === $this
		parent :: __construct($this, $this->mInternalMode ? 'main_int' : 'main');

		if (!$this->mInternalMode) {

			// Impose module restrictions.
			// If the current user cannot read,
			// Remove all modules other than login
			global $wgUser;

			if( $request->getVal( 'callback' ) !== null ) {
				// JSON callback allows cross-site reads.
				// For safety, strip user credentials.
				wfDebug( "API: stripping user credentials for JSON callback\n" );
				$wgUser = new User();
			}
		}

		global $wgAPIModules; // extension modules
		$this->mModules = $wgAPIModules + self :: $Modules;

		$this->mModuleNames = array_keys($this->mModules);
		$this->mFormats = self :: $Formats;
		$this->mFormatNames = array_keys($this->mFormats);

		$this->mResult = new ApiResult($this);
		$this->mShowVersions = false;
		$this->mEnableWrite = $enableWrite;

		$this->mRequest = & $request;

		$this->mCommit = false;
	}

	/**
	 * Return true if the API was started by other PHP code using FauxRequest
	 */
	public function isInternalMode() {
		return $this->mInternalMode;
	}

	/**
	 * Return the request object that contains client's request
	 */
	public function getRequest() {
		return $this->mRequest;
	}

	/**
	 * Get the ApiResult object asscosiated with current request
	 */
	public function getResult() {
		return $this->mResult;
	}

	/**
	 * Only kept for backwards compatibility
	 * @deprecated Use isWriteMode() instead
	 */
	public function requestWriteMode() {
		if (!$this->mEnableWrite)
			$this->dieUsageMsg(array('writedisabled'));
		if (wfReadOnly())
			$this->dieUsageMsg(array('readonlytext'));		
	}

	/**
	 * Set how long the response should be cached.
	 */
	public function setCacheMaxAge($maxage) {
		$this->setCacheControl( array(
			'max-age' => $maxage,
			's-maxage' => $maxage
		) );
	}

	/**
	 * Set the type of caching headers which will be sent.
	 *
	 * @param $mode One of:
	 *    - 'public':     Cache this object in public caches, if the maxage or smaxage 
	 *         parameter is set, or if setCacheMaxAge() was called. If a maximum age is
	 *         not provided by any of these means, the object will be private.
	 *    - 'private':    Cache this object only in private client-side caches.
	 *    - 'anon-public-user-private': Make this object cacheable for logged-out
	 *         users, but private for logged-in users. IMPORTANT: If this is set, it must be 
	 *         set consistently for a given URL, it cannot be set differently depending on 
	 *         things like the contents of the database, or whether the user is logged in.
	 *
	 *  If the wiki does not allow anonymous users to read it, the mode set here
	 *  will be ignored, and private caching headers will always be sent. In other words, 
	 *  the "public" mode is equivalent to saying that the data sent is as public as a page
	 *  view.
	 *
	 *  For user-dependent data, the private mode should generally be used. The 
	 *  anon-public-user-private mode should only be used where there is a particularly 
	 *  good performance reason for caching the anonymous response, but where the
	 *  response to logged-in users may differ, or may contain private data. 
	 *
	 *  If this function is never called, then the default will be the private mode.
	 */
	public function setCacheMode( $mode ) {
		if ( !in_array( $mode, array( 'private', 'public', 'anon-public-user-private' ) ) ) {
			wfDebug( __METHOD__.": unrecognised cache mode \"$mode\"\n" );
			// Ignore for forwards-compatibility
			return;
		}

		if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
			// Private wiki, only private headers
			if ( $mode !== 'private' ) {
				wfDebug( __METHOD__.": ignoring request for $mode cache mode, private wiki\n" );
				return;
			}
		}

		wfDebug( __METHOD__.": setting cache mode $mode\n" );
		$this->mCacheMode = $mode;
	}
	
	/**
	 * @deprecated Private caching is now the default, so there is usually no 
	 * need to call this function. If there is a need, you can use 
	 * $this->setCacheMode('private')
	 */
	public function setCachePrivate() {
		$this->setCacheMode( 'private' );
	}

	/**
	 * Set directives (key/value pairs) for the Cache-Control header.
	 * Boolean values will be formatted as such, by including or omitting
	 * without an equals sign.
	 *
	 * Cache control values set here will only be used if the cache mode is not 
	 * private, see setCacheMode().
	 */
	public function setCacheControl( $directives ) {
		$this->mCacheControl = $directives + $this->mCacheControl;
	}
	
	/**
	 * Make sure Vary: Cookie and friends are set. Use this when the output of a request
	 * may be cached for anons but may not be cached for logged-in users.
	 *
	 * WARNING: This function must be called CONSISTENTLY for a given URL. This means that a
	 * given URL must either always or never call this function; if it sometimes does and
	 * sometimes doesn't, stuff will break.
	 *
	 * @deprecated Use setCacheMode( 'anon-public-user-private' )
	 */
	public function setVaryCookie() {
		$this->setCacheMode( 'anon-public-user-private' );
	}

	/**
	 * Create an instance of an output formatter by its name
	 */
	public function createPrinterByName($format) {
		if( !isset( $this->mFormats[$format] ) )
			$this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
		return new $this->mFormats[$format] ($this, $format);
	}

	/**
	 * Execute api request. Any errors will be handled if the API was called by the remote client.
	 */
	public function execute() {
		$this->profileIn();
		if ($this->mInternalMode)
			$this->executeAction();
		else
			$this->executeActionWithErrorHandling();
	
		$this->profileOut();
	}

	/**
	 * Execute an action, and in case of an error, erase whatever partial results
	 * have been accumulated, and replace it with an error message and a help screen.
	 */
	protected function executeActionWithErrorHandling() {

		// In case an error occurs during data output,
		// clear the output buffer and print just the error information
		ob_start();

		try {
			$this->executeAction();
		} catch (Exception $e) {
			// Log it
			if ( $e instanceof MWException ) {
				wfDebugLog( 'exception', $e->getLogMessage() );
			}

			//
			// Handle any kind of exception by outputing properly formatted error message.
			// If this fails, an unhandled exception should be thrown so that global error
			// handler will process and log it.
			//

			$errCode = $this->substituteResultWithError($e);

			// Error results should not be cached
			$this->setCacheMode( 'private' );

			$headerStr = 'MediaWiki-API-Error: ' . $errCode;
			if ($e->getCode() === 0)
				header($headerStr);
			else
				header($headerStr, true, $e->getCode());

			// Reset and print just the error message
			ob_clean();

			// If the error occured during printing, do a printer->profileOut()
			$this->mPrinter->safeProfileOut();
			$this->printResult(true);
		}

		// Send cache headers after any code which might generate an error, to 
		// avoid sending public cache headers for errors.
		$this->sendCacheHeaders();

		if($this->mPrinter->getIsHtml())
			echo wfReportTime();

		ob_end_flush();
	}

	protected function sendCacheHeaders() {
		if ( $this->mCacheMode == 'private' ) {
			header( 'Cache-Control: private' );
			return;
		}

		if ( $this->mCacheMode == 'anon-public-user-private' ) {
			global $wgOut;
			header( 'Vary: Accept-Encoding, Cookie' );
			header( $wgOut->getXVO() );
			if ( session_id() != '' || $wgOut->haveCacheVaryCookies() ) {
				// Logged in, mark this request private
				header( 'Cache-Control: private' );
				return;
			}
			// Logged out, send normal public headers below
		} else /* if public */ {
			// Give a debugging message if the user object is unstubbed on a public request
			global $wgUser;
			if ( !( $wgUser instanceof StubUser ) ) {
				wfDebug( __METHOD__." \$wgUser is unstubbed on a public request!\n" );
			}
		}

		// If nobody called setCacheMaxAge(), use the (s)maxage parameters
		if ( !isset( $this->mCacheControl['s-maxage'] ) ) {
			$this->mCacheControl['s-maxage'] = $this->getParameter( 'smaxage' );
		}
		if ( !isset( $this->mCacheControl['max-age'] ) ) {
			$this->mCacheControl['max-age'] = $this->getParameter( 'maxage' );
		}
		
		if ( !$this->mCacheControl['s-maxage'] && !$this->mCacheControl['max-age'] ) {
			// Public cache not requested
			// Sending a Vary header in this case is harmless, and protects us
			// against conditional calls of setCacheMaxAge().
			header( 'Cache-Control: private' );
			return;
		}

		$this->mCacheControl['public'] = true;

		// Send an Expires header
		$maxAge = min( $this->mCacheControl['s-maxage'], $this->mCacheControl['max-age'] );
		$expiryUnixTime = ( $maxAge == 0 ? 1 : time() + $maxAge );
		header( 'Expires: ' . wfTimestamp( TS_RFC2822, $expiryUnixTime ) );

		// Construct the Cache-Control header
		$ccHeader = '';
		$separator = '';
		foreach ( $this->mCacheControl as $name => $value ) {
			if ( is_bool( $value ) ) {
				if ( $value ) {
					$ccHeader .= $separator . $name;
					$separator = ', ';
				}
			} else {
				$ccHeader .= $separator . "$name=$value";
				$separator = ', ';
			}
		}

		header( "Cache-Control: $ccHeader" );
	}

	/**
	 * Replace the result data with the information about an exception.
	 * Returns the error code
	 */
	protected function substituteResultWithError($e) {

			// Printer may not be initialized if the extractRequestParams() fails for the main module
			if (!isset ($this->mPrinter)) {
				// The printer has not been created yet. Try to manually get formatter value.
				$value = $this->getRequest()->getVal('format', self::API_DEFAULT_FORMAT);
				if (!in_array($value, $this->mFormatNames))
					$value = self::API_DEFAULT_FORMAT;

				$this->mPrinter = $this->createPrinterByName($value);
				if ($this->mPrinter->getNeedsRawData())
					$this->getResult()->setRawMode();
			}

			if ($e instanceof UsageException) {
				//
				// User entered incorrect parameters - print usage screen
				//
				$errMessage = array (
				'code' => $e->getCodeString(),
				'info' => $e->getMessage());

				// Only print the help message when this is for the developer, not runtime
				if ($this->mPrinter->getIsHtml() || $this->mAction == 'help')
					ApiResult :: setContent($errMessage, $this->makeHelpMsg());

			} else {
				global $wgShowSQLErrors, $wgShowExceptionDetails;
				//
				// Something is seriously wrong
				//
				if ( ( $e instanceof DBQueryError ) && !$wgShowSQLErrors ) {
					$info = "Database query error";
				} else {
					$info = "Exception Caught: {$e->getMessage()}";
				}

				$errMessage = array (
					'code' => 'internal_api_error_'. get_class($e),
					'info' => $info,
				);
				ApiResult :: setContent($errMessage, $wgShowExceptionDetails ? "\n\n{$e->getTraceAsString()}\n\n" : "" );				
			}

			$this->getResult()->reset();
			$this->getResult()->disableSizeCheck();
			// Re-add the id
			$requestid = $this->getParameter('requestid');
			if(!is_null($requestid))
				$this->getResult()->addValue(null, 'requestid', $requestid);
			$this->getResult()->addValue(null, 'error', $errMessage);

		return $errMessage['code'];
	}

	/**
	 * Execute the actual module, without any error handling
	 */
	protected function executeAction() {
		// First add the id to the top element
		$requestid = $this->getParameter('requestid');
		if(!is_null($requestid))
			$this->getResult()->addValue(null, 'requestid', $requestid);

		$params = $this->extractRequestParams();

		$this->mShowVersions = $params['version'];
		$this->mAction = $params['action'];

		if( !is_string( $this->mAction ) ) {
			$this->dieUsage( "The API requires a valid action parameter", 'unknown_action' );
		}

		// Instantiate the module requested by the user
		$module = new $this->mModules[$this->mAction] ($this, $this->mAction);

		if( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
			// Check for maxlag
			global $wgShowHostnames;
			$maxLag = $params['maxlag'];
			list( $host, $lag ) = wfGetLB()->getMaxLag();
			if ( $lag > $maxLag ) {
				header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
				header( 'X-Database-Lag: ' . intval( $lag ) );
				// XXX: should we return a 503 HTTP error code like wfMaxlagError() does?
				if( $wgShowHostnames ) {
					$this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
				} else {
					$this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
				}
				return;
			}
		}

		global $wgUser;
		if ($module->isReadMode() && !$wgUser->isAllowed('read'))
			$this->dieUsageMsg(array('readrequired'));
		if ($module->isWriteMode()) {
			if (!$this->mEnableWrite)
				$this->dieUsageMsg(array('writedisabled'));
			if (!$wgUser->isAllowed('writeapi'))
				$this->dieUsageMsg(array('writerequired'));
			if (wfReadOnly())
				$this->dieUsageMsg(array('readonlytext'));
		}

		if (!$this->mInternalMode) {
			// Ignore mustBePosted() for internal calls
			if($module->mustBePosted() && !$this->mRequest->wasPosted())
				$this->dieUsage("The {$this->mAction} module requires a POST request", 'mustbeposted');

			// See if custom printer is used
			$this->mPrinter = $module->getCustomPrinter();
			if (is_null($this->mPrinter)) {
				// Create an appropriate printer
				$this->mPrinter = $this->createPrinterByName($params['format']);
			}

			if ($this->mPrinter->getNeedsRawData())
				$this->getResult()->setRawMode();
		}

		// Execute
		$module->profileIn();
		$module->execute();
		wfRunHooks('APIAfterExecute', array(&$module));
		$module->profileOut();

		if (!$this->mInternalMode) {
			// Print result data
			$this->printResult(false);
		}
	}

	/**
	 * Print results using the current printer
	 */
	protected function printResult($isError) {
		$this->getResult()->cleanUpUTF8();
		$printer = $this->mPrinter;
		$printer->profileIn();

		/* If the help message is requested in the default (xmlfm) format,
		 * tell the printer not to escape ampersands so that our links do
		 * not break. */
		$printer->setUnescapeAmps ( ( $this->mAction == 'help' || $isError )
				&& $printer->getFormat() == 'XML' && $printer->getIsHtml() );

		$printer->initPrinter($isError);

		$printer->execute();
		$printer->closePrinter();
		$printer->profileOut();
	}
	
	public function isReadMode() {
		return false;
	}

	/**
	 * See ApiBase for description.
	 */
	public function getAllowedParams() {
		return array (
			'format' => array (
				ApiBase :: PARAM_DFLT => ApiMain :: API_DEFAULT_FORMAT,
				ApiBase :: PARAM_TYPE => $this->mFormatNames
			),
			'action' => array (
				ApiBase :: PARAM_DFLT => 'help',
				ApiBase :: PARAM_TYPE => $this->mModuleNames
			),
			'version' => false,
			'maxlag'  => array (
				ApiBase :: PARAM_TYPE => 'integer'
			),
			'smaxage' => array (
				ApiBase :: PARAM_TYPE => 'integer',
				ApiBase :: PARAM_DFLT => 0
			),
			'maxage' => array (
				ApiBase :: PARAM_TYPE => 'integer',
				ApiBase :: PARAM_DFLT => 0
			),
			'requestid' => null,
		);
	}

	/**
	 * See ApiBase for description.
	 */
	public function getParamDescription() {
		return array (
			'format' => 'The format of the output',
			'action' => 'What action you would like to perform',
			'version' => 'When showing help, include version for each module',
			'maxlag' => 'Maximum lag',
			'smaxage' => 'Set the s-maxage header to this many seconds. Errors are never cached',
			'maxage' => 'Set the max-age header to this many seconds. Errors are never cached',
			'requestid' => 'Request ID to distinguish requests. This will just be output back to you',
		);
	}

	/**
	 * See ApiBase for description.
	 */
	public function getDescription() {
		return array (
			'',
			'',
			'******************************************************************',
			'**                                                              **',
			'**  This is an auto-generated MediaWiki API documentation page  **',
			'**                                                              **',
			'**                  Documentation and Examples:                 **',
			'**               http://www.mediawiki.org/wiki/API              **',
			'**                                                              **',
			'******************************************************************',
			'',
			'Status:          All features shown on this page should be working, but the API',
			'                 is still in active development, and  may change at any time.',
			'                 Make sure to monitor our mailing list for any updates.',
			'',
			'Documentation:   http://www.mediawiki.org/wiki/API',
			'Mailing list:    http://lists.wikimedia.org/mailman/listinfo/mediawiki-api',
			'Bugs & Requests: http://bugzilla.wikimedia.org/buglist.cgi?component=API&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&order=bugs.delta_ts',
			'',
			'',
			'',
			'',
			'',
		);
	}

	/**
	 * Returns an array of strings with credits for the API
	 */
	protected function getCredits() {
		return array(
			'API developers:',
			'    Roan Kattouw <Firstname>.<Lastname>@home.nl (lead developer Sep 2007-present)',
			'    Victor Vasiliev - vasilvv at gee mail dot com',
			'    Bryan Tong Minh - bryan . tongminh @ gmail . com',
			'    Yuri Astrakhan <Firstname><Lastname>@gmail.com (creator, lead developer Sep 2006-Sep 2007)',
			'',
			'Please send your comments, suggestions and questions to mediawiki-api@lists.wikimedia.org',
			'or file a bug report at http://bugzilla.wikimedia.org/'
		);
	}

	/**
	 * Override the parent to generate help messages for all available modules.
	 */
	public function makeHelpMsg() {

		$this->mPrinter->setHelp();

		// Use parent to make default message for the main module
		$msg = parent :: makeHelpMsg();

		$astriks = str_repeat('*** ', 10);
		$msg .= "\n\n$astriks Modules  $astriks\n\n";
		foreach( $this->mModules as $moduleName => $unused ) {
			$module = new $this->mModules[$moduleName] ($this, $moduleName);
			$msg .= self::makeHelpMsgHeader($module, 'action');
			$msg2 = $module->makeHelpMsg();
			if ($msg2 !== false)
				$msg .= $msg2;
			$msg .= "\n";
		}

		$msg .= "\n$astriks Permissions $astriks\n\n";
		foreach ( self :: $mRights as $right => $rightMsg ) {
			$groups = User::getGroupsWithPermission( $right );
			$msg .= "* " . $right . " *\n  " . wfMsgReplaceArgs( $rightMsg[ 'msg' ], $rightMsg[ 'params' ] ) . 
						"\nGranted to:\n  " . str_replace( "*", "all", implode( ", ", $groups ) ) . "\n";

		}

		$msg .= "\n$astriks Formats  $astriks\n\n";
		foreach( $this->mFormats as $formatName => $unused ) {
			$module = $this->createPrinterByName($formatName);
			$msg .= self::makeHelpMsgHeader($module, 'format');
			$msg2 = $module->makeHelpMsg();
			if ($msg2 !== false)
				$msg .= $msg2;
			$msg .= "\n";
		}

		$msg .= "\n*** Credits: ***\n   " . implode("\n   ", $this->getCredits()) . "\n";


		return $msg;
	}

	public static function makeHelpMsgHeader($module, $paramName) {
		$modulePrefix = $module->getModulePrefix();
		if (strval($modulePrefix) !== '')
			$modulePrefix = "($modulePrefix) ";

		return "* $paramName={$module->getModuleName()} $modulePrefix*";
	}

	private $mIsBot = null;
	private $mIsSysop = null;
	private $mCanApiHighLimits = null;

	/**
	 * Returns true if the currently logged in user is a bot, false otherwise
	 * OBSOLETE, use canApiHighLimits() instead
	 */
	public function isBot() {
		if (!isset ($this->mIsBot)) {
			global $wgUser;
			$this->mIsBot = $wgUser->isAllowed('bot');
		}
		return $this->mIsBot;
	}

	/**
	 * Similar to isBot(), this method returns true if the logged in user is
	 * a sysop, and false if not.
	 * OBSOLETE, use canApiHighLimits() instead
	 */
	public function isSysop() {
		if (!isset ($this->mIsSysop)) {
			global $wgUser;
			$this->mIsSysop = in_array( 'sysop', $wgUser->getGroups());
		}

		return $this->mIsSysop;
	}

	/**
	 * Check whether the current user is allowed to use high limits
	 * @return bool
	 */
	public function canApiHighLimits() {
		if (!isset($this->mCanApiHighLimits)) {
			global $wgUser;
			$this->mCanApiHighLimits = $wgUser->isAllowed('apihighlimits');
		}

		return $this->mCanApiHighLimits;
	}

	/**
	 * Check whether the user wants us to show version information in the API help
	 * @return bool
	 */
	public function getShowVersions() {
		return $this->mShowVersions;
	}

	/**
	 * Returns the version information of this file, plus it includes
	 * the versions for all files that are not callable proper API modules
	 */
	public function getVersion() {
		$vers = array ();
		$vers[] = 'MediaWiki: ' . SpecialVersion::getVersion() . "\n    http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/";
		$vers[] = __CLASS__ . ': $Id: ApiMain.php 69990 2010-07-27 08:44:08Z tstarling $';
		$vers[] = ApiBase :: getBaseVersion();
		$vers[] = ApiFormatBase :: getBaseVersion();
		$vers[] = ApiQueryBase :: getBaseVersion();
		$vers[] = ApiFormatFeedWrapper :: getVersion(); // not accessible with format=xxx
		return $vers;
	}

	/**
	 * Add or overwrite a module in this ApiMain instance. Intended for use by extending
	 * classes who wish to add their own modules to their lexicon or override the
	 * behavior of inherent ones.
	 *
	 * @access protected
	 * @param $mdlName String The identifier for this module.
	 * @param $mdlClass String The class where this module is implemented.
	 */
	protected function addModule( $mdlName, $mdlClass ) {
		$this->mModules[$mdlName] = $mdlClass;
	}

	/**
	 * Add or overwrite an output format for this ApiMain. Intended for use by extending
	 * classes who wish to add to or modify current formatters.
	 *
	 * @access protected
	 * @param $fmtName The identifier for this format.
	 * @param $fmtClass The class implementing this format.
	 */
	protected function addFormat( $fmtName, $fmtClass ) {
		$this->mFormats[$fmtName] = $fmtClass;
	}

	/**
	 * Get the array mapping module names to class names
	 */
	function getModules() {
		return $this->mModules;
	}
}

/**
 * This exception will be thrown when dieUsage is called to stop module execution.
 * The exception handling code will print a help screen explaining how this API may be used.
 *
 * @ingroup API
 */
class UsageException extends Exception {

	private $mCodestr;

	public function __construct($message, $codestr, $code = 0) {
		parent :: __construct($message, $code);
		$this->mCodestr = $codestr;
	}
	public function getCodeString() {
		return $this->mCodestr;
	}
	public function __toString() {
		return "{$this->getCodeString()}: {$this->getMessage()}";
	}
}