4 * Created on Sep 4, 2006
6 * API for MediaWiki 1.8+
8 * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
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.
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.
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
26 if (!defined('MEDIAWIKI')) {
27 // Eclipse helper - will be ignored in production
28 require_once ('ApiBase.php');
36 * This is the main API class, used for both external and internal processing.
37 * When executed, it will create the requested formatter object,
38 * instantiate and execute an object associated with the needed action,
39 * and use formatter to print results.
40 * In case of an exception, an error message will be printed using the same formatter.
42 * To use API from another application, run it using FauxRequest object, in which
43 * case any internal exceptions will not be handled but passed up to the caller.
44 * After successful execution, use getResult() for the resulting data.
48 class ApiMain extends ApiBase {
51 * When no format parameter is given, this format will be used
53 const API_DEFAULT_FORMAT = 'xmlfm';
56 * List of available modules: action name => module class
58 private static $Modules = array (
59 'login' => 'ApiLogin',
60 'logout' => 'ApiLogout',
61 'query' => 'ApiQuery',
62 'expandtemplates' => 'ApiExpandTemplates',
63 'parse' => 'ApiParse',
64 'opensearch' => 'ApiOpenSearch',
65 'feedwatchlist' => 'ApiFeedWatchlist',
67 'paraminfo' => 'ApiParamInfo',
70 'purge' => 'ApiPurge',
71 'rollback' => 'ApiRollback',
72 'delete' => 'ApiDelete',
73 'undelete' => 'ApiUndelete',
74 'protect' => 'ApiProtect',
75 'block' => 'ApiBlock',
76 'unblock' => 'ApiUnblock',
78 'edit' => 'ApiEditPage',
79 'emailuser' => 'ApiEmailUser',
80 'watch' => 'ApiWatch',
81 'patrol' => 'ApiPatrol',
82 'import' => 'ApiImport',
86 * List of available formats: format name => format class
88 private static $Formats = array (
89 'json' => 'ApiFormatJson',
90 'jsonfm' => 'ApiFormatJson',
91 'php' => 'ApiFormatPhp',
92 'phpfm' => 'ApiFormatPhp',
93 'wddx' => 'ApiFormatWddx',
94 'wddxfm' => 'ApiFormatWddx',
95 'xml' => 'ApiFormatXml',
96 'xmlfm' => 'ApiFormatXml',
97 'yaml' => 'ApiFormatYaml',
98 'yamlfm' => 'ApiFormatYaml',
99 'rawfm' => 'ApiFormatJson',
100 'txt' => 'ApiFormatTxt',
101 'txtfm' => 'ApiFormatTxt',
102 'dbg' => 'ApiFormatDbg',
103 'dbgfm' => 'ApiFormatDbg'
107 * List of user roles that are specifically relevant to the API.
108 * array( 'right' => array ( 'msg' => 'Some message with a $1',
109 * 'params' => array ( $someVarToSubst ) ),
112 private static $mRights = array('writeapi' => array(
113 'msg' => 'Use of the write API',
116 'apihighlimits' => array(
117 '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.',
118 'params' => array (ApiMain::LIMIT_SML2, ApiMain::LIMIT_BIG2)
123 private $mPrinter, $mModules, $mModuleNames, $mFormats, $mFormatNames;
124 private $mResult, $mAction, $mShowVersions, $mEnableWrite, $mRequest, $mInternalMode, $mSquidMaxage;
127 * Constructs an instance of ApiMain that utilizes the module and format specified by $request.
129 * @param $request object - if this is an instance of FauxRequest, errors are thrown and no printing occurs
130 * @param $enableWrite bool should be set to true if the api may modify data
132 public function __construct($request, $enableWrite = false) {
134 $this->mInternalMode = ($request instanceof FauxRequest);
136 // Special handling for the main module: $parent === $this
137 parent :: __construct($this, $this->mInternalMode ? 'main_int' : 'main');
139 if (!$this->mInternalMode) {
141 // Impose module restrictions.
142 // If the current user cannot read,
143 // Remove all modules other than login
146 if( $request->getVal( 'callback' ) !== null ) {
147 // JSON callback allows cross-site reads.
148 // For safety, strip user credentials.
149 wfDebug( "API: stripping user credentials for JSON callback\n" );
150 $wgUser = new User();
154 global $wgAPIModules; // extension modules
155 $this->mModules = $wgAPIModules + self :: $Modules;
157 $this->mModuleNames = array_keys($this->mModules);
158 $this->mFormats = self :: $Formats;
159 $this->mFormatNames = array_keys($this->mFormats);
161 $this->mResult = new ApiResult($this);
162 $this->mShowVersions = false;
163 $this->mEnableWrite = $enableWrite;
165 $this->mRequest = & $request;
167 $this->mSquidMaxage = -1; // flag for executeActionWithErrorHandling()
168 $this->mCommit = false;
172 * Return true if the API was started by other PHP code using FauxRequest
174 public function isInternalMode() {
175 return $this->mInternalMode;
179 * Return the request object that contains client's request
181 public function getRequest() {
182 return $this->mRequest;
186 * Get the ApiResult object asscosiated with current request
188 public function getResult() {
189 return $this->mResult;
193 * Only kept for backwards compatibility
194 * @deprecated Use isWriteMode() instead
196 public function requestWriteMode() {}
199 * Set how long the response should be cached.
201 public function setCacheMaxAge($maxage) {
202 $this->mSquidMaxage = $maxage;
206 * Create an instance of an output formatter by its name
208 public function createPrinterByName($format) {
209 if( !isset( $this->mFormats[$format] ) )
210 $this->dieUsage( "Unrecognized format: {$format}", 'unknown_format' );
211 return new $this->mFormats[$format] ($this, $format);
215 * Execute api request. Any errors will be handled if the API was called by the remote client.
217 public function execute() {
219 if ($this->mInternalMode)
220 $this->executeAction();
222 $this->executeActionWithErrorHandling();
228 * Execute an action, and in case of an error, erase whatever partial results
229 * have been accumulated, and replace it with an error message and a help screen.
231 protected function executeActionWithErrorHandling() {
233 // In case an error occurs during data output,
234 // clear the output buffer and print just the error information
238 $this->executeAction();
239 } catch (Exception $e) {
241 if ( $e instanceof MWException ) {
242 wfDebugLog( 'exception', $e->getLogMessage() );
246 // Handle any kind of exception by outputing properly formatted error message.
247 // If this fails, an unhandled exception should be thrown so that global error
248 // handler will process and log it.
251 $errCode = $this->substituteResultWithError($e);
253 // Error results should not be cached
254 $this->setCacheMaxAge(0);
256 $headerStr = 'MediaWiki-API-Error: ' . $errCode;
257 if ($e->getCode() === 0)
260 header($headerStr, true, $e->getCode());
262 // Reset and print just the error message
265 // If the error occured during printing, do a printer->profileOut()
266 $this->mPrinter->safeProfileOut();
267 $this->printResult(true);
270 if($this->mSquidMaxage == -1)
272 # Nobody called setCacheMaxAge(), use the (s)maxage parameters
273 $smaxage = $this->getParameter('smaxage');
274 $maxage = $this->getParameter('maxage');
277 $smaxage = $maxage = $this->mSquidMaxage;
279 // Set the cache expiration at the last moment, as any errors may change the expiration.
280 // if $this->mSquidMaxage == 0, the expiry time is set to the first second of unix epoch
281 $exp = min($smaxage, $maxage);
282 $expires = ($exp == 0 ? 1 : time() + $exp);
283 header('Expires: ' . wfTimestamp(TS_RFC2822, $expires));
284 header('Cache-Control: s-maxage=' . $smaxage . ', must-revalidate, max-age=' . $maxage);
286 if($this->mPrinter->getIsHtml())
293 * Replace the result data with the information about an exception.
294 * Returns the error code
296 protected function substituteResultWithError($e) {
298 // Printer may not be initialized if the extractRequestParams() fails for the main module
299 if (!isset ($this->mPrinter)) {
300 // The printer has not been created yet. Try to manually get formatter value.
301 $value = $this->getRequest()->getVal('format', self::API_DEFAULT_FORMAT);
302 if (!in_array($value, $this->mFormatNames))
303 $value = self::API_DEFAULT_FORMAT;
305 $this->mPrinter = $this->createPrinterByName($value);
306 if ($this->mPrinter->getNeedsRawData())
307 $this->getResult()->setRawMode();
310 if ($e instanceof UsageException) {
312 // User entered incorrect parameters - print usage screen
314 $errMessage = array (
315 'code' => $e->getCodeString(),
316 'info' => $e->getMessage());
318 // Only print the help message when this is for the developer, not runtime
319 if ($this->mPrinter->getIsHtml() || $this->mAction == 'help')
320 ApiResult :: setContent($errMessage, $this->makeHelpMsg());
323 global $wgShowSQLErrors, $wgShowExceptionDetails;
325 // Something is seriously wrong
327 if ( ( $e instanceof DBQueryError ) && !$wgShowSQLErrors ) {
328 $info = "Database query error";
330 $info = "Exception Caught: {$e->getMessage()}";
333 $errMessage = array (
334 'code' => 'internal_api_error_'. get_class($e),
337 ApiResult :: setContent($errMessage, $wgShowExceptionDetails ? "\n\n{$e->getTraceAsString()}\n\n" : "" );
340 $this->getResult()->reset();
341 $this->getResult()->disableSizeCheck();
343 $requestid = $this->getParameter('requestid');
344 if(!is_null($requestid))
345 $this->getResult()->addValue(null, 'requestid', $requestid);
346 $this->getResult()->addValue(null, 'error', $errMessage);
348 return $errMessage['code'];
352 * Execute the actual module, without any error handling
354 protected function executeAction() {
355 // First add the id to the top element
356 $requestid = $this->getParameter('requestid');
357 if(!is_null($requestid))
358 $this->getResult()->addValue(null, 'requestid', $requestid);
360 $params = $this->extractRequestParams();
362 $this->mShowVersions = $params['version'];
363 $this->mAction = $params['action'];
365 if( !is_string( $this->mAction ) ) {
366 $this->dieUsage( "The API requires a valid action parameter", 'unknown_action' );
369 // Instantiate the module requested by the user
370 $module = new $this->mModules[$this->mAction] ($this, $this->mAction);
372 if( $module->shouldCheckMaxlag() && isset( $params['maxlag'] ) ) {
374 global $wgShowHostnames;
375 $maxLag = $params['maxlag'];
376 list( $host, $lag ) = wfGetLB()->getMaxLag();
377 if ( $lag > $maxLag ) {
378 header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
379 header( 'X-Database-Lag: ' . intval( $lag ) );
380 // XXX: should we return a 503 HTTP error code like wfMaxlagError() does?
381 if( $wgShowHostnames ) {
382 $this->dieUsage( "Waiting for $host: $lag seconds lagged", 'maxlag' );
384 $this->dieUsage( "Waiting for a database server: $lag seconds lagged", 'maxlag' );
391 if ($module->isReadMode() && !$wgUser->isAllowed('read'))
392 $this->dieUsageMsg(array('readrequired'));
393 if ($module->isWriteMode()) {
394 if (!$this->mEnableWrite)
395 $this->dieUsageMsg(array('writedisabled'));
396 if (!$wgUser->isAllowed('writeapi'))
397 $this->dieUsageMsg(array('writerequired'));
399 $this->dieUsageMsg(array('readonlytext'));
402 if (!$this->mInternalMode) {
403 // Ignore mustBePosted() for internal calls
404 if($module->mustBePosted() && !$this->mRequest->wasPosted())
405 $this->dieUsage("The {$this->mAction} module requires a POST request", 'mustbeposted');
407 // See if custom printer is used
408 $this->mPrinter = $module->getCustomPrinter();
409 if (is_null($this->mPrinter)) {
410 // Create an appropriate printer
411 $this->mPrinter = $this->createPrinterByName($params['format']);
414 if ($this->mPrinter->getNeedsRawData())
415 $this->getResult()->setRawMode();
419 $module->profileIn();
421 wfRunHooks('APIAfterExecute', array(&$module));
422 $module->profileOut();
424 if (!$this->mInternalMode) {
426 $this->printResult(false);
431 * Print results using the current printer
433 protected function printResult($isError) {
434 $this->getResult()->cleanUpUTF8();
435 $printer = $this->mPrinter;
436 $printer->profileIn();
438 /* If the help message is requested in the default (xmlfm) format,
439 * tell the printer not to escape ampersands so that our links do
441 $printer->setUnescapeAmps ( ( $this->mAction == 'help' || $isError )
442 && $printer->getFormat() == 'XML' && $printer->getIsHtml() );
444 $printer->initPrinter($isError);
447 $printer->closePrinter();
448 $printer->profileOut();
451 public function isReadMode() {
456 * See ApiBase for description.
458 public function getAllowedParams() {
461 ApiBase :: PARAM_DFLT => ApiMain :: API_DEFAULT_FORMAT,
462 ApiBase :: PARAM_TYPE => $this->mFormatNames
465 ApiBase :: PARAM_DFLT => 'help',
466 ApiBase :: PARAM_TYPE => $this->mModuleNames
470 ApiBase :: PARAM_TYPE => 'integer'
473 ApiBase :: PARAM_TYPE => 'integer',
474 ApiBase :: PARAM_DFLT => 0
477 ApiBase :: PARAM_TYPE => 'integer',
478 ApiBase :: PARAM_DFLT => 0
485 * See ApiBase for description.
487 public function getParamDescription() {
489 'format' => 'The format of the output',
490 'action' => 'What action you would like to perform',
491 'version' => 'When showing help, include version for each module',
492 'maxlag' => 'Maximum lag',
493 'smaxage' => 'Set the s-maxage header to this many seconds. Errors are never cached',
494 'maxage' => 'Set the max-age header to this many seconds. Errors are never cached',
495 'requestid' => 'Request ID to distinguish requests. This will just be output back to you',
500 * See ApiBase for description.
502 public function getDescription() {
506 '******************************************************************',
508 '** This is an auto-generated MediaWiki API documentation page **',
510 '** Documentation and Examples: **',
511 '** http://www.mediawiki.org/wiki/API **',
513 '******************************************************************',
515 'Status: All features shown on this page should be working, but the API',
516 ' is still in active development, and may change at any time.',
517 ' Make sure to monitor our mailing list for any updates.',
519 'Documentation: http://www.mediawiki.org/wiki/API',
520 'Mailing list: http://lists.wikimedia.org/mailman/listinfo/mediawiki-api',
521 'Bugs & Requests: http://bugzilla.wikimedia.org/buglist.cgi?component=API&bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&order=bugs.delta_ts',
531 * Returns an array of strings with credits for the API
533 protected function getCredits() {
536 ' Roan Kattouw <Firstname>.<Lastname>@home.nl (lead developer Sep 2007-present)',
537 ' Victor Vasiliev - vasilvv at gee mail dot com',
538 ' Bryan Tong Minh - bryan . tongminh @ gmail . com',
539 ' Yuri Astrakhan <Firstname><Lastname>@gmail.com (creator, lead developer Sep 2006-Sep 2007)',
541 'Please send your comments, suggestions and questions to mediawiki-api@lists.wikimedia.org',
542 'or file a bug report at http://bugzilla.wikimedia.org/'
547 * Override the parent to generate help messages for all available modules.
549 public function makeHelpMsg() {
551 $this->mPrinter->setHelp();
553 // Use parent to make default message for the main module
554 $msg = parent :: makeHelpMsg();
556 $astriks = str_repeat('*** ', 10);
557 $msg .= "\n\n$astriks Modules $astriks\n\n";
558 foreach( $this->mModules as $moduleName => $unused ) {
559 $module = new $this->mModules[$moduleName] ($this, $moduleName);
560 $msg .= self::makeHelpMsgHeader($module, 'action');
561 $msg2 = $module->makeHelpMsg();
567 $msg .= "\n$astriks Permissions $astriks\n\n";
568 foreach ( self :: $mRights as $right => $rightMsg ) {
569 $groups = User::getGroupsWithPermission( $right );
570 $msg .= "* " . $right . " *\n " . wfMsgReplaceArgs( $rightMsg[ 'msg' ], $rightMsg[ 'params' ] ) .
571 "\nGranted to:\n " . str_replace( "*", "all", implode( ", ", $groups ) ) . "\n";
575 $msg .= "\n$astriks Formats $astriks\n\n";
576 foreach( $this->mFormats as $formatName => $unused ) {
577 $module = $this->createPrinterByName($formatName);
578 $msg .= self::makeHelpMsgHeader($module, 'format');
579 $msg2 = $module->makeHelpMsg();
585 $msg .= "\n*** Credits: ***\n " . implode("\n ", $this->getCredits()) . "\n";
591 public static function makeHelpMsgHeader($module, $paramName) {
592 $modulePrefix = $module->getModulePrefix();
593 if (strval($modulePrefix) !== '')
594 $modulePrefix = "($modulePrefix) ";
596 return "* $paramName={$module->getModuleName()} $modulePrefix*";
599 private $mIsBot = null;
600 private $mIsSysop = null;
601 private $mCanApiHighLimits = null;
604 * Returns true if the currently logged in user is a bot, false otherwise
605 * OBSOLETE, use canApiHighLimits() instead
607 public function isBot() {
608 if (!isset ($this->mIsBot)) {
610 $this->mIsBot = $wgUser->isAllowed('bot');
612 return $this->mIsBot;
616 * Similar to isBot(), this method returns true if the logged in user is
617 * a sysop, and false if not.
618 * OBSOLETE, use canApiHighLimits() instead
620 public function isSysop() {
621 if (!isset ($this->mIsSysop)) {
623 $this->mIsSysop = in_array( 'sysop', $wgUser->getGroups());
626 return $this->mIsSysop;
630 * Check whether the current user is allowed to use high limits
633 public function canApiHighLimits() {
634 if (!isset($this->mCanApiHighLimits)) {
636 $this->mCanApiHighLimits = $wgUser->isAllowed('apihighlimits');
639 return $this->mCanApiHighLimits;
643 * Check whether the user wants us to show version information in the API help
646 public function getShowVersions() {
647 return $this->mShowVersions;
651 * Returns the version information of this file, plus it includes
652 * the versions for all files that are not callable proper API modules
654 public function getVersion() {
656 $vers[] = 'MediaWiki: ' . SpecialVersion::getVersion() . "\n http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/";
657 $vers[] = __CLASS__ . ': $Id: ApiMain.php 50834 2009-05-20 20:10:47Z catrope $';
658 $vers[] = ApiBase :: getBaseVersion();
659 $vers[] = ApiFormatBase :: getBaseVersion();
660 $vers[] = ApiQueryBase :: getBaseVersion();
661 $vers[] = ApiFormatFeedWrapper :: getVersion(); // not accessible with format=xxx
666 * Add or overwrite a module in this ApiMain instance. Intended for use by extending
667 * classes who wish to add their own modules to their lexicon or override the
668 * behavior of inherent ones.
671 * @param $mdlName String The identifier for this module.
672 * @param $mdlClass String The class where this module is implemented.
674 protected function addModule( $mdlName, $mdlClass ) {
675 $this->mModules[$mdlName] = $mdlClass;
679 * Add or overwrite an output format for this ApiMain. Intended for use by extending
680 * classes who wish to add to or modify current formatters.
683 * @param $fmtName The identifier for this format.
684 * @param $fmtClass The class implementing this format.
686 protected function addFormat( $fmtName, $fmtClass ) {
687 $this->mFormats[$fmtName] = $fmtClass;
691 * Get the array mapping module names to class names
693 function getModules() {
694 return $this->mModules;
699 * This exception will be thrown when dieUsage is called to stop module execution.
700 * The exception handling code will print a help screen explaining how this API may be used.
704 class UsageException extends Exception {
708 public function __construct($message, $codestr, $code = 0) {
709 parent :: __construct($message, $code);
710 $this->mCodestr = $codestr;
712 public function getCodeString() {
713 return $this->mCodestr;
715 public function __toString() {
716 return "{$this->getCodeString()}: {$this->getMessage()}";