16e03526018f2e175b0bca74eb272c7215d5f468
4 * Created on Sep 7, 2006
6 * API for MediaWiki 1.8+
8 * Copyright © 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' );
32 * This is the main query class. It behaves similar to ApiMain: based on the
33 * parameters given, it will create a list of titles to work on (an ApiPageSet
34 * object), instantiate and execute various property/list/meta modules, and
35 * assemble all resulting data into a single ApiResult object.
37 * In generator mode, a generator will be executed first to populate a second
38 * ApiPageSet object, and that object will be used for all subsequent modules.
42 class ApiQuery
extends ApiBase
{
44 private $mPropModuleNames, $mListModuleNames, $mMetaModuleNames;
46 private $params, $redirect;
48 private $mQueryPropModules = array(
49 'info' => 'ApiQueryInfo',
50 'revisions' => 'ApiQueryRevisions',
51 'links' => 'ApiQueryLinks',
52 'langlinks' => 'ApiQueryLangLinks',
53 'images' => 'ApiQueryImages',
54 'imageinfo' => 'ApiQueryImageInfo',
55 'templates' => 'ApiQueryLinks',
56 'categories' => 'ApiQueryCategories',
57 'extlinks' => 'ApiQueryExternalLinks',
58 'categoryinfo' => 'ApiQueryCategoryInfo',
59 'duplicatefiles' => 'ApiQueryDuplicateFiles',
62 private $mQueryListModules = array(
63 'allimages' => 'ApiQueryAllimages',
64 'allpages' => 'ApiQueryAllpages',
65 'alllinks' => 'ApiQueryAllLinks',
66 'allcategories' => 'ApiQueryAllCategories',
67 'allusers' => 'ApiQueryAllUsers',
68 'backlinks' => 'ApiQueryBacklinks',
69 'blocks' => 'ApiQueryBlocks',
70 'categorymembers' => 'ApiQueryCategoryMembers',
71 'deletedrevs' => 'ApiQueryDeletedrevs',
72 'embeddedin' => 'ApiQueryBacklinks',
73 'imageusage' => 'ApiQueryBacklinks',
74 'logevents' => 'ApiQueryLogEvents',
75 'recentchanges' => 'ApiQueryRecentChanges',
76 'search' => 'ApiQuerySearch',
77 'tags' => 'ApiQueryTags',
78 'usercontribs' => 'ApiQueryContributions',
79 'watchlist' => 'ApiQueryWatchlist',
80 'watchlistraw' => 'ApiQueryWatchlistRaw',
81 'exturlusage' => 'ApiQueryExtLinksUsage',
82 'users' => 'ApiQueryUsers',
83 'random' => 'ApiQueryRandom',
84 'protectedtitles' => 'ApiQueryProtectedTitles',
87 private $mQueryMetaModules = array(
88 'siteinfo' => 'ApiQuerySiteinfo',
89 'userinfo' => 'ApiQueryUserInfo',
90 'allmessages' => 'ApiQueryAllmessages',
93 private $mSlaveDB = null;
94 private $mNamedDB = array();
96 public function __construct( $main, $action ) {
97 parent
::__construct( $main, $action );
99 // Allow custom modules to be added in LocalSettings.php
100 global $wgAPIPropModules, $wgAPIListModules, $wgAPIMetaModules;
101 self
::appendUserModules( $this->mQueryPropModules
, $wgAPIPropModules );
102 self
::appendUserModules( $this->mQueryListModules
, $wgAPIListModules );
103 self
::appendUserModules( $this->mQueryMetaModules
, $wgAPIMetaModules );
105 $this->mPropModuleNames
= array_keys( $this->mQueryPropModules
);
106 $this->mListModuleNames
= array_keys( $this->mQueryListModules
);
107 $this->mMetaModuleNames
= array_keys( $this->mQueryMetaModules
);
109 // Allow the entire list of modules at first,
110 // but during module instantiation check if it can be used as a generator.
111 $this->mAllowedGenerators
= array_merge( $this->mListModuleNames
, $this->mPropModuleNames
);
115 * Helper function to append any add-in modules to the list
116 * @param $modules array Module array
117 * @param $newModules array Module array to add to $modules
119 private static function appendUserModules( &$modules, $newModules ) {
120 if ( is_array( $newModules ) ) {
121 foreach ( $newModules as $moduleName => $moduleClass ) {
122 $modules[$moduleName] = $moduleClass;
128 * Gets a default slave database connection object
131 public function getDB() {
132 if ( !isset( $this->mSlaveDB
) ) {
133 $this->profileDBIn();
134 $this->mSlaveDB
= wfGetDB( DB_SLAVE
, 'api' );
135 $this->profileDBOut();
137 return $this->mSlaveDB
;
141 * Get the query database connection with the given name.
142 * If no such connection has been requested before, it will be created.
143 * Subsequent calls with the same $name will return the same connection
144 * as the first, regardless of the values of $db and $groups
145 * @param $name string Name to assign to the database connection
146 * @param $db int One of the DB_* constants
147 * @param $groups array Query groups
150 public function getNamedDB( $name, $db, $groups ) {
151 if ( !array_key_exists( $name, $this->mNamedDB
) ) {
152 $this->profileDBIn();
153 $this->mNamedDB
[$name] = wfGetDB( $db, $groups );
154 $this->profileDBOut();
156 return $this->mNamedDB
[$name];
160 * Gets the set of pages the user has requested (or generated)
163 public function getPageSet() {
164 return $this->mPageSet
;
168 * Get the array mapping module names to class names
169 * @return array(modulename => classname)
171 function getModules() {
172 return array_merge( $this->mQueryPropModules
, $this->mQueryListModules
, $this->mQueryMetaModules
);
175 public function getCustomPrinter() {
176 // If &exportnowrap is set, use the raw formatter
177 if ( $this->getParameter( 'export' ) &&
178 $this->getParameter( 'exportnowrap' ) )
180 return new ApiFormatRaw( $this->getMain(),
181 $this->getMain()->createPrinterByName( 'xml' ) );
188 * Query execution happens in the following steps:
189 * #1 Create a PageSet object with any pages requested by the user
190 * #2 If using a generator, execute it to get a new ApiPageSet object
191 * #3 Instantiate all requested modules.
192 * This way the PageSet object will know what shared data is required,
193 * and minimize DB calls.
194 * #4 Output all normalization and redirect resolution information
195 * #5 Execute all requested modules
197 public function execute() {
198 $this->params
= $this->extractRequestParams();
199 $this->redirects
= $this->params
['redirects'];
202 $this->mPageSet
= new ApiPageSet( $this, $this->redirects
);
204 // Instantiate requested modules
206 $this->InstantiateModules( $modules, 'prop', $this->mQueryPropModules
);
207 $this->InstantiateModules( $modules, 'list', $this->mQueryListModules
);
208 $this->InstantiateModules( $modules, 'meta', $this->mQueryMetaModules
);
210 // If given, execute generator to substitute user supplied data with generated data.
211 if ( isset( $this->params
['generator'] ) ) {
212 $this->executeGeneratorModule( $this->params
['generator'], $modules );
214 // Append custom fields and populate page/revision information
215 $this->addCustomFldsToPageSet( $modules, $this->mPageSet
);
216 $this->mPageSet
->execute();
219 // Record page information (title, namespace, if exists, etc)
220 $this->outputGeneralPageInfo();
222 // Execute all requested modules.
223 foreach ( $modules as $module ) {
224 $module->profileIn();
226 wfRunHooks( 'APIQueryAfterExecute', array( &$module ) );
227 $module->profileOut();
232 * Query modules may optimize data requests through the $this->getPageSet() object
233 * by adding extra fields from the page table.
234 * This function will gather all the extra request fields from the modules.
235 * @param $modules array of module objects
236 * @param $pageSet ApiPageSet
238 private function addCustomFldsToPageSet( $modules, $pageSet ) {
239 // Query all requested modules.
240 foreach ( $modules as $module ) {
241 $module->requestExtraData( $pageSet );
246 * Create instances of all modules requested by the client
247 * @param $modules array to append instatiated modules to
248 * @param $param string Parameter name to read modules from
249 * @param $moduleList array(modulename => classname)
251 private function InstantiateModules( &$modules, $param, $moduleList ) {
252 $list = @$this->params
[$param];
253 if ( !is_null ( $list ) ) {
254 foreach ( $list as $moduleName ) {
255 $modules[] = new $moduleList[$moduleName] ( $this, $moduleName );
261 * Appends an element for each page in the current pageSet with the
262 * most general information (id, title), plus any title normalizations
263 * and missing or invalid title/pageids/revids.
265 private function outputGeneralPageInfo() {
266 $pageSet = $this->getPageSet();
267 $result = $this->getResult();
269 // We don't check for a full result set here because we can't be adding
270 // more than 380K. The maximum revision size is in the megabyte range,
271 // and the maximum result size must be even higher than that.
273 // Title normalizations
274 $normValues = array();
275 foreach ( $pageSet->getNormalizedTitles() as $rawTitleStr => $titleStr ) {
276 $normValues[] = array(
277 'from' => $rawTitleStr,
282 if ( count( $normValues ) ) {
283 $result->setIndexedTagName( $normValues, 'n' );
284 $result->addValue( 'query', 'normalized', $normValues );
288 $intrwValues = array();
289 foreach ( $pageSet->getInterwikiTitles() as $rawTitleStr => $interwikiStr ) {
290 $intrwValues[] = array(
291 'title' => $rawTitleStr,
292 'iw' => $interwikiStr
296 if ( count( $intrwValues ) ) {
297 $result->setIndexedTagName( $intrwValues, 'i' );
298 $result->addValue( 'query', 'interwiki', $intrwValues );
301 // Show redirect information
302 $redirValues = array();
303 foreach ( $pageSet->getRedirectTitles() as $titleStrFrom => $titleStrTo ) {
304 $redirValues[] = array(
305 'from' => strval( $titleStrFrom ),
310 if ( count( $redirValues ) ) {
311 $result->setIndexedTagName( $redirValues, 'r' );
312 $result->addValue( 'query', 'redirects', $redirValues );
316 // Missing revision elements
318 $missingRevIDs = $pageSet->getMissingRevisionIDs();
319 if ( count( $missingRevIDs ) ) {
321 foreach ( $missingRevIDs as $revid ) {
322 $revids[$revid] = array(
326 $result->setIndexedTagName( $revids, 'rev' );
327 $result->addValue( 'query', 'badrevids', $revids );
335 // Report any missing titles
336 foreach ( $pageSet->getMissingTitles() as $fakeId => $title ) {
338 ApiQueryBase
::addTitleInfo( $vals, $title );
339 $vals['missing'] = '';
340 $pages[$fakeId] = $vals;
342 // Report any invalid titles
343 foreach ( $pageSet->getInvalidTitles() as $fakeId => $title ) {
344 $pages[$fakeId] = array( 'title' => $title, 'invalid' => '' );
346 // Report any missing page ids
347 foreach ( $pageSet->getMissingPageIDs() as $pageid ) {
348 $pages[$pageid] = array(
354 // Output general page information for found titles
355 foreach ( $pageSet->getGoodTitles() as $pageid => $title ) {
357 $vals['pageid'] = $pageid;
358 ApiQueryBase
::addTitleInfo( $vals, $title );
359 $pages[$pageid] = $vals;
362 if ( count( $pages ) ) {
363 if ( $this->params
['indexpageids'] ) {
364 $pageIDs = array_keys( $pages );
365 // json treats all map keys as strings - converting to match
366 $pageIDs = array_map( 'strval', $pageIDs );
367 $result->setIndexedTagName( $pageIDs, 'id' );
368 $result->addValue( 'query', 'pageids', $pageIDs );
371 $result->setIndexedTagName( $pages, 'page' );
372 $result->addValue( 'query', 'pages', $pages );
374 if ( $this->params
['export'] ) {
375 $exporter = new WikiExporter( $this->getDB() );
376 // WikiExporter writes to stdout, so catch its
379 $exporter->openStream();
380 foreach ( @$pageSet->getGoodTitles() as $title ) {
381 if ( $title->userCanRead() ) {
382 $exporter->pageByTitle( $title );
385 $exporter->closeStream();
386 $exportxml = ob_get_contents();
389 // Don't check the size of exported stuff
390 // It's not continuable, so it would cause more
391 // problems than it'd solve
392 $result->disableSizeCheck();
393 if ( $this->params
['exportnowrap'] ) {
395 // Raw formatter will handle this
396 $result->addValue( null, 'text', $exportxml );
397 $result->addValue( null, 'mime', 'text/xml' );
400 ApiResult
::setContent( $r, $exportxml );
401 $result->addValue( 'query', 'export', $r );
403 $result->enableSizeCheck();
408 * For generator mode, execute generator, and use its output as new
410 * @param $generatorName string Module name
411 * @param $modules array of module objects
413 protected function executeGeneratorModule( $generatorName, $modules ) {
414 // Find class that implements requested generator
415 if ( isset( $this->mQueryListModules
[$generatorName] ) ) {
416 $className = $this->mQueryListModules
[$generatorName];
417 } elseif ( isset( $this->mQueryPropModules
[$generatorName] ) ) {
418 $className = $this->mQueryPropModules
[$generatorName];
420 ApiBase
::dieDebug( __METHOD__
, "Unknown generator=$generatorName" );
424 $resultPageSet = new ApiPageSet( $this, $this->redirects
);
426 // Create and execute the generator
427 $generator = new $className ( $this, $generatorName );
428 if ( !$generator instanceof ApiQueryGeneratorBase
) {
429 $this->dieUsage( "Module $generatorName cannot be used as a generator", 'badgenerator' );
432 $generator->setGeneratorMode();
434 // Add any additional fields modules may need
435 $generator->requestExtraData( $this->mPageSet
);
436 $this->addCustomFldsToPageSet( $modules, $resultPageSet );
438 // Populate page information with the original user input
439 $this->mPageSet
->execute();
441 // populate resultPageSet with the generator output
442 $generator->profileIn();
443 $generator->executeGenerator( $resultPageSet );
444 wfRunHooks( 'APIQueryGeneratorAfterExecute', array( &$generator, &$resultPageSet ) );
445 $resultPageSet->finishPageSetGeneration();
446 $generator->profileOut();
448 // Swap the resulting pageset back in
449 $this->mPageSet
= $resultPageSet;
452 public function getAllowedParams() {
455 ApiBase
::PARAM_ISMULTI
=> true,
456 ApiBase
::PARAM_TYPE
=> $this->mPropModuleNames
459 ApiBase
::PARAM_ISMULTI
=> true,
460 ApiBase
::PARAM_TYPE
=> $this->mListModuleNames
463 ApiBase
::PARAM_ISMULTI
=> true,
464 ApiBase
::PARAM_TYPE
=> $this->mMetaModuleNames
466 'generator' => array(
467 ApiBase
::PARAM_TYPE
=> $this->mAllowedGenerators
469 'redirects' => false,
470 'indexpageids' => false,
472 'exportnowrap' => false,
477 * Override the parent to generate help messages for all available query modules.
480 public function makeHelpMsg() {
483 // Make sure the internal object is empty
484 // (just in case a sub-module decides to optimize during instantiation)
485 $this->mPageSet
= null;
486 $this->mAllowedGenerators
= array(); // Will be repopulated
488 $astriks = str_repeat( '--- ', 8 );
489 $astriks2 = str_repeat( '*** ', 10 );
490 $msg .= "\n$astriks Query: Prop $astriks\n\n";
491 $msg .= $this->makeHelpMsgHelper( $this->mQueryPropModules
, 'prop' );
492 $msg .= "\n$astriks Query: List $astriks\n\n";
493 $msg .= $this->makeHelpMsgHelper( $this->mQueryListModules
, 'list' );
494 $msg .= "\n$astriks Query: Meta $astriks\n\n";
495 $msg .= $this->makeHelpMsgHelper( $this->mQueryMetaModules
, 'meta' );
496 $msg .= "\n\n$astriks2 Modules: continuation $astriks2\n\n";
498 // Perform the base call last because the $this->mAllowedGenerators
499 // will be updated inside makeHelpMsgHelper()
500 // Use parent to make default message for the query module
501 $msg = parent
::makeHelpMsg() . $msg;
507 * For all modules in $moduleList, generate help messages and join them together
508 * @param $moduleList array(modulename => classname)
509 * @param $paramName string Parameter name
512 private function makeHelpMsgHelper( $moduleList, $paramName ) {
513 $moduleDescriptions = array();
515 foreach ( $moduleList as $moduleName => $moduleClass ) {
516 $module = new $moduleClass ( $this, $moduleName, null );
518 $msg = ApiMain
::makeHelpMsgHeader( $module, $paramName );
519 $msg2 = $module->makeHelpMsg();
520 if ( $msg2 !== false ) {
523 if ( $module instanceof ApiQueryGeneratorBase
) {
524 $this->mAllowedGenerators
[] = $moduleName;
525 $msg .= "Generator:\n This module may be used as a generator\n";
527 $moduleDescriptions[] = $msg;
530 return implode( "\n", $moduleDescriptions );
534 * Override to add extra parameters from PageSet
537 public function makeHelpMsgParameters() {
538 $psModule = new ApiPageSet( $this );
539 return $psModule->makeHelpMsgParameters() . parent
::makeHelpMsgParameters();
542 public function shouldCheckMaxlag() {
546 public function getParamDescription() {
548 'prop' => 'Which properties to get for the titles/revisions/pageids',
549 'list' => 'Which lists to get',
550 'meta' => 'Which meta data to get about the site',
551 'generator' => array( 'Use the output of a list as the input for other prop/list/meta items',
552 'NOTE: generator parameter names must be prefixed with a \'g\', see examples.' ),
553 'redirects' => 'Automatically resolve redirects',
554 'indexpageids' => 'Include an additional pageids section listing all returned page IDs.',
555 'export' => 'Export the current revisions of all given or generated pages',
556 'exportnowrap' => 'Return the export XML without wrapping it in an XML result (same format as Special:Export). Can only be used with export',
560 public function getDescription() {
562 'Query API module allows applications to get needed pieces of data from the MediaWiki databases,',
563 'and is loosely based on the old query.php interface.',
564 'All data modifications will first have to use query to acquire a token to prevent abuse from malicious sites.'
568 public function getPossibleErrors() {
569 return array_merge( parent
::getPossibleErrors(), array(
570 array( 'code' => 'badgenerator', 'info' => 'Module $generatorName cannot be used as a generator' ),
574 protected function getExamples() {
576 'api.php?action=query&prop=revisions&meta=siteinfo&titles=Main%20Page&rvprop=user|comment',
577 'api.php?action=query&generator=allpages&gapprefix=API/&prop=revisions',
581 public function getVersion() {
582 $psModule = new ApiPageSet( $this );
584 $vers[] = __CLASS__
. ': $Id$';
585 $vers[] = $psModule->getVersion();