4 * Created on Oct 16, 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( "ApiQueryBase.php" );
32 * This is a three-in-one module to query:
33 * * backlinks - links pointing to the given page,
34 * * embeddedin - what pages transclude the given page within themselves,
35 * * imageusage - what pages use the given image
39 class ApiQueryBacklinks
extends ApiQueryGeneratorBase
{
41 private $params, $rootTitle, $contRedirs, $contLevel, $contTitle, $contID, $redirID, $redirect;
42 private $bl_ns, $bl_from, $bl_table, $bl_code, $bl_title, $bl_sort, $bl_fields, $hasNS;
43 private $pageMap, $resultArr;
45 // output element name, database column field prefix, database table
46 private $backlinksSettings = array(
50 'linktbl' => 'pagelinks'
52 'embeddedin' => array(
55 'linktbl' => 'templatelinks'
57 'imageusage' => array(
60 'linktbl' => 'imagelinks'
64 public function __construct( $query, $moduleName ) {
65 extract( $this->backlinksSettings
[$moduleName] );
66 $this->resultArr
= array();
68 parent
::__construct( $query, $moduleName, $code );
69 $this->bl_ns
= $prefix . '_namespace';
70 $this->bl_from
= $prefix . '_from';
71 $this->bl_table
= $linktbl;
72 $this->bl_code
= $code;
74 $this->hasNS
= $moduleName !== 'imageusage';
76 $this->bl_title
= $prefix . '_title';
77 $this->bl_sort
= "{$this->bl_ns}, {$this->bl_title}, {$this->bl_from}";
78 $this->bl_fields
= array(
83 $this->bl_title
= $prefix . '_to';
84 $this->bl_sort
= "{$this->bl_title}, {$this->bl_from}";
85 $this->bl_fields
= array(
91 public function execute() {
95 public function executeGenerator( $resultPageSet ) {
96 $this->run( $resultPageSet );
99 private function prepareFirstQuery( $resultPageSet = null ) {
100 /* SELECT page_id, page_title, page_namespace, page_is_redirect
101 * FROM pagelinks, page WHERE pl_from=page_id
102 * AND pl_title='Foo' AND pl_namespace=0
103 * LIMIT 11 ORDER BY pl_from
105 $db = $this->getDB();
106 $this->addTables( array( $this->bl_table
, 'page' ) );
107 $this->addWhere( "{$this->bl_from}=page_id" );
108 if ( is_null( $resultPageSet ) ) {
109 $this->addFields( array( 'page_id', 'page_title', 'page_namespace' ) );
111 $this->addFields( $resultPageSet->getPageTableFields() );
114 $this->addFields( 'page_is_redirect' );
115 $this->addWhereFld( $this->bl_title
, $this->rootTitle
->getDBkey() );
117 if ( $this->hasNS
) {
118 $this->addWhereFld( $this->bl_ns
, $this->rootTitle
->getNamespace() );
120 $this->addWhereFld( 'page_namespace', $this->params
['namespace'] );
122 if ( !is_null( $this->contID
) ) {
123 $this->addWhere( "{$this->bl_from}>={$this->contID}" );
126 if ( $this->params
['filterredir'] == 'redirects' ) {
127 $this->addWhereFld( 'page_is_redirect', 1 );
128 } elseif ( $this->params
['filterredir'] == 'nonredirects' && !$this->redirect
) {
129 // bug 22245 - Check for !redirect, as filtering nonredirects, when getting what links to them is contradictory
130 $this->addWhereFld( 'page_is_redirect', 0 );
133 $this->addOption( 'LIMIT', $this->params
['limit'] +
1 );
134 $this->addOption( 'ORDER BY', $this->bl_from
);
135 $this->addOption( 'STRAIGHT_JOIN' );
138 private function prepareSecondQuery( $resultPageSet = null ) {
139 /* SELECT page_id, page_title, page_namespace, page_is_redirect, pl_title, pl_namespace
140 FROM pagelinks, page WHERE pl_from=page_id
141 AND (pl_title='Foo' AND pl_namespace=0) OR (pl_title='Bar' AND pl_namespace=1)
142 ORDER BY pl_namespace, pl_title, pl_from LIMIT 11
144 $db = $this->getDB();
145 $this->addTables( array( 'page', $this->bl_table
) );
146 $this->addWhere( "{$this->bl_from}=page_id" );
148 if ( is_null( $resultPageSet ) ) {
149 $this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect' ) );
151 $this->addFields( $resultPageSet->getPageTableFields() );
154 $this->addFields( $this->bl_title
);
155 if ( $this->hasNS
) {
156 $this->addFields( $this->bl_ns
);
159 // We can't use LinkBatch here because $this->hasNS may be false
160 $titleWhere = array();
161 foreach ( $this->redirTitles
as $t ) {
162 $titleWhere[] = "{$this->bl_title} = " . $db->addQuotes( $t->getDBkey() ) .
163 ( $this->hasNS ?
" AND {$this->bl_ns} = '{$t->getNamespace()}'" : '' );
165 $this->addWhere( $db->makeList( $titleWhere, LIST_OR
) );
166 $this->addWhereFld( 'page_namespace', $this->params
['namespace'] );
168 if ( !is_null( $this->redirID
) ) {
169 $first = $this->redirTitles
[0];
170 $title = $db->strencode( $first->getDBkey() );
171 $ns = $first->getNamespace();
172 $from = $this->redirID
;
173 if ( $this->hasNS
) {
174 $this->addWhere( "{$this->bl_ns} > $ns OR " .
175 "({$this->bl_ns} = $ns AND " .
176 "({$this->bl_title} > '$title' OR " .
177 "({$this->bl_title} = '$title' AND " .
178 "{$this->bl_from} >= $from)))" );
180 $this->addWhere( "{$this->bl_title} > '$title' OR " .
181 "({$this->bl_title} = '$title' AND " .
182 "{$this->bl_from} >= $from)" );
185 if ( $this->params
['filterredir'] == 'redirects' ) {
186 $this->addWhereFld( 'page_is_redirect', 1 );
187 } elseif ( $this->params
['filterredir'] == 'nonredirects' ) {
188 $this->addWhereFld( 'page_is_redirect', 0 );
191 $this->addOption( 'LIMIT', $this->params
['limit'] +
1 );
192 $this->addOption( 'ORDER BY', $this->bl_sort
);
193 $this->addOption( 'USE INDEX', array( 'page' => 'PRIMARY' ) );
196 private function run( $resultPageSet = null ) {
197 $this->params
= $this->extractRequestParams( false );
198 $this->redirect
= isset( $this->params
['redirect'] ) && $this->params
['redirect'];
199 $userMax = ( $this->redirect ? ApiBase
::LIMIT_BIG1
/ 2 : ApiBase
::LIMIT_BIG1
);
200 $botMax = ( $this->redirect ? ApiBase
::LIMIT_BIG2
/ 2 : ApiBase
::LIMIT_BIG2
);
201 if ( $this->params
['limit'] == 'max' ) {
202 $this->params
['limit'] = $this->getMain()->canApiHighLimits() ?
$botMax : $userMax;
203 $this->getResult()->addValue( 'limits', $this->getModuleName(), $this->params
['limit'] );
206 $this->processContinue();
207 $this->prepareFirstQuery( $resultPageSet );
209 $db = $this->getDB();
210 $res = $this->select( __METHOD__
. '::firstQuery' );
213 $this->pageMap
= array(); // Maps ns and title to pageid
214 $this->continueStr
= null;
215 $this->redirTitles
= array();
216 while ( $row = $db->fetchObject( $res ) ) {
217 if ( ++
$count > $this->params
['limit'] ) {
218 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
219 // Continue string preserved in case the redirect query doesn't pass the limit
220 $this->continueStr
= $this->getContinueStr( $row->page_id
);
224 if ( is_null( $resultPageSet ) ) {
225 $this->extractRowInfo( $row );
227 $this->pageMap
[$row->page_namespace
][$row->page_title
] = $row->page_id
;
228 if ( $row->page_is_redirect
) {
229 $this->redirTitles
[] = Title
::makeTitle( $row->page_namespace
, $row->page_title
);
232 $resultPageSet->processDbRow( $row );
235 $db->freeResult( $res );
237 if ( $this->redirect
&& count( $this->redirTitles
) ) {
238 $this->resetQueryParams();
239 $this->prepareSecondQuery( $resultPageSet );
240 $res = $this->select( __METHOD__
. '::secondQuery' );
242 while ( $row = $db->fetchObject( $res ) ) {
243 if ( ++
$count > $this->params
['limit'] ) {
244 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
245 // We need to keep the parent page of this redir in
246 if ( $this->hasNS
) {
247 $parentID = $this->pageMap
[$row-> { $this->bl_ns
} ][$row-> { $this->bl_title
} ];
249 $parentID = $this->pageMap
[NS_IMAGE
][$row->{$this->bl_title
}];
251 $this->continueStr
= $this->getContinueRedirStr( $parentID, $row->page_id
);
255 if ( is_null( $resultPageSet ) ) {
256 $this->extractRedirRowInfo( $row );
258 $resultPageSet->processDbRow( $row );
261 $db->freeResult( $res );
263 if ( is_null( $resultPageSet ) ) {
264 // Try to add the result data in one go and pray that it fits
265 $fit = $this->getResult()->addValue( 'query', $this->getModuleName(), array_values( $this->resultArr
) );
267 // It didn't fit. Add elements one by one until the
269 foreach ( $this->resultArr
as $pageID => $arr ) {
270 // Add the basic entry without redirlinks first
271 $fit = $this->getResult()->addValue(
272 array( 'query', $this->getModuleName() ),
273 null, array_diff_key( $arr, array( 'redirlinks' => '' ) ) );
275 $this->continueStr
= $this->getContinueStr( $pageID );
280 foreach ( (array)@$arr['redirlinks'] as $key => $redir ) {
281 $fit = $this->getResult()->addValue(
282 array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
285 $this->continueStr
= $this->getContinueRedirStr( $pageID, $redir['pageid'] );
291 $this->getResult()->setIndexedTagName_internal(
292 array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
301 $this->getResult()->setIndexedTagName_internal(
302 array( 'query', $this->getModuleName() ),
306 if ( !is_null( $this->continueStr
) ) {
307 $this->setContinueEnumParameter( 'continue', $this->continueStr
);
311 private function extractRowInfo( $row ) {
312 $this->pageMap
[$row->page_namespace
][$row->page_title
] = $row->page_id
;
313 $t = Title
::makeTitle( $row->page_namespace
, $row->page_title
);
314 $a = array( 'pageid' => intval( $row->page_id
) );
315 ApiQueryBase
::addTitleInfo( $a, $t );
316 if ( $row->page_is_redirect
) {
318 $this->redirTitles
[] = $t;
320 // Put all the results in an array first
321 $this->resultArr
[$a['pageid']] = $a;
324 private function extractRedirRowInfo( $row ) {
325 $a['pageid'] = intval( $row->page_id
);
326 ApiQueryBase
::addTitleInfo( $a, Title
::makeTitle( $row->page_namespace
, $row->page_title
) );
327 if ( $row->page_is_redirect
) {
330 $ns = $this->hasNS ?
$row-> { $this->bl_ns
} : NS_FILE
;
331 $parentID = $this->pageMap
[$ns][$row-> { $this->bl_title
} ];
332 // Put all the results in an array first
333 $this->resultArr
[$parentID]['redirlinks'][] = $a;
334 $this->getResult()->setIndexedTagName( $this->resultArr
[$parentID]['redirlinks'], $this->bl_code
);
337 protected function processContinue() {
338 if ( !is_null( $this->params
['continue'] ) ) {
339 $this->parseContinueParam();
341 if ( $this->params
['title'] !== '' ) {
342 $title = Title
::newFromText( $this->params
['title'] );
344 $this->dieUsageMsg( array( 'invalidtitle', $this->params
['title'] ) );
346 $this->rootTitle
= $title;
349 $this->dieUsageMsg( array( 'missingparam', 'title' ) );
353 // only image titles are allowed for the root in imageinfo mode
354 if ( !$this->hasNS
&& $this->rootTitle
->getNamespace() !== NS_FILE
) {
355 $this->dieUsage( "The title for {$this->getModuleName()} query must be an image", 'bad_image_title' );
359 protected function parseContinueParam() {
360 $continueList = explode( '|', $this->params
['continue'] );
362 // ns | key | id1 [| id2]
363 // ns+key: root title
364 // id1: first-level page ID to continue from
365 // id2: second-level page ID to continue from
367 // null stuff out now so we know what's set and what isn't
368 $this->rootTitle
= $this->contID
= $this->redirID
= null;
369 $rootNs = intval( $continueList[0] );
370 if ( $rootNs === 0 && $continueList[0] !== '0' ) {
371 // Illegal continue parameter
372 $this->dieUsage( 'Invalid continue param. You should pass the original value returned by the previous query', '_badcontinue' );
374 $this->rootTitle
= Title
::makeTitleSafe( $rootNs, $continueList[1] );
376 if ( !$this->rootTitle
) {
377 $this->dieUsage( 'Invalid continue param. You should pass the original value returned by the previous query', '_badcontinue' );
379 $contID = intval( $continueList[2] );
381 if ( $contID === 0 && $continueList[2] !== '0' ) {
382 $this->dieUsage( 'Invalid continue param. You should pass the original value returned by the previous query', '_badcontinue' );
384 $this->contID
= $contID;
385 $redirID = intval( @$continueList[3] );
387 if ( $redirID === 0 && @$continueList[3] !== '0' ) {
388 // This one isn't required
391 $this->redirID
= $redirID;
395 protected function getContinueStr( $lastPageID ) {
396 return $this->rootTitle
->getNamespace() .
397 '|' . $this->rootTitle
->getDBkey() .
401 protected function getContinueRedirStr( $lastPageID, $lastRedirID ) {
402 return $this->getContinueStr( $lastPageID ) . '|' . $lastRedirID;
405 public function getAllowedParams() {
409 'namespace' => array(
410 ApiBase
::PARAM_ISMULTI
=> true,
411 ApiBase
::PARAM_TYPE
=> 'namespace'
413 'filterredir' => array(
414 ApiBase
::PARAM_DFLT
=> 'all',
415 ApiBase
::PARAM_TYPE
=> array(
422 ApiBase
::PARAM_DFLT
=> 10,
423 ApiBase
::PARAM_TYPE
=> 'limit',
424 ApiBase
::PARAM_MIN
=> 1,
425 ApiBase
::PARAM_MAX
=> ApiBase
::LIMIT_BIG1
,
426 ApiBase
::PARAM_MAX2
=> ApiBase
::LIMIT_BIG2
429 if ( $this->getModuleName() == 'embeddedin' ) {
432 $retval['redirect'] = false;
436 public function getParamDescription() {
438 'title' => 'Title to search.',
439 'continue' => 'When more results are available, use this to continue.',
440 'namespace' => 'The namespace to enumerate.',
442 if ( $this->getModuleName() != 'embeddedin' ) {
443 return array_merge( $retval, array(
444 'redirect' => 'If linking page is a redirect, find all pages that link to that redirect as well. Maximum limit is halved.',
445 'filterredir' => "How to filter for redirects. If set to nonredirects when {$this->bl_code}redirect is enabled, this is only applied to the second level",
446 'limit' => "How many total pages to return. If {$this->bl_code}redirect is enabled, limit applies to each level separately (which means you may get up to 2 * limit results)."
449 return array_merge( $retval, array(
450 'filterredir' => 'How to filter for redirects',
451 'limit' => 'How many total pages to return.'
455 public function getDescription() {
456 switch ( $this->getModuleName() ) {
458 return 'Find all pages that link to the given page';
460 return 'Find all pages that embed (transclude) the given title';
462 return 'Find all pages that use the given image title.';
464 ApiBase
::dieDebug( __METHOD__
, 'Unknown module name' );
468 public function getPossibleErrors() {
469 return array_merge( parent
::getPossibleErrors(), array(
470 array( 'invalidtitle', 'title' ),
471 array( 'missingparam', 'title' ),
472 array( 'code' => 'bad_image_title', 'info' => "The title for {$this->getModuleName()} query must be an image" ),
473 array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
477 protected function getExamples() {
478 static $examples = array(
479 'backlinks' => array(
480 'api.php?action=query&list=backlinks&bltitle=Main%20Page',
481 'api.php?action=query&generator=backlinks&gbltitle=Main%20Page&prop=info'
483 'embeddedin' => array(
484 'api.php?action=query&list=embeddedin&eititle=Template:Stub',
485 'api.php?action=query&generator=embeddedin&geititle=Template:Stub&prop=info'
487 'imageusage' => array(
488 'api.php?action=query&list=imageusage&iutitle=File:Albert%20Einstein%20Head.jpg',
489 'api.php?action=query&generator=imageusage&giutitle=File:Albert%20Einstein%20Head.jpg&prop=info'
493 return $examples[$this->getModuleName()];
496 public function getVersion() {
497 return __CLASS__
. ': $Id$';