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 (
47 'backlinks' => 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() );
112 $this->addFields( 'page_is_redirect' );
113 $this->addWhereFld( $this->bl_title
, $this->rootTitle
->getDBkey() );
115 $this->addWhereFld( $this->bl_ns
, $this->rootTitle
->getNamespace() );
116 $this->addWhereFld( 'page_namespace', $this->params
['namespace'] );
117 if ( !is_null( $this->contID
) )
118 $this->addWhere( "{$this->bl_from}>={$this->contID}" );
119 if ( $this->params
['filterredir'] == 'redirects' )
120 $this->addWhereFld( 'page_is_redirect', 1 );
121 if ( $this->params
['filterredir'] == 'nonredirects' )
122 $this->addWhereFld( 'page_is_redirect', 0 );
123 $this->addOption( 'LIMIT', $this->params
['limit'] +
1 );
124 $this->addOption( 'ORDER BY', $this->bl_from
);
125 $this->addOption( 'STRAIGHT_JOIN' );
128 private function prepareSecondQuery( $resultPageSet = null ) {
129 /* SELECT page_id, page_title, page_namespace, page_is_redirect, pl_title, pl_namespace
130 FROM pagelinks, page WHERE pl_from=page_id
131 AND (pl_title='Foo' AND pl_namespace=0) OR (pl_title='Bar' AND pl_namespace=1)
132 ORDER BY pl_namespace, pl_title, pl_from LIMIT 11
134 $db = $this->getDB();
135 $this->addTables( array( 'page', $this->bl_table
) );
136 $this->addWhere( "{$this->bl_from}=page_id" );
137 if ( is_null( $resultPageSet ) )
138 $this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect' ) );
140 $this->addFields( $resultPageSet->getPageTableFields() );
141 $this->addFields( $this->bl_title
);
143 $this->addFields( $this->bl_ns
);
144 // We can't use LinkBatch here because $this->hasNS may be false
145 $titleWhere = array();
146 foreach ( $this->redirTitles
as $t )
147 $titleWhere[] = "{$this->bl_title} = " . $db->addQuotes( $t->getDBkey() ) .
148 ( $this->hasNS ?
" AND {$this->bl_ns} = '{$t->getNamespace()}'" : "" );
149 $this->addWhere( $db->makeList( $titleWhere, LIST_OR
) );
150 $this->addWhereFld( 'page_namespace', $this->params
['namespace'] );
151 if ( !is_null( $this->redirID
) )
153 $first = $this->redirTitles
[0];
154 $title = $db->strencode( $first->getDBkey() );
155 $ns = $first->getNamespace();
156 $from = $this->redirID
;
158 $this->addWhere( "{$this->bl_ns} > $ns OR " .
159 "({$this->bl_ns} = $ns AND " .
160 "({$this->bl_title} > '$title' OR " .
161 "({$this->bl_title} = '$title' AND " .
162 "{$this->bl_from} >= $from)))" );
164 $this->addWhere( "{$this->bl_title} > '$title' OR " .
165 "({$this->bl_title} = '$title' AND " .
166 "{$this->bl_from} >= $from)" );
169 if ( $this->params
['filterredir'] == 'redirects' )
170 $this->addWhereFld( 'page_is_redirect', 1 );
171 if ( $this->params
['filterredir'] == 'nonredirects' )
172 $this->addWhereFld( 'page_is_redirect', 0 );
173 $this->addOption( 'LIMIT', $this->params
['limit'] +
1 );
174 $this->addOption( 'ORDER BY', $this->bl_sort
);
175 $this->addOption( 'USE INDEX', array( 'page' => 'PRIMARY' ) );
178 private function run( $resultPageSet = null ) {
179 $this->params
= $this->extractRequestParams( false );
180 $this->redirect
= isset( $this->params
['redirect'] ) && $this->params
['redirect'];
181 $userMax = ( $this->redirect ? ApiBase
::LIMIT_BIG1
/ 2 : ApiBase
::LIMIT_BIG1
);
182 $botMax = ( $this->redirect ? ApiBase
::LIMIT_BIG2
/ 2 : ApiBase
::LIMIT_BIG2
);
183 if ( $this->params
['limit'] == 'max' ) {
184 $this->params
['limit'] = $this->getMain()->canApiHighLimits() ?
$botMax : $userMax;
185 $this->getResult()->addValue( 'limits', $this->getModuleName(), $this->params
['limit'] );
188 $this->processContinue();
189 $this->prepareFirstQuery( $resultPageSet );
191 $db = $this->getDB();
192 $res = $this->select( __METHOD__
. '::firstQuery' );
195 $this->pageMap
= array(); // Maps ns and title to pageid
196 $this->continueStr
= null;
197 $this->redirTitles
= array();
198 while ( $row = $db->fetchObject( $res ) ) {
199 if ( ++
$count > $this->params
['limit'] ) {
200 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
201 // Continue string preserved in case the redirect query doesn't pass the limit
202 $this->continueStr
= $this->getContinueStr( $row->page_id
);
206 if ( is_null( $resultPageSet ) )
207 $this->extractRowInfo( $row );
210 $this->pageMap
[$row->page_namespace
][$row->page_title
] = $row->page_id
;
211 if ( $row->page_is_redirect
)
212 $this->redirTitles
[] = Title
::makeTitle( $row->page_namespace
, $row->page_title
);
213 $resultPageSet->processDbRow( $row );
216 $db->freeResult( $res );
218 if ( $this->redirect
&& count( $this->redirTitles
) )
220 $this->resetQueryParams();
221 $this->prepareSecondQuery( $resultPageSet );
222 $res = $this->select( __METHOD__
. '::secondQuery' );
224 while ( $row = $db->fetchObject( $res ) )
226 if ( ++
$count > $this->params
['limit'] )
228 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
229 // We need to keep the parent page of this redir in
231 $parentID = $this->pageMap
[$row-> { $this->bl_ns
} ][$row-> { $this->bl_title
} ];
233 $parentID = $this->pageMap
[NS_IMAGE
][$row-> { $this->bl_title
} ];
234 $this->continueStr
= $this->getContinueRedirStr( $parentID, $row->page_id
);
238 if ( is_null( $resultPageSet ) )
239 $this->extractRedirRowInfo( $row );
241 $resultPageSet->processDbRow( $row );
243 $db->freeResult( $res );
245 if ( is_null( $resultPageSet ) ) {
246 // Try to add the result data in one go and pray that it fits
247 $fit = $this->getResult()->addValue( 'query', $this->getModuleName(), array_values( $this->resultArr
) );
250 // It didn't fit. Add elements one by one until the
252 foreach ( $this->resultArr
as $pageID => $arr )
254 // Add the basic entry without redirlinks first
255 $fit = $this->getResult()->addValue(
256 array( 'query', $this->getModuleName() ),
257 null, array_diff_key( $arr, array( 'redirlinks' => '' ) ) );
260 $this->continueStr
= $this->getContinueStr( $pageID );
265 foreach ( (array)@$arr['redirlinks'] as $key => $redir )
267 $fit = $this->getResult()->addValue(
268 array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
272 $this->continueStr
= $this->getContinueRedirStr( $pageID, $redir['pageid'] );
278 $this->getResult()->setIndexedTagName_internal(
279 array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
286 $this->getResult()->setIndexedTagName_internal(
287 array( 'query', $this->getModuleName() ),
290 if ( !is_null( $this->continueStr
) )
291 $this->setContinueEnumParameter( 'continue', $this->continueStr
);
294 private function extractRowInfo( $row ) {
295 $this->pageMap
[$row->page_namespace
][$row->page_title
] = $row->page_id
;
296 $t = Title
::makeTitle( $row->page_namespace
, $row->page_title
);
297 $a = array( 'pageid' => intval( $row->page_id
) );
298 ApiQueryBase
::addTitleInfo( $a, $t );
299 if ( $row->page_is_redirect
)
302 $this->redirTitles
[] = $t;
304 // Put all the results in an array first
305 $this->resultArr
[$a['pageid']] = $a;
308 private function extractRedirRowInfo( $row )
310 $a['pageid'] = intval( $row->page_id
);
311 ApiQueryBase
::addTitleInfo( $a, Title
::makeTitle( $row->page_namespace
, $row->page_title
) );
312 if ( $row->page_is_redirect
)
314 $ns = $this->hasNS ?
$row-> { $this->bl_ns
} : NS_FILE
;
315 $parentID = $this->pageMap
[$ns][$row-> { $this->bl_title
} ];
316 // Put all the results in an array first
317 $this->resultArr
[$parentID]['redirlinks'][] = $a;
318 $this->getResult()->setIndexedTagName( $this->resultArr
[$parentID]['redirlinks'], $this->bl_code
);
321 protected function processContinue() {
322 if ( !is_null( $this->params
['continue'] ) )
323 $this->parseContinueParam();
325 if ( $this->params
['title'] !== "" ) {
326 $title = Title
::newFromText( $this->params
['title'] );
328 $this->dieUsageMsg( array( 'invalidtitle', $this->params
['title'] ) );
330 $this->rootTitle
= $title;
333 $this->dieUsageMsg( array( 'missingparam', 'title' ) );
337 // only image titles are allowed for the root in imageinfo mode
338 if ( !$this->hasNS
&& $this->rootTitle
->getNamespace() !== NS_FILE
)
339 $this->dieUsage( "The title for {$this->getModuleName()} query must be an image", 'bad_image_title' );
342 protected function parseContinueParam() {
343 $continueList = explode( '|', $this->params
['continue'] );
345 // ns | key | id1 [| id2]
346 // ns+key: root title
347 // id1: first-level page ID to continue from
348 // id2: second-level page ID to continue from
350 // null stuff out now so we know what's set and what isn't
351 $this->rootTitle
= $this->contID
= $this->redirID
= null;
352 $rootNs = intval( $continueList[0] );
353 if ( $rootNs === 0 && $continueList[0] !== '0' )
354 // Illegal continue parameter
355 $this->dieUsage( "Invalid continue param. You should pass the original value returned by the previous query", "_badcontinue" );
356 $this->rootTitle
= Title
::makeTitleSafe( $rootNs, $continueList[1] );
357 if ( !$this->rootTitle
)
358 $this->dieUsage( "Invalid continue param. You should pass the original value returned by the previous query", "_badcontinue" );
359 $contID = intval( $continueList[2] );
360 if ( $contID === 0 && $continueList[2] !== '0' )
361 $this->dieUsage( "Invalid continue param. You should pass the original value returned by the previous query", "_badcontinue" );
362 $this->contID
= $contID;
363 $redirID = intval( @$continueList[3] );
364 if ( $redirID === 0 && @$continueList[3] !== '0' )
365 // This one isn't required
367 $this->redirID
= $redirID;
371 protected function getContinueStr( $lastPageID ) {
372 return $this->rootTitle
->getNamespace() .
373 '|' . $this->rootTitle
->getDBkey() .
377 protected function getContinueRedirStr( $lastPageID, $lastRedirID ) {
378 return $this->getContinueStr( $lastPageID ) . '|' . $lastRedirID;
381 public function getAllowedParams() {
385 'namespace' => array (
386 ApiBase
:: PARAM_ISMULTI
=> true,
387 ApiBase
:: PARAM_TYPE
=> 'namespace'
389 'filterredir' => array(
390 ApiBase
:: PARAM_DFLT
=> 'all',
391 ApiBase
:: PARAM_TYPE
=> array(
398 ApiBase
:: PARAM_DFLT
=> 10,
399 ApiBase
:: PARAM_TYPE
=> 'limit',
400 ApiBase
:: PARAM_MIN
=> 1,
401 ApiBase
:: PARAM_MAX
=> ApiBase
:: LIMIT_BIG1
,
402 ApiBase
:: PARAM_MAX2
=> ApiBase
:: LIMIT_BIG2
405 if ( $this->getModuleName() == 'embeddedin' )
407 $retval['redirect'] = false;
411 public function getParamDescription() {
413 'title' => 'Title to search.',
414 'continue' => 'When more results are available, use this to continue.',
415 'namespace' => 'The namespace to enumerate.',
416 'filterredir' => 'How to filter for redirects'
418 if ( $this->getModuleName() != 'embeddedin' )
419 return array_merge( $retval, array(
420 'redirect' => 'If linking page is a redirect, find all pages that link to that redirect as well. Maximum limit is halved.',
421 'limit' => "How many total pages to return. If {$this->bl_code}redirect is enabled, limit applies to each level separately (which means you may get up to 2 * limit results)."
423 return array_merge( $retval, array(
424 'limit' => "How many total pages to return."
428 public function getDescription() {
429 switch ( $this->getModuleName() ) {
431 return 'Find all pages that link to the given page';
433 return 'Find all pages that embed (transclude) the given title';
435 return 'Find all pages that use the given image title.';
437 ApiBase
:: dieDebug( __METHOD__
, 'Unknown module name' );
441 protected function getExamples() {
442 static $examples = array (
443 'backlinks' => array (
444 "api.php?action=query&list=backlinks&bltitle=Main%20Page",
445 "api.php?action=query&generator=backlinks&gbltitle=Main%20Page&prop=info"
447 'embeddedin' => array (
448 "api.php?action=query&list=embeddedin&eititle=Template:Stub",
449 "api.php?action=query&generator=embeddedin&geititle=Template:Stub&prop=info"
451 'imageusage' => array (
452 "api.php?action=query&list=imageusage&iutitle=File:Albert%20Einstein%20Head.jpg",
453 "api.php?action=query&generator=imageusage&giutitle=File:Albert%20Einstein%20Head.jpg&prop=info"
457 return $examples[$this->getModuleName()];
460 public function getVersion() {
461 return __CLASS__
. ': $Id$';