summaryrefslogtreecommitdiff
path: root/includes/specials/SpecialWhatlinkshere.php
blob: 0b3175a61de3852003fe74a5a8fa611022101330 (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
<?php
/**
 * Implements Special:Whatlinkshere
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @todo Use some variant of Pager or something; the pagination here is lousy.
 */

/**
 * Implements Special:Whatlinkshere
 *
 * @ingroup SpecialPage
 */
class SpecialWhatLinksHere extends IncludableSpecialPage {
	/** @var FormOptions */
	protected $opts;

	protected $selfTitle;

	/** @var Title */
	protected $target;

	protected $limits = array( 20, 50, 100, 250, 500 );

	public function __construct() {
		parent::__construct( 'Whatlinkshere' );
	}

	function execute( $par ) {
		$out = $this->getOutput();

		$this->setHeaders();
		$this->outputHeader();

		$opts = new FormOptions();

		$opts->add( 'target', '' );
		$opts->add( 'namespace', '', FormOptions::INTNULL );
		$opts->add( 'limit', $this->getConfig()->get( 'QueryPageDefaultLimit' ) );
		$opts->add( 'from', 0 );
		$opts->add( 'back', 0 );
		$opts->add( 'hideredirs', false );
		$opts->add( 'hidetrans', false );
		$opts->add( 'hidelinks', false );
		$opts->add( 'hideimages', false );
		$opts->add( 'invert', false );

		$opts->fetchValuesFromRequest( $this->getRequest() );
		$opts->validateIntBounds( 'limit', 0, 5000 );

		// Give precedence to subpage syntax
		if ( $par !== null ) {
			$opts->setValue( 'target', $par );
		}

		// Bind to member variable
		$this->opts = $opts;

		$this->target = Title::newFromURL( $opts->getValue( 'target' ) );
		if ( !$this->target ) {
			if ( !$this->including() ) {
				$out->addHTML( $this->whatlinkshereForm() );
			}

			return;
		}

		$this->getSkin()->setRelevantTitle( $this->target );

		$this->selfTitle = $this->getPageTitle( $this->target->getPrefixedDBkey() );

		$out->setPageTitle( $this->msg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
		$out->addBacklinkSubtitle( $this->target );
		$this->showIndirectLinks(
			0,
			$this->target,
			$opts->getValue( 'limit' ),
			$opts->getValue( 'from' ),
			$opts->getValue( 'back' )
		);
	}

	/**
	 * @param int $level Recursion level
	 * @param Title $target Target title
	 * @param int $limit Number of entries to display
	 * @param int $from Display from this article ID (default: 0)
	 * @param int $back Display from this article ID at backwards scrolling (default: 0)
	 */
	function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
		$out = $this->getOutput();
		$dbr = wfGetDB( DB_SLAVE );

		$hidelinks = $this->opts->getValue( 'hidelinks' );
		$hideredirs = $this->opts->getValue( 'hideredirs' );
		$hidetrans = $this->opts->getValue( 'hidetrans' );
		$hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );

		$fetchlinks = ( !$hidelinks || !$hideredirs );

		// Build query conds in concert for all three tables...
		$conds['pagelinks'] = array(
			'pl_namespace' => $target->getNamespace(),
			'pl_title' => $target->getDBkey(),
		);
		$conds['templatelinks'] = array(
			'tl_namespace' => $target->getNamespace(),
			'tl_title' => $target->getDBkey(),
		);
		$conds['imagelinks'] = array(
			'il_to' => $target->getDBkey(),
		);

		$useLinkNamespaceDBFields = $this->getConfig()->get( 'UseLinkNamespaceDBFields' );
		$namespace = $this->opts->getValue( 'namespace' );
		$invert = $this->opts->getValue( 'invert' );
		$nsComparison = ( $invert ? '!= ' : '= ' ) . $dbr->addQuotes( $namespace );
		if ( is_int( $namespace ) ) {
			if ( $useLinkNamespaceDBFields ) {
				$conds['pagelinks'][] = "pl_from_namespace $nsComparison";
				$conds['templatelinks'][] = "tl_from_namespace $nsComparison";
				$conds['imagelinks'][] = "il_from_namespace $nsComparison";
			} else {
				$conds['pagelinks'][] = "page_namespace $nsComparison";
				$conds['templatelinks'][] = "page_namespace $nsComparison";
				$conds['imagelinks'][] = "page_namespace $nsComparison";
			}
		}

		if ( $from ) {
			$conds['templatelinks'][] = "tl_from >= $from";
			$conds['pagelinks'][] = "pl_from >= $from";
			$conds['imagelinks'][] = "il_from >= $from";
		}

		if ( $hideredirs ) {
			$conds['pagelinks']['rd_from'] = null;
		} elseif ( $hidelinks ) {
			$conds['pagelinks'][] = 'rd_from is NOT NULL';
		}

		$queryFunc = function ( $dbr, $table, $fromCol ) use (
			$conds, $target, $limit, $useLinkNamespaceDBFields
		) {
			// Read an extra row as an at-end check
			$queryLimit = $limit + 1;
			$on = array(
				"rd_from = $fromCol",
				'rd_title' => $target->getDBkey(),
				'rd_interwiki = ' . $dbr->addQuotes( '' ) . ' OR rd_interwiki IS NULL'
			);
			if ( $useLinkNamespaceDBFields ) { // migration check
				$on['rd_namespace'] = $target->getNamespace();
			}
			// Inner LIMIT is 2X in case of stale backlinks with wrong namespaces
			$subQuery = $dbr->selectSqlText(
				array( $table, 'page', 'redirect' ),
				array( $fromCol, 'rd_from' ),
				$conds[$table],
				__CLASS__ . '::showIndirectLinks',
				array( 'ORDER BY' => $fromCol, 'LIMIT' => 2 * $queryLimit ),
				array(
					'page' => array( 'INNER JOIN', "$fromCol = page_id" ),
					'redirect' => array( 'LEFT JOIN', $on )
				)
			);
			return $dbr->select(
				array( 'page', 'temp_backlink_range' => "($subQuery)" ),
				array( 'page_id', 'page_namespace', 'page_title', 'rd_from', 'page_is_redirect' ),
				array(),
				__CLASS__ . '::showIndirectLinks',
				array( 'ORDER BY' => 'page_id', 'LIMIT' => $queryLimit ),
				array( 'page' => array( 'INNER JOIN', "$fromCol = page_id" ) )
			);
		};

		if ( $fetchlinks ) {
			$plRes = $queryFunc( $dbr, 'pagelinks', 'pl_from' );
		}

		if ( !$hidetrans ) {
			$tlRes = $queryFunc( $dbr, 'templatelinks', 'tl_from' );
		}

		if ( !$hideimages ) {
			$ilRes = $queryFunc( $dbr, 'imagelinks', 'il_from' );
		}

		if ( ( !$fetchlinks || !$plRes->numRows() )
			&& ( $hidetrans || !$tlRes->numRows() )
			&& ( $hideimages || !$ilRes->numRows() )
		) {
			if ( 0 == $level ) {
				if ( !$this->including() ) {
					$out->addHTML( $this->whatlinkshereForm() );

					// Show filters only if there are links
					if ( $hidelinks || $hidetrans || $hideredirs || $hideimages ) {
						$out->addHTML( $this->getFilterPanel() );
					}
					$errMsg = is_int( $namespace ) ? 'nolinkshere-ns' : 'nolinkshere';
					$out->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
					$out->setStatusCode( 404 );
				}
			}

			return;
		}

		// Read the rows into an array and remove duplicates
		// templatelinks comes second so that the templatelinks row overwrites the
		// pagelinks row, so we get (inclusion) rather than nothing
		if ( $fetchlinks ) {
			foreach ( $plRes as $row ) {
				$row->is_template = 0;
				$row->is_image = 0;
				$rows[$row->page_id] = $row;
			}
		}
		if ( !$hidetrans ) {
			foreach ( $tlRes as $row ) {
				$row->is_template = 1;
				$row->is_image = 0;
				$rows[$row->page_id] = $row;
			}
		}
		if ( !$hideimages ) {
			foreach ( $ilRes as $row ) {
				$row->is_template = 0;
				$row->is_image = 1;
				$rows[$row->page_id] = $row;
			}
		}

		// Sort by key and then change the keys to 0-based indices
		ksort( $rows );
		$rows = array_values( $rows );

		$numRows = count( $rows );

		// Work out the start and end IDs, for prev/next links
		if ( $numRows > $limit ) {
			// More rows available after these ones
			// Get the ID from the last row in the result set
			$nextId = $rows[$limit]->page_id;
			// Remove undisplayed rows
			$rows = array_slice( $rows, 0, $limit );
		} else {
			// No more rows after
			$nextId = false;
		}
		$prevId = $from;

		if ( $level == 0 ) {
			if ( !$this->including() ) {
				$out->addHTML( $this->whatlinkshereForm() );
				$out->addHTML( $this->getFilterPanel() );
				$out->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );

				$prevnext = $this->getPrevNext( $prevId, $nextId );
				$out->addHTML( $prevnext );
			}
		}
		$out->addHTML( $this->listStart( $level ) );
		foreach ( $rows as $row ) {
			$nt = Title::makeTitle( $row->page_namespace, $row->page_title );

			if ( $row->rd_from && $level < 2 ) {
				$out->addHTML( $this->listItem( $row, $nt, $target, true ) );
				$this->showIndirectLinks(
					$level + 1,
					$nt,
					$this->getConfig()->get( 'MaxRedirectLinksRetrieved' )
				);
				$out->addHTML( Xml::closeElement( 'li' ) );
			} else {
				$out->addHTML( $this->listItem( $row, $nt, $target ) );
			}
		}

		$out->addHTML( $this->listEnd() );

		if ( $level == 0 ) {
			if ( !$this->including() ) {
				$out->addHTML( $prevnext );
			}
		}
	}

	protected function listStart( $level ) {
		return Xml::openElement( 'ul', ( $level ? array() : array( 'id' => 'mw-whatlinkshere-list' ) ) );
	}

	protected function listItem( $row, $nt, $target, $notClose = false ) {
		$dirmark = $this->getLanguage()->getDirMark();

		# local message cache
		static $msgcache = null;
		if ( $msgcache === null ) {
			static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
				'whatlinkshere-links', 'isimage' );
			$msgcache = array();
			foreach ( $msgs as $msg ) {
				$msgcache[$msg] = $this->msg( $msg )->escaped();
			}
		}

		if ( $row->rd_from ) {
			$query = array( 'redirect' => 'no' );
		} else {
			$query = array();
		}

		$link = Linker::linkKnown(
			$nt,
			null,
			$row->page_is_redirect ? array( 'class' => 'mw-redirect' ) : array(),
			$query
		);

		// Display properties (redirect or template)
		$propsText = '';
		$props = array();
		if ( $row->rd_from ) {
			$props[] = $msgcache['isredirect'];
		}
		if ( $row->is_template ) {
			$props[] = $msgcache['istemplate'];
		}
		if ( $row->is_image ) {
			$props[] = $msgcache['isimage'];
		}

		Hooks::run( 'WhatLinksHereProps', array( $row, $nt, $target, &$props ) );

		if ( count( $props ) ) {
			$propsText = $this->msg( 'parentheses' )
				->rawParams( implode( $msgcache['semicolon-separator'], $props ) )->escaped();
		}

		# Space for utilities links, with a what-links-here link provided
		$wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
		$wlh = Xml::wrapClass(
			$this->msg( 'parentheses' )->rawParams( $wlhLink )->escaped(),
			'mw-whatlinkshere-tools'
		);

		return $notClose ?
			Xml::openElement( 'li' ) . "$link $propsText $dirmark $wlh\n" :
			Xml::tags( 'li', null, "$link $propsText $dirmark $wlh" ) . "\n";
	}

	protected function listEnd() {
		return Xml::closeElement( 'ul' );
	}

	protected function wlhLink( Title $target, $text ) {
		static $title = null;
		if ( $title === null ) {
			$title = $this->getPageTitle();
		}

		return Linker::linkKnown(
			$title,
			$text,
			array(),
			array( 'target' => $target->getPrefixedText() )
		);
	}

	function makeSelfLink( $text, $query ) {
		return Linker::linkKnown(
			$this->selfTitle,
			$text,
			array(),
			$query
		);
	}

	function getPrevNext( $prevId, $nextId ) {
		$currentLimit = $this->opts->getValue( 'limit' );
		$prev = $this->msg( 'whatlinkshere-prev' )->numParams( $currentLimit )->escaped();
		$next = $this->msg( 'whatlinkshere-next' )->numParams( $currentLimit )->escaped();

		$changed = $this->opts->getChangedValues();
		unset( $changed['target'] ); // Already in the request title

		if ( 0 != $prevId ) {
			$overrides = array( 'from' => $this->opts->getValue( 'back' ) );
			$prev = $this->makeSelfLink( $prev, array_merge( $changed, $overrides ) );
		}
		if ( 0 != $nextId ) {
			$overrides = array( 'from' => $nextId, 'back' => $prevId );
			$next = $this->makeSelfLink( $next, array_merge( $changed, $overrides ) );
		}

		$limitLinks = array();
		$lang = $this->getLanguage();
		foreach ( $this->limits as $limit ) {
			$prettyLimit = htmlspecialchars( $lang->formatNum( $limit ) );
			$overrides = array( 'limit' => $limit );
			$limitLinks[] = $this->makeSelfLink( $prettyLimit, array_merge( $changed, $overrides ) );
		}

		$nums = $lang->pipeList( $limitLinks );

		return $this->msg( 'viewprevnext' )->rawParams( $prev, $next, $nums )->escaped();
	}

	function whatlinkshereForm() {
		// We get nicer value from the title object
		$this->opts->consumeValue( 'target' );
		// Reset these for new requests
		$this->opts->consumeValues( array( 'back', 'from' ) );

		$target = $this->target ? $this->target->getPrefixedText() : '';
		$namespace = $this->opts->consumeValue( 'namespace' );
		$nsinvert = $this->opts->consumeValue( 'invert' );

		# Build up the form
		$f = Xml::openElement( 'form', array( 'action' => wfScript() ) );

		# Values that should not be forgotten
		$f .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
		foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
			$f .= Html::hidden( $name, $value );
		}

		$f .= Xml::fieldset( $this->msg( 'whatlinkshere' )->text() );

		# Target input (.mw-searchInput enables suggestions)
		$f .= Xml::inputLabel( $this->msg( 'whatlinkshere-page' )->text(), 'target',
			'mw-whatlinkshere-target', 40, $target, array( 'class' => 'mw-searchInput' ) );

		$f .= ' ';

		# Namespace selector
		$f .= Html::namespaceSelector(
			array(
				'selected' => $namespace,
				'all' => '',
				'label' => $this->msg( 'namespace' )->text()
			), array(
				'name' => 'namespace',
				'id' => 'namespace',
				'class' => 'namespaceselector',
			)
		);

		$f .= '&#160;' .
			Xml::checkLabel(
				$this->msg( 'invert' )->text(),
				'invert',
				'nsinvert',
				$nsinvert,
				array( 'title' => $this->msg( 'tooltip-whatlinkshere-invert' )->text() )
			);

		$f .= ' ';

		# Submit
		$f .= Xml::submitButton( $this->msg( 'allpagessubmit' )->text() );

		# Close
		$f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";

		return $f;
	}

	/**
	 * Create filter panel
	 *
	 * @return string HTML fieldset and filter panel with the show/hide links
	 */
	function getFilterPanel() {
		$show = $this->msg( 'show' )->escaped();
		$hide = $this->msg( 'hide' )->escaped();

		$changed = $this->opts->getChangedValues();
		unset( $changed['target'] ); // Already in the request title

		$links = array();
		$types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
		if ( $this->target->getNamespace() == NS_FILE ) {
			$types[] = 'hideimages';
		}

		// Combined message keys: 'whatlinkshere-hideredirs', 'whatlinkshere-hidetrans',
		// 'whatlinkshere-hidelinks', 'whatlinkshere-hideimages'
		// To be sure they will be found by grep
		foreach ( $types as $type ) {
			$chosen = $this->opts->getValue( $type );
			$msg = $chosen ? $show : $hide;
			$overrides = array( $type => !$chosen );
			$links[] = $this->msg( "whatlinkshere-{$type}" )->rawParams(
				$this->makeSelfLink( $msg, array_merge( $changed, $overrides ) ) )->escaped();
		}

		return Xml::fieldset(
			$this->msg( 'whatlinkshere-filters' )->text(),
			$this->getLanguage()->pipeList( $links )
		);
	}

	/**
	 * Return an array of subpages beginning with $search that this special page will accept.
	 *
	 * @param string $search Prefix to search for
	 * @param int $limit Maximum number of results to return (usually 10)
	 * @param int $offset Number of results to skip (usually 0)
	 * @return string[] Matching subpages
	 */
	public function prefixSearchSubpages( $search, $limit, $offset ) {
		if ( $search === '' ) {
			return array();
		}
		// Autocomplete subpage the same as a normal search
		$prefixSearcher = new StringPrefixSearch;
		$result = $prefixSearcher->search( $search, $limit, array(), $offset );
		return $result;
	}

	protected function getGroupName() {
		return 'pagetools';
	}
}