MediaWiki master
SpecialDoubleRedirects.php
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1<?php
24namespace MediaWiki\Specials;
25
30use Skin;
31use stdClass;
35
43
44 private IContentHandlerFactory $contentHandlerFactory;
45 private LinkBatchFactory $linkBatchFactory;
46
52 public function __construct(
53 IContentHandlerFactory $contentHandlerFactory,
54 LinkBatchFactory $linkBatchFactory,
55 IConnectionProvider $dbProvider
56 ) {
57 parent::__construct( 'DoubleRedirects' );
58 $this->contentHandlerFactory = $contentHandlerFactory;
59 $this->linkBatchFactory = $linkBatchFactory;
60 $this->setDatabaseProvider( $dbProvider );
61 }
62
63 public function isExpensive() {
64 return true;
65 }
66
67 public function isSyndicated() {
68 return false;
69 }
70
71 protected function sortDescending() {
72 return false;
73 }
74
75 protected function getPageHeader() {
76 return $this->msg( 'doubleredirectstext' )->parseAsBlock();
77 }
78
79 private function reallyGetQueryInfo( $namespace = null, $title = null ) {
80 $limitToTitle = !( $namespace === null && $title === null );
81 $retval = [
82 'tables' => [
83 'ra' => 'redirect',
84 'rb' => 'redirect',
85 'pa' => 'page',
86 'pb' => 'page'
87 ],
88 'fields' => [
89 'namespace' => 'pa.page_namespace',
90 'title' => 'pa.page_title',
91
92 'b_namespace' => 'pb.page_namespace',
93 'b_title' => 'pb.page_title',
94 'b_fragment' => 'ra.rd_fragment',
95
96 // Select fields from redirect instead of page. Because there may
97 // not actually be a page table row for this target (e.g. for interwiki redirects)
98 'c_namespace' => 'rb.rd_namespace',
99 'c_title' => 'rb.rd_title',
100 'c_fragment' => 'rb.rd_fragment',
101 'c_interwiki' => 'rb.rd_interwiki',
102 ],
103 'conds' => [
104 'ra.rd_from = pa.page_id',
105
106 // Filter out redirects where the target goes interwiki (T42353).
107 // This isn't an optimization, it is required for correct results,
108 // otherwise a non-double redirect like Bar -> w:Foo will show up
109 // like "Bar -> Foo -> w:Foo".
110 'ra.rd_interwiki' => '',
111
112 'pb.page_namespace = ra.rd_namespace',
113 'pb.page_title = ra.rd_title',
114
115 'rb.rd_from = pb.page_id',
116 ]
117 ];
118
119 if ( $limitToTitle ) {
120 $retval['conds']['pa.page_namespace'] = $namespace;
121 $retval['conds']['pa.page_title'] = $title;
122 }
123
124 return $retval;
125 }
126
127 public function getQueryInfo() {
128 return $this->reallyGetQueryInfo();
129 }
130
131 protected function getOrderFields() {
132 return [ 'ra.rd_namespace', 'ra.rd_title' ];
133 }
134
140 public function formatResult( $skin, $result ) {
141 // If no Title B or C is in the query, it means this came from
142 // querycache (which only saves the 3 columns for title A).
143 // That does save the bulk of the query cost, but now we need to
144 // get a little more detail about each individual entry quickly
145 // using the filter of reallyGetQueryInfo.
146 $deep = false;
147 if ( $result ) {
148 if ( isset( $result->b_namespace ) ) {
149 $deep = $result;
150 } else {
151 $qi = $this->reallyGetQueryInfo(
152 $result->namespace,
153 $result->title
154 );
155 $deep = $this->getDatabaseProvider()->getReplicaDatabase()->selectRow(
156 $qi['tables'],
157 $qi['fields'],
158 $qi['conds'],
159 __METHOD__
160 );
161 }
162 }
163
164 $titleA = Title::makeTitle( $result->namespace, $result->title );
165
166 $linkRenderer = $this->getLinkRenderer();
167 if ( !$deep ) {
168 return '<del>' . $linkRenderer->makeLink( $titleA, null, [], [ 'redirect' => 'no' ] ) . '</del>';
169 }
170
171 // if the page is editable, add an edit link
172 if (
173 // check user permissions
174 $this->getAuthority()->isAllowed( 'edit' ) &&
175 // check, if the content model is editable through action=edit
176 $this->contentHandlerFactory->getContentHandler( $titleA->getContentModel() )
177 ->supportsDirectEditing()
178 ) {
179 $edit = $linkRenderer->makeKnownLink(
180 $titleA,
181 $this->msg( 'parentheses', $this->msg( 'editlink' )->text() )->text(),
182 [],
183 [ 'action' => 'edit' ]
184 );
185 } else {
186 $edit = '';
187 }
188
189 $linkA = $linkRenderer->makeKnownLink(
190 $titleA,
191 null,
192 [],
193 [ 'redirect' => 'no' ]
194 );
195
196 $titleB = Title::makeTitle( $deep->b_namespace, $deep->b_title );
197 // We show fragment, but don't link to it, as it probably doesn't exist anymore.
198 $titleBFrag = Title::makeTitle( $deep->b_namespace, $deep->b_title, $deep->b_fragment );
199 $linkB = $linkRenderer->makeKnownLink(
200 $titleB,
201 $titleBFrag->getFullText(),
202 [],
203 [ 'redirect' => 'no' ]
204 );
205
206 $titleC = Title::makeTitle(
207 $deep->c_namespace,
208 $deep->c_title,
209 $deep->c_fragment,
210 $deep->c_interwiki
211 );
212 $linkC = $linkRenderer->makeKnownLink( $titleC, $titleC->getFullText() );
213
214 $lang = $this->getLanguage();
215 $arr = $lang->getArrow() . $lang->getDirMark();
216
217 return ( "{$linkA} {$edit} {$arr} {$linkB} {$arr} {$linkC}" );
218 }
219
220 public function execute( $par ) {
221 $this->addHelpLink( 'Help:Redirects' );
222 parent::execute( $par );
223 }
224
231 public function preprocessResults( $db, $res ) {
232 if ( !$res->numRows() ) {
233 return;
234 }
235
236 $batch = $this->linkBatchFactory->newLinkBatch();
237 foreach ( $res as $row ) {
238 $batch->add( $row->namespace, $row->title );
239 if ( isset( $row->b_namespace ) ) {
240 // lazy loaded when using cached results
241 $batch->add( $row->b_namespace, $row->b_title );
242 }
243 if ( isset( $row->c_interwiki ) && !$row->c_interwiki ) {
244 // lazy loaded when using cached result, not added when interwiki link
245 $batch->add( $row->c_namespace, $row->c_title );
246 }
247 }
248 $batch->execute();
249
250 // Back to start for display
251 $res->seek( 0 );
252 }
253
254 protected function getGroupName() {
255 return 'maintenance';
256 }
257}
258
260class_alias( SpecialDoubleRedirects::class, 'SpecialDoubleRedirects' );
This is a class for doing query pages; since they're almost all the same, we factor out some of the f...
Definition QueryPage.php:89
setDatabaseProvider(IConnectionProvider $databaseProvider)
msg( $key,... $params)
Wrapper around wfMessage that sets the current context.
getAuthority()
Shortcut to get the Authority executing this instance.
getLanguage()
Shortcut to get user's language.
addHelpLink( $to, $overrideBaseUrl=false)
Adds help link with an icon via page indicators.
A special page listing redirects to redirecting page.
getQueryInfo()
Subclasses return an SQL query here, formatted as an array with the following keys: tables => Table(s...
getPageHeader()
The content returned by this function will be output before any result.
execute( $par)
This is the actual workhorse.
isSyndicated()
Sometimes we don't want to build rss / atom feeds.
__construct(IContentHandlerFactory $contentHandlerFactory, LinkBatchFactory $linkBatchFactory, IConnectionProvider $dbProvider)
getGroupName()
Under which header this special page is listed in Special:SpecialPages See messages 'specialpages-gro...
getOrderFields()
Subclasses return an array of fields to order by here.
preprocessResults( $db, $res)
Cache page content model and gender distinction for performance.
sortDescending()
Override to sort by increasing values.
isExpensive()
Should this query page only be updated offline on large wikis?
Represents a title within MediaWiki.
Definition Title.php:78
The base class for all skins.
Definition Skin.php:58
Provide primary and replica IDatabase connections.
Basic database interface for live and lazy-loaded relation database handles.
Definition IDatabase.php:36
Result wrapper for grabbing data queried from an IDatabase object.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU Ge...