summaryrefslogtreecommitdiff
path: root/includes/specials/SpecialRecentchangeslinked.php
blob: 3b549843fe83bc8c81f6be68301401288f0560ca (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
<?php

/**
 * This is to display changes made to all articles linked in an article.
 * @ingroup SpecialPage
 */
class SpecialRecentchangeslinked extends SpecialRecentchanges {
	var $rclTargetTitle;

	function __construct(){
		SpecialPage::SpecialPage( 'Recentchangeslinked' );
		$this->includable( true );
	}

	public function getDefaultOptions() {
		$opts = parent::getDefaultOptions();
		$opts->add( 'target', '' );
		$opts->add( 'showlinkedto', false );
		$opts->add( 'tagfilter', '' );
		return $opts;
	}

	public function parseParameters( $par, FormOptions $opts ) {
		$opts['target'] = $par;
	}

	public function feedSetup() {
		global $wgRequest;
		$opts = parent::feedSetup();
		$opts['target'] = $wgRequest->getVal( 'target' );
		return $opts;
	}

	public function getFeedObject( $feedFormat ){
		$feed = new ChangesFeed( $feedFormat, false );
		$feedObj = $feed->getFeedObject(
			wfMsgForContent( 'recentchangeslinked-title', $this->getTargetTitle()->getPrefixedText() ),
			wfMsgForContent( 'recentchangeslinked-feed' )
		);
		return array( $feed, $feedObj );
	}

	public function doMainQuery( $conds, $opts ) {
		global $wgUser, $wgOut;

		$target = $opts['target'];
		$showlinkedto = $opts['showlinkedto'];
		$limit = $opts['limit'];

		if ( $target === '' ) {
			return false;
		}
		$title = Title::newFromURL( $target );
		if( !$title || $title->getInterwiki() != '' ){
			$wgOut->wrapWikiMsg( "<div class=\"errorbox\">\n$1</div><br style=\"clear: both\" />", 'allpagesbadtitle' );
			return false;
		}

		$wgOut->setPageTitle( wfMsg( 'recentchangeslinked-title', $title->getPrefixedText() ) );

		/*
		 * Ordinary links are in the pagelinks table, while transclusions are
		 * in the templatelinks table, categorizations in categorylinks and
		 * image use in imagelinks.  We need to somehow combine all these.
		 * Special:Whatlinkshere does this by firing multiple queries and
		 * merging the results, but the code we inherit from our parent class
		 * expects only one result set so we use UNION instead.
		 */

		$dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
		$id = $title->getArticleId();
		$ns = $title->getNamespace();
		$dbkey = $title->getDBkey();

		$tables = array( 'recentchanges' );
		$select = array( $dbr->tableName( 'recentchanges' ) . '.*' );
		$join_conds = array();
		$query_options = array();

		// left join with watchlist table to highlight watched rows
		if( $uid = $wgUser->getId() ) {
			$tables[] = 'watchlist';
			$select[] = 'wl_user';
			$join_conds['watchlist'] = array( 'LEFT JOIN', "wl_user={$uid} AND wl_title=rc_title AND wl_namespace=rc_namespace" );
		}
		if ( $wgUser->isAllowed( 'rollback' ) ) {
			$tables[] = 'page';
			$join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
			$select[] = 'page_latest';
		}

		ChangeTags::modifyDisplayQuery( $tables, $select, $conds, $join_conds,
			$query_options, $opts['tagfilter'] );

		// XXX: parent class does this, should we too?
		// wfRunHooks('SpecialRecentChangesQuery', array( &$conds, &$tables, &$join_conds, $opts ) );

		if( $ns == NS_CATEGORY && !$showlinkedto ) {
			// special handling for categories
			// XXX: should try to make this less klugy
			$link_tables = array( 'categorylinks' );
			$showlinkedto = true;
		} else {
			// for now, always join on these tables; really should be configurable as in whatlinkshere
			$link_tables = array( 'pagelinks', 'templatelinks' );
			// imagelinks only contains links to pages in NS_FILE
			if( $ns == NS_FILE || !$showlinkedto ) $link_tables[] = 'imagelinks';
		}

		if( $id == 0 && !$showlinkedto )
			return false; // nonexistent pages can't link to any pages

		// field name prefixes for all the various tables we might want to join with
		$prefix = array( 'pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il' );

		$subsql = array(); // SELECT statements to combine with UNION

		foreach( $link_tables as $link_table ) {
			$pfx = $prefix[$link_table];

			// imagelinks and categorylinks tables have no xx_namespace field, and have xx_to instead of xx_title
			if( $link_table == 'imagelinks' ) $link_ns = NS_FILE;
			else if( $link_table == 'categorylinks' ) $link_ns = NS_CATEGORY;
			else $link_ns = 0;

			if( $showlinkedto ) {
				// find changes to pages linking to this page
				if( $link_ns ) {
					if( $ns != $link_ns ) continue; // should never happen, but check anyway
					$subconds = array( "{$pfx}_to" => $dbkey );
				} else {
					$subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
				}
				$subjoin = "rc_cur_id = {$pfx}_from";
			} else {
				// find changes to pages linked from this page
				$subconds = array( "{$pfx}_from" => $id );
				if( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
					$subconds["rc_namespace"] = $link_ns;
					$subjoin = "rc_title = {$pfx}_to";
				} else {
					$subjoin = "rc_namespace = {$pfx}_namespace AND rc_title = {$pfx}_title";
				}
			}

			if( $dbr->unionSupportsOrderAndLimit())
				$order = array( 'ORDER BY' => 'rc_timestamp DESC' );
			else
				$order = array();

			
			$query = $dbr->selectSQLText( 
				array_merge( $tables, array( $link_table ) ), 
				$select, 
				$conds + $subconds,
				__METHOD__, 
				$order + $query_options,
				$join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
			);
			
			if( $dbr->unionSupportsOrderAndLimit())
				$query = $dbr->limitResult( $query, $limit );

			$subsql[] = $query;
		}

		if( count($subsql) == 0 )
			return false; // should never happen
		if( count($subsql) == 1 && $dbr->unionSupportsOrderAndLimit() )
			$sql = $subsql[0];
		else {
			// need to resort and relimit after union
			$sql = $dbr->unionQueries($subsql, false).' ORDER BY rc_timestamp DESC';
			$sql = $dbr->limitResult($sql, $limit, false);
		}
		
		$res = $dbr->query( $sql, __METHOD__ );

		if( $res->numRows() == 0 )
			$this->mResultEmpty = true;

		return $res;
	}
	
	function getExtraOptions( $opts ){
		$opts->consumeValues( array( 'showlinkedto', 'target', 'tagfilter' ) );
		$extraOpts = array();
		$extraOpts['namespace'] = $this->namespaceFilterForm( $opts );
		$extraOpts['target'] = array( wfMsgHtml( 'recentchangeslinked-page' ),
			Xml::input( 'target', 40, str_replace('_',' ',$opts['target']) ) .
			Xml::check( 'showlinkedto', $opts['showlinkedto'], array('id' => 'showlinkedto') ) . ' ' .
			Xml::label( wfMsg("recentchangeslinked-to"), 'showlinkedto' ) );
		$tagFilter = ChangeTags::buildTagFilterSelector( $opts['tagfilter'] );
		if ($tagFilter)
			$extraOpts['tagfilter'] = $tagFilter;
		return $extraOpts;
	}

	function getTargetTitle() {
		if ( $this->rclTargetTitle === null ) {
			$opts = $this->getOptions();
			if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
				$this->rclTargetTitle = Title::newFromText( $opts['target'] );
			} else {
				$this->rclTargetTitle = false;
			}
		}
		return $this->rclTargetTitle;
	}

	function setTopText( OutputPage $out, FormOptions $opts ) {
		global $wgUser;
		$skin = $wgUser->getSkin();
		$target = $this->getTargetTitle();
		if( $target )
			$out->setSubtitle( wfMsg( 'recentchangeslinked-backlink', $skin->link( $target,
				$target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
	}

	public function getFeedQuery() {
		$target = $this->getTargetTitle();
		if( $target ) {
			return "target=" . urlencode( $target->getPrefixedDBkey() );
		} else {
			return false;
		}
	}

	function setBottomText( OutputPage $out, FormOptions $opts ) {
		if( isset( $this->mResultEmpty ) && $this->mResultEmpty ){
			$out->addWikiMsg( 'recentchangeslinked-noresult' );	
		}
	}
}