3 * Job to fix double redirects after moving a page.
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25 * Job to fix double redirects after moving a page
29 class DoubleRedirectJob
extends Job
{
30 /** @var string Reason for the change, 'maintenance' or 'move'. Suffix fo
31 * message key 'double-redirect-fixed-'.
35 /** @var Title The title which has changed, redirects pointing to this
44 * Insert jobs into the job queue to fix redirects to the given title
45 * @param string $reason the reason for the fix, see message
46 * "double-redirect-fixed-<reason>"
47 * @param $redirTitle Title: the title which has changed, redirects
48 * pointing to this title are fixed
49 * @param bool $destTitle Not used
51 public static function fixRedirects( $reason, $redirTitle, $destTitle = false ) {
52 # Need to use the master to get the redirect table updated in the same transaction
53 $dbw = wfGetDB( DB_MASTER
);
55 array( 'redirect', 'page' ),
56 array( 'page_namespace', 'page_title' ),
59 'rd_namespace' => $redirTitle->getNamespace(),
60 'rd_title' => $redirTitle->getDBkey()
62 if ( !$res->numRows() ) {
66 foreach ( $res as $row ) {
67 $title = Title
::makeTitle( $row->page_namespace
, $row->page_title
);
72 $jobs[] = new self( $title, array(
74 'redirTitle' => $redirTitle->getPrefixedDBkey() ) );
75 # Avoid excessive memory usage
76 if ( count( $jobs ) > 10000 ) {
77 JobQueueGroup
::singleton()->push( $jobs );
81 JobQueueGroup
::singleton()->push( $jobs );
86 * @param array|bool $params
89 function __construct( $title, $params = false ) {
90 parent
::__construct( 'fixDoubleRedirect', $title, $params );
91 $this->reason
= $params['reason'];
92 $this->redirTitle
= Title
::newFromText( $params['redirTitle'] );
99 if ( !$this->redirTitle
) {
100 $this->setLastError( 'Invalid title' );
105 $targetRev = Revision
::newFromTitle( $this->title
, false, Revision
::READ_LATEST
);
107 wfDebug( __METHOD__
. ": target redirect already deleted, ignoring\n" );
111 $content = $targetRev->getContent();
112 $currentDest = $content ?
$content->getRedirectTarget() : null;
113 if ( !$currentDest ||
!$currentDest->equals( $this->redirTitle
) ) {
114 wfDebug( __METHOD__
. ": Redirect has changed since the job was queued\n" );
119 // Check for a suppression tag (used e.g. in periodically archived discussions)
120 $mw = MagicWord
::get( 'staticredirect' );
121 if ( $content->matchMagicWord( $mw ) ) {
122 wfDebug( __METHOD__
. ": skipping: suppressed with __STATICREDIRECT__\n" );
127 // Find the current final destination
128 $newTitle = self
::getFinalDestination( $this->redirTitle
);
130 wfDebug( __METHOD__
.
131 ": skipping: single redirect, circular redirect or invalid redirect destination\n" );
135 if ( $newTitle->equals( $this->redirTitle
) ) {
136 // The redirect is already right, no need to change it
137 // This can happen if the page was moved back (say after vandalism)
138 wfDebug( __METHOD__
. " : skipping, already good\n" );
141 // Preserve fragment (bug 14904)
142 $newTitle = Title
::makeTitle( $newTitle->getNamespace(), $newTitle->getDBkey(),
143 $currentDest->getFragment(), $newTitle->getInterwiki() );
146 $newContent = $content->updateRedirect( $newTitle );
148 if ( $newContent->equals( $content ) ) {
149 $this->setLastError( 'Content unchanged???' );
154 $user = $this->getUser();
156 $this->setLastError( 'Invalid user' );
165 $article = WikiPage
::factory( $this->title
);
167 // Messages: double-redirect-fixed-move, double-redirect-fixed-maintenance
168 $reason = wfMessage( 'double-redirect-fixed-' . $this->reason
,
169 $this->redirTitle
->getPrefixedText(), $newTitle->getPrefixedText()
170 )->inContentLanguage()->text();
171 $article->doEditContent( $newContent, $reason, EDIT_UPDATE | EDIT_SUPPRESS_RC
, false, $user );
178 * Get the final destination of a redirect
180 * @param $title Title
182 * @return bool if the specified title is not a redirect, or if it is a circular redirect
184 public static function getFinalDestination( $title ) {
185 $dbw = wfGetDB( DB_MASTER
);
187 // Circular redirect check
188 $seenTitles = array();
192 $titleText = $title->getPrefixedDBkey();
193 if ( isset( $seenTitles[$titleText] ) ) {
194 wfDebug( __METHOD__
, "Circular redirect detected, aborting\n" );
198 $seenTitles[$titleText] = true;
200 if ( $title->isExternal() ) {
201 // If the target is interwiki, we have to break early (bug 40352).
202 // Otherwise it will look up a row in the local page table
203 // with the namespace/page of the interwiki target which can cause
204 // unexpected results (e.g. X -> foo:Bar -> Bar -> .. )
208 $row = $dbw->selectRow(
209 array( 'redirect', 'page' ),
210 array( 'rd_namespace', 'rd_title', 'rd_interwiki' ),
213 'page_namespace' => $title->getNamespace(),
214 'page_title' => $title->getDBkey()
217 # No redirect from here, chain terminates
220 $dest = $title = Title
::makeTitle(
233 * Get a user object for doing edits, from a request-lifetime cache
234 * False will be returned if the user name specified in the
235 * 'double-redirect-fixer' message is invalid.
240 if ( !self
::$user ) {
241 $username = wfMessage( 'double-redirect-fixer' )->inContentLanguage()->text();
242 self
::$user = User
::newFromName( $username );
243 # User::newFromName() can return false on a badly configured wiki.
244 if ( self
::$user && !self
::$user->isLoggedIn() ) {
245 self
::$user->addToDatabase();