includes/specials/SpecialMergeHistory.php

   1 <?php
   2 /**
   3  * Special page allowing users with the appropriate permissions to
   4  * merge article histories, with some restrictions
   5  *
   6  * @file
   7  * @ingroup SpecialPage
   8  */
   9
  10 /**
  11  * Constructor
  12  */
  13 function wfSpecialMergehistory( $par ) {
  14         global $wgRequest;
  15
  16         $form = new MergehistoryForm( $wgRequest, $par );
  17         $form->execute();
  18 }
  19
  20 /**
  21  * The HTML form for Special:MergeHistory, which allows users with the appropriate
  22  * permissions to view and restore deleted content.
  23  * @ingroup SpecialPage
  24  */
  25 class MergehistoryForm {
  26         var $mAction, $mTarget, $mDest, $mTimestamp, $mTargetID, $mDestID, $mComment;
  27         var $mTargetObj, $mDestObj;
  28
  29         function MergehistoryForm( $request, $par = "" ) {
  30                 global $wgUser;
  31
  32                 $this->mAction = $request->getVal( 'action' );
  33                 $this->mTarget = $request->getVal( 'target' );
  34                 $this->mDest = $request->getVal( 'dest' );
  35                 $this->mSubmitted = $request->getBool( 'submitted' );
  36
  37                 $this->mTargetID = intval( $request->getVal( 'targetID' ) );
  38                 $this->mDestID = intval( $request->getVal( 'destID' ) );
  39                 $this->mTimestamp = $request->getVal( 'mergepoint' );
  40                 if( !preg_match("/[0-9]{14}/",$this->mTimestamp) ) {
  41                         $this->mTimestamp = '';
  42                 }
  43                 $this->mComment = $request->getText( 'wpComment' );
  44
  45                 $this->mMerge = $request->wasPosted() && $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
  46                 // target page
  47                 if( $this->mSubmitted ) {
  48                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
  49                         $this->mDestObj = Title::newFromURL( $this->mDest );
  50                 } else {
  51                         $this->mTargetObj = null;
  52                         $this->mDestObj = null;
  53                 }
  54
  55                 $this->preCacheMessages();
  56         }
  57
  58         /**
  59          * As we use the same small set of messages in various methods and that
  60          * they are called often, we call them once and save them in $this->message
  61          */
  62         function preCacheMessages() {
  63                 // Precache various messages
  64                 if( !isset( $this->message ) ) {
  65                         $this->message['last'] = wfMsgExt( 'last', array( 'escape') );
  66                 }
  67         }
  68
  69         function execute() {
  70                 global $wgOut, $wgUser;
  71
  72                 $wgOut->setPagetitle( wfMsgHtml( "mergehistory" ) );
  73
  74                 if( $this->mTargetID && $this->mDestID && $this->mAction=="submit" && $this->mMerge ) {
  75                         return $this->merge();
  76                 }
  77
  78                 if ( !$this->mSubmitted ) {
  79                         $this->showMergeForm();
  80                         return;
  81                 }
  82
  83                 $errors = array();
  84                 if ( !$this->mTargetObj instanceof Title ) {
  85                         $errors[] = wfMsgExt( 'mergehistory-invalid-source', array( 'parse' ) );
  86                 } elseif( !$this->mTargetObj->exists() ) {
  87                         $errors[] = wfMsgExt( 'mergehistory-no-source', array( 'parse' ),
  88                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
  89                         );
  90                 }
  91
  92                 if ( !$this->mDestObj instanceof Title) {
  93                         $errors[] = wfMsgExt( 'mergehistory-invalid-destination', array( 'parse' ) );
  94                 } elseif( !$this->mDestObj->exists() ) {
  95                         $errors[] = wfMsgExt( 'mergehistory-no-destination', array( 'parse' ),
  96                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
  97                         );
  98                 }
  99
 100                 if ( $this->mTargetObj->equals( $this->mDestObj ) ) {
 101                         $errors[] = wfMsgExt( 'mergehistory-same-destination', array( 'parse' ) );
 102                 }
 103
 104                 if ( count( $errors ) ) {
 105                         $this->showMergeForm();
 106                         $wgOut->addHTML( implode( "\n", $errors ) );
 107                 } else {
 108                         $this->showHistory();
 109                 }
 110
 111         }
 112
 113         function showMergeForm() {
 114                 global $wgOut, $wgScript;
 115
 116                 $wgOut->addWikiMsg( 'mergehistory-header' );
 117
 118                 $wgOut->addHTML(
 119                         Xml::openElement( 'form', array(
 120                                 'method' => 'get',
 121                                 'action' => $wgScript ) ) .
 122                         '<fieldset>' .
 123                         Xml::element( 'legend', array(),
 124                                 wfMsg( 'mergehistory-box' ) ) .
 125                         Xml::hidden( 'title',
 126                                 SpecialPage::getTitleFor( 'Mergehistory' )->getPrefixedDbKey() ) .
 127                         Xml::hidden( 'submitted', '1' ) .
 128                         Xml::hidden( 'mergepoint', $this->mTimestamp ) .
 129                         Xml::openElement( 'table' ) .
 130                         "<tr>
 131                                 <td>".Xml::label( wfMsg( 'mergehistory-from' ), 'target' )."</td>
 132                                 <td>".Xml::input( 'target', 30, $this->mTarget, array('id'=>'target') )."</td>
 133                         </tr><tr>
 134                                 <td>".Xml::label( wfMsg( 'mergehistory-into' ), 'dest' )."</td>
 135                                 <td>".Xml::input( 'dest', 30, $this->mDest, array('id'=>'dest') )."</td>
 136                         </tr><tr><td>" .
 137                         Xml::submitButton( wfMsg( 'mergehistory-go' ) ) .
 138                         "</td></tr>" .
 139                         Xml::closeElement( 'table' ) .
 140                         '</fieldset>' .
 141                         '</form>' );
 142         }
 143
 144         private function showHistory() {
 145                 global $wgLang, $wgContLang, $wgUser, $wgOut;
 146
 147                 $this->sk = $wgUser->getSkin();
 148
 149                 $wgOut->setPagetitle( wfMsg( "mergehistory" ) );
 150
 151                 $this->showMergeForm();
 152
 153                 # List all stored revisions
 154                 $revisions = new MergeHistoryPager( $this, array(), $this->mTargetObj, $this->mDestObj );
 155                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 156
 157                 $titleObj = SpecialPage::getTitleFor( "Mergehistory" );
 158                 $action = $titleObj->getLocalURL( "action=submit" );
 159                 # Start the form here
 160                 $top = Xml::openElement( 'form', array( 'method' => 'post', 'action' => $action, 'id' => 'merge' ) );
 161                 $wgOut->addHTML( $top );
 162
 163                 if( $haveRevisions ) {
 164                         # Format the user-visible controls (comment field, submission button)
 165                         # in a nice little table
 166                         $align = $wgContLang->isRtl() ? 'left' : 'right';
 167                         $table =
 168                                 Xml::openElement( 'fieldset' ) .
 169                                 Xml::openElement( 'table' ) .
 170                                         "<tr>
 171                                                 <td colspan='2'>" .
 172                                                         wfMsgExt( 'mergehistory-merge', array('parseinline'),
 173                                                                 $this->mTargetObj->getPrefixedText(), $this->mDestObj->getPrefixedText() ) .
 174                                                 "</td>
 175                                         </tr>
 176                                         <tr>
 177                                                 <td align='$align'>" .
 178                                                         Xml::label( wfMsg( 'undeletecomment' ), 'wpComment' ) .
 179                                                 "</td>
 180                                                 <td>" .
 181                                                         Xml::input( 'wpComment', 50, $this->mComment ) .
 182                                                 "</td>
 183                                         </tr>
 184                                         <tr>
 185                                                 <td>&nbsp;</td>
 186                                                 <td>" .
 187                                                         Xml::submitButton( wfMsg( 'mergehistory-submit' ), array( 'name' => 'merge', 'id' => 'mw-merge-submit' ) ) .
 188                                                 "</td>
 189                                         </tr>" .
 190                                 Xml::closeElement( 'table' ) .
 191                                 Xml::closeElement( 'fieldset' );
 192
 193                         $wgOut->addHTML( $table );
 194                 }
 195
 196                 $wgOut->addHTML( "<h2 id=\"mw-mergehistory\">" . wfMsgHtml( "mergehistory-list" ) . "</h2>\n" );
 197
 198                 if( $haveRevisions ) {
 199                         $wgOut->addHTML( $revisions->getNavigationBar() );
 200                         $wgOut->addHTML( "<ul>" );
 201                         $wgOut->addHTML( $revisions->getBody() );
 202                         $wgOut->addHTML( "</ul>" );
 203                         $wgOut->addHTML( $revisions->getNavigationBar() );
 204                 } else {
 205                         $wgOut->addWikiMsg( "mergehistory-empty" );
 206                 }
 207
 208                 # Show relevant lines from the deletion log:
 209                 $wgOut->addHTML( "<h2>" . htmlspecialchars( LogPage::logName( 'merge' ) ) . "</h2>\n" );
 210                 LogEventsList::showLogExtract( $wgOut, 'merge', $this->mTargetObj->getPrefixedText() );
 211
 212                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 213                 # Such would happen if a page was renamed after the form loaded, but before submit
 214                 $misc = Xml::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 215                 $misc .= Xml::hidden( 'destID', $this->mDestObj->getArticleID() );
 216                 $misc .= Xml::hidden( 'target', $this->mTarget );
 217                 $misc .= Xml::hidden( 'dest', $this->mDest );
 218                 $misc .= Xml::hidden( 'wpEditToken', $wgUser->editToken() );
 219                 $misc .= Xml::closeElement( 'form' );
 220                 $wgOut->addHTML( $misc );
 221
 222                 return true;
 223         }
 224
 225         function formatRevisionRow( $row ) {
 226                 global $wgUser, $wgLang;
 227
 228                 $rev = new Revision( $row );
 229
 230                 $stxt = '';
 231                 $last = $this->message['last'];
 232
 233                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 234                 $checkBox = Xml::radio( "mergepoint", $ts, false );
 235
 236                 $pageLink = $this->sk->makeKnownLinkObj( $rev->getTitle(),
 237                         htmlspecialchars( $wgLang->timeanddate( $ts ) ), 'oldid=' . $rev->getId() );
 238                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 239                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 240                 }
 241
 242                 # Last link
 243                 if( !$rev->userCan( Revision::DELETED_TEXT ) )
 244                         $last = $this->message['last'];
 245                 else if( isset($this->prevId[$row->rev_id]) )
 246                         $last = $this->sk->makeKnownLinkObj( $rev->getTitle(), $this->message['last'],
 247                                 "diff=" . $row->rev_id . "&oldid=" . $this->prevId[$row->rev_id] );
 248
 249                 $userLink = $this->sk->revUserTools( $rev );
 250
 251                 if(!is_null($size = $row->rev_len)) {
 252                         $stxt = $this->sk->formatRevisionSize( $size );
 253                 }
 254                 $comment = $this->sk->revComment( $rev );
 255
 256                 return "<li>$checkBox ($last) $pageLink . . $userLink $stxt $comment</li>";
 257         }
 258
 259         /**
 260          * Fetch revision text link if it's available to all users
 261          * @return string
 262          */
 263         function getPageLink( $row, $titleObj, $ts, $target ) {
 264                 global $wgLang;
 265
 266                 if( !$this->userCan($row, Revision::DELETED_TEXT) ) {
 267                         return '<span class="history-deleted">' . $wgLang->timeanddate( $ts, true ) . '</span>';
 268                 } else {
 269                         $link = $this->sk->makeKnownLinkObj( $titleObj,
 270                                 $wgLang->timeanddate( $ts, true ), "target=$target&timestamp=$ts" );
 271                         if( $this->isDeleted($row, Revision::DELETED_TEXT) )
 272                                 $link = '<span class="history-deleted">' . $link . '</span>';
 273                         return $link;
 274                 }
 275         }
 276
 277         function merge() {
 278                 global $wgOut, $wgUser;
 279                 # Get the titles directly from the IDs, in case the target page params
 280                 # were spoofed. The queries are done based on the IDs, so it's best to
 281                 # keep it consistent...
 282                 $targetTitle = Title::newFromID( $this->mTargetID );
 283                 $destTitle = Title::newFromID( $this->mDestID );
 284                 if( is_null($targetTitle) || is_null($destTitle) )
 285                         return false; // validate these
 286                 if( $targetTitle->getArticleId() == $destTitle->getArticleId() )
 287                         return false;
 288                 # Verify that this timestamp is valid
 289                 # Must be older than the destination page
 290                 $dbw = wfGetDB( DB_MASTER );
 291                 # Get timestamp into DB format
 292                 $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp($this->mTimestamp) : '';
 293                 # Max timestamp should be min of destination page
 294                 $maxtimestamp = $dbw->selectField( 'revision', 'MIN(rev_timestamp)',
 295                         array('rev_page' => $this->mDestID ),
 296                         __METHOD__ );
 297                 # Destination page must exist with revisions
 298                 if( !$maxtimestamp ) {
 299                         $wgOut->addWikiMsg('mergehistory-fail');
 300                         return false;
 301                 }
 302                 # Get the latest timestamp of the source
 303                 $lasttimestamp = $dbw->selectField( array('page','revision'),
 304                         'rev_timestamp',
 305                         array('page_id' => $this->mTargetID, 'page_latest = rev_id' ),
 306                         __METHOD__ );
 307                 # $this->mTimestamp must be older than $maxtimestamp
 308                 if( $this->mTimestamp >= $maxtimestamp ) {
 309                         $wgOut->addWikiMsg('mergehistory-fail');
 310                         return false;
 311                 }
 312                 # Update the revisions
 313                 if( $this->mTimestamp ) {
 314                         $timewhere = "rev_timestamp <= {$this->mTimestamp}";
 315                         $TimestampLimit = wfTimestamp(TS_MW,$this->mTimestamp);
 316                 } else {
 317                         $timewhere = "rev_timestamp <= {$maxtimestamp}";
 318                         $TimestampLimit = wfTimestamp(TS_MW,$lasttimestamp);
 319                 }
 320                 # Do the moving...
 321                 $dbw->update( 'revision',
 322                         array( 'rev_page' => $this->mDestID ),
 323                         array( 'rev_page' => $this->mTargetID,
 324                                 $timewhere ),
 325                         __METHOD__ );
 326
 327                 $count = $dbw->affectedRows();
 328                 # Make the source page a redirect if no revisions are left
 329                 $haveRevisions = $dbw->selectField( 'revision',
 330                         'rev_timestamp',
 331                         array( 'rev_page' => $this->mTargetID  ),
 332                         __METHOD__,
 333                         array( 'FOR UPDATE' ) );
 334                 if( !$haveRevisions ) {
 335                         if( $this->mComment ) {
 336                                 $comment = wfMsgForContent( 'mergehistory-comment', $targetTitle->getPrefixedText(),
 337                                         $destTitle->getPrefixedText(), $this->mComment );
 338                         } else {
 339                                 $comment = wfMsgForContent( 'mergehistory-autocomment', $targetTitle->getPrefixedText(),
 340                                         $destTitle->getPrefixedText() );
 341                         }
 342                         $mwRedir = MagicWord::get( 'redirect' );
 343                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $destTitle->getPrefixedText() . "]]\n";
 344                         $redirectArticle = new Article( $targetTitle );
 345                         $redirectRevision = new Revision( array(
 346                                 'page'    => $this->mTargetID,
 347                                 'comment' => $comment,
 348                                 'text'    => $redirectText ) );
 349                         $redirectRevision->insertOn( $dbw );
 350                         $redirectArticle->updateRevisionOn( $dbw, $redirectRevision );
 351
 352                         # Now, we record the link from the redirect to the new title.
 353                         # It should have no other outgoing links...
 354                         $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
 355                         $dbw->insert( 'pagelinks',
 356                                 array(
 357                                         'pl_from'      => $this->mDestID,
 358                                         'pl_namespace' => $destTitle->getNamespace(),
 359                                         'pl_title'     => $destTitle->getDBkey() ),
 360                                 __METHOD__ );
 361                 } else {
 362                         $targetTitle->invalidateCache(); // update histories
 363                 }
 364                 $destTitle->invalidateCache(); // update histories
 365                 # Check if this did anything
 366                 if( !$count ) {
 367                         $wgOut->addWikiMsg('mergehistory-fail');
 368                         return false;
 369                 }
 370                 # Update our logs
 371                 $log = new LogPage( 'merge' );
 372                 $log->addEntry( 'merge', $targetTitle, $this->mComment,
 373                         array($destTitle->getPrefixedText(),$TimestampLimit) );
 374
 375                 $wgOut->addHTML( wfMsgExt( 'mergehistory-success', array('parseinline'),
 376                         $targetTitle->getPrefixedText(), $destTitle->getPrefixedText(), $count ) );
 377
 378                 wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );
 379
 380                 return true;
 381         }
 382 }
 383
 384 class MergeHistoryPager extends ReverseChronologicalPager {
 385         public $mForm, $mConds;
 386
 387         function __construct( $form, $conds = array(), $source, $dest ) {
 388                 $this->mForm = $form;
 389                 $this->mConds = $conds;
 390                 $this->title = $source;
 391                 $this->articleID = $source->getArticleID();
 392
 393                 $dbr = wfGetDB( DB_SLAVE );
 394                 $maxtimestamp = $dbr->selectField( 'revision', 'MIN(rev_timestamp)',
 395                         array('rev_page' => $dest->getArticleID() ),
 396                         __METHOD__ );
 397                 $this->maxTimestamp = $maxtimestamp;
 398
 399                 parent::__construct();
 400         }
 401
 402         function getStartBody() {
 403                 wfProfileIn( __METHOD__ );
 404                 # Do a link batch query
 405                 $this->mResult->seek( 0 );
 406                 $batch = new LinkBatch();
 407                 # Give some pointers to make (last) links
 408                 $this->mForm->prevId = array();
 409                 while( $row = $this->mResult->fetchObject() ) {
 410                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->rev_user_text ) );
 411                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->rev_user_text ) );
 412
 413                         $rev_id = isset($rev_id) ? $rev_id : $row->rev_id;
 414                         if( $rev_id > $row->rev_id )
 415                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 416                         else if( $rev_id < $row->rev_id )
 417                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 418
 419                         $rev_id = $row->rev_id;
 420                 }
 421
 422                 $batch->execute();
 423                 $this->mResult->seek( 0 );
 424
 425                 wfProfileOut( __METHOD__ );
 426                 return '';
 427         }
 428
 429         function formatRow( $row ) {
 430                 $block = new Block;
 431                 return $this->mForm->formatRevisionRow( $row );
 432         }
 433
 434         function getQueryInfo() {
 435                 $conds = $this->mConds;
 436                 $conds['rev_page'] = $this->articleID;
 437                 $conds[] = 'page_id = rev_page';
 438                 $conds[] = "rev_timestamp < {$this->maxTimestamp}";
 439                 return array(
 440                         'tables' => array('revision','page'),
 441                         'fields' => array( 'rev_minor_edit', 'rev_timestamp', 'rev_user', 'rev_user_text', 'rev_comment',
 442                                  'rev_id', 'rev_page', 'rev_text_id', 'rev_len', 'rev_deleted' ),
 443                         'conds' => $conds
 444                 );
 445         }
 446
 447         function getIndexField() {
 448                 return 'rev_timestamp';
 449         }
 450 }