includes/specials/SpecialMergeHistory.php

   1 <?php
   2 /**
   3  * Implements Special:MergeHistory
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page allowing users with the appropriate permissions to
  26  * merge article histories, with some restrictions
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 class SpecialMergeHistory extends SpecialPage {
  31         var $mAction, $mTarget, $mDest, $mTimestamp, $mTargetID, $mDestID, $mComment;
  32
  33         /**
  34          * @var Title
  35          */
  36         var $mTargetObj, $mDestObj;
  37
  38         public function __construct() {
  39                 parent::__construct( 'MergeHistory', 'mergehistory' );
  40         }
  41
  42         /**
  43          * @return void
  44          */
  45         private function loadRequestParams() {
  46                 $request = $this->getRequest();
  47                 $this->mAction = $request->getVal( 'action' );
  48                 $this->mTarget = $request->getVal( 'target' );
  49                 $this->mDest = $request->getVal( 'dest' );
  50                 $this->mSubmitted = $request->getBool( 'submitted' );
  51
  52                 $this->mTargetID = intval( $request->getVal( 'targetID' ) );
  53                 $this->mDestID = intval( $request->getVal( 'destID' ) );
  54                 $this->mTimestamp = $request->getVal( 'mergepoint' );
  55                 if( !preg_match( '/[0-9]{14}/', $this->mTimestamp ) ) {
  56                         $this->mTimestamp = '';
  57                 }
  58                 $this->mComment = $request->getText( 'wpComment' );
  59
  60                 $this->mMerge = $request->wasPosted() && $this->getUser()->matchEditToken( $request->getVal( 'wpEditToken' ) );
  61                 // target page
  62                 if( $this->mSubmitted ) {
  63                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
  64                         $this->mDestObj = Title::newFromURL( $this->mDest );
  65                 } else {
  66                         $this->mTargetObj = null;
  67                         $this->mDestObj = null;
  68                 }
  69                 $this->preCacheMessages();
  70         }
  71
  72         /**
  73          * As we use the same small set of messages in various methods and that
  74          * they are called often, we call them once and save them in $this->message
  75          */
  76         function preCacheMessages() {
  77                 // Precache various messages
  78                 if( !isset( $this->message ) ) {
  79                         $this->message['last'] = wfMsgExt( 'last', array( 'escape' ) );
  80                 }
  81         }
  82
  83         public function execute( $par ) {
  84                 $this->checkPermissions();
  85                 $this->checkReadOnly();
  86
  87                 $this->loadRequestParams();
  88
  89                 $this->setHeaders();
  90                 $this->outputHeader();
  91
  92                 if( $this->mTargetID && $this->mDestID && $this->mAction == 'submit' && $this->mMerge ) {
  93                         return $this->merge();
  94                 }
  95
  96                 if ( !$this->mSubmitted ) {
  97                         $this->showMergeForm();
  98                         return;
  99                 }
 100
 101                 $errors = array();
 102                 if ( !$this->mTargetObj instanceof Title ) {
 103                         $errors[] = wfMsgExt( 'mergehistory-invalid-source', array( 'parse' ) );
 104                 } elseif( !$this->mTargetObj->exists() ) {
 105                         $errors[] = wfMsgExt( 'mergehistory-no-source', array( 'parse' ),
 106                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
 107                         );
 108                 }
 109
 110                 if ( !$this->mDestObj instanceof Title ) {
 111                         $errors[] = wfMsgExt( 'mergehistory-invalid-destination', array( 'parse' ) );
 112                 } elseif( !$this->mDestObj->exists() ) {
 113                         $errors[] = wfMsgExt( 'mergehistory-no-destination', array( 'parse' ),
 114                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
 115                         );
 116                 }
 117
 118                 if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
 119                         $errors[] = wfMsgExt( 'mergehistory-same-destination', array( 'parse' ) );
 120                 }
 121
 122                 if ( count( $errors ) ) {
 123                         $this->showMergeForm();
 124                         $this->getOutput()->addHTML( implode( "\n", $errors ) );
 125                 } else {
 126                         $this->showHistory();
 127                 }
 128
 129         }
 130
 131         function showMergeForm() {
 132                 global $wgScript;
 133
 134                 $this->getOutput()->addWikiMsg( 'mergehistory-header' );
 135
 136                 $this->getOutput()->addHTML(
 137                         Xml::openElement( 'form', array(
 138                                 'method' => 'get',
 139                                 'action' => $wgScript ) ) .
 140                         '<fieldset>' .
 141                         Xml::element( 'legend', array(),
 142                                 wfMsg( 'mergehistory-box' ) ) .
 143                         Html::hidden( 'title', $this->getTitle()->getPrefixedDbKey() ) .
 144                         Html::hidden( 'submitted', '1' ) .
 145                         Html::hidden( 'mergepoint', $this->mTimestamp ) .
 146                         Xml::openElement( 'table' ) .
 147                         '<tr>
 148                                 <td>' . Xml::label( wfMsg( 'mergehistory-from' ), 'target' ) . '</td>
 149                                 <td>' . Xml::input( 'target', 30, $this->mTarget, array( 'id' => 'target' ) ) . '</td>
 150                         </tr><tr>
 151                                 <td>' . Xml::label( wfMsg( 'mergehistory-into' ), 'dest' ) . '</td>
 152                                 <td>' . Xml::input( 'dest', 30, $this->mDest, array( 'id' => 'dest' ) ) . '</td>
 153                         </tr><tr><td>' .
 154                         Xml::submitButton( wfMsg( 'mergehistory-go' ) ) .
 155                         '</td></tr>' .
 156                         Xml::closeElement( 'table' ) .
 157                         '</fieldset>' .
 158                         '</form>'
 159                 );
 160         }
 161
 162         private function showHistory() {
 163                 $this->showMergeForm();
 164
 165                 # List all stored revisions
 166                 $revisions = new MergeHistoryPager(
 167                         $this, array(), $this->mTargetObj, $this->mDestObj
 168                 );
 169                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 170
 171                 $out = $this->getOutput();
 172                 $titleObj = $this->getTitle();
 173                 $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
 174                 # Start the form here
 175                 $top = Xml::openElement(
 176                         'form',
 177                         array(
 178                                 'method' => 'post',
 179                                 'action' => $action,
 180                                 'id' => 'merge'
 181                         )
 182                 );
 183                 $out->addHTML( $top );
 184
 185                 if( $haveRevisions ) {
 186                         # Format the user-visible controls (comment field, submission button)
 187                         # in a nice little table
 188                         $table =
 189                                 Xml::openElement( 'fieldset' ) .
 190                                 wfMsgExt( 'mergehistory-merge', array( 'parseinline' ),
 191                                         $this->mTargetObj->getPrefixedText(), $this->mDestObj->getPrefixedText() ) .
 192                                 Xml::openElement( 'table', array( 'id' => 'mw-mergehistory-table' ) ) .
 193                                         '<tr>
 194                                                 <td class="mw-label">' .
 195                                                         Xml::label( wfMsg( 'mergehistory-reason' ), 'wpComment' ) .
 196                                                 '</td>
 197                                                 <td class="mw-input">' .
 198                                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment' ) ) .
 199                                                 '</td>
 200                                         </tr>
 201                                         <tr>
 202                                                 <td>&#160;</td>
 203                                                 <td class="mw-submit">' .
 204                                                         Xml::submitButton( wfMsg( 'mergehistory-submit' ), array( 'name' => 'merge', 'id' => 'mw-merge-submit' ) ) .
 205                                                 '</td>
 206                                         </tr>' .
 207                                 Xml::closeElement( 'table' ) .
 208                                 Xml::closeElement( 'fieldset' );
 209
 210                         $out->addHTML( $table );
 211                 }
 212
 213                 $out->addHTML(
 214                         '<h2 id="mw-mergehistory">' .
 215                         wfMsgHtml( 'mergehistory-list' ) . "</h2>\n"
 216                 );
 217
 218                 if( $haveRevisions ) {
 219                         $out->addHTML( $revisions->getNavigationBar() );
 220                         $out->addHTML( '<ul>' );
 221                         $out->addHTML( $revisions->getBody() );
 222                         $out->addHTML( '</ul>' );
 223                         $out->addHTML( $revisions->getNavigationBar() );
 224                 } else {
 225                         $out->addWikiMsg( 'mergehistory-empty' );
 226                 }
 227
 228                 # Show relevant lines from the deletion log:
 229                 $out->addHTML( '<h2>' . htmlspecialchars( LogPage::logName( 'merge' ) ) . "</h2>\n" );
 230                 LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );
 231
 232                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 233                 # Such would happen if a page was renamed after the form loaded, but before submit
 234                 $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 235                 $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
 236                 $misc .= Html::hidden( 'target', $this->mTarget );
 237                 $misc .= Html::hidden( 'dest', $this->mDest );
 238                 $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
 239                 $misc .= Xml::closeElement( 'form' );
 240                 $out->addHTML( $misc );
 241
 242                 return true;
 243         }
 244
 245         function formatRevisionRow( $row ) {
 246                 $rev = new Revision( $row );
 247
 248                 $stxt = '';
 249                 $last = $this->message['last'];
 250
 251                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 252                 $checkBox = Xml::radio( 'mergepoint', $ts, false );
 253
 254                 $pageLink = Linker::linkKnown(
 255                         $rev->getTitle(),
 256                         htmlspecialchars( $this->getLanguage()->timeanddate( $ts ) ),
 257                         array(),
 258                         array( 'oldid' => $rev->getId() )
 259                 );
 260                 if( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 261                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 262                 }
 263
 264                 # Last link
 265                 if( !$rev->userCan( Revision::DELETED_TEXT, $this->getUser() ) ) {
 266                         $last = $this->message['last'];
 267                 } elseif( isset( $this->prevId[$row->rev_id] ) ) {
 268                         $last = Linker::linkKnown(
 269                                 $rev->getTitle(),
 270                                 $this->message['last'],
 271                                 array(),
 272                                 array(
 273                                         'diff' => $row->rev_id,
 274                                         'oldid' => $this->prevId[$row->rev_id]
 275                                 )
 276                         );
 277                 }
 278
 279                 $userLink = Linker::revUserTools( $rev );
 280
 281                 $size = $row->rev_len;
 282                 if( !is_null( $size ) ) {
 283                         $stxt = Linker::formatRevisionSize( $size );
 284                 }
 285                 $comment = Linker::revComment( $rev );
 286
 287                 return "<li>$checkBox ($last) $pageLink . . $userLink $stxt $comment</li>";
 288         }
 289
 290         function merge() {
 291                 # Get the titles directly from the IDs, in case the target page params
 292                 # were spoofed. The queries are done based on the IDs, so it's best to
 293                 # keep it consistent...
 294                 $targetTitle = Title::newFromID( $this->mTargetID );
 295                 $destTitle = Title::newFromID( $this->mDestID );
 296                 if( is_null( $targetTitle ) || is_null( $destTitle ) ) {
 297                         return false; // validate these
 298                 }
 299                 if( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
 300                         return false;
 301                 }
 302                 # Verify that this timestamp is valid
 303                 # Must be older than the destination page
 304                 $dbw = wfGetDB( DB_MASTER );
 305                 # Get timestamp into DB format
 306                 $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp( $this->mTimestamp ) : '';
 307                 # Max timestamp should be min of destination page
 308                 $maxtimestamp = $dbw->selectField(
 309                         'revision',
 310                         'MIN(rev_timestamp)',
 311                         array( 'rev_page' => $this->mDestID ),
 312                         __METHOD__
 313                 );
 314                 # Destination page must exist with revisions
 315                 if( !$maxtimestamp ) {
 316                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 317                         return false;
 318                 }
 319                 # Get the latest timestamp of the source
 320                 $lasttimestamp = $dbw->selectField(
 321                         array( 'page', 'revision' ),
 322                         'rev_timestamp',
 323                         array( 'page_id' => $this->mTargetID, 'page_latest = rev_id' ),
 324                         __METHOD__
 325                 );
 326                 # $this->mTimestamp must be older than $maxtimestamp
 327                 if( $this->mTimestamp >= $maxtimestamp ) {
 328                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 329                         return false;
 330                 }
 331                 # Update the revisions
 332                 if( $this->mTimestamp ) {
 333                         $timewhere = "rev_timestamp <= {$this->mTimestamp}";
 334                         $timestampLimit = wfTimestamp( TS_MW, $this->mTimestamp );
 335                 } else {
 336                         $timewhere = "rev_timestamp <= {$maxtimestamp}";
 337                         $timestampLimit = wfTimestamp( TS_MW, $lasttimestamp );
 338                 }
 339                 # Do the moving...
 340                 $dbw->update(
 341                         'revision',
 342                         array( 'rev_page' => $this->mDestID ),
 343                         array( 'rev_page' => $this->mTargetID, $timewhere ),
 344                         __METHOD__
 345                 );
 346
 347                 $count = $dbw->affectedRows();
 348                 # Make the source page a redirect if no revisions are left
 349                 $haveRevisions = $dbw->selectField(
 350                         'revision',
 351                         'rev_timestamp',
 352                         array( 'rev_page' => $this->mTargetID  ),
 353                         __METHOD__,
 354                         array( 'FOR UPDATE' )
 355                 );
 356                 if( !$haveRevisions ) {
 357                         if( $this->mComment ) {
 358                                 $comment = wfMsgForContent(
 359                                         'mergehistory-comment',
 360                                         $targetTitle->getPrefixedText(),
 361                                         $destTitle->getPrefixedText(),
 362                                         $this->mComment
 363                                 );
 364                         } else {
 365                                 $comment = wfMsgForContent(
 366                                         'mergehistory-autocomment',
 367                                         $targetTitle->getPrefixedText(),
 368                                         $destTitle->getPrefixedText()
 369                                 );
 370                         }
 371                         $mwRedir = MagicWord::get( 'redirect' );
 372                         $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $destTitle->getPrefixedText() . "]]\n";
 373                         $redirectPage = WikiPage::factory( $targetTitle );
 374                         $redirectRevision = new Revision( array(
 375                                 'page'    => $this->mTargetID,
 376                                 'comment' => $comment,
 377                                 'text'    => $redirectText ) );
 378                         $redirectRevision->insertOn( $dbw );
 379                         $redirectPage->updateRevisionOn( $dbw, $redirectRevision );
 380
 381                         # Now, we record the link from the redirect to the new title.
 382                         # It should have no other outgoing links...
 383                         $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
 384                         $dbw->insert( 'pagelinks',
 385                                 array(
 386                                         'pl_from'      => $this->mDestID,
 387                                         'pl_namespace' => $destTitle->getNamespace(),
 388                                         'pl_title'     => $destTitle->getDBkey() ),
 389                                 __METHOD__
 390                         );
 391                 } else {
 392                         $targetTitle->invalidateCache(); // update histories
 393                 }
 394                 $destTitle->invalidateCache(); // update histories
 395                 # Check if this did anything
 396                 if( !$count ) {
 397                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 398                         return false;
 399                 }
 400                 # Update our logs
 401                 $log = new LogPage( 'merge' );
 402                 $log->addEntry(
 403                         'merge', $targetTitle, $this->mComment,
 404                         array( $destTitle->getPrefixedText(), $timestampLimit )
 405                 );
 406
 407                 $this->getOutput()->addHTML(
 408                         wfMsgExt( 'mergehistory-success', array('parseinline'),
 409                         $targetTitle->getPrefixedText(), $destTitle->getPrefixedText(), $count ) );
 410
 411                 wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );
 412
 413                 return true;
 414         }
 415 }
 416
 417 class MergeHistoryPager extends ReverseChronologicalPager {
 418         public $mForm, $mConds;
 419
 420         function __construct( $form, $conds = array(), $source, $dest ) {
 421                 $this->mForm = $form;
 422                 $this->mConds = $conds;
 423                 $this->title = $source;
 424                 $this->articleID = $source->getArticleID();
 425
 426                 $dbr = wfGetDB( DB_SLAVE );
 427                 $maxtimestamp = $dbr->selectField(
 428                         'revision',
 429                         'MIN(rev_timestamp)',
 430                         array( 'rev_page' => $dest->getArticleID() ),
 431                         __METHOD__
 432                 );
 433                 $this->maxTimestamp = $maxtimestamp;
 434
 435                 parent::__construct( $form->getContext() );
 436         }
 437
 438         function getStartBody() {
 439                 wfProfileIn( __METHOD__ );
 440                 # Do a link batch query
 441                 $this->mResult->seek( 0 );
 442                 $batch = new LinkBatch();
 443                 # Give some pointers to make (last) links
 444                 $this->mForm->prevId = array();
 445                 foreach ( $this->mResult as $row ) {
 446                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 447                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 448
 449                         $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
 450                         if( $rev_id > $row->rev_id ) {
 451                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 452                         } elseif( $rev_id < $row->rev_id ) {
 453                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 454                         }
 455
 456                         $rev_id = $row->rev_id;
 457                 }
 458
 459                 $batch->execute();
 460                 $this->mResult->seek( 0 );
 461
 462                 wfProfileOut( __METHOD__ );
 463                 return '';
 464         }
 465
 466         function formatRow( $row ) {
 467                 return $this->mForm->formatRevisionRow( $row );
 468         }
 469
 470         function getQueryInfo() {
 471                 $conds = $this->mConds;
 472                 $conds['rev_page'] = $this->articleID;
 473                 $conds[] = "rev_timestamp < {$this->maxTimestamp}";
 474                 return array(
 475                         'tables' => array( 'revision', 'page', 'user' ),
 476                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 477                         'conds'  => $conds,
 478                         'join_conds' => array(
 479                                 'page' => Revision::pageJoinCond(),
 480                                 'user' => Revision::userJoinCond() )
 481                 );
 482         }
 483
 484         function getIndexField() {
 485                 return 'rev_timestamp';
 486         }
 487 }