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'] = $this->msg( 'last' )->escaped();
  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                         $this->merge();
  94
  95                         return;
  96                 }
  97
  98                 if ( !$this->mSubmitted ) {
  99                         $this->showMergeForm();
 100
 101                         return;
 102                 }
 103
 104                 $errors = array();
 105                 if ( !$this->mTargetObj instanceof Title ) {
 106                         $errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();
 107                 } elseif ( !$this->mTargetObj->exists() ) {
 108                         $errors[] = $this->msg( 'mergehistory-no-source', array( 'parse' ),
 109                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
 110                         )->parseAsBlock();
 111                 }
 112
 113                 if ( !$this->mDestObj instanceof Title ) {
 114                         $errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();
 115                 } elseif ( !$this->mDestObj->exists() ) {
 116                         $errors[] = $this->msg( 'mergehistory-no-destination', array( 'parse' ),
 117                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
 118                         )->parseAsBlock();
 119                 }
 120
 121                 if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
 122                         $errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();
 123                 }
 124
 125                 if ( count( $errors ) ) {
 126                         $this->showMergeForm();
 127                         $this->getOutput()->addHTML( implode( "\n", $errors ) );
 128                 } else {
 129                         $this->showHistory();
 130                 }
 131         }
 132
 133         function showMergeForm() {
 134                 global $wgScript;
 135
 136                 $this->getOutput()->addWikiMsg( 'mergehistory-header' );
 137
 138                 $this->getOutput()->addHTML(
 139                         Xml::openElement( 'form', array(
 140                                 'method' => 'get',
 141                                 'action' => $wgScript ) ) .
 142                                 '<fieldset>' .
 143                                 Xml::element( 'legend', array(),
 144                                         $this->msg( 'mergehistory-box' )->text() ) .
 145                                 Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) .
 146                                 Html::hidden( 'submitted', '1' ) .
 147                                 Html::hidden( 'mergepoint', $this->mTimestamp ) .
 148                                 Xml::openElement( 'table' ) .
 149                                 '<tr>
 150                                 <td>' . Xml::label( $this->msg( 'mergehistory-from' )->text(), 'target' ) . '</td>
 151                                 <td>' . Xml::input( 'target', 30, $this->mTarget, array( 'id' => 'target' ) ) . '</td>
 152                         </tr><tr>
 153                                 <td>' . Xml::label( $this->msg( 'mergehistory-into' )->text(), 'dest' ) . '</td>
 154                                 <td>' . Xml::input( 'dest', 30, $this->mDest, array( 'id' => 'dest' ) ) . '</td>
 155                         </tr><tr><td>' .
 156                                 Xml::submitButton( $this->msg( 'mergehistory-go' )->text() ) .
 157                                 '</td></tr>' .
 158                                 Xml::closeElement( 'table' ) .
 159                                 '</fieldset>' .
 160                                 '</form>'
 161                 );
 162         }
 163
 164         private function showHistory() {
 165                 $this->showMergeForm();
 166
 167                 # List all stored revisions
 168                 $revisions = new MergeHistoryPager(
 169                         $this, array(), $this->mTargetObj, $this->mDestObj
 170                 );
 171                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 172
 173                 $out = $this->getOutput();
 174                 $titleObj = $this->getTitle();
 175                 $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
 176                 # Start the form here
 177                 $top = Xml::openElement(
 178                         'form',
 179                         array(
 180                                 'method' => 'post',
 181                                 'action' => $action,
 182                                 'id' => 'merge'
 183                         )
 184                 );
 185                 $out->addHTML( $top );
 186
 187                 if ( $haveRevisions ) {
 188                         # Format the user-visible controls (comment field, submission button)
 189                         # in a nice little table
 190                         $table =
 191                                 Xml::openElement( 'fieldset' ) .
 192                                         $this->msg( 'mergehistory-merge', $this->mTargetObj->getPrefixedText(),
 193                                                 $this->mDestObj->getPrefixedText() )->parse() .
 194                                         Xml::openElement( 'table', array( 'id' => 'mw-mergehistory-table' ) ) .
 195                                         '<tr>
 196                                                 <td class="mw-label">' .
 197                                         Xml::label( $this->msg( 'mergehistory-reason' )->text(), 'wpComment' ) .
 198                                         '</td>
 199                                         <td class="mw-input">' .
 200                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment' ) ) .
 201                                         '</td>
 202                                         </tr>
 203                                         <tr>
 204                                                 <td>&#160;</td>
 205                                                 <td class="mw-submit">' .
 206                                         Xml::submitButton( $this->msg( 'mergehistory-submit' )->text(), array( 'name' => 'merge', 'id' => 'mw-merge-submit' ) ) .
 207                                         '</td>
 208                                         </tr>' .
 209                                         Xml::closeElement( 'table' ) .
 210                                         Xml::closeElement( 'fieldset' );
 211
 212                         $out->addHTML( $table );
 213                 }
 214
 215                 $out->addHTML(
 216                         '<h2 id="mw-mergehistory">' .
 217                                 $this->msg( 'mergehistory-list' )->escaped() . "</h2>\n"
 218                 );
 219
 220                 if ( $haveRevisions ) {
 221                         $out->addHTML( $revisions->getNavigationBar() );
 222                         $out->addHTML( '<ul>' );
 223                         $out->addHTML( $revisions->getBody() );
 224                         $out->addHTML( '</ul>' );
 225                         $out->addHTML( $revisions->getNavigationBar() );
 226                 } else {
 227                         $out->addWikiMsg( 'mergehistory-empty' );
 228                 }
 229
 230                 # Show relevant lines from the merge log:
 231                 $mergeLogPage = new LogPage( 'merge' );
 232                 $out->addHTML( '<h2>' . $mergeLogPage->getName()->escaped() . "</h2>\n" );
 233                 LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );
 234
 235                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 236                 # Such would happen if a page was renamed after the form loaded, but before submit
 237                 $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 238                 $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
 239                 $misc .= Html::hidden( 'target', $this->mTarget );
 240                 $misc .= Html::hidden( 'dest', $this->mDest );
 241                 $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
 242                 $misc .= Xml::closeElement( 'form' );
 243                 $out->addHTML( $misc );
 244
 245                 return true;
 246         }
 247
 248         function formatRevisionRow( $row ) {
 249                 $rev = new Revision( $row );
 250
 251                 $stxt = '';
 252                 $last = $this->message['last'];
 253
 254                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 255                 $checkBox = Xml::radio( 'mergepoint', $ts, false );
 256
 257                 $user = $this->getUser();
 258
 259                 $pageLink = Linker::linkKnown(
 260                         $rev->getTitle(),
 261                         htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) ),
 262                         array(),
 263                         array( 'oldid' => $rev->getId() )
 264                 );
 265                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 266                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 267                 }
 268
 269                 # Last link
 270                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 271                         $last = $this->message['last'];
 272                 } elseif ( isset( $this->prevId[$row->rev_id] ) ) {
 273                         $last = Linker::linkKnown(
 274                                 $rev->getTitle(),
 275                                 $this->message['last'],
 276                                 array(),
 277                                 array(
 278                                         'diff' => $row->rev_id,
 279                                         'oldid' => $this->prevId[$row->rev_id]
 280                                 )
 281                         );
 282                 }
 283
 284                 $userLink = Linker::revUserTools( $rev );
 285
 286                 $size = $row->rev_len;
 287                 if ( !is_null( $size ) ) {
 288                         $stxt = Linker::formatRevisionSize( $size );
 289                 }
 290                 $comment = Linker::revComment( $rev );
 291
 292                 return Html::rawElement( 'li', array(),
 293                         $this->msg( 'mergehistory-revisionrow' )->rawParams( $checkBox, $last, $pageLink, $userLink, $stxt, $comment )->escaped() );
 294         }
 295
 296         function merge() {
 297                 # Get the titles directly from the IDs, in case the target page params
 298                 # were spoofed. The queries are done based on the IDs, so it's best to
 299                 # keep it consistent...
 300                 $targetTitle = Title::newFromID( $this->mTargetID );
 301                 $destTitle = Title::newFromID( $this->mDestID );
 302                 if ( is_null( $targetTitle ) || is_null( $destTitle ) ) {
 303                         return false; // validate these
 304                 }
 305                 if ( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
 306                         return false;
 307                 }
 308                 # Verify that this timestamp is valid
 309                 # Must be older than the destination page
 310                 $dbw = wfGetDB( DB_MASTER );
 311                 # Get timestamp into DB format
 312                 $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp( $this->mTimestamp ) : '';
 313                 # Max timestamp should be min of destination page
 314                 $maxtimestamp = $dbw->selectField(
 315                         'revision',
 316                         'MIN(rev_timestamp)',
 317                         array( 'rev_page' => $this->mDestID ),
 318                         __METHOD__
 319                 );
 320                 # Destination page must exist with revisions
 321                 if ( !$maxtimestamp ) {
 322                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 323
 324                         return false;
 325                 }
 326                 # Get the latest timestamp of the source
 327                 $lasttimestamp = $dbw->selectField(
 328                         array( 'page', 'revision' ),
 329                         'rev_timestamp',
 330                         array( 'page_id' => $this->mTargetID, 'page_latest = rev_id' ),
 331                         __METHOD__
 332                 );
 333                 # $this->mTimestamp must be older than $maxtimestamp
 334                 if ( $this->mTimestamp >= $maxtimestamp ) {
 335                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 336
 337                         return false;
 338                 }
 339                 # Update the revisions
 340                 if ( $this->mTimestamp ) {
 341                         $timewhere = "rev_timestamp <= {$this->mTimestamp}";
 342                         $timestampLimit = wfTimestamp( TS_MW, $this->mTimestamp );
 343                 } else {
 344                         $timewhere = "rev_timestamp <= {$maxtimestamp}";
 345                         $timestampLimit = wfTimestamp( TS_MW, $lasttimestamp );
 346                 }
 347                 # Do the moving...
 348                 $dbw->update(
 349                         'revision',
 350                         array( 'rev_page' => $this->mDestID ),
 351                         array( 'rev_page' => $this->mTargetID, $timewhere ),
 352                         __METHOD__
 353                 );
 354
 355                 $count = $dbw->affectedRows();
 356                 # Make the source page a redirect if no revisions are left
 357                 $haveRevisions = $dbw->selectField(
 358                         'revision',
 359                         'rev_timestamp',
 360                         array( 'rev_page' => $this->mTargetID ),
 361                         __METHOD__,
 362                         array( 'FOR UPDATE' )
 363                 );
 364                 if ( !$haveRevisions ) {
 365                         if ( $this->mComment ) {
 366                                 $comment = $this->msg(
 367                                         'mergehistory-comment',
 368                                         $targetTitle->getPrefixedText(),
 369                                         $destTitle->getPrefixedText(),
 370                                         $this->mComment
 371                                 )->inContentLanguage()->text();
 372                         } else {
 373                                 $comment = $this->msg(
 374                                         'mergehistory-autocomment',
 375                                         $targetTitle->getPrefixedText(),
 376                                         $destTitle->getPrefixedText()
 377                                 )->inContentLanguage()->text();
 378                         }
 379
 380                         $contentHandler = ContentHandler::getForTitle( $targetTitle );
 381                         $redirectContent = $contentHandler->makeRedirectContent( $destTitle );
 382
 383                         if ( $redirectContent ) {
 384                                 $redirectPage = WikiPage::factory( $targetTitle );
 385                                 $redirectRevision = new Revision( array(
 386                                         'title' => $targetTitle,
 387                                         'page' => $this->mTargetID,
 388                                         'comment' => $comment,
 389                                         'content' => $redirectContent ) );
 390                                 $redirectRevision->insertOn( $dbw );
 391                                 $redirectPage->updateRevisionOn( $dbw, $redirectRevision );
 392
 393                                 # Now, we record the link from the redirect to the new title.
 394                                 # It should have no other outgoing links...
 395                                 $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
 396                                 $dbw->insert( 'pagelinks',
 397                                         array(
 398                                                 'pl_from' => $this->mDestID,
 399                                                 'pl_namespace' => $destTitle->getNamespace(),
 400                                                 'pl_title' => $destTitle->getDBkey() ),
 401                                         __METHOD__
 402                                 );
 403                         } else {
 404                                 // would be nice to show a warning if we couldn't create a redirect
 405                         }
 406                 } else {
 407                         $targetTitle->invalidateCache(); // update histories
 408                 }
 409                 $destTitle->invalidateCache(); // update histories
 410                 # Check if this did anything
 411                 if ( !$count ) {
 412                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 413
 414                         return false;
 415                 }
 416                 # Update our logs
 417                 $log = new LogPage( 'merge' );
 418                 $log->addEntry(
 419                         'merge', $targetTitle, $this->mComment,
 420                         array( $destTitle->getPrefixedText(), $timestampLimit )
 421                 );
 422
 423                 $this->getOutput()->addWikiMsg( 'mergehistory-success',
 424                         $targetTitle->getPrefixedText(), $destTitle->getPrefixedText(), $count );
 425
 426                 wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );
 427
 428                 return true;
 429         }
 430
 431         protected function getGroupName() {
 432                 return 'pagetools';
 433         }
 434 }
 435
 436 class MergeHistoryPager extends ReverseChronologicalPager {
 437         public $mForm, $mConds;
 438
 439         function __construct( $form, $conds = array(), $source, $dest ) {
 440                 $this->mForm = $form;
 441                 $this->mConds = $conds;
 442                 $this->title = $source;
 443                 $this->articleID = $source->getArticleID();
 444
 445                 $dbr = wfGetDB( DB_SLAVE );
 446                 $maxtimestamp = $dbr->selectField(
 447                         'revision',
 448                         'MIN(rev_timestamp)',
 449                         array( 'rev_page' => $dest->getArticleID() ),
 450                         __METHOD__
 451                 );
 452                 $this->maxTimestamp = $maxtimestamp;
 453
 454                 parent::__construct( $form->getContext() );
 455         }
 456
 457         function getStartBody() {
 458                 wfProfileIn( __METHOD__ );
 459                 # Do a link batch query
 460                 $this->mResult->seek( 0 );
 461                 $batch = new LinkBatch();
 462                 # Give some pointers to make (last) links
 463                 $this->mForm->prevId = array();
 464                 foreach ( $this->mResult as $row ) {
 465                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 466                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 467
 468                         $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
 469                         if ( $rev_id > $row->rev_id ) {
 470                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 471                         } elseif ( $rev_id < $row->rev_id ) {
 472                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 473                         }
 474
 475                         $rev_id = $row->rev_id;
 476                 }
 477
 478                 $batch->execute();
 479                 $this->mResult->seek( 0 );
 480
 481                 wfProfileOut( __METHOD__ );
 482
 483                 return '';
 484         }
 485
 486         function formatRow( $row ) {
 487                 return $this->mForm->formatRevisionRow( $row );
 488         }
 489
 490         function getQueryInfo() {
 491                 $conds = $this->mConds;
 492                 $conds['rev_page'] = $this->articleID;
 493                 $conds[] = "rev_timestamp < {$this->maxTimestamp}";
 494
 495                 return array(
 496                         'tables' => array( 'revision', 'page', 'user' ),
 497                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 498                         'conds' => $conds,
 499                         'join_conds' => array(
 500                                 'page' => Revision::pageJoinCond(),
 501                                 'user' => Revision::userJoinCond() )
 502                 );
 503         }
 504
 505         function getIndexField() {
 506                 return 'rev_timestamp';
 507         }
 508 }