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 string */
  32         protected $mAction;
  33
  34         /** @var string */
  35         protected $mTarget;
  36
  37         /** @var string */
  38         protected $mDest;
  39
  40         /** @var string */
  41         protected $mTimestamp;
  42
  43         /** @var int */
  44         protected $mTargetID;
  45
  46         /** @var int */
  47         protected $mDestID;
  48
  49         /** @var string */
  50         protected $mComment;
  51
  52         /** @var bool Was posted? */
  53         protected $mMerge;
  54
  55         /** @var bool Was submitted? */
  56         protected $mSubmitted;
  57
  58         /** @var Title */
  59         protected $mTargetObj;
  60
  61         /** @var Title */
  62         protected $mDestObj;
  63
  64         public function __construct() {
  65                 parent::__construct( 'MergeHistory', 'mergehistory' );
  66         }
  67
  68         /**
  69          * @return void
  70          */
  71         private function loadRequestParams() {
  72                 $request = $this->getRequest();
  73                 $this->mAction = $request->getVal( 'action' );
  74                 $this->mTarget = $request->getVal( 'target' );
  75                 $this->mDest = $request->getVal( 'dest' );
  76                 $this->mSubmitted = $request->getBool( 'submitted' );
  77
  78                 $this->mTargetID = intval( $request->getVal( 'targetID' ) );
  79                 $this->mDestID = intval( $request->getVal( 'destID' ) );
  80                 $this->mTimestamp = $request->getVal( 'mergepoint' );
  81                 if ( !preg_match( '/[0-9]{14}/', $this->mTimestamp ) ) {
  82                         $this->mTimestamp = '';
  83                 }
  84                 $this->mComment = $request->getText( 'wpComment' );
  85
  86                 $this->mMerge = $request->wasPosted()
  87                         && $this->getUser()->matchEditToken( $request->getVal( 'wpEditToken' ) );
  88
  89                 // target page
  90                 if ( $this->mSubmitted ) {
  91                         $this->mTargetObj = Title::newFromURL( $this->mTarget );
  92                         $this->mDestObj = Title::newFromURL( $this->mDest );
  93                 } else {
  94                         $this->mTargetObj = null;
  95                         $this->mDestObj = null;
  96                 }
  97                 $this->preCacheMessages();
  98         }
  99
 100         /**
 101          * As we use the same small set of messages in various methods and that
 102          * they are called often, we call them once and save them in $this->message
 103          */
 104         function preCacheMessages() {
 105                 // Precache various messages
 106                 if ( !isset( $this->message ) ) {
 107                         $this->message['last'] = $this->msg( 'last' )->escaped();
 108                 }
 109         }
 110
 111         public function execute( $par ) {
 112                 $this->checkPermissions();
 113                 $this->checkReadOnly();
 114
 115                 $this->loadRequestParams();
 116
 117                 $this->setHeaders();
 118                 $this->outputHeader();
 119
 120                 if ( $this->mTargetID && $this->mDestID && $this->mAction == 'submit' && $this->mMerge ) {
 121                         $this->merge();
 122
 123                         return;
 124                 }
 125
 126                 if ( !$this->mSubmitted ) {
 127                         $this->showMergeForm();
 128
 129                         return;
 130                 }
 131
 132                 $errors = array();
 133                 if ( !$this->mTargetObj instanceof Title ) {
 134                         $errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();
 135                 } elseif ( !$this->mTargetObj->exists() ) {
 136                         $errors[] = $this->msg( 'mergehistory-no-source',
 137                                 wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )
 138                         )->parseAsBlock();
 139                 }
 140
 141                 if ( !$this->mDestObj instanceof Title ) {
 142                         $errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();
 143                 } elseif ( !$this->mDestObj->exists() ) {
 144                         $errors[] = $this->msg( 'mergehistory-no-destination',
 145                                 wfEscapeWikiText( $this->mDestObj->getPrefixedText() )
 146                         )->parseAsBlock();
 147                 }
 148
 149                 if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {
 150                         $errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();
 151                 }
 152
 153                 if ( count( $errors ) ) {
 154                         $this->showMergeForm();
 155                         $this->getOutput()->addHTML( implode( "\n", $errors ) );
 156                 } else {
 157                         $this->showHistory();
 158                 }
 159         }
 160
 161         function showMergeForm() {
 162                 $this->getOutput()->addWikiMsg( 'mergehistory-header' );
 163
 164                 $this->getOutput()->addHTML(
 165                         Xml::openElement( 'form', array(
 166                                 'method' => 'get',
 167                                 'action' => wfScript() ) ) .
 168                                 '<fieldset>' .
 169                                 Xml::element( 'legend', array(),
 170                                         $this->msg( 'mergehistory-box' )->text() ) .
 171                                 Html::hidden( 'title', $this->getPageTitle()->getPrefixedDBkey() ) .
 172                                 Html::hidden( 'submitted', '1' ) .
 173                                 Html::hidden( 'mergepoint', $this->mTimestamp ) .
 174                                 Xml::openElement( 'table' ) .
 175                                 '<tr>
 176                                 <td>' . Xml::label( $this->msg( 'mergehistory-from' )->text(), 'target' ) . '</td>
 177                                 <td>' . Xml::input( 'target', 30, $this->mTarget, array( 'id' => 'target' ) ) . '</td>
 178                         </tr><tr>
 179                                 <td>' . Xml::label( $this->msg( 'mergehistory-into' )->text(), 'dest' ) . '</td>
 180                                 <td>' . Xml::input( 'dest', 30, $this->mDest, array( 'id' => 'dest' ) ) . '</td>
 181                         </tr><tr><td>' .
 182                                 Xml::submitButton( $this->msg( 'mergehistory-go' )->text() ) .
 183                                 '</td></tr>' .
 184                                 Xml::closeElement( 'table' ) .
 185                                 '</fieldset>' .
 186                                 '</form>'
 187                 );
 188         }
 189
 190         private function showHistory() {
 191                 $this->showMergeForm();
 192
 193                 # List all stored revisions
 194                 $revisions = new MergeHistoryPager(
 195                         $this, array(), $this->mTargetObj, $this->mDestObj
 196                 );
 197                 $haveRevisions = $revisions && $revisions->getNumRows() > 0;
 198
 199                 $out = $this->getOutput();
 200                 $titleObj = $this->getPageTitle();
 201                 $action = $titleObj->getLocalURL( array( 'action' => 'submit' ) );
 202                 # Start the form here
 203                 $top = Xml::openElement(
 204                         'form',
 205                         array(
 206                                 'method' => 'post',
 207                                 'action' => $action,
 208                                 'id' => 'merge'
 209                         )
 210                 );
 211                 $out->addHTML( $top );
 212
 213                 if ( $haveRevisions ) {
 214                         # Format the user-visible controls (comment field, submission button)
 215                         # in a nice little table
 216                         $table =
 217                                 Xml::openElement( 'fieldset' ) .
 218                                         $this->msg( 'mergehistory-merge', $this->mTargetObj->getPrefixedText(),
 219                                                 $this->mDestObj->getPrefixedText() )->parse() .
 220                                         Xml::openElement( 'table', array( 'id' => 'mw-mergehistory-table' ) ) .
 221                                         '<tr>
 222                                                 <td class="mw-label">' .
 223                                         Xml::label( $this->msg( 'mergehistory-reason' )->text(), 'wpComment' ) .
 224                                         '</td>
 225                                         <td class="mw-input">' .
 226                                         Xml::input( 'wpComment', 50, $this->mComment, array( 'id' => 'wpComment' ) ) .
 227                                         '</td>
 228                                         </tr>
 229                                         <tr>
 230                                                 <td>&#160;</td>
 231                                                 <td class="mw-submit">' .
 232                                         Xml::submitButton(
 233                                                 $this->msg( 'mergehistory-submit' )->text(),
 234                                                 array( 'name' => 'merge', 'id' => 'mw-merge-submit' )
 235                                         ) .
 236                                         '</td>
 237                                         </tr>' .
 238                                         Xml::closeElement( 'table' ) .
 239                                         Xml::closeElement( 'fieldset' );
 240
 241                         $out->addHTML( $table );
 242                 }
 243
 244                 $out->addHTML(
 245                         '<h2 id="mw-mergehistory">' .
 246                                 $this->msg( 'mergehistory-list' )->escaped() . "</h2>\n"
 247                 );
 248
 249                 if ( $haveRevisions ) {
 250                         $out->addHTML( $revisions->getNavigationBar() );
 251                         $out->addHTML( '<ul>' );
 252                         $out->addHTML( $revisions->getBody() );
 253                         $out->addHTML( '</ul>' );
 254                         $out->addHTML( $revisions->getNavigationBar() );
 255                 } else {
 256                         $out->addWikiMsg( 'mergehistory-empty' );
 257                 }
 258
 259                 # Show relevant lines from the merge log:
 260                 $mergeLogPage = new LogPage( 'merge' );
 261                 $out->addHTML( '<h2>' . $mergeLogPage->getName()->escaped() . "</h2>\n" );
 262                 LogEventsList::showLogExtract( $out, 'merge', $this->mTargetObj );
 263
 264                 # When we submit, go by page ID to avoid some nasty but unlikely collisions.
 265                 # Such would happen if a page was renamed after the form loaded, but before submit
 266                 $misc = Html::hidden( 'targetID', $this->mTargetObj->getArticleID() );
 267                 $misc .= Html::hidden( 'destID', $this->mDestObj->getArticleID() );
 268                 $misc .= Html::hidden( 'target', $this->mTarget );
 269                 $misc .= Html::hidden( 'dest', $this->mDest );
 270                 $misc .= Html::hidden( 'wpEditToken', $this->getUser()->getEditToken() );
 271                 $misc .= Xml::closeElement( 'form' );
 272                 $out->addHTML( $misc );
 273
 274                 return true;
 275         }
 276
 277         function formatRevisionRow( $row ) {
 278                 $rev = new Revision( $row );
 279
 280                 $stxt = '';
 281                 $last = $this->message['last'];
 282
 283                 $ts = wfTimestamp( TS_MW, $row->rev_timestamp );
 284                 $checkBox = Xml::radio( 'mergepoint', $ts, ( $this->mTimestamp === $ts ) );
 285
 286                 $user = $this->getUser();
 287
 288                 $pageLink = Linker::linkKnown(
 289                         $rev->getTitle(),
 290                         htmlspecialchars( $this->getLanguage()->userTimeAndDate( $ts, $user ) ),
 291                         array(),
 292                         array( 'oldid' => $rev->getId() )
 293                 );
 294                 if ( $rev->isDeleted( Revision::DELETED_TEXT ) ) {
 295                         $pageLink = '<span class="history-deleted">' . $pageLink . '</span>';
 296                 }
 297
 298                 # Last link
 299                 if ( !$rev->userCan( Revision::DELETED_TEXT, $user ) ) {
 300                         $last = $this->message['last'];
 301                 } elseif ( isset( $this->prevId[$row->rev_id] ) ) {
 302                         $last = Linker::linkKnown(
 303                                 $rev->getTitle(),
 304                                 $this->message['last'],
 305                                 array(),
 306                                 array(
 307                                         'diff' => $row->rev_id,
 308                                         'oldid' => $this->prevId[$row->rev_id]
 309                                 )
 310                         );
 311                 }
 312
 313                 $userLink = Linker::revUserTools( $rev );
 314
 315                 $size = $row->rev_len;
 316                 if ( !is_null( $size ) ) {
 317                         $stxt = Linker::formatRevisionSize( $size );
 318                 }
 319                 $comment = Linker::revComment( $rev );
 320
 321                 return Html::rawElement( 'li', array(),
 322                         $this->msg( 'mergehistory-revisionrow' )
 323                                 ->rawParams( $checkBox, $last, $pageLink, $userLink, $stxt, $comment )->escaped() );
 324         }
 325
 326         /**
 327          * Actually attempt the history move
 328          *
 329          * @todo if all versions of page A are moved to B and then a user
 330          * tries to do a reverse-merge via the "unmerge" log link, then page
 331          * A will still be a redirect (as it was after the original merge),
 332          * though it will have the old revisions back from before (as expected).
 333          * The user may have to "undo" the redirect manually to finish the "unmerge".
 334          * Maybe this should delete redirects at the target page of merges?
 335          *
 336          * @return bool Success
 337          */
 338         function merge() {
 339                 # Get the titles directly from the IDs, in case the target page params
 340                 # were spoofed. The queries are done based on the IDs, so it's best to
 341                 # keep it consistent...
 342                 $targetTitle = Title::newFromID( $this->mTargetID );
 343                 $destTitle = Title::newFromID( $this->mDestID );
 344                 if ( is_null( $targetTitle ) || is_null( $destTitle ) ) {
 345                         return false; // validate these
 346                 }
 347                 if ( $targetTitle->getArticleID() == $destTitle->getArticleID() ) {
 348                         return false;
 349                 }
 350                 # Verify that this timestamp is valid
 351                 # Must be older than the destination page
 352                 $dbw = wfGetDB( DB_MASTER );
 353                 # Get timestamp into DB format
 354                 $this->mTimestamp = $this->mTimestamp ? $dbw->timestamp( $this->mTimestamp ) : '';
 355                 # Max timestamp should be min of destination page
 356                 $maxtimestamp = $dbw->selectField(
 357                         'revision',
 358                         'MIN(rev_timestamp)',
 359                         array( 'rev_page' => $this->mDestID ),
 360                         __METHOD__
 361                 );
 362                 # Destination page must exist with revisions
 363                 if ( !$maxtimestamp ) {
 364                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 365
 366                         return false;
 367                 }
 368                 # Get the latest timestamp of the source
 369                 $lasttimestamp = $dbw->selectField(
 370                         array( 'page', 'revision' ),
 371                         'rev_timestamp',
 372                         array( 'page_id' => $this->mTargetID, 'page_latest = rev_id' ),
 373                         __METHOD__
 374                 );
 375                 # $this->mTimestamp must be older than $maxtimestamp
 376                 if ( $this->mTimestamp >= $maxtimestamp ) {
 377                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 378
 379                         return false;
 380                 }
 381                 # Get the timestamp pivot condition
 382                 if ( $this->mTimestamp ) {
 383                         $timewhere = "rev_timestamp <= {$this->mTimestamp}";
 384                         $timestampLimit = wfTimestamp( TS_MW, $this->mTimestamp );
 385                 } else {
 386                         $timewhere = "rev_timestamp <= {$maxtimestamp}";
 387                         $timestampLimit = wfTimestamp( TS_MW, $lasttimestamp );
 388                 }
 389                 # Check that there are not too many revisions to move
 390                 $limit = 5000; // avoid too much slave lag
 391                 $count = $dbw->selectRowCount( 'revision', '1',
 392                         array( 'rev_page' => $this->mTargetID, $timewhere ),
 393                         __METHOD__,
 394                         array( 'LIMIT' => $limit + 1 )
 395                 );
 396                 if ( $count > $limit ) {
 397                         $this->getOutput()->addWikiMsg( 'mergehistory-fail-toobig' );
 398
 399                         return false;
 400                 }
 401                 # Do the moving...
 402                 $dbw->update(
 403                         'revision',
 404                         array( 'rev_page' => $this->mDestID ),
 405                         array( 'rev_page' => $this->mTargetID, $timewhere ),
 406                         __METHOD__
 407                 );
 408
 409                 $count = $dbw->affectedRows();
 410                 # Make the source page a redirect if no revisions are left
 411                 $haveRevisions = $dbw->selectField(
 412                         'revision',
 413                         'rev_timestamp',
 414                         array( 'rev_page' => $this->mTargetID ),
 415                         __METHOD__,
 416                         array( 'FOR UPDATE' )
 417                 );
 418                 if ( !$haveRevisions ) {
 419                         if ( $this->mComment ) {
 420                                 $comment = $this->msg(
 421                                         'mergehistory-comment',
 422                                         $targetTitle->getPrefixedText(),
 423                                         $destTitle->getPrefixedText(),
 424                                         $this->mComment
 425                                 )->inContentLanguage()->text();
 426                         } else {
 427                                 $comment = $this->msg(
 428                                         'mergehistory-autocomment',
 429                                         $targetTitle->getPrefixedText(),
 430                                         $destTitle->getPrefixedText()
 431                                 )->inContentLanguage()->text();
 432                         }
 433
 434                         $contentHandler = ContentHandler::getForTitle( $targetTitle );
 435                         $redirectContent = $contentHandler->makeRedirectContent( $destTitle );
 436
 437                         if ( $redirectContent ) {
 438                                 $redirectPage = WikiPage::factory( $targetTitle );
 439                                 $redirectRevision = new Revision( array(
 440                                         'title' => $targetTitle,
 441                                         'page' => $this->mTargetID,
 442                                         'comment' => $comment,
 443                                         'content' => $redirectContent ) );
 444                                 $redirectRevision->insertOn( $dbw );
 445                                 $redirectPage->updateRevisionOn( $dbw, $redirectRevision );
 446
 447                                 # Now, we record the link from the redirect to the new title.
 448                                 # It should have no other outgoing links...
 449                                 $dbw->delete( 'pagelinks', array( 'pl_from' => $this->mDestID ), __METHOD__ );
 450                                 $dbw->insert( 'pagelinks',
 451                                         array(
 452                                                 'pl_from' => $this->mDestID,
 453                                                 'pl_from_namespace' => $destTitle->getNamespace(),
 454                                                 'pl_namespace' => $destTitle->getNamespace(),
 455                                                 'pl_title' => $destTitle->getDBkey() ),
 456                                         __METHOD__
 457                                 );
 458                         } else {
 459                                 // would be nice to show a warning if we couldn't create a redirect
 460                         }
 461                 } else {
 462                         $targetTitle->invalidateCache(); // update histories
 463                 }
 464                 $destTitle->invalidateCache(); // update histories
 465                 # Check if this did anything
 466                 if ( !$count ) {
 467                         $this->getOutput()->addWikiMsg( 'mergehistory-fail' );
 468
 469                         return false;
 470                 }
 471                 # Update our logs
 472                 $log = new LogPage( 'merge' );
 473                 $log->addEntry(
 474                         'merge', $targetTitle, $this->mComment,
 475                         array( $destTitle->getPrefixedText(), $timestampLimit ), $this->getUser()
 476                 );
 477
 478                 # @todo message should use redirect=no
 479                 $this->getOutput()->addWikiMsg( 'mergehistory-success',
 480                         $targetTitle->getPrefixedText(), $destTitle->getPrefixedText(), $count );
 481
 482                 wfRunHooks( 'ArticleMergeComplete', array( $targetTitle, $destTitle ) );
 483
 484                 return true;
 485         }
 486
 487         protected function getGroupName() {
 488                 return 'pagetools';
 489         }
 490 }
 491
 492 class MergeHistoryPager extends ReverseChronologicalPager {
 493         /** @var IContextSource */
 494         public $mForm;
 495
 496         /** @var array */
 497         public $mConds;
 498
 499         function __construct( $form, $conds, $source, $dest ) {
 500                 $this->mForm = $form;
 501                 $this->mConds = $conds;
 502                 $this->title = $source;
 503                 $this->articleID = $source->getArticleID();
 504
 505                 $dbr = wfGetDB( DB_SLAVE );
 506                 $maxtimestamp = $dbr->selectField(
 507                         'revision',
 508                         'MIN(rev_timestamp)',
 509                         array( 'rev_page' => $dest->getArticleID() ),
 510                         __METHOD__
 511                 );
 512                 $this->maxTimestamp = $maxtimestamp;
 513
 514                 parent::__construct( $form->getContext() );
 515         }
 516
 517         function getStartBody() {
 518                 wfProfileIn( __METHOD__ );
 519                 # Do a link batch query
 520                 $this->mResult->seek( 0 );
 521                 $batch = new LinkBatch();
 522                 # Give some pointers to make (last) links
 523                 $this->mForm->prevId = array();
 524                 foreach ( $this->mResult as $row ) {
 525                         $batch->addObj( Title::makeTitleSafe( NS_USER, $row->user_name ) );
 526                         $batch->addObj( Title::makeTitleSafe( NS_USER_TALK, $row->user_name ) );
 527
 528                         $rev_id = isset( $rev_id ) ? $rev_id : $row->rev_id;
 529                         if ( $rev_id > $row->rev_id ) {
 530                                 $this->mForm->prevId[$rev_id] = $row->rev_id;
 531                         } elseif ( $rev_id < $row->rev_id ) {
 532                                 $this->mForm->prevId[$row->rev_id] = $rev_id;
 533                         }
 534
 535                         $rev_id = $row->rev_id;
 536                 }
 537
 538                 $batch->execute();
 539                 $this->mResult->seek( 0 );
 540
 541                 wfProfileOut( __METHOD__ );
 542
 543                 return '';
 544         }
 545
 546         function formatRow( $row ) {
 547                 return $this->mForm->formatRevisionRow( $row );
 548         }
 549
 550         function getQueryInfo() {
 551                 $conds = $this->mConds;
 552                 $conds['rev_page'] = $this->articleID;
 553                 $conds[] = "rev_timestamp < " . $this->mDb->addQuotes( $this->maxTimestamp );
 554
 555                 return array(
 556                         'tables' => array( 'revision', 'page', 'user' ),
 557                         'fields' => array_merge( Revision::selectFields(), Revision::selectUserFields() ),
 558                         'conds' => $conds,
 559                         'join_conds' => array(
 560                                 'page' => Revision::pageJoinCond(),
 561                                 'user' => Revision::userJoinCond() )
 562                 );
 563         }
 564
 565         function getIndexField() {
 566                 return 'rev_timestamp';
 567         }
 568 }